/* ============ 全局样式 ============ */
:root {
  /* 宣纸色系 */
  --paper-bg: #f5efe0;
  --paper-light: #faf6ec;
  --paper-dark: #ebe1c9;
  --paper-border: #d9ccaa;

  /* 墨色 */
  --ink-black: #2a2320;
  --ink-dark: #3d342e;
  --ink-mid: #5c5149;
  --ink-light: #8a7c70;

  /* 朱砂印色 */
  --vermilion: #a8312a;
  --vermilion-dark: #8a261f;
  --vermilion-light: #c94a42;

  /* 竹青色 */
  --bamboo: #5d7a50;
  --bamboo-light: #7a9a6c;
  --bamboo-dark: #45613a;

  /* 金棕色 */
  --gold: #a67c3d;
  --gold-light: #c9a05c;

  /* 字体 */
  --font-display: "Ma Shan Zheng", "STKaiti", "KaiTi", serif;
  --font-title: "ZCOOL XiaoWei", "STKaiti", "KaiTi", serif;
  --font-body: "Noto Serif SC", "STSong", "SimSun", serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--ink-dark);
  background-color: var(--paper-bg);
  background-image:
    radial-gradient(ellipse at 20% 30%, rgba(168, 49, 42, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(93, 122, 80, 0.04) 0%, transparent 50%),
    url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  line-height: 1.9;
  font-size: 16px;
}

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

::selection {
  background: var(--vermilion);
  color: var(--paper-light);
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--paper-dark);
}
::-webkit-scrollbar-thumb {
  background: var(--ink-light);
  border-radius: 0;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--ink-mid);
}

/* ============ 导航栏 ============ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, var(--paper-bg) 0%, rgba(245, 239, 224, 0.95) 100%);
  border-bottom: 2px solid var(--paper-border);
  backdrop-filter: blur(8px);
}

.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

.brand-seal {
  width: 42px;
  height: 42px;
  background: var(--vermilion);
  color: var(--paper-light);
  font-family: var(--font-display);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
  box-shadow: 0 2px 8px rgba(168, 49, 42, 0.3);
  letter-spacing: 1px;
  line-height: 1.1;
  flex-direction: column;
}

.brand-seal-text {
  writing-mode: vertical-rl;
  text-orientation: upright;
  letter-spacing: 4px;
  font-size: 15px;
  line-height: 1;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text-main {
  font-family: var(--font-display);
  font-size: 26px;
  color: var(--ink-black);
  letter-spacing: 4px;
}

.brand-text-sub {
  font-size: 11px;
  color: var(--ink-light);
  letter-spacing: 2px;
}

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}

.nav-links li {
  position: relative;
}

.nav-link {
  display: inline-block;
  padding: 8px 20px;
  font-family: var(--font-title);
  font-size: 17px;
  color: var(--ink-dark);
  cursor: pointer;
  position: relative;
  transition: color 0.2s;
  letter-spacing: 3px;
}

.nav-link:hover {
  color: var(--vermilion);
}

.nav-link.active {
  color: var(--vermilion);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 3px;
  background: var(--vermilion);
  border-radius: 2px;
}

/* 汉堡菜单按钮 */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink-dark);
  border-radius: 2px;
  transition: all 0.3s ease;
  margin: 0 auto;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 移动端下拉菜单 */
.nav-mobile {
  display: none;
  list-style: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--paper-bg);
  border-bottom: 2px solid var(--paper-border);
  margin: 0;
  padding: 8px 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.nav-mobile.open {
  max-height: 320px;
}

.nav-mobile li {
  width: 100%;
}

.nav-mobile .nav-link {
  display: block;
  width: 100%;
  padding: 14px 24px;
  font-family: var(--font-title);
  font-size: 17px;
  letter-spacing: 2px;
  box-sizing: border-box;
  border-bottom: 1px solid rgba(200, 190, 160, 0.3);
}

.nav-mobile li:last-child .nav-link {
  border-bottom: none;
}

.nav-mobile .nav-link.active {
  color: var(--vermilion);
  background: rgba(168, 49, 42, 0.05);
}

.nav-mobile .nav-link.active::after {
  display: none;
}

/* ============ 主内容区 ============ */
.main-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  min-height: calc(100vh - 72px - 120px);
}

/* ============ 页脚 ============ */
.footer {
  margin-top: 80px;
  padding: 40px 32px;
  background: var(--ink-black);
  color: var(--paper-light);
  text-align: center;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--paper-light);
  margin-bottom: 8px;
  letter-spacing: 6px;
}

