:root {
  color-scheme: light;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: #f7f7f5;
  color: #222;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
}
header, main, footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
}
header {
  padding-top: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid #ddd;
}
header .brand {
  font-size: 1.25rem;
  font-weight: 600;
  color: #222;
  text-decoration: none;
}
nav a {
  margin-right: 16px;
  color: #2a5db0;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}
main {
  padding-top: 24px;
  padding-bottom: 48px;
}
h1 {
  font-size: 1.75rem;
  line-height: 1.25;
  margin: 0 0 8px;
}
h2 {
  font-size: 1.15rem;
  margin: 28px 0 8px;
}
p {
  margin: 0 0 16px;
}
ol {
  padding-left: 1.4em;
}
ol li {
  margin-bottom: 14px;
}
.effective {
  color: #555;
  margin-bottom: 24px;
}
a {
  color: #2a5db0;
}
footer {
  padding-top: 16px;
  padding-bottom: 40px;
  border-top: 1px solid #ddd;
  color: #555;
  font-size: 0.95rem;
}
footer p {
  margin: 0 0 8px;
}