diff --git a/apps/mobile/lib/app/theme.dart b/apps/mobile/lib/app/theme.dart
index 6d2fa5a..a27a5cd 100644
--- a/apps/mobile/lib/app/theme.dart
+++ b/apps/mobile/lib/app/theme.dart
@@ -10,9 +10,9 @@
 /// 与内容不做反色处理，沿用跟随系统的深浅色切换。容器色（secondary/
 /// primaryContainer 等）由种子色派生，与 #1A73E8 同系。
 ///
-/// 字阶（fontSize 走 TextScaler，随系统字体缩放）：22 页面标题 /
-/// 17 分组标题 / 16-14 正文 / 13-12 辅助。组件：主按钮高 48（区间
-/// 48-52）、输入框与按钮圆角 12、卡片圆角 16、Dialog 圆角 16、
+/// 字阶（fontSize 走 TextScaler，随系统字体缩放；UI-03 §3 校准）：24
+/// 页面标题 / 17 分组标题 / 16-14 正文 / 13-12 辅助。组件：主按钮高 48
+/// （区间 48-52）、输入框与按钮圆角 12、卡片圆角 16、Dialog 圆角 16、
 /// BottomSheet 顶部圆角 16。动效时长常量见 ui/tokens.dart。
 library;
 
@@ -211,7 +211,7 @@ abstract final class AppTheme {
     borderSide: BorderSide(color: color, width: width),
   );
 
-  /// 字阶（方案 §3.1）：22 页面标题 / 17 分组 / 16-14 正文 / 13-12 辅助。
+  /// 字阶（UI-03 §3）：24 页面标题 / 17 分组 / 16-14 正文 / 13-12 辅助。
   ///
   /// 只声明 fontSize/字重/颜色，字体族与缩放交给默认排版 + TextScaler
   /// （fontSize 随系统字体大小缩放）。
@@ -220,7 +220,7 @@ abstract final class AppTheme {
     final onSecondaryText = scheme.onSurfaceVariant;
     return TextTheme(
       titleLarge: TextStyle(
-        fontSize: 22,
+        fontSize: 24,
         fontWeight: FontWeight.w600,
         color: onSurface,
       ),
diff --git a/apps/mobile/lib/l10n/app_en.arb b/apps/mobile/lib/l10n/app_en.arb
index ff35b9f..a8863e9 100644
--- a/apps/mobile/lib/l10n/app_en.arb
+++ b/apps/mobile/lib/l10n/app_en.arb
@@ -37,6 +37,16 @@
   "albumUploadsOff": "Uploads off",
   "albumPublicOff": "Not public",
   "loginHint": "Sign in with your staff account",
+  "loginTitle": "Your event. In focus.",
+  "loginSubtitle": "Sign in to manage albums and photos",
+  "loginAskAdmin": "Ask admin for account",
+  "loginShowPassword": "Show password",
+  "loginHidePassword": "Hide password",
+  "languageDone": "Done",
+  "passwordSecurityHint": "Choose a new password with at least 8 characters.",
+  "passwordSave": "Save password",
+  "settingsSectionGeneral": "General",
+  "logoutConfirmBodyIdle": "You will be signed out on this device.",
   "fieldRequired": "This field is required",
   "passwordChangeTitle": "Change password",
   "currentPassword": "Current password",
diff --git a/apps/mobile/lib/l10n/app_localizations.dart b/apps/mobile/lib/l10n/app_localizations.dart
index b658397..656213a 100644
--- a/apps/mobile/lib/l10n/app_localizations.dart
+++ b/apps/mobile/lib/l10n/app_localizations.dart
@@ -314,6 +314,66 @@ abstract class AppLocalizations {
   /// **'使用工作人员账号登录'**
   String get loginHint;
 
+  /// No description provided for @loginTitle.
+  ///
+  /// In zh, this message translates to:
+  /// **'记录每个精彩瞬间。'**
+  String get loginTitle;
+
+  /// No description provided for @loginSubtitle.
+  ///
+  /// In zh, this message translates to:
+  /// **'登录以管理相册和照片'**
+  String get loginSubtitle;
+
+  /// No description provided for @loginAskAdmin.
+  ///
+  /// In zh, this message translates to:
+  /// **'请向管理员获取账号'**
+  String get loginAskAdmin;
+
+  /// No description provided for @loginShowPassword.
+  ///
+  /// In zh, this message translates to:
+  /// **'显示密码'**
+  String get loginShowPassword;
+
+  /// No description provided for @loginHidePassword.
+  ///
+  /// In zh, this message translates to:
+  /// **'隐藏密码'**
+  String get loginHidePassword;
+
+  /// No description provided for @languageDone.
+  ///
+  /// In zh, this message translates to:
+  /// **'完成'**
+  String get languageDone;
+
+  /// No description provided for @passwordSecurityHint.
+  ///
+  /// In zh, this message translates to:
+  /// **'请设置至少 8 个字符的新密码。'**
+  String get passwordSecurityHint;
+
+  /// No description provided for @passwordSave.
+  ///
+  /// In zh, this message translates to:
+  /// **'保存密码'**
+  String get passwordSave;
+
+  /// No description provided for @settingsSectionGeneral.
+  ///
+  /// In zh, this message translates to:
+  /// **'通用'**
+  String get settingsSectionGeneral;
+
+  /// No description provided for @logoutConfirmBodyIdle.
+  ///
+  /// In zh, this message translates to:
+  /// **'将在此设备上退出登录。'**
+  String get logoutConfirmBodyIdle;
+
   /// No description provided for @fieldRequired.
   ///
   /// In zh, this message translates to:
diff --git a/apps/mobile/lib/l10n/app_localizations_en.dart b/apps/mobile/lib/l10n/app_localizations_en.dart
index 265d55e..e53e7f5 100644
--- a/apps/mobile/lib/l10n/app_localizations_en.dart
+++ b/apps/mobile/lib/l10n/app_localizations_en.dart
@@ -120,6 +120,37 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get loginHint => 'Sign in with your staff account';
 
+  @override
+  String get loginTitle => 'Your event. In focus.';
+
+  @override
+  String get loginSubtitle => 'Sign in to manage albums and photos';
+
+  @override
+  String get loginAskAdmin => 'Ask admin for account';
+
+  @override
+  String get loginShowPassword => 'Show password';
+
+  @override
+  String get loginHidePassword => 'Hide password';
+
+  @override
+  String get languageDone => 'Done';
+
+  @override
+  String get passwordSecurityHint =>
+      'Choose a new password with at least 8 characters.';
+
+  @override
+  String get passwordSave => 'Save password';
+
+  @override
+  String get settingsSectionGeneral => 'General';
+
+  @override
+  String get logoutConfirmBodyIdle => 'You will be signed out on this device.';
+
   @override
   String get fieldRequired => 'This field is required';
 
diff --git a/apps/mobile/lib/l10n/app_localizations_zh.dart b/apps/mobile/lib/l10n/app_localizations_zh.dart
index 34d34f6..afacf19 100644
--- a/apps/mobile/lib/l10n/app_localizations_zh.dart
+++ b/apps/mobile/lib/l10n/app_localizations_zh.dart
@@ -119,6 +119,36 @@ class AppLocalizationsZh extends AppLocalizations {
   @override
   String get loginHint => '使用工作人员账号登录';
 
+  @override
+  String get loginTitle => '记录每个精彩瞬间。';
+
+  @override
+  String get loginSubtitle => '登录以管理相册和照片';
+
+  @override
+  String get loginAskAdmin => '请向管理员获取账号';
+
+  @override
+  String get loginShowPassword => '显示密码';
+
+  @override
+  String get loginHidePassword => '隐藏密码';
+
+  @override
+  String get languageDone => '完成';
+
+  @override
+  String get passwordSecurityHint => '请设置至少 8 个字符的新密码。';
+
+  @override
+  String get passwordSave => '保存密码';
+
+  @override
+  String get settingsSectionGeneral => '通用';
+
+  @override
+  String get logoutConfirmBodyIdle => '将在此设备上退出登录。';
+
   @override
   String get fieldRequired => '此项为必填项';
 
diff --git a/apps/mobile/lib/l10n/app_zh.arb b/apps/mobile/lib/l10n/app_zh.arb
index 886b361..326442f 100644
--- a/apps/mobile/lib/l10n/app_zh.arb
+++ b/apps/mobile/lib/l10n/app_zh.arb
@@ -37,6 +37,16 @@
   "albumUploadsOff": "上传已关闭",
   "albumPublicOff": "未公开",
   "loginHint": "使用工作人员账号登录",
+  "loginTitle": "记录每个精彩瞬间。",
+  "loginSubtitle": "登录以管理相册和照片",
+  "loginAskAdmin": "请向管理员获取账号",
+  "loginShowPassword": "显示密码",
+  "loginHidePassword": "隐藏密码",
+  "languageDone": "完成",
+  "passwordSecurityHint": "请设置至少 8 个字符的新密码。",
+  "passwordSave": "保存密码",
+  "settingsSectionGeneral": "通用",
+  "logoutConfirmBodyIdle": "将在此设备上退出登录。",
   "fieldRequired": "此项为必填项",
   "passwordChangeTitle": "修改密码",
   "currentPassword": "当前密码",
diff --git a/apps/mobile/lib/pages/home_page.dart b/apps/mobile/lib/pages/home_page.dart
index 9ae4699..2860e05 100644
--- a/apps/mobile/lib/pages/home_page.dart
+++ b/apps/mobile/lib/pages/home_page.dart
@@ -6,6 +6,7 @@ import '../core/api_client.dart';
 import '../features/uploads/engine_scope.dart';
 import '../features/uploads/queue_controller.dart';
 import '../l10n/app_localizations.dart';
+import '../ui/components/language_sheet.dart';
 import '../ui/components/section_header.dart';
 import '../ui/tokens.dart';
 import 'albums_tab.dart';
@@ -92,9 +93,15 @@ class _UploadTabIcon extends StatelessWidget {
   }
 }
 
