/* ==========================================================================
   引路人 014 · 黄峥 —— 全站基础样式
   hub 陶土语言：accent #b85d3d / bg #fbf6ef / serif 标题 / 印章「峥」。
   :root 里的 --l1…--l5 是与 graph.css · reader.css · search.css 共享的契约，
   变量名不可改（那三份文件用 var(--l1, fallback) 引用）。
   ========================================================================== */

:root {
  --bg: #fbf6ef;
  --bg-card: #fffdf9;
  --bg-sunk: #f6eee1;
  --sidebar-bg: #f5ebd9;
  --ink: #33291f;
  --ink-soft: #6b5b48;
  --ink-light: #7d6a55;          /* AA on --bg (4.8:1) */
  --accent: #b85d3d;
  --accent-dark: #8f3f2b;        /* 正文链接用这个，AA 6.7:1 */
  --accent-light: #f8e9e1;
  --border: #e6d9c7;
  --border-strong: #d4c4ad;

  --l1: #7d3829;
  --l2: #b85d3d;
  --l3: #b07a45;
  --l4: #786a4e;
  --l5: #4f6350;
  --person: #4b5b6e;
  --topic: #6f4e66;

  --sidebar-w: 272px;
  --measure: 36em;
  --radius: 4px;

  --serif: Georgia, "Times New Roman", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "PingFang SC", monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 700; letter-spacing: -.012em; line-height: 1.28; }
a { color: inherit; }
img, svg { max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
code, pre { font-family: var(--mono); }

:focus-visible {
  outline: 2px solid var(--accent-dark);
  outline-offset: 2px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

.skip-link {
  position: fixed; top: 8px; left: 8px; z-index: 60;
  padding: 10px 16px; border: 1px solid var(--accent);
  background: var(--bg-card); color: var(--accent-dark);
  font-size: 14px; text-decoration: none;
  transform: translateY(-200%);
}
.skip-link:focus { transform: translateY(0); }

/* ------------------------------------------------------------------ 侧栏 */

.sidebar {
  position: fixed; inset: 0 auto 0 0; z-index: 30;
  width: var(--sidebar-w); overflow-y: auto;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-strong);
  overscroll-behavior: contain;
}
.sidebar-inner { padding: 22px 18px 28px; }

.brand { display: flex; align-items: center; gap: 10px; padding-bottom: 16px; border-bottom: 1px solid var(--border-strong); text-decoration: none; }
.brand-dot {
  flex: 0 0 auto; display: grid; place-items: center;
  width: 36px; height: 36px; border-radius: 3px;
  background: var(--accent); color: #fff;
  font-family: var(--serif); font-size: 20px; font-weight: 700;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.28);
}
.brand strong { display: block; font-family: var(--serif); font-size: 17px; }
.brand em { display: block; color: var(--ink-light); font-size: 11px; font-style: normal; letter-spacing: .08em; }

.nav { display: flex; flex-direction: column; margin: 14px 0 6px; }
.nav-item {
  display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap;
  min-height: 44px; padding: 10px 10px;
  border-left: 2px solid transparent; border-radius: 0 var(--radius) var(--radius) 0;
  text-decoration: none; transition: background .15s ease, border-color .15s ease;
}
.nav-item:hover { background: rgba(184, 93, 61, .09); }
.nav-item.is-on { border-left-color: var(--accent); background: var(--accent-light); }
.nav-label { font-size: 15px; font-weight: 600; }
.nav-item.is-on .nav-label { color: var(--accent-dark); }
.nav-hint { color: var(--ink-light); font-size: 11px; }
.nav-sub { display: flex; flex-direction: column; margin: 0 0 6px 12px; padding-left: 10px; border-left: 1px dotted var(--border-strong); }
.nav-sub a { min-height: 32px; padding: 6px 8px; color: var(--ink-soft); font-size: 12.5px; text-decoration: none; }
.nav-sub a:hover { color: var(--accent-dark); }

.rail { margin: 16px 0 4px; padding-top: 14px; border-top: 1px solid var(--border-strong); }
.rail-title { margin: 0 0 6px 10px; color: var(--ink-light); font-size: 11px; letter-spacing: .18em; }
.rail-item { display: flex; align-items: center; gap: 8px; min-height: 34px; padding: 5px 10px; border-radius: var(--radius); text-decoration: none; }
.rail-item:hover { background: rgba(184, 93, 61, .09); }
.rail-item[aria-current] { background: var(--accent-light); }
.rail-dot { flex: 0 0 auto; width: 9px; height: 9px; border-radius: 50%; background: var(--accent); }
.rail-name { flex: 1; font-size: 13px; }
.rail-count { color: var(--ink-light); font-family: var(--serif); font-size: 12px; }
.rail-item.l1 .rail-dot { background: var(--l1); }
.rail-item.l2 .rail-dot { background: var(--l2); }
.rail-item.l3 .rail-dot { background: var(--l3); }
.rail-item.l4 .rail-dot { background: var(--l4); }
.rail-item.l5 .rail-dot { background: var(--l5); }

