/* ============================================================
   就读书 UI v3 — "温暖图书馆"
   设计方向：温暖知性 · 纸质书质感 · 琥珀焦糖色调 · 沉静优雅
   ============================================================ */

/* ==================== Design Tokens ==================== */
:root {
  /* 主色系 — 暖琥珀/焦糖 */
  --primary: #c17d3b;
  --primary-dark: #9a5f2b;
  --primary-light: #e8b86d;
  --primary-bg: rgba(193, 125, 59, 0.06);
  --primary-glow: rgba(193, 125, 59, 0.15);

  /* 强调色 — 勃艮第红 */
  --accent: #8b4513;
  --accent-dark: #6b3410;
  --accent-light: #c17d3b;
  --accent-bg: #fdf5e6;

  /* 背景 — 纸张色系 */
  --bg: #fdfaf3;
  --bg-alt: #f7f1e3;
  --card: #fffef9;
  --card-hover: #fdf8ef;

  /* 文字 — 深棕 */
  --text: #3d2b1f;
  --text-secondary: #6b5b4f;
  --text-muted: #a08c78;

  /* 边框 */
  --border: #e8dcc8;
  --border-light: #f0e8d5;

  /* 状态色 */
  --success: #5b8c5a;
  --success-bg: #edf5ec;
  --danger: #c0392b;
  --danger-bg: #fdf0ed;
  --warning: #d4a017;
  --warning-bg: #fef9ee;
  --info: #5b7fa5;
  --info-bg: #eef4f9;

  /* 阴影 — 柔和温暖 */
  --shadow-xs: 0 1px 2px rgba(61, 43, 31, 0.03);
  --shadow-sm: 0 1px 3px rgba(61, 43, 31, 0.04), 0 1px 2px rgba(61, 43, 31, 0.02);
  --shadow: 0 4px 12px rgba(61, 43, 31, 0.04), 0 2px 4px rgba(61, 43, 31, 0.02);
  --shadow-md: 0 8px 20px rgba(61, 43, 31, 0.05), 0 4px 8px rgba(61, 43, 31, 0.03);
  --shadow-lg: 0 16px 36px rgba(61, 43, 31, 0.07);
  --shadow-xl: 0 24px 48px rgba(61, 43, 31, 0.1);

  /* 圆角 */
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius: 14px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 动画 */
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* 字体 */
  --font-serif: 'Noto Serif SC', 'STSong', 'SimSun', 'Songti SC', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse at 20% 0%, rgba(232, 184, 109, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 100%, rgba(193, 125, 59, 0.04) 0%, transparent 60%);
  min-height: 100vh;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--primary-dark);
}

img {
  max-width: 100%;
  height: auto;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* ==================== App Container ==================== */
.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ==================== Header ==================== */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 8px;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(253, 250, 243, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
}
.logo:hover {
  color: var(--primary);
}
.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.2);
}

.logo-version {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--primary);
  background: var(--accent-bg);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
  letter-spacing: 0;
  margin-left: 4px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 8px 14px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition);
  font-weight: 500;
}
.btn-icon:hover {
  color: var(--primary);
  background: var(--primary-bg);
}

/* ==================== Hero ==================== */
.hero {
  text-align: center;
  padding: 64px 20px 48px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(232, 184, 109, 0.1) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-tagline {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
  margin-bottom: 12px;
  position: relative;
  letter-spacing: 0.03em;
}
.hero-tagline .highlight {
  color: var(--primary);
  position: relative;
}
.hero-tagline .highlight::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  right: 0;
  height: 6px;
  background: rgba(232, 184, 109, 0.3);
  border-radius: 3px;
  z-index: -1;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  letter-spacing: 0.04em;
}

.hero-features {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 8px;
}

.hero-feat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
}
.hero-feat:hover {
  border-color: var(--primary-light);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.feat-icon {
  font-size: 1.1rem;
}

/* ==================== Search ==================== */
.search-section {
  padding: 0 0 48px;
}

.search-wrapper {
  position: relative;
  max-width: 640px;
  margin: 0 auto 32px;
}

.search-input {
  width: 100%;
  padding: 16px 56px 16px 24px;
  font-size: 1.05rem;
  background: var(--card);
  border: 2px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text);
  outline: none;
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
}
.search-input::placeholder {
  color: var(--text-muted);
}
.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-bg), var(--shadow-sm);
}

.search-btn {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition);
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.25);
}
.search-btn:hover {
  box-shadow: 0 4px 16px rgba(193, 125, 59, 0.35);
  transform: translateY(-50%) scale(1.02);
}
.search-btn-icon {
  font-size: 1rem;
}

