/* ============================================================
   Zero-Perspective-Hub · 新中式美学 (Style 2)
   ------------------------------------------------------------
   字体方案 —— 完全采用 hermes-doc.aigc.green 同款:
   - Inter (Latin) — Google Fonts
   - LXGW WenKai / 霞鹜文楷 (中文) — jsdelivr CDN,@latest
   - LXGW WenKai Mono (中文代码) — jsdelivr CDN,@latest
   - JetBrains Mono (英文代码) — Google Fonts

   @latest 而非 @1.7.0:让 CDN 自动跟随包的最新版本,
   修复历史版本可能缺失的 subset 文件问题。
   ============================================================ */

/* 同 hermes-doc:直接 @import LXGW WenKai 包的 CSS,
   jsdelivr 会自动加载全部 @font-face 和 woff2 */
@import url("https://cdn.jsdelivr.net/npm/lxgw-wenkai-webfont@latest/style.css");

/* Google Fonts 加载 Inter + JetBrains Mono */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap");

/* 字体变量 —— 与 hermes-doc 中文栈保持一致 */
:root {
  /* 正文/标题:Inter(西文) → LXGW WenKai Screen → LXGW WenKai → 系统楷体 */
  --cn-font-base: "Inter", "LXGW WenKai Screen", "LXGW WenKai", "霞鹜文楷",
                   "Noto Serif SC", "Source Han Serif SC", "Songti SC",
                   -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  /* 引言/导航/印章:楷体风格(优先 LXGW WenKai,其本身就是楷体) */
  --cn-font-kai:  "LXGW WenKai", "霞鹜文楷", "STKaiti", "KaiTi", "Kaiti SC", "楷体", serif;
  /* 宋体后备(用于 h2 等正式标题) */
  --cn-font-song: "LXGW WenKai", "Noto Serif SC", "Source Han Serif SC", "Songti SC", STSong, "宋体", serif;
  /* 代码:LXGW WenKai Mono(中文) → JetBrains Mono(英文) */
  --cn-font-mono: "JetBrains Mono", "LXGW WenKai Mono", "LXGW WenKai",
                   "SFMono-Regular", Menlo, Monaco, Consolas, monospace;
}

/* ---------- 基础重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--cn-bg);
  color: var(--cn-ink);
  font-family: var(--cn-font-base);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}
::selection { background: rgba(168, 50, 29, 0.18); color: var(--cn-ink); }

a { color: var(--cn-vermilion); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--cn-gold); }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--cn-font-base);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.04em;
  color: var(--cn-ink);
  margin: 0 0 0.6em;
}

p { margin: 0 0 1.2em; }

code {
  font-family: var(--cn-font-mono);
  font-size: 0.92em;
  background: rgba(168, 50, 29, 0.08);
  padding: 0.15em 0.4em;
  border-radius: 2px;
  color: var(--cn-vermilion);
}

pre {
  font-family: var(--cn-font-mono);
}

pre code {
  font-family: var(--cn-font-mono);
  background: none;
  padding: 0;
  color: var(--cn-ink);
}

:root {
  --cn-bg:         #f3ead3;
  --cn-paper:      #f7f0d8;
  --cn-paper-light:#faf3df;
  --cn-ink:        #1c1a14;
  --cn-ink-light:  #4a4438;
  --cn-ink-faint:  #8a8270;
  --cn-vermilion:  #a8321d;
  --cn-celadon:    #7a9080;
  --cn-gold:       #b89048;
  --cn-border:     #c8b890;
  --cn-border-soft:#ddd0a8;
  --cn-shadow:     0 2px 8px rgba(60, 40, 20, 0.06), 0 8px 24px rgba(60, 40, 20, 0.04);
  --cn-shadow-hover:0 4px 12px rgba(60, 40, 20, 0.1), 0 16px 40px rgba(60, 40, 20, 0.08);
}

[data-theme="ink"] {
  /* 深色:墨韵 */
  --cn-bg:         #16140e;
  --cn-paper:      #1f1c14;
  --cn-paper-light:#2a2618;
  --cn-ink:        #e8d9a8;
  --cn-ink-light:  #b8a888;
  --cn-ink-faint:  #6a6450;
  --cn-vermilion:  #d4623e;
  --cn-celadon:    #93a888;
  --cn-gold:       #d4b050;
  --cn-border:     #3a3424;
  --cn-border-soft:#4a4430;
  --cn-shadow:     0 2px 8px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.2);
  --cn-shadow-hover:0 4px 12px rgba(0, 0, 0, 0.4), 0 16px 40px rgba(0, 0, 0, 0.3);
}

/* ---------- 移动端抽屉按钮 ---------- */
.cn-nav__drawer-toggle {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--cn-border);
  color: var(--cn-ink-light);
  cursor: pointer;
  border-radius: 2px;
  margin-right: 0.4rem;
}
.cn-nav__drawer-toggle:hover { color: var(--cn-vermilion); border-color: var(--cn-vermilion); }

/* ---------- 阅读进度条 ---------- */
.cn-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  background: var(--cn-vermilion);
  width: 0%;
  z-index: 200;
  transition: width 0.1s linear;
  pointer-events: none;
}

/* ---------- 移动端抽屉遮罩 ---------- */
.cn-drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 90;
  opacity: 0;
  transition: opacity 0.25s ease;
}
.cn-drawer-overlay.is-open {
  display: block;
  opacity: 1;
}

/* ---------- 导航 ---------- */
.cn-nav {
  background: var(--cn-bg);
  border-bottom: 1px solid var(--cn-border);
  padding: 1.4rem 0;
}
/* 首页:logo 摆在 nav 左半区(nav 横向 25% 处)水平居中。
   链接/搜索/主题按钮仍保留在原位(右半区靠右)。 */
.cn-nav.is-centered .cn-nav__inner {
  position: relative;
  justify-content: flex-end;  /* 链接/搜索靠右 */
}
.cn-nav.is-centered .cn-nav__brand {
  position: absolute;
  left: 25%;  /* nav 横向 25% = 左半区的中点 */
  top: 50%;
  transform: translate(-50%, -50%);
}
.cn-nav.is-centered .cn-nav__drawer-toggle {
  position: absolute;
  left: 1.2rem;
  top: 50%;
  transform: translateY(-50%);
}
.cn-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.cn-nav__brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--cn-ink);
  font-family: var(--cn-font-kai);
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: 0.18em;
}
.cn-nav__brand:hover { color: var(--cn-ink); }
.cn-nav__brand .logo-mark {
  width: 22px;
  height: 22px;
  color: var(--cn-vermilion);
  flex-shrink: 0;
  transition: color 0.2s ease, transform 0.3s ease;
}
.cn-nav__brand:hover .logo-mark {
  color: var(--cn-gold);
  transform: rotate(-6deg);
}
.cn-nav__brand .logo-text {
  font-family: var(--cn-font-kai);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  white-space: nowrap;
}

.cn-nav__links {
  display: flex;
  align-items: center;
  gap: 2.2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.cn-nav__links a {
  color: var(--cn-ink-light);
  font-family: var(--cn-font-kai);
  font-size: 1rem;
  letter-spacing: 0.2em;
  position: relative;
  padding-bottom: 4px;
}
.cn-nav__links a:hover { color: var(--cn-vermilion); }
.cn-nav__links a.active { color: var(--cn-vermilion); }
.cn-nav__links a.active::after {
  content: "";
  display: block;
  position: absolute;
  bottom: -8px; left: 50%;
  transform: translateX(-50%);
  width: 5px;
  height: 5px;
  background: var(--cn-vermilion);
  border-radius: 50%;
}

.cn-nav__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.cn-icon {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--cn-ink-light);
  background: transparent;
  border: 1px solid var(--cn-border);
  cursor: pointer;
  border-radius: 2px;
  font-family: var(--cn-font-kai);
  font-size: 0.95rem;
  transition: all 0.2s ease;
}
.cn-icon:hover { color: var(--cn-vermilion); border-color: var(--cn-vermilion); }

/* ---------- 搜索框(导航内) ---------- */
.cn-nav__search {
  position: relative;
  margin-right: 0.4rem;
}
.cn-search-trigger {
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--cn-border);
  color: var(--cn-ink-light);
  cursor: pointer;
  border-radius: 2px;
  font-family: var(--cn-font-kai);
  font-size: 0.95rem;
  transition: all 0.2s ease;
}
.cn-search-trigger:hover { color: var(--cn-vermilion); border-color: var(--cn-vermilion); }

/* ---------- 搜索遮罩(全屏) ---------- */
.cn-search-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(28, 26, 20, 0.85);
  backdrop-filter: blur(8px);
  z-index: 300;
  padding: 4rem 1.5rem;
  overflow-y: auto;
}
.cn-search-modal.is-open { display: block; }
.cn-search-modal__inner {
  max-width: 720px;
  margin: 0 auto;
  background: var(--cn-paper);
  border-radius: 4px;
  padding: 2rem;
  box-shadow: 0 16px 64px rgba(0,0,0,0.3);
}
.cn-search-input {
  width: 100%;
  padding: 1rem 1.2rem;
  border: 1px solid var(--cn-border);
  border-radius: 2px;
  background: var(--cn-bg);
  color: var(--cn-ink);
  font-family: var(--cn-font-base);
  font-size: 1.1rem;
  outline: none;
  transition: border-color 0.2s ease;
}
.cn-search-input:focus { border-color: var(--cn-vermilion); }
.cn-search-results {
  margin-top: 1.5rem;
  max-height: 60vh;
  overflow-y: auto;
}
.cn-search-result {
  display: block;
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--cn-border-soft);
  text-decoration: none;
  color: var(--cn-ink);
  transition: background 0.15s ease;
}
.cn-search-result:hover { background: var(--cn-bg); color: var(--cn-ink); }
.cn-search-result__title {
  font-family: var(--cn-font-kai);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}
.cn-search-result__excerpt {
  font-size: 0.9rem;
  color: var(--cn-ink-light);
  line-height: 1.5;
}
.cn-search-result mark { background: rgba(168,50,29,0.2); color: var(--cn-ink); padding: 0 2px; border-radius: 2px; }
.cn-search-empty {
  padding: 2rem;
  text-align: center;
  color: var(--cn-ink-faint);
  font-family: var(--cn-font-kai);
}