.footer-tagline {
  font-size: 13px;
  color: var(--ink-light);
  letter-spacing: 4px;
  margin-bottom: 20px;
}

.footer-divider {
  width: 60px;
  height: 1px;
  background: var(--vermilion);
  margin: 20px auto;
}

.footer-quote {
  font-family: var(--font-title);
  font-size: 15px;
  color: var(--paper-dark);
  font-style: italic;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.footer-copy {
  font-size: 12px;
  color: var(--ink-light);
  letter-spacing: 1px;
}

.footer-beian {
  margin-top: 12px;
  font-size: 11px;
  color: rgba(138, 124, 112, 0.55);
  letter-spacing: 1px;
  text-align: center;
}

/* ============ 首页 Hero ============ */
.hero {
  position: relative;
  padding: 80px 0 100px;
  text-align: center;
}

.hero-seal-bg {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 400px;
  font-family: var(--font-display);
  color: rgba(168, 49, 42, 0.04);
  pointer-events: none;
  user-select: none;
  line-height: 1;
}

.hero-chars {
  font-family: var(--font-display);
  font-size: 160px;
  color: var(--ink-black);
  letter-spacing: 60px;
  line-height: 1;
  margin-bottom: 24px;
  position: relative;
  z-index: 1;
  text-indent: 30px;
}

.hero-subtitle {
  font-family: var(--font-title);
  font-size: 24px;
  color: var(--ink-mid);
  letter-spacing: 8px;
  margin-bottom: 40px;
  position: relative;
  z-index: 1;
}

.hero-desc {
  font-size: 17px;
  color: var(--ink-light);
  max-width: 680px;
  margin: 0 auto 50px;
  line-height: 2;
  position: relative;
  z-index: 1;
  letter-spacing: 2px;
}

.hero-divider {
  width: 80px;
  height: 3px;
  background: var(--vermilion);
  margin: 0 auto 50px;
  position: relative;
  z-index: 1;
}

.hero-quote {
  font-family: var(--font-title);
  font-size: 22px;
  color: var(--ink-dark);
  line-height: 2.2;
  letter-spacing: 4px;
  position: relative;
  z-index: 1;
}

.hero-quote-mark {
  color: var(--vermilion);
  font-size: 32px;
  margin: 0 8px;
  vertical-align: middle;
}

/* 首页功能卡片 */
.home-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 40px 0 80px;
}

.home-card {
  background: var(--paper-light);
  border: 1px solid var(--paper-border);
  padding: 40px 28px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.home-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--vermilion);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s;
}

.home-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(42, 35, 32, 0.12);
  border-color: var(--vermilion);
}

.home-card:hover::before {
  transform: scaleX(1);
}

.home-card-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border: 2px solid var(--vermilion);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--vermilion);
}

.home-card-title {
  font-family: var(--font-title);
  font-size: 22px;
  color: var(--ink-black);
  letter-spacing: 4px;
  margin-bottom: 10px;
}

.home-card-desc {
  font-size: 14px;
  color: var(--ink-light);
  line-height: 1.8;
  letter-spacing: 1px;
}

/* ============ 页面标题 ============ */
.page-header {
  text-align: center;
  padding: 60px 0 40px;
  position: relative;
}

.page-title {
  font-family: var(--font-display);
  font-size: 56px;
  color: var(--ink-black);
  letter-spacing: 12px;
  margin-bottom: 12px;
}

.page-subtitle {
  font-family: var(--font-title);
  font-size: 18px;
  color: var(--ink-light);
  letter-spacing: 6px;
}

.page-divider {
  width: 60px;
  height: 3px;
  background: var(--vermilion);
  margin: 24px auto 0;
}

/* ============ 介绍页面 ============ */
.intro-section {
  padding: 40px 0 60px;
}

.intro-hero {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 50px;
  align-items: start;
  padding: 40px 0;
}

.intro-portrait {
  background: var(--paper-light);
  border: 1px solid var(--paper-border);
  padding: 24px;
  position: relative;
}

.intro-portrait::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 8px;
  right: -8px;
  bottom: -8px;
  border: 2px solid var(--vermilion);
  opacity: 0.3;
  z-index: -1;
}

.portrait-frame {
  aspect-ratio: 3/4;
  background: var(--paper-bg);
  border: 1px solid var(--paper-border);
  position: relative;
  overflow: hidden;
}

