diff --git a/apps/bff/Dockerfile b/apps/bff/Dockerfile
index 8a7e499c..65f8c0a2 100644
--- a/apps/bff/Dockerfile
+++ b/apps/bff/Dockerfile
@@ -106,7 +106,7 @@ COPY --from=builder /app/apps/bff/prisma ./apps/bff/prisma
 
 # Generate Prisma client in production environment
 WORKDIR /app/apps/bff
-RUN pnpm dlx prisma generate
+RUN pnpm dlx prisma@6.14.0 generate
 
 # Strip build toolchain to shrink image
 RUN apk del --no-cache python3 make g++ pkgconfig && rm -rf /root/.cache /var/cache/apk/*
diff --git a/apps/bff/src/app/bootstrap.ts b/apps/bff/src/app/bootstrap.ts
index 68dcc9ff..cc969fec 100644
--- a/apps/bff/src/app/bootstrap.ts
+++ b/apps/bff/src/app/bootstrap.ts
@@ -17,9 +17,7 @@ declare global {
 }
 /* eslint-enable @typescript-eslint/no-namespace */
 
-import { GlobalExceptionFilter } from "../core/http/http-exception.filter";
-import { AuthErrorFilter } from "../core/http/auth-error.filter";
-import { SecureErrorMapperService } from "../core/security/services/secure-error-mapper.service";
+import { UnifiedExceptionFilter } from "../core/http/exception.filter";
 
 import { AppModule } from "../app.module";
 
@@ -116,11 +114,8 @@ export async function bootstrap(): Promise<INestApplication> {
     maxAge: 86400, // 24 hours
   });
 
-  // Global exception filters
-  app.useGlobalFilters(
-    new AuthErrorFilter(app.get(Logger)), // Handle auth errors first
-    new GlobalExceptionFilter(app.get(Logger), app.get(SecureErrorMapperService)) // Handle all other errors
-  );
+  // Global exception filter - single unified filter for all errors
+  app.useGlobalFilters(new UnifiedExceptionFilter(app.get(Logger), app.get(ConfigService)));
 
   // Global authentication guard will be registered via APP_GUARD provider in AuthModule
 
diff --git a/apps/bff/src/core/http/auth-error.filter.ts b/apps/bff/src/core/http/auth-error.filter.ts
deleted file mode 100644
index fe78bd93..00000000
--- a/apps/bff/src/core/http/auth-error.filter.ts
+++ /dev/null
@@ -1,175 +0,0 @@
-import {
-  ExceptionFilter,
-  Catch,
-  ArgumentsHost,
-  UnauthorizedException,
-  ForbiddenException,
-  BadRequestException,
-  ConflictException,
-  HttpStatus,
-} from "@nestjs/common";
-import type { Request, Response } from "express";
-import { Logger } from "nestjs-pino";
-
-/**
- * Standard error response matching domain apiErrorResponseSchema
- */
-interface StandardErrorResponse {
-  success: false;
-  error: {
-    code: string;
-    message: string;
-    details?: Record<string, unknown>;
-  };
-}
-
-@Catch(UnauthorizedException, ForbiddenException, BadRequestException, ConflictException)
-export class AuthErrorFilter implements ExceptionFilter {
-  constructor(private readonly logger: Logger) {}
-
-  catch(
-    exception: UnauthorizedException | ForbiddenException | BadRequestException | ConflictException,
-    host: ArgumentsHost
-  ) {
-    const ctx = host.switchToHttp();
-    const response = ctx.getResponse<Response>();
-    const request = ctx.getRequest<Request>();
-
-    const status = exception.getStatus() as HttpStatus;
-    const responsePayload = exception.getResponse();
-    const payloadMessage =
-      typeof responsePayload === "string"
-        ? responsePayload
-        : Array.isArray((responsePayload as { message?: unknown })?.message)
-          ? (responsePayload as { message: unknown[] }).message.find(
-              (value): value is string => typeof value === "string"
-            )
-          : (responsePayload as { message?: unknown })?.message;
-    const exceptionMessage = typeof exception.message === "string" ? exception.message : undefined;
-    const messageText =
-      payloadMessage && typeof payloadMessage === "string"
-        ? payloadMessage
-        : (exceptionMessage ?? "Authentication error");
-
-    // Map specific auth errors to user-friendly messages
-    const userMessage = this.getUserFriendlyMessage(messageText, status);
-    const errorCode = this.getErrorCode(messageText, status);
-
-    // Log the error (without sensitive information)
-    const userAgentHeader = request.headers["user-agent"];
-    const userAgent =
-      typeof userAgentHeader === "string"
-        ? userAgentHeader
-        : Array.isArray(userAgentHeader)
-          ? userAgentHeader[0]
-          : undefined;
-    this.logger.warn("Authentication error", {
-      path: request.url,
-      method: request.method,
-      errorCode,
-      userAgent,
-      ip: request.ip,
-    });
-
-    const errorResponse: StandardErrorResponse = {
-      success: false as const,
-      error: {
-        code: errorCode,
-        message: userMessage,
-        details: {
-          timestamp: new Date().toISOString(),
-          path: request.url,
-          statusCode: status,
-        },
-      },
-    };
-
-    response.status(status).json(errorResponse);
-  }
-
-  private getUserFriendlyMessage(message: string, status: HttpStatus): string {
-    // Production-safe error messages that don't expose sensitive information
-    if (status === HttpStatus.UNAUTHORIZED) {
-      if (
-        message.includes("Invalid credentials") ||
-        message.includes("Invalid email or password")
-      ) {
-        return "Invalid email or password. Please try again.";
-      }
-      if (message.includes("Token has been revoked") || message.includes("Invalid refresh token")) {
-        return "Your session has expired. Please log in again.";
-      }
-      if (message.includes("Account is locked")) {
-        return "Your account has been temporarily locked due to multiple failed login attempts. Please try again later.";
-      }
-      if (message.includes("Unable to verify credentials")) {
-        return "Unable to verify credentials. Please try again later.";
-      }
-      if (message.includes("Unable to verify account")) {
-        return "Unable to verify account. Please try again later.";
-      }
-      return "Authentication required. Please log in to continue.";
-    }
-
-    if (status === HttpStatus.FORBIDDEN) {
-      if (message.includes("Admin access required")) {
-        return "You do not have permission to access this resource.";
-      }
-      return "Access denied. You do not have permission to perform this action.";
-    }
-
-    if (status === HttpStatus.BAD_REQUEST) {
-      if (message.includes("Salesforce account not found")) {
-        return "Customer account not found. Please contact support.";
-      }
-      if (message.includes("Unable to verify customer information")) {
-        return "Unable to verify customer information. Please contact support.";
-      }
-      return "Invalid request. Please check your input and try again.";
-    }
-
-    if (status === HttpStatus.CONFLICT) {
-      if (message.includes("already linked")) {
-        return "This billing account is already linked. Please sign in.";
-      }
-      if (message.includes("already exists")) {
-        return "An account with this email already exists. Please sign in.";
-      }
-      return "Conflict detected. Please try again.";
-    }
-
-    return "Authentication error. Please try again.";
-  }
-
-  private getErrorCode(message: string, status: HttpStatus): string {
-    if (status === HttpStatus.UNAUTHORIZED) {
-      if (message.includes("Invalid credentials") || message.includes("Invalid email or password"))
-        return "INVALID_CREDENTIALS";
-      if (message.includes("Token has been revoked")) return "TOKEN_REVOKED";
-      if (message.includes("Invalid refresh token")) return "INVALID_REFRESH_TOKEN";
-      if (message.includes("Account is locked")) return "ACCOUNT_LOCKED";
-      if (message.includes("Unable to verify credentials")) return "SERVICE_UNAVAILABLE";
-      if (message.includes("Unable to verify account")) return "SERVICE_UNAVAILABLE";
-      return "UNAUTHORIZED";
-    }
-
-    if (status === HttpStatus.FORBIDDEN) {
-      if (message.includes("Admin access required")) return "ADMIN_REQUIRED";
-      return "FORBIDDEN";
-    }
-
-    if (status === HttpStatus.BAD_REQUEST) {
-      if (message.includes("Salesforce account not found")) return "CUSTOMER_NOT_FOUND";
-      if (message.includes("Unable to verify customer information")) return "SERVICE_UNAVAILABLE";
-      return "INVALID_REQUEST";
-    }
-
-    if (status === HttpStatus.CONFLICT) {
-      if (message.includes("already linked")) return "ACCOUNT_ALREADY_LINKED";
-      if (message.includes("already exists")) return "ACCOUNT_EXISTS";
-      return "CONFLICT";
-    }
-
-    return "AUTH_ERROR";
-  }
-}
diff --git a/apps/bff/src/core/http/exception.filter.ts b/apps/bff/src/core/http/exception.filter.ts
new file mode 100644
index 00000000..f5cc6161
--- /dev/null
+++ b/apps/bff/src/core/http/exception.filter.ts
@@ -0,0 +1,304 @@
+/**
+ * Unified Exception Filter
+ *
+ * Single exception filter that handles all HTTP exceptions consistently.
+ * Uses the shared error codes and messages from the domain package.
+ */
+
+import {
+  ExceptionFilter,
+  Catch,
+  ArgumentsHost,
+  HttpException,
+  HttpStatus,
+  Inject,
+} from "@nestjs/common";
+import type { Request, Response } from "express";
+import { Logger } from "nestjs-pino";
+import { ConfigService } from "@nestjs/config";
+import {
+  ErrorCode,
+  ErrorMessages,
+  ErrorMetadata,
+  matchErrorPattern,
+  type ErrorCodeType,
+  type ApiError,
+} from "@customer-portal/domain/common";
+
+/**
+ * Request context for error logging
+ */
+interface ErrorContext {
+  requestId: string;
+  userId?: string;
+  method: string;
+  path: string;
+  userAgent?: string;
+  ip?: string;
+}
+
+/**
+ * Unified exception filter for all HTTP errors.
+ * Provides consistent error responses and secure logging.
+ */
+@Catch()
+export class UnifiedExceptionFilter implements ExceptionFilter {
+  private readonly isDevelopment: boolean;
+
+  constructor(
+    @Inject(Logger) private readonly logger: Logger,
+    private readonly configService: ConfigService
+  ) {
+    this.isDevelopment = this.configService.get("NODE_ENV") !== "production";
+  }
+
+  catch(exception: unknown, host: ArgumentsHost): void {
+    const ctx = host.switchToHttp();
+    const response = ctx.getResponse<Response>();
+    const request = ctx.getRequest<Request & { user?: { id?: string }; requestId?: string }>();
+
+    // Build error context for logging
+    const errorContext = this.buildErrorContext(request);
+
+    // Extract status code and error details
+    const { status, errorCode, originalMessage } = this.extractErrorDetails(exception);
+
+    // Get user-friendly message (with dev details if in development)
+    const userMessage = this.getUserMessage(errorCode, originalMessage);
+
+    // Log the error
+    this.logError(errorCode, originalMessage, status, errorContext, exception);
+
+    // Build and send response
+    const errorResponse = this.buildErrorResponse(errorCode, userMessage, status, errorContext);
+    response.status(status).json(errorResponse);
+  }
+
+  /**
+   * Extract error details from exception
+   */
+  private extractErrorDetails(exception: unknown): {
+    status: number;
+    errorCode: ErrorCodeType;
+    originalMessage: string;
+  } {
+    let status = HttpStatus.INTERNAL_SERVER_ERROR;
+    let originalMessage = "An unexpected error occurred";
+
+    if (exception instanceof HttpException) {
+      status = exception.getStatus();
+      originalMessage = this.extractExceptionMessage(exception);
+    } else if (exception instanceof Error) {
+      originalMessage = exception.message;
+    }
+
+    // Map to error code
+    const errorCode = this.mapToErrorCode(originalMessage, status);
+
+    return { status, errorCode, originalMessage };
+  }
+
+  /**
+   * Extract message from HttpException
+   */
+  private extractExceptionMessage(exception: HttpException): string {
+    const response = exception.getResponse();
+
+    if (typeof response === "string") {
+      return response;
+    }
+
+    if (typeof response === "object" && response !== null) {
+      const responseObj = response as Record<string, unknown>;
+
+      // Handle NestJS validation errors (array of messages)
+      if (Array.isArray(responseObj.message)) {
+        const firstMessage = responseObj.message.find(
+          (m): m is string => typeof m === "string"
+        );
+        if (firstMessage) return firstMessage;
+      }
+
+      // Handle standard message field
+      if (typeof responseObj.message === "string") {
+        return responseObj.message;
+      }
+
+      // Handle error field
+      if (typeof responseObj.error === "string") {
+        return responseObj.error;
+      }
+    }
+
+    return exception.message;
+  }
+
+  /**
+   * Map error message and status to error code
+   */
+  private mapToErrorCode(message: string, status: number): ErrorCodeType {
+    // First, try pattern matching on the message
+    const patternCode = matchErrorPattern(message);
+    if (patternCode !== ErrorCode.UNKNOWN) {
+      return patternCode;
+    }
+
+    // Fall back to status code mapping
+    switch (status) {
+      case HttpStatus.UNAUTHORIZED:
+        return ErrorCode.SESSION_EXPIRED;
+      case HttpStatus.FORBIDDEN:
+        return ErrorCode.FORBIDDEN;
+      case HttpStatus.NOT_FOUND:
+        return ErrorCode.NOT_FOUND;
+      case HttpStatus.CONFLICT:
+        return ErrorCode.ACCOUNT_EXISTS;
+      case HttpStatus.BAD_REQUEST:
+        return ErrorCode.VALIDATION_FAILED;
+      case HttpStatus.TOO_MANY_REQUESTS:
+        return ErrorCode.RATE_LIMITED;
+      case HttpStatus.SERVICE_UNAVAILABLE:
+        return ErrorCode.SERVICE_UNAVAILABLE;
+      default:
+        return status >= 500 ? ErrorCode.INTERNAL_ERROR : ErrorCode.UNKNOWN;
+    }
+  }
+
+  /**
+   * Get user-friendly message, with dev details in development mode
+   */
+  private getUserMessage(errorCode: ErrorCodeType, originalMessage: string): string {
+    const userMessage = ErrorMessages[errorCode] ?? ErrorMessages[ErrorCode.UNKNOWN];
+
+    if (this.isDevelopment && originalMessage !== userMessage) {
+      // In dev mode, append original message for debugging
+      const sanitized = this.sanitizeForDev(originalMessage);
+      if (sanitized && sanitized !== userMessage) {
+        return `${userMessage} (Dev: ${sanitized})`;
+      }
+    }
+
+    return userMessage;
+  }
+
+  /**
+   * Sanitize message for development display
+   */
+  private sanitizeForDev(message: string): string {
+    return message
+      .replace(/password[=:]\s*[^\s]+/gi, "password=[HIDDEN]")
+      .replace(/secret[=:]\s*[^\s]+/gi, "secret=[HIDDEN]")
+      .replace(/token[=:]\s*[^\s]+/gi, "token=[HIDDEN]")
+      .replace(/key[=:]\s*[^\s]+/gi, "key=[HIDDEN]")
+      .substring(0, 200); // Limit length
+  }
+
+  /**
+   * Build error context from request
+   */
+  private buildErrorContext(
+    request: Request & { user?: { id?: string }; requestId?: string }
+  ): ErrorContext {
+    const userAgentHeader = request.headers["user-agent"];
+
+    return {
+      requestId: request.requestId ?? this.generateRequestId(),
+      userId: request.user?.id,
+      method: request.method,
+      path: request.url,
+      userAgent:
+        typeof userAgentHeader === "string"
+          ? userAgentHeader
+          : Array.isArray(userAgentHeader)
+            ? userAgentHeader[0]
+            : undefined,
+      ip: request.ip,
+    };
+  }
+
+  /**
+   * Log error with appropriate level based on metadata
+   */
+  private logError(
+    errorCode: ErrorCodeType,
+    originalMessage: string,
+    status: number,
+    context: ErrorContext,
+    exception: unknown
+  ): void {
+    const metadata = ErrorMetadata[errorCode] ?? ErrorMetadata[ErrorCode.UNKNOWN];
+
+    const logData = {
+      errorCode,
+      category: metadata.category,
+      severity: metadata.severity,
+      statusCode: status,
+      originalMessage: this.sanitizeForLogging(originalMessage),
+      ...context,
+      stack: exception instanceof Error ? exception.stack : undefined,
+    };
+
+    // Log based on severity
+    switch (metadata.logLevel) {
+      case "error":
+        this.logger.error(`HTTP ${status} Error [${errorCode}]`, logData);
+        break;
+      case "warn":
+        this.logger.warn(`HTTP ${status} Warning [${errorCode}]`, logData);
+        break;
+      case "info":
+        this.logger.log(`HTTP ${status} Info [${errorCode}]`, logData);
+        break;
+      case "debug":
+        this.logger.debug(`HTTP ${status} Debug [${errorCode}]`, logData);
+        break;
+    }
+  }
+
+  /**
+   * Sanitize message for logging (remove sensitive info)
+   */
+  private sanitizeForLogging(message: string): string {
+    return message
+      .replace(/password[=:]\s*[^\s]+/gi, "password=[REDACTED]")
+      .replace(/secret[=:]\s*[^\s]+/gi, "secret=[REDACTED]")
+      .replace(/token[=:]\s*[^\s]+/gi, "token=[REDACTED]")
+      .replace(/\b[A-Za-z0-9]{32,}\b/g, "[TOKEN]")
+      .replace(/\b(?:\d{1,3}\.){3}\d{1,3}\b/g, "[IP]");
+  }
+
+  /**
+   * Build standard error response
+   */
+  private buildErrorResponse(
+    errorCode: ErrorCodeType,
+    message: string,
+    status: number,
+    context: ErrorContext
+  ): ApiError {
+    const metadata = ErrorMetadata[errorCode] ?? ErrorMetadata[ErrorCode.UNKNOWN];
+
+    return {
+      success: false,
+      error: {
+        code: errorCode,
+        message,
+        details: {
+          statusCode: status,
+          category: metadata.category,
+          timestamp: new Date().toISOString(),
+          path: context.path,
+          requestId: context.requestId,
+        },
+      },
+    };
+  }
+
+  /**
+   * Generate unique request ID
+   */
+  private generateRequestId(): string {
+    return `req_${Date.now()}_${Math.random().toString(36).substring(2, 9)}`;
+  }
+}
+
diff --git a/apps/bff/src/core/http/http-exception.filter.ts b/apps/bff/src/core/http/http-exception.filter.ts
deleted file mode 100644
index 45e1ced7..00000000
--- a/apps/bff/src/core/http/http-exception.filter.ts
+++ /dev/null
@@ -1,102 +0,0 @@
-import {
-  ExceptionFilter,
-  Catch,
-  ArgumentsHost,
-  HttpException,
-  HttpStatus,
-  Inject,
-} from "@nestjs/common";
-import type { Request, Response } from "express";
-import { Logger } from "nestjs-pino";
-import { SecureErrorMapperService } from "../security/services/secure-error-mapper.service";
-
-@Catch()
-export class GlobalExceptionFilter implements ExceptionFilter {
-  constructor(
-    @Inject(Logger) private readonly logger: Logger,
-    private readonly secureErrorMapper: SecureErrorMapperService
-  ) {}
-
-  catch(exception: unknown, host: ArgumentsHost): void {
-    const ctx = host.switchToHttp();
-    const response = ctx.getResponse<Response>();
-    const request = ctx.getRequest<Request & { user?: { id?: string }; requestId?: string }>();
-
-    // Create error context for secure mapping
-    const errorContext = {
-      userId: request.user?.id,
-      requestId: request.requestId || this.generateRequestId(),
-      userAgent: request.get("user-agent"),
-      ip: request.ip,
-      url: request.url,
-      method: request.method,
-    };
-
-    let status: number;
-    let originalError: unknown = exception;
-
-    // Determine HTTP status
-    if (exception instanceof HttpException) {
-      status = exception.getStatus();
-
-      // Extract the actual error from HttpException response
-      const exceptionResponse = exception.getResponse();
-      if (typeof exceptionResponse === "object" && exceptionResponse !== null) {
-        const errorResponse = exceptionResponse as { message?: string; error?: string };
-        originalError = errorResponse.message || exception.message;
-      } else {
-        originalError =
-          typeof exceptionResponse === "string" ? exceptionResponse : exception.message;
-      }
-    } else {
-      status = HttpStatus.INTERNAL_SERVER_ERROR;
-      originalError = exception;
-    }
-
-    // Use secure error mapper to get safe public message and log securely
-    const errorClassification = this.secureErrorMapper.mapError(originalError, errorContext);
-    const publicMessage = this.secureErrorMapper.getPublicMessage(originalError, errorContext);
-
-    // Log the error securely (this handles sensitive data filtering)
-    this.secureErrorMapper.logSecureError(originalError, errorContext, {
-      httpStatus: status,
-      exceptionType: exception instanceof Error ? exception.constructor.name : "Unknown",
-    });
-
-    // Create secure error response matching domain apiErrorResponseSchema
-    const errorResponse = {
-      success: false as const,
-      error: {
-        code: errorClassification.mapping.code,
-        message: publicMessage,
-        details: {
-          statusCode: status,
-          category: errorClassification.category.toUpperCase(),
-          timestamp: new Date().toISOString(),
-          path: request.url,
-          requestId: errorContext.requestId,
-        },
-      },
-    };
-
-    // Additional logging for monitoring (without sensitive data)
-    this.logger.error(`HTTP ${status} Error [${errorClassification.mapping.code}]`, {
-      statusCode: status,
-      method: request.method,
-      url: request.url,
-      userAgent: request.get("user-agent"),
-      ip: request.ip,
-      errorCode: errorClassification.mapping.code,
-      category: errorClassification.category,
-      severity: errorClassification.severity,
-      requestId: errorContext.requestId,
-      userId: errorContext.userId,
-    });
-
-    response.status(status).json(errorResponse);
-  }
-
-  private generateRequestId(): string {
-    return `req_${Date.now()}_${Math.random().toString(36).substring(2, 9)}`;
-  }
-}
diff --git a/apps/bff/src/core/security/services/secure-error-mapper.service.ts b/apps/bff/src/core/security/services/secure-error-mapper.service.ts
index d04ae1d9..67a7918c 100644
--- a/apps/bff/src/core/security/services/secure-error-mapper.service.ts
+++ b/apps/bff/src/core/security/services/secure-error-mapper.service.ts
@@ -205,6 +205,14 @@ export class SecureErrorMapperService {
           logLevel: "info",
         },
       ],
+      [
+        "ENDPOINT_NOT_FOUND",
+        {
+          code: "VAL_003",
+          publicMessage: "The requested resource was not found",
+          logLevel: "info",
+        },
+      ],
 
       // Business Logic Errors
       [
@@ -357,6 +365,16 @@ export class SecureErrorMapperService {
         },
       },
 
+      // HTTP/Routing patterns
+      {
+        pattern: /^Cannot\s+(GET|POST|PUT|PATCH|DELETE|OPTIONS|HEAD)\s+/i,
+        mapping: {
+          code: "VAL_003",
+          publicMessage: "The requested resource was not found",
+          logLevel: "info",
+        },
+      },
+
       // Validation patterns
       {
         pattern: /invalid|required|missing|validation|format/i,
diff --git a/apps/bff/src/integrations/salesforce/salesforce.module.ts b/apps/bff/src/integrations/salesforce/salesforce.module.ts
index 7e7b5226..e00edd61 100644
--- a/apps/bff/src/integrations/salesforce/salesforce.module.ts
+++ b/apps/bff/src/integrations/salesforce/salesforce.module.ts
@@ -5,6 +5,7 @@ import { SalesforceService } from "./salesforce.service";
 import { SalesforceConnection } from "./services/salesforce-connection.service";
 import { SalesforceAccountService } from "./services/salesforce-account.service";
 import { SalesforceOrderService } from "./services/salesforce-order.service";
+import { SalesforceCaseService } from "./services/salesforce-case.service";
 import { OrderFieldConfigModule } from "@bff/modules/orders/config/order-field-config.module";
 import { SalesforceReadThrottleGuard } from "./guards/salesforce-read-throttle.guard";
 import { SalesforceWriteThrottleGuard } from "./guards/salesforce-write-throttle.guard";
@@ -15,6 +16,7 @@ import { SalesforceWriteThrottleGuard } from "./guards/salesforce-write-throttle
     SalesforceConnection,
     SalesforceAccountService,
     SalesforceOrderService,
+    SalesforceCaseService,
     SalesforceService,
     SalesforceReadThrottleGuard,
     SalesforceWriteThrottleGuard,
@@ -24,6 +26,7 @@ import { SalesforceWriteThrottleGuard } from "./guards/salesforce-write-throttle
     SalesforceService,
     SalesforceConnection,
     SalesforceOrderService,
+    SalesforceCaseService,
     SalesforceReadThrottleGuard,
     SalesforceWriteThrottleGuard,
   ],
diff --git a/apps/bff/src/integrations/salesforce/services/salesforce-case.service.ts b/apps/bff/src/integrations/salesforce/services/salesforce-case.service.ts
new file mode 100644
index 00000000..d80d2462
--- /dev/null
+++ b/apps/bff/src/integrations/salesforce/services/salesforce-case.service.ts
@@ -0,0 +1,209 @@
+/**
+ * Salesforce Case Integration Service
+ *
+ * Encapsulates all Salesforce Case operations for the portal.
+ * - Queries cases filtered by Origin = 'Portal Website'
+ * - Creates cases with portal-specific defaults
+ * - Validates account ownership for security
+ *
+ * Uses domain types and mappers from @customer-portal/domain/support
+ */
+
+import { Injectable, Inject } from "@nestjs/common";
+import { Logger } from "nestjs-pino";
+import { SalesforceConnection } from "./salesforce-connection.service";
+import { assertSalesforceId } from "../utils/soql.util";
+import { getErrorMessage } from "@bff/core/utils/error.util";
+import type { SalesforceResponse } from "@customer-portal/domain/common";
+import {
+  type SupportCase,
+  type SalesforceCaseRecord,
+  type CreateCaseRequest,
+  PORTAL_CASE_ORIGIN,
+  SALESFORCE_CASE_ORIGIN,
+  SALESFORCE_CASE_STATUS,
+  SALESFORCE_CASE_PRIORITY,
+  Providers,
+} from "@customer-portal/domain/support";
+
+// Import the reverse mapping function
+const { toSalesforcePriority } = Providers.Salesforce;
+
+/**
+ * Parameters for creating a case in Salesforce
+ * Extends domain CreateCaseRequest with infrastructure-specific fields
+ */
+export interface CreateCaseParams extends CreateCaseRequest {
+  /** Salesforce Account ID */
+  accountId: string;
+  /** Optional Salesforce Contact ID */
+  contactId?: string;
+}
+
+@Injectable()
+export class SalesforceCaseService {
+  constructor(
+    private readonly sf: SalesforceConnection,
+    @Inject(Logger) private readonly logger: Logger
+  ) {}
+
+  /**
+   * Get all cases for an account filtered by Portal Website origin
+   */
+  async getCasesForAccount(accountId: string): Promise<SupportCase[]> {
+    const safeAccountId = assertSalesforceId(accountId, "accountId");
+    this.logger.debug({ accountId: safeAccountId }, "Fetching portal cases for account");
+
+    const soql = Providers.Salesforce.buildCasesForAccountQuery(
+      safeAccountId,
+      SALESFORCE_CASE_ORIGIN.PORTAL_WEBSITE
+    );
+
+    try {
+      const result = (await this.sf.query(soql, {
+        label: "support:listCasesForAccount",
+      })) as SalesforceResponse<SalesforceCaseRecord>;
+
+      const cases = result.records || [];
+
+      this.logger.debug(
+        { accountId: safeAccountId, caseCount: cases.length },
+        "Portal cases retrieved for account"
+      );
+
+      return Providers.Salesforce.transformSalesforceCasesToSupportCases(cases);
+    } catch (error: unknown) {
+      this.logger.error("Failed to fetch cases for account", {
+        error: getErrorMessage(error),
+        accountId: safeAccountId,
+      });
+      throw new Error("Failed to fetch support cases");
+    }
+  }
+
+  /**
+   * Get a single case by ID with account ownership validation
+   */
+  async getCaseById(caseId: string, accountId: string): Promise<SupportCase | null> {
+    const safeCaseId = assertSalesforceId(caseId, "caseId");
+    const safeAccountId = assertSalesforceId(accountId, "accountId");
+
+    this.logger.debug({ caseId: safeCaseId, accountId: safeAccountId }, "Fetching case by ID");
+
+    const soql = Providers.Salesforce.buildCaseByIdQuery(
+      safeCaseId,
+      safeAccountId,
+      SALESFORCE_CASE_ORIGIN.PORTAL_WEBSITE
+    );
+
+    try {
+      const result = (await this.sf.query(soql, {
+        label: "support:getCaseById",
+      })) as SalesforceResponse<SalesforceCaseRecord>;
+
+      const record = result.records?.[0];
+
+      if (!record) {
+        this.logger.debug({ caseId: safeCaseId }, "Case not found or access denied");
+        return null;
+      }
+
+      return Providers.Salesforce.transformSalesforceCaseToSupportCase(record);
+    } catch (error: unknown) {
+      this.logger.error("Failed to fetch case by ID", {
+        error: getErrorMessage(error),
+        caseId: safeCaseId,
+      });
+      throw new Error("Failed to fetch support case");
+    }
+  }
+
+  /**
+   * Create a new case with Portal Website origin
+   */
+  async createCase(params: CreateCaseParams): Promise<{ id: string; caseNumber: string }> {
+    const safeAccountId = assertSalesforceId(params.accountId, "accountId");
+    const safeContactId = params.contactId
+      ? assertSalesforceId(params.contactId, "contactId")
+      : undefined;
+
+    this.logger.log(
+      { accountId: safeAccountId, subject: params.subject },
+      "Creating portal support case"
+    );
+
+    // Build case payload with portal defaults
+    // Convert portal display values to Salesforce API values
+    const sfPriority = params.priority
+      ? toSalesforcePriority(params.priority)
+      : SALESFORCE_CASE_PRIORITY.MEDIUM;
+
+    const casePayload: Record<string, unknown> = {
+      Origin: SALESFORCE_CASE_ORIGIN.PORTAL_WEBSITE,
+      Status: SALESFORCE_CASE_STATUS.NEW,
+      Priority: sfPriority,
+      Subject: params.subject.trim(),
+      Description: params.description.trim(),
+    };
+
+    // Set ContactId if available - Salesforce will auto-populate AccountId from Contact
+    // If no ContactId, we must set AccountId directly (requires FLS write permission)
+    if (safeContactId) {
+      casePayload.ContactId = safeContactId;
+    } else {
+      // Only set AccountId when no ContactId is available
+      // Note: This requires AccountId field-level security write permission
+      casePayload.AccountId = safeAccountId;
+    }
+
+    // Note: Category maps to Salesforce Type field
+    // Only set if Type picklist is configured in Salesforce
+    // Currently skipped as Type picklist values are unknown
+
+    try {
+      const created = (await this.sf.sobject("Case").create(casePayload)) as { id?: string };
+
+      if (!created.id) {
+        throw new Error("Salesforce did not return a case ID");
+      }
+
+      // Fetch the created case to get the CaseNumber
+      const createdCase = await this.getCaseByIdInternal(created.id);
+      const caseNumber = createdCase?.CaseNumber ?? created.id;
+
+      this.logger.log(
+        { caseId: created.id, caseNumber },
+        "Portal support case created successfully"
+      );
+
+      return { id: created.id, caseNumber };
+    } catch (error: unknown) {
+      this.logger.error("Failed to create support case", {
+        error: getErrorMessage(error),
+        accountId: safeAccountId,
+      });
+      throw new Error("Failed to create support case");
+    }
+  }
+
+  /**
+   * Internal method to fetch case without account validation (for post-create lookup)
+   */
+  private async getCaseByIdInternal(caseId: string): Promise<SalesforceCaseRecord | null> {
+    const safeCaseId = assertSalesforceId(caseId, "caseId");
+
+    const fields = Providers.Salesforce.buildCaseSelectFields().join(", ");
+    const soql = `
+      SELECT ${fields}
+      FROM Case
+      WHERE Id = '${safeCaseId}'
+      LIMIT 1
+    `;
+
+    const result = (await this.sf.query(soql, {
+      label: "support:getCaseByIdInternal",
+    })) as SalesforceResponse<SalesforceCaseRecord>;
+
+    return result.records?.[0] ?? null;
+  }
+}
diff --git a/apps/bff/src/modules/catalog/services/catalog-cache.service.ts b/apps/bff/src/modules/catalog/services/catalog-cache.service.ts
index 587e8ea8..2877842b 100644
--- a/apps/bff/src/modules/catalog/services/catalog-cache.service.ts
+++ b/apps/bff/src/modules/catalog/services/catalog-cache.service.ts
@@ -17,6 +17,12 @@ export interface CatalogCacheOptions<T> {
   ) => CacheDependencies | Promise<CacheDependencies | undefined> | undefined;
 }
 
+interface LegacyCatalogCachePayload<T> {
+  value: T;
+  __catalogCache?: boolean;
+  dependencies?: CacheDependencies;
+}
+
 /**
  * Catalog cache service
  * 
@@ -188,13 +194,12 @@ export class CatalogCacheService {
     const allowNull = options?.allowNull ?? false;
     
     // Check Redis cache first
-    const cached = await this.cache.get<T>(key);
+    const cached = await this.cache.get<T | LegacyCatalogCachePayload<T>>(key);
 
     if (cached !== null) {
-      if (allowNull || cached !== null) {
-        this.metrics[bucket].hits++;
-        return cached;
-      }
+      const normalized = await this.normalizeCachedValue(key, cached, ttlSeconds);
+      this.metrics[bucket].hits++;
+      return normalized;
     }
 
     // Check for in-flight request (prevents thundering herd)
@@ -243,6 +248,43 @@ export class CatalogCacheService {
     return fetchPromise;
   }
 
+  private async normalizeCachedValue<T>(
+    key: string,
+    cached: T | LegacyCatalogCachePayload<T>,
+    ttlSeconds: number | null
+  ): Promise<T> {
+    if (this.isLegacyCatalogCachePayload<T>(cached)) {
+      const ttlArg = ttlSeconds === null ? undefined : ttlSeconds;
+      const normalizedValue = cached.value;
+
+      if (ttlArg === undefined) {
+        await this.cache.set(key, normalizedValue);
+      } else {
+        await this.cache.set(key, normalizedValue, ttlArg);
+      }
+
+      if (cached.dependencies) {
+        await this.storeDependencies(key, cached.dependencies);
+        await this.linkDependencies(key, cached.dependencies);
+      }
+
+      return normalizedValue;
+    }
+
+    return cached;
+  }
+
+  private isLegacyCatalogCachePayload<T>(
+    payload: unknown
+  ): payload is LegacyCatalogCachePayload<T> {
+    if (!payload || typeof payload !== "object") {
+      return false;
+    }
+
+    const record = payload as Record<string, unknown>;
+    return record.__catalogCache === true && Object.prototype.hasOwnProperty.call(record, "value");
+  }
+
   /**
    * Invalidate catalog entries by product IDs
    * Returns true if any entries were invalidated, false if no matches found
diff --git a/apps/bff/src/modules/support/support.controller.ts b/apps/bff/src/modules/support/support.controller.ts
index bdd07cd3..1c57bde7 100644
--- a/apps/bff/src/modules/support/support.controller.ts
+++ b/apps/bff/src/modules/support/support.controller.ts
@@ -1,10 +1,14 @@
-import { Controller, Get, Query, Request } from "@nestjs/common";
+import { Controller, Get, Post, Query, Param, Body, Request } from "@nestjs/common";
 import { SupportService } from "./support.service";
 import { ZodValidationPipe } from "@customer-portal/validation/nestjs";
 import {
   supportCaseFilterSchema,
+  createCaseRequestSchema,
   type SupportCaseFilter,
   type SupportCaseList,
+  type SupportCase,
+  type CreateCaseRequest,
+  type CreateCaseResponse,
 } from "@customer-portal/domain/support";
 import type { RequestWithUser } from "@bff/modules/auth/auth.types";
 
