:root {
  --bg: #070a12;
  --bg-soft: #0b1020;
  --panel: #10172a;
  --panel-2: #131c32;
  --text: #f4f7ff;
  --muted: #aab4cc;
  --line: rgba(255, 255, 255, 0.10);
  --accent: #88e5d0;
  --accent-2: #9ca8ff;
  --warm: #f6c98b;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.28);
  --radius: 22px;
  --shell: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { max-width: 100%; }
button, input, select { font: inherit; }
.shell { width: min(calc(100% - 40px), var(--shell)); margin-inline: auto; }
.narrow { max-width: 800px; }
.skip-link { position: absolute; left: -10000px; top: auto; }
.skip-link:focus { left: 16px; top: 16px; z-index: 1000; padding: 10px 14px; background: white; color: black; border-radius: 8px; }

.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid var(--line); background: rgba(7, 10, 18, 0.88); backdrop-filter: blur(18px); }
.nav-shell { display: flex; align-items: center; justify-content: space-between; min-height: 74px; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 760; letter-spacing: -0.03em; }
.brand > span:last-child > span { color: var(--accent); }
.brand-mark { width: 32px; height: 26px; position: relative; display: inline-block; }
.brand-mark i { position: absolute; border-radius: 50%; display: block; }
.brand-mark i:nth-child(1) { width: 8px; height: 8px; left: 1px; top: 2px; background: var(--accent); }
.brand-mark i:nth-child(2) { width: 8px; height: 8px; left: 1px; bottom: 2px; background: var(--accent-2); }
.brand-mark i:nth-child(3) { width: 11px; height: 11px; right: 0; top: 7px; background: var(--text); }
.brand-mark::before, .brand-mark::after { content: ""; position: absolute; width: 17px; height: 1px; left: 8px; background: rgba(255,255,255,.42); transform-origin: left center; }
.brand-mark::before { top: 8px; transform: rotate(19deg); }
.brand-mark::after { bottom: 8px; transform: rotate(-19deg); }
.site-nav { display: flex; gap: 26px; align-items: center; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: .92rem; font-weight: 600; }
.site-nav a:hover { color: var(--text); }
.site-nav .nav-api { color: var(--text); border: 1px solid var(--line); border-radius: 999px; padding: 7px 13px; }
.nav-toggle { display: none; background: none; color: var(--text); border: 1px solid var(--line); border-radius: 9px; padding: 7px 10px; }

.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); }
.hero::before { content: ""; position: absolute; inset: -40% 42% auto -20%; height: 680px; background: radial-gradient(circle, rgba(136,229,208,.12), transparent 62%); pointer-events: none; }
.hero-grid { min-height: 710px; display: grid; grid-template-columns: 1.06fr .94fr; align-items: center; gap: 72px; padding-block: 90px; }
.eyebrow { margin: 0 0 16px; color: var(--accent); font-size: .75rem; font-weight: 800; letter-spacing: .17em; text-transform: uppercase; }
.hero h1, .page-hero h1 { margin: 0; font-size: clamp(3.2rem, 7vw, 6.4rem); line-height: .98; letter-spacing: -.065em; max-width: 850px; }
.hero h1 em { font-style: normal; color: var(--accent); }
.lede, .page-hero > .shell > p:last-child { max-width: 720px; color: var(--muted); font-size: 1.15rem; }
.lede { margin: 28px 0 0; max-width: 700px; }
.hero-actions { display: flex; gap: 12px; margin-top: 34px; flex-wrap: wrap; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 45px; padding: 0 18px; border: 1px solid transparent; border-radius: 11px; font-weight: 720; text-decoration: none; cursor: pointer; }
.button.primary { background: var(--accent); color: #07120f; }
.button.secondary { border-color: var(--line); background: rgba(255,255,255,.03); }
.hero-metrics { display: flex; gap: 30px; padding: 0; margin: 45px 0 0; }
.hero-metrics div { border-left: 1px solid var(--line); padding-left: 16px; }
.hero-metrics dt { color: var(--muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .12em; }
.hero-metrics dd { margin: 3px 0 0; font-weight: 700; font-size: .88rem; }

