/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #faf8f4;
  --bg-sidebar: #2c2420;
  --bg-sidebar-hover: #3d332d;
  --bg-note: #f3efe8;
  --text: #2c2420;
  --text-light: #6b5d52;
  --text-sidebar: #e8e0d6;
  --text-sidebar-dim: #a89888;
  --accent: #8b4513;
  --accent-light: #c4956a;
  --border: #d8cfc4;
  --verse-num: #a0522d;
  --font-body: "Noto Serif TC", "Source Han Serif TC", "Songti TC", serif;
  --font-ui: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}

html { font-size: 18px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  display: flex;
  min-height: 100vh;
}

/* === Sidebar === */
#sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--bg-sidebar);
  color: var(--text-sidebar);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  overflow-y: auto;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 2rem 1.5rem 1.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-header h1 {
  font-family: var(--font-body);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.sidebar-header .subtitle {
  font-family: var(--font-ui);
  font-size: 0.7rem;
  color: var(--text-sidebar-dim);
  margin-top: 0.4rem;
}

#book-list {
  flex: 1;
  padding: 1rem 0;
}

.book-name {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--text-sidebar);
  padding: 0.7rem 1.5rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.15s;
  user-select: none;
}

.book-name:hover { background: var(--bg-sidebar-hover); }
.book-name.open { color: var(--accent-light); }
.book-name::after { content: "›"; font-size: 1rem; transition: transform 0.2s; }
.book-name.open::after { transform: rotate(90deg); }

.chapter-list {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.chapter-list.open { max-height: 2000px; }

.chapter-link {
  display: block;
  padding: 0.4rem 1.5rem 0.4rem 2.2rem;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--text-sidebar);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s;
}

.chapter-link:hover {
  background: var(--bg-sidebar-hover);
}

.chapter-link.active {
  background: var(--bg-sidebar-hover);
  color: var(--accent-light);
  font-weight: 600;
}

.sidebar-footer {
  padding: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-family: var(--font-ui);
  font-size: 0.65rem;
  color: var(--text-sidebar-dim);
  line-height: 1.7;
}

/* === Main Content === */
main {
  flex: 1;
  margin-left: 280px;
  display: flex;
  justify-content: center;
  padding: 2rem;
}

#reader {
  max-width: 680px;
  width: 100%;
  padding: 2rem 0;
}

/* Welcome screen */
.welcome {
  text-align: center;
  padding: 6rem 2rem;
  color: var(--text-light);
}

.welcome h2 {
  font-size: 1.8rem;
  color: var(--text);
  margin-bottom: 1rem;
}

.welcome p {
  font-size: 0.95rem;
  line-height: 1.8;
  margin-bottom: 0.5rem;
}

.welcome .hint {
  margin-top: 2rem;
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--border);
}

/* === Typography === */
#reader h1 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
  color: var(--text);
}

#reader .chapter-meta {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--text-light);
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

#reader hr {
  display: none;
}

/* Verses */
#reader p {
  font-size: 1.05rem;
  line-height: 2;
  margin-bottom: 0.6rem;
  text-align: justify;
  text-indent: 0;
}

#reader p strong {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 0.75rem;
  color: var(--verse-num);
  vertical-align: super;
  margin-right: 0.2em;
  line-height: 1;
}

/* Annotations */
#reader blockquote {
  margin: 0.3rem 0 1.2rem 0;
  padding: 0.8rem 1.2rem;
  background: var(--bg-note);
  border-left: 3px solid var(--accent-light);
  border-radius: 0 4px 4px 0;
  font-size: 0.82rem;
  line-height: 1.9;
  color: var(--text-light);
}

#reader blockquote em {
  font-style: normal;
}

#reader blockquote p {
  font-size: 0.82rem;
  line-height: 1.9;
  margin-bottom: 0;
  text-align: left;
}

/* === Mobile === */
#menu-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 200;
  background: var(--bg-sidebar);
  color: var(--text-sidebar);
  border: none;
  border-radius: 6px;
  width: 40px;
  height: 40px;
  font-size: 1.2rem;
  cursor: pointer;
}

@media (max-width: 768px) {
  #sidebar {
    transform: translateX(-100%);
  }

  #sidebar.open {
    transform: translateX(0);
  }

  main {
    margin-left: 0;
    padding: 1rem;
    padding-top: 4rem;
  }

  #reader {
    padding: 0;
  }

  #menu-toggle {
    display: block;
  }

  .welcome .hint {
    display: none;
  }

  .welcome::after {
    content: "點擊左上角 ☰ 選擇章節";
    display: block;
    margin-top: 2rem;
    font-family: var(--font-ui);
    font-size: 0.8rem;
    color: var(--border);
  }
}

/* Overlay for mobile sidebar */
#sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 99;
}

#sidebar-overlay.visible {
  display: block;
}

/* === Scrollbar === */
#sidebar::-webkit-scrollbar { width: 4px; }
#sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 2px; }

/* === Audio Bar === */
#audio-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 280px;
  right: 0;
  background: var(--bg-sidebar);
  color: var(--text-sidebar);
  padding: 0.6rem 1.5rem;
  z-index: 90;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  font-family: var(--font-ui);
  box-shadow: 0 -2px 12px rgba(0,0,0,0.15);
}

#audio-bar.visible {
  display: flex;
}

.audio-controls {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.audio-controls button {
  background: none;
  border: 1px solid rgba(255,255,255,0.15);
  color: var(--text-sidebar);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.audio-controls button:hover {
  background: var(--bg-sidebar-hover);
  border-color: var(--accent-light);
}

#tts-play {
  width: 42px;
  height: 42px;
  font-size: 1.1rem;
  border-color: var(--accent-light);
}

.audio-label {
  font-size: 0.72rem;
  color: var(--text-sidebar-dim);
  margin-left: 0.5rem;
  letter-spacing: 0.05em;
}

.audio-speed {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-sidebar-dim);
}

.audio-speed input[type="range"] {
  width: 80px;
  accent-color: var(--accent-light);
  cursor: pointer;
}

#tts-speed-val {
  min-width: 2.5em;
  text-align: center;
  color: var(--text-sidebar);
}

/* Mode button */
#tts-mode {
  font-size: 0.85rem;
  color: var(--text-sidebar-dim);
  border-color: rgba(255,255,255,0.08);
}

#tts-mode.mode-loop {
  color: var(--accent-light);
  border-color: var(--accent-light);
}

#tts-mode.mode-cont {
  color: #7cb88a;
  border-color: #7cb88a;
}

.audio-mode-label {
  font-size: 0.68rem;
  color: var(--accent-light);
  min-width: 1em;
  letter-spacing: 0.04em;
}

/* Verse reading highlight */
#reader p.verse {
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
  border-left: 3px solid transparent;
  padding-left: 0.6rem;
  margin-left: -0.6rem;
}

#reader p.verse:hover {
  background: rgba(139, 69, 19, 0.04);
}

#reader p.verse.reading {
  background: rgba(196, 149, 106, 0.15);
  border-left-color: var(--accent);
}

/* Add bottom padding for audio bar */
#audio-bar.visible ~ script { display: none; }
main { padding-bottom: 5rem; }

@media (max-width: 768px) {
  #audio-bar { left: 0; padding: 0.5rem 1rem; gap: 1rem; }
  .audio-label { display: none; }
  .audio-mode-label { display: none; }
  .audio-speed input[type="range"] { width: 60px; }
}

/* Print */
@media print {
  #sidebar, #menu-toggle, #audio-bar { display: none !important; }
  main { margin-left: 0; padding-bottom: 0; }
  #reader blockquote { break-inside: avoid; }
  #reader p.verse { border-left: none; padding-left: 0; margin-left: 0; }
}