:root {
  --bg-dark: #0c1017;
  --bg-card: #151c27;
  --bg-card-hover: #1f293a;
  --bg-card-active: rgba(214, 48, 49, 0.16);
  --truku-red: #d63031;
  --truku-red-glow: rgba(214, 48, 49, 0.45);
  --truku-gold: #f39c12;
  --text-white: #fdfbf7;
  --text-dim: #94a3b8;
  --text-truku: #e2e8f0;
  --text-zh: #cbd5e1;
  --border-card: #283347;
  --border-active: #d63031;
  
  /* 字體大小變數 (可由學習工具即時動態縮放) */
  --sub-truku-size: 16px;
  --sub-zh-size: 14px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft JhengHei", "PingFang TC", Roboto, sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-white);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.5;
}

/* 主工作區 (Desktop 雙欄並排 / Mobile 垂直鎖定) */
main {
  max-width: 1680px;
  margin: 0 auto;
  padding: 16px 16px 48px;
}

.theater-workspace {
  display: grid;
  grid-template-columns: 1fr 480px;
  gap: 24px;
  align-items: start;
}

/* ============================================================
   播放器區塊：手機端固定置頂核心技術 (Sticky Top)
   ============================================================ */
.player-section {
  position: relative;
}

.player-wrapper {
  background: #000;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 14px 36px rgba(0,0,0,0.6);
  border: 1px solid var(--border-card);
}

.video-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
}

video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  background: #000;
}

/* 浮動單句循環提示標籤 */
.loop-indicator {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(214, 48, 49, 0.92);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  backdrop-filter: blur(4px);
  box-shadow: 0 2px 10px rgba(0,0,0,0.5);
  display: none;
  align-items: center;
  gap: 4px;
  animation: pulseLoop 1.5s infinite ease-in-out;
  pointer-events: none;
  z-index: 10;
}

.loop-indicator.active {
  display: flex;
}

@keyframes pulseLoop {
  0%, 100% { transform: scale(1); opacity: 0.95; }
  50% { transform: scale(1.06); opacity: 1; }
}

/* 播放資訊卡 */
.player-info-card {
  padding: 14px 18px;
  background: var(--bg-card);
  border-top: 1px solid var(--border-card);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.info-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.meta-badge-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.ep-code-pill {
  background: var(--truku-red);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 6px;
  white-space: nowrap;
}

.duration-pill {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-dim);
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 6px;
  white-space: nowrap;
}

.badge.qhd {
  background: #27ae60;
  border: 1px solid #2ecc71;
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
  white-space: nowrap;
  box-shadow: 0 0 10px rgba(39, 174, 96, 0.35);
}

.active-speed-pill {
  background: rgba(243, 156, 18, 0.2);
  border: 1px solid var(--truku-gold);
  color: var(--truku-gold);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 6px;
  white-space: nowrap;
}

.now-title {
  font-size: 18px;
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
}

.now-truku {
  font-size: 13px;
  color: var(--truku-gold);
  font-style: italic;
  line-height: 1.3;
}

/* 控制列按鈕 */
.player-controls-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.ctrl-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-card);
  color: #cbd5e1;
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  transition: all 0.2s;
  flex: 1 1 auto;
  justify-content: center;
}

.ctrl-btn:hover {
  background: var(--bg-card-hover);
  color: #fff;
  border-color: var(--truku-gold);
}

.ctrl-btn.active {
  background: var(--truku-red);
  color: #fff;
  border-color: var(--truku-red);
  box-shadow: 0 0 10px var(--truku-red-glow);
}

/* ============================================================
   右側/下方：多功能標籤分頁面板
   ============================================================ */
.interactive-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
  min-height: 600px;
}

/* 分頁切換列 */
.panel-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: #0f141d;
  border-bottom: 1px solid var(--border-card);
}

.tab-item {
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--text-dim);
  padding: 12px 6px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 600;
  transition: all 0.2s;
  white-space: nowrap;
}

.tab-item:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.03);
}

.tab-item.active {
  color: #fff;
  border-bottom-color: var(--truku-red);
  background: rgba(214, 48, 49, 0.08);
}

.tab-icon {
  font-size: 16px;
}

.tab-count {
  font-size: 10px;
  background: rgba(255, 255, 255, 0.1);
  padding: 1px 5px;
  border-radius: 10px;
  color: var(--truku-gold);
}

