:root {
  --text: #1a1f2b;
  --muted: #5b6472;
  --accent: #2456c8;
  --rule: #e4e7ec;
  --bg: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

header {
  border-bottom: 1px solid var(--rule);
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

header .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
}

.brand {
  font-weight: 650;
  text-decoration: none;
  color: var(--text);
  font-size: 1.05rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1.25rem;
  font-size: 0.95rem;
}

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

main { padding: 2.5rem 0 3.5rem; }

h1 { font-size: 1.75rem; margin: 0 0 0.25rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 0.5rem; }

.effective {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

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

ul { padding-left: 1.35rem; }
li { margin: 0.3rem 0; }

.callout {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 6px;
  padding: 0.9rem 1.1rem;
  margin: 1.25rem 0;
  background: #f8fafc;
}

footer {
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.9rem;
}

footer .wrap {
  padding-top: 1.25rem;
  padding-bottom: 1.5rem;
}

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