:root {
  color-scheme: light dark;
  --bg: #f6f7fb;
  --panel: #ffffff;
  --text: #14161f;
  --muted: #5b6070;
  --accent: #4c46d6;
  --line: #e2e5ee;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0e1a;
    --panel: #131828;
    --text: #eef0f6;
    --muted: #a2a9bd;
    --accent: #9b95ff;
    --line: #232941;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}
.wrap { width: min(760px, calc(100% - 40px)); margin: 0 auto; }
header {
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  position: sticky;
  top: 0;
}
header .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: baseline;
  padding: 14px 0;
}
.brand { font-weight: 700; font-size: 19px; margin: 0; }
nav { display: flex; gap: 18px; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a.active, nav a:hover { color: var(--accent); }
main { padding: 8px 0 56px; }
h1 { font-size: 32px; line-height: 1.2; margin: 32px 0 8px; }
h2 { font-size: 23px; margin: 36px 0 8px; }
h3 { font-size: 19px; margin: 28px 0 6px; }
p, ul { margin: 12px 0; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
a { color: var(--accent); }
hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
strong { font-weight: 650; }
footer {
  border-top: 1px solid var(--line);
  background: var(--panel);
  padding: 20px 0;
  color: var(--muted);
  font-size: 14px;
}
footer p { margin: 0; }