:root {
  --ink: #092117;
  --ink-soft: #315043;
  --canvas: #eef2ec;
  --paper: #fafcf8;
  --line: #c9d5cd;
  --signal: #80f27b;
  --signal-deep: #17663a;
  --violet: #5d3a79;
  --rose: #ef6d72;
  --grid: rgba(127, 151, 141, .22);
  color: var(--ink);
  background: var(--canvas);
  font-family: Arial, "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body { background: var(--canvas); color: var(--ink); }
main {
  width: min(100%, 1600px);
  max-width: none;
  margin: 0 auto;
  padding: 18px 38px 64px;
}
main > header { border: 0; margin: 0; padding: 0; }

nav {
  display: grid;
  grid-template-columns: minmax(175px, 1fr) auto minmax(175px, 1fr);
  align-items: center;
  gap: 16px;
  margin: 0 0 46px;
}
nav .site-brand,
nav .service-status,
nav .page-context { color: var(--ink); text-decoration: none; font-size: 14px; font-weight: 800; letter-spacing: 0; }
nav .site-brand { justify-self: start; border: 0; border-radius: 0; padding: 0; background: transparent; white-space: nowrap; }
nav .site-brand span { color: var(--signal-deep); }
nav .nav-cluster {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px;
  border: 1px solid rgba(9, 33, 23, .06);
  border-radius: 999px;
  background: rgba(250, 252, 248, .96);
  box-shadow: 0 12px 26px rgba(20, 44, 31, .07);
}
nav .nav-cluster a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  border: 0;
  border-radius: 999px;
  padding: 0 13px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}
nav .nav-cluster a:hover { background: #dce8dd; text-decoration: none; }
nav .nav-cluster a.active { background: var(--ink); color: var(--signal); }
nav .service-status { justify-self: end; display: inline-flex; align-items: center; gap: 8px; color: var(--ink-soft); font-family: Consolas, "Courier New", monospace; font-size: 11px; }
nav .service-status::before { width: 8px; height: 8px; border-radius: 50%; background: var(--signal); content: ""; box-shadow: 0 0 0 4px rgba(128, 242, 123, .22); }
nav .page-context { justify-self: end; color: var(--ink); font-size: 15px; white-space: nowrap; }

h1, h2, h3, p { letter-spacing: 0; }
h1 { max-width: 1120px; margin: 0; color: var(--ink); font-size: clamp(56px, 10.2vw, 160px); line-height: .88; font-weight: 800; }
h2 { color: var(--ink); }
p { color: var(--ink-soft); }
a { color: inherit; }
code { color: inherit; }

.eyebrow { margin: 0 0 16px; color: var(--signal-deep); font: 700 11px/1.2 Consolas, "Courier New", monospace; letter-spacing: .08em; }
.home-hero { display: flex; flex-direction: column; gap: 38px; }
.home-lede { max-width: 670px; margin: 30px 0 0; font-size: clamp(17px, 1.6vw, 23px); line-height: 1.48; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 26px 0 0; }
.button-link { display: inline-flex; align-items: center; min-height: 45px; border: 1px solid var(--ink); border-radius: 999px; padding: 0 18px; background: transparent; color: var(--ink); font-size: 13px; font-weight: 800; text-decoration: none; }
.button-link:hover { background: var(--ink); color: var(--signal); text-decoration: none; }
.button-link.primary { background: var(--ink); color: var(--signal); }
.button-link.primary:hover { background: var(--signal-deep); color: #fff; border-color: var(--signal-deep); }
.hero-visual { position: relative; overflow: hidden; margin: auto 0 0; border: 1px solid #31483d; border-radius: 8px; background: #17212b; }
.hero-visual img { display: block; width: 100%; height: min(24vw, 320px); min-height: 250px; object-fit: contain; object-position: center; }
.hero-meta { position: absolute; z-index: 1; right: 16px; bottom: 14px; display: flex; gap: 12px; align-items: center; color: #e4f1e5; font: 700 11px/1 Consolas, "Courier New", monospace; }
.hero-meta span { padding: 8px 10px; border: 1px solid rgba(228, 241, 229, .35); border-radius: 999px; background: rgba(9, 33, 23, .72); }

.signal-strip { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin: 44px 0 0; background: var(--line); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.signal-item { min-height: 140px; padding: 24px 0 24px 22px; background: var(--canvas); }
.signal-value { display: block; color: var(--ink); font-size: clamp(36px, 4vw, 58px); font-weight: 800; line-height: 1; }
.signal-item small { display: block; margin-top: 10px; color: var(--ink-soft); font: 700 11px/1.4 Consolas, "Courier New", monospace; }

.route-section { margin-top: 88px; }
.section-heading { display: grid; grid-template-columns: minmax(0, .8fr) minmax(260px, 1.2fr); gap: 32px; padding-bottom: 25px; border-bottom: 1px solid var(--line); }
.section-heading h2 { margin: 0; font-size: clamp(33px, 4.8vw, 68px); line-height: .95; }
.section-heading p { max-width: 560px; margin: 0; font-size: 16px; line-height: 1.55; }
.route-list { border-bottom: 1px solid var(--line); }
.route-row { display: grid; grid-template-columns: minmax(120px, .7fr) minmax(260px, 1.6fr) auto; align-items: center; gap: 20px; padding: 24px 0; border-top: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.route-row:first-child { border-top: 0; }
.route-row:hover { color: var(--signal-deep); text-decoration: none; }
.route-index { font: 700 11px/1 Consolas, "Courier New", monospace; color: var(--signal-deep); }
.route-name { font-size: clamp(21px, 2.4vw, 34px); font-weight: 800; }
.route-detail { color: var(--ink-soft); font-size: 14px; line-height: 1.45; }
.route-arrow { font-size: 24px; font-weight: 700; }

.page-intro { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(260px, .75fr); gap: 48px; align-items: end; margin: 0 0 58px; padding-bottom: 30px; border-bottom: 1px solid var(--line); }
.page-intro h1 { font-size: clamp(50px, 8vw, 112px); }
.page-intro .lead { max-width: 550px; margin: 0; font-size: 17px; line-height: 1.55; }
.api-rail { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin: 0 0 44px; background: var(--line); border: 1px solid var(--line); }
.api-rail > div { min-height: 112px; padding: 16px; background: var(--paper); }
.api-rail strong { display: block; margin-bottom: 15px; color: var(--signal-deep); font: 800 11px/1 Consolas, "Courier New", monospace; }
.api-rail code { display: block; font-size: 13px; overflow-wrap: anywhere; }
.api-rail p { margin: 8px 0 0; font-size: 12px; line-height: 1.45; }

.library-section { margin-top: 62px; }
.library-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 18px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.library-heading h2 { margin: 0; font-size: clamp(28px, 3.7vw, 48px); }
.library-heading p { margin: 0; font: 700 11px/1.4 Consolas, "Courier New", monospace; }
.resource-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 1px; margin-top: 1px; background: var(--line); border: 1px solid var(--line); }
.resource-card { min-height: 220px; padding: 16px; background: var(--paper); }
.resource-card:hover { background: #e5f5e2; }
.resource-card img { width: 100%; height: 112px; object-fit: contain; }
.resource-card h3 { margin: 14px 0 6px; font-size: 15px; }
.resource-card h3 code { font-size: 13px; }
.resource-card .links { display: flex; gap: 12px; margin-top: 10px; font-size: 12px; font-weight: 700; }
.resource-card .links a { color: var(--signal-deep); text-decoration: none; }
.resource-card .links a:hover { text-decoration: underline; }
.block-card { min-height: 185px; display: flex; flex-direction: column; gap: 9px; }
.block-card .badge { align-self: flex-start; margin: 0; border: 1px solid #91b5a1; border-radius: 999px; padding: 4px 8px; background: transparent; color: var(--signal-deep); font: 700 10px/1 Consolas, "Courier New", monospace; }
.block-card p { margin: 0; font-size: 13px; line-height: 1.5; }
.block-card .links { margin-top: auto; }
.block-card .preview-link { color: var(--signal-deep); font-weight: 800; }

.cad-preview { margin: 0; border: 1px solid #274738; border-radius: 8px; background: var(--paper); box-shadow: 0 20px 42px rgba(18, 47, 32, .12); }
.cad-preview-heading { padding: 18px 20px; border-bottom-color: var(--line); background: var(--paper); }
.cad-preview-heading h2 { margin: 0 0 5px; font-size: 19px; }
.cad-preview-heading p { margin: 0; }
.cad-preview-tools button { border-color: #aac4b0; border-radius: 999px; color: var(--ink); }
.cad-preview-tools button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--signal); }
.cad-preview-workspace { grid-template-columns: 278px minmax(0, 1fr); min-height: 560px; }
.cad-template-picker { background: #e9efe9; border-right-color: var(--line); }
.cad-template-button { border-color: #c4d1c6; border-radius: 4px; background: var(--paper); }
.cad-template-button[aria-pressed="true"] { border-color: var(--signal-deep); box-shadow: inset 3px 0 var(--signal-deep); background: #dff2df; }
.cad-layer-panel, .cad-entity-panel { border-top-color: var(--line); }
.cad-layer-row:hover { background: #dce8dd; }
.cad-preview-meta { border-top-color: var(--line); background: var(--paper); }

