#overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    display: none;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 20px;
    z-index: 10000;
    text-align: center;
    backdrop-filter: blur(10px);
}


.spinner {
    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid #3498db;
    width: 120px;
    height: 120px;
    animation: spin 2s linear infinite;
    margin: auto;
    margin-top: 30vh;
}

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