@@ -14,11 +18,27 @@ export class SupportController {
 
   @Get("cases")
   async listCases(
-    @Request() _req: RequestWithUser,
+    @Request() req: RequestWithUser,
     @Query(new ZodValidationPipe(supportCaseFilterSchema))
     filters: SupportCaseFilter
   ): Promise<SupportCaseList> {
-    void _req;
-    return this.supportService.listCases(filters);
+    return this.supportService.listCases(req.user.id, filters);
+  }
+
+  @Get("cases/:id")
+  async getCase(
+    @Request() req: RequestWithUser,
+    @Param("id") caseId: string
+  ): Promise<SupportCase> {
+    return this.supportService.getCase(req.user.id, caseId);
+  }
+
+  @Post("cases")
+  async createCase(
+    @Request() req: RequestWithUser,
+    @Body(new ZodValidationPipe(createCaseRequestSchema))
+    body: CreateCaseRequest
+  ): Promise<CreateCaseResponse> {
+    return this.supportService.createCase(req.user.id, body);
   }
 }
diff --git a/apps/bff/src/modules/support/support.module.ts b/apps/bff/src/modules/support/support.module.ts
index f5e78d4a..29c6eb58 100644
--- a/apps/bff/src/modules/support/support.module.ts
+++ b/apps/bff/src/modules/support/support.module.ts
@@ -1,8 +1,11 @@
 import { Module } from "@nestjs/common";
 import { SupportController } from "./support.controller";
 import { SupportService } from "./support.service";
+import { SalesforceModule } from "@bff/integrations/salesforce/salesforce.module";
+import { MappingsModule } from "@bff/modules/id-mappings/mappings.module";
 
 @Module({
+  imports: [SalesforceModule, MappingsModule],
   controllers: [SupportController],
   providers: [SupportService],
   exports: [SupportService],
diff --git a/apps/bff/src/modules/support/support.service.ts b/apps/bff/src/modules/support/support.service.ts
index efb44918..babc127f 100644
--- a/apps/bff/src/modules/support/support.service.ts
+++ b/apps/bff/src/modules/support/support.service.ts
@@ -1,110 +1,158 @@
-import { Injectable } from "@nestjs/common";
+import { Injectable, Inject, NotFoundException, ForbiddenException } from "@nestjs/common";
+import { Logger } from "nestjs-pino";
 import {
-  SUPPORT_CASE_CATEGORY,
   SUPPORT_CASE_PRIORITY,
   SUPPORT_CASE_STATUS,
-  supportCaseFilterSchema,
-  supportCaseListSchema,
   type SupportCase,
   type SupportCaseFilter,
   type SupportCaseList,
-  type SupportCasePriority,
-  type SupportCaseStatus,
+  type CreateCaseRequest,
+  type CreateCaseResponse,
 } from "@customer-portal/domain/support";
+import { SalesforceCaseService } from "@bff/integrations/salesforce/services/salesforce-case.service";
+import { MappingsService } from "@bff/modules/id-mappings/mappings.service";
+import { getErrorMessage } from "@bff/core/utils/error.util";
 
-const OPEN_STATUSES: SupportCaseStatus[] = [
-  SUPPORT_CASE_STATUS.OPEN,
+/**
+ * Status values that indicate an open/active case
+ * (Display values after mapping from Salesforce Japanese API names)
+ */
+const OPEN_STATUSES: string[] = [
+  SUPPORT_CASE_STATUS.NEW,
   SUPPORT_CASE_STATUS.IN_PROGRESS,
-  SUPPORT_CASE_STATUS.WAITING_ON_CUSTOMER,
+  SUPPORT_CASE_STATUS.AWAITING_APPROVAL,
 ];
 
-const RESOLVED_STATUSES: SupportCaseStatus[] = [
+/**
+ * Status values that indicate a resolved/closed case
+ * (Display values after mapping from Salesforce Japanese API names)
+ */
+const RESOLVED_STATUSES: string[] = [
+  SUPPORT_CASE_STATUS.VPN_PENDING,
+  SUPPORT_CASE_STATUS.PENDING,
   SUPPORT_CASE_STATUS.RESOLVED,
   SUPPORT_CASE_STATUS.CLOSED,
 ];
 
-const HIGH_PRIORITIES: SupportCasePriority[] = [
-  SUPPORT_CASE_PRIORITY.HIGH,
-  SUPPORT_CASE_PRIORITY.CRITICAL,
-];
+/**
+ * Priority values that indicate high priority
+ */
+const HIGH_PRIORITIES: string[] = [SUPPORT_CASE_PRIORITY.HIGH];
 
 @Injectable()
 export class SupportService {
-  // Placeholder dataset until Salesforce integration is ready
-  private readonly cases: SupportCase[] = [
-    {
-      id: 12001,
-      subject: "VPS Performance Issues",
-      status: SUPPORT_CASE_STATUS.IN_PROGRESS,
-      priority: SUPPORT_CASE_PRIORITY.HIGH,
-      category: SUPPORT_CASE_CATEGORY.TECHNICAL,
-      createdAt: "2025-08-14T10:30:00Z",
-      updatedAt: "2025-08-15T14:20:00Z",
-      lastReply: "2025-08-15T14:20:00Z",
-      description: "Experiencing slow response times on VPS server, CPU usage appears high.",
-      assignedTo: "Technical Support Team",
-    },
-    {
-      id: 12002,
-      subject: "Billing Question - Invoice #12345",
-      status: SUPPORT_CASE_STATUS.WAITING_ON_CUSTOMER,
-      priority: SUPPORT_CASE_PRIORITY.MEDIUM,
-      category: SUPPORT_CASE_CATEGORY.BILLING,
-      createdAt: "2025-08-13T16:45:00Z",
-      updatedAt: "2025-08-14T09:30:00Z",
-      lastReply: "2025-08-14T09:30:00Z",
-      description: "Need clarification on charges in recent invoice.",
-      assignedTo: "Billing Department",
-    },
-    {
-      id: 12003,
-      subject: "SSL Certificate Installation",
-      status: SUPPORT_CASE_STATUS.RESOLVED,
-      priority: SUPPORT_CASE_PRIORITY.LOW,
-      category: SUPPORT_CASE_CATEGORY.TECHNICAL,
-      createdAt: "2025-08-12T08:15:00Z",
-      updatedAt: "2025-08-12T15:45:00Z",
-      lastReply: "2025-08-12T15:45:00Z",
-      description: "Request assistance with SSL certificate installation on shared hosting.",
-      assignedTo: "Technical Support Team",
-    },
-    {
-      id: 12004,
-      subject: "Feature Request: Control Panel Enhancement",
-      status: SUPPORT_CASE_STATUS.OPEN,
-      priority: SUPPORT_CASE_PRIORITY.LOW,
-      category: SUPPORT_CASE_CATEGORY.FEATURE_REQUEST,
-      createdAt: "2025-08-11T13:20:00Z",
-      updatedAt: "2025-08-11T13:20:00Z",
-      description: "Would like to see improved backup management in the control panel.",
-      assignedTo: "Development Team",
-    },
-    {
-      id: 12005,
-      subject: "Server Migration Assistance",
-      status: SUPPORT_CASE_STATUS.CLOSED,
-      priority: SUPPORT_CASE_PRIORITY.MEDIUM,
-      category: SUPPORT_CASE_CATEGORY.TECHNICAL,
-      createdAt: "2025-08-10T11:00:00Z",
-      updatedAt: "2025-08-11T17:30:00Z",
-      lastReply: "2025-08-11T17:30:00Z",
-      description: "Need help migrating website from old server to new VPS.",
-      assignedTo: "Migration Team",
-    },
-  ];
+  constructor(
+    private readonly caseService: SalesforceCaseService,
+    private readonly mappingsService: MappingsService,
+    @Inject(Logger) private readonly logger: Logger
+  ) {}
 
-  async listCases(rawFilters?: SupportCaseFilter): Promise<SupportCaseList> {
-    const filters = supportCaseFilterSchema.parse(rawFilters ?? {});
-    const filteredCases = this.applyFilters(this.cases, filters);
-    const result = {
-      cases: filteredCases,
-      summary: this.buildSummary(filteredCases),
-    };
-    return supportCaseListSchema.parse(result);
+  /**
+   * List cases for a user with optional filters
+   */
+  async listCases(userId: string, filters?: SupportCaseFilter): Promise<SupportCaseList> {
+    const accountId = await this.getAccountIdForUser(userId);
+
+    try {
+      // SalesforceCaseService now returns SupportCase[] directly using domain mappers
+      const cases = await this.caseService.getCasesForAccount(accountId);
+
+      const filteredCases = this.applyFilters(cases, filters);
+      const summary = this.buildSummary(filteredCases);
+
+      return { cases: filteredCases, summary };
+    } catch (error) {
+      this.logger.error("Failed to list support cases", {
+        userId,
+        error: getErrorMessage(error),
+      });
+      throw error;
+    }
   }
 
-  private applyFilters(cases: SupportCase[], filters: SupportCaseFilter): SupportCase[] {
+  /**
+   * Get a single case by ID
+   */
+  async getCase(userId: string, caseId: string): Promise<SupportCase> {
+    const accountId = await this.getAccountIdForUser(userId);
+
+    try {
+      // SalesforceCaseService now returns SupportCase directly using domain mappers
+      const supportCase = await this.caseService.getCaseById(caseId, accountId);
+
+      if (!supportCase) {
+        throw new NotFoundException("Support case not found");
+      }
+
+      return supportCase;
+    } catch (error) {
+      if (error instanceof NotFoundException) {
+        throw error;
+      }
+      this.logger.error("Failed to get support case", {
+        userId,
+        caseId,
+        error: getErrorMessage(error),
+      });
+      throw error;
+    }
+  }
+
+  /**
+   * Create a new support case
+   */
+  async createCase(userId: string, request: CreateCaseRequest): Promise<CreateCaseResponse> {
+    const accountId = await this.getAccountIdForUser(userId);
+
+    try {
+      const result = await this.caseService.createCase({
+        subject: request.subject,
+        description: request.description,
+        category: request.category,
+        priority: request.priority,
+        accountId,
+      });
+
+      this.logger.log("Support case created", {
+        userId,
+        caseId: result.id,
+        caseNumber: result.caseNumber,
+      });
+
+      return result;
+    } catch (error) {
+      this.logger.error("Failed to create support case", {
+        userId,
+        error: getErrorMessage(error),
+      });
+      throw error;
+    }
+  }
+
+  /**
+   * Get Salesforce account ID for a user
+   */
+  private async getAccountIdForUser(userId: string): Promise<string> {
+    const mapping = await this.mappingsService.findByUserId(userId);
+
+    if (!mapping?.sfAccountId) {
+      this.logger.warn("No Salesforce account mapping found for user", { userId });
+      throw new ForbiddenException("Account not linked to Salesforce");
+    }
+
+    return mapping.sfAccountId;
+  }
+
+  /**
+   * Apply filters to cases
+   */
+  private applyFilters(cases: SupportCase[], filters?: SupportCaseFilter): SupportCase[] {
+    if (!filters) {
+      return cases;
+    }
+
     const search = filters.search?.toLowerCase().trim();
+
     return cases.filter(supportCase => {
       if (filters.status && supportCase.status !== filters.status) {
         return false;
@@ -116,7 +164,8 @@ export class SupportService {
         return false;
       }
       if (search) {
-        const haystack = `${supportCase.subject} ${supportCase.description} ${supportCase.id}`.toLowerCase();
+        const haystack =
+          `${supportCase.subject} ${supportCase.description} ${supportCase.caseNumber}`.toLowerCase();
         if (!haystack.includes(search)) {
           return false;
         }
@@ -125,6 +174,9 @@ export class SupportService {
     });
   }
 
+  /**
+   * Build summary statistics for cases
+   */
   private buildSummary(cases: SupportCase[]): SupportCaseList["summary"] {
     const open = cases.filter(c => OPEN_STATUSES.includes(c.status)).length;
     const highPriority = cases.filter(c => HIGH_PRIORITIES.includes(c.priority)).length;
diff --git a/apps/portal/src/app/(authenticated)/support/cases/[id]/page.tsx b/apps/portal/src/app/(authenticated)/support/cases/[id]/page.tsx
new file mode 100644
index 00000000..0bcc3feb
--- /dev/null
+++ b/apps/portal/src/app/(authenticated)/support/cases/[id]/page.tsx
@@ -0,0 +1,11 @@
+import { SupportCaseDetailView } from "@/features/support";
+
+interface PageProps {
+  params: Promise<{ id: string }>;
+}
+
+export default async function SupportCaseDetailPage({ params }: PageProps) {
+  const { id } = await params;
+  return <SupportCaseDetailView caseId={id} />;
+}
+
diff --git a/apps/portal/src/app/(authenticated)/support/page.tsx b/apps/portal/src/app/(authenticated)/support/page.tsx
new file mode 100644
index 00000000..5148a44b
--- /dev/null
+++ b/apps/portal/src/app/(authenticated)/support/page.tsx
@@ -0,0 +1,12 @@
+import { SupportHomeView } from "@/features/support";
+import { AgentforceWidget } from "@/components";
+
+export default function SupportPage() {
+  return (
+    <>
+      <SupportHomeView />
+      <AgentforceWidget />
+    </>
+  );
+}
+
diff --git a/apps/portal/src/components/molecules/AsyncBlock/AsyncBlock.tsx b/apps/portal/src/components/molecules/AsyncBlock/AsyncBlock.tsx
index f6bba344..ad69802b 100644
--- a/apps/portal/src/components/molecules/AsyncBlock/AsyncBlock.tsx
+++ b/apps/portal/src/components/molecules/AsyncBlock/AsyncBlock.tsx
@@ -3,7 +3,7 @@
 import React from "react";
 import { Skeleton } from "@/components/atoms/loading-skeleton";
 import { ErrorState } from "@/components/atoms/error-state";
-import { toUserMessage } from "@/lib/utils";
+import { getErrorMessage } from "@/lib/utils";
 
 interface AsyncBlockProps {
   isLoading?: boolean;
@@ -59,7 +59,7 @@ export function AsyncBlock({
     return (
       <ErrorState
         title={"Unable to load"}
-        message={toUserMessage(error)}
+        message={getErrorMessage(error)}
         variant={variant === "page" ? "page" : variant === "inline" ? "inline" : "card"}
       />
     );
diff --git a/apps/portal/src/components/organisms/AgentforceWidget/AgentforceWidget.tsx b/apps/portal/src/components/organisms/AgentforceWidget/AgentforceWidget.tsx
new file mode 100644
index 00000000..b2d2d9a6
--- /dev/null
+++ b/apps/portal/src/components/organisms/AgentforceWidget/AgentforceWidget.tsx
@@ -0,0 +1,152 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { ChatBubbleLeftRightIcon, XMarkIcon } from "@heroicons/react/24/outline";
+
+/**
+ * Agentforce Widget Configuration
+ *
+ * These values should be set in environment variables:
+ * - NEXT_PUBLIC_SF_EMBEDDED_SERVICE_URL: The Salesforce Messaging for Web script URL
+ * - NEXT_PUBLIC_SF_EMBEDDED_SERVICE_DEPLOYMENT_ID: The deployment ID
+ * - NEXT_PUBLIC_SF_ORG_ID: Your Salesforce org ID
+ *
+ * To get these values:
+ * 1. Go to Salesforce Setup > Messaging > Embedded Service Deployments
+ * 2. Create or select a deployment
+ * 3. Copy the deployment code snippet
+ * 4. Extract the URL and deployment ID
+ */
+
+interface AgentforceWidgetProps {
+  /**
+   * Whether to show the floating chat button
+   * If false, the widget will only be triggered programmatically
+   */
+  showFloatingButton?: boolean;
+}
+
+declare global {
+  interface Window {
+    embeddedservice_bootstrap?: {
+      settings: {
+        language: string;
+      };
+      init: (
+        orgId: string,
+        deploymentName: string,
+        baseSiteURL: string,
+        options: {
+          scrt2URL: string;
+        }
+      ) => void;
+    };
+  }
+}
+
+export function AgentforceWidget({ showFloatingButton = true }: AgentforceWidgetProps) {
+  const [isLoaded, setIsLoaded] = useState(false);
+  const [isOpen, setIsOpen] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  // Configuration from environment variables
+  const scriptUrl = process.env.NEXT_PUBLIC_SF_EMBEDDED_SERVICE_URL;
+  const orgId = process.env.NEXT_PUBLIC_SF_ORG_ID;
+  const deploymentId = process.env.NEXT_PUBLIC_SF_EMBEDDED_SERVICE_DEPLOYMENT_ID;
+  const baseSiteUrl = process.env.NEXT_PUBLIC_SF_EMBEDDED_SERVICE_SITE_URL;
+  const scrt2Url = process.env.NEXT_PUBLIC_SF_EMBEDDED_SERVICE_SCRT2_URL;
+
+  useEffect(() => {
+    // Skip if not configured
+    if (!scriptUrl || !orgId || !deploymentId || !baseSiteUrl || !scrt2Url) {
+      setError("Agentforce widget is not configured. Please set the required environment variables.");
+      return;
+    }
+
+    // Skip if already loaded
+    if (window.embeddedservice_bootstrap) {
+      setIsLoaded(true);
+      return;
+    }
+
+    // Load the Salesforce Messaging for Web script
+    const script = document.createElement("script");
+    script.src = scriptUrl;
+    script.async = true;
+    script.onload = () => {
+      try {
+        if (window.embeddedservice_bootstrap) {
+          window.embeddedservice_bootstrap.settings.language = "en";
+          window.embeddedservice_bootstrap.init(
+            orgId,
+            deploymentId,
+            baseSiteUrl,
+            { scrt2URL: scrt2Url }
+          );
+          setIsLoaded(true);
+        }
+      } catch (err) {
+        setError("Failed to initialize Agentforce widget");
+        console.error("Agentforce init error:", err);
+      }
+    };
+    script.onerror = () => {
+      setError("Failed to load Agentforce widget script");
+    };
+
+    document.body.appendChild(script);
+
+    return () => {
+      // Cleanup is handled by Salesforce's script
+    };
+  }, [scriptUrl, orgId, deploymentId, baseSiteUrl, scrt2Url]);
+
+  // If not configured, show nothing or a placeholder
+  if (error) {
+    // In development, show the error; in production, fail silently
+    if (process.env.NODE_ENV === "development") {
+      return (
+        <div className="fixed bottom-4 right-4 max-w-xs bg-yellow-50 border border-yellow-200 rounded-lg p-3 shadow-lg z-50">
+          <p className="text-xs text-yellow-700">{error}</p>
+        </div>
+      );
+    }
+    return null;
+  }
+
+  // Show custom floating button only if the Salesforce widget hasn't loaded
+  // Once loaded, Salesforce's native button will appear
+  if (!isLoaded && showFloatingButton) {
+    return (
+      <div className="fixed bottom-4 right-4 z-50">
+        <button
+          onClick={() => setIsOpen(!isOpen)}
+          className="inline-flex items-center justify-center w-14 h-14 rounded-full bg-blue-600 text-white shadow-lg hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500"
+          aria-label={isOpen ? "Close chat" : "Open chat"}
+        >
+          {isOpen ? (
+            <XMarkIcon className="h-6 w-6" />
+          ) : (
+            <ChatBubbleLeftRightIcon className="h-6 w-6" />
+          )}
+        </button>
+
+        {isOpen && (
+          <div className="absolute bottom-16 right-0 w-80 bg-white rounded-lg shadow-xl border border-gray-200">
+            <div className="p-4 border-b border-gray-200 bg-blue-600 rounded-t-lg">
+              <h3 className="text-lg font-medium text-white">AI Assistant</h3>
+              <p className="text-sm text-blue-100">Loading...</p>
+            </div>
+            <div className="p-4 flex items-center justify-center h-32">
+              <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600"></div>
+            </div>
+          </div>
+        )}
+      </div>
+    );
+  }
+
+  // Once loaded, Salesforce handles the UI
+  return null;
+}
+
diff --git a/apps/portal/src/components/organisms/AgentforceWidget/index.ts b/apps/portal/src/components/organisms/AgentforceWidget/index.ts
new file mode 100644
index 00000000..55daca7a
--- /dev/null
+++ b/apps/portal/src/components/organisms/AgentforceWidget/index.ts
@@ -0,0 +1,2 @@
+export { AgentforceWidget } from "./AgentforceWidget";
+
diff --git a/apps/portal/src/components/organisms/AppShell/Header.tsx b/apps/portal/src/components/organisms/AppShell/Header.tsx
index 9373ffb9..47b539df 100644
--- a/apps/portal/src/components/organisms/AppShell/Header.tsx
+++ b/apps/portal/src/components/organisms/AppShell/Header.tsx
@@ -33,11 +33,11 @@ export const Header = memo(function Header({ onMenuClick, user, profileReady }:
 
         <div className="flex items-center gap-2">
           <Link
-            href="/support/kb"
+            href="/support"
             prefetch
             aria-label="Help"
             className="hidden sm:inline-flex p-2 rounded-lg text-gray-600 hover:text-gray-900 hover:bg-gray-100 transition-colors"
-            title="Help Center"
+            title="Support Center"
           >
             <QuestionMarkCircleIcon className="h-5 w-5" />
           </Link>
diff --git a/apps/portal/src/components/organisms/AppShell/navigation.ts b/apps/portal/src/components/organisms/AppShell/navigation.ts
index d7b6a3c7..a63a4f0c 100644
--- a/apps/portal/src/components/organisms/AppShell/navigation.ts
+++ b/apps/portal/src/components/organisms/AppShell/navigation.ts
@@ -48,7 +48,6 @@ export const baseNavigation: NavigationItem[] = [
     children: [
       { name: "Cases", href: "/support/cases" },
       { name: "New Case", href: "/support/new" },
-      { name: "Knowledge Base", href: "/support/kb" },
     ],
   },
   {
diff --git a/apps/portal/src/components/organisms/index.ts b/apps/portal/src/components/organisms/index.ts
index 54476fc6..d89ae25d 100644
--- a/apps/portal/src/components/organisms/index.ts
+++ b/apps/portal/src/components/organisms/index.ts
@@ -4,3 +4,4 @@
  */
 
 export { AppShell } from "./AppShell/AppShell";
+export { AgentforceWidget } from "./AgentforceWidget";
diff --git a/apps/portal/src/features/auth/components/LinkWhmcsForm/LinkWhmcsForm.tsx b/apps/portal/src/features/auth/components/LinkWhmcsForm/LinkWhmcsForm.tsx
index 12931c7a..b9e95dc1 100644
--- a/apps/portal/src/features/auth/components/LinkWhmcsForm/LinkWhmcsForm.tsx
+++ b/apps/portal/src/features/auth/components/LinkWhmcsForm/LinkWhmcsForm.tsx
@@ -1,16 +1,14 @@
+/**
+ * Link WHMCS Form - Account migration form using domain schema
+ */
+
 "use client";
 
 import { useCallback } from "react";
 import { Button, Input, ErrorMessage } from "@/components/atoms";
 import { FormField } from "@/components/molecules/FormField/FormField";
 import { useWhmcsLink } from "@/features/auth/hooks";
-import {
-  linkWhmcsRequestSchema,
-  type LinkWhmcsRequest,
-  type LinkWhmcsResponse,
-} from "@customer-portal/domain/auth";
-
-type LinkWhmcsFormData = LinkWhmcsRequest;
+import { linkWhmcsRequestSchema, type LinkWhmcsResponse } from "@customer-portal/domain/auth";
 import { useZodForm } from "@customer-portal/validation";
 
 interface LinkWhmcsFormProps {
@@ -21,80 +19,60 @@ interface LinkWhmcsFormProps {
 export function LinkWhmcsForm({ onTransferred, className = "" }: LinkWhmcsFormProps) {
   const { linkWhmcs, loading, error, clearError } = useWhmcsLink();
 
-  const handleLink = useCallback(
-    async (formData: LinkWhmcsFormData) => {
+  const form = useZodForm({
+    schema: linkWhmcsRequestSchema,
+    initialValues: { email: "", password: "" },
+    onSubmit: async data => {
       clearError();
-      const payload: LinkWhmcsRequest = {
-        email: formData.email,
-        password: formData.password,
-      };
-      const result = await linkWhmcs(payload);
+      const result = await linkWhmcs(data);
       onTransferred?.(result);
     },
-    [linkWhmcs, onTransferred, clearError]
-  );
-
-  const { values, errors, isSubmitting, setValue, handleSubmit } = useZodForm({
-    schema: linkWhmcsRequestSchema,
-    initialValues: {
-      email: "",
-      password: "",
-    },
-    onSubmit: handleLink,
   });
 
+  const isLoading = form.isSubmitting || loading;
+
   return (
-    <div className={`w-full max-w-md mx-auto ${className}`}>
-      <div className="bg-white shadow-sm rounded-lg border border-gray-200 p-6">
-        <div className="mb-6">
-          <h2 className="text-lg font-semibold text-gray-900 mb-2">Link Your WHMCS Account</h2>
-          <p className="text-sm text-gray-600">
-            Enter your existing WHMCS credentials to link your account and migrate your data.
-          </p>
-        </div>
+    <form onSubmit={e => void form.handleSubmit(e)} className={`space-y-5 ${className}`}>
+      <FormField label="Email Address" error={form.touched.email ? form.errors.email : undefined} required>
+        <Input
+          type="email"
+          value={form.values.email}
+          onChange={e => form.setValue("email", e.target.value)}
+          onBlur={() => form.setTouchedField("email")}
+          placeholder="you@example.com"
+          disabled={isLoading}
+          autoComplete="email"
+          autoFocus
+        />
+      </FormField>
 
-        <form onSubmit={event => void handleSubmit(event)} className="space-y-4">
-          <FormField label="Email Address" error={errors.email} required>
-            <Input
-              type="email"
-              value={values.email}
-              onChange={e => setValue("email", e.target.value)}
-              placeholder="Enter your WHMCS email"
-              disabled={isSubmitting || loading}
-              className="w-full"
-            />
-          </FormField>
+      <FormField label="Password" error={form.touched.password ? form.errors.password : undefined} required>
+        <Input
+          type="password"
+          value={form.values.password}
+          onChange={e => form.setValue("password", e.target.value)}
+          onBlur={() => form.setTouchedField("password")}
+          placeholder="Enter your legacy portal password"
+          disabled={isLoading}
+          autoComplete="current-password"
+        />
+      </FormField>
 
-          <FormField label="Password" error={errors.password} required>
-            <Input
-              type="password"
-              value={values.password}
-              onChange={e => setValue("password", e.target.value)}
-              placeholder="Enter your WHMCS password"
-              disabled={isSubmitting || loading}
-              className="w-full"
-            />
-          </FormField>
+      {error && <ErrorMessage className="text-center">{error}</ErrorMessage>}
 
-          {error && <ErrorMessage className="text-center">{error}</ErrorMessage>}
+      <Button
+        type="submit"
+        disabled={isLoading || !form.values.email || !form.values.password}
+        loading={isLoading}
+        loadingText="Verifying..."
+        className="w-full"
+      >
+        Transfer My Account
+      </Button>
 
-          <Button
-            type="submit"
-            disabled={isSubmitting || loading}
-            loading={isSubmitting || loading}
-            loadingText="Linking Account..."
-            className="w-full"
-          >
-            Link WHMCS Account
-          </Button>
-        </form>
-
-        <div className="mt-4 text-center">
-          <p className="text-xs text-gray-500">
-            Your credentials are used only to verify your identity and migrate your data securely.
-          </p>
-        </div>
-      </div>
-    </div>
+      <p className="text-xs text-gray-500 text-center">
+        Your credentials are encrypted and used only to verify your identity
+      </p>
+    </form>
   );
 }
diff --git a/apps/portal/src/features/auth/components/SetPasswordForm/SetPasswordForm.tsx b/apps/portal/src/features/auth/components/SetPasswordForm/SetPasswordForm.tsx
index 00a27a83..ca6d9326 100644
--- a/apps/portal/src/features/auth/components/SetPasswordForm/SetPasswordForm.tsx
+++ b/apps/portal/src/features/auth/components/SetPasswordForm/SetPasswordForm.tsx
@@ -1,6 +1,5 @@
 /**
- * Set Password Form Component
- * Form for setting password after WHMCS account linking - migrated to use Zod validation
+ * Set Password Form - Password creation after WHMCS migration
  */
 
 "use client";
@@ -11,148 +10,133 @@ import { Button, Input, ErrorMessage } from "@/components/atoms";
 import { FormField } from "@/components/molecules/FormField/FormField";
 import { useWhmcsLink } from "../../hooks/use-auth";
 import { useZodForm } from "@customer-portal/validation";
-import { setPasswordRequestSchema } from "@customer-portal/domain/auth";
+import {
+  setPasswordRequestSchema,
+  checkPasswordStrength,
+  getPasswordStrengthDisplay,
+} from "@customer-portal/domain/auth";
 import { z } from "zod";
 
+// Extend domain schema with confirmPassword
+const setPasswordFormSchema = setPasswordRequestSchema
+  .extend({ confirmPassword: z.string().min(1, "Please confirm your password") })
+  .refine(data => data.password === data.confirmPassword, {
+    message: "Passwords do not match",
+    path: ["confirmPassword"],
+  });
+
 interface SetPasswordFormProps {
   email?: string;
   onSuccess?: () => void;
   onError?: (error: string) => void;
-  showLoginLink?: boolean;
   className?: string;
 }
 
-export function SetPasswordForm({
-  email = "",
-  onSuccess,
-  onError,
-  showLoginLink = true,
-  className = "",
-}: SetPasswordFormProps) {
+export function SetPasswordForm({ email = "", onSuccess, onError, className = "" }: SetPasswordFormProps) {
   const { setPassword, loading, error, clearError } = useWhmcsLink();
 
-  /**
-   * Frontend form schema - extends domain setPasswordRequestSchema with confirmPassword
-   *
-   * Single source of truth: Domain layer defines validation rules
-   * Frontend only adds: confirmPassword field and password matching logic
-   */
-  const setPasswordFormSchema = setPasswordRequestSchema
-    .extend({
-      confirmPassword: z.string().min(1, "Please confirm your password"),
-    })
-    .superRefine((data, ctx) => {
-      if (data.password !== data.confirmPassword) {
-        ctx.addIssue({
-          code: z.ZodIssueCode.custom,
-          path: ["confirmPassword"],
-          message: "Passwords do not match",
-        });
-      }
-    });
-
-  type SetPasswordFormValues = z.infer<typeof setPasswordFormSchema>;
-
-  const form = useZodForm<SetPasswordFormValues>({
+  const form = useZodForm({
     schema: setPasswordFormSchema,
-    initialValues: {
-      email,
-      password: "",
-      confirmPassword: "",
-    },
-    onSubmit: async ({ confirmPassword: _ignore, ...data }) => {
-      void _ignore;
+    initialValues: { email, password: "", confirmPassword: "" },
+    onSubmit: async data => {
       clearError();
       try {
         await setPassword(data.email, data.password);
         onSuccess?.();
       } catch (err) {
-        const errorMessage = err instanceof Error ? err.message : "Failed to set password";
-        onError?.(errorMessage);
+        onError?.(err instanceof Error ? err.message : "Failed to set password");
         throw err;
       }
     },
   });
 
-  // Handle errors from auth hooks
+  const { requirements, strength, isValid } = checkPasswordStrength(form.values.password);
+  const { label, colorClass } = getPasswordStrengthDisplay(strength);
+  const passwordsMatch = form.values.password === form.values.confirmPassword;
+  const isLoading = loading || form.isSubmitting;
+  const isEmailProvided = Boolean(email);
+
   useEffect(() => {
-    if (error) {
-      onError?.(error);
-    }
+    if (error) onError?.(error);
   }, [error, onError]);
 
-  // Update email when prop changes
   useEffect(() => {
-    if (email && email !== form.values.email) {
-      form.setValue("email", email);
-    }
+    if (email && email !== form.values.email) form.setValue("email", email);
   }, [email, form]);
 
   return (
-    <div className={`space-y-6 ${className}`}>
-      <div className="text-center">
-        <h2 className="text-2xl font-bold text-gray-900">Set your password</h2>
-        <p className="mt-2 text-sm text-gray-600">
-          Create a password for your account to complete the setup.
-        </p>
-      </div>
+    <form onSubmit={e => void form.handleSubmit(e)} className={`space-y-5 ${className}`}>
+      <FormField label="Email Address" error={form.errors.email} required>
+        <Input
+          type="email"
+          value={form.values.email}
+          onChange={e => !isEmailProvided && form.setValue("email", e.target.value)}
+          disabled={isLoading || isEmailProvided}
+          readOnly={isEmailProvided}
+          className={isEmailProvided ? "bg-gray-50 text-gray-600" : ""}
+        />
+        {isEmailProvided && <p className="mt-1 text-xs text-gray-500">Verified during account transfer</p>}
+      </FormField>
 
-      <form onSubmit={event => void form.handleSubmit(event)} className="space-y-4">
-        <FormField label="Email address" error={form.errors.email} required>
-          <Input
-            type="email"
-            placeholder="Enter your email"
-            value={form.values.email}
-            onChange={e => form.setValue("email", e.target.value)}
-            onBlur={() => form.setTouched("email", true)}
-            disabled={loading || form.isSubmitting}
-            className={form.errors.email ? "border-red-300" : ""}
-          />
-        </FormField>
+      <FormField label="New Password" error={form.touched.password ? form.errors.password : undefined} required>
+        <Input
+          type="password"
+          value={form.values.password}
+          onChange={e => form.setValue("password", e.target.value)}
+          onBlur={() => form.setTouched("password", true)}
+          placeholder="Create a secure password"
+          disabled={isLoading}
+          autoComplete="new-password"
+          autoFocus
+        />
+      </FormField>
 
