:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #233344;
  background: #f5f8fa;
  line-height: 1.85;
}
* { box-sizing: border-box; }
body { margin: 0; overflow-wrap: anywhere; }
header, nav, main, footer { max-width: 860px; margin: auto; padding: 20px 24px; }
header { padding-top: 40px; }
header p { margin: 4px 0 0; }
.brand { color: #163f5b; font-size: 1.6rem; font-weight: 750; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 12px 24px; }
a { color: #145a85; text-underline-offset: 4px; }
a:hover { color: #092f4b; }
a:focus-visible { outline: 3px solid #145a85; outline-offset: 5px; }
main { background: white; border: 1px solid #dfe7ed; border-radius: 16px; }
h1 { font-size: clamp(1.45rem, 5vw, 2rem); line-height: 1.5; margin-top: 8px; }
h2 { font-size: 1.2rem; margin-top: 0; }
h3 { font-size: 1.05rem; }
section { margin: 28px 0; }
li { margin-bottom: 10px; }
.document { white-space: pre-wrap; }
.links { padding-left: 24px; }
.links p { margin-top: 4px; }
aside { background: #fff8e6; border-left: 4px solid #956500; padding: 8px 20px; }
.button { display: inline-block; background: #145a85; color: white; padding: 12px 20px; border-radius: 8px; }
.button:hover { background: #092f4b; color: white; }
footer { font-size: .9rem; padding-bottom: 40px; }
footer p { margin: 4px 0; }
@media (max-width: 600px) {
  header, nav, main, footer { padding-left: 18px; padding-right: 18px; }
  main { border-radius: 0; border-left: none; border-right: none; }
}