diff --git a/src/components/chat/AgentHeader.tsx b/src/components/chat/AgentHeader.tsx
index 3682457..d6454ff 100644
--- a/src/components/chat/AgentHeader.tsx
+++ b/src/components/chat/AgentHeader.tsx
@@ -87,8 +87,8 @@ export const AgentHeader = ({
         boxShadow: `0 1px 0 ${alpha("#fff", 0.6)} inset`,
       }}
     >
-      <Stack direction="row" alignItems="center" spacing={2}>
-        <motion.div whileHover={{ rotate: 10, scale: 1.05 }} whileTap={{ scale: 0.95 }} style={{ display: "flex" }}>
+      <Stack direction="row" alignItems="center" spacing={2} sx={{ minWidth: 0, flex: 1, mr: 2 }}>
+        <motion.div whileHover={{ rotate: 10, scale: 1.05 }} whileTap={{ scale: 0.95 }} style={{ display: "flex", flexShrink: 0 }}>
           <Box sx={{ position: "relative" }}>
             <Avatar
               sx={{
@@ -129,9 +129,9 @@ export const AgentHeader = ({
             />
           </Box>
         </motion.div>
-        <Box sx={{ minWidth: 0 }}>
+        <Box sx={{ minWidth: 0, flex: 1 }}>
           {isEditingTitle ? (
-            <Stack direction="row" spacing={0.75} alignItems="center" sx={{ width: { xs: "calc(100vw - 256px)", sm: 280 } }}>
+            <Stack direction="row" spacing={0.75} alignItems="center" sx={{ width: "100%" }}>
                 <TextField
                   value={draftTitle}
                   onChange={(event) => setDraftTitle(event.target.value)}
@@ -226,7 +226,6 @@ export const AgentHeader = ({
                     overflow: "hidden",
                     textOverflow: "ellipsis",
                     whiteSpace: "nowrap",
-                    maxWidth: { xs: "calc(100vw - 256px)", sm: 284 },
                     px: "8px",
                     lineHeight: 1.2,
                   }}
@@ -262,7 +261,7 @@ export const AgentHeader = ({
         </Box>
       </Stack>
 
-      <Stack direction="row" spacing={1.25} alignItems="center">
+      <Stack direction="row" spacing={1.25} alignItems="center" sx={{ flexShrink: 0 }}>
         <Tooltip title="新建对话">
           <motion.div whileHover={{ scale: 1.08 }} whileTap={{ scale: 0.92 }} style={{ display: "flex" }}>
             <IconButton
diff --git a/src/components/chat/GlobalChatbox.tsx b/src/components/chat/GlobalChatbox.tsx
index 8f4db76..010405a 100644
--- a/src/components/chat/GlobalChatbox.tsx
+++ b/src/components/chat/GlobalChatbox.tsx
@@ -159,7 +159,7 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
     const handleMouseMove = (event: MouseEvent) => {
       if (!isResizing) return;
       const newWidth = window.innerWidth - event.clientX;
-      if (newWidth > 360 && newWidth < 1240) {
+      if (newWidth > 360 && newWidth < 800) {
         setWidth(newWidth);
       }
     };