:root {
  --bg: #f6f3ee;
  --surface: #ffffff;
  --text: #16181d;
  --muted: #5b6270;
  --accent: #1f4ed8;
  --line: #e4ded3;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1116;
    --surface: #171c24;
    --text: #f3f5f7;
    --muted: #9aa4b2;
    --accent: #7aa2ff;
    --line: #262d38;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 56px 20px 72px; }
header { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 12px; margin-bottom: 40px; }
.brand { font-weight: 800; letter-spacing: -0.02em; font-size: 22px; text-decoration: none; color: var(--text); }
nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 15px; }
nav a:hover, a { color: var(--accent); }
h1 { font-size: 34px; line-height: 1.2; letter-spacing: -0.02em; margin: 0 0 12px; }
h2 { font-size: 20px; margin: 36px 0 8px; }
.lead { color: var(--muted); font-size: 19px; margin: 0 0 28px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 22px 24px; margin: 18px 0; }
ul { padding-left: 22px; }
footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }