:root {
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --device-selector-bg: rgba(26, 33, 29, 0.96);
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --header-h: 72px;
  --reader-header-h: 64px;
  --reader-footer-h: 52px;
  --mobile-toolbar-h: 60px;
}

.theme-cream {
  --bg: #f7f4ed;
  --surface: #fffdf8;
  --surface-2: #f2efe7;
  --surface-3: #e8e4da;
  --text: #2c2922;
  --text-2: #5e5a4f;
  --text-3: #969183;
  --border: #e6e1d6;
  --primary: #c45c26;
  --primary-light: #fbe9d9;
  --primary-hover: #a84b1d;
  --danger: #d14d4d;
  --reader-bg: #fffdf8;
  --success: #4a8c5a;
  --cover-1: #c45c26;
  --cover-2: #8c5e3c;
}

.theme-paper {
  --bg: #f0f2f5;
  --surface: #ffffff;
  --surface-2: #f5f7fa;
  --surface-3: #e8ecf1;
  --text: #1a1d21;
  --text-2: #4b5563;
  --text-3: #9aa3b2;
  --border: #e3e8ee;
  --primary: #2563eb;
  --primary-light: #dbeafe;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --reader-bg: #ffffff;
  --success: #16a34a;
  --cover-1: #2563eb;
  --cover-2: #1e40af;
}

.theme-ink {
  --bg: #121418;
  --surface: #1a1d23;
  --surface-2: #22262e;
  --surface-3: #2d333d;
  --text: #e8e6e1;
  --text-2: #a6a39b;
  --text-3: #6b6861;
  --border: #2a2f37;
  --primary: #e8a64c;
  --primary-light: #3d2e1a;
  --primary-hover: #f0b866;
  --danger: #ef4444;
  --reader-bg: #14171c;
  --success: #22c55e;
  --cover-1: #e8a64c;
  --cover-2: #b8823d;
}

.theme-forest {
  --bg: #1a211d;
  --surface: #232b26;
  --surface-2: #2d3831;
  --surface-3: #37453c;
  --text: #e6ebe8;
  --text-2: #9caaa2;
  --text-3: #627269;
  --border: #2f3a34;
  --primary: #7fb069;
  --primary-light: #2a3a28;
  --primary-hover: #96c67e;
  --danger: #e86a6a;
  --reader-bg: #1e2622;
  --success: #7fb069;
  --cover-1: #7fb069;
  --cover-2: #4a7c59;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  background: #f7f4ed;
  background: var(--bg);
  color: #2c2922;
  color: var(--text);
  transition: background var(--transition), color var(--transition);
  -webkit-transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

button, input, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

button:focus,
input:focus,
select:focus,
textarea:focus {
  outline: none;
}

/* 低版本 WebView / 喵喵机：彻底禁用点击高亮与焦点框 */
* {
  -webkit-tap-highlight-color: transparent;
}

*:active,
*:focus {
  outline: none !important;
  -webkit-tap-highlight-color: transparent !important;
}

/* 喵喵机阅读内容滚动条隐藏 */
.device-miaomiao .reader-content::-webkit-scrollbar {
  display: none;
  width: 0;
  height: 0;
}

/* ===== 喵喵机专用样式：4 英寸 16:9 纵横双适配 ===== */
/* 核心原则：不压缩画面，横屏左右型，竖屏上下型，大触控目标 */
.device-miaomiao {
  font-size: 14px;
  -webkit-text-size-adjust: 100%;
}

.device-miaomiao body {
  overflow: hidden;
  /* 不用 position: fixed，避免老 WebView 中 body 固定层拦截子元素点击/触摸事件 */
  position: relative;
}

.device-miaomiao #app {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
}

/* ===== 喵喵机交互修复：非活动视图/面板彻底隐藏，防止老 WebView 中 pointer-events 失效导致遮挡点击 ===== */
.device-miaomiao .view {
  display: none !important;
}

.device-miaomiao .view.active {
  display: -webkit-box !important;
  display: -webkit-flex !important;
  display: flex !important;
  opacity: 1;
  pointer-events: auto;
  -webkit-transform: translateY(0);
  transform: translateY(0);
}

.device-miaomiao .loader.hidden,
.device-miaomiao .side-panel:not(.open),
.device-miaomiao .toc-panel:not(.open),
.device-miaomiao .modal.hidden,
.device-miaomiao .search-bar.hidden {
  display: none !important;
}

.device-miaomiao #library-view.view.active {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-box-flex: 1;
  -webkit-flex: 1 1 auto;
  flex: 1 1 auto;
  overflow: hidden;
}

/* 顶部导航 */
.device-miaomiao .app-header {
  height: 40px;
  min-height: 40px;
  padding: 0 8px;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
}

.device-miaomiao .brand-logo {
  width: 26px;
  height: 26px;
  border-radius: 7px;
}

.device-miaomiao .brand-logo svg {
  width: 15px;
  height: 15px;
}

.device-miaomiao .brand-text {
  font-size: 13px;
}

.device-miaomiao .header-tabs {
  position: static;
  bottom: auto;
  left: auto;
  right: auto;
  top: auto;
  padding: 2px;
  border-radius: 100px;
  border-top: none;
  background: var(--surface-2);
}

