/**
 * L13 Page 05 · 故事拼图（对齐 Page 03/04：全屏铺满、无滚动练习区）
 */

#l13-book .panel.panel-split {
  display: grid !important;
  grid-template-columns: 1fr;
  gap: 0.65rem;
  align-items: stretch;
  min-height: 0;
  overflow: hidden;
}
@media (min-width: 640px) {
  #l13-book .panel.panel-split {
    grid-template-columns: minmax(220px, 48%) 1fr;
    gap: 0.85rem;
  }
}

#l13-book .panel.panel-split .stage-visual,
#l13-book .panel.panel-split .stage-body {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

#l13-book .panel.panel-split .stage-body {
  gap: 0.4rem;
}

#l13-book .scene-frame--intro,
#l13-book .scene-frame--split {
  flex: 1 1 auto;
  width: 100%;
  aspect-ratio: 4 / 3;
  min-height: clamp(200px, 36vh, 460px);
  max-height: min(64vh, 520px) !important;
  height: auto !important;
  background: linear-gradient(145deg, #fff1f2, #ffe4e6);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 12px 18px 10px 16px;
  border: 3px solid var(--edge, #5d4037);
}

#l13-book .scene-frame--intro img,
#l13-book .scene-frame--split img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center center;
}

#l13-book .panel-lead {
  font-weight: 800;
  margin: 0 0 0.25rem;
  line-height: 1.42;
  flex-shrink: 0;
  font-size: clamp(0.9rem, 1.15vw + 0.45rem, 1.08rem);
}

#l13-book .tier-label {
  background: var(--rose-bg, #ffe4e6);
  color: var(--rose-ink, #9f1239);
}
#l13-book .tier-label.tier-c {
  background: #fef3c7;
  color: #92400e;
}

#l13-book .rule-box.rose {
  background: var(--rose-bg, #ffe4e6);
  border-left: 5px solid var(--rose, #e11d48);
  color: var(--rose-ink, #9f1239);
  flex-shrink: 0;
}
#l13-book .rule-box.violet {
  background: var(--perf-bg, #ede9fe);
  border-left: 5px solid var(--perf, #6d28d9);
  color: #4c1d95;
  flex-shrink: 0;
}

#l13-book .hl-had {
  background: var(--perf-bg, #ede9fe);
  color: var(--perf, #6d28d9);
  padding: 0 0.12rem;
  border-radius: 4px;
  font-weight: 900;
}

#l13-book .btn.rose {
  background: linear-gradient(135deg, #fb7185, #e11d48);
  color: #fff;
  border-color: #9f1239;
  box-shadow: 0 3px 0 rgba(159, 18, 57, 0.28);
}

#l13-book .lesson-page.active > .panel:not(.panel-split) {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#l13-book .lesson-page.active > .panel.panel-split {
  flex: 1 1 auto;
  min-height: 0;
}

#l13-book .lesson-page .btn-row {
  flex-shrink: 0;
  margin-top: auto;
  padding-top: 0.35rem;
}

/* 屏 1 · 封面全屏 */
#l13-book .panel-intro-story {
  display: flex;
  flex-direction: column;
  min-height: 0;
  flex: 1 1 auto;
  overflow: hidden;
}
#l13-book .panel-intro-story .scene-frame--intro {
  flex: 1 1 auto;
  max-height: none !important;
  min-height: min(72vh, 640px);
  aspect-ratio: auto;
}

/* 屏 2 · 背景 + 人物 */
#l13-book .museum-scene-caption {
  flex-shrink: 0;
  font-size: clamp(0.85rem, 1.1vw + 0.38rem, 1rem);
  font-weight: 700;
  color: #64748b;
  text-align: center;
  margin: 0.2rem 0 0;
}

#l13-book .museum-scene-nav {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  width: 100%;
  margin-top: 0.15rem;
}

#l13-book .museum-scene-progress {
  font-weight: 900;
  font-size: clamp(0.85rem, 1.1vw + 0.38rem, 1rem);
  color: var(--rose-ink, #9f1239);
}

#l13-book .museum-scene-btns {
  margin-top: 0 !important;
  padding-top: 0 !important;
  justify-content: center;
  width: 100%;
}

