:root {
  --ink: #1c1c1e;
  --muted: #6e6e73;
  --bg: #fff;
  --bg-alt: #f2f2f7;
  --brand: #305f66;
  --rule: rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f2f7;
    --muted: #98989d;
    --bg: #0b0b0b;
    --bg-alt: #1c1c1e;
    --rule: rgba(255, 255, 255, 0.08);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text',
               'Helvetica Neue', Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  padding: 32px 20px 80px;
  max-width: 680px;
  margin: 0 auto;
}

header {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 32px;
}

header a.home {
  color: var(--brand);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

h1 {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 16px 0 8px;
}

.last-updated {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 28px;
}

h2 {
  font-size: 20px;
  font-weight: 700;
  margin: 32px 0 12px;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 24px 0 8px;
}

p, li {
  color: var(--ink);
}

p { margin: 12px 0; }

ul { padding-left: 22px; margin: 12px 0; }
li { margin: 6px 0; }

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

.contact-block {
  background: var(--bg-alt);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 15px;
}

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 13px;
}

footer a { color: var(--muted); margin-right: 16px; }