/* ============================================================
   网页小说阅读器 — 样式
   设计：现代阅读应用风格（渐变主色 / 毛玻璃 / 精致动效）
   桌面端 + 移动端适配（底部 Tab 导航 / safe-area / 大触控目标）
   ============================================================ */
* { box-sizing: border-box; margin: 0; padding: 0; }

/* ---------- 设计 Token ---------- */
:root {
  --bg: #f5f6fa;
  --bg-grad: radial-gradient(1200px 600px at 15% -10%, rgba(106,141,255,0.10), transparent 60%),
             radial-gradient(1000px 500px at 90% 0%, rgba(139,92,246,0.08), transparent 55%);
  --card-bg: #ffffff;
  --card-hover-bg: #fbfcff;
  --text: #23262f;
  --text-light: #6b7280;
  --text-faint: #9ca3af;
  --border: #e8eaf1;
  --primary: #6a8dff;
  --primary-2: #8b5cf6;
  --primary-grad: linear-gradient(135deg, #6a8dff 0%, #8b5cf6 100%);
  --primary-soft: rgba(106,141,255,0.12);
  --success: #1a7f37;
  --success-soft: rgba(26,127,55,0.12);
  --danger: #e5484d;
  --danger-soft: rgba(229,72,77,0.12);
  --radius: 10px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 2px rgba(20,25,40,0.04);
  --shadow: 0 2px 10px rgba(20,25,40,0.06);
  --shadow-md: 0 6px 20px rgba(20,25,40,0.08);
  --shadow-lg: 0 16px 40px rgba(20,25,40,0.14);
  --ring: 0 0 0 3px rgba(106,141,255,0.25);
  --navbar-h: 60px;
  --transition: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  /* 安全区域（刘海屏/底部横条） */
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
[data-theme="dark"] {
  --bg: #131418;
  --bg-grad: radial-gradient(1200px 600px at 15% -10%, rgba(106,141,255,0.12), transparent 60%),
             radial-gradient(1000px 500px at 90% 0%, rgba(139,92,246,0.10), transparent 55%);
  --card-bg: #1e2027;
  --card-hover-bg: #232631;
  --text: #e6e8ee;
  --text-light: #a0a4b0;
  --text-faint: #6b7080;
  --border: #2c2f3a;
  --primary: #7fa0ff;
  --primary-2: #a78bfa;
  --primary-soft: rgba(127,160,255,0.16);
  --success: #4ade80;
  --success-soft: rgba(74,222,128,0.14);
  --danger: #f87171;
  --danger-soft: rgba(248,113,113,0.14);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow: 0 2px 10px rgba(0,0,0,0.35);
  --shadow-md: 0 6px 20px rgba(0,0,0,0.45);
  --shadow-lg: 0 16px 40px rgba(0,0,0,0.55);
  --ring: 0 0 0 3px rgba(127,160,255,0.3);
}

/* ---------- 基础 ---------- */
html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body {
  background-image: var(--bg-grad);
  background-attachment: fixed;
  /* 防止 iOS 上点击输入框/按钮时的灰色高亮 */
  -webkit-tap-highlight-color: transparent;
}
button, input, select { font-family: inherit; }
::selection { background: rgba(106,141,255,0.28); }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(120,130,150,0.35);
  border-radius: 6px;
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background: rgba(120,130,150,0.55); background-clip: content-box; }

/* ---------- 按钮 ---------- */
button {
  background: var(--primary-grad);
  color: #fff;
  border: none;
  padding: 9px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition), filter var(--transition);
  white-space: nowrap;
  touch-action: manipulation; /* 移动端消除 300ms 点击延迟 */
}
button:hover { opacity: 0.92; box-shadow: var(--shadow-md); transform: translateY(-1px); filter: saturate(1.08); }
button:active { transform: translateY(0) scale(0.97); }
button:disabled { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }
button:focus-visible { outline: none; box-shadow: var(--ring); }

/* 输入控件 */
.select, input[type=text], input[type=url], input[type=search] {
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
  touch-action: manipulation;
}
.select:hover, input[type=text]:hover { border-color: #c9cede; }
.select:focus, input[type=text]:focus, input[type=url]:focus, input[type=search]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--ring);
}
.select { cursor: pointer; }
input::placeholder { color: var(--text-faint); }