.suggestions {
  position: absolute;
  top: calc(100% + 8px);
  left: 12px;
  right: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  max-height: 280px;
  overflow-y: auto;
  z-index: 50;
  display: none;
}
.suggestions.active {
  display: block;
}
.suggestion-item {
  padding: 12px 20px;
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  border-bottom: 1px solid var(--border-light);
}
.suggestion-item:last-child {
  border-bottom: none;
}

/* ==================== Search History Dropdown ==================== */
.search-history-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 12px;
  right: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 50;
  display: none;
  overflow: hidden;
}
.search-history-dropdown.active {
  display: block;
}

.shd-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-alt);
}

.shd-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.shd-clear {
  font-size: 0.75rem;
  color: var(--danger);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  transition: all var(--transition);
  font-weight: 500;
}
.shd-clear:hover {
  background: var(--danger-bg);
}

.shd-list {
  max-height: 260px;
  overflow-y: auto;
}

.shd-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
  cursor: pointer;
  transition: background var(--transition);
  border-bottom: 1px solid var(--border-light);
}
.shd-item:last-child {
  border-bottom: none;
}
.shd-item:hover {
  background: var(--primary-bg);
}

.shd-item-keyword {
  font-size: 0.9rem;
  color: var(--text);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.shd-item-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  margin-left: 12px;
}

.shd-item-time {
  font-size: 0.72rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.shd-item-del {
  font-size: 1rem;
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 4px;
  transition: all var(--transition);
  line-height: 1;
}
.shd-item-del:hover {
  color: var(--danger);
  background: var(--danger-bg);
}

.shd-empty {
  text-align: center;
  padding: 32px 20px;
  color: var(--text-muted);
  font-size: 0.88rem;
  display: none;
}
.shd-empty.show {
  display: block;
}
/* ==================== End Search History ==================== */

.suggestion-item:hover {
  background: var(--primary-bg);
  color: var(--primary);
}

/* ==================== Books Grid ==================== */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

@media (max-width: 767px) {
  .books-table-wrap {
    display: none;
  }
}

@media (min-width: 768px) {
  .books-grid {
    display: none;
  }
  .books-table-wrap {
    display: block;
  }
}

.book-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.book-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.book-card-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--primary);
  font-weight: 600;
}

.book-card-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.book-card-meta span {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.meta-icon {
  color: var(--primary-light);
}

.book-card-chapter {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
  gap: 12px;
}

.book-card-source {
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 60%;
}

.book-card-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-full);
  transition: all var(--transition);
  box-shadow: 0 2px 6px rgba(193, 125, 59, 0.2);
  white-space: nowrap;
}
.btn-download:hover {
  box-shadow: 0 4px 12px rgba(193, 125, 59, 0.3);
  transform: translateY(-1px);
}

.btn-download-sm {
  padding: 6px 14px;
  font-size: 0.78rem;
}

/* ==================== Books Table ==================== */
.books-table-wrap {
  overflow-x: auto;
}

.books-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}

.books-table th {
  padding: 14px 16px;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}

.books-table td {
  padding: 14px 16px;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-light);
  vertical-align: middle;
}

.books-table tr:hover td {
  background: var(--card-hover);
}

.book-table-name {
  font-weight: 600;
  color: var(--text);
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.book-table-source {
  color: var(--text-muted);
  font-size: 0.82rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 120px;
  display: inline-block;
}

.book-table-time {
  white-space: nowrap;
  color: var(--text-muted);
  font-size: 0.82rem;
}


/* ==================== Nav Tabs ==================== */
.nav-tabs {
  display: flex;
  gap: 4px;
  padding: 8px;
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  margin-bottom: 32px;
  box-shadow: var(--shadow-xs);
}

.nav-tab {
  flex: 1;
  padding: 10px 20px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition);
  white-space: nowrap;
}
.nav-tab:hover {
  color: var(--primary);
  background: var(--primary-bg);
}
.nav-tab.active {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.25);
}

/* ==================== Section ==================== */
.section {
  padding: 8px 0 48px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
}

/* ==================== Tutorial ==================== */
.tutorial-hero {
  text-align: center;
  padding: 40px 20px 32px;
  background: linear-gradient(135deg, var(--card-hover), var(--accent-bg));
  border-radius: var(--radius);
  margin-bottom: 32px;
  border: 1px solid var(--border-light);
}

.tutorial-hero-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.tutorial-hero-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.tutorial-hero-sub {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.tutorial-quick-cards {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.quick-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px 24px;
  background: var(--card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
  min-width: 80px;
}

.quick-card-icon {
  font-size: 1.4rem;
}

.quick-card-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.quick-card-arrow {
  font-size: 1.2rem;
  color: var(--text-muted);
}

.tutorial-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.tutorial-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 24px;
  position: relative;
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
}
.tutorial-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.tutorial-card-badge {
  position: absolute;
  top: -12px;
  left: 20px;
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.25);
}

.tutorial-card-icon {
  font-size: 1.8rem;
  margin-bottom: 12px;
  margin-top: 4px;
}

.tutorial-card-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.tutorial-card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 10px;
}

.tutorial-card-tip {
  font-size: 0.78rem;
  color: var(--primary);
  background: var(--accent-bg);
  padding: 6px 12px;
  border-radius: var(--radius-xs);
  display: inline-block;
}

.tutorial-card-note {
  font-size: 0.82rem;
  color: var(--warning);
  background: var(--warning-bg);
  padding: 8px 14px;
  border-radius: var(--radius-xs);
  border-left: 3px solid var(--warning);
}

.tutorial-format-list {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.format-badge {
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-xs);
}
.format-badge.epub { background: #e8f5e9; color: #2e7d32; }
.format-badge.txt  { background: #e3f2fd; color: #1565c0; }
.format-badge.html { background: #fff3e0; color: #e65100; }
.format-badge.pdf  { background: #fce4ec; color: #c62828; }

/* ==================== Guestbook ==================== */
.gb-hero {
  text-align: center;
  padding: 40px 20px 32px;
  background: linear-gradient(135deg, var(--card-hover), var(--accent-bg));
  border-radius: var(--radius);
  margin-bottom: 24px;
  border: 1px solid var(--border-light);
}

.gb-hero-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.gb-hero-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.gb-hero-sub {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.gb-hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}

.gb-hero-count {
  font-size: 0.9rem;
  color: var(--text-secondary);
  background: var(--card);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
}

.btn-gb-refresh {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 6px 16px;
  font-size: 0.85rem;
  color: var(--primary);
  background: var(--primary-bg);
  border-radius: var(--radius-full);
  transition: all var(--transition);
  font-weight: 500;
}
.btn-gb-refresh:hover {
  background: var(--primary);
  color: #fff;
}

/* Guestbook Form Card */
.gb-form-card {
  display: flex;
  gap: 16px;
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-xs);
  transition: all var(--transition);
}
.gb-form-card:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-bg), var(--shadow-sm);
}

.gb-form-avatar {
  font-size: 1.8rem;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-bg);
  border-radius: 50%;
}

.gb-form-body {
  flex: 1;
  min-width: 0;
}

.gb-form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}

.gb-form-nick,
.gb-form-email {
  flex: 1;
  padding: 10px 14px;
  font-size: 0.88rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: all var(--transition);
}
.gb-form-nick:focus,
.gb-form-email:focus {
  border-color: var(--primary-light);
  background: var(--card);
}

.gb-form-textarea {
  width: 100%;
  padding: 12px 14px;
  font-size: 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  background: var(--bg);
  color: var(--text);
  outline: none;
  resize: vertical;
  min-height: 80px;
  transition: all var(--transition);
  line-height: 1.6;
}
.gb-form-textarea:focus {
  border-color: var(--primary-light);
  background: var(--card);
}

.gb-form-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 12px;
}

.gb-form-hint {
  display: flex;
  align-items: center;
  gap: 8px;
}

.gb-char-count {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.gb-form-actions-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.guestbook-cooldown {
  font-size: 0.8rem;
  color: var(--text-muted);
}
.guestbook-cooldown.hidden {
  display: none;
}

.btn-submit-guestbook {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-full);
  transition: all var(--transition);
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.2);
}
.btn-submit-guestbook:hover {
  box-shadow: 0 4px 14px rgba(193, 125, 59, 0.3);
  transform: translateY(-1px);
}

/* Guestbook List */
.guestbook-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* 主留言卡片（兼容 .gb-card 与 .guestbook-card） */
.gb-card,
.guestbook-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px 24px;
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
}
.gb-card:hover,
.guestbook-card:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.gb-card-header,
.guestbook-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.gb-card-user,
.guestbook-card-left {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.guestbook-card-nickname,
.guestbook-card-city,
.guestbook-card-time {
  font-size: 0.9rem;
}

.gb-card-nick,
.guestbook-card-nickname {
  font-weight: 600;
  color: var(--text);
}

.guestbook-card-city {
  color: var(--text-muted);
}

.guestbook-card-floor {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--primary);
  background: var(--accent-bg);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.gb-card-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
}

.gb-card-badge,
.guestbook-admin-badge {
  font-size: 0.68rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
}
.gb-card-badge.admin,
.guestbook-admin-badge {
  background: var(--accent-bg);
  color: var(--accent);
}

.gb-card-meta,
.guestbook-card-time {
  display: flex;
  gap: 12px;
  font-size: 0.76rem;
  color: var(--text-muted);
}

.gb-card-content,
.guestbook-card-content {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 12px;
  word-break: break-word;
}

.guestbook-card-device {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 12px;
}

.gb-card-actions,
.guestbook-reply-actions {
  display: flex;
  gap: 12px;
}

.btn-reply-toggle,
.btn-gb-reply {
  font-size: 0.82rem;
  color: var(--primary);
  font-weight: 500;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 0;
}
.btn-reply-toggle:hover,
.btn-gb-reply:hover {
  color: var(--primary-dark);
}
.btn-gb-reply.active {
  color: var(--accent);
}

/* Replies */
.gb-replies,
.guestbook-replies-inline {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.guestbook-replies-empty {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 8px 0;
}

.gb-reply-item,
.guestbook-reply-item {
  padding: 10px 14px;
  background: var(--bg);
  border-radius: var(--radius-xs);
  border-left: 3px solid var(--primary-light);
}
.guestbook-reply-item.admin {
  border-left-color: var(--accent);
  background: var(--accent-bg);
}

.gb-reply-header,
.guestbook-reply-item-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
  flex-wrap: wrap;
}

.gb-reply-nick,
.guestbook-reply-item-nickname {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
}

.gb-reply-meta,
.guestbook-reply-item-time {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.guestbook-reply-item-content,
.gb-reply-content {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Reply Form */
.gb-reply-form,
.guestbook-reply-form {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: replyFormIn 0.3s ease;
}
.guestbook-reply-form.hidden {
  display: none;
}

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

.gb-reply-form-row {
  display: flex;
  gap: 10px;
}

.gb-reply-nickname,
.gb-reply-email,
.gb-reply-textarea,
.guestbook-reply-form .gb-reply-content,
.guestbook-reply-form textarea.gb-reply-content {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: all var(--transition);
}
.gb-reply-nickname:focus,
.gb-reply-email:focus,
.gb-reply-textarea:focus,
.guestbook-reply-form .gb-reply-content:focus {
  border-color: var(--primary-light);
  background: var(--card);
}

.gb-reply-textarea,
.guestbook-reply-form .gb-reply-content,
.guestbook-reply-form textarea.gb-reply-content {
  resize: vertical;
  min-height: 60px;
  line-height: 1.6;
}

.gb-reply-actions,
.guestbook-reply-form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
}

.btn-reply-cancel,
.btn-gb-reply-cancel {
  padding: 6px 16px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition);
}
.btn-reply-cancel:hover,
.btn-gb-reply-cancel:hover {
  background: var(--bg-alt);
}

.btn-reply-submit,
.btn-gb-reply-submit {
  padding: 6px 20px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-full);
  transition: all var(--transition);
}
.btn-reply-submit:hover,
.btn-gb-reply-submit:hover {
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.25);
}

.guestbook-reply-error {
  font-size: 0.82rem;
  color: var(--danger);
  background: var(--danger-bg);
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  border-left: 3px solid var(--danger);
  display: none;
}
.guestbook-reply-error.show {
  display: block;
  animation: replyFormIn 0.25s ease;
}


/* Guestbook Empty */
.guestbook-empty {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}

.guestbook-empty-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

/* Guestbook Skeleton */
.guestbook-skeleton {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.gb-sk-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px 24px;
  animation: gbSkPulse 1.5s ease-in-out infinite;
}

@keyframes gbSkPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.gb-sk-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.gb-sk-line {
  height: 14px;
  background: var(--border-light);
  border-radius: 4px;
  margin-bottom: 10px;
}
.gb-sk-line:last-child { margin-bottom: 0; }
.gb-sk-line.w20 { width: 20%; }
.gb-sk-line.w30 { width: 30%; }
.gb-sk-line.w40 { width: 40%; }
.gb-sk-line.w60 { width: 60%; }
.gb-sk-line.w80 { width: 80%; }
.gb-sk-line.w100 { width: 100%; }

/* Guestbook Fold */\n.gb-fold-hidden {\n  display: none;\n}\n\n.gb-fold-bar {\n  text-align: center;\n  padding: 16px 0 8px;\n  position: relative;\n}\n\n.gb-fold-bar::before {\n  content: '';\n  position: absolute;\n  left: 0;\n  right: 0;\n  top: 50%;\n  height: 1px;\n  background: var(--border-light);\n}\n\n.btn-gb-fold {\n  position: relative;\n  display: inline-flex;\n  align-items: center;\n  gap: 6px;\n  padding: 8px 24px;\n  font-size: 0.85rem;\n  font-weight: 500;\n  color: var(--primary);\n  background: var(--card);\n  border: 1px solid var(--primary-light);\n  border-radius: var(--radius-full);\n  cursor: pointer;\n  transition: all var(--transition);\n  white-space: nowrap;\n}\n\n.btn-gb-fold:hover {\n  background: var(--primary-bg);\n  border-color: var(--primary);\n  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.15);\n}\n\n.gb-fold-icon {\n  font-size: 1rem;\n}\n\n/* Guestbook Pagination */
.guestbook-pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}

.btn-page {
  padding: 8px 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  transition: all var(--transition);
}
.btn-page:hover:not(:disabled) {
  border-color: var(--primary);
  color: var(--primary);
}
.btn-page:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.page-info {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==================== Disclaimer ==================== */
.disclaimer {
  margin-bottom: 32px;
}

.disclaimer-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
}
.disclaimer-toggle:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.disclaimer-toggle-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.disclaimer-toggle-icon {
  font-size: 1.1rem;
}

.disclaimer-toggle-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.disclaimer-toggle-arrow {
  font-size: 1.3rem;
  color: var(--text-muted);
  transition: transform var(--transition);
}
.disclaimer-toggle[aria-expanded="true"] .disclaimer-toggle-arrow {
  transform: rotate(90deg);
}

.disclaimer-body {
  display: none;
  padding: 20px 24px;
  background: var(--card);
  border: 1px solid var(--border-light);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}
.disclaimer-body.open {
  display: block;
}

.disclaimer-intro {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.7;
}

.disclaimer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.disclaimer-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.disclaimer-item-icon {
  flex-shrink: 0;
  font-size: 0.9rem;
}

.disclaimer-footer-text {
  font-size: 0.82rem;
  color: var(--primary);
  font-weight: 600;
  text-align: center;
}

/* ==================== Downloaded Books ==================== */
.files-search-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.files-search-input {
  padding: 8px 16px;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  background: var(--card);
  color: var(--text);
  outline: none;
  min-width: 200px;
  transition: all var(--transition);
}
.files-search-input:focus {
  border-color: var(--primary-light);
}

.cleanup-notice {
  display: none;
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: var(--warning-bg);
  padding: 10px 16px;
  border-radius: var(--radius-xs);
  margin-bottom: 16px;
  border-left: 3px solid var(--warning);
}
.cleanup-notice.visible {
  display: block;
}

.file-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  margin-bottom: 12px;
  box-shadow: var(--shadow-xs);
  transition: all var(--transition);
}
.file-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}

.file-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.2);
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
  word-break: break-all;
  line-height: 1.4;
}

.file-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.file-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .file-card {
    flex-wrap: wrap;
    gap: 12px;
  }
  .file-info {
    width: calc(100% - 60px);
  }
  .file-actions {
    width: 100%;
    justify-content: flex-end;
  }
}

/* ==================== Empty State ==================== */
.empty-state {
  text-align: center;
  padding: 64px 20px;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.empty-text {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* ==================== Pagination ==================== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.pagination-info,
.files-pagination-info {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-right: 8px;
}

.page-btn,
.files-page-btn {
  min-width: 36px;
  height: 36px;
  padding: 6px 10px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  transition: all var(--transition);
  text-align: center;
}
.page-btn:hover:not(:disabled),
.files-page-btn:hover:not(:disabled) {
  border-color: var(--primary);
  color: var(--primary);
}
.page-btn:disabled,
.files-page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.page-btn.active,
.files-page-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.page-ellipsis {
  padding: 0 6px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ==================== Footer ==================== */
.footer {
  margin-top: 48px;
  padding-bottom: 32px;
}

.footer-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border), transparent);
  margin-bottom: 32px;
}

.footer-main {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 24px;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.footer-brand-icon {
  font-size: 1.2rem;
}

.footer-brand-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 280px;
}

.footer-col-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.footer-col-link {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 4px 0;
  transition: color var(--transition);
}
.footer-col-link:hover {
  color: var(--primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-muted);
  padding: 16px 0;
  border-top: 1px solid var(--border-light);
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.footer-bottom-divider {
  color: var(--border);
}

.footer-copyright {
  text-align: center;
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.footer-beian-row {
  text-align: center;
  font-size: 0.76rem;
}
.footer-beian-row a {
  color: var(--text-muted);
}
.footer-beian-row a:hover {
  color: var(--primary);
}

/* ==================== Toast ==================== */
.gb-toast-container {
  position: fixed;
  top: 80px;
  right: 20px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.gb-toast {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
  max-width: 360px;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(40px); }
}

.gb-toast.success {
  background: var(--success);
  color: #fff;
}
.gb-toast.error {
  background: var(--danger);
  color: #fff;
}
.gb-toast.info {
  background: var(--info);
  color: #fff;
}

/* ==================== Buttons & Utilities ==================== */
.btn-sm {
  padding: 6px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition);
  color: var(--primary);
  background: var(--primary-bg);
}
.btn-sm:hover {
  background: var(--primary);
  color: #fff;
}
.btn-sm.danger {
  color: var(--danger);
  background: var(--danger-bg);
}
.btn-sm.danger:hover {
  background: var(--danger);
  color: #fff;
}

.btn-retry {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-bg);
  border-radius: var(--radius-full);
  transition: all var(--transition);
  margin-top: 8px;
}
.btn-retry:hover {
  background: var(--primary);
  color: #fff;
}