.device-miaomiao .tab {
  padding: 4px 10px;
  font-size: 12px;
}

.device-miaomiao .header-actions {
  gap: 4px;
}

.device-miaomiao .search-box {
  display: none;
}

.device-miaomiao .btn.icon {
  width: 32px;
  height: 32px;
}

.device-miaomiao .btn.icon svg {
  width: 16px;
  height: 16px;
}

/* 书库主体 */
.device-miaomiao .library-main {
  padding: 8px;
  -webkit-box-flex: 1;
  -webkit-flex: 1 1 auto;
  flex: 1 1 auto;
  overflow: hidden;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
}

.device-miaomiao .books-area {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.device-miaomiao .area-toolbar {
  margin-bottom: 8px;
  min-height: 28px;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
}

.device-miaomiao .area-toolbar h2 {
  font-size: 14px;
}

.device-miaomiao .toolbar-right {
  gap: 6px;
}

.device-miaomiao .count-pill {
  padding: 3px 8px;
  font-size: 10px;
}

.device-miaomiao .view-toggle {
  display: none;
}

.device-miaomiao .sort-btn {
  padding: 4px 8px;
  font-size: 11px;
}

.device-miaomiao .book-list {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -webkit-flex-direction: row;
  flex-direction: row;
  -webkit-flex-wrap: nowrap;
  flex-wrap: nowrap;
  gap: 10px;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 8px;
  -webkit-overflow-scrolling: touch;
  -webkit-box-flex: 1;
  -webkit-flex: 1 1 auto;
  flex: 1 1 auto;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
}

.device-miaomiao .book-list.grid,
.device-miaomiao .book-list.list {
  grid-template-columns: none;
}

.device-miaomiao .book-card {
  width: 110px;
  min-width: 110px;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
}

.device-miaomiao .book-cover {
  height: 140px;
  padding: 8px;
}

.device-miaomiao .cover-title {
  font-size: 13px;
  -webkit-line-clamp: 4;
}

.device-miaomiao .book-info {
  padding: 8px;
}

.device-miaomiao .book-info h3 {
  font-size: 11px;
  margin-bottom: 4px;
}

.device-miaomiao .book-meta {
  display: none;
}

.device-miaomiao .book-actions {
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
  gap: 4px;
}

.device-miaomiao .book-actions button {
  padding: 6px 4px;
  font-size: 11px;
  border-radius: var(--radius-xs);
}

.device-miaomiao .upload-area {
  display: none !important;
}

.device-miaomiao .empty-state {
  padding: 40px 16px;
}

.device-miaomiao .empty-illustration {
  width: 56px;
  height: 56px;
}

.device-miaomiao .empty-illustration svg {
  width: 28px;
  height: 28px;
}

.device-miaomiao .empty-state h3 {
  font-size: 14px;
}

.device-miaomiao .empty-state p {
  font-size: 11px;
}

/* 阅读器：默认纵向，横屏分页 */
.device-miaomiao .reader-header {
  height: 38px;
  min-height: 38px;
  padding: 0 8px;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
}

.device-miaomiao .reader-title-wrap h2 {
  font-size: 12px;
}

.device-miaomiao #reader-progress-top {
  display: none;
}

.device-miaomiao .reader-actions {
  gap: 2px;
}

.device-miaomiao .reader-body {
  position: relative;
  overflow: hidden;
  -webkit-box-flex: 1;
  -webkit-flex: 1 1 auto;
  flex: 1 1 auto;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
}

.device-miaomiao .reader-main {
  position: relative;
  overflow: hidden;
  -webkit-box-flex: 1;
  -webkit-flex: 1 1 auto;
  flex: 1 1 auto;
  width: 100%;
  height: 100%;
}

.device-miaomiao .reader-content {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  height: 100%;
  padding: 10px 14px;
  font-size: 15px;
  line-height: 1.7;
  text-align: justify;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-column-width: auto;
  column-width: auto;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
  touch-action: pan-y;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

.device-miaomiao .reader-content p {
  text-indent: 2em;
  margin-bottom: 0.8em;
  word-break: break-word;
  overflow-wrap: break-word;
  -webkit-column-break-inside: avoid;
  break-inside: avoid;
}

.device-miaomiao .reader-content h3 {
  font-size: 1.15em;
  margin: 1.2em 0 0.8em;
  break-before: auto;
  -webkit-column-break-before: auto;
  -webkit-column-break-inside: avoid;
  break-inside: avoid;
}

.device-miaomiao .reader-footer {
  height: 28px;
  min-height: 28px;
  padding: 0 10px;
  gap: 8px;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
}

.device-miaomiao .footer-progress #progress-text {
  font-size: 10px;
  min-width: 32px;
}

.device-miaomiao #chapter-name {
  font-size: 10px;
  max-width: 120px;
}

.device-miaomiao .mobile-toolbar {
  display: none;
}

/* 目录面板 */
.device-miaomiao .toc-panel {
  width: 220px;
  max-width: 70vw;
  top: 38px;
  bottom: 28px;
}

.device-miaomiao .toc-item {
  padding: 8px 10px;
  font-size: 12px;
}

/* 设置面板 */
.device-miaomiao .side-panel {
  width: 100%;
  max-width: 100%;
}

/* 加载失败 */
.device-miaomiao .load-error {
  padding: 40px 16px;
}

.device-miaomiao .load-error h3 {
  font-size: 14px;
}

.device-miaomiao .load-error p {
  font-size: 11px;
}

.device-miaomiao .panel-body {
  padding: 12px;
}

.device-miaomiao .setting-group {
  margin-bottom: 14px;
}

.device-miaomiao .setting-group label {
  font-size: 11px;
  margin-bottom: 6px;
}

.device-miaomiao .theme-option {
  padding: 8px;
  font-size: 12px;
}

.device-miaomiao .range-label span {
  font-size: 12px;
}

.device-miaomiao .setting-actions .btn,
.device-miaomiao .sync-actions .btn {
  padding: 8px 12px;
  font-size: 12px;
}

/* 搜索栏 */
.device-miaomiao .search-bar {
  padding: 6px 8px;
  -webkit-flex-shrink: 0;
  flex-shrink: 0;
}

.device-miaomiao .search-inner input {
  padding: 6px 8px;
  font-size: 12px;
}

.device-miaomiao .search-inner .btn.small {
  padding: 5px 8px;
  font-size: 11px;
}

/* 加载层 */
.device-miaomiao .loader {
  gap: 10px;
}

.device-miaomiao .spinner {
  width: 32px;
  height: 32px;
}

.device-miaomiao .loader p {
  font-size: 12px;
}

/* Toast */
.device-miaomiao .toast {
  bottom: 58px;
  padding: 8px 14px;
  font-size: 12px;
}

/* 删除确认 */
.device-miaomiao .modal-card {
  padding: 16px;
  max-width: 90vw;
}

.device-miaomiao .modal-card h3 {
  font-size: 14px;
}

.device-miaomiao .modal-card p {
  font-size: 12px;
}

/* 强制所有可点击元素最小触控区域 32px */
.device-miaomiao button,
.device-miaomiao .book-card,
.device-miaomiao .drop-zone,
.device-miaomiao .toc-item,
.device-miaomiao .theme-option,
.device-miaomiao .tab,
.device-miaomiao .btn {
  min-height: 32px;
  min-width: 32px;
}

/* 横向书架隐藏滚动条但保留滚动 */
.device-miaomiao .book-list::-webkit-scrollbar {
  display: none;
}

/* ===== 喵喵机横屏：宽短屏，阅读仍上下滑动 ===== */
@media (orientation: landscape) {
  .device-miaomiao .app-header {
    height: 34px;
    min-height: 34px;
  }

  .device-miaomiao .reader-content {
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-column-width: auto;
    column-width: auto;
  }

  .device-miaomiao .toc-panel {
    top: 34px;
    bottom: 28px;
  }

  /* 横屏高度极小，进一步压缩书库，确保操作按钮可见 */
  .device-miaomiao .app-header {
    height: 34px;
    min-height: 34px;
    padding: 0 6px;
  }

  .device-miaomiao .brand-logo {
    width: 22px;
    height: 22px;
    border-radius: 6px;
  }

  .device-miaomiao .brand-logo svg {
    width: 13px;
    height: 13px;
  }

  .device-miaomiao .brand-text {
    font-size: 11px;
  }

  .device-miaomiao .tab {
    padding: 3px 8px;
    font-size: 11px;
  }

  .device-miaomiao .btn.icon {
    width: 28px;
    height: 28px;
  }

  .device-miaomiao .btn.icon svg {
    width: 14px;
    height: 14px;
  }

  .device-miaomiao .library-main {
    padding: 6px;
  }

  .device-miaomiao .area-toolbar {
    margin-bottom: 4px;
    min-height: 22px;
  }

  .device-miaomiao .area-toolbar h2 {
    font-size: 12px;
  }

  .device-miaomiao .count-pill {
    padding: 2px 6px;
    font-size: 9px;
  }

  .device-miaomiao .sort-btn {
    padding: 3px 6px;
    font-size: 10px;
  }

  .device-miaomiao .book-list {
    gap: 8px;
    padding-bottom: 4px;
  }

  .device-miaomiao .book-card {
    width: 86px;
    min-width: 86px;
  }

  .device-miaomiao .book-cover {
    height: calc(100vh - 84px);
    max-height: 110px;
    min-height: 64px;
    padding: 4px;
  }

  .device-miaomiao .cover-title {
    font-size: 11px;
    -webkit-line-clamp: 3;
  }

  .device-miaomiao .book-info {
    padding: 4px;
  }

  .device-miaomiao .book-info h3 {
    font-size: 10px;
    margin-bottom: 2px;
  }

  .device-miaomiao .book-actions {
    gap: 2px;
  }

  .device-miaomiao .book-actions button {
    padding: 4px 2px;
    font-size: 10px;
  }
}

/* ===== 喵喵机竖屏：窄长高屏，上下型 ===== */
@media (orientation: portrait) {
  .device-miaomiao .app-header {
    height: auto;
    min-height: 34px;
    padding: 4px 8px;
  }

