diff --git a/app.json b/app.json
index f04fe52..9e69d98 100644
--- a/app.json
+++ b/app.json
@@ -2,7 +2,7 @@
   "expo": {
     "name": "萝卜社区",
     "slug": "qojo",
-    "version": "1.0.12",
+    "version": "1.0.13",
     "orientation": "default",
     "icon": "./assets/icon.png",
     "userInterfaceStyle": "automatic",
@@ -36,7 +36,7 @@
       },
       "predictiveBackGestureEnabled": false,
       "package": "skin.carrot.bbs",
-      "versionCode": 6,
+      "versionCode": 7,
       "permissions": [
         "VIBRATE",
         "RECORD_AUDIO",
@@ -63,6 +63,16 @@
     },
     "plugins": [
       "./plugins/withMainActivityConfigChange",
+      [
+        "./plugins/withForegroundService",
+        {
+          "notificationTitle": "萝卜社区",
+          "notificationBody": "正在后台同步消息",
+          "notificationIcon": "ic_notification",
+          "channelId": "carrot_sync_foreground",
+          "channelName": "消息同步"
+        }
+      ],
       [
         "expo-router",
         {
@@ -86,9 +96,9 @@
         }
       ],
       [
-        "expo-background-fetch",
+        "expo-background-task",
         {
-          "minimumInterval": 900
+          "minimumInterval": 15
         }
       ],
       [
diff --git a/package.json b/package.json
index 62dacb5..b021805 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "carrot_bbs",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "main": "expo-router/entry",
   "scripts": {
     "start": "expo start",
@@ -25,7 +25,6 @@
     "axios": "^1.13.6",
     "date-fns": "^4.1.0",
     "expo": "~55.0.4",
-    "expo-background-fetch": "~55.0.10",
     "expo-background-task": "~55.0.10",
     "expo-camera": "^55.0.10",
     "expo-constants": "~55.0.7",
diff --git a/plugins/withForegroundService.js b/plugins/withForegroundService.js
new file mode 100644
index 0000000..bb8badb
--- /dev/null
+++ b/plugins/withForegroundService.js
@@ -0,0 +1,467 @@
+const { withAndroidManifest, withDangerousMod } = require('@expo/config-plugins');
+const fs = require('fs');
+const path = require('path');
+
+const FOREGROUND_SERVICE_PERMISSION = 'android.permission.FOREGROUND_SERVICE';
+const FOREGROUND_SERVICE_DATA_SYNC = 'android.permission.FOREGROUND_SERVICE_DATA_SYNC';
+
+/**
+ * Expo Config Plugin：为 Android 添加前台服务保活
+ * 
+ * 功能：
+ * 1. 添加 FOREGROUND_SERVICE 相关权限
+ * 2. 在 AndroidManifest 中声明 Service
+ * 3. 生成 Kotlin 原生服务代码
+ * 4. 生成 React Native Bridge 模块
+ * 
+ * 参考：Element Android 的 GuardAndroidService
+ */
+const withForegroundService = (config, options = {}) => {
+  const {
+    notificationTitle = '萝卜社区',
+    notificationBody = '正在后台同步消息',
+    notificationIcon = 'ic_notification',
+    channelId = 'carrot_sync_foreground',
+    channelName = '消息同步',
+  } = options;
+
+  // 1. 添加权限和 Service 声明到 AndroidManifest
+  config = withAndroidManifest(config, (config) => {
+    const manifest = config.modResults;
+    
+    // 添加权限声明
+    const permissions = [
+      FOREGROUND_SERVICE_PERMISSION,
+      FOREGROUND_SERVICE_DATA_SYNC,
+    ];
+    
+    permissions.forEach((permission) => {
+      const existingPermission = manifest.manifest['uses-permission']?.find(
+        (p) => p.$['android:name'] === permission
+      );
+      if (!existingPermission) {
+        if (!manifest.manifest['uses-permission']) {
+          manifest.manifest['uses-permission'] = [];
+        }
+        manifest.manifest['uses-permission'].push({
+          $: { 'android:name': permission },
+        });
+      }
+    });
+
+    // 添加 Service 声明
+    if (!manifest.manifest.application[0].service) {
+      manifest.manifest.application[0].service = [];
+    }
+    
+    const existingService = manifest.manifest.application[0].service.find(
+      (s) => s.$['android:name'] === '.SyncForegroundService'
+    );
+    
+    if (!existingService) {
+      manifest.manifest.application[0].service.push({
+        $: {
+          'android:name': '.SyncForegroundService',
+          'android:enabled': 'true',
+          'android:exported': 'false',
+          'android:foregroundServiceType': 'dataSync',
+        },
+      });
+    }
+
+    return config;
+  });
+
+  // 2. 生成 Kotlin 原生代码
+  config = withDangerousMod(config, [
+    'android',
+    async (config) => {
+      const projectRoot = config.modRequest.projectRoot;
+      const packageName = config.android.package;
+      const kotlinPath = path.join(
+        projectRoot,
+        'android/app/src/main/java',
+        packageName.replace(/\./g, '/')
+      );
+
+      // 确保目录存在
+      if (!fs.existsSync(kotlinPath)) {
+        fs.mkdirSync(kotlinPath, { recursive: true });
+      }
+
+      // 生成 SyncForegroundService.kt
+      const serviceCode = generateServiceCode(packageName, {
+        notificationTitle,
+        notificationBody,
+        notificationIcon,
+        channelId,
+        channelName,
+      });
+      
+      fs.writeFileSync(
+        path.join(kotlinPath, 'SyncForegroundService.kt'),
+        serviceCode
+      );
+
+      // 生成 ForegroundServiceModule.kt (React Native Bridge)
+      const moduleCode = generateModuleCode(packageName);
+      fs.writeFileSync(
+        path.join(kotlinPath, 'ForegroundServiceModule.kt'),
+        moduleCode
+      );
+
+      // 生成 ForegroundServicePackage.kt
+      const packageCode = generatePackageCode(packageName);
+      fs.writeFileSync(
+        path.join(kotlinPath, 'ForegroundServicePackage.kt'),
+        packageCode
+      );
+
+      // 修改 MainApplication.kt 注册模块
+      const mainAppPath = path.join(kotlinPath, 'MainApplication.kt');
+      if (fs.existsSync(mainAppPath)) {
+        let content = fs.readFileSync(mainAppPath, 'utf-8');
+        
+        // 添加 import
+        if (!content.includes('ForegroundServicePackage')) {
+          content = content.replace(
+            /package .*\n/,
+            `$&\nimport ${packageName}.ForegroundServicePackage\n`
+          );
+        }
+        
+        // 在 packages 列表中添加
+        if (!content.includes('ForegroundServicePackage()')) {
+          // 查找 PackageList(this).packages.apply 块
+          content = content.replace(
+            /(PackageList\(this\)\.packages\.apply\s*\{)/,
+            `$1\n          // 前台服务模块\n          add(ForegroundServicePackage())`
+          );
+        }
+        
+        fs.writeFileSync(mainAppPath, content);
+      }
+
+      // 创建通知图标目录和文件
+      const drawablePath = path.join(projectRoot, 'android/app/src/main/res/drawable');
+      if (!fs.existsSync(drawablePath)) {
+        fs.mkdirSync(drawablePath, { recursive: true });
+      }
+      
+      const iconPath = path.join(drawablePath, 'ic_notification.xml');
+      if (!fs.existsSync(iconPath)) {
+        fs.writeFileSync(iconPath, generateNotificationIcon());
+      }
+
+      return config;
+    },
+  ]);
+
+  return config;
+};
+
+/**
+ * 生成前台服务 Kotlin 代码
+ */
+function generateServiceCode(packageName, options) {
+  const { notificationTitle, notificationBody, notificationIcon, channelId, channelName } = options;
+  
+  return `package ${packageName}
+
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.app.Service
+import android.content.Context
+import android.content.Intent
+import android.content.pm.ServiceInfo
+import android.os.Build
+import android.os.IBinder
+import androidx.core.app.NotificationCompat
+import androidx.core.content.ContextCompat
+
+/**
+ * 前台同步服务
+ * 
+ * 在通知栏显示常驻通知，防止应用进程被系统杀死
+ * 类似 Element Android 的 GuardAndroidService 和 V2Ray 的保活机制
+ */
+class SyncForegroundService : Service() {
+
+    companion object {
+        const val NOTIFICATION_ID = 1001
+        const val CHANNEL_ID = "${channelId}"
+        const val CHANNEL_NAME = "${channelName}"
+        
+        const val ACTION_START = "${packageName}.foreground.START"
+        const val ACTION_STOP = "${packageName}.foreground.STOP"
+        const val ACTION_UPDATE = "${packageName}.foreground.UPDATE"
+        
+        const val EXTRA_TITLE = "title"
+        const val EXTRA_BODY = "body"
+
+        /**
+         * 启动前台服务
+         */
+        fun start(context: Context, title: String = "${notificationTitle}", body: String = "${notificationBody}") {
+            val intent = Intent(context, SyncForegroundService::class.java).apply {
+                action = ACTION_START
+                putExtra(EXTRA_TITLE, title)
+                putExtra(EXTRA_BODY, body)
+            }
+            try {
+                ContextCompat.startForegroundService(context, intent)
+            } catch (e: Exception) {
+                android.util.Log.e("SyncForegroundService", "启动前台服务失败", e)
+            }
+        }
+
+        /**
+         * 停止前台服务
+         */
+        fun stop(context: Context) {
+            val intent = Intent(context, SyncForegroundService::class.java).apply {
+                action = ACTION_STOP
+            }
+            context.startService(intent)
+        }
+
+        /**
+         * 更新通知内容
+         */
+        fun update(context: Context, title: String, body: String) {
+            val intent = Intent(context, SyncForegroundService::class.java).apply {
+                action = ACTION_UPDATE
+                putExtra(EXTRA_TITLE, title)
+                putExtra(EXTRA_BODY, body)
+            }
+            context.startService(intent)
+        }
+    }
+
+    private var notificationTitle: String = "${notificationTitle}"
+    private var notificationBody: String = "${notificationBody}"
+
+    override fun onCreate() {
+        super.onCreate()
+        createNotificationChannel()
+    }
+
+    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
+        when (intent?.action) {
+            ACTION_START -> {
+                notificationTitle = intent.getStringExtra(EXTRA_TITLE) ?: "${notificationTitle}"
+                notificationBody = intent.getStringExtra(EXTRA_BODY) ?: "${notificationBody}"
+                startForegroundCompat()
+            }
+            ACTION_STOP -> {
+                stopForegroundCompat()
+                stopSelf()
+            }
+            ACTION_UPDATE -> {
+                notificationTitle = intent.getStringExtra(EXTRA_TITLE) ?: notificationTitle
+                notificationBody = intent.getStringExtra(EXTRA_BODY) ?: notificationBody
+                updateNotification()
+            }
+        }
+        // START_STICKY: 服务被杀后自动重启
+        return START_STICKY
+    }
+
+    override fun onBind(intent: Intent?): IBinder? = null
+
+    /**
+     * 启动前台服务（兼容 Android Q+）
+     */
+    private fun startForegroundCompat() {
+        val notification = buildNotification()
+        
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            startForeground(
+                NOTIFICATION_ID,
+                notification,
+                ServiceInfo.FOREGROUND_SERVICE_TYPE_DATA_SYNC
+            )
+        } else {
+            startForeground(NOTIFICATION_ID, notification)
+        }
+    }
+
+    /**
+     * 停止前台服务（兼容 Android N+）
+     */
+    private fun stopForegroundCompat() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            stopForeground(STOP_FOREGROUND_REMOVE)
+        } else {
+            @Suppress("DEPRECATION")
+            stopForeground(true)
+        }
+    }
+
+    /**
+     * 创建通知渠道
+     */
+    private fun createNotificationChannel() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val channel = NotificationChannel(
+                CHANNEL_ID,
+                CHANNEL_NAME,
+                NotificationManager.IMPORTANCE_MIN  // 最低重要性，不打扰用户
+            ).apply {
+                description = "后台消息同步服务"
+                setSound(null, null)
+                setShowBadge(false)
+                enableLights(false)
+                enableVibration(false)
+            }
+            
+            val manager = getSystemService(NotificationManager::class.java)
+            manager.createNotificationChannel(channel)
+        }
+    }
+
+    /**
+     * 构建通知
+     */
+    private fun buildNotification(): Notification {
+        // 点击通知打开应用
+        val launchIntent = packageManager.getLaunchIntentForPackage(packageName)
+        val pendingIntent = PendingIntent.getActivity(
+            this,
+            0,
+            launchIntent,
+            PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+        )
+
+        return NotificationCompat.Builder(this, CHANNEL_ID)
+            .setContentTitle(notificationTitle)
+            .setContentText(notificationBody)
+            .setSmallIcon(R.drawable.${notificationIcon})
+            .setCategory(NotificationCompat.CATEGORY_SERVICE)
+            .setPriority(NotificationCompat.PRIORITY_MIN)
+            .setOngoing(true)  // 不可滑动清除
+            .setShowWhen(false)
+            .setContentIntent(pendingIntent)
+            .build()
+    }
+
+    /**
+     * 更新通知内容
+     */
+    private fun updateNotification() {
+        val manager = getSystemService(NotificationManager::class.java)
+        manager.notify(NOTIFICATION_ID, buildNotification())
+    }
+}
+`;
+}
+
+/**
+ * 生成 React Native Bridge 模块代码
+ */
+function generateModuleCode(packageName) {
+  return `package ${packageName}
+
+import android.content.Context
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.bridge.ReactContextBaseJavaModule
+import com.facebook.react.bridge.ReactMethod
+import com.facebook.react.bridge.Promise
+
+/**
+ * React Native Bridge: 前台服务控制模块
+ */
+class ForegroundServiceModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) {
+
+    override fun getName(): String = "ForegroundService"
+
+    /**
+     * 启动前台服务
+     */
+    @ReactMethod
+    fun start(title: String, body: String, promise: Promise) {
+        try {
+            SyncForegroundService.start(reactApplicationContext, title, body)
+            promise.resolve(true)
+        } catch (e: Exception) {
+            promise.reject("FOREGROUND_SERVICE_ERROR", e.message)
+        }
+    }
+
+    /**
+     * 停止前台服务
+     */
+    @ReactMethod
+    fun stop(promise: Promise) {
+        try {
+            SyncForegroundService.stop(reactApplicationContext)
+            promise.resolve(true)
+        } catch (e: Exception) {
+            promise.reject("FOREGROUND_SERVICE_ERROR", e.message)
+        }
+    }
+
+    /**
+     * 更新通知内容
+     */
+    @ReactMethod
+    fun update(title: String, body: String, promise: Promise) {
+        try {
+            SyncForegroundService.update(reactApplicationContext, title, body)
+            promise.resolve(true)
+        } catch (e: Exception) {
+            promise.reject("FOREGROUND_SERVICE_ERROR", e.message)
+        }
+    }
+}
+`;
+}
+
+/**
+ * 生成 React Native Package 代码
+ */
+function generatePackageCode(packageName) {
+  return `package ${packageName}
+
+import com.facebook.react.ReactPackage
+import com.facebook.react.bridge.NativeModule
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.uimanager.ViewManager
+
+class ForegroundServicePackage : ReactPackage {
+    override fun createNativeModules(reactContext: ReactApplicationContext): List<NativeModule> {
+        return listOf(ForegroundServiceModule(reactContext))
+    }
+
+    override fun createViewManagers(reactContext: ReactApplicationContext): List<ViewManager<*, *>> {
+        return emptyList()
+    }
+}
+`;
+}
+
+/**
+ * 生成通知图标 XML
+ */
+function generateNotificationIcon() {
+  return `<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <!-- 背景圆 -->
+    <path
+        android:fillColor="#4CAF50"
+        android:pathData="M12,2C6.48,2 2,6.48 2,12s4.48,10 10,10 10,-4.48 10,-10S17.52,2 12,2z"/>
+    <!-- 对勾符号 -->
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M10,17l-5,-5 1.41,-1.41L10,14.17l7.59,-7.59L19,8l-9,9z"/>
+</vector>
+`;
+}
+
+module.exports = withForegroundService;
\ No newline at end of file
diff --git a/src/components/business/SystemMessageItem.tsx b/src/components/business/SystemMessageItem.tsx
index b722eb7..094d4af 100644
--- a/src/components/business/SystemMessageItem.tsx
+++ b/src/components/business/SystemMessageItem.tsx
@@ -125,12 +125,12 @@ function createSystemMessageStyles(colors: AppColors) {
       flexDirection: 'row',
       alignItems: 'flex-start',
       padding: 16,
-      backgroundColor: '#fff',
+      backgroundColor: colors.background.paper,
       borderBottomWidth: 1,
       borderBottomColor: colors.divider || '#E5E5EA',
     },
     unreadContainer: {
-      backgroundColor: '#FFF8F6',
+      backgroundColor: colors.primary.main + '0A',
     },
     unreadIndicator: {
       position: 'absolute',
@@ -140,7 +140,7 @@ function createSystemMessageStyles(colors: AppColors) {
       width: 8,
       height: 8,
       borderRadius: 4,
-      backgroundColor: '#FF6B35',
+      backgroundColor: colors.primary.main,
     },
     iconContainer: {
       marginRight: 14,
@@ -165,7 +165,7 @@ function createSystemMessageStyles(colors: AppColors) {
       justifyContent: 'center',
       alignItems: 'center',
       borderWidth: 2,
-      borderColor: '#fff',
+      borderColor: colors.background.paper,
     },
     content: {
       flex: 1,
@@ -220,7 +220,7 @@ function createSystemMessageStyles(colors: AppColors) {
       flexDirection: 'row',
       alignItems: 'center',
       marginTop: 8,
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       paddingHorizontal: 10,
       paddingVertical: 6,
       borderRadius: 8,
@@ -318,13 +318,6 @@ const getSystemMessageTitle = (message: SystemMessageResponse): string => {
   }
 };
 
-// 胡萝卜橙主题色
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 const SystemMessageItem: React.FC<SystemMessageItemProps> = ({
   message,
   onPress,
diff --git a/src/screens/auth/ForgotPasswordScreen.tsx b/src/screens/auth/ForgotPasswordScreen.tsx
index dafa722..3be3711 100644
--- a/src/screens/auth/ForgotPasswordScreen.tsx
+++ b/src/screens/auth/ForgotPasswordScreen.tsx
@@ -26,19 +26,13 @@ import {
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { useRouter } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
-import { useAppColors, type AppColors } from '../../theme';
+import { useAppColors, useResolvedColorScheme, type AppColors } from '../../theme';
 import { authService, resolveAuthApiError } from '../../services/authService';
 import { showPrompt } from '../../services/promptService';
 
-// 胡萝卜橙主题色
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 export const ForgotPasswordScreen: React.FC = () => {
   const colors = useAppColors();
+  const resolved = useResolvedColorScheme();
   const styles = useMemo(() => createForgotPasswordStyles(colors), [colors]);
   const router = useRouter();
   
@@ -156,7 +150,7 @@ export const ForgotPasswordScreen: React.FC = () => {
 
   return (
     <SafeAreaView style={styles.container}>
-      <StatusBar barStyle="dark-content" backgroundColor="#fff" />
+      <StatusBar barStyle={resolved === 'dark' ? 'light-content' : 'dark-content'} backgroundColor={colors.background.paper} />
       <KeyboardAvoidingView 
         behavior={Platform.OS === 'ios' ? 'padding' : 'height'} 
         style={styles.keyboardView}
@@ -198,7 +192,7 @@ export const ForgotPasswordScreen: React.FC = () => {
                     keyboardType="email-address"
                   />
                   {email.length > 0 && validateEmail(email) && (
-                    <MaterialCommunityIcons name="check-circle" size={20} color={THEME_COLORS.primary} style={styles.checkIcon} />
+                    <MaterialCommunityIcons name="check-circle" size={20} color={colors.primary.main} style={styles.checkIcon} />
                   )}
                 </View>
               </View>
@@ -225,7 +219,7 @@ export const ForgotPasswordScreen: React.FC = () => {
                     activeOpacity={0.8}
                   >
                     {sendingCode ? (
-                      <ActivityIndicator size="small" color={THEME_COLORS.primary} />
+                      <ActivityIndicator size="small" color={colors.primary.main} />
                     ) : (
                       <Text style={styles.sendCodeButtonText}>{countdown > 0 ? `${countdown}s` : '获取验证码'}</Text>
                     )}
@@ -295,7 +289,7 @@ export const ForgotPasswordScreen: React.FC = () => {
                 activeOpacity={0.9}
               >
                 {loading ? (
-                  <ActivityIndicator size="small" color="#fff" />
+                  <ActivityIndicator size="small" color={colors.text.inverse} />
                 ) : (
                   <Text style={styles.submitButtonText}>重置密码</Text>
                 )}
@@ -307,7 +301,7 @@ export const ForgotPasswordScreen: React.FC = () => {
                 onPress={() => router.back()}
                 activeOpacity={0.8}
               >
-                <MaterialCommunityIcons name="arrow-left" size={18} color={THEME_COLORS.primary} style={{ marginRight: 4 }} />
+                <MaterialCommunityIcons name="arrow-left" size={18} color={colors.primary.main} style={{ marginRight: 4 }} />
                 <Text style={styles.backButtonText}>返回登录</Text>
               </TouchableOpacity>
             </View>
@@ -322,7 +316,7 @@ function createForgotPasswordStyles(colors: AppColors) {
   return StyleSheet.create({
     container: {
       flex: 1,
-      backgroundColor: '#fff',
+      backgroundColor: colors.background.paper,
     },
     keyboardView: {
       flex: 1,
@@ -354,7 +348,7 @@ function createForgotPasswordStyles(colors: AppColors) {
     underline: {
       width: 40,
       height: 4,
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
       borderRadius: 2,
       marginTop: 12,
       marginBottom: 16,
@@ -382,7 +376,7 @@ function createForgotPasswordStyles(colors: AppColors) {
     inputWrapper: {
       flexDirection: 'row',
       alignItems: 'center',
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderRadius: 14,
       paddingHorizontal: 18,
       height: 56,
@@ -412,7 +406,7 @@ function createForgotPasswordStyles(colors: AppColors) {
     sendCodeButton: {
       height: 56,
       paddingHorizontal: 16,
-      backgroundColor: 'rgba(255, 107, 53, 0.1)',
+      backgroundColor: colors.primary.light + '20',
       borderRadius: 14,
       alignItems: 'center',
       justifyContent: 'center',
@@ -424,14 +418,14 @@ function createForgotPasswordStyles(colors: AppColors) {
     sendCodeButtonText: {
       fontSize: 14,
       fontWeight: '600',
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
     },
 
     // 提交按钮
     submitButton: {
       height: 56,
       borderRadius: 14,
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
       alignItems: 'center',
       justifyContent: 'center',
       marginTop: 8,
@@ -440,7 +434,7 @@ function createForgotPasswordStyles(colors: AppColors) {
       opacity: 0.7,
     },
     submitButtonText: {
-      color: '#fff',
+      color: colors.text.inverse,
       fontSize: 17,
       fontWeight: '600',
     },
@@ -453,7 +447,7 @@ function createForgotPasswordStyles(colors: AppColors) {
       marginTop: 24,
     },
     backButtonText: {
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
       fontSize: 15,
       fontWeight: '500',
     },
diff --git a/src/screens/auth/LoginScreen.tsx b/src/screens/auth/LoginScreen.tsx
index 3abef85..fc4b792 100644
--- a/src/screens/auth/LoginScreen.tsx
+++ b/src/screens/auth/LoginScreen.tsx
@@ -26,21 +26,17 @@ import {
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { useRouter } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
-import { useAppColors, type AppColors } from '../../theme';
+import { useAppColors, useResolvedColorScheme, type AppColors } from '../../theme';
 import { useAuthStore } from '../../stores';
 import * as hrefs from '../../navigation/hrefs';
 import { useResponsive } from '../../hooks';
 import { showPrompt } from '../../services/promptService';
 
-// 胡萝卜橙主题色
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
+
 
 export const LoginScreen: React.FC = () => {
   const colors = useAppColors();
+  const resolved = useResolvedColorScheme();
   const styles = useMemo(() => createLoginStyles(colors), [colors]);
   const router = useRouter();
   const login = useAuthStore((state) => state.login);
@@ -129,7 +125,7 @@ export const LoginScreen: React.FC = () => {
 
   return (
     <SafeAreaView style={styles.container}>
-      <StatusBar barStyle="dark-content" backgroundColor="#fff" />
+      <StatusBar barStyle={resolved === 'dark' ? 'light-content' : 'dark-content'} backgroundColor={colors.background.paper} />
       <KeyboardAvoidingView
         behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
         style={styles.keyboardView}
@@ -175,7 +171,7 @@ export const LoginScreen: React.FC = () => {
                     returnKeyType="next"
                   />
                   {username.length > 0 && (
-                    <MaterialCommunityIcons name="check-circle" size={20} color={THEME_COLORS.primary} style={styles.checkIcon} />
+                    <MaterialCommunityIcons name="check-circle" size={20} color={colors.primary.main} style={styles.checkIcon} />
                   )}
                 </View>
               </View>
@@ -218,17 +214,17 @@ export const LoginScreen: React.FC = () => {
 
