diff --git a/src/app/panel/components/Header.tsx b/src/app/panel/components/Header.tsx
index ab70b4d..9495cde 100644
--- a/src/app/panel/components/Header.tsx
+++ b/src/app/panel/components/Header.tsx
@@ -1,7 +1,9 @@
 'use client'
 
 import Link from 'next/link'
+import { useRouter } from 'next/navigation'
 import { ChevronLeft, ChevronRight, Menu } from 'lucide-react'
+import { useEffect, useMemo, useState } from 'react'
 
 import { useUserStore } from '@lib/userStore'
 import type { UserRole } from '@lib/userStore'
@@ -48,6 +50,7 @@ function resolveAccountInitial(input?: string | null) {
 
 export default function Header({ onMenu, onCollapse, isCollapsed }: HeaderProps) {
   const { language } = useLanguage()
+  const router = useRouter()
   const user = useUserStore((state) => state.user)
   const isLoading = useUserStore((state) => state.isLoading)
   const role: UserRole = user?.role ?? 'guest'
@@ -59,8 +62,104 @@ export default function Header({ onMenu, onCollapse, isCollapsed }: HeaderProps)
     ? 'bg-[var(--color-surface-muted)] text-[var(--color-text-subtle)] opacity-70'
     : badge.className
 
+  const isRoot = useMemo(() => {
+    const email = user?.email?.trim().toLowerCase() ?? ''
+    return email === 'admin@svc.plus' && role === 'admin'
+  }, [role, user?.email])
+
+  const [assumeStatus, setAssumeStatus] = useState<{ isAssuming: boolean; target?: string }>({
+    isAssuming: false,
+  })
+  const [assumeBusy, setAssumeBusy] = useState(false)
+
+  useEffect(() => {
+    let cancelled = false
+    void (async () => {
+      try {
+        const res = await fetch('/api/sandbox/assume/status', { method: 'GET', cache: 'no-store' })
+        const payload = (await res.json().catch(() => null)) as any
+        if (cancelled) return
+        setAssumeStatus({
+          isAssuming: Boolean(payload?.isAssuming),
+          target: typeof payload?.target === 'string' ? payload.target : undefined,
+        })
+      } catch {
+        if (cancelled) return
+        setAssumeStatus({ isAssuming: false })
+      }
+    })()
+    return () => {
+      cancelled = true
+    }
+  }, [])
+
+  const handleAssumeSandbox = async () => {
+    if (!isRoot || assumeBusy) return
+    try {
+      setAssumeBusy(true)
+      const res = await fetch('/api/sandbox/assume', { method: 'POST', cache: 'no-store', credentials: 'include' })
+      if (!res.ok) {
+        const payload = (await res.json().catch(() => null)) as any
+        throw new Error((payload && (payload.message || payload.error)) || `Assume failed (${res.status})`)
+      }
+      router.refresh()
+      // Ensure server-rendered parts reflect the new cookie immediately.
+      window.location.reload()
+    } finally {
+      setAssumeBusy(false)
+    }
+  }
+
+  const handleRevertAssume = async () => {
+    if (assumeBusy) return
+    try {
+      setAssumeBusy(true)
+      const res = await fetch('/api/sandbox/assume/revert', { method: 'POST', cache: 'no-store', credentials: 'include' })
+      if (!res.ok) {
+        const payload = (await res.json().catch(() => null)) as any
+        throw new Error((payload && (payload.message || payload.error)) || `Revert failed (${res.status})`)
+      }
+      router.refresh()
+      window.location.reload()
+    } finally {
+      setAssumeBusy(false)
+    }
+  }
+
   return (
-    <header className="sticky top-0 z-30 flex items-center justify-between border-b border-[color:var(--color-surface-border)] bg-[var(--color-surface-translucent)] px-4 py-3 text-[var(--color-text)] shadow-[var(--shadow-sm)] backdrop-blur transition-colors md:px-6">
+    <header className="sticky top-0 z-30 border-b border-[color:var(--color-surface-border)] bg-[var(--color-surface-translucent)] text-[var(--color-text)] shadow-[var(--shadow-sm)] backdrop-blur transition-colors">
+      {assumeStatus.isAssuming ? (
+        <div className="flex items-center justify-between gap-3 px-4 py-2 text-xs md:px-6">
+          <div className="rounded-full border border-[color:var(--color-warning-muted)] bg-[var(--color-warning-muted)] px-3 py-1 text-[var(--color-warning-foreground)]">
+            {language === 'zh'
+              ? `当前处于 Assume: ${assumeStatus.target || 'sandbox@svc.plus'}（只读视角）`
+              : `Assuming: ${assumeStatus.target || 'sandbox@svc.plus'} (read-only view)`}
+          </div>
+          <button
+            type="button"
+            onClick={() => void handleRevertAssume()}
+            disabled={assumeBusy}
+            className="rounded-full border border-[color:var(--color-warning-muted)] px-3 py-1 text-[var(--color-warning-foreground)] transition-colors hover:bg-[var(--color-warning-muted)] disabled:opacity-60"
+          >
+            {assumeBusy ? (language === 'zh' ? '处理中…' : 'Working…') : language === 'zh' ? '退出 Sandbox' : 'Exit Sandbox'}
+          </button>
+        </div>
+      ) : (
+        <div className="flex items-center justify-end gap-2 px-4 py-2 text-xs md:px-6">
+          {isRoot ? (
+            <button
+              type="button"
+              onClick={() => void handleAssumeSandbox()}
+              disabled={assumeBusy || isLoading}
+              className="rounded-full border border-[color:var(--color-primary-border)] px-3 py-1 text-[var(--color-primary)] transition-colors hover:bg-[var(--color-primary-muted)] disabled:opacity-60"
+            >
+              {assumeBusy ? (language === 'zh' ? '处理中…' : 'Working…') : language === 'zh' ? '切换到 Sandbox' : 'Assume Sandbox'}
+            </button>
+          ) : null}
+        </div>
+      )}
+
+      <div className="flex items-center justify-between px-4 py-3 md:px-6">
       <div className="flex items-center gap-4">
         <button
           type="button"
@@ -102,6 +201,7 @@ export default function Header({ onMenu, onCollapse, isCollapsed }: HeaderProps)
           </div>
         </div>
       </div>
+      </div>
     </header>
   )
 }