/* ---------- 章内小目录(右侧浮动) ---------- */
.cn-chapter__aside {
  position: fixed;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
  width: 180px;
  max-height: 70vh;
  overflow-y: auto;
  padding: 1rem 0;
  font-family: var(--cn-font-kai);
  font-size: 0.82rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 50;
}
.cn-chapter__aside.is-visible { opacity: 1; pointer-events: auto; }
.cn-chapter__aside__title {
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  color: var(--cn-ink-faint);
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--cn-border-soft);
  text-transform: uppercase;
}
.cn-chapter__aside ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.cn-chapter__aside li { margin: 0.3rem 0; }
.cn-chapter__aside a {
  display: block;
  padding: 0.25rem 0 0.25rem 0.8rem;
  color: var(--cn-ink-light);
  border-left: 2px solid transparent;
  text-decoration: none;
  transition: all 0.15s ease;
  line-height: 1.4;
}
.cn-chapter__aside a:hover { color: var(--cn-vermilion); }
.cn-chapter__aside a.is-active {
  color: var(--cn-vermilion);
  border-left-color: var(--cn-vermilion);
  font-weight: 600;
}
.cn-chapter__aside a.is-h3 { padding-left: 1.6rem; font-size: 0.78rem; opacity: 0.8; }

/* ---------- 索引页行(archive) ---------- */
.archive-row {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 1.2rem;
  align-items: baseline;
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--cn-border-soft);
  text-decoration: none;
  color: var(--cn-ink);
  transition: background 0.15s ease, padding 0.15s ease;
}
.archive-row:hover { background: var(--cn-paper); color: var(--cn-ink); padding-left: 0.5rem; }
.archive-date {
  color: var(--cn-ink-faint);
  font-size: 0.88rem;
  font-variant-numeric: tabular-nums;
  font-family: var(--cn-font-mono);
}
.archive-title {
  font-family: var(--cn-font-kai);
  font-size: 1rem;
  font-weight: 500;
}
.archive-tag {
  font-size: 0.78rem;
  color: var(--cn-ink-faint);
  border: 1px solid var(--cn-border);
  padding: 0.1rem 0.5rem;
  border-radius: 2px;
  font-family: var(--cn-font-kai);
}

/* ---------- Hero ---------- */
.cn-hero {
  position: relative;
  padding: 4.5rem 0 3rem;
  text-align: center;
  overflow: hidden;
}
/* 山水背景 */
.cn-hero__mountain-bg {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 300px;
  color: var(--cn-ink);
  opacity: 0.07;
  pointer-events: none;
  z-index: 0;
}
.cn-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin: 0 auto;
}
.cn-hero__eyebrow {
  font-family: var(--cn-font-kai);
  font-size: 0.95rem;
  letter-spacing: 0.5em;
  color: var(--cn-vermilion);
  margin-bottom: 1.8rem;
  text-indent: 0.5em;
  font-weight: 500;
}
.cn-hero__title {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 600;
  letter-spacing: 0.1em;
  line-height: 1.3;
  margin: 0 0 1.8rem;
  color: var(--cn-ink);
  text-indent: 0.1em;
}
.cn-hero__title .accent {
  color: var(--cn-vermilion);
  position: relative;
  display: inline-block;
}
.cn-hero__title .accent::after {
  content: "";
  position: absolute;
  bottom: 0.08em; left: 5%; right: 5%;
  height: 2px;
  background: var(--cn-vermilion);
  opacity: 0.35;
}
.cn-hero__subtitle {
  font-family: var(--cn-font-kai);
  font-size: 1.1rem;
  color: var(--cn-ink-light);
  margin-bottom: 1.5rem;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
}
.cn-hero__lead {
  max-width: 580px;
  margin: 0 auto 2.5rem;
  color: var(--cn-ink-light);
  font-size: 0.98rem;
  line-height: 2;
}

.cn-cta-row {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}
.cn-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.6rem;
  border-radius: 2px;
  font-family: var(--cn-font-kai);
  font-size: 1rem;
  letter-spacing: 0.2em;
  border: 1px solid transparent;
  transition: all 0.3s ease;
  text-indent: 0.2em;
}
.cn-cta--primary {
  background: var(--cn-ink);
  color: var(--cn-paper);
  border-color: var(--cn-ink);
}
.cn-cta--primary:hover {
  background: var(--cn-vermilion);
  border-color: var(--cn-vermilion);
  color: var(--cn-paper);
}
.cn-cta--secondary {
  background: transparent;
  color: var(--cn-ink);
  border-color: var(--cn-border);
}
.cn-cta--secondary:hover {
  border-color: var(--cn-vermilion);
  color: var(--cn-vermilion);
}

/* ---------- Section ---------- */
.cn-section {
  padding: 4.5rem 0;
  position: relative;
}
.cn-section + .cn-section { border-top: 1px dashed var(--cn-border-soft); }

.cn-section__header {
  text-align: center;
  margin-bottom: 3rem;
}
.cn-section__header h2 {
  font-size: 1.85rem;
  font-weight: 600;
  letter-spacing: 0.35em;
  margin: 0.7rem 0 0.6rem;
  text-indent: 0.35em;
}
.cn-section__header p {
  color: var(--cn-ink-light);
  font-family: var(--cn-font-kai);
  font-size: 0.95rem;
  max-width: 560px;
  margin: 0 auto;
  letter-spacing: 0.08em;
  line-height: 1.9;
}

.cn-seal-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2em;
  height: 2.2em;
  background: var(--cn-vermilion);
  color: var(--cn-paper);
  font-family: var(--cn-font-kai);
  font-size: 1.1em;
  font-weight: 600;
  border-radius: 3px;
  border: 2px solid var(--cn-vermilion);
  position: relative;
  overflow: hidden;
}
.cn-seal-mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, transparent 0%, transparent 50%, rgba(255,255,255,0.15) 100%);
  pointer-events: none;
}

/* ---------- 卡片 ---------- */
.cn-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}
/* 通用 .container 宽度限制(其它页面也能复用) */
.cn-section .container,
.cn-quotes .container,
.cn-footer .container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 2rem;
  box-sizing: border-box;
}
@media (max-width: 768px) {
  .cn-section .container,
  .cn-quotes .container,
  .cn-footer .container { padding: 0 1.2rem; }
}
/* 首页"分类结构"卡片留白:左右页边距与正文区域协调 */
.cn-section--families .cn-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  gap: 1.75rem;
  box-sizing: border-box;
}
@media (min-width: 1024px) {
  .cn-section--families .cn-grid { padding: 0 2.5rem; gap: 2rem; }
}
@media (min-width: 1280px) {
  .cn-section--families .cn-grid { padding: 0 4rem; }
}
.cn-card {
  display: block;
  background: var(--cn-paper);
  border: 1px solid var(--cn-border);
  border-radius: 2px;
  padding: 1.8rem 1.5rem;
  color: var(--cn-ink);
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--cn-shadow);
  overflow: hidden;
}
.cn-card:hover {
  border-color: var(--cn-vermilion);
  transform: translateY(-3px);
  box-shadow: var(--cn-shadow-hover);
  color: var(--cn-ink);
}
.cn-card__eyebrow {
  font-family: var(--cn-font-kai);
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  color: var(--cn-vermilion);
  margin-bottom: 0.8rem;
  text-indent: 0.3em;
  font-weight: 500;
}
.cn-card__title {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin: 0 0 0.7rem;
  line-height: 1.45;
  color: var(--cn-ink);
}
.cn-card__desc {
  color: var(--cn-ink-light);
  font-size: 0.92rem;
  line-height: 1.9;
  margin: 0 0 1.2rem;
}
.cn-card__meta {
  display: flex;
  gap: 0.8rem;
  font-family: var(--cn-font-kai);
  font-size: 0.85rem;
  color: var(--cn-ink-faint);
  align-items: center;
  letter-spacing: 0.15em;
}
.cn-card__meta time { color: var(--cn-ink-faint); }
.cn-card__tag {
  display: inline-block;
  padding: 0.1rem 0.55rem;
  border: 1px solid var(--cn-border);
  border-radius: 2px;
  font-size: 0.78rem;
  color: var(--cn-ink-light);
  background: var(--cn-paper-light);
  letter-spacing: 0.05em;
}

/* ---------- 引言 ---------- */
.cn-quotes {
  background: var(--cn-paper);
  border-top: 1px solid var(--cn-border);
  border-bottom: 1px solid var(--cn-border);
  padding: 4.5rem 0;
}
.cn-quote {
  text-align: center;
  font-size: 1.18rem;
  line-height: 2.1;
  color: var(--cn-ink);
  font-family: var(--cn-font-kai);
  max-width: 720px;
  margin: 0 auto 2.8rem;
  letter-spacing: 0.06em;
  border: none;
  padding: 0;
  font-style: normal;
}
.cn-quote:last-child { margin-bottom: 0; }
.cn-quote p { margin: 0 0 0.8rem; }
.cn-quote cite {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.88rem;
  color: var(--cn-ink-faint);
  font-style: normal;
  letter-spacing: 0.2em;
}
.cn-quote cite .seal-mini {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4em;
  height: 1.4em;
  background: var(--cn-vermilion);
  color: var(--cn-paper);
  font-size: 0.7em;
  border-radius: 2px;
  font-weight: 600;
}

/* ---------- 页脚 ---------- */
.cn-footer {
  background: var(--cn-bg);
  border-top: 1px solid var(--cn-border);
  padding: 3.5rem 0 2.5rem;
  color: var(--cn-ink-light);
  font-size: 0.9rem;
  text-align: center;
  position: relative;
}
.cn-footer__seal-big {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.4em;
  height: 3.4em;
  background: var(--cn-vermilion);
  color: var(--cn-paper);
  font-family: var(--cn-font-kai);
  font-size: 1.5em;
  font-weight: 600;
  border-radius: 4px;
  margin-bottom: 1.4rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(168, 50, 29, 0.2);
}
.cn-footer__seal-big::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 30%, transparent 0%, transparent 55%, rgba(0,0,0,0.18) 100%);
  pointer-events: none;
}

/* 新:页脚山月 logo */
.cn-footer__logo {
  width: 40px;
  height: 40px;
  color: var(--cn-vermilion);
  margin-bottom: 1rem;
  display: block;
  margin-left: auto;
  margin-right: auto;
}
.cn-footer__title {
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  color: var(--cn-ink);
  margin-bottom: 0.6rem;
  font-family: var(--cn-font-kai);
}
.cn-footer__tagline {
  color: var(--cn-ink-light);
  font-family: var(--cn-font-kai);
  font-size: 0.95rem;
  max-width: 480px;
  margin: 0 auto 1.8rem;
  letter-spacing: 0.15em;
  line-height: 1.9;
}
.cn-footer__links {
  display: flex;
  justify-content: center;
  gap: 2.2rem;
  list-style: none;
  margin: 0 0 2.2rem;
  padding: 0;
  flex-wrap: wrap;
}
.cn-footer__links a {
  color: var(--cn-ink-light);
  font-family: var(--cn-font-kai);
  letter-spacing: 0.2em;
  font-size: 0.92rem;
}
.cn-footer__links a:hover { color: var(--cn-vermilion); }
.cn-footer__bottom {
  padding-top: 1.5rem;
  border-top: 1px dashed var(--cn-border-soft);
  color: var(--cn-ink-faint);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  font-family: var(--cn-font-kai);
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .cn-nav__links { gap: 1.4rem; }
  .cn-nav__links a { font-size: 0.92rem; letter-spacing: 0.12em; }
  .cn-hero { padding: 3rem 0 2rem; }
  .cn-hero__mountain-bg { height: 200px; opacity: 0.06; }
  .cn-section { padding: 3rem 0; }
  .cn-section__header h2 { font-size: 1.5rem; letter-spacing: 0.2em; }
  .cn-grid { grid-template-columns: 1fr; }
  .cn-quote { font-size: 1.05rem; line-height: 1.95; }
  .cn-footer__links { gap: 1.4rem; }
}

@media (max-width: 480px) {
  .cn-nav__links li:nth-child(n+3) { display: none; }
  .cn-nav__brand { font-size: 1.1rem; letter-spacing: 0.12em; }
  .cn-hero__title { font-size: 1.95rem; letter-spacing: 0.06em; }
  .cn-cta-row { gap: 0.6rem; }
  .cn-cta { padding: 0.6rem 1.2rem; font-size: 0.92rem; letter-spacing: 0.12em; }
  .cn-card { padding: 1.4rem 1.2rem; }
}

/* ============================================================
   书式布局 (Book Layout)
   仿照 Docusaurus 的两栏布局:左侧固定目录 + 右侧主内容
   用于所有"书页"页面(intro / perspective / 索引 / 关于)
   ============================================================ */

.cn-book {
  display: flex;
  align-items: flex-start;
  gap: 3rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.8rem 4rem;
}

/* 左侧目录 */
.cn-toc {
  position: sticky;
  top: 80px;
  width: 240px;
  flex-shrink: 0;
  align-self: flex-start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding-right: 1rem;
  border-right: 1px solid var(--cn-border);
}
.cn-toc__title {
  font-family: var(--cn-font-kai);
  font-size: 0.85rem;
  letter-spacing: 0.35em;
  text-indent: 0.35em;
  color: var(--cn-ink-faint);
  text-transform: uppercase;
  margin-bottom: 1.2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px dashed var(--cn-border-soft);
}
.cn-toc__group {
  margin-bottom: 1.4rem;
}
.cn-toc__group-label {
  font-family: var(--cn-font-kai);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--cn-vermilion);
  margin-bottom: 0.5rem;
  padding-left: 0.4rem;
  font-weight: 500;
}
.cn-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.cn-toc__list li {
  margin: 0;
  padding: 0;
}
.cn-toc__list a {
  display: block;
  padding: 0.32rem 0 0.32rem 0.9rem;
  font-size: 0.92rem;
  color: var(--cn-ink-light);
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
  font-family: var(--cn-font-kai);
  letter-spacing: 0.05em;
  line-height: 1.5;
}
.cn-toc__list a:hover {
  color: var(--cn-vermilion);
  border-left-color: var(--cn-vermilion);
  background: var(--cn-paper);
}
.cn-toc__list a.active {
  color: var(--cn-vermilion);
  border-left-color: var(--cn-vermilion);
  font-weight: 500;
  background: var(--cn-paper);
}

/* 主内容区 */
.cn-book__main {
  flex: 1;
  min-width: 0;
  max-width: 760px;
}

/* 面包屑 */
.cn-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--cn-font-kai);
  font-size: 0.88rem;
  color: var(--cn-ink-faint);
  margin-bottom: 1.5rem;
  letter-spacing: 0.08em;
}
.cn-breadcrumb a { color: var(--cn-ink-light); }
.cn-breadcrumb a:hover { color: var(--cn-vermilion); }
.cn-breadcrumb__sep { color: var(--cn-border-strong); }
.cn-breadcrumb__current { color: var(--cn-ink); }

/* 章首元信息(序/视角/方法) */
.cn-chapter-meta {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  font-family: var(--cn-font-kai);
  font-size: 0.85rem;
  color: var(--cn-ink-faint);
  letter-spacing: 0.15em;
  margin-bottom: 0.8rem;
}
.cn-chapter-meta__seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6em;
  height: 1.6em;
  background: var(--cn-vermilion);
  color: var(--cn-paper);
  font-size: 0.85em;
  font-weight: 600;
  border-radius: 2px;
  font-family: var(--cn-font-kai);
}
.cn-chapter-meta__vol {
  color: var(--cn-vermilion);
  font-weight: 500;
  letter-spacing: 0.2em;
}
.cn-chapter-meta__sep { color: var(--cn-border-strong); }

/* 章标题 */
.cn-chapter__title {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.25;
  margin: 0 0 0.6rem;
  color: var(--cn-ink);
}
.cn-chapter__subtitle {
  font-family: var(--cn-font-kai);
  font-size: 1.05rem;
  color: var(--cn-ink-light);
  letter-spacing: 0.15em;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--cn-border);
}
.cn-chapter__meta {
  display: flex;
  gap: 1rem;
  font-family: var(--cn-font-kai);
  font-size: 0.85rem;
  color: var(--cn-ink-faint);
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
.cn-chapter__meta .tag {
  display: inline-block;
  padding: 0.1rem 0.55rem;
  border: 1px solid var(--cn-border);
  border-radius: 2px;
  font-size: 0.78rem;
  color: var(--cn-ink-light);
  background: var(--cn-paper);
  letter-spacing: 0.05em;
}

/* 章正文 */
.cn-chapter__body {
  font-size: 1.05rem;
  line-height: 2;
  color: var(--cn-ink);
  letter-spacing: 0.03em;
}
.cn-chapter__body > * + * { margin-top: 1.2rem; }
.cn-chapter__body h2 {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--cn-border-soft);
  color: var(--cn-ink);
  position: relative;
}
.cn-chapter__body h2 .num {
  color: var(--cn-vermilion);
  font-family: var(--cn-font-kai);
  margin-right: 0.6rem;
  font-weight: 500;
}
.cn-chapter__body h3 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  margin: 1.8rem 0 0.6rem;
  color: var(--cn-ink);
}
.cn-chapter__body p { margin: 0; }
.cn-chapter__body ul,
.cn-chapter__body ol { margin: 0; padding-left: 1.6rem; }
.cn-chapter__body li { margin-bottom: 0.5rem; }
.cn-chapter__body blockquote {
  border-left: 3px solid var(--cn-vermilion);
  background: var(--cn-paper);
  padding: 0.8em 1.2em;
  margin: 0;
  font-style: normal;
  color: var(--cn-ink-light);
  border-radius: 0 4px 4px 0;
  font-family: var(--cn-font-kai);
}
.cn-chapter__body pre {
  background: var(--cn-paper);
  border: 1px solid var(--cn-border);
  padding: 1em 1.2em;
  border-radius: 2px;
  overflow-x: auto;
  font-size: 0.9em;
  line-height: 1.55;
}
.cn-chapter__body pre code { background: none; padding: 0; color: var(--cn-ink); }
/* ASCII 结构图:严格等宽 + 紧凑行距,保证 box-drawing 字符对齐 */
.cn-chapter__body pre.cn-ascii-art {
  font-family: "JetBrains Mono", "SF Mono", "Cascadia Mono", Consolas, "Courier New", monospace;
  font-size: 0.82em;
  line-height: 1.35;
  letter-spacing: 0;
  white-space: pre;
  color: var(--cn-ink);
  background: var(--cn-paper-soft, #f6f1e7);
  border-left: 3px solid var(--cn-vermilion, #a93226);
  padding: 1.1em 1.4em;
}
.cn-chapter__body code {
  font-family: "SF Mono", "JetBrains Mono", Consolas, monospace;
  font-size: 0.92em;
  background: rgba(168, 50, 29, 0.08);
  padding: 0.15em 0.4em;
  border-radius: 2px;
  color: var(--cn-vermilion);
}
.cn-chapter__body hr {
  border: 0;
  height: 1px;
  background: var(--cn-border-soft);
  margin: 2rem auto;
  width: 60%;
  position: relative;
}
.cn-chapter__body hr::before {
  content: "❀";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--cn-bg);
  color: var(--cn-vermilion);
  padding: 0 0.8rem;
  font-size: 0.9rem;
}