.cad-rule-section { margin-top: 72px; }
.cad-rule-heading { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(280px, .9fr); align-items: end; gap: 34px; padding-bottom: 20px; border-bottom: 2px solid var(--ink); }
.cad-rule-heading .eyebrow { margin-bottom: 12px; }
.cad-rule-heading h2 { margin: 0; font-size: clamp(30px, 4vw, 54px); line-height: .98; }
.cad-rule-heading > p { max-width: 460px; margin: 0 0 2px; font-size: 15px; line-height: 1.55; }
.cad-rule-box { display: grid; grid-template-columns: minmax(230px, .42fr) minmax(0, 1.58fr); border: 1px solid var(--line); border-top: 0; background: var(--paper); }
.cad-rule-note { display: flex; flex-direction: column; justify-content: space-between; min-height: 100%; padding: 24px; border-right: 1px solid var(--line); background: #dff2df; }
.cad-rule-note span { color: var(--signal-deep); font: 800 11px/1 Consolas, "Courier New", monospace; }
.cad-rule-note p { margin: 28px 0 0; color: var(--ink); font-size: 15px; line-height: 1.65; }
.cad-rule-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 0; padding: 0; list-style: none; }
.cad-rule-grid li { display: grid; grid-template-columns: 32px minmax(0, 1fr); gap: 12px; min-height: 150px; padding: 22px; border-bottom: 1px solid var(--line); }
.cad-rule-grid li:nth-child(odd) { border-right: 1px solid var(--line); }
.cad-rule-grid li:nth-last-child(-n + 2) { border-bottom: 0; }
.cad-rule-index { color: var(--signal-deep); font: 800 12px/1 Consolas, "Courier New", monospace; }
.cad-rule-grid h3 { margin: 0 0 10px; color: var(--ink); font-size: 16px; }
.cad-rule-grid p { margin: 0; color: var(--ink-soft); font-size: 13px; line-height: 1.6; }
.cad-rule-grid code { color: var(--ink); font-size: 11px; }

.docs-layout { display: grid; grid-template-columns: minmax(0, 1fr) 264px; gap: 42px; margin-top: 68px; }
.content { min-width: 0; }
.panel { margin: 0 0 18px; border: 1px solid var(--line); border-radius: 0; padding: 20px; background: var(--paper); }
.panel h2 { margin: 0 0 12px; font-size: 20px; }
.endpoint { grid-template-columns: 76px minmax(0, 1fr); border-top-color: var(--line); }
.endpoint .method { color: var(--signal-deep); }
.sidebar { border: 0; border-top: 2px solid var(--ink); border-radius: 0; padding: 14px 0 0; background: transparent; }
.sidebar h2 { font-size: 16px; }
.sidebar h3 { color: var(--ink); }
.sidebar ul { color: var(--ink-soft); }
.sidebar .quick-link { border-top-color: var(--line); color: var(--signal-deep); }
pre { border-radius: 0; background: var(--ink); color: #e7f7e5; }

@keyframes flow-rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
.home-hero > *, .page-intro, .api-rail, .cad-preview { animation: flow-rise .62s both; }
.home-hero > *:nth-child(2), .api-rail { animation-delay: .08s; }

@media (max-width: 900px) {
  main { padding: 16px 20px 44px; }
  nav { grid-template-columns: 1fr auto; margin-bottom: 34px; }
  nav .nav-cluster { grid-column: 1 / -1; grid-row: 2; justify-self: stretch; overflow-x: auto; }
  nav .service-status, nav .page-context { justify-self: end; }
  .home-hero { min-height: auto; }
  .hero-visual img { height: 44vw; min-height: 260px; }
  .page-intro, .section-heading { grid-template-columns: 1fr; gap: 20px; }
  .api-rail { grid-template-columns: 1fr; }
  .cad-preview-workspace { grid-template-columns: 1fr; }
  .cad-template-picker { max-height: 250px; border-right: 0; border-bottom: 1px solid var(--line); }
  .cad-rule-heading, .cad-rule-box { grid-template-columns: 1fr; }
  .cad-rule-note { border-right: 0; border-bottom: 1px solid var(--line); }
  .docs-layout { grid-template-columns: 1fr; gap: 24px; }
  .sidebar { position: static; }
}

@media (max-width: 620px) {
  h1 { font-size: clamp(48px, 14vw, 76px); }
  nav .site-brand { font-size: 13px; }
  nav .service-status { font-size: 10px; }
  nav .page-context { font-size: 13px; }
  .signal-strip { grid-template-columns: 1fr; }
  .route-row { grid-template-columns: 1fr auto; gap: 8px 16px; }
  .route-index, .route-detail { grid-column: 1 / -1; }
  .resource-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .resource-card { min-height: 185px; padding: 12px; }
  .resource-card img { height: 82px; }
  .cad-rule-section { margin-top: 48px; }
  .cad-rule-grid { grid-template-columns: 1fr; }
  .cad-rule-grid li, .cad-rule-grid li:nth-child(odd) { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .cad-rule-grid li:last-child { border-bottom: 0; }
  .cad-preview-heading { display: block; }
  .cad-preview-tools { margin-top: 14px; }
}