:root { color-scheme: light dark; }
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
  background: #fff; color: #0a0a0a;
  max-width: 640px; margin: 0 auto; padding: 48px 24px 96px;
  line-height: 1.55;
}
@media (prefers-color-scheme: dark) {
  body { background: #000; color: #f4f4f4; }
  .muted { color: rgba(244,244,244,0.55); }
  hr { border-color: rgba(244,244,244,0.14); }
}
.mark { width: 44px; height: 44px; display: block; margin-bottom: 18px; }
h1 { font-weight: 200; font-size: 40px; letter-spacing: 0.5px; margin-bottom: 4px; }
h2 { font-weight: 500; font-size: 16px; margin: 32px 0 8px; }
p, li { font-size: 15px; margin-bottom: 10px; }
ul { padding-left: 20px; }
.muted { color: rgba(10,10,10,0.42); }
hr { border: none; border-top: 1px solid rgba(10,10,10,0.12); margin: 32px 0; }
a { color: inherit; }
strong { font-weight: 600; }