/* 章末导航(上一篇/下一篇) */
.cn-chapter-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--cn-border);
}
.cn-chapter-nav a {
  display: flex;
  flex-direction: column;
  padding: 0.8rem 1rem;
  border: 1px solid var(--cn-border);
  border-radius: 2px;
  background: var(--cn-paper);
  color: var(--cn-ink-light);
  flex: 1;
  min-width: 0;
  transition: all 0.2s ease;
  font-family: var(--cn-font-kai);
  text-decoration: none;
}
.cn-chapter-nav a:hover {
  border-color: var(--cn-vermilion);
  color: var(--cn-vermilion);
  background: var(--cn-paper-light);
}
.cn-chapter-nav .label {
  font-size: 0.78rem;
  color: var(--cn-ink-faint);
  letter-spacing: 0.2em;
  margin-bottom: 0.3rem;
}
.cn-chapter-nav .title {
  font-size: 0.98rem;
  font-weight: 500;
  color: inherit;
  letter-spacing: 0.05em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cn-chapter-nav .next { text-align: right; }
.cn-chapter-nav .prev .label::before { content: "← "; }
.cn-chapter-nav .next .label::after { content: " →"; }

/* 章末元信息(编辑此页 / 报告问题 等链接) */
.cn-chapter-edit {
  margin-top: 2rem;
  padding: 1rem 0;
  border-top: 1px dashed var(--cn-border-soft);
  display: flex;
  gap: 1.5rem;
  font-family: var(--cn-font-kai);
  font-size: 0.85rem;
  color: var(--cn-ink-faint);
  letter-spacing: 0.1em;
  flex-wrap: wrap;
}
.cn-chapter-edit a {
  color: var(--cn-ink-light);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.cn-chapter-edit a:hover { color: var(--cn-vermilion); }

/* 序/前言/后记 等特殊页面 */
.cn-prose {
  max-width: 680px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 2;
  color: var(--cn-ink);
  letter-spacing: 0.03em;
  font-family: var(--cn-font-kai);
}
.cn-prose > * + * { margin-top: 1.4rem; }
.cn-prose h2 {
  font-family: var(--cn-font-song);
  font-size: 1.3rem;
  font-weight: 600;
  margin: 2.2rem 0 0.8rem;
  color: var(--cn-ink);
  letter-spacing: 0.08em;
}
.cn-prose p { margin: 0; }
.cn-prose blockquote {
  border-left: 3px solid var(--cn-vermilion);
  background: var(--cn-paper);
  padding: 0.8em 1.2em;
  margin: 0;
  font-style: normal;
  color: var(--cn-ink-light);
  border-radius: 0 4px 4px 0;
}

/* 书式响应式 */
@media (max-width: 996px) {
  .cn-book {
    flex-direction: column;
    gap: 1.5rem;
    padding: 1.5rem 1.5rem 3rem;
  }
  .cn-toc {
    position: static;
    width: 100%;
    max-height: none;
    border-right: 0;
    border-bottom: 1px solid var(--cn-border);
    padding: 0 0 1.5rem;
    margin-bottom: 1rem;
  }
  .cn-toc__group { margin-bottom: 1rem; }
  .cn-toc__list { columns: 2; column-gap: 1.5rem; }
  .cn-toc__list a { padding: 0.25rem 0 0.25rem 0.6rem; font-size: 0.88rem; }
}
@media (max-width: 480px) {
  .cn-toc__list { columns: 1; }
  .cn-chapter-nav { flex-direction: column; }
  .cn-chapter-nav .next { text-align: left; }
}

/* ---------- 移动端抽屉菜单(<= 768px) ---------- */
@media (max-width: 768px) {
  .cn-nav__drawer-toggle { display: inline-flex; }
  .cn-nav__links {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    background: var(--cn-paper);
    padding: 2rem 1.5rem;
    gap: 1.5rem;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 95;
    overflow-y: auto;
    border-top: 1px solid var(--cn-border);
  }
  .cn-nav__links.is-open { transform: translateX(0); }
  .cn-nav__links a { font-size: 1.1rem; }
  .cn-nav__links li:nth-child(n+4) { display: list-item; }  /* 显示所有链接 */
  .cn-chapter__aside { display: none; }  /* 移动端不显示章内 TOC */
}

