/* Náhled obrázku */
.thumbnail {
    width: 50%;
    max-width: 600px;
    cursor: pointer;
    border-radius: 8px;
    transition: transform 0.3s ease;
    box-shadow: 0 4px 12px rgba(0,0,0,.2);
}

.thumbnail:hover {
    transform: scale(1.03);
}

/* Lightbox */
.lightbox {
    display: flex;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.9);
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s ease;
    z-index: 9999;
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox img {
    max-width: 90%;
    max-height: 90%;
    animation: zoom .3s ease;
}

@keyframes zoom {
    from {
        transform: scale(.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* Zavírací tlačítko */
.close {
    position: absolute;
    top: 20px;
    right: 30px;
    color: white;
    font-size: 42px;
    cursor: pointer;
    user-select: none;
}