:root {
  color: #17202a;
  background: #f7f9f4;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", Arial, sans-serif;
  font-size: 18px;
  line-height: 1.55;
}

* { box-sizing: border-box; }
body { margin: 0; }
main { width: min(720px, calc(100% - 32px)); margin: 0 auto; padding: 48px 0 80px; }
header { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 48px; }
.brand { color: #000; font-size: 32px; font-weight: 700; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 16px; }
a { color: #385444; }
h1 { font-size: 40px; line-height: 1.1; margin: 0 0 16px; }
h2 { font-size: 24px; margin: 40px 0 8px; }
p, li { color: #596169; }
.meta { color: #777f85; font-size: 16px; }
.notice { border-left: 4px solid #ff9300; padding: 8px 0 8px 16px; }
footer { border-top: 1px solid #dfe4dc; margin-top: 48px; padding-top: 24px; }

@media (max-width: 560px) {
  main { padding-top: 32px; }
  header { align-items: flex-start; flex-direction: column; margin-bottom: 32px; }
  h1 { font-size: 34px; }
}