/* ================================================================
   潮語聖經 朗讀版 — 樣式表
   設計風格：Notion 溫暖極簡主義 + 播放器深色面板
   ================================================================ */

/* ── 設計變量 ── */
:root {
  /* 主色調：溫暖褐金（潮汕傳統色彩） */
  --accent:        #B8773A;
  --accent-hover:  #9A6128;
  --accent-light:  #F5ECD7;
  --accent-glow:   rgba(184, 119, 58, 0.18);

  /* 頁面背景 */
  --bg:            #FFFEF9;
  --surface:       #FFFFFF;
  --surface-2:     #F8F5EF;
  --border:        rgba(0, 0, 0, 0.07);
  --border-hover:  rgba(184, 119, 58, 0.35);

  /* 文字顏色 */
  --text-1:        #1C1512;
  --text-2:        #6B5A47;
  --text-3:        #A0897A;

  /* 深色播放器 */
  --player-bg:     #1A130D;
  --player-border: rgba(255, 255, 255, 0.07);
  --player-text-1: #F5ECD7;
  --player-text-2: #A89078;
  --player-accent: #D4A843;
  --player-track:  rgba(255, 255, 255, 0.12);
  --player-fill:   #D4A843;
  --player-thumb:  #FFFFFF;

  /* 頭部 */
  --header-bg:     #2C2118;
  --header-text:   #F5ECD7;
  --header-sub:    rgba(245, 236, 215, 0.55);

  /* 間距 */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  24px;
  --space-6:  32px;
  --space-7:  48px;

  /* 圓角 */
  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;
  --radius-xl:  20px;

  /* 陰影 */
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.06), 0 0 0 1px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10), 0 1px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.06);

  /* 過渡 */
  --trans-fast: 120ms ease;
  --trans-med:  200ms ease;
  --trans-slow: 300ms ease;

  /* 播放器高度 */
  --player-height: 130px;
  --header-height: 60px;
}

/* ── 重置與基礎 ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: 'PingFang SC', 'Noto Sans CJK SC', 'Microsoft YaHei UI',
               'Hiragino Sans GB', 'Source Han Sans SC', sans-serif;
  background-color: var(--bg);
  color: var(--text-1);
  line-height: 1.6;
  min-height: 100vh;
  padding-top: var(--header-height);
  padding-bottom: calc(var(--player-height) + 20px);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── 頂部欄 ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--header-bg);
  box-shadow: 0 2px 16px rgba(0,0,0,0.3);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.brand-icon svg {
  width: 36px;
  height: 36px;
  display: block;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--header-text);
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.brand-sub {
  font-size: 0.7rem;
  color: var(--header-sub);
  letter-spacing: 0.06em;
}

/* 麵包屑導航 */
.header-nav {
  display: none;
  align-items: center;
  gap: var(--space-2);
  overflow: hidden;
}

.header-nav.visible {
  display: flex;
}

.nav-back-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,0.08);
  color: var(--header-text);
  font-size: 0.8rem;
  cursor: pointer;
  transition: background var(--trans-fast);
  white-space: nowrap;
  min-height: 32px;
}

.nav-back-btn:hover {
  background: rgba(255,255,255,0.16);
}

.nav-sep {
  color: var(--header-sub);
  font-size: 0.8rem;
}

.nav-current {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--header-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── 主內容 ── */
.main-content {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-4);
}

/* 視圖切換 */
.view { display: block; }
.view.hidden { display: none; }

/* ── 書目視圖 ── */
.page-intro {
  text-align: center;
  padding: var(--space-5) 0 var(--space-6);
}

.page-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
}

.page-desc {
  font-size: 0.9rem;
  color: var(--text-3);
}

/* 書目分組 */
.book-group {
  margin-bottom: var(--space-6);
}

.book-group-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--text-3);
  text-transform: uppercase;
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-3);
  border-bottom: 1px solid var(--border);
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-3);
}

/* 書卷卡片 */
.book-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-3);
  cursor: pointer;
  transition:
    transform var(--trans-med),
    box-shadow var(--trans-med),
    border-color var(--trans-med),
    background var(--trans-med);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-height: 76px;
}

