/* ========================================
   涿鹿方言数字博物馆 — 全局样式
   ======================================== */

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

:root {
  --bg: #fafafa;
  --bg2: #ffffff;
  --bg3: #f3f4f6;
  --bg4: #e5e7eb;
  --text: #1a1a1a;
  --text2: #4b5563;
  --text3: #9ca3af;
  --accent: #10b981;
  --accent2: #059669;
  --accent-soft: rgba(16,185,129,.08);
  --border: #e5e7eb;
  --border2: #d1d5db;
  --shadow: rgba(0,0,0,.06);
  --nav-bg: rgba(250,250,250,.85);
  /* 古朴暖色（学术档案区域） */
  --warm: #d97706;
  --warm-soft: rgba(217,119,6,.12);
  --warm-bg: #fffbf5;
  --warm-border: #f5e6d3;
  /* 音调色彩 */
  --tone1: #3b82f6;
  --tone1-bg: #dbeafe;
  --tone2: #22c55e;
  --tone2-bg: #dcfce7;
  --tone3: #ca8a04;
  --tone3-bg: #fef9c3;
  --tone4: #ef4444;
  --tone4-bg: #fee2e2;
  --rusheng: #8b5cf6;
  --rusheng-bg: #f3e8ff;
  --long-color: #6b7280;
  --erhua: #f97316;
  --highlight: #fef08a;
}

/* ========================================
   暗色模式
   ======================================== */

[data-theme="dark"] {
  --bg: #0f1117;
  --bg2: #1a1d27;
  --bg3: #242836;
  --bg4: #2e3345;
  --text: #e5e7eb;
  --text2: #9ca3af;
  --text3: #6b7280;
  --accent: #34d399;
  --accent2: #6ee7b7;
  --accent-soft: rgba(52,211,153,.1);
  --border: #2e3345;
  --border2: #3b4252;
  --shadow: rgba(0,0,0,.3);
  --nav-bg: rgba(15,17,23,.85);
  --warm: #f59e0b;
  --warm-soft: rgba(245,158,11,.1);
  --warm-bg: #1e1c17;
  --warm-border: #3d3520;
  --tone1-bg: rgba(59,130,246,.15);
  --tone2-bg: rgba(34,197,94,.15);
  --tone3-bg: rgba(202,138,4,.15);
  --tone4-bg: rgba(239,68,68,.15);
  --rusheng-bg: rgba(139,92,246,.15);
  --highlight: rgba(254,240,138,.2);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  transition: background .3s, color .3s;
}

a { color: inherit; text-decoration: none; }

/* ========================================
   动画关键帧
   ======================================== */

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(.95); }
  to { opacity: 1; transform: scale(1); }
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes countUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 滚动渐显（由 IntersectionObserver 驱动） */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .5s ease, transform .5s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   导航栏
   ======================================== */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  transition: background .3s, border-color .3s;
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  color: var(--text);
  cursor: pointer;
  transition: color .3s;
}

.nav-brand .seal {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 14px;
  font-weight: 700;
  font-family: 'Noto Serif SC', serif;
  transition: transform .3s;
}
.nav-brand:hover .seal { transform: rotate(-6deg) scale(1.05); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  font-size: 13px;
  color: var(--text3);
  padding: 6px 12px;
  border-radius: 6px;
  transition: all .25s;
  position: relative;
}
.nav-links a:hover { color: var(--text); background: var(--bg3); }
.nav-links a.active { color: var(--accent2); font-weight: 500; background: var(--accent-soft); }

/* 导航右侧功能按钮 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-actions button:not(.nav-hamburger) {
  width: 34px;
  height: 34px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text3);
  transition: all .25s;
}
.nav-actions button:not(.nav-hamburger):hover { background: var(--bg3); color: var(--text); }
.nav-actions button:not(.nav-hamburger) svg { width: 18px; height: 18px; }

/* 移动端汉堡菜单 */
.nav-hamburger {
  display: none;
  width: 34px;
  height: 34px;
  border: none;
  background: transparent;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 6px;
}
.nav-hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: all .3s;
}
.nav-hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(2.5px, 2.5px); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(2.5px, -2.5px); }