               {/* 服务条款勾选 */}
               <View style={styles.termsContainer}>
-                <TouchableOpacity
-                  onPress={() => setAgreedToTerms(!agreedToTerms)}
-                  activeOpacity={0.8}
-                  style={styles.checkboxWrapper}
-                >
-                  <MaterialCommunityIcons
-                    name={agreedToTerms ? 'checkbox-marked' : 'checkbox-blank-outline'}
-                    size={22}
-                    color={agreedToTerms ? THEME_COLORS.primary : colors.text.hint}
-                  />
-                </TouchableOpacity>
+                  <TouchableOpacity
+                    onPress={() => setAgreedToTerms(!agreedToTerms)}
+                    activeOpacity={0.8}
+                    style={styles.checkboxWrapper}
+                  >
+                    <MaterialCommunityIcons
+                      name={agreedToTerms ? 'checkbox-marked' : 'checkbox-blank-outline'}
+                      size={22}
+                      color={agreedToTerms ? colors.primary.main : colors.text.hint}
+                    />
+                  </TouchableOpacity>
                 <Text style={styles.termsText}>
                   我已阅读并同意
                   <Text
@@ -255,7 +251,7 @@ export const LoginScreen: React.FC = () => {
                 activeOpacity={0.9}
               >
                 {loading ? (
-                  <ActivityIndicator size="small" color="#FFF" />
+                  <ActivityIndicator size="small" color={colors.text.inverse} />
                 ) : (
                   <Text style={styles.loginButtonText}>登 录</Text>
                 )}
@@ -282,7 +278,7 @@ function createLoginStyles(colors: AppColors) {
   return StyleSheet.create({
     container: {
       flex: 1,
-      backgroundColor: '#fff',
+      backgroundColor: colors.background.paper,
     },
     keyboardView: {
       flex: 1,
@@ -317,7 +313,7 @@ function createLoginStyles(colors: AppColors) {
     underline: {
       width: 40,
       height: 4,
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
       borderRadius: 2,
       marginTop: 12,
       marginBottom: 16,
@@ -345,7 +341,7 @@ function createLoginStyles(colors: AppColors) {
     inputWrapper: {
       flexDirection: 'row',
       alignItems: 'center',
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderRadius: 14,
       paddingHorizontal: 18,
       height: 56,
@@ -372,7 +368,7 @@ function createLoginStyles(colors: AppColors) {
     },
     forgotPasswordText: {
       fontSize: 14,
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
       fontWeight: '500',
     },
 
@@ -380,7 +376,7 @@ function createLoginStyles(colors: AppColors) {
     loginButton: {
       height: 56,
       borderRadius: 14,
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
       alignItems: 'center',
       justifyContent: 'center',
     },
@@ -390,7 +386,7 @@ function createLoginStyles(colors: AppColors) {
     loginButtonText: {
       fontSize: 17,
       fontWeight: '600',
-      color: '#FFFFFF',
+      color: colors.text.inverse,
     },
 
     // 底部
@@ -406,7 +402,7 @@ function createLoginStyles(colors: AppColors) {
     },
     registerLink: {
       fontSize: 15,
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
       fontWeight: '600',
       marginLeft: 6,
     },
@@ -419,7 +415,7 @@ function createLoginStyles(colors: AppColors) {
       color: colors.text.hint,
     },
     policyLink: {
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
       fontWeight: '500',
     },
     termsContainer: {
@@ -439,7 +435,7 @@ function createLoginStyles(colors: AppColors) {
       lineHeight: 22,
     },
     termsLink: {
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
       fontWeight: '500',
     },
   });
diff --git a/src/screens/auth/RegisterScreen.tsx b/src/screens/auth/RegisterScreen.tsx
index ff154e7..ab88991 100644
--- a/src/screens/auth/RegisterScreen.tsx
+++ b/src/screens/auth/RegisterScreen.tsx
@@ -25,7 +25,7 @@ import {
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { useRouter } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
-import { useAppColors, type AppColors } from '../../theme';
+import { useAppColors, useResolvedColorScheme, type AppColors } from '../../theme';
 import { authService, resolveAuthApiError } from '../../services/authService';
 import { useAuthStore } from '../../stores';
 import {
@@ -58,6 +58,7 @@ const STEP_COMPONENTS = [
 
 export const RegisterScreen: React.FC = () => {
   const colors = useAppColors();
+  const resolved = useResolvedColorScheme();
   const styles = useMemo(() => createRegisterStyles(colors), [colors]);
   const router = useRouter();
   const register = useAuthStore((state) => state.register);
@@ -232,7 +233,7 @@ export const RegisterScreen: React.FC = () => {
 
   return (
     <SafeAreaView style={styles.container}>
-      <StatusBar barStyle="dark-content" backgroundColor="#fff" />
+      <StatusBar barStyle={resolved === 'dark' ? 'light-content' : 'dark-content'} backgroundColor={colors.background.paper} />
       <KeyboardAvoidingView
         behavior={Platform.OS === 'ios' ? 'padding' : 'height'}
         style={styles.keyboardView}
@@ -295,7 +296,7 @@ function createRegisterStyles(colors: AppColors) {
   return StyleSheet.create({
     container: {
       flex: 1,
-      backgroundColor: '#fff',
+      backgroundColor: colors.background.paper,
     },
     keyboardView: {
       flex: 1,
@@ -316,7 +317,7 @@ function createRegisterStyles(colors: AppColors) {
       width: 40,
       height: 40,
       borderRadius: 20,
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       alignItems: 'center',
       justifyContent: 'center',
     },
@@ -346,7 +347,7 @@ function createRegisterStyles(colors: AppColors) {
     },
     loginLink: {
       fontSize: 15,
-      color: '#FF6B35',
+      color: colors.primary.main,
       fontWeight: '600',
       marginLeft: 6,
     },
diff --git a/src/screens/auth/RegisterStep1Email.tsx b/src/screens/auth/RegisterStep1Email.tsx
index 15f5f66..75e59e4 100644
--- a/src/screens/auth/RegisterStep1Email.tsx
+++ b/src/screens/auth/RegisterStep1Email.tsx
@@ -15,12 +15,6 @@ import { MaterialCommunityIcons } from '@expo/vector-icons';
 import { useAppColors, type AppColors } from '../../theme';
 import { RegisterStepProps } from './types';
 
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 export const RegisterStep1Email: React.FC<RegisterStepProps> = ({
   formData,
   updateFormData,
@@ -91,7 +85,7 @@ export const RegisterStep1Email: React.FC<RegisterStepProps> = ({
                 <MaterialCommunityIcons
                   name="check-circle"
                   size={20}
-                  color={THEME_COLORS.primary}
+                  color={colors.primary.main}
                   style={styles.checkIcon}
                 />
               )}
@@ -145,7 +139,7 @@ function createStyles(colors: AppColors) {
     inputWrapper: {
       flexDirection: 'row',
       alignItems: 'center',
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderRadius: 14,
       paddingHorizontal: 18,
       height: 56,
@@ -173,7 +167,7 @@ function createStyles(colors: AppColors) {
     actionButton: {
       height: 56,
       borderRadius: 14,
-      backgroundColor: '#FF6B35',
+      backgroundColor: colors.primary.main,
       alignItems: 'center',
       justifyContent: 'center',
       marginTop: 8,
@@ -184,7 +178,7 @@ function createStyles(colors: AppColors) {
     actionButtonText: {
       fontSize: 17,
       fontWeight: '600',
-      color: '#FFFFFF',
+      color: colors.text.inverse,
     },
   });
 }
diff --git a/src/screens/auth/RegisterStep2Verification.tsx b/src/screens/auth/RegisterStep2Verification.tsx
index cb914f9..42eff63 100644
--- a/src/screens/auth/RegisterStep2Verification.tsx
+++ b/src/screens/auth/RegisterStep2Verification.tsx
@@ -1,8 +1,3 @@
-/**
- * 注册步骤2：填写验证码
- * 使用 VerificationCodeInput 组件
- */
-
 import React, { useState } from 'react';
 import {
   View,
@@ -15,12 +10,6 @@ import { useAppColors, type AppColors } from '../../theme';
 import { VerificationCodeInput } from '../../components/common';
 import { RegisterStepProps } from './types';
 
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 export const RegisterStep2Verification: React.FC<RegisterStepProps> = ({
   formData,
   updateFormData,
@@ -175,13 +164,13 @@ function createStyles(colors: AppColors) {
     },
     resendText: {
       fontSize: 14,
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
       fontWeight: '500',
     },
     actionButton: {
       height: 56,
       borderRadius: 14,
-      backgroundColor: '#FF6B35',
+      backgroundColor: colors.primary.main,
       alignItems: 'center',
       justifyContent: 'center',
       width: '100%',
@@ -193,7 +182,7 @@ function createStyles(colors: AppColors) {
     actionButtonText: {
       fontSize: 17,
       fontWeight: '600',
-      color: '#FFFFFF',
+      color: colors.text.inverse,
     },
     backButton: {
       flexDirection: 'row',
diff --git a/src/screens/auth/RegisterStep3Profile.tsx b/src/screens/auth/RegisterStep3Profile.tsx
index 06db465..e8d8451 100644
--- a/src/screens/auth/RegisterStep3Profile.tsx
+++ b/src/screens/auth/RegisterStep3Profile.tsx
@@ -1,8 +1,3 @@
-/**
- * 注册步骤3：设置用户信息
- * 包含用户名、昵称、密码等
- */
-
 import React, { useState } from 'react';
 import {
   View,
@@ -18,12 +13,6 @@ import { useAppColors, type AppColors } from '../../theme';
 import { RegisterStepProps } from './types';
 import * as hrefs from '../../navigation/hrefs';
 
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 export const RegisterStep3Profile: React.FC<RegisterStepProps> = ({
   formData,
   updateFormData,
@@ -208,7 +197,7 @@ export const RegisterStep3Profile: React.FC<RegisterStepProps> = ({
             <MaterialCommunityIcons
               name={agreedToTerms ? 'checkbox-marked' : 'checkbox-blank-outline'}
               size={22}
-              color={agreedToTerms ? THEME_COLORS.primary : colors.text?.hint || '#999'}
+              color={agreedToTerms ? colors.primary.main : colors.text?.hint || '#999'}
             />
           </TouchableOpacity>
           <Text style={styles.termsText}>
@@ -288,7 +277,7 @@ function createStyles(colors: AppColors) {
     inputWrapper: {
       flexDirection: 'row',
       alignItems: 'center',
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderRadius: 14,
       paddingHorizontal: 18,
       height: 52,
@@ -331,13 +320,13 @@ function createStyles(colors: AppColors) {
       lineHeight: 22,
     },
     termsLink: {
-      color: '#FF6B35',
+      color: colors.primary.main,
       fontWeight: '500',
     },
     actionButton: {
       height: 56,
       borderRadius: 14,
-      backgroundColor: '#FF6B35',
+      backgroundColor: colors.primary.main,
       alignItems: 'center',
       justifyContent: 'center',
     },
@@ -347,7 +336,7 @@ function createStyles(colors: AppColors) {
     actionButtonText: {
       fontSize: 17,
       fontWeight: '600',
-      color: '#FFFFFF',
+      color: colors.text.inverse,
     },
     backButton: {
       flexDirection: 'row',
diff --git a/src/screens/auth/VerificationFormScreen.tsx b/src/screens/auth/VerificationFormScreen.tsx
index 0140981..dd55aef 100644
--- a/src/screens/auth/VerificationFormScreen.tsx
+++ b/src/screens/auth/VerificationFormScreen.tsx
@@ -26,12 +26,6 @@ import { showPrompt } from '../../services/promptService';
 import { uploadService } from '../../services/uploadService';
 import type { UserIdentity } from '../../types/dto';
 
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 const IDENTITY_CONFIG: Record<string, { title: string; idField: string; idLabel: string }> = {
   student: { title: '在校学生', idField: 'student_id', idLabel: '学号' },
   teacher: { title: '教职工', idField: 'employee_id', idLabel: '工号' },
@@ -230,7 +224,7 @@ export const VerificationFormScreen: React.FC = () => {
           <MaterialCommunityIcons
             name="information-outline"
             size={20}
-            color={THEME_COLORS.primary}
+            color={colors.primary.main}
           />
           <Text style={styles.infoText}>
             请填写真实信息，上传清晰的证明材料照片，审核通过后将获得认证标识
@@ -303,7 +297,7 @@ export const VerificationFormScreen: React.FC = () => {
           disabled={isLoading || uploading}
         >
           {(isLoading || uploading) ? (
-            <ActivityIndicator size="small" color="#FFF" />
+            <ActivityIndicator size="small" color={colors.text.inverse} />
           ) : (
             <Text style={styles.submitButtonText}>提交认证申请</Text>
           )}
@@ -317,7 +311,7 @@ function createStyles(colors: AppColors) {
   return StyleSheet.create({
     container: {
       flex: 1,
-      backgroundColor: '#fff',
+      backgroundColor: colors.background.paper,
     },
     header: {
       flexDirection: 'row',
@@ -349,7 +343,7 @@ function createStyles(colors: AppColors) {
     infoCard: {
       flexDirection: 'row',
       alignItems: 'flex-start',
-      backgroundColor: '#FFF5F0',
+      backgroundColor: colors.primary.main + '15',
       borderRadius: 12,
       padding: 16,
       marginBottom: 24,
@@ -374,7 +368,7 @@ function createStyles(colors: AppColors) {
       marginBottom: 8,
     },
     required: {
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
     },
     hintText: {
       fontSize: 13,
@@ -382,7 +376,7 @@ function createStyles(colors: AppColors) {
       marginBottom: 8,
     },
     inputWrapper: {
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderRadius: 12,
       paddingHorizontal: 16,
       height: 50,
@@ -404,7 +398,7 @@ function createStyles(colors: AppColors) {
       marginTop: 6,
     },
     uploadButton: {
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderRadius: 12,
       overflow: 'hidden',
       minHeight: 200,
@@ -433,7 +427,7 @@ function createStyles(colors: AppColors) {
     submitButton: {
       height: 56,
       borderRadius: 14,
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
       justifyContent: 'center',
       alignItems: 'center',
     },
@@ -443,7 +437,7 @@ function createStyles(colors: AppColors) {
     submitButtonText: {
       fontSize: 17,
       fontWeight: '600',
-      color: '#FFFFFF',
+      color: colors.text.inverse,
     },
   });
 }
diff --git a/src/screens/auth/VerificationGuideScreen.tsx b/src/screens/auth/VerificationGuideScreen.tsx
index 1711f2f..0d3b70f 100644
--- a/src/screens/auth/VerificationGuideScreen.tsx
+++ b/src/screens/auth/VerificationGuideScreen.tsx
@@ -1,8 +1,3 @@
-/**
- * 注册后身份认证引导页面
- * 可跳过的认证界面，引导用户完成身份认证
- */
-
 import React, { useState } from 'react';
 import {
   View,
@@ -10,7 +5,6 @@ import {
   StyleSheet,
   TouchableOpacity,
   ScrollView,
-  Image,
   Alert,
 } from 'react-native';
 import { SafeAreaView } from 'react-native-safe-area-context';
@@ -19,12 +13,6 @@ import { MaterialCommunityIcons } from '@expo/vector-icons';
 import { useAppColors, type AppColors } from '../../theme';
 import * as hrefs from '../../navigation/hrefs';
 
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 // 身份类型选项
 const IDENTITY_OPTIONS = [
   {
@@ -98,7 +86,7 @@ export const VerificationGuideScreen: React.FC = () => {
           <MaterialCommunityIcons
             name={option.icon as any}
             size={32}
-            color={isSelected ? THEME_COLORS.primary : colors.text?.secondary || '#666'}
+            color={isSelected ? colors.primary.main : colors.text?.secondary || '#666'}
           />
         </View>
         <View style={styles.identityContent}>
@@ -112,7 +100,7 @@ export const VerificationGuideScreen: React.FC = () => {
             <MaterialCommunityIcons
               name="check-circle"
               size={24}
-              color={THEME_COLORS.primary}
+              color={colors.primary.main}
             />
           )}
         </View>
@@ -132,7 +120,7 @@ export const VerificationGuideScreen: React.FC = () => {
             <MaterialCommunityIcons
               name="shield-check-outline"
               size={48}
-              color={THEME_COLORS.primary}
+              color={colors.primary.main}
             />
           </View>
           <Text style={styles.title}>身份认证</Text>
@@ -147,7 +135,7 @@ export const VerificationGuideScreen: React.FC = () => {
             <MaterialCommunityIcons
               name="check-decagram"
               size={20}
-              color={THEME_COLORS.primary}
+              color={colors.primary.main}
             />
             <Text style={styles.benefitText}>获得认证标识</Text>
           </View>
@@ -155,7 +143,7 @@ export const VerificationGuideScreen: React.FC = () => {
             <MaterialCommunityIcons
               name="lock-open-outline"
               size={20}
-              color={THEME_COLORS.primary}
+              color={colors.primary.main}
             />
             <Text style={styles.benefitText}>解锁专属频道</Text>
           </View>
@@ -163,7 +151,7 @@ export const VerificationGuideScreen: React.FC = () => {
             <MaterialCommunityIcons
               name="account-group-outline"
               size={20}
-              color={THEME_COLORS.primary}
+              color={colors.primary.main}
             />
             <Text style={styles.benefitText}>加入社群圈子</Text>
           </View>
@@ -198,7 +186,7 @@ function createStyles(colors: AppColors) {
   return StyleSheet.create({
     container: {
       flex: 1,
-      backgroundColor: '#fff',
+      backgroundColor: colors.background.paper,
     },
     scrollContent: {
       flexGrow: 1,
@@ -214,7 +202,7 @@ function createStyles(colors: AppColors) {
       width: 100,
       height: 100,
       borderRadius: 50,
-      backgroundColor: '#FFF5F0',
+      backgroundColor: colors.primary.main + '15',
       justifyContent: 'center',
       alignItems: 'center',
       marginBottom: 20,
@@ -258,15 +246,15 @@ function createStyles(colors: AppColors) {
       flexDirection: 'row',
       alignItems: 'center',
       padding: 16,
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderRadius: 14,
       marginBottom: 12,
       borderWidth: 2,
       borderColor: 'transparent',
     },
     identityCardSelected: {
-      backgroundColor: '#FFF5F0',
-      borderColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main + '15',
+      borderColor: colors.primary.main,
     },
     identityIconContainer: {
       width: 48,
@@ -285,7 +273,7 @@ function createStyles(colors: AppColors) {
       marginBottom: 4,
     },
     identityTitleSelected: {
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
     },
     identityDescription: {
       fontSize: 13,
@@ -303,17 +291,17 @@ function createStyles(colors: AppColors) {
     continueButton: {
       height: 56,
       borderRadius: 14,
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
       justifyContent: 'center',
       alignItems: 'center',
     },
     continueButtonDisabled: {
-      backgroundColor: '#ccc',
+      backgroundColor: colors.background.disabled,
     },
     continueButtonText: {
       fontSize: 17,
       fontWeight: '600',
-      color: '#fff',
+      color: colors.text.inverse,
     },
     skipButton: {
       height: 56,
diff --git a/src/screens/message/ChatScreen.tsx b/src/screens/message/ChatScreen.tsx
index c9525dd..b737cc3 100644
--- a/src/screens/message/ChatScreen.tsx
+++ b/src/screens/message/ChatScreen.tsx
@@ -33,7 +33,7 @@ import { useNavigation, useRouter } from 'expo-router';
 import { StatusBar } from 'expo-status-bar';
 import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
 import { Text, ImageGallery, ImageGridItem } from '../../components/common';
-import { useAppColors } from '../../theme';
+import { useAppColors, useResolvedColorScheme } from '../../theme';
 import * as hrefs from '../../navigation/hrefs';
 import { messageManager, callStore } from '../../stores';
 import { useBreakpointGTE } from '../../hooks/useResponsive';
@@ -56,6 +56,7 @@ export const ChatScreen: React.FC = () => {
   const router = useRouter();
   const insets = useSafeAreaInsets();
   const colors = useAppColors();
+  const resolved = useResolvedColorScheme();
   const styles = useChatScreenStyles();
 
   // 响应式布局
@@ -406,7 +407,7 @@ export const ChatScreen: React.FC = () => {
         behavior={Platform.OS === 'ios' ? 'padding' : undefined}
         keyboardVerticalOffset={Platform.OS === 'ios' ? 0 : 0}
       >
-        <StatusBar style="dark" backgroundColor="#FFFFFF" />
+        <StatusBar style={resolved === 'dark' ? 'light' : 'dark'} backgroundColor={colors.background.paper} />
       
       {/* 顶部栏 */}
       <ChatHeader
@@ -499,7 +500,7 @@ export const ChatScreen: React.FC = () => {
           >
             <View
               style={{
-                backgroundColor: 'rgba(255,255,255,0.9)',
+                backgroundColor: colors.background.paper + 'E6',
                 borderRadius: 12,
                 paddingHorizontal: 10,
                 paddingVertical: 6,
diff --git a/src/screens/message/NotificationsScreen.tsx b/src/screens/message/NotificationsScreen.tsx
index 1b671e8..3841fb6 100644
--- a/src/screens/message/NotificationsScreen.tsx
+++ b/src/screens/message/NotificationsScreen.tsx
@@ -28,7 +28,7 @@ import { SafeAreaView } from 'react-native-safe-area-context';
 import { useIsFocused } from '@react-navigation/native';
 import { useRouter } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
-import { spacing, borderRadius, useAppColors, type AppColors } from '../../theme';
+import { spacing, borderRadius, useAppColors, useResolvedColorScheme, type AppColors } from '../../theme';
 import { SystemMessageResponse } from '../../types/dto';
 import { messageService } from '../../services/messageService';
 import { commentService } from '../../services/commentService';
@@ -49,18 +49,12 @@ const MESSAGE_TYPES = [
   { key: 'announcement', title: '公告' },
 ];
 
-// 胡萝卜橙主题色
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 const LIKE_SYSTEM_TYPES = new Set(['like_post', 'like_comment', 'like_reply', 'favorite_post']);
 const GROUP_SYSTEM_TYPES = new Set(['group_invite', 'group_join_apply', 'group_join_approved', 'group_join_rejected']);
 
 export const NotificationsScreen: React.FC<{ onBack?: () => void }> = ({ onBack }) => {
   const colors = useAppColors();
+  const resolved = useResolvedColorScheme();
   const styles = useMemo(() => createNotificationsStyles(colors), [colors]);
   const isFocused = useIsFocused();
   const { setSystemUnreadCount, decrementSystemUnreadCount } = useMessageManagerSystemUnreadCount();
@@ -424,9 +418,9 @@ export const NotificationsScreen: React.FC<{ onBack?: () => void }> = ({ onBack
   if (!isHydrated) {
     return (
       <SafeAreaView style={styles.container} edges={['bottom']}>
-        <StatusBar barStyle="dark-content" backgroundColor="#fff" />
+        <StatusBar barStyle={resolved === 'dark' ? 'light-content' : 'dark-content'} backgroundColor={colors.background.paper} />
         <View style={styles.loadingContainer}>
-          <ActivityIndicator size="large" color={THEME_COLORS.primary} />
+          <ActivityIndicator size="large" color={colors.primary.main} />
         </View>
       </SafeAreaView>
     );
@@ -434,7 +428,7 @@ export const NotificationsScreen: React.FC<{ onBack?: () => void }> = ({ onBack
 
