:root {
  color-scheme: light;
  --bg: #f3f6f5;
  --surface: #fbfcfc;
  --surface-2: #edf2f0;
  --text: #17201d;
  --muted: #5d6b66;
  --faint: #87938f;
  --line: #d7dfdc;
  --line-strong: #bdc9c5;
  --accent: #087f69;
  --accent-strong: #056653;
  --accent-soft: #dff2ec;
  --warning: #93620b;
  --warning-soft: #fff2cf;
  --danger: #b53b42;
  --danger-soft: #feecee;
  --code-bg: #e9efed;
  --shadow: 0 12px 36px rgba(35, 54, 48, 0.08);
  --topbar-height: 68px;
  --nav-width: 292px;
  --toc-width: 236px;
  --radius: 6px;
  --sans: "Avenir Next", Avenir, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #101614;
    --surface: #151d1a;
    --surface-2: #1b2622;
    --text: #e6eeeb;
    --muted: #a7b5b0;
    --faint: #7e8d88;
    --line: #2b3934;
    --line-strong: #40514b;
    --accent: #58cdb3;
    --accent-strong: #7de1ca;
    --accent-soft: #173c33;
    --warning: #e3b45e;
    --warning-soft: #3b301d;
    --danger: #f08a90;
    --danger-soft: #432327;
    --code-bg: #1e2925;
    --shadow: 0 14px 42px rgba(0, 0, 0, 0.24);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101614;
  --surface: #151d1a;
  --surface-2: #1b2622;
  --text: #e6eeeb;
  --muted: #a7b5b0;
  --faint: #7e8d88;
  --line: #2b3934;
  --line-strong: #40514b;
  --accent: #58cdb3;
  --accent-strong: #7de1ca;
  --accent-soft: #173c33;
  --warning: #e3b45e;
  --warning-soft: #3b301d;
  --danger: #f08a90;
  --danger-soft: #432327;
  --code-bg: #1e2925;
  --shadow: 0 14px 42px rgba(0, 0, 0, 0.24);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--topbar-height) + 24px); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.72;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
button, input { font: inherit; }
a { color: var(--accent-strong); text-underline-offset: 3px; }
a:hover { color: var(--accent); }

.skip-link {
  position: fixed;
  left: 12px;
  top: -60px;
  z-index: 20;
  padding: 8px 12px;
  border-radius: var(--radius);
  background: var(--accent-strong);
  color: var(--surface);
  text-decoration: none;
}
.skip-link:focus { top: 10px; }

.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 10;
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 24px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(14px);
}

.brand { display: flex; align-items: center; gap: 11px; color: var(--text); text-decoration: none; }
.brand__mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: var(--radius);
  background: var(--accent);
  color: #f5fffb;
  font: 700 12px/1 var(--mono);
}
.brand__text { display: grid; line-height: 1.2; }
.brand__text strong { font-size: 14px; }
.brand__text small { margin-top: 3px; color: var(--muted); font-size: 11px; }
.topbar__actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.audit-date { color: var(--muted); font: 12px/1 var(--mono); }
.icon-button {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.icon-button:hover { border-color: var(--line-strong); background: var(--surface-2); }
.icon-button:active { transform: translateY(1px); }
.icon-button:focus-visible, a:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: 2px; }
.menu-button { display: none; }

.app-shell {
  min-height: 100dvh;
  display: grid;
  grid-template-columns: var(--nav-width) minmax(0, 1fr) var(--toc-width);
  padding-top: var(--topbar-height);
}

.site-nav {
  position: fixed;
  top: var(--topbar-height);
  bottom: 0;
  left: 0;
  width: var(--nav-width);
  overflow-y: auto;
  padding: 26px 18px 32px;
  border-right: 1px solid var(--line);
  background: var(--surface);
}
.site-nav__intro { padding: 0 9px 22px; border-bottom: 1px solid var(--line); }
.site-nav__intro p, .page-toc > p, .status-label {
  margin: 0 0 8px;
  color: var(--faint);
  font: 700 10px/1.3 var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.site-nav__intro strong { display: block; font-size: 13px; line-height: 1.45; }
.site-nav__intro span { display: block; margin-top: 8px; color: var(--muted); font-size: 12px; line-height: 1.55; }
.site-nav nav { display: grid; gap: 3px; padding: 18px 0; }
.site-nav__link {
  display: grid;
  gap: 3px;
  padding: 10px 11px;
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text);
  text-decoration: none;
}
.site-nav__link span { font-weight: 650; font-size: 13px; }
.site-nav__link small { color: var(--muted); font-size: 11px; line-height: 1.45; }
.site-nav__link:hover { background: var(--surface-2); color: var(--text); }
.site-nav__link.active { border-left-color: var(--accent); background: var(--accent-soft); color: var(--accent-strong); }
.site-nav__status { margin: 6px 9px 0; padding-top: 18px; border-top: 1px solid var(--line); }
.site-nav__status strong { color: var(--warning); font: 700 13px/1 var(--mono); }
.site-nav__status p { margin: 8px 0 0; color: var(--muted); font-size: 11px; line-height: 1.55; }

.document {
  grid-column: 2;
  width: min(100%, 980px);
  min-width: 0;
  margin: 0 auto;
  padding: 54px 56px 96px;
}
.document__loading {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
}

.page-toc {
  position: fixed;
  top: var(--topbar-height);
  right: 0;
  bottom: 0;
  width: var(--toc-width);
  overflow-y: auto;
  padding: 36px 22px;
  border-left: 1px solid var(--line);
  background: var(--bg);
}
.page-toc nav { display: grid; gap: 2px; }
.page-toc a { display: block; padding: 4px 8px; border-left: 2px solid transparent; color: var(--muted); font-size: 12px; line-height: 1.45; text-decoration: none; }
.page-toc a:hover, .page-toc a.active { color: var(--accent-strong); border-left-color: var(--accent); }
.page-toc a.level-3 { padding-left: 20px; font-size: 11px; }
.page-toc .back-to-top { margin-top: 18px; padding-top: 13px; border-top: 1px solid var(--line); border-left: 0; color: var(--accent-strong); }

.markdown-body { min-width: 0; overflow-wrap: anywhere; word-break: normal; }
.markdown-body > h1:first-child {
  margin: 0 0 36px;
  padding: 0 0 26px;
  border-bottom: 2px solid var(--text);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.15;
  font-weight: 720;
}
.markdown-body h2 { margin: 68px 0 20px; padding-top: 8px; font-size: 24px; line-height: 1.3; }
.markdown-body h3 { margin: 42px 0 14px; font-size: 18px; line-height: 1.4; }
.markdown-body h4 { margin: 30px 0 10px; font-size: 15px; }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 { max-width: 100%; overflow-wrap: anywhere; word-break: break-word; }
.markdown-body p { margin: 0 0 16px; max-width: 78ch; }
.markdown-body > blockquote:first-of-type {
  margin: -16px 0 34px;
  padding: 15px 18px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  color: var(--muted);
}
.markdown-body blockquote { margin: 22px 0; padding: 12px 18px; border-left: 3px solid var(--line-strong); background: var(--surface-2); color: var(--muted); }
.markdown-body blockquote p:last-child { margin-bottom: 0; }
.markdown-body ul, .markdown-body ol { margin: 12px 0 22px; padding-left: 25px; }
.markdown-body li { margin: 6px 0; padding-left: 2px; }
.markdown-body li::marker { color: var(--accent); }
.markdown-body strong { font-weight: 680; }
.markdown-body hr { height: 1px; margin: 40px 0; border: 0; background: var(--line); }

