/* ==========================================================================
   星語有聲小說平台 - 沉浸式閱讀、6 大視覺風格主題與自適應排版樣式庫
   ========================================================================== */

:root {
  --primary-color: #f97316;
  --primary-hover: #ea580c;
  --primary-rgb: 249, 115, 22;
  --accent-color: #fbbf24;
  --highlight-bg: rgba(249, 115, 22, 0.22);
  --highlight-border: #f97316;

  /* 預設主題：無限劍製 (UBW Twilight) */
  --bg-body: #160a05;
  --bg-gradient: radial-gradient(circle at 50% 0%, rgba(234, 88, 12, 0.16) 0%, transparent 65%), linear-gradient(180deg, #1c0d07 0%, #261209 50%, #140804 100%);
  --bg-surface: #241108;
  --bg-sidebar: #1d0e07;
  --bg-player: rgba(36, 17, 8, 0.96);
  --border-color: #442213;
  --text-main: #fbeee0;
  --text-secondary: #c9ab96;
  --text-muted: #8c6f5d;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.35);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
  --shadow-player: 0 -4px 25px rgba(0, 0, 0, 0.85);

  /* 排版預設變數 */
  --reader-font-family: -apple-system, BlinkMacSystemFont, "Noto Serif TC", "Source Han Serif TC", "Songti TC", Georgia, serif;
  --reader-font-size: 19px;
  --reader-line-height: 1.85;
  --reader-letter-spacing: 0.5px;
  --reader-paragraph-spacing: 1.2em;
  --reader-max-width: 820px;
}

/* ⚔️ 主題 1：固有結界·無限劍製 (UBW Twilight) - 燃鋼暮雲專屬風格 */
[data-theme="ubw"] {
  --primary-color: #f97316;
  --primary-hover: #ea580c;
  --primary-rgb: 249, 115, 22;
  --accent-color: #fbbf24;
  --bg-body: #160a05;
  --bg-gradient: radial-gradient(circle at 50% 0%, rgba(234, 88, 12, 0.16) 0%, transparent 65%), linear-gradient(180deg, #1c0d07 0%, #261209 50%, #140804 100%);
  --bg-surface: #241108;
  --bg-sidebar: #1d0e07;
  --bg-player: rgba(36, 17, 8, 0.96);
  --border-color: #442213;
  --text-main: #fbeee0;
  --text-secondary: #c9ab96;
  --text-muted: #8c6f5d;
  --highlight-bg: rgba(245, 158, 11, 0.26);
  --highlight-border: #f59e0b;
  --shadow-player: 0 -4px 25px rgba(0, 0, 0, 0.85);
  --theme-vignette: radial-gradient(circle at 50% 30%, transparent 50%, rgba(10, 4, 2, 0.45) 100%);
}

/* 📜 主題 2：時鐘塔·古典羊皮紙 (Clock Tower Parchment) - 質感溫潤護眼 */
[data-theme="sepia"] {
  --primary-color: #b45309;
  --primary-hover: #92400e;
  --primary-rgb: 180, 83, 9;
  --accent-color: #d97706;
  --bg-body: #fbf5e8;
  --bg-gradient: radial-gradient(ellipse at 50% 50%, #fbf6ec 0%, #f3e8d2 100%);
  --bg-surface: #f4ecda;
  --bg-sidebar: #eee4cc;
  --bg-player: rgba(244, 236, 218, 0.96);
  --border-color: #e2d3b5;
  --text-main: #36281a;
  --text-secondary: #6e5843;
  --text-muted: #96816c;
  --highlight-bg: rgba(217, 119, 6, 0.16);
  --highlight-border: #d97706;
  --shadow-player: 0 -4px 20px rgba(78, 59, 39, 0.09);
  --theme-vignette: radial-gradient(ellipse at center, transparent 65%, rgba(138, 107, 72, 0.08) 100%);
}

/* 🌌 主題 3：迦勒底·極夜深空 (Chaldea Midnight) - 令咒冰晶藍 */
[data-theme="chaldea"], [data-theme="dark"] {
  --primary-color: #38bdf8;
  --primary-hover: #0284c7;
  --primary-rgb: 56, 189, 248;
  --accent-color: #818cf8;
  --bg-body: #0a0e17;
  --bg-gradient: radial-gradient(circle at 75% 15%, rgba(56, 189, 248, 0.12) 0%, transparent 55%), linear-gradient(180deg, #0b101c 0%, #0f172a 60%, #080c14 100%);
  --bg-surface: #131d31;
  --bg-sidebar: #0f172a;
  --bg-player: rgba(19, 29, 49, 0.96);
  --border-color: #243553;
  --text-main: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --highlight-bg: rgba(56, 189, 248, 0.24);
  --highlight-border: #38bdf8;
  --shadow-player: 0 -4px 25px rgba(0, 0, 0, 0.7);
  --theme-vignette: radial-gradient(circle at center, transparent 70%, rgba(4, 7, 13, 0.6) 100%);
}