/* checkbox / range 用系统主题色（跨浏览器） */
input[type=checkbox], input[type=range] { accent-color: var(--primary); cursor: pointer; }
input[type=checkbox] { width: 16px; height: 16px; }

/* ---------- 导航 ---------- */
.navbar {
  display: flex;
  align-items: center;
  height: calc(var(--navbar-h) + var(--safe-top));
  padding: var(--safe-top) 36px 0;
  background: var(--card-bg);
  background: color-mix(in srgb, var(--card-bg) 78%, transparent);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-brand {
  font-size: 19px;
  font-weight: 800;
  margin-right: 36px;
  cursor: pointer;
  letter-spacing: 0.3px;
  background: var(--primary-grad);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: opacity var(--transition);
  white-space: nowrap;
}
.nav-brand:hover { opacity: 0.8; }
.nav-menu {
  list-style: none;
  display: flex;
  gap: 6px;
  flex: 1;
}
.nav-menu li {
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  color: var(--text-light);
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition);
  user-select: none;
  touch-action: manipulation;
}
.nav-menu li:hover { background: var(--primary-soft); color: var(--primary); }
.nav-menu li.active {
  background: var(--primary-grad);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.nav-theme button {
  width: 38px; height: 38px;
  padding: 0;
  border-radius: 50%;
  background: var(--card-bg);
  color: var(--text);
  font-size: 17px;
  box-shadow: var(--shadow-sm);
}
.nav-theme button:hover { box-shadow: var(--shadow-md); transform: rotate(12deg); }

/* ---------- 页面 ---------- */
.page {
  max-width: 1200px;
  margin: 28px auto;
  padding: 0 28px;
  display: none;
  animation: pageIn 0.25s ease both;
}
.page.active { display: block; }
@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
.page-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}
.page-header h2 {
  font-size: 23px;
  font-weight: 700;
  letter-spacing: 0.2px;
}
.page-header h2::after {
  content: '';
  display: block;
  width: 36px;
  height: 4px;
  margin-top: 6px;
  border-radius: 2px;
  background: var(--primary-grad);
}
.page-sub { color: var(--text-light); font-size: 13px; margin-top: 2px; }
.actions { margin-left: auto; display: flex; gap: 10px; }

/* ---------- 直链导入栏 ---------- */
.import-url-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}
.import-url-bar input {
  flex: 1;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 13px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.import-url-bar input:focus { outline: none; border-color: var(--primary); box-shadow: var(--ring); }
.import-url-bar button { white-space: nowrap; }

/* ---------- 书源工具栏 ---------- */
.sources-toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 18px;
  margin-bottom: 10px;
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  flex-wrap: wrap;
}
.sources-toolbar .checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
}
.sources-toolbar .toolbar-info {
  font-size: 12px;
  color: var(--text-light);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.sources-toolbar .toolbar-spacer { flex: 1; }
.sources-toolbar button {
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 7px;
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}
.sources-toolbar button:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.sources-toolbar .btn-danger { background: var(--danger-soft); color: var(--danger); border-color: transparent; }
.sources-toolbar .btn-danger:hover { background: var(--danger); color: #fff; }
.sources-toolbar button:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- 书源卡片 ---------- */
.source-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.source-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: #c9cede; }
.source-card.invalid { border-color: color-mix(in srgb, var(--danger) 45%, transparent); background: var(--danger-soft); }
.source-card.valid { border-color: color-mix(in srgb, var(--success) 40%, transparent); }
.source-card .source-checkbox { margin: 0; cursor: pointer; flex-shrink: 0; width: 18px; height: 18px; }
.source-card .source-info { flex: 1; min-width: 0; }
.source-card .source-name {
  font-weight: 600;
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.source-card .source-url {
  color: var(--text-light);
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.source-card .source-status {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  flex-shrink: 0;
}
.source-card .source-status.testing { background: var(--bg); color: var(--text-light); }
.source-card .source-status.valid { background: var(--success-soft); color: var(--success); }
.source-card .source-status.invalid { background: var(--danger-soft); color: var(--danger); }
.source-card .source-status.untested { display: none; }
.source-card button {
  background: transparent;
  color: var(--danger);
  border: 1px solid color-mix(in srgb, var(--danger) 35%, transparent);
  padding: 4px 12px;
  font-size: 12px;
  border-radius: 7px;
  box-shadow: none;
  flex-shrink: 0;
}
.source-card button:hover { background: var(--danger); color: #fff; }

