static/service-worker.js

// Service Worker for ECHO TUTOR PRO PWA
const CACHE_NAME = 'echo-tutor-cache-v1';
const urlsToCache = [
  '/',
  '/static/css/style.css',
  '/static/js/script.js',
  '/static/manifest.json',
  // Add more assets if needed
];

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

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.filter(key => key !== CACHE_NAME).map(key => caches.delete(key))
    ))
  );
});