#l13-book .char-grid {
  display: grid;
  gap: clamp(0.2rem, 0.5vh, 0.35rem);
  flex: 1 1 auto;
  min-height: 0;
  align-content: stretch;
}
@media (min-width: 480px) {
  #l13-book .char-grid {
    grid-template-columns: 1fr 1fr;
    grid-auto-rows: 1fr;
  }
}

#l13-book .char-card {
  display: flex;
  align-items: center;
  min-height: 0;
  padding: clamp(0.3rem, 0.85vh, 0.5rem) clamp(0.35rem, 1vw, 0.55rem);
  border-radius: 10px;
  border: 2px solid #fecdd3;
  background: #fff;
  font-weight: 700;
  font-size: clamp(0.88rem, 1.1vw + 0.42rem, 1.05rem);
  line-height: 1.38;
}
#l13-book .char-card strong {
  color: var(--rose-ink, #9f1239);
}

#l13-book .story-synopsis {
  flex-shrink: 0;
  font-size: clamp(0.9rem, 1.15vw + 0.45rem, 1.08rem);
  font-weight: 700;
  margin: 0 0 0.25rem;
  line-height: 1.42;
}

/* 屏 3 · 拼图排序 */
#l13-book .lesson-page[data-page="3"].active > .panel.panel-sort-task {
  overflow: hidden;
}
#l13-book .panel-sort-task {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  gap: 0.25rem;
}
#l13-book #sort-list {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(0.18rem, 0.45vh, 0.32rem);
  margin: 0;
  overflow: hidden;
}
#l13-book .sort-item {
  flex: 1 1 0;
  min-height: 0;
  display: flex;
  align-items: center;
  gap: clamp(0.25rem, 0.6vw, 0.4rem);
  padding: clamp(0.22rem, 0.65vh, 0.38rem) clamp(0.3rem, 0.8vw, 0.45rem);
  border-radius: 10px;
  border: 2px solid var(--edge, #5d4037);
  background: #fff;
  cursor: grab;
  touch-action: manipulation;
  overflow: hidden;
}
#l13-book .sort-item.dragging {
  opacity: 0.55;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}
#l13-book .sort-item .num {
  flex: 0 0 1.75rem;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: clamp(0.88rem, 1.1vw + 0.38rem, 1rem);
  color: var(--rose-ink, #9f1239);
  background: var(--rose-bg, #ffe4e6);
  border-radius: 8px;
  align-self: stretch;
}
#l13-book .sort-item .text {
  flex: 1 1 auto;
  min-width: 0;
  font-weight: 800;
  font-size: clamp(0.95rem, 1.2vw + 0.5rem, 1.15rem);
  line-height: 1.36;
  overflow: hidden;
}
#l13-book .sort-item .had-tag {
  flex-shrink: 0;
  font-size: clamp(0.78rem, 0.95vw + 0.32rem, 0.92rem);
  font-weight: 900;
  padding: 0.12rem 0.4rem;
  border-radius: 6px;
  background: var(--perf-bg, #ede9fe);
  color: var(--perf, #6d28d9);
}
#l13-book .sort-ctrl {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
#l13-book .sort-ctrl button {
  width: 2rem;
  height: clamp(26px, 3.5vh, 32px);
  border: 2px solid var(--edge, #5d4037);
  border-radius: 6px;
  background: #f8fafc;
  font-weight: 900;
  cursor: pointer;
  font-size: clamp(0.82rem, 1vw + 0.35rem, 0.95rem);
  font-family: inherit;
  touch-action: manipulation;
}

/* 屏 4 · 提交反馈 */
#l13-book .lesson-page[data-page="4"].active > .panel.panel-timeline-result {
  overflow: hidden;
}
#l13-book .panel-timeline-result {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  gap: 0.25rem;
}
#l13-book .score-banner {
  flex-shrink: 0;
  text-align: center;
  padding: clamp(0.35rem, 1vh, 0.55rem);
  border-radius: 12px;
  font-weight: 900;
  font-size: clamp(1rem, 1.5vw + 0.5rem, 1.28rem);
  margin: 0;
}
#l13-book .score-banner.ok {
  background: var(--ok-bg, #ecfdf5);
  color: var(--ok, #047857);
  border: 3px solid var(--ok, #047857);
}
#l13-book .score-banner.partial {
  background: #fff7ed;
  color: #c2410c;
  border: 3px solid #fb923c;
}