/* ---------- 书籍网格 ---------- */
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(152px, 1fr));
  gap: 18px;
}
.book-card {
  background: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  position: relative;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
  touch-action: manipulation;
}
.book-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.book-card:active { transform: scale(0.97); }
.book-cover {
  width: 100%;
  aspect-ratio: 3/4;
  background: linear-gradient(150deg, #dbe3f5 0%, #e8e0f5 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #8a94b0;
  font-size: 13px;
  overflow: hidden;
}
[data-theme="dark"] .book-cover {
  background: linear-gradient(150deg, #2a2d3a 0%, #322f45 100%);
  color: #7d8296;
}
.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}
.book-card:hover .book-cover img { transform: scale(1.05); }
.book-info { padding: 10px 12px 12px; }
.book-name {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
}
.book-author {
  font-size: 12px;
  color: var(--text-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 3px;
}
.book-source-tag {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(15, 18, 30, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  z-index: 4;
}
.book-progress, .book-last {
  font-size: 11px;
  color: var(--primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 5px;
  font-weight: 500;
}
.book-last { color: var(--text-light); font-weight: normal; }
.shelf-remove-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 24px;
  height: 24px;
  padding: 0;
  background: rgba(15, 18, 30, 0.55);
  color: #fff;
  border: none;
  border-radius: 50%;
  font-size: 11px;
  line-height: 1;
  opacity: 0;
  transition: opacity var(--transition), background var(--transition), transform var(--transition);
  z-index: 5;
  box-shadow: none;
}
.book-card:hover .shelf-remove-btn { opacity: 1; }
.shelf-remove-btn:hover { background: var(--danger); opacity: 1 !important; transform: scale(1.1); }

/* ---------- 分类标签 ---------- */
.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}
.category-tag {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 7px 16px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-light);
  transition: all var(--transition);
  user-select: none;
  touch-action: manipulation;
}
.category-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
  transform: translateY(-1px);
}
.category-tag.active {
  background: var(--primary-grad);
  color: #fff;
  border-color: transparent;
  box-shadow: var(--shadow-sm);
}

/* ---------- 搜索 ---------- */
.search-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}
.search-bar input { flex: 1; border-radius: 10px; }
.search-bar select { min-width: 190px; border-radius: 10px; }
.search-bar button { padding: 10px 26px; border-radius: 10px; }

.loading {
  text-align: center;
  padding: 44px;
  color: var(--text-light);
  font-size: 14px;
}
.loading::after {
  content: '';
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-left: 10px;
  vertical-align: middle;
}
.loading.done::after { display: none; animation: none; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 空状态 ---------- */
.empty {
  text-align: center;
  padding: 64px 20px;
  color: var(--text-light);
}
.empty-icon {
  font-size: 52px;
  margin-bottom: 14px;
  display: inline-block;
  width: 96px;
  height: 96px;
  line-height: 96px;
  border-radius: 50%;
  background: var(--primary-soft);
  box-shadow: inset 0 0 0 1px rgba(106,141,255,0.15);
  animation: float 3s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.empty p { font-size: 15px; font-weight: 500; }
.empty .hint { font-size: 13px; margin-top: 6px; font-weight: normal; color: var(--text-faint); }
.chapter-error button { margin-top: 14px; }

/* ---------- 书源列表 ---------- */
.sources-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ---------- 模态框 ---------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 18, 30, 0.55);
  z-index: 200;
  overflow-y: auto;
  padding: 28px 20px;
  animation: fadeIn 0.2s ease both;
}
/* 注意：backdrop-filter 会创建包含块，导致内部 fixed 元素相对弹窗定位而非视口。
   阅读器全屏且内部有 fixed 工具栏，不能加 blur；其他弹窗保留模糊效果。 */
.modal:not(.reader-modal) {
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal-content {
  background: var(--card-bg);
  max-width: 820px;
  margin: 0 auto;
  border-radius: 16px;
  padding: 34px;
  position: relative;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  animation: modalIn 0.24s cubic-bezier(0.34, 1.3, 0.64, 1) both;
}
@keyframes modalIn {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
  to { opacity: 1; transform: none; }
}
.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: transparent;
  color: var(--text-light);
  font-size: 20px;
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 50%;
  box-shadow: none;
}
.modal-close:hover { background: var(--bg); color: var(--text); opacity: 1; }