.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 10px; margin: 18px 0 0; padding-top: 14px; border-top: 1px solid var(--border-strong); }
.stats div { min-width: 0; }
.stats dt { color: var(--ink-light); font-size: 11px; }
.stats dd { margin: 0; font-family: var(--serif); font-size: 19px; line-height: 1.2; }
.stats dd small { font-family: var(--sans); font-size: 10px; color: var(--ink-light); }

.back-hub { display: block; margin-top: 20px; padding-top: 14px; border-top: 1px solid var(--border-strong); color: var(--accent-dark); font-size: 12px; text-decoration: none; }
.back-hub:hover { text-decoration: underline; }

.mobile-menu-btn { display: none; }
.scrim { display: none; }

/* 旧 markup 的兼容兜底（read/search 的 data-layout-fallback 侧栏在 build 期会被删掉，
   这里只是防止未注入时页面完全失样）。 */
.tabs { display: flex; gap: 4px; margin: 14px 0; }
.tab { flex: 1; padding: 7px 10px; border-radius: var(--radius); color: var(--ink-soft); font-size: 13px; text-align: center; text-decoration: none; }
.tab.active { background: var(--accent); color: #fff; }
.toc { font-size: 13px; }
.toc-title { padding: 6px 4px; font-size: 13px; font-weight: 600; }
.toc-items { display: flex; flex-direction: column; gap: 2px; }
.toc-item { padding: 4px 6px; color: var(--ink-soft); font-size: 12px; text-decoration: none; }

/* -------------------------------------------------------------- 主内容区 */

.main {
  max-width: 1180px; min-height: 100vh;
  margin-left: var(--sidebar-w);
  padding: 46px 56px 80px;
}
.kicker { margin: 0 0 12px; color: var(--accent-dark); font-size: 11px; font-weight: 700; letter-spacing: .24em; text-transform: uppercase; }

.page-head { max-width: 46em; padding-bottom: 26px; margin-bottom: 8px; border-bottom: 1px solid var(--border-strong); }
.page-head h1 { margin: 0; font-size: clamp(30px, 4.4vw, 50px); }
.node-lede { max-width: var(--measure); margin: 14px 0 0; color: var(--ink-soft); font-size: 17px; }

.crumbs { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 0 0 14px; color: var(--ink-light); font-size: 12px; }
.crumbs a { color: var(--ink-light); text-decoration: none; }
.crumbs a:hover { color: var(--accent-dark); text-decoration: underline; }

.button {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 10px 18px;
  border: 1px solid var(--border-strong); border-radius: var(--radius);
  background: var(--bg-card); color: var(--ink);
  font-size: 14px; text-decoration: none;
  transition: border-color .15s ease, background .15s ease;
}
.button:hover { border-color: var(--accent); color: var(--accent-dark); }
.button.primary { border-color: var(--accent); background: var(--accent); color: #fff; }
.button.primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.button .hl-count { color: inherit; opacity: .72; font-size: 12px; }

/* ------------------------------------------------------------ 通用板块 */

.nx { max-width: 46em; margin: 0; padding: 34px 0; border-bottom: 1px solid var(--border); }
.nx > h2, .nx > summary h2 { margin: 0 0 14px; font-size: clamp(19px, 2.4vw, 25px); }
.nx-count { margin-left: 10px; color: var(--ink-light); font-family: var(--sans); font-size: 12px; font-weight: 400; letter-spacing: .04em; }
.nx-lede { max-width: var(--measure); margin: 0 0 18px; color: var(--ink-light); font-size: 13.5px; }
.nx-text { max-width: var(--measure); color: var(--ink-soft); }

/* C/D 级材料区：标题不能是第一人称，视觉上也必须和「他自己的话」明显分开（交接文档 §6 红线）。 */
.nx-relayed > h2 { color: var(--ink-light); font-size: clamp(17px, 2vw, 21px); }
.nx-relayed > .nx-lede { padding-left: 12px; border-left: 3px solid var(--border-strong); color: var(--ink-soft); }
.nx-relayed .quote blockquote { opacity: .88; }

.nx-fold { padding: 0; border-bottom: 1px solid var(--border); }
.nx-fold > summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 34px 0 0; cursor: pointer; list-style: none; }
.nx-fold > summary::-webkit-details-marker { display: none; }
.nx-fold > summary h2 { margin: 0 0 14px; }
.fold-hint { flex: 0 0 auto; width: 28px; height: 28px; margin-bottom: 12px; border: 1px solid var(--border-strong); border-radius: 50%; position: relative; }
.fold-hint::before, .fold-hint::after { content: ''; position: absolute; inset: 50% 7px auto; height: 1px; background: var(--ink-soft); }
.fold-hint::after { transform: rotate(90deg); transition: transform .15s ease; }
.nx-fold[open] .fold-hint::after { transform: rotate(0deg); }
.fold-body { padding-bottom: 34px; }
.nx-fold:not([open]) > summary { padding-bottom: 30px; }