.portrait-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
}

.portrait-seal {
  position: absolute;
  bottom: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  background: var(--vermilion);
  color: var(--paper-light);
  font-family: var(--font-display);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1.2;
  text-align: center;
  letter-spacing: 1px;
  padding: 4px;
}

.portrait-caption {
  text-align: center;
  margin-top: 16px;
  font-family: var(--font-title);
  font-size: 18px;
  color: var(--ink-mid);
  letter-spacing: 4px;
}

.info-table {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 0;
  border-top: 2px solid var(--ink-dark);
}

.info-row {
  display: contents;
}

.info-row dt,
.info-row dd {
  padding: 16px 0;
  border-bottom: 1px solid var(--paper-border);
}

.info-row dt {
  font-family: var(--font-title);
  font-size: 16px;
  color: var(--ink-mid);
  letter-spacing: 3px;
  text-align: right;
  padding-right: 24px;
}

.info-row dd {
  font-size: 16px;
  color: var(--ink-dark);
  padding-left: 24px;
}

.section-title {
  font-family: var(--font-title);
  font-size: 32px;
  color: var(--ink-black);
  letter-spacing: 6px;
  margin-bottom: 30px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.section-title::before {
  content: "";
  width: 6px;
  height: 32px;
  background: var(--vermilion);
}

.thought-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.thought-card {
  background: var(--paper-light);
  border: 1px solid var(--paper-border);
  padding: 28px;
  position: relative;
}

.thought-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 40px;
  height: 40px;
  border-top: 3px solid var(--vermilion);
  border-left: 3px solid var(--vermilion);
}

.thought-card-title {
  font-family: var(--font-title);
  font-size: 22px;
  color: var(--vermilion);
  letter-spacing: 4px;
  margin-bottom: 14px;
}

.thought-card-content {
  font-size: 15px;
  color: var(--ink-dark);
  line-height: 2;
  text-indent: 2em;
}

.influence-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.influence-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 40px;
  padding: 24px 0;
  border-bottom: 1px solid var(--paper-border);
}

.influence-item:last-child {
  border-bottom: none;
}

.influence-item-title {
  font-family: var(--font-title);
  font-size: 22px;
  color: var(--ink-black);
  letter-spacing: 4px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.influence-num {
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--vermilion);
  line-height: 1;
}

.influence-item-content {
  font-size: 16px;
  color: var(--ink-dark);
  line-height: 2;
  text-indent: 2em;
}

/* ============ 生平时间线 ============ */
.timeline {
  position: relative;
  padding: 40px 0 80px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 180px;
  width: 2px;
  background: var(--paper-border);
}

.timeline-item {
  display: grid;
  grid-template-columns: 160px 40px 1fr;
  gap: 20px;
  margin-bottom: 40px;
  position: relative;
}

.timeline-year {
  font-family: var(--font-title);
  font-size: 18px;
  color: var(--vermilion);
  text-align: right;
  padding-top: 4px;
  letter-spacing: 2px;
  font-weight: 600;
}

.timeline-node {
  position: relative;
  z-index: 1;
}

.timeline-node-inner {
  width: 20px;
  height: 20px;
  background: var(--paper-bg);
  border: 3px solid var(--vermilion);
  border-radius: 50%;
  margin-top: 8px;
  margin-left: 10px;
}

.timeline-content {
  background: var(--paper-light);
  border: 1px solid var(--paper-border);
  padding: 24px 28px;
  position: relative;
}

.timeline-content::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 14px;
  width: 18px;
  height: 18px;
  background: var(--paper-light);
  border-left: 1px solid var(--paper-border);
  border-bottom: 1px solid var(--paper-border);
  transform: rotate(45deg);
}

.timeline-title {
  font-family: var(--font-title);
  font-size: 22px;
  color: var(--ink-black);
  letter-spacing: 3px;
  margin-bottom: 6px;
}

.timeline-location {
  font-size: 13px;
  color: var(--ink-light);
  letter-spacing: 2px;
  margin-bottom: 14px;
  padding-left: 8px;
  border-left: 3px solid var(--bamboo);
}

.timeline-desc {
  font-size: 15px;
  color: var(--ink-dark);
  line-height: 2;
  text-indent: 2em;
}

/* ============ 故事页面 ============ */
.stories-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  padding: 40px 0 80px;
}

.story-card {
  background: var(--paper-light);
  border: 1px solid var(--paper-border);
  padding: 28px;
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
}

.story-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(42, 35, 32, 0.12);
  border-color: var(--vermilion);
}

