:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5b5b5b;
  --accent: #0d6efd;
  --border: #e5e5e5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #eaeaea;
    --muted: #a3a3a3;
    --accent: #6ea8fe;
    --border: #2a2d33;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem max(1.25rem, calc(50% - 340px));
}

header a {
  color: var(--fg);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

h1 {
  font-size: 1.6rem;
  margin-bottom: 0.25rem;
}

.effective-date {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

h2 {
  font-size: 1.15rem;
  margin-top: 2rem;
}

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

ul {
  padding-left: 1.25rem;
}

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

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem max(1.25rem, calc(50% - 340px));
  color: var(--muted);
  font-size: 0.85rem;
}

footer a {
  color: var(--muted);
}

code {
  background: rgba(128,128,128,0.12);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.9em;
}