/* 🍃 主題 4：阿瓦隆·仙境竹青 (Avalon Forest) - 柔和舒適豆沙綠 */
[data-theme="green"] {
  --primary-color: #16a34a;
  --primary-hover: #15803d;
  --primary-rgb: 22, 163, 74;
  --accent-color: #84cc16;
  --bg-body: #edf3ed;
  --bg-gradient: linear-gradient(180deg, #edf4ed 0%, #e2ece2 100%);
  --bg-surface: #dbe8db;
  --bg-sidebar: #d2e2d2;
  --bg-player: rgba(219, 232, 219, 0.96);
  --border-color: #c0d6c0;
  --text-main: #18331f;
  --text-secondary: #3b6044;
  --text-muted: #64866b;
  --highlight-bg: rgba(34, 197, 94, 0.18);
  --highlight-border: #16a34a;
  --shadow-player: 0 -4px 20px rgba(33, 66, 38, 0.08);
}

/* ❄️ 主題 5：冬木雪原·沉靜白晝 (Fuyuki Snow) - 素雅明朗 */
[data-theme="light"] {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-rgb: 37, 99, 235;
  --accent-color: #f59e0b;
  --bg-body: #f8fafc;
  --bg-gradient: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
  --bg-surface: #ffffff;
  --bg-sidebar: #f8fafc;
  --bg-player: rgba(255, 255, 255, 0.96);
  --border-color: #e2e8f0;
  --text-main: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --highlight-bg: rgba(37, 99, 235, 0.14);
  --highlight-border: #2563eb;
  --shadow-player: 0 -4px 20px rgba(0, 0, 0, 0.06);
}

/* 🌑 主題 6：黑化殘響·曜石純黑 (Dark Shadow) - 極黑極致省電 */
[data-theme="oled"] {
  --primary-color: #ef4444;
  --primary-hover: #dc2626;
  --primary-rgb: 239, 68, 68;
  --accent-color: #f59e0b;
  --bg-body: #000000;
  --bg-gradient: #000000;
  --bg-surface: #0a0a0a;
  --bg-sidebar: #060606;
  --bg-player: rgba(10, 10, 10, 0.97);
  --border-color: #262626;
  --text-main: #eaeaea;
  --text-secondary: #a3a3a3;
  --text-muted: #737373;
  --highlight-bg: rgba(239, 68, 68, 0.25);
  --highlight-border: #ef4444;
  --shadow-player: 0 -4px 25px rgba(0, 0, 0, 0.95);
}

/* 基礎重置與排版 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-body);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang TC", "Microsoft JhengHei", sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  padding-bottom: 125px; /* 為底部播放器留出充足空間 */
}

/* 頂部導航列 */
.top-navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-left, .nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 260px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-badge {
  font-size: 11px;
  background: var(--primary-color);
  color: #fff;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}

.icon-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  width: 38px;
  height: 38px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 18px;
}

.icon-btn:hover {
  background: var(--border-color);
  color: var(--text-main);
}

.icon-btn.active {
  color: var(--primary-color);
  background: var(--highlight-bg);
}

/* 閱讀主區域 */
.reader-container {
  width: 100%;
  max-width: var(--reader-max-width);
  margin: 0 auto;
  padding: 32px 20px 48px;
  flex: 1;
}

.chapter-header {
  margin-bottom: 36px;
  text-align: center;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 24px;
}

.chapter-volume-tag {
  display: inline-block;
  font-size: 13px;
  color: var(--primary-color);
  background: var(--highlight-bg);
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
  font-weight: 600;
}

.chapter-title {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-main);
  margin-bottom: 12px;
  font-family: var(--reader-font-family);
}

.chapter-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

/* 鎖屏背景播放提示 Banner */
.bg-playback-banner {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(147, 51, 234, 0.1));
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: 12px;
  padding: 12px 16px;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-main);
}

.banner-content {
  display: flex;
  align-items: center;
  gap: 10px;
}

.banner-icon {
  font-size: 20px;
}

.banner-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 14px;
}

/* 小說內文排版 */
.chapter-content {
  font-family: var(--reader-font-family);
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  letter-spacing: var(--reader-letter-spacing);
  color: var(--text-main);
  word-break: break-word;
  text-align: justify;
}

.chapter-content p {
  margin-bottom: var(--reader-paragraph-spacing);
  text-indent: 2em;
  padding: 6px 12px;
  border-radius: 6px;
  border-left: 3px solid transparent;
  transition: all 0.25s ease;
  position: relative;
  cursor: pointer;
}

.chapter-content p:hover {
  background-color: rgba(var(--primary-rgb), 0.05);
}

/* 語音播放時的歌詞式高亮段落 */
.chapter-content p.speaking-active {
  background-color: var(--highlight-bg);
  border-left-color: var(--highlight-border);
  transform: translateX(4px);
  color: var(--text-main);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.chapter-content p.speaking-active::before {
  content: "🔊";
  position: absolute;
  left: -20px;
  top: 8px;
  font-size: 14px;
  opacity: 0.85;
}

/* 章節底部導航按鈕 */
.chapter-nav-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-ch-btn {
  flex: 1;
  max-width: 220px;
  padding: 12px 18px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-main);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s;
  box-shadow: var(--shadow-sm);
}

.nav-ch-btn:hover:not(:disabled) {
  background-color: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
  transform: translateY(-1px);
}

.nav-ch-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* 側邊目錄抽屜 (Drawer) */
.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  backdrop-filter: blur(4px);
}

.drawer-overlay.open {
  opacity: 1;
  visibility: visible;
}

.toc-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 360px;
  max-width: 85vw;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  z-index: 100;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
}

.toc-drawer.open {
  transform: translateX(0);
}

.drawer-header {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
}

.toc-search-box {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

.toc-search-input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-main);
  border-radius: 6px;
  font-size: 13px;
  outline: none;
}

.toc-search-input:focus {
  border-color: var(--primary-color);
}

.toc-vol-tabs {
  display: flex;
  padding: 6px 12px;
  gap: 8px;
  background: var(--bg-body);
  border-bottom: 1px solid var(--border-color);
}

.toc-tab-btn {
  flex: 1;
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 600;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.toc-tab-btn.active {
  background: var(--bg-surface);
  color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.toc-list-container {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.toc-item {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2px;
  transition: all 0.15s;
}

.toc-item:hover {
  background-color: var(--border-color);
}

.toc-item.current {
  background-color: var(--highlight-bg);
  color: var(--primary-color);
  font-weight: 700;
}

.toc-item-badge {
  font-size: 11px;
  color: var(--text-muted);
}

/* 排版與閱讀設定 Modal */
.settings-modal {
  position: fixed;
  bottom: 110px;
  right: 20px;
  width: 320px;
  max-width: calc(100vw - 40px);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  padding: 18px;
  z-index: 80;
  display: none;
  animation: slideUpFade 0.2s ease-out;
}

.settings-modal.show {
  display: block;
}

@keyframes slideUpFade {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.settings-group {
  margin-bottom: 16px;
}

.settings-group:last-child {
  margin-bottom: 0;
}

.settings-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.theme-options {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.theme-btn {
  height: 36px;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}

.theme-btn.active {
  border-color: var(--primary-color);
}

.theme-btn[data-theme="light"] { background: #ffffff; color: #1e293b; border: 1px solid #cbd5e1; }
.theme-btn[data-theme="sepia"] { background: #fbf5e8; color: #3d3023; }
.theme-btn[data-theme="green"] { background: #eaf1ea; color: #203823; }
.theme-btn[data-theme="dark"]  { background: #0f172a; color: #f1f5f9; }

.font-size-control, .line-height-control {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn-pill {
  flex: 1;
  padding: 6px 12px;
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-main);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: all 0.15s;
}

.btn-pill:hover {
  background: var(--border-color);
}

.btn-pill.active {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
}

/* ==========================================================================
   底部懸浮有聲播放控制座 (Floating Audio Player Dock)
   ========================================================================== */
.audio-dock {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 70;
  background-color: var(--bg-player);
  border-top: 1px solid var(--border-color);
  box-shadow: var(--shadow-player);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 10px 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 播放進度條 */
.player-progress-bar-wrap {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 10px;
}

.time-text {
  font-size: 11px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  min-width: 36px;
}

.time-text.right {
  text-align: right;
}

.progress-track {
  flex: 1;
  height: 6px;
  background-color: var(--border-color);
  border-radius: 3px;
  position: relative;
  cursor: pointer;
  overflow: hidden;
}

.progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary-color), #60a5fa);
  border-radius: 3px;
  transition: width 0.1s linear;
}