.story-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bamboo);
  color: var(--paper-light);
  font-size: 12px;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.story-title {
  font-family: var(--font-title);
  font-size: 24px;
  color: var(--ink-black);
  letter-spacing: 3px;
  margin-bottom: 12px;
}

.story-summary {
  font-size: 15px;
  color: var(--ink-mid);
  line-height: 1.9;
  margin-bottom: 16px;
}

.story-read-more {
  font-size: 13px;
  color: var(--vermilion);
  letter-spacing: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 故事详情弹窗 */
.story-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(42, 35, 32, 0.6);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.story-modal {
  background: var(--paper-bg);
  max-width: 720px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  position: relative;
  border: 2px solid var(--vermilion);
  padding: 40px;
}

.story-modal-close {
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 28px;
  color: var(--ink-light);
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font-body);
  line-height: 1;
  transition: color 0.2s;
}

.story-modal-close:hover {
  color: var(--vermilion);
}

.story-modal-title {
  font-family: var(--font-display);
  font-size: 36px;
  color: var(--ink-black);
  letter-spacing: 6px;
  margin-bottom: 8px;
  text-align: center;
}

.story-modal-tag {
  text-align: center;
  color: var(--bamboo);
  font-size: 13px;
  letter-spacing: 3px;
  margin-bottom: 24px;
}

.story-modal-divider {
  width: 40px;
  height: 2px;
  background: var(--vermilion);
  margin: 0 auto 28px;
}

.story-modal-content {
  font-size: 16px;
  color: var(--ink-dark);
  line-height: 2.2;
  white-space: pre-line;
  text-indent: 2em;
}

.story-modal-source {
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--paper-border);
  font-size: 13px;
  color: var(--ink-light);
  letter-spacing: 1px;
  text-align: right;
  text-indent: 0;
}

/* ============ 道德经页面 ============ */
.daodejing-layout {
  display: grid;
  grid-template-columns: 220px 1fr 280px;
  gap: 24px;
  padding: 30px 0 60px;
  --reading-font-size: 19px;
  --commentary-font-size: 14px;
  --chapter-title-size: 48px;
}

/* 章节导航 */
.chapter-nav {
  background: var(--paper-light);
  border: 1px solid var(--paper-border);
  padding: 20px;
  position: sticky;
  top: 92px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.chapter-nav-title {
  font-family: var(--font-title);
  font-size: 18px;
  color: var(--ink-black);
  letter-spacing: 4px;
  margin-bottom: 6px;
  text-align: center;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--vermilion);
}

.chapter-nav-section {
  margin-top: 14px;
}

.chapter-nav-section-title {
  font-family: var(--font-title);
  font-size: 14px;
  color: var(--bamboo);
  letter-spacing: 3px;
  margin-bottom: 8px;
  padding-left: 8px;
  border-left: 3px solid var(--bamboo);
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.chapter-btn {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--paper-bg);
  border: 1px solid var(--paper-border);
  font-family: var(--font-title);
  font-size: 13px;
  color: var(--ink-mid);
  cursor: pointer;
  transition: all 0.2s;
}

.chapter-btn:hover {
  background: var(--vermilion);
  color: var(--paper-light);
  border-color: var(--vermilion);
}

.chapter-btn.active {
  background: var(--ink-black);
  color: var(--paper-light);
  border-color: var(--ink-black);
}

.chapter-btn.disabled {
  background: transparent;
  color: var(--paper-border);
  border-color: var(--paper-border);
  cursor: not-allowed;
  opacity: 0.5;
}

.chapter-btn.disabled:hover {
  background: transparent;
  color: var(--paper-border);
  border-color: var(--paper-border);
}

/* 阅读区 */
.reading-area {
  background: var(--paper-light);
  border: 1px solid var(--paper-border);
  padding: 40px 48px;
  min-height: 600px;
}

.version-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 30px;
  border-bottom: 2px solid var(--paper-border);
  padding-bottom: 0;
}

.version-tab {
  padding: 10px 22px;
  font-family: var(--font-title);
  font-size: 16px;
  color: var(--ink-mid);
  cursor: pointer;
  letter-spacing: 3px;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
}

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

.version-tab.active {
  color: var(--vermilion);
  border-bottom-color: var(--vermilion);
}

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

.chapter-number {
  font-family: var(--font-display);
  font-size: 48px;
  color: var(--vermilion);
  letter-spacing: 8px;
  line-height: 1.2;
  margin-bottom: 8px;
  word-break: keep-all;
  white-space: nowrap;
}

