let deferredPrompt;
    window.addEventListener('beforeinstallprompt', (e) => {
      e.preventDefault();
      deferredPrompt = e;

      const btn = document.createElement('button');
  btn.textContent = "📲 Installer un raccourci"; 
	  
  btn.style = `
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  background: #ff3b30;
  color: white;
  border: none;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 16px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
`;

      document.body.appendChild(btn);

      btn.addEventListener('click', () => {
        btn.remove();
        deferredPrompt.prompt();
        deferredPrompt.userChoice.then(choice => {
          if (choice.outcome === 'accepted') {
            console.log("✅ Installation acceptée");
          } else {
            console.log("❌ Installation refusée");
          }
          deferredPrompt = null;
        });
      });
    });

    if ('serviceWorker' in navigator) {
      navigator.serviceWorker.register('sw.js')
        .then(reg => console.log("✅ Service Worker enregistrer", reg))
        .catch(err => console.error("❌ Erreur SW", err));
    }