  .device-miaomiao .brand-text {
    display: none;
  }

  .device-miaomiao .header-tabs {
    margin: 0 auto;
  }

  .device-miaomiao .tab {
    padding: 3px 8px;
    font-size: 11px;
  }

  .device-miaomiao .btn.icon {
    width: 30px;
    height: 30px;
  }

  .device-miaomiao .btn.icon svg {
    width: 15px;
    height: 15px;
  }

  .device-miaomiao .book-list {
    -webkit-box-align: start;
    -webkit-align-items: flex-start;
    align-items: flex-start;
  }

  .device-miaomiao .book-card {
    width: 96px;
    min-width: 96px;
  }

  .device-miaomiao .book-cover {
    height: 120px;
  }

  .device-miaomiao .reader-header {
    height: 34px;
    min-height: 34px;
  }

  .device-miaomiao .reader-title-wrap h2 {
    font-size: 11px;
  }

  .device-miaomiao .reader-content {
    padding: 8px 12px;
    font-size: 14px;
    line-height: 1.65;
  }

  .device-miaomiao .reader-footer {
    height: 24px;
    min-height: 24px;
    padding: 0 8px;
  }

  .device-miaomiao .toc-panel {
    width: 100%;
    max-width: 100%;
    top: 34px;
    bottom: 24px;
  }
}

/* 超小屏喵喵机再精简 */
@media (max-width: 360px) and (max-height: 220px) {
  .device-miaomiao .book-card {
    width: 90px;
    min-width: 90px;
  }

  .device-miaomiao .book-cover {
    height: 110px;
  }

  .device-miaomiao .reader-content {
    font-size: 13px;
    line-height: 1.6;
  }

  .device-miaomiao .reader-header {
    height: 34px;
    min-height: 34px;
  }

  .device-miaomiao .reader-footer {
    height: 24px;
    min-height: 24px;
  }
}

button::-moz-focus-inner {
  border: 0;
}

input, select, textarea {
  -webkit-tap-highlight-color: transparent;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-3); border-radius: 3px; opacity: 0.4; }
::-webkit-scrollbar-thumb:hover { background: var(--text-2); }

.hidden { display: none !important; }

/* ===== 设备选择启动界面 ===== */
html.device-selector-hidden .device-selector {
  display: none !important;
}

.device-selector {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  padding: 20px;
  background: var(--device-selector-bg);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.device-selector-card {
  width: 100%;
  max-width: 480px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.25s ease-out;
}

.device-selector-title {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text);
}

.device-selector-sub {
  font-size: 14px;
  color: var(--text-2);
  margin-bottom: 28px;
}

.device-selector-options {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
}

.device-option {
  -webkit-box-flex: 1;
  -webkit-flex: 1 1 0;
  flex: 1 1 0;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  gap: 10px;
  padding: 24px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  color: var(--text);
  -webkit-transition: all var(--transition);
  transition: all var(--transition);
  cursor: pointer;
}

.device-option:hover,
.device-option:active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
  -webkit-transform: translateY(-2px);
  transform: translateY(-2px);
}

.device-option-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  color: var(--primary);
}

.device-option-icon svg {
  width: 28px;
  height: 28px;
}

.device-option-name {
  font-size: 16px;
  font-weight: 700;
}

.device-option-desc {
  font-size: 12px;
  color: var(--text-3);
  line-height: 1.4;
}

.device-option:hover .device-option-desc,
.device-option:active .device-option-desc {
  color: var(--primary);
}

.device-selector-hint {
  font-size: 12px;
  color: var(--text-3);
}

/* ===== 通用按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid transparent;
}

.btn:hover { background: var(--surface-3); }

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

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

.btn.danger {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.btn.danger:hover { filter: brightness(1.1); }

.btn.icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  flex-shrink: 0;
}

.btn.small { padding: 6px 12px; font-size: 13px; }

.btn svg { width: 18px; height: 18px; }

/* ===== 加载层 ===== */
.loader {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 500;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  gap: 18px;
  background: rgba(0,0,0,0.55);
  color: #fff;
}

.spinner {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(255,255,255,0.25);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 视图切换 ===== */
.view {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
  opacity: 0;
  pointer-events: none;
  -webkit-transform: translateY(12px);
  transform: translateY(12px);
  -webkit-transition: opacity var(--transition), -webkit-transform var(--transition);
  transition: opacity var(--transition), transform var(--transition);
}

.view.active {
  opacity: 1;
  pointer-events: auto;
  -webkit-transform: translateY(0);
  transform: translateY(0);
}

/* ===== 顶部导航 ===== */
.app-header {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  gap: 20px;
  z-index: 50;
}

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

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}

.brand-logo svg { width: 22px; height: 22px; }

.brand-text {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-tabs {
  display: flex;
  align-items: center;
  background: var(--surface-2);
  border-radius: 100px;
  padding: 4px;
}

.tab {
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-2);
  transition: all var(--transition);
}

.tab:hover { color: var(--text); }

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

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

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 100px;
  min-width: 240px;
  transition: all var(--transition);
}

.search-box:focus-within {
  border-color: var(--primary);
  background: var(--surface);
}

.search-box svg { width: 18px; height: 18px; color: var(--text-3); flex-shrink: 0; }

.search-box input {
  flex: 1;
  border: none;
  background: transparent;
  outline: none;
  font-size: 14px;
  min-width: 0;
}

/* ===== 书库主体 ===== */
.library-main {
  flex: 1;
  overflow-y: auto;
  padding: 28px;
}

/* ===== 上传区 ===== */
.upload-area {
  max-width: 720px;
  margin: 0 auto;
}

.drop-zone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 64px 32px;
  text-align: center;
  transition: all var(--transition);
  overflow: hidden;
}

.drop-zone.dragover,
.drop-zone:hover {
  border-color: var(--primary);
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.drop-zone input {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
  z-index: 2;
}

.drop-zone-inner {
  position: relative;
  z-index: 1;
  pointer-events: none;
}

.upload-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.upload-icon svg { width: 32px; height: 32px; }

.drop-zone h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.drop-zone p { font-size: 14px; color: var(--text-3); margin-bottom: 20px; }
.upload-btn { pointer-events: auto; }

.upload-progress {
  position: relative;
  z-index: 3;
  max-width: 420px;
  margin: 24px auto 0;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 13px;
}

.progress-info #progress-file { color: var(--text-2); }
.progress-info #progress-text { color: var(--primary); font-weight: 600; }

.progress-track {
  height: 6px;
  background: var(--surface-3);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--primary), var(--primary-hover));
  border-radius: 3px;
  transition: width 0.15s linear;
}

.upload-tips {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}

.tip {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-2);
}

.tip svg { width: 18px; height: 18px; color: var(--primary); flex-shrink: 0; }

/* ===== 书库区 ===== */
.books-area {
  max-width: 1200px;
  margin: 0 auto;
}

.area-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 16px;
}

.area-toolbar h2 { font-size: 22px; font-weight: 800; }

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.count-pill {
  padding: 5px 12px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
}

.view-toggle {
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--surface-2);
  border-radius: 100px;
}

.view-toggle .btn {
  width: 34px;
  height: 34px;
  background: transparent;
}

.view-toggle .btn.active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.sort-btn {
  gap: 6px;
  padding: 8px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.sort-btn svg { width: 16px; height: 16px; }

/* ===== 书籍列表 ===== */
.book-list {
  display: grid;
  gap: 24px;
}

.book-list.grid {
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

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

.book-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
}

.book-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.book-list.list .book-card {
  display: flex;
  align-items: stretch;
  padding: 16px;
  gap: 18px;
}

.book-cover {
  position: relative;
  height: 220px;
  background: linear-gradient(145deg, var(--cover-1), var(--cover-2));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  color: #fff;
  overflow: hidden;
}

.book-list.list .book-cover {
  width: 72px;
  height: 96px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.cover-pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0.15;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.3) 0%, transparent 25%),
    radial-gradient(circle at 80% 70%, rgba(0,0,0,0.15) 0%, transparent 25%);
}

.cover-title {
  position: relative;
  z-index: 1;
  font-size: 17px;
  font-weight: 700;
  text-align: center;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
  overflow: hidden;
  word-break: break-all;
  text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.book-list.list .cover-title {
  font-size: 12px;
  -webkit-line-clamp: 4;
}

.card-progress {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 12px;
  height: 4px;
  background: rgba(255,255,255,0.3);
  border-radius: 2px;
  z-index: 1;
}

.card-progress-bar {
  height: 100%;
  background: #fff;
  border-radius: 2px;
}

.book-info { padding: 18px; flex: 1; min-width: 0; }

.book-list.list .book-info { padding: 0; display: flex; flex-direction: column; justify-content: center; }

.book-info h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.book-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-3);
  margin-bottom: 14px;
}

.book-meta .dot { opacity: 0.6; }

.book-actions {
  display: flex;
  gap: 8px;
}

.book-actions button {
  flex: 1;
  padding: 8px 10px;
  border-radius: var(--radius-xs);
  font-size: 12px;
  font-weight: 600;
  background: var(--surface-2);
  transition: all var(--transition);
}

.book-actions button:hover { background: var(--surface-3); }

.book-actions .btn-read { color: var(--primary); }
.book-actions .btn-delete { color: var(--danger); }

.book-list.list .book-actions {
  margin-top: auto;
  flex: 0 0 auto;
}

.book-list.list .book-actions button {
  flex: 0 0 auto;
  padding: 8px 16px;
}

/* ===== 空状态 ===== */
.empty-state {
  text-align: center;
  padding: 100px 20px;
  color: var(--text-2);
}

.empty-illustration {
  width: 96px;
  height: 96px;
  margin: 0 auto 24px;
  border-radius: 50%;
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
}

.empty-illustration svg { width: 44px; height: 44px; }

.empty-state h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.empty-state p { font-size: 14px; color: var(--text-3); margin-bottom: 24px; }
.empty-hint-miaomiao { display: none; }
.device-miaomiao .empty-hint-mobile { display: none; }
.device-miaomiao .empty-hint-miaomiao { display: block; }
.device-miaomiao #empty-upload { display: none; }

/* ===== 加载失败状态 ===== */
.load-error {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-2);
}

.load-error h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.load-error p { font-size: 13px; color: var(--text-3); margin-bottom: 20px; }

/* ===== 阅读视图 ===== */
.reader-header {
  height: var(--reader-header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  gap: 14px;
  z-index: 40;
}

.reader-title-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-width: 0;
}

.reader-title-wrap h2 {
  font-size: 16px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#reader-progress-top {
  padding: 3px 8px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
  flex-shrink: 0;
}

