/* 全课程配图点击放大 */
.lesson-img-lightbox {
  position: fixed;
  inset: 0;
  z-index: 100001;
  background: rgba(15, 23, 42, 0.94);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: max(12px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right))
    max(12px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
  cursor: zoom-out;
}

.lesson-img-lightbox[hidden] {
  display: none !important;
}

.lesson-img-lightbox-img {
  max-width: min(96vw, 1400px);
  max-height: 92vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.45);
  cursor: default;
  user-select: none;
}

.lesson-img-lightbox-close {
  position: fixed;
  top: max(10px, env(safe-area-inset-top));
  right: max(14px, env(safe-area-inset-right));
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.95);
  color: #1e293b;
  font-size: 1.6rem;
  font-weight: 900;
  cursor: pointer;
  line-height: 1;
  z-index: 100002;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.lesson-img-lightbox-close:active {
  transform: scale(0.96);
}

.lesson-img-lightbox-caption {
  position: fixed;
  bottom: max(12px, env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  max-width: 90vw;
  padding: 0.35rem 0.75rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  font-weight: 700;
  font-size: 0.86rem;
  color: #334155;
  text-align: center;
  margin: 0;
  z-index: 100002;
}

.lesson-img-lightbox-caption[hidden] {
  display: none !important;
}

img.lesson-img-zoomable {
  cursor: zoom-in;
}

img.lesson-img-zoomable:focus-visible {
  outline: 3px solid #38bdf8;
  outline-offset: 2px;
}