#lb-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.92);
  z-index: 50;
  align-items: center;
  justify-content: center;
  padding: 24px;
  cursor: zoom-out;
}
#lb-overlay.is-open { display: flex; }
#lb-overlay img {
  max-width: 96vw;
  max-height: 96vh;
  width: auto;
  height: auto;
  object-fit: contain;
  box-shadow: 0 0 24px #000;
}