:root {
  color-scheme: light dark;
  --bg: #f7f5f2;
  --fg: #1f2937;
  --muted: #6b7280;
  --accent: #1d4ed8;
  --card: #ffffff;
  --border: #e5e7eb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --accent: #93c5fd;
    --card: #111827;
    --border: #1f2937;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main {
  max-width: 46rem;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}
article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.5rem;
}
h1 { font-size: 1.6rem; line-height: 1.25; margin-top: 0; }
h2 { font-size: 1.15rem; margin-top: 2rem; }
a { color: var(--accent); }
nav { margin-bottom: 1rem; font-size: 0.9rem; }
nav a { margin-right: 1rem; }
.muted { color: var(--muted); font-size: 0.9rem; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 0.5rem; border-bottom: 1px solid var(--border); vertical-align: top; }
button {
  font: inherit;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
}