/* ============================================================
   本体论工程手册 · 样式表
   设计取向：研究报告 / 编辑排版 / 纸感底 / 单一强调色
   ============================================================ */

:root {
  --bg: #fbfaf6;
  --bg-elev: #ffffff;
  --bg-soft: #f3f1ea;
  --ink: #17181a;
  --ink-2: #3d3f44;
  --ink-3: #6b6d73;
  --line: #e2ded2;
  --line-strong: #cfc9b9;
  --accent: #14584c;
  --accent-soft: #e6efec;
  --rust: #9c4a24;
  --code-bg: #f2efe6;
  --shadow: 0 1px 2px rgba(20, 24, 28, .04), 0 8px 24px rgba(20, 24, 28, .05);
  --serif: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "Georgia", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --sidebar-w: 268px;
  --toc-w: 210px;
  --measure: 44rem;
}

html[data-theme="dark"] {
  --bg: #111315;
  --bg-elev: #171a1d;
  --bg-soft: #1b1f22;
  --ink: #e9e6de;
  --ink-2: #c2beb4;
  --ink-3: #8e8b83;
  --line: #2a2e32;
  --line-strong: #3a3f44;
  --accent: #6fb8a6;
  --accent-soft: #16302b;
  --rust: #d08a63;
  --code-bg: #1c2124;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 32px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
a:hover { border-bottom-color: var(--accent); }

.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: var(--bg-elev); padding: 8px 12px; z-index: 99; }

/* ---------------- 顶栏 ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 14px;
  height: 58px; padding: 0 22px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 9px; font-weight: 600; letter-spacing: .02em; border: 0; color: var(--ink); }
.brand-mark { color: var(--accent); font-size: 15px; }
.brand-text { font-family: var(--serif); font-size: 17px; }

.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }

.icon-btn, .search-btn {
  font: inherit; color: var(--ink-2); background: transparent;
  border: 1px solid var(--line); border-radius: 7px; cursor: pointer;
  height: 34px; padding: 0 10px;
}
.icon-btn:hover, .search-btn:hover { border-color: var(--line-strong); color: var(--ink); }
.icon-search { display: none; width: 15px; height: 15px; }
.search-btn { display: flex; align-items: center; gap: 8px; font-size: 13.5px; }
.search-btn kbd {
  font-family: var(--mono); font-size: 11px; color: var(--ink-3);
  border: 1px solid var(--line); border-radius: 4px; padding: 0 5px; line-height: 17px;
}
.nav-toggle { display: none; }

/* ---------------- 布局 ---------------- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr) var(--toc-w);
  gap: 0;
  max-width: 1360px; margin: 0 auto;
}

.sidebar {
  position: sticky; top: 58px; align-self: start;
  height: calc(100vh - 58px); overflow-y: auto;
  padding: 26px 18px 60px 22px;
  border-right: 1px solid var(--line);
  font-size: 14px;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 3px; }

.nav-group { margin-bottom: 22px; }
.nav-group-title {
  font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--ink-3); margin-bottom: 7px; padding-left: 9px;
}
.site-nav ul { list-style: none; margin: 0; padding: 0; }
.site-nav li a {
  display: block; padding: 6px 9px; border-radius: 6px;
  color: var(--ink-2); border: 0; line-height: 1.5;
}
.site-nav li a:hover { background: var(--bg-soft); color: var(--ink); }
.site-nav li a.is-active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }

.main { min-width: 0; padding: 40px 52px 80px; }

/* ---------------- 正文 ---------------- */
.article { max-width: var(--measure); margin: 0 auto; }

.chapter-kicker {
  font-size: 12px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 10px;
}
.chapter-title {
  font-family: var(--serif); font-size: 2.15rem; line-height: 1.28;
  margin: 0 0 12px; font-weight: 700; letter-spacing: -.01em;
}
.chapter-sub {
  color: var(--ink-3); font-size: 15.5px; margin: 0 0 34px;
  padding-bottom: 22px; border-bottom: 1px solid var(--line);
}

.article h2 {
  font-family: var(--serif); font-size: 1.42rem; line-height: 1.4;
  margin: 2.6em 0 .7em; padding-top: .2em; font-weight: 700;
}
.article h2::before {
  content: ""; display: block; width: 34px; height: 2px;
  background: var(--accent); margin-bottom: 14px; opacity: .8;
}
.article h3 {
  font-family: var(--serif); font-size: 1.12rem; margin: 2em 0 .55em; font-weight: 700;
}
.article h4 { font-size: 1rem; margin: 1.6em 0 .4em; color: var(--ink-2); }

.article p { margin: 0 0 1.1em; }
.article strong { font-weight: 700; color: var(--ink); }
.article em { font-style: normal; color: var(--rust); }

.article ul, .article ol { margin: 0 0 1.2em; padding-left: 1.35em; }
.article li { margin: .34em 0; }
.article li::marker { color: var(--ink-3); }

