diff --git a/design/prototype/icons.js b/design/prototype/icons.js
index 5904581..470444a 100644
--- a/design/prototype/icons.js
+++ b/design/prototype/icons.js
@@ -57,6 +57,7 @@
     'compass': '<path d="m16.24 7.76-1.804 5.411a2 2 0 0 1-1.265 1.265L7.76 16.24l1.804-5.411a2 2 0 0 1 1.265-1.265z"/><circle cx="12" cy="12" r="10"/>',
     'chart-no-axes-column': '<line x1="18" x2="18" y1="20" y2="10"/><line x1="12" x2="12" y1="20" y2="4"/><line x1="6" x2="6" y1="20" y2="14"/>',
     'chart': '<line x1="18" x2="18" y1="20" y2="10"/><line x1="12" x2="12" y1="20" y2="4"/><line x1="6" x2="6" y1="20" y2="14"/>',
+    'home': '<path d="M3 9.5 12 3l9 6.5"/><path d="M5 10v10a1 1 0 0 0 1 1h3v-6h6v6h3a1 1 0 0 0 1-1V10"/>',
     'map-pin': '<path d="M20 10c0 4.993-5.539 10.193-7.399 11.799a1 1 0 0 1-1.202 0C9.539 20.193 4 14.993 4 10a8 8 0 0 1 16 0"/><circle cx="12" cy="10" r="3"/>',
     'laptop': '<path d="M20 16V7a2 2 0 0 0-2-2H6a2 2 0 0 0-2 2v9m16 0H4m16 0 1.28 2.55a1 1 0 0 1-.9 1.45H3.62a1 1 0 0 1-.9-1.45L4 16"/>',
     'monitor-smartphone': '<path d="M18 8V6a2 2 0 0 0-2-2H4a2 2 0 0 0-2 2v7a2 2 0 0 0 2 2h8"/><path d="M10 19v-3.96 3.15"/><path d="M7 19h5"/><rect width="6" height="10" x="16" y="12" rx="2"/>',
diff --git a/tools/check-l1-sync.mjs b/tools/check-l1-sync.mjs
index 3f045d1..5a56301 100644
--- a/tools/check-l1-sync.mjs
+++ b/tools/check-l1-sync.mjs
@@ -73,7 +73,8 @@ function checkWebTokenSync(label, webPath) {
   // usercenter: export const LUCIDE: Record<string,string> = { 'name': '<path/>', ... }
   const ucJs = read('web/usercenter/components/icons.tsx');
   const ucBody = ucJs.match(/LUCIDE\s*:[^=]*=\s*\{([\s\S]*?)\n\};/)?.[1] ?? ucJs.match(/LUCIDE\s*=\s*\{([\s\S]*?)\n\};/)?.[1] ?? '';
-  for (const [, id, body] of ucBody.matchAll(/'([^']+)'\s*:\s*'([^']*)'/g)) {
+  // 键可能带引号('refresh-cw')或裸标识符(home)—— 两种都匹配(裸键此前被漏检)。
+  for (const [, id, body] of ucBody.matchAll(/['"]?([\w-]+)['"]?\s*:\s*'([^']*)'/g)) {
     if (!(id in protoIcons)) {
       problems.push(`[icons] usercenter 图标「${id}」不在原型 sprite —— 先登记 design/prototype/icons.js 再用`);
     } else if (protoIcons[id] !== body) {
diff --git a/web/usercenter/components/UserCenter.tsx b/web/usercenter/components/UserCenter.tsx
index 5e8df3a..7bda309 100644
--- a/web/usercenter/components/UserCenter.tsx
+++ b/web/usercenter/components/UserCenter.tsx
@@ -152,6 +152,10 @@ export default function UserCenter() {
           </div>
           {!mobile && <nav style={{ display: 'flex', gap: 4, flex: 1 }}>{navBtns}</nav>}
           {mobile && <div style={{ flex: 1 }} />}
+          <a href="/" title={t('backHome')} style={{ display: 'inline-flex', alignItems: 'center', gap: 7, textDecoration: 'none', color: 'var(--fg2)', fontSize: 13, fontWeight: 600, padding: 6 }}>
+            <Icon name="home" size={15} color="var(--fg3)" />
+            {!mobile && t('backHome')}
+          </a>
           <button onClick={toggleTheme} aria-label="theme" title="theme" style={{ border: 'none', background: 'transparent', cursor: 'pointer', color: 'var(--fg2)', padding: 6, display: 'flex' }}>