-/// 设置页（UI-01 §4.5 分组重构）：账号 / 语言 / 安全（改密 + 退出）/
-/// 上传帮助 / 关于（版本）。退出登录确认弹窗明确「本机任务保留，重新
-/// 登录后继续」——不承诺退出后后台继续上传。
+/// 设置页（UI-03 页面 02 重设计，图01）：账号摘要卡（首字母头像 + 账号）
+/// → 通用分组（Language / Change password / Upload help / App version）
+/// → 退出登录（低强调红色，单独分离）。
+///
+/// 账号卡不是「编辑资料」入口（无编辑功能，无导航箭头）；会话契约无
+/// 自身显示名/角色字段，卡片只展示真实可得的账号。语言行显示档位
+/// 自身名称；版本取 [kAppVersion]。上传帮助为本地说明面板（不承诺
+/// 后台百分百持续）。退出若存在进行中任务，确认弹窗明确任务保留、
+/// 重新登录后继续——不承诺退出后后台继续上传。
 class SettingsTab extends ConsumerWidget {
   const SettingsTab({super.key});
 
@@ -106,49 +113,67 @@ class SettingsTab extends ConsumerWidget {
         AppLocaleChoice.en => l10n.localeEnglish,
       };
 
-  Future<void> _pickLocale(
-    BuildContext context,
-    WidgetRef ref,
-    AppLocaleChoice current,
-  ) {
+  /// 上传帮助面板（本地说明：网络等待/系统后台限制/强退恢复）。
+  Future<void> _showUploadHelp(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    final theme = Theme.of(context);
     return showModalBottomSheet<void>(
       context: context,
       showDragHandle: true,
-      builder: (sheetContext) {
-        final l10n = AppLocalizations.of(sheetContext);
-        // 打开时刻的快照即可：选中即 pop，无滞留期间的陈旧选中态。
-        return SafeArea(
-          child: RadioGroup<AppLocaleChoice>(
-            groupValue: current,
-            onChanged: (choice) {
-              if (choice == null) return;
-              ref.read(localeSettingsProvider.notifier).setChoice(choice);
-              Navigator.of(sheetContext).pop();
-            },
+      builder: (sheetContext) => SafeArea(
+        top: false,
+        child: SingleChildScrollView(
+          // 长文案/大字体下允许滚动，面板不做固定高度。
+          child: Padding(
+            padding: const EdgeInsets.fromLTRB(
+              kSpace24, 0, kSpace24, kSpace24,
+            ),
             child: Column(
               mainAxisSize: MainAxisSize.min,
+              crossAxisAlignment: CrossAxisAlignment.stretch,
               children: [
-                for (final choice in AppLocaleChoice.values)
-                  RadioListTile<AppLocaleChoice>(
-                    value: choice,
-                    title: Text(_choiceLabel(l10n, choice)),
+                Text(
+                  l10n.settingsUploadHelpTitle,
+                  style: theme.textTheme.titleMedium,
+                ),
+                const SizedBox(height: kSpace12),
+                Text(
+                  l10n.settingsUploadHelpBody,
+                  style: theme.textTheme.bodyMedium?.copyWith(
+                    color: theme.colorScheme.onSurfaceVariant,
+                    height: 1.5,
                   ),
+                ),
+                const SizedBox(height: kSpace16),
+                FilledButton(
+                  onPressed: () => Navigator.of(sheetContext).pop(),
+                  child: Text(l10n.ok),
+                ),
               ],
             ),
           ),
-        );
-      },
+        ),
+      ),
     );
   }
 
-  /// 退出确认：明确本地任务保留、重新登录后继续（不承诺后台继续上传）。
-  Future<void> _confirmLogout(BuildContext context, WidgetRef ref) async {
+  /// 退出确认：有进行中任务时明确本地任务保留、重新登录后继续
+  /// （不承诺后台继续上传）；无任务时为常规确认。
+  Future<void> _confirmLogout(
+    BuildContext context,
+    WidgetRef ref,
+    int unfinishedTasks,
+  ) async {
     final l10n = AppLocalizations.of(context);
     final confirmed = await showDialog<bool>(
       context: context,
       builder: (dialogContext) => AlertDialog(
         title: Text(l10n.logoutConfirmTitle),
-        content: Text(l10n.logoutConfirmBody),
+        content: Text(
+          unfinishedTasks > 0
+              ? l10n.logoutConfirmBody
+              : l10n.logoutConfirmBodyIdle,
+        ),
         actions: [
           TextButton(
             onPressed: () => Navigator.of(dialogContext).pop(false),
@@ -177,96 +202,119 @@ class SettingsTab extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final l10n = AppLocalizations.of(context);
-    final theme = Theme.of(context);
     final choice = ref.watch(localeSettingsProvider);
     final account = ref.watch(sessionAccountProvider).value;
+    // 进行中任务数（底部导航角标同口径）：退出确认文案分流。
+    final unfinishedTasks = ref.watch(uploadBadgeCountProvider);
+    final theme = Theme.of(context);
     return Scaffold(
       appBar: AppBar(title: Text(l10n.settings)),
       body: ListView(
-        padding: const EdgeInsets.symmetric(vertical: kSpace8)
-            .copyWith(bottom: kSpace16),
+        padding: const EdgeInsets.fromLTRB(0, kSpace8, 0, kSpace24),
         children: [
-          // ── 账号 ────────────────────────────────────────────────
+          // ── 账号摘要卡（只读展示，非编辑入口） ─────────────────
           Padding(
             padding: const EdgeInsets.fromLTRB(
-              kSpace16, kSpace16, kSpace16, kSpace8,
+              kSpace16, kSpace8, kSpace16, kSpace8,
             ),
             child: SectionHeader(title: l10n.settingsSectionAccount),
           ),
-          ListTile(
-            leading: const Icon(Icons.person_outline),
-            title: Text(account ?? l10n.notSet),
-            subtitle: Text(l10n.settingsSignedInAccount),
+          Card(
+            margin: const EdgeInsets.symmetric(horizontal: kSpace16),
+            child: Padding(
+              padding: const EdgeInsets.all(kSpace16),
+              child: Row(
+                children: [
+                  _AccountAvatar(account: account),
+                  const SizedBox(width: kSpace16),
+                  Expanded(
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
+                        Text(
+                          account ?? l10n.notSet,
+                          maxLines: 1,
+                          overflow: TextOverflow.ellipsis,
+                          style: theme.textTheme.titleSmall,
+                        ),
+                        const SizedBox(height: kSpace4),
+                        Text(
+                          l10n.settingsSignedInAccount,
+                          style: theme.textTheme.bodySmall,
+                        ),
+                      ],
+                    ),
+                  ),
+                ],
+              ),
+            ),
           ),
-          // ── 语言 ────────────────────────────────────────────────
+          // ── 通用：语言 / 改密 / 上传帮助 / 版本 ──────────────────
           Padding(
             padding: const EdgeInsets.fromLTRB(
-              kSpace16, kSpace16, kSpace16, kSpace8,
+              kSpace16, kSpace24, kSpace16, kSpace8,
             ),
-            child: SectionHeader(title: l10n.settingsSectionLanguage),
+            child: SectionHeader(title: l10n.settingsSectionGeneral),
           ),
-          // 分组已名「语言」，行标题直接显示当前档位（避免同名重复）。
-          ListTile(
-            leading: const Icon(Icons.language),
-            title: Text(_choiceLabel(l10n, choice)),
-            trailing: const Icon(Icons.chevron_right),
-            onTap: () => _pickLocale(context, ref, choice),
-          ),
-          // ── 安全：改密 + 退出（确认后清会话） ────────────────────
-          Padding(
-            padding: const EdgeInsets.fromLTRB(
-              kSpace16, kSpace16, kSpace16, kSpace8,
-            ),
-            child: SectionHeader(title: l10n.settingsSectionSecurity),
-          ),
-          ListTile(
-            leading: const Icon(Icons.password_outlined),
-            title: Text(l10n.passwordChangeTitle),