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

.search-bar {
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.search-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 760px;
  margin: 0 auto;
}

.search-inner svg { width: 18px; height: 18px; color: var(--text-3); flex-shrink: 0; }

.search-inner input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--reader-bg);
  outline: none;
  font-size: 14px;
  min-width: 0;
}

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

.search-count {
  font-size: 13px;
  color: var(--text-2);
  white-space: nowrap;
}

.reader-body {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
}

.toc-panel {
  position: fixed;
  top: var(--reader-header-h);
  left: 0;
  bottom: var(--reader-footer-h);
  width: 320px;
  max-width: 85vw;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  -webkit-flex-direction: column;
  flex-direction: column;
  -webkit-transform: translateX(-100%);
  transform: translateX(-100%);
  -webkit-transition: -webkit-transform var(--transition);
  transition: transform var(--transition);
  z-index: 110;
  box-shadow: var(--shadow-lg);
}

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

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}

.panel-header h3 { font-size: 16px; font-weight: 700; }

.toc-list {
  flex: 1;
  overflow-y: auto;
  padding: 14px;
}

.toc-item {
  width: 100%;
  text-align: left;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-2);
  margin-bottom: 4px;
  transition: all var(--transition);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toc-item:hover,
.toc-item.active {
  background: var(--primary-light);
  color: var(--primary);
}

.reader-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--reader-bg);
  position: relative;
  overflow: hidden;
}

.reader-content {
  flex: 1;
  overflow-y: auto;
  padding: 36px var(--reader-margin, 24px);
  font-size: var(--reader-font-size, 18px);
  line-height: var(--reader-line-height, 1.8);
  font-family: var(--reader-font, -apple-system, BlinkMacSystemFont, 'PingFang SC', serif);
  color: var(--text);
  scroll-behavior: smooth;
  position: relative;
}

.reader-content p {
  margin-bottom: var(--reader-para-gap, 1em);
  text-align: var(--reader-align, justify);
  text-indent: 2em;
  word-break: break-word;
  -webkit-hyphens: auto;
  hyphens: auto;
}

.reader-content h3 {
  font-size: 1.3em;
  font-weight: 800;
  margin: 1.8em 0 1em;
  color: var(--text);
  scroll-margin-top: calc(var(--reader-header-h) + 20px);
}

.reader-content .search-highlight {
  background: var(--primary-light);
  border-radius: 2px;
  padding: 0 2px;
}

.reader-content .search-highlight.active {
  background: var(--primary);
  color: #fff;
}

.reader-footer {
  height: var(--reader-footer-h);
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 20px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  z-index: 40;
}

.footer-progress {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-progress .progress-track {
  flex: 1;
  height: 4px;
}

.footer-progress #progress-text {
  font-size: 12px;
  color: var(--text-3);
  min-width: 40px;
  text-align: right;
}

#chapter-name {
  font-size: 12px;
  color: var(--text-2);
  max-width: 220px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== 侧边面板（设置/快捷键） ===== */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.2);
  z-index: 90;
}

.side-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 380px;
  max-width: 92vw;
  background: var(--surface);
  border-left: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  -webkit-transform: translateX(100%);
  transition: transform var(--transition), -webkit-transform var(--transition);
}

.side-panel.open {
  -webkit-transform: translateX(0);
  transform: translateX(0);
}

.panel-body { padding: 22px; overflow-y: auto; }

.setting-group { margin-bottom: 26px; }
.setting-group:last-of-type { margin-bottom: 0; }

.setting-group label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-2);
  margin-bottom: 12px;
}

.setting-group.checkbox label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.theme-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.theme-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 13px;
  font-weight: 600;
  transition: all var(--transition);
}

.theme-option.active,
.theme-option:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.theme-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border);
}

.theme-dot.cream { background: #f7f4ed; }
.theme-dot.paper { background: #ffffff; }
.theme-dot.ink { background: #121418; }
.theme-dot.forest { background: #1a211d; }

.setting-group select {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  outline: none;
  font-size: 14px;
}

.range-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.range-label span { font-size: 13px; color: var(--text-2); font-weight: 600; }

.setting-group input[type='range'] {
  width: 100%;
  accent-color: var(--primary);
  height: 4px;
}

.setting-group input[type='checkbox'] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

.sync-hint {
  font-size: 12px;
  color: var(--text-3);
  line-height: 1.5;
  margin: -6px 0 12px;
}

.sync-input-wrap {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.sync-input-wrap input {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  font-size: 13px;
  color: var(--text);
  outline: none;
}

.sync-input-wrap input:focus { border-color: var(--primary); }

.sync-actions {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
  gap: 8px;
}

.sync-actions .btn {
  -webkit-box-flex: 1;
  -webkit-flex: 1 1 auto;
  flex: 1 1 auto;
  min-width: 80px;
}

.sync-toggle {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  -webkit-box-flex: 1;
  -webkit-flex: 1 1 auto;
  flex: 1 1 auto;
  min-width: 100px;
}

.sync-toggle input {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  margin: 0;
}

.sync-status {
  margin-top: 10px;
  font-size: 12px;
  min-height: 18px;
  color: var(--text-3);
}

