:root {
  --paper: #faf8f3;
  --ink: #1a1a1a;
  --ink-soft: #3a3a3a;
  --muted: #6b665c;
  --rule: #d9d4c7;
  --accent: #8a3b12;
  --code-bg: #f1ece1;
  --serif: "Iowan Old Style", "Charter", "New York", "Palatino Linotype",
    Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
    Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 18px/1.6 var(--serif);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 32px;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
}

.site-header .wrap {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-top: 18px;
  padding-bottom: 16px;
}

.brand {
  font-size: 22px;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.site-header nav { font: 14px var(--sans); }

.site-header nav a {
  margin-left: 24px;
  color: var(--muted);
  text-decoration: none;
}

.site-header nav a:hover { color: var(--ink); }

/* Hero */

.hero { padding-top: 88px; padding-bottom: 56px; }

.kicker {
  margin: 0;
  font: 600 12px/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 20px 0 24px;
  font-size: clamp(38px, 6vw, 60px);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.02em;
}

h1 em { color: var(--accent); }

.lede {
  max-width: 660px;
  margin: 0;
  font-size: 21px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* Figures */

.figures {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule);
}

.figures > div { padding: 24px 24px 22px 0; }

.figures > div + div {
  padding-left: 24px;
  border-left: 1px solid var(--rule);
}

.figure {
  display: block;
  font-size: 40px;
  line-height: 1;
  letter-spacing: -0.02em;
}

.figures p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.45;
  color: var(--muted);
}

.note {
  max-width: 660px;
  margin: 24px 0 0;
  font-style: italic;
  color: var(--ink-soft);
}

/* Sections */

main > section { padding-top: 72px; }

h2 {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 28px;
  padding-top: 14px;
  border-top: 1px solid var(--ink);
  font-size: 30px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.num {
  font: 500 13px var(--mono);
  color: var(--accent);
}

h3 {
  margin: 0 0 8px;
  font: 600 12px/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Protocol */

.roles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.roles > div { padding: 0 24px 0 0; }

.roles > div + div {
  padding-left: 24px;
  border-left: 1px solid var(--rule);
}

.roles p, .cases p, .props dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink-soft);
}

.exhibit {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 32px;
  margin-top: 44px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
}

.exhibit ol {
  margin: 0;
  padding-left: 20px;
  font-size: 16px;
  color: var(--ink-soft);
}

.exhibit li + li { margin-top: 6px; }

.code {
  margin: 0;
  padding: 20px 22px;
  overflow-x: auto;
  background: var(--code-bg);
  border-radius: 3px;
  font: 13px/1.65 var(--mono);
  color: var(--ink);
}

.code .c { color: var(--muted); }

/* Properties */

.props {
  display: grid;
  grid-template-columns: 220px 1fr;
  margin: 0;
}

.props dt, .props dd {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}

.props dt { font-weight: 600; font-size: 17px; }

/* Use cases */

.cases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px 28px;
}

/* Policy */

.policy ul {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.policy li {
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 17px;
  color: var(--ink-soft);
}

.policy li b { color: var(--ink); font-weight: 600; }

/* Contact */

.contact {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  padding-bottom: 72px;
}

.contact > div { flex: 1; }

.contact h2 { margin-bottom: 8px; }

.contact p { margin: 0; color: var(--muted); }

.mail {
  font-size: 30px;
  letter-spacing: -0.01em;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 6px;
}

.mail:hover { color: var(--accent); }

/* Footer */

.site-footer {
  border-top: 1px solid var(--ink);
  font: 13px var(--sans);
  color: var(--muted);
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  padding-top: 20px;
  padding-bottom: 28px;
}

.site-footer a { text-decoration: none; }

/* Narrow screens */

@media (max-width: 760px) {
  body { font-size: 17px; }
  .wrap { padding: 0 20px; }
  .site-header nav a:not([href="#contact"]) { display: none; }
  .hero { padding-top: 56px; }
  .lede { font-size: 19px; }

  .figures, .roles, .cases, .exhibit { grid-template-columns: 1fr; }

  .figures > div + div, .roles > div + div {
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--rule);
  }

  .roles > div { padding: 14px 0; }
  .props { grid-template-columns: 1fr; }
  .props dt { border-bottom: 0; padding-bottom: 0; }
  .props dd { padding-top: 4px; }

  .contact { flex-direction: column; align-items: flex-start; }
  .mail { font-size: 24px; }
}