:root {
  --bg: #08090a;
  --bg-soft: #0c0e10;
  --bg-card: #0f1113;
  --ink: #eceee8;
  --muted: #989c93;
  --faint: #6b6f67;
  --line: rgba(236, 238, 232, 0.10);
  --line-strong: rgba(236, 238, 232, 0.18);
  --accent: #c9f24d;
  --accent-ink: #11150a;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --wrap: 1120px;
  --radius: 2px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent); color: var(--accent-ink); }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 12px 18px;
  z-index: 100;
  font-weight: 600;
}
.skip:focus { left: 12px; top: 12px; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(8, 9, 10, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 650;
  letter-spacing: 0.14em;
  font-size: 14px;
}

.brand-mark { width: 18px; height: 18px; fill: var(--accent); }

.nav {
  display: flex;
  gap: 28px;
  margin-left: auto;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.01em;
  transition: color 140ms ease;
}
.nav a:hover { color: var(--ink); }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 22px;
  background: var(--accent);
  color: var(--accent-ink);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: transform 140ms ease, background 140ms ease, color 140ms ease;
}
.btn:hover { background: #d8ff66; transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn-ghost:hover { background: rgba(236, 238, 232, 0.06); }

.btn-small { padding: 9px 16px; font-size: 13px; }

/* ---------- hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(236, 238, 232, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(236, 238, 232, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 35%, transparent 100%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 64px;
  align-items: center;
  padding-top: 104px;
  padding-bottom: 104px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 26px;
}

.dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(201, 242, 77, 0.12);
}

h1 {
  margin: 0;
  font-size: clamp(2.6rem, 5.4vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 600;
}

.lede {
  margin: 26px 0 0;
  max-width: 34em;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}
.lede strong { color: var(--ink); font-weight: 600; }
.lede em { color: var(--ink); font-style: normal; border-bottom: 1px solid var(--line-strong); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.pillars {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  list-style: none;
  margin: 40px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
}
.pillars li { display: flex; align-items: center; gap: 8px; }
.pillars li::before { content: ""; width: 4px; height: 4px; background: var(--accent); }

/* ---------- ledger card ---------- */

.ledger-card {
  margin: 0;
  background: linear-gradient(180deg, #101315 0%, #0b0d0e 100%);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  overflow: hidden;
}

.ledger-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.ledger-title { color: var(--ink); }
.ledger-status { color: var(--accent); display: inline-flex; align-items: center; gap: 7px; }
.ledger-status::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--accent); }

.ledger {
  margin: 0;
  padding: 20px 18px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.75;
  color: #b9beb4;
}
.ledger code { font-family: inherit; }

.ledger-card figcaption {
  padding: 14px 18px 18px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 12.5px;
  line-height: 1.55;
}

/* ---------- sections ---------- */

.section {
  padding: 96px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 68px;
}

.section-index {
  margin: 0 0 20px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

h2 {
  margin: 0;
  font-size: clamp(1.9rem, 3.4vw, 2.9rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 600;
}

.section-title { max-width: 18em; }

.split {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 64px;
  align-items: start;
}

.prose p { margin: 0 0 18px; color: var(--muted); }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--ink); font-weight: 600; }

.ticks {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.ticks li {
  position: relative;
  padding-left: 26px;
  color: var(--muted);
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 12px;
  height: 1px;
  background: var(--accent);
}
.ticks strong { color: var(--ink); font-weight: 600; }

/* ---------- model cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 44px;
}

.card {
  background: var(--bg-soft);
  padding: 30px 26px 34px;
  transition: background 160ms ease;
}
.card:hover { background: var(--bg-card); }

.card h3 {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: var(--mono);
  color: var(--accent);
}

.card p { margin: 0; color: var(--muted); font-size: 15.5px; }
.card strong { color: var(--ink); }

.axes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-top: 0;
}

.axis { background: var(--bg-soft); padding: 32px 26px 34px; }

.axis-label {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
}

.axis-title {
  margin: 0 0 14px;
  font-size: 20px;
  letter-spacing: -0.02em;
  font-weight: 600;
}