-            onTap: () => Navigator.of(context).pushNamed('/password-change'),
-          ),
-          ListTile(
-            leading: const Icon(Icons.logout),
-            title: Text(l10n.logout),
-            onTap: () => _confirmLogout(context, ref),
-          ),
-          // ── 上传帮助：系统限制 / 强退 / 网络等待三分态说明 ────────
-          Padding(
-            padding: const EdgeInsets.fromLTRB(
-              kSpace16, kSpace16, kSpace16, kSpace8,
-            ),
-            child: SectionHeader(title: l10n.settingsSectionUploadHelp),
-          ),
-          ExpansionTile(
-            leading: const Icon(Icons.help_outline),
-            title: Text(l10n.settingsUploadHelpTitle),
-            children: [
-              Padding(
-                padding: const EdgeInsets.fromLTRB(
-                  kSpace16, 0, kSpace16, kSpace16,
+          Card(
+            margin: const EdgeInsets.symmetric(horizontal: kSpace16),
+            clipBehavior: Clip.antiAlias,
+            child: Column(
+              children: [
+                _SettingsRow(
+                  icon: Icons.language,
+                  label: l10n.language,
+                  trailing: Text(
+                    _choiceLabel(l10n, choice),
+                    style: theme.textTheme.bodyMedium?.copyWith(
+                      color: theme.colorScheme.onSurfaceVariant,
+                    ),
+                  ),
+                  chevron: true,
+                  onTap: () => showLanguageSheet(context),
                 ),
-                child: Text(
-                  l10n.settingsUploadHelpBody,
-                  style: theme.textTheme.bodySmall?.copyWith(
-                    color: theme.colorScheme.onSurfaceVariant,
+                const Divider(indent: kSpace16, endIndent: kSpace16),
+                _SettingsRow(
+                  icon: Icons.password_outlined,
+                  label: l10n.passwordChangeTitle,
+                  chevron: true,
+                  onTap: () =>
+                      Navigator.of(context).pushNamed('/password-change'),
+                ),
+                const Divider(indent: kSpace16, endIndent: kSpace16),
+                _SettingsRow(
+                  icon: Icons.help_outline,
+                  label: l10n.settingsSectionUploadHelp,
+                  chevron: true,
+                  onTap: () => _showUploadHelp(context),
+                ),
+                const Divider(indent: kSpace16, endIndent: kSpace16),
+                _SettingsRow(
+                  icon: Icons.info_outline,
+                  label: l10n.settingsVersion,
+                  trailing: Text(
+                    kAppVersion,
+                    style: theme.textTheme.bodyMedium?.copyWith(
+                      color: theme.colorScheme.onSurfaceVariant,
+                    ),
                   ),
                 ),
-              ),
-            ],
-          ),
-          // ── 关于：版本 ──────────────────────────────────────────
-          Padding(
-            padding: const EdgeInsets.fromLTRB(
-              kSpace16, kSpace16, kSpace16, kSpace8,
+              ],
             ),
-            child: SectionHeader(title: l10n.settingsSectionAbout),
           ),
-          ListTile(
-            leading: const Icon(Icons.info_outline),
-            title: Text(l10n.settingsVersion),
-            trailing: Text(
-              kAppVersion,
-              style: theme.textTheme.bodyMedium?.copyWith(
-                color: theme.colorScheme.onSurfaceVariant,
+          // ── 退出登录：低强调红色，与常规分组分离 ─────────────────
+          Padding(
+            padding: const EdgeInsets.only(top: kSpace24),
+            child: Align(
+              alignment: Alignment.center,
+              child: TextButton(
+                style: TextButton.styleFrom(
+                  foregroundColor: theme.colorScheme.error,
+                  minimumSize: const Size(48, 48),
+                ),
+                onPressed: () =>
+                    _confirmLogout(context, ref, unfinishedTasks),
+                child: Text(l10n.logout),
               ),
             ),
           ),
@@ -275,3 +323,89 @@ class SettingsTab extends ConsumerWidget {
     );
   }
 }
+
+/// 账号首字母头像占位（无真实头像数据；缺失回退「?」）。
+class _AccountAvatar extends StatelessWidget {
+  const _AccountAvatar({required this.account});
+
+  final String? account;
+
+  @override
+  Widget build(BuildContext context) {
+    final scheme = Theme.of(context).colorScheme;
+    final initial = (account == null || account!.isEmpty)
+        ? '?'
+        : account!.characters.first.toUpperCase();
+    return CircleAvatar(
+      radius: 24,
+      backgroundColor: scheme.primary,
+      foregroundColor: scheme.onPrimary,
+      child: Text(
+        initial,
+        style: Theme.of(context).textTheme.titleMedium,
+      ),
+    );
+  }
+}
+
+/// 设置行：图标 + 标题 + 可选尾值/箭头，触控高 ≥48。
+class _SettingsRow extends StatelessWidget {
+  const _SettingsRow({
+    required this.icon,
+    required this.label,
+    this.trailing,
+    this.chevron = false,
+    this.onTap,
+  });
+
+  final IconData icon;
+  final String label;
+  final Widget? trailing;
+
+  /// 是否显示导航箭头（仅可进入的行显示）。
+  final bool chevron;
+  final VoidCallback? onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    final scheme = Theme.of(context).colorScheme;
+    return InkWell(
+      onTap: onTap,
+      child: ConstrainedBox(
+        constraints: const BoxConstraints(minHeight: 56),
+        child: Padding(
+          padding: const EdgeInsets.symmetric(
+            horizontal: kSpace16,
+            vertical: kSpace12,
+          ),
+          child: Row(
+            children: [
+              Icon(icon, size: 24, color: scheme.onSurfaceVariant),
+              const SizedBox(width: kSpace16),
+              Expanded(
+                child: Text(
+                  label,
+                  maxLines: 1,
+                  overflow: TextOverflow.ellipsis,
+                  style: Theme.of(context).textTheme.bodyLarge,
+                ),
+              ),
+              if (trailing != null) ...[
+                const SizedBox(width: kSpace8),
+                trailing!,
+              ],
+              if (chevron) ...[
+                const SizedBox(width: kSpace4),
+                Icon(
+                  Icons.chevron_right,
+                  size: 24,
+                  color: scheme.onSurfaceVariant,
+                ),
+              ],
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
diff --git a/apps/mobile/lib/pages/login_page.dart b/apps/mobile/lib/pages/login_page.dart
index 569134b..ad5afb4 100644
--- a/apps/mobile/lib/pages/login_page.dart
+++ b/apps/mobile/lib/pages/login_page.dart
@@ -1,10 +1,12 @@
-/// 登录页（UI-01 §4.5 主题统一，P3 计划 Task 3 基础）。
+/// 登录页（UI-03 页面 01 重设计，图01）。
 ///
-/// 账号/密码表单 → [ApiClient.login]（会话由客户端自动持久化到
-/// SessionStore）→ 成功 pushReplacement /home；失败以内联 StateBadge
-/// （图标 + 文案 + 错误色）展示错误码本地化文案（AUTH_RATE_LIMITED 文案
-/// 自带「稍后再试」；网络/校验错误各有专属文案）。提交期间按钮进入
-/// 加载态防重复提交。
+/// 结构：摄影拼贴顶部（渐变占位）→ 品牌 → 主标题（l10n `loginTitle`）
+/// → 简短说明 → 账号/密码（显示/隐藏切换）→ Sign in → 管理员提供账号
+/// 说明；右上角语言选择（复用 [showLanguageSheet]）。
+///
+/// 拼贴高度随可用高度自适应（正常 25%-32%；短屏/键盘开启时压缩），
+/// 整页可滚动；提交期间禁用防重复，失败在表单附近以 StateBadge 展示
+/// 错误码本地化文案。无注册/飞书/找回密码入口。
 library;
 