   return (
     <SafeAreaView style={styles.container} edges={['bottom']}>
-      <StatusBar barStyle="dark-content" backgroundColor="#fff" />
+      <StatusBar barStyle={resolved === 'dark' ? 'light-content' : 'dark-content'} backgroundColor={colors.background.paper} />
       <Animated.View
         style={[
           styles.content,
@@ -499,7 +493,7 @@ export const NotificationsScreen: React.FC<{ onBack?: () => void }> = ({ onBack
             {/* 消息列表 */}
             {isLoading && messages.length === 0 ? (
               <View style={styles.loadingContainer}>
-                <ActivityIndicator size="large" color={THEME_COLORS.primary} />
+                <ActivityIndicator size="large" color={colors.primary.main} />
               </View>
             ) : (
               <FlatList
@@ -519,8 +513,8 @@ export const NotificationsScreen: React.FC<{ onBack?: () => void }> = ({ onBack
                   <RefreshControl
                     refreshing={refreshing}
                     onRefresh={onRefresh}
-                    colors={[THEME_COLORS.primary]}
-                    tintColor={THEME_COLORS.primary}
+                    colors={[colors.primary.main]}
+                    tintColor={colors.primary.main}
                   />
                 }
               />
@@ -580,7 +574,7 @@ export const NotificationsScreen: React.FC<{ onBack?: () => void }> = ({ onBack
             {/* 消息列表 */}
             {isLoading && messages.length === 0 ? (
               <View style={styles.loadingContainer}>
-                <ActivityIndicator size="large" color={THEME_COLORS.primary} />
+                <ActivityIndicator size="large" color={colors.primary.main} />
               </View>
             ) : (
               <FlatList
@@ -600,8 +594,8 @@ export const NotificationsScreen: React.FC<{ onBack?: () => void }> = ({ onBack
                   <RefreshControl
                     refreshing={refreshing}
                     onRefresh={onRefresh}
-                    colors={[THEME_COLORS.primary]}
-                    tintColor={THEME_COLORS.primary}
+                    colors={[colors.primary.main]}
+                    tintColor={colors.primary.main}
                   />
                 }
               />
@@ -617,7 +611,7 @@ function createNotificationsStyles(colors: AppColors) {
   return StyleSheet.create({
     container: {
       flex: 1,
-      backgroundColor: '#fff',
+      backgroundColor: colors.background.paper,
     },
     content: {
       flex: 1,
@@ -629,7 +623,7 @@ function createNotificationsStyles(colors: AppColors) {
       justifyContent: 'space-between',
       paddingHorizontal: 20,
       paddingVertical: 16,
-      backgroundColor: '#fff',
+      backgroundColor: colors.background.paper,
     },
     headerWide: {
       paddingHorizontal: 32,
@@ -650,7 +644,7 @@ function createNotificationsStyles(colors: AppColors) {
       fontSize: 20,
     },
     unreadBadge: {
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
       borderRadius: 10,
       paddingHorizontal: 6,
       paddingVertical: 2,
@@ -660,7 +654,7 @@ function createNotificationsStyles(colors: AppColors) {
       justifyContent: 'center',
     },
     unreadBadgeText: {
-      color: '#fff',
+      color: colors.text.inverse,
       fontSize: 11,
       fontWeight: '600',
     },
@@ -674,7 +668,7 @@ function createNotificationsStyles(colors: AppColors) {
       width: 40,
       height: 40,
       borderRadius: 20,
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       justifyContent: 'center',
       alignItems: 'center',
     },
@@ -686,7 +680,7 @@ function createNotificationsStyles(colors: AppColors) {
       flexDirection: 'row',
       paddingHorizontal: 16,
       paddingVertical: 12,
-      backgroundColor: '#fff',
+      backgroundColor: colors.background.paper,
       borderBottomWidth: 1,
       borderBottomColor: colors.divider || '#E5E5EA',
     },
@@ -702,7 +696,7 @@ function createNotificationsStyles(colors: AppColors) {
       paddingVertical: 8,
       marginRight: 8,
       borderRadius: 14,
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderWidth: 1,
       borderColor: 'transparent',
     },
@@ -712,15 +706,15 @@ function createNotificationsStyles(colors: AppColors) {
       marginRight: 10,
     },
     filterTagActive: {
-      backgroundColor: THEME_COLORS.primary,
-      borderColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
+      borderColor: colors.primary.main,
     },
     filterTagTextActive: {
       fontWeight: '600',
     },
     filterCount: {
       marginLeft: 6,
-      backgroundColor: THEME_COLORS.primaryLight + '40',
+      backgroundColor: colors.primary.light + '40',
       paddingHorizontal: 6,
       paddingVertical: 1,
       borderRadius: 8,
@@ -770,7 +764,7 @@ function createNotificationsStyles(colors: AppColors) {
       width: 120,
       height: 120,
       borderRadius: 60,
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       justifyContent: 'center',
       alignItems: 'center',
       marginBottom: 24,
diff --git a/src/screens/profile/AccountDeletionScreen.tsx b/src/screens/profile/AccountDeletionScreen.tsx
index ff8e35f..5069b1a 100644
--- a/src/screens/profile/AccountDeletionScreen.tsx
+++ b/src/screens/profile/AccountDeletionScreen.tsx
@@ -21,13 +21,6 @@ import * as hrefs from '../../navigation/hrefs';
 
 const CONTENT_MAX_WIDTH = 720;
 
-// 胡萝卜橙主题色
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 function createAccountDeletionStyles(colors: AppColors) {
   return StyleSheet.create({
     container: {
@@ -114,7 +107,7 @@ function createAccountDeletionStyles(colors: AppColors) {
     },
     // 输入框 - 扁平化风格
     input: {
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderRadius: 14,
       padding: spacing.md,
       fontSize: 16,
@@ -133,12 +126,12 @@ function createAccountDeletionStyles(colors: AppColors) {
       flex: 1,
       height: 56,
       borderRadius: 14,
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
       alignItems: 'center',
       justifyContent: 'center',
     },
     primaryButtonText: {
-      color: '#fff',
+      color: colors.text.inverse,
       fontSize: fontSizes.md,
       fontWeight: '600',
     },
@@ -166,7 +159,7 @@ function createAccountDeletionStyles(colors: AppColors) {
       justifyContent: 'center',
     },
     dangerButtonText: {
-      color: '#fff',
+      color: colors.text.inverse,
       fontSize: fontSizes.md,
       fontWeight: '600',
     },
@@ -392,9 +385,9 @@ export const AccountDeletionScreen: React.FC = () => {
                   onPress={handleRequestDeletion}
                   disabled={submitting || !password.trim()}
                 >
-                  {submitting ? (
-                    <ActivityIndicator size="small" color="#fff" />
-                  ) : (
+              {submitting ? (
+                <ActivityIndicator size="small" color={colors.text.inverse} />
+              ) : (
                     <Text style={styles.dangerButtonText}>确认注销</Text>
                   )}
                 </TouchableOpacity>
diff --git a/src/screens/profile/AccountSecurityScreen.tsx b/src/screens/profile/AccountSecurityScreen.tsx
index 70262ba..907a924 100644
--- a/src/screens/profile/AccountSecurityScreen.tsx
+++ b/src/screens/profile/AccountSecurityScreen.tsx
@@ -16,13 +16,6 @@ import { useResponsive, useResponsiveSpacing } from '../../hooks';
 // 内容最大宽度
 const CONTENT_MAX_WIDTH = 720;
 
-// 胡萝卜橙主题色
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 import { authService, resolveAuthApiError } from '../../services/authService';
 import { showPrompt } from '../../services/promptService';
 import { useAuthStore } from '../../stores';
@@ -263,9 +256,9 @@ export const AccountSecurityScreen: React.FC = () => {
                 onPress={handleSendCode}
                 disabled={sendingCode || countdown > 0}
               >
-                {sendingCode ? (
-                  <ActivityIndicator size="small" color="#fff" />
-                ) : (
+              {sendingCode ? (
+                <ActivityIndicator size="small" color={colors.text.inverse} />
+              ) : (
                   <Text style={styles.sendCodeButtonText}>{countdown > 0 ? `${countdown}s` : '发送验证码'}</Text>
                 )}
               </TouchableOpacity>
@@ -278,7 +271,7 @@ export const AccountSecurityScreen: React.FC = () => {
               disabled={verifyingEmail}
             >
               {verifyingEmail ? (
-                <ActivityIndicator size="small" color="#fff" />
+                <ActivityIndicator size="small" color={colors.text.inverse} />
               ) : (
                 <Text style={styles.primaryButtonText}>验证邮箱</Text>
               )}
@@ -352,7 +345,7 @@ export const AccountSecurityScreen: React.FC = () => {
                 disabled={sendingChangePwdCode || changePwdCountdown > 0}
               >
                 {sendingChangePwdCode ? (
-                  <ActivityIndicator size="small" color="#fff" />
+                  <ActivityIndicator size="small" color={colors.text.inverse} />
                 ) : (
                   <Text style={styles.sendCodeButtonText}>
                     {changePwdCountdown > 0 ? `${changePwdCountdown}s` : '发送验证码'}
@@ -368,7 +361,7 @@ export const AccountSecurityScreen: React.FC = () => {
               disabled={updatingPassword}
             >
               {updatingPassword ? (
-                <ActivityIndicator size="small" color="#fff" />
+                <ActivityIndicator size="small" color={colors.text.inverse} />
               ) : (
                 <Text style={styles.primaryButtonText}>更新密码</Text>
               )}
@@ -432,26 +425,26 @@ function createAccountSecurityStyles(colors: AppColors) {
       borderRadius: borderRadius.sm,
     },
     statusVerified: {
-      backgroundColor: '#E8F5E9',
+      backgroundColor: colors.success.light + '30',
     },
     statusUnverified: {
-      backgroundColor: '#FFF3E0',
+      backgroundColor: colors.warning.light + '30',
     },
     statusText: {
       fontSize: 13,
       fontWeight: '600',
     },
     statusVerifiedText: {
-      color: '#2E7D32',
+      color: colors.success.dark,
     },
     statusUnverifiedText: {
-      color: '#E65100',
+      color: colors.warning.dark,
     },
     // 输入框样式 - 扁平化风格，与登录页一致
     inputWrapper: {
       flexDirection: 'row',
       alignItems: 'center',
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderRadius: 14,
       paddingHorizontal: spacing.lg,
       height: 56,
@@ -485,13 +478,13 @@ function createAccountSecurityStyles(colors: AppColors) {
       height: 56,
       minWidth: 110,
       borderRadius: 14,
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
       alignItems: 'center',
       justifyContent: 'center',
       paddingHorizontal: spacing.sm,
     },
     sendCodeButtonText: {
-      color: '#fff',
+      color: colors.text.inverse,
       fontSize: fontSizes.sm,
       fontWeight: '600',
     },
@@ -499,14 +492,14 @@ function createAccountSecurityStyles(colors: AppColors) {
     primaryButton: {
       height: 56,
       borderRadius: 14,
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
       alignItems: 'center',
       justifyContent: 'center',
       marginTop: spacing.xs,
       marginHorizontal: spacing['2xl'],
     },
     primaryButtonText: {
-      color: '#fff',
+      color: colors.text.inverse,
       fontSize: fontSizes.md,
       fontWeight: '600',
     },
diff --git a/src/screens/profile/NotificationSettingsScreen.tsx b/src/screens/profile/NotificationSettingsScreen.tsx
index 68bcc5d..1aca70f 100644
--- a/src/screens/profile/NotificationSettingsScreen.tsx
+++ b/src/screens/profile/NotificationSettingsScreen.tsx
@@ -10,6 +10,8 @@ import {
   StyleSheet,
   Switch,
   ScrollView,
+  Alert,
+  TouchableOpacity,
 } from 'react-native';
 import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
@@ -22,6 +24,7 @@ import {
   setVibrationPreference,
 } from '../../services/notificationPreferences';
 import { useResponsive, useResponsiveSpacing } from '../../hooks';
+import { backgroundSyncManager, BackgroundSyncMode } from '../../services/BackgroundSyncManager';
 
 // 内容最大宽度
 const CONTENT_MAX_WIDTH = 720;
@@ -41,6 +44,7 @@ export const NotificationSettingsScreen: React.FC = () => {
   const [vibrationEnabled, setVibrationEnabledState] = useState(true);
   const [pushEnabled, setPushEnabled] = useState(true);
   const [soundEnabled, setSoundEnabled] = useState(true);
+  const [syncMode, setSyncMode] = useState<BackgroundSyncMode>(BackgroundSyncMode.BATTERY_SAVER);
   const { isWideScreen, isMobile } = useResponsive();
   const insets = useSafeAreaInsets();
   
@@ -55,6 +59,7 @@ export const NotificationSettingsScreen: React.FC = () => {
         setVibrationEnabledState(prefs.vibrationEnabled);
         setPushEnabled(prefs.pushEnabled);
         setSoundEnabled(prefs.soundEnabled);
+        setSyncMode(backgroundSyncManager.getMode());
       } catch (error) {
         console.error('加载通知设置失败:', error);
       }
@@ -89,6 +94,51 @@ export const NotificationSettingsScreen: React.FC = () => {
     }
   };
 
+  const handleSyncModeChange = async (mode: BackgroundSyncMode) => {
+    if (mode === BackgroundSyncMode.REALTIME) {
+      Alert.alert(
+        '实时模式',
+        '实时模式会在通知栏显示常驻通知以保持应用后台运行，确保消息即时同步。\n\n' +
+        '建议在系统设置中将应用加入电池优化白名单以获得最佳效果。\n\n' +
+        '注意：此模式可能增加电池消耗。',
+        [
+          { text: '取消', style: 'cancel' },
+          {
+            text: '开启',
+            onPress: async () => {
+              await backgroundSyncManager.setMode(mode);
+              setSyncMode(mode);
+            },
+          },
+        ]
+      );
+    } else {
+      await backgroundSyncManager.setMode(mode);
+      setSyncMode(mode);
+    }
+  };
+
+  const syncModeOptions: { mode: BackgroundSyncMode; title: string; subtitle: string; icon: string }[] = [
+    {
+      mode: BackgroundSyncMode.BATTERY_SAVER,
+      title: '省电模式',
+      subtitle: '系统后台任务，每 15 分钟检查一次',
+      icon: 'leaf',
+    },
+    {
+      mode: BackgroundSyncMode.REALTIME,
+      title: '实时模式',
+      subtitle: '通知栏常驻保活，即时同步消息',
+      icon: 'lightning-bolt',
+    },
+    {
+      mode: BackgroundSyncMode.DISABLED,
+      title: '禁用',
+      subtitle: '仅在应用打开时接收消息',
+      icon: 'close-circle-outline',
+    },
+  ];
+
   const settings: NotificationSettingItem[] = [
     {
       key: 'push',
@@ -164,6 +214,62 @@ export const NotificationSettingsScreen: React.FC = () => {
           关闭推送通知后，您将不再收到任何消息提醒，但消息仍会在应用内显示。
         </Text>
       </View>
+
+      {/* 后台同步模式 */}
+      <View style={styles.section}>
+        <View style={styles.sectionHeader}>
+          <Text variant="caption" style={styles.sectionTitle}>
+            后台同步模式
+          </Text>
+        </View>
+        {syncModeOptions.map((option) => (
+          <TouchableOpacity
+            key={option.mode}
+            style={[
+              styles.settingItem,
+              syncMode === option.mode && styles.settingItemActive,
+            ]}
+            onPress={() => handleSyncModeChange(option.mode)}
+            activeOpacity={0.7}
+          >
+            <View style={styles.iconContainer}>
+              <MaterialCommunityIcons
+                name={option.icon as any}
+                size={22}
+                color={syncMode === option.mode ? colors.primary.main : colors.text.secondary}
+              />
+            </View>
+            <View style={styles.settingContent}>
+              <Text
+                variant="body"
+                color={syncMode === option.mode ? colors.primary.main : colors.text.primary}
+              >
+                {option.title}
+              </Text>
+              <Text variant="caption" color={colors.text.secondary} style={styles.subtitle}>
+                {option.subtitle}
+              </Text>
+            </View>
+            {syncMode === option.mode && (
+              <MaterialCommunityIcons
+                name="check"
+                size={20}
+                color={colors.primary.main}
+              />
+            )}
+          </TouchableOpacity>
+        ))}
+      </View>
+
+      {/* 实时模式说明 */}
+      {syncMode === BackgroundSyncMode.REALTIME && (
+        <View style={styles.tipContainer}>
+          <MaterialCommunityIcons name="shield-check-outline" size={16} color={colors.text.hint} />
+          <Text variant="caption" color={colors.text.hint} style={styles.tipText}>
+            实时模式已开启，应用将在通知栏显示常驻通知以保持后台运行。如需更稳定的后台运行，请在系统设置中将本应用加入电池优化白名单。
+          </Text>
+        </View>
+      )}
     </>
   );
 
@@ -210,6 +316,9 @@ function createNotificationSettingsStyles(colors: AppColors) {
       borderBottomWidth: StyleSheet.hairlineWidth,
       borderBottomColor: colors.divider,
     },
+    settingItemActive: {
+      backgroundColor: colors.primary.main + '0D',
+    },
     iconContainer: {
       width: 24,
       height: 24,
diff --git a/src/screens/profile/PrivacySettingsScreen.tsx b/src/screens/profile/PrivacySettingsScreen.tsx
index ab0c82d..0ae3a08 100644
--- a/src/screens/profile/PrivacySettingsScreen.tsx
+++ b/src/screens/profile/PrivacySettingsScreen.tsx
@@ -18,13 +18,6 @@ import type { PrivacySettingsDTO, VisibilityLevel } from '../../types/dto';
 
 const CONTENT_MAX_WIDTH = 720;
 
-// 胡萝卜橙主题色
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 const VISIBILITY_OPTIONS: { value: VisibilityLevel; label: string; description: string }[] = [
   { value: 'everyone', label: '所有人可见', description: '任何人都可查看' },
   { value: 'following', label: '仅关注的人可见', description: '只有你关注的人可查看' },
@@ -74,7 +67,7 @@ function createPrivacySettingsStyles(colors: AppColors) {
     },
     // 隐私设置项 - 扁平化卡片风格
     item: {
-      backgroundColor: '#F5F5F7',
+      backgroundColor: colors.background.default,
       borderRadius: 14,
       padding: spacing.lg,
       marginHorizontal: spacing['2xl'],
@@ -111,15 +104,15 @@ function createPrivacySettingsStyles(colors: AppColors) {
       backgroundColor: colors.background.paper,
     },
     optionButtonActive: {
-      backgroundColor: THEME_COLORS.primary,
-      borderColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
+      borderColor: colors.primary.main,
     },
     optionText: {
       fontSize: 13,
       color: colors.text.primary,
     },
     optionTextActive: {
-      color: '#fff',
+      color: colors.text.inverse,
       fontWeight: '500',
     },
   });
diff --git a/src/screens/profile/VerificationSettingsScreen.tsx b/src/screens/profile/VerificationSettingsScreen.tsx
index 79b3aae..77cee0b 100644
--- a/src/screens/profile/VerificationSettingsScreen.tsx
+++ b/src/screens/profile/VerificationSettingsScreen.tsx
@@ -26,12 +26,6 @@ import {
 import { showPrompt } from '../../services/promptService';
 import * as hrefs from '../../navigation/hrefs';
 
-const THEME_COLORS = {
-  primary: '#FF6B35',
-  primaryLight: '#FF8C5A',
-  primaryDark: '#E55A2B',
-};
-
 const STATUS_CONFIG = {
   not_submitted: {
     title: '未认证',
@@ -99,7 +93,7 @@ export const VerificationSettingsScreen: React.FC = () => {
     return (
       <SafeAreaView style={styles.container}>
         <View style={styles.loadingContainer}>
-          <ActivityIndicator size="large" color={THEME_COLORS.primary} />
+          <ActivityIndicator size="large" color={colors.primary.main} />
         </View>
       </SafeAreaView>
     );
@@ -110,10 +104,11 @@ export const VerificationSettingsScreen: React.FC = () => {
   const identityText = IDENTITY_TEXT[status?.identity || 'general'];
 
   return (
-    <ScrollView
-      contentContainerStyle={styles.scrollContent}
-      showsVerticalScrollIndicator={false}
-    >
+    <SafeAreaView style={styles.container}>
+      <ScrollView
+        contentContainerStyle={styles.scrollContent}
+        showsVerticalScrollIndicator={false}
+      >
         {/* 状态卡片 */}
         <View style={styles.statusCard}>
           <View style={[styles.statusIconContainer, { backgroundColor: statusConfig.color + '20' }]}>
@@ -128,7 +123,7 @@ export const VerificationSettingsScreen: React.FC = () => {
 
           {status?.verification_status === 'approved' && (
             <View style={styles.identityBadge}>
-              <MaterialCommunityIcons name="check-circle" size={16} color={THEME_COLORS.primary} />
+              <MaterialCommunityIcons name="check-circle" size={16} color={colors.primary.main} />
               <Text style={styles.identityText}>{identityText}</Text>
             </View>
           )}
@@ -153,7 +148,7 @@ export const VerificationSettingsScreen: React.FC = () => {
                   <MaterialCommunityIcons
                     name="check-decagram"
                     size={24}
-                    color={THEME_COLORS.primary}
+                    color={colors.primary.main}
                   />
                 </View>
                 <View style={styles.benefitContent}>
@@ -169,7 +164,7 @@ export const VerificationSettingsScreen: React.FC = () => {
                   <MaterialCommunityIcons
                     name="lock-open-outline"
                     size={24}
-                    color={THEME_COLORS.primary}
+                    color={colors.primary.main}
                   />
                 </View>
                 <View style={styles.benefitContent}>
@@ -185,7 +180,7 @@ export const VerificationSettingsScreen: React.FC = () => {
                   <MaterialCommunityIcons
                     name="account-group-outline"
                     size={24}
-                    color={THEME_COLORS.primary}
+                    color={colors.primary.main}
                   />
                 </View>
                 <View style={styles.benefitContent}>
@@ -208,7 +203,7 @@ export const VerificationSettingsScreen: React.FC = () => {
               onPress={handleStartVerification}
               activeOpacity={0.9}
             >
-              <MaterialCommunityIcons name="shield-check-outline" size={20} color="#FFF" />
+              <MaterialCommunityIcons name="shield-check-outline" size={20} color={colors.primary.contrast} />
               <Text style={styles.primaryButtonText}>
                 {status?.verification_status === 'rejected' ? '重新认证' : '开始认证'}
               </Text>
@@ -221,7 +216,7 @@ export const VerificationSettingsScreen: React.FC = () => {
               onPress={handleViewRecords}
               activeOpacity={0.8}
             >
-              <MaterialCommunityIcons name="file-document-outline" size={20} color={THEME_COLORS.primary} />
+              <MaterialCommunityIcons name="file-document-outline" size={20} color={colors.primary.main} />
               <Text style={styles.secondaryButtonText}>查看认证记录</Text>
             </TouchableOpacity>
           )}
@@ -262,6 +257,7 @@ export const VerificationSettingsScreen: React.FC = () => {
           </Text>
         </View>
       </ScrollView>
+    </SafeAreaView>
   );
 };
 
@@ -269,7 +265,7 @@ function createStyles(colors: AppColors) {
   return StyleSheet.create({
     container: {
       flex: 1,
-      backgroundColor: '#fff',
+      backgroundColor: colors.background.paper,
     },
     loadingContainer: {
       flex: 1,
@@ -307,7 +303,7 @@ function createStyles(colors: AppColors) {
       alignItems: 'center',
       paddingVertical: 32,
       paddingHorizontal: 24,
-      backgroundColor: '#F9F9F9',
+      backgroundColor: colors.background.default,
       borderRadius: 16,
       marginBottom: 24,
     },
@@ -334,7 +330,7 @@ function createStyles(colors: AppColors) {
     identityBadge: {
       flexDirection: 'row',
       alignItems: 'center',
-      backgroundColor: '#FFF5F0',
+      backgroundColor: colors.primary.main + '15',
       borderRadius: 20,
       paddingVertical: 8,
       paddingHorizontal: 16,
@@ -343,25 +339,25 @@ function createStyles(colors: AppColors) {
     identityText: {
       fontSize: 14,
       fontWeight: '600',
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
       marginLeft: 6,
     },
     rejectReasonContainer: {
       marginTop: 16,
       padding: 12,
-      backgroundColor: '#FFF3F3',
+      backgroundColor: colors.error.light + '20',
       borderRadius: 8,
       width: '100%',
     },
     rejectReasonLabel: {
       fontSize: 13,
       fontWeight: '600',
-      color: '#F44336',
+      color: colors.error.main,
       marginBottom: 4,
     },
     rejectReasonText: {
       fontSize: 13,
-      color: '#D32F2F',
+      color: colors.error.dark,
       lineHeight: 18,
     },
     benefitsSection: {
@@ -379,7 +375,7 @@ function createStyles(colors: AppColors) {
     benefitItem: {
       flexDirection: 'row',
       alignItems: 'flex-start',
-      backgroundColor: '#F9F9F9',
+      backgroundColor: colors.background.default,
       borderRadius: 12,
       padding: 16,
     },
@@ -387,7 +383,7 @@ function createStyles(colors: AppColors) {
       width: 48,
       height: 48,
       borderRadius: 12,
-      backgroundColor: '#FFF5F0',
+      backgroundColor: colors.primary.main + '15',
       justifyContent: 'center',
       alignItems: 'center',
       marginRight: 12,
@@ -415,12 +411,12 @@ function createStyles(colors: AppColors) {
       justifyContent: 'center',
       height: 56,
       borderRadius: 14,
-      backgroundColor: THEME_COLORS.primary,
+      backgroundColor: colors.primary.main,
     },
     primaryButtonText: {
       fontSize: 17,
       fontWeight: '600',
-      color: '#FFF',
+      color: colors.text.inverse,
       marginLeft: 8,
     },
     secondaryButton: {
@@ -429,18 +425,18 @@ function createStyles(colors: AppColors) {
       justifyContent: 'center',
       height: 56,
       borderRadius: 14,
-      backgroundColor: '#FFF5F0',
+      backgroundColor: colors.primary.main + '15',
       borderWidth: 1,
-      borderColor: THEME_COLORS.primary,
+      borderColor: colors.primary.main,
     },
     secondaryButtonText: {
       fontSize: 17,
       fontWeight: '600',
-      color: THEME_COLORS.primary,
+      color: colors.primary.main,
       marginLeft: 8,
     },
     verifiedInfo: {
-      backgroundColor: '#F9F9F9',
+      backgroundColor: colors.background.default,
       borderRadius: 12,
       padding: 16,
     },
diff --git a/src/services/BackgroundSyncManager.ts b/src/services/BackgroundSyncManager.ts
new file mode 100644
index 0000000..c97823f
--- /dev/null
+++ b/src/services/BackgroundSyncManager.ts
@@ -0,0 +1,284 @@
+/**
+ * 后台同步管理器
+ * 
+ * 整合前台服务、后台同步、消息状态管理
+ * 参考 Element Android 的 BackgroundSyncStarter 设计
+ */
+
+import { AppState, AppStateStatus, Platform } from 'react-native';
+import { ForegroundServiceModule } from './ForegroundServiceModule';
+import { wsService } from './wsService';
+import AsyncStorage from '@react-native-async-storage/async-storage';
+
+/**
+ * 后台同步模式
+ */
+export enum BackgroundSyncMode {
+  /** 省电模式：使用 expo-background-task（最小15分钟间隔） */
+  BATTERY_SAVER = 'battery_saver',
+  
+  /** 实时模式：前台服务保活 + 持续同步 */
+  REALTIME = 'realtime',
+  
+  /** 禁用后台同步 */
+  DISABLED = 'disabled',
+}
+
+const STORAGE_KEY = 'background_sync_mode';
+const SYNC_INTERVAL_MS = 30 * 1000; // 30 秒同步间隔
+
+class BackgroundSyncManager {
+  private mode: BackgroundSyncMode = BackgroundSyncMode.BATTERY_SAVER;
+  private appStateSubscription: ReturnType<typeof AppState.addEventListener> | null = null;
+  private syncInterval: ReturnType<typeof setInterval> | null = null;
+  private isInitialized: boolean = false;
+  private lastSyncAt: number = 0;
+  private syncMessagesCallback: (() => Promise<void>) | null = null;
+
+  /**
+   * 设置消息同步回调函数
+   * 由外部注入，避免循环依赖
+   */
+  setSyncMessagesCallback(callback: () => Promise<void>): void {
+    this.syncMessagesCallback = callback;
+  }
+
+  /**
+   * 初始化后台同步
+   */
+  async initialize(): Promise<void> {
+    if (this.isInitialized) return;
+
+    // 加载保存的模式
+    const savedMode = await this.loadMode();
+    this.mode = savedMode;
+
+    // 监听 AppState 变化
+    this.appStateSubscription = AppState.addEventListener(
+      'change',
+      this.handleAppStateChange
+    );
+
+    // 监听 WebSocket 断开
+    this.setupWSDisconnectListener();
+
+    this.isInitialized = true;
+    console.log('[BackgroundSyncManager] 初始化完成, 模式:', this.mode);
+  }
+
+  /**
+   * 切换后台同步模式
+   */
+  async setMode(mode: BackgroundSyncMode): Promise<void> {
+    // 如果当前在后台，先停止旧模式的保活
+    if (AppState.currentState !== 'active') {
+      this.stopPeriodicSync();
+      if (this.mode === BackgroundSyncMode.REALTIME) {
+        await ForegroundServiceModule.stop();
+      }
+    }
+
+    // 更新模式
+    this.mode = mode;
+    await this.saveMode(mode);
+
+    // 根据新模式立即执行相应操作
+    if (mode === BackgroundSyncMode.REALTIME) {
+      // 切换到实时模式：立即启动前台服务（无论前台还是后台）
+      const started = await ForegroundServiceModule.start({
+        title: '萝卜社区',
+        body: '正在后台同步消息',
+      });
+      if (started) {
+        this.startPeriodicSync();
+      }
+    } else {
+      // 切换到其他模式：立即停止前台服务和定时同步
+      this.stopPeriodicSync();
+      await ForegroundServiceModule.stop();
+    }
+
+    console.log('[BackgroundSyncManager] 模式已切换为:', mode);
+  }
+
+  /**
+   * 获取当前模式
+   */
+  getMode(): BackgroundSyncMode {
+    return this.mode;
+  }
+
+  /**
+   * AppState 变化处理
+   */
+  private handleAppStateChange = async (nextState: AppStateStatus) => {
+    console.log('[BackgroundSyncManager] AppState 变化:', nextState);
+
+    if (nextState === 'background' || nextState === 'inactive') {
+      // 进入后台
+      await this.startForBackground();
+    } else if (nextState === 'active') {
+      // 回到前台
+      await this.stopForForeground();
+    }
+  };
+
+  /**
+   * 进入后台时的处理
+   */
+  private async startForBackground(): Promise<void> {
+    if (this.mode === BackgroundSyncMode.DISABLED) return;
+
+    console.log('[BackgroundSyncManager] 进入后台');
+
+    if (this.mode === BackgroundSyncMode.REALTIME) {
+      // 确保前台服务正在运行
+      await ForegroundServiceModule.start({
+        title: '萝卜社区',
+        body: '正在后台同步消息',
+      });
+
+      // 启动定时同步
+      this.startPeriodicSync();
+    }
+  }
+
+  /**
+   * 回到前台时的处理
+   */
+  private async stopForForeground(): Promise<void> {
+    console.log('[BackgroundSyncManager] 回到前台');
+
+    // 停止定时同步（前台通过 WebSocket 实时同步，不需要轮询）
+    this.stopPeriodicSync();
+
+    // 实时模式下：前台服务保持运行，只更新通知文字
+    if (this.mode === BackgroundSyncMode.REALTIME) {
+      await ForegroundServiceModule.update('萝卜社区', '正在后台同步消息');
+    }
+
+    // 立即同步一次（获取离线消息）
+    await this.syncMessages();
+  }
+
+  /**
+   * 启动定时同步
+   */
+  private startPeriodicSync(): void {
+    this.stopPeriodicSync();
+
+    // 立即同步一次
+    this.syncMessages();
+
+    // 启动定时器
+    this.syncInterval = setInterval(() => {
+      this.syncMessages();
+    }, SYNC_INTERVAL_MS);
+
+    console.log('[BackgroundSyncManager] 定时同步已启动');
+  }
+
+  /**
+   * 停止定时同步
+   */
+  private stopPeriodicSync(): void {
+    if (this.syncInterval) {
+      clearInterval(this.syncInterval);
+      this.syncInterval = null;
+      console.log('[BackgroundSyncManager] 定时同步已停止');
+    }
+  }
+
+  /**
+   * 设置 WebSocket 断开监听
+   */
+  private setupWSDisconnectListener(): void {
+    // 监听 WebSocket 断开事件
+    wsService.onDisconnect(() => {
+      if (AppState.currentState !== 'active' && this.mode === BackgroundSyncMode.REALTIME) {
+        console.log('[BackgroundSyncManager] WebSocket 断开，尝试重连');
+        wsService.connect().catch((e) => {
+          console.error('[BackgroundSyncManager] WebSocket 重连失败:', e);
+        });
+      }
+    });
+  }
+
+  /**
+   * 执行消息同步
+   */
+  async syncMessages(): Promise<void> {
+    const now = Date.now();
+
+    // 防止短时间内重复同步（最小 10 秒间隔）
+    if (now - this.lastSyncAt < 10000) {
+      return;
+    }
+
+    this.lastSyncAt = now;
+
+    // 调用外部注入的同步回调
+    if (this.syncMessagesCallback) {
+      try {
+        await this.syncMessagesCallback();
+      } catch (error) {
+        console.error('[BackgroundSyncManager] 同步失败:', error);
+      }
+    }
+  }
+
+  /**
+   * 更新前台服务通知内容
+   */
+  async updateNotification(totalUnread: number): Promise<void> {
+    if (this.mode !== BackgroundSyncMode.REALTIME) return;
+
+    if (totalUnread > 0) {
+      await ForegroundServiceModule.update(
+        '萝卜社区',
+        `您有 ${totalUnread} 条未读消息`
+      );
+    } else {
+      await ForegroundServiceModule.update(
+        '萝卜社区',
+        '正在后台同步消息'
+      );
+    }
+  }
+
+  /**
+   * 保存模式到存储
+   */
+  private async saveMode(mode: BackgroundSyncMode): Promise<void> {
+    try {
+      await AsyncStorage.setItem(STORAGE_KEY, mode);
+    } catch (error) {
+      console.error('[BackgroundSyncManager] 保存模式失败:', error);
+    }
+  }
+
+  /**
+   * 从存储加载模式
+   */
+  private async loadMode(): Promise<BackgroundSyncMode> {
+    try {
+      const saved = await AsyncStorage.getItem(STORAGE_KEY);
+      return (saved as BackgroundSyncMode) || BackgroundSyncMode.BATTERY_SAVER;
+    } catch (error) {
+      return BackgroundSyncMode.BATTERY_SAVER;
+    }
+  }
+
+  /**
+   * 清理资源
+   */
+  async cleanup(): Promise<void> {
+    this.stopPeriodicSync();
+    this.appStateSubscription?.remove();
+    this.appStateSubscription = null;
+    await ForegroundServiceModule.stop();
+    this.isInitialized = false;
+  }
+}
+
+export const backgroundSyncManager = new BackgroundSyncManager();
diff --git a/src/services/ForegroundServiceModule.ts b/src/services/ForegroundServiceModule.ts
new file mode 100644
index 0000000..3bb3a9f
--- /dev/null
+++ b/src/services/ForegroundServiceModule.ts
@@ -0,0 +1,102 @@
+/**
+ * 前台服务模块
+ * 
+ * 提供 React Native 层对 Android 前台服务的控制接口
+ * 仅 Android 平台有效
+ */
+
+import { NativeModules, Platform } from 'react-native';
+
+const { ForegroundService } = NativeModules;
+
+export interface ForegroundServiceOptions {
+  title?: string;
+  body?: string;
+}
+
+/**
+ * 前台服务管理器
+ * 
+ * 使用方式：
+ * - 前台服务启动后，会在通知栏显示一个常驻通知
+ * - 服务会防止应用进程被系统杀死
+ * - 类似 V2Ray 和 Element Android 的保活机制
+ */
+export const ForegroundServiceModule = {
+  /**
+   * 启动前台服务
+   * @param options 通知配置
+   */
+  async start(options: ForegroundServiceOptions = {}): Promise<boolean> {
+    if (Platform.OS !== 'android') {
+      console.log('[ForegroundService] iOS 不支持前台服务保活');
+      return false;
+    }
+
+    if (!ForegroundService) {
+      console.error('[ForegroundService] 原生模块未注册');
+      return false;
+    }
+
+    try {
+      const result = await ForegroundService.start(
+        options.title || '萝卜社区',
+        options.body || '正在后台同步消息'
+      );
+      console.log('[ForegroundService] 服务已启动');
+      return result;
+    } catch (error) {
+      console.error('[ForegroundService] 启动失败:', error);
+      return false;
+    }
+  },
+
+  /**
+   * 停止前台服务
+   */
+  async stop(): Promise<boolean> {
+    if (Platform.OS !== 'android') {
+      return false;
+    }
+
+    if (!ForegroundService) {
+      return false;
+    }
+
+    try {
+      const result = await ForegroundService.stop();
+      console.log('[ForegroundService] 服务已停止');
+      return result;
+    } catch (error) {
+      console.error('[ForegroundService] 停止失败:', error);
+      return false;
+    }
+  },
+
+  /**
+   * 更新通知内容
+   */
+  async update(title: string, body: string): Promise<boolean> {
+    if (Platform.OS !== 'android') {
+      return false;
+    }
+
+    if (!ForegroundService) {
+      return false;
+    }
+
+    try {
+      return await ForegroundService.update(title, body);
+    } catch (error) {
+      console.error('[ForegroundService] 更新失败:', error);
+      return false;
+    }
+  },
+
+  /**
+   * 检查是否为 Android 平台
+   */
+  isSupported(): boolean {
+    return Platform.OS === 'android' && !!ForegroundService;
+  },
+};
diff --git a/src/services/backgroundService.ts b/src/services/backgroundService.ts
index 53f9575..d7da22e 100644
--- a/src/services/backgroundService.ts
+++ b/src/services/backgroundService.ts
@@ -1,107 +1,92 @@
 /**
  * 后台保活服务
- * 使用 expo-background-fetch 和 expo-task-manager 实现 App 后台保活
  * 
- * 功能：
- * - 定期后台任务保持 App 在内存中
- * - 配合 SSE 服务保持长连接
- * - 收到消息时触发震动提示
+ * 整合前台服务和后台同步
+ * - REALTIME 模式：使用 Android 前台服务保活（通知栏常驻）
+ * - BATTERY_SAVER 模式：使用 expo-background-task 定期同步（最小15分钟间隔）
+ * 
+ * 参考：Element Android 的 GuardAndroidService + BackgroundSyncStarter
  */
 
