:root {
  --ink: #111213;
  --muted: #71767c;
  --border: rgba(0, 0, 0, 0.08);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 640px; margin: 0 auto; padding: 48px 24px 96px; }
header.site { max-width: 640px; margin: 0 auto; padding: 28px 24px 0; }
header.site a { font-weight: 700; font-size: 17px; letter-spacing: -0.3px; color: var(--ink); text-decoration: none; }
header.site a span { color: var(--muted); font-weight: 500; }
h1 { font-size: 28px; letter-spacing: -0.5px; margin: 28px 0 4px; }
.date { color: var(--muted); font-size: 13px; margin-bottom: 32px; }
h2 { font-size: 17px; letter-spacing: -0.2px; margin: 32px 0 8px; }
p, li { font-size: 15px; margin-bottom: 12px; }
ul { padding-left: 22px; margin-bottom: 12px; }
a { color: var(--ink); }
.card {
  border: 1px solid var(--border); border-radius: 16px;
  padding: 18px 20px; margin: 16px 0;
}
footer { max-width: 640px; margin: 0 auto; padding: 0 24px 48px; color: var(--muted); font-size: 13px; }
footer a { color: var(--muted); margin-right: 14px; }