/**
 * l15 · 配图位随图片原始比例自适应（无图占位仍为 4:3）
 */
@import url("assets/lesson-image-lightbox.css");

#l15-book {
  --l15-img-ratio: 4 / 3;
  --l15-img-max-h: min(64vh, 520px);
}

/* 左图右文 */
#l15-book .panel.panel-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.65rem;
  align-items: start;
}
@media (min-width: 640px) {
  #l15-book .panel.panel-split {
    grid-template-columns: minmax(200px, 48%) 1fr;
    gap: 0.75rem;
  }
}

/* 配图框：通用外观（比例由内部图片决定，不强制 4:3） */
#l15-book .scene-frame,
#l15-book [class*="scene-frame--"],
#l15-book .panel.panel-split .scene-frame,
#l15-book .panel.panel-split [class*="scene-frame--"],
#l15-book .scene-carousel .scene-frame,
#l15-book .scene-stage .scene-frame,
#l15-book .scene-frame--story {
  position: relative;
  box-sizing: border-box;
  width: 100% !important;
  height: auto !important;
  min-height: 0 !important;
  padding: 0 !important;
  margin: 0;
  flex: 0 0 auto !important;
  align-self: start;
  border-radius: 10px 14px 8px 12px;
  border: 2px solid var(--edge, #5d4037);
  background: #e8eef4 !important;
  overflow: hidden;
}

/* 压过 lesson-screen-16x9 对 L15 的固定 4:3 */
#l15-book .panel-split .scene-frame:has(img),
#l15-book .panel-split [class*="scene-frame--"]:has(img) {
  aspect-ratio: auto !important;
  max-height: none !important;
}

#l15-book .scene-frame:has(img),
#l15-book [class*="scene-frame--"]:has(img),
#l15-book .scene-frame--story:has(img) {
  display: block !important;
  aspect-ratio: auto !important;
  max-height: none !important;
}

/* 无图占位（保留 4:3） */
#l15-book .scene-frame:not(:has(img)),
#l15-book .scene-frame--passage:not(:has(img)),
#l15-book [class*="scene-frame--"]:not(:has(img)) {
  aspect-ratio: var(--l15-img-ratio) !important;
  max-height: min(58vh, calc(100vw * 3 / 4)) !important;
  display: flex !important;
  align-items: center;
  justify-content: center;
  padding: 0.75rem !important;
  text-align: center;
  font-weight: 900;
  line-height: 1.35;
  color: #f8fafc;
  background: linear-gradient(145deg, #0f172a, #1e3a5f) !important;
}

/* 图片：按原始宽高比显示，框随图片收缩 */
#l15-book .scene-frame img,
#l15-book [class*="scene-frame--"] img,
#l15-book .scene-frame--story img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100% !important;
  height: auto !important;
  max-width: 100% !important;
  max-height: var(--l15-img-max-h) !important;
  margin: 0;
  padding: 0;
  aspect-ratio: auto;
  object-fit: contain !important;
  object-position: center center;
  cursor: zoom-in;
  vertical-align: top;
}

/* 语料缩略图：框随图片比例 */
#l15-book .corpus-fig {
  position: relative;
  margin: 0;
  width: 100%;
  height: auto;
  aspect-ratio: auto !important;
  padding: 0;
  border-radius: 10px;
  overflow: hidden;
  border: 2px solid #e2e8f0;
  background: #e8eef4;
  align-self: start;
}
#l15-book .corpus-fig img {
  position: relative;
  display: block;
  width: 100% !important;
  height: auto !important;
  max-width: 100% !important;
  max-height: min(40vh, 360px) !important;
  aspect-ratio: auto;
  object-fit: contain !important;
  object-position: center;
  background: #e8eef4;
  cursor: zoom-in;
  vertical-align: top;
}

/* 点击放大：预览区跟随图片原始比例 */
.lesson-img-lightbox-img {
  aspect-ratio: auto;
  width: auto;
  height: auto;
  max-width: min(96vw, 1400px);
  max-height: 92vh;
  object-fit: contain;
}