:root {
  --paper: #f2f2ef;
  --white: #ffffff;
  --ink: #0b0b0b;
  --muted: #686864;
  --line: #c9c9c3;
  --signal: #2453ff;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --serif: ui-serif, "Iowan Old Style", Baskerville, "Times New Roman", serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Monaco, Consolas, monospace;
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--paper); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
body { min-height: 100dvh; margin: 0; background: var(--paper); }
a { color: inherit; }
a:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }

.site-header { position: fixed; z-index: 10; inset: 0 0 auto; height: 64px; display: grid; grid-template-columns: 1fr auto; align-items: center; padding: 0 32px; border-bottom: 1px solid var(--ink); background: var(--paper); }
.brand { font-size: 15px; font-weight: 760; letter-spacing: -.02em; text-decoration: none; }
.site-header p { margin: 0; color: var(--muted); font: 600 10px/1 var(--mono); letter-spacing: .05em; }
.site-header p span { margin: 0 9px; color: var(--ink); }

main { display: grid; grid-template-columns: minmax(220px, .7fr) minmax(0, 2fr); gap: clamp(52px, 8vw, 140px); max-width: 1260px; margin: 0 auto; padding: 132px 32px 112px; }
.index-card { position: sticky; top: 104px; align-self: start; padding-top: 14px; border-top: 1px solid var(--ink); }
.index-card > p { margin: 0; font: 650 9px/1 var(--mono); letter-spacing: .07em; }
.index-card > strong { display: inline-block; margin-top: 44px; font-size: clamp(76px, 10vw, 136px); font-weight: 680; line-height: .75; letter-spacing: -.095em; }
.index-card > span { margin-left: 5px; font: italic 400 31px/1 var(--serif); }
.index-card dl { margin: 54px 0 0; border-top: 1px solid var(--ink); }
.index-card dl div { min-height: 42px; display: flex; align-items: center; justify-content: space-between; gap: 16px; border-bottom: 1px solid var(--line); }
.index-card dt, .index-card dd { margin: 0; font: 600 9px/1 var(--mono); letter-spacing: .04em; }
.index-card dt { color: var(--muted); }

article { min-width: 0; }
.eyebrow { margin: 0 0 24px; font: 650 10px/1 var(--mono); letter-spacing: .07em; }
h1 { max-width: 900px; margin: 0; font-size: clamp(54px, 6.8vw, 94px); font-weight: 650; line-height: .89; letter-spacing: -.07em; }
h1 em { font-family: var(--serif); font-weight: 400; letter-spacing: -.05em; }
.summary { max-width: 760px; margin: 40px 0 76px; color: #3f3f3c; font-size: clamp(17px, 1.7vw, 21px); line-height: 1.55; letter-spacing: -.012em; }
section { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 38px; padding: 28px 0 34px; border-top: 1px solid var(--ink); }
h2 { margin: 0; font-size: 12px; line-height: 1.35; font-weight: 670; }
h2 span { display: block; margin-bottom: 12px; color: var(--signal); font: 700 9px/1 var(--mono); }
section p { margin: 0; color: #41413e; font-size: 15px; line-height: 1.7; }
code { padding: 2px 4px; background: #e1e1dc; font: 550 12px/1 var(--mono); }
.back { display: inline-flex; min-height: 44px; align-items: center; margin-top: 34px; color: var(--signal); font: 600 11px/1 var(--mono); text-underline-offset: 5px; }

footer { position: fixed; z-index: 9; inset: auto 0 0; height: 40px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; padding: 0 32px; border-top: 1px solid var(--ink); background: var(--paper); color: var(--muted); font: 600 9px/1 var(--mono); letter-spacing: .05em; }
footer a { min-height: 40px; display: flex; align-items: center; padding: 0 18px; border-right: 1px solid var(--ink); border-left: 1px solid var(--ink); color: var(--ink); text-decoration: none; }
footer span:last-child { justify-self: end; }

@media (max-width: 760px) {
  .site-header { height: 56px; padding: 0 16px; }
  .site-header p { display: none; }
  main { grid-template-columns: 1fr; gap: 64px; padding: 100px 16px 84px; }
  .index-card { position: relative; top: auto; }
  .index-card > strong { font-size: 112px; }
  h1 { font-size: clamp(46px, 13vw, 68px); }
  .summary { margin: 32px 0 58px; font-size: 17px; }
  section { grid-template-columns: 1fr; gap: 16px; }
  h2 span { display: inline; margin: 0 12px 0 0; }
  footer { padding: 0 16px; grid-template-columns: 1fr auto; }
  footer span:last-child { display: none; }
  footer a { border-right: 0; }
}

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; } }