.markdown-body code {
  padding: 0.14em 0.38em;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--code-bg);
  color: var(--text);
  font: 0.88em/1.5 var(--mono);
  overflow-wrap: anywhere;
}
.markdown-body pre {
  position: relative;
  overflow: auto;
  margin: 22px 0 28px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--code-bg);
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--surface) 60%, transparent);
}
.markdown-body pre code { padding: 0; border: 0; background: transparent; white-space: pre; overflow-wrap: normal; }

.table-wrap { width: 100%; overflow-x: auto; margin: 22px 0 32px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.markdown-body table { width: 100%; min-width: 680px; border-collapse: collapse; font-size: 12.5px; line-height: 1.55; }
.markdown-body th, .markdown-body td { padding: 11px 13px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.markdown-body th:last-child, .markdown-body td:last-child { border-right: 0; }
.markdown-body tr:last-child td { border-bottom: 0; }
.markdown-body thead th { position: sticky; top: 0; z-index: 1; background: var(--surface-2); color: var(--text); font-weight: 700; }
.markdown-body tbody tr:hover { background: color-mix(in srgb, var(--accent-soft) 45%, transparent); }

.mermaid {
  min-width: 720px;
  padding: 20px;
  text-align: center;
}
.diagram-wrap { position: relative; overflow-x: auto; margin: 24px 0 34px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.diagram-label { position: sticky; left: 0; display: inline-block; padding: 7px 10px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface-2); color: var(--muted); font: 10px/1 var(--mono); }
.notice { margin: 20px 0; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.notice--error { border-color: var(--danger); background: var(--danger-soft); color: var(--danger); }

.heading-anchor { margin-left: 8px; color: var(--faint); font-weight: 400; text-decoration: none; opacity: 0; }
h2:hover .heading-anchor, h3:hover .heading-anchor, .heading-anchor:focus { opacity: 1; }

@media (max-width: 1220px) {
  :root { --toc-width: 0px; }
  .app-shell { grid-template-columns: var(--nav-width) minmax(0, 1fr); }
  .page-toc { display: none; }
}

@media (max-width: 800px) {
  :root { --topbar-height: 60px; }
  .topbar { padding: 0 13px; gap: 10px; }
  .menu-button { display: grid; }
  .audit-date, .brand__text small { display: none; }
  .app-shell { display: block; }
  .site-nav {
    z-index: 9;
    width: min(88vw, 320px);
    transform: translateX(-102%);
    transition: transform 180ms ease;
    box-shadow: var(--shadow);
  }
  body.nav-open { overflow: hidden; }
  body.nav-open .site-nav { transform: translateX(0); }
  .nav-backdrop { position: fixed; inset: var(--topbar-height) 0 0; z-index: 8; background: rgba(10, 18, 15, 0.44); }
  body.nav-open .nav-backdrop { display: block; }
  .document { width: 100%; padding: 34px 18px 72px; }
  .markdown-body { width: 100%; max-width: 100%; overflow: hidden; }
  .markdown-body > h1:first-child { font-size: 31px; }
  .markdown-body h2 { margin-top: 50px; font-size: 22px; }
  .markdown-body h3 { margin-top: 34px; }
  .table-wrap { width: 100%; max-width: 100%; border-radius: var(--radius); }
  .diagram-wrap { width: 100%; max-width: 100%; border-radius: var(--radius); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .site-nav { transition: none; }
}

@media print {
  :root { color-scheme: light; --bg: #fff; --surface: #fff; --text: #111; --muted: #444; --line: #bbb; --code-bg: #f4f4f4; }
  .topbar, .site-nav, .page-toc, .nav-backdrop, .skip-link { display: none !important; }
  .app-shell { display: block; padding: 0; }
  .document { width: 100%; max-width: none; padding: 0; }
  .markdown-body h2 { break-after: avoid; }
  .table-wrap, .diagram-wrap, .markdown-body pre { break-inside: avoid; box-shadow: none; }
  .table-wrap, .diagram-wrap { overflow: visible; }
  a { color: inherit; text-decoration: none; }
}