:root {
  --bg: #f7f6f3;
  --fg: #1d1f22;
  --muted: #5f6368;
  --accent: #3b5b7a;
  --line: #e2e0db;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121416;
    --fg: #ececec;
    --muted: #a0a4a8;
    --accent: #8fb3d6;
    --line: #2a2d31;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.wrap { max-width: 680px; margin: 0 auto; padding: 72px 20px 48px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
.mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), #6d8fa8);
}
h1 { font-size: 30px; letter-spacing: -0.02em; margin: 0; }
h2 { font-size: 19px; margin: 36px 0 8px; }
.lede { font-size: 21px; color: var(--fg); margin: 0 0 12px; }
p, li { color: var(--muted); }
a { color: var(--accent); }
footer {
  margin-top: 56px; padding-top: 18px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  font-size: 14px; color: var(--muted);
}
.updated { font-size: 14px; color: var(--muted); }