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diff --git a/public/favicon-32.png b/public/favicon-32.png
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diff --git a/public/icon-192.png b/public/icon-192.png
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diff --git a/public/icon-512-maskable.png b/public/icon-512-maskable.png
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diff --git a/public/icon-512.png b/public/icon-512.png
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diff --git a/public/manifest.webmanifest b/public/manifest.webmanifest
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--- /dev/null
+++ b/public/manifest.webmanifest
@@ -0,0 +1,16 @@
+{
+  "name": "LocalESP · Locales Españoles",
+  "short_name": "LocalESP",
+  "description": "Directorio colaborativo de negocios locales por toda España",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#8B0000",
+  "lang": "es",
+  "icons": [
+    { "src": "/icon-192.png", "sizes": "192x192", "type": "image/png", "purpose": "any" },
+    { "src": "/icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "any" },
+    { "src": "/icon-512-maskable.png", "sizes": "512x512", "type": "image/png", "purpose": "maskable" }
+  ]
+}
diff --git a/public/sw.js b/public/sw.js
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+++ b/public/sw.js
@@ -0,0 +1,46 @@
+const CACHE_NAME = "localesp-shell-v1";
+const SHELL_ASSETS = ["/", "/manifest.webmanifest", "/icon-192.png", "/icon-512.png"];
+
+self.addEventListener("install", (event) => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then((cache) => cache.addAll(SHELL_ASSETS))
+  );
+  self.skipWaiting();
+});
+
+self.addEventListener("activate", (event) => {
+  event.waitUntil(
+    caches.keys().then((keys) =>
+      Promise.all(keys.filter((k) => k !== CACHE_NAME).map((k) => caches.delete(k)))
+    )
+  );
+  self.clients.claim();
+});
+
+// Network-first para la API (los datos deben estar frescos); cache-first
+// para el resto del shell estático, para que la app abra offline.
+self.addEventListener("fetch", (event) => {
+  const url = new URL(event.request.url);
+
+  if (event.request.method !== "GET") return;
+
+  if (url.pathname.startsWith("/api/")) {
+    event.respondWith(
+      fetch(event.request).catch(() => caches.match(event.request))
+    );
+    return;
+  }
+
+  event.respondWith(
+    caches.match(event.request).then((cached) => {
+      const network = fetch(event.request)
+        .then((response) => {
+          const clone = response.clone();
+          caches.open(CACHE_NAME).then((cache) => cache.put(event.request, clone));
+          return response;
+        })
+        .catch(() => cached);
+      return cached || network;
+    })
+  );
+});