:root {
  --bg: #0b0d10;
  --panel: #12161b;
  --panel-2: #171c22;
  --text: #f2f4f7;
  --muted: #98a2ad;
  --line: #2a313a;
  --accent: #b8ff6a;
  --accent-soft: rgba(184, 255, 106, 0.10);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  letter-spacing: -0.01em;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  min-height: 72px;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  background: rgba(11, 13, 16, 0.86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.brand { font-weight: 800; letter-spacing: 0.12em; font-size: 16px; }
.nav { display: flex; gap: 24px; color: var(--muted); font-size: 14px; }
.pill {
  justify-self: end;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 14px;
  color: var(--muted);
  font-size: 13px;
}
.section-shell { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }

.hero {
  min-height: calc(100vh - 72px);
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 64px;
  align-items: center;
  padding-top: 76px;
  padding-bottom: 96px;
}
.eyebrow { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase; }
.hero h1 { margin: 20px 0 24px; font-size: clamp(48px, 7vw, 92px); line-height: 0.98; letter-spacing: -0.065em; font-weight: 740; }
.hero h1 span { color: var(--muted); }
.lead { max-width: 720px; font-size: clamp(19px, 2vw, 25px); color: #c6ccd4; }
.hero-actions, .spec-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border-radius: 8px; font-weight: 700; font-size: 14px; border: 1px solid var(--line); }
.button.primary { background: var(--accent); color: #0a0c0e; border-color: var(--accent); }
.button.ghost { background: transparent; color: var(--text); }

.hero-diagram { position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 560px; }
.node { width: 280px; min-height: 128px; border: 1px solid var(--line); background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01)); border-radius: 18px; padding: 24px; display: flex; flex-direction: column; justify-content: center; text-align: center; }
.node strong { font-size: 30px; letter-spacing: 0.08em; }
.node small { color: var(--muted); margin-top: 4px; }
.node-kicker { color: var(--muted); font-size: 10px; letter-spacing: 0.13em; margin-bottom: 10px; }
.persona-node { border-color: rgba(184,255,106,0.48); box-shadow: 0 0 50px rgba(184,255,106,0.08); }
.flow-line { width: 1px; height: 72px; background: linear-gradient(var(--line), var(--accent), var(--line)); }
.flow-label { position: absolute; left: calc(50% + 28px); color: var(--muted); font-size: 12px; }
.top-label { top: 175px; }
.bottom-label { bottom: 175px; }
.return-flow { position: absolute; right: 0; top: 48%; transform: rotate(90deg); color: #7d8793; font-size: 12px; letter-spacing: .08em; }

.manifesto-band { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #0e1115; }
.quote-grid { min-height: 190px; display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.quote-grid p { margin: 0; font-size: clamp(24px, 3.5vw, 48px); line-height: 1.05; letter-spacing: -0.04em; }
.quote-grid p:last-child { color: var(--accent); }

.content-section, .relation-section, .principles-section { padding: 120px 0; }
.two-col { display: grid; grid-template-columns: 0.72fr 1.28fr; gap: 80px; }
.section-number { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .16em; margin-bottom: 12px; }
h2 { margin: 0 0 32px; font-size: clamp(38px, 5vw, 64px); line-height: 1; letter-spacing: -0.05em; }
.prose { max-width: 760px; }
.prose p { margin: 0 0 24px; font-size: 19px; color: #c4cad2; }
.prose strong { color: var(--text); }
.cards.three { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 48px; }
.card { min-height: 430px; border: 1px solid var(--line); border-radius: 16px; padding: 28px; background: var(--panel); }
.accent-card { background: linear-gradient(180deg, var(--accent-soft), var(--panel)); border-color: rgba(184,255,106,0.38); }
.card-index { width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 50%; display: grid; place-items: center; color: var(--accent); font-weight: 800; }
.card h3 { font-size: 34px; margin: 72px 0 6px; letter-spacing: -0.04em; }
.card p { color: #b9c0c8; }
.card .definition { color: var(--text); font-weight: 700; }
.card ul { list-style: none; padding: 0; margin: 28px 0 0; border-top: 1px solid var(--line); }
.card li { padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--muted); }

.relation-section { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 70px; align-items: center; }
.relation-copy p { font-size: 20px; color: #b9c0c8; max-width: 520px; }
.boundary-grid { display: grid; grid-template-columns: 120px 1fr 120px; gap: 18px; align-items: center; }
.boundary-label { color: var(--muted); letter-spacing: .14em; font-size: 12px; text-align: right; }
.boundary-label.right { text-align: left; }
.boundary-core { border: 1px solid rgba(184,255,106,0.42); border-radius: 18px; padding: 24px; background: var(--accent-soft); }
.boundary-title { font-size: 22px; font-weight: 800; letter-spacing: .1em; margin-bottom: 16px; }
.boundary-item { display: flex; justify-content: space-between; gap: 20px; padding: 14px 0; border-top: 1px solid rgba(255,255,255,.09); }
.boundary-item span { color: var(--accent); }
.boundary-item b { font-weight: 600; }

.continuity-section { padding: 120px 0; background: #0f1317; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-lead { max-width: 760px; color: #b7bec7; font-size: 20px; }
.continuity-flow { display: grid; grid-template-columns: 1fr auto 1.5fr auto 1fr; align-items: center; gap: 18px; margin-top: 56px; }
.model-box, .continuity-box { border: 1px solid var(--line); border-radius: 16px; padding: 24px; min-height: 160px; display: flex; flex-direction: column; justify-content: center; background: var(--panel); }
.model-box { font-size: 24px; font-weight: 800; }
.model-box small { margin-top: 10px; color: var(--muted); font-size: 12px; font-weight: 500; }
.continuity-box { border-color: rgba(184,255,106,.35); display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 14px; }
.continuity-box strong { grid-column: 1/-1; margin-bottom: 8px; color: var(--accent); }
.continuity-box span { color: #c4cad2; font-size: 14px; }
.arrow { color: var(--accent); font-size: 26px; }
.continuity-note { margin-top: 24px; color: var(--muted); font-size: 14px; }

.principles-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 44px; }
.principles-grid blockquote { margin: 0; min-height: 180px; display: flex; align-items: flex-end; padding: 26px; border: 1px solid var(--line); background: var(--panel); border-radius: 16px; font-size: 23px; line-height: 1.25; letter-spacing: -0.03em; }
.principles-grid blockquote:nth-child(2) { border-color: rgba(184,255,106,.32); }
.big-rule { color: var(--text)!important; font-size: 34px!important; line-height: 1.12; letter-spacing: -0.04em; }
.prior-list { margin-top: 38px; border-top: 1px solid var(--line); }
.prior-list div { display: grid; grid-template-columns: 180px 1fr; gap: 20px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.prior-list span { color: var(--muted); }

.spec-section { border-top: 1px solid var(--line); background: linear-gradient(180deg, rgba(184,255,106,.06), transparent); }
.spec-inner { min-height: 420px; display: grid; grid-template-columns: 1.35fr .65fr; gap: 70px; align-items: center; }
.spec-inner h2 { font-size: clamp(38px, 4.8vw, 62px); }
.spec-inner p { color: #b7bec7; max-width: 740px; font-size: 18px; }
.spec-actions { align-self: center; justify-content: flex-end; }

.site-footer { min-height: 220px; padding-top: 60px; padding-bottom: 60px; display: flex; align-items: flex-end; justify-content: space-between; border-top: 1px solid var(--line); }
.footer-brand { font-size: 18px; font-weight: 900; letter-spacing: .14em; }
.site-footer p { color: var(--muted); margin: 8px 0 0; }
.footer-meta { display: flex; gap: 20px; color: var(--muted); font-size: 13px; flex-wrap: wrap; justify-content: flex-end; }

.doc-main { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; display: grid; grid-template-columns: 340px 1fr; gap: 80px; padding: 100px 0 120px; }
.doc-aside { position: sticky; top: 120px; align-self: start; }
.doc-aside h1 { font-size: 48px; line-height: 1; letter-spacing: -0.05em; margin: 16px 0; }
.doc-aside p { color: var(--muted); }
.doc-content { max-width: 760px; }
.doc-content section { padding: 0 0 72px; }
.doc-content h2 { font-size: 38px; margin-bottom: 24px; }
.doc-content p { color: #c3c9d1; font-size: 18px; }
.spec-grid { display: grid; grid-template-columns: 1fr; gap: 12px; }
.spec-grid > div { padding: 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.spec-grid b { display: block; font-size: 24px; }
.spec-grid span { color: var(--accent); font-size: 13px; }
.spec-grid p { margin-bottom: 0; font-size: 16px; }
.code-block { padding: 24px; overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: #080a0d; color: #dfe4ea; line-height: 1.6; }
.doc-list { padding-left: 22px; color: #c3c9d1; }
.doc-list li { margin: 10px 0; }
.draft-box { padding: 26px!important; border: 1px solid rgba(184,255,106,.36); border-radius: 14px; background: var(--accent-soft); margin-bottom: 72px; }
.draft-box p { margin-bottom: 0; color: var(--text); }

@media (max-width: 920px) {
  .site-header { grid-template-columns: 1fr auto; }
  .nav { display: none; }
  .hero, .two-col, .relation-section, .spec-inner, .doc-main { grid-template-columns: 1fr; }
  .hero { min-height: auto; }
  .hero-diagram { min-height: 520px; }
  .cards.three { grid-template-columns: 1fr; }
  .card { min-height: auto; }
  .card h3 { margin-top: 32px; }
  .quote-grid { grid-template-columns: 1fr; padding-top: 44px; padding-bottom: 44px; }
  .continuity-flow { grid-template-columns: 1fr; }
  .arrow { transform: rotate(90deg); text-align: center; }
  .principles-grid { grid-template-columns: 1fr; }
  .boundary-grid { grid-template-columns: 80px 1fr 80px; }
  .doc-aside { position: static; }
}

@media (max-width: 620px) {
  .section-shell, .doc-main { width: min(100% - 28px, var(--max)); }
  .site-header { padding: 0 14px; }
  .pill { display: none; }
  .hero { padding-top: 56px; }
  .hero h1 { font-size: 48px; }
  .hero-diagram { transform: scale(.9); transform-origin: center; }
  .content-section, .relation-section, .principles-section, .continuity-section { padding-top: 82px; padding-bottom: 82px; }
  .boundary-grid { grid-template-columns: 1fr; }
  .boundary-label, .boundary-label.right { text-align: left; }
  .prior-list div { grid-template-columns: 1fr; gap: 4px; }
  .site-footer { align-items: flex-start; flex-direction: column; gap: 40px; }
  .footer-meta { justify-content: flex-start; }
}