@import url("https://fonts.googleapis.com/css2?family=Instrument+Sans:wght@400;500;600;700&display=swap");

:root {
  --ground: #f3f4f6;
  --surface: #e7e9ee;
  --ink: #111318;
  --ink-soft: #3d424d;
  --accent: #1f4fd8;
  --accent-ink: #ffffff;
  --measure: 68ch;
  --margin: clamp(16px, 4vw, 48px);
  --font: "Instrument Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #0f1115;
    --surface: #1a1d24;
    --ink: #eef0f4;
    --ink-soft: #b9bec9;
    --accent: #7ea2ff;
    --accent-ink: #0f1115;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font);
  font-size: 18px;
  line-height: 1.55;
}

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 20px var(--margin);
}
.wordmark { white-space: nowrap; font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.bar nav { display: flex; gap: 20px; flex-wrap: wrap; font-size: 16px; }
.bar nav a { color: var(--ink); text-decoration: none; }
.bar nav a:hover, .bar nav a[aria-current="page"] { text-decoration: underline; }

main { padding: 0 var(--margin); }

/* Home */
.hero {
  min-height: 72vh;
  display: grid;
  align-content: center;
  gap: 32px;
  padding: 96px 0 120px;
  max-width: 1200px;
}
.hero h1 {
  margin: 0;
  font-size: clamp(48px, 9vw, 132px);
  line-height: 0.95;
  letter-spacing: -0.04em;
  font-weight: 700;
}
.hero p { margin: 0; max-width: 40ch; font-size: clamp(20px, 2.2vw, 28px); line-height: 1.35; }
.button {
  display: inline-block;
  justify-self: start;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 16px 28px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 150ms ease;
}
.button:hover { transform: translateY(-2px); text-decoration: none; }
.button:active { transform: translateY(0); }

.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 48px;
  padding: 72px 0 160px;
  max-width: 1200px;
}
.facts h2 { margin: 0 0 12px; font-size: 28px; line-height: 1.15; letter-spacing: -0.02em; }
.facts p { margin: 0; }

/* Documents */
.doc {
  display: grid;
  grid-template-columns: minmax(200px, 260px) minmax(0, var(--measure));
  gap: 64px;
  padding: 48px 0 160px;
}
.doc header { grid-column: 1 / -1; }
.doc h1 { margin: 0 0 12px; font-size: clamp(40px, 6vw, 72px); line-height: 1; letter-spacing: -0.035em; }
.doc .updated { margin: 0; color: var(--ink-soft); font-size: 16px; }
.toc { position: sticky; top: 24px; align-self: start; font-size: 16px; }
.toc p { margin: 0 0 12px; font-weight: 600; }
.toc ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.toc a { color: var(--ink-soft); text-decoration: none; }
.toc a:hover { color: var(--ink); text-decoration: underline; }
.body h2 { margin: 56px 0 12px; font-size: 26px; line-height: 1.2; letter-spacing: -0.015em; scroll-margin-top: 24px; }
.body h2:first-child { margin-top: 0; }
.body h3 { margin: 28px 0 8px; font-size: 20px; }
.body p, .body li { max-width: var(--measure); }
.body ul { padding-left: 1.2em; }
.body li { margin: 6px 0; }
.box { background: var(--surface); padding: 24px 28px; margin: 24px 0; }
.box p:first-child { margin-top: 0; }
.box p:last-child { margin-bottom: 0; }

footer {
  background: var(--surface);
  padding: 64px var(--margin) 40px;
  display: grid;
  gap: 32px;
}
footer .name { margin: 0; font-size: clamp(40px, 8vw, 112px); font-weight: 700; letter-spacing: -0.04em; line-height: 0.95; }
footer .cols { display: flex; flex-wrap: wrap; gap: 24px 64px; font-size: 16px; }
footer .cols p { margin: 0; }
footer .cols a { color: var(--ink); }
footer .credit { font-size: 14px; color: var(--ink-soft); }
footer .credit a { color: var(--ink-soft); }

@media (max-width: 860px) {
  .doc { grid-template-columns: 1fr; gap: 32px; }
  .toc { position: static; background: var(--surface); padding: 20px 24px; }
  .hero { min-height: 0; padding: 64px 0 96px; }
}