diff --git a/CustomKeyboard/KeyboardViewController.m b/CustomKeyboard/KeyboardViewController.m
index 6156407..3d880ef 100644
--- a/CustomKeyboard/KeyboardViewController.m
+++ b/CustomKeyboard/KeyboardViewController.m
@@ -729,6 +729,20 @@ static void KBSkinInstallNotificationCallback(CFNotificationCenterRef center,
 - (void)kb_applyTheme {
     KBSkinTheme *t = [KBSkinManager shared].current;
     UIImage *img = [[KBSkinManager shared] currentBackgroundImage];
+    if ([self kb_isDefaultKeyboardTheme:t]) {
+        CGSize size = self.bgImageView.bounds.size;
+        if (size.width <= 0 || size.height <= 0) {
+            [self.view layoutIfNeeded];
+            size = self.bgImageView.bounds.size;
+        }
+        if (size.width <= 0 || size.height <= 0) {
+            size = self.view.bounds.size;
+        }
+        if (size.width <= 0 || size.height <= 0) {
+            size = [UIScreen mainScreen].bounds.size;
+        }
+        img = [self kb_defaultGradientImageWithSize:size];
+    }
     NSLog(@"⌨️[Keyboard] apply theme id=%@ hasBg=%d", t.skinId, (img != nil));
     [self kb_logSkinDiagnosticsWithTheme:t backgroundImage:img];
     self.bgImageView.image = img;
@@ -752,6 +766,32 @@ static void KBSkinInstallNotificationCallback(CFNotificationCenterRef center,
     }
 }
 
+- (BOOL)kb_isDefaultKeyboardTheme:(KBSkinTheme *)theme {
+    NSString *skinId = theme.skinId ?: @"";
+    if (skinId.length == 0 || [skinId isEqualToString:@"default"]) {
+        return YES;
+    }
+    return [skinId isEqualToString:kKBDefaultSkinId];
+}
+
+- (UIImage *)kb_defaultGradientImageWithSize:(CGSize)size {
+    if (size.width <= 0 || size.height <= 0) { return nil; }
+    CAGradientLayer *layer = [CAGradientLayer layer];
+    layer.frame = CGRectMake(0, 0, size.width, size.height);
+    layer.startPoint = CGPointMake(0.5, 0.0);
+    layer.endPoint = CGPointMake(0.5, 1.0);
+    layer.colors = @[
+        (id)[UIColor colorWithHex:0xDEDFE4].CGColor,
+        (id)[UIColor colorWithHex:0xD1D3DB].CGColor
+    ];
+
+    UIGraphicsBeginImageContextWithOptions(size, YES, 0);
+    [layer renderInContext:UIGraphicsGetCurrentContext()];
+    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
+    UIGraphicsEndImageContext();
+    return image;
+}
+
 - (void)kb_logSkinDiagnosticsWithTheme:(KBSkinTheme *)theme
                        backgroundImage:(UIImage *)image {
 #if DEBUG
diff --git a/CustomKeyboard/Resource/normal_them.zip b/CustomKeyboard/Resource/normal_them.zip
index b3635b1..9c2b941 100644
Binary files a/CustomKeyboard/Resource/normal_them.zip and b/CustomKeyboard/Resource/normal_them.zip differ
diff --git a/CustomKeyboard/View/KBKeyboardView.m b/CustomKeyboard/View/KBKeyboardView.m
index 06782f8..61c57fc 100644
--- a/CustomKeyboard/View/KBKeyboardView.m
+++ b/CustomKeyboard/View/KBKeyboardView.m
@@ -128,6 +128,46 @@ static const CGFloat kKBLettersRow2EdgeSpacerMultiplier = 0.5;
     [self buildRow:self.row4 withRowConfig:rows[3]];
 }
 
+#pragma mark - Hit Test
+
+- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
+    UIView *hit = [super hitTest:point withEvent:event];
+    if ([hit isKindOfClass:[KBKeyButton class]]) {
+        return hit;
+    }
+    if (hit == self || hit == self.row1 || hit == self.row2 || hit == self.row3 || hit == self.row4) {
+        KBKeyButton *btn = [self kb_nearestKeyButtonForPoint:point];
+        if (btn) { return btn; }
+    }
+    return hit;
+}
+
+- (KBKeyButton *)kb_nearestKeyButtonForPoint:(CGPoint)point {
+    // 扩大按键的可点击区域，优先响应间隙点击（贴近系统键盘手感）。
+    CGFloat slopX = KBFit(8.0f);
+    CGFloat slopY = KBFit(4.0f);
+    KBKeyButton *best = nil;
+    CGFloat bestDistance = CGFLOAT_MAX;
+    NSArray<UIView *> *rows = @[self.row1, self.row2, self.row3, self.row4];
+    for (UIView *row in rows) {
+        for (UIView *view in row.subviews) {
+            if (![view isKindOfClass:[KBKeyButton class]]) { continue; }
+            KBKeyButton *btn = (KBKeyButton *)view;
+            CGRect frame = [self convertRect:btn.frame fromView:row];
+            CGRect hitFrame = CGRectInset(frame, -slopX, -slopY);
+            if (!CGRectContainsPoint(hitFrame, point)) { continue; }
+            CGFloat dx = point.x - CGRectGetMidX(frame);
+            CGFloat dy = point.y - CGRectGetMidY(frame);
+            CGFloat dist = (dx * dx) + (dy * dy);
+            if (dist < bestDistance) {
+                bestDistance = dist;
+                best = btn;
+            }
+        }
+    }
+    return best;
+}
+
 #pragma mark - Key Model Construction
 
 // 创建当前布局下各行的 KBKey 列表
diff --git a/keyBoard.xcodeproj/project.pbxproj b/keyBoard.xcodeproj/project.pbxproj
index d9d7494..b1263ed 100644
--- a/keyBoard.xcodeproj/project.pbxproj
+++ b/keyBoard.xcodeproj/project.pbxproj
@@ -172,7 +172,7 @@
 		04C6EADD2EAF8CEB0089C901 /* KBToolBar.m in Sources */ = {isa = PBXBuildFile; fileRef = 04C6EADC2EAF8CEB0089C901 /* KBToolBar.m */; };
 		04D1F6B22EDFF10A00B12345 /* KBSkinInstallBridge.m in Sources */ = {isa = PBXBuildFile; fileRef = 04D1F6B12EDFF10A00B12345 /* KBSkinInstallBridge.m */; };
 		04D1F6B32EDFF10A00B12345 /* KBSkinInstallBridge.m in Sources */ = {isa = PBXBuildFile; fileRef = 04D1F6B12EDFF10A00B12345 /* KBSkinInstallBridge.m */; };
-		04E1617A2F0FB1320022C23B /* normal_them.zip in Resources */ = {isa = PBXBuildFile; fileRef = 04E161792F0FB1320022C23B /* normal_them.zip */; };
+		04E1617C2F0FCA050022C23B /* normal_them.zip in Resources */ = {isa = PBXBuildFile; fileRef = 04E1617B2F0FCA050022C23B /* normal_them.zip */; };
 		04FC95672EB0546C007BD342 /* KBKey.m in Sources */ = {isa = PBXBuildFile; fileRef = 04FC95652EB0546C007BD342 /* KBKey.m */; };
 		04FC956A2EB05497007BD342 /* KBKeyButton.m in Sources */ = {isa = PBXBuildFile; fileRef = 04FC95692EB05497007BD342 /* KBKeyButton.m */; };
 		04FC956D2EB054B7007BD342 /* KBKeyboardView.m in Sources */ = {isa = PBXBuildFile; fileRef = 04FC956C2EB054B7007BD342 /* KBKeyboardView.m */; };
@@ -540,7 +540,7 @@
 		04C6EAE12EAF940F0089C901 /* KBPermissionViewController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = KBPermissionViewController.m; sourceTree = "<group>"; };
 		04D1F6B02EDFF10A00B12345 /* KBSkinInstallBridge.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = KBSkinInstallBridge.h; sourceTree = "<group>"; };
 		04D1F6B12EDFF10A00B12345 /* KBSkinInstallBridge.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = KBSkinInstallBridge.m; sourceTree = "<group>"; };
-		04E161792F0FB1320022C23B /* normal_them.zip */ = {isa = PBXFileReference; lastKnownFileType = archive.zip; path = normal_them.zip; sourceTree = "<group>"; };
+		04E1617B2F0FCA050022C23B /* normal_them.zip */ = {isa = PBXFileReference; lastKnownFileType = archive.zip; path = normal_them.zip; sourceTree = "<group>"; };
 		04FC953A2EAFAE56007BD342 /* KeyBoardPrefixHeader.pch */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = KeyBoardPrefixHeader.pch; sourceTree = "<group>"; };
 		04FC95642EB0546C007BD342 /* KBKey.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = KBKey.h; sourceTree = "<group>"; };
 		04FC95652EB0546C007BD342 /* KBKey.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = KBKey.m; sourceTree = "<group>"; };
@@ -691,7 +691,7 @@
 		041007D02ECE010100D203BB /* Resource */ = {
 			isa = PBXGroup;
 			children = (
-				04E161792F0FB1320022C23B /* normal_them.zip */,
+				04E1617B2F0FCA050022C23B /* normal_them.zip */,
 				A1B2C3EC2F20000000000001 /* kb_words.txt */,
 				A1B2C3F02F20000000000002 /* kb_keyboard_layout_config.json */,
 				0498BDF42EEC50EE006CC1D5 /* emoji_categories.json */,
@@ -1826,7 +1826,7 @@
 			files = (
 				04A9FE202EB893F10020DB6D /* Localizable.strings in Resources */,
 				041007D42ECE012500D203BB /* 002.zip in Resources */,
-				04E1617A2F0FB1320022C23B /* normal_them.zip in Resources */,
+				04E1617C2F0FCA050022C23B /* normal_them.zip in Resources */,
 				041007D22ECE012000D203BB /* KBSkinIconMap.strings in Resources */,
 				A1B2C3ED2F20000000000001 /* kb_words.txt in Resources */,
 				A1B2C3F12F20000000000002 /* kb_keyboard_layout_config.json in Resources */,