.semantic-visual { position: relative; min-height: 500px; border: 1px solid var(--line); border-radius: 34px; background: radial-gradient(circle at center, rgba(156,168,255,.11), transparent 42%), linear-gradient(145deg, #0c1222, #090d18); box-shadow: var(--shadow); overflow: hidden; }
.semantic-visual::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px); background-size: 36px 36px; mask-image: linear-gradient(to bottom, black, transparent 90%); }
.orbit { position: absolute; border: 1px dashed rgba(255,255,255,.14); border-radius: 50%; left: 50%; top: 50%; transform: translate(-50%, -50%); }
.orbit-one { width: 290px; height: 290px; }
.orbit-two { width: 430px; height: 430px; }
.concept-node { position: absolute; left: 50%; top: 50%; width: 185px; height: 185px; transform: translate(-50%, -50%); border-radius: 50%; background: #f4f7ff; color: #0b1020; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; box-shadow: 0 0 80px rgba(156,168,255,.25); }
.concept-node span { font-size: .64rem; letter-spacing: .18em; font-weight: 800; color: #5b6480; }
.concept-node strong { font-size: .9rem; margin-top: 4px; }
.concept-node small { color: #6d7591; margin-top: 4px; }
.expression { position: absolute; z-index: 2; padding: 10px 12px; border: 1px solid var(--line); border-radius: 12px; background: rgba(12,18,34,.92); box-shadow: 0 12px 30px rgba(0,0,0,.28); font-size: .9rem; }
.expression small { color: var(--accent); margin-left: 6px; font-weight: 800; }
.expression-a { left: 8%; top: 16%; }
.expression-b { right: 6%; top: 23%; }
.expression-c { left: 9%; bottom: 18%; }
.expression-d { right: 10%; bottom: 14%; }

.principle-strip { border-bottom: 1px solid var(--line); background: #080c16; }
.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.principle-grid article { padding: 38px 32px; border-right: 1px solid var(--line); }
.principle-grid article:first-child { border-left: 1px solid var(--line); }
.principle-grid span, .manifesto-grid article > span { color: var(--accent-2); font-size: .73rem; font-weight: 800; letter-spacing: .12em; }
.principle-grid h2 { font-size: 1.1rem; margin: 8px 0; }
.principle-grid p { margin: 0; color: var(--muted); font-size: .92rem; }

.section { padding: 100px 0; }
.section-alt { background: var(--bg-soft); border-block: 1px solid var(--line); }
.two-column, .answer-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 90px; align-items: start; }
.section-title { margin: 0; font-size: clamp(2.2rem, 5vw, 4.3rem); line-height: 1.04; letter-spacing: -.05em; }
.section-copy, .answer-copy { color: var(--muted); font-size: 1.05rem; max-width: 650px; }
.architecture-flow { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.architecture-flow li { display: grid; grid-template-columns: 100px 1fr; gap: 6px 20px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.architecture-flow span { grid-row: 1 / span 2; color: var(--accent); font-size: .75rem; letter-spacing: .1em; text-transform: uppercase; }
.architecture-flow strong { font-size: 1.05rem; }
.architecture-flow small { color: var(--muted); }
.section-heading-row { display: flex; justify-content: space-between; align-items: end; gap: 20px; margin-bottom: 34px; }
.text-link { color: var(--accent); text-decoration: none; font-weight: 700; }
.concept-card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.concept-card { min-height: 260px; padding: 25px; border: 1px solid var(--line); border-radius: var(--radius); background: rgba(255,255,255,.025); text-decoration: none; transition: transform .2s ease, border-color .2s ease; }
.concept-card:hover { transform: translateY(-3px); border-color: rgba(136,229,208,.45); }
.concept-code { color: var(--accent-2); font-size: .72rem; font-weight: 800; letter-spacing: .12em; }
.concept-card h3 { margin: 42px 0 10px; font-size: 1.25rem; }
.concept-card p { color: var(--muted); margin: 0; font-size: .92rem; }
.card-meta { display: inline-block; margin-top: 20px; color: #78849f; font-size: .72rem; }
.answer-copy p { margin-top: 0; }
.answer-copy strong { color: var(--text); }

