.itbs-lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 999999;
    opacity: 0;
    transition: opacity 0.2s ease;
}
.itbs-lightbox.is-open { display: flex; opacity: 1; }
.itbs-lightbox__content {
    position: relative;
    max-width: 95vw;
    max-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.itbs-lightbox__img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 12px;
    background: #0f172a;
}
.itbs-lightbox__close {
    position: absolute;
    top: -40px;
    right: 0;
    background: #fff;
    color: #0f172a;
    border: none;
    border-radius: 999px;
    padding: 8px 12px;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 10px 30px -20px rgba(0,0,0,0.5);
}
.itbs-lightbox__nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255,255,255,0.9);
    color: #0f172a;
    border: none;
    border-radius: 999px;
    width: 44px;
    height: 44px;
    font-size: 20px;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 10px 30px -20px rgba(0,0,0,0.5);
}
.itbs-lightbox__nav:hover { background: #fff; }
.itbs-lightbox__nav.prev { left: -56px; }
.itbs-lightbox__nav.next { right: -56px; }
.itbs-lightbox__counter {
    position: absolute;
    bottom: -36px;
    left: 50%;
    transform: translateX(-50%);
    color: #e5e7eb;
    font-weight: 700;
    font-size: 13px;
}
@media (max-width: 640px) {
    .itbs-lightbox__nav.prev { left: 8px; }
    .itbs-lightbox__nav.next { right: 8px; }
    .itbs-lightbox__close { top: 8px; right: 8px; }
}