body { font-family: Arial, sans-serif; }
input, button { margin: 5px; padding: 8px; }
button { background-color: #4CAF50; color: white; border: none; }
#toast { position: fixed; bottom: 20px; right: 20px; background: #333; color: #fff; padding: 10px; border-radius: 5px; }
.toast.success { background-color: #4CAF50; }
.toast.error { background-color: #f44336; }
#loading { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.5); color: white; font-size: 24px; align-items: center; justify-content: center; z-index: 9999; }