body { margin: 0; background: #fff; color: #1a1a1a; font: 16px/1.6 system-ui, sans-serif; }
main { max-width: 640px; margin: 0 auto; padding: 40px 16px 56px; }
h1 { font-size: 24px; line-height: 1.3; margin: 0 0 16px; }
h2 { font-size: 17px; margin: 28px 0 8px; }
p, ul { margin: 0 0 12px; }
a { color: #0f766e; }
@media (prefers-color-scheme: dark) {
  body { background: #161616; color: #e8e8e8; }
  a { color: #5eead4; }
}