.lb-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;

    background: rgba(0,0,0,0.85);

    display: flex;
    align-items: center;
    justify-content: center;

    opacity: 0;
    visibility: hidden;

    transition: opacity 0.3s ease;
    z-index: 9999;
}

.lb-overlay.active {
    opacity: 1;
    visibility: visible;
}

.lb-image {
    max-width: 90%;
    max-height: 90%;
    object-fit: contain;
}

.lb-close {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 40px;
    color: white;
    cursor: pointer;
}

.lb-prev, .lb-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 40px;
    color: white;
    cursor: pointer;
    user-select: none;
}

.lb-prev { left: 20px; }
.lb-next { right: 20px; }