:root {
  color-scheme: light dark;
  --bg: #f9f9f7;
  --text: #0b0b0b;
  --muted: #52514e;
  --rule: #e1e0d9;
  --link: #256abf;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0d0d0d; --text: #f0efec; --muted: #c3c2b7; --rule: #2c2c2a; --link: #6da7ec; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 20px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
header img { width: 56px; height: 56px; border-radius: 50%; }
h1 { font-size: 28px; line-height: 1.2; margin: 0; }
.sub { color: var(--muted); margin: 2px 0 0; font-size: 15px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
a { color: var(--link); }
ul { padding-left: 22px; }
li { margin: 4px 0; }
footer { margin-top: 40px; padding-top: 16px; border-top: 1px solid var(--rule); color: var(--muted); font-size: 14px; }