.article hr { border: 0; border-top: 1px solid var(--line); margin: 2.6em 0; }

.article blockquote {
  margin: 1.4em 0; padding: 2px 0 2px 20px;
  border-left: 2px solid var(--accent);
  color: var(--ink-2);
}
.article blockquote p { margin: .4em 0; }
.article blockquote p:first-child { margin-top: 0; }
.article blockquote p:last-child { margin-bottom: 0; }

code {
  font-family: var(--mono); font-size: .88em;
  background: var(--code-bg); padding: .12em .38em; border-radius: 4px;
  border: 1px solid var(--line);
}
pre {
  margin: 1.3em 0; padding: 16px 18px; overflow-x: auto;
  background: var(--code-bg); border: 1px solid var(--line); border-radius: 8px;
  line-height: 1.65;
}
pre code { background: none; border: 0; padding: 0; font-size: 13px; }

.table-wrap { margin: 1.3em 0; overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; }
table { border-collapse: collapse; width: 100%; font-size: 14px; background: var(--bg-elev); }
th, td { padding: 9px 13px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--bg-soft); font-weight: 600; font-size: 13px; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td { color: var(--ink-2); }

.lede { font-size: 17px; color: var(--ink-2); }

.note {
  margin: 1.6em 0; padding: 14px 18px; border-radius: 8px;
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 18%, transparent);
  font-size: 14.5px; color: var(--ink-2);
}

/* ---------------- 目录 ---------------- */
.toc {
  position: sticky; top: 58px; align-self: start;
  max-height: calc(100vh - 58px); overflow-y: auto;
  padding: 44px 20px 60px 8px; font-size: 13px;
}
.toc-title { font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 10px; }
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line); }
.toc li { margin: 0; }
.toc li a {
  display: block; padding: 4px 0 4px 12px; color: var(--ink-3);
  border: 0; line-height: 1.5; margin-left: -1px; border-left: 1px solid transparent;
}
.toc li a:hover { color: var(--ink); }
.toc li a.active { color: var(--accent); border-left-color: var(--accent); }
.toc .lvl3 a { padding-left: 24px; font-size: 12.5px; }

/* ---------------- 卡片 ---------------- */
.cards { display: grid; gap: 16px; margin: 26px 0 10px; }

.card {
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: 10px; padding: 18px 20px 16px;
  box-shadow: var(--shadow);
}
.card-head { display: flex; align-items: baseline; gap: 10px; }
.card-title { font-family: var(--serif); font-size: 1.08rem; margin: 0; font-weight: 700; }
.tier {
  margin-left: auto; font-family: var(--mono); font-size: 11px;
  padding: 1px 7px; border-radius: 4px; border: 1px solid currentColor; letter-spacing: .04em;
}
.tier-s { color: #14584c; background: #e6efec; }
.tier-a { color: #1f4e79; background: #e7eef6; }
.tier-b { color: #6b5a1e; background: #f4efdf; }
.tier-c { color: #6b6d73; background: #f0f0ee; }

html[data-theme="dark"] .tier-s { color: #6fb8a6; background: #16302b; }
html[data-theme="dark"] .tier-a { color: #8fb8dd; background: #16232e; }
html[data-theme="dark"] .tier-b { color: #d6c083; background: #2a2517; }
html[data-theme="dark"] .tier-c { color: #a9aaa5; background: #22252a; }

.card-repo { font-family: var(--mono); font-size: 12.5px; margin: 4px 0 8px; }
.card-repo a { color: var(--ink-3); }
.card-repo a:hover { color: var(--accent); }
.card-meta { display: flex; flex-wrap: wrap; gap: 12px; font-size: 12px; color: var(--ink-3); margin-bottom: 10px; }
.card-meta .stars { color: var(--ink-2); font-family: var(--mono); }
.card-body { font-size: 14.5px; color: var(--ink-2); line-height: 1.8; }
.card-adopt {
  margin-top: 12px; padding-top: 10px; border-top: 1px dashed var(--line);
  font-size: 13.5px; color: var(--ink-2);
}
.adopt-label {
  display: inline-block; margin-right: 8px; font-size: 11px; letter-spacing: .1em;
  color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: 3px; padding: 0 5px;
}

/* ---------------- 翻页 ---------------- */
.pager {
  display: flex; justify-content: space-between; gap: 16px;
  margin-top: 64px; padding-top: 22px; border-top: 1px solid var(--line);
}
.pager a { display: flex; flex-direction: column; gap: 3px; border: 0; max-width: 46%; }
.pager a span { font-size: 11.5px; letter-spacing: .12em; color: var(--ink-3); text-transform: uppercase; }
.pager a strong { font-family: var(--serif); font-size: 15px; color: var(--ink); font-weight: 600; }
.pager-next { text-align: right; margin-left: auto; }
.pager a:hover strong { color: var(--accent); }

/* ---------------- 页脚 ---------------- */
.site-footer {
  border-top: 1px solid var(--line); margin-top: 40px;
  padding: 22px 24px 40px; text-align: center;
  font-size: 12.5px; color: var(--ink-3); line-height: 1.9;
}

