diff --git a/src/views/AgentChat/index.js b/src/views/AgentChat/index.js
index 751760a4..fc752d7d 100644
--- a/src/views/AgentChat/index.js
+++ b/src/views/AgentChat/index.js
@@ -2,6 +2,7 @@
 // Agent聊天页面 V4 - 黑金毛玻璃设计，带模型选择和工具选择
 
 import React, { useState, useEffect, useRef } from 'react';
+import { Global, css } from '@emotion/react';
 import {
   Box,
   Flex,
@@ -699,14 +700,28 @@ const AgentChatV4 = () => {
   );
 
   return (
-    <Flex
-      w="100vw"
-      h="100vh"
-      bg={darkBg}
-      overflow="hidden"
-      position="relative"
-      flexDirection="row"
-    >
+    <>
+      {/* 全局样式：确保页面占满整个视口 */}
+      <Global
+        styles={css`
+          html, body, #root {
+            margin: 0 !important;
+            padding: 0 !important;
+            width: 100% !important;
+            height: 100% !important;
+            overflow: hidden !important;
+          }
+        `}
+      />
+
+      <Flex
+        w="100vw"
+        h="100vh"
+        bg={darkBg}
+        overflow="hidden"
+        position="relative"
+        flexDirection="row"
+      >
       <Box
         position="absolute"
         top="-50%"
@@ -1303,7 +1318,8 @@ const AgentChatV4 = () => {
           </VStack>
         </Box>
       </Collapse>
-    </Flex>
+      </Flex>
+    </>
   );
 };