/* -------------------------------------------------------------- 正文排版 */

.prose { max-width: var(--measure); color: var(--ink); }
.prose p { margin: 0 0 1.15em; }
.prose h2 { margin: 2em 0 .7em; font-size: 23px; }
.prose h3 { margin: 1.8em 0 .6em; font-size: 19px; }
.prose h4 { margin: 1.6em 0 .5em; font-size: 16.5px; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.5em; }
.prose li { margin: .4em 0; }
.prose hr { margin: 2.4em 0; border: 0; border-top: 1px solid var(--border-strong); }
.prose code { padding: 1px 5px; border-radius: 3px; background: var(--bg-sunk); font-size: .88em; }
.prose a { color: var(--accent-dark); text-underline-offset: 3px; text-decoration-thickness: 1px; }
.prose a:hover { text-decoration-thickness: 2px; }
.prose-long { font-size: 17px; line-height: 1.86; }
.prose-long p { margin: 0 0 1.3em; }

.prose a.x-node { padding: 1px 5px; border-radius: 3px; background: var(--accent-light); color: var(--accent-dark); text-decoration: none; box-decoration-break: clone; }
.prose a.x-node:hover { background: var(--accent); color: #fff; }
.prose a.x-person { background: #e6ebf1; color: #3a4a5c; }
.prose a.x-person:hover { background: var(--person); color: #fff; }
.prose a.x-topic { background: #efe4ec; color: #5d3f55; }
.prose a.x-topic:hover { background: var(--topic); color: #fff; }
.prose a.x-chapter { color: var(--l5); text-decoration-style: dotted; }
.prose a.x-missing { color: #a64b3a; text-decoration: line-through; }

.cite-chip {
  display: inline; padding: 1px 6px; border-radius: 3px;
  background: var(--bg-sunk); color: var(--ink-light);
  font-family: var(--sans); font-size: .8em; word-break: break-word;
}
.infer-mark { color: var(--accent-dark); font-size: .88em; }

.pull-quote { margin: 1.6em 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--accent); }
.pull-quote blockquote { margin: 0; }
.pull-quote p { margin: 0 0 .6em; color: var(--ink); font-family: var(--serif); font-size: 1.02em; }
.pull-quote figcaption { color: var(--ink-light); font-size: 12.5px; }

.table-wrap { overflow-x: auto; margin: 1.6em 0; }
.prose table { width: 100%; border-collapse: collapse; font-size: 14px; }
.prose th, .prose td { padding: 9px 12px; border: 1px solid var(--border); text-align: left; vertical-align: top; }
.prose th { background: var(--bg-sunk); font-weight: 600; white-space: nowrap; }

/* ------------------------------------------------------------------ 徽章 */

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 9px; border: 1px solid var(--border-strong); border-radius: 99px;
  color: var(--ink-soft); font-size: 11.5px; white-space: nowrap;
}
.badge-layer { border-color: transparent; color: #fff; }
.badge-layer.l1 { background: var(--l1); }
.badge-layer.l2 { background: var(--l2); }
.badge-layer.l3 { background: var(--l3); }
.badge-layer.l4 { background: var(--l4); }
.badge-layer.l5 { background: var(--l5); }
.badge-kind { background: var(--bg-sunk); }
.badge-tag { color: var(--ink-light); }
.node-meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 18px 0 0; }

.tier {
  display: inline-grid; place-items: center;
  width: 20px; height: 20px; border-radius: 3px;
  color: #fff; font-family: var(--serif); font-size: 12px; font-weight: 700;
}
.tier-a { background: #2f6b4f; }
.tier-b { background: #3f5d80; }
.tier-c { background: #a06a22; }
.tier-d { background: #7a6a5c; }
.tier-x { background: #9a3b2c; }
.tier-label { color: var(--ink-light); font-size: 11.5px; }

/* ------------------------------------------------------------------ 引文 */

.quote { margin: 0 0 22px; padding: 20px 22px; border: 1px solid var(--border); border-left: 3px solid var(--border-strong); background: var(--bg-card); }
.quote[data-tier="A"] { border-left-color: #2f6b4f; }
.quote[data-tier="B"] { border-left-color: #3f5d80; }
.quote[data-tier="C"] { border-left-color: #a06a22; }
.quote[data-tier="D"] { border-left-color: #7a6a5c; }
.quote blockquote { margin: 0; }
.quote blockquote p { margin: 0; font-family: var(--serif); font-size: 17px; line-height: 1.78; }
.quote figcaption { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 14px; padding-top: 12px; border-top: 1px dashed var(--border); font-size: 12.5px; }
.q-src a { color: var(--accent-dark); text-decoration: none; }
.q-src a:hover { text-decoration: underline; }
.q-meta { color: var(--ink-light); }
.q-ext { margin-left: auto; color: var(--ink-light); text-decoration: none; }
.q-ext:hover { color: var(--accent-dark); }
.q-warn { margin: 12px 0 0; padding: 8px 11px; border-radius: var(--radius); background: #fdf2df; color: #7a4f12; font-size: 12.5px; }

/* ---------------------------------------------------------------- 节点页 */

.node, .topic, .layer-page, .path, .sources, .home, .notfound, .source { max-width: 100%; }
.node-head { padding: 0 0 26px; border-bottom: 3px solid var(--accent); }
.node-head.l1 { border-bottom-color: var(--l1); }
.node-head.l2 { border-bottom-color: var(--l2); }
.node-head.l3 { border-bottom-color: var(--l3); }
.node-head.l4 { border-bottom-color: var(--l4); }
.node-head.l5 { border-bottom-color: var(--l5); }
.node-head h1 { margin: 0; font-size: clamp(30px, 4.6vw, 52px); }

.analogy-card { max-width: var(--measure); padding: 20px 22px; border-left: 3px solid var(--accent); background: var(--accent-light); }
.analogy-card p { margin: 0; font-size: 16px; }
.lesson-card { max-width: var(--measure); padding: 18px 20px; border-left: 3px solid var(--l5); background: #eef1ea; }
.lesson-card p { margin: 0; }

.core-list { max-width: var(--measure); margin: 0; padding: 0; list-style: none; }
.core-item { display: grid; grid-template-columns: 40px 1fr; gap: 14px; padding: 0 0 22px; }
.core-item + .core-item { padding-top: 22px; border-top: 1px solid var(--border); }
.core-num { color: var(--accent); font-family: var(--serif); font-size: 17px; }
.core-item h3 { margin: 0 0 8px; font-size: 17px; }
.core-item p { margin: 0; color: var(--ink-soft); font-size: 15px; }

.mis-list { max-width: var(--measure); margin: 0; padding: 0; list-style: none; }
.mis-item { padding: 16px 0; }
.mis-item + .mis-item { border-top: 1px solid var(--border); }
.mis-item p { margin: 0 0 10px; }
.mis-item p:last-child { margin-bottom: 0; }
.mis-tag { display: inline-block; margin-right: 8px; padding: 1px 8px; border-radius: 3px; font-size: 11.5px; vertical-align: 1px; }
.mis-tag-x { background: #f6e2dd; color: #8f3f2b; }
.mis-tag-o { background: #e2efe6; color: #2f6b4f; }
.mis-wrong { color: var(--ink-light); text-decoration-color: var(--border-strong); }
.mis-right { color: var(--ink); }

.case-list { max-width: var(--measure); display: grid; gap: 16px; }
.case-item { padding: 20px 22px; border: 1px solid var(--border); background: var(--bg-card); }
.case-item h3 { margin: 0 0 8px; font-size: 17px; }
.case-item p { margin: 0; color: var(--ink-soft); font-size: 15px; }

.qa-list { max-width: var(--measure); display: grid; gap: 20px; }
.qa-item { padding-left: 4px; }
.qa-q, .qa-a { display: grid; grid-template-columns: 26px 1fr; gap: 10px; margin: 0 0 10px; }
.qa-q span, .qa-a span { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 3px; font-family: var(--serif); font-size: 12px; }
.qa-q span { background: var(--accent); color: #fff; }
.qa-a span { background: var(--bg-sunk); color: var(--ink-soft); }
.qa-q { font-weight: 600; }
.qa-a { color: var(--ink-soft); }

.do-list { max-width: var(--measure); margin: 0; padding: 0; list-style: none; }
.do-list li { position: relative; margin: 0 0 12px; padding-left: 24px; color: var(--ink-soft); }
.do-list li::before { content: '→'; position: absolute; left: 0; color: var(--accent); }

.fact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; max-width: var(--measure); margin: 0; }
.fact-grid div { padding: 14px 16px; border: 1px solid var(--border); background: var(--bg-card); }
.fact-grid dt { color: var(--ink-light); font-size: 11px; letter-spacing: .1em; }
.fact-grid dd { margin: 4px 0 0; font-size: 15px; }