.hidden {
  display: none !important;
}

kbd {
  display: inline-block;
  padding: 2px 8px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
}

/* ==================== Modal & Drawer ==================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(61, 43, 31, 0.3);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
}
.modal-overlay.open {
  display: flex;
}

.modal {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  max-width: 420px;
  width: 90%;
  box-shadow: var(--shadow-xl);
}

.modal-spinner {
  position: relative;
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
}

.ring {
  width: 56px;
  height: 56px;
  border: 3px solid var(--border-light);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.ring-inner {
  position: absolute;
  inset: 8px;
  border: 3px solid var(--border-light);
  border-bottom-color: var(--primary-light);
  border-radius: 50%;
  animation: spin 1.2s linear infinite reverse;
}

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

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.modal-text {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.progress-bar-wrap {
  margin-top: 20px;
  height: 6px;
  background: var(--border-light);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
}

.progress-text {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* Drawer */
.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(61, 43, 31, 0.2);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-slow);
}
.drawer-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 380px;
  max-width: 90vw;
  background: var(--card);
  box-shadow: var(--shadow-xl);
  z-index: 201;
  padding: 24px;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
}
.drawer.open {
  transform: translateX(0);
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}

.drawer-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
}

.drawer-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--text-muted);
  border-radius: 50%;
  transition: all var(--transition);
}
.drawer-close:hover {
  background: var(--bg-alt);
  color: var(--text);
}

.setting-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.setting-group {
  margin-bottom: 20px;
}

.setting-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

.setting-select,
.setting-input {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.88rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: all var(--transition);
}
.setting-select:focus,
.setting-input:focus {
  border-color: var(--primary-light);
}

.drawer-footer {
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

.btn-sources {
  width: 100%;
  padding: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-bg);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.btn-sources:hover {
  background: var(--primary);
  color: #fff;
}

/* ==================== Format Dropdown ==================== */
.format-dropdown {
  position: absolute;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  z-index: 150;
  display: none;
  min-width: 140px;
  overflow: hidden;
}
.format-dropdown.show {
  display: block;
}

.format-item {
  display: block;
  width: 100%;
  padding: 12px 20px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  text-align: left;
  transition: all var(--transition);
  border-bottom: 1px solid var(--border-light);
  cursor: pointer;
}
.format-item:last-child {
  border-bottom: none;
}
.format-item:hover {
  background: var(--primary-bg);
  color: var(--primary);
}
.format-item.default {
  color: var(--primary);
  font-weight: 600;
}

/* ==================== Ad Float ==================== */
.ad-unit.ad-float {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 90;
}

.ad-close-btn {
  position: absolute;
  top: -10px;
  right: -10px;
  width: 24px;
  height: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 50%;
  font-size: 0.7rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
}
.ad-close-btn:hover {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.ad-content {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px;
  min-width: 200px;
  box-shadow: var(--shadow-md);
  text-align: center;
}

/* ==================== About Page ==================== */
.about-hero {
  text-align: center;
  padding: 48px 20px 40px;
  background: linear-gradient(135deg, var(--card-hover), var(--accent-bg));
  border-radius: var(--radius);
  margin: 24px 0 32px;
  border: 1px solid var(--border-light);
}

.about-hero-icon {
  font-size: 2.8rem;
  margin-bottom: 12px;
}

.about-hero h1 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}

.about-domain {
  font-size: 0.95rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.about-hero p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

.about-section {
  margin-bottom: 32px;
}

.about-section-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.about-section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-light);
  margin-top: 2px;
}

.about-section p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 12px;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.about-feature-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 24px 20px;
  text-align: center;
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
}
.about-feature-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.about-feature-icon {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.about-feature-card h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.about-feature-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.about-tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.about-tech-card {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
}
.about-tech-card:hover {
  border-color: var(--accent-light);
  box-shadow: var(--shadow-sm);
}

.about-tech-card h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tech-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.76rem;
  border-radius: 20px;
  background: var(--accent-bg);
  color: var(--accent);
  font-weight: 500;
}
.tech-tag.blue {
  background: rgba(91, 127, 165, 0.08);
  color: var(--info);
}

.about-contact {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 24px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  box-shadow: var(--shadow-xs);
}

.about-contact-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.about-contact-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
}

.about-contact-info p {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin: 0;
}

.about-contact-info a {
  color: var(--primary);
  font-weight: 500;
}
.about-contact-info a:hover {
  color: var(--primary-dark);
}

.about-contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition);
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.25);
}
.about-contact-btn:hover {
  box-shadow: 0 4px 14px rgba(193, 125, 59, 0.35);
  transform: translateY(-1px);
  color: #fff;
}

.about-disclaimer {
  background: var(--accent-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 24px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.about-disclaimer-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  margin-top: 1px;
}