             <Icon name={theme === 'dark' ? 'sun' : 'moon'} size={17} color="var(--fg3)" />
           </button>
diff --git a/web/usercenter/components/icons.tsx b/web/usercenter/components/icons.tsx
index 99db11d..cb6c3f2 100644
--- a/web/usercenter/components/icons.tsx
+++ b/web/usercenter/components/icons.tsx
@@ -25,6 +25,7 @@ export const LUCIDE: Record<string, string> = {
   'shopping-bag': '<path d="M6 2 3 6v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2V6l-3-4Z"/><path d="M3 6h18"/><path d="M16 10a4 4 0 0 1-8 0"/>',
   'log-out': '<path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"/><polyline points="16 17 21 12 16 7"/><line x1="21" x2="9" y1="12" y2="12"/>',
   'external-link': '<path d="M15 3h6v6"/><path d="M10 14 21 3"/><path d="M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6"/>',
+  home: '<path d="M3 9.5 12 3l9 6.5"/><path d="M5 10v10a1 1 0 0 0 1 1h3v-6h6v6h3a1 1 0 0 0 1-1V10"/>',
   gift: '<rect x="3" y="8" width="18" height="4" rx="1"/><path d="M12 8v13"/><path d="M19 12v7a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2v-7"/><path d="M7.5 8a2.5 2.5 0 0 1 0-5A4.8 8 0 0 1 12 8a4.8 8 0 0 1 4.5-5 2.5 2.5 0 0 1 0 5"/>',
   smartphone: '<rect width="14" height="20" x="5" y="2" rx="2" ry="2"/><path d="M12 18h.01"/>',
   lock: '<rect width="18" height="11" x="3" y="11" rx="2" ry="2"/><path d="M7 11V7a5 5 0 0 1 10 0v4"/>',
diff --git a/web/usercenter/lib/i18n.ts b/web/usercenter/lib/i18n.ts
index 6fda3a8..b7f17de 100644
--- a/web/usercenter/lib/i18n.ts
+++ b/web/usercenter/lib/i18n.ts
@@ -12,6 +12,7 @@ export const STRINGS: Record<string, Entry> = {
   navInvite: { zh: '邀请返利', en: 'Referral', ja: '紹介', ko: '추천', ru: 'Рефералы', es: 'Referidos' },
   navSettings: { zh: '设置', en: 'Settings', ja: '設定', ko: '설정', ru: 'Настройки', es: 'Ajustes' },
   signOut: { zh: '退出', en: 'Sign out', ja: 'ログアウト', ko: '로그아웃', ru: 'Выйти', es: 'Cerrar sesión' },
+  backHome: { zh: '返回主页', en: 'Home', ja: 'ホーム', ko: '홈', ru: 'На главную', es: 'Inicio' },
 
   /* login */
   loginTitle: { zh: '登录用户中心', en: 'Log in to your account', ja: 'アカウントにログイン', ko: '계정에 로그인', ru: 'Вход в аккаунт', es: 'Inicia sesión en tu cuenta' },
diff --git a/web/website/src/components/Header.jsx b/web/website/src/components/Header.jsx
index 3848d52..cdf9dc2 100644
--- a/web/website/src/components/Header.jsx
+++ b/web/website/src/components/Header.jsx
@@ -30,8 +30,18 @@ export default function Header({ lang = 'zh', t = {} }) {
   const [open, setOpen] = useState(false);
   const [scrolled, setScrolled] = useState(false);
   const [langOpen, setLangOpen] = useState(false);
+  const [loggedIn, setLoggedIn] = useState(false);
   const langRef = useRef(null);
 
+  // 与用户中心同源：登录后 localStorage 存 pg_uc_refresh → 显示「用户中心」入口。
+  useEffect(() => {
+    try {
+      setLoggedIn(!!localStorage.getItem('pg_uc_refresh'));
+    } catch {
+      setLoggedIn(false);
+    }
+  }, []);
+
   useEffect(() => {
     if (!langOpen) return;
     const onDoc = (e) => { if (langRef.current && !langRef.current.contains(e.target)) setLangOpen(false); };
