:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
  background: #f7faf8;
  color: #16231d;
}
body { margin: 0; }
main { max-width: 780px; margin: 0 auto; padding: 32px 20px 64px; }
article { background: #fff; border: 1px solid #e5ebe7; border-radius: 18px; padding: 28px; }
h1 { margin-top: 0; }
h2 { margin-top: 30px; }
a { color: #147a52; }
.nav { display: flex; flex-wrap: wrap; gap: 12px; margin: 20px 0; }
.nav a { padding: 9px 13px; border-radius: 10px; background: #def7eb; text-decoration: none; }
.meta { color: #65736c; }
table { width: 100%; border-collapse: collapse; }
th, td { border: 1px solid #dce5e0; padding: 10px; text-align: left; vertical-align: top; }
@media (prefers-color-scheme: dark) {
  :root { background: #101713; color: #e9f1ed; }
  article { background: #16231d; border-color: #314038; }
  .nav a { background: #214936; color: #b9f5d8; }
  .meta { color: #a9b6af; }
  th, td { border-color: #405047; }
}