-        <FormField label="Password" error={form.errors.password} required>
-          <Input
-            type="password"
-            placeholder="Enter your password"
-            value={form.values.password}
-            onChange={e => form.setValue("password", e.target.value)}
-            onBlur={() => form.setTouched("password", true)}
-            disabled={loading || form.isSubmitting}
-            className={form.errors.password ? "border-red-300" : ""}
-          />
-        </FormField>
-
-        <FormField label="Confirm password" error={form.errors.confirmPassword} required>
-          <Input
-            type="password"
-            placeholder="Confirm your password"
-            value={form.values.confirmPassword}
-            onChange={e => form.setValue("confirmPassword", e.target.value)}
-            onBlur={() => form.setTouched("confirmPassword", true)}
-            disabled={loading || form.isSubmitting}
-            className={form.errors.confirmPassword ? "border-red-300" : ""}
-          />
-        </FormField>
-
-        {(error || form.errors._form) && <ErrorMessage>{form.errors._form || error}</ErrorMessage>}
-
-        <Button
-          type="submit"
-          className="w-full"
-          disabled={loading || form.isSubmitting || !form.isValid}
-          loading={loading || form.isSubmitting}
-        >
-          Set password
-        </Button>
-      </form>
-
-      {showLoginLink && (
-        <div className="text-center">
-          <Link href="/login" className="text-sm text-blue-600 hover:text-blue-500 font-medium">
-            Back to login
-          </Link>
+      {form.values.password && (
+        <div className="space-y-2">
+          <div className="flex items-center gap-2">
+            <div className="flex-1 h-2 bg-gray-200 rounded-full overflow-hidden">
+              <div className={`h-full transition-all ${colorClass}`} style={{ width: `${strength}%` }} />
+            </div>
+            <span className={`text-xs font-medium ${isValid ? "text-green-600" : "text-gray-500"}`}>{label}</span>
+          </div>
+          <div className="grid grid-cols-2 gap-1">
+            {requirements.map(r => (
+              <div key={r.key} className="flex items-center gap-1.5 text-xs">
+                <span className={r.met ? "text-green-500" : "text-gray-300"}>{r.met ? "✓" : "○"}</span>
+                <span className={r.met ? "text-green-700" : "text-gray-500"}>{r.label}</span>
+              </div>
+            ))}
+          </div>
         </div>
       )}
-    </div>
+
+      <FormField label="Confirm Password" error={form.touched.confirmPassword ? form.errors.confirmPassword : undefined} required>
+        <Input
+          type="password"
+          value={form.values.confirmPassword}
+          onChange={e => form.setValue("confirmPassword", e.target.value)}
+          onBlur={() => form.setTouched("confirmPassword", true)}
+          placeholder="Re-enter your password"
+          disabled={isLoading}
+          autoComplete="new-password"
+        />
+      </FormField>
+
+      {form.values.confirmPassword && (
+        <p className={`text-sm ${passwordsMatch ? "text-green-600" : "text-red-600"}`}>
+          {passwordsMatch ? "✓ Passwords match" : "✗ Passwords do not match"}
+        </p>
+      )}
+
+      {(error || form.errors._form) && <ErrorMessage>{form.errors._form || error}</ErrorMessage>}
+
+      <Button type="submit" className="w-full" disabled={isLoading || !form.isValid} loading={isLoading}>
+        Set Password & Continue
+      </Button>
+
+      <div className="text-center">
+        <Link href="/auth/login" className="text-sm text-blue-600 hover:text-blue-500">Back to login</Link>
+      </div>
+    </form>
   );
 }
diff --git a/apps/portal/src/features/auth/components/SignupForm/AccountStep.tsx b/apps/portal/src/features/auth/components/SignupForm/AccountStep.tsx
deleted file mode 100644
index ff66cbec..00000000
--- a/apps/portal/src/features/auth/components/SignupForm/AccountStep.tsx
+++ /dev/null
@@ -1,76 +0,0 @@
-/**
- * Account Step Component
- * Email and password fields for signup
- */
-
-"use client";
-
-import { FormField } from "@/components/molecules/FormField/FormField";
-
-interface AccountStepProps {
-  formData: {
-    email: string;
-    password: string;
-    confirmPassword: string;
-  };
-  errors: {
-    email?: string;
-    password?: string;
-    confirmPassword?: string;
-  };
-  onFieldChange: (field: string, value: string) => void;
-  onFieldBlur: (field: string) => void;
-  loading?: boolean;
-}
-
-export function AccountStep({
-  formData,
-  errors,
-  onFieldChange,
-  onFieldBlur,
-  loading = false,
-}: AccountStepProps) {
-  return (
-    <div className="space-y-4">
-      <FormField
-        label="Email Address"
-        error={errors.email}
-        required
-        type="email"
-        value={formData.email}
-        onChange={e => onFieldChange("email", e.target.value)}
-        onBlur={() => onFieldBlur("email")}
-        placeholder="Enter your email address"
-        disabled={loading}
-        autoComplete="email"
-        autoFocus
-      />
-
-      <FormField
-        label="Password"
-        error={errors.password}
-        required
-        type="password"
-        value={formData.password}
-        onChange={e => onFieldChange("password", e.target.value)}
-        onBlur={() => onFieldBlur("password")}
-        placeholder="Create a strong password"
-        disabled={loading}
-        autoComplete="new-password"
-      />
-
-      <FormField
-        label="Confirm Password"
-        error={errors.confirmPassword}
-        required
-        type="password"
-        value={formData.confirmPassword}
-        onChange={e => onFieldChange("confirmPassword", e.target.value)}
-        onBlur={() => onFieldBlur("confirmPassword")}
-        placeholder="Confirm your password"
-        disabled={loading}
-        autoComplete="new-password"
-      />
-    </div>
-  );
-}
diff --git a/apps/portal/src/features/auth/components/SignupForm/AddressStep.tsx b/apps/portal/src/features/auth/components/SignupForm/AddressStep.tsx
deleted file mode 100644
index ae1e459e..00000000
--- a/apps/portal/src/features/auth/components/SignupForm/AddressStep.tsx
+++ /dev/null
@@ -1,147 +0,0 @@
-/**
- * Address Step Component
- * Address information fields for signup using Zod validation
- */
-
-"use client";
-
-import { useCallback } from "react";
-import { Input } from "@/components/atoms";
-import { FormField } from "@/components/molecules/FormField/FormField";
-import type { FormErrors, FormTouched, UseZodFormReturn } from "@customer-portal/validation";
-import type { SignupFormValues } from "./SignupForm";
-import type { Address } from "@customer-portal/domain/customer";
-import { COUNTRY_OPTIONS } from "@/lib/constants/countries";
-
-interface AddressStepProps {
-  address: SignupFormValues["address"];
-  errors: FormErrors<SignupFormValues>;
-  touched: FormTouched<SignupFormValues>;
-  onAddressChange: (address: SignupFormValues["address"]) => void;
-  setTouchedField: UseZodFormReturn<SignupFormValues>["setTouchedField"];
-}
-
-export function AddressStep({
-  address,
-  errors,
-  touched,
-  onAddressChange,
-  setTouchedField,
-}: AddressStepProps) {
-  // Use domain Address type directly - no type helpers needed
-  const updateAddressField = useCallback(
-    (field: keyof Address, value: string) => {
-      onAddressChange({ ...(address ?? {}), [field]: value });
-    },
-    [address, onAddressChange]
-  );
-
-  const handleCountryChange = useCallback(
-    (code: string) => {
-      const normalized = code || "";
-      onAddressChange({
-        ...(address ?? {}),
-        country: normalized,
-        countryCode: normalized,
-      });
-    },
-    [address, onAddressChange]
-  );
-
-  const getFieldError = useCallback(
-    (field: keyof Address) => {
-      const fieldKey = `address.${field}`;
-      const isTouched = touched[fieldKey] ?? touched.address;
-
-      if (!isTouched) {
-        return undefined;
-      }
-
-      return errors[fieldKey] ?? errors[field] ?? errors.address;
-    },
-    [errors, touched]
-  );
-
-  const markTouched = useCallback(() => {
-    setTouchedField("address");
-  }, [setTouchedField]);
-
-  return (
-    <div className="space-y-6">
-      <FormField label="Street Address" error={getFieldError("address1")} required>
-        <Input
-          type="text"
-          value={address?.address1 || ""}
-          onChange={e => updateAddressField("address1", e.target.value)}
-          onBlur={markTouched}
-          placeholder="Enter your street address"
-          className="w-full"
-        />
-      </FormField>
-
-      <FormField label="Address Line 2 (Optional)" error={getFieldError("address2")}>
-        <Input
-          type="text"
-          value={address?.address2 || ""}
-          onChange={e => updateAddressField("address2", e.target.value)}
-          onBlur={markTouched}
-          placeholder="Apartment, suite, etc."
-          className="w-full"
-        />
-      </FormField>
-
-      <div className="grid grid-cols-1 gap-6 sm:grid-cols-2">
-        <FormField label="City" error={getFieldError("city")} required>
-          <Input
-            type="text"
-            value={address?.city || ""}
-            onChange={e => updateAddressField("city", e.target.value)}
-            onBlur={markTouched}
-            placeholder="Enter your city"
-            className="w-full"
-          />
-        </FormField>
-
-        <FormField label="State/Province" error={getFieldError("state")} required>
-          <Input
-            type="text"
-            value={address?.state || ""}
-            onChange={e => updateAddressField("state", e.target.value)}
-            onBlur={markTouched}
-            placeholder="Enter your state/province"
-            className="w-full"
-          />
-        </FormField>
-      </div>
-
-      <div className="grid grid-cols-1 gap-6 sm:grid-cols-2">
-        <FormField label="Postal Code" error={getFieldError("postcode")} required>
-          <Input
-            type="text"
-            value={address?.postcode || ""}
-            onChange={e => updateAddressField("postcode", e.target.value)}
-            onBlur={markTouched}
-            placeholder="Enter your postal code"
-            className="w-full"
-          />
-        </FormField>
-
-        <FormField label="Country" error={getFieldError("country")} required>
-          <select
-            value={address?.country || ""}
-            onChange={e => handleCountryChange(e.target.value)}
-            onBlur={markTouched}
-            className="block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500"
-          >
-            <option value="">Select a country</option>
-            {COUNTRY_OPTIONS.map(country => (
-              <option key={country.code} value={country.code}>
-                {country.name}
-              </option>
-            ))}
-          </select>
-        </FormField>
-      </div>
-    </div>
-  );
-}
diff --git a/apps/portal/src/features/auth/components/SignupForm/PasswordStep.tsx b/apps/portal/src/features/auth/components/SignupForm/PasswordStep.tsx
deleted file mode 100644
index 8013a19a..00000000
--- a/apps/portal/src/features/auth/components/SignupForm/PasswordStep.tsx
+++ /dev/null
@@ -1,109 +0,0 @@
-/**
- * Password Step Component
- * Password and security fields for signup using Zod validation
- */
-
-"use client";
-
-import { Input } from "@/components/atoms";
-import { FormField } from "@/components/molecules/FormField/FormField";
-import type { UseZodFormReturn } from "@customer-portal/validation";
-import type { SignupFormValues } from "./SignupForm";
-
-type PasswordStepProps = Pick<
-  UseZodFormReturn<SignupFormValues>,
-  "values" | "errors" | "touched" | "setValue" | "setTouchedField"
->;
-
-export function PasswordStep({
-  values,
-  errors,
-  touched,
-  setValue,
-  setTouchedField,
-}: PasswordStepProps) {
-  return (
-    <div className="space-y-6">
-      <FormField
-        label="Password"
-        error={touched.password ? errors.password : undefined}
-        required
-        helperText="Password must be at least 8 characters long"
-      >
-        <Input
-          type="password"
-          value={values.password}
-          onChange={e => setValue("password", e.target.value)}
-          onBlur={() => setTouchedField("password")}
-          placeholder="Create a secure password"
-          className="w-full"
-        />
-      </FormField>
-
-      <FormField
-        label="Confirm Password"
-        error={touched.confirmPassword ? errors.confirmPassword : undefined}
-        required
-      >
-        <Input
-          type="password"
-          value={values.confirmPassword}
-          onChange={e => setValue("confirmPassword", e.target.value)}
-          onBlur={() => setTouchedField("confirmPassword")}
-          placeholder="Confirm your password"
-          className="w-full"
-        />
-      </FormField>
-
-      <div className="space-y-4">
-        <div className="flex items-start">
-          <div className="flex items-center h-5">
-            <input
-              id="accept-terms"
-              name="accept-terms"
-              type="checkbox"
-              checked={values.acceptTerms}
-              onChange={e => setValue("acceptTerms", e.target.checked)}
-              onBlur={() => setTouchedField("acceptTerms")}
-              className="focus:ring-blue-500 h-4 w-4 text-blue-600 border-gray-300 rounded"
-            />
-          </div>
-          <div className="ml-3 text-sm">
-            <label htmlFor="accept-terms" className="font-medium text-gray-700">
-              I accept the{" "}
-              <a href="/terms" className="text-blue-600 hover:text-blue-500">
-                Terms of Service
-              </a>{" "}
-              and{" "}
-              <a href="/privacy" className="text-blue-600 hover:text-blue-500">
-                Privacy Policy
-              </a>
-            </label>
-            {touched.acceptTerms && errors.acceptTerms && (
-              <p className="mt-1 text-sm text-red-600">{errors.acceptTerms}</p>
-            )}
-          </div>
-        </div>
-
-        <div className="flex items-start">
-          <div className="flex items-center h-5">
-            <input
-              id="marketing-consent"
-              name="marketing-consent"
-              type="checkbox"
-              checked={values.marketingConsent}
-              onChange={e => setValue("marketingConsent", e.target.checked)}
-              onBlur={() => setTouchedField("marketingConsent")}
-              className="focus:ring-blue-500 h-4 w-4 text-blue-600 border-gray-300 rounded"
-            />
-          </div>
-          <div className="ml-3 text-sm">
-            <label htmlFor="marketing-consent" className="font-medium text-gray-700">
-              I would like to receive marketing communications and updates
-            </label>
-          </div>
-        </div>
-      </div>
-    </div>
-  );
-}
diff --git a/apps/portal/src/features/auth/components/SignupForm/PersonalStep.tsx b/apps/portal/src/features/auth/components/SignupForm/PersonalStep.tsx
deleted file mode 100644
index 5fa0410d..00000000
--- a/apps/portal/src/features/auth/components/SignupForm/PersonalStep.tsx
+++ /dev/null
@@ -1,108 +0,0 @@
-/**
- * Personal Step Component
- * Personal information fields for signup using Zod validation
- */
-
-"use client";
-
-import { Input } from "@/components/atoms";
-import { FormField } from "@/components/molecules/FormField/FormField";
-import type { FormErrors, FormTouched, UseZodFormReturn } from "@customer-portal/validation";
-import type { SignupFormValues } from "./SignupForm";
-
-interface PersonalStepProps {
-  values: SignupFormValues;
-  errors: FormErrors<SignupFormValues>;
-  touched: FormTouched<SignupFormValues>;
-  setValue: UseZodFormReturn<SignupFormValues>["setValue"];
-  setTouchedField: UseZodFormReturn<SignupFormValues>["setTouchedField"];
-}
-
-export function PersonalStep({
-  values,
-  errors,
-  touched,
-  setValue,
-  setTouchedField,
-}: PersonalStepProps) {
-  const getError = (field: keyof SignupFormValues) => {
-    return touched[field as string] ? errors[field as string] : undefined;
-  };
-
-  return (
-    <div className="space-y-6">
-      <div className="grid grid-cols-1 gap-6 sm:grid-cols-2">
-        <FormField label="First Name" error={getError("firstName")} required>
-          <Input
-            type="text"
-            value={values.firstName}
-            onChange={e => setValue("firstName", e.target.value)}
-            onBlur={() => setTouchedField("firstName")}
-            placeholder="Enter your first name"
-            className="w-full"
-          />
-        </FormField>
-
-        <FormField label="Last Name" error={getError("lastName")} required>
-          <Input
-            type="text"
-            value={values.lastName}
-            onChange={e => setValue("lastName", e.target.value)}
-            onBlur={() => setTouchedField("lastName")}
-            placeholder="Enter your last name"
-            className="w-full"
-          />
-        </FormField>
-      </div>
-
-      <FormField label="Email Address" error={getError("email")} required>
-        <Input
-          type="email"
-          value={values.email}
-          onChange={e => setValue("email", e.target.value)}
-          onBlur={() => setTouchedField("email")}
-          placeholder="Enter your email address"
-          className="w-full"
-        />
-      </FormField>
-
-      <FormField label="Phone Number" error={getError("phone")} required>
-        <Input
-          type="tel"
-          value={values.phone || ""}
-          onChange={e => setValue("phone", e.target.value)}
-          onBlur={() => setTouchedField("phone")}
-          placeholder="+81 XX-XXXX-XXXX"
-          className="w-full"
-        />
-      </FormField>
-
-      <FormField
-        label="Customer Number"
-        error={getError("sfNumber")}
-        required
-        helperText="Your existing customer number (minimum 6 characters)"
-      >
-        <Input
-          type="text"
-          value={values.sfNumber}
-          onChange={e => setValue("sfNumber", e.target.value)}
-          onBlur={() => setTouchedField("sfNumber")}
-          placeholder="Enter your customer number"
-          className="w-full"
-        />
-      </FormField>
-
-      <FormField label="Company (Optional)" error={getError("company")}>
-        <Input
-          type="text"
-          value={values.company || ""}
-          onChange={e => setValue("company", e.target.value)}
-          onBlur={() => setTouchedField("company")}
-          placeholder="Enter your company name"
-          className="w-full"
-        />
-      </FormField>
-    </div>
-  );
-}
diff --git a/apps/portal/src/features/auth/components/SignupForm/PreferencesStep.tsx b/apps/portal/src/features/auth/components/SignupForm/PreferencesStep.tsx
deleted file mode 100644
index 3ab6c1ac..00000000
--- a/apps/portal/src/features/auth/components/SignupForm/PreferencesStep.tsx
+++ /dev/null
@@ -1,85 +0,0 @@
-/**
- * Preferences Step Component
- * Terms acceptance and marketing preferences
- */
-
-"use client";
-
-import Link from "next/link";
-
-interface PreferencesStepProps {
-  formData: {
-    acceptTerms: boolean;
-    marketingConsent: boolean;
-  };
-  errors: {
-    acceptTerms?: string;
-  };
-  onFieldChange: (field: string, value: boolean) => void;
-  onFieldBlur: (field: string) => void;
-  loading?: boolean;
-}
-
-export function PreferencesStep({
-  formData,
-  errors,
-  onFieldChange,
-  onFieldBlur,
-  loading = false,
-}: PreferencesStepProps) {
-  return (
-    <div className="space-y-6">
-      <div className="space-y-4">
-        <div className="flex items-start space-x-3">
-          <input
-            type="checkbox"
-            id="acceptTerms"
-            checked={formData.acceptTerms}
-            onChange={e => onFieldChange("acceptTerms", e.target.checked)}
-            onBlur={() => onFieldBlur("acceptTerms")}
-            disabled={loading}
-            className="mt-1 rounded border-gray-300 text-blue-600 focus:ring-blue-500"
-          />
-          <div className="flex-1">
-            <label htmlFor="acceptTerms" className="text-sm text-gray-900">
-              I accept the{" "}
-              <Link href="/terms" className="text-blue-600 hover:text-blue-500 underline">
-                Terms and Conditions
-              </Link>{" "}
-              and{" "}
-              <Link href="/privacy" className="text-blue-600 hover:text-blue-500 underline">
-                Privacy Policy
-              </Link>
-              <span className="text-red-500 ml-1">*</span>
-            </label>
-            {errors.acceptTerms && (
-              <p className="mt-1 text-sm text-red-600">{errors.acceptTerms}</p>
-            )}
-          </div>
-        </div>
-
-        <div className="flex items-start space-x-3">
-          <input
-            type="checkbox"
-            id="marketingConsent"
-            checked={formData.marketingConsent}
-            onChange={e => onFieldChange("marketingConsent", e.target.checked)}
-            disabled={loading}
-            className="mt-1 rounded border-gray-300 text-blue-600 focus:ring-blue-500"
-          />
-          <label htmlFor="marketingConsent" className="text-sm text-gray-900">
-            I would like to receive marketing communications and product updates
-          </label>
-        </div>
-      </div>
-
-      <div className="bg-blue-50 border border-blue-200 rounded-lg p-4">
-        <h4 className="text-sm font-medium text-blue-900 mb-2">Almost done!</h4>
-        <p className="text-sm text-blue-700">
-          By clicking &quot;Create Account&quot;, you&apos;ll be able to access your dashboard and
-          start using our services immediately.
-        </p>
-      </div>
-    </div>
-  );
-}
diff --git a/apps/portal/src/features/auth/components/SignupForm/SignupForm.tsx b/apps/portal/src/features/auth/components/SignupForm/SignupForm.tsx
index 45d17674..ac1cb4dc 100644
--- a/apps/portal/src/features/auth/components/SignupForm/SignupForm.tsx
+++ b/apps/portal/src/features/auth/components/SignupForm/SignupForm.tsx
@@ -1,275 +1,156 @@
 /**
- * Signup Form Component
- * Multi-step signup form using Zod validation
+ * Signup Form - Multi-step signup using domain schemas
  */
 
 "use client";
 
-import { useState, useCallback, useMemo } from "react";
+import { useState, useCallback } from "react";
 import Link from "next/link";
 import { ErrorMessage } from "@/components/atoms";
 import { useSignup } from "../../hooks/use-auth";
 import {
-  type SignupRequest,
   signupInputSchema,
   buildSignupRequest,
 } from "@customer-portal/domain/auth";
+import { addressFormSchema } from "@customer-portal/domain/customer";
 import { useZodForm } from "@customer-portal/validation";
 import { z } from "zod";
 
-import { MultiStepForm, type FormStep } from "./MultiStepForm";
-import { AddressStep } from "./AddressStep";
-import { PasswordStep } from "./PasswordStep";
-import { PersonalStep } from "./PersonalStep";
+import { MultiStepForm } from "./MultiStepForm";
+import { AccountStep } from "./steps/AccountStep";
+import { AddressStep } from "./steps/AddressStep";
+import { PasswordStep } from "./steps/PasswordStep";
+import { ReviewStep } from "./steps/ReviewStep";
 import { getCountryCodeByName } from "@/lib/constants/countries";
 
-interface SignupFormProps {
-  onSuccess?: () => void;
-  onError?: (error: string) => void;
-  showLoginLink?: boolean;
-  className?: string;
-}
-
-/**
- * Frontend form schema - extends domain signupInputSchema with UI-specific fields
- *
- * Single source of truth: Domain layer (signupInputSchema) defines all validation rules
- * Frontend only adds: confirmPassword field and password matching logic
- */
-export const signupFormSchema = signupInputSchema
+// Extend domain schema with confirmPassword for frontend
+const signupFormSchema = signupInputSchema
   .extend({
     confirmPassword: z.string().min(1, "Please confirm your password"),
+    address: addressFormSchema,
   })
   .refine(data => data.acceptTerms === true, {
     message: "You must accept the terms and conditions",
     path: ["acceptTerms"],
   })
-  .superRefine((data, ctx) => {
-    if (data.password !== data.confirmPassword) {
-      ctx.addIssue({
-        code: z.ZodIssueCode.custom,
-        path: ["confirmPassword"],
-        message: "Passwords do not match",
-      });
-    }
+  .refine(data => data.password === data.confirmPassword, {
+    message: "Passwords do not match",
+    path: ["confirmPassword"],
   });
 
-export type SignupFormValues = z.infer<typeof signupFormSchema>;
+type SignupFormData = z.infer<typeof signupFormSchema>;
 
-export function SignupForm({
-  onSuccess,
-  onError,
-  showLoginLink = true,
-  className = "",
-}: SignupFormProps) {
+interface SignupFormProps {
+  onSuccess?: () => void;
+  onError?: (error: string) => void;
+  className?: string;
+}
+
+const STEPS = [
+  { key: "account", title: "Account Details", description: "Your contact information" },
+  { key: "address", title: "Service Address", description: "Where to deliver your SIM" },
+  { key: "password", title: "Create Password", description: "Secure your account" },
+  { key: "review", title: "Review & Accept", description: "Confirm your details" },
+] as const;
+
+export function SignupForm({ onSuccess, onError, className = "" }: SignupFormProps) {
   const { signup, loading, error, clearError } = useSignup();
-  const [currentStepIndex, setCurrentStepIndex] = useState(0);
+  const [step, setStep] = useState(0);
 
-  const handleSignup = useCallback(
-    async ({ confirmPassword: _confirm, ...formData }: SignupFormValues) => {
-      void _confirm;
-      clearError();
-      try {
-        const normalizeCountryCode = (value?: string) => {
-          if (!value) return "";
-          if (value.length === 2) return value.toUpperCase();
-          return getCountryCodeByName(value) ?? value;
-        };
-
-        const normalizedAddress = formData.address
-          ? (() => {
-              const countryValue = formData.address.country || formData.address.countryCode || "";
-              const normalizedCountry = normalizeCountryCode(countryValue);
-              return {
-                ...formData.address,
-                country: normalizedCountry,
-                countryCode: normalizedCountry,
-              };
-            })()
-          : undefined;
-
-        const request: SignupRequest = buildSignupRequest({
-          ...formData,
-          ...(normalizedAddress ? { address: normalizedAddress } : {}),
-        });
-        await signup(request);
-        onSuccess?.();
-      } catch (err) {
-        const message = err instanceof Error ? err.message : "Signup failed";
-        onError?.(message);
-        throw err; // Re-throw to let useZodForm handle the error state
-      }
-    },
-    [signup, onSuccess, onError, clearError]
-  );
-
-  const {
-    values,
-    errors,
-    touched,
-    isSubmitting,
-    setValue,
-    setTouchedField,
-    handleSubmit,
-    validate,
-  } = useZodForm<SignupFormValues>({
+  const form = useZodForm<SignupFormData>({
     schema: signupFormSchema,
     initialValues: {
-      email: "",
-      password: "",
-      confirmPassword: "",
+      sfNumber: "",
       firstName: "",
       lastName: "",
-      company: "",
+      email: "",
       phone: "",
-      sfNumber: "",
-      address: {
-        address1: "",
-        address2: "",
-        city: "",
-        state: "",
-        postcode: "",
-        country: "",
-        countryCode: "",
-      },
-      nationality: "",
-      dateOfBirth: "",
-      gender: "male" as const,
+      company: "",
+      address: { address1: "", address2: "", city: "", state: "", postcode: "", country: "", countryCode: "" },
+      password: "",
+      confirmPassword: "",
       acceptTerms: false,
       marketingConsent: false,
     },
-    onSubmit: handleSignup,
+    onSubmit: async data => {
+      clearError();
+      try {
+        const normalizedAddress = {
+          ...data.address,
+          country: getCountryCodeByName(data.address.country) ?? data.address.country,
+          countryCode: getCountryCodeByName(data.address.countryCode) ?? data.address.countryCode,
+        };
+        const request = buildSignupRequest({ ...data, address: normalizedAddress });
+        await signup(request);
+        onSuccess?.();
+      } catch (err) {
+        onError?.(err instanceof Error ? err.message : "Signup failed");
+        throw err;
+      }
+    },
   });
 
-  // Handle step change with validation
-  const handleStepChange = useCallback((stepIndex: number) => {
-    setCurrentStepIndex(stepIndex);
-  }, []);
+  const isLastStep = step === STEPS.length - 1;
 
-  // Step field definitions (memoized for performance)
-  const stepFields = useMemo(
-    () => ({
-      0: ["firstName", "lastName", "email", "phone"] as const,
-      1: ["address"] as const,
-      2: ["password", "confirmPassword"] as const,
-      3: ["sfNumber", "acceptTerms"] as const,
-    }),
-    []
-  );
+  const handleNext = useCallback(() => {
+    form.validate();
+    if (isLastStep) {
+      void form.handleSubmit();
+    } else {
+      setStep(s => s + 1);
+    }
+  }, [form, isLastStep]);
 
-  // Validate specific step fields (optimized)
-  const validateStep = useCallback(
-    (stepIndex: number): boolean => {
-      const fields = stepFields[stepIndex as keyof typeof stepFields] || [];
+  // Wrap form methods to have generic types for step components
+  const formProps = {
+    values: form.values,
+    errors: form.errors,
+    touched: form.touched,
+    setValue: (field: string, value: unknown) => form.setValue(field as keyof SignupFormData, value as never),
+    setTouchedField: (field: string) => form.setTouchedField(field as keyof SignupFormData),
+  };
 
-      // Mark fields as touched and check for errors
-      fields.forEach(field => setTouchedField(field));
-
-      // Use the validate function to get current validation state
-      return validate() || !fields.some(field => Boolean(errors[String(field)]));
-    },
-    [stepFields, setTouchedField, validate, errors]
-  );
-
-  const steps: FormStep[] = [
-    {
-      key: "personal",
-      title: "Personal Information",
-      description: "Tell us about yourself",
-      content: (
-        <PersonalStep
-          values={values}
-          errors={errors}
-          touched={touched}
-          setValue={setValue}
-          setTouchedField={setTouchedField}
-        />
-      ),
-    },
-    {
-      key: "address",
-      title: "Address",
-      description: "Where should we send your SIM?",
-      content: (
-        <AddressStep
-          address={values.address}
-          errors={errors}
-          touched={touched}
-          onAddressChange={address => setValue("address", address)}
-          setTouchedField={setTouchedField}
-        />
-      ),
-    },
-    {
-      key: "security",
-      title: "Security",
-      description: "Create a secure password",
-      content: (
-        <PasswordStep
-          values={values}
-          errors={errors}
-          touched={touched}
-          setValue={setValue}
-          setTouchedField={setTouchedField}
-        />
-      ),
-    },
+  const stepContent = [
+    <AccountStep key="account" form={formProps} />,
+    <AddressStep key="address" form={formProps} />,
+    <PasswordStep key="password" form={formProps} />,
+    <ReviewStep key="review" form={formProps} />,
   ];
 
-  const currentStepFields = stepFields[currentStepIndex as keyof typeof stepFields] ?? [];
-  const canProceed =
-    currentStepIndex === steps.length - 1
-      ? true
-      : currentStepFields.every(field => !errors[String(field)]);
+  const steps = STEPS.map((s, i) => ({
+    ...s,
+    content: stepContent[i],
+  }));
 
   return (
     <div className={`w-full max-w-2xl mx-auto ${className}`}>
       <div className="bg-white shadow-sm rounded-lg border border-gray-200 p-6">
-        <div className="mb-8">
-          <h1 className="text-2xl font-bold text-gray-900 mb-2">Create Your Account</h1>
-          <p className="text-gray-600">
-            Join thousands of customers enjoying reliable connectivity
-          </p>
-        </div>
-
         <MultiStepForm
           steps={steps}
-          currentStep={currentStepIndex}
-          onStepChange={handleStepChange}
-          onNext={() => {
-            if (validateStep(currentStepIndex)) {
-              if (currentStepIndex < steps.length - 1) {
-                setCurrentStepIndex(currentStepIndex + 1);
-              } else {
-                void handleSubmit();
-              }
-            }
-          }}
-          onPrevious={() => {
-            if (currentStepIndex > 0) {
-              setCurrentStepIndex(currentStepIndex - 1);
-            }
-          }}
-          isLastStep={currentStepIndex === steps.length - 1}
-          isSubmitting={isSubmitting || loading}
-          canProceed={canProceed}
+          currentStep={step}
+          onNext={handleNext}
+          onPrevious={() => setStep(s => Math.max(0, s - 1))}
+          isLastStep={isLastStep}
+          isSubmitting={form.isSubmitting || loading}
+          canProceed={true}
         />
 
