diff --git a/CustomKeyboard/KeyboardViewController.m b/CustomKeyboard/KeyboardViewController.m
index 5b80484..a259cbb 100644
--- a/CustomKeyboard/KeyboardViewController.m
+++ b/CustomKeyboard/KeyboardViewController.m
@@ -122,7 +122,9 @@ static CGFloat KEYBOARDHEIGHT = 256 + 20;
         case KBKeyTypeGlobe:
             [self advanceToNextInputMode]; break;
         case KBKeyTypeCustom:
-            [self.textDocumentProxy insertText:@"[lang]"]; break;
+            // 点击自定义键（如“AI”）切换到功能面板
+            [self showFunctionPanel:YES];
+            break;
         case KBKeyTypeModeChange:
         case KBKeyTypeShift:
             // 这些已在 KBKeyBoardMainView/KBKeyboardView 内部处理
diff --git a/CustomKeyboard/View/KBKeyboardView.m b/CustomKeyboard/View/KBKeyboardView.m
index b5617c4..3ab30ec 100644
--- a/CustomKeyboard/View/KBKeyboardView.m
+++ b/CustomKeyboard/View/KBKeyboardView.m
@@ -118,10 +118,9 @@
                     [KBKey keyWithTitle:@"⌫" type:KBKeyTypeBackspace] ];
         }
 
-        NSArray *r4 = @[ [KBKey keyWithTitle:@"ABC" type:KBKeyTypeModeChange],
-                         [KBKey keyWithTitle:@"," output:@","],
+        NSArray *r4 = @[ [KBKey keyWithTitle:@"abc" type:KBKeyTypeModeChange],
+                         [KBKey keyWithTitle:@"AI" type:KBKeyTypeCustom],
                          [KBKey keyWithTitle:@"space" type:KBKeyTypeSpace],
-                         [KBKey keyWithTitle:@"中/英" type:KBKeyTypeCustom],
                          [KBKey keyWithTitle:@"发送" type:KBKeyTypeReturn] ];
 
         return @[r1, r2, r3, r4];
@@ -154,9 +153,8 @@
     [row3 addObject:[KBKey keyWithTitle:@"⌫" type:KBKeyTypeBackspace]];
 
     NSArray *row4 = @[ [KBKey keyWithTitle:@"123" type:KBKeyTypeModeChange],
-                       [KBKey keyWithTitle:@"," output:@","],
+                       [KBKey keyWithTitle:@"AI" type:KBKeyTypeCustom],
                        [KBKey keyWithTitle:@"space" type:KBKeyTypeSpace],
-                       [KBKey keyWithTitle:@"中/英" type:KBKeyTypeCustom],
                        [KBKey keyWithTitle:@"发送" type:KBKeyTypeReturn] ];
 
     return @[row1.copy, row2.copy, row3.copy, row4];
@@ -245,6 +243,10 @@
     for (KBKeyButton *b in row.subviews) {
         if ([b isKindOfClass:[KBKeyButton class]] && b.key.type == KBKeyTypeCharacter) { firstChar = b; break; }
     }
+    // 若该行没有字符键（例如底部控制行），则使用行内第一个按钮作为基准宽度
+    if (!firstChar) {
+        for (KBKeyButton *b in row.subviews) { if ([b isKindOfClass:[KBKeyButton class]]) { firstChar = b; break; } }
+    }
     if (firstChar) {
         for (KBKeyButton *b in row.subviews) {
             if (![b isKindOfClass:[KBKeyButton class]]) continue;