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diff --git a/docs/superpowers/plans/2026-07-29-forced-default-password-change.md b/docs/superpowers/plans/2026-07-29-forced-default-password-change.md
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+# Forced Default Password Change Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Require users who log in with `Cc@12345678` to change that default password from a non-dismissible home-page dialog and then sign in again.
+
+**Architecture:** Add a pure password-policy utility for the default-password trigger and the 8–16-character validation rule. Pass the login password through every successful login path to `MainPage`; it displays a reusable forced-change dialog after the first frame, calls the existing password API, and uses centralized logout to remove all credentials and session state.
+
+**Tech Stack:** Flutter, Dart, `flutter_test`, `SharedPreferences`, existing `AuthApi` and `SessionService`.
+
+---
+
+### Task 1: Add the password-policy utility
+
+**Files:**
+- Create: `lib/services/password_policy.dart`
+- Create: `test/services/password_policy_test.dart`
+
+- [ ] **Step 1: Write failing policy tests**
+
+```dart
+test('recognizes the configured default password', () {
+  expect(PasswordPolicy.requiresChange('Cc@12345678'), isTrue);
+  expect(PasswordPolicy.requiresChange('Cc@12345679'), isFalse);
+});
+
+test('accepts a valid password and rejects invalid character sets', () {
+  expect(PasswordPolicy.validate('Aa@12345'), isNull);
+  expect(PasswordPolicy.validate('Aa$12345'), isNotNull);
+});
+```
+
+- [ ] **Step 2: Run the policy tests to verify failure**
+
+Run: `flutter test test/services/password_policy_test.dart`
+
+Expected: FAIL because `PasswordPolicy` does not exist.
+
+- [ ] **Step 3: Implement the policy**
+
+```dart
+class PasswordPolicy {
+  static const defaultPassword = 'Cc@12345678';
+
+  static bool requiresChange(String? password) => password == defaultPassword;
+
+  static String? validate(String password) {
+    final valid = RegExp(r'^(?=.*[A-Z])(?=.*[a-z])(?=.*\d)(?=.*[!#@*&])[A-Za-z\d!#@*&]{8,16}$');
+    return valid.hasMatch(password) ? null : '密码长度为8-16位，且必须包含大写字母、小写字母、数字和特殊符号（!#@*&）。';
+  }
+}
+```
+
+- [ ] **Step 4: Run the policy tests to verify success**
+
+Run: `flutter test test/services/password_policy_test.dart`
+
+Expected: PASS.
+
+### Task 2: Add the reusable forced-change dialog
+
+**Files:**
+- Modify: `lib/customWidget/custom_alert_dialog.dart`
+- Create: `lib/pages/mine/force_change_password_dialog.dart`
+- Create: `test/pages/mine/force_change_password_dialog_test.dart`
+
+- [ ] **Step 1: Write failing widget tests**
+
+```dart
+await ForceChangePasswordDialog.show(
+  context,
+  oldPassword: 'Cc@12345678',
+  onUpdatePassword: (_, __) async => true,
+);
+expect(find.text('请修改默认密码'), findsOneWidget);
+```
+
+Verify the dialog cannot be dismissed by the back action, rejects invalid passwords without calling the updater, and returns success after a valid update.
+
+- [ ] **Step 2: Run the widget test to verify failure**
+
+Run: `flutter test test/pages/mine/force_change_password_dialog_test.dart`
+
+Expected: FAIL because the dialog API does not exist.
+
+- [ ] **Step 3: Implement dialog and alert extension**
+
+Add optional `customContent` and `onConfirmAsync` fields to `CustomAlertDialog`. Build the three password fields inside `ForceChangePasswordDialog`; use `force: true`, `PasswordPolicy.validate`, and an injected updater so the modal remains visible for validation or API failures.
+
+- [ ] **Step 4: Run the widget test to verify success**
+
+Run: `flutter test test/pages/mine/force_change_password_dialog_test.dart`
+
+Expected: PASS.
+
+### Task 3: Trigger forced change after every login path
+
+**Files:**
+- Modify: `lib/pages/main_tab.dart`
+- Modify: `lib/pages/user/login_page.dart`
+- Modify: `lib/pages/user/choose_userFirm_page.dart`
+- Create: `test/pages/main_tab_forced_password_change_test.dart`
+
+- [ ] **Step 1: Write a failing trigger test**
+
+```dart
+expect(MainPage.shouldForcePasswordChange('Cc@12345678'), isTrue);
+expect(MainPage.shouldForcePasswordChange('new-password'), isFalse);
+```
+
+- [ ] **Step 2: Run the trigger test to verify failure**
+
+Run: `flutter test test/pages/main_tab_forced_password_change_test.dart`
+
+Expected: FAIL because `MainPage.shouldForcePasswordChange` does not exist.
+
+- [ ] **Step 3: Implement the trigger and logout flow**
+
+Give `MainPage` optional `loginPassword` constructor data. Schedule the forced dialog after the first frame only when `PasswordPolicy.requiresChange(loginPassword)` is true. Submit `id`, current password, and new password through `AuthApi.changePassWord`; after success call `AuthService.logout()` and replace the route stack with `LoginPage`. Pass the entered password through direct login and selected-firm login.
+
+- [ ] **Step 4: Run the trigger test to verify success**
+
+Run: `flutter test test/pages/main_tab_forced_password_change_test.dart`
+
+Expected: PASS.
+
+### Task 4: Reuse policy and centralized logout in manual password changes
+
+**Files:**
+- Modify: `lib/pages/mine/mine_set_pwd_page.dart`
+- Modify: `lib/services/auth_service.dart`
+- Test: `test/services/password_policy_test.dart`
+
+- [ ] **Step 1: Extend policy tests for length boundaries**
+
+```dart
+test('rejects passwords outside the 8 to 16 character range', () {
+  expect(PasswordPolicy.validate('Aa@1234'), isNotNull);
+  expect(PasswordPolicy.validate('Aa@12345678901234'), isNotNull);
+});
+```
+
+- [ ] **Step 2: Run policy tests to verify failure**
+
+Run: `flutter test test/services/password_policy_test.dart`
+
+Expected: FAIL until exact length checking is implemented.
+
+- [ ] **Step 3: Share validation and credential cleanup**
+
+Replace `MineSetPwdPage`’s local validation with `PasswordPolicy.validate`. Change `AuthService.logout()` to remove `savePhone` and `savePass` in addition to its existing state, then use it after any successful manual password change.
+
+- [ ] **Step 4: Run policy tests to verify success**
+
+Run: `flutter test test/services/password_policy_test.dart`
+
+Expected: PASS.
+
+### Task 5: Format and verify
+
+**Files:**
+- Modify: all changed Dart files only for formatting
+
+- [ ] **Step 1: Format changed sources**
+
+Run: `dart format lib/services/password_policy.dart lib/services/auth_service.dart lib/customWidget/custom_alert_dialog.dart lib/pages/mine/force_change_password_dialog.dart lib/pages/mine/mine_set_pwd_page.dart lib/pages/main_tab.dart lib/pages/user/login_page.dart lib/pages/user/choose_userFirm_page.dart test/services/password_policy_test.dart test/pages/mine/force_change_password_dialog_test.dart test/pages/main_tab_forced_password_change_test.dart`
+
+- [ ] **Step 2: Run focused regression tests**
+
+Run: `flutter test test/services/password_policy_test.dart test/pages/mine/force_change_password_dialog_test.dart test/pages/main_tab_forced_password_change_test.dart test/services/session_service_test.dart`
+
+Expected: PASS with zero failures.
+
+- [ ] **Step 3: Run static analysis**
+
+Run: `flutter analyze lib/services/password_policy.dart lib/services/auth_service.dart lib/customWidget/custom_alert_dialog.dart lib/pages/mine/force_change_password_dialog.dart lib/pages/mine/mine_set_pwd_page.dart lib/pages/main_tab.dart lib/pages/user/login_page.dart lib/pages/user/choose_userFirm_page.dart`
+
+Expected: exit code 0, or only diagnostics demonstrably unrelated to changed code.
