:root { color-scheme: light dark; }
body { font-family: -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
       max-width: 760px; margin: 0 auto; padding: 48px 24px 96px;
       line-height: 1.6; color: #1c1c1e; background: #fff; }
@media (prefers-color-scheme: dark) {
  body { color: #f2f2f7; background: #111; }
  a { color: #6db8ff; }
  .card { background: #1b1b1f !important; }
}
header { text-align: center; margin-bottom: 40px; }
h1 { font-size: 2.1em; margin: .2em 0; }
h2 { margin-top: 1.8em; font-size: 1.2em; }
.tag { color: #777; }
nav { text-align: center; margin: 18px 0 34px; }
nav a { margin: 0 12px; text-decoration: none; font-weight: 600; }
.card { background: #f5f5f7; border-radius: 14px; padding: 18px 22px; margin: 14px 0; }
footer { margin-top: 64px; font-size: .85em; color: #888; text-align: center; }
ul { padding-left: 1.2em; }
code { background: rgba(128,128,128,.15); padding: 2px 6px; border-radius: 6px; }