.sync-status.success { color: var(--success); }
.sync-status.error { color: var(--danger); }

.setting-actions {
  display: flex;
  gap: 10px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.setting-actions .btn {
  flex: 1;
  border: 1px solid var(--border);
}

.device-switch-group {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.device-switch-group .btn {
  width: 100%;
  border: 1px solid var(--border);
}

.shortcuts-list { display: flex; flex-direction: column; gap: 12px; }

.shortcut-item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 14px;
  color: var(--text-2);
}

.shortcut-item kbd {
  min-width: 60px;
  padding: 7px 10px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-family: ui-monospace, monospace;
  font-size: 12px;
  text-align: center;
  box-shadow: 0 2px 0 var(--border);
}

/* ===== 删除确认弹窗 ===== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  padding: 20px;
  background: rgba(0,0,0,0.45);
}

.modal-card {
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.2s ease-out;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-card h3 { font-size: 18px; font-weight: 800; margin-bottom: 10px; }
.modal-card p { font-size: 14px; color: var(--text-2); line-height: 1.6; margin-bottom: 20px; }
.modal-card p span { color: var(--text); font-weight: 600; }

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* ===== 移动端底部工具栏 ===== */
.mobile-toolbar {
  display: none;
  height: var(--mobile-toolbar-h);
  background: var(--surface);
  border-top: 1px solid var(--border);
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-box-pack: justify;
  -webkit-justify-content: space-around;
  justify-content: space-around;
  padding: 0 8px;
  z-index: 45;
}

.mobile-toolbar button {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 6px 12px;
  color: var(--text-2);
  font-size: 11px;
}

.mobile-toolbar button svg { width: 20px; height: 20px; }

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 13px 24px;
  border-radius: 100px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  font-size: 14px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
  z-index: 300;
  max-width: 90vw;
}

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

.toast.error {
  background: #fef2f2;
  color: #991b1b;
  border-color: #fecaca;
}

/* ===== 响应式 ===== */

/* 平板 / 小桌面 */
@media (max-width: 1024px) {
  .app-header {
    padding: 0 18px;
  }

  .library-main {
    padding: 22px;
  }

  .book-list.grid {
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  }
}

/* 手机横屏 / 大屏手机 */
@media (max-width: 900px) {
  .app-header {
    padding: 0 14px;
    height: 60px;
  }

  .brand-text { display: none; }

  .header-tabs {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    top: auto;
    border-radius: 0;
    padding: 6px 16px;
    padding-bottom: 6px;
    padding-bottom: calc(6px + env(safe-area-inset-bottom, 0px));
    background: var(--surface);
    border-top: 1px solid var(--border);
    z-index: 60;
    -webkit-box-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
  }

  .tab {
    -webkit-box-flex: 1;
    -webkit-flex: 1;
    flex: 1;
    text-align: center;
    padding: 10px 8px;
  }

  .library-main {
    padding: 14px 14px calc(14px + 70px);
  }

  .search-box {
    min-width: auto;
    width: 40px;
    padding: 9px;
  }

  .search-box input { display: none; }

  .upload-area {
    padding-bottom: 70px;
  }

  .upload-tips { grid-template-columns: 1fr; }

  .book-list.grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 14px;
  }

  .book-cover { height: 170px; }
  .book-info { padding: 12px; }

  .area-toolbar {
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
    gap: 10px;
  }

  .reader-header { padding: 0 10px; }
  .reader-title-wrap h2 { font-size: 14px; }
  #reader-progress-top { display: none; }
  .reader-actions .btn.icon { width: 36px; height: 36px; }

  .reader-footer { display: none; }
  .mobile-toolbar {
    display: -webkit-box;
    display: -webkit-flex;
    display: flex;
  }

  .reader-content {
    padding: 20px var(--reader-margin, 16px) calc(20px + 70px);
  }

  .side-panel { width: 100%; max-width: 100%; }
  .toc-panel {
    width: 280px;
    max-width: 80vw;
    bottom: var(--mobile-toolbar-h);
  }
}

/* 小屏手机 */
@media (max-width: 480px) {
  .book-list.grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .book-cover { height: 150px; }
  .cover-title { font-size: 13px; }
  .book-info h3 { font-size: 13px; }

  .toolbar-right {
    width: 100%;
    -webkit-box-pack: justify;
    -webkit-justify-content: space-between;
    justify-content: space-between;
  }

  .search-inner {
    -webkit-flex-wrap: wrap;
    flex-wrap: wrap;
    gap: 8px;
  }

  .search-inner input { width: 100%; -webkit-order: -1; order: -1; }
  .search-count { margin-left: auto; }

  .drop-zone { padding: 44px 20px; }
  .drop-zone h3 { font-size: 17px; }
}

/* 超小屏手机 */
@media (max-width: 360px) {
  .book-list.grid {
    grid-template-columns: 1fr;
  }

  .book-cover { height: 180px; }

  .header-tabs .tab {
    padding: 10px 4px;
    font-size: 13px;
  }
}

/* 手机横屏：优先显示更多内容 */
@media (max-height: 500px) and (orientation: landscape) {
  .app-header { height: 52px; }
  .reader-header { height: 52px; }
  .mobile-toolbar { height: 52px; }
  .book-cover { height: 140px; }
}