.timeline { max-width: var(--measure); margin: 0; padding: 0; list-style: none; }
.timeline li { display: grid; grid-template-columns: 92px 1fr; gap: 16px; padding: 12px 0; border-top: 1px solid var(--border); }
.timeline li:first-child { border-top: 0; }
.tl-year { color: var(--accent-dark); font-family: var(--serif); font-size: 14px; }
.tl-event { color: var(--ink-soft); font-size: 15px; }
.tl-event a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--border-strong); }
.tl-event a:hover { color: var(--accent-dark); border-bottom-color: var(--accent); }
.tl-event em { display: block; margin-top: 3px; color: var(--ink-light); font-size: 13px; font-style: normal; }
.timeline-lg li { padding: 16px 0; }

/* ------------------------------------------------------------ chips / 关联 */

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex; align-items: center; gap: 7px;
  min-height: 34px; padding: 6px 12px;
  border: 1px solid var(--border-strong); border-radius: 99px;
  background: var(--bg-card); font-size: 13.5px; text-decoration: none;
  transition: border-color .15s ease, background .15s ease;
}
.chip:hover { border-color: var(--accent); background: var(--accent-light); color: var(--accent-dark); }
.chip-dot { flex: 0 0 auto; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.chip-dot.l1 { background: var(--l1); }
.chip-dot.l2 { background: var(--l2); }
.chip-dot.l3 { background: var(--l3); }
.chip-dot.l4 { background: var(--l4); }
.chip-dot.l5 { background: var(--l5); }
.chip-person { border-style: dashed; }
.chip-topic { background: #f7f1f5; }
.chip-chapter { background: var(--bg-sunk); }

.rel-groups { display: grid; gap: 22px; max-width: var(--measure); }
.rel-group h3 { margin: 0 0 10px; color: var(--ink-light); font-family: var(--sans); font-size: 12px; font-weight: 600; letter-spacing: .1em; }

/* -------------------------------------------------------------- 深读灵魂 */

.deep-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; max-width: 62em; }
.deep-item {
  display: flex; flex-direction: column; gap: 6px;
  padding: 16px 18px; border: 1px solid var(--border); border-top: 3px solid var(--l5);
  background: var(--bg-card); text-decoration: none;
  transition: border-color .15s ease;
}
.deep-item:hover { border-color: var(--accent); }
.deep-item.rel-contradicts { border-top-color: #9a3b2c; }
.deep-item.rel-exemplifies { border-top-color: var(--l3); }
.deep-doc { color: var(--ink-light); font-size: 11px; letter-spacing: .1em; }
.deep-title { font-family: var(--serif); font-size: 16px; line-height: 1.4; }
.deep-rel { align-self: flex-start; padding: 1px 8px; border-radius: 99px; background: var(--bg-sunk); color: var(--ink-soft); font-size: 11px; }
.deep-excerpt { color: var(--ink-light); font-size: 12.5px; }

/* ------------------------------------------------------------------ 来源 */

.src-list { max-width: var(--measure); margin: 0; padding: 0; list-style: none; }
.src-list li { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; padding: 10px 0; border-bottom: 1px dashed var(--border); font-size: 14px; }
.src-list a { color: var(--accent-dark); text-decoration: none; }
.src-list a:hover { text-decoration: underline; }
.src-list span { color: var(--ink-light); font-size: 12px; }

.src-filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 8px; }
.src-filter { display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 6px 14px; border: 1px solid var(--border-strong); border-radius: 99px; color: var(--ink-soft); font-size: 13px; text-decoration: none; }
.src-filter:hover, .src-filter.is-on { border-color: var(--accent); background: var(--accent-light); color: var(--accent-dark); }
.src-filter em { color: var(--ink-light); font-size: 11px; font-style: normal; }

.src-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 12px; margin: 0; padding: 0; list-style: none; max-width: 72em; }
.src-card { display: flex; flex-direction: column; border: 1px solid var(--border); background: var(--bg-card); }
.src-card.is-orphan { border-style: dashed; background: transparent; }
.src-card-main { flex: 1; padding: 16px 18px; text-decoration: none; }
.src-card-main:hover h3 { color: var(--accent-dark); }
.src-date { color: var(--ink-light); font-size: 11px; letter-spacing: .06em; }
.src-card h3 { margin: 6px 0 8px; font-size: 15.5px; line-height: 1.45; }
.src-card p { margin: 0; color: var(--ink-soft); font-size: 13px; }
.src-back { margin: 0; padding: 9px 18px; border-top: 1px solid var(--border); color: var(--ink-light); font-size: 11.5px; }
.src-orphan-tag { color: #8f3f2b; }
.src-excerpt { max-width: var(--measure); padding: 18px 20px; border: 1px solid var(--border); background: var(--bg-card); color: var(--ink-soft); white-space: pre-wrap; font-size: 15px; }

/* ------------------------------------------------------------------ 首页 */

.hero { padding: 6px 0 34px; border-bottom: 1px solid var(--border-strong); }
.hero h1 { margin: 0; }
.hero-name { display: block; font-size: clamp(52px, 9vw, 104px); line-height: .96; letter-spacing: -.045em; }
.hero-sub { display: block; max-width: 22em; margin-top: 16px; color: var(--accent-dark); font-family: var(--sans); font-size: clamp(15px, 2vw, 20px); font-weight: 500; line-height: 1.5; }
.hero-lede { max-width: var(--measure); margin: 18px 0 0; color: var(--ink-soft); font-size: 16px; }
.hero-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; max-width: 46em; margin: 28px 0 0; padding: 18px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.hero-stats dt { color: var(--ink-light); font-size: 11px; letter-spacing: .1em; }
.hero-stats dd { margin: 4px 0 0; font-family: var(--serif); font-size: clamp(22px, 3vw, 32px); line-height: 1.1; }
.hero-stats dd small { display: block; margin-top: 3px; color: var(--ink-light); font-family: var(--sans); font-size: 11px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 26px 0 0; }

.nx-opening { border-bottom: 0; }
.home-layers { padding: 20px 0 0; }
.home-layers-title { margin: 0 0 8px; font-size: clamp(24px, 3vw, 34px); }

.hl { display: grid; grid-template-columns: 60px minmax(0, 1fr); gap: 24px; padding: 30px 0; border-top: 1px solid var(--border); }
.hl-rail { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.hl-index { font-family: var(--serif); font-size: 20px; font-weight: 700; color: var(--accent); }
.hl-line { flex: 1; width: 3px; background: var(--accent); border-radius: 2px; }
.hl.l1 .hl-index { color: var(--l1); } .hl.l1 .hl-line { background: var(--l1); }
.hl.l2 .hl-index { color: var(--l2); } .hl.l2 .hl-line { background: var(--l2); }
.hl.l3 .hl-index { color: var(--l3); } .hl.l3 .hl-line { background: var(--l3); }
.hl.l4 .hl-index { color: var(--l4); } .hl.l4 .hl-line { background: var(--l4); }
.hl.l5 .hl-index { color: var(--l5); } .hl.l5 .hl-line { background: var(--l5); }
.hl-more { display: flex; flex-wrap: wrap; gap: 10px; }
.hl-body { min-width: 0; }
.hl-body > h2 { margin: 0 0 6px; font-size: clamp(22px, 2.8vw, 30px); }
.hl-body > h2 a { text-decoration: none; }
.hl-body > h2 a:hover { color: var(--accent-dark); }
.hl-one { margin: 0 0 16px; color: var(--ink-light); font-size: 14px; }
.hl-entries { margin: 18px 0 0; }
.hl-label { margin: 0 0 8px; color: var(--ink-light); font-size: 11px; letter-spacing: .14em; }
.hl-more { margin: 22px 0 0; }
.home-closing { max-width: var(--measure); margin: 34px 0 0; color: var(--ink-light); font-size: 13px; }

/* ------------------------------------------------------------------ 层页 */

.layer-hero { position: relative; padding: 0 0 28px; border-bottom: 3px solid var(--accent); }
.layer-hero.l1 { border-bottom-color: var(--l1); }
.layer-hero.l2 { border-bottom-color: var(--l2); }
.layer-hero.l3 { border-bottom-color: var(--l3); }
.layer-hero.l4 { border-bottom-color: var(--l4); }
.layer-hero.l5 { border-bottom-color: var(--l5); }
.layer-index { margin: 0; font-family: var(--serif); font-size: clamp(40px, 7vw, 76px); line-height: 1; color: var(--border-strong); }
.layer-hero.l1 .layer-index { color: var(--l1); opacity: .28; }
.layer-hero.l2 .layer-index { color: var(--l2); opacity: .28; }
.layer-hero.l3 .layer-index { color: var(--l3); opacity: .32; }
.layer-hero.l4 .layer-index { color: var(--l4); opacity: .32; }
.layer-hero.l5 .layer-index { color: var(--l5); opacity: .32; }
.layer-hero h1 { margin: 4px 0 0; font-size: clamp(28px, 4.4vw, 48px); }
.layer-facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; max-width: 40em; margin: 24px 0 0; }
.layer-facts dt { color: var(--ink-light); font-size: 11px; }
.layer-facts dd { margin: 2px 0 0; font-family: var(--serif); font-size: 24px; }

.ncards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; max-width: 72em; }
.ncards-tight { grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); }
.ncard {
  display: flex; flex-direction: column; gap: 6px;
  min-height: 140px; padding: 16px 18px;
  border: 1px solid var(--border); border-left: 3px solid var(--accent);
  background: var(--bg-card); text-decoration: none;
  transition: border-color .15s ease, transform .15s ease;
}
.ncard:hover { border-color: var(--accent); transform: translateY(-2px); }
.ncard.l1 { border-left-color: var(--l1); }
.ncard.l2 { border-left-color: var(--l2); }
.ncard.l3 { border-left-color: var(--l3); }
.ncard.l4 { border-left-color: var(--l4); }
.ncard.l5 { border-left-color: var(--l5); }
.ncard-kind { color: var(--ink-light); font-size: 11px; letter-spacing: .1em; }
.ncard h3 { margin: 0; font-size: 17px; }
.ncard p { flex: 1; margin: 0; color: var(--ink-soft); font-size: 13px; }
.ncard-deg { color: var(--ink-light); font-size: 11px; }