/* ---------- 书籍详情 ---------- */
.book-detail-cover {
  width: 170px;
  aspect-ratio: 3/4;
  border-radius: 10px;
  background: linear-gradient(150deg, #dbe3f5 0%, #e8e0f5 100%);
  overflow: hidden;
  flex-shrink: 0;
  align-self: flex-start; /* 防止 flex 容器 stretch 拉伸封面高度 */
  box-shadow: var(--shadow-md);
}
[data-theme="dark"] .book-detail-cover {
  background: linear-gradient(150deg, #2a2d3a 0%, #322f45 100%);
}
.book-detail-cover img { width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.book-detail-head {
  display: flex;
  gap: 26px;
  margin-bottom: 22px;
}
.book-detail-info { flex: 1; min-width: 0; }
.book-detail-info h2 {
  margin-bottom: 10px;
  font-size: 24px;
  font-weight: 700;
  line-height: 1.35;
}
.book-detail-info .meta {
  color: var(--text-light);
  font-size: 13px;
  margin: 5px 0;
}
.book-detail-info .meta strong { color: var(--text); font-weight: 600; }
.book-detail-info .intro {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.8;
  white-space: pre-wrap;
  max-height: 210px;
  overflow-y: auto;
  color: var(--text);
  background: var(--bg);
  border-radius: 10px;
  padding: 14px 16px;
  border: 1px solid var(--border);
}
.book-detail-actions { display: flex; gap: 12px; margin-top: 18px; flex-wrap: wrap; }
.book-detail-actions button {
  padding: 11px 26px;
  font-size: 15px;
  border-radius: 10px;
}
.book-detail-actions button.primary { background: var(--primary-grad); }
.book-detail-actions button.secondary {
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}
.book-detail-actions button.secondary:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }

/* ---------- 目录 ---------- */
.toc-list {
  margin-top: 20px;
  max-height: 420px;
  overflow-y: auto;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.toc-item {
  padding: 10px 10px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  border-radius: 8px;
  transition: background var(--transition), color var(--transition), padding-left var(--transition);
}
.toc-item:hover { color: var(--primary); background: var(--primary-soft); padding-left: 14px; }
.toc-item.active { color: var(--primary); font-weight: 600; background: var(--primary-soft); }
/* 倒序/正序目录分隔条 */
.toc-divider {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 14px 0 6px;
  color: var(--text-faint);
  font-size: 12px;
  font-weight: 500;
  user-select: none;
}
.toc-divider::before, .toc-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}
.toc-divider span { white-space: nowrap; }
.toc-current {
  background: var(--bg);
  padding: 8px 12px;
  border-radius: 8px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-light);
}

