:root {
  color-scheme: light;
  --ink: #17211c;
  --muted-ink: #536158;
  --paper: #fbfaf7;
  --band: #f1f4ef;
  --line: #cad4ca;
  --green: #2e624a;
  --blue: #315f83;
  --gold: #b98a24;
  --dark: #1d2a24;
  --white: #ffffff;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
}

a {
  color: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 16px clamp(20px, 5vw, 64px);
  border-bottom: 1px solid rgba(23, 33, 28, 0.12);
  background: rgba(251, 250, 247, 0.94);
  backdrop-filter: blur(12px);
}

.brand {
  font-weight: 760;
  text-decoration: none;
}

nav {
  display: flex;
  gap: 18px;
  color: var(--muted-ink);
  font-size: 14px;
}

nav a {
  text-decoration: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: clamp(32px, 6vw, 80px);
  align-items: center;
  min-height: 82vh;
  padding: clamp(56px, 8vw, 96px) clamp(20px, 5vw, 64px);
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--green);
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 780px;
  margin-bottom: 24px;
  font-size: clamp(42px, 7vw, 82px);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 22px;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.05;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 19px;
  line-height: 1.2;
}

.lede {
  max-width: 720px;
  color: var(--muted-ink);
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.45;
}

.claim-stack {
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 50px rgba(23, 33, 28, 0.10);
}

.stack-row {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 18px;
  align-items: center;
  min-height: 78px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.stack-row:first-child {
  padding-top: 4px;
}

.stack-row strong {
  font-size: 22px;
  line-height: 1.22;
}

.row-label {
  color: var(--muted-ink);
  font-size: 12px;
  font-weight: 760;
  text-transform: uppercase;
}

.artifact {
  color: var(--green);
}

.receipt {
  color: var(--gold);
}

.probe {
  color: var(--blue);
}

.verifier {
  color: var(--dark);
}

.field-list {
  display: grid;
  gap: 0;
  margin: 18px 0 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.field-list div {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 16px;
  padding: 13px 16px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.field-list div:last-child {
  border-bottom: 0;
}

.field-list dt {
  color: var(--ink);
  font-size: 13px;
  font-weight: 760;
}

.field-list dd {
  margin: 0;
  color: var(--muted-ink);
  font-size: 14px;
  line-height: 1.35;
}

.band {
  padding: clamp(56px, 8vw, 96px) clamp(20px, 5vw, 64px);
}

.band.muted {
  background: var(--band);
}

.container {
  max-width: 1120px;
  margin: 0 auto;
}

.two-col {
  display: grid;
  grid-template-columns: minmax(220px, 0.45fr) minmax(0, 1fr);
  gap: clamp(28px, 6vw, 72px);
}

.prose {
  color: var(--muted-ink);
  font-size: 19px;
  line-height: 1.62;
}

.prose p:last-child {
  margin-bottom: 0;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

article {
  min-height: 230px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

article p {
  color: var(--muted-ink);
  line-height: 1.55;
}

.timeline {
  display: grid;
  gap: 16px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 26px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

.timeline time {
  color: var(--green);
  font-weight: 760;
}

.timeline p {
  max-width: 760px;
  color: var(--muted-ink);
  line-height: 1.55;
}

footer {
  padding: 28px clamp(20px, 5vw, 64px);
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted-ink);
  font-size: 14px;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 820px) {
  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    flex-wrap: wrap;
  }

  .hero,
  .two-col,
  .grid.three {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .claim-stack {
    padding: 18px;
  }

  .stack-row,
  .field-list div {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .stack-row strong {
    font-size: 20px;
  }

  .timeline li {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .footer-inner {
    flex-direction: column;
  }
}