:root {
  --bg: #F3F5F9;
  --card: #FFFFFF;
  --text: #0F172A;
  --muted: #5B6679;
  --primary: #1E3A8A;
  --accent: #D97706;
  --border: #DDE3EC;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0B1120;
    --card: #131B2E;
    --text: #E5E9F2;
    --muted: #94A0B8;
    --primary: #7C9CFF;
    --accent: #FBBF24;
    --border: #243049;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 24px 16px 48px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
}

.brand {
  margin: 0;
  color: var(--primary);
  font-weight: 800;
  letter-spacing: 3px;
  font-size: 14px;
}

h1 { margin: 6px 0 4px; font-size: 28px; line-height: 1.25; }
h2 { margin: 28px 0 8px; font-size: 19px; color: var(--primary); }
.meta { margin: 0 0 20px; color: var(--muted); font-size: 14px; }
a { color: var(--primary); }
ul, ol { padding-left: 22px; }
li { margin: 6px 0; }
.nav { margin-top: 32px; padding-top: 16px; border-top: 1px solid var(--border); font-size: 14px; }