/* ---------- 阅读器 ---------- */
.reader-modal {
  background: var(--reader-bg, #fff4e0);
  padding: 0;
  border: none;
}
.reader-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 14px 22px;
  padding-top: calc(14px + var(--safe-top));
  background: var(--reader-bg, #fff4e0);
  background: color-mix(in srgb, var(--reader-bg, #fff4e0) 82%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  /* fixed 相对视口置顶（阅读器 modal 无 backdrop-filter，不会创建包含块），
     兼容移动浏览器 fixed 滚动容器内 sticky 失效的问题 */
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
}
.reader-header button:first-child { justify-self: start; }
.reader-header button:last-child { justify-self: end; }
.reader-header button {
  background: transparent;
  color: var(--reader-text, #333);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  box-shadow: none;
}
.reader-header button:hover { background: rgba(0,0,0,0.06); box-shadow: none; }
.reader-header span {
  font-size: 15px;
  font-weight: 600;
  color: var(--reader-text, #333);
  max-width: 60vw;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.reader-body {
  max-width: 760px;
  margin: 0 auto;
  /* 顶部留出 fixed 头部高度（约 62px）与间距 */
  padding: calc(88px + var(--safe-top)) 28px 120px;
  font-size: var(--reader-font-size, 18px);
  line-height: var(--reader-line-height, 1.8);
  color: var(--reader-text, #333);
  white-space: pre-wrap;
  word-break: break-word;
  min-height: calc(100vh - 120px);
  font-family: var(--font);
  letter-spacing: 0.02em;
  /* 纵向滚动保留给浏览器，横向留给滑动切章手势 */
  touch-action: pan-y;
}
/* 正文段落：段首两字缩进 + 段间留白 */
.reader-body p {
  margin: 0 0 0.9em;
  text-indent: 2em;
}
.reader-body p:last-child { margin-bottom: 0; }
.reader-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--card-bg);
  background: color-mix(in srgb, var(--card-bg) 82%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--border);
  padding: 10px 22px;
  padding-bottom: calc(10px + var(--safe-bottom));
  z-index: 10;
}
.reader-footer button {
  background: transparent;
  color: var(--text);
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  box-shadow: none;
}
.reader-footer button:hover { background: var(--primary-soft); color: var(--primary); box-shadow: none; }
.reader-progress {
  font-size: 12px;
  color: var(--text-light);
  white-space: nowrap;
  margin: 0 6px;
  font-variant-numeric: tabular-nums;
}
.reader-settings, .reader-toc {
  position: fixed;
  top: calc(66px + var(--safe-top));
  right: 20px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  max-width: 320px;
  box-shadow: var(--shadow-lg);
  z-index: 300;
  max-height: 70vh;
  overflow-y: auto;
  animation: modalIn 0.2s ease both;
}
.reader-settings h3, .reader-toc h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 14px;
}
.setting-row { margin: 14px 0; }
.setting-row label {
  display: block;
  font-size: 13px;
  margin-bottom: 8px;
  color: var(--text-light);
}
.setting-row input[type=range] { width: 100%; height: 4px; }
.theme-options { display: flex; gap: 8px; }
.theme-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 2px solid var(--border);
  box-shadow: none;
  padding: 0;
  font-size: 11px;
  color: var(--text-light);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
/* 圆钮颜色与对应阅读主题背景一致 */
.theme-btn[data-theme="light"] { background: #ffffff; color: #2b2f36; }
.theme-btn[data-theme="cream"] { background: #f6ecd7; color: #5b4a33; }
.theme-btn[data-theme="green"] { background: #d3ead2; color: #2e4a2e; }
.theme-btn[data-theme="dark"] { background: #17181c; color: #b8bcc8; }
.theme-btn:hover { border-color: var(--primary); transform: scale(1.1); box-shadow: none; }
/* 当前选中主题高亮 */
.theme-btn.active {
  border-color: var(--primary);
  box-shadow: var(--ring);
  transform: scale(1.12);
  font-weight: 700;
}
.reader-toc { width: 300px; }
.reader-toc .toc-item { font-size: 13px; padding: 7px 10px; }

/* 阅读器主题 */
.reader-modal[data-theme="light"] { --reader-bg: #ffffff; --reader-text: #2b2f36; }
.reader-modal[data-theme="cream"] { --reader-bg: #f6ecd7; --reader-text: #5b4a33; }
.reader-modal[data-theme="green"] { --reader-bg: #d3ead2; --reader-text: #2e4a2e; }
.reader-modal[data-theme="dark"] { --reader-bg: #17181c; --reader-text: #b8bcc8; }
.reader-modal[data-theme="dark"] .reader-header { background: rgba(255,255,255,0.04); border-color: rgba(255,255,255,0.08); }
.reader-modal[data-theme="dark"] .reader-header button:hover { background: rgba(255,255,255,0.08); }
.reader-modal[data-theme="dark"] .reader-footer { background: #1e2027; background: color-mix(in srgb, #1e2027 85%, transparent); border-color: #2c2f3a; }
.reader-modal[data-theme="dark"] .reader-footer button { color: #b8bcc8; }
.reader-modal[data-theme="dark"] .reader-footer button:hover { background: rgba(127,160,255,0.15); color: #a7c1ff; }

/* ---------- 分页 ---------- */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 18px;
  margin-top: 28px;
}
.pagination button {
  padding: 7px 18px;
  border-radius: var(--radius-pill);
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}
.pagination button:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.pagination span {
  font-size: 14px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  top: calc(84px + var(--safe-top));
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: rgba(23, 26, 38, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #fff;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 999;
  max-width: 80vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============================================================
   移动端适配（≤768px）
   ============================================================ */
@media (max-width: 768px) {
  /* ---------- 顶部导航（紧凑：仅品牌 + 主题按钮） ---------- */
  /* 不固定定位：移动浏览器地址栏/状态栏会遮挡 fixed/sticky 顶部元素，
     改为跟随文档流后滚动到顶时工具栏完整可见（底部 Tab 已是主导航） */
  .navbar {
    position: static;
    height: calc(56px + var(--safe-top));
    padding: calc(var(--safe-top) + 10px) 22px 8px;
    justify-content: space-between;
  }
  .nav-brand { font-size: 17px; margin-right: 0; }
  .nav-theme button { width: 36px; height: 36px; font-size: 16px; }

