.lb-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.88);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  cursor: zoom-out;
  opacity: 0;
  transition: opacity 0.18s ease;
}
.lb-overlay.lb-open {
  display: flex;
  opacity: 1;
}
.lb-overlay img {
  max-width: 95vw;
  max-height: 95vh;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
  cursor: default;
  user-select: none;
}
.lb-btn {
  position: absolute;
  background: none;
  border: 0;
  color: #fff;
  cursor: pointer;
  font-family: sans-serif;
  opacity: 0.75;
  transition: opacity 0.15s;
  padding: 10px 18px;
}
.lb-btn:hover { opacity: 1; }
.lb-close { top: 12px; right: 18px; font-size: 38px; line-height: 1; }
.lb-nav   { top: 50%; transform: translateY(-50%); font-size: 52px; line-height: 1; }
.lb-prev { left: 8px; }
.lb-next { right: 8px; }

@media (max-width: 600px) {
  .lb-nav { font-size: 38px; padding: 8px 12px; }
}