/* 屏 4–5 · 时间轴 */
#l13-book .timeline-v {
  flex: 1 1 auto;
  min-height: 0;
  display: grid;
  grid-template-columns: 1fr;
  grid-auto-rows: 1fr;
  gap: clamp(0.15rem, 0.4vh, 0.28rem);
  margin: 0;
  padding: 0;
  border-left: none;
  overflow: hidden;
}
@media (min-width: 720px) {
  #l13-book .timeline-v {
    grid-template-columns: 1fr 1fr;
  }
}
#l13-book .tl-node {
  position: relative;
  margin: 0;
  padding: clamp(0.22rem, 0.65vh, 0.38rem) clamp(0.3rem, 0.7vw, 0.45rem);
  border-radius: 10px;
  border: 2px solid #e2e8f0;
  background: #fff;
  cursor: pointer;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow: hidden;
}
#l13-book .tl-node::before {
  display: none;
}
#l13-book .tl-node.perf {
  border-color: #c4b5fd;
  background: #faf5ff;
}
#l13-book .tl-node.active {
  outline: 3px solid var(--rose, #e11d48);
}
#l13-book .tl-node .en-line {
  margin: 0;
  font-size: clamp(0.95rem, 1.2vw + 0.48rem, 1.15rem);
  line-height: 1.36;
}
#l13-book .tl-node .zh-hint {
  margin: 0.1rem 0 0;
  font-size: clamp(0.88rem, 1.05vw + 0.42rem, 1.05rem);
  line-height: 1.35;
}
#l13-book .tl-node .tl-label {
  display: none;
  margin-top: 0.15rem;
  font-size: clamp(0.82rem, 0.95vw + 0.38rem, 0.95rem);
  font-weight: 800;
  color: var(--rose-ink, #9f1239);
  line-height: 1.25;
}
#l13-book .tl-node.active .tl-label {
  display: block;
}

/* 屏 5 · 探索时间轴 */
#l13-book .lesson-page[data-page="5"].active > .panel.panel-timeline-explore {
  overflow: hidden;
}
#l13-book .panel-timeline-explore {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  gap: 0.25rem;
}
#l13-book .fb-panel {
  flex-shrink: 0;
  margin: 0;
  padding: clamp(0.35rem, 0.9vh, 0.5rem);
  border-radius: 10px;
  background: #f8fafc;
  border: 2px solid #e2e8f0;
  font-weight: 700;
  font-size: clamp(0.9rem, 1.15vw + 0.45rem, 1.08rem);
  min-height: clamp(52px, 10vh, 80px);
  line-height: 1.4;
}

/* 屏 6 · 谁先发生 */
#l13-book .lesson-page[data-page="6"].active > .panel.panel-first-quiz {
  overflow: hidden;
}
#l13-book .panel-first-quiz {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}
#l13-book #first-quiz {
  display: grid;
  grid-template-columns: 1fr;
  grid-auto-rows: 1fr;
  gap: clamp(0.2rem, 0.5vh, 0.35rem);
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}
@media (min-width: 720px) {
  #l13-book #first-quiz {
    grid-template-columns: 1fr 1fr;
  }
}
#l13-book #first-quiz .quiz-item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 0;
  margin: 0;
  padding: clamp(0.22rem, 0.7vh, 0.4rem) clamp(0.35rem, 1vw, 0.5rem);
  border-radius: 10px;
  border: 2px solid #e2e8f0;
  background: #fff;
  overflow: hidden;
}
#l13-book #first-quiz .quiz-item.done {
  border-color: var(--ok, #047857);
  background: var(--ok-bg, #ecfdf5);
}
#l13-book #first-quiz .quiz-stem {
  font-weight: 800;
  margin: 0 0 0.12rem;
  font-size: clamp(0.95rem, 1.2vw + 0.48rem, 1.12rem);
  line-height: 1.36;
}
#l13-book #first-quiz .opt-row {
  display: flex;
  flex-direction: column;
  gap: clamp(0.12rem, 0.35vh, 0.22rem);
  margin: 0;
}
#l13-book #first-quiz .opt-row button {
  min-height: clamp(36px, 5vh, 44px);
  padding: clamp(0.28rem, 0.6vh, 0.4rem) 0.5rem;
  border-radius: 8px;
  font-size: clamp(0.88rem, 1.05vw + 0.42rem, 1.05rem);
  line-height: 1.32;
  text-align: left;
  white-space: normal;
  word-break: break-word;
}
#l13-book #first-quiz .quiz-item .fb:empty {
  display: none;
}
#l13-book #first-quiz .quiz-item .fb {
  font-size: clamp(0.82rem, 0.95vw + 0.38rem, 0.95rem);
  margin-top: 0.1rem;
}