.book-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  background: var(--accent);
  opacity: 0;
  transition: opacity var(--trans-med);
}

.book-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
  background: #FFFCF7;
}

.book-card:hover::before {
  opacity: 1;
}

.book-card:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.book-card.playing {
  border-color: var(--accent);
  background: var(--accent-light);
  box-shadow: 0 0 0 2px var(--accent-glow), var(--shadow-sm);
}

.book-card.playing::before {
  opacity: 1;
}

.book-num {
  font-size: 0.65rem;
  color: var(--text-3);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.book-name-zh {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-1);
  line-height: 1.3;
}

.book-ch-count {
  font-size: 0.68rem;
  color: var(--text-3);
  margin-top: 2px;
}

/* 播放中的滾動動畫指示器 */
.book-card.playing .book-name-zh {
  color: var(--accent-hover);
}

/* ── 章節視圖 ── */
.book-header {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--surface-2);
}

.book-header-name {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.01em;
}

.book-header-count {
  font-size: 0.82rem;
  color: var(--text-3);
  white-space: nowrap;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: var(--space-2);
}

/* 章節按鈕 */
.chapter-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px var(--space-2);
  text-align: center;
  cursor: pointer;
  transition:
    background var(--trans-fast),
    border-color var(--trans-fast),
    transform var(--trans-fast),
    box-shadow var(--trans-fast);
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  min-height: 56px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  role: listitem;
}

.chapter-btn:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  transform: scale(1.04);
  box-shadow: 0 2px 8px var(--accent-glow);
}

.chapter-btn:active {
  transform: scale(0.97);
}

.chapter-btn.playing {
  background: var(--accent);
  border-color: var(--accent-hover);
  box-shadow: 0 2px 12px var(--accent-glow);
  color: #fff;
}

.chapter-btn.playing .ch-label {
  color: rgba(255,255,255,0.7);
}

.chapter-btn.playing .ch-num {
  color: #fff;
}

.ch-label {
  font-size: 0.6rem;
  color: var(--text-3);
  letter-spacing: 0.04em;
}

.ch-num {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-1);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

/* 播放中的章節按鈕滾動指示 */
@keyframes spin-ring {
  to { transform: rotate(360deg); }
}

.chapter-btn.playing::after {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  animation: pulse-dot 1.2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 0.4; transform: scale(0.8); }
  50%       { opacity: 1;   transform: scale(1.2); }
}

/* ── 底部音頻播放器 ── */
.player {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--player-bg);
  border-top: 1px solid var(--player-border);
  box-shadow: 0 -4px 32px rgba(0,0,0,0.5);
  transform: translateY(100%);
  transition: transform var(--trans-slow);
  /* 安全區域（iPhone 底部） */
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.player.visible {
  transform: translateY(0);
}

.player-body {
  max-width: 900px;
  margin: 0 auto;
  padding: 12px var(--space-4) 8px;
  display: grid;
  grid-template-areas:
    "info  controls"
    "prog  prog";
  grid-template-columns: 1fr auto;
  gap: 8px var(--space-4);
  align-items: center;
}

/* 播放信息 */
.player-info {
  grid-area: info;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  overflow: hidden;
}

.player-track-icon {
  color: var(--player-text-2);
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.player-track-icon svg {
  width: 22px;
  height: 22px;
}

.player-track {
  overflow: hidden;
}

.player-book-name {
  font-size: 0.78rem;
  color: var(--player-text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player-chapter-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--player-text-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 控制按鈕組 */
.player-controls {
  grid-area: controls;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.ctrl-btn {
  background: none;
  border: none;
  color: var(--player-text-1);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  transition: background var(--trans-fast), color var(--trans-fast), transform var(--trans-fast);
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}

.ctrl-btn:hover {
  background: rgba(255,255,255,0.1);
}

.ctrl-btn:active {
  transform: scale(0.9);
}

.ctrl-btn svg { display: block; }

/* 播放/暫停大按鈕 */
.play-btn {
  width: 48px;
  height: 48px;
  background: var(--player-accent) !important;
  color: #1A130D !important;
  box-shadow: 0 2px 12px rgba(212, 168, 67, 0.35);
  flex-shrink: 0;
}

