diff --git a/app/src/main/java/top/yeij/cyrene/MainActivity.kt b/app/src/main/java/top/yeij/cyrene/MainActivity.kt
index e73feda..2e11bd4 100644
--- a/app/src/main/java/top/yeij/cyrene/MainActivity.kt
+++ b/app/src/main/java/top/yeij/cyrene/MainActivity.kt
@@ -7,8 +7,13 @@ import android.provider.Settings
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
 import androidx.activity.enableEdgeToEdge
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.navigation.compose.rememberNavController
+import org.koin.compose.koinInject
+import top.yeij.cyrene.data.local.PreferencesDataStore
 import top.yeij.cyrene.service.CyreneVoiceInteractionService
 import top.yeij.cyrene.ui.navigation.CyreneNavGraph
 import top.yeij.cyrene.ui.navigation.Routes
@@ -26,7 +31,15 @@ class MainActivity : ComponentActivity() {
         isDefaultAssistant.value = checkIsDefaultAssistant()
 
         setContent {
-            CyreneTheme {
+            val prefs: PreferencesDataStore = koinInject()
+            val themeMode by prefs.themeMode.collectAsState(initial = null)
+            val darkTheme = when (themeMode) {
+                "light" -> false
+                "dark" -> true
+                else -> isSystemInDarkTheme()
+            }
+
+            CyreneTheme(darkTheme = darkTheme) {
                 val navController = rememberNavController()
 
                 CyreneNavGraph(
diff --git a/app/src/main/java/top/yeij/cyrene/data/local/PreferencesDataStore.kt b/app/src/main/java/top/yeij/cyrene/data/local/PreferencesDataStore.kt
index 314955c..e44c443 100644
--- a/app/src/main/java/top/yeij/cyrene/data/local/PreferencesDataStore.kt
+++ b/app/src/main/java/top/yeij/cyrene/data/local/PreferencesDataStore.kt
@@ -3,6 +3,7 @@ package top.yeij.cyrene.data.local
 import android.content.Context
 import androidx.datastore.core.DataStore
 import androidx.datastore.preferences.core.Preferences
+import androidx.datastore.preferences.core.booleanPreferencesKey
 import androidx.datastore.preferences.core.edit
 import androidx.datastore.preferences.core.stringPreferencesKey
 import androidx.datastore.preferences.preferencesDataStore
@@ -31,6 +32,7 @@ class PreferencesDataStore(private val context: Context) {
         private val KEY_PROFILE_NICKNAME = stringPreferencesKey("profile_nickname")
         private val KEY_PROFILE_IS_ADMIN = stringPreferencesKey("profile_is_admin")
         private val KEY_PROFILE_CREATED_AT = stringPreferencesKey("profile_created_at")
+        private val KEY_AUTO_SCREEN_CONTEXT = booleanPreferencesKey("auto_screen_context")
     }
 
     val token: Flow<String?> = context.dataStore.data.map { it[KEY_TOKEN] }
@@ -115,6 +117,12 @@ class PreferencesDataStore(private val context: Context) {
         }
     }
 
+    val autoScreenContext: Flow<Boolean> = context.dataStore.data.map { it[KEY_AUTO_SCREEN_CONTEXT] ?: false }
+
+    suspend fun saveAutoScreenContext(enabled: Boolean) {
+        context.dataStore.edit { it[KEY_AUTO_SCREEN_CONTEXT] = enabled }
+    }
+
     suspend fun clearProfileCache() {
         context.dataStore.edit {
             it.remove(KEY_PROFILE_USER_ID)
diff --git a/app/src/main/java/top/yeij/cyrene/service/CyreneVoiceInteractionSession.kt b/app/src/main/java/top/yeij/cyrene/service/CyreneVoiceInteractionSession.kt
index 52c51b7..e33f26b 100644
--- a/app/src/main/java/top/yeij/cyrene/service/CyreneVoiceInteractionSession.kt
+++ b/app/src/main/java/top/yeij/cyrene/service/CyreneVoiceInteractionSession.kt
@@ -16,8 +16,11 @@ import androidx.savedstate.SavedStateRegistry
 import androidx.savedstate.SavedStateRegistryController
 import androidx.savedstate.SavedStateRegistryOwner
 import androidx.savedstate.setViewTreeSavedStateRegistryOwner
+import kotlinx.coroutines.flow.firstOrNull
+import kotlinx.coroutines.runBlocking
 import org.koin.core.context.GlobalContext
 import top.yeij.cyrene.MainActivity
+import top.yeij.cyrene.data.local.PreferencesDataStore
 import top.yeij.cyrene.ui.overlay.OverlayContent
 import top.yeij.cyrene.ui.theme.CyreneTheme
 import top.yeij.cyrene.util.Constants
@@ -92,10 +95,19 @@ class CyreneVoiceInteractionSession(context: Context) :
         // Configure window: extend behind status bar, don't resize for IME
         configureWindow()
 