/* 控制列主排版 */
.player-main-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

/* 左側：資訊區 */
.player-info {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

.player-cover-thumbnail {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: linear-gradient(135deg, #1e293b, #334155);
  color: #fff;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.player-titles {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.player-ch-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player-status-tag {
  font-size: 11px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: #22c55e;
  animation: pulseAnim 1.8s infinite;
}

@keyframes pulseAnim {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(34, 197, 94, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

/* 中間：核心按鈕 (前進/後退/播放/下一章) */
.player-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ctrl-btn {
  background: transparent;
  border: none;
  color: var(--text-main);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s;
  font-size: 16px;
}

.ctrl-btn:hover:not(:disabled) {
  background: var(--border-color);
  transform: scale(1.05);
}

.ctrl-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.ctrl-btn.play-pause-btn {
  width: 46px;
  height: 46px;
  background-color: var(--primary-color);
  color: #fff;
  font-size: 20px;
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.35);
}

.ctrl-btn.play-pause-btn:hover {
  background-color: var(--primary-hover);
  transform: scale(1.08);
}

/* 右側：輔助控制 (自動換頁開關、語速、睡眠定時、語音設定) */
.player-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 600;
  padding: 5px 9px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.badge-toggle-btn.active {
  background: #ecfdf5;
  color: #059669;
  border-color: #a7f3d0;
}

[data-theme="dark"] .badge-toggle-btn.active,
[data-theme="oled"] .badge-toggle-btn.active {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border-color: #059669;
}

/* 語音與定時彈出小清單 */
.popover-menu {
  position: absolute;
  bottom: 85px;
  right: 16px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 12px;
  width: 260px;
  z-index: 85;
  display: none;
}

.popover-menu.show {
  display: block;
}

.menu-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-main);
  cursor: pointer;
}

.menu-item:hover {
  background: var(--border-color);
}

.menu-item.selected {
  color: var(--primary-color);
  font-weight: 600;
}

/* ==========================================================================
   閱讀歷程記憶通知卡片 (Resume History Banner)
   ========================================================================== */
.resume-toast {
  position: fixed;
  top: 70px;
  left: 50%;
  transform: translateX(-50%) translateY(-20px);
  max-width: 90vw;
  width: 520px;
  background: var(--bg-surface);
  border: 1px solid var(--primary-color);
  box-shadow: 0 10px 25px -5px rgba(var(--primary-rgb), 0.25), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  border-radius: 12px;
  padding: 12px 16px;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.resume-toast.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.resume-toast-info {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.resume-toast-icon {
  font-size: 22px;
  flex-shrink: 0;
}

.resume-toast-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.resume-toast-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.resume-toast-sub {
  font-size: 11px;
  color: var(--text-secondary);
}

.resume-toast-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.btn-resume-now {
  background-color: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-resume-now:hover {
  background-color: var(--primary-hover);
}

.btn-resume-dismiss {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 6px;
  font-size: 14px;
}

/* ==========================================================================
   大綱篇章快速選擇樣式 (Outline Arc Cards)
   ========================================================================== */
.drawer-header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.drawer-title-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.drawer-count-badge {
  font-size: 11px;
  background: var(--highlight-bg);
  color: var(--primary-color);
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 700;
}

.pin-sidebar-btn {
  display: none; /* 由電腦端媒體查詢啟用 */
}

.pin-sidebar-btn.pinned {
  color: var(--primary-color);
  background: var(--highlight-bg);
}

.toc-mode-switch {
  display: flex;
  padding: 8px 12px;
  gap: 8px;
  background: var(--bg-body);
  border-bottom: 1px solid var(--border-color);
}

.toc-mode-btn {
  flex: 1;
  padding: 6px 10px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-secondary);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s;
}

.toc-mode-btn.active {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
}

.arc-group {
  margin-bottom: 10px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-surface);
}

.arc-header {
  padding: 10px 14px;
  background: var(--bg-body);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  font-size: 13px;
  color: var(--text-main);
  user-select: none;
  transition: background 0.15s;
}

.arc-header:hover {
  background: var(--border-color);
}

.arc-range-badge {
  font-size: 11px;
  background: var(--highlight-bg);
  color: var(--primary-color);
  padding: 2px 8px;
  border-radius: 12px;
  font-weight: 600;
}

.arc-body {
  display: none;
  padding: 6px;
  border-top: 1px solid var(--border-color);
}

.arc-group.open .arc-body {
  display: block;
}

.arc-chapter-item {
  padding: 8px 10px;
  border-radius: 6px;
  cursor: pointer;
  margin-bottom: 4px;
  transition: all 0.15s;
}

.arc-chapter-item:hover {
  background: var(--border-color);
}

.arc-chapter-item.current {
  background: var(--highlight-bg);
  border-left: 3px solid var(--primary-color);
}

.arc-chapter-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 2px;
}

.arc-chapter-summary {
  font-size: 11px;
  color: var(--text-secondary);
  line-height: 1.4;
  opacity: 0.85;
}

/* ==========================================================================
   頂部快速主題藥丸按鈕 (Quick Theme Pill)
   ========================================================================== */
.theme-quick-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  border-radius: 20px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-quick-pill:hover {
  border-color: var(--primary-color);
  background: var(--highlight-bg);
}

.theme-pill-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary-color);
  box-shadow: 0 0 8px rgba(var(--primary-rgb), 0.6);
}

/* ==========================================================================
   6 款沉浸式風格主題選單 (Theme Grid & Cards)
   ========================================================================== */
.settings-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.modal-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 16px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}

.settings-hint {
  font-size: 11px;
  font-weight: normal;
  color: var(--text-muted);
}

.theme-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-top: 8px;
}

.theme-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1.5px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
  transition: all 0.2s ease;
}

.theme-card:hover {
  border-color: var(--primary-color);
  transform: translateY(-1px);
}

.theme-card.active {
  border-color: var(--primary-color);
  background: var(--highlight-bg);
  box-shadow: 0 0 0 1px var(--primary-color);
}

.theme-swatch {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  flex-shrink: 0;
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.swatch-ubw {
  background: linear-gradient(135deg, #f97316 0%, #241108 100%);
}

.swatch-sepia {
  background: linear-gradient(135deg, #fbf5e8 0%, #b45309 100%);
}

.swatch-chaldea {
  background: linear-gradient(135deg, #38bdf8 0%, #0a0e17 100%);
}

.swatch-green {
  background: linear-gradient(135deg, #86efac 0%, #166534 100%);
}

.swatch-light {
  background: linear-gradient(135deg, #ffffff 0%, #94a3b8 100%);
}

.swatch-oled {
  background: linear-gradient(135deg, #ef4444 0%, #000000 100%);
}

.theme-card-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.theme-name {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.2;
}

.theme-desc {
  font-size: 10px;
  color: var(--text-secondary);
  line-height: 1.2;
  margin-top: 2px;
}

.font-size-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
}

.font-size-label {
  font-size: 13px;
  color: var(--text-secondary);
}

.font-size-val {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-color);
  padding: 0 8px;
}

.layout-toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* ==========================================================================
   📚 小說書城與獨立卷冊書架 (Bookshelf & Standalone Book Cards)
   ========================================================================== */
.nav-bookshelf-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--highlight-bg);
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
}

.nav-bookshelf-btn:hover {
  background: var(--primary-color);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.25);
}

.drawer-bookshelf-link {
  background: var(--highlight-bg);
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.drawer-bookshelf-link:hover {
  background: var(--primary-color);
  color: #fff;
}

/* TOC 卷冊篩選橫向膠囊列 */
.toc-vol-filter-bar {
  display: flex;
  gap: 6px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  scrollbar-width: none;
}
.toc-vol-filter-bar::-webkit-scrollbar {
  display: none;
}

.toc-vol-pill {
  padding: 4px 10px;
  border-radius: 14px;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.toc-vol-pill:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.toc-vol-pill.active {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
}

/* 書架主容器 */
.bookshelf-container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 28px 20px 60px;
  animation: fadeInView 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeInView {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 書城頂部 Hero */
.bookshelf-hero {
  text-align: center;
  padding: 28px 20px 24px;
  background: radial-gradient(circle at 50% 0%, rgba(var(--primary-rgb), 0.12) 0%, transparent 70%), var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.bookshelf-hero-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--primary-color);
  background: var(--highlight-bg);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
  border: 1px solid rgba(var(--primary-rgb), 0.2);
}

.bookshelf-hero-title {
  font-family: var(--reader-font-family);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.bookshelf-hero-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto 16px;
  line-height: 1.6;
}

.bookshelf-hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
}

.stat-pill {
  font-weight: 500;
}

.stat-pill .stat-num {
  color: var(--primary-color);
  font-weight: 700;
  font-size: 14px;
}

.stat-divider {
  opacity: 0.4;
}

/* 接續閱讀推薦卡片 (Resume Banner) */
.bookshelf-resume-banner {
  background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.12) 0%, rgba(var(--primary-rgb), 0.03) 100%), var(--bg-surface);
  border: 1px solid var(--primary-color);
  border-radius: 14px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 30px;
  box-shadow: 0 4px 18px rgba(var(--primary-rgb), 0.12);
}

