#page-overlay {
    position: fixed;
    inset: 0;
    background: #fff;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

#page-overlay.active {
    opacity: 1;
    pointer-events: all;
}
body {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}