:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #1c1c1e;
  --muted: #6c6c70;
  --accent: #4a52f0;
  --card: #f2f2f7;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0e0f14; --text: #f2f2f7; --muted: #a1a1a6; --accent: #8f95ff; --card: #1c1d24; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 32px; }
header img { width: 64px; height: 64px; border-radius: 15px; }
header a { color: inherit; text-decoration: none; }
h1 { font-size: 32px; line-height: 1.15; margin: 0; }
h2 { font-size: 21px; margin: 36px 0 8px; }
p, li { color: var(--text); }
.lead { font-size: 20px; color: var(--muted); }
.muted { color: var(--muted); font-size: 15px; }
a { color: var(--accent); }
nav { display: flex; gap: 20px; margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--card); }
.card { background: var(--card); border-radius: 14px; padding: 16px 20px; margin: 16px 0; }
dt { font-weight: 600; margin-top: 18px; }
dd { margin: 4px 0 0; }