diff --git a/CustomKeyboard/KeyboardViewController.m b/CustomKeyboard/KeyboardViewController.m
index 3d880ef..e55c7c2 100644
--- a/CustomKeyboard/KeyboardViewController.m
+++ b/CustomKeyboard/KeyboardViewController.m
@@ -31,8 +31,10 @@
 
 // 以 375 宽设计稿为基准的键盘总高度
 static const CGFloat kKBKeyboardBaseHeight = 250.0f;
-static NSString * const kKBDefaultSkinId = @"normal_them";
-static NSString * const kKBDefaultSkinZipName = @"normal_them";
+static NSString * const kKBDefaultSkinIdLight = @"normal_them";
+static NSString * const kKBDefaultSkinZipNameLight = @"normal_them";
+static NSString * const kKBDefaultSkinIdDark = @"normal_hei_them";
+static NSString * const kKBDefaultSkinZipNameDark = @"normal_hei_them";
 
 static void KBSkinInstallNotificationCallback(CFNotificationCenterRef center,
                                               void *observer,
@@ -120,6 +122,15 @@ static void KBSkinInstallNotificationCallback(CFNotificationCenterRef center,
     [[KBBackspaceUndoManager shared] registerNonClearAction];
 }
 
+- (void)traitCollectionDidChange:(UITraitCollection *)previousTraitCollection {
+    [super traitCollectionDidChange:previousTraitCollection];
+    if (@available(iOS 13.0, *)) {
+        if (previousTraitCollection.userInterfaceStyle != self.traitCollection.userInterfaceStyle) {
+            [self kb_applyDefaultSkinIfNeeded];
+        }
+    }
+}
+
 - (void)textDidChange:(id<UITextInput>)textInput {
     [super textDidChange:textInput];
     [[KBInputBufferManager shared] updateFromExternalContextBefore:self.textDocumentProxy.documentContextBeforeInput
@@ -771,7 +782,25 @@ static void KBSkinInstallNotificationCallback(CFNotificationCenterRef center,
     if (skinId.length == 0 || [skinId isEqualToString:@"default"]) {
         return YES;
     }
-    return [skinId isEqualToString:kKBDefaultSkinId];
+    if ([skinId isEqualToString:kKBDefaultSkinIdLight]) {
+        return YES;
+    }
+    return [skinId isEqualToString:kKBDefaultSkinIdDark];
+}
+
+- (BOOL)kb_isDarkModeActive {
+    if (@available(iOS 13.0, *)) {
+        return self.traitCollection.userInterfaceStyle == UIUserInterfaceStyleDark;
+    }
+    return NO;
+}
+
+- (NSString *)kb_defaultSkinIdForCurrentStyle {
+    return [self kb_isDarkModeActive] ? kKBDefaultSkinIdDark : kKBDefaultSkinIdLight;
+}
+
+- (NSString *)kb_defaultSkinZipNameForCurrentStyle {
+    return [self kb_isDarkModeActive] ? kKBDefaultSkinZipNameDark : kKBDefaultSkinZipNameLight;
 }
 
 - (UIImage *)kb_defaultGradientImageWithSize:(CGSize)size {
@@ -858,21 +887,24 @@ static void KBSkinInstallNotificationCallback(CFNotificationCenterRef center,
 
     NSString *currentId = [KBSkinManager shared].current.skinId ?: @"";
     BOOL isDefault = (currentId.length == 0 || [currentId isEqualToString:@"default"]);
-    if (!isDefault && ![currentId isEqualToString:kKBDefaultSkinId]) {
-        return;
-    }
-    if ([currentId isEqualToString:kKBDefaultSkinId]) {
+    BOOL isLightDefault = [currentId isEqualToString:kKBDefaultSkinIdLight];
+    BOOL isDarkDefault = [currentId isEqualToString:kKBDefaultSkinIdDark];
+    if (!isDefault && !isLightDefault && !isDarkDefault) {
+        // 用户已应用自定义皮肤：不随深色模式切换默认皮肤
         return;
     }
+    NSString *targetId = [self kb_defaultSkinIdForCurrentStyle];
+    NSString *targetZip = [self kb_defaultSkinZipNameForCurrentStyle];
+    if (currentId.length > 0 && [currentId isEqualToString:targetId]) { return; }
 
     NSError *applyError = nil;
-    if ([KBSkinInstallBridge applyInstalledSkinWithId:kKBDefaultSkinId error:&applyError]) {
+    if ([KBSkinInstallBridge applyInstalledSkinWithId:targetId error:&applyError]) {
         return;
     }
 
-    [KBSkinInstallBridge publishBundleSkinRequestWithId:kKBDefaultSkinId
-                                                   name:kKBDefaultSkinId
-                                                zipName:kKBDefaultSkinZipName
+    [KBSkinInstallBridge publishBundleSkinRequestWithId:targetId
+                                                   name:targetId
+                                                zipName:targetZip
                                          iconShortNames:nil];
     [KBSkinInstallBridge consumePendingRequestFromBundle:NSBundle.mainBundle
                                               completion:^(__unused BOOL success, __unused NSError * _Nullable error) {