:root {
  color-scheme: light dark;
  --accent: #fa4f4a;
  --muted: #6b6b73;
}
@media (prefers-color-scheme: dark) {
  :root { --muted: #a1a1aa; }
}
body {
  margin: 0;
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
}
main {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 22px 64px;
}
header { text-align: center; margin-bottom: 28px; }
header img { border-radius: 16px; }
h1 { font-size: 30px; margin: 14px 0 4px; }
h2 { font-size: 21px; margin-top: 32px; }
h3 { font-size: 17px; margin: 22px 0 4px; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.small { font-size: 14px; }