:root {
  --paper: oklch(0.955 0.018 84);
  --paper-deep: oklch(0.913 0.025 83);
  --ink: oklch(0.205 0.01 67);
  --muted: oklch(0.49 0.025 70);
  --rule: oklch(0.73 0.022 75);
  --rust: oklch(0.58 0.16 37);
  --rust-dark: oklch(0.43 0.13 35);
  --pine: oklch(0.38 0.07 167);
  --code: oklch(0.17 0.01 65);
  --code-text: oklch(0.91 0.02 84);
  --page: clamp(20px, 5vw, 72px);
  --section: clamp(64px, 9vw, 118px);
  --radius-sm: 4px;
  --radius-md: 8px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent calc(100% - 1px), color-mix(in oklch, var(--rule), transparent 75%) 1px) 0 0 / 8.333% 100%,
    var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Noto Sans SC", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-underline-offset: 0.22em; }
a:focus-visible { outline: 3px solid var(--rust); outline-offset: 4px; }

.skip-link {
  position: fixed;
  z-index: 10;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  color: var(--paper);
  background: var(--ink);
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

.site-header,
main,
footer {
  width: min(100%, 1600px);
  margin-inline: auto;
  padding-inline: var(--page);
}

.site-header {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  display: grid;
  min-height: 40px;
  align-content: center;
  text-decoration: none;
  font-family: "Arial Narrow", "Aptos Narrow", sans-serif;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.012em;
}

.wordmark small,
.eyebrow,
.index,
.small-label,
.evidence,
.step-number,
.verify-output {
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-variant-numeric: tabular-nums;
}

.wordmark small {
  margin-top: 5px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.site-header nav,
footer nav {
  display: flex;
  gap: clamp(14px, 3vw, 36px);
  align-items: center;
}

.site-header nav a,
footer nav a {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.hero {
  min-height: min(790px, calc(100vh - 86px));
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  align-items: center;
  column-gap: 24px;
  padding-block: var(--section);
  border-bottom: 1px solid var(--rule);
}

.hero-copy { grid-column: 1 / span 7; }
.evidence { grid-column: 9 / -1; align-self: end; }

.eyebrow,
.index {
  margin: 0 0 18px;
  color: var(--rust-dark);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p { text-wrap: pretty; }

h1,
h2 { font-family: "Songti SC", "Noto Serif SC", Georgia, serif; }

h1 {
  margin: 0;
  max-width: none;
  font-size: clamp(64px, 9vw, 132px);
  font-weight: 700;
  line-height: 0.98;
  text-wrap: balance;
}

.lede {
  max-width: 38em;
  margin: 36px 0 0;
  color: var(--muted);
  font-size: clamp(18px, 1.6vw, 22px);
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 36px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  gap: 18px;
  padding: 10px 18px;
  color: var(--paper);
  background: var(--rust-dark);
  border-radius: var(--radius-sm);
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms cubic-bezier(0.16, 1, 0.3, 1), background-color 160ms ease;
}

.button:active { transform: scale(0.96); }
.text-link { min-height: 44px; display: inline-flex; align-items: center; }

.evidence {
  padding-top: 14px;
  border-top: 3px solid var(--ink);
  font-size: 13px;
}

.evidence-head,
.evidence dl div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
}

.evidence-head {
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  color: var(--muted);
  text-transform: uppercase;
}

.status { color: var(--pine); font-weight: 700; }
.status i { display: inline-block; width: 7px; height: 7px; margin-right: 6px; background: var(--pine); border-radius: 50%; }
.evidence dl { margin: 0; }
.evidence dl div { padding: 15px 0; border-bottom: 1px solid var(--rule); }
.evidence dt { color: var(--muted); }
.evidence dd { margin: 0; font-weight: 700; }
.evidence > p { margin: 14px 0 0; color: var(--muted); font-size: 11px; }

.section {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  column-gap: 24px;
  padding-block: var(--section);
  border-bottom: 1px solid var(--rule);
}

.section-intro { grid-column: 1 / span 4; }
.section-intro h2 {
  margin: 0;
  font-size: clamp(38px, 4vw, 64px);
  line-height: 1.05;
  text-wrap: balance;
}
.section-intro > p:last-child { max-width: 30em; color: var(--muted); }

.step-rail {
  grid-column: 6 / -1;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink);
}

.step-rail li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 20px;
  padding: 26px 0 34px;
  border-bottom: 1px solid var(--rule);
}

