:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --muted: #666;
  --bg: #fafafa;
  --accent: #2d5fa5;
}
@media (prefers-color-scheme: dark) {
  :root { --fg: #e8e8e8; --muted: #999; --bg: #161616; --accent: #7aaaff; }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

main {
  max-width: 640px;
  margin: 12vh auto 0;
  padding: 0 1.25rem;
}

h1 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

p { margin: 0.5rem 0; }
p.footnote { color: var(--muted); font-size: 0.9rem; margin-top: 2rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }