diff --git a/components/ChatInputBox/ChatInputBox.tsx b/components/ChatInputBox/ChatInputBox.tsx
index 6926fd2..76ef54f 100644
--- a/components/ChatInputBox/ChatInputBox.tsx
+++ b/components/ChatInputBox/ChatInputBox.tsx
@@ -392,15 +392,14 @@ export function ChatInputBox({ noData }: { noData: boolean }) {
                   {/* 剧本扩展开关 */}
                   <Tooltip title="Enable script expansion" placement="top" trigger={isDesktop ? "hover" : "click"}>
                     <div data-alt="config-expansion-mode" className="flex items-center gap-2 px-2">
-                      {/* <span className="text-sm text-white/80">Script Expansion</span> */}
-                      <Switch
-                        size="small"
-                        checked={configOptions.expansion_mode}
-                        onChange={(checked) => onConfigChange('expansion_mode', checked)}
-                        style={{
-                          backgroundColor: 'rgba(255,255,255,0.45)',
-                        }}
-                      />
+                      {/* 仅在未选中时显示背景色，避免覆盖选中态 */}
+                      <div className={`${configOptions.expansion_mode ? 'bg-transparent' : 'bg-white/40'} rounded-full p-0.5 transition-colors`}>
+                        <Switch
+                          size="small"
+                          checked={configOptions.expansion_mode}
+                          onChange={(checked) => onConfigChange('expansion_mode', checked)}
+                        />
+                      </div>
                       <span className={`text-xs text-white/50`}>
                         {configOptions.expansion_mode ? 'On' : 'Off'}
                       </span>