diff --git a/test/pages/main_tab_forced_password_change_test.dart b/test/pages/main_tab_forced_password_change_test.dart
new file mode 100644
index 0000000..365b1ea
--- /dev/null
+++ b/test/pages/main_tab_forced_password_change_test.dart
@@ -0,0 +1,10 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:qhd_prevention/pages/main_tab.dart';
+
+void main() {
+  test('requires a change only for the default password', () {
+    expect(MainPage.shouldForcePasswordChange('Cc@12345678'), isTrue);
+    expect(MainPage.shouldForcePasswordChange('new-password'), isFalse);
+    expect(MainPage.shouldForcePasswordChange(null), isFalse);
+  });
+}
diff --git a/test/pages/mine/force_change_password_dialog_test.dart b/test/pages/mine/force_change_password_dialog_test.dart
new file mode 100644
index 0000000..09a6b44
--- /dev/null
+++ b/test/pages/mine/force_change_password_dialog_test.dart
@@ -0,0 +1,92 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:qhd_prevention/pages/mine/force_change_password_dialog.dart';
+
+void main() {
+  testWidgets('requires a valid matching password before updating', (
+    tester,
+  ) async {
+    var updateCalls = 0;
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Builder(
+          builder:
+              (context) => TextButton(
+                onPressed:
+                    () => ForceChangePasswordDialog.show(
+                      context,
+                      oldPassword: 'Cc@12345678',
+                      onUpdatePassword: (_, __) async {
+                        updateCalls++;
+                        return true;
+                      },
+                    ),
+                child: const Text('open'),
+              ),
+        ),
+      ),
+    );
+
+    await tester.tap(find.text('open'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('请修改默认密码'), findsOneWidget);
+    final firstField = tester.widget<TextField>(find.byType(TextField).first);
+    final decoration = firstField.decoration!;
+    expect(decoration.border, isA<UnderlineInputBorder>());
+    expect(decoration.enabledBorder, isA<UnderlineInputBorder>());
+    expect(decoration.focusedBorder, isA<UnderlineInputBorder>());
+
+    await tester.binding.handlePopRoute();
+    await tester.pumpAndSettle();
+    expect(find.text('请修改默认密码'), findsOneWidget);
+
+    await tester.enterText(find.byType(TextField).at(1), 'Aa@12345');
+    await tester.enterText(find.byType(TextField).at(2), 'different');
+    await tester.tap(find.text('提交'));
+    await tester.pump();
+
+    expect(updateCalls, 0);
+    expect(find.text('新密码和确认密码不一致'), findsNothing);
+  });
+
+  testWidgets('submits a valid new password and closes the dialog', (
+    tester,
+  ) async {
+    String? submittedOldPassword;
+    String? submittedNewPassword;
+
+    await tester.pumpWidget(
+      MaterialApp(
+        home: Builder(
+          builder:
+              (context) => TextButton(
+                onPressed:
+                    () => ForceChangePasswordDialog.show(
+                      context,
+                      oldPassword: 'Cc@12345678',
+                      onUpdatePassword: (oldPassword, newPassword) async {
+                        submittedOldPassword = oldPassword;
+                        submittedNewPassword = newPassword;
+                        return true;
+                      },
+                    ),
+                child: const Text('open'),
+              ),
+        ),
+      ),
+    );
+
+    await tester.tap(find.text('open'));
+    await tester.pumpAndSettle();
+    await tester.enterText(find.byType(TextField).at(1), 'Aa@12345');
+    await tester.enterText(find.byType(TextField).at(2), 'Aa@12345');
+    await tester.tap(find.text('提交'));
+    await tester.pumpAndSettle();
+
+    expect(submittedOldPassword, 'Cc@12345678');
+    expect(submittedNewPassword, 'Aa@12345');
+    expect(find.text('请修改默认密码'), findsNothing);
+  });
+}
diff --git a/test/services/auth_service_test.dart b/test/services/auth_service_test.dart
new file mode 100644
index 0000000..1646626
--- /dev/null
+++ b/test/services/auth_service_test.dart
@@ -0,0 +1,16 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:qhd_prevention/services/auth_service.dart';
+
+void main() {
+  test('stops login processing when the login API reports failure', () {
+    expect(
+      AuthService.isLoginResponseSuccessful({
+        'success': false,
+        'errCode': 'BIZ_ERROR',
+        'errMessage': '解密失败',
+        'data': null,
+      }),
+      isFalse,
+    );
+  });
+}
diff --git a/test/services/password_policy_test.dart b/test/services/password_policy_test.dart
new file mode 100644
index 0000000..b3b7a78
--- /dev/null
+++ b/test/services/password_policy_test.dart
@@ -0,0 +1,19 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:qhd_prevention/services/password_policy.dart';
+
+void main() {
+  test('recognizes the configured default password', () {
+    expect(PasswordPolicy.requiresChange('Cc@12345678'), isTrue);
+    expect(PasswordPolicy.requiresChange('Cc@12345679'), isFalse);
+  });
+
+  test('accepts a valid password and rejects invalid character sets', () {
+    expect(PasswordPolicy.validate('Aa@12345'), isNull);
+    expect(PasswordPolicy.validate(r'Aa$12345'), isNotNull);
+  });
+
+  test('rejects passwords outside the 8 to 16 character range', () {
+    expect(PasswordPolicy.validate('Aa@1234'), isNotNull);
+    expect(PasswordPolicy.validate('Aa@12345678901234'), isNotNull);
+  });
+}
diff --git a/test/services/session_service_test.dart b/test/services/session_service_test.dart
new file mode 100644
index 0000000..fe85c0e
--- /dev/null
+++ b/test/services/session_service_test.dart
@@ -0,0 +1,11 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:qhd_prevention/services/SessionService.dart';
+
+void main() {
+  test('preserves the nine-company device-management flag from login data', () {
+    final user = UserData.fromJson({'nineCompanyFlag': true});
+
+    expect(user.nineCompanyFlag, isTrue);
+    expect(user.toJson()['nineCompanyFlag'], isTrue);
+  });
+}