diff --git a/frontend/src/app/layout/app-header.test.tsx b/frontend/src/app/layout/app-header.test.tsx
index 39088912..1fcffa03 100644
--- a/frontend/src/app/layout/app-header.test.tsx
+++ b/frontend/src/app/layout/app-header.test.tsx
@@ -1,5 +1,5 @@
 // @vitest-environment jsdom
-import { cleanup, fireEvent, render, screen, waitFor } from '@testing-library/react'
+import { act, cleanup, fireEvent, render, screen, waitFor } from '@testing-library/react'
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { MemoryRouter, Route, Routes, useLocation } from 'react-router'
 
@@ -96,6 +96,7 @@ function renderHeader(
 afterEach(() => {
   cleanup()
   window.localStorage.clear()
+  window.sessionStorage.clear()
   window.history.replaceState({ idx: 0 }, '')
 })
 
@@ -223,6 +224,52 @@ describe('AppHeader', () => {
     expect(apis.logout).toHaveBeenCalledWith('rotated-refresh-token')
   })
 
+  it('登录工作台后显示一次邀请奖励提示，打开账号菜单时收起', async () => {
+    window.localStorage.setItem('windup.auth.refresh-token', 'stored-refresh-token')
+    renderHeader('/workspace')
+
+    expect(await screen.findByRole('status', { name: '邀请奖励提示' })).toBeTruthy()
+    fireEvent.click(await screen.findByRole('button', { name: '打开账号菜单' }))
+
+    expect(screen.queryByRole('status', { name: '邀请奖励提示' })).toBeNull()
+  })
+
+  it('邀请提示可以直达邀请奖励，并在关闭或十五秒后收起', async () => {
+    window.localStorage.setItem('windup.auth.refresh-token', 'stored-refresh-token')
+    const timeoutSpy = vi.spyOn(window, 'setTimeout')
+    renderHeader('/workspace')
+
+    const hint = await screen.findByRole('status', { name: '邀请奖励提示' })
+    expect(screen.getByRole('link', { name: '去看看邀请奖励' }).getAttribute('href')).toBe(
+      '/account?section=invite',
+    )
+    const timerCall = timeoutSpy.mock.calls.find(([, delay]) => delay === 15_000)
+    expect(timerCall).toBeTruthy()
+    const timerCallback = timerCall?.[0]
+    expect(typeof timerCallback).toBe('function')
+    act(() => {
+      if (typeof timerCallback === 'function') timerCallback()
+    })
+    expect(screen.queryByRole('status', { name: '邀请奖励提示' })).toBeNull()
+
+    window.sessionStorage.clear()
+    cleanup()
+    renderHeader('/workspace')
+    expect(await screen.findByRole('status', { name: '邀请奖励提示' })).toBeTruthy()
+    fireEvent.click(screen.getByRole('button', { name: '关闭邀请奖励提示' }))
+    expect(hint.isConnected).toBe(false)
+  })
+
+  it('当前登录会话离开工作台后不重复显示', async () => {
+    window.localStorage.setItem('windup.auth.refresh-token', 'stored-refresh-token')
+    renderHeader('/workspace')
+    expect(await screen.findByRole('status', { name: '邀请奖励提示' })).toBeTruthy()
+
+    fireEvent.click(screen.getByRole('link', { name: '项目资产' }))
+    fireEvent.click(screen.getByRole('link', { name: '首页' }))
+    expect(screen.queryByRole('status', { name: '邀请奖励提示' })).toBeNull()
+  })
+
   it('远端退出失败时仍清除本地会话并返回首页', async () => {
     window.localStorage.setItem('windup.auth.refresh-token', 'stored-refresh-token')
     const apis = createApis()
diff --git a/frontend/src/app/layout/app-header.tsx b/frontend/src/app/layout/app-header.tsx
index 357340fd..76bf54e3 100644
--- a/frontend/src/app/layout/app-header.tsx
+++ b/frontend/src/app/layout/app-header.tsx
@@ -3,7 +3,7 @@ import { Link, useLocation, useNavigate } from 'react-router'
 
 import { quotaApis as defaultQuotaApis } from '@/entities'
 import type { QuotaApis } from '@/entities'
-import { useAuthSession } from '@/features/auth-session'
+import { AUTH_SESSION_STORAGE_PREFIX, useAuthSession } from '@/features/auth-session'
 import { useQuotaBalance } from '@/features/quota'
 import { PageBackButton } from './page-back-button'
 