.axis-copy { margin: 0; color: var(--muted); font-size: 15.5px; }

.ladder {
  list-style: none;
  counter-reset: step;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  font-family: var(--mono);
  font-size: 12px;
}
.ladder li {
  counter-increment: step;
  padding: 6px 10px;
  border: 1px solid var(--line-strong);
  color: var(--muted);
}
.ladder li::before {
  content: "0" counter(step) " ";
  color: var(--faint);
}
.ladder li:last-child { border-color: var(--accent); color: var(--ink); }

.note {
  margin: 22px 0 0;
  color: var(--faint);
  font-size: 14px;
  max-width: 62em;
}

/* ---------- tiers ---------- */

.tiers {
  list-style: none;
  margin: 48px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.tiers li {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 28px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}

.tier-name {
  font-family: var(--mono);
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.tiers li:last-child .tier-name { color: var(--accent); }

.tier-desc { color: var(--muted); font-size: 15.5px; max-width: 56em; }
.tier-desc code {
  font-family: var(--mono);
  font-size: 0.88em;
  color: var(--ink);
  background: rgba(236, 238, 232, 0.06);
  padding: 2px 6px;
}

.callout {
  display: flex;
  gap: 14px;
  margin: 34px 0 0;
  padding: 20px 22px;
  border: 1px solid var(--line-strong);
  border-left: 2px solid var(--accent);
  background: rgba(201, 242, 77, 0.03);
  color: var(--muted);
  font-size: 15.5px;
  max-width: 70em;
}
.callout-mark { color: var(--accent); font-family: var(--mono); }

/* ---------- evidence ---------- */

.evidence-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  margin-top: 44px;
  align-items: start;
}

.facts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.facts li {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
}
.facts span {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink);
  padding-top: 4px;
}

/* ---------- steps ---------- */

.steps {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}
.steps li {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 24px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}
.step-num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
  letter-spacing: 0.12em;
  padding-top: 6px;
}
.steps h3 { margin: 0 0 8px; font-size: 19px; letter-spacing: -0.01em; font-weight: 600; }
.steps p { margin: 0; color: var(--muted); font-size: 15.5px; max-width: 46em; }

/* ---------- access ---------- */

.access { background: var(--bg-soft); }

.access-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: end;
}

.access h2 { max-width: 14em; }

.lede-sm {
  margin: 20px 0 0;
  color: var(--muted);
  max-width: 34em;
  font-size: 16px;
}

.access-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-end;
}

/* ---------- footer ---------- */

.site-footer { padding: 64px 0 48px; }

.footer-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 16px 40px;
  align-items: center;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  letter-spacing: 0.14em;
  font-size: 13px;
}

.footer-note { margin: 0; color: var(--faint); font-size: 13.5px; }

.footer-links {
  display: flex;
  gap: 22px;
  font-size: 13.5px;
}
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--ink); }

.footer-legal {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 12.5px;
  font-family: var(--mono);
  letter-spacing: 0.02em;
}

/* ---------- motion ---------- */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 600ms ease, transform 600ms ease;
}
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn { transition: none; }
}

/* ---------- responsive ---------- */

@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; padding-top: 72px; padding-bottom: 72px; }
  .split { grid-template-columns: 1fr; gap: 28px; }
  .cards { grid-template-columns: 1fr; }
  .axes { grid-template-columns: 1fr; }
  .evidence-grid { grid-template-columns: 1fr; gap: 36px; }
  .access-inner { grid-template-columns: 1fr; align-items: start; }
  .access-actions { justify-content: flex-start; }
  .nav { display: none; }
  .footer-inner { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 20px; }
  .section { padding: 72px 0; }
  .tiers li { grid-template-columns: 1fr; gap: 8px; }
  .facts li { grid-template-columns: 1fr; gap: 4px; }
  .steps li { grid-template-columns: 48px 1fr; gap: 16px; }
  .header-inner { height: 60px; gap: 12px; }
  .btn-small { padding: 8px 12px; }
}