/* ============================================================
   打印样式 —— 让站点的「书」可以直接打印
   ============================================================ */
@media print {
  /* 基础:白底黑字,小字号,衬线字体 */
  :root, [data-theme="ink"] {
    --cn-bg: #ffffff;
    --cn-paper: #ffffff;
    --cn-paper-light: #f5f5f5;
    --cn-ink: #000000;
    --cn-ink-light: #333333;
    --cn-ink-faint: #666666;
    --cn-vermilion: #000000;
    --cn-border: #cccccc;
    --cn-border-soft: #dddddd;
    --cn-shadow: none;
    --cn-shadow-hover: none;
  }
  body {
    background: #fff !important;
    color: #000 !important;
    font-size: 11pt;
    line-height: 1.6;
  }
  /* 隐藏交互元素 */
  .cn-nav__drawer-toggle,
  .cn-nav__search,
  .cn-progress,
  .cn-chapter__aside,
  .cn-chapter-edit,
  .cn-style-banner,
  nav.cn-nav,
  .cn-search-modal,
  .cn-footer__links,
  .cn-footer__bottom > div:last-child {
    display: none !important;
  }
  /* 简化导航(只保留品牌文字作为标题) */
  .cn-nav {
    border-bottom: 1px solid #000;
    padding: 0.5cm 0;
  }
  .cn-nav__links { display: none !important; }
  /* 侧栏目录(TOC)移到主内容顶部 */
  .cn-book { display: block; }
  .cn-toc {
    position: static;
    width: 100%;
    max-height: none;
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid #999;
    padding: 0.5cm 0;
    margin-bottom: 0.5cm;
    page-break-after: avoid;
  }
  .cn-toc__title {
    font-size: 14pt;
    font-weight: 700;
    margin-bottom: 0.3cm;
  }
  .cn-toc__group { margin-bottom: 0.3cm; }
  .cn-toc__group-label {
    font-size: 10pt;
    font-weight: 600;
    color: #000;
  }
  .cn-toc__list { columns: 2; column-gap: 1cm; }
  .cn-toc__list a {
    color: #000 !important;
    font-size: 10pt;
    padding: 0.1cm 0;
    border-left: none !important;
    background: none !important;
  }
  /* 主内容区 */
  .cn-book__main {
    max-width: 100%;
    padding: 0;
  }
  .cn-book {
    padding: 0;
  }
  .cn-breadcrumb { display: none; }  /* 打印时不需要面包屑 */
  article {
    page-break-before: always;
  }
  article:first-of-type { page-break-before: auto; }
  .cn-chapter__title { font-size: 22pt; }
  .cn-chapter__subtitle { font-size: 13pt; }
  .cn-chapter__meta .tag { border: 1px solid #999; }
  .cn-chapter__body {
    font-size: 11pt;
    line-height: 1.7;
    color: #000;
  }
  .cn-chapter__body h2 {
    font-size: 14pt;
    margin-top: 1cm;
    page-break-after: avoid;
  }
  .cn-chapter__body h3 {
    font-size: 12pt;
    page-break-after: avoid;
  }
  .cn-chapter__body blockquote {
    border-left: 2pt solid #000;
    background: #f5f5f5;
    color: #000;
  }
  .cn-chapter__body pre {
    background: #f5f5f5;
    color: #000;
    border: 1px solid #999;
    font-size: 9pt;
    page-break-inside: avoid;
  }
  /* 链接:显示 URL 但不显示颜色 */
  a {
    color: #000 !important;
    text-decoration: underline;
  }
  a[href^="http"]:after {
    content: " (" attr(href) ")";
    font-size: 9pt;
    color: #555;
    word-break: break-all;
  }
  /* 内部链接不加 URL */
  a[href^="#"]:after,
  a[href^="/"]:after,
  a[href^="../"]:after,
  a[href^="./"]:after {
    content: "";
  }
  /* 章节导航显示 */
  .cn-chapter-nav { display: flex !important; border-top: 1px solid #999; padding-top: 0.5cm; }
  /* 页脚简化 */
  .cn-footer { border-top: 1px solid #999; padding: 0.5cm 0; }
  .cn-footer__bottom { text-align: center; font-size: 9pt; color: #555; }
  /* 分页:每个 chapter 起新页 */
  .cn-toc, .cn-breadcrumb, .cn-progress, .cn-chapter-edit { page-break-after: avoid; }
  article { page-break-before: always; }
  .cn-footer { page-break-before: always; }
}

/* ============================================================
   滚动条微调(让滚动更"中式")
   ============================================================ */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--cn-border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--cn-vermilion); }


/* ============================================================
   筹备中占位章节
   ============================================================ */
.cn-coming-soon {
  text-align: center;
  padding: 5rem 2rem 4rem;
  max-width: 540px;
  margin: 0 auto;
}
.cn-coming-soon__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 1.5rem;
  display: block;
  color: var(--cn-vermilion, #a8321d);
  opacity: 0.65;
  animation: cn-coming-soon-spin 8s linear infinite;
}
@keyframes cn-coming-soon-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}
.cn-coming-soon__title {
  font-family: var(--cn-font-serif, "Noto Serif SC", "Source Han Serif SC", serif);
  font-size: 1.5rem;
  color: var(--cn-ink, #2a2520);
  margin: 0 0 1rem;
  font-weight: 500;
  letter-spacing: 0.05em;
}
.cn-coming-soon__desc {
  color: var(--cn-ink-faint, #6a6058);
  font-size: 1rem;
  line-height: 1.9;
  margin: 0 0 2rem;
}
.cn-coming-soon__desc a {
  color: var(--cn-vermilion, #a8321d);
  text-decoration: none;
  border-bottom: 1px dotted currentColor;
}
.cn-coming-soon__desc a:hover {
  border-bottom-style: solid;
}
.cn-coming-soon__cta {
  margin-top: 1.5rem;
}