/* Trình xem ảnh / video (lightbox) */

/* ========== Trình xem ảnh / video (Lightbox) ========== */
.video-expand {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 38px;
    height: 38px;
    border: none;
    border-radius: 10px;
    background: rgba(17, 24, 39, 0.65);
    backdrop-filter: blur(6px);
    color: white;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.3s;
    z-index: 3;
}

.video-expand:hover {
    background: rgba(17, 24, 39, 0.9);
    transform: scale(1.06);
}

.lightbox {
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(9, 12, 18, 0.96);
    backdrop-filter: blur(6px);
    display: none;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.lightbox.open {
    display: block;
}

.lightbox.visible {
    opacity: 1;
}

.lightbox-bar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 20px;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.55), transparent);
    z-index: 3;
}

.lightbox-counter {
    color: rgba(255, 255, 255, 0.85);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.lightbox-tools {
    display: flex;
    align-items: center;
    gap: 8px;
}

.lb-btn {
    min-width: 40px;
    height: 40px;
    padding: 0 12px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lb-btn:hover {
    background: rgba(255, 255, 255, 0.22);
}

.lb-btn.disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.lb-zoom-level {
    font-size: 13px;
    min-width: 62px;
    font-variant-numeric: tabular-nums;
}

.lightbox-stage {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.lightbox-stage.is-image {
    touch-action: none;
}

.lightbox-img {
    max-width: 92vw;
    max-height: 82vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
    transform-origin: center center;
    transition: transform 0.18s ease-out;
    cursor: zoom-in;
    user-select: none;
    -webkit-user-drag: none;
}

.lightbox-img.zoomed {
    cursor: grab;
}

.lightbox-img.dragging {
    cursor: grabbing;
    transition: none;
}

.lightbox-video {
    max-width: 92vw;
    max-height: 82vh;
    border-radius: 8px;
    background: #000;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
}

.lightbox-stage>[hidden] {
    display: none;
}

.lb-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 54px;
    height: 54px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    font-size: 26px;
    line-height: 1;
    cursor: pointer;
    transition: all 0.25s;
    z-index: 3;
}

.lb-nav:hover {
    background: rgba(255, 255, 255, 0.25);
}

.lb-nav.prev {
    left: 20px;
}

.lb-nav.next {
    right: 20px;
}

.lightbox-hint {
    position: absolute;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    text-align: center;
    padding: 0 20px;
    z-index: 3;
    pointer-events: none;
}

/* Lightbox responsive */
@media (max-width: 768px) {
    .lb-nav {
        width: 44px;
        height: 44px;
        font-size: 22px;
    }

    .lb-nav.prev {
        left: 10px;
    }

    .lb-nav.next {
        right: 10px;
    }

    .lightbox-img,
    .lightbox-video {
        max-width: 96vw;
        max-height: 74vh;
    }

    .lightbox-hint {
        font-size: 11px;
        bottom: 12px;
    }

    .lb-btn {
        min-width: 36px;
        height: 36px;
        padding: 0 8px;
        font-size: 14px;
    }

    .lb-zoom-level {
        min-width: 52px;
        font-size: 12px;
    }
}

}