diff --git a/TeXmacs/misc/themes/liii.css b/TeXmacs/misc/themes/liii.css
index 608d206c23..122f15f008 100644
--- a/TeXmacs/misc/themes/liii.css
+++ b/TeXmacs/misc/themes/liii.css
@@ -900,12 +900,25 @@ QWidget#text_toolbar {
   border-radius: 8px;
 }
 
+/*macOS 文本工具栏窗口样式*/
+QWidget#text_toolbar[platform="mac"] {
+  border-radius: 6px;
+}
+
 /*文本工具栏按钮样式*/
 QToolButton#text-toolbar-button {
-  background-color: transparent; 
+  background-color: transparent;
   border: none;
 }
 
+/*macOS 文本工具栏按钮样式*/
+QToolButton#text-toolbar-button[platform="mac"] {
+  min-width: 20px;
+  min-height: 20px;
+  max-width: 20px;
+  max-height: 20px;
+}
+
 /*文本工具栏按钮悬停样式*/
 QToolButton#text-toolbar-button:hover { 
   background-color: rgba(128, 128, 128, 0.3); 
diff --git a/TeXmacs/progs/generic/text-toolbar.scm b/TeXmacs/progs/generic/text-toolbar.scm
index ba5a370b85..e49e02adc7 100644
--- a/TeXmacs/progs/generic/text-toolbar.scm
+++ b/TeXmacs/progs/generic/text-toolbar.scm
@@ -37,4 +37,4 @@
   ((balloon (icon "tm_cell_center.xpm") "center")
    (make 'padded-center))
   ((balloon (icon "tm_cell_right.xpm") "right aligned")
-   (make 'padded-right-aligned)))
\ No newline at end of file
+   (make 'padded-right-aligned)))
diff --git a/devel/201_63.md b/devel/201_63.md
index 7723e3aa7f..73c9addb5f 100644
--- a/devel/201_63.md
+++ b/devel/201_63.md
@@ -8,6 +8,7 @@
    - 选中一段文本，测试是否会弹出文本工具栏
    - 点击工具栏外部，测试是否会隐藏
    - 滚动页面，测试工具栏是否跟随移动
+   - 额外检查macos上文本选中悬浮框尺寸是否合适
 
 2. **显示条件测试**
 
@@ -56,6 +57,8 @@
 - 有效选区矩形计算
 - 坐标转换一致性
 
+## 2026/3/20 针对macos特调css
+
 ## 2026/3/13 通过 scheme 加入具体的按钮
 ### What
 - 添加功能按键
diff --git a/src/Edit/Interface/edit_interface.cpp b/src/Edit/Interface/edit_interface.cpp
index c2786bef09..5d23bb8010 100644
--- a/src/Edit/Interface/edit_interface.cpp
+++ b/src/Edit/Interface/edit_interface.cpp
@@ -651,7 +651,7 @@ edit_interface_rep::notify_change (int change) {
   if ((change & (THE_TREE | THE_SELECTION | THE_CURSOR)) != 0)
     manual_focus_set (path (), (change & THE_TREE) != 0);
   // 选区变化时，使文本工具栏缓存失效
-  // 输入字符时选区变化会触发 THE_SELECTION，进而隐藏工具栏
+  // 输入字符时选区变化会触发 THE_SELECTION，进而使工具栏缓存失效并隐藏
   if ((change & THE_SELECTION) != 0) invalidate_text_toolbar_cache ();
 }
 
diff --git a/src/Plugins/Qt/QTMTextToolbar.cpp b/src/Plugins/Qt/QTMTextToolbar.cpp
index 51d045cae2..7969b74b24 100644
--- a/src/Plugins/Qt/QTMTextToolbar.cpp
+++ b/src/Plugins/Qt/QTMTextToolbar.cpp
@@ -49,6 +49,9 @@ QTMTextToolbar::QTMTextToolbar (QWidget* parent, qt_simple_widget_rep* owner)
   setAttribute (Qt::WA_ShowWithoutActivating);
   setMouseTracking (true);
   setFocusPolicy (Qt::NoFocus);
+#if defined(Q_OS_MAC)
+  setProperty ("platform", "mac");
+#endif
   layout= new QHBoxLayout (this);
   layout->setContentsMargins (0, 0, 0, 0);
   layout->setSizeConstraint (QLayout::SetMinimumSize);
@@ -126,6 +129,9 @@ QTMTextToolbar::rebuildButtonsFromScheme () {
     button->setAutoRaise (true);
     button->setDefaultAction (action);
     button->setPopupMode (QToolButton::InstantPopup);
+#if defined(Q_OS_MAC)
+    button->setProperty ("platform", "mac");
+#endif
     if (tm_style_sheet == "") button->setStyle (qtmstyle ());
     layout->addWidget (button);
   }
@@ -286,11 +292,7 @@ QTMTextToolbar::autoSize () {
       Scale * cached_magf * 12.0; // 原始3.0倍，扩大4倍后为12.0倍
   int btn_size;
 
-#if defined(Q_OS_MAC)
-  btn_size= int (50 * totalScale);
-#else
   btn_size= int (40 * totalScale);
-#endif
 
   if (cached_magf <= 0.16) {
     btn_size= 25;