diff --git a/apps/desktop/src/renderer/src/components/SidebarNav.tsx b/apps/desktop/src/renderer/src/components/SidebarNav.tsx
index db91e53..2e30631 100644
--- a/apps/desktop/src/renderer/src/components/SidebarNav.tsx
+++ b/apps/desktop/src/renderer/src/components/SidebarNav.tsx
@@ -455,8 +455,9 @@ export function SidebarNav({
           })}
         </GlideMenu>
 
-        {/* 会话列表区 */}
-        <div className="mt-3 min-h-0 flex-1 overflow-y-auto">
+        {/* 会话列表区：折叠态 margin 收敛为 1px，让「会话」切换图标与上方
+            导航图标保持同一垂直节奏（行高 32 + 间隙 1px 等距） */}
+        <div className={`min-h-0 flex-1 overflow-y-auto ${collapsed ? 'mt-px' : 'mt-3'}`}>
           <div className="relative mx-2 mb-1 h-8">
             <div className="sidebar-copy absolute inset-0">
               <button