sw.js

const CACHE_NAME = 'code-to-adventure-v1';
const ASSETS = [
  '/',
  '/index.php',
  '/styles/main.css',
  '/js/main.js',
  '/favicon.ico',
  'https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap'
];

self.addEventListener('install', event => {
  event.waitUntil(
    caches.open(CACHE_NAME)
      .then(cache => cache.addAll(ASSETS))
  );
});

self.addEventListener('fetch', event => {
  event.respondWith(
    caches.match(event.request)
      .then(response => response || fetch(event.request))
  );
});

self.addEventListener('activate', event => {
  event.waitUntil(
    caches.keys().then(keys => Promise.all(
      keys.map(key => {
        if (key !== CACHE_NAME) {
          return caches.delete(key);
        }
      })
    ))
  );
});