diff --git a/services/tui_service.py b/services/tui_service.py
index a899bce..c488223 100644
--- a/services/tui_service.py
+++ b/services/tui_service.py
@@ -553,6 +553,10 @@ class TUIFramework(App):
     def _generate_css(self):
         """动态生成 CSS — dock 布局：标题 + 状态栏 + 主内容 + 底部输入"""
         return """
+    Header {
+        dock: top;
+    }
+
     #monitor-area {
         dock: top;
         padding: 1 1 0 1;