 import 'package:flutter/material.dart';
@@ -15,6 +17,7 @@ import '../core/app_exception.dart';
 import '../core/error_l10n.dart';
 import '../features/uploads/engine_scope.dart';
 import '../l10n/app_localizations.dart';
+import '../ui/components/language_sheet.dart';
 import '../ui/components/state_badge.dart';
 import '../ui/tokens.dart';
 
@@ -32,6 +35,7 @@ class _LoginPageState extends ConsumerState<LoginPage> {
   final _passwordController = TextEditingController();
 
   bool _submitting = false;
+  bool _obscurePassword = true;
 
   /// 最近一次提交失败文案（内联 StateBadge 展示；null = 无错误）。
   String? _errorText;
@@ -72,69 +76,311 @@ class _LoginPageState extends ConsumerState<LoginPage> {
 
   @override
   Widget build(BuildContext context) {
+    final theme = Theme.of(context);
     final l10n = AppLocalizations.of(context);
     return Scaffold(
-      appBar: AppBar(title: Text(l10n.appName)),
-      body: Center(
-        child: ConstrainedBox(
-          constraints: const BoxConstraints(maxWidth: 420),
-          child: Padding(
-            padding: const EdgeInsets.all(kSpace24),
-            child: Form(
-              key: _formKey,
-              autovalidateMode: AutovalidateMode.onUserInteraction,
-              child: Column(
-                mainAxisAlignment: MainAxisAlignment.center,
-                crossAxisAlignment: CrossAxisAlignment.stretch,
-                children: [
-                  TextFormField(
-                    controller: _accountController,
-                    autofillHints: const [AutofillHints.username],
-                    decoration: InputDecoration(labelText: l10n.username),
-                    validator: (value) =>
-                        (value == null || value.trim().isEmpty)
-                            ? l10n.fieldRequired
-                            : null,
-                  ),
-                  const SizedBox(height: kSpace16),
-                  TextFormField(
-                    controller: _passwordController,
-                    obscureText: true,
-                    enableSuggestions: false,
-                    autocorrect: false,
-                    autofillHints: const [AutofillHints.password],
-                    onFieldSubmitted: (_) => _submitting ? null : _submit(),
-                    decoration: InputDecoration(labelText: l10n.password),
-                    validator: (value) => (value == null || value.isEmpty)
-                        ? l10n.fieldRequired
-                        : null,
-                  ),
-                  if (_errorText != null) ...[
-                    const SizedBox(height: kSpace16),
-                    StateBadge(
-                      variant: BadgeVariant.error,
-                      label: _errorText!,
+      // 顶部拼贴通到状态栏后（无 AppBar）；键盘由 Scaffold 默认压缩 body。
+      body: SafeArea(
+        top: false,
+        child: LayoutBuilder(
+          builder: (context, constraints) {
+            final keyboardOpen =
+                MediaQuery.of(context).viewInsets.bottom > 0;
+            // 正常高度 28%（25%-32% 区间）；键盘/短屏压缩至 10%。
+            final headerHeight = (constraints.maxHeight *
+                    (keyboardOpen ? 0.10 : 0.28))
+                .clamp(96.0, 320.0);
+            return SingleChildScrollView(
+              child: ConstrainedBox(
+                constraints: BoxConstraints(
+                  minHeight: constraints.maxHeight,
+                ),
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.stretch,
+                  mainAxisSize: MainAxisSize.min,
+                  children: [
+                    _CollageHeader(height: headerHeight),
+                    Padding(
+                      padding: const EdgeInsets.fromLTRB(
+                        kSpace24, kSpace24, kSpace24, kSpace24,
+                      ),
+                      child: ConstrainedBox(
+                        constraints:
+                            const BoxConstraints(maxWidth: 460),
+                        child: Form(
+                          key: _formKey,
+                          autovalidateMode:
+                              AutovalidateMode.onUserInteraction,
+                          child: Column(
+                            crossAxisAlignment:
+                                CrossAxisAlignment.stretch,
+                            children: [
+                              _BrandRow(),
+                              const SizedBox(height: kSpace16),
+                              Text(
+                                l10n.loginTitle,
+                                style: theme.textTheme.titleLarge,
+                              ),
+                              const SizedBox(height: kSpace8),
+                              Text(
+                                l10n.loginSubtitle,
+                                style: theme.textTheme.bodyMedium?.copyWith(
+                                  color: theme.colorScheme.onSurfaceVariant,
+                                ),
+                              ),
+                              const SizedBox(height: kSpace24),
+                              TextFormField(
+                                controller: _accountController,
+                                autofillHints: const [
+                                  AutofillHints.username,
+                                ],
+                                textInputAction: TextInputAction.next,
+                                decoration: InputDecoration(
+                                  labelText: l10n.username,
+                                ),
+                                validator: (value) => (value == null ||
+                                        value.trim().isEmpty)
+                                    ? l10n.fieldRequired
+                                    : null,
+                              ),
+                              const SizedBox(height: kSpace16),
+                              TextFormField(
+                                controller: _passwordController,
+                                obscureText: _obscurePassword,
+                                enableSuggestions: false,
+                                autocorrect: false,
+                                autofillHints: const [
+                                  AutofillHints.password,
+                                ],
+                                textInputAction: TextInputAction.done,
+                                onFieldSubmitted: (_) =>
+                                    _submitting ? null : _submit(),
+                                decoration: InputDecoration(
+                                  labelText: l10n.password,
+                                  suffixIcon: Tooltip(
+                                    message: _obscurePassword
+                                        ? l10n.loginShowPassword
+                                        : l10n.loginHidePassword,
+                                    child: IconButton(
+                                      onPressed: () => setState(
+                                        () => _obscurePassword =
+                                            !_obscurePassword,
+                                      ),
+                                      icon: Icon(
+                                        _obscurePassword
+                                            ? Icons.visibility_outlined
+                                            : Icons
+                                                .visibility_off_outlined,
+                                        size: 24,
+                                      ),
+                                    ),
+                                  ),
+                                ),
+                                validator: (value) => (value == null ||
+                                        value.isEmpty)
+                                    ? l10n.fieldRequired
+                                    : null,
+                              ),
+                              if (_errorText != null) ...[
+                                const SizedBox(height: kSpace16),
+                                StateBadge(
+                                  variant: BadgeVariant.error,
+                                  label: _errorText!,
+                                ),
+                              ],
+                              const SizedBox(height: kSpace24),
+                              FilledButton(
+                                onPressed: _submitting ? null : _submit,
+                                child: _submitting
+                                    ? const SizedBox(
+                                        height: 20,
+                                        width: 20,
+                                        child: CircularProgressIndicator(
+                                          strokeWidth: 2,
+                                        ),
+                                      )
+                                    : Text(l10n.login),
+                              ),
+                              const SizedBox(height: kSpace12),
+                              Text(
+                                l10n.loginAskAdmin,
+                                textAlign: TextAlign.center,
+                                style: theme.textTheme.bodySmall?.copyWith(
+                                  color:
+                                      theme.colorScheme.onSurfaceVariant,
+                                ),
+                              ),
+                            ],
+                          ),
+                        ),
+                      ),
                     ),
                   ],
-                  const SizedBox(height: kSpace24),
-                  FilledButton(
-                    onPressed: _submitting ? null : _submit,
-                    child: _submitting
-                        ? const SizedBox(
-                            height: 20,
-                            width: 20,
-                            child: CircularProgressIndicator(strokeWidth: 2),
-                          )
-                        : Text(l10n.login),
-                  ),
-                  const SizedBox(height: kSpace12),
-                  Text(
-                    l10n.loginHint,
-                    textAlign: TextAlign.center,
-                    style: Theme.of(context).textTheme.bodySmall,
-                  ),
-                ],
+                ),
               ),
+            );
+          },
+        ),
+      ),
+    );
+  }
+}
+
+/// 摄影拼贴顶部（渐变 + 半透明照片色块占位）+ 右上语言选择入口。
+///
+/// TODO(brand-asset): 换用项目正式品牌/摄影素材（UI-03 §3.1：不得裁切
+/// 设计板图片作背景；当前为可替换的中性渐变占位，不依赖远程图库）。
+class _CollageHeader extends StatelessWidget {
+  const _CollageHeader({required this.height});
+
+  /// 占位高度（调用方按可用高度/键盘状态计算）。
+  final double height;
+
+  /// 拼贴占位（测试定位用）。
+  static const Key collageKey = Key('login-collage');
+
+  @override
+  Widget build(BuildContext context) {
+    final scheme = Theme.of(context).colorScheme;
+    final soft = Color.lerp(scheme.primary, scheme.surface, 0.55);
+    return SizedBox(
+      height: height,
+      child: Stack(
+        children: [
+          // 渐变拼贴占位（浅深色均由语义色派生，不硬编码白 token）。
+          Container(
+            key: collageKey,
+            decoration: BoxDecoration(
+              gradient: LinearGradient(
+                begin: Alignment.topLeft,
+                end: Alignment.bottomRight,
+                colors: [scheme.primary, soft!],
+              ),
+            ),
+          ),
+          // 半透明「照片」色块（模拟拼贴节奏的装饰，可整体替换）。
+          Positioned(
+            left: 28,
+            top: 24,
+            child: _tile(120, 84, Colors.white.withValues(alpha: 0.16),
+                rotate: -0.08),
+          ),
+          Positioned(
+            right: 44,
+            top: 40,
+            child: _tile(132, 92, Colors.white.withValues(alpha: 0.12),
+                rotate: 0.06),
+          ),
+          Positioned(
+            left: 96,
+            bottom: 18,
+            child: _tile(150, 72, Colors.white.withValues(alpha: 0.10),
+                rotate: -0.04),
+          ),
+          // 右上语言选择（浮于拼贴之上）。
+          Positioned(
+            top: MediaQuery.paddingOf(context).top + 8,
+            right: kSpace12,
+            child: const _LanguagePill(),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Widget _tile(double width, double height, Color color,
+      {double rotate = 0}) {
+    return Transform.rotate(
+      angle: rotate,
+      child: Container(
+        width: width,
+        height: height,
+        decoration: BoxDecoration(
+          color: color,
+          borderRadius: BorderRadius.circular(kRadiusInput),
+        ),
+      ),
+    );
+  }
+}
+
+/// 品牌行：小 logo 点 + 产品名（沿用现有 appName，不新增 slogan）。
+class _BrandRow extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    return Row(
+      children: [
+        Container(
+          width: 32,
+          height: 32,
+          decoration: BoxDecoration(
+            color: theme.colorScheme.primary,
+            borderRadius: BorderRadius.circular(10),
+          ),
+          child: Icon(
+            Icons.photo_camera_outlined,
+            size: 18,
+            color: theme.colorScheme.onPrimary,
+          ),
+        ),
+        const SizedBox(width: kSpace12),
+        Text(
+          AppLocalizations.of(context).appName,
+          style: theme.textTheme.titleSmall?.copyWith(
+            color: theme.colorScheme.onSurfaceVariant,
+          ),
+        ),
+      ],
+    );
+  }
+}
+
+/// 语言选择胶囊（显示当前生效语言简称，点开共享语言面板）。
+class _LanguagePill extends StatelessWidget {
+  const _LanguagePill();
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final l10n = AppLocalizations.of(context);
+    final isZh =
+        Localizations.maybeLocaleOf(context)?.languageCode == 'zh';
+    return Semantics(
+      label: l10n.language,
+      button: true,
+      child: Material(
+        color: theme.colorScheme.surface.withValues(alpha: 0.92),
+        borderRadius: BorderRadius.circular(20),
+        child: InkWell(
+          onTap: () => showLanguageSheet(context),
+          borderRadius: BorderRadius.circular(20),
+          child: Padding(
+            padding: const EdgeInsets.symmetric(
+              horizontal: kSpace12,
+              vertical: kSpace8,
+            ),
+            child: Row(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                Icon(
+                  Icons.language,
+                  size: 18,
+                  color: theme.colorScheme.onSurface,
+                ),
+                const SizedBox(width: kSpace4),
+                Text(
+                  isZh ? '中文' : 'EN',
+                  style: theme.textTheme.labelMedium?.copyWith(
+                    color: theme.colorScheme.onSurface,
+                  ),
+                ),
+                Icon(
+                  Icons.arrow_drop_down,
+                  size: 18,
+                  color: theme.colorScheme.onSurfaceVariant,
+                ),
+              ],
             ),
           ),
         ),
diff --git a/apps/mobile/lib/pages/password_change_page.dart b/apps/mobile/lib/pages/password_change_page.dart
index 34788fa..9e19a78 100644
--- a/apps/mobile/lib/pages/password_change_page.dart
+++ b/apps/mobile/lib/pages/password_change_page.dart
@@ -1,10 +1,12 @@
-/// 修改密码页（UI-01 §4.5 主题统一，P3 计划 Task 3 基础；入口在设置页）。
+/// 修改密码页（UI-03 页面 03 重设计，图01；入口在设置页）。
 ///
-/// 当前/新/确认三字段；客户端校验（新密码 ≥8 位、两次一致）先行，
-/// 服务端 [ApiClient.changePassword] 成功后 204——当前会话被服务端保留，
+/// 返回标题 + 简短安全提示 + 当前/新/确认三字段 + Save password。
+/// 客户端校验（新密码 ≥8 位、两次一致）先行——新密码变更时若确认字段
+/// 已填写会即时复验（不匹配当场提示）；服务端
+/// [ApiClient.changePassword] 成功后 204——当前会话被服务端保留，
 /// 无需重登录：toast 提示后直接 pop 回设置页。失败以内联 StateBadge
 /// （图标 + 文案 + 错误色）展示；AUTH_INVALID_CREDENTIALS 在本页语义为
-/// 「当前密码错误」（覆写通用映射）。
+/// 「当前密码错误」（覆写通用映射）。提交中防重复。
 library;
 
 import 'package:flutter/material.dart';
@@ -33,14 +35,29 @@ class _PasswordChangePageState extends ConsumerState<PasswordChangePage> {
   final _newController = TextEditingController();
   final _confirmController = TextEditingController();
 
-  bool _obscureAll = true;
+  bool _obscureOld = true;
+  bool _obscureNew = true;
+  bool _obscureConfirm = true;
   bool _submitting = false;
 
   /// 最近一次提交失败文案（内联 StateBadge 展示；null = 无错误）。
   String? _errorText;
 
+  @override
+  void initState() {
+    super.initState();
+    // 新密码变更 → 确认字段已填写时即时复验（不匹配当场提示，不等提交）。
+    _newController.addListener(_revalidateConfirm);
+  }
+
+  void _revalidateConfirm() {
+    if (_confirmController.text.isEmpty) return;
+    _formKey.currentState?.validate();
+  }
+
   @override
   void dispose() {
+    _newController.removeListener(_revalidateConfirm);
     _oldController.dispose();
     _newController.dispose();
     _confirmController.dispose();
@@ -85,6 +102,7 @@ class _PasswordChangePageState extends ConsumerState<PasswordChangePage> {
   @override
   Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context);
+    final theme = Theme.of(context);
     return Scaffold(
       appBar: AppBar(title: Text(l10n.passwordChangeTitle)),
       body: Center(
@@ -97,16 +115,30 @@ class _PasswordChangePageState extends ConsumerState<PasswordChangePage> {
                 key: _formKey,
                 autovalidateMode: AutovalidateMode.onUserInteraction,
                 child: Column(
-                  mainAxisAlignment: MainAxisAlignment.center,
                   crossAxisAlignment: CrossAxisAlignment.stretch,
                   children: [
+                    Text(
+                      l10n.passwordSecurityHint,
+                      style: theme.textTheme.bodySmall?.copyWith(
+                        color: theme.colorScheme.onSurfaceVariant,
+                      ),
+                    ),
+                    const SizedBox(height: kSpace16),
                     TextFormField(
                       controller: _oldController,
-                      obscureText: _obscureAll,
+                      obscureText: _obscureOld,
                       enableSuggestions: false,
                       autocorrect: false,
+                      textInputAction: TextInputAction.next,
+                      autofillHints: const [AutofillHints.password],
                       decoration: InputDecoration(
                         labelText: l10n.currentPassword,
+                        suffixIcon: _visibilityToggle(
+                          obscure: _obscureOld,
+                          onPressed: () => setState(
+                            () => _obscureOld = !_obscureOld,
+                          ),
+                        ),
                       ),
                       validator: (value) => (value == null || value.isEmpty)
                           ? l10n.fieldRequired
@@ -115,11 +147,19 @@ class _PasswordChangePageState extends ConsumerState<PasswordChangePage> {
                     const SizedBox(height: kSpace16),
                     TextFormField(
                       controller: _newController,
-                      obscureText: _obscureAll,
+                      obscureText: _obscureNew,
                       enableSuggestions: false,
                       autocorrect: false,
+                      textInputAction: TextInputAction.next,
+                      autofillHints: const [AutofillHints.newPassword],
                       decoration: InputDecoration(
                         labelText: l10n.newPassword,
+                        suffixIcon: _visibilityToggle(
+                          obscure: _obscureNew,
+                          onPressed: () => setState(
+                            () => _obscureNew = !_obscureNew,
+                          ),
+                        ),
                       ),
                       validator: (value) {
                         if (value == null || value.isEmpty) {
@@ -132,12 +172,20 @@ class _PasswordChangePageState extends ConsumerState<PasswordChangePage> {
                     const SizedBox(height: kSpace16),
                     TextFormField(
                       controller: _confirmController,
-                      obscureText: _obscureAll,
+                      obscureText: _obscureConfirm,
                       enableSuggestions: false,
                       autocorrect: false,
+                      textInputAction: TextInputAction.done,
+                      autofillHints: const [AutofillHints.newPassword],
                       onFieldSubmitted: (_) => _submitting ? null : _submit(),
                       decoration: InputDecoration(
                         labelText: l10n.confirmNewPassword,
+                        suffixIcon: _visibilityToggle(
+                          obscure: _obscureConfirm,
+                          onPressed: () => setState(
+                            () => _obscureConfirm = !_obscureConfirm,
+                          ),
+                        ),
                       ),
                       validator: (value) {
                         if (value == null || value.isEmpty) {
@@ -149,27 +197,14 @@ class _PasswordChangePageState extends ConsumerState<PasswordChangePage> {
                         return null;
                       },
                     ),
-                    const SizedBox(height: kSpace8),
-                    Align(
-                      alignment: Alignment.centerRight,
-                      child: IconButton(
-                        onPressed: () =>
-                            setState(() => _obscureAll = !_obscureAll),
-                        icon: Icon(
-                          _obscureAll
-                              ? Icons.visibility_outlined
-                              : Icons.visibility_off_outlined,
-                        ),
-                      ),
-                    ),
                     if (_errorText != null) ...[
-                      const SizedBox(height: kSpace8),
+                      const SizedBox(height: kSpace16),
                       StateBadge(
                         variant: BadgeVariant.error,
                         label: _errorText!,
                       ),
                     ],
-                    const SizedBox(height: kSpace16),
+                    const SizedBox(height: kSpace24),
                     FilledButton(
                       onPressed: _submitting ? null : _submit,
                       child: _submitting
@@ -178,7 +213,7 @@ class _PasswordChangePageState extends ConsumerState<PasswordChangePage> {
                               width: 20,
                               child: CircularProgressIndicator(strokeWidth: 2),
                             )
-                          : Text(l10n.passwordChangeTitle),
+                          : Text(l10n.passwordSave),
                     ),
                   ],
                 ),
@@ -189,4 +224,22 @@ class _PasswordChangePageState extends ConsumerState<PasswordChangePage> {
       ),
     );
   }
+
+  /// 显示/隐藏切换（Tooltip 提供语义标签；触控目标 48）。
+  Widget _visibilityToggle({
+    required bool obscure,
+    required VoidCallback onPressed,
+  }) {
+    final l10n = AppLocalizations.of(context);
+    return Tooltip(
+      message: obscure ? l10n.loginShowPassword : l10n.loginHidePassword,
+      child: IconButton(
+        onPressed: onPressed,
+        icon: Icon(
+          obscure ? Icons.visibility_outlined : Icons.visibility_off_outlined,
+          size: 24,
+        ),
+      ),
+    );
+  }
 }
diff --git a/apps/mobile/lib/ui/components/language_sheet.dart b/apps/mobile/lib/ui/components/language_sheet.dart
new file mode 100644
index 0000000..0cfc424
--- /dev/null
+++ b/apps/mobile/lib/ui/components/language_sheet.dart
@@ -0,0 +1,168 @@
+/// 语言选择 BottomSheet（UI-03 页面 04，登录页与设置页复用）。
+///
+/// 带拖柄；「Follow device / English / 中文」各以自身语言书写。临时
+/// 选中（点击仅切换视觉标记）+ **Done 提交**——滑动关闭/点外部取消
+/// 不改动语言偏好；提交后经 [LocaleSettings.setChoice] 统一刷新
+/// （MaterialApp 重建，IndexedStack 页签状态不受影响）。
+///
+/// 选项行为自绘单选圆点（触控行高 ≥48，选中态主色填充），Semantics
+/// 携带选中状态（读屏不依赖颜色）。
+library;
+
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../app/locale_controller.dart';
+import '../../l10n/app_localizations.dart';
+import '../tokens.dart';
+
+/// 打开语言选择面板（唯一入口，两处调用共用同一行为）。
+Future<void> showLanguageSheet(BuildContext context) {
+  return showModalBottomSheet<void>(
+    context: context,
+    showDragHandle: true,
+    builder: (sheetContext) => const LanguageSheet(),
+  );
+}
+
+/// 语言选择面板内容：临时选中 + Done 提交。
+class LanguageSheet extends ConsumerStatefulWidget {
+  const LanguageSheet({super.key});
+
+  @override
+  ConsumerState<LanguageSheet> createState() => _LanguageSheetState();
+}
+
+class _LanguageSheetState extends ConsumerState<LanguageSheet> {
+  /// 临时选中（打开时刻快照；未点 Done 离开即丢弃）。
+  late AppLocaleChoice _selected = ref.read(localeSettingsProvider);
+
+  /// 档位 → 展示名（语言名固定以自身语言书写，不随界面语言变化）。
+  String _labelOf(AppLocalizations l10n, AppLocaleChoice choice) =>
+      switch (choice) {
+        AppLocaleChoice.system => l10n.localeFollowSystem,
+        AppLocaleChoice.zh => l10n.localeChinese,
+        AppLocaleChoice.en => l10n.localeEnglish,
+      };
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context);
+    return SafeArea(
+      top: false,
+      child: Padding(
+        padding: const EdgeInsets.fromLTRB(
+          kSpace16, 0, kSpace16, kSpace16,
+        ),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            for (final choice in AppLocaleChoice.values)
+              _LanguageOptionRow(
+                label: _labelOf(l10n, choice),
+                selected: choice == _selected,
+                onTap: () => setState(() => _selected = choice),
+              ),
+            const SizedBox(height: kSpace16),
+            FilledButton(
+              onPressed: _commit,
+              child: Text(l10n.languageDone),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  /// Done 提交：写入档位后关闭（滑动关闭/取消路径不经过这里）。
+  Future<void> _commit() async {
+    final navigator = Navigator.of(context);
+    await ref
+        .read(localeSettingsProvider.notifier)
+        .setChoice(_selected);
+    navigator.pop();
+  }
+}
+
+/// 单个语言选项行：整行可点（≥48 触控高）+ 自绘单选圆点。
+class _LanguageOptionRow extends StatelessWidget {
+  const _LanguageOptionRow({
+    required this.label,
+    required this.selected,
+    required this.onTap,
+  });
+
+  final String label;
+  final bool selected;
+  final VoidCallback onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    return Semantics(
+      selected: selected,
+      button: true,
+      child: InkWell(
+        onTap: onTap,
+        borderRadius: BorderRadius.circular(kRadiusInput),
+        child: Container(
+          constraints: const BoxConstraints(minHeight: 48),
+          padding: const EdgeInsets.symmetric(vertical: kSpace12),
+          child: Row(
+            children: [
+              Expanded(
+                child: Text(
+                  label,
+                  style: theme.textTheme.bodyLarge?.copyWith(
+                    fontWeight: selected ? FontWeight.w600 : null,
+                    color: selected
+                        ? theme.colorScheme.primary
+                        : theme.colorScheme.onSurface,
+                  ),
+                ),
+              ),
+              const SizedBox(width: kSpace12),
+              _RadioDot(selected: selected),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+/// 自绘单选圆点（20dp）：未选 = 分隔色描边空心，选中 = 主色描边 +
+/// 主色内点；配 [Semantics.selected] 提供非视觉状态。
+class _RadioDot extends StatelessWidget {
+  const _RadioDot({required this.selected});
+
+  final bool selected;
+
+  @override
+  Widget build(BuildContext context) {
+    final scheme = Theme.of(context).colorScheme;
+    final color = selected ? scheme.primary : scheme.outline;
+    return Container(
+      width: 20,
+      height: 20,
+      decoration: BoxDecoration(
+        shape: BoxShape.circle,
+        border: Border.fromBorderSide(
+          BorderSide(color: color, width: 2),
+        ),
+      ),
+      alignment: Alignment.center,
+      child: selected
+          ? Container(
+              width: 10,
+              height: 10,
+              decoration: BoxDecoration(
+                shape: BoxShape.circle,
+                color: scheme.primary,
+              ),
+            )
+          : null,
+    );
+  }
+}
diff --git a/apps/mobile/test/app/theme_test.dart b/apps/mobile/test/app/theme_test.dart
index 7dea6ad..ffe933d 100644
--- a/apps/mobile/test/app/theme_test.dart
+++ b/apps/mobile/test/app/theme_test.dart
@@ -1,9 +1,9 @@
 /// UI-01 主题一致性测试（Task 3）。
 ///
 /// 覆盖：浅色 ColorScheme 方案 §3.1 精确值、深色语义对应值、字阶
-/// （22/17/16-14/13-12）、组件主题（按钮高 48/圆角 12、输入圆角 12、
-/// Dialog 圆角 16、BottomSheet 顶部圆角 16、AppBar titleLarge）、动效
-/// 令牌（含「减少动态效果」归零）。
+/// （UI-03 §3 校准：24/17/16-14/13-12）、组件主题（按钮高 48/圆角 12、
+/// 输入圆角 12、Dialog 圆角 16、BottomSheet 顶部圆角 16、AppBar
+/// titleLarge）、动效令牌（含「减少动态效果」归零）。
 library;
 