.about-disclaimer p {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* ==================== Changelog Page ==================== */
.changelog-hero {
  text-align: center;
  padding: 48px 20px 40px;
  margin: 24px 0 32px;
}

.changelog-hero h1 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.changelog-hero p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.changelog-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.changelog-stat {
  text-align: center;
}

.changelog-stat-num {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}

.changelog-stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.timeline {
  position: relative;
  padding-left: 32px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--border);
}

.timeline-year {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary);
  margin: 32px 0 16px;
  position: relative;
}
.timeline-year::before {
  content: '';
  position: absolute;
  left: -28px;
  top: 50%;
  transform: translateY(-50%);
  width: 10px;
  height: 10px;
  background: var(--primary);
  border-radius: 50%;
  border: 2px solid var(--card);
}

.timeline-item {
  margin-bottom: 20px;
  padding: 16px 20px;
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  position: relative;
  box-shadow: var(--shadow-xs);
  transition: all var(--transition);
}
.timeline-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--border);
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -26px;
  top: 22px;
  width: 6px;
  height: 6px;
  background: var(--primary-light);
  border-radius: 50%;
}

.timeline-version {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}

.timeline-date {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.timeline-changes {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.timeline-changes li {
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
  line-height: 1.6;
}
.timeline-changes li::before {
  content: '·';
  position: absolute;
  left: 4px;
  color: var(--primary);
  font-weight: 700;
}

/* ==================== Friends Page ==================== */
.friends-hero {
  text-align: center;
  padding: 48px 20px 40px;
  margin: 24px 0 32px;
}

.friends-hero h1 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.friends-hero p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.friends-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 40px;
}

.friend-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  box-shadow: var(--shadow-xs);
  color: var(--text);
}
.friend-card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--text);
}

.friend-card-avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
}

.friend-card-name {
  font-weight: 700;
  font-size: 0.95rem;
}

.friend-card-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.friends-empty {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.friends-rules {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-xs);
}

.friends-rules h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 16px;
}

.rule-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rule-list li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  padding-left: 20px;
  position: relative;
  line-height: 1.6;
}
.rule-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
}

.rule-template {
  background: var(--bg-alt);
  padding: 16px 20px;
  border-radius: var(--radius-xs);
  margin: 16px 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.rule-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 12px 0;
}

.btn-mail {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 24px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.25);
}
.btn-mail:hover {
  box-shadow: 0 4px 14px rgba(193, 125, 59, 0.35);
  transform: translateY(-1px);
  color: #fff;
}

.mail-hint {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-left: 12px;
}

/* ==================== Policy Pages (Privacy / Terms) ==================== */
.policy-hero {
  text-align: center;
  padding: 48px 20px 40px;
  margin: 24px 0 32px;
}

.policy-hero h1 {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.policy-hero p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.policy-intro {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
  padding: 16px 20px;
  background: var(--accent-bg);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}

.policy-section {
  margin-bottom: 28px;
}

.policy-section h2 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
}

.policy-section p,
.policy-section li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 8px;
}

.policy-section ul,
.policy-section ol {
  padding-left: 24px;
  margin-bottom: 12px;
}

.policy-section strong {
  color: var(--text);
}

.policy-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.85rem;
}

.policy-table th,
.policy-table td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
}

.policy-table th {
  background: var(--accent-bg);
  font-weight: 600;
  color: var(--text);
}

.policy-table td {
  color: var(--text-secondary);
}

.policy-contact {
  background: var(--card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin-top: 24px;
  box-shadow: var(--shadow-xs);
}

.policy-contact p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.policy-contact strong {
  color: var(--text);
}

/* ==================== Bookmark Dialog ==================== */
.bookmark-overlay {
  position: fixed;
  inset: 0;
  background: rgba(61, 43, 31, 0.3);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 300;
}
.bookmark-overlay.open {
  display: flex;
}

.bookmark-dialog {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
  max-width: 400px;
  width: 90%;
  box-shadow: var(--shadow-xl);
}

.bookmark-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.bookmark-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.bookmark-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.bookmark-shortcut {
  display: inline-block;
  padding: 2px 10px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--primary);
}

.bookmark-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.btn-bookmark {
  padding: 10px 24px;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition);
}

.btn-bookmark-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.25);
}
.btn-bookmark-primary:hover {
  box-shadow: 0 4px 14px rgba(193, 125, 59, 0.35);
  transform: translateY(-1px);
}

.btn-bookmark-secondary {
  color: var(--text-secondary);
  background: var(--bg-alt);
}
.btn-bookmark-secondary:hover {
  background: var(--border-light);
}

/* ==================== Share Dialog ==================== */
.share-overlay {
  position: fixed;
  inset: 0;
  background: rgba(61, 43, 31, 0.3);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 300;
}
.share-overlay.open {
  display: flex;
}