.resume-banner-left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.resume-book-icon {
  width: 46px;
  height: 46px;
  border-radius: 10px;
  background: var(--highlight-bg);
  border: 1px solid var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.resume-banner-info {
  min-width: 0;
}

.resume-banner-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--primary-color);
  letter-spacing: 0.5px;
  margin-bottom: 2px;
}

.resume-banner-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 500px;
}

.resume-banner-meta {
  font-size: 12px;
  color: var(--text-muted);
}

.resume-banner-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.btn-bookshelf-primary, .btn-bookshelf-accent, .btn-bookshelf-outline {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  white-space: nowrap;
}

.btn-bookshelf-primary {
  background: var(--primary-color);
  color: #fff;
  border: 1px solid var(--primary-color);
}

.btn-bookshelf-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.3);
}

.btn-bookshelf-accent {
  background: var(--highlight-bg);
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
}

.btn-bookshelf-accent:hover {
  background: var(--primary-color);
  color: #fff;
  transform: translateY(-1px);
}

.btn-bookshelf-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.btn-bookshelf-outline:hover {
  background: var(--border-color);
  color: var(--text-main);
}

/* 書架分類欄與篩選標籤 */
.bookshelf-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.bookshelf-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  font-family: var(--reader-font-family);
}

.bookshelf-count-tag {
  font-size: 12px;
  color: var(--text-muted);
  font-family: -apple-system, sans-serif;
  font-weight: 500;
}

.vol-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.vol-tab {
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.vol-tab:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.vol-tab.active {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
  box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.25);
}

/* 獨立成書書架網格 */
.bookshelf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 24px;
  margin-bottom: 48px;
}

/* 單本獨立成書卡片 (Book Card) */
.book-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.book-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-color);
  box-shadow: 0 12px 28px -6px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(var(--primary-rgb), 0.25);
}

.book-card.upcoming {
  opacity: 0.85;
  border-style: dashed;
}

/* 書卡頂部：左邊 3D 封面，右邊關鍵標題資訊 */
.book-card-top {
  display: flex;
  gap: 18px;
  margin-bottom: 16px;
}

/* 3D 擬真精裝立體書封面 (3D Book Cover) */
.book-cover-3d {
  width: 110px;
  height: 155px;
  border-radius: 3px 8px 8px 3px;
  flex-shrink: 0;
  position: relative;
  box-shadow:
    -3px 0 6px rgba(0, 0, 0, 0.35),
    4px 8px 18px rgba(0, 0, 0, 0.45);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 10px 8px;
  color: #fff;
  overflow: hidden;
  transition: transform 0.25s ease;
}

.book-card:hover .book-cover-3d {
  transform: rotateY(-6deg) scale(1.02);
}

/* 書脊高光立體層 */
.book-cover-3d::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 14px;
  background: linear-gradient(to right, rgba(0,0,0,0.5) 0%, rgba(255,255,255,0.2) 20%, rgba(0,0,0,0.1) 60%, transparent 100%);
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  pointer-events: none;
}

/* 燙金裝飾邊框線 */
.book-cover-3d::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 2px 5px 5px 2px;
  pointer-events: none;
}

.book-cover-vol {
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 1px;
  opacity: 0.85;
  text-transform: uppercase;
  padding-left: 6px;
}

.book-cover-center {
  text-align: center;
}

.book-cover-icon {
  font-size: 26px;
  display: block;
  margin-bottom: 4px;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.5));
}

.book-cover-title {
  font-family: var(--reader-font-family);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.25;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
  letter-spacing: 0.5px;
}

.book-cover-bottom {
  text-align: right;
  font-size: 9px;
  opacity: 0.8;
  font-weight: 600;
}

/* 書卡右側簡介 */
.book-card-main-meta {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.book-status-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}

.book-vol-num-tag {
  font-size: 10px;
  font-weight: 800;
  background: var(--highlight-bg);
  color: var(--primary-color);
  padding: 2px 7px;
  border-radius: 4px;
}

.book-status-tag {
  font-size: 10px;
  font-weight: 600;
  background: var(--border-color);
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 4px;
}

.book-status-tag.published {
  background: #ecfdf5;
  color: #059669;
}
[data-theme="dark"] .book-status-tag.published,
[data-theme="ubw"] .book-status-tag.published,
[data-theme="chaldea"] .book-status-tag.published,
[data-theme="oled"] .book-status-tag.published {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
}

.book-title {
  font-family: var(--reader-font-family);
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
  margin-bottom: 4px;
}

.book-subtitle {
  font-size: 13px;
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 8px;
}

.book-stats-badges {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 11px;
  color: var(--text-muted);
  margin-top: auto;
}

.book-stats-badge {
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  padding: 2px 6px;
  border-radius: 4px;
}

/* 經典名言 / 金句區塊 */
.book-quote-box {
  background: var(--bg-body);
  border-left: 3px solid var(--primary-color);
  padding: 8px 12px;
  border-radius: 0 6px 6px 0;
  font-size: 12px;
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 12px;
  font-family: var(--reader-font-family);
}

/* 舞台與角色 */
.book-info-row {
  display: flex;
  align-items: flex-start;
  gap: 6px;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 4px;
  line-height: 1.4;
}

.book-info-row strong {
  color: var(--text-secondary);
  white-space: nowrap;
}

/* 故事梗概 */
.book-synopsis {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin: 8px 0 14px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 卷閱讀進度條 */
.book-card-progress {
  margin-bottom: 14px;
}

.book-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.book-progress-track {
  height: 4px;
  background: var(--border-color);
  border-radius: 2px;
  overflow: hidden;
}

.book-progress-bar {
  height: 100%;
  background: var(--primary-color);
  border-radius: 2px;
  transition: width 0.3s ease;
}

/* 卡片底部操作按鈕 */
.book-card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 8px;
  margin-top: auto;
}

/* 書城底部特點 */
.bookshelf-footer {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px dashed var(--border-color);
}

.footer-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.footer-feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 12px 16px;
}

.footer-feature-item .f-icon {
  font-size: 26px;
  flex-shrink: 0;
}

.footer-feature-item .f-text strong {
  display: block;
  font-size: 13px;
  color: var(--text-main);
  margin-bottom: 2px;
}

.footer-feature-item .f-text span {
  font-size: 11px;
  color: var(--text-muted);
}

/* ==========================================================================
   全域自適應排版架構 (Adaptive Layout & Screen Media Queries)
   ========================================================================== */
.app-layout {
  display: flex;
  width: 100%;
  position: relative;
}

.main-content-wrapper {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* 🖥️ 電腦與寬螢幕自適應 (Desktop: min-width: 1024px) */
@media (min-width: 1024px) {
  .pin-sidebar-btn {
    display: inline-flex !important;
  }

  /* 電腦側邊欄釘選常駐分欄模式 */
  .app-layout.sidebar-pinned .toc-drawer {
    position: sticky;
    top: 0;
    height: 100vh;
    width: 320px;
    min-width: 320px;
    max-width: 320px;
    transform: none !important;
    box-shadow: none;
    border-right: 1px solid var(--border-color);
    z-index: 40;
    transition: width 0.25s ease;
  }

  .app-layout.sidebar-pinned .drawer-overlay {
    display: none !important;
  }

  /* 電腦專屬右側快捷懸浮工具列 */
  .desktop-quick-bar {
    display: flex;
    flex-direction: column;
    position: fixed;
    right: 28px;
    bottom: 120px;
    gap: 10px;
    z-index: 45;
  }

  .quick-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    box-shadow: var(--shadow-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 15px;
    font-weight: 700;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  }

  .quick-btn:hover {
    transform: translateY(-2px) scale(1.06);
    border-color: var(--primary-color);
    color: var(--primary-color);
    box-shadow: 0 6px 16px rgba(var(--primary-rgb), 0.3);
  }

  /* 寬螢幕主閱讀區居中舒適排版 */
  .reader-container {
    max-width: 840px;
    margin: 0 auto;
    padding: 36px 44px 60px;
  }

  /* 寬螢幕底欄播控器 */
  .audio-dock {
    height: 88px;
    padding: 8px 36px;
  }

  .player-main-row {
    display: grid;
    grid-template-columns: 280px 1fr 340px;
    align-items: center;
    gap: 24px;
  }

  .player-info {
    max-width: 280px;
  }

  .player-controls {
    justify-content: center;
    gap: 16px;
  }

  .player-actions {
    justify-content: flex-end;
  }
}

/* 💻 平板中等螢幕自適應 (769px ~ 1023px) */
@media (min-width: 769px) and (max-width: 1023px) {
  .pin-sidebar-btn {
    display: none !important;
  }
  .desktop-only-setting {
    display: none !important;
  }
  .desktop-quick-bar {
    display: none !important;
  }
  .reader-container {
    max-width: 740px;
    margin: 0 auto;
    padding: 24px 24px 50px;
  }
}

/* 📱 手機螢幕行動端人體工學最佳化 (Mobile: max-width: 768px) */
@media (max-width: 768px) {
  :root {
    --reader-font-size: 18px;
    --reader-line-height: 1.82;
  }

