.overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 99999;
            display: none;
            justify-content: center;
            align-items: center;
        }
.spinner {
            border: 4px solid rgba(255, 255, 255, 0.3);
            border-top: 4px solid #fff;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
        }
@keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }