:root {
  --ink: #1f2937;
  --muted: #64748b;
  --line: #e2e8f0;
  --paper: #ffffff;
  --soft: #f8fafc;
  --orange: #f97316;
  --orange-dark: #c2410c;
  --blue: #075985;
  --blue-soft: #e0f2fe;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.72;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
.detail-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 12px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 800; }
.brand img { width: 34px; height: 34px; object-fit: contain; }
.nav-links { display: flex; align-items: center; gap: 18px; font-size: 14px; color: var(--muted); }
.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 44px 22px 28px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 34px;
  align-items: center;
}
.kicker {
  margin: 0 0 8px;
  color: var(--orange-dark);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
}
h1 { margin: 0; font-size: clamp(34px, 5vw, 58px); line-height: 1.05; letter-spacing: 0; overflow-wrap: anywhere; }
.subtitle { margin: 12px 0 0; font-size: 19px; color: var(--muted); }
.summary { margin: 22px 0 0; max-width: 720px; font-size: 17px; color: #475569; }
.meta-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.meta-pill {
  border: 1px solid var(--line);
  background: var(--soft);
  padding: 7px 10px;
  font-size: 13px;
  color: #334155;
  border-radius: 6px;
  max-width: 100%;
  overflow-wrap: anywhere;
}
.hero-media { border: 1px solid var(--line); background: var(--soft); border-radius: 8px; overflow: hidden; box-shadow: 0 18px 40px rgba(15, 23, 42, .08); }
.hero-media img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; display: block; }
.hero-media.diagram-media img { aspect-ratio: 16 / 9; object-fit: contain; background: #fff; }
main { border-top: 1px solid var(--line); }
.section { padding: 42px 22px; }
.section.is-soft { background: var(--soft); }
.container { max-width: 1120px; margin: 0 auto; }
.section h2 { margin: 0 0 18px; font-size: 27px; line-height: 1.22; }
.grid-2 { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, 380px); gap: 28px; align-items: start; }
.highlight-list { margin: 0; padding-left: 20px; color: #475569; }
.highlight-list li { margin: 8px 0; }
.stack { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { display: inline-flex; align-items: center; min-height: 30px; padding: 5px 9px; border: 1px solid #bae6fd; background: var(--blue-soft); color: #075985; border-radius: 999px; font-size: 13px; font-weight: 700; overflow-wrap: anywhere; }
.note-panel { border-left: 4px solid var(--orange); background: #fff7ed; padding: 16px 18px; color: #7c2d12; border-radius: 0 8px 8px 0; }
.metric-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.metric-card { min-height: 110px; padding: 15px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.metric-card b { display: block; color: var(--ink); font-size: 24px; line-height: 1.15; }
.metric-card span { display: block; margin-top: 6px; color: var(--muted); font-size: 13px; font-weight: 700; }
.flow-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; counter-reset: flow; }
.flow-list article { position: relative; min-height: 150px; padding: 16px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.flow-list article::before { counter-increment: flow; content: counter(flow); display: inline-grid; place-items: center; width: 28px; height: 28px; margin-bottom: 10px; border-radius: 999px; background: var(--orange); color: #fff; font-weight: 800; }
.flow-list h3 { margin: 0 0 6px; font-size: 18px; line-height: 1.3; }
.flow-list p { margin: 0; color: #475569; font-size: 14px; }
.wide-media { margin: 0; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: #fff; }
.wide-media img { display: block; width: 100%; background: var(--soft); }
.wide-media figcaption { padding: 10px 12px; color: var(--muted); font-size: 13px; }
.interface-table { width: 100%; table-layout: fixed; border-collapse: collapse; overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: #fff; font-size: 14px; }
.interface-table th, .interface-table td { padding: 11px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.interface-table th { color: #334155; background: var(--soft); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; }
.interface-table tr:last-child td { border-bottom: 0; }
.interface-table code { font-family: Consolas, "SFMono-Regular", monospace; font-size: .95em; }
.gallery { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.gallery figure { margin: 0; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: #fff; }
.gallery img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; display: block; }
.gallery figcaption { padding: 9px 11px; color: var(--muted); font-size: 13px; }
.gallery.diagram-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.gallery.diagram-gallery img { padding: 8px; object-fit: contain; background: #fff; }
.readme-box { border: 1px solid var(--line); border-radius: 8px; background: #fff; padding: 22px; overflow: hidden; }
.readme-box h2, .readme-box h3, .readme-box h4, .readme-box h5 { margin: 18px 0 8px; line-height: 1.3; }
.readme-box h2:first-child, .readme-box h3:first-child { margin-top: 0; }
.readme-box p { margin: 9px 0; color: #475569; }
.readme-box ul { margin: 8px 0 12px; padding-left: 20px; color: #475569; }
.readme-box blockquote { margin: 12px 0; padding: 10px 14px; border-left: 3px solid var(--orange); background: #fff7ed; color: #7c2d12; }
.readme-box pre { overflow-x: auto; padding: 12px; background: #0f172a; color: #e2e8f0; border-radius: 8px; font-size: 13px; line-height: 1.55; }
.readme-box code { font-family: Consolas, "SFMono-Regular", monospace; font-size: .95em; }
.excerpt-note { color: var(--muted); font-style: italic; }
.source-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 38px; padding: 8px 12px; border-radius: 6px; border: 1px solid var(--line); background: var(--paper); color: var(--ink); font-weight: 800; }
.button.primary { border-color: var(--orange); background: var(--orange); color: #fff; }
.button.video { border-color: var(--blue); background: var(--blue); color: #fff; }
.footer { border-top: 1px solid var(--line); padding: 24px 22px 34px; color: var(--muted); font-size: 14px; }
@media (max-width: 860px) {
  .hero, .grid-2 { grid-template-columns: 1fr; }
  .grid-2 > * { min-width: 0; }
  .hero-media { order: -1; }
  .metric-grid, .flow-list { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr; }
  .readme-box pre code,
  .interface-table code {
    white-space: pre-wrap;
    overflow-wrap: anywhere;
  }
  .nav-inner { align-items: flex-start; flex-direction: column; }
  .nav-links { flex-wrap: wrap; gap: 12px; }
}