 import 'package:flutter/material.dart';
@@ -57,8 +57,8 @@ void main() {
   group('字阶（随系统缩放：fontSize 走 TextScaler）', () {
     final textTheme = AppTheme.light.textTheme;
 
-    test('22 页面标题 / 17 分组 / 16-14 正文 / 13-12 辅助', () {
-      expect(textTheme.titleLarge!.fontSize, 22);
+    test('24 页面标题 / 17 分组 / 16-14 正文 / 13-12 辅助', () {
+      expect(textTheme.titleLarge!.fontSize, 24);
       expect(textTheme.titleMedium!.fontSize, 17);
       expect(textTheme.bodyLarge!.fontSize, 16);
       expect(textTheme.bodyMedium!.fontSize, 14);
@@ -67,7 +67,7 @@ void main() {
     });
 
     test('AppBar 标题用 titleLarge', () {
-      expect(AppTheme.light.appBarTheme.titleTextStyle!.fontSize, 22);
+      expect(AppTheme.light.appBarTheme.titleTextStyle!.fontSize, 24);
     });
   });
 
diff --git a/apps/mobile/test/pages/account_pages_ui03_test.dart b/apps/mobile/test/pages/account_pages_ui03_test.dart
new file mode 100644
index 0000000..e846429
--- /dev/null
+++ b/apps/mobile/test/pages/account_pages_ui03_test.dart
@@ -0,0 +1,453 @@
+/// UI-03 页面 01-04（登录/设置/修改密码/语言选择）重设计回归。
+///
+/// 覆盖：登录拼贴占位与 l10n 文案、密码显示/隐藏切换、键盘压缩布局、
+/// 登录页右上语言入口复用共享面板；设置账号摘要卡（首字母头像）、分组
+/// 与真实版本号、上传帮助面板、退出确认（有任务/无任务两态）；修改密码
+/// 确认不匹配即时提示（修正新密码即清除）、提交中防重复；语言面板
+/// Done 提交/取消不改（各语言以自身语言书写）。
+library;
+
+import 'dart:async';
+
+import 'package:dio/dio.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:photo_live/app/locale_controller.dart';
+import 'package:photo_live/core/api_client.dart';
+import 'package:photo_live/core/error_codes.dart';
+import 'package:photo_live/core/session_store.dart';
+import 'package:photo_live/features/uploads/task_state.dart';
+import 'package:photo_live/features/uploads/task_store.dart';
+import 'package:photo_live/l10n/app_localizations.dart';
+import 'package:photo_live/pages/home_page.dart';
+import 'package:photo_live/pages/login_page.dart';
+import 'package:photo_live/pages/password_change_page.dart';
+
+import '../helpers/fakes.dart';
+
+void main() {
+  late FakeSessionStore session;
+  late TaskStore taskStore;
+
+  setUp(() {
+    session = FakeSessionStore();
+    taskStore = TaskStore.memory();
+  });
+
+  ApiClient clientOf(FakeAdapter adapter) => ApiClient(
+        sessionStore: session,
+        dio: Dio(BaseOptions(baseUrl: 'http://test.local'))
+          ..httpClientAdapter = adapter,
+      );
+
+  /// 登录页（默认 en；不触网——未提交不发请求）。
+  Future<void> pumpLogin(WidgetTester tester, ApiClient client) async {
+    await tester.pumpWidget(
+      ProviderScope(
+        overrides: [...pageTestOverrides(session: session, client: client)],
+        child: MaterialApp(
+          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          supportedLocales: AppLocalizations.supportedLocales,
+          home: const LoginPage(),
+        ),
+      ),
+    );
+    await tester.pumpAndSettle();
+  }
+
+  /// 主壳设置页签（IndexedStack 三页签同建：相册列表走空页兜底）。
+  Future<ProviderContainer> pumpSettings(
+    WidgetTester tester, {
+    FakeLocaleStore? localeStore,
+    AppLocaleChoice initialLocale = AppLocaleChoice.system,
+  }) async {
+    final adapter = FakeAdapter(
+      (o) => o.path == '/v1/albums'
+          ? (200, cursorPageBody(<Map<String, dynamic>>[]))
+          : throw StateError('unexpected ${o.path}'),
+    );
+    final store = localeStore ?? FakeLocaleStore();
+    await tester.pumpWidget(
+      ProviderScope(
+        overrides: [
+          ...pageTestOverrides(
+            session: session,
+            taskStore: taskStore,
+            client: clientOf(adapter),
+          ),
+          localeSettingsProvider.overrideWith(
+            () => LocaleSettings(initial: initialLocale, store: store),
+          ),
+        ],
+        child: MaterialApp(
+          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          supportedLocales: AppLocalizations.supportedLocales,
+          home: const HomePage(),
+        ),
+      ),
+    );
+    await tester.pumpAndSettle();
+    // 切到设置页签（底部导航第三项；IndexedStack 默认在相册页签）。
+    await tester.tap(find.byIcon(Icons.settings_outlined));
+    await tester.pumpAndSettle();
+    return ProviderScope.containerOf(
+      tester.element(find.byType(HomePage)),
+    );
+  }
+
+  /// 修改密码页（推入命名路由，上级页面带 MARK）。
+  Future<void> pumpPasswordChange(WidgetTester tester, ApiClient client) async {
+    await tester.pumpWidget(
+      ProviderScope(
+        overrides: [apiClientProvider.overrideWith((ref) => client)],
+        child: MaterialApp(
+          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          supportedLocales: AppLocalizations.supportedLocales,
+          home: const Scaffold(body: Center(child: Text('MARK'))),
+          routes: {
+            '/password-change': (context) => const PasswordChangePage(),
+          },
+        ),
+      ),
+    );
+    tester
+        .state<NavigatorState>(find.byType(Navigator).first)
+        .pushNamed('/password-change');
+    await tester.pumpAndSettle();
+  }
+
+  UploadTaskDraft makeDraft(String id) => UploadTaskDraft(
+        id: id,
+        accountId: 'staff01',
+        albumId: 'alb-1',
+        clientTaskId: 'ct-$id',
+        sourceFilePath: '/tmp/$id.jpg',
+        filename: '$id.jpg',
+        bytes: 10,
+        contentType: 'image/jpeg',
+      );
+
+  /// 任务库写通知 → 200ms 防抖后角标计数生效。
+  Future<void> pumpCounts(WidgetTester tester) async {
+    await tester.pump(const Duration(milliseconds: 450));
+  }
+
+  group('页面 01 登录', () {
+    testWidgets('拼贴占位 + 主标题/说明/管理员提示均来自 l10n', (tester) async {
+      await pumpLogin(tester, clientOf(FakeAdapter(
+          (o) => throw StateError('不应发起请求: ${o.path}'))));
+
+      expect(find.byKey(const Key('login-collage')), findsOneWidget,
+          reason: '拼贴渐变占位在场');
+      expect(find.text('Your event. In focus.'), findsOneWidget);
+      expect(
+        find.text('Sign in to manage albums and photos'),
+        findsOneWidget,
+      );
+      expect(find.text('Ask admin for account'), findsOneWidget);
+    });
+
+    testWidgets('密码显示/隐藏切换（Tooltip 语义 + obscureText 翻转）',
+        (tester) async {
+      await pumpLogin(tester, clientOf(FakeAdapter(
+          (o) => throw StateError('不应发起请求: ${o.path}'))));
+
+      TextField passwordField() => tester.widget<TextField>(
+            find.descendant(
+              of: find.widgetWithText(TextFormField, 'Password'),
+              matching: find.byType(TextField),
+            ),
+          );
+      expect(passwordField().obscureText, isTrue);
+      expect(find.byTooltip('Show password'), findsOneWidget);
+
+      await tester.tap(find.byTooltip('Show password'));
+      await tester.pump();
+      expect(passwordField().obscureText, isFalse,
+          reason: '切换后明文可见');
+      expect(find.byTooltip('Hide password'), findsOneWidget);
+
+      await tester.tap(find.byTooltip('Hide password'));
+      await tester.pump();
+      expect(passwordField().obscureText, isTrue);
+    });
+
+    testWidgets('键盘开启 → 拼贴压缩（高度显著缩小，整页可滚动）', (tester) async {
+      await pumpLogin(tester, clientOf(FakeAdapter(
+          (o) => throw StateError('不应发起请求: ${o.path}'))));
+
+      final before = tester.getSize(find.byKey(const Key('login-collage')));
+      tester.view.viewInsets = const FakeViewPadding(bottom: 420);
+      addTearDown(tester.view.resetViewInsets);
+      await tester.pumpAndSettle();
+
+      final after = tester.getSize(find.byKey(const Key('login-collage')));
+      expect(after.height, lessThan(before.height),
+          reason: '键盘开启时拼贴压缩（28% → 10% 档）');
+      expect(find.byKey(const Key('login-collage')), findsOneWidget,
+          reason: '压缩而非移除');
+
+      // 表单仍可达（滚动到密码字段并聚焦）。
+      await tester.ensureVisible(find.text('Password'));
+      expect(find.text('Password'), findsOneWidget);
+    });
+
+    testWidgets('右上语言入口打开共享语言面板', (tester) async {
+      await pumpLogin(tester, clientOf(FakeAdapter(
+          (o) => throw StateError('不应发起请求: ${o.path}'))));
+
+      await tester.tap(find.text('EN'));
+      await tester.pumpAndSettle();
+
+      expect(find.text('Follow system'), findsOneWidget);
+      expect(find.text('Done'), findsOneWidget);
+    });
+
+    testWidgets('失败 → 表单附近内联错误徽章', (tester) async {
+      final adapter = FakeAdapter(
