diff --git a/CustomKeyboard/Model/KBKeyboardLayoutConfig.h b/CustomKeyboard/Model/KBKeyboardLayoutConfig.h
index 19e4096..1f94480 100644
--- a/CustomKeyboard/Model/KBKeyboardLayoutConfig.h
+++ b/CustomKeyboard/Model/KBKeyboardLayoutConfig.h
@@ -74,6 +74,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface KBKeyboardLayout : NSObject
 @property (nonatomic, strong, nullable) NSArray<KBKeyboardRowConfig *> *rows;
+@property (nonatomic, strong, nullable) NSArray<KBKeyboardRowConfig *> *shiftRows;
 @end
 
 @interface KBKeyboardLayoutConfig : NSObject
diff --git a/CustomKeyboard/Model/KBKeyboardLayoutConfig.m b/CustomKeyboard/Model/KBKeyboardLayoutConfig.m
index 589f26d..c8a2524 100644
--- a/CustomKeyboard/Model/KBKeyboardLayoutConfig.m
+++ b/CustomKeyboard/Model/KBKeyboardLayoutConfig.m
@@ -82,7 +82,7 @@ static NSString * const kKBKeyboardLayoutI18nFileName = @"kb_keyboard_layouts_i1
 @implementation KBKeyboardLayout
 
 + (NSDictionary *)mj_objectClassInArray {
-    return @{ @"rows": [KBKeyboardRowConfig class] };
+    return @{ @"rows": [KBKeyboardRowConfig class], @"shiftRows": [KBKeyboardRowConfig class] };
 }
 
 @end
diff --git a/CustomKeyboard/View/KBKeyboardView.m b/CustomKeyboard/View/KBKeyboardView.m
index 34c0839..af9e478 100644
--- a/CustomKeyboard/View/KBKeyboardView.m
+++ b/CustomKeyboard/View/KBKeyboardView.m
@@ -127,7 +127,14 @@ static const CGFloat kKBLettersRow2EdgeSpacerMultiplier = 0.5;
     }
 
     KBKeyboardLayout *layout = [self kb_currentLayout];
-    NSArray<KBKeyboardRowConfig *> *rows = layout.rows ?: @[];
+    NSArray<KBKeyboardRowConfig *> *rows = nil;
+    
+    if (self.shiftOn && layout.shiftRows.count > 0) {
+        rows = layout.shiftRows;
+    } else {
+        rows = layout.rows ?: @[];
+    }
+    
     if (rows.count < 4) {
         [self kb_buildLegacyLayout];
         return;
diff --git a/keyBoard/AppDelegate.m b/keyBoard/AppDelegate.m
index 415cf92..42455f4 100644
--- a/keyBoard/AppDelegate.m
+++ b/keyBoard/AppDelegate.m
@@ -25,6 +25,7 @@
 #import "KBUserSessionManager.h"
 #import "KBLoginVC.h"
 #import "KBConfig.h"
+#import "KBSkinInstallBridge.h"
 
 static NSTimeInterval const kKBSubscriptionPrefillTTL = 10 * 60.0;
 
@@ -63,11 +64,9 @@ static NSTimeInterval const kKBSubscriptionPrefillTTL = 10 * 60.0;
     [KBNetworkManager shared].enabled = YES;
     /// 获取网络权限
     [self getNetJudge];
-    /// 触发一次简单网络请求，用于拉起系统的蜂窝数据权限弹窗
-//    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
-        [self kb_fireStartupNetworkRequest];
-//    });
-//
+    
+    // 安装默认皮肤（首次安装时）
+    [self kb_installDefaultSkinIfNeeded];
     
 #if !DEBUG
 /// Bugly
@@ -453,4 +452,37 @@ static NSTimeInterval const kKBSubscriptionPrefillTTL = 10 * 60.0;
     [rootVC presentViewController:alert animated:YES completion:nil];
 }
 
+- (void)kb_installDefaultSkinIfNeeded {
+    static NSString *const kKBDefaultSkinInstalledKey = @"KBDefaultSkinInstalled";
+    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
+    
+    if ([ud boolForKey:kKBDefaultSkinInstalledKey]) {
+        NSLog(@"[AppDelegate] Default skin already installed, skip");
+        return;
+    }
+    
+    NSLog(@"[AppDelegate] Installing default skin for first launch...");
+    
+    NSString *skinId = @"bundle_skin_default_en";
+    NSString *zipName = @"normal_them.zip";
+    
+    NSDictionary<NSString *, NSString *> *iconShortNames = [KBSkinInstallBridge iconShortNamesForLanguageCode:@"en"];
+    
+    [KBSkinInstallBridge publishBundleSkinRequestWithId:skinId
+                                                  name:skinId
+                                               zipName:zipName
+                                        iconShortNames:iconShortNames];
+    
+    [KBSkinInstallBridge consumePendingRequestFromBundle:[NSBundle mainBundle]
+                                              completion:^(BOOL success, NSError * _Nullable error) {
+        if (success) {
+            NSLog(@"[AppDelegate] Default skin installed successfully");
+            [ud setBool:YES forKey:kKBDefaultSkinInstalledKey];
+            [ud synchronize];
+        } else {
+            NSLog(@"[AppDelegate] Default skin install failed: %@", error);
+        }
+    }];
+}
+
 @end