.chapter-section-label {
  font-size: 13px;
  color: var(--ink-light);
  letter-spacing: 4px;
  margin-bottom: 4px;
}

.chapter-title-main {
  font-family: var(--font-title);
  font-size: 20px;
  color: var(--ink-dark);
  letter-spacing: 4px;
}

.chapter-text {
  font-family: var(--font-body);
  font-size: var(--reading-font-size);
  color: var(--ink-dark);
  line-height: 2.4;
  letter-spacing: 2px;
  margin-bottom: 30px;
  padding: 20px 0;
}

.chapter-text p {
  text-indent: 2em;
  margin-bottom: 12px;
}

.sentence-link {
  cursor: pointer;
  transition: background-color 0.3s ease, color 0.3s ease;
  border-bottom: 1px dashed transparent;
}

.sentence-link:hover {
  color: var(--bamboo-dark);
  border-bottom-color: var(--bamboo-light);
}

.sentence-highlight {
  background-color: rgba(167, 139, 92, 0.28);
  border-radius: 2px;
  transition: background-color 0.6s ease;
}

/* 阅读工具栏 */
.reading-toolbar {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 12px 16px;
  margin-bottom: 20px;
  background: var(--paper-bg);
  border: 1px solid var(--paper-border);
  border-radius: 4px;
  flex-wrap: wrap;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.toolbar-label {
  font-family: var(--font-title);
  font-size: 13px;
  color: var(--ink-light);
  letter-spacing: 2px;
}

.toolbar-btns {
  display: flex;
  gap: 4px;
}

.toolbar-btn {
  padding: 4px 12px;
  background: var(--paper-light);
  border: 1px solid var(--paper-border);
  font-family: var(--font-title);
  font-size: 13px;
  color: var(--ink-mid);
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.2s;
}

.toolbar-btn:hover {
  border-color: var(--bamboo);
  color: var(--bamboo-dark);
}

.toolbar-btn.active {
  background: var(--bamboo);
  color: var(--paper-light);
  border-color: var(--bamboo);
}

/* 楚简本提示条 */
.chujian-notice {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  margin-bottom: 16px;
  background: linear-gradient(90deg, rgba(167, 139, 92, 0.08), transparent);
  border-left: 3px solid var(--bamboo);
  border-radius: 2px;
  font-size: 14px;
  color: var(--ink-mid);
}

.chujian-notice-icon {
  font-size: 18px;
}

.chujian-notice-text {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 1px;
}

/* 楚简本组别标签 */
.chujian-group-badge {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 20px;
  background: var(--paper-bg);
  border: 1px solid var(--bamboo);
  border-radius: 20px;
  font-family: var(--font-title);
  font-size: 14px;
  color: var(--bamboo-dark);
  letter-spacing: 2px;
}

.notes-label {
  margin-top: 30px;
  margin-bottom: 8px;
  font-family: var(--font-title);
  font-size: 15px;
  font-weight: 600;
  color: var(--vermilion);
  letter-spacing: 2px;
  text-indent: 0 !important;
}

.chujian-notes {
  font-size: 0.85em;
  line-height: 1.9;
  color: var(--ink-mid);
  background: var(--paper-bg);
  padding: 16px 20px;
  border-left: 3px solid var(--bamboo);
  border-radius: 2px;
  text-indent: 2em;
}

/* 傅奕本专属 */
.fuyi-notice {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 16px;
  margin-bottom: 16px;
  background: linear-gradient(90deg, rgba(194, 58, 58, 0.06), transparent);
  border-left: 3px solid var(--vermilion);
  border-radius: 2px;
  font-size: 13px;
  color: var(--ink-mid);
  line-height: 1.7;
}

.fuyi-notice-icon {
  font-size: 18px;
  flex-shrink: 0;
  margin-top: 1px;
}

.fuyi-notice-text {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.5px;
}

.fuyi-badge {
  display: inline-block;
  padding: 4px 14px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(194, 58, 58, 0.08), rgba(194, 58, 58, 0.02));
  border: 1px solid var(--vermilion);
  border-radius: 20px;
  font-family: var(--font-title);
  font-size: 14px;
  color: var(--vermilion);
  letter-spacing: 2px;
}

/* 傅奕本独有字浅朱砂底高亮 */
.fuyi-paragraph .fuyi-text {
  background: linear-gradient(transparent 60%, rgba(194, 58, 58, 0.08) 60%, rgba(194, 58, 58, 0.08) 90%, transparent 90%);
  border-radius: 2px;
  padding: 0 2px;
}

/* 校记按钮 */
.collation-btn-group {
  margin-left: auto;
}

.collation-trigger-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: var(--vermilion);
  border: 1px solid var(--vermilion);
  font-family: var(--font-title);
  font-size: 13px;
  color: var(--paper-light);
  cursor: pointer;
  border-radius: 4px;
  letter-spacing: 2px;
  transition: all 0.2s;
}

.collation-trigger-btn:hover {
  background: #a82e2e;
  border-color: #a82e2e;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(194, 58, 58, 0.3);
}

.collation-trigger-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--paper-light);
  border-radius: 50%;
  font-size: 11px;
  font-weight: 600;
  line-height: 1;
}

/* 校记弹窗 */
.collation-modal-mask {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(30, 20, 10, 0.5);
  backdrop-filter: blur(3px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.collation-modal {
  position: relative;
  width: 100%;
  max-width: 680px;
  max-height: 85vh;
  background: #f5ecd7;
  background-image:
    radial-gradient(ellipse at 20% 30%, rgba(139, 100, 50, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(139, 100, 50, 0.08) 0%, transparent 50%),
    repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(139, 100, 50, 0.015) 2px, rgba(139, 100, 50, 0.015) 3px);
  border: 1px solid #c9b58c;
  border-radius: 4px;
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(201, 181, 140, 0.3) inset;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.collation-modal-header {
  padding: 24px 32px 16px;
  border-bottom: 1px solid rgba(201, 181, 140, 0.4);
  text-align: center;
  position: relative;
}

.collation-modal-title {
  font-family: var(--font-title);
  font-size: 22px;
  color: #5a3e2b;
  letter-spacing: 6px;
  margin-bottom: 6px;
}

.collation-modal-subtitle {
  font-size: 13px;
  color: #8a6f4f;
  letter-spacing: 2px;
}

.collation-close-btn {
  position: absolute;
  top: 20px;
  right: 24px;
  width: 28px;
  height: 28px;
  background: transparent;
  border: 1px solid #c9b58c;
  border-radius: 50%;
  color: #8a6f4f;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.collation-close-btn:hover {
  background: var(--vermilion);
  color: var(--paper-light);
  border-color: var(--vermilion);
}

.collation-modal-body {
  padding: 20px 32px;
  overflow-y: auto;
  flex: 1;
}

.collation-item {
  padding: 14px 0;
  border-bottom: 1px dashed rgba(201, 181, 140, 0.4);
  display: flex;
  gap: 14px;
}

.collation-item:last-child {
  border-bottom: none;
}

.collation-type-tag {
  flex-shrink: 0;
  padding: 2px 10px;
  height: fit-content;
  border: 1px solid;
  border-radius: 20px;
  font-family: var(--font-title);
  font-size: 11px;
  letter-spacing: 2px;
  background: rgba(255, 255, 255, 0.3);
  white-space: nowrap;
}

.collation-item-text {
  flex: 1;
  font-size: 15px;
  line-height: 1.85;
  color: #5a4a38;
  text-indent: 2em;
  margin: 0;
  font-family: var(--font-body);
}

.collation-modal-footer {
  padding: 14px 32px 20px;
  border-top: 1px solid rgba(201, 181, 140, 0.4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: #8a6f4f;
}

.collation-close-main-btn {
  padding: 8px 28px;
  background: var(--vermilion);
  border: none;
  color: var(--paper-light);
  font-family: var(--font-title);
  font-size: 14px;
  letter-spacing: 3px;
  cursor: pointer;
  border-radius: 3px;
  transition: all 0.2s;
}

.collation-close-main-btn:hover {
  background: #a82e2e;
}

/* 楚简本缺章提示 */
.chujian-missing {
  text-align: center;
  padding: 80px 20px;
  color: var(--ink-light);
}

.chujian-missing-icon {
  font-size: 48px;
  font-family: var(--font-display);
  color: var(--paper-border);
  margin-bottom: 16px;
}

.chujian-missing-title {
  font-family: var(--font-title);
  font-size: 20px;
  color: var(--ink-mid);
  letter-spacing: 4px;
  margin-bottom: 12px;
}

.chujian-missing-desc {
  font-size: 14px;
  color: var(--ink-light);
  line-height: 1.8;
  max-width: 360px;
  margin: 0 auto;
  text-indent: 2em;
  text-align: left;
}