+        (o) => o.path == '/v1/auth/password'
+            ? (401, errorBody(ErrorCodes.authInvalidCredentials))
+            : throw StateError('unexpected ${o.path}'),
+      );
+      await pumpLogin(tester, clientOf(adapter));
+
+      await tester.enterText(
+        find.widgetWithText(TextFormField, 'Account'),
+        'staff01',
+      );
+      await tester.enterText(
+        find.widgetWithText(TextFormField, 'Password'),
+        'pw-123456',
+      );
+      await tester.tap(find.text('Sign in'));
+      await tester.pumpAndSettle();
+
+      expect(find.text('Incorrect account or password'), findsOneWidget);
+    });
+  });
+
+  group('页面 02 设置', () {
+    setUp(() {
+      session.session = Session(
+        token: 'tok-live-1',
+        expiresAt: DateTime.utc(2099, 1, 1),
+        account: 'staff01',
+      );
+    });
+
+    testWidgets('账号摘要卡：首字母头像 + 账号（非编辑入口）', (tester) async {
+      await pumpSettings(tester);
+
+      expect(find.text('staff01'), findsOneWidget);
+      expect(find.text('Currently signed-in account'), findsOneWidget);
+      // 首字母头像占位（staff01 → S）。
+      final avatarText = find.descendant(
+        of: find.byType(CircleAvatar),
+        matching: find.text('S'),
+      );
+      expect(avatarText, findsOneWidget);
+    });
+
+    testWidgets('分组标题在场 + 版本来自 kAppVersion', (tester) async {
+      await pumpSettings(tester);
+
+      expect(find.text('Account'), findsOneWidget);
+      expect(find.text('General'), findsOneWidget);
+      expect(find.text(kAppVersion), findsOneWidget, reason: '真实版本号');
+      expect(find.text('Language'), findsOneWidget);
+      expect(find.text('Change password'), findsOneWidget);
+    });
+
+    testWidgets('上传帮助 → 底部面板展示系统限制说明', (tester) async {
+      await pumpSettings(tester);
+
+      await tester.tap(find.text('Upload help'));
+      await tester.pumpAndSettle();
+
+      expect(find.text('How background uploads work'), findsOneWidget);
+      expect(
+        find.textContaining('system keeps uploads running'),
+        findsOneWidget,
+        reason: '帮助正文说明系统限制，不承诺后台持续',
+      );
+    });
+
+    testWidgets('有进行中任务 → 退出确认明确任务保留', (tester) async {
+      await pumpSettings(tester);
+      final task = await taskStore.create(makeDraft('t-1'));
+      await taskStore.updateState(task.id, UploadTaskState.queued);
+      await pumpCounts(tester);
+
+      await tester.ensureVisible(find.text('Sign out'));
+      await tester.pumpAndSettle();
+      await tester.tap(find.text('Sign out'));
+      await tester.pumpAndSettle();
+
+      expect(
+        find.text(
+          'Local upload tasks are preserved on this device and will '
+          'resume when you sign back in.',
+        ),
+        findsOneWidget,
+      );
+      await tester.tap(find.text('Cancel'));
+      await tester.pumpAndSettle();
+      expect(session.session, isNotNull, reason: '取消不登出');
+    });
+
+    testWidgets('无任务 → 退出确认为常规文案', (tester) async {
+      await pumpSettings(tester);
+
+      await tester.ensureVisible(find.text('Sign out'));
+      await tester.pumpAndSettle();
+      await tester.tap(find.text('Sign out'));
+      await tester.pumpAndSettle();
+
+      expect(
+        find.text('You will be signed out on this device.'),
+        findsOneWidget,
+      );
+    });
+  });
+
+  group('页面 03 修改密码', () {
+    setUp(() {
+      session.session = Session(
+        token: 'tok-live-1',
+        expiresAt: DateTime.utc(2099, 1, 1),
+        account: 'staff01',
+      );
+    });
+
+    testWidgets('确认不匹配即时提示；修正新密码即清除', (tester) async {
+      await pumpPasswordChange(
+        tester,
+        clientOf(FakeAdapter((o) => throw StateError('不应发起请求'))),
+      );
+
+      await tester.enterText(
+        find.widgetWithText(TextFormField, 'New password'),
+        'brand-new-pass-9',
+      );
+      await tester.enterText(
+        find.widgetWithText(TextFormField, 'Confirm new password'),
+        'different-pass-9',
+      );
+      await tester.pump();
+
+      expect(find.text('New passwords do not match'), findsOneWidget,
+          reason: '输入即校验，不等提交');
+
+      // 修正新密码（与确认一致）→ 监听器复验清除错误。
+      await tester.enterText(
+        find.widgetWithText(TextFormField, 'New password'),
+        'different-pass-9',
+      );
+      await tester.pump();
+      expect(find.text('New passwords do not match'), findsNothing);
+    });
+
+    testWidgets('提交中按钮禁用（防重复提交）', (tester) async {
+      final gate = Completer<void>();
+      final adapter = FakeAdapter((o) async {
+        await gate.future;
+        return (204, null);
+      });
+      await pumpPasswordChange(tester, clientOf(adapter));
+
+      await tester.enterText(
+        find.widgetWithText(TextFormField, 'Current password'),
+        'old-pass-123',
+      );
+      await tester.enterText(
+        find.widgetWithText(TextFormField, 'New password'),
+        'brand-new-pass-9',
+      );
+      await tester.enterText(
+        find.widgetWithText(TextFormField, 'Confirm new password'),
+        'brand-new-pass-9',
+      );
+      await tester.tap(find.widgetWithText(FilledButton, 'Save password'));
+      await tester.pump(const Duration(milliseconds: 50));
+
+      expect(find.byType(CircularProgressIndicator), findsOneWidget);
+      await tester.tap(
+        find.byType(FilledButton),
+        warnIfMissed: false,
+      );
+      await tester.pump(const Duration(milliseconds: 50));
+      expect(adapter.requests, hasLength(1), reason: '加载中不重复提交');
+
+      gate.complete();
+      await tester.pumpAndSettle();
+      expect(find.text('MARK'), findsOneWidget, reason: '成功后 pop 回上级');
+    });
+  });
+
+  group('页面 04 语言选择（共享面板）', () {
+    setUp(() {
+      session.session = Session(
+        token: 'tok-live-1',
+        expiresAt: DateTime.utc(2099, 1, 1),
+        account: 'staff01',
+      );
+    });
+
+    testWidgets('各语言以自身语言书写 + Done 提交（持久化 + 即刻刷新）',
+        (tester) async {
+      final store = FakeLocaleStore();
+      final container = await pumpSettings(
+        tester,
+        localeStore: store,
+        initialLocale: AppLocaleChoice.system,
+      );
+
+      await tester.tap(find.text('Language'));
+      await tester.pumpAndSettle();
+
+      // 各语言以自身语言书写（不随当前界面语言变化）。
+      // 「Follow system」两次：语言行尾当前值 + 弹层选项。
+      expect(find.text('Follow system'), findsNWidgets(2));
+      expect(find.text('English'), findsOneWidget);
+      expect(find.text('中文'), findsOneWidget);
+
+      await tester.tap(find.text('中文'));
+      await tester.pump();
+      expect(store.writes, isEmpty, reason: 'Done 前不写持久层');
+      await tester.tap(find.text('Done'));
+      await tester.pumpAndSettle();
+
+      expect(container.read(localeSettingsProvider), AppLocaleChoice.zh);
+      expect(store.writes, ['zh'], reason: 'Done 才写持久层');
+      // 本 harness 的 MaterialApp 不随 provider 重接 locale（live 全 App
+      // 重建在 app/locale_test.dart 覆盖）；此处断言行尾当前值更新。
+      expect(find.text('中文'), findsOneWidget, reason: '语言行尾更新为中文');
+      expect(find.byType(IndexedStack), findsOneWidget,
+          reason: '语言刷新不重建页签结构');
+    });
+
+    testWidgets('取消（外部点击关闭）不改变语言偏好', (tester) async {
+      final store = FakeLocaleStore();
+      final container = await pumpSettings(
+        tester,
+        localeStore: store,
+        initialLocale: AppLocaleChoice.system,
+      );
+
+      await tester.tap(find.text('Language'));
+      await tester.pumpAndSettle();
+      await tester.tap(find.text('English'));
+      await tester.pump();
+
+      // 点击面板外（屏障）关闭 = 取消。
+      await tester.tapAt(const Offset(20, 20));
+      await tester.pumpAndSettle();
+
+      expect(container.read(localeSettingsProvider), AppLocaleChoice.system,
+          reason: '未提交不改档位');
+      expect(store.writes, isEmpty, reason: '取消不写持久层');
+      expect(find.text('设置'), findsNothing, reason: '界面保持英文');
+    });
+  });
+}
diff --git a/apps/mobile/test/pages/password_change_page_test.dart b/apps/mobile/test/pages/password_change_page_test.dart
index c9643bc..a99a400 100644
--- a/apps/mobile/test/pages/password_change_page_test.dart
+++ b/apps/mobile/test/pages/password_change_page_test.dart
@@ -86,7 +86,7 @@ void main() {
     await pumpOverMarker(tester, clientOf(adapter));
 