/* 分頁內容容器 */
.tab-view {
  display: none;
  flex: 1;
  flex-direction: column;
}

.tab-view.active {
  display: flex;
}

/* ------------------------------------------------------------
   分頁 1：逐句同步字幕 (Karaoke)
   ------------------------------------------------------------ */
.sub-toolbar {
  padding: 10px 16px;
  background: #111721;
  border-bottom: 1px solid var(--border-card);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.sub-notice {
  font-size: 12px;
  color: var(--truku-gold);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.sub-filters {
  display: flex;
  gap: 6px;
  flex-wrap: nowrap;
}

.filter-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #94a3b8;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.filter-btn.active {
  background: var(--truku-red);
  color: #fff;
  border-color: var(--truku-red);
}

/* 獨立容器內滾動 (徹底修復 window 誤滾動問題) */
.sub-scroll-container {
  flex: 1;
  overflow-y: auto;
  max-height: 560px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

.sub-scroll-container::-webkit-scrollbar {
  width: 6px;
}
.sub-scroll-container::-webkit-scrollbar-thumb {
  background: #2a3547;
  border-radius: 4px;
}

/* 字幕卡片 */
.sub-clause-card {
  background: rgba(255, 255, 255, 0.03);
  border-left: 3px solid transparent;
  border-radius: 8px;
  padding: 10px 12px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 5px;
  position: relative;
}

.sub-clause-card:hover {
  background: rgba(255, 255, 255, 0.06);
}

.sub-clause-card.active {
  background: var(--bg-card-active);
  border-left: 3px solid var(--truku-red);
  box-shadow: 0 2px 12px rgba(214, 48, 49, 0.25);
}

.clause-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.clause-time {
  font-size: 11px;
  color: var(--truku-gold);
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 4px;
}

.clause-actions {
  display: flex;
  gap: 6px;
}

.clause-mini-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-dim);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 10px;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.clause-mini-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.clause-truku {
  font-size: var(--sub-truku-size);
  font-weight: 600;
  color: var(--text-truku);
  font-style: italic;
  line-height: 1.4;
}

.clause-zh {
  font-size: var(--sub-zh-size);
  color: var(--text-zh);
  line-height: 1.4;
}

/* ------------------------------------------------------------
   分頁 2：全系列章節選集 (Tg1 ～ Tg7)
   ------------------------------------------------------------ */
.episodes-view-header {
  padding: 14px 16px;
  background: #111721;
  border-bottom: 1px solid var(--border-card);
}

.episodes-view-header h3 {
  font-size: 15px;
  color: #fff;
  font-weight: 700;
}

.episodes-view-header p {
  font-size: 12px;
  color: var(--text-dim);
}

.episodes-list-grid {
  flex: 1;
  overflow-y: auto;
  max-height: 560px;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ep-item-card {
  background: #111722;
  border: 1px solid var(--border-card);
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  transition: all 0.25s ease;
  display: flex;
  gap: 12px;
}

.ep-item-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--truku-gold);
}

.ep-item-card.active {
  border-color: var(--truku-red);
  background: rgba(214, 48, 49, 0.1);
  box-shadow: 0 0 0 1px var(--truku-red);
}

.ep-thumb-wrap {
  width: 130px;
  aspect-ratio: 16 / 9;
  position: relative;
  background: #000;
  flex-shrink: 0;
}

.ep-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.ep-code-badge {
  position: absolute;
  top: 6px;
  left: 6px;
  background: var(--truku-red);
  color: #fff;
  font-size: 11px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 4px;
}

.ep-duration-badge {
  position: absolute;
  bottom: 6px;
  right: 6px;
  background: rgba(0,0,0,0.8);
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 5px;
  border-radius: 3px;
}

.ep-item-info {
  padding: 10px 10px 10px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  flex: 1;
}

.ep-item-title {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
}

.ep-item-truku {
  font-size: 12px;
  color: var(--truku-gold);
  font-style: italic;
}

.ep-item-desc {
  font-size: 11px;
  color: var(--text-dim);
  line-height: 1.4;
  margin-top: 2px;
}

/* ------------------------------------------------------------
   分頁 3：學習工具箱
   ------------------------------------------------------------ */
.tools-container {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  overflow-y: auto;
  max-height: 560px;
}

.tool-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: #111722;
  border: 1px solid var(--border-card);
  padding: 14px 16px;
  border-radius: 12px;
}

.tool-label {
  font-size: 13px;
  font-weight: 700;
  color: #fff;
}

.tool-btn-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 8px;
}

.tool-choice-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-card);
  color: #cbd5e1;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  text-align: center;
  transition: all 0.2s;
}

.tool-choice-btn:hover {
  background: var(--bg-card-hover);
  color: #fff;
}

.tool-choice-btn.active {
  background: var(--truku-red);
  border-color: var(--truku-red);
  color: #fff;
  box-shadow: 0 0 10px var(--truku-red-glow);
}

.toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.toggle-desc strong {
  font-size: 13px;
  color: #fff;
  display: block;
}

.toggle-desc p {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 2px;
  line-height: 1.4;
}

.toggle-switch-btn {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-card);
  color: #94a3b8;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all 0.2s;
}

.toggle-switch-btn.active {
  background: #27ae60;
  border-color: #2ecc71;
  color: #fff;
  box-shadow: 0 0 10px rgba(39, 174, 96, 0.4);
}

/* ------------------------------------------------------------
   分頁 4：劇本來源與使用技術完整說明 (Source & Tech Tab)
   ------------------------------------------------------------ */
.source-tech-container {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
  max-height: 560px;
}

.tech-spec-card {
  background: #111722;
  border: 1px solid var(--border-card);
  border-radius: 12px;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.spec-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.spec-icon {
  font-size: 26px;
  flex-shrink: 0;
}

.spec-header h3 {
  font-size: 15px;
  color: #fff;
  font-weight: 700;
  line-height: 1.3;
}

.spec-tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  color: var(--truku-gold);
  background: rgba(243, 156, 18, 0.12);
  border: 1px solid rgba(243, 156, 18, 0.3);
  padding: 1px 6px;
  border-radius: 4px;
  margin-top: 2px;
}

.spec-content {
  font-size: 12.5px;
  color: #cbd5e1;
  line-height: 1.65;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.spec-content strong {
  color: #fff;
}

/* 浮動提示 Toast */
.toast-notice {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid var(--truku-gold);
  color: #fff;
  padding: 8px 18px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 6px 20px rgba(0,0,0,0.6);
  z-index: 9999;
  opacity: 0;
  transition: all 0.3s ease;
  pointer-events: none;
}

.toast-notice.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ============================================================
   頁尾技術規格告示 (Footer Specs Grid)
   ============================================================ */
footer {
  background: #080b10;
  border-top: 1px solid var(--border-card);
  padding: 32px 20px 24px;
  color: var(--text-dim);
  font-size: 12px;
  margin-top: 40px;
}

.footer-specs-grid {
  max-width: 1400px;
  margin: 0 auto 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  text-align: left;
}

.spec-col {
  background: #0d121a;
  border: 1px solid var(--border-card);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.spec-col h4 {
  color: #ff7675;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 2px;
}

.spec-col p {
  color: #94a3b8;
  font-size: 11.5px;
  line-height: 1.55;
}

.footer-bottom-line {
  max-width: 1000px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-bottom-line strong {
  color: #fff;
  font-size: 13px;
}

.tech-tag {
  color: #64748b;
  font-size: 11px;
}

/* ============================================================
   行動裝置優化：核心鎖定視訊畫面 (Mobile Sticky Rules)
   ============================================================ */
@media (max-width: 1024px) {
  main {
    padding: 0 0 32px 0;
  }

  .theater-workspace {
    grid-template-columns: 1fr;
    gap: 0;
  }

  /* 播放器容器在手機端 100% 固定頂部！ */
  .player-section {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--bg-dark);
    box-shadow: 0 4px 20px rgba(0,0,0,0.75);
  }

  .player-wrapper {
    border-radius: 0;
    border-left: none;
    border-right: none;
    border-top: none;
  }

  .video-container {
    max-height: 40vh;
  }

  .player-info-card {
    padding: 10px 14px;
    gap: 8px;
  }

  .now-title {
    font-size: 15px;
  }

  .now-truku {
    font-size: 12px;
  }

  .ctrl-btn {
    padding: 6px 10px;
    font-size: 12px;
  }

  .interactive-panel {
    border-radius: 0;
    border-left: none;
    border-right: none;
    border-bottom: none;
    min-height: auto;
  }

  .sub-scroll-container,
  .episodes-list-grid,
  .tools-container,
  .source-tech-container {
    max-height: calc(100vh - 40vh - 120px);
  }

  .footer-specs-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}