:root {
  color-scheme: light dark;
  --bg: #f7f7f3;
  --fg: #11120f;
  --muted: #67695f;
  --line: #d8d9d2;
  --soft: #eeefe9;
  --accent: #11120f;
  --max: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11120f;
    --fg: #f2f3ec;
    --muted: #a9ab9f;
    --line: #34362f;
    --soft: #1b1d18;
    --accent: #f2f3ec;
  }
}

* {
  box-sizing: border-box;
}

html {
  font-family: ui-monospace, "SFMono-Regular", "Cascadia Code", "Roboto Mono",
    "Liberation Mono", Menlo, Consolas, monospace;
  background: var(--bg);
  color: var(--fg);
}

body {
  margin: 0;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

.shell {
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-weight: 700;
  letter-spacing: -0.02em;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.88rem;
}

main {
  padding: 72px 0 64px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.83rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(2.6rem, 8vw, 5.8rem);
  line-height: 0.94;
  letter-spacing: -0.075em;
}

h2 {
  margin: 48px 0 16px;
  font-size: 1.12rem;
  letter-spacing: -0.03em;
}

p, li {
  line-height: 1.72;
}

.lede {
  max-width: 62ch;
  margin: 30px 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.rule {
  margin: 56px 0 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-top: 24px;
  border: 1px solid var(--line);
  background: var(--line);
}

.cell {
  min-height: 150px;
  padding: 20px;
  background: var(--bg);
}

.cell strong {
  display: block;
  margin-bottom: 12px;
}

.meta {
  color: var(--muted);
  font-size: 0.9rem;
}

.notice {
  margin: 24px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  background: var(--soft);
  line-height: 1.65;
}

.flow {
  margin: 26px 0;
  padding: 22px;
  border: 1px solid var(--line);
  background: var(--soft);
  white-space: pre-wrap;
  overflow-x: auto;
  line-height: 1.65;
}

ul {
  padding-left: 1.2rem;
}

footer {
  padding: 22px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 620px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  main {
    padding-top: 48px;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}