body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 20px 80px;
  line-height: 1.65;
  color: #1a1a1a;
}
h1 { font-size: 1.8em; margin-bottom: 0.1em; }
h2 { font-size: 1.25em; margin-top: 2em; border-bottom: 1px solid #eee; padding-bottom: 0.3em; }
h3 { font-size: 1.05em; margin-top: 1.4em; }
.updated { color: #777; font-size: 0.9em; margin-bottom: 2em; }
a { color: #2E8B57; }
ul { padding-left: 1.3em; }
li { margin: 0.4em 0; }
.back { display: inline-block; margin-bottom: 1.5em; color: #777; text-decoration: none; font-size: 0.9em; }
.back:hover { color: #2E8B57; }
strong { font-weight: 700; }
footer { margin-top: 3em; color: #999; font-size: 0.85em