:root {
  --navy: #0B1F3A;
  --red: #E31E24;
  --bg: #F2F4F7;
  --card: #FFFFFF;
  --text: #1C1C1E;
  --muted: #6B7280;
  --link: #0B1F3A;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1C1C1E;
    --text: #F2F2F7;
    --muted: #9CA3AF;
    --link: #5B8AE6;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 720px;
  margin: 32px auto;
  padding: 28px 24px;
  background: var(--card);
  border-radius: 20px;
}

@media (max-width: 760px) {
  main { margin: 0; border-radius: 0; padding: 24px 16px; }
}

h1 {
  margin: 0 0 8px;
  font-size: 32px;
  color: var(--navy);
  border-bottom: 3px solid var(--red);
  display: inline-block;
  padding-bottom: 4px;
}

@media (prefers-color-scheme: dark) {
  h1 { color: var(--text); }
}

h2 { font-size: 20px; margin: 28px 0 6px; }
a { color: var(--link); }
.lead { font-size: 19px; }
.muted { color: var(--muted); font-size: 15px; }