.lb-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.85);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.25s;
}
.lb-overlay.active { opacity: 1; }
.lb-close {
  position: absolute;
  top: 15px; right: 20px;
  color: #fff;
  font-size: 32px;
  cursor: pointer;
  z-index: 10001;
  line-height: 1;
  opacity: 0.7;
  transition: opacity 0.2s;
}
.lb-close:hover { opacity: 1; }
.lb-prev, .lb-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: #fff;
  font-size: 44px;
  cursor: pointer;
  z-index: 10001;
  user-select: none;
  opacity: 0.6;
  transition: opacity 0.2s;
  padding: 20px;
}
.lb-prev:hover, .lb-next:hover { opacity: 1; }
.lb-prev { left: 10px; }
.lb-next { right: 10px; }
.lb-img-wrap {
  max-width: calc(100% - 140px);
  max-height: calc(100% - 60px);
  position: relative;
}
.lb-img-wrap img {
  max-width: 100%;
  max-height: calc(100vh - 80px);
  display: block;
  border-radius: 3px;
  box-shadow: 0 4px 30px rgba(0,0,0,0.5);
}
.lb-caption {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  background: rgba(0,0,0,0.6);
  color: #fff;
  padding: 8px 12px;
  font-size: 13px;
  border-radius: 0 0 3px 3px;
}
.lb-counter {
  position: absolute;
  top: 18px; left: 20px;
  color: rgba(255,255,255,0.5);
  font-size: 13px;
  z-index: 10001;
}