:root {
  --bg: #ffffff;
  --text: #16181d;
  --muted: #5b6270;
  --accent: #6b4cf6;
  --card: #f4f5f8;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0b0d11; --text: #e6e9ef; --muted: #8a93a3; --accent: #9d86ff; --card: #13161c; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 48px 20px 64px; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 32px; }
header img { width: 72px; height: 72px; border-radius: 16px; }
h1 { font-size: 28px; margin: 0; }
h2 { font-size: 19px; margin-top: 32px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }
nav { display: flex; gap: 16px; margin-top: 4px; font-size: 15px; }
.card { background: var(--card); border-radius: 14px; padding: 16px 20px; margin: 16px 0; }
footer { margin-top: 48px; font-size: 14px; color: var(--muted); }