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diff --git a/index.html b/index.html
index 98d3ed7..e6144e0 100644
--- a/index.html
+++ b/index.html
@@ -4,6 +4,15 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover" />
   <title>工时薪酬助手</title>
+  <meta name="theme-color" content="#312E81" />
+  <!-- PWA 可安装三件套：manifest / iOS 专属图标 / SW 注册（见 setup 末尾 boot 钩子）。
+       只在 HTTPS（或 localhost）安全上下文生效，HTTP 裸访问自动降级为普通网页，不影响现有行为。 -->
+  <link rel="manifest" href="manifest.webmanifest" />
+  <link rel="apple-touch-icon" href="/icons/apple-touch-icon.png" />
+  <meta name="mobile-web-app-capable" content="yes" />
+  <meta name="apple-mobile-web-app-capable" content="yes" />
+  <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
+  <meta name="apple-mobile-web-app-title" content="工时薪酬" />
   <link rel="icon" href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'%3E%3Crect width='32' height='32' rx='8' fill='%234F46E5'/%3E%3Cpath d='M16 8v8l5 3' stroke='white' stroke-width='2.5' stroke-linecap='round' fill='none'/%3E%3C/svg%3E" />
   <!-- 本地依赖，不走 CDN：
        原来用 cdn.tailwindcss.com 是运行时 JIT 编译器，它必须先把页面扫一遍再注入样式，
@@ -1955,6 +1964,18 @@ createApp({
       }
     });
 
+    // PWA：注册 Service Worker。放在 onMounted 里跑：
+    //   1) 不阻塞首次启动；2) 与启动守卫天然隔离 —— SW 注册失败绝不影响页面本身；
+    //   3) verify_payroll.js / app-harness 的 document 桩件没有 serviceWorker 字段，onMounted 里可安全跳过。
+    // HTTPS 才有 navigator.serviceWorker，HTTP 裸访问自动跳过，页面退化为普通网页。
+    onMounted(() => {
+      if ('serviceWorker' in navigator) {
+        navigator.serviceWorker.register('/sw.js').catch((e) => {
+          console.warn('[pwa] SW 注册失败（不影响使用）：', e && e.message);
+        });
+      }
+    });
+
     watch(settings, () => {
       localStorage.setItem('work_settings', JSON.stringify({ ...settings }));
       if (!suppressSync && window.WHTSync) window.WHTSync.markDirty('settings');
diff --git a/manifest.webmanifest b/manifest.webmanifest
new file mode 100644
index 0000000..3961726
--- /dev/null
+++ b/manifest.webmanifest
@@ -0,0 +1,20 @@
+{
+  "name": "工时薪酬助手",
+  "short_name": "工时薪酬",
+  "description": "工时排班记账与多周期薪酬核算，本地优先，离线可用。",
+  "lang": "zh-CN",
+  "dir": "ltr",
+  "id": "/",
+  "start_url": "/?source=pwa",
+  "scope": "/",
+  "display": "standalone",
+  "orientation": "portrait",
+  "theme_color": "#312E81",
+  "background_color": "#F8FAFC",
+  "icons": [
+    { "src": "/icons/icon-192.png", "sizes": "192x192", "type": "image/png", "purpose": "any" },
+    { "src": "/icons/icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "any" },
+    { "src": "/icons/icon-maskable-192.png", "sizes": "192x192", "type": "image/png", "purpose": "maskable" },
+    { "src": "/icons/icon-maskable-512.png", "sizes": "512x512", "type": "image/png", "purpose": "maskable" }
+  ]
+}
\ No newline at end of file
diff --git a/sw.js b/sw.js
new file mode 100644
index 0000000..2bd3756
--- /dev/null
+++ b/sw.js
@@ -0,0 +1,93 @@
+/**
+ * 工时薪酬助手 — Service Worker
+ *
+ * 职责（刻意收得很窄）：
+ *   1. 预缓存页面骨架（index.html / sync.js / payroll.js / vendor 两件 / manifest / 图标），
+ *      保证离线或服务器彻底挂掉时页面能完整启动。
+ *   2. 导航请求走 network-first + 离线兜底 index.html：在线时永远拿最新版，
+ *      离线时用预缓存的骨架（本地记账照常，数据在 localStorage，与 SW 无关）。
+ *   3. 静态资源 network-first：在线优先最新（no-cache 本来就要求「用前先问」），
+ *      网络失败才回缓存 —— SW 不改变现有缓存策略，只补「彻底断网」这一层。
+ *   4. /api/* 与 /mcp/sse 一律不碰：同步引擎自己有超时与 offline 处理，
+ *      SW 绝不缓存 API 响应，避免「读到旧数据以为同步成功」的假象。
+ *
+ * 版本升级：静态资源 no-cache+ETag，导航每次都回源，新 index.html 引用的
+ * vendor ?v= 指纹变化会触发重下，PRECACHE 键值同步更新即可。旧缓存条目
+ * activate 时统一清理，不做遗留兜底。
+ */
+const VERSION = 'v1';
+const PRECACHE = `wht-precache-${VERSION}`;
+const RUNTIME = `wht-runtime-${VERSION}`;
+
+// 页面骨架：缺一个离线就是白屏，全部预缓存。
+const PRECACHE_URLS = [
+  '/',
+  '/index.html',
+  '/sync.js',
+  '/shared/payroll.js',
+  '/vendor/vue.global.prod.js',
+  '/vendor/tailwind.css',
+  '/manifest.webmanifest',
+  '/icons/icon-192.png',
+  '/icons/icon-512.png',
+  '/icons/icon-maskable-192.png',
+  '/icons/icon-maskable-512.png'
+];
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(PRECACHE)
+      .then((cache) => cache.addAll(PRECACHE_URLS))
+      // 骨架里任何一个取不到就放弃安装：宁可没有 SW 也不能装出半个能用的
+      .then(() => self.skipWaiting())
+  );
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys()
+      .then((keys) => Promise.all(
+        keys.filter((k) => k !== PRECACHE && k !== RUNTIME)
+            .map((k) => caches.delete(k))
+      ))
+      .then(() => self.clients.claim())
+  );
+});
+
+self.addEventListener('message', (event) => {
+  if (event.data === 'SKIP_WAITING') self.skipWaiting();
+});
+
+/** network-first：先在线取，失败回运行时缓存，再失败回预缓存。 */
+async function networkFirst(request, cacheName) {
+  const cache = await caches.open(cacheName);
+  try {
+    const res = await fetch(request);
+    if (res && res.ok) cache.put(request, res.clone());
+    return res;
+  } catch (e) {
+    const cached = await cache.match(request, { ignoreSearch: request.mode === 'navigate' });
+    if (cached) return cached;
+    // 导航请求最终兜底：预缓存的 index.html（ignoreSearch 吞掉 ?source=pwa 等查询）
+    const pre = await caches.open(PRECACHE);
+    const fallback = await pre.match('/index.html', { ignoreSearch: true });
+    if (fallback) return fallback;
+    throw e;
+  }
+}
+
+self.addEventListener('fetch', (event) => {
+  const url = new URL(event.request.url);
+
+  // 只管同源 GET；跨域与 /api/*、/mcp/* 直接放行给网络
+  if (url.origin !== self.location.origin) return;
+  if (event.request.method !== 'GET') return;
+  if (url.pathname.startsWith('/api/') || url.pathname.startsWith('/mcp/')) return;
+
+  if (event.request.mode === 'navigate') {
+    event.respondWith(networkFirst(event.request, RUNTIME));
+    return;
+  }
+
+  event.respondWith(networkFirst(event.request, RUNTIME));
+});
\ No newline at end of file