.page-hero { padding: 120px 0 80px; border-bottom: 1px solid var(--line); background: radial-gradient(circle at 80% -10%, rgba(156,168,255,.11), transparent 36%); }
.page-hero.compact { padding-block: 90px 60px; }
.page-hero h1 { font-size: clamp(3rem, 6vw, 5.4rem); }
.page-hero .shell > p:last-child { margin-top: 24px; }
.breadcrumbs { display: flex; gap: 8px; color: var(--muted); font-size: .8rem; margin-bottom: 42px; }
.breadcrumbs a { color: var(--accent); text-decoration: none; }
.concept-title-row { display: grid; grid-template-columns: 1fr auto; gap: 50px; align-items: end; }
.definition { max-width: 760px; color: var(--muted); font-size: 1.15rem; }
.identity-panel { min-width: 220px; padding: 20px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.025); }
.identity-panel span, .identity-panel small { display: block; color: var(--muted); }
.identity-panel strong { display: block; margin: 5px 0; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--accent); }

.registry-filter { padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.registry-filter label { display: block; font-weight: 700; margin-bottom: 10px; }
.filter-row { display: grid; grid-template-columns: 1fr 180px auto; gap: 10px; }
.registry-filter input, .registry-filter select { width: 100%; min-height: 46px; border: 1px solid var(--line); border-radius: 10px; background: #090e1a; color: var(--text); padding: 0 13px; }
.registry-summary { color: var(--muted); padding: 30px 4px 12px; }
.registry-summary strong { color: var(--text); }
.registry-list { border-top: 1px solid var(--line); }
.registry-item { display: grid; grid-template-columns: 105px 1fr 150px; gap: 30px; padding: 30px 4px; border-bottom: 1px solid var(--line); }
.registry-code { color: var(--accent-2); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .82rem; }
.registry-item h2 { margin: 0; font-size: 1.3rem; }
.registry-item h2 a { text-decoration: none; }
.registry-item p { color: var(--muted); max-width: 720px; }
.registry-domain { color: #7f8aa4; font-size: .78rem; text-align: right; }
.expression-tags { display: flex; flex-wrap: wrap; gap: 7px; }
.expression-tags span { padding: 5px 8px; border: 1px solid var(--line); border-radius: 8px; color: #c5ccdd; font-size: .77rem; }
.expression-tags b { color: var(--accent); margin-right: 5px; font-size: .67rem; }
.empty-state { padding: 70px 0; text-align: center; color: var(--muted); }

.detail-grid { display: grid; grid-template-columns: 1fr 320px; gap: 70px; align-items: start; }
.detail-grid h2, .fact-panel h2 { margin-top: 0; }
.muted { color: var(--muted); }
.expression-table { border-top: 1px solid var(--line); }
.expression-row { display: grid; grid-template-columns: 60px 1fr 60px; gap: 16px; align-items: center; padding: 15px 0; border-bottom: 1px solid var(--line); }
.lang-code { color: var(--accent); text-transform: uppercase; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .78rem; }
.strength { color: var(--muted); text-align: right; font-variant-numeric: tabular-nums; }
.fact-panel { padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.fact-panel dl { margin: 0; }
.fact-panel dl div { display: flex; justify-content: space-between; gap: 20px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.fact-panel dl div:last-child { border-bottom: 0; }
.fact-panel dt { color: var(--muted); }
.fact-panel dd { margin: 0; text-align: right; }
.relation-list { margin-top: 30px; border-top: 1px solid var(--line); }
.relation-item { display: grid; grid-template-columns: 120px 120px 1fr; gap: 20px; padding: 17px 0; border-bottom: 1px solid var(--line); }
.relation-item strong { color: var(--accent-2); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.relation-item span { color: var(--muted); }
.relation-item a { text-decoration: none; color: var(--accent); }
.provenance { display: grid; grid-template-columns: .7fr 1.3fr; gap: 70px; }
.provenance h2 { margin: 0; font-size: 2rem; }
.provenance > p { color: var(--muted); }