         {error && <ErrorMessage className="mt-4 text-center">{error}</ErrorMessage>}
 
-        {showLoginLink && (
-          <div className="mt-6 text-center">
-            <p className="text-sm text-gray-600">
-              Already have an account?{" "}
-              <Link
-                href="/auth/login"
-                className="font-medium text-blue-600 hover:text-blue-500 transition-colors"
-              >
-                Sign in
-              </Link>
-            </p>
-          </div>
-        )}
+        <div className="mt-6 text-center border-t border-gray-100 pt-6 space-y-2">
+          <p className="text-sm text-gray-600">
+            Already have an account?{" "}
+            <Link href="/auth/login" className="font-medium text-blue-600 hover:text-blue-500">
+              Sign in
+            </Link>
+          </p>
+          <p className="text-sm text-gray-600">
+            Existing customer?{" "}
+            <Link href="/auth/link-whmcs" className="font-medium text-blue-600 hover:text-blue-500">
+              Migrate your account
+            </Link>
+          </p>
+        </div>
       </div>
     </div>
   );
diff --git a/apps/portal/src/features/auth/components/SignupForm/index.ts b/apps/portal/src/features/auth/components/SignupForm/index.ts
index 7ca3bd4c..7aec3070 100644
--- a/apps/portal/src/features/auth/components/SignupForm/index.ts
+++ b/apps/portal/src/features/auth/components/SignupForm/index.ts
@@ -1,6 +1,3 @@
 export { SignupForm } from "./SignupForm";
 export { MultiStepForm } from "./MultiStepForm";
-export { AccountStep } from "./AccountStep";
-export { PersonalStep } from "./PersonalStep";
-export { AddressStep } from "./AddressStep";
-export { PreferencesStep } from "./PreferencesStep";
+export * from "./steps";
diff --git a/apps/portal/src/features/auth/components/SignupForm/steps/AccountStep.tsx b/apps/portal/src/features/auth/components/SignupForm/steps/AccountStep.tsx
new file mode 100644
index 00000000..4b7b2827
--- /dev/null
+++ b/apps/portal/src/features/auth/components/SignupForm/steps/AccountStep.tsx
@@ -0,0 +1,98 @@
+/**
+ * Account Step - Customer number and contact info
+ */
+
+"use client";
+
+import { Input } from "@/components/atoms";
+import { FormField } from "@/components/molecules/FormField/FormField";
+
+interface AccountStepProps {
+  form: {
+    values: { sfNumber: string; firstName: string; lastName: string; email: string; phone: string; company?: string };
+    errors: Record<string, string | undefined>;
+    touched: Record<string, boolean | undefined>;
+    setValue: (field: string, value: unknown) => void;
+    setTouchedField: (field: string) => void;
+  };
+}
+
+export function AccountStep({ form }: AccountStepProps) {
+  const { values, errors, touched, setValue, setTouchedField } = form;
+  const getError = (field: string) => (touched[field] ? errors[field] : undefined);
+
+  return (
+    <div className="space-y-5">
+      <div className="bg-blue-50 border border-blue-200 rounded-lg p-4">
+        <FormField
+          label="Customer Number"
+          error={getError("sfNumber")}
+          required
+          helperText="Your Assist Solutions customer number"
+        >
+          <Input
+            value={values.sfNumber}
+            onChange={e => setValue("sfNumber", e.target.value)}
+            onBlur={() => setTouchedField("sfNumber")}
+            placeholder="e.g., AST-123456"
+            className="w-full bg-white"
+            autoFocus
+          />
+        </FormField>
+      </div>
+
+      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
+        <FormField label="First Name" error={getError("firstName")} required>
+          <Input
+            value={values.firstName}
+            onChange={e => setValue("firstName", e.target.value)}
+            onBlur={() => setTouchedField("firstName")}
+            placeholder="Enter your first name"
+            autoComplete="given-name"
+          />
+        </FormField>
+        <FormField label="Last Name" error={getError("lastName")} required>
+          <Input
+            value={values.lastName}
+            onChange={e => setValue("lastName", e.target.value)}
+            onBlur={() => setTouchedField("lastName")}
+            placeholder="Enter your last name"
+            autoComplete="family-name"
+          />
+        </FormField>
+      </div>
+
+      <FormField label="Email Address" error={getError("email")} required>
+        <Input
+          type="email"
+          value={values.email}
+          onChange={e => setValue("email", e.target.value)}
+          onBlur={() => setTouchedField("email")}
+          placeholder="you@example.com"
+          autoComplete="email"
+        />
+      </FormField>
+
+      <FormField label="Phone Number" error={getError("phone")} required>
+        <Input
+          type="tel"
+          value={values.phone}
+          onChange={e => setValue("phone", e.target.value)}
+          onBlur={() => setTouchedField("phone")}
+          placeholder="+81 XX-XXXX-XXXX"
+          autoComplete="tel"
+        />
+      </FormField>
+
+      <FormField label="Company" error={getError("company")} helperText="Optional">
+        <Input
+          value={values.company ?? ""}
+          onChange={e => setValue("company", e.target.value)}
+          onBlur={() => setTouchedField("company")}
+          placeholder="Enter your company name"
+          autoComplete="organization"
+        />
+      </FormField>
+    </div>
+  );
+}
diff --git a/apps/portal/src/features/auth/components/SignupForm/steps/AddressStep.tsx b/apps/portal/src/features/auth/components/SignupForm/steps/AddressStep.tsx
new file mode 100644
index 00000000..10c11d78
--- /dev/null
+++ b/apps/portal/src/features/auth/components/SignupForm/steps/AddressStep.tsx
@@ -0,0 +1,125 @@
+/**
+ * Address Step - Service address
+ */
+
+"use client";
+
+import { Input } from "@/components/atoms";
+import { FormField } from "@/components/molecules/FormField/FormField";
+import { COUNTRY_OPTIONS } from "@/lib/constants/countries";
+
+interface AddressData {
+  address1: string;
+  address2?: string;
+  city: string;
+  state: string;
+  postcode: string;
+  country: string;
+  countryCode?: string;
+}
+
+interface AddressStepProps {
+  form: {
+    values: { address: AddressData };
+    errors: Record<string, string | undefined>;
+    touched: Record<string, boolean | undefined>;
+    setValue: (field: string, value: unknown) => void;
+    setTouchedField: (field: string) => void;
+  };
+}
+
+export function AddressStep({ form }: AddressStepProps) {
+  const { values, errors, touched, setValue, setTouchedField } = form;
+  const address = values.address;
+
+  const getError = (field: string) => {
+    const key = `address.${field}`;
+    return touched[key] || touched.address ? (errors[key] ?? errors[field]) : undefined;
+  };
+
+  const updateAddress = (field: keyof AddressData, value: string) => {
+    setValue("address", { ...address, [field]: value });
+  };
+
+  const handleCountryChange = (code: string) => {
+    setValue("address", { ...address, country: code, countryCode: code });
+  };
+
+  const markTouched = () => setTouchedField("address");
+
+  return (
+    <div className="space-y-5">
+      <FormField label="Street Address" error={getError("address1")} required>
+        <Input
+          value={address.address1}
+          onChange={e => updateAddress("address1", e.target.value)}
+          onBlur={markTouched}
+          placeholder="123 Main Street"
+          autoComplete="address-line1"
+          autoFocus
+        />
+      </FormField>
+
+      <FormField label="Address Line 2" error={getError("address2")} helperText="Optional">
+        <Input
+          value={address.address2 ?? ""}
+          onChange={e => updateAddress("address2", e.target.value)}
+          onBlur={markTouched}
+          placeholder="Apartment, suite, etc."
+          autoComplete="address-line2"
+        />
+      </FormField>
+
+      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
+        <FormField label="City" error={getError("city")} required>
+          <Input
+            value={address.city}
+            onChange={e => updateAddress("city", e.target.value)}
+            onBlur={markTouched}
+            placeholder="Tokyo"
+            autoComplete="address-level2"
+          />
+        </FormField>
+        <FormField label="State / Prefecture" error={getError("state")} required>
+          <Input
+            value={address.state}
+            onChange={e => updateAddress("state", e.target.value)}
+            onBlur={markTouched}
+            placeholder="Tokyo"
+            autoComplete="address-level1"
+          />
+        </FormField>
+      </div>
+
+      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
+        <FormField label="Postal Code" error={getError("postcode")} required>
+          <Input
+            value={address.postcode}
+            onChange={e => updateAddress("postcode", e.target.value)}
+            onBlur={markTouched}
+            placeholder="100-0001"
+            autoComplete="postal-code"
+          />
+        </FormField>
+        <FormField label="Country" error={getError("country")} required>
+          <select
+            value={address.country}
+            onChange={e => handleCountryChange(e.target.value)}
+            onBlur={markTouched}
+            className="block w-full h-10 px-3 py-2 border border-gray-300 rounded-md shadow-sm bg-white focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
+            autoComplete="country"
+          >
+            <option value="" disabled>Select country</option>
+            {COUNTRY_OPTIONS.map(c => (
+              <option key={c.code} value={c.code}>{c.name}</option>
+            ))}
+          </select>
+        </FormField>
+      </div>
+
+      <p className="text-sm text-gray-500">
+        This address will be used for shipping SIM cards and other deliveries.
+      </p>
+    </div>
+  );
+}
diff --git a/apps/portal/src/features/auth/components/SignupForm/steps/PasswordStep.tsx b/apps/portal/src/features/auth/components/SignupForm/steps/PasswordStep.tsx
new file mode 100644
index 00000000..d6604ab2
--- /dev/null
+++ b/apps/portal/src/features/auth/components/SignupForm/steps/PasswordStep.tsx
@@ -0,0 +1,87 @@
+/**
+ * Password Step - Password creation with strength indicator
+ */
+
+"use client";
+
+import { Input } from "@/components/atoms";
+import { FormField } from "@/components/molecules/FormField/FormField";
+import { checkPasswordStrength, getPasswordStrengthDisplay } from "@customer-portal/domain/auth";
+
+interface PasswordStepProps {
+  form: {
+    values: { password: string; confirmPassword: string };
+    errors: Record<string, string | undefined>;
+    touched: Record<string, boolean | undefined>;
+    setValue: (field: string, value: unknown) => void;
+    setTouchedField: (field: string) => void;
+  };
+}
+
+export function PasswordStep({ form }: PasswordStepProps) {
+  const { values, errors, touched, setValue, setTouchedField } = form;
+  const { requirements, strength, isValid } = checkPasswordStrength(values.password);
+  const { label, colorClass } = getPasswordStrengthDisplay(strength);
+  const passwordsMatch = values.password === values.confirmPassword;
+
+  return (
+    <div className="space-y-6">
+      <FormField
+        label="Password"
+        error={touched.password ? errors.password : undefined}
+        required
+      >
+        <Input
+          type="password"
+          value={values.password}
+          onChange={e => setValue("password", e.target.value)}
+          onBlur={() => setTouchedField("password")}
+          placeholder="Create a secure password"
+          autoComplete="new-password"
+        />
+      </FormField>
+
+      {values.password && (
+        <div className="space-y-3">
+          <div className="flex items-center gap-2">
+            <div className="flex-1 h-2 bg-gray-200 rounded-full overflow-hidden">
+              <div className={`h-full transition-all ${colorClass}`} style={{ width: `${strength}%` }} />
+            </div>
+            <span className={`text-xs font-medium ${isValid ? "text-green-600" : "text-gray-500"}`}>{label}</span>
+          </div>
+          <div className="grid grid-cols-2 gap-1">
+            {requirements.map(r => (
+              <div key={r.key} className="flex items-center gap-1.5 text-xs">
+                <span className={r.met ? "text-green-500" : "text-gray-300"}>
+                  {r.met ? "✓" : "○"}
+                </span>
+                <span className={r.met ? "text-green-700" : "text-gray-500"}>{r.label}</span>
+              </div>
+            ))}
+          </div>
+        </div>
+      )}
+
+      <FormField
+        label="Confirm Password"
+        error={touched.confirmPassword ? errors.confirmPassword : undefined}
+        required
+      >
+        <Input
+          type="password"
+          value={values.confirmPassword}
+          onChange={e => setValue("confirmPassword", e.target.value)}
+          onBlur={() => setTouchedField("confirmPassword")}
+          placeholder="Re-enter your password"
+          autoComplete="new-password"
+        />
+      </FormField>
+
+      {values.confirmPassword && (
+        <p className={`text-sm ${passwordsMatch ? "text-green-600" : "text-red-600"}`}>
+          {passwordsMatch ? "✓ Passwords match" : "✗ Passwords do not match"}
+        </p>
+      )}
+    </div>
+  );
+}
diff --git a/apps/portal/src/features/auth/components/SignupForm/steps/ReviewStep.tsx b/apps/portal/src/features/auth/components/SignupForm/steps/ReviewStep.tsx
new file mode 100644
index 00000000..6613248a
--- /dev/null
+++ b/apps/portal/src/features/auth/components/SignupForm/steps/ReviewStep.tsx
@@ -0,0 +1,107 @@
+/**
+ * Review Step - Summary and terms acceptance
+ */
+
+"use client";
+
+import Link from "next/link";
+
+interface ReviewStepProps {
+  form: {
+    values: {
+      firstName: string;
+      lastName: string;
+      email: string;
+      phone: string;
+      sfNumber: string;
+      address: { address1: string; city: string; state: string; postcode: string };
+      acceptTerms: boolean;
+      marketingConsent?: boolean;
+    };
+    errors: Record<string, string | undefined>;
+    touched: Record<string, boolean | undefined>;
+    setValue: (field: string, value: unknown) => void;
+    setTouchedField: (field: string) => void;
+  };
+}
+
+export function ReviewStep({ form }: ReviewStepProps) {
+  const { values, errors, touched, setValue, setTouchedField } = form;
+
+  return (
+    <div className="space-y-6">
+      {/* Summary */}
+      <div className="bg-gray-50 rounded-lg p-4 border border-gray-200">
+        <h4 className="text-sm font-medium text-gray-900 mb-3">Account Summary</h4>
+        <dl className="grid grid-cols-1 gap-2 text-sm">
+          <div className="flex justify-between">
+            <dt className="text-gray-500">Name</dt>
+            <dd className="text-gray-900 font-medium">{values.firstName} {values.lastName}</dd>
+          </div>
+          <div className="flex justify-between">
+            <dt className="text-gray-500">Email</dt>
+            <dd className="text-gray-900 font-medium">{values.email}</dd>
+          </div>
+          <div className="flex justify-between">
+            <dt className="text-gray-500">Phone</dt>
+            <dd className="text-gray-900 font-medium">{values.phone}</dd>
+          </div>
+          <div className="flex justify-between">
+            <dt className="text-gray-500">Customer Number</dt>
+            <dd className="text-gray-900 font-medium">{values.sfNumber}</dd>
+          </div>
+          {values.address?.address1 && (
+            <div className="flex justify-between">
+              <dt className="text-gray-500">Address</dt>
+              <dd className="text-gray-900 font-medium text-right">
+                {values.address.address1}<br />
+                {values.address.city}, {values.address.state} {values.address.postcode}
+              </dd>
+            </div>
+          )}
+        </dl>
+      </div>
+
+      {/* Terms */}
+      <div className="space-y-4">
+        <label className="flex items-start gap-3 cursor-pointer">
+          <input
+            type="checkbox"
+            checked={values.acceptTerms}
+            onChange={e => setValue("acceptTerms", e.target.checked)}
+            onBlur={() => setTouchedField("acceptTerms")}
+            className="mt-0.5 h-4 w-4 text-blue-600 border-gray-300 rounded focus:ring-blue-500"
+          />
+          <span className="text-sm text-gray-700">
+            I accept the{" "}
+            <Link href="/terms" className="text-blue-600 hover:underline" target="_blank">Terms of Service</Link>
+            {" "}and{" "}
+            <Link href="/privacy" className="text-blue-600 hover:underline" target="_blank">Privacy Policy</Link>
+            <span className="text-red-500">*</span>
+          </span>
+        </label>
+        {touched.acceptTerms && errors.acceptTerms && (
+          <p className="text-sm text-red-600 ml-7">{errors.acceptTerms}</p>
+        )}
+
+        <label className="flex items-start gap-3 cursor-pointer">
+          <input
+            type="checkbox"
+            checked={values.marketingConsent ?? false}
+            onChange={e => setValue("marketingConsent", e.target.checked)}
+            className="mt-0.5 h-4 w-4 text-blue-600 border-gray-300 rounded focus:ring-blue-500"
+          />
+          <span className="text-sm text-gray-700">
+            Send me marketing communications and product updates
+            <span className="block text-xs text-gray-500">You can unsubscribe anytime</span>
+          </span>
+        </label>
+      </div>
+
+      {/* Ready message */}
+      <div className="bg-blue-50 border border-blue-200 rounded-lg p-4 text-sm text-blue-700">
+        By clicking &quot;Create Account&quot;, your account will be created and you can start managing your services.
+      </div>
+    </div>
+  );
+}
diff --git a/apps/portal/src/features/auth/components/SignupForm/steps/index.ts b/apps/portal/src/features/auth/components/SignupForm/steps/index.ts
new file mode 100644
index 00000000..bcfc995d
--- /dev/null
+++ b/apps/portal/src/features/auth/components/SignupForm/steps/index.ts
@@ -0,0 +1,5 @@
+export { AccountStep } from "./AccountStep";
+export { AddressStep } from "./AddressStep";
+export { PasswordStep } from "./PasswordStep";
+export { ReviewStep } from "./ReviewStep";
+
diff --git a/apps/portal/src/features/auth/services/auth.store.ts b/apps/portal/src/features/auth/services/auth.store.ts
index 346c21b7..1a9e1741 100644
--- a/apps/portal/src/features/auth/services/auth.store.ts
+++ b/apps/portal/src/features/auth/services/auth.store.ts
@@ -6,7 +6,7 @@
 import { create } from "zustand";
 import { apiClient } from "@/lib/api";
 import { getNullableData } from "@/lib/api/response-helpers";
-import { getErrorInfo } from "@/lib/utils/error-handling";
+import { parseError } from "@/lib/utils/error-handling";
 import { logger } from "@/lib/logger";
 import {
   authResponseSchema,
@@ -88,8 +88,8 @@ export const useAuthStore = create<AuthState>()((set, get) => {
       applyAuthResponse(parsed.data);
     } catch (error) {
       logger.error("Failed to refresh session", error);
-      const errorInfo = getErrorInfo(error);
-      const reason = logoutReasonFromErrorCode(errorInfo.code) ?? ("session-expired" as const);
+      const parsed = parseError(error);
+      const reason = logoutReasonFromErrorCode(parsed.code) ?? ("session-expired" as const);
       await get().logout({ reason });
       throw error;
     }
@@ -144,8 +144,8 @@ export const useAuthStore = create<AuthState>()((set, get) => {
         }
         applyAuthResponse(parsed.data, true); // Keep loading for redirect
       } catch (error) {
-        const errorInfo = getErrorInfo(error);
-        set({ loading: false, error: errorInfo.message, isAuthenticated: false });
+        const parsed = parseError(error);
+        set({ loading: false, error: parsed.message, isAuthenticated: false });
         throw error;
       }
     },
@@ -340,9 +340,9 @@ export const useAuthStore = create<AuthState>()((set, get) => {
       try {
         await fetchProfile();
       } catch (error) {
-        const errorInfo = getErrorInfo(error);
-        if (errorInfo.shouldLogout) {
-          const reason = logoutReasonFromErrorCode(errorInfo.code) ?? ("session-expired" as const);
+        const parsed = parseError(error);
+        if (parsed.shouldLogout) {
+          const reason = logoutReasonFromErrorCode(parsed.code) ?? ("session-expired" as const);
           await get().logout({ reason });
           return;
         }
diff --git a/apps/portal/src/features/auth/views/LinkWhmcsView.tsx b/apps/portal/src/features/auth/views/LinkWhmcsView.tsx
index ee2e9e9b..28ae0f15 100644
--- a/apps/portal/src/features/auth/views/LinkWhmcsView.tsx
+++ b/apps/portal/src/features/auth/views/LinkWhmcsView.tsx
@@ -1,79 +1,79 @@
+/**
+ * Link WHMCS View - Account migration page
+ */
+
 "use client";
 
 import Link from "next/link";
 import { useRouter } from "next/navigation";
 import { AuthLayout } from "../components";
 import { LinkWhmcsForm } from "@/features/auth/components";
+import { MIGRATION_TRANSFER_ITEMS, MIGRATION_STEPS } from "@customer-portal/domain/auth";
 
 export function LinkWhmcsView() {
   const router = useRouter();
 
   return (
     <AuthLayout
-      title="Transfer your existing account"
-      subtitle="Move your existing Assist Solutions account to our new portal"
+      title="Transfer Your Account"
+      subtitle="Migrate your existing Assist Solutions account to our upgraded portal"
     >
-      <div className="space-y-8">
-        <div className="p-5 bg-blue-50 border border-blue-200 rounded-xl">
-          <div className="flex">
-            <div className="flex-shrink-0">
-              <svg className="h-5 w-5 text-blue-500" viewBox="0 0 20 20" fill="currentColor">
-                <path
-                  fillRule="evenodd"
-                  d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7-4a1 1 0 11-2 0 1 1 0 012 0zM9 9a1 1 0 000 2v3a1 1 0 001 1h1a1 1 0 100-2v-3a1 1 0 00-1-1H9z"
-                  clipRule="evenodd"
-                />
-              </svg>
-            </div>
-            <div className="ml-3 text-sm text-blue-700 space-y-2">
-              <p>
-                We&apos;ve upgraded our customer portal. Use your existing Assist Solutions
-                credentials to transfer your account and gain access to the new experience.
-              </p>
-              <ul className="list-disc list-inside space-y-1">
-                <li>All of your services and billing history will come with you</li>
-                <li>We&apos;ll guide you through creating a new, secure password afterwards</li>
-                <li>Your previous login credentials will no longer be needed once you transfer</li>
-              </ul>
-            </div>
-          </div>
-        </div>
-
-        <LinkWhmcsForm
-          onTransferred={result => {
-            const email = result.user.email;
-            if (result.needsPasswordSet) {
-              router.push(`/auth/set-password?email=${encodeURIComponent(email)}`);
-              return;
-            }
-            router.push("/dashboard");
-          }}
-        />
-
-        <div className="space-y-2 text-sm text-gray-600">
-          <p>
-            Need a new account?{" "}
-            <Link href="/auth/signup" className="text-blue-600 hover:text-blue-500">
-              Create one here
-            </Link>
-          </p>
-          <p>
-            Already transferred your account?{" "}
-            <Link href="/auth/login" className="text-blue-600 hover:text-blue-500">
-              Sign in here
-            </Link>
-          </p>
-        </div>
-
-        <div className="pt-6 border-t border-gray-200 space-y-2 text-sm text-gray-600">
-          <h3 className="font-medium text-gray-900">How the transfer works</h3>
-          <ul className="list-disc list-inside space-y-1">
-            <li>Enter the email and password you use for the legacy portal</li>
-            <li>We verify your account and ask you to set a new secure password</li>
-            <li>All existing subscriptions, invoices, and tickets stay connected</li>
-            <li>Need help? Contact support and we&apos;ll guide you through it</li>
+      <div className="space-y-6">
+        {/* What transfers */}
+        <div className="bg-blue-50 border border-blue-200 rounded-lg p-4">
+          <p className="text-sm font-medium text-blue-800 mb-2">What gets transferred:</p>
+          <ul className="grid grid-cols-2 gap-1 text-sm text-blue-700">
+            {MIGRATION_TRANSFER_ITEMS.map((item, i) => (
+              <li key={i} className="flex items-center gap-1.5">
+                <span className="text-blue-500">✓</span> {item}
+              </li>
+            ))}
           </ul>
         </div>
+
+        {/* Form */}
+        <div className="bg-white rounded-lg border border-gray-200 p-6">
+          <h2 className="text-lg font-semibold text-gray-900 mb-1">Enter Legacy Portal Credentials</h2>
+          <p className="text-sm text-gray-600 mb-5">Use your previous Assist Solutions portal email and password.</p>
+          <LinkWhmcsForm
+            onTransferred={result => {
+              if (result.needsPasswordSet) {
+                router.push(`/auth/set-password?email=${encodeURIComponent(result.user.email)}`);
+              } else {
+                router.push("/dashboard");
+              }
+            }}
+          />
+        </div>
+
+        {/* Links */}
+        <div className="flex justify-center gap-6 text-sm">
+          <span className="text-gray-600">
+            New customer? <Link href="/auth/signup" className="text-blue-600 hover:underline">Create account</Link>
+          </span>
+          <span className="text-gray-600">
+            Already transferred? <Link href="/auth/login" className="text-blue-600 hover:underline">Sign in</Link>
+          </span>
+        </div>
+
+        {/* Steps */}
+        <div className="border-t pt-6">
+          <h3 className="text-sm font-semibold text-gray-900 mb-3">How it works</h3>
+          <ol className="space-y-2">
+            {MIGRATION_STEPS.map((step, i) => (
+              <li key={i} className="flex items-start gap-3 text-sm">
+                <span className="flex-shrink-0 w-5 h-5 rounded-full bg-blue-100 text-blue-600 text-xs flex items-center justify-center font-medium">
+                  {i + 1}
+                </span>
+                <span className="text-gray-600">{step}</span>
+              </li>
+            ))}
+          </ol>
+        </div>
+
+        <p className="text-center text-sm text-gray-500">
+          Need help? <Link href="/support" className="text-blue-600 hover:underline">Contact support</Link>
+        </p>
       </div>
     </AuthLayout>
   );
diff --git a/apps/portal/src/features/auth/views/SignupView.tsx b/apps/portal/src/features/auth/views/SignupView.tsx
index 6ec93121..d206f69d 100644
--- a/apps/portal/src/features/auth/views/SignupView.tsx
+++ b/apps/portal/src/features/auth/views/SignupView.tsx
@@ -11,20 +11,10 @@ export function SignupView() {
   return (
     <>
       <AuthLayout
-        title="Create your portal account"
-        subtitle="Verify your details and set up secure access in a few guided steps"
+        title="Create Your Account"
+        subtitle="Set up your portal access in a few simple steps"
       >
-        <div className="space-y-8">
-          <div className="bg-blue-50 border border-blue-200 rounded-xl p-5">
-            <h2 className="text-sm font-semibold text-blue-800 mb-3">What you&apos;ll need</h2>
-            <ul className="text-sm text-blue-700 space-y-2 list-disc list-inside">
-              <li>Your Assist Solutions customer number</li>
-              <li>Primary contact details and service address</li>
-              <li>A secure password that meets our enhanced requirements</li>
-            </ul>
-          </div>
-          <SignupForm />
-        </div>
+        <SignupForm />
       </AuthLayout>
 
       {/* Full-page loading overlay during authentication */}
diff --git a/apps/portal/src/features/catalog/components/base/EnhancedOrderSummary.tsx b/apps/portal/src/features/catalog/components/base/EnhancedOrderSummary.tsx
index 2bfeadbc..5dbbe283 100644
--- a/apps/portal/src/features/catalog/components/base/EnhancedOrderSummary.tsx
+++ b/apps/portal/src/features/catalog/components/base/EnhancedOrderSummary.tsx
@@ -21,7 +21,7 @@ export type OrderItem = CatalogProductBase & {
   itemClass?: string;
 };
 
-export interface OrderConfiguration {
+export interface OrderSummaryConfiguration {
   label: string;
   value: string;
   important?: boolean;
@@ -45,7 +45,7 @@ export interface EnhancedOrderSummaryProps {
   planDescription?: string;
 
   // Configuration details
-  configurations?: OrderConfiguration[];
+  configurations?: OrderSummaryConfiguration[];
 
   // Additional information
   infoLines?: string[];
diff --git a/apps/portal/src/features/catalog/components/index.ts b/apps/portal/src/features/catalog/components/index.ts
index b7fa0154..cc5786d7 100644
--- a/apps/portal/src/features/catalog/components/index.ts
+++ b/apps/portal/src/features/catalog/components/index.ts
@@ -35,7 +35,7 @@ export type {
 export type {
   EnhancedOrderSummaryProps,
   OrderItem,
-  OrderConfiguration,
+  OrderSummaryConfiguration,
   OrderTotals,
 } from "./base/EnhancedOrderSummary";
 export type { ConfigurationStepProps, StepValidation } from "./base/ConfigurationStep";
diff --git a/apps/portal/src/features/catalog/utils/catalog.utils.ts b/apps/portal/src/features/catalog/utils/catalog.utils.ts
index 5d12c5c2..9033a926 100644
--- a/apps/portal/src/features/catalog/utils/catalog.utils.ts
+++ b/apps/portal/src/features/catalog/utils/catalog.utils.ts
@@ -10,6 +10,7 @@ import type {
   SimCatalogProduct,
   VpnCatalogProduct,
 } from "@customer-portal/domain/catalog";
+import { calculateSavingsPercentage } from "@customer-portal/domain/catalog";
 
 type CatalogProduct =
   | InternetPlanCatalogItem
@@ -49,8 +50,6 @@ export function isProductRecommended(product: CatalogProduct): boolean {
 
 /**
  * Calculate savings percentage (if applicable)
+ * Re-exported from domain for backward compatibility
  */
-export function calculateSavings(originalPrice: number, currentPrice: number): number {
-  if (originalPrice <= currentPrice) return 0;
-  return Math.round(((originalPrice - currentPrice) / originalPrice) * 100);
-}
+export const calculateSavings = calculateSavingsPercentage;
diff --git a/apps/portal/src/features/catalog/utils/pricing.ts b/apps/portal/src/features/catalog/utils/pricing.ts
index aea8d379..ec9e4e57 100644
--- a/apps/portal/src/features/catalog/utils/pricing.ts
+++ b/apps/portal/src/features/catalog/utils/pricing.ts
@@ -3,35 +3,15 @@
  * These are UI-specific formatting helpers, not business logic
  */
 
-import type { CatalogProductBase } from "@customer-portal/domain/catalog";
+import {
+  getCatalogProductPriceDisplay,
+  type CatalogProductBase,
+  type CatalogPriceInfo,
+} from "@customer-portal/domain/catalog";
 
-export interface PriceInfo {
-  display: string;
-  monthly: number | null;
-  oneTime: number | null;
-  currency: string;
-}
+// Re-export domain type for compatibility
+export type PriceInfo = CatalogPriceInfo;
 
 export function getDisplayPrice(item: CatalogProductBase): PriceInfo | null {
-  const monthlyPrice = item.monthlyPrice ?? null;
-  const oneTimePrice = item.oneTimePrice ?? null;
-  const currency = "JPY";
-
-  if (monthlyPrice === null && oneTimePrice === null) {
-    return null;
-  }
-
-  let display = "";
-  if (monthlyPrice !== null && monthlyPrice > 0) {
-    display = `¥${monthlyPrice.toLocaleString()}/month`;
-  } else if (oneTimePrice !== null && oneTimePrice > 0) {
-    display = `¥${oneTimePrice.toLocaleString()} (one-time)`;
-  }
-
-  return {
-    display,
-    monthly: monthlyPrice,
-    oneTime: oneTimePrice,
-    currency,
-  };
+  return getCatalogProductPriceDisplay(item);
 }
diff --git a/apps/portal/src/features/checkout/hooks/useCheckout.ts b/apps/portal/src/features/checkout/hooks/useCheckout.ts
index 6f259a2a..0a760a24 100644
--- a/apps/portal/src/features/checkout/hooks/useCheckout.ts
+++ b/apps/portal/src/features/checkout/hooks/useCheckout.ts
@@ -18,6 +18,7 @@ import { useActiveSubscriptions } from "@/features/subscriptions/hooks/useSubscr
 import {
   ORDER_TYPE,
   orderWithSkuValidationSchema,
+  prepareOrderFromCart,
   type CheckoutCart,
 } from "@customer-portal/domain/orders";
 import { CheckoutParamsService } from "@/features/checkout/services/checkout-params.service";
@@ -150,31 +151,15 @@ export function useCheckout() {
       // Debug logging to check cart contents
       console.log("[DEBUG] Cart data:", cart);
       console.log("[DEBUG] Cart items:", cart.items);
-      
-      const uniqueSkus = Array.from(
-        new Set(
-          cart.items
-            .map(item => item.sku)
-            .filter((sku): sku is string => typeof sku === "string" && sku.trim().length > 0)
-        )
-      );
-      
-      console.log("[DEBUG] Extracted SKUs from cart:", uniqueSkus);
-
-      if (uniqueSkus.length === 0) {
-        throw new Error("No products selected for order. Please go back and select products.");
-      }
 
       // Validate cart before submission
       await checkoutService.validateCart(cart);
 
-      const orderData = {
-        orderType,
-        skus: uniqueSkus,
-        ...(Object.keys(cart.configuration).length > 0
-          ? { configurations: cart.configuration }
-          : {}),
-      };
+      // Use domain helper to prepare order data
+      // This encapsulates SKU extraction and payload formatting
+      const orderData = prepareOrderFromCart(cart, orderType);
+      
+      console.log("[DEBUG] Extracted SKUs from cart:", orderData.skus);
 
       const currentUserId = useAuthStore.getState().user?.id;
       if (currentUserId) {
diff --git a/apps/portal/src/features/dashboard/utils/dashboard.utils.ts b/apps/portal/src/features/dashboard/utils/dashboard.utils.ts
index e39671af..74a2216b 100644
--- a/apps/portal/src/features/dashboard/utils/dashboard.utils.ts
+++ b/apps/portal/src/features/dashboard/utils/dashboard.utils.ts
@@ -6,58 +6,26 @@
 import {
   invoiceActivityMetadataSchema,
   serviceActivityMetadataSchema,
-  Activity,
-  ActivityFilter,
-  ActivityFilterConfig,
+  type Activity,
+  // Re-export business logic from domain
+  ACTIVITY_FILTERS,
+  filterActivities,
+  isActivityClickable,
+  generateDashboardTasks,
+  type DashboardTask,
+  type DashboardTaskSummary,
 } from "@customer-portal/domain/dashboard";
 import { formatCurrency as formatCurrencyUtil } from "@customer-portal/domain/toolkit";
 
-/**
- * Activity filter configurations
- */
-export const ACTIVITY_FILTERS: ActivityFilterConfig[] = [
-  { key: "all", label: "All" },
-  {
-    key: "billing",
-    label: "Billing",
-    types: ["invoice_created", "invoice_paid"],
-  },
-  {
-    key: "orders",
-    label: "Orders",
-    types: ["service_activated"],
-  },
-  {
-    key: "support",
-    label: "Support",
-    types: ["case_created", "case_closed"],
-  },
-];
-
-/**
- * Filter activities by type
- */
-export function filterActivities(activities: Activity[], filter: ActivityFilter): Activity[] {
-  if (filter === "all") {
-    return activities;
-  }
-
-  const filterConfig = ACTIVITY_FILTERS.find(f => f.key === filter);
-  if (!filterConfig?.types) {
-    return activities;
-  }
-
-  return activities.filter(activity => filterConfig.types!.includes(activity.type));
-}
-
-/**
- * Check if an activity is clickable (navigable)
- */
-export function isActivityClickable(activity: Activity): boolean {
-  const clickableTypes: Activity["type"][] = ["invoice_created", "invoice_paid"];
-
-  return clickableTypes.includes(activity.type) && !!activity.relatedId;
-}
+// Re-export domain business logic for backward compatibility
+export {
+  ACTIVITY_FILTERS,
+  filterActivities,
+  isActivityClickable,
+  generateDashboardTasks,
+  type DashboardTask,
+  type DashboardTaskSummary,
+};
 
 /**
  * Get navigation path for an activity
@@ -165,39 +133,6 @@ export function truncateText(text: string, maxLength = 28): string {
   return text.slice(0, Math.max(0, maxLength - 1)) + "…";
 }
 
-/**
- * Generate dashboard task suggestions based on summary data
- */
-export function generateDashboardTasks(summary: {
-  nextInvoice?: { id: number } | null;
-  stats?: { unpaidInvoices?: number; openCases?: number };
-}): Array<{ label: string; href: string }> {
-  const tasks: Array<{ label: string; href: string }> = [];
-
-  if (summary.nextInvoice) {
-    tasks.push({
-      label: "Pay upcoming invoice",
-      href: "#attention",
-    });
-  }
-
-  if (summary.stats?.unpaidInvoices && summary.stats.unpaidInvoices > 0) {
-    tasks.push({
-      label: "Review unpaid invoices",
-      href: "/billing/invoices",
-    });
-  }
-
-  if (summary.stats?.openCases && summary.stats.openCases > 0) {
-    tasks.push({
-      label: "Check support cases",
-      href: "/support/cases",
-    });
-  }
-
-  return tasks;
-}
-
 /**
  * Calculate dashboard loading progress
  */
diff --git a/apps/portal/src/features/sim-management/components/SimDetailsCard.tsx b/apps/portal/src/features/sim-management/components/SimDetailsCard.tsx
index f2c93401..21052552 100644
--- a/apps/portal/src/features/sim-management/components/SimDetailsCard.tsx
+++ b/apps/portal/src/features/sim-management/components/SimDetailsCard.tsx
@@ -10,6 +10,10 @@ import {
   ExclamationTriangleIcon,
   XCircleIcon,
 } from "@heroicons/react/24/outline";
+import type { SimDetails } from "@customer-portal/domain/sim";
+
+// Re-export for backwards compatibility
+export type { SimDetails };
 
 // Inline formatPlanShort function
 function formatPlanShort(planCode?: string): string {
@@ -26,33 +30,6 @@ function formatPlanShort(planCode?: string): string {
   return planCode;
 }
 
-export interface SimDetails {
-  account: string;
-  msisdn: string;
-  iccid?: string;
-  imsi?: string;
-  eid?: string;
-  planCode: string;
-  status: "active" | "suspended" | "cancelled" | "pending";
-  simType: "physical" | "esim";
-  size: "standard" | "nano" | "micro" | "esim";
-  hasVoice: boolean;
-  hasSms: boolean;
-  remainingQuotaKb: number;
-  remainingQuotaMb: number;
-  startDate?: string;
-  ipv4?: string;
-  ipv6?: string;
-  voiceMailEnabled?: boolean;
-  callWaitingEnabled?: boolean;
-  internationalRoamingEnabled?: boolean;
-  networkType?: string;
-  pendingOperations?: Array<{
-    operation: string;
-    scheduledDate: string;
-  }>;
-}
-
 interface SimDetailsCardProps {
   simDetails: SimDetails;
   isLoading?: boolean;
@@ -292,7 +269,7 @@ export function SimDetailsCard({
             <div>
               <h3 className="text-lg font-medium text-gray-900">Physical SIM Details</h3>
               <p className="text-sm text-gray-500">
-                {formatPlan(simDetails.planCode)} • {`${simDetails.size} SIM`}
+                {formatPlan(simDetails.planCode)} • {`${simDetails.simType} SIM`}
               </p>
             </div>
           </div>
@@ -321,12 +298,10 @@ export function SimDetailsCard({
                 <p className="text-sm font-medium text-gray-900">{simDetails.msisdn}</p>
               </div>
 
-              {simDetails.simType === "physical" && (
-                <div>
-                  <label className="text-xs text-gray-500">ICCID</label>
-                  <p className="text-sm font-mono text-gray-900 break-all">{simDetails.iccid}</p>
-                </div>
-              )}
+              <div>
+                <label className="text-xs text-gray-500">ICCID</label>
+                <p className="text-sm font-mono text-gray-900 break-all">{simDetails.iccid}</p>
+              </div>
 
               {simDetails.eid && (
                 <div>
@@ -342,10 +317,10 @@ export function SimDetailsCard({
                 </div>
               )}
 
-              {simDetails.startDate && (
+              {simDetails.activatedAt && (
                 <div>
                   <label className="text-xs text-gray-500">Service Start Date</label>
-                  <p className="text-sm text-gray-900">{formatDate(simDetails.startDate)}</p>
+                  <p className="text-sm text-gray-900">{formatDate(simDetails.activatedAt)}</p>
                 </div>
               )}
             </div>
@@ -368,37 +343,32 @@ export function SimDetailsCard({
                 <div className="flex items-center space-x-4">
                   <div className="flex items-center">
                     <SignalIcon
-                      className={`h-4 w-4 mr-1 ${simDetails.hasVoice ? "text-green-500" : "text-gray-400"}`}
+                      className={`h-4 w-4 mr-1 ${simDetails.voiceMailEnabled ? "text-green-500" : "text-gray-400"}`}
                     />
                     <span
-                      className={`text-sm ${simDetails.hasVoice ? "text-green-600" : "text-gray-500"}`}
+                      className={`text-sm ${simDetails.voiceMailEnabled ? "text-green-600" : "text-gray-500"}`}
                     >
-                      Voice {simDetails.hasVoice ? "Enabled" : "Disabled"}
+                      Voicemail {simDetails.voiceMailEnabled ? "Enabled" : "Disabled"}
                     </span>
                   </div>
                   <div className="flex items-center">
                     <DevicePhoneMobileIcon
-                      className={`h-4 w-4 mr-1 ${simDetails.hasSms ? "text-green-500" : "text-gray-400"}`}
+                      className={`h-4 w-4 mr-1 ${simDetails.callWaitingEnabled ? "text-green-500" : "text-gray-400"}`}
                     />
                     <span
-                      className={`text-sm ${simDetails.hasSms ? "text-green-600" : "text-gray-500"}`}
+                      className={`text-sm ${simDetails.callWaitingEnabled ? "text-green-600" : "text-gray-500"}`}
                     >
-                      SMS {simDetails.hasSms ? "Enabled" : "Disabled"}
+                      Call Waiting {simDetails.callWaitingEnabled ? "Enabled" : "Disabled"}
                     </span>
                   </div>
                 </div>
 
