* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.65;
  color: #1f2328;
  background: #fafafa;
}

header {
  background: #111;
  color: #fff;
  padding: 18px 16px;
}

header .inner, main, footer {
  max-width: 780px;
  margin: 0 auto;
}

header a { color: #fff; text-decoration: none; font-weight: 700; font-size: 1.2rem; }
header nav { float: right; }
header nav a { font-weight: 400; font-size: 0.95rem; margin-left: 16px; opacity: 0.85; }
header nav a:hover { opacity: 1; }

main {
  background: #fff;
  padding: 32px 24px 48px;
  margin-top: 24px;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
}

h1 { margin-top: 0; font-size: 2rem; }
h2 { margin-top: 2rem; font-size: 1.3rem; border-bottom: 1px solid #eee; padding-bottom: 4px; }
.updated { color: #666; font-size: 0.9rem; }
a { color: #6b3df5; }
ul { padding-left: 1.3rem; }
.notice { background: #fff6e0; border-left: 4px solid #f0a500; padding: 12px 16px; margin: 20px 0; }

footer {
  text-align: center;
  color: #777;
  font-size: 0.85rem;
  padding: 24px 16px 40px;
}
footer a { color: #777; margin: 0 8px; }

@media (max-width: 600px) {
  header nav { float: none; margin-top: 8px; }
  header nav a { margin: 0 16px 0 0; }
  main { margin-top: 0; border-radius: 0; border-left: 0; border-right: 0; padding: 24px 16px 40px; }
  h1 { font-size: 1.6rem; }
}