:root {
  color-scheme: dark;
  --bg: #000000;
  --surface: #151a23;
  --text: #f3f5f9;
  --muted: #97a1b2;
  --accent: #5b8cff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px 0;
}
.brand { font-weight: 800; font-size: 22px; color: var(--text); text-decoration: none; letter-spacing: -0.3px; }
nav { display: flex; gap: 18px; }
nav a { color: var(--muted); text-decoration: none; font-weight: 600; }
nav a[aria-current="page"] { color: var(--text); }
main { max-width: 720px; margin: 0 auto; padding: 24px 16px 48px; }
h1 { font-size: 36px; letter-spacing: -0.5px; margin: 12px 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li, dd { color: var(--text); }
.lead { font-size: 19px; color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }
ol, ul { padding-left: 22px; }
dl { background: var(--surface); border-radius: 16px; padding: 8px 20px; }
dt { font-weight: 700; margin-top: 14px; }
dd { margin: 4px 0 14px; color: var(--muted); }
footer { max-width: 720px; margin: 0 auto; padding: 0 16px 40px; color: var(--muted); font-size: 14px; }
footer a { color: var(--muted); }