:root {
  --bg: #fbfaf7;
  --fg: #1d2125;
  --muted: #6b7178;
  --line: #e4e1da;
  --accent: #0b5cad;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181b;
    --fg: #e7e5e0;
    --muted: #9aa0a6;
    --line: #2b3035;
    --accent: #79b4f2;
  }
}

body {
  max-width: 42rem;
  margin: 0 auto;
  padding: 0 1.25rem;
  background: var(--bg);
  color: var(--fg);
  font: 1.0625rem/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent); }

header {
  display: flex;
  justify-content: space-between;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}
header a { color: var(--fg); font-weight: 600; text-decoration: none; }

h1 { font-size: 2rem; line-height: 1.2; margin: 2.5rem 0 1rem; }
h2 { font-size: 1.3rem; margin-top: 2.25rem; }

/* Rule pages: "## 1." becomes a big number */
.guidelines h2 { font-size: 2.25rem; line-height: 1; color: var(--accent); margin: 2.25rem 0 .5rem; }

.pdf {
  display: inline-block;
  margin-top: 2rem;
  padding: .5rem 1rem;
  border: 1px solid var(--accent);
  border-radius: .4rem;
  text-decoration: none;
}

footer {
  margin: 3rem 0 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .875rem;
}
footer a { color: inherit; }