@@ -22,6 +22,7 @@ export interface AppHeaderProps {
 }
 
 const accountMenuExitDurationMs = 260
+const inviteHintStorageKey = `${AUTH_SESSION_STORAGE_PREFIX}invite-hint-seen.v1`
 
 /** 四个入口对应四种去处：回首页、看资产、做新东西、核验已完成的造型。 */
 const productNavigation: ProductNavigationItem[] = [
@@ -79,6 +80,7 @@ export function AppHeader({ quotaApis = defaultQuotaApis }: AppHeaderProps = {})
   const navigate = useNavigate()
   const session = useAuthSession()
   const [accountMenuState, setAccountMenuState] = useState<AccountMenuState>('closed')
+  const [inviteHintVisible, setInviteHintVisible] = useState(false)
   const accountMenuOpen = accountMenuState === 'open'
   const creditBalance = useQuotaBalance(
     accountMenuState !== 'closed' && session.state.status === 'authenticated',
@@ -99,15 +101,40 @@ export function AppHeader({ quotaApis = defaultQuotaApis }: AppHeaderProps = {})
     return () => window.clearTimeout(timer)
   }, [accountMenuState])
 
+  useEffect(() => {
+    if (pathname !== '/workspace' || session.state.status !== 'authenticated') {
+      setInviteHintVisible(false)
+      return
+    }
+
+    if (window.sessionStorage.getItem(inviteHintStorageKey) === '1') return
+
+    window.sessionStorage.setItem(inviteHintStorageKey, '1')
+    setInviteHintVisible(true)
+
+    const timer = window.setTimeout(() => {
+      setInviteHintVisible(false)
+    }, 15_000)
+
+    return () => window.clearTimeout(timer)
+  }, [pathname, session.state.status])
+
   function signOut() {
+    window.sessionStorage.removeItem(inviteHintStorageKey)
     const returnHome = () => navigate('/', { replace: true })
     void session.logout().then(returnHome, returnHome)
   }
 
   function toggleAccountMenu() {
+    dismissInviteHint()
     setAccountMenuState((state) => (state === 'open' ? 'closing' : 'open'))
   }
 