     await fill(tester, newPw: 'short7', confirmPw: 'short7');
-    await tester.tap(find.widgetWithText(FilledButton, 'Change password'));
+    await tester.tap(find.widgetWithText(FilledButton, 'Save password'));
     await tester.pump();
 
     expect(
@@ -102,7 +102,7 @@ void main() {
     await pumpOverMarker(tester, clientOf(adapter));
 
     await fill(tester, confirmPw: 'different-pass-9');
-    await tester.tap(find.widgetWithText(FilledButton, 'Change password'));
+    await tester.tap(find.widgetWithText(FilledButton, 'Save password'));
     await tester.pump();
 
     expect(
@@ -122,7 +122,7 @@ void main() {
     await pumpOverMarker(tester, clientOf(adapter));
 
     await fill(tester);
-    await tester.tap(find.widgetWithText(FilledButton, 'Change password'));
+    await tester.tap(find.widgetWithText(FilledButton, 'Save password'));
     await tester.pumpAndSettle();
 
     expect(find.text('Current password is incorrect'), findsOneWidget);
@@ -141,7 +141,7 @@ void main() {
     await pumpOverMarker(tester, clientOf(adapter));
 
     await fill(tester);
-    await tester.tap(find.widgetWithText(FilledButton, 'Change password'));
+    await tester.tap(find.widgetWithText(FilledButton, 'Save password'));
     await tester.pumpAndSettle();
 
     final req = adapter.requests.single;
diff --git a/apps/mobile/test/pages/settings_tab_test.dart b/apps/mobile/test/pages/settings_tab_test.dart
index 6fb61d3..36af31f 100644
--- a/apps/mobile/test/pages/settings_tab_test.dart
+++ b/apps/mobile/test/pages/settings_tab_test.dart
@@ -1,7 +1,9 @@
-/// 设置页 widget 测试（P3 计划 Task 3）。
+/// 设置页 widget 测试（P3 Task 3；UI-03 页面 02 重设计后更新）。
 ///
-/// 覆盖：修改密码入口跳 /password-change；退出登录 → 调 api.logout
-/// （尽力而为）→ 清空本地会话 → 清栈回 /login。
+/// 覆盖：修改密码入口跳 /password-change；退出登录（有进行中任务 →
+/// 确认弹窗任务保留说明）→ 调 api.logout（尽力而为）→ 清空本地会话 →
+/// 清栈回 /login；账号摘要卡 + 通用分组 + 上传帮助面板 + 版本；
+/// 语言行打开共享面板 Done 提交。
 library;
 
 import 'package:dio/dio.dart';
@@ -11,6 +13,8 @@ import 'package:flutter_test/flutter_test.dart';
 import 'package:photo_live/app/locale_controller.dart';
 import 'package:photo_live/core/api_client.dart';
 import 'package:photo_live/core/session_store.dart';
+import 'package:photo_live/features/uploads/task_state.dart';
+import 'package:photo_live/features/uploads/task_store.dart';
 import 'package:photo_live/l10n/app_localizations.dart';
 import 'package:photo_live/pages/home_page.dart';
 import 'package:photo_live/pages/login_page.dart';
@@ -39,6 +43,7 @@ void main() {
   Future<void> pumpHome(
     WidgetTester tester,
     ApiClient client, {
+    TaskStore? taskStore,
     List<dynamic> extraOverrides = const <dynamic>[],
   }) async {
     await tester.pumpWidget(
@@ -46,7 +51,11 @@ void main() {
         // Task 9 起主壳含队列页（触达 sessionAccountProvider/TaskStore），
         // 真实平台通道在测试环境挂起，必须注入替身。
         overrides: [
-          ...pageTestOverrides(session: store, client: client),
+          ...pageTestOverrides(
+            session: store,
+            taskStore: taskStore,
+            client: client,
+          ),
           ...extraOverrides,
         ],
         child: MaterialApp(
@@ -85,9 +94,26 @@ void main() {
       if (o.path == '/v1/albums') return (500, errorBody('INTERNAL_ERROR'));
       throw StateError('unexpected ${o.path}');
     });
-    await pumpHome(tester, clientOf(adapter));
+    // 一个排队中任务：退出确认走「任务保留」文案（UI-03 有任务分支）。
+    final taskStore = TaskStore.memory();
+    final task = await taskStore.create(UploadTaskDraft(
+      id: 't-1',
+      accountId: 'staff01',
+      albumId: 'alb-1',
+      clientTaskId: 'ct-t-1',
+      sourceFilePath: '/tmp/t-1.jpg',
+      filename: 't-1.jpg',
+      bytes: 10,
+      contentType: 'image/jpeg',
+    ));
+    await taskStore.updateState(task.id, UploadTaskState.queued);
+    await pumpHome(tester, clientOf(adapter), taskStore: taskStore);
+    // 等任务计数防抖载入（未结束任务 → 退出确认带保留说明）。
+    await tester.pump(const Duration(milliseconds: 450));
 
-    // 点列表项 → 先弹确认（§4.5：明确本机任务保留，不承诺后台继续）。
+    // 点列表项 → 先弹确认（明确本机任务保留，不承诺后台继续）。
+    await tester.ensureVisible(find.text('Sign out'));
+    await tester.pumpAndSettle();
     await tester.tap(find.text('Sign out'));
     await tester.pumpAndSettle();
     expect(find.text('Sign out?'), findsOneWidget);
@@ -116,46 +142,44 @@ void main() {
     expect(find.byType(HomePage), findsNothing, reason: '主壳已出栈');
   });
 
-  testWidgets('设置分组：账号/语言/安全/上传帮助/关于（UI-01 §4.5）',
+  testWidgets('账号摘要卡 + 通用分组 + 上传帮助面板 + 版本（UI-03 页面 02）',
       (tester) async {
     final adapter = FakeAdapter((_) => throw StateError('不应发起请求'));
-    // 分组列表长于默认 800×600 视口（「关于」在折叠线下不可建树）。
-    tester.view.physicalSize = const Size(800, 1600);
-    tester.view.devicePixelRatio = 1;
-    addTearDown(tester.view.reset);
     await pumpHome(tester, clientOf(adapter));
 
-    // 五个分组标题（SectionHeader 文案）。
-    for (final section in [
-      'Account',
-      'Language',
-      'Security',
-      'Upload help',
-      'About',
-    ]) {
+    // 两个分组标题（SectionHeader 文案）。
+    for (final section in ['Account', 'General']) {
       expect(find.text(section), findsOneWidget, reason: '分组「$section」');
     }
 
-    // 账号分组：当前账号 + 说明副标题。
+    // 账号摘要卡：当前账号 + 说明副标题（非编辑入口）。
     expect(find.text('staff01'), findsOneWidget);
     expect(find.text('Currently signed-in account'), findsOneWidget);
+    expect(find.descendant(
+      of: find.byType(CircleAvatar),
+      matching: find.text('S'),
+    ), findsOneWidget, reason: '首字母头像占位');
 
-    // 上传帮助：展开后说明系统限制 / 强退 / 网络等待三分态（不承诺
+    // 通用分组四行。
+    expect(find.text('Language'), findsOneWidget);
+    expect(find.text('Change password'), findsOneWidget);
+    expect(find.text('Upload help'), findsOneWidget);
+    expect(find.text('Version'), findsOneWidget);
+    expect(find.text(kAppVersion), findsOneWidget);
+
+    // 上传帮助：底部面板说明系统限制 / 强退 / 网络等待（不承诺
     // 「后台上传已开启」）。
-    await tester.tap(find.text('How background uploads work'));
+    await tester.tap(find.text('Upload help'));
     await tester.pumpAndSettle();
+    expect(find.text('How background uploads work'), findsOneWidget);
     expect(find.textContaining('battery limits'), findsOneWidget);
     expect(
       find.textContaining('start automatically once a connection is available'),
       findsOneWidget,
     );
-
-    // 关于分组：版本 tile。
-    expect(find.text('Version'), findsOneWidget);
-    expect(find.text(kAppVersion), findsOneWidget);
   });
 
-  testWidgets('语言切换：底部弹层三选一 → 更新档位 + 持久化（P3 Task 10）',
+  testWidgets('语言切换：共享面板临时选中 + Done 提交 → 更新档位 + 持久化',
       (tester) async {
     final adapter = FakeAdapter((_) => throw StateError('不应发起请求'));
     final localeStore = FakeLocaleStore();
@@ -171,23 +195,32 @@ void main() {
 
     // 本 harness 的 MaterialApp 固定 en（live 全 App 重建在
     // app/locale_test.dart 的 PhotoLiveApp 用例覆盖）。
-    expect(find.text('Language'), findsOneWidget, reason: '语言分组标题');
-    expect(find.text('Follow system'), findsOneWidget, reason: '默认档位行标题');
+    expect(find.text('Language'), findsOneWidget, reason: '语言行标题');
+    expect(
+      find.text('Follow system'),
+      findsOneWidget,
+      reason: '默认档位（行尾当前值）',
+    );
 
-    // 行标题即当前档位，点它打开弹层。
-    await tester.tap(find.text('Follow system'));
+    // 点语言行打开共享弹层。
+    await tester.tap(find.text('Language'));
     await tester.pumpAndSettle();
 
     // 弹层三选项（语言名以自身语言书写，跨 locale 不变）。
-    // 「Follow system」出现两次：主档行标题 + 弹层选项。
+    // 「Follow system」出现两次：语言行尾当前值 + 弹层选项。
     expect(find.text('Follow system'), findsNWidgets(2));
     expect(find.text('中文'), findsOneWidget);
     expect(find.text('English'), findsOneWidget);
+    expect(find.text('Done'), findsOneWidget);
 
+    // 临时选中 + Done 提交（未 Done 前不落档位）。
     await tester.tap(find.text('中文'));
+    await tester.pump();
+    expect(localeStore.writes, isEmpty, reason: 'Done 前不写持久层');
+    await tester.tap(find.text('Done'));
     await tester.pumpAndSettle();
 
-    expect(find.text('中文'), findsOneWidget, reason: '行标题更新为当前档位');
+    expect(find.text('中文'), findsOneWidget, reason: '行尾更新为当前档位');
     expect(localeStore.writes, ['zh'], reason: '选择写入 app.locale');
   });
 }