/* 护眼模式 */
body.eye-care-mode {
  --paper-bg: #f4ecd8;
  --paper-light: #f7f0dd;
  --paper-cream: #ebe1c6;
  --paper-border: #d9ccae;
  --ink: #5c4e3a;
  --ink-dark: #4a3e2d;
  --ink-light: #8a7d66;
  --ink-mid: #6b5d48;
}

body.eye-care-mode .daodejing-page,
body.eye-care-mode .reading-area,
body.eye-care-mode .chapter-nav,
body.eye-care-mode .commentary-panel {
  background-color: var(--paper-light);
}

body.eye-care-mode .chapter-text {
  color: var(--ink-dark);
}

body.eye-care-mode .sentence-link:hover {
  color: var(--bamboo-dark);
}

.chapter-nav-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px dashed var(--paper-border);
}

.nav-btn {
  padding: 10px 24px;
  background: var(--paper-bg);
  border: 1px solid var(--paper-border);
  font-family: var(--font-title);
  font-size: 15px;
  color: var(--ink-dark);
  cursor: pointer;
  letter-spacing: 2px;
  transition: all 0.2s;
}

.nav-btn:hover:not(:disabled) {
  background: var(--vermilion);
  color: var(--paper-light);
  border-color: var(--vermilion);
}

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

/* 注释面板 */
.commentary-panel {
  background: var(--paper-light);
  border: 1px solid var(--paper-border);
  padding: 20px;
  position: sticky;
  top: 92px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

.commentary-title {
  font-family: var(--font-title);
  font-size: 18px;
  color: var(--ink-black);
  letter-spacing: 4px;
  margin-bottom: 6px;
  text-align: center;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--gold);
}

.commentators {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 14px;
}

.commentator-btn {
  padding: 10px 14px;
  background: none;
  border: none;
  text-align: left;
  font-family: var(--font-title);
  font-size: 15px;
  color: var(--ink-mid);
  cursor: pointer;
  letter-spacing: 2px;
  border-left: 3px solid transparent;
  transition: all 0.2s;
}

.commentator-btn:hover {
  color: var(--vermilion);
  background: var(--paper-bg);
}

.commentator-btn.active {
  color: var(--vermilion);
  border-left-color: var(--vermilion);
  background: var(--paper-bg);
}

.commentary-content {
  margin-top: 16px;
  padding: 16px;
  background: var(--paper-bg);
  border: 1px solid var(--paper-border);
  font-size: var(--commentary-font-size);
  color: var(--ink-dark);
  line-height: 2;
}

.commentary-line {
  transition: background-color 0.3s ease, color 0.3s ease;
  border-radius: 3px;
  padding: 2px 4px;
  margin: 2px -4px;
  cursor: pointer;
}

.commentary-line:hover {
  background-color: rgba(181, 114, 89, 0.08);
  color: var(--vermilion);
}

.commentary-heading {
  color: var(--vermilion);
  font-weight: 600;
  margin-bottom: 8px;
  text-indent: 0 !important;
  border-left: 3px solid var(--vermilion);
  padding-left: 10px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  border-radius: 2px;
}

.commentary-heading:hover {
  background-color: rgba(181, 114, 89, 0.08);
}

.comment-highlight {
  background-color: rgba(181, 114, 89, 0.22) !important;
  border-radius: 3px;
  transition: background-color 0.6s ease;
}

.commentator-intro {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px dashed var(--paper-border);
  font-size: 12px;
  color: var(--ink-light);
  line-height: 1.8;
}

.commentator-intro-name {
  font-family: var(--font-title);
  font-size: 15px;
  color: var(--ink-mid);
  margin-bottom: 4px;
  letter-spacing: 2px;
}

/* 版本说明面板 */
.version-info {
  margin-top: 20px;
  padding: 16px;
  background: var(--paper-bg);
  border: 1px solid var(--paper-border);
  font-size: 13px;
  color: var(--ink-mid);
  line-height: 1.9;
}

.version-info-name {
  font-family: var(--font-title);
  font-size: 16px;
  color: var(--vermilion);
  letter-spacing: 2px;
  margin-bottom: 4px;
}

.version-info-era {
  font-size: 12px;
  color: var(--ink-light);
  margin-bottom: 8px;
}

.version-info-features {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}

.version-feature-tag {
  padding: 2px 8px;
  background: var(--paper-dark);
  font-size: 11px;
  color: var(--ink-mid);
  border-radius: 2px;
}