.research-grid { display: grid; grid-template-columns: 220px 1fr; gap: 80px; }
.research-index { position: sticky; top: 110px; align-self: start; display: flex; flex-direction: column; border-left: 1px solid var(--line); }
.research-index a { text-decoration: none; color: var(--muted); padding: 7px 16px; }
.research-index a:hover { color: var(--accent); }
.research-content { max-width: 760px; }
.research-content section { padding: 10px 0 75px; }
.research-content h2 { font-size: 2.25rem; letter-spacing: -.035em; margin: 0 0 15px; }
.research-content p { color: var(--muted); }
.formula { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; padding: 20px; border: 1px solid var(--line); border-radius: 14px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; background: var(--panel); }
.formula strong { color: var(--accent); }
.metric-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 25px; padding-left: 20px; color: var(--muted); }

.manifesto-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.manifesto-grid article { padding: 32px; min-height: 250px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.manifesto-grid h2 { margin: 35px 0 10px; }
.manifesto-grid p { color: var(--muted); }
.faq-list { max-width: 850px; }
.faq-list details { border-bottom: 1px solid var(--line); padding: 21px 0; }
.faq-list summary { cursor: pointer; font-size: 1.12rem; font-weight: 750; }
.faq-list p { color: var(--muted); max-width: 760px; }

.site-footer { padding: 65px 0 30px; border-top: 1px solid var(--line); background: #060910; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 50px; }
.footer-grid > div { display: flex; flex-direction: column; gap: 7px; align-items: flex-start; }
.footer-grid p, .footer-grid a { color: var(--muted); font-size: .88rem; text-decoration: none; }
.footer-grid strong { margin-bottom: 5px; }
.footer-brand { margin-bottom: 8px; }
.legal { margin-top: 50px; padding-top: 20px; border-top: 1px solid var(--line); color: #6f7890; font-size: .75rem; }

@media (max-width: 900px) {
  .hero-grid, .two-column, .answer-grid, .detail-grid, .concept-title-row, .provenance { grid-template-columns: 1fr; }
  .hero-grid { gap: 30px; min-height: auto; }
  .semantic-visual { min-height: 460px; }
  .principle-grid { grid-template-columns: 1fr; }
  .principle-grid article { border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); }
  .concept-card-grid { grid-template-columns: repeat(2, 1fr); }
  .research-grid { grid-template-columns: 1fr; gap: 40px; }
  .research-index { position: static; flex-direction: row; flex-wrap: wrap; border-left: 0; border-bottom: 1px solid var(--line); padding-bottom: 10px; }
  .registry-item { grid-template-columns: 90px 1fr; }
  .registry-domain { display: none; }
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
}

@media (max-width: 680px) {
  .shell { width: min(calc(100% - 28px), var(--shell)); }
  .site-nav { display: none; position: absolute; top: 66px; left: 14px; right: 14px; flex-direction: column; align-items: stretch; gap: 0; padding: 10px; border: 1px solid var(--line); border-radius: 15px; background: #0b1020; box-shadow: var(--shadow); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 11px; }
  .nav-toggle { display: inline-flex; }
  .hero-grid { padding-block: 64px; }
  .hero h1 { font-size: clamp(3rem, 16vw, 5rem); }
  .hero-metrics { display: grid; grid-template-columns: 1fr; gap: 12px; }
  .semantic-visual { min-height: 400px; }
  .orbit-two { width: 340px; height: 340px; }
  .orbit-one { width: 235px; height: 235px; }
  .concept-node { width: 150px; height: 150px; }
  .expression { font-size: .75rem; }
  .section { padding: 70px 0; }
  .section-heading-row { align-items: flex-start; flex-direction: column; }
  .concept-card-grid, .manifesto-grid, .metric-list { grid-template-columns: 1fr; }
  .filter-row { grid-template-columns: 1fr; }
  .registry-item { grid-template-columns: 1fr; gap: 10px; }
  .architecture-flow li { grid-template-columns: 80px 1fr; }
  .expression-row { grid-template-columns: 48px 1fr 45px; }
  .relation-item { grid-template-columns: 1fr; gap: 5px; }
  .footer-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}