@@ -75,7 +85,7 @@ export default function Header({ lang = 'zh', t = {} }) {
           ))}
         </nav>
         <div class="right">
-          <div ref={langRef} style={{ position: 'relative', display: 'inline-block' }}>
+          <div ref={langRef} class="langwrap">
             <button
               type="button"
               class="langsel"
@@ -83,21 +93,18 @@ export default function Header({ lang = 'zh', t = {} }) {
               aria-haspopup="listbox"
               aria-expanded={langOpen}
               aria-label="Language"
-              style={{ display: 'inline-flex', alignItems: 'center', gap: 6 }}
             >
               <span>{(langs.find(([c]) => c === lang) || ['', 'English'])[1]}</span>
-              <svg width="11" height="11" viewBox="0 0 24 24" fill="none" aria-hidden="true"
-                style={{ transform: langOpen ? 'rotate(180deg)' : 'none', transition: 'transform 140ms' }}>
+              <svg class="caret" viewBox="0 0 24 24" fill="none" aria-hidden="true">
                 <path d="M6 9l6 6 6-6" stroke="currentColor" strokeWidth="2.4" strokeLinecap="round" strokeLinejoin="round" />
               </svg>
             </button>
             {langOpen && (
-              <div role="listbox" style={{ position: 'absolute', top: 'calc(100% + 6px)', right: 0, minWidth: 132, background: 'var(--surface)', border: '1px solid var(--border)', borderRadius: 12, boxShadow: '0 10px 30px rgba(20, 12, 6, 0.22)', padding: 5, zIndex: 60, display: 'flex', flexDirection: 'column', gap: 1 }}>
+              <div class="langmenu" role="listbox">
                 {langs.map(([code, label]) => {
                   const on = code === lang;
                   return (
-                    <a key={code} role="option" aria-selected={on} href={langHref(code)}
-                      style={{ textAlign: 'left', textDecoration: 'none', background: on ? 'var(--accent-subtle, var(--bg-subtle))' : 'transparent', color: on ? 'var(--accent)' : 'var(--fg1)', fontWeight: on ? 700 : 500, fontFamily: 'var(--font-sans)', fontSize: 13, padding: '8px 11px', borderRadius: 8, whiteSpace: 'nowrap' }}>
+                    <a key={code} role="option" aria-selected={on} href={langHref(code)}>
                       {label}
                     </a>
                   );
@@ -105,7 +112,11 @@ export default function Header({ lang = 'zh', t = {} }) {
               </div>
             )}
           </div>
-          <a class="linklogin" href={SITE.usercenter}>{t.login}</a>
+          {loggedIn ? (
+            <a class="linklogin" href={SITE.usercenter}>{t.center}</a>
+          ) : (
+            <a class="linklogin" href={SITE.usercenter}>{t.login}</a>
+          )}
           <a class="btn btn-primary" href="#download">
             <Download />
             <span>{t.get}</span>
diff --git a/web/website/src/i18n/strings.ts b/web/website/src/i18n/strings.ts
index 7630648..42d0909 100644
--- a/web/website/src/i18n/strings.ts
+++ b/web/website/src/i18n/strings.ts