/* 移动端弹出菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 56px;
  left: 0;
  right: 0;
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  z-index: 99;
  animation: slideDown .2s ease;
  box-shadow: 0 8px 24px var(--shadow);
}
.mobile-menu.open { display: flex; flex-direction: column; gap: 4px; }
.mobile-menu a {
  font-size: 14px;
  color: var(--text2);
  padding: 10px 12px;
  border-radius: 8px;
  transition: all .2s;
}
.mobile-menu a:hover { background: var(--bg3); }
.mobile-menu a.active { color: var(--accent2); background: var(--accent-soft); font-weight: 500; }

/* ========================================
   页面容器与切换动画
   ======================================== */

.page { display: none; }
.page.visible {
  display: block;
  animation: fadeIn .3s ease;
}

.page-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 32px 80px;
}

/* ========================================
   首页 Hero
   ======================================== */

.hero {
  text-align: center;
  padding: 60px 20px 40px;
  animation: fadeInUp .6s ease;
}

.hero-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 36px;
  font-weight: 600;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

/* 非官方/民间标识徽章 */
.unofficial-badge {
  display: inline-block;
  font-size: 9px;
  font-weight: 600;
  font-family: 'Inter', system-ui, sans-serif;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: none;
  padding: 2px 8px;
  border-radius: 4px;
  vertical-align: super;
  margin-left: 6px;
  position: relative;
  top: -10px;
  opacity: .7;
  transition: background .3s, color .3s, opacity .3s;
}
.unofficial-badge:hover { opacity: 1; }

.hero-subtitle {
  font-size: 15px;
  color: var(--text2);
  margin-bottom: 32px;
}

/* 搜索框 */
.search-box {
  max-width: 520px;
  margin: 0 auto 48px;
  position: relative;
}

.search-box input {
  width: 100%;
  padding: 14px 20px 14px 44px;
  border: 1px solid var(--border2);
  border-radius: 12px;
  font-size: 15px;
  background: var(--bg2);
  color: var(--text);
  outline: none;
  transition: border-color .3s, box-shadow .3s, background .3s;
}
.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.search-box input::placeholder { color: var(--text3); }
.search-box .search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text3);
  transition: color .3s;
}

/* 统计卡片 */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}

.stat-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 20px;
  text-align: center;
  transition: all .3s;
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--shadow);
}
.stat-number {
  font-size: 32px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -1px;
  animation: countUp .5s ease;
}
.stat-label {
  font-size: 13px;
  color: var(--text3);
  margin-top: 4px;
}

/* 模块入口卡片 */
.module-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 48px;
}

.module-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 24px;
  cursor: pointer;
  transition: all .3s cubic-bezier(.4,0,.2,1);
  display: flex;
  flex-direction: column;
}
.module-card:hover {
  border-color: rgba(16,185,129,.4);
  box-shadow: 0 8px 24px rgba(16,185,129,.08);
  transform: translateY(-3px);
}
.module-card .mc-icon {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  background: var(--accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  color: var(--accent);
  transition: transform .3s;
}
.module-card:hover .mc-icon { transform: scale(1.08); }
.module-card.warm .mc-icon {
  background: var(--warm-soft);
  color: var(--warm);
}
.module-card .mc-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}
.module-card .mc-desc {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.6;
  flex: 1;
}
.module-card .mc-count {
  font-size: 12px;
  color: var(--text3);
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

/* 今日方言（随机词条） */
.daily-section { margin-bottom: 40px; }
.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 16px;
}
.daily-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.daily-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  transition: all .3s;
  animation: scaleIn .4s ease backwards;
}
.daily-card:nth-child(1) { animation-delay: 0s; }
.daily-card:nth-child(2) { animation-delay: .1s; }
.daily-card:nth-child(3) { animation-delay: .2s; }
.daily-card:hover {
  border-color: var(--border2);
  box-shadow: 0 4px 12px var(--shadow);
}
.daily-card .dc-headword {
  font-family: 'Noto Serif SC', serif;
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}
.daily-card .dc-gloss {
  font-size: 13px;
  color: var(--text2);
  line-height: 1.6;
}

/* ========================================
   音调标注 — 方案A（上标徽章，默认）
   ======================================== */

.tone-badge {
  font-size: 0.6em;
  padding: 1px 4px;
  border-radius: 3px;
  vertical-align: super;
  font-weight: 600;
  margin-left: 1px;
  display: inline;
  line-height: 1;
  transition: background .3s, color .3s;
}
.tone-badge.t1 { background: var(--tone1-bg); color: var(--tone1); }
.tone-badge.t2 { background: var(--tone2-bg); color: var(--tone2); }
.tone-badge.t3 { background: var(--tone3-bg); color: var(--tone3); }
.tone-badge.t4 { background: var(--tone4-bg); color: var(--tone4); }
.tone-badge.rusheng { background: var(--rusheng-bg); color: var(--rusheng); }
.tone-badge.long { background: transparent; color: var(--long-color); font-size: 0.8em; }
.tone-badge.erhua { background: transparent; color: var(--erhua); font-style: italic; font-size: 0.85em; }
.tone-char { /* 正常汉字 */ }

/* 方案B（极简圆点模式） */
body.tone-dots .tone-badge {
  font-size: 0;
  padding: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  display: inline-block;
  vertical-align: super;
  margin-left: 2px;
  background: currentColor;
}
body.tone-dots .tone-badge.t1 { color: var(--tone1); background: var(--tone1); }
body.tone-dots .tone-badge.t2 { color: var(--tone2); background: var(--tone2); }
body.tone-dots .tone-badge.t3 { color: var(--tone3); background: var(--tone3); }
body.tone-dots .tone-badge.t4 { color: var(--tone4); background: var(--tone4); }
body.tone-dots .tone-badge.rusheng { color: var(--rusheng); background: var(--rusheng); }
body.tone-dots .tone-badge.long {
  width: auto; height: auto; border-radius: 0; background: transparent;
  font-size: 0.7em; color: var(--long-color);
}
body.tone-dots .tone-badge.long::after { content: '~'; }
body.tone-dots .tone-badge.erhua {
  width: auto; height: auto; border-radius: 0; background: transparent;
  font-size: 0.75em; color: var(--erhua); font-style: italic;
}
body.tone-dots .tone-badge.erhua::after { content: '儿'; }

/* 图例条 */
.tone-legend {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 10px 16px;
  background: var(--bg3);
  border-radius: 8px;
  font-size: 12px;
  color: var(--text3);
  margin-bottom: 20px;
  transition: background .3s;
}
.tone-legend .tl-item { display: flex; align-items: center; gap: 4px; }
.tone-legend .tl-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }

/* 音调模式切换 */
.tone-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text3);
}
.tone-toggle button {
  padding: 4px 10px;
  border: 1px solid var(--border);
  background: var(--bg2);
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: all .25s;
  color: var(--text2);
}
.tone-toggle button.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent2);
}

/* ========================================
   词典页面
   ======================================== */

.dict-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 12px;
}

.dict-search {
  position: relative;
  flex: 1;
  max-width: 400px;
}
.dict-search input {
  width: 100%;
  padding: 10px 16px 10px 38px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--bg2);
  color: var(--text);
  outline: none;
  transition: border-color .25s, box-shadow .25s, background .3s;
}
.dict-search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.dict-search .search-icon {
  position: absolute;
  left: 12px; top: 50%; transform: translateY(-50%);
  width: 16px; height: 16px; color: var(--text3);
}

/* 卷册标签筛选 */
.volume-tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.volume-tabs button {
  padding: 5px 12px;
  border: 1px solid var(--border);
  background: var(--bg2);
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: all .25s;
  color: var(--text2);
}
.volume-tabs button.active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent2);
  font-weight: 500;
}

/* 词条列表 */
.entry-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.entry-item {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  transition: all .25s;
  animation: fadeInUp .3s ease backwards;
}
.entry-item:hover {
  border-color: var(--border2);
  box-shadow: 0 2px 8px var(--shadow);
}
.entry-headword {
  font-family: 'Noto Serif SC', serif;
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 4px;
}
.entry-gloss {
  font-size: 14px;
  color: var(--text2);
  line-height: 1.6;
}
.entry-variants {
  margin-top: 6px;
  font-size: 12px;
  color: var(--text3);
}
.entry-variants span {
  background: var(--bg3);
  padding: 2px 6px;
  border-radius: 4px;
  margin-right: 4px;
  display: inline-block;
  margin-bottom: 2px;
  transition: background .3s;
}
.entry-source {
  font-size: 11px;
  color: var(--text3);
  margin-top: 6px;
}

/* 分页 */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 24px;
  flex-wrap: wrap;
}
.pagination button {
  padding: 6px 14px;
  border: 1px solid var(--border);
  background: var(--bg2);
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  transition: all .25s;
  color: var(--text2);
}
.pagination button:hover { border-color: var(--border2); }
.pagination button:disabled { opacity: .4; cursor: default; }
.pagination button.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.pagination .page-info { font-size: 13px; color: var(--text3); }

/* ========================================
   学术档案
   ======================================== */

.academic-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 32px;
  padding: 20px;
  background: var(--warm-bg);
  border: 1px solid var(--warm-border);
  border-radius: 12px;
  transition: background .3s, border-color .3s;
}
.academic-nav a {
  font-size: 14px;
  color: var(--warm);
  padding: 8px 12px;
  border-radius: 6px;
  transition: all .2s;
  cursor: pointer;
}
.academic-nav a:hover {
  background: var(--warm-soft);
  color: var(--text);
}
.academic-nav a.active-ch {
  background: var(--warm-soft);
  color: var(--text);
  font-weight: 500;
}

.academic-chapter {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 72px;
}
.academic-chapter:last-child { border-bottom: none; }
.academic-chapter h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text);
}
.academic-chapter p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text2);
  margin-bottom: 12px;
  text-indent: 2em;
}

/* ========================================
   惯用俗语
   ======================================== */

.letter-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 24px;
  padding: 12px 16px;
  background: var(--bg3);
  border-radius: 10px;
  transition: background .3s;
}
.letter-nav a {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text2);
  transition: all .2s;
  cursor: pointer;
}
.letter-nav a:hover { background: var(--bg2); color: var(--accent); }
.letter-nav a.active { background: var(--accent); color: white; }
.letter-nav a.disabled { opacity: .3; pointer-events: none; }

.letter-group { margin-bottom: 32px; }
.letter-group h3 {
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-soft);
}

/* ========================================
   分类汇编
   ======================================== */

.category-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 24px;
}
.category-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 400px;
}
.category-table th,
.category-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  transition: background .3s;
}
.category-table th {
  background: var(--bg3);
  font-weight: 600;
  font-size: 13px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: sticky;
  top: 56px;
  z-index: 1;
}
.category-table td:first-child {
  font-weight: 500;
  width: 180px;
}
.category-table tr:hover td { background: var(--bg3); }
.category-table .dialect-cell {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.category-table .dialect-tag {
  background: var(--accent-soft);
  color: var(--accent2);
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 13px;
  font-family: 'Noto Serif SC', serif;
  transition: background .3s, color .3s;
}

/* ========================================
   今日方言页面
   ======================================== */

.daily-page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 16px;
}
.daily-refresh-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background .2s, transform .15s;
  flex-shrink: 0;
  margin-top: 6px;
}
.daily-refresh-btn:hover { background: var(--accent2); }
.daily-refresh-btn:active { transform: scale(.95); }
.daily-refresh-btn svg { width: 16px; height: 16px; }

.daily-page-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.daily-page-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 16px;
  transition: all .3s;
  animation: fadeInUp .4s ease both;
}
.daily-page-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px var(--shadow);
  transform: translateY(-2px);
}
.daily-page-card .dc-headword {
  font-family: 'Noto Serif SC', serif;
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}
.daily-page-card .dc-gloss {
  font-size: 13px;
  color: var(--text3);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .daily-page-header { flex-direction: column; align-items: stretch; }
  .daily-refresh-btn { align-self: flex-end; }
  .daily-page-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .daily-page-grid { grid-template-columns: 1fr; }
}

/* ========================================
   关于页面
   ======================================== */

.about-content {
  max-width: 100%;
}

.about-section {
  margin-bottom: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}
.about-section:last-child { border-bottom: none; }

.about-section h2 {
  font-family: 'Noto Serif SC', serif;
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text);
}

.about-section p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text2);
  margin-bottom: 10px;
}

.about-quote {
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  margin: 0 0 16px 0;
  background: var(--accent-soft);
  border-radius: 0 8px 8px 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text2);
  font-style: italic;
  transition: background .3s, border-color .3s;
}

.about-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.about-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 20px;
  transition: all .3s;
}
.about-card:hover {
  border-color: var(--border2);
  box-shadow: 0 4px 12px var(--shadow);
}
.about-card-year {
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
  font-family: 'Inter', system-ui, sans-serif;
}
.about-card-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text);
}
.about-card p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--text2);
  margin: 0;
}

