:root {
  --bg: #fbfaf7;
  --ink: #1d1c1a;
  --muted: #5f5b54;
  --line: #e4e0d8;
  --accent: #1f4d3a;
  --accent-ink: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161513;
    --ink: #f1eee8;
    --muted: #a9a49b;
    --line: #2c2a26;
    --accent: #6fbf95;
    --accent-ink: #0f1a15;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main, header, footer { max-width: 680px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 40px; }
header a.brand { color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: .01em; }
header nav { float: right; }
header nav a { color: var(--muted); text-decoration: none; margin-left: 18px; }
header nav a:hover { color: var(--ink); }
h1 { font-size: 2.1rem; line-height: 1.15; margin: 56px 0 8px; letter-spacing: -.01em; }
h2 { font-size: 1.25rem; margin: 40px 0 8px; }
p.lead { font-size: 1.25rem; color: var(--muted); margin: 0 0 32px; }
p, li { margin: 0 0 14px; }
ul { padding-left: 22px; }
a { color: var(--accent); }
.cta {
  display: inline-block; background: var(--accent); color: var(--accent-ink);
  padding: 12px 18px; border-radius: 8px; text-decoration: none; font-weight: 600;
}
.card { border: 1px solid var(--line); border-radius: 10px; padding: 18px 20px; margin: 24px 0; }
.small { font-size: .92rem; color: var(--muted); }
footer { border-top: 1px solid var(--line); margin-top: 64px; padding: 24px 16px 48px; color: var(--muted); font-size: .9rem; }
footer p { margin: 0 0 8px; }
code { font: .95em ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }