:root { color-scheme: light; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f5f5f4;
  color: #1c1c1c;
  line-height: 1.6;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}
.back {
  display: inline-block;
  margin-bottom: 24px;
  font-size: 0.85rem;
  color: #6b6b6b;
  text-decoration: none;
}
.back:hover { color: #1c1c1c; }
h1 { font-size: 1.6rem; margin: 0 0 6px; }
.updated { font-size: 0.85rem; color: #6b6b6b; margin: 0 0 32px; }
h2 { font-size: 1.1rem; margin: 32px 0 10px; }
p, li { font-size: 0.95rem; color: #2a2a2a; }
ul, ol { padding-left: 22px; }
li { margin-bottom: 6px; }
a { color: #1c1c1c; }
.callout {
  background: #fff;
  border: 1px solid #e2e2e0;
  border-radius: 10px;
  padding: 18px 20px;
  margin: 20px 0;
  font-size: 0.9rem;
}