:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #555555;
  --accent: #0b5cad;
  --card: #f4f6f8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111315;
    --fg: #f2f2f2;
    --muted: #b8b8b8;
    --accent: #7fb8f0;
    --card: #1c1f22;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 1.0625rem/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main {
  max-width: 36rem;
  margin: 0 auto;
  padding: 2.5rem 1rem 3rem;
}
.brand {
  margin: 0 0 1.5rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.02em;
}
h1 { font-size: 1.6rem; line-height: 1.25; margin: 0 0 1rem; }
h2 { font-size: 1.15rem; margin: 0 0 0.4rem; }
.lead { font-size: 1.125rem; }
section {
  background: var(--card);
  border-radius: 0.75rem;
  padding: 1rem 1.1rem;
  margin: 1.25rem 0;
}
section p { margin: 0; }
.small { font-size: 0.95rem; color: var(--muted); }