.play-btn:hover {
  background: #E8BC56 !important;
  box-shadow: 0 4px 16px rgba(212, 168, 67, 0.5);
}

/* 進度條區域 */
.player-progress-area {
  grid-area: prog;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.player-progress-bar {
  position: relative;
  height: 20px;
  display: flex;
  align-items: center;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}

.progress-track {
  position: relative;
  width: 100%;
  height: 4px;
  background: var(--player-track);
  border-radius: 2px;
  overflow: visible;
}

.progress-fill {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  background: var(--player-fill);
  border-radius: 2px;
  width: 0%;
  transition: width 0.2s linear;
  pointer-events: none;
}

.progress-thumb {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  background: var(--player-thumb);
  border-radius: 50%;
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
  left: 0%;
  transition: left 0.2s linear, width 0.1s, height 0.1s;
  pointer-events: none;
}

/* 進度條拖動時展開 thumb */
.player-progress-bar.dragging .progress-thumb,
.player-progress-bar:active .progress-thumb {
  width: 18px;
  height: 18px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.5);
  transition: none;
}

.player-progress-bar.dragging .progress-fill {
  transition: none;
}

.player-times {
  display: flex;
  justify-content: space-between;
  font-size: 0.68rem;
  color: var(--player-text-2);
  font-variant-numeric: tabular-nums;
  padding: 0 2px;
}

/* 波形動畫（播放中圖標替代） */
.wave-bars {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 14px;
}
.wave-bars span {
  width: 3px;
  background: var(--player-accent);
  border-radius: 1.5px;
  animation: wave-anim 0.8s ease-in-out infinite;
}
.wave-bars span:nth-child(1) { height: 6px;  animation-delay: 0s; }
.wave-bars span:nth-child(2) { height: 10px; animation-delay: 0.1s; }
.wave-bars span:nth-child(3) { height: 14px; animation-delay: 0.2s; }
.wave-bars span:nth-child(4) { height: 8px;  animation-delay: 0.3s; }
@keyframes wave-anim {
  0%, 100% { transform: scaleY(0.5); opacity: 0.7; }
  50%       { transform: scaleY(1);   opacity: 1; }
}

/* ── 空狀態提示 ── */
.empty-hint {
  text-align: center;
  padding: var(--space-7) var(--space-4);
  color: var(--text-3);
  font-size: 0.9rem;
}

/* ── 響應式 ── */

/* 手機：小屏 */
@media (max-width: 480px) {
  :root {
    --header-height: 54px;
    --player-height: 120px;
  }

  .brand-title { font-size: 0.9rem; }
  .brand-sub   { display: none; }
  .brand-icon svg { width: 30px; height: 30px; }

  .page-title  { font-size: 1.4rem; }
  .book-grid   { grid-template-columns: repeat(2, 1fr); }

  .chapter-grid {
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: 8px;
  }

  .player-body {
    padding: 10px var(--space-3) 6px;
    gap: 6px var(--space-3);
  }

  .ctrl-btn  { width: 36px; height: 36px; }
  .play-btn  { width: 44px; height: 44px; }

  .book-header-name { font-size: 1.3rem; }
}

/* 平板 */
@media (min-width: 600px) {
  .book-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
}

/* 桌面 */
@media (min-width: 900px) {
  body { padding-top: var(--header-height); }
  .main-content { padding: var(--space-6) var(--space-5); }
  .book-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .chapter-grid { grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); }
}

/* ── 無障礙焦點樣式 ── */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ── 滾動條美化（桌面） ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

/* ── 選取顏色 ── */
::selection { background: var(--accent-light); color: var(--accent-hover); }

/* ── 不可用書卷（尚未錄製） ── */
.book-card.unavailable {
  opacity: 0.52;
  cursor: not-allowed;
  background: var(--surface-2);
  border-style: dashed;
}

.book-card.unavailable:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--border);
  background: var(--surface-2);
}

.book-card.unavailable::before {
  display: none;
}

.book-unavail-tag {
  font-size: 0.6rem;
  color: var(--text-3);
  background: rgba(0,0,0,0.06);
  border-radius: 3px;
  padding: 1px 5px;
  margin-top: 2px;
  display: inline-block;
  letter-spacing: 0.04em;
}