+  function dismissInviteHint() {
+    window.sessionStorage.setItem(inviteHintStorageKey, '1')
+    setInviteHintVisible(false)
+  }
+
   function finishAccountMenuMotion() {
     if (accountMenuState === 'closing') {
       setAccountMenuState('closed')
@@ -210,6 +237,36 @@ export function AppHeader({ quotaApis = defaultQuotaApis }: AppHeaderProps = {})
             </Link>
           ) : (
             <>
+              {inviteHintVisible ? (
+                <div
+                  role="status"
+                  aria-label="邀请奖励提示"
+                  className="absolute top-[calc(100%+0.7rem)] right-0 z-10 w-[min(15rem,calc(100vw-2rem))] rounded-lg border border-app-ink/12 bg-app-surface-raised px-3.5 py-3 text-left shadow-app-menu before:absolute before:-top-1.5 before:right-5 before:h-3 before:w-3 before:rotate-45 before:border-l before:border-t before:border-app-ink/12 before:bg-app-surface-raised"
+                >
+                  <div className="relative flex items-start gap-3">
+                    <div className="min-w-0">
+                      <p className="text-[13px] font-medium leading-5 text-app-ink-soft">
+                        邀请好友，双方各得 200 积分
+                      </p>
+                      <Link
+                        to="/account?section=invite"
+                        onClick={dismissInviteHint}
+                        className="mt-1 inline-flex text-[12px] text-app-muted underline decoration-app-ink/20 underline-offset-2 transition-colors hover:text-app-accent focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-app-accent"
+                      >
+                        去看看邀请奖励
+                      </Link>
+                    </div>
+                    <button
+                      type="button"
+                      aria-label="关闭邀请奖励提示"
+                      onClick={dismissInviteHint}
+                      className="-mr-1 -mt-1 grid h-6 w-6 shrink-0 place-items-center rounded-md text-sm leading-none text-app-faint transition-colors hover:bg-app-ink/5 hover:text-app-ink-soft focus-visible:outline-2 focus-visible:outline-offset-1 focus-visible:outline-app-accent"
+                    >
+                      ×
+                    </button>
+                  </div>
+                </div>
+              ) : null}
               <button
                 type="button"
                 aria-label="打开账号菜单"
diff --git a/frontend/src/features/auth-session/index.test.tsx b/frontend/src/features/auth-session/index.test.tsx
index 1e0d8237..8f1dca78 100644
--- a/frontend/src/features/auth-session/index.test.tsx
+++ b/frontend/src/features/auth-session/index.test.tsx
@@ -93,6 +93,7 @@ async function expectState(value: string) {
 afterEach(() => {
   cleanup()
   clearRefreshToken()
+  window.sessionStorage.clear()
   currentSession = null
   vi.useRealTimers()
 })
@@ -163,6 +164,7 @@ describe('AuthSessionProvider', () => {
   )
 
   it('clears local state before best-effort logout finishes and never restores it on failure', async () => {
+    window.sessionStorage.setItem('windup.auth-session.invite-hint-seen.v1', '1')
     const logout = deferred<void>()
     const apis = createApis()
     apis.logout.mockReturnValue(logout.promise)
@@ -175,6 +177,7 @@ describe('AuthSessionProvider', () => {
       logoutPromise = session().logout()
     })
     await expectState('guest:logged-out:')
+    expect(window.sessionStorage.getItem('windup.auth-session.invite-hint-seen.v1')).toBeNull()
     expect(getApiAccessToken()).toBeNull()
     expect(window.localStorage.getItem(REFRESH_TOKEN_STORAGE_KEY)).toBeNull()
     expect(apis.logout).toHaveBeenCalledWith('refresh-token')
diff --git a/frontend/src/features/auth-session/index.tsx b/frontend/src/features/auth-session/index.tsx
index fa5e568c..80499175 100644
--- a/frontend/src/features/auth-session/index.tsx
+++ b/frontend/src/features/auth-session/index.tsx
@@ -14,11 +14,14 @@ import type { AuthTokens, User, UserApis } from '@/entities'
 import { registerApiAccessTokenProvider, registerApiUnauthorizedRecovery } from '@/shared/api'
 import {
   REFRESH_TOKEN_STORAGE_KEY,
+  clearAuthSessionScopedStorage,
   clearRefreshToken,
   loadRefreshToken,
   saveRefreshToken,
 } from './session-storage'
 
+export { AUTH_SESSION_STORAGE_PREFIX } from './session-storage'
+
 export type AuthGuestReason = null | 'logged-out' | 'session-expired' | 'password-changed'
 
 export type AuthSessionState =
@@ -97,6 +100,7 @@ export function AuthSessionProvider({ apis, children }: AuthSessionProviderProps
       accessTokenRef.current = null
       refreshTokenRef.current = null
       if (persist) clearRefreshToken()
+      clearAuthSessionScopedStorage()
       setAccessTokenVersion((version) => version + 1)
       updateState({ status: 'guest', user: null, reason })
     },
diff --git a/frontend/src/features/auth-session/session-storage.test.ts b/frontend/src/features/auth-session/session-storage.test.ts
index 8edf5824..6f2726a1 100644
--- a/frontend/src/features/auth-session/session-storage.test.ts
+++ b/frontend/src/features/auth-session/session-storage.test.ts
@@ -1,8 +1,47 @@
 import { describe, expect, it, vi } from 'vitest'
 