.about-info-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.about-info-item {
  text-align: center;
  padding: 16px 8px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: background .3s, border-color .3s;
}
.about-info-num {
  display: block;
  font-size: 24px;
  font-weight: 700;
  color: var(--accent);
}
.about-info-label {
  display: block;
  font-size: 12px;
  color: var(--text3);
  margin-top: 4px;
}

.about-notice {
  padding: 14px 18px;
  background: var(--warm-bg);
  border: 1px solid var(--warm-border);
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text2);
  transition: background .3s, border-color .3s;
}

.about-tone-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
}
.about-tone-table th,
.about-tone-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  transition: background .3s;
}
.about-tone-table th {
  background: var(--bg3);
  font-weight: 600;
  font-size: 13px;
  color: var(--text3);
}
.about-tone-table td:first-child { width: 80px; }

.about-tech {
  padding: 20px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: background .3s, border-color .3s;
}
.about-tech p {
  font-size: 14px;
  margin-bottom: 8px;
  color: var(--text2);
}
.about-tech p:last-child { margin-bottom: 0; }
.about-tech a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.about-tech a:hover { color: var(--accent2); }

.about-disclaimer {
  font-size: 13px;
  color: var(--text3);
  line-height: 1.7;
}

@media (max-width: 768px) {
  .about-cards { grid-template-columns: 1fr; }
  .about-info-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ========================================
   搜索结果 / 高亮
   ======================================== */

.search-results-header {
  font-size: 14px;
  color: var(--text3);
  margin-bottom: 16px;
}
.search-results-header strong { color: var(--text); }
.search-highlight {
  background: var(--highlight);
  padding: 0 2px;
  border-radius: 2px;
}

/* ========================================
   Footer
   ======================================== */

.site-footer {
  padding: 24px 32px;
  text-align: center;
  border-top: 1px solid var(--border);
  background: var(--bg);
  transition: background .3s, border-color .3s;
}
.site-footer p { font-size: 12px; color: var(--text3); line-height: 1.8; }
.site-footer a { color: var(--accent); transition: color .2s; }
.site-footer a:hover { color: var(--accent2); }

/* 无结果提示 */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text3);
}
.empty-state svg { width: 48px; height: 48px; opacity: .3; margin-bottom: 16px; }
.empty-state p { font-size: 14px; }

/* ========================================
   页面标题统一样式
   ======================================== */
.page-title {
  font-family: 'Noto Serif SC', serif;
  font-size: 28px;
  font-weight: 600;
  margin-bottom: 8px;
  animation: fadeInUp .4s ease;
}
.page-subtitle {
  font-size: 14px;
  color: var(--text3);
  margin-bottom: 24px;
}

/* ========================================
   响应式
   ======================================== */

@media (max-width: 768px) {
  .site-nav { padding: 0 16px; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  .page-container { padding: 24px 16px 60px; }

  .hero { padding: 28px 8px 20px; }
  .hero-title { font-size: 24px; letter-spacing: 1px; }
  .hero-subtitle { font-size: 13px; margin-bottom: 24px; }

  .stats-row { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat-card { padding: 16px 12px; }
  .stat-number { font-size: 24px; }

  .module-grid { grid-template-columns: 1fr; }
  .daily-cards { grid-template-columns: 1fr; }

  .dict-header { flex-direction: column; align-items: stretch; }
  .dict-search { max-width: 100%; }

  .volume-tabs { gap: 6px; }
  .volume-tabs button { padding: 6px 10px; font-size: 11px; }

  .letter-nav a { width: 28px; height: 28px; font-size: 12px; }
  .letter-nav { padding: 10px 12px; gap: 3px; }

  .entry-item { padding: 14px 16px; }
  .entry-headword { font-size: 16px; }

  .page-title { font-size: 24px; }

  .category-table td:first-child { width: 120px; }

  .academic-nav { padding: 16px; }
  .academic-chapter h2 { font-size: 19px; }
  .academic-chapter p { font-size: 14px; line-height: 1.7; }

  .tone-legend { gap: 10px; padding: 8px 12px; }

  .pagination { gap: 4px; }
  .pagination button { padding: 6px 10px; font-size: 12px; }

  .site-footer { padding: 20px 16px; }
}

@media (max-width: 480px) {
  .stats-row { grid-template-columns: 1fr 1fr; gap: 8px; }
  .nav-brand .brand-text { display: none; }
  .hero-title { font-size: 22px; }
  .stat-number { font-size: 22px; }
  .volume-tabs button { font-size: 10px; padding: 4px 8px; }
}