@@ -38,6 +38,7 @@ export const STRINGS: Record<string, Record<Lang, string>> = {
   'nav.docs': { zh: '文档', en: 'Docs', ja: 'ドキュメント', ko: '문서', ru: 'Документация', es: 'Documentación' },
   'nav.blog': { zh: 'Blog', en: 'Blog', ja: 'ブログ', ko: '블로그', ru: 'Блог', es: 'Blog' },
   'nav.login': { zh: '登录', en: 'Log in', ja: 'ログイン', ko: '로그인', ru: 'Войти', es: 'Iniciar sesión' },
+  'nav.center': { zh: '用户中心', en: 'Account', ja: 'アカウント', ko: '계정', ru: 'Личный кабинет', es: 'Mi cuenta' },
   'nav.get': { zh: '立即下载', en: 'Get the app', ja: 'アプリを入手', ko: '앱 받기', ru: 'Получить приложение', es: 'Obtener la app' },
 
   'hero.eyebrow': { zh: '极速 · 稳定 · 省心', en: 'Fast · Stable · Effortless', ja: '高速 · 安定 · 快適', ko: '빠름 · 안정 · 간편', ru: 'Быстро · Стабильно · Без забот', es: 'Rápido · Estable · Sin complicaciones' },
diff --git a/web/website/src/layouts/Site.astro b/web/website/src/layouts/Site.astro
index 8441d93..50b0fc4 100644
--- a/web/website/src/layouts/Site.astro
+++ b/web/website/src/layouts/Site.astro
@@ -56,6 +56,7 @@ const headerT = {
   docs: t('nav.docs'),
   blog: t('nav.blog'),
   login: t('nav.login'),
+  center: t('nav.center'),
   get: t('nav.get'),
   suBtn: t('su.btn'),
 };
diff --git a/web/website/src/styles/website.css b/web/website/src/styles/website.css
index 2e7ce30..2d821b7 100644
--- a/web/website/src/styles/website.css
+++ b/web/website/src/styles/website.css
@@ -42,6 +42,17 @@ img,svg{display:block}
 .linklogin{font-size:14.5px;font-weight:600;color:var(--fg1);cursor:pointer}
 .linklogin:hover{color:var(--accent)}
 
+/* ---------- language dropdown ---------- */
+.langwrap{position:relative;display:inline-block}
+.langsel{display:inline-flex;align-items:center;gap:6px;border:1.5px solid var(--border-strong);border-radius:var(--radius-full);padding:8px 14px;background:var(--surface);color:var(--fg1);font-family:var(--font-sans);font-size:14px;font-weight:600;cursor:pointer;transition:border-color var(--dur-fast) var(--ease-out),color var(--dur-fast) var(--ease-out)}
+.langsel:hover{border-color:var(--accent);color:var(--accent)}
+.langsel .caret{width:11px;height:11px;transition:transform 140ms var(--ease-out)}
+.langsel[aria-expanded="true"] .caret{transform:rotate(180deg)}
+.langmenu{position:absolute;top:calc(100% + 6px);right:0;min-width:160px;display:flex;flex-direction:column;gap:1px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:5px;z-index:60}
+.langmenu a{text-align:left;text-decoration:none;font-family:var(--font-sans);font-size:13px;font-weight:500;color:var(--fg1);background:transparent;padding:8px 11px;border-radius:var(--radius-sm);white-space:nowrap;transition:background var(--dur-fast) var(--ease-out)}
+.langmenu a:hover{background:var(--bg-subtle)}
+.langmenu a[aria-selected="true"]{color:var(--accent);background:var(--accent-subtle);font-weight:700}
+
 /* mobile nav */
 .menu-btn{display:none;border:none;background:transparent;cursor:pointer;padding:7px;border-radius:var(--radius-sm);color:var(--fg1)}
 .menu-btn svg{width:22px;height:22px}