.loading-spinner {
    border: 4px solid rgba(0, 0, 0, 0.1);
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 10px;
    height: 10px;
    animation: spin 1s linear infinite;
    display: inline-block;
    margin-left: 5px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

button[disabled] {
    opacity: 0.7;
    cursor: not-allowed;
}