  .pin-sidebar-btn {
    display: none !important;
  }
  .desktop-only-setting {
    display: none !important;
  }
  .desktop-quick-bar {
    display: none !important;
  }

  /* 緊湊頂欄 */
  .top-navbar {
    height: 52px;
    padding: 0 12px;
  }

  .brand-title {
    font-size: 14px;
    max-width: 160px;
  }

  .brand-badge {
    font-size: 9px;
    padding: 1px 5px;
  }

  .theme-quick-pill {
    padding: 4px 8px;
    font-size: 11px;
  }

  .theme-pill-name {
    display: none; /* 手機端只留圓點指示 */
  }

  /* 手機滿版舒適閱讀空間 */
  .reader-container {
    padding: 16px 14px calc(125px + env(safe-area-inset-bottom, 15px));
  }

  .chapter-header {
    margin-bottom: 22px;
  }

  .chapter-title {
    font-size: 21px;
    line-height: 1.4;
  }

  .chapter-content p {
    font-size: 18px;
    line-height: 1.82;
    margin-bottom: 1.15em;
  }

  /* 手機專屬底欄 (單手拇指操作與安全區適配) */
  .audio-dock {
    height: auto;
    padding: 6px 12px calc(8px + env(safe-area-inset-bottom, 12px));
    border-radius: 16px 16px 0 0;
  }

  .player-progress-bar-wrap {
    margin-bottom: 4px;
  }

  .player-main-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
  }

  .player-info {
    flex: 1;
    min-width: 0;
    max-width: 120px;
  }

  .player-cover-thumbnail {
    display: none;
  }

  .player-ch-title {
    font-size: 12px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .player-status-tag {
    font-size: 10px;
  }

  .player-controls {
    gap: 4px;
  }

  .skip-btn {
    display: none; /* 手機端精簡次要按鈕，保留核心上一章、播放、下一章 */
  }

  .ctrl-btn {
    width: 34px;
    height: 34px;
    font-size: 14px;
  }

  .ctrl-btn.play-pause-btn {
    width: 44px;
    height: 44px;
    font-size: 18px;
  }

  .player-actions {
    gap: 4px;
  }

  .badge-toggle-btn {
    padding: 4px 7px;
    font-size: 10px;
  }

  .badge-toggle-btn span.label-text {
    display: none; /* 手機端精簡文字以防止溢出 */
  }

  /* 手機抽屜寬度 */
  .toc-drawer {
    width: 86vw;
    max-width: 340px;
  }

  /* 手機設定卡片滿版適配 */
  .settings-modal {
    width: calc(100vw - 28px);
    right: 14px;
    top: 58px;
  }

  .theme-grid {
    grid-template-columns: 1fr;
  }

  /* 閱讀歷程提醒卡片 */
  .resume-toast {
    width: calc(100vw - 24px);
    left: 12px;
    transform: translateY(-20px);
    top: 60px;
    padding: 10px 12px;
  }

  .resume-toast.show {
    transform: translateY(0);
  }

  /* 📱 手機書城與書架自適應 */
  .nav-bookshelf-btn {
    padding: 4px 8px;
    font-size: 11px;
  }

  .nav-bookshelf-btn span.label {
    display: none;
  }

  .bookshelf-container {
    padding: 16px 12px calc(115px + env(safe-area-inset-bottom, 15px));
  }

  .bookshelf-hero {
    padding: 20px 14px 18px;
  }

  .bookshelf-hero-title {
    font-size: 21px;
  }

  .bookshelf-hero-subtitle {
    font-size: 13px;
    margin-bottom: 12px;
  }

  .bookshelf-hero-stats {
    gap: 8px;
    font-size: 11px;
  }

  .bookshelf-resume-banner {
    flex-direction: column;
    align-items: stretch;
    padding: 12px 14px;
    gap: 12px;
  }

  .resume-banner-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    width: 100%;
  }

  .resume-banner-actions button {
    width: 100%;
    padding: 8px 10px;
    font-size: 12px;
  }

  .bookshelf-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .book-card {
    padding: 16px 14px;
  }

  .book-card-top {
    gap: 14px;
  }

  .book-cover-3d {
    width: 95px;
    height: 135px;
  }

  .book-cover-icon {
    font-size: 22px;
  }

  .book-cover-title {
    font-size: 11px;
  }

  .book-card-actions {
    grid-template-columns: 1fr 1fr;
  }

  .book-card-actions .btn-bookshelf-outline {
    grid-column: span 2;
  }
}