.node-pager { display: grid; grid-template-columns: 1fr auto 1fr; gap: 12px; align-items: center; margin-top: 34px; padding-top: 22px; border-top: 1px solid var(--border-strong); }
.node-pager a { display: block; min-height: 44px; padding: 8px 12px; text-decoration: none; }
.pager-prev span, .pager-next span { display: block; color: var(--ink-light); font-size: 11px; }
.pager-prev strong, .pager-next strong { display: block; font-family: var(--serif); font-size: 15px; }
.pager-next { text-align: right; }
.pager-up { color: var(--ink-light); font-size: 12px; text-align: center; white-space: nowrap; }
.pager-prev:hover strong, .pager-next:hover strong, .pager-up:hover { color: var(--accent-dark); }
.pager-void { display: block; }

/* ------------------------------------------------------------ 主题 / 关于 */

.t-summary { max-width: var(--measure); margin: 18px 0 0; padding: 14px 16px; border-left: 3px solid var(--border-strong); background: var(--bg-sunk); color: var(--ink-soft); font-size: 14px; }
.t-shell { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 40px; align-items: start; padding-top: 8px; }
.t-main { min-width: 0; }
.t-aside { position: sticky; top: 28px; order: 2; font-size: 13px; }
.t-aside-title { margin: 0 0 10px; color: var(--ink-light); font-size: 11px; letter-spacing: .14em; }
.t-toc ol { margin: 0 0 26px; padding: 0 0 0 4px; list-style: none; counter-reset: toc; }
.t-toc li { counter-increment: toc; margin: 0 0 2px; }
.t-toc a { display: block; padding: 6px 8px; border-left: 2px solid var(--border); color: var(--ink-soft); text-decoration: none; }
.t-toc a::before { content: counter(toc, decimal-leading-zero) '  '; color: var(--ink-light); font-size: 11px; }
.t-toc a:hover { border-left-color: var(--accent); background: var(--accent-light); color: var(--accent-dark); }
.t-rel { padding-top: 16px; border-top: 1px solid var(--border); }
.t-main .nx { max-width: 100%; }
.t-main .prose { max-width: var(--measure); }

/* ------------------------------------------------------------------ 路径 */

.path-progress { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin: 26px 0 0; padding: 16px 18px; border: 1px solid var(--border); background: var(--bg-card); }
.pp-bar { flex: 1 1 200px; height: 8px; border-radius: 99px; background: var(--bg-sunk); overflow: hidden; }
.pp-bar i { display: block; width: 0; height: 100%; background: var(--accent); transition: width .2s ease; }
.pp-text { margin: 0; color: var(--ink-soft); font-size: 13px; white-space: nowrap; }
.pp-reset { min-height: 36px; padding: 6px 12px; font-size: 12px; }

.steps { margin: 30px 0 0; padding: 0; list-style: none; }
.step { display: grid; grid-template-columns: 60px minmax(0, 1fr); gap: 24px; padding: 26px 0; border-top: 1px solid var(--border); }
.step-rail { display: flex; flex-direction: column; align-items: center; gap: 10px; }
.step-num { font-family: var(--serif); font-size: 22px; color: var(--accent); }
.step-line { flex: 1; width: 3px; border-radius: 2px; background: var(--accent); }
.step.l1 .step-num { color: var(--l1); } .step.l1 .step-line { background: var(--l1); }
.step.l2 .step-num { color: var(--l2); } .step.l2 .step-line { background: var(--l2); }
.step.l3 .step-num { color: var(--l3); } .step.l3 .step-line { background: var(--l3); }
.step.l4 .step-num { color: var(--l4); } .step.l4 .step-line { background: var(--l4); }
.step.l5 .step-num { color: var(--l5); } .step.l5 .step-line { background: var(--l5); }
.step-body { min-width: 0; }
.step-meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 12px; }
.step-body h2 { margin: 0 0 10px; max-width: var(--measure); font-size: clamp(19px, 2.4vw, 25px); }
.step-why { max-width: var(--measure); margin: 0 0 18px; color: var(--ink-soft); font-size: 15px; }
.step-links { margin: 0 0 14px; }
.step-done { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; margin-top: 6px; padding: 6px 14px 6px 10px; border: 1px solid var(--border-strong); border-radius: 99px; color: var(--ink-soft); font-size: 13px; cursor: pointer; }
.step-done input { width: 18px; height: 18px; accent-color: var(--accent); }
.step.is-done .step-done { border-color: var(--l5); background: #eef1ea; color: var(--l5); }
.step.is-done .step-num { opacity: .45; }

