:root {
  --bg: #ffffff;
  --text: #1f2328;
  --muted: #59636e;
  --accent: #6c3bd1;
  --rule: #d1d9e0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --text: #e6edf3;
    --muted: #9198a1;
    --accent: #a78bfa;
    --rule: #30363d;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
header { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
header img { width: 40px; height: 40px; }
header a { color: var(--text); text-decoration: none; font-weight: 600; font-size: 20px; }
nav { display: flex; gap: 16px; margin-bottom: 32px; border-bottom: 1px solid var(--rule); padding-bottom: 12px; }
nav a, main a { color: var(--accent); }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
.muted { color: var(--muted); }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--rule); color: var(--muted); font-size: 14px; }