.step-number { color: var(--rust-dark); font-size: 12px; }
.step-body h3 { margin: -4px 0 16px; font-size: 22px; line-height: 1.3; }

pre {
  max-width: 100%;
  margin: 0;
  overflow-x: auto;
  padding: 18px;
  color: var(--code-text);
  background: var(--code);
  border-radius: var(--radius-sm);
  font: 13px/1.7 ui-monospace, "SFMono-Regular", Consolas, monospace;
  white-space: pre;
}

.note { margin: 14px 0 0; color: var(--muted); font-size: 14px; }
.note code, blockquote code { padding: 0.1em 0.3em; background: var(--paper-deep); }

.agent-layout {
  grid-column: 6 / -1;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 40px;
}

.headers { display: grid; align-content: start; gap: 10px; }
.headers code { display: block; padding: 13px 0; border-bottom: 1px solid var(--rule); font-size: 13px; overflow-wrap: anywhere; }
.small-label { margin: 16px 0 0; color: var(--rust-dark); font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; }

blockquote { margin: 0; padding: 28px; background: var(--paper-deep); border-radius: var(--radius-md); }
blockquote p { margin: 0; font: 22px/1.65 "Songti SC", "Noto Serif SC", serif; }
blockquote cite { display: block; margin-top: 22px; color: var(--muted); font-size: 12px; font-style: normal; }
.inline-doc { grid-column: 6 / -1; width: fit-content; min-height: 44px; display: inline-flex; align-items: center; margin-top: 28px; }

.contract-list {
  grid-column: 6 / -1;
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink);
}

.contract-list li {
  display: grid;
  grid-template-columns: 48px minmax(120px, 0.75fr) 1.5fr;
  gap: 20px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
}

.contract-list li > span { color: var(--rust-dark); font: 11px ui-monospace, monospace; }
.contract-list p { margin: 0; color: var(--muted); }

.verify-output {
  grid-column: 6 / -1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px 28px;
  padding: 28px;
  color: var(--code-text);
  background: var(--code);
  border-radius: var(--radius-md);
  font-size: 14px;
}
.verify-output strong { color: oklch(0.82 0.09 159); }
.doc-links {
  grid-column: 6 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-top: 28px;
}
.doc-links a { min-height: 40px; display: inline-flex; align-items: center; }

footer {
  min-height: 180px;
  display: flex;
  justify-content: space-between;
  gap: 32px;
  align-items: center;
}
footer p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }

@media (hover: hover) {
  .site-header nav a:hover,
  footer nav a:hover { color: var(--rust-dark); }
  .button:hover { background: var(--rust); }
}

@media (max-width: 840px) {
  body { background: var(--paper); }
  .site-header { align-items: flex-start; padding-block: 20px; }
  .site-header nav { gap: 14px; flex-wrap: wrap; justify-content: flex-end; }
  .site-header nav a { font-size: 13px; }
  .hero { min-height: auto; row-gap: 64px; }
  .hero-copy, .evidence, .section-intro, .step-rail, .agent-layout, .inline-doc, .contract-list, .verify-output, .doc-links { grid-column: 1 / -1; }
  .evidence { max-width: 560px; }
  .section { row-gap: 48px; }
}

@media (max-width: 560px) {
  :root { --page: 18px; --section: 66px; }
  body { font-size: 16px; }
  .site-header { min-height: 76px; }
  .wordmark small { display: none; }
  .site-header nav { display: block; flex: 0 0 auto; margin-left: auto; }
  .site-header nav a { display: none; }
  .site-header nav a:last-child { display: inline-flex; }
  .hero { padding-top: 76px; }
  h1 { font-size: clamp(58px, 19vw, 86px); }
  .lede { margin-top: 28px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 10px; }
  .text-link { width: fit-content; }
  .step-rail li { grid-template-columns: 34px 1fr; gap: 12px; }
  pre { margin-left: -46px; font-size: 12px; }
  .agent-layout { grid-template-columns: 1fr; }
  blockquote { padding: 22px; }
  blockquote p { font-size: 19px; }
  .contract-list li { grid-template-columns: 34px 1fr; gap: 10px 12px; }
  .contract-list li p { grid-column: 2; }
  .verify-output { grid-template-columns: 1fr; gap: 5px; }
  .verify-output strong + span { margin-top: 14px; }
  footer { align-items: flex-start; flex-direction: column; padding-block: 46px; }
  footer nav { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}