/* ============ 响应式 ============ */
@media (max-width: 1024px) {
  .home-cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .daodejing-layout {
    grid-template-columns: 1fr;
  }
  .chapter-nav, .commentary-panel {
    position: static;
    max-height: none;
  }
  .chapter-grid {
    grid-template-columns: repeat(8, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar-inner {
    padding: 0 16px;
    height: 56px;
  }
  .brand {
    gap: 8px;
  }
  .brand-seal {
    width: 34px;
    height: 34px;
  }
  .brand-seal-text {
    font-size: 12px;
    letter-spacing: 2px;
  }
  .brand-text-main {
    font-size: 18px;
    letter-spacing: 2px;
  }
  .brand-text-sub {
    font-size: 9px;
    letter-spacing: 1px;
  }
  .nav-desktop {
    display: none;
  }
  .hamburger {
    display: flex;
  }
  .nav-mobile {
    display: block;
  }
  .main-content {
    padding: 0 16px;
  }
  .hero-chars {
    font-size: 80px;
    letter-spacing: 30px;
  }
  .home-cards {
    grid-template-columns: 1fr;
  }
  .intro-hero {
    grid-template-columns: 1fr;
  }
  .timeline-item {
    grid-template-columns: 20px 1fr;
    gap: 12px;
    margin-bottom: 28px;
  }
  .timeline::before {
    left: 9px;
  }
  .timeline-year {
    font-size: 13px;
    writing-mode: horizontal-tb;
    text-orientation: mixed;
    text-align: left;
    letter-spacing: 2px;
    padding: 0;
    color: var(--vermilion);
    font-weight: 600;
    opacity: 0.9;
    order: 3;
    grid-column: 2;
    grid-row: 1;
    align-self: start;
    margin-bottom: -4px;
    position: relative;
    z-index: 1;
    font-family: var(--font-title);
  }
  .timeline-node {
    order: 2;
    position: relative;
    z-index: 2;
    grid-column: 1;
    grid-row: 1;
    justify-self: center;
  }
  .timeline-node-inner {
    width: 16px;
    height: 16px;
    margin: 6px 0 0;
    border-width: 2px;
  }
  .timeline-content {
    order: 3;
    grid-column: 2;
    grid-row: 1;
    padding: 20px 18px 16px;
    margin-top: 20px;
  }
  .timeline-content::before {
    left: -8px;
    top: 14px;
    width: 14px;
    height: 14px;
  }
  .timeline-title {
    font-size: 17px;
    letter-spacing: 2px;
    margin-bottom: 4px;
  }
  .timeline-location {
    font-size: 12px;
    margin-bottom: 10px;
  }
  .timeline-desc {
    font-size: 14px;
    line-height: 1.9;
  }
  .stories-grid {
    grid-template-columns: 1fr;
  }
  .chapter-grid {
    grid-template-columns: repeat(6, 1fr);
  }
  .reading-area {
    padding: 24px 20px;
  }
  .chapter-number {
    font-size: 32px !important;
    letter-spacing: 4px !important;
  }
  .reading-toolbar {
    gap: 12px;
    padding: 10px 12px;
  }
  .toolbar-label {
    font-size: 12px;
  }
  .toolbar-btn {
    font-size: 12px;
    padding: 3px 10px;
  }
  .chujian-notice {
    padding: 8px 12px;
  }
  .chujian-notice-text {
    font-size: 12px;
  }
  .chujian-group-badge {
    font-size: 13px;
  }
  .notes-label {
    font-size: 14px;
  }
  .chujian-notes {
    font-size: 0.9em;
    padding: 12px 16px;
  }
  .fuyi-notice {
    padding: 10px 12px;
    font-size: 12px;
    line-height: 1.6;
  }
  .fuyi-notice-text {
    font-size: 12px;
  }
  .fuyi-badge {
    font-size: 12px;
  }
  .collation-trigger-btn {
    font-size: 12px;
    padding: 5px 12px;
  }
  .collation-modal-header {
    padding: 20px 20px 12px;
  }
  .collation-modal-title {
    font-size: 18px;
    letter-spacing: 4px;
  }
  .collation-modal-subtitle {
    font-size: 12px;
    letter-spacing: 1px;
  }
  .collation-modal-body {
    padding: 16px 20px;
  }
  .collation-item {
    flex-direction: column;
    gap: 8px;
    padding: 12px 0;
  }
  .collation-item-text {
    font-size: 14px;
    line-height: 1.8;
  }
  .collation-modal-footer {
    padding: 12px 20px 16px;
  }
  .reading-toolbar {
    flex-wrap: wrap;
  }
  .collation-btn-group {
    margin-left: 0;
    width: 100%;
    justify-content: flex-end;
    margin-top: 4px;
  }
}