.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.lightbox-img {
  max-width: 90%;
  max-height: 85%;
  border-radius: 10px;
  transition: opacity 0.2s ease;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 30px;
  font-size: 32px;
  color: white;
  background: none;
  border: none;
  cursor: pointer;
}

.lightbox-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 30px;
  color: white;
  background: rgba(255,255,255,0.1);
  border: none;
  padding: 10px 15px;
  cursor: pointer;
}

.lightbox-btn.left { left: 20px; }
.lightbox-btn.right { right: 20px; }