/* ---------- Lightbox ---------- */

.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  align-items: center;
  justify-content: center;
  padding: 30px;
  /* Phai cao hon moi modal khac (activity-modal/media-library-modal = 110) vi
     lightbox thuong duoc mo TU BEN TRONG cac modal do (bam anh trong Thu vien
     anh) - neu thap hon, anh mo ra se bi modal dang mo de len tren, nhin nhu
     "chim xuong duoi". */
  z-index: 200;
  cursor: zoom-out;
}

.lightbox.active { display: flex; }

.lightbox img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 6px;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: #fff;
  cursor: pointer;
  z-index: 1;
  transition: background 0.15s ease, transform 0.15s ease;
}

.lightbox-nav:hover,
.lightbox-nav:focus-visible {
  background: rgba(255, 255, 255, 0.28);
}

.lightbox-nav:active {
  transform: translateY(-50%) scale(0.92);
}

.lightbox-prev { left: 16px; }
.lightbox-next { right: 16px; }

@media (max-width: 640px) {
  .lightbox-nav { width: 40px; height: 40px; }
  .lightbox-prev { left: 6px; }
  .lightbox-next { right: 6px; }
}

.lightbox-counter {
  position: absolute;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  padding: 5px 12px;
  border-radius: 20px;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  font-size: 0.8rem;
  letter-spacing: 0.3px;
}