/* 低版本浏览器 / 无 CSS 变量支持兜底 */
.no-cssvars .app-header,
.no-cssvars .reader-header,
.no-cssvars .mobile-toolbar,
.no-cssvars .side-panel,
.no-cssvars .toc-panel,
.no-cssvars .modal-card,
.no-cssvars .upload-progress,
.no-cssvars .search-bar,
.no-cssvars .reader-footer,
.no-cssvars .book-card,
.no-cssvars .drop-zone,
.no-cssvars .tip,
.no-cssvars .empty-illustration {
  background: #232b26;
  color: #e6ebe8;
  border-color: #2f3a34;
}

.no-cssvars .library-main,
.no-cssvars .reader-main,
.no-cssvars .reader-content,
.no-cssvars body {
  background: #1a211d;
  color: #e6ebe8;
}

.no-cssvars .btn.primary {
  background: #7fb069;
  color: #1a211d;
}

.no-cssvars .search-highlight {
  background: #2a3a28;
}

.no-cssvars .search-highlight.active {
  background: #7fb069;
  color: #1a211d;
}

/* 低版本浏览器 / 不支持 flex gap 的 WebView 兜底 */
@supports not (gap: 1px) {
  .app-header,
  .reader-header,
  .reader-title-wrap,
  .reader-actions,
  .reader-footer,
  .footer-progress,
  .search-inner,
  .brand,
  .header-actions,
  .search-box,
  .area-toolbar,
  .toolbar-right,
  .view-toggle,
  .tip,
  .book-card,
  .book-meta,
  .book-actions,
  .setting-actions,
  .theme-option,
  .shortcut-item,
  .shortcuts-list,
  .modal-actions,
  .mobile-toolbar button,
  .sync-input-wrap,
  .sync-actions,
  .sync-toggle {
    gap: 0;
  }

  .app-header > * { margin-right: 20px; }
  .app-header > *:last-child { margin-right: 0; }

  .reader-header > * { margin-right: 14px; }
  .reader-header > *:last-child { margin-right: 0; }

  .reader-title-wrap > * { margin-right: 12px; }
  .reader-title-wrap > *:last-child { margin-right: 0; }

  .reader-actions > * { margin-right: 6px; }
  .reader-actions > *:last-child { margin-right: 0; }

  .reader-footer > * { margin-right: 14px; }
  .reader-footer > *:last-child { margin-right: 0; }

  .footer-progress > * { margin-right: 12px; }
  .footer-progress > *:last-child { margin-right: 0; }

  .search-inner > * { margin-right: 10px; }
  .search-inner > *:last-child { margin-right: 0; }

  .brand > * { margin-right: 12px; }
  .brand > *:last-child { margin-right: 0; }

  .header-actions > * { margin-right: 12px; }
  .header-actions > *:last-child { margin-right: 0; }

  .search-box > * { margin-right: 10px; }
  .search-box > *:last-child { margin-right: 0; }

  .area-toolbar > * { margin-right: 16px; }
  .area-toolbar > *:last-child { margin-right: 0; }

  .toolbar-right > * { margin-right: 12px; }
  .toolbar-right > *:last-child { margin-right: 0; }

  .view-toggle > * { margin-right: 4px; }
  .view-toggle > *:last-child { margin-right: 0; }

  .tip > * { margin-right: 10px; }
  .tip > *:last-child { margin-right: 0; }

  .book-list.list .book-card > * { margin-right: 18px; }
  .book-list.list .book-card > *:last-child { margin-right: 0; }

  .book-meta > * { margin-right: 8px; }
  .book-meta > *:last-child { margin-right: 0; }

  .book-actions > * { margin-right: 8px; }
  .book-actions > *:last-child { margin-right: 0; }

  .setting-actions > * { margin-right: 10px; }
  .setting-actions > *:last-child { margin-right: 0; }

  .theme-option > * { margin-right: 10px; }
  .theme-option > *:last-child { margin-right: 0; }

  .shortcut-item > * { margin-right: 14px; }
  .shortcut-item > *:last-child { margin-right: 0; }

  .shortcuts-list > * { margin-bottom: 12px; }
  .shortcuts-list > *:last-child { margin-bottom: 0; }

  .modal-actions > * { margin-right: 10px; }
  .modal-actions > *:last-child { margin-right: 0; }

  .mobile-toolbar button > * { margin-bottom: 3px; }

  .sync-input-wrap > * { margin-right: 8px; }
  .sync-input-wrap > *:last-child { margin-right: 0; }

  .sync-actions > * { margin-right: 8px; margin-bottom: 8px; }

  .sync-toggle > * { margin-right: 8px; }
  .sync-toggle > *:last-child { margin-right: 0; }

  /* grid gap 兜底 */
  .upload-tips { grid-gap: 16px; }
  .theme-grid { grid-gap: 10px; }
  .book-list.grid { grid-gap: 24px; }
}

/* 低版本 WebView 额外修复：禁止点击高亮框 */
* {
  -webkit-tap-highlight-color: transparent;
}

*:focus {
  outline: none;
}

/* 为键盘用户提供微弱焦点提示，但避免点击出现方框 */
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

button:focus,
input:focus,
select:focus,
textarea:focus {
  outline: none;
}