-import { AppState, AppStateStatus, Platform } from 'react-native';
-import * as BackgroundFetch from 'expo-background-fetch';
+import { Platform } from 'react-native';
+import * as BackgroundTask from 'expo-background-task';
 import * as TaskManager from 'expo-task-manager';
-import { wsService } from './wsService';
 import {
-  triggerVibration,
-  vibrateOnMessage,
-  setVibrationConfig,
-  getVibrationConfig,
-  setVibrationEnabled,
-} from './messageVibrationService';
-export { triggerVibration, vibrateOnMessage, setVibrationConfig, getVibrationConfig, setVibrationEnabled };
-
-// 后台任务名称
-const BACKGROUND_FETCH_TASK = 'background-fetch-keepalive';
-const REALTIME_KEEPALIVE_TASK = 'realtime-keepalive';
-
-// 后台任务间隔（Android 最小 15 分钟，iOS 最小 15 分钟）
-const BACKGROUND_INTERVAL = 15; // 15 分钟
-
-// 后台服务状态
-let isInitialized = false;
-let appStateSubscription: any = null;
-
-// 导入 api 用于检查认证状态
+  backgroundSyncManager,
+  BackgroundSyncMode,
+} from './BackgroundSyncManager';
+import { messageService } from './messageService';
 import { api } from './api';
 
-// 定义后台任务
-TaskManager.defineTask(BACKGROUND_FETCH_TASK, async () => {
+// 后台任务名称
+const BACKGROUND_SYNC_TASK = 'background-sync-task';
+
+// 后台任务间隔（分钟）
+const BACKGROUND_INTERVAL_MINUTES = 15;
+
+// 服务状态
+let isInitialized = false;
+
+// 定义后台任务（使用 expo-background-task）
+TaskManager.defineTask(BACKGROUND_SYNC_TASK, async () => {
   try {
     // 检查是否已认证
     const token = await api.getToken();
     if (!token) {
-      return BackgroundFetch.BackgroundFetchResult.NoData;
+      return BackgroundTask.BackgroundTaskResult.Success;
     }
-    
-    // 检查 SSE 连接状态
-    if (!wsService.isConnected()) {
-      await wsService.connect();
-    }
-    
-    // 返回收到新数据
-    return BackgroundFetch.BackgroundFetchResult.NewData;
+
+    // 执行同步
+    await syncMessages();
+
+    return BackgroundTask.BackgroundTaskResult.Success;
   } catch (error) {
     console.error('[BackgroundService] 后台任务执行失败:', error);
-    return BackgroundFetch.BackgroundFetchResult.Failed;
-  }
-});
-
-// SSE 保活任务
-TaskManager.defineTask(REALTIME_KEEPALIVE_TASK, async () => {
-  try {
-    // 检查是否已认证
-    const token = await api.getToken();
-    if (!token) {
-      return BackgroundFetch.BackgroundFetchResult.NoData;
-    }
-    
-    if (!wsService.isConnected()) {
-      await wsService.connect();
-    }
-    return BackgroundFetch.BackgroundFetchResult.NewData;
-  } catch (error) {
-    console.error('[BackgroundService] SSE 保活失败:', error);
-    return BackgroundFetch.BackgroundFetchResult.Failed;
+    return BackgroundTask.BackgroundTaskResult.Failed;
   }
 });
 
 /**
- * 注册后台任务
+ * 执行消息同步
  */
-async function registerBackgroundTasks(): Promise<void> {
+async function syncMessages(): Promise<void> {
+  try {
+    // 同步未读数
+    const unreadData = await messageService.getUnreadCount();
+    const totalUnread = unreadData?.total_unread_count ?? 0;
+
+    // 更新前台服务通知
+    await backgroundSyncManager.updateNotification(totalUnread);
+
+    console.log('[BackgroundService] 同步完成, 未读数:', totalUnread);
+  } catch (error) {
+    console.error('[BackgroundService] 同步失败:', error);
+  }
+}
+
+/**
+ * 注册后台任务（expo-background-task）
+ */
+async function registerBackgroundTask(): Promise<void> {
   if (Platform.OS === 'web') {
     return;
   }
+
   try {
-    // 检查是否已注册
-    const isRegistered = await TaskManager.isTaskRegisteredAsync(BACKGROUND_FETCH_TASK);
-    if (!isRegistered) {
-      await BackgroundFetch.registerTaskAsync(BACKGROUND_FETCH_TASK, {
-        minimumInterval: BACKGROUND_INTERVAL * 60, // 转换为秒
-        stopOnTerminate: false, // App 终止后继续运行
-        startOnBoot: true, // 设备启动后自动运行
-      });
+    // 检查后台任务状态
+    const status = await BackgroundTask.getStatusAsync();
+    if (status !== BackgroundTask.BackgroundTaskStatus.Available) {
+      console.warn('[BackgroundService] 后台任务不可用，状态:', status);
+      return;
     }
 
-    // 注册 SSE 保活任务
-    const isSseKeepaliveRegistered = await TaskManager.isTaskRegisteredAsync(REALTIME_KEEPALIVE_TASK);
-    if (!isSseKeepaliveRegistered) {
-      await BackgroundFetch.registerTaskAsync(REALTIME_KEEPALIVE_TASK, {
-        minimumInterval: 60, // 1 分钟检查一次
-        stopOnTerminate: false,
-        startOnBoot: true,
+    // 检查是否已注册
+    const isRegistered = await TaskManager.isTaskRegisteredAsync(BACKGROUND_SYNC_TASK);
+    if (!isRegistered) {
+      await BackgroundTask.registerTaskAsync(BACKGROUND_SYNC_TASK, {
+        minimumInterval: BACKGROUND_INTERVAL_MINUTES, // 以分钟为单位
       });
+      console.log('[BackgroundService] 后台任务已注册');
     }
   } catch (error) {
     console.error('[BackgroundService] 注册后台任务失败:', error);
@@ -111,41 +96,22 @@ async function registerBackgroundTasks(): Promise<void> {
 /**
  * 取消后台任务
  */
-async function unregisterBackgroundTasks(): Promise<void> {
+async function unregisterBackgroundTask(): Promise<void> {
   if (Platform.OS === 'web') {
     return;
   }
+
   try {
-    await BackgroundFetch.unregisterTaskAsync(BACKGROUND_FETCH_TASK);
-    await BackgroundFetch.unregisterTaskAsync(REALTIME_KEEPALIVE_TASK);
+    const isRegistered = await TaskManager.isTaskRegisteredAsync(BACKGROUND_SYNC_TASK);
+    if (isRegistered) {
+      await BackgroundTask.unregisterTaskAsync(BACKGROUND_SYNC_TASK);
+      console.log('[BackgroundService] 后台任务已取消');
+    }
   } catch (error) {
     console.error('[BackgroundService] 取消后台任务失败:', error);
   }
 }
 
-/**
- * 设置 App 状态监听
- */
-function setupAppStateListener(): void {
-  if (appStateSubscription) {
-    return;
-  }
-
-  appStateSubscription = AppState.addEventListener('change', async (nextAppState: AppStateStatus) => {
-    if (nextAppState === 'active') {
-      // 检查是否已认证
-      const token = await api.getToken();
-      if (!token) {
-        return;
-      }
-      // App 回到前台，确保连接
-      if (!wsService.isConnected()) {
-        wsService.connect();
-      }
-    }
-  });
-}
-
 /**
  * 初始化后台保活服务
  */
@@ -155,26 +121,22 @@ export async function initBackgroundService(): Promise<boolean> {
   }
 
   if (Platform.OS === 'web') {
-    setupAppStateListener();
     isInitialized = true;
     return true;
   }
 
   try {
-    // 检查后台任务状态
-    const status = await BackgroundFetch.getStatusAsync();
-    if (status !== BackgroundFetch.BackgroundFetchStatus.Available) {
-      console.warn('[BackgroundService] 后台任务不可用，状态:', status);
-      // 即使后台任务不可用，也继续初始化其他功能
-    }
+    // 设置同步回调
+    backgroundSyncManager.setSyncMessagesCallback(syncMessages);
 
-    // 注册后台任务
-    await registerBackgroundTasks();
+    // 初始化后台同步管理器
+    await backgroundSyncManager.initialize();
 
-    // 设置 App 状态监听
-    setupAppStateListener();
+    // 注册 expo-background-task 任务（用于 BATTERY_SAVER 模式）
+    await registerBackgroundTask();
 
     isInitialized = true;
+    console.log('[BackgroundService] 初始化完成');
     return true;
   } catch (error) {
     console.error('[BackgroundService] 初始化失败:', error);
@@ -187,14 +149,10 @@ export async function initBackgroundService(): Promise<boolean> {
  */
 export async function stopBackgroundService(): Promise<void> {
   try {
-    await unregisterBackgroundTasks();
-    
-    if (appStateSubscription) {
-      appStateSubscription.remove();
-      appStateSubscription = null;
-    }
-
+    await unregisterBackgroundTask();
+    await backgroundSyncManager.cleanup();
     isInitialized = false;
+    console.log('[BackgroundService] 服务已停止');
   } catch (error) {
     console.error('[BackgroundService] 停止服务失败:', error);
   }
@@ -207,34 +165,74 @@ export async function checkBackgroundStatus(): Promise<{
   isAvailable: boolean;
   isInitialized: boolean;
   registeredTasks: string[];
+  mode: BackgroundSyncMode;
 }> {
   if (Platform.OS === 'web') {
     return {
       isAvailable: false,
       isInitialized,
       registeredTasks: [],
+      mode: backgroundSyncManager.getMode(),
     };
   }
-  const status = await BackgroundFetch.getStatusAsync();
+
+  const status = await BackgroundTask.getStatusAsync();
   const registeredTasks = await TaskManager.getRegisteredTasksAsync();
 
   return {
-    isAvailable: status === BackgroundFetch.BackgroundFetchStatus.Available,
+    isAvailable: status === BackgroundTask.BackgroundTaskStatus.Available,
     isInitialized,
-    registeredTasks: registeredTasks.map(task => task.taskName),
+    registeredTasks: registeredTasks.map((task) => task.taskName),
+    mode: backgroundSyncManager.getMode(),
   };
 }
 
-// 导出服务实例
-export const backgroundService = {
-  init: initBackgroundService,
-  stop: stopBackgroundService,
-  vibrate: triggerVibration,
+/**
+ * 设置后台同步模式
+ */
+export async function setBackgroundSyncMode(mode: BackgroundSyncMode): Promise<void> {
+  await backgroundSyncManager.setMode(mode);
+}
+
+/**
+ * 获取当前后台同步模式
+ */
+export function getBackgroundSyncMode(): BackgroundSyncMode {
+  return backgroundSyncManager.getMode();
+}
+
+/**
+ * 手动触发同步
+ */
+export async function syncNow(): Promise<void> {
+  await syncMessages();
+}
+
+// 导出震动相关功能（保持向后兼容）
+export {
+  triggerVibration,
   vibrateOnMessage,
   setVibrationConfig,
   getVibrationConfig,
   setVibrationEnabled,
+} from './messageVibrationService';
+
+// 重新导出类型
+export { BackgroundSyncMode };
+
+// 后台服务实例
+export const backgroundService = {
+  init: initBackgroundService,
+  stop: stopBackgroundService,
+  setMode: setBackgroundSyncMode,
+  getMode: getBackgroundSyncMode,
+  syncNow,
   checkStatus: checkBackgroundStatus,
+  // 震动相关
+  vibrate: async () => {
+    const { triggerVibration } = await import('./messageVibrationService');
+    triggerVibration();
+  },
 };
 
 export default backgroundService;