.lightbox {
  display: none;
  position: fixed;
  z-index: 2000;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0,0,0,0.8);
  justify-content: center;
  align-items: center;
}
.lightbox img {
  max-width: 90%;
  max-height: 90%;
  border-radius: 12px;
  box-shadow: 0 0 15px rgba(0,0,0,0.5);
  animation: zoom 0.3s ease;
}
@keyframes zoom {
  from { transform: scale(0.7); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}