diff --git a/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt b/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
index 74e4038cb..17131088e 100644
--- a/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/book/read/ReadBookViewModel.kt
@@ -2587,6 +2587,8 @@ class ReadBookViewModel(
             else -> "0" // dark → follow system
         }
         ThemeConfig.themeMode = nextMode
+        // 同步更新 AppConfig 缓存，确保 View 层 ReadStyleResolver 立即读到新值
+        AppConfig.themeMode = nextMode
         _uiState.update { it.copy(styleConfig = buildStyleConfig()) }
         _effects.tryEmit(ReadBookEffect.UpdateReadViewConfig(
             setOf(