-        val screenContent = CyreneAccessibilityService.getScreenContent()
-        if (screenContent.isNotBlank()) {
-            overlayViewModel?.sendScreenContext(screenContent)
-            RuntimeLog.general("overlay", "Screen context sent, len=${screenContent.length}")
+        // Only read screen content if user enabled it in settings (default off)
+        val autoScreenContext = try {
+            val prefs: PreferencesDataStore = GlobalContext.get().get()
+            runBlocking { prefs.autoScreenContext.firstOrNull() } ?: false
+        } catch (_: Exception) {
+            false
+        }
+        if (autoScreenContext) {
+            val screenContent = CyreneAccessibilityService.getScreenContent()
+            if (screenContent.isNotBlank()) {
+                overlayViewModel?.sendScreenContext(screenContent)
+                RuntimeLog.general("overlay", "Screen context sent, len=${screenContent.length}")
+            }
         }
     }
 
diff --git a/app/src/main/java/top/yeij/cyrene/ui/screens/settings/SettingsScreen.kt b/app/src/main/java/top/yeij/cyrene/ui/screens/settings/SettingsScreen.kt
index aef4fce..9c386b3 100644
--- a/app/src/main/java/top/yeij/cyrene/ui/screens/settings/SettingsScreen.kt
+++ b/app/src/main/java/top/yeij/cyrene/ui/screens/settings/SettingsScreen.kt
@@ -72,6 +72,7 @@ fun SettingsScreen(
     val dashScopeApiKey by viewModel.dashScopeApiKey.collectAsState()
     val dashScopeEndpoint by viewModel.dashScopeEndpoint.collectAsState()
     val dashScopeModel by viewModel.dashScopeModel.collectAsState()
+    val autoScreenContext by viewModel.autoScreenContext.collectAsState()
     val context = LocalContext.current
     val scope = rememberCoroutineScope()
 
@@ -224,6 +225,20 @@ fun SettingsScreen(
                 shape = MaterialTheme.shapes.medium,
             )
 
+            Spacer(modifier = Modifier.height(8.dp))
+
+            ListItem(
+                headlineContent = { Text("自动读取屏幕内容") },
+                supportingContent = { Text("电源键唤起助手时自动截取当前屏幕内容并加入对话上下文") },
+                trailingContent = {
+                    androidx.compose.material3.Switch(
+                        checked = autoScreenContext,
+                        onCheckedChange = { viewModel.saveAutoScreenContext(it) },
+                    )
+                },
+                modifier = Modifier.clickable { viewModel.saveAutoScreenContext(!autoScreenContext) },
+            )
+
             Spacer(modifier = Modifier.height(16.dp))
             HorizontalDivider()
             Spacer(modifier = Modifier.height(16.dp))
diff --git a/app/src/main/java/top/yeij/cyrene/ui/theme/Theme.kt b/app/src/main/java/top/yeij/cyrene/ui/theme/Theme.kt
index ea6b3bf..9b631a7 100644
--- a/app/src/main/java/top/yeij/cyrene/ui/theme/Theme.kt
+++ b/app/src/main/java/top/yeij/cyrene/ui/theme/Theme.kt
@@ -1,5 +1,6 @@
 package top.yeij.cyrene.ui.theme
 
+import android.app.Activity
 import android.os.Build
 import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.material3.MaterialTheme
@@ -8,7 +9,11 @@ import androidx.compose.material3.dynamicDarkColorScheme
 import androidx.compose.material3.dynamicLightColorScheme
 import androidx.compose.material3.lightColorScheme
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.SideEffect
+import androidx.compose.ui.graphics.toArgb
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalView
+import androidx.core.view.WindowCompat
 
 private val LightColorScheme = lightColorScheme(
     primary = LightPrimary,
@@ -73,6 +78,19 @@ fun CyreneTheme(
         else -> LightColorScheme
     }
 
+    val view = LocalView.current
+    if (!view.isInEditMode) {
+        SideEffect {
+            val window = (view.context as Activity).window
+            window.statusBarColor = colorScheme.background.toArgb()
+            window.navigationBarColor = colorScheme.background.toArgb()
+            WindowCompat.getInsetsController(window, view).apply {
+                isAppearanceLightStatusBars = !darkTheme
+                isAppearanceLightNavigationBars = !darkTheme
+            }
+        }
+    }
+
     MaterialTheme(
         colorScheme = colorScheme,
         typography = CyreneTypography,
diff --git a/app/src/main/java/top/yeij/cyrene/viewmodel/SettingsViewModel.kt b/app/src/main/java/top/yeij/cyrene/viewmodel/SettingsViewModel.kt
index bcab963..b76dacd 100644
--- a/app/src/main/java/top/yeij/cyrene/viewmodel/SettingsViewModel.kt
+++ b/app/src/main/java/top/yeij/cyrene/viewmodel/SettingsViewModel.kt
@@ -45,6 +45,9 @@ class SettingsViewModel(
     private val _dashScopeModel = MutableStateFlow("fun-asr-realtime")
     val dashScopeModel: StateFlow<String> = _dashScopeModel.asStateFlow()
 
+    private val _autoScreenContext = MutableStateFlow(false)
+    val autoScreenContext: StateFlow<Boolean> = _autoScreenContext.asStateFlow()
+
     private val _isLoggedIn = MutableStateFlow(false)
     val isLoggedIn: StateFlow<Boolean> = _isLoggedIn.asStateFlow()
 
@@ -53,6 +56,11 @@ class SettingsViewModel(
             _isLoggedIn.value = authRepository.isLoggedIn()
         }
         // Single collector for all DataStore preferences — avoids subscriber explosion
+        scope.launch {
+            preferencesDataStore.autoScreenContext.collect { value ->
+                _autoScreenContext.value = value
+            }
+        }
         scope.launch {
             combine(
                 preferencesDataStore.baseUrl,
@@ -152,6 +160,11 @@ class SettingsViewModel(
         scope.launch { preferencesDataStore.saveDashScopeModel(model) }
     }
 
+    fun saveAutoScreenContext(enabled: Boolean) {
+        _autoScreenContext.value = enabled
+        scope.launch { preferencesDataStore.saveAutoScreenContext(enabled) }
+    }
+
     fun clearLocalMessages() {
         scope.launch {
             chatRepository.clearLocalMessages()