  /* ---------- 底部 Tab 导航 ---------- */
  .nav-menu {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 150;
    display: flex;
    gap: 0;
    background: var(--card-bg);
    background: color-mix(in srgb, var(--card-bg) 88%, transparent);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 20px rgba(20,25,40,0.06);
    /* 上下留白对称：底部安全区较大时顶部也同步留白，避免选中项上紧下松 */
    padding: calc(4px + var(--safe-bottom)) 6px calc(4px + var(--safe-bottom));
  }
  .nav-menu li {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 6px 0 5px;
    font-size: 11px;
    border-radius: 12px;
  }
  .nav-menu li .tab-icon { font-size: 20px; line-height: 1.2; }
  .nav-menu li.active {
    background: var(--primary-soft);
    color: var(--primary);
    box-shadow: none;
  }
  .nav-menu li.active .tab-icon { transform: scale(1.08); }
  .nav-menu li:active { opacity: 0.7; }

  /* 页面底部留出 Tab 栏空间 */
  .page { padding: 0 14px; margin: 18px auto 24px; padding-bottom: calc(84px + var(--safe-bottom)); }
  .page-header h2 { font-size: 20px; }

  /* ---------- 书籍网格 ---------- */
  .book-grid { grid-template-columns: repeat(auto-fill, minmax(104px, 1fr)); gap: 12px; }
  .book-info { padding: 8px 9px 10px; }
  .book-name { font-size: 12px; }
  .book-author { font-size: 11px; }
  .book-card { border-radius: 10px; }
  /* 触屏无 hover：书架删除按钮常显 */
  .shelf-remove-btn { opacity: 1; width: 26px; height: 26px; }

  /* ---------- 搜索 ---------- */
  .search-bar { flex-wrap: wrap; gap: 10px; }
  .search-bar select, .search-bar input, .search-bar button { min-width: 100%; }
  .search-bar button { padding: 12px 0; }

  /* ---------- 分类标签（横向滚动） ---------- */
  .category-tags {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 4px;
    scrollbar-width: none;
    margin-bottom: 16px;
  }
  .category-tags::-webkit-scrollbar { display: none; }
  .category-tag { padding: 9px 16px; flex-shrink: 0; }

  /* ---------- 书源页 ---------- */
  .import-url-bar { flex-direction: column; }
  .import-url-bar button { width: 100%; padding: 12px 0; }
  .sources-toolbar { gap: 8px; padding: 12px; }
  .sources-toolbar .toolbar-spacer { display: none; }
  .sources-toolbar button { flex: 1 1 calc(50% - 8px); padding: 10px 8px; font-size: 12px; min-width: 0; }
  .sources-toolbar .checkbox-label, .sources-toolbar .toolbar-info { width: 50%; }
  .source-card { padding: 12px 12px; gap: 10px; }
  .source-card .source-status { font-size: 10px; padding: 3px 8px; }

  /* ---------- 模态框 / 详情 ---------- */
  .modal { padding: 14px 10px; }
  .modal-content { padding: 22px 16px; border-radius: 14px; }
  .book-detail-head { flex-direction: column; gap: 14px; }
  .book-detail-cover { width: 128px; }
  .book-detail-actions button { flex: 1; padding: 12px 10px; }
  .toc-item { padding: 12px 10px; font-size: 14px; }

  /* ---------- 阅读器 ---------- */
  .reader-header { padding: 10px 12px; padding-top: calc(10px + var(--safe-top)); }
  .reader-header button { padding: 8px 12px; font-size: 13px; }
  .reader-header span { max-width: 46vw; font-size: 14px; }
  .reader-body { padding: calc(82px + var(--safe-top)) 18px 140px; }
  .reader-footer { padding: 8px 8px; padding-bottom: calc(8px + var(--safe-bottom)); justify-content: center; gap: 4px; }
  .reader-footer button { padding: 10px 10px; font-size: 13px; flex: 1; min-width: 0; }
  .reader-footer .reader-progress { font-size: 11px; margin: 0 2px; flex-shrink: 0; }
  /* 目录 / 设置：底部抽屉 */
  .reader-settings, .reader-toc {
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: auto;
    max-width: none;
    max-height: 62vh;
    border-radius: 16px 16px 0 0;
    padding: 18px 16px calc(18px + var(--safe-bottom));
    box-shadow: 0 -10px 40px rgba(20,25,40,0.18);
  }
  .setting-row input[type=range] { height: 6px; }
  .theme-btn { width: 40px; height: 40px; font-size: 12px; }

