:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --accent: #0a66d8;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111113; --text: #f2f2f7; --muted: #a1a1a6; --line: #2c2c2e; --accent: #5aa2ff; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 16px; }
header {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 20px;
  padding-top: 20px; padding-bottom: 16px; border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; margin-right: auto; }
nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--text); }
main { padding-top: 8px; padding-bottom: 32px; }
h1 { font-size: 32px; line-height: 1.2; margin: 24px 0 8px; }
h2 { font-size: 22px; margin: 32px 0 8px; }
h3 { font-size: 18px; margin: 24px 0 4px; }
a { color: var(--accent); overflow-wrap: anywhere; }
ul { padding-left: 22px; }
code { font-size: 15px; }
footer { color: var(--muted); font-size: 14px; padding-top: 16px; padding-bottom: 32px; border-top: 1px solid var(--line); }