.install-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.6);
  display: none; /* default hidden */
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.install-modal {
  background: #fff;
  border-radius: 8px;
  max-width: 400px;
  width: 90%;
  padding: 20px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
  animation: fadeInUp 0.3s ease;
}

.install-btn {
  padding: 10px 18px;
  margin-right: 10px;
  border-radius: 5px;
  cursor: pointer;
}

.install-btn-primary { background: #f45; color: #fff; border: none; }
.install-btn-secondary { background: #eee; color: #333; border: none; }

@keyframes fadeInUp {
  from { transform: translateY(30px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}