/* ------------------------------------------------------------------ 页脚 */

.site-foot { margin-top: 56px; padding-top: 26px; border-top: 1px solid var(--border-strong); color: var(--ink-light); font-size: 12.5px; }
.foot-tiers { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 0 0 12px; }
.foot-tiers strong { color: var(--ink-soft); font-weight: 600; }
.foot-note { max-width: 60em; margin: 0 0 14px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 6px 16px; }
.foot-links a { min-height: 32px; display: inline-flex; align-items: center; color: var(--ink-light); text-decoration: none; }
.foot-links a:hover { color: var(--accent-dark); text-decoration: underline; }

/* ------------------------------------------------------------------ 响应 */

@media (max-width: 1180px) {
  :root { --sidebar-w: 244px; }
  .main { padding: 40px 34px 70px; }
  .t-shell { grid-template-columns: minmax(0, 1fr) 210px; gap: 28px; }
}

@media (max-width: 900px) {
  .t-shell { grid-template-columns: 1fr; gap: 20px; }
  .t-aside { position: static; order: 0; padding-bottom: 18px; border-bottom: 1px solid var(--border); }
  .t-toc ol { margin-bottom: 12px; }
  .hero-stats, .layer-facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  :root { --sidebar-w: 0px; --measure: 100%; }
  body { font-size: 16px; }

  .sidebar {
    width: min(84vw, 300px);
    transform: translateX(-105%);
    transition: transform .2s ease;
    box-shadow: 8px 0 28px rgba(51, 41, 31, .16);
  }
  .sidebar.open { transform: translateX(0); }
  .mobile-menu-btn {
    position: fixed; top: 10px; left: 10px; z-index: 40;
    display: grid; place-items: center;
    width: 44px; height: 44px;
    border: 1px solid var(--border-strong); border-radius: var(--radius);
    background: var(--bg-card); color: var(--accent-dark);
    font-size: 18px; cursor: pointer;
  }
  .scrim { position: fixed; inset: 0; z-index: 25; display: block; background: rgba(51,41,31,.35); }
  .scrim[hidden] { display: none; }

  .main { margin-left: 0; padding: 66px 16px 56px; max-width: 100%; }
  .nx { max-width: 100%; }
  .prose, .prose-long, .nx-lede, .nx-text, .node-lede, .hero-lede,
  .analogy-card, .lesson-card, .core-list, .mis-list, .case-list, .qa-list,
  .do-list, .fact-grid, .timeline, .rel-groups, .src-list, .t-summary,
  .step-body h2, .step-why, .home-closing { max-width: 100%; }
  .prose-long { font-size: 16.5px; }

  .hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hl, .step { grid-template-columns: 34px minmax(0, 1fr); gap: 14px; }
  .hl-index, .step-num { font-size: 15px; }
  .hl-line, .step-line { width: 2px; }
  .deep-grid, .ncards, .ncards-tight, .src-cards { grid-template-columns: 1fr; }
  .core-item { grid-template-columns: 30px 1fr; gap: 10px; }
  .timeline li { grid-template-columns: 1fr; gap: 4px; }
  .node-pager { grid-template-columns: 1fr; text-align: left; }
  .pager-next { text-align: left; }
  .pager-up { text-align: left; }
  .pager-void { display: none; }
  .quote { padding: 16px 16px; }
  .quote blockquote p { font-size: 16px; }
  .q-ext { margin-left: 0; }
  .nx-fold > summary { padding-top: 26px; }
  .fact-grid { grid-template-columns: 1fr; }

  .src-list li { padding: 6px 0; }
  .fold-hint { width: 34px; height: 34px; }
}

/* F14 触控目标 ≥44px。触发条件是「宽度到平板档」或「指针是粗指针」——
   768px 竖屏 iPad 走的是有侧栏的桌面布局，但手指还是手指。
   正文里的行内链接按 WCAG 2.5.8 的 inline 例外不强制放大。 */
@media (max-width: 900px), (hover: none) and (pointer: coarse) {
  .chip, .src-filter, .nav-item, .nav-sub a, .rail-item,
  .foot-links a, .button, .t-toc a, .src-list a, .hl-body > h2 a { min-height: 44px; }
  .chip { padding: 10px 14px; }
  .t-toc a, .src-list a, .hl-body > h2 a { display: flex; align-items: center; }
  .tl-event a, .back-hub { display: inline-block; min-height: 44px; padding: 10px 0; }
  .nx-fold > summary { min-height: 44px; }
}

@media (max-width: 380px) {
  .main { padding: 62px 12px 48px; }
  .hero-name { font-size: 48px; }
}