:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  color: #1a1a1a;
  background: #fafafa;
}
header {
  padding: 12px 20px;
  background: #111;
  color: #fff;
}
header a { color: #fff; text-decoration: none; font-weight: 600; letter-spacing: .3px; }
main { max-width: 980px; margin: 0 auto; padding: 20px; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.15rem; margin-top: 1.5rem; }
ul { padding-left: 1.2rem; }
li { margin: .3rem 0; }
a { color: #0b66c3; }
pre { background: #f0f0f0; padding: 10px; border-radius: 6px; overflow: auto; }
code { background: #eee; padding: 1px 5px; border-radius: 4px; }