-                {(simDetails.ipv4 || simDetails.ipv6) && (
-                  <div>
-                    <label className="text-xs text-gray-500">IP Address</label>
-                    <div className="space-y-1">
-                      {simDetails.ipv4 && (
-                        <p className="text-sm font-mono text-gray-900">IPv4: {simDetails.ipv4}</p>
-                      )}
-                      {simDetails.ipv6 && (
-                        <p className="text-sm font-mono text-gray-900">IPv6: {simDetails.ipv6}</p>
-                      )}
-                    </div>
+                {simDetails.internationalRoamingEnabled && (
+                  <div className="flex items-center">
+                    <WifiIcon className="h-4 w-4 mr-1 text-green-500" />
+                    <span className="text-sm text-green-600">
+                      International Roaming Enabled
+                    </span>
                   </div>
                 )}
               </div>
@@ -406,21 +376,14 @@ export function SimDetailsCard({
           )}
         </div>
 
-        {/* Pending Operations */}
-        {simDetails.pendingOperations && simDetails.pendingOperations.length > 0 && (
+        {/* Expiry Date */}
+        {simDetails.expiresAt && (
           <div className="mt-6 pt-6 border-t border-gray-200">
-            <h4 className="text-sm font-medium text-gray-500 uppercase tracking-wider mb-3">
-              Pending Operations
-            </h4>
-            <div className="bg-blue-50 rounded-lg p-4">
-              {simDetails.pendingOperations.map((operation, index) => (
-                <div key={index} className="flex items-center text-sm">
-                  <ClockIcon className="h-4 w-4 text-blue-500 mr-2" />
-                  <span className="text-blue-800">
-                    {operation.operation} scheduled for {formatDate(operation.scheduledDate)}
-                  </span>
-                </div>
-              ))}
+            <div className="flex items-center text-sm">
+              <ClockIcon className="h-4 w-4 text-amber-500 mr-2" />
+              <span className="text-amber-800">
+                Expires on {formatDate(simDetails.expiresAt)}
+              </span>
             </div>
           </div>
         )}
diff --git a/apps/portal/src/features/sim-management/components/SimManagementSection.tsx b/apps/portal/src/features/sim-management/components/SimManagementSection.tsx
index 29eafeac..62b6a395 100644
--- a/apps/portal/src/features/sim-management/components/SimManagementSection.tsx
+++ b/apps/portal/src/features/sim-management/components/SimManagementSection.tsx
@@ -232,10 +232,10 @@ export function SimManagementSection({ subscriptionId }: SimManagementSectionPro
                 </p>
                 <button
                   onClick={handlePayInvoice}
-                  disabled={createSsoLink.isPending || latestInvoice.status === 'paid'}
+                  disabled={createSsoLink.isPending || latestInvoice.status === 'Paid'}
                   className="w-full px-4 py-2 bg-blue-600 text-white text-sm font-semibold rounded-lg hover:bg-blue-700 disabled:bg-gray-400 disabled:cursor-not-allowed transition-colors"
                 >
-                  {latestInvoice.status === 'paid' ? 'PAID' : createSsoLink.isPending ? 'Loading...' : 'PAY'}
+                  {latestInvoice.status === 'Paid' ? 'PAID' : createSsoLink.isPending ? 'Loading...' : 'PAY'}
                 </button>
               </div>
             )}
diff --git a/apps/portal/src/features/subscriptions/services/sim-actions.service.ts b/apps/portal/src/features/subscriptions/services/sim-actions.service.ts
index b4f7b1f8..a5b0e377 100644
--- a/apps/portal/src/features/subscriptions/services/sim-actions.service.ts
+++ b/apps/portal/src/features/subscriptions/services/sim-actions.service.ts
@@ -4,6 +4,7 @@ import type {
   SimTopUpRequest,
   SimPlanChangeRequest,
   SimCancelRequest,
+  SimReissueRequest,
 } from "@customer-portal/domain/sim";
 
 // Types imported from domain - no duplication
diff --git a/apps/portal/src/features/support/hooks/useCreateCase.ts b/apps/portal/src/features/support/hooks/useCreateCase.ts
new file mode 100644
index 00000000..25cb6329
--- /dev/null
+++ b/apps/portal/src/features/support/hooks/useCreateCase.ts
@@ -0,0 +1,28 @@
+"use client";
+
+import { useMutation, useQueryClient } from "@tanstack/react-query";
+import { apiClient, queryKeys } from "@/lib/api";
+import type { CreateCaseRequest, CreateCaseResponse } from "@customer-portal/domain/support";
+
+export function useCreateCase() {
+  const queryClient = useQueryClient();
+
+  return useMutation<CreateCaseResponse, Error, CreateCaseRequest>({
+    mutationFn: async (data: CreateCaseRequest) => {
+      const response = await apiClient.POST<CreateCaseResponse>("/api/support/cases", {
+        body: data,
+      });
+
+      if (!response.data) {
+        throw new Error("Failed to create support case");
+      }
+
+      return response.data;
+    },
+    onSuccess: () => {
+      // Invalidate cases list to refetch
+      void queryClient.invalidateQueries({ queryKey: queryKeys.support.cases() });
+    },
+  });
+}
+
diff --git a/apps/portal/src/features/support/hooks/useSupportCase.ts b/apps/portal/src/features/support/hooks/useSupportCase.ts
new file mode 100644
index 00000000..fcbc4f5c
--- /dev/null
+++ b/apps/portal/src/features/support/hooks/useSupportCase.ts
@@ -0,0 +1,21 @@
+"use client";
+
+import { useQuery } from "@tanstack/react-query";
+import { useAuthSession } from "@/features/auth/services/auth.store";
+import { apiClient, getDataOrThrow, queryKeys } from "@/lib/api";
+import type { SupportCase } from "@customer-portal/domain/support";
+
+export function useSupportCase(caseId: string | undefined) {
+  const { isAuthenticated } = useAuthSession();
+
+  return useQuery<SupportCase>({
+    queryKey: queryKeys.support.case(caseId ?? ""),
+    queryFn: async () => {
+      const response = await apiClient.GET<SupportCase>(`/api/support/cases/${caseId}`);
+      return getDataOrThrow(response, "Failed to load support case");
+    },
+    enabled: isAuthenticated && !!caseId,
+    staleTime: 60 * 1000,
+  });
+}
+
diff --git a/apps/portal/src/features/support/utils/case-presenters.tsx b/apps/portal/src/features/support/utils/case-presenters.tsx
new file mode 100644
index 00000000..9ed765f7
--- /dev/null
+++ b/apps/portal/src/features/support/utils/case-presenters.tsx
@@ -0,0 +1,152 @@
+import type { ReactNode } from "react";
+import {
+  CheckCircleIcon,
+  ClockIcon,
+  ExclamationTriangleIcon,
+  ChatBubbleLeftRightIcon,
+  SparklesIcon,
+} from "@heroicons/react/24/outline";
+import {
+  SUPPORT_CASE_STATUS,
+  SUPPORT_CASE_PRIORITY,
+  type SupportCaseStatus,
+  type SupportCasePriority,
+} from "@customer-portal/domain/support";
+
+/**
+ * Status variant types for styling
+ */
+export type CaseStatusVariant = "success" | "info" | "warning" | "neutral" | "purple";
+export type CasePriorityVariant = "high" | "medium" | "low" | "neutral";
+
+/**
+ * Icon size options
+ */
+export type IconSize = "sm" | "md";
+
+const ICON_SIZE_CLASSES: Record<IconSize, string> = {
+  sm: "h-5 w-5",
+  md: "h-6 w-6",
+};
+
+/**
+ * Status to icon mapping
+ */
+const STATUS_ICON_MAP: Record<string, (className: string) => ReactNode> = {
+  [SUPPORT_CASE_STATUS.RESOLVED]: (cls) => <CheckCircleIcon className={`${cls} text-green-500`} />,
+  [SUPPORT_CASE_STATUS.CLOSED]: (cls) => <CheckCircleIcon className={`${cls} text-green-500`} />,
+  [SUPPORT_CASE_STATUS.VPN_PENDING]: (cls) => <CheckCircleIcon className={`${cls} text-green-500`} />,
+  [SUPPORT_CASE_STATUS.PENDING]: (cls) => <CheckCircleIcon className={`${cls} text-green-500`} />,
+  [SUPPORT_CASE_STATUS.IN_PROGRESS]: (cls) => <ClockIcon className={`${cls} text-blue-500`} />,
+  [SUPPORT_CASE_STATUS.AWAITING_APPROVAL]: (cls) => <ExclamationTriangleIcon className={`${cls} text-amber-500`} />,
+  [SUPPORT_CASE_STATUS.NEW]: (cls) => <SparklesIcon className={`${cls} text-purple-500`} />,
+};
+
+/**
+ * Status to variant mapping
+ */
+const STATUS_VARIANT_MAP: Record<string, CaseStatusVariant> = {
+  [SUPPORT_CASE_STATUS.RESOLVED]: "success",
+  [SUPPORT_CASE_STATUS.CLOSED]: "success",
+  [SUPPORT_CASE_STATUS.VPN_PENDING]: "success",
+  [SUPPORT_CASE_STATUS.PENDING]: "success",
+  [SUPPORT_CASE_STATUS.IN_PROGRESS]: "info",
+  [SUPPORT_CASE_STATUS.AWAITING_APPROVAL]: "warning",
+  [SUPPORT_CASE_STATUS.NEW]: "purple",
+};
+
+/**
+ * Priority to variant mapping
+ */
+const PRIORITY_VARIANT_MAP: Record<string, CasePriorityVariant> = {
+  [SUPPORT_CASE_PRIORITY.HIGH]: "high",
+  [SUPPORT_CASE_PRIORITY.MEDIUM]: "medium",
+  [SUPPORT_CASE_PRIORITY.LOW]: "low",
+};
+
+/**
+ * Tailwind class mappings for status variants
+ */
+const STATUS_CLASSES: Record<CaseStatusVariant, string> = {
+  success: "text-green-700 bg-green-50",
+  info: "text-blue-700 bg-blue-50",
+  warning: "text-amber-700 bg-amber-50",
+  purple: "text-purple-700 bg-purple-50",
+  neutral: "text-gray-700 bg-gray-50",
+};
+
+/**
+ * Tailwind class mappings for status variants with border
+ */
+const STATUS_CLASSES_WITH_BORDER: Record<CaseStatusVariant, string> = {
+  success: "text-green-700 bg-green-50 border-green-200",
+  info: "text-blue-700 bg-blue-50 border-blue-200",
+  warning: "text-amber-700 bg-amber-50 border-amber-200",
+  purple: "text-purple-700 bg-purple-50 border-purple-200",
+  neutral: "text-gray-700 bg-gray-50 border-gray-200",
+};
+
+/**
+ * Tailwind class mappings for priority variants
+ */
+const PRIORITY_CLASSES: Record<CasePriorityVariant, string> = {
+  high: "text-red-700 bg-red-50",
+  medium: "text-amber-700 bg-amber-50",
+  low: "text-green-700 bg-green-50",
+  neutral: "text-gray-700 bg-gray-50",
+};
+
+/**
+ * Tailwind class mappings for priority variants with border
+ */
+const PRIORITY_CLASSES_WITH_BORDER: Record<CasePriorityVariant, string> = {
+  high: "text-red-700 bg-red-50 border-red-200",
+  medium: "text-amber-700 bg-amber-50 border-amber-200",
+  low: "text-green-700 bg-green-50 border-green-200",
+  neutral: "text-gray-700 bg-gray-50 border-gray-200",
+};
+
+/**
+ * Get the icon component for a case status
+ */
+export function getCaseStatusIcon(status: string, size: IconSize = "sm"): ReactNode {
+  const sizeClass = ICON_SIZE_CLASSES[size];
+  const iconFn = STATUS_ICON_MAP[status];
+  
+  if (iconFn) {
+    return iconFn(sizeClass);
+  }
+  
+  return <ChatBubbleLeftRightIcon className={`${sizeClass} text-gray-400`} />;
+}
+
+/**
+ * Get the variant type for a case status
+ */
+export function getCaseStatusVariant(status: string): CaseStatusVariant {
+  return STATUS_VARIANT_MAP[status] ?? "neutral";
+}
+
+/**
+ * Get Tailwind classes for a case status
+ */
+export function getCaseStatusClasses(status: string, withBorder = false): string {
+  const variant = getCaseStatusVariant(status);
+  return withBorder ? STATUS_CLASSES_WITH_BORDER[variant] : STATUS_CLASSES[variant];
+}
+
+/**
+ * Get the variant type for a case priority
+ */
+export function getCasePriorityVariant(priority: string): CasePriorityVariant {
+  return PRIORITY_VARIANT_MAP[priority] ?? "neutral";
+}
+
+/**
+ * Get Tailwind classes for a case priority
+ */
+export function getCasePriorityClasses(priority: string, withBorder = false): string {
+  const variant = getCasePriorityVariant(priority);
+  return withBorder ? PRIORITY_CLASSES_WITH_BORDER[variant] : PRIORITY_CLASSES[variant];
+}
+
diff --git a/apps/portal/src/features/support/utils/index.ts b/apps/portal/src/features/support/utils/index.ts
new file mode 100644
index 00000000..9c9de8bf
--- /dev/null
+++ b/apps/portal/src/features/support/utils/index.ts
@@ -0,0 +1,2 @@
+export * from "./case-presenters";
+
diff --git a/apps/portal/src/features/support/views/NewSupportCaseView.tsx b/apps/portal/src/features/support/views/NewSupportCaseView.tsx
index e4189317..eac048d5 100644
--- a/apps/portal/src/features/support/views/NewSupportCaseView.tsx
+++ b/apps/portal/src/features/support/views/NewSupportCaseView.tsx
@@ -4,41 +4,47 @@ import { useState, type FormEvent } from "react";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
 import {
-  ArrowLeftIcon,
   PaperAirplaneIcon,
-  ExclamationCircleIcon,
-  InformationCircleIcon,
+  SparklesIcon,
+  ChatBubbleLeftRightIcon,
 } from "@heroicons/react/24/outline";
+import { TicketIcon as TicketIconSolid } from "@heroicons/react/24/solid";
 
-import { logger } from "@/lib/logger";
+import { PageLayout } from "@/components/templates/PageLayout";
+import { AnimatedCard } from "@/components/molecules";
+import { AlertBanner } from "@/components/molecules/AlertBanner/AlertBanner";
+import { Button } from "@/components/atoms";
+import { useCreateCase } from "@/features/support/hooks/useCreateCase";
+import {
+  SUPPORT_CASE_PRIORITY,
+  type SupportCasePriority,
+} from "@customer-portal/domain/support";
 
 export function NewSupportCaseView() {
   const router = useRouter();
-  const [isSubmitting, setIsSubmitting] = useState(false);
+  const createCaseMutation = useCreateCase();
+  const [error, setError] = useState<string | null>(null);
   const [formData, setFormData] = useState({
     subject: "",
-    category: "Technical",
-    priority: "Medium",
+    priority: SUPPORT_CASE_PRIORITY.MEDIUM as SupportCasePriority,
     description: "",
   });
 
-  const handleSubmit = (event: FormEvent) => {
+  const handleSubmit = async (event: FormEvent) => {
     event.preventDefault();
-    setIsSubmitting(true);
+    setError(null);
 
-    // Mock submission - would normally send to API
-    void (async () => {
-      try {
-        await new Promise(resolve => setTimeout(resolve, 2000));
+    try {
+      await createCaseMutation.mutateAsync({
+        subject: formData.subject.trim(),
+        description: formData.description.trim(),
+        priority: formData.priority,
+      });
 
-        // Redirect to cases list with success message
-        router.push("/support/cases?created=true");
-      } catch (error) {
-        logger.error("Error creating case", error);
-      } finally {
-        setIsSubmitting(false);
-      }
-    })();
+      router.push("/support/cases?created=true");
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Failed to create support case");
+    }
   };
 
   const handleInputChange = (field: string, value: string) => {
@@ -50,198 +56,194 @@ export function NewSupportCaseView() {
 
   const isFormValid = formData.subject.trim() && formData.description.trim();
 
+  const priorityOptions = [
+    { value: SUPPORT_CASE_PRIORITY.LOW, label: "Low - General question" },
+    { value: SUPPORT_CASE_PRIORITY.MEDIUM, label: "Medium - Issue affecting work" },
+    { value: SUPPORT_CASE_PRIORITY.HIGH, label: "High - Urgent / Service disruption" },
+  ];
+
   return (
-    <div className="py-6">
-      <div className="max-w-4xl mx-auto px-4 sm:px-6 md:px-8">
-        {/* Header */}
-        <div className="mb-8">
-          <div className="flex items-center space-x-4 mb-4">
-            <button
-              onClick={() => router.back()}
-              className="inline-flex items-center text-sm text-gray-500 hover:text-gray-700"
-            >
-              <ArrowLeftIcon className="h-4 w-4 mr-1" />
-              Back to Support
-            </button>
-          </div>
-
-          <div>
-            <h1 className="text-2xl font-bold text-gray-900">Create Support Case</h1>
-            <p className="mt-1 text-sm text-gray-600">Get help from our support team</p>
-          </div>
-        </div>
-
-        {/* Help Tips */}
-        <div className="bg-blue-50 border border-blue-200 rounded-lg p-4 mb-6">
-          <div className="flex">
+    <PageLayout
+      icon={<TicketIconSolid />}
+      title="Create Support Case"
+      description="Get help from our support team"
+      breadcrumbs={[
+        { label: "Support", href: "/support" },
+        { label: "Create Case" },
+      ]}
+    >
+      {/* AI Chat Suggestion */}
+      <AnimatedCard className="overflow-hidden" variant="highlighted">
+        <div className="bg-gradient-to-r from-blue-600 to-blue-700 p-5">
+          <div className="flex flex-col sm:flex-row sm:items-center gap-4">
             <div className="flex-shrink-0">
-              <InformationCircleIcon className="h-5 w-5 text-blue-400" />
-            </div>
-            <div className="ml-3">
-              <h3 className="text-sm font-medium text-blue-800">Before creating a case</h3>
-              <div className="mt-2 text-sm text-blue-700">
-                <ul className="list-disc list-inside space-y-1">
-                  <li>Check our knowledge base for common solutions</li>
-                  <li>Include relevant error messages or screenshots</li>
-                  <li>Provide detailed steps to reproduce the issue</li>
-                  <li>Mention your service or subscription if applicable</li>
-                </ul>
+              <div className="w-12 h-12 bg-white/20 rounded-xl flex items-center justify-center backdrop-blur-sm">
+                <SparklesIcon className="h-6 w-6 text-white" />
               </div>
             </div>
+            <div className="flex-1 min-w-0">
+              <h3 className="text-lg font-semibold text-white mb-1">
+                Try our AI Assistant first
+              </h3>
+              <p className="text-blue-100 text-sm">
+                Get instant answers to common questions. If the AI can&apos;t help, it will create
+                a case for you automatically.
+              </p>
+            </div>
+            <Button
+              className="w-full sm:w-auto bg-white text-blue-600 hover:bg-blue-50"
+              leftIcon={<ChatBubbleLeftRightIcon className="h-5 w-5" />}
+            >
+              Start Chat
+            </Button>
           </div>
         </div>
+      </AnimatedCard>
 
-        {/* Form */}
-        <div className="bg-white shadow rounded-lg">
-          <form onSubmit={handleSubmit} className="p-6 space-y-6">
-            {/* Subject */}
-            <div>
-              <label htmlFor="subject" className="block text-sm font-medium text-gray-700 mb-2">
-                Subject *
-              </label>
-              <input
-                type="text"
-                id="subject"
-                value={formData.subject}
-                onChange={event => handleInputChange("subject", event.target.value)}
-                placeholder="Brief description of your issue"
-                className="block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm placeholder-gray-400 focus:outline-none focus:ring-blue-500 focus:border-blue-500"
-                required
-              />
-            </div>
+      {/* Error Message */}
+      {error && (
+        <AlertBanner variant="error" title="Error creating case" elevated>
+          {error}
+        </AlertBanner>
+      )}
 
-            {/* Category and Priority */}
-            <div className="grid grid-cols-1 gap-6 sm:grid-cols-2">
-              <div>
-                <label htmlFor="category" className="block text-sm font-medium text-gray-700 mb-2">
-                  Category
-                </label>
-                <select
-                  id="category"
-                  value={formData.category}
-                  onChange={event => handleInputChange("category", event.target.value)}
-                  className="block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500"
-                >
-                  <option value="Technical">Technical Support</option>
-                  <option value="Billing">Billing Question</option>
-                  <option value="General">General Inquiry</option>
-                  <option value="Feature Request">Feature Request</option>
-                  <option value="Bug Report">Bug Report</option>
-                </select>
-              </div>
-
-              <div>
-                <label htmlFor="priority" className="block text-sm font-medium text-gray-700 mb-2">
-                  Priority
-                </label>
-                <select
-                  id="priority"
-                  value={formData.priority}
-                  onChange={event => handleInputChange("priority", event.target.value)}
-                  className="block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-blue-500 focus:border-blue-500"
-                >
-                  <option value="Low">Low - General question</option>
-                  <option value="Medium">Medium - Issue affecting work</option>
-                  <option value="High">High - Service disruption</option>
-                  <option value="Critical">Critical - Complete outage</option>
-                </select>
-              </div>
-            </div>
-
-            {/* Description */}
-            <div>
-              <label htmlFor="description" className="block text-sm font-medium text-gray-700 mb-2">
-                Description *
-              </label>
-              <textarea
-                id="description"
-                rows={6}
-                value={formData.description}
-                onChange={event => handleInputChange("description", event.target.value)}
-                placeholder="Please provide a detailed description of your issue, including any error messages and steps to reproduce the problem..."
-                className="block w-full px-3 py-2 border border-gray-300 rounded-md shadow-sm placeholder-gray-400 focus:outline-none focus:ring-blue-500 focus:border-blue-500"
-                required
-              />
-              <p className="mt-2 text-xs text-gray-500">
-                The more details you provide, the faster we can help you.
-              </p>
-            </div>
-
-            {/* Priority Warning */}
-            {formData.priority === "Critical" && (
-              <div className="bg-red-50 border border-red-200 rounded-lg p-4">
-                <div className="flex">
-                  <div className="flex-shrink-0">
-                    <ExclamationCircleIcon className="h-5 w-5 text-red-400" />
-                  </div>
-                  <div className="ml-3">
-                    <h3 className="text-sm font-medium text-red-800">Critical Priority Selected</h3>
-                    <div className="mt-2 text-sm text-red-700">
-                      <p>
-                        Critical priority should only be used for complete service outages. For
-                        urgent issues that aren&apos;t complete outages, please use High priority.
-                      </p>
-                    </div>
-                  </div>
-                </div>
-              </div>
-            )}
-
-            {/* Actions */}
-            <div className="flex items-center justify-between pt-6 border-t border-gray-200">
-              <button
-                type="button"
-                onClick={() => router.back()}
-                className="inline-flex items-center px-4 py-2 border border-gray-300 text-sm font-medium rounded-md text-gray-700 bg-white hover:bg-gray-50"
-              >
-                Cancel
-              </button>
-              <button
-                type="submit"
-                disabled={!isFormValid || isSubmitting}
-                className="inline-flex items-center px-6 py-2 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700 disabled:bg-gray-300 disabled:cursor-not-allowed"
-              >
-                {isSubmitting ? (
-                  <>
-                    <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-white mr-2"></div>
-                    Creating Case...
-                  </>
-                ) : (
-                  <>
-                    <PaperAirplaneIcon className="h-4 w-4 mr-2" />
-                    Create Case
-                  </>
-                )}
-              </button>
-            </div>
-          </form>
-        </div>
-
-        {/* Additional Help */}
-        <div className="mt-8 bg-gray-50 rounded-lg p-6">
-          <h3 className="text-lg font-medium text-gray-900 mb-4">Need immediate help?</h3>
-          <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
-            <div>
-              <h4 className="text-sm font-medium text-gray-900">Phone Support</h4>
-              <p className="text-sm text-gray-600 mt-1">
-                9:30-18:00 JST
-                <br />
-                <span className="font-medium text-blue-600">0120-660-470</span>
-              </p>
-            </div>
-            <div>
-              <h4 className="text-sm font-medium text-gray-900">Knowledge Base</h4>
-              <p className="text-sm text-gray-600 mt-1">
-                Search our help articles for quick solutions
-                <br />
-                <Link href="/support/kb" className="font-medium text-blue-600 hover:text-blue-500">
-                  Browse Knowledge Base
-                </Link>
-              </p>
-            </div>
+      {/* Form */}
+      <AnimatedCard variant="static">
+        <form onSubmit={handleSubmit} className="p-6 space-y-6">
+          {/* Subject */}
+          <div>
+            <label htmlFor="subject" className="block text-sm font-medium text-gray-900 mb-2">
+              Subject <span className="text-red-500">*</span>
+            </label>
+            <input
+              type="text"
+              id="subject"
+              value={formData.subject}
+              onChange={event => handleInputChange("subject", event.target.value)}
+              placeholder="Brief description of your issue"
+              className="block w-full px-4 py-3 border border-gray-300 rounded-xl text-sm bg-white placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-all"
+              maxLength={255}
+              required
+            />
           </div>
+
+          {/* Priority */}
+          <div>
+            <label htmlFor="priority" className="block text-sm font-medium text-gray-900 mb-2">
+              Priority
+            </label>
+            <select
+              id="priority"
+              value={formData.priority}
+              onChange={event => handleInputChange("priority", event.target.value)}
+              className="block w-full sm:w-1/2 px-4 py-3 border border-gray-300 rounded-xl text-sm bg-white focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-all"
+            >
+              {priorityOptions.map(option => (
+                <option key={option.value} value={option.value}>
+                  {option.label}
+                </option>
+              ))}
+            </select>
+          </div>
+
+          {/* Description */}
+          <div>
+            <label htmlFor="description" className="block text-sm font-medium text-gray-900 mb-2">
+              Description <span className="text-red-500">*</span>
+            </label>
+            <textarea
+              id="description"
+              rows={6}
+              value={formData.description}
+              onChange={event => handleInputChange("description", event.target.value)}
+              placeholder="Please provide a detailed description of your issue, including any error messages and steps to reproduce the problem..."
+              className="block w-full px-4 py-3 border border-gray-300 rounded-xl text-sm bg-white placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent transition-all resize-none"
+              required
+            />
+            <p className="mt-2 text-xs text-gray-500">
+              The more details you provide, the faster we can help you.
+            </p>
+          </div>
+
+          {/* Actions */}
+          <div className="flex flex-col-reverse sm:flex-row items-center justify-between gap-4 pt-4 border-t border-gray-100">
+            <Link
+              href="/support"
+              className="text-sm text-gray-600 hover:text-gray-900 font-medium"
+            >
+              Cancel
+            </Link>
+            <Button
+              type="submit"
+              disabled={!isFormValid || createCaseMutation.isPending}
+              loading={createCaseMutation.isPending}
+              loadingText="Creating Case..."
+              leftIcon={<PaperAirplaneIcon className="h-4 w-4" />}
+              size="lg"
+            >
+              Create Case
+            </Button>
+          </div>
+        </form>
+      </AnimatedCard>
+
+      {/* Contact Options */}
+      <AnimatedCard className="overflow-hidden" variant="static">
+        <div className="p-5 border-b border-gray-100">
+          <h3 className="text-base font-semibold text-gray-900">Need immediate assistance?</h3>
+          <p className="text-sm text-gray-500 mt-1">Contact us directly for urgent matters</p>
         </div>
-      </div>
-    </div>
+        <div className="grid grid-cols-1 sm:grid-cols-2 divide-y sm:divide-y-0 sm:divide-x divide-gray-100">
+          {/* Phone Support */}
+          <a
+            href="tel:0120660470"
+            className="group flex items-center gap-4 p-5 hover:bg-gray-50 transition-colors"
+          >
+            <div className="w-12 h-12 bg-gradient-to-br from-emerald-500 to-emerald-600 rounded-xl flex items-center justify-center flex-shrink-0 shadow-sm group-hover:scale-105 transition-transform">
+              <svg className="h-6 w-6 text-white" fill="none" viewBox="0 0 24 24" strokeWidth={1.5} stroke="currentColor">
+                <path strokeLinecap="round" strokeLinejoin="round" d="M2.25 6.75c0 8.284 6.716 15 15 15h2.25a2.25 2.25 0 0 0 2.25-2.25v-1.372c0-.516-.351-.966-.852-1.091l-4.423-1.106c-.44-.11-.902.055-1.173.417l-.97 1.293c-.282.376-.769.542-1.21.38a12.035 12.035 0 0 1-7.143-7.143c-.162-.441.004-.928.38-1.21l1.293-.97c.363-.271.527-.734.417-1.173L6.963 3.102a1.125 1.125 0 0 0-1.091-.852H4.5A2.25 2.25 0 0 0 2.25 4.5v2.25Z" />
+              </svg>
+            </div>
+            <div className="flex-1 min-w-0">
+              <p className="text-sm font-semibold text-gray-900 group-hover:text-emerald-600 transition-colors">
+                Phone Support
+              </p>
+              <p className="text-2xl font-bold text-gray-900 mt-0.5">0120-660-470</p>
+              <p className="text-xs text-gray-500 mt-1 flex items-center gap-1.5">
+                <span className="w-1.5 h-1.5 bg-emerald-500 rounded-full"></span>
+                Mon-Fri, 9:30-18:00 JST
+              </p>
+            </div>
+          </a>
+
+          {/* AI Chat */}
+          <button
+            type="button"
+            className="group flex items-center gap-4 p-5 hover:bg-gray-50 transition-colors text-left w-full"
+          >
+            <div className="w-12 h-12 bg-gradient-to-br from-blue-500 to-blue-600 rounded-xl flex items-center justify-center flex-shrink-0 shadow-sm group-hover:scale-105 transition-transform">
+              <SparklesIcon className="h-6 w-6 text-white" />
+            </div>
+            <div className="flex-1 min-w-0">
+              <p className="text-sm font-semibold text-gray-900 group-hover:text-blue-600 transition-colors">
+                AI Chat Assistant
+              </p>
+              <p className="text-lg font-semibold text-gray-900 mt-0.5">Get instant answers</p>
+              <p className="text-xs text-gray-500 mt-1 flex items-center gap-1.5">
+                <span className="w-1.5 h-1.5 bg-blue-500 rounded-full animate-pulse"></span>
+                Available 24/7
+              </p>
+            </div>
+            <div className="flex-shrink-0">
+              <span className="inline-flex items-center justify-center w-8 h-8 rounded-full bg-blue-100 text-blue-600 group-hover:bg-blue-600 group-hover:text-white transition-colors">
+                <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" strokeWidth={2} stroke="currentColor">
+                  <path strokeLinecap="round" strokeLinejoin="round" d="M8.25 4.5l7.5 7.5-7.5 7.5" />
+                </svg>
+              </span>
+            </div>
+          </button>
+        </div>
+      </AnimatedCard>
+    </PageLayout>
   );
 }
diff --git a/apps/portal/src/features/support/views/SupportCaseDetailView.tsx b/apps/portal/src/features/support/views/SupportCaseDetailView.tsx
new file mode 100644
index 00000000..325285e9
--- /dev/null
+++ b/apps/portal/src/features/support/views/SupportCaseDetailView.tsx
@@ -0,0 +1,161 @@
+"use client";
+
+import {
+  CalendarIcon,
+  ClockIcon,
+  TagIcon,
+  ArrowLeftIcon,
+} from "@heroicons/react/24/outline";
+import { TicketIcon as TicketIconSolid } from "@heroicons/react/24/solid";
+import { format, formatDistanceToNow } from "date-fns";
+import { PageLayout } from "@/components/templates/PageLayout";
+import { AnimatedCard } from "@/components/molecules";
+import { AlertBanner } from "@/components/molecules/AlertBanner/AlertBanner";
+import { Button } from "@/components/atoms";
+import { useSupportCase } from "@/features/support/hooks/useSupportCase";
+import {
+  getCaseStatusIcon,
+  getCaseStatusClasses,
+  getCasePriorityClasses,
+} from "@/features/support/utils";
+
+interface SupportCaseDetailViewProps {
+  caseId: string;
+}
+
+export function SupportCaseDetailView({ caseId }: SupportCaseDetailViewProps) {
+  const { data: supportCase, isLoading, error, refetch } = useSupportCase(caseId);
+
+  if (!isLoading && !supportCase && !error) {
+    return (
+      <PageLayout
+        icon={<TicketIconSolid />}
+        title="Case Not Found"
+        breadcrumbs={[
+          { label: "Support", href: "/support" },
+          { label: "Cases", href: "/support/cases" },
+          { label: "Not Found" },
+        ]}
+      >
+        <AlertBanner variant="error" title="Case not found">
+          The support case you&apos;re looking for could not be found or you don&apos;t have
+          permission to view it.
+        </AlertBanner>
+      </PageLayout>
+    );
+  }
+
+  return (
+    <PageLayout
+      icon={<TicketIconSolid />}
+      title={supportCase ? `Case #${supportCase.caseNumber}` : "Loading..."}
+      description={supportCase?.subject}
+      loading={isLoading}
+      error={error}
+      onRetry={() => void refetch()}
+      breadcrumbs={[
+        { label: "Support", href: "/support" },
+        { label: "Cases", href: "/support/cases" },
+        { label: supportCase ? `#${supportCase.caseNumber}` : "..." },
+      ]}
+      actions={
+        <Button
+          as="a"
+          href="/support/cases"
+          variant="outline"
+          leftIcon={<ArrowLeftIcon className="h-4 w-4" />}
+        >
+          All Cases
+        </Button>
+      }
+    >
+      {supportCase && (
+        <div className="space-y-6">
+          {/* Header Card - Status & Key Info */}
+          <div className="border border-gray-200 rounded-xl bg-white overflow-hidden">
+            {/* Top Section - Status and Priority */}
+            <div className="p-5 border-b border-gray-100">
+              <div className="flex flex-col sm:flex-row sm:items-start sm:justify-between gap-4">
+                <div className="flex items-start gap-3">
+                  <div className="mt-0.5">
+                    {getCaseStatusIcon(supportCase.status, "md")}
+                  </div>
+                  <div>
+                    <h2 className="text-lg font-semibold text-gray-900 leading-snug">
+                      {supportCase.subject}
+                    </h2>
+                    <p className="text-sm text-gray-500 mt-0.5">
+                      Case #{supportCase.caseNumber}
+                    </p>
+                  </div>
+                </div>
+                <div className="flex flex-wrap gap-2">
+                  <span
+                    className={`inline-flex items-center px-3 py-1 rounded-lg text-sm font-medium ${getCaseStatusClasses(supportCase.status)}`}
+                  >
+                    {supportCase.status}
+                  </span>
+                  <span
+                    className={`inline-flex items-center px-3 py-1 rounded-lg text-sm font-medium ${getCasePriorityClasses(supportCase.priority)}`}
+                  >
+                    {supportCase.priority}
+                  </span>
+                </div>
+              </div>
+            </div>
+
+            {/* Meta Info Row */}
+            <div className="px-5 py-3 bg-gray-50/50 flex flex-wrap items-center gap-x-6 gap-y-2 text-sm">
+              <div className="flex items-center gap-2 text-gray-600">
+                <CalendarIcon className="h-4 w-4 text-gray-400" />
+                <span>Created {format(new Date(supportCase.createdAt), "MMM d, yyyy")}</span>
+              </div>
+              <div className="flex items-center gap-2 text-gray-600">
+                <ClockIcon className="h-4 w-4 text-gray-400" />
+                <span>Updated {formatDistanceToNow(new Date(supportCase.updatedAt), { addSuffix: true })}</span>
+              </div>
+              {supportCase.category && (
+                <div className="flex items-center gap-2 text-gray-600">
+                  <TagIcon className="h-4 w-4 text-gray-400" />
+                  <span>{supportCase.category}</span>
+                </div>
+              )}
+              {supportCase.closedAt && (
+                <div className="flex items-center gap-2 text-green-600">
+                  <span>✓ Closed {format(new Date(supportCase.closedAt), "MMM d, yyyy")}</span>
+                </div>
+              )}
+            </div>
+          </div>
+
+          {/* Description */}
+          <div className="border border-gray-200 rounded-xl bg-white overflow-hidden">
+            <div className="px-5 py-3 border-b border-gray-100">
+              <h3 className="text-sm font-semibold text-gray-900">Description</h3>
+            </div>
+            <div className="p-5">
+              <div className="prose prose-sm max-w-none text-gray-600">
+                <p className="whitespace-pre-wrap leading-relaxed m-0">{supportCase.description}</p>
+              </div>
+            </div>
+          </div>
+
+          {/* Help Text */}
+          <div className="rounded-lg bg-blue-50 border border-blue-100 px-4 py-3">
+            <div className="flex gap-3">
+              <div className="flex-shrink-0">
+                <svg className="h-5 w-5 text-blue-500" viewBox="0 0 20 20" fill="currentColor">
+                  <path fillRule="evenodd" d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7-4a1 1 0 11-2 0 1 1 0 012 0zM9 9a.75.75 0 000 1.5h.253a.25.25 0 01.244.304l-.459 2.066A1.75 1.75 0 0010.747 15H11a.75.75 0 000-1.5h-.253a.25.25 0 01-.244-.304l.459-2.066A1.75 1.75 0 009.253 9H9z" clipRule="evenodd" />
+                </svg>
+              </div>
+              <div className="text-sm text-blue-700">
+                <p className="font-medium">Need to update this case?</p>
+                <p className="mt-0.5 text-blue-600">Reply via email and your response will be added to this case automatically.</p>
+              </div>
+            </div>
+          </div>
+        </div>
+      )}
+    </PageLayout>
+  );
+}
diff --git a/apps/portal/src/features/support/views/SupportCasesView.tsx b/apps/portal/src/features/support/views/SupportCasesView.tsx
index 0fde1fca..fa64e206 100644
--- a/apps/portal/src/features/support/views/SupportCasesView.tsx
+++ b/apps/portal/src/features/support/views/SupportCasesView.tsx
@@ -1,32 +1,40 @@
 "use client";
 
 import { useDeferredValue, useMemo, useState } from "react";
-import Link from "next/link";
+import { useRouter } from "next/navigation";
 import {
   ChatBubbleLeftRightIcon,
   MagnifyingGlassIcon,
-  PlusIcon,
   CheckCircleIcon,
   ExclamationTriangleIcon,
   ClockIcon,
   ChevronRightIcon,
-  CalendarIcon,
-  UserIcon,
+  TicketIcon,
+  XMarkIcon,
 } from "@heroicons/react/24/outline";
-import { format } from "date-fns";
+import { ChatBubbleLeftRightIcon as ChatBubbleLeftRightIconSolid } from "@heroicons/react/24/solid";
+import { formatDistanceToNow } from "date-fns";
+import { PageLayout } from "@/components/templates/PageLayout";
+import { AnimatedCard } from "@/components/molecules";
+import { Button } from "@/components/atoms";
+import { EmptyState, SearchEmptyState } from "@/components/atoms/empty-state";
 import { useSupportCases } from "@/features/support/hooks/useSupportCases";
 import {
   SUPPORT_CASE_PRIORITY,
   SUPPORT_CASE_STATUS,
   type SupportCaseFilter,
-  type SupportCasePriority,
-  type SupportCaseStatus,
 } from "@customer-portal/domain/support";
+import {
+  getCaseStatusIcon,
+  getCaseStatusClasses,
+  getCasePriorityClasses,
+} from "@/features/support/utils";
 
 export function SupportCasesView() {
+  const router = useRouter();
   const [searchTerm, setSearchTerm] = useState("");
-  const [statusFilter, setStatusFilter] = useState<SupportCaseStatus | "all">("all");
-  const [priorityFilter, setPriorityFilter] = useState<SupportCasePriority | "all">("all");
+  const [statusFilter, setStatusFilter] = useState<string>("all");
+  const [priorityFilter, setPriorityFilter] = useState<string>("all");
   const deferredSearchTerm = useDeferredValue(searchTerm);
 
   const queryFilters = useMemo(() => {
@@ -43,13 +51,15 @@ export function SupportCasesView() {
     return nextFilters;
   }, [statusFilter, priorityFilter, deferredSearchTerm]);
 
-  const { data, isLoading, error } = useSupportCases(queryFilters);
+  const { data, isLoading, error, refetch } = useSupportCases(queryFilters);
   const cases = data?.cases ?? [];
   const summary = data?.summary ?? { total: 0, open: 0, highPriority: 0, resolved: 0 };
 
+  const hasActiveFilters = statusFilter !== "all" || priorityFilter !== "all" || searchTerm.trim();
+
   const statusFilterOptions = useMemo(
     () => [
-      { value: "all" as const, label: "All Statuses" },
+      { value: "all", label: "All Statuses" },
       ...Object.values(SUPPORT_CASE_STATUS).map(status => ({ value: status, label: status })),
     ],
     []
@@ -57,7 +67,7 @@ export function SupportCasesView() {
 
   const priorityFilterOptions = useMemo(
     () => [
-      { value: "all" as const, label: "All Priorities" },
+      { value: "all", label: "All Priorities" },
       ...Object.values(SUPPORT_CASE_PRIORITY).map(priority => ({
         value: priority,
         label: priority,
@@ -66,302 +76,186 @@ export function SupportCasesView() {
     []
   );
 
-  const getStatusIcon = (status: SupportCaseStatus) => {
-    switch (status) {
-      case SUPPORT_CASE_STATUS.RESOLVED:
-      case SUPPORT_CASE_STATUS.CLOSED:
-        return <CheckCircleIcon className="h-5 w-5 text-green-500" />;
-      case SUPPORT_CASE_STATUS.IN_PROGRESS:
-        return <ClockIcon className="h-5 w-5 text-blue-500" />;
-      case SUPPORT_CASE_STATUS.WAITING_ON_CUSTOMER:
-        return <ExclamationTriangleIcon className="h-5 w-5 text-yellow-500" />;
-      case SUPPORT_CASE_STATUS.OPEN:
-        return <ChatBubbleLeftRightIcon className="h-5 w-5 text-gray-500" />;
-      default:
-        return <ChatBubbleLeftRightIcon className="h-5 w-5 text-gray-500" />;
-    }
+  const clearFilters = () => {
+    setSearchTerm("");
+    setStatusFilter("all");
+    setPriorityFilter("all");
   };
 
-  const getStatusColor = (status: SupportCaseStatus) => {
-    switch (status) {
-      case SUPPORT_CASE_STATUS.RESOLVED:
-      case SUPPORT_CASE_STATUS.CLOSED:
-        return "bg-green-100 text-green-800";
-      case SUPPORT_CASE_STATUS.IN_PROGRESS:
-        return "bg-blue-100 text-blue-800";
-      case SUPPORT_CASE_STATUS.WAITING_ON_CUSTOMER:
-        return "bg-yellow-100 text-yellow-800";
-      case SUPPORT_CASE_STATUS.OPEN:
-        return "bg-gray-100 text-gray-800";
-      default:
-        return "bg-gray-100 text-gray-800";
-    }
-  };
-
-  const getPriorityColor = (priority: SupportCasePriority) => {
-    switch (priority) {
-      case SUPPORT_CASE_PRIORITY.CRITICAL:
-        return "bg-red-100 text-red-800";
-      case SUPPORT_CASE_PRIORITY.HIGH:
-        return "bg-orange-100 text-orange-800";
-      case SUPPORT_CASE_PRIORITY.MEDIUM:
-        return "bg-yellow-100 text-yellow-800";
-      case SUPPORT_CASE_PRIORITY.LOW:
-        return "bg-green-100 text-green-800";
-      default:
-        return "bg-gray-100 text-gray-800";
-    }
-  };
-
-  if (isLoading) {
-    return (
-      <div className="flex items-center justify-center h-64">
-        <div className="text-center">
-          <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-blue-600 mx-auto"></div>
-          <p className="mt-4 text-gray-600">Loading support cases...</p>
-        </div>
-      </div>
-    );
-  }
-
   return (
-    <>
-      <div className="py-6">
-        <div className="max-w-7xl mx-auto px-4 sm:px-6 md:px-8">
-          {/* Header */}
-          <div className="mb-8">
-            <div className="flex items-center justify-between">
-              <div>
-                <h1 className="text-2xl font-bold text-gray-900">Support Cases</h1>
-                <p className="mt-1 text-sm text-gray-600">Track and manage your support requests</p>
-              </div>
-              <Link
-                href="/support/new"
-                className="inline-flex items-center px-4 py-2 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700"
-              >
-                <PlusIcon className="h-4 w-4 mr-2" />
-                New Case
-              </Link>
-            </div>
-          </div>
-
-          {error && (
-            <div className="mb-6 bg-red-50 border border-red-200 rounded-lg p-4 text-sm text-red-800">
-              {error instanceof Error ? error.message : "Failed to load support cases"}
-            </div>
-          )}
-
-          {/* Stats Cards */}
-          <div className="grid grid-cols-1 gap-5 sm:grid-cols-2 lg:grid-cols-4 mb-8">
-            <div className="bg-white overflow-hidden shadow rounded-lg">
-              <div className="p-5">
-                <div className="flex items-center">
-                  <div className="flex-shrink-0">
-                    <ChatBubbleLeftRightIcon className="h-6 w-6 text-gray-600" />
-                  </div>
-                  <div className="ml-5 w-0 flex-1">
-                    <dl>
-                      <dt className="text-sm font-medium text-gray-500 truncate">Total Cases</dt>
-                      <dd className="text-lg font-medium text-gray-900">{summary.total}</dd>
-                    </dl>
-                  </div>
-                </div>
-              </div>
-            </div>
-
-            <div className="bg-white overflow-hidden shadow rounded-lg">
-              <div className="p-5">
-                <div className="flex items-center">
-                  <div className="flex-shrink-0">
-                    <ClockIcon className="h-6 w-6 text-blue-600" />
-                  </div>
-                  <div className="ml-5 w-0 flex-1">
-                    <dl>
-                      <dt className="text-sm font-medium text-gray-500 truncate">Open Cases</dt>
-                      <dd className="text-lg font-medium text-gray-900">{summary.open}</dd>
-                    </dl>
-                  </div>
-                </div>
-              </div>
-            </div>
-
-            <div className="bg-white overflow-hidden shadow rounded-lg">
-              <div className="p-5">
-                <div className="flex items-center">
-                  <div className="flex-shrink-0">
-                    <ExclamationTriangleIcon className="h-6 w-6 text-red-600" />
-                  </div>
-                  <div className="ml-5 w-0 flex-1">
-                    <dl>
-                      <dt className="text-sm font-medium text-gray-500 truncate">High Priority</dt>
-                      <dd className="text-lg font-medium text-gray-900">{summary.highPriority}</dd>
-                    </dl>
-                  </div>
-                </div>
-              </div>
-            </div>
-
-            <div className="bg-white overflow-hidden shadow rounded-lg">
-              <div className="p-5">
-                <div className="flex items-center">
-                  <div className="flex-shrink-0">
-                    <CheckCircleIcon className="h-6 w-6 text-green-600" />
-                  </div>
-                  <div className="ml-5 w-0 flex-1">
-                    <dl>
-                      <dt className="text-sm font-medium text-gray-500 truncate">Resolved</dt>
-                      <dd className="text-lg font-medium text-gray-900">{summary.resolved}</dd>
-                    </dl>
-                  </div>
-                </div>
-              </div>
-            </div>
-          </div>
-
-          {/* Filters */}
-          <div className="bg-white shadow rounded-lg mb-6">
-            <div className="p-6">
-              <div className="flex flex-col sm:flex-row gap-4">
-                {/* Search */}
-                <div className="flex-1 relative">
-                  <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none">
-                    <MagnifyingGlassIcon className="h-5 w-5 text-gray-400" />
-                  </div>
-                  <input
-                    type="text"
-                    placeholder="Search cases..."
-                    value={searchTerm}
-                    onChange={event => setSearchTerm(event.target.value)}
-                    className="block w-full pl-10 pr-3 py-2 border border-gray-300 rounded-md leading-5 bg-white placeholder-gray-500 focus:outline-none focus:placeholder-gray-400 focus:ring-1 focus:ring-blue-500 focus:border-blue-500"
-                  />
-                </div>
-
-                {/* Status Filter */}
-                <div className="relative">
-                  <select
-                    value={statusFilter}
-                    onChange={event =>
-                      setStatusFilter(event.target.value as SupportCaseStatus | "all")
-                    }
-                    className="block w-full px-3 py-2 border border-gray-300 rounded-md leading-5 bg-white focus:outline-none focus:ring-1 focus:ring-blue-500 focus:border-blue-500"
-                  >
-                    {statusFilterOptions.map(option => (
-                      <option key={option.value} value={option.value}>
-                        {option.label}
-                      </option>
-                    ))}
-                  </select>
-                </div>
-
-                {/* Priority Filter */}
-                <div className="relative">
-                  <select
-                    value={priorityFilter}
-                    onChange={event =>
-                      setPriorityFilter(event.target.value as SupportCasePriority | "all")
-                    }
-                    className="block w-full px-3 py-2 border border-gray-300 rounded-md leading-5 bg-white focus:outline-none focus:ring-1 focus:ring-blue-500 focus:border-blue-500"
-                  >
-                    {priorityFilterOptions.map(option => (
-                      <option key={option.value} value={option.value}>
-                        {option.label}
-                      </option>
-                    ))}
-                  </select>
-                </div>
-              </div>
-            </div>
-          </div>
-
-          {/* Cases List */}
-          <div className="bg-white shadow overflow-hidden sm:rounded-md">
-            <ul className="divide-y divide-gray-200">
-              {cases.map(supportCase => (
-                <li key={supportCase.id}>
-                  <Link
-                    href={`/support/cases/${supportCase.id}`}
-                    className="block hover:bg-gray-50"
-                  >
-                    <div className="px-4 py-4 sm:px-6">
-                      <div className="flex items-center justify-between">
-                        <div className="flex items-center space-x-4 flex-1">
-                          <div className="flex-shrink-0">{getStatusIcon(supportCase.status)}</div>
-                          <div className="min-w-0 flex-1">
-                            <div className="flex items-center space-x-3 mb-2">
-                              <p className="text-sm font-medium text-blue-600 truncate">
-                                #{supportCase.id} - {supportCase.subject}
-                              </p>
-                              <span
-                                className={`inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium ${getStatusColor(supportCase.status)}`}
-                              >
-                                {supportCase.status}
-                              </span>
-                              <span
-                                className={`inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium ${getPriorityColor(supportCase.priority)}`}
-                              >
-                                {supportCase.priority}
-                              </span>
-                            </div>
-                            <p className="text-sm text-gray-500 mb-2 line-clamp-2">
-                              {supportCase.description}
-                            </p>
-                            <div className="flex items-center space-x-6 text-xs text-gray-500">
-                              <div className="flex items-center">
-                                <CalendarIcon className="h-4 w-4 mr-1" />
-                                Created: {format(new Date(supportCase.createdAt), "MMM d, yyyy")}
-                              </div>
-                              <div className="flex items-center">
-                                <CalendarIcon className="h-4 w-4 mr-1" />
-                                Updated: {format(new Date(supportCase.updatedAt), "MMM d, yyyy")}
-                              </div>
-                              {supportCase.assignedTo && (
-                                <div className="flex items-center">
-                                  <UserIcon className="h-4 w-4 mr-1" />
-                                  {supportCase.assignedTo}
-                                </div>
-                              )}
-                              <span className="capitalize bg-gray-100 text-gray-700 px-2 py-1 rounded text-xs">
-                                {supportCase.category}
-                              </span>
-                            </div>
-                          </div>
-                        </div>
-                        <div className="flex items-center space-x-2">
-                          <ChevronRightIcon className="h-5 w-5 text-gray-400" />
-                        </div>
-                      </div>
-                    </div>
-                  </Link>
-                </li>
-              ))}
-            </ul>
-
-            {/* Empty State */}
-            {cases.length === 0 && (
-              <div className="text-center py-12">
-                <ChatBubbleLeftRightIcon className="mx-auto h-12 w-12 text-gray-400" />
-                <h3 className="mt-2 text-sm font-medium text-gray-900">No support cases found</h3>
-                <p className="mt-1 text-sm text-gray-500">
-                  {searchTerm || statusFilter !== "all" || priorityFilter !== "all"
-                    ? "Try adjusting your search or filter criteria"
-                    : "Your support cases will appear here when you create them"}
-                </p>
-                {searchTerm === "" && statusFilter === "all" && priorityFilter === "all" && (
-                  <div className="mt-6">
-                    <Link
-                      href="/support/new"
-                      className="inline-flex items-center px-4 py-2 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700"
-                    >
-                      <PlusIcon className="h-4 w-4 mr-2" />
-                      Create Your First Case
-                    </Link>
-                  </div>
-                )}
-              </div>
-            )}
+    <PageLayout
+      icon={<ChatBubbleLeftRightIconSolid />}
+      title="Support Cases"
+      description="Track and manage your support requests"
+      loading={isLoading}
+      error={error}
+      onRetry={() => void refetch()}
+      breadcrumbs={[
+        { label: "Support", href: "/support" },
+        { label: "Cases" },
+      ]}
+      actions={
+        <Button
+          as="a"
+          href="/support/new"
+          leftIcon={<TicketIcon className="h-4 w-4" />}
+        >
+          New Case
+        </Button>
+      }
+    >
+      {/* Summary Strip */}
+      <div className="flex flex-wrap items-center gap-6 px-1 text-sm">
+        <div className="flex items-center gap-2">
+          <ChatBubbleLeftRightIcon className="h-4 w-4 text-gray-400" />
+          <span className="text-gray-600">Total</span>
+          <span className="font-semibold text-gray-900">{summary.total}</span>
+        </div>
+        <div className="flex items-center gap-2">
+          <ClockIcon className="h-4 w-4 text-blue-500" />
+          <span className="text-gray-600">Open</span>
+          <span className="font-semibold text-blue-600">{summary.open}</span>
+        </div>
+        {summary.highPriority > 0 && (
+          <div className="flex items-center gap-2">
+            <ExclamationTriangleIcon className="h-4 w-4 text-amber-500" />
+            <span className="text-gray-600">High Priority</span>
+            <span className="font-semibold text-amber-600">{summary.highPriority}</span>
           </div>
+        )}
+        <div className="flex items-center gap-2">
+          <CheckCircleIcon className="h-4 w-4 text-green-500" />
+          <span className="text-gray-600">Resolved</span>
+          <span className="font-semibold text-green-600">{summary.resolved}</span>
         </div>
       </div>
-    </>
+
+      {/* Search & Filters */}
+      <div className="flex flex-col sm:flex-row gap-3">
+        {/* Search */}
+        <div className="flex-1 relative">
+          <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none">
+            <MagnifyingGlassIcon className="h-4 w-4 text-gray-400" />
+          </div>
+          <input
+            type="text"
+            placeholder="Search by case number or subject..."
+            value={searchTerm}
+            onChange={event => setSearchTerm(event.target.value)}
+            className="block w-full pl-9 pr-3 py-2 border border-gray-200 rounded-lg text-sm bg-white placeholder-gray-400 focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 transition-all"
+          />
+        </div>
+
+        {/* Filters */}
+        <div className="flex gap-2">
+          <select
+            value={statusFilter}
+            onChange={event => setStatusFilter(event.target.value)}
+            className="appearance-none pl-3 pr-8 py-2 border border-gray-200 rounded-lg text-sm bg-white focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 transition-all cursor-pointer"
+          >
+            {statusFilterOptions.map(option => (
+              <option key={option.value} value={option.value}>
+                {option.label}
+              </option>
+            ))}
+          </select>
+
+          <select
+            value={priorityFilter}
+            onChange={event => setPriorityFilter(event.target.value)}
+            className="appearance-none pl-3 pr-8 py-2 border border-gray-200 rounded-lg text-sm bg-white focus:outline-none focus:ring-2 focus:ring-blue-500/20 focus:border-blue-500 transition-all cursor-pointer"
+          >
+            {priorityFilterOptions.map(option => (
+              <option key={option.value} value={option.value}>
+                {option.label}
+              </option>
+            ))}
+          </select>
+
+          {hasActiveFilters && (
+            <button
+              onClick={clearFilters}
+              className="flex items-center gap-1 px-3 py-2 text-sm text-gray-500 hover:text-gray-700 hover:bg-gray-100 rounded-lg transition-colors"
+            >
+              <XMarkIcon className="h-4 w-4" />
+              <span className="hidden sm:inline">Clear</span>
+            </button>
+          )}
+        </div>
+      </div>
+
+      {/* Cases List */}
+      {cases.length > 0 ? (
+        <div className="border border-gray-200 rounded-xl bg-white divide-y divide-gray-100 overflow-hidden">
+          {cases.map(supportCase => (
+            <div
+              key={supportCase.id}
+              onClick={() => router.push(`/support/cases/${supportCase.id}`)}
+              className="flex items-center gap-4 p-4 hover:bg-gray-50 cursor-pointer transition-colors group"
+            >
+              {/* Status Icon */}
+              <div className="flex-shrink-0">
+                {getCaseStatusIcon(supportCase.status)}
+              </div>
+
+              {/* Main Content */}
+              <div className="flex-1 min-w-0">
+                <div className="flex items-center gap-2 mb-1">
+                  <span className="text-sm font-medium text-blue-600">
+                    #{supportCase.caseNumber}
+                  </span>
+                  <span className="text-sm text-gray-900 truncate">
+                    {supportCase.subject}
+                  </span>
+                </div>
+                <div className="flex flex-wrap items-center gap-2">
+                  <span
+                    className={`inline-flex text-xs px-2 py-0.5 rounded font-medium ${getCaseStatusClasses(supportCase.status)}`}
+                  >
+                    {supportCase.status}
+                  </span>
+                  <span
+                    className={`inline-flex text-xs px-2 py-0.5 rounded font-medium ${getCasePriorityClasses(supportCase.priority)}`}
+                  >
+                    {supportCase.priority}
+                  </span>
+                  {supportCase.category && (
+                    <span className="text-xs text-gray-500">
+                      {supportCase.category}
+                    </span>
+                  )}
+                </div>
+              </div>
+
+              {/* Timestamp */}
+              <div className="hidden sm:block text-right flex-shrink-0">
+                <p className="text-xs text-gray-400">
+                  Updated {formatDistanceToNow(new Date(supportCase.updatedAt), { addSuffix: true })}
+                </p>
+              </div>
+
+              {/* Arrow */}
+              <ChevronRightIcon className="h-4 w-4 text-gray-300 group-hover:text-gray-400 flex-shrink-0 transition-colors" />
+            </div>
+          ))}
+        </div>
+      ) : hasActiveFilters ? (
+        <AnimatedCard className="p-8" variant="static">
+          <SearchEmptyState searchTerm={searchTerm || "filters"} onClearSearch={clearFilters} />
+        </AnimatedCard>
+      ) : (
+        <AnimatedCard className="p-8" variant="static">
+          <EmptyState
+            icon={<TicketIcon className="h-12 w-12" />}
+            title="No support cases found"
+            description="You haven't created any support cases yet. Need help? Create a new case."
+            action={{
+              label: "Create Case",
+              onClick: () => router.push("/support/new"),
+            }}
+          />
+        </AnimatedCard>
+      )}
+    </PageLayout>
   );
 }
diff --git a/apps/portal/src/features/support/views/SupportHomeView.tsx b/apps/portal/src/features/support/views/SupportHomeView.tsx
new file mode 100644
index 00000000..0896691c
--- /dev/null
+++ b/apps/portal/src/features/support/views/SupportHomeView.tsx
@@ -0,0 +1,161 @@
+"use client";
+
+import Link from "next/link";
+import { useRouter } from "next/navigation";
+import {
+  ChatBubbleLeftRightIcon,
+  SparklesIcon,
+  PlusIcon,
+  ChevronRightIcon,
+  TicketIcon,
+  ClockIcon,
+  CheckCircleIcon,
+} from "@heroicons/react/24/outline";
+import { ChatBubbleLeftRightIcon as ChatBubbleLeftRightIconSolid } from "@heroicons/react/24/solid";
+import { formatDistanceToNow } from "date-fns";
+import { PageLayout } from "@/components/templates/PageLayout";
+import { AnimatedCard } from "@/components/molecules";
+import { Button } from "@/components/atoms";
+import { EmptyState } from "@/components/atoms/empty-state";
+import { useSupportCases } from "@/features/support/hooks/useSupportCases";
+import { getCaseStatusIcon, getCaseStatusClasses } from "@/features/support/utils";
+
+export function SupportHomeView() {
+  const router = useRouter();
+  const { data, isLoading, error, refetch } = useSupportCases();
+  const recentCases = data?.cases?.slice(0, 5) ?? [];
+  const summary = data?.summary ?? { total: 0, open: 0, highPriority: 0, resolved: 0 };
+
+  return (
+    <PageLayout
+      icon={<ChatBubbleLeftRightIconSolid />}
+      title="Support Center"
+      description="Get help with your account and services"
+      loading={isLoading}
+      error={error}
+      onRetry={() => void refetch()}
+    >
+      {/* Quick Actions */}
+      <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
+        {/* AI Assistant Card */}
+        <div className="bg-gradient-to-br from-blue-600 to-blue-700 rounded-xl p-5 text-white">
+          <div className="flex items-start gap-4">
+            <div className="w-10 h-10 bg-white/20 rounded-lg flex items-center justify-center flex-shrink-0">
+              <SparklesIcon className="h-5 w-5" />
+            </div>
+            <div className="flex-1 min-w-0">
+              <h3 className="font-semibold mb-1">AI Assistant</h3>
+              <p className="text-sm text-blue-100 mb-4 leading-relaxed">
+                Get instant answers to common questions about your account.
+              </p>
+              <Button
+                size="sm"
+                className="bg-white text-blue-600 hover:bg-blue-50 shadow-sm"
+              >
+                Start Chat
+              </Button>
+            </div>
+          </div>
+        </div>
+
+        {/* Create Case Card */}
+        <div className="border border-gray-200 rounded-xl p-5 bg-white">
+          <div className="flex items-start gap-4">
+            <div className="w-10 h-10 bg-gray-100 rounded-lg flex items-center justify-center flex-shrink-0">
+              <PlusIcon className="h-5 w-5 text-gray-600" />
+            </div>
+            <div className="flex-1 min-w-0">
+              <h3 className="font-semibold text-gray-900 mb-1">Create Support Case</h3>
+              <p className="text-sm text-gray-500 mb-4 leading-relaxed">
+                Our team typically responds within 24 hours.
+              </p>
+              <Button
+                as="a"
+                href="/support/new"
+                size="sm"
+                variant="outline"
+              >
+                New Case
+              </Button>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      {/* Cases Section */}
+      <div>
+        <div className="flex items-center justify-between mb-4">
+          <div className="flex items-center gap-4">
+            <h3 className="text-lg font-semibold text-gray-900">Your Cases</h3>
+            {summary.total > 0 && (
+              <div className="flex items-center gap-3 text-sm">
+                <span className="flex items-center gap-1.5 text-gray-500">
+                  <ClockIcon className="h-4 w-4 text-blue-500" />
+                  <span className="font-medium text-blue-600">{summary.open}</span> open
+                </span>
+                <span className="flex items-center gap-1.5 text-gray-500">
+                  <CheckCircleIcon className="h-4 w-4 text-green-500" />
+                  <span className="font-medium text-green-600">{summary.resolved}</span> resolved
+                </span>
+              </div>
+            )}
+          </div>
+          {summary.total > 0 && (
+            <Link
+              href="/support/cases"
+              className="text-sm text-blue-600 hover:text-blue-700 font-medium inline-flex items-center gap-1"
+            >
+              View all
+              <ChevronRightIcon className="h-4 w-4" />
+            </Link>
+          )}
+        </div>
+
+        {recentCases.length > 0 ? (
+          <div className="border border-gray-200 rounded-xl bg-white divide-y divide-gray-100 overflow-hidden">
+            {recentCases.map(supportCase => (
+              <div
+                key={supportCase.id}
+                onClick={() => router.push(`/support/cases/${supportCase.id}`)}
+                className="flex items-center gap-4 p-4 hover:bg-gray-50 cursor-pointer transition-colors group"
+              >
+                <div className="flex-shrink-0">
+                  {getCaseStatusIcon(supportCase.status)}
+                </div>
+                <div className="flex-1 min-w-0">
+                  <div className="flex items-center gap-2 mb-0.5">
+                    <span className="text-sm font-medium text-gray-900">
+                      #{supportCase.caseNumber}
+                    </span>
+                    <span
+                      className={`text-xs px-1.5 py-0.5 rounded font-medium ${getCaseStatusClasses(supportCase.status)}`}
+                    >
+                      {supportCase.status}
+                    </span>
+                  </div>
+                  <p className="text-sm text-gray-600 truncate">{supportCase.subject}</p>
+                </div>
+                <div className="hidden sm:block text-xs text-gray-400 flex-shrink-0">
+                  {formatDistanceToNow(new Date(supportCase.updatedAt), { addSuffix: true })}
+                </div>
+                <ChevronRightIcon className="h-4 w-4 text-gray-300 group-hover:text-gray-400 flex-shrink-0 transition-colors" />
+              </div>
+            ))}
+          </div>
+        ) : (
+          <AnimatedCard className="p-8" variant="static">
+            <EmptyState
+              icon={<TicketIcon className="h-12 w-12" />}
+              title="No support cases yet"
+              description="Need help? Start a chat with our AI assistant or create a support case."
+              action={{
+                label: "Create Case",
+                onClick: () => router.push("/support/new"),
+              }}
+            />
+          </AnimatedCard>
+        )}
+      </div>
+    </PageLayout>
+  );
+}
diff --git a/apps/portal/src/features/support/views/index.ts b/apps/portal/src/features/support/views/index.ts
index 48725ad4..4c038ea8 100644
--- a/apps/portal/src/features/support/views/index.ts
+++ b/apps/portal/src/features/support/views/index.ts
@@ -1,2 +1,4 @@
 export * from "./NewSupportCaseView";
 export * from "./SupportCasesView";
+export * from "./SupportCaseDetailView";
+export * from "./SupportHomeView";
diff --git a/apps/portal/src/lib/api/index.ts b/apps/portal/src/lib/api/index.ts
index 3dd6b189..6c3bb677 100644
--- a/apps/portal/src/lib/api/index.ts
+++ b/apps/portal/src/lib/api/index.ts
@@ -15,6 +15,58 @@ export * from "./response-helpers";
 import { createClient, ApiError } from "./runtime/client";
 import { logger } from "@/lib/logger";
 
+/**
+ * Auth endpoints that should NOT trigger automatic logout on 401
+ * These are endpoints where 401 means "invalid credentials", not "session expired"
+ */
+const AUTH_ENDPOINTS = [
+  "/api/auth/login",
+  "/api/auth/signup",
+  "/api/auth/link-whmcs",
+  "/api/auth/set-password",
+  "/api/auth/reset-password",
+  "/api/auth/check-password-needed",
+];
+
+/**
+ * Check if a URL path is an auth endpoint
+ */
+function isAuthEndpoint(url: string): boolean {
+  try {
+    const urlPath = new URL(url).pathname;
+    return AUTH_ENDPOINTS.some(endpoint => urlPath.endsWith(endpoint));
+  } catch {
+    return AUTH_ENDPOINTS.some(endpoint => url.includes(endpoint));
+  }
+}
+
+/**
+ * Extract error message from API error body
+ * Handles both `{ message }` and `{ error: { message } }` formats
+ */
+function extractErrorMessage(body: unknown): string | null {
+  if (!body || typeof body !== "object") {
+    return null;
+  }
+
+  // Check for nested error.message format (standard API error response)
+  const bodyWithError = body as { error?: { message?: unknown } };
+  if (bodyWithError.error && typeof bodyWithError.error === "object") {
+    const errorMessage = bodyWithError.error.message;
+    if (typeof errorMessage === "string") {
+      return errorMessage;
+    }
+  }
+
+  // Check for top-level message
+  const bodyWithMessage = body as { message?: unknown };
+  if (typeof bodyWithMessage.message === "string") {
+    return bodyWithMessage.message;
+  }
+
+  return null;
+}
+
 /**
  * Global error handler for API client
  * Handles authentication errors and triggers logout when needed
@@ -23,7 +75,10 @@ async function handleApiError(response: Response): Promise<void> {
   // Don't import useAuthStore at module level to avoid circular dependencies
   // We'll handle auth errors by dispatching a custom event that the auth system can listen to
 
-  if (response.status === 401) {
+  // Only dispatch logout event for 401s on non-auth endpoints
+  // Auth endpoints (login, signup, etc.) return 401 for invalid credentials,
+  // which should NOT trigger logout - just show the error message
+  if (response.status === 401 && !isAuthEndpoint(response.url)) {
     logger.warn("Received 401 Unauthorized response - triggering logout");
 
     // Dispatch a custom event that the auth system will listen to
@@ -45,11 +100,9 @@ async function handleApiError(response: Response): Promise<void> {
     const contentType = cloned.headers.get("content-type");
     if (contentType?.includes("application/json")) {
       body = await cloned.json();
-      if (body && typeof body === "object" && "message" in body) {
-        const maybeMessage = (body as { message?: unknown }).message;
-        if (typeof maybeMessage === "string") {
-          message = maybeMessage;
-        }
+      const extractedMessage = extractErrorMessage(body);
+      if (extractedMessage) {
+        message = extractedMessage;
       }
     }
   } catch {
@@ -104,6 +157,7 @@ export const queryKeys = {
   },
   support: {
     cases: (params?: Record<string, unknown>) => ["support", "cases", params] as const,
+    case: (id: string) => ["support", "case", id] as const,
   },
   currency: {
     default: () => ["currency", "default"] as const,
diff --git a/apps/portal/src/lib/utils/error-display.ts b/apps/portal/src/lib/utils/error-display.ts
deleted file mode 100644
index 0249df85..00000000
--- a/apps/portal/src/lib/utils/error-display.ts
+++ /dev/null
@@ -1,41 +0,0 @@
-/**
- * Error display utilities
- * Converts errors to user-friendly messages
- */
-
-import { isApiError } from "@/lib/api/runtime/client";
-
-export function toUserMessage(error: unknown): string {
-  if (typeof error === "string") {
-    return error;
-  }
-
-  // Handle API errors with specific status codes
-  if (isApiError(error)) {
-    const status = error.response?.status;
-    const body = error.body as Record<string, unknown> | undefined;
-
-    // Rate limit error (429)
-    if (status === 429) {
-      return "Too many requests. Please wait a moment and try again.";
-    }
-
-    // Get message from error body
-    if (body && typeof body.error === "object") {
-      const errorObj = body.error as Record<string, unknown>;
-      if (typeof errorObj.message === "string") {
-        return errorObj.message;
-      }
-    }
-
-    if (body && typeof body.message === "string") {
-      return body.message;
-    }
-  }
-
-  if (error && typeof error === "object" && "message" in error) {
-    return String(error.message);
-  }
-
-  return "An unexpected error occurred";
-}
diff --git a/apps/portal/src/lib/utils/error-handling.ts b/apps/portal/src/lib/utils/error-handling.ts
index 62c15927..cb580e16 100644
--- a/apps/portal/src/lib/utils/error-handling.ts
+++ b/apps/portal/src/lib/utils/error-handling.ts
@@ -1,256 +1,254 @@
 /**
- * Standardized Error Handling for Portal
- * Provides consistent error handling and user-friendly messages
+ * Unified Error Handling for Portal
+ *
+ * Clean, simple error handling that uses shared error codes from domain package.
+ * Provides consistent error parsing and user-friendly messages.
  */
 
-import { ApiError as ClientApiError } from "@/lib/api";
-import { apiErrorResponseSchema, type ApiErrorResponse } from "@customer-portal/domain/common";
+import { ApiError as ClientApiError, isApiError } from "@/lib/api";
+import {
+  ErrorCode,
+  ErrorMessages,
+  ErrorMetadata,
+  matchErrorPattern,
+  type ErrorCodeType,
+} from "@customer-portal/domain/common";
 
-export type ApiErrorPayload = ApiErrorResponse;
+// ============================================================================
+// Types
+// ============================================================================
 
-export interface ApiErrorInfo {
-  code: string;
+export interface ParsedError {
+  code: ErrorCodeType;
   message: string;
-  shouldLogout?: boolean;
-  shouldRetry?: boolean;
+  shouldLogout: boolean;
+  shouldRetry: boolean;
 }
 
+// ============================================================================
+// Error Parsing
+// ============================================================================
+
 /**
- * Extract error information from various error types
+ * Parse any error into a structured format with code and user-friendly message.
+ * This is the main entry point for error handling.
  */
-export function getErrorInfo(error: unknown): ApiErrorInfo {
-  if (error instanceof ClientApiError) {
-    const info = parseClientApiError(error);
-    if (info) {
-      return info;
-    }
+export function parseError(error: unknown): ParsedError {
+  // Handle API client errors
+  if (isApiError(error)) {
+    return parseApiError(error);
   }
 
-  // Handle fetch/network errors
+  // Handle network/fetch errors
   if (error instanceof Error) {
-    if (error.name === "TypeError" && error.message.includes("fetch")) {
-      return {
-        code: "NETWORK_ERROR",
-        message:
-          "Unable to connect to the server. Please check your internet connection and try again.",
-        shouldRetry: true,
-      };
-    }
-
-    if (error.name === "AbortError") {
-      return {
-        code: "REQUEST_TIMEOUT",
-        message: "The request timed out. Please try again.",
-        shouldRetry: true,
-      };
-    }
+    return parseNativeError(error);
+  }
 
+  // Handle string errors
+  if (typeof error === "string") {
+    const code = matchErrorPattern(error);
+    const metadata = ErrorMetadata[code];
     return {
-      code: "UNKNOWN_ERROR",
-      message: "An unexpected error occurred. Please try again.",
-      shouldRetry: true,
+      code,
+      message: error,
+      shouldLogout: metadata.shouldLogout,
+      shouldRetry: metadata.shouldRetry,
     };
   }
 
-  // Fallback for unknown error types
+  // Unknown error type
   return {
-    code: "UNKNOWN_ERROR",
-    message: "An unexpected error occurred. Please try again.",
+    code: ErrorCode.UNKNOWN,
+    message: ErrorMessages[ErrorCode.UNKNOWN],
+    shouldLogout: false,
     shouldRetry: true,
   };
 }
 
-export function isApiErrorPayload(error: unknown): error is ApiErrorPayload {
-  const parsed = apiErrorResponseSchema.safeParse(error);
-  return parsed.success;
-}
-
 /**
- * Determine if the user should be logged out for this error
+ * Parse API client error
  */
-function shouldLogoutForError(code: string): boolean {
-  const logoutCodes = ["TOKEN_REVOKED", "INVALID_REFRESH_TOKEN"];
-  return logoutCodes.includes(code);
-}
-
-/**
- * Determine if the request should be retried for this error
- */
-function shouldRetryForError(code: string): boolean {
-  const noRetryCodes = [
-    "INVALID_CREDENTIALS",
-    "FORBIDDEN",
-    "ADMIN_REQUIRED",
-    "ACCOUNT_LOCKED",
-    "VALIDATION_ERROR",
-    "ACCOUNT_ALREADY_LINKED",
-    "ACCOUNT_EXISTS",
-    "CUSTOMER_NOT_FOUND",
-    "INVALID_REQUEST",
-  ];
-  return !noRetryCodes.includes(code);
-}
-
-/**
- * Get a user-friendly error message for display in UI
- */
-export function getUserFriendlyMessage(error: unknown): string {
-  const errorInfo = getErrorInfo(error);
-  return errorInfo.message;
-}
-
-/**
- * Handle authentication errors consistently
- */
-export function handleAuthError(error: unknown, logout: () => void | Promise<void>): boolean {
-  const errorInfo = getErrorInfo(error);
-
-  if (errorInfo.shouldLogout) {
-    void logout();
-    return true;
-  }
-
-  return false;
-}
-
-/**
- * Create a standardized error for logging
- */
-export function createErrorLog(
-  error: unknown,
-  context: string
-): {
-  context: string;
-  code: string;
-  message: string;
-  timestamp: string;
-} {
-  const errorInfo = getErrorInfo(error);
-
-  return {
-    context,
-    code: errorInfo.code,
-    message: errorInfo.message,
-    timestamp: new Date().toISOString(),
-  };
-}
-
-function parseClientApiError(error: ClientApiError): ApiErrorInfo | null {
+function parseApiError(error: ClientApiError): ParsedError {
+  const body = error.body;
   const status = error.response?.status;
-  const parsedBody = parseRawErrorBody(error.body);
 
-  const payloadInfo = parsedBody ? deriveInfoFromPayload(parsedBody, status) : null;
+  // Try to extract from standard API error response format
+  if (body && typeof body === "object") {
+    const bodyObj = body as Record<string, unknown>;
 
-  if (payloadInfo) {
-    return payloadInfo;
-  }
+    // Check for standard { success: false, error: { code, message } } format
+    if (
+      bodyObj.success === false &&
+      bodyObj.error &&
+      typeof bodyObj.error === "object"
+    ) {
+      const errorObj = bodyObj.error as Record<string, unknown>;
+      const code = typeof errorObj.code === "string" ? errorObj.code : undefined;
+      const message = typeof errorObj.message === "string" ? errorObj.message : undefined;
 
-  return {
-    code: status ? httpStatusCodeToLabel(status) : "API_ERROR",
-    message: error.message,
-    shouldLogout: status ? shouldLogoutForError(httpStatusCodeToLabel(status)) : false,
-    shouldRetry: typeof status === "number" ? status >= 500 : true,
-  };
-}
+      if (code && message) {
+        const metadata = ErrorMetadata[code as ErrorCodeType] ?? ErrorMetadata[ErrorCode.UNKNOWN];
+        return {
+          code: code as ErrorCodeType,
+          message,
+          shouldLogout: metadata.shouldLogout,
+          shouldRetry: metadata.shouldRetry,
+        };
+      }
+    }
 
-function parseRawErrorBody(body: unknown): unknown {
-  if (!body) {
-    return null;
-  }
-
-  if (typeof body === "string") {
-    try {
-      return JSON.parse(body);
-    } catch {
-      return body;
+    // Try extracting message from body
+    const extractedMessage = extractMessageFromBody(body);
+    if (extractedMessage) {
+      const code = matchErrorPattern(extractedMessage);
+      const metadata = ErrorMetadata[code];
+      return {
+        code,
+        message: extractedMessage,
+        shouldLogout: metadata.shouldLogout,
+        shouldRetry: metadata.shouldRetry,
+      };
     }
   }
 
-  return body;
+  // Fall back to status code mapping
+  const code = mapStatusToErrorCode(status);
+  const metadata = ErrorMetadata[code];
+  return {
+    code,
+    message: error.message || ErrorMessages[code],
+    shouldLogout: metadata.shouldLogout,
+    shouldRetry: metadata.shouldRetry,
+  };
 }
 
-function deriveInfoFromPayload(payload: unknown, status?: number): ApiErrorInfo | null {
-  const parsed = apiErrorResponseSchema.safeParse(payload);
-  if (parsed.success) {
-    const code = parsed.data.error.code;
+/**
+ * Parse native JavaScript errors (network, timeout, etc.)
+ */
+function parseNativeError(error: Error): ParsedError {
+  // Network errors
+  if (error.name === "TypeError" && error.message.includes("fetch")) {
     return {
-      code,
-      message: parsed.data.error.message,
-      shouldLogout: shouldLogoutForError(code),
-      shouldRetry: shouldRetryForError(code),
+      code: ErrorCode.NETWORK_ERROR,
+      message: ErrorMessages[ErrorCode.NETWORK_ERROR],
+      shouldLogout: false,
+      shouldRetry: true,
     };
   }
 
-  if (isGlobalErrorPayload(payload)) {
-    const code = payload.code || payload.error || httpStatusCodeToLabel(status);
-    const message = payload.message || "Request failed. Please try again.";
-    const derivedStatus = payload.statusCode ?? status;
-
+  // Timeout errors
+  if (error.name === "AbortError") {
     return {
-      code,
-      message,
-      shouldLogout: shouldLogoutForError(code),
-      shouldRetry:
-        typeof derivedStatus === "number" ? derivedStatus >= 500 : shouldRetryForError(code),
+      code: ErrorCode.TIMEOUT,
+      message: ErrorMessages[ErrorCode.TIMEOUT],
+      shouldLogout: false,
+      shouldRetry: true,
     };
   }
 
-  if (
-    typeof payload === "object" &&
-    payload !== null &&
-    "message" in payload &&
-    typeof (payload as { message?: unknown }).message === "string"
-  ) {
-    const payloadWithMessage = payload as { code?: unknown; message: string };
-    const candidateCode = payloadWithMessage.code;
-    const code = typeof candidateCode === "string" ? candidateCode : httpStatusCodeToLabel(status);
+  // Try pattern matching on error message
+  const code = matchErrorPattern(error.message);
+  const metadata = ErrorMetadata[code];
+  return {
+    code,
+    message: code === ErrorCode.UNKNOWN ? error.message : ErrorMessages[code],
+    shouldLogout: metadata.shouldLogout,
+    shouldRetry: metadata.shouldRetry,
+  };
+}
 
-    return {
-      code,
-      message: payloadWithMessage.message,
-      shouldLogout: shouldLogoutForError(code),
-      shouldRetry: typeof status === "number" ? status >= 500 : shouldRetryForError(code),
-    };
+/**
+ * Extract error message from response body
+ */
+function extractMessageFromBody(body: unknown): string | null {
+  if (!body || typeof body !== "object") {
+    return null;
+  }
+
+  const bodyObj = body as Record<string, unknown>;
+
+  // Check nested error.message (standard format)
+  if (bodyObj.error && typeof bodyObj.error === "object") {
+    const errorObj = bodyObj.error as Record<string, unknown>;
+    if (typeof errorObj.message === "string") {
+      return errorObj.message;
+    }
+  }
+
+  // Check top-level message
+  if (typeof bodyObj.message === "string") {
+    return bodyObj.message;
   }
 
   return null;
 }
 
-function isGlobalErrorPayload(payload: unknown): payload is {
-  success: false;
-  code?: string;
-  message?: string;
-  error?: string;
-  statusCode?: number;
-} {
-  return (
-    typeof payload === "object" &&
-    payload !== null &&
-    "success" in payload &&
-    (payload as { success?: unknown }).success === false &&
-    ("code" in payload || "message" in payload || "error" in payload)
-  );
-}
-
-function httpStatusCodeToLabel(status?: number): string {
-  if (!status) {
-    return "API_ERROR";
-  }
+/**
+ * Map HTTP status code to error code
+ */
+function mapStatusToErrorCode(status?: number): ErrorCodeType {
+  if (!status) return ErrorCode.UNKNOWN;
 
   switch (status) {
     case 400:
-      return "BAD_REQUEST";
+      return ErrorCode.VALIDATION_FAILED;
     case 401:
-      return "UNAUTHORIZED";
+      return ErrorCode.SESSION_EXPIRED;
     case 403:
-      return "FORBIDDEN";
+      return ErrorCode.FORBIDDEN;
     case 404:
-      return "NOT_FOUND";
+      return ErrorCode.NOT_FOUND;
     case 409:
-      return "CONFLICT";
-    case 422:
-      return "UNPROCESSABLE_ENTITY";
+      return ErrorCode.ACCOUNT_EXISTS;
+    case 429:
+      return ErrorCode.RATE_LIMITED;
+    case 503:
+      return ErrorCode.SERVICE_UNAVAILABLE;
     default:
-      return status >= 500 ? "SERVER_ERROR" : `HTTP_${status}`;
+      return status >= 500 ? ErrorCode.INTERNAL_ERROR : ErrorCode.UNKNOWN;
   }
 }
+
+// ============================================================================
+// Convenience Functions
+// ============================================================================
+
+/**
+ * Get user-friendly error message from any error
+ */
+export function getErrorMessage(error: unknown): string {
+  return parseError(error).message;
+}
+
+/**
+ * Check if error should trigger logout
+ */
+export function shouldLogout(error: unknown): boolean {
+  return parseError(error).shouldLogout;
+}
+
+/**
+ * Check if error can be retried
+ */
+export function canRetry(error: unknown): boolean {
+  return parseError(error).shouldRetry;
+}
+
+/**
+ * Get error code from any error
+ */
+export function getErrorCode(error: unknown): ErrorCodeType {
+  return parseError(error).code;
+}
+
+// ============================================================================
+// Re-exports from domain package for convenience
+// ============================================================================
+
+export {
+  ErrorCode,
+  ErrorMessages,
+  ErrorMetadata,
+  matchErrorPattern,
+  type ErrorCodeType,
+} from "@customer-portal/domain/common";
diff --git a/apps/portal/src/lib/utils/index.ts b/apps/portal/src/lib/utils/index.ts
index e084d70d..02d16a5d 100644
--- a/apps/portal/src/lib/utils/index.ts
+++ b/apps/portal/src/lib/utils/index.ts
@@ -1,2 +1,12 @@
 export { cn } from "./cn";
-export { toUserMessage } from "./error-display";
+export {
+  parseError,
+  getErrorMessage,
+  shouldLogout,
+  canRetry,
+  getErrorCode,
+  ErrorCode,
+  ErrorMessages,
+  type ParsedError,
+  type ErrorCodeType,
+} from "./error-handling";
diff --git a/packages/domain/auth/forms.ts b/packages/domain/auth/forms.ts
new file mode 100644
index 00000000..053a2dfb
--- /dev/null
+++ b/packages/domain/auth/forms.ts
@@ -0,0 +1,76 @@
+/**
+ * Auth Domain - Form Utilities
+ *
+ * Business logic for password validation and strength checking.
+ * UI configurations (labels, placeholders) belong in the frontend.
+ */
+
+// ============================================================================
+// Password Requirements (Business Logic)
+// ============================================================================
+
+/**
+ * Password requirements - single source of truth for validation rules.
+ * Used by passwordSchema in common/schema.ts and for UI display.
+ */
+export const PASSWORD_REQUIREMENTS = [
+  { key: "minLength", label: "At least 8 characters", regex: /.{8,}/ },
+  { key: "uppercase", label: "One uppercase letter", regex: /[A-Z]/ },
+  { key: "lowercase", label: "One lowercase letter", regex: /[a-z]/ },
+  { key: "number", label: "One number", regex: /[0-9]/ },
+  { key: "special", label: "One special character", regex: /[^A-Za-z0-9]/ },
+] as const;
+
+export type PasswordRequirementKey = (typeof PASSWORD_REQUIREMENTS)[number]["key"];
+
+/**
+ * Check password strength against requirements
+ */
+export function checkPasswordStrength(password: string): {
+  requirements: Array<{ key: string; label: string; met: boolean }>;
+  strength: number;
+  isValid: boolean;
+} {
+  const requirements = PASSWORD_REQUIREMENTS.map(req => ({
+    key: req.key,
+    label: req.label,
+    met: req.regex.test(password),
+  }));
+
+  const metCount = requirements.filter(r => r.met).length;
+  const strength = (metCount / requirements.length) * 100;
+  const isValid = metCount === requirements.length;
+
+  return { requirements, strength, isValid };
+}
+
+/**
+ * Get password strength display label and color class
+ */
+export function getPasswordStrengthDisplay(strength: number): {
+  label: string;
+  colorClass: string;
+} {
+  if (strength >= 100) return { label: "Strong", colorClass: "bg-green-500" };
+  if (strength >= 80) return { label: "Good", colorClass: "bg-blue-500" };
+  if (strength >= 60) return { label: "Fair", colorClass: "bg-yellow-500" };
+  return { label: "Weak", colorClass: "bg-red-500" };
+}
+
+// ============================================================================
+// Migration Info (Business Constants)
+// ============================================================================
+
+export const MIGRATION_TRANSFER_ITEMS = [
+  "All active services",
+  "Billing history",
+  "Support tickets",
+  "Account details",
+] as const;
+
+export const MIGRATION_STEPS = [
+  "Enter your legacy portal email and password",
+  "We verify your account and migrate your data",
+  "Create a new secure password for the upgraded portal",
+  "Access your dashboard with all your services ready",
+] as const;
diff --git a/packages/domain/auth/index.ts b/packages/domain/auth/index.ts
index 938664f6..029425c5 100644
--- a/packages/domain/auth/index.ts
+++ b/packages/domain/auth/index.ts
@@ -57,7 +57,7 @@ export type {
 export {
   // Request schemas
   loginRequestSchema,
-  signupInputSchema,  // Base input schema for forms
+  signupInputSchema,
   signupRequestSchema,
   passwordResetRequestSchema,
   passwordResetSchema,
@@ -86,3 +86,16 @@ export {
 } from "./schema";
 
 export { buildSignupRequest } from "./helpers";
+
+// ============================================================================
+// Password Utilities
+// ============================================================================
+
+export {
+  PASSWORD_REQUIREMENTS,
+  checkPasswordStrength,
+  getPasswordStrengthDisplay,
+  MIGRATION_TRANSFER_ITEMS,
+  MIGRATION_STEPS,
+  type PasswordRequirementKey,
+} from "./forms";
diff --git a/packages/domain/catalog/contract.ts b/packages/domain/catalog/contract.ts
index c92d7422..0a6d56b6 100644
--- a/packages/domain/catalog/contract.ts
+++ b/packages/domain/catalog/contract.ts
@@ -50,6 +50,17 @@ export interface PricingTier {
   originalPrice?: number;
 }
 
+/**
+ * Standardized pricing display info
+ * Used for consistent price rendering across Frontend and BFF
+ */
+export interface CatalogPriceInfo {
+  display: string;
+  monthly: number | null;
+  oneTime: number | null;
+  currency: string;
+}
+
 /**
  * Catalog filtering options
  */
diff --git a/packages/domain/catalog/index.ts b/packages/domain/catalog/index.ts
index 1dd6b849..d35171fc 100644
--- a/packages/domain/catalog/index.ts
+++ b/packages/domain/catalog/index.ts
@@ -11,6 +11,7 @@ export {
   type SalesforceProductFieldMap,
   type PricingTier,
   type CatalogFilter,
+  type CatalogPriceInfo,
 } from "./contract";
 
 // Schemas (includes derived types)
diff --git a/packages/domain/catalog/utils.ts b/packages/domain/catalog/utils.ts
index 7bdee0e0..14edb7c3 100644
--- a/packages/domain/catalog/utils.ts
+++ b/packages/domain/catalog/utils.ts
@@ -8,7 +8,9 @@ import {
   type SimCatalogCollection,
   type VpnCatalogCollection,
   type InternetPlanTemplate,
+  type CatalogProductBase,
 } from "./schema";
+import type { CatalogPriceInfo } from "./contract";
 
 /**
  * Empty catalog defaults shared by portal and BFF.
@@ -156,3 +158,39 @@ export function enrichInternetPlanMetadata(plan: InternetPlanCatalogItem): Inter
 
 export const internetPlanCollectionSchema = internetPlanCatalogItemSchema.array();
 
+/**
+ * Calculates display price information for a catalog item
+ * Centralized logic for price formatting
+ */
+export function getCatalogProductPriceDisplay(item: CatalogProductBase): CatalogPriceInfo | null {
+  const monthlyPrice = item.monthlyPrice ?? null;
+  const oneTimePrice = item.oneTimePrice ?? null;
+  const currency = "JPY";
+
+  if (monthlyPrice === null && oneTimePrice === null) {
+    return null;
+  }
+
+  let display = "";
+  if (monthlyPrice !== null && monthlyPrice > 0) {
+    display = `¥${monthlyPrice.toLocaleString()}/month`;
+  } else if (oneTimePrice !== null && oneTimePrice > 0) {
+    display = `¥${oneTimePrice.toLocaleString()} (one-time)`;
+  }
+
+  return {
+    display,
+    monthly: monthlyPrice,
+    oneTime: oneTimePrice,
+    currency,
+  };
+}
+
+/**
+ * Calculate savings percentage between original and current price
+ * Returns 0 if there are no savings (current >= original)
+ */
+export function calculateSavingsPercentage(originalPrice: number, currentPrice: number): number {
+  if (originalPrice <= currentPrice) return 0;
+  return Math.round(((originalPrice - currentPrice) / originalPrice) * 100);
+}
diff --git a/packages/domain/common/errors.ts b/packages/domain/common/errors.ts
new file mode 100644
index 00000000..e0628f49
--- /dev/null
+++ b/packages/domain/common/errors.ts
@@ -0,0 +1,479 @@
+/**
+ * Unified Error Handling for Customer Portal
+ *
+ * Single source of truth for error codes and user-friendly messages.
+ * Used by both BFF (for generating responses) and Portal (for parsing responses).
+ */
+
+import { z } from "zod";
+
+// ============================================================================
+// Error Categories and Severity
+// ============================================================================
+
+export type ErrorCategory =
+  | "authentication"
+  | "authorization"
+  | "validation"
+  | "business"
+  | "system"
+  | "network";
+
+export type ErrorSeverity = "low" | "medium" | "high" | "critical";
+
+// ============================================================================
+// Error Code Registry
+// ============================================================================
+
+/**
+ * All error codes used in the application.
+ * Format: CATEGORY_NUMBER (e.g., AUTH_001, VAL_001)
+ */
+export const ErrorCode = {
+  // Authentication Errors (AUTH_*)
+  INVALID_CREDENTIALS: "AUTH_001",
+  ACCOUNT_LOCKED: "AUTH_002",
+  SESSION_EXPIRED: "AUTH_003",
+  TOKEN_INVALID: "AUTH_004",
+  TOKEN_REVOKED: "AUTH_005",
+  REFRESH_TOKEN_INVALID: "AUTH_006",
+
+  // Authorization Errors (AUTHZ_*)
+  FORBIDDEN: "AUTHZ_001",
+  ADMIN_REQUIRED: "AUTHZ_002",
+  RESOURCE_ACCESS_DENIED: "AUTHZ_003",
+
+  // Validation Errors (VAL_*)
+  VALIDATION_FAILED: "VAL_001",
+  REQUIRED_FIELD_MISSING: "VAL_002",
+  INVALID_FORMAT: "VAL_003",
+  NOT_FOUND: "VAL_004",
+
+  // Business Logic Errors (BIZ_*)
+  ACCOUNT_EXISTS: "BIZ_001",
+  ACCOUNT_ALREADY_LINKED: "BIZ_002",
+  CUSTOMER_NOT_FOUND: "BIZ_003",
+  ORDER_ALREADY_PROCESSED: "BIZ_004",
+  INSUFFICIENT_BALANCE: "BIZ_005",
+  SERVICE_UNAVAILABLE: "BIZ_006",
+
+  // System Errors (SYS_*)
+  INTERNAL_ERROR: "SYS_001",
+  EXTERNAL_SERVICE_ERROR: "SYS_002",
+  DATABASE_ERROR: "SYS_003",
+  CONFIGURATION_ERROR: "SYS_004",
+
+  // Network/Rate Limiting (NET_*)
+  NETWORK_ERROR: "NET_001",
+  TIMEOUT: "NET_002",
+  RATE_LIMITED: "NET_003",
+
+  // Generic
+  UNKNOWN: "GEN_001",
+} as const;
+
+export type ErrorCodeType = (typeof ErrorCode)[keyof typeof ErrorCode];
+
+// ============================================================================
+// Error Messages (User-Friendly)
+// ============================================================================
+
+/**
+ * User-friendly error messages for each error code.
+ * These are safe to display to end users.
+ */
+export const ErrorMessages: Record<ErrorCodeType, string> = {
+  // Authentication
+  [ErrorCode.INVALID_CREDENTIALS]: "Invalid email or password. Please try again.",
+  [ErrorCode.ACCOUNT_LOCKED]:
+    "Your account has been temporarily locked due to multiple failed login attempts. Please try again later.",
+  [ErrorCode.SESSION_EXPIRED]: "Your session has expired. Please log in again.",
+  [ErrorCode.TOKEN_INVALID]: "Your session is invalid. Please log in again.",
+  [ErrorCode.TOKEN_REVOKED]: "Your session has been revoked. Please log in again.",
+  [ErrorCode.REFRESH_TOKEN_INVALID]: "Your session could not be refreshed. Please log in again.",
+
+  // Authorization
+  [ErrorCode.FORBIDDEN]: "You do not have permission to perform this action.",
+  [ErrorCode.ADMIN_REQUIRED]: "Administrator access is required for this action.",
+  [ErrorCode.RESOURCE_ACCESS_DENIED]: "You do not have access to this resource.",
+
+  // Validation
+  [ErrorCode.VALIDATION_FAILED]: "The provided data is invalid. Please check your input.",
+  [ErrorCode.REQUIRED_FIELD_MISSING]: "Required information is missing.",
+  [ErrorCode.INVALID_FORMAT]: "The data format is invalid.",
+  [ErrorCode.NOT_FOUND]: "The requested resource was not found.",
+
+  // Business Logic
+  [ErrorCode.ACCOUNT_EXISTS]: "An account with this email already exists. Please sign in.",
+  [ErrorCode.ACCOUNT_ALREADY_LINKED]: "This billing account is already linked. Please sign in.",
+  [ErrorCode.CUSTOMER_NOT_FOUND]: "Customer account not found. Please contact support.",
+  [ErrorCode.ORDER_ALREADY_PROCESSED]: "This order has already been processed.",
+  [ErrorCode.INSUFFICIENT_BALANCE]: "Insufficient account balance.",
+  [ErrorCode.SERVICE_UNAVAILABLE]: "This service is temporarily unavailable. Please try again later.",
+
+  // System
+  [ErrorCode.INTERNAL_ERROR]: "An unexpected error occurred. Please try again later.",
+  [ErrorCode.EXTERNAL_SERVICE_ERROR]: "An external service is temporarily unavailable. Please try again later.",
+  [ErrorCode.DATABASE_ERROR]: "A system error occurred. Please try again later.",
+  [ErrorCode.CONFIGURATION_ERROR]: "A system configuration error occurred. Please contact support.",
+
+  // Network
+  [ErrorCode.NETWORK_ERROR]: "Unable to connect to the server. Please check your internet connection.",
+  [ErrorCode.TIMEOUT]: "The request timed out. Please try again.",
+  [ErrorCode.RATE_LIMITED]: "Too many requests. Please wait a moment and try again.",
+
+  // Generic
+  [ErrorCode.UNKNOWN]: "An unexpected error occurred. Please try again.",
+};
+
+// ============================================================================
+// Error Metadata
+// ============================================================================
+
+interface ErrorMetadata {
+  category: ErrorCategory;
+  severity: ErrorSeverity;
+  shouldLogout: boolean;
+  shouldRetry: boolean;
+  logLevel: "error" | "warn" | "info" | "debug";
+}
+
+/**
+ * Metadata for each error code defining behavior and classification.
+ */
+export const ErrorMetadata: Record<ErrorCodeType, ErrorMetadata> = {
+  // Authentication - mostly medium severity, some trigger logout
+  [ErrorCode.INVALID_CREDENTIALS]: {
+    category: "authentication",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "warn",
+  },
+  [ErrorCode.ACCOUNT_LOCKED]: {
+    category: "authentication",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "warn",
+  },
+  [ErrorCode.SESSION_EXPIRED]: {
+    category: "authentication",
+    severity: "low",
+    shouldLogout: true,
+    shouldRetry: false,
+    logLevel: "info",
+  },
+  [ErrorCode.TOKEN_INVALID]: {
+    category: "authentication",
+    severity: "medium",
+    shouldLogout: true,
+    shouldRetry: false,
+    logLevel: "warn",
+  },
+  [ErrorCode.TOKEN_REVOKED]: {
+    category: "authentication",
+    severity: "medium",
+    shouldLogout: true,
+    shouldRetry: false,
+    logLevel: "warn",
+  },
+  [ErrorCode.REFRESH_TOKEN_INVALID]: {
+    category: "authentication",
+    severity: "medium",
+    shouldLogout: true,
+    shouldRetry: false,
+    logLevel: "warn",
+  },
+
+  // Authorization
+  [ErrorCode.FORBIDDEN]: {
+    category: "authorization",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "warn",
+  },
+  [ErrorCode.ADMIN_REQUIRED]: {
+    category: "authorization",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "warn",
+  },
+  [ErrorCode.RESOURCE_ACCESS_DENIED]: {
+    category: "authorization",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "warn",
+  },
+
+  // Validation - low severity, informational
+  [ErrorCode.VALIDATION_FAILED]: {
+    category: "validation",
+    severity: "low",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "info",
+  },
+  [ErrorCode.REQUIRED_FIELD_MISSING]: {
+    category: "validation",
+    severity: "low",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "info",
+  },
+  [ErrorCode.INVALID_FORMAT]: {
+    category: "validation",
+    severity: "low",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "info",
+  },
+  [ErrorCode.NOT_FOUND]: {
+    category: "validation",
+    severity: "low",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "info",
+  },
+
+  // Business Logic
+  [ErrorCode.ACCOUNT_EXISTS]: {
+    category: "business",
+    severity: "low",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "info",
+  },
+  [ErrorCode.ACCOUNT_ALREADY_LINKED]: {
+    category: "business",
+    severity: "low",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "info",
+  },
+  [ErrorCode.CUSTOMER_NOT_FOUND]: {
+    category: "business",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "warn",
+  },
+  [ErrorCode.ORDER_ALREADY_PROCESSED]: {
+    category: "business",
+    severity: "low",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "info",
+  },
+  [ErrorCode.INSUFFICIENT_BALANCE]: {
+    category: "business",
+    severity: "low",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "info",
+  },
+  [ErrorCode.SERVICE_UNAVAILABLE]: {
+    category: "business",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: true,
+    logLevel: "warn",
+  },
+
+  // System - high severity
+  [ErrorCode.INTERNAL_ERROR]: {
+    category: "system",
+    severity: "high",
+    shouldLogout: false,
+    shouldRetry: true,
+    logLevel: "error",
+  },
+  [ErrorCode.EXTERNAL_SERVICE_ERROR]: {
+    category: "system",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: true,
+    logLevel: "error",
+  },
+  [ErrorCode.DATABASE_ERROR]: {
+    category: "system",
+    severity: "critical",
+    shouldLogout: false,
+    shouldRetry: true,
+    logLevel: "error",
+  },
+  [ErrorCode.CONFIGURATION_ERROR]: {
+    category: "system",
+    severity: "critical",
+    shouldLogout: false,
+    shouldRetry: false,
+    logLevel: "error",
+  },
+
+  // Network
+  [ErrorCode.NETWORK_ERROR]: {
+    category: "network",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: true,
+    logLevel: "warn",
+  },
+  [ErrorCode.TIMEOUT]: {
+    category: "network",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: true,
+    logLevel: "warn",
+  },
+  [ErrorCode.RATE_LIMITED]: {
+    category: "network",
+    severity: "low",
+    shouldLogout: false,
+    shouldRetry: true,
+    logLevel: "warn",
+  },
+
+  // Generic
+  [ErrorCode.UNKNOWN]: {
+    category: "system",
+    severity: "medium",
+    shouldLogout: false,
+    shouldRetry: true,
+    logLevel: "error",
+  },
+};
+
+// ============================================================================
+// Helper Functions
+// ============================================================================
+
+/**
+ * Get user-friendly message for an error code
+ */
+export function getErrorMessage(code: string): string {
+  return ErrorMessages[code as ErrorCodeType] ?? ErrorMessages[ErrorCode.UNKNOWN];
+}
+
+/**
+ * Get metadata for an error code
+ */
+export function getErrorMetadata(code: string): ErrorMetadata {
+  return ErrorMetadata[code as ErrorCodeType] ?? ErrorMetadata[ErrorCode.UNKNOWN];
+}
+
+/**
+ * Check if error code should trigger logout
+ */
+export function shouldLogoutForCode(code: string): boolean {
+  return getErrorMetadata(code).shouldLogout;
+}
+
+/**
+ * Check if error can be retried
+ */
+export function canRetryError(code: string): boolean {
+  return getErrorMetadata(code).shouldRetry;
+}
+
+// ============================================================================
+// Pattern Matching for Error Classification
+// ============================================================================
+
+interface ErrorPattern {
+  pattern: RegExp;
+  code: ErrorCodeType;
+}
+
+/**
+ * Patterns to match error messages to error codes.
+ * Used when explicit error codes are not available.
+ */
+export const ErrorPatterns: ErrorPattern[] = [
+  // Authentication patterns
+  { pattern: /invalid.*credentials?|wrong.*password|invalid.*password/i, code: ErrorCode.INVALID_CREDENTIALS },
+  { pattern: /account.*locked|locked.*account|too.*many.*attempts/i, code: ErrorCode.ACCOUNT_LOCKED },
+  { pattern: /session.*expired|expired.*session/i, code: ErrorCode.SESSION_EXPIRED },
+  { pattern: /token.*expired|expired.*token/i, code: ErrorCode.SESSION_EXPIRED },
+  { pattern: /token.*revoked|revoked.*token/i, code: ErrorCode.TOKEN_REVOKED },
+  { pattern: /invalid.*token|token.*invalid/i, code: ErrorCode.TOKEN_INVALID },
+  { pattern: /refresh.*token.*invalid|invalid.*refresh/i, code: ErrorCode.REFRESH_TOKEN_INVALID },
+
+  // Authorization patterns
+  { pattern: /admin.*required|requires?.*admin/i, code: ErrorCode.ADMIN_REQUIRED },
+  { pattern: /forbidden|not.*authorized|unauthorized/i, code: ErrorCode.FORBIDDEN },
+  { pattern: /access.*denied|permission.*denied/i, code: ErrorCode.RESOURCE_ACCESS_DENIED },
+
+  // Business patterns
+  { pattern: /already.*exists|email.*exists|account.*exists/i, code: ErrorCode.ACCOUNT_EXISTS },
+  { pattern: /already.*linked/i, code: ErrorCode.ACCOUNT_ALREADY_LINKED },
+  { pattern: /customer.*not.*found|account.*not.*found/i, code: ErrorCode.CUSTOMER_NOT_FOUND },
+  { pattern: /already.*processed/i, code: ErrorCode.ORDER_ALREADY_PROCESSED },
+  { pattern: /insufficient.*balance/i, code: ErrorCode.INSUFFICIENT_BALANCE },
+
+  // System patterns
+  { pattern: /database|sql|postgres|prisma|connection.*refused/i, code: ErrorCode.DATABASE_ERROR },
+  { pattern: /whmcs|salesforce|external.*service/i, code: ErrorCode.EXTERNAL_SERVICE_ERROR },
+  { pattern: /configuration.*error|missing.*config/i, code: ErrorCode.CONFIGURATION_ERROR },
+
+  // Network patterns
+  { pattern: /network.*error|fetch.*failed|econnrefused/i, code: ErrorCode.NETWORK_ERROR },
+  { pattern: /timeout|timed?\s*out/i, code: ErrorCode.TIMEOUT },
+  { pattern: /too.*many.*requests|rate.*limit/i, code: ErrorCode.RATE_LIMITED },
+
+  // Validation patterns (lower priority - checked last)
+  { pattern: /not.*found/i, code: ErrorCode.NOT_FOUND },
+  { pattern: /validation.*failed|invalid/i, code: ErrorCode.VALIDATION_FAILED },
+  { pattern: /required|missing/i, code: ErrorCode.REQUIRED_FIELD_MISSING },
+];
+
+/**
+ * Match an error message to an error code using patterns
+ */
+export function matchErrorPattern(message: string): ErrorCodeType {
+  for (const { pattern, code } of ErrorPatterns) {
+    if (pattern.test(message)) {
+      return code;
+    }
+  }
+  return ErrorCode.UNKNOWN;
+}
+
+// ============================================================================
+// Zod Schema for Error Response
+// ============================================================================
+
+/**
+ * Schema for standard API error response
+ */
+export const apiErrorSchema = z.object({
+  success: z.literal(false),
+  error: z.object({
+    code: z.string(),
+    message: z.string(),
+    details: z.record(z.string(), z.unknown()).optional(),
+  }),
+});
+
+export type ApiError = z.infer<typeof apiErrorSchema>;
+
+/**
+ * Create a standard error response object
+ */
+export function createErrorResponse(
+  code: ErrorCodeType,
+  customMessage?: string,
+  details?: Record<string, unknown>
+): ApiError {
+  return {
+    success: false,
+    error: {
+      code,
+      message: customMessage ?? getErrorMessage(code),
+      details,
+    },
+  };
+}
+
diff --git a/packages/domain/common/index.ts b/packages/domain/common/index.ts
index bdd94657..e1cb8bc1 100644
--- a/packages/domain/common/index.ts
+++ b/packages/domain/common/index.ts
@@ -1,12 +1,13 @@
 /**
  * Common Domain
- * 
+ *
  * Shared types and utilities used across all domains.
  */
 
 export * from "./types";
 export * from "./schema";
 export * from "./validation";
+export * from "./errors";
 
 // Common provider types (generic wrappers used across domains)
 export * as CommonProviders from "./providers/index";
diff --git a/packages/domain/dashboard/index.ts b/packages/domain/dashboard/index.ts
index 7dcfba10..293473c2 100644
--- a/packages/domain/dashboard/index.ts
+++ b/packages/domain/dashboard/index.ts
@@ -4,3 +4,4 @@
 
 export * from "./contract";
 export * from "./schema";
+export * from "./utils";
diff --git a/packages/domain/dashboard/utils.ts b/packages/domain/dashboard/utils.ts
new file mode 100644
index 00000000..99ef49bb
--- /dev/null
+++ b/packages/domain/dashboard/utils.ts
@@ -0,0 +1,104 @@
+/**
+ * Dashboard Domain Utilities
+ * Business logic for dashboard activities and task generation
+ */
+
+import type { Activity, ActivityFilter, ActivityFilterConfig, ActivityType } from "./contract";
+
+/**
+ * Activity filter configurations
+ * Defines which activity types belong to each filter category
+ */
+export const ACTIVITY_FILTERS: ActivityFilterConfig[] = [
+  { key: "all", label: "All" },
+  {
+    key: "billing",
+    label: "Billing",
+    types: ["invoice_created", "invoice_paid"],
+  },
+  {
+    key: "orders",
+    label: "Orders",
+    types: ["service_activated"],
+  },
+  {
+    key: "support",
+    label: "Support",
+    types: ["case_created", "case_closed"],
+  },
+];
+
+/**
+ * Filter activities by type category
+ */
+export function filterActivities(activities: Activity[], filter: ActivityFilter): Activity[] {
+  if (filter === "all") {
+    return activities;
+  }
+
+  const filterConfig = ACTIVITY_FILTERS.find(f => f.key === filter);
+  if (!filterConfig?.types) {
+    return activities;
+  }
+
+  return activities.filter(activity => filterConfig.types!.includes(activity.type));
+}
+
+/**
+ * Activity types that support navigation to detail views
+ */
+const CLICKABLE_ACTIVITY_TYPES: ActivityType[] = ["invoice_created", "invoice_paid"];
+
+/**
+ * Check if an activity is clickable (has a navigable detail view)
+ */
+export function isActivityClickable(activity: Activity): boolean {
+  return CLICKABLE_ACTIVITY_TYPES.includes(activity.type) && !!activity.relatedId;
+}
+
+/**
+ * Dashboard task definition
+ */
+export interface DashboardTask {
+  label: string;
+  href: string;
+}
+
+/**
+ * Dashboard summary input for task generation
+ */
+export interface DashboardTaskSummary {
+  nextInvoice?: { id: number } | null;
+  stats?: { unpaidInvoices?: number; openCases?: number };
+}
+
+/**
+ * Generate dashboard task suggestions based on summary data
+ */
+export function generateDashboardTasks(summary: DashboardTaskSummary): DashboardTask[] {
+  const tasks: DashboardTask[] = [];
+
+  if (summary.nextInvoice) {
+    tasks.push({
+      label: "Pay upcoming invoice",
+      href: "#attention",
+    });
+  }
+
+  if (summary.stats?.unpaidInvoices && summary.stats.unpaidInvoices > 0) {
+    tasks.push({
+      label: "Review unpaid invoices",
+      href: "/billing/invoices",
+    });
+  }
+
+  if (summary.stats?.openCases && summary.stats.openCases > 0) {
+    tasks.push({
+      label: "Check support cases",
+      href: "/support/cases",
+    });
+  }
+
+  return tasks;
+}
+
diff --git a/packages/domain/orders/utils.ts b/packages/domain/orders/utils.ts
index 271f2d19..6895338b 100644
--- a/packages/domain/orders/utils.ts
+++ b/packages/domain/orders/utils.ts
@@ -5,7 +5,7 @@ import {
   type CreateOrderRequest,
   type OrderSelections,
 } from "./schema";
-import { ORDER_TYPE } from "./contract";
+import { ORDER_TYPE, type CheckoutCart, type OrderTypeValue } from "./contract";
 
 export function buildOrderConfigurations(selections: OrderSelections): OrderConfigurations {
   const normalizedSelections = orderSelectionsSchema.parse(selections);
@@ -41,3 +41,38 @@ export function createOrderRequest(payload: {
   };
 }
 
+/**
+ * Transform CheckoutCart into CreateOrderRequest
+ * Handles SKU extraction, validation, and payload formatting
+ * 
+ * @throws Error if no products are selected
+ */
+export function prepareOrderFromCart(
+  cart: CheckoutCart,
+  orderType: OrderTypeValue
+): CreateOrderRequest {
+  const uniqueSkus = Array.from(
+    new Set(
+      cart.items
+        .map(item => item.sku)
+        .filter((sku): sku is string => typeof sku === "string" && sku.trim().length > 0)
+    )
+  );
+
+  if (uniqueSkus.length === 0) {
+    throw new Error("No products selected for order. Please go back and select products.");
+  }
+
+  // Note: Zod validation of the final structure should happen at the boundary or via schema.parse
+  // This function focuses on the structural transformation logic.
+  
+  const orderData: CreateOrderRequest = {
+    orderType,
+    skus: uniqueSkus,
+    ...(Object.keys(cart.configuration).length > 0
+      ? { configurations: cart.configuration }
+      : {}),
+  };
+
+  return orderData;
+}
diff --git a/packages/domain/support/contract.ts b/packages/domain/support/contract.ts
index dc6b927c..daf8efa0 100644
--- a/packages/domain/support/contract.ts
+++ b/packages/domain/support/contract.ts
@@ -2,26 +2,73 @@
  * Support Domain - Contract
  *
  * Constants for support case statuses, priorities, and categories.
+ * These are the DISPLAY values shown in the portal UI.
+ *
+ * Note: Salesforce uses Japanese API names internally (e.g., 新規, 対応中, 高, 中, 低)
+ * which are mapped to these English display values by the Salesforce mapper.
  */
 
+/**
+ * Portal display status values
+ * Mapped from Salesforce Japanese API names:
+ * - 新規 → New
+ * - 対応中 → In Progress
+ * - Awaiting Approval → Awaiting Approval
+ * - VPN Pending → VPN Pending
+ * - Pending → Pending
+ * - 完了済み → Resolved
+ * - Closed → Closed
+ */
 export const SUPPORT_CASE_STATUS = {
-  OPEN: "Open",
+  NEW: "New",
   IN_PROGRESS: "In Progress",
-  WAITING_ON_CUSTOMER: "Waiting on Customer",
+  AWAITING_APPROVAL: "Awaiting Approval",
+  VPN_PENDING: "VPN Pending",
+  PENDING: "Pending",
   RESOLVED: "Resolved",
   CLOSED: "Closed",
 } as const;
 
+/** Statuses that indicate a case is closed */
+export const CLOSED_STATUSES = [
+  SUPPORT_CASE_STATUS.VPN_PENDING,
+  SUPPORT_CASE_STATUS.PENDING,
+  SUPPORT_CASE_STATUS.RESOLVED,
+  SUPPORT_CASE_STATUS.CLOSED,
+] as const;
+
+/** Statuses that indicate a case is open */
+export const OPEN_STATUSES = [
+  SUPPORT_CASE_STATUS.NEW,
+  SUPPORT_CASE_STATUS.IN_PROGRESS,
+  SUPPORT_CASE_STATUS.AWAITING_APPROVAL,
+] as const;
+
+/**
+ * Portal display priority values
+ * Mapped from Salesforce Japanese API names:
+ * - 高 → High
+ * - 中 → Medium
+ * - 低 → Low
+ */
 export const SUPPORT_CASE_PRIORITY = {
   LOW: "Low",
   MEDIUM: "Medium",
   HIGH: "High",
-  CRITICAL: "Critical",
 } as const;
 
+/**
+ * Case categories map to Salesforce Case.Type field
+ * Note: Type picklist may not be configured in your org
+ */
 export const SUPPORT_CASE_CATEGORY = {
   TECHNICAL: "Technical",
   BILLING: "Billing",
   GENERAL: "General",
   FEATURE_REQUEST: "Feature Request",
 } as const;
+
+/**
+ * Portal Website origin - used to filter and create portal cases
+ */
+export const PORTAL_CASE_ORIGIN = "Portal Website" as const;
diff --git a/packages/domain/support/index.ts b/packages/domain/support/index.ts
index 3af533f8..b4a51315 100644
--- a/packages/domain/support/index.ts
+++ b/packages/domain/support/index.ts
@@ -1,7 +1,25 @@
+/**
+ * Support Domain
+ *
+ * Exports all support-related contracts, schemas, and provider mappers.
+ *
+ * Types are derived from Zod schemas (Schema-First Approach)
+ */
+
+// Business types and constants
 export {
   SUPPORT_CASE_STATUS,
   SUPPORT_CASE_PRIORITY,
   SUPPORT_CASE_CATEGORY,
+  PORTAL_CASE_ORIGIN,
 } from "./contract";
 
+// Schemas (includes derived types)
 export * from "./schema";
+
+// Provider adapters
+export * as Providers from "./providers/index";
+
+// Re-export provider types for convenience
+export * from "./providers/salesforce/raw.types";
+export * from "./providers/salesforce/mapper";
diff --git a/packages/domain/support/providers/index.ts b/packages/domain/support/providers/index.ts
new file mode 100644
index 00000000..fd193d44
--- /dev/null
+++ b/packages/domain/support/providers/index.ts
@@ -0,0 +1,18 @@
+/**
+ * Support Domain - Providers
+ */
+
+import * as SalesforceMapper from "./salesforce/mapper";
+import * as SalesforceRaw from "./salesforce/raw.types";
+
+export const Salesforce = {
+  ...SalesforceMapper,
+  ...SalesforceRaw,
+  mapper: SalesforceMapper,
+  raw: SalesforceRaw,
+};
+
+export { SalesforceMapper, SalesforceRaw };
+export * from "./salesforce/mapper";
+export * from "./salesforce/raw.types";
+
diff --git a/packages/domain/support/providers/salesforce/index.ts b/packages/domain/support/providers/salesforce/index.ts
new file mode 100644
index 00000000..0b14f2b7
--- /dev/null
+++ b/packages/domain/support/providers/salesforce/index.ts
@@ -0,0 +1,7 @@
+/**
+ * Support Domain - Salesforce Provider
+ */
+
+export * from "./raw.types";
+export * from "./mapper";
+
diff --git a/packages/domain/support/providers/salesforce/mapper.ts b/packages/domain/support/providers/salesforce/mapper.ts
new file mode 100644
index 00000000..857a35ab
--- /dev/null
+++ b/packages/domain/support/providers/salesforce/mapper.ts
@@ -0,0 +1,170 @@
+/**
+ * Support Domain - Salesforce Provider Mapper
+ *
+ * Transform functions to convert raw Salesforce Case records to domain types.
+ */
+
+import { supportCaseSchema, type SupportCase } from "../../schema";
+import type { SalesforceCaseRecord } from "./raw.types";
+import {
+  getStatusDisplayLabel,
+  getPriorityDisplayLabel,
+  SALESFORCE_CASE_STATUS,
+  SALESFORCE_CASE_PRIORITY,
+} from "./raw.types";
+
+// ============================================================================
+// Helper Functions
+// ============================================================================
+
+/**
+ * Safely coerce a value to string or return undefined
+ */
+function ensureString(value: unknown): string | undefined {
+  if (typeof value === "string" && value.length > 0) {
+    return value;
+  }
+  return undefined;
+}
+
+/**
+ * Get current ISO timestamp
+ */
+function nowIsoString(): string {
+  return new Date().toISOString();
+}
+
+// ============================================================================
+// Transform Functions
+// ============================================================================
+
+/**
+ * Transform a raw Salesforce Case record to a portal SupportCase.
+ *
+ * Converts Salesforce API values (often in Japanese) to portal display labels (English).
+ *
+ * @param record - Raw Salesforce Case record from SOQL query
+ * @returns Validated SupportCase domain object
+ */
+export function transformSalesforceCaseToSupportCase(
+  record: SalesforceCaseRecord
+): SupportCase {
+  // Get raw values
+  const rawStatus = ensureString(record.Status) ?? SALESFORCE_CASE_STATUS.NEW;
+  const rawPriority = ensureString(record.Priority) ?? SALESFORCE_CASE_PRIORITY.MEDIUM;
+
+  return supportCaseSchema.parse({
+    id: record.Id,
+    caseNumber: record.CaseNumber,
+    subject: ensureString(record.Subject) ?? "",
+    // Convert Japanese SF values to English display labels
+    status: getStatusDisplayLabel(rawStatus),
+    priority: getPriorityDisplayLabel(rawPriority),
+    category: ensureString(record.Type) ?? null,
+    description: ensureString(record.Description) ?? "",
+    createdAt: ensureString(record.CreatedDate) ?? nowIsoString(),
+    updatedAt: ensureString(record.LastModifiedDate) ?? nowIsoString(),
+    closedAt: ensureString(record.ClosedDate) ?? null,
+  });
+}
+
+/**
+ * Transform multiple Salesforce Case records to SupportCase array.
+ *
+ * @param records - Array of raw Salesforce Case records
+ * @returns Array of validated SupportCase domain objects
+ */
+export function transformSalesforceCasesToSupportCases(
+  records: SalesforceCaseRecord[]
+): SupportCase[] {
+  return records.map(transformSalesforceCaseToSupportCase);
+}
+
+/**
+ * Build the SOQL SELECT fields for Case queries.
+ *
+ * Standard Salesforce Case fields based on org configuration.
+ * Note: Type field is not accessible via API in this org.
+ *
+ * @param additionalFields - Optional additional fields to include
+ * @returns Array of field names for SOQL SELECT clause
+ */
+export function buildCaseSelectFields(additionalFields: string[] = []): string[] {
+  const baseFields = [
+    // Core identifiers
+    "Id",
+    "CaseNumber",
+
+    // Case content
+    "Subject",
+    "Description",
+
+    // Picklist fields
+    "Status",
+    "Priority",
+    "Origin",
+
+    // Relationships
+    "AccountId",
+    "ContactId",
+    "OwnerId",
+
+    // Timestamps
+    "CreatedDate",
+    "LastModifiedDate",
+    "ClosedDate",
+
+    // Flags
+    "IsEscalated",
+  ];
+
+  return [...new Set([...baseFields, ...additionalFields])];
+}
+
+/**
+ * Build a SOQL query for fetching cases for an account.
+ *
+ * @param accountId - Salesforce Account ID
+ * @param origin - Case origin to filter by (e.g., "Portal Website")
+ * @param additionalFields - Optional additional fields to include
+ * @returns SOQL query string
+ */
+export function buildCasesForAccountQuery(
+  accountId: string,
+  origin: string,
+  additionalFields: string[] = []
+): string {
+  const fields = buildCaseSelectFields(additionalFields).join(", ");
+  return `
+    SELECT ${fields}
+    FROM Case
+    WHERE AccountId = '${accountId}' AND Origin = '${origin}'
+    ORDER BY CreatedDate DESC
+    LIMIT 100
+  `.trim();
+}
+
+/**
+ * Build a SOQL query for fetching a single case by ID.
+ *
+ * @param caseId - Salesforce Case ID
+ * @param accountId - Salesforce Account ID (for ownership validation)
+ * @param origin - Case origin to filter by
+ * @param additionalFields - Optional additional fields to include
+ * @returns SOQL query string
+ */
+export function buildCaseByIdQuery(
+  caseId: string,
+  accountId: string,
+  origin: string,
+  additionalFields: string[] = []
+): string {
+  const fields = buildCaseSelectFields(additionalFields).join(", ");
+  return `
+    SELECT ${fields}
+    FROM Case
+    WHERE Id = '${caseId}' AND AccountId = '${accountId}' AND Origin = '${origin}'
+    LIMIT 1
+  `.trim();
+}
+
diff --git a/packages/domain/support/providers/salesforce/raw.types.ts b/packages/domain/support/providers/salesforce/raw.types.ts
new file mode 100644
index 00000000..e81c9e08
--- /dev/null
+++ b/packages/domain/support/providers/salesforce/raw.types.ts
@@ -0,0 +1,322 @@
+/**
+ * Support Domain - Salesforce Provider Raw Types
+ *
+ * Raw Salesforce API response types for Case sobject.
+ * These types represent the exact structure returned by Salesforce SOQL queries.
+ *
+ * Available Case fields in this org (standard fields used):
+ * - Id, CaseNumber, Subject, Status, Priority, Type, Description, Origin, Reason
+ * - AccountId, ContactId, OwnerId, ParentId
+ * - CreatedDate, ClosedDate (LastModifiedDate via LastModifiedById)
+ * - IsEscalated, IsClosedOnCreate, IsStopped
+ * - ContactEmail, ContactPhone, ContactMobile, ContactFax
+ */
+
+import { z } from "zod";
+
+// ============================================================================
+// Salesforce Case Record (Raw API Response)
+// ============================================================================
+
+/**
+ * Raw Salesforce Case record schema
+ *
+ * Represents the structure returned by SOQL queries on the Case object.
+ * All fields are optional/nullable to handle partial queries and Salesforce nulls.
+ */
+export const salesforceCaseRecordSchema = z.object({
+  // ─────────────────────────────────────────────────────────────────────────
+  // Standard Salesforce ID fields
+  // ─────────────────────────────────────────────────────────────────────────
+  Id: z.string(),
+  CaseNumber: z.string(),
+
+  // ─────────────────────────────────────────────────────────────────────────
+  // Core case fields (Picklists & Text)
+  // ─────────────────────────────────────────────────────────────────────────
+  Subject: z.string().nullable().optional(), // Text(255)
+  Status: z.string().nullable().optional(), // Picklist
+  Priority: z.string().nullable().optional(), // Picklist
+  Type: z.string().nullable().optional(), // Picklist - Maps to Category in portal
+  Description: z.string().nullable().optional(), // Long Text Area(32000)
+  Origin: z.string().nullable().optional(), // Picklist (Case Origin)
+  Reason: z.string().nullable().optional(), // Picklist (Case Reason)
+
+  // ─────────────────────────────────────────────────────────────────────────
+  // Relationship IDs (Lookups)
+  // ─────────────────────────────────────────────────────────────────────────
+  AccountId: z.string().nullable().optional(), // Lookup(Account)
+  ContactId: z.string().nullable().optional(), // Lookup(Contact)
+  OwnerId: z.string().nullable().optional(), // Lookup(User,Group)
+  ParentId: z.string().nullable().optional(), // Lookup(Case)
+  AssetId: z.string().nullable().optional(), // Lookup(Asset)
+  ProductId: z.string().nullable().optional(), // Lookup(Product)
+  EntitlementId: z.string().nullable().optional(), // Lookup(Entitlement)
+  ServiceContractId: z.string().nullable().optional(), // Lookup(Service Contract)
+  SourceId: z.string().nullable().optional(), // Lookup(Chat Transcript,Email Message,etc)
+
+  // ─────────────────────────────────────────────────────────────────────────
+  // Nested objects (from relationship queries)
+  // ─────────────────────────────────────────────────────────────────────────
+  Account: z
+    .object({
+      Id: z.string().optional(),
+      Name: z.string().nullable().optional(),
+    })
+    .nullable()
+    .optional(),
+
+  Contact: z
+    .object({
+      Id: z.string().optional(),
+      Name: z.string().nullable().optional(),
+      Email: z.string().nullable().optional(),
+    })
+    .nullable()
+    .optional(),
+
+  Owner: z
+    .object({
+      Id: z.string().optional(),
+      Name: z.string().nullable().optional(),
+    })
+    .nullable()
+    .optional(),
+
+  // ─────────────────────────────────────────────────────────────────────────
+  // Contact info fields (derived from Contact lookup)
+  // ─────────────────────────────────────────────────────────────────────────
+  ContactEmail: z.string().nullable().optional(), // Email
+  ContactPhone: z.string().nullable().optional(), // Phone
+  ContactMobile: z.string().nullable().optional(), // Phone
+  ContactFax: z.string().nullable().optional(), // Phone
+
+  // ─────────────────────────────────────────────────────────────────────────
+  // Timestamps
+  // ─────────────────────────────────────────────────────────────────────────
+  CreatedDate: z.string().nullable().optional(), // Date/Time Opened
+  LastModifiedDate: z.string().nullable().optional(), // Derived from LastModifiedById
+  ClosedDate: z.string().nullable().optional(), // Date/Time Closed
+  SlaStartDate: z.string().nullable().optional(), // SLA Policy Start Time
+  SlaExitDate: z.string().nullable().optional(), // SLA Policy End Time
+
+  // ─────────────────────────────────────────────────────────────────────────
+  // Boolean flags
+  // ─────────────────────────────────────────────────────────────────────────
+  IsEscalated: z.boolean().nullable().optional(), // Escalated checkbox
+  IsClosedOnCreate: z.boolean().nullable().optional(), // Closed When Created
+  IsStopped: z.boolean().nullable().optional(), // Stopped checkbox
+
+  // ─────────────────────────────────────────────────────────────────────────
+  // Other standard fields
+  // ─────────────────────────────────────────────────────────────────────────
+  Comments: z.string().nullable().optional(), // Internal Comments - Text Area(4000)
+  MilestoneStatus: z.string().nullable().optional(), // Text(30)
+  Language: z.string().nullable().optional(), // Picklist
+
+  // Web-to-Case fields
+  SuppliedName: z.string().nullable().optional(), // Web Name - Text(80)
+  SuppliedEmail: z.string().nullable().optional(), // Web Email - Email
+  SuppliedPhone: z.string().nullable().optional(), // Web Phone - Text(40)
+  SuppliedCompany: z.string().nullable().optional(), // Web Company - Text(80)
+
+  // ─────────────────────────────────────────────────────────────────────────
+  // Custom fields (org-specific)
+  // ─────────────────────────────────────────────────────────────────────────
+  // AI-related fields
+  Case_Concern_AI__c: z.string().nullable().optional(), // Text Area(255)
+  Case_Email_Summary__c: z.string().nullable().optional(), // Long Text Area(32768)
+  Summary_AI__c: z.string().nullable().optional(), // Long Text Area(32768)
+  Resolution_AI__c: z.string().nullable().optional(), // Long Text Area(32768)
+
+  // Other custom fields (add as needed)
+  Department__c: z.string().nullable().optional(), // Picklist
+  Comment__c: z.string().nullable().optional(), // Long Text Area(32768)
+  Notes__c: z.string().nullable().optional(), // Long Text Area(32768)
+});
+
+export type SalesforceCaseRecord = z.infer<typeof salesforceCaseRecordSchema>;
+
+// ============================================================================
+// Salesforce Case Create Payload
+// ============================================================================
+
+/**
+ * Payload schema for creating a new Case in Salesforce
+ *
+ * Uses Salesforce API names (Japanese) for Status and Priority defaults.
+ */
+export const salesforceCaseCreatePayloadSchema = z.object({
+  Subject: z.string(),
+  Description: z.string(),
+  Status: z.string().default("新規"), // Default: New (Japanese API name)
+  Priority: z.string().default("中"), // Default: Medium (Japanese API name)
+  Origin: z.string(),
+  Type: z.string().optional(),
+  AccountId: z.string(),
+  ContactId: z.string().optional(),
+});
+
+export type SalesforceCaseCreatePayload = z.infer<typeof salesforceCaseCreatePayloadSchema>;
+
+// ============================================================================
+// Salesforce Case Field Constants (Org-Specific Picklist Values)
+// ============================================================================
+
+/**
+ * Salesforce Case Origin picklist values
+ * API Names from Salesforce Setup > Object Manager > Case > Fields > Case Origin
+ */
+export const SALESFORCE_CASE_ORIGIN = {
+  // Portal origin (used for portal-created cases)
+  PORTAL_WEBSITE: "Portal Website",
+
+  // Phone/Email origins
+  PHONE: "電話", // Japanese: Phone
+  MAIL: "メール", // Japanese: Mail
+  EMAIL: "Email",
+  WEB: "Web",
+
+  // ChatBot origins
+  AS_CHATBOT: "AS ChatBot",
+  GENKI_CHATBOT: "Genki ChatBot",
+
+  // Messaging origins
+  WHATSAPP_CHAT: "WhatsApp Chat",
+  MESSENGER_CHAT: "Messenger Chat",
+
+  // Mail-specific origins
+  GENKI_MAIL: "Genki Mail",
+  BILLING_MAIL: "Billing Mail",
+  TECH_MAIL: "Tech Mail",
+  HELPDESK_MAIL: "Helpdesk Mail",
+  MESERATI_MAIL: "Meserati Mail",
+
+  // Other
+  WEB_URGENT_INQUIRY: "Web Urgent Inquiry",
+} as const;
+
+export type SalesforceCaseOrigin =
+  (typeof SALESFORCE_CASE_ORIGIN)[keyof typeof SALESFORCE_CASE_ORIGIN];
+
+/**
+ * Salesforce Case Status picklist values
+ * API Names from Salesforce Setup > Object Manager > Case > Fields > Status
+ *
+ * Closed statuses: VPN Pending, Pending, 完了済み (Replied)
+ * Open statuses: 新規 (New), 対応中 (Reply in Progress), Awaiting Approval
+ */
+export const SALESFORCE_CASE_STATUS = {
+  // Open statuses
+  NEW: "新規", // Japanese: New Email (Default)
+  IN_PROGRESS: "対応中", // Japanese: Reply in Progress
+  AWAITING_APPROVAL: "Awaiting Approval",
+
+  // Closed statuses
+  VPN_PENDING: "VPN Pending", // Closed
+  PENDING: "Pending", // Closed
+  REPLIED: "完了済み", // Japanese: Replied/Completed (Closed)
+  CLOSED: "Closed",
+} as const;
+
+export type SalesforceCaseStatus =
+  (typeof SALESFORCE_CASE_STATUS)[keyof typeof SALESFORCE_CASE_STATUS];
+
+/** Status values that indicate a case is closed */
+export const SALESFORCE_CLOSED_STATUSES: SalesforceCaseStatus[] = [
+  SALESFORCE_CASE_STATUS.VPN_PENDING,
+  SALESFORCE_CASE_STATUS.PENDING,
+  SALESFORCE_CASE_STATUS.REPLIED,
+  SALESFORCE_CASE_STATUS.CLOSED,
+];
+
+/** Status values that indicate a case is open */
+export const SALESFORCE_OPEN_STATUSES: SalesforceCaseStatus[] = [
+  SALESFORCE_CASE_STATUS.NEW,
+  SALESFORCE_CASE_STATUS.IN_PROGRESS,
+  SALESFORCE_CASE_STATUS.AWAITING_APPROVAL,
+];
+
+/**
+ * Salesforce Case Priority picklist values
+ * API Names from Salesforce Setup > Object Manager > Case > Fields > Priority
+ */
+export const SALESFORCE_CASE_PRIORITY = {
+  HIGH: "高", // Japanese: High
+  MEDIUM: "中", // Japanese: Medium (Default)
+  LOW: "低", // Japanese: Low
+  MEDIUM_EN: "Medium", // English Medium (also exists)
+} as const;
+
+export type SalesforceCasePriority =
+  (typeof SALESFORCE_CASE_PRIORITY)[keyof typeof SALESFORCE_CASE_PRIORITY];
+
+// ============================================================================
+// Portal Display Labels (for UI rendering)
+// ============================================================================
+
+/**
+ * Map Salesforce status API names to portal display labels
+ */
+export const STATUS_DISPLAY_LABELS: Record<string, string> = {
+  [SALESFORCE_CASE_STATUS.NEW]: "New",
+  [SALESFORCE_CASE_STATUS.IN_PROGRESS]: "In Progress",
+  [SALESFORCE_CASE_STATUS.AWAITING_APPROVAL]: "Awaiting Approval",
+  [SALESFORCE_CASE_STATUS.VPN_PENDING]: "VPN Pending",
+  [SALESFORCE_CASE_STATUS.PENDING]: "Pending",
+  [SALESFORCE_CASE_STATUS.REPLIED]: "Resolved",
+  [SALESFORCE_CASE_STATUS.CLOSED]: "Closed",
+};
+
+/**
+ * Map Salesforce priority API names to portal display labels
+ */
+export const PRIORITY_DISPLAY_LABELS: Record<string, string> = {
+  [SALESFORCE_CASE_PRIORITY.HIGH]: "High",
+  [SALESFORCE_CASE_PRIORITY.MEDIUM]: "Medium",
+  [SALESFORCE_CASE_PRIORITY.LOW]: "Low",
+  [SALESFORCE_CASE_PRIORITY.MEDIUM_EN]: "Medium",
+};
+
+/**
+ * Get display label for a status value
+ */
+export function getStatusDisplayLabel(status: string): string {
+  return STATUS_DISPLAY_LABELS[status] ?? status;
+}
+
+/**
+ * Get display label for a priority value
+ */
+export function getPriorityDisplayLabel(priority: string): string {
+  return PRIORITY_DISPLAY_LABELS[priority] ?? priority;
+}
+
+/**
+ * Check if a status indicates the case is closed
+ */
+export function isClosedStatus(status: string): boolean {
+  return SALESFORCE_CLOSED_STATUSES.includes(status as SalesforceCaseStatus);
+}
+
+// ============================================================================
+// Reverse Mapping (Portal Display → Salesforce API)
+// ============================================================================
+
+/**
+ * Map portal display priority to Salesforce API priority value
+ * Used when creating cases - converts "High" → "高", etc.
+ */
+const PRIORITY_TO_SALESFORCE: Record<string, string> = {
+  High: SALESFORCE_CASE_PRIORITY.HIGH, // "高"
+  Medium: SALESFORCE_CASE_PRIORITY.MEDIUM, // "中"
+  Low: SALESFORCE_CASE_PRIORITY.LOW, // "低"
+};
+
+/**
+ * Convert portal priority display value to Salesforce API value
+ */
+export function toSalesforcePriority(displayPriority: string): string {
+  return PRIORITY_TO_SALESFORCE[displayPriority] ?? SALESFORCE_CASE_PRIORITY.MEDIUM;
+}
+
diff --git a/packages/domain/support/schema.ts b/packages/domain/support/schema.ts
index 11dcfea6..42444ce6 100644
--- a/packages/domain/support/schema.ts
+++ b/packages/domain/support/schema.ts
@@ -5,19 +5,26 @@ import {
   SUPPORT_CASE_CATEGORY,
 } from "./contract";
 
+/**
+ * Portal status values (mapped from Salesforce Japanese API names)
+ */
 const supportCaseStatusValues = [
-  SUPPORT_CASE_STATUS.OPEN,
+  SUPPORT_CASE_STATUS.NEW,
   SUPPORT_CASE_STATUS.IN_PROGRESS,
-  SUPPORT_CASE_STATUS.WAITING_ON_CUSTOMER,
+  SUPPORT_CASE_STATUS.AWAITING_APPROVAL,
+  SUPPORT_CASE_STATUS.VPN_PENDING,
+  SUPPORT_CASE_STATUS.PENDING,
   SUPPORT_CASE_STATUS.RESOLVED,
   SUPPORT_CASE_STATUS.CLOSED,
 ] as const;
 
+/**
+ * Portal priority values (mapped from Salesforce Japanese API names)
+ */
 const supportCasePriorityValues = [
   SUPPORT_CASE_PRIORITY.LOW,
   SUPPORT_CASE_PRIORITY.MEDIUM,
   SUPPORT_CASE_PRIORITY.HIGH,
-  SUPPORT_CASE_PRIORITY.CRITICAL,
 ] as const;
 
 const supportCaseCategoryValues = [
@@ -31,17 +38,21 @@ export const supportCaseStatusSchema = z.enum(supportCaseStatusValues);
 export const supportCasePrioritySchema = z.enum(supportCasePriorityValues);
 export const supportCaseCategorySchema = z.enum(supportCaseCategoryValues);
 
+/**
+ * Support case schema - compatible with Salesforce Case object
+ * ID is a string (Salesforce ID format: 15 or 18 char alphanumeric)
+ */
 export const supportCaseSchema = z.object({
-  id: z.number().int().positive(),
+  id: z.string().min(15).max(18),
+  caseNumber: z.string(),
   subject: z.string().min(1),
-  status: supportCaseStatusSchema,
-  priority: supportCasePrioritySchema,
-  category: supportCaseCategorySchema,
+  status: z.string(), // Allow any status from Salesforce
+  priority: z.string(), // Allow any priority from Salesforce
+  category: z.string().nullable(), // Maps to Salesforce Type field
   createdAt: z.string(),
   updatedAt: z.string(),
-  lastReply: z.string().optional(),
+  closedAt: z.string().nullable(),
   description: z.string(),
-  assignedTo: z.string().optional(),
 });
 
 export const supportCaseSummarySchema = z.object({
@@ -58,13 +69,31 @@ export const supportCaseListSchema = z.object({
 
 export const supportCaseFilterSchema = z
   .object({
-    status: supportCaseStatusSchema.optional(),
-    priority: supportCasePrioritySchema.optional(),
-    category: supportCaseCategorySchema.optional(),
+    status: z.string().optional(),
+    priority: z.string().optional(),
+    category: z.string().optional(),
     search: z.string().trim().min(1).optional(),
   })
   .default({});
 
+/**
+ * Request schema for creating a new support case
+ */
+export const createCaseRequestSchema = z.object({
+  subject: z.string().min(1).max(255),
+  description: z.string().min(1).max(32000),
+  category: supportCaseCategorySchema.optional(),
+  priority: supportCasePrioritySchema.optional(),
+});
+
+/**
+ * Response schema for case creation
+ */
+export const createCaseResponseSchema = z.object({
+  id: z.string(),
+  caseNumber: z.string(),
+});
+
 export type SupportCaseStatus = z.infer<typeof supportCaseStatusSchema>;
 export type SupportCasePriority = z.infer<typeof supportCasePrioritySchema>;
 export type SupportCaseCategory = z.infer<typeof supportCaseCategorySchema>;
@@ -72,3 +101,5 @@ export type SupportCase = z.infer<typeof supportCaseSchema>;
 export type SupportCaseSummary = z.infer<typeof supportCaseSummarySchema>;
 export type SupportCaseList = z.infer<typeof supportCaseListSchema>;
 export type SupportCaseFilter = z.infer<typeof supportCaseFilterSchema>;
+export type CreateCaseRequest = z.infer<typeof createCaseRequestSchema>;
+export type CreateCaseResponse = z.infer<typeof createCaseResponseSchema>;