  /* ---------- 分页 / Toast ---------- */
  .pagination { gap: 10px; }
  .pagination button { padding: 8px 16px; }
  .toast { top: calc(64px + var(--safe-top)); max-width: 90vw; }
}

/* ============== 管理员登录（书源管理鉴权） ============== */
.sources-auth {
  padding: 12px 0;
}
.login-card {
  max-width: 340px;
  margin: 8px auto;
  padding: 24px 20px;
  background: var(--card-bg, #fff);
  border: 1px solid var(--border, #e3e6ee);
  border-radius: 12px;
  text-align: center;
  box-shadow: 0 4px 16px rgba(0,0,0,.06);
}
.login-card h3 {
  margin: 0 0 4px;
  font-size: 18px;
}
.login-card .hint {
  margin: 0 0 16px;
  font-size: 13px;
  opacity: .7;
}
.login-card input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  margin-bottom: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border, #d5d9e3);
  border-radius: 8px;
  background: var(--input-bg, #fff);
  color: inherit;
  font-size: 14px;
}
.login-card input:focus {
  outline: none;
  border-color: #4a7cf7;
}
.login-card button {
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 8px;
  background: #4a7cf7;
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}
.login-card button:hover {
  background: #3a6ae0;
}
.login-card button:disabled {
  opacity: .6;
  cursor: not-allowed;
}
.login-msg {
  margin-top: 10px;
  min-height: 18px;
  font-size: 13px;
  color: #e05252;
  word-break: break-all;
}

/* ============== file:// 直接打开提示遮罩 ============== */
.file-hint {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 17, 26, .72);
  backdrop-filter: blur(4px);
  padding: 16px;
}
.file-hint-card {
  max-width: 460px;
  width: 100%;
  background: var(--card-bg, #fff);
  color: var(--text, #1f2430);
  border-radius: 14px;
  padding: 28px 24px;
  text-align: center;
  box-shadow: 0 12px 40px rgba(0,0,0,.3);
}
.file-hint-icon {
  font-size: 40px;
  margin-bottom: 8px;
}
.file-hint-card h3 {
  margin: 0 0 10px;
  font-size: 19px;
}
.file-hint-card p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.7;
  opacity: .85;
}
.file-hint-ways {
  text-align: left;
  margin-bottom: 18px;
}
.file-hint-ways div {
  font-size: 13px;
  line-height: 1.7;
  padding: 10px 12px;
  margin-bottom: 8px;
  background: var(--bg, #f5f6fa);
  border: 1px solid var(--border, #e3e6ee);
  border-radius: 8px;
}
.file-hint-ways code {
  font-size: 12px;
  background: rgba(0,0,0,.06);
  padding: 1px 5px;
  border-radius: 4px;
  word-break: break-all;
}
.file-hint-card button {
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  background: #4a7cf7;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}
.file-hint-card button:hover {
  background: #3a6ae0;
}
/* ============== 导入进度提示 ============== */
.import-progress {
  margin: 8px 0;
  padding: 8px 12px;
  background: #eef3ff;
  border: 1px solid #d5e0fb;
  border-radius: 8px;
  font-size: 13px;
  color: #3a5cc7;
  text-align: center;
  word-break: break-all;
}
/* ============== 书源加载动画 ============== */
.sources-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 48px 0;
  color: var(--text, #1f2430);
  opacity: .8;
}
.sources-loading p {
  margin: 0;
  font-size: 13px;
}
.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid rgba(74, 124, 247, .2);
  border-top-color: #4a7cf7;
  border-radius: 50%;
  animation: spinner-rotate .8s linear infinite;
}
@keyframes spinner-rotate {
  to { transform: rotate(360deg); }
}
/* ============== 禁用状态（导入/导出防重复点击） ============== */
button:disabled {
  opacity: .55;
  cursor: not-allowed;
}