/* 屏 7 · 改词 */
#l13-book .lesson-page[data-page="7"].active > .panel.panel-fix-words {
  overflow: hidden;
}
#l13-book .panel-fix-words {
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  gap: 0.25rem;
}
#l13-book #fix-box {
  display: grid;
  grid-template-columns: 1fr;
  grid-auto-rows: 1fr;
  gap: clamp(0.2rem, 0.5vh, 0.35rem);
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}
@media (min-width: 900px) {
  #l13-book #fix-box {
    grid-template-columns: 1fr 1fr 1fr;
  }
}
#l13-book .fix-item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 0;
  margin: 0;
  padding: clamp(0.28rem, 0.8vh, 0.45rem) clamp(0.35rem, 1vw, 0.5rem);
  border-radius: 10px;
  border: 2px solid #fde68a;
  background: #fffbeb;
  overflow: hidden;
}
#l13-book .fix-item.done {
  border-color: var(--ok, #047857);
  background: var(--ok-bg, #ecfdf5);
}
#l13-book .fix-item .fix-stem {
  font-weight: 800;
  margin: 0 0 0.12rem;
  font-size: clamp(0.92rem, 1.15vw + 0.45rem, 1.08rem);
  line-height: 1.36;
}
#l13-book .fix-opts {
  display: flex;
  flex-wrap: nowrap;
  gap: clamp(0.12rem, 0.35vh, 0.22rem);
}
#l13-book .fix-opts button {
  flex: 1 1 0;
  min-width: 0;
  min-height: clamp(36px, 5vh, 44px);
  padding: 0.28rem 0.45rem;
  border-radius: 999px;
  border: 2px solid #cbd5e1;
  background: #fff;
  font-weight: 800;
  font-size: clamp(0.88rem, 1.05vw + 0.42rem, 1.05rem);
  cursor: pointer;
  font-family: inherit;
  touch-action: manipulation;
}
#l13-book .fix-opts button.ok {
  background: var(--ok-bg, #ecfdf5);
  border-color: var(--ok, #047857);
}
#l13-book .fix-item .fb:empty {
  display: none;
}
#l13-book .fix-item .fb {
  font-size: clamp(0.82rem, 0.95vw + 0.38rem, 0.95rem);
  margin-top: 0.1rem;
  color: var(--rose-ink, #9f1239);
}

/* 屏 8 · 通道 */
#l13-book .panel-channel {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  flex: 1 1 auto;
  min-height: 0;
}
#l13-book .channel-btn {
  display: block;
  width: 100%;
  max-width: 420px;
  margin: 0.5rem auto 0;
  min-height: 56px;
  padding: 0.85rem 1rem;
  border-radius: 14px;
  border: 3px solid var(--edge, #5d4037);
  font-weight: 900;
  font-size: clamp(1.05rem, 1.35vw + 0.55rem, 1.28rem);
  text-align: center;
  text-decoration: none;
  color: var(--rose-ink, #9f1239);
  background: linear-gradient(135deg, #fecdd3, #fda4af);
  box-sizing: border-box;
}
#l13-book .panel-channel .channel-links {
  margin-top: 0.75rem;
  font-size: clamp(0.9rem, 1.1vw + 0.45rem, 1.08rem);
  font-weight: 700;
  color: #64748b;
}
#l13-book .panel-channel .channel-links a {
  color: var(--rose-ink, #9f1239);
  font-weight: 900;
}

#l13-book .fb {
  color: var(--rose-ink, #9f1239);
  font-weight: 700;
}

#l13-book .opt-row button.ok {
  background: var(--ok-bg, #ecfdf5);
  border-color: var(--ok, #047857);
}
#l13-book .opt-row button.bad {
  background: var(--bad-bg, #fef2f2);
  border-color: var(--bad, #b91c1c);
}