.lightbox {
  display: none;
  position: fixed;
  z-index: 2000;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.92);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  transition: opacity var(--transition);
}
.lightbox[open], .lightbox.active {
  display: flex;
  animation: fadeIn 0.3s;
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.lightbox-image {
  max-width: 90vw;
  max-height: 70vh;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 1rem;
  background: var(--bg-light);
}
.lightbox-caption {
  color: var(--text);
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
  text-align: center;
  max-width: 80vw;
}
.lightbox-close, .lightbox-prev, .lightbox-next, .lightbox-download {
  position: absolute;
  background: var(--bg-color);
  border: 2px solid var(--accent);
  color: var(--accent);
  font-size: 2rem;
  border-radius: 50%;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border var(--transition);
  z-index: 10;
}
.lightbox-close {
  top: 2rem;
  right: 2rem;
  font-size: 2.2rem;
}
.lightbox-prev {
  top: 50%;
  left: 2rem;
  transform: translateY(-50%);
}
.lightbox-next {
  top: 50%;
  right: 2rem;
  transform: translateY(-50%);
}
.lightbox-download {
  bottom: 2rem;
  right: 2rem;
  font-size: 1.5rem;
}
.lightbox-close:hover, .lightbox-prev:hover, .lightbox-next:hover, .lightbox-download:hover {
  background: var(--accent);
  color: var(--bg-light);
  border-color: var(--accent);
}
@media (max-width: 768px) {
  .lightbox-image {
    max-width: 98vw;
    max-height: 50vh;
  }
  .lightbox-close, .lightbox-prev, .lightbox-next, .lightbox-download {
    width: 2rem;
    height: 2rem;
    font-size: 1.3rem;
  }
}