.lightbox-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;
  z-index: 99999;
  opacity: 0;
  transition: opacity 0.25s ease-in-out;
  cursor: zoom-out;
}
.lightbox-overlay img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  box-shadow: 0 10px 40px rgba(0,0,0,0.6);
  user-select: none;
}