.share-dialog {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
  max-width: 400px;
  width: 90%;
  box-shadow: var(--shadow-xl);
}

.share-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.share-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.share-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 20px;
}

.btn-share-close {
  padding: 10px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-full);
  transition: all var(--transition);
}
.btn-share-close:hover {
  box-shadow: 0 4px 14px rgba(193, 125, 59, 0.35);
  transform: translateY(-1px);
}

/* ==================== Disclaimer Dialog ==================== */
.disclaimer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(61, 43, 31, 0.3);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 300;
}
.disclaimer-overlay.open {
  display: flex;
}

.disclaimer-dialog {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 480px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  max-height: 85vh;
  overflow-y: auto;
}

.disclaimer-dialog-icon {
  text-align: center;
  margin-bottom: 16px;
}

.disclaimer-dialog-icon-circle {
  width: 52px;
  height: 52px;
  background: var(--warning-bg);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.disclaimer-dialog-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  text-align: center;
  margin-bottom: 8px;
}

.disclaimer-dialog-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 20px;
}

.disclaimer-dialog-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.disclaimer-dialog-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.disclaimer-dialog-dot {
  width: 6px;
  height: 6px;
  background: var(--primary);
  border-radius: 50%;
  margin-top: 8px;
  flex-shrink: 0;
}

.disclaimer-dialog-divider {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 12px 0;
  border-top: 1px solid var(--border-light);
  margin-bottom: 16px;
}

.disclaimer-dialog-footer {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.btn-disclaimer {
  padding: 10px 20px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition);
}

.btn-disclaimer-cancel {
  color: var(--text-secondary);
  background: var(--bg-alt);
}
.btn-disclaimer-cancel:hover {
  background: var(--border-light);
}

.btn-disclaimer-confirm {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  box-shadow: 0 2px 8px rgba(193, 125, 59, 0.25);
}
.btn-disclaimer-confirm:hover {
  box-shadow: 0 4px 14px rgba(193, 125, 59, 0.35);
  transform: translateY(-1px);
}

/* ==================== Sources Modal ==================== */
.sources-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.source-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-light);
  font-size: 0.85rem;
}

.source-name {
  font-weight: 600;
  color: var(--text);
}

.source-url {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
  word-break: break-all;
}

.source-status {
  font-size: 0.78rem;
}
.source-status.online,
.source-status.enabled {
  color: var(--success);
}
.source-status.offline,
.source-status.disabled {
  color: var(--danger);
}

.btn-test {
  padding: 6px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--primary-bg);
  border-radius: var(--radius-full);
  transition: all var(--transition);
}
.btn-test:hover {
  background: var(--primary);
  color: #fff;
}

/* ==================== Search History ==================== */
.history-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.history-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-radius: var(--radius-xs);
  transition: all var(--transition);
  cursor: pointer;
}
.history-item:hover {
  background: var(--primary-bg);
}

.history-keyword {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.history-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

.history-count {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.history-remove {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
  transition: all var(--transition);
}
.history-remove:hover {
  color: var(--danger);
  background: var(--danger-bg);
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
  .hero {
    padding: 40px 16px 32px;
  }
  .hero-tagline {
    font-size: 1.5rem;
  }
  .hero-sub {
    font-size: 0.9rem;
  }
  .hero-features {
    gap: 8px;
  }
  .hero-feat {
    padding: 8px 14px;
    font-size: 0.8rem;
  }

  .search-input {
    padding: 14px 48px 14px 18px;
    font-size: 0.95rem;
  }
  .search-btn {
    padding: 8px 18px;
    font-size: 0.82rem;
  }
  .search-btn span {
    display: none;
  }

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

  .nav-tabs {
    flex-wrap: wrap;
  }
  .nav-tab {
    padding: 8px 14px;
    font-size: 0.82rem;
  }

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

  .tutorial-quick-cards {
    gap: 6px;
  }
  .quick-card {
    padding: 12px 16px;
    min-width: 60px;
  }
  .quick-card-arrow {
    font-size: 1rem;
  }

  .gb-form-row {
    flex-direction: column;
  }

  .gb-form-card {
    padding: 16px;
  }

  .gb-card {
    padding: 16px;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .about-features {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-tech-grid {
    grid-template-columns: 1fr;
  }
  .about-contact {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .friends-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .drawer {
    width: 100%;
    max-width: 100vw;
  }
}

@media (max-width: 480px) {
  .hero-tagline {
    font-size: 1.3rem;
  }
  .about-features {
    grid-template-columns: 1fr;
  }
  .friends-grid {
    grid-template-columns: 1fr;
  }
  .changelog-stats {
    gap: 16px;
  }
  .header {
    padding: 12px 0;
  }
  .logo {
    font-size: 1.15rem;
  }
  .btn-icon {
    padding: 6px 10px;
    font-size: 0.78rem;
  }
}