diff --git a/CustomKeyboard/View/KBFunctionView.m b/CustomKeyboard/View/KBFunctionView.m
index 533d167..4bee11f 100644
--- a/CustomKeyboard/View/KBFunctionView.m
+++ b/CustomKeyboard/View/KBFunctionView.m
@@ -136,19 +136,24 @@
 - (void)setupUI {
     // 1. 顶部 Bar
     [self addSubview:self.barViewInternal];
+    CGFloat barTopInset = KBFit(6.0f);
+    CGFloat barHeight = KBFit(52.0f);
     [self.barViewInternal mas_makeConstraints:^(MASConstraintMaker *make) {
         make.left.right.equalTo(self);
-        make.top.equalTo(self.mas_top).offset(6);
-        make.height.mas_equalTo(52);
+        make.top.equalTo(self.mas_top).offset(barTopInset);
+        make.height.mas_equalTo(barHeight);
     }];
 
     // 右侧竖排按钮容器
     [self addSubview:self.rightButtonContainer];
+    CGFloat rightInset = KBFit(4.0f);
+    CGFloat containerBottomInset = KBFit(10.0f);
+    CGFloat containerWidth = KBFit(60.0f);
     [self.rightButtonContainer mas_makeConstraints:^(MASConstraintMaker *make) {
-        make.right.equalTo(self.mas_right).offset(-4);
+        make.right.equalTo(self.mas_right).offset(-rightInset);
         make.top.equalTo(self.barViewInternal.mas_bottom).offset(0);
-        make.bottom.equalTo(self.mas_bottom).offset(-10);
-        make.width.mas_equalTo(60);
+        make.bottom.equalTo(self.mas_bottom).offset(0);
+        make.width.mas_equalTo(containerWidth);
     }];
 
     // 右侧四个按钮
@@ -158,10 +163,10 @@
     [self.rightButtonContainer addSubview:self.sendButtonInternal];
 
     // 竖向排布：粘贴、删除、清空为等高；发送优先更高，但允许在空间不足时压缩
-    CGFloat smallH = 41;
-    CGFloat bigH = 56;
-    // 原 10 在键盘总高度 276 下容易超出容器，改为 8 以避免 AutoLayout 冲突
-    CGFloat vSpace = 4;
+    CGFloat smallH = KBFit(41.0f);
+    CGFloat bigH = KBFit(56.0f);
+    // 竖向/横向间距按设计稿等比缩放，避免大屏出现过大空隙
+    CGFloat vSpace = KBFit(4.0f);
     [self.pasteButtonInternal mas_makeConstraints:^(MASConstraintMaker *make) {
         make.top.equalTo(self.rightButtonContainer.mas_top);
         make.left.right.equalTo(self.rightButtonContainer);
@@ -202,8 +207,8 @@
     [self.tagListView mas_makeConstraints:^(MASConstraintMaker *make) {
         make.left.equalTo(self.pasteViewInternal);
         make.right.equalTo(self.rightButtonContainer.mas_left).offset(-vSpace);
-        make.top.equalTo(self.pasteViewInternal.mas_bottom).offset(vSpace);
-        make.bottom.equalTo(self.mas_bottom).offset(-10);
+        make.top.equalTo(self.pasteViewInternal.mas_bottom).offset(0);
+        make.bottom.equalTo(self.mas_bottom).offset(0);
     }];
 }
 
@@ -238,11 +243,13 @@
     [self addSubview:overlay];
     [overlay mas_makeConstraints:^(MASConstraintMaker *make) {
         // 在原标签区域内展示流式文本，右侧继续保留竖排按钮栏
-        CGFloat vSpace = 4.0;
+        CGFloat vSpace = KBFit(4.0f);
+        CGFloat overlayTopInset = KBFit(10.0f);
+        CGFloat overlayBottomInset = KBFit(10.0f);
         make.left.equalTo(self.pasteViewInternal);
         make.right.equalTo(self).offset(-vSpace);
-        make.top.equalTo(self.pasteViewInternal.mas_bottom).offset(10);
-        make.bottom.equalTo(self.mas_bottom).offset(-10);
+        make.top.equalTo(self.pasteViewInternal.mas_bottom).offset(overlayTopInset);
+        make.bottom.equalTo(self.mas_bottom).offset(-overlayBottomInset);
     }];
     // 仅隐藏删除/清空/发送按钮，保留“Paste”按钮可用
     self.pasteButtonInternal.hidden = NO;