diff --git a/frontend/web/src/admin/AdminApp.tsx b/frontend/web/src/admin/AdminApp.tsx
index b81f401..514183e 100644
--- a/frontend/web/src/admin/AdminApp.tsx
+++ b/frontend/web/src/admin/AdminApp.tsx
@@ -5,7 +5,7 @@ import { useAppStore } from "../store/useAppStore";
 import type { WsStatus } from "../lib/types";
 import { UiModeSwitch } from "../design/UiModeSwitch";
 import { ADMIN_GROUPS, ADMIN_SECTIONS } from "./sections";
-import { navigateAdmin, type AdminSectionId } from "./router";
+import { navigateAdmin, navigateUserShell, type AdminSectionId } from "./router";
 import { Button, Tag, type TagTone } from "../components/primitives";
 import { Icon } from "../components/Icon";
 import { DashboardModule } from "./modules/Dashboard";
@@ -239,7 +239,7 @@ function AdminTopBar({ section, onMenu }: { section: AdminSectionId; onMenu?: ()
       >
         <Icon name={theme === "dark" ? "sun" : "moon"} size={18} />
       </button>
-      <Button size="sm" variant="ghost" className="shrink-0" onClick={() => { window.location.hash = ""; }}>
+      <Button size="sm" variant="ghost" className="shrink-0" onClick={() => { navigateUserShell(); }}>
         返回用户端
       </Button>
     </header>
@@ -256,7 +256,7 @@ function LoginGate(): React.ReactNode {
       <p className="max-w-md text-sm text-[var(--mu-text-lo)]">
         管理面板需持有 JWT。请先在用户端 <span className="text-[var(--mu-text-hi)]">登录页</span> 完成登录后，再返回本页。
       </p>
-      <Button variant="primary" onClick={() => { window.location.hash = ""; }}>前往用户端登录</Button>
+      <Button variant="primary" onClick={() => { navigateUserShell(); }}>前往用户端登录</Button>
     </div>
   );
 }
@@ -273,7 +273,7 @@ function Forbidden403(): React.ReactNode {
         当前角色 <Tag tone="neutral">{role ?? "?"}</Tag>（viewer 只读）。管理面板需 <Tag tone="accent">owner</Tag> 或 <Tag tone="ok">admin</Tag> 角色；管理端写操作仅 owner。
       </p>
       <div className="flex gap-2">
-        <Button variant="primary" onClick={() => { window.location.hash = ""; }}>返回用户端</Button>
+        <Button variant="primary" onClick={() => { navigateUserShell(); }}>返回用户端</Button>
       </div>
     </div>
   );
diff --git a/frontend/web/src/components/Nav.tsx b/frontend/web/src/components/Nav.tsx
index b835e02..66edc2a 100644
--- a/frontend/web/src/components/Nav.tsx
+++ b/frontend/web/src/components/Nav.tsx
@@ -16,7 +16,7 @@ import { Tag } from "./primitives";
  * at runtime by the agent / user, and rendered per message). This is a small
  * navigation rail: brand + connection status + the conversation list
  * (`SessionRail`, which also owns per-session role picking, design/22 §4.6) +
- * theme + admin/settings entry.
+ * 主题切换 + UI 档位开关（双档，裁决 16.4.4）。
  *
  * Two surface variants share the same NavContent:
  *   - Sidebar  (desktop): fixed rail, `hidden md:flex`.
@@ -76,22 +76,6 @@ function NavContent({ onNavigate }: { onNavigate: () => void }): React.ReactNode
       {hasToken ? <SessionRail onNavigate={onNavigate} /> : null}
 
       <div className="mt-auto flex flex-col gap-1">
-        <NavItem
-          icon="settings"
-          label="设置"
-          onClick={() => {
-            window.location.hash = "#/admin/system";
-            onNavigate();
-          }}
-        />
-        <NavItem
-          icon="shield"
-          label="管理面板"
-          onClick={() => {
-            window.location.hash = "#/admin";
-            onNavigate();
-          }}
-        />
         <NavItem
           icon={theme === "dark" ? "sun" : "moon"}
           label={theme === "dark" ? "浅色" : "深色"}
diff --git a/frontend/web/src/components/TopBar.tsx b/frontend/web/src/components/TopBar.tsx
index aff0090..e339713 100644
--- a/frontend/web/src/components/TopBar.tsx
+++ b/frontend/web/src/components/TopBar.tsx
@@ -82,14 +82,6 @@ export function TopBar({ onMenu }: { onMenu: () => void }): React.ReactNode {
         {meta.label}
       </Tag>
 
-      <button
-        onClick={() => { window.location.hash = "#/admin"; }}
-        aria-label="管理面板"
-        title="管理面板 /admin"
-        className="inline-flex h-8 w-8 shrink-0 items-center justify-center rounded-[var(--mu-radius)] bg-[var(--mu-surface-4)] text-sm transition-all duration-200 ease-[var(--mu-spring)] hover:bg-[var(--mu-surface-5)] active:scale-95"
-      >
-        <Icon name="shield" size={18} />
-      </button>
       {/* 双档 UI 档位（裁决 16.4.4）：胶囊形态，尺寸对齐本栏其余 h-8 按钮。
           窄屏（<sm）本栏已被头像/状态位占满，再塞 88px 会把角色名挤没甚至横向溢出，
           故窄屏收起——移动端改由侧栏抽屉里的分段开关切档（Nav.tsx）。 */}