:root {
  color-scheme: light;
  --ink: #173a33;
  --muted: #667b76;
  --line: #dce5e2;
  --paper: #f5f7f5;
  --card: #ffffff;
  --accent: #087f70;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}
header, main, footer { width: min(760px, calc(100% - 32px)); margin-inline: auto; }
header { padding: 48px 0 24px; }
.brand { color: var(--accent); font-size: 15px; font-weight: 750; letter-spacing: .02em; text-decoration: none; }
h1 { margin: 20px 0 8px; font-size: clamp(34px, 8vw, 56px); line-height: 1.05; letter-spacing: -.04em; }
.lede { color: var(--muted); font-size: 18px; }
main { background: var(--card); border: 1px solid var(--line); border-radius: 24px; padding: clamp(24px, 6vw, 48px); }
h2 { margin: 36px 0 8px; font-size: 22px; letter-spacing: -.02em; }
h2:first-child { margin-top: 0; }
p, li { color: #35534c; }
a { color: var(--accent); }
nav { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 28px; }
nav a { font-weight: 650; text-decoration: none; }
footer { padding: 28px 0 56px; color: var(--muted); font-size: 14px; }
.callout { background: #edf7f4; border-radius: 16px; padding: 18px; }
@media (max-width: 520px) { header { padding-top: 32px; } main { border-radius: 18px; } }