-import { REFRESH_TOKEN_STORAGE_KEY, createRefreshTokenStorage } from './session-storage'
+import {
+  AUTH_SESSION_STORAGE_PREFIX,
+  REFRESH_TOKEN_STORAGE_KEY,
+  clearAuthSessionScopedStorage,
+  createRefreshTokenStorage,
+} from './session-storage'
 
 describe('refresh token storage', () => {
+  it('clears only values owned by the current auth session namespace', () => {
+    const values = new Map([
+      [`${AUTH_SESSION_STORAGE_PREFIX}invite-hint-seen.v1`, '1'],
+      ['unrelated.preference', 'keep'],
+    ])
+    const storage = {
+      get length() {
+        return values.size
+      },
+      key: (index: number) => [...values.keys()][index] ?? null,
+      removeItem: vi.fn((key: string) => values.delete(key)),
+    }
+
+    clearAuthSessionScopedStorage(storage)
+
+    expect(storage.removeItem).toHaveBeenCalledWith(
+      `${AUTH_SESSION_STORAGE_PREFIX}invite-hint-seen.v1`,
+    )
+    expect(values.get('unrelated.preference')).toBe('keep')
+  })
+
+  it('does not let unavailable session storage block session teardown', () => {
+    expect(() => clearAuthSessionScopedStorage(null)).not.toThrow()
+    expect(() =>
+      clearAuthSessionScopedStorage({
+        length: 1,
+        key: () => {
+          throw new DOMException('Storage is disabled', 'SecurityError')
+        },
+        removeItem: vi.fn(),
+      }),
+    ).not.toThrow()
+  })
+
   it('persists only the refresh token under the contracted key', () => {
     const values = new Map<string, string>()
     const storage = {
diff --git a/frontend/src/features/auth-session/session-storage.ts b/frontend/src/features/auth-session/session-storage.ts
index a79851a8..811f4248 100644
--- a/frontend/src/features/auth-session/session-storage.ts
+++ b/frontend/src/features/auth-session/session-storage.ts
@@ -1,6 +1,8 @@
 export const REFRESH_TOKEN_STORAGE_KEY = 'windup.auth.refresh-token'
+export const AUTH_SESSION_STORAGE_PREFIX = 'windup.auth-session.'
 
 type RefreshTokenStorage = Pick<Storage, 'getItem' | 'setItem' | 'removeItem'>
+type SessionScopedStorage = Pick<Storage, 'key' | 'length' | 'removeItem'>
 
 export interface RefreshTokenStore {
   load(): string | null
@@ -16,6 +18,29 @@ function getLocalStorage(): RefreshTokenStorage | null {
   }
 }
 
+function getSessionStorage(): SessionScopedStorage | null {
+  try {
+    return globalThis.sessionStorage
+  } catch {
+    return null
+  }
+}
+
+/** 清除只属于一次登录会话的 UI 标记；登出、过期和改密都经过这一边界。 */
+export function clearAuthSessionScopedStorage(storage = getSessionStorage()): void {
+  if (!storage) return
+  try {
+    const keys: string[] = []
+    for (let index = 0; index < storage.length; index += 1) {
+      const key = storage.key(index)
+      if (key?.startsWith(AUTH_SESSION_STORAGE_PREFIX)) keys.push(key)
+    }
+    for (const key of keys) storage.removeItem(key)
+  } catch {
+    // sessionStorage 不可用不应阻断登出或会话失效。
+  }
+}
+
 /**
  * localStorage 是跨刷新、跨标签的增强能力，不是维持当前页面登录的前提。
  * 浏览器拒绝存储访问时，闭包中的副本继续支撑本标签页会话。