/* ---------------- 搜索 ---------------- */
.search-overlay {
  position: fixed; inset: 0; z-index: 60;
  background: color-mix(in srgb, var(--ink) 32%, transparent);
  backdrop-filter: blur(3px);
  display: flex; align-items: flex-start; justify-content: center; padding-top: 12vh;
}
.search-overlay[hidden] { display: none; }
.search-panel {
  width: min(640px, 92vw); background: var(--bg-elev);
  border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow);
  overflow: hidden;
}
#search-input {
  width: 100%; border: 0; border-bottom: 1px solid var(--line);
  background: transparent; color: var(--ink); font: inherit; font-size: 16px;
  padding: 16px 18px; outline: none;
}
.search-results { max-height: 56vh; overflow-y: auto; }
.sr-item { display: block; padding: 11px 18px; border-bottom: 1px solid var(--line); border-left: 2px solid transparent; }
.sr-item:hover, .sr-item.is-sel { background: var(--bg-soft); border-left-color: var(--accent); }
.sr-item .sr-page { font-size: 11.5px; letter-spacing: .1em; color: var(--ink-3); text-transform: uppercase; }
.sr-item .sr-title { font-size: 14.5px; color: var(--ink); }
.sr-empty { padding: 18px; color: var(--ink-3); font-size: 14px; }
.search-hint { padding: 9px 18px; font-size: 12px; color: var(--ink-3); border-top: 1px solid var(--line); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1180px) {
  .layout { grid-template-columns: var(--sidebar-w) minmax(0, 1fr); }
  .toc { display: none; }
  .main { padding: 36px 40px 70px; }
}

@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .sidebar {
    position: fixed; top: 58px; left: 0; width: 82vw; max-width: 320px;
    background: var(--bg-elev); z-index: 50; transform: translateX(-102%);
    transition: transform .22s ease; border-right: 1px solid var(--line);
  }
  body.nav-open .sidebar { transform: none; box-shadow: var(--shadow); }
  .main { padding: 28px 20px 60px; }
  .chapter-title { font-size: 1.66rem; }
  .search-btn span { display: none; }
  .search-btn kbd { display: none; }
  .icon-search { display: inline-block; }
}

/* ---------------- 打印 ---------------- */
@media print {
  .topbar, .sidebar, .toc, .pager, .site-footer, .search-overlay { display: none !important; }
  .layout { display: block; }
  .main { padding: 0; }
  .article { max-width: none; }
  body { font-size: 11pt; background: #fff; }
  a { color: inherit; }
  .card { break-inside: avoid; box-shadow: none; }
  h2, h3 { break-after: avoid; }
}

/* ---------------- 封面 ---------------- */
.hero { padding: 14px 0 44px; border-bottom: 1px solid var(--line); margin-bottom: 40px; }
.hero-kicker { font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin-bottom: 18px; }
.hero-title { font-family: var(--serif); font-size: 3.1rem; line-height: 1.15; margin: 0 0 10px; letter-spacing: -.02em; }
.hero-sub { font-family: var(--mono); font-size: 13px; color: var(--ink-3); letter-spacing: .04em; margin-bottom: 26px; }
.hero-lede { font-size: 18px; line-height: 1.9; color: var(--ink-2); max-width: 38em; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 26px; font-size: 12.5px; color: var(--ink-3); letter-spacing: .04em; }
@media (max-width: 700px) { .hero-title { font-size: 2.1rem; } .hero-lede { font-size: 16px; } }

/* ---------------- 打印版长文档 ---------------- */
.print-doc { background: #fff; }
.print-doc .article { max-width: 44rem; margin: 0 auto; padding: 48px 0; }
.print-chapter { break-before: page; }
.print-chapter:first-child { break-before: auto; }
@media print {
  .print-doc .article { padding: 0; }
  @page { margin: 18mm 16mm; }
  pre, .table-wrap { overflow: visible !important; }
  pre { white-space: pre-wrap; word-break: break-word; font-size: 10pt; }
  table { font-size: 9.5pt; }
  .print-doc h1, .print-doc h2 { break-after: avoid; }
  .print-doc p, .print-doc li, .print-doc tr { break-inside: avoid; }
}

/* ---------------- 附录 C 总表 ---------------- */
.tbl-projects { width: 100%; table-layout: fixed; }
.tbl-projects td, .tbl-projects th { font-size: 13.5px; padding: 9px 10px; }
.tbl-projects td:first-child { overflow-wrap: break-word; }
.tbl-projects .num { text-align: right; font-variant-numeric: tabular-nums; }
.tbl-projects .nowrap { white-space: nowrap; }
.tbl-projects .sub { display: block; color: var(--ink-3); font-size: 12px; line-height: 1.5; }
.tbl-projects .tier-s, .tbl-projects .tier-a, .tbl-projects .tier-b, .tbl-projects .tier-c {
  background: none; padding: 0; border-radius: 0; font-weight: 700;
}
.tbl-projects .tier-s { color: var(--accent); }
.tbl-projects .tier-a { font-weight: 700; }
.tbl-projects .tier-c { color: var(--ink-3); }
.tbl-projects tr.grp td { background: var(--bg-soft); font-weight: 600; color: var(--ink);
  font-size: 13px; letter-spacing: .02em; padding-top: 14px; padding-bottom: 14px; }
.tbl-projects tr.grp td span { color: var(--ink-3); font-weight: 400; margin-left: 8px; }