:root {
  --bg: #fbfaf7;
  --ink: #15201c;
  --muted: #5a6761;
  --line: #e4e1d8;
  --accent: #1f6f5c;
  --accent-ink: #ffffff;
  --max: 64rem;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { font-size: 17px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
}
a { color: var(--accent); text-underline-offset: 0.15em; }
a:hover { color: var(--ink); }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1rem; }
header.top { border-bottom: 1px solid var(--line); background: #fff; }
header.top .wrap { display: flex; align-items: center; justify-content: space-between; min-height: 4rem; gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 700; letter-spacing: -0.01em; color: var(--ink); text-decoration: none; }
.brand .mark { width: 2rem; height: 2rem; border-radius: 0.5rem; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font-weight: 800; }
nav a { margin-left: 1.25rem; color: var(--muted); text-decoration: none; font-size: 0.95rem; }
nav a:hover { color: var(--ink); }
.hero { padding: 4rem 0 2.5rem; }
.hero h1 { font-size: clamp(2rem, 4.5vw, 3.1rem); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 1rem; max-width: 22ch; }
.hero p.lead { font-size: 1.2rem; color: var(--muted); max-width: 56ch; margin: 0; }
section { padding: 2rem 0; border-top: 1px solid var(--line); }
section h2 { font-size: 1.35rem; letter-spacing: -0.01em; margin: 0 0 0.75rem; }
.grid { display: grid; gap: 1.25rem; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); }
.card { background: #fff; border: 1px solid var(--line); border-radius: 0.75rem; padding: 1.25rem; }
.card h3 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); }
dl { display: grid; grid-template-columns: max-content 1fr; gap: 0.35rem 1.25rem; margin: 0; }
dt { color: var(--muted); }
dd { margin: 0; }
.prose { max-width: 70ch; }
.prose h2 { margin-top: 2rem; }
.prose ul { padding-left: 1.2rem; }
footer.bottom { border-top: 1px solid var(--line); padding: 2rem 0 3rem; color: var(--muted); font-size: 0.92rem; }
footer.bottom .wrap { display: flex; flex-wrap: wrap; gap: 0.5rem 2rem; justify-content: space-between; }
@media (max-width: 40rem) {
  dl { grid-template-columns: 1fr; gap: 0.1rem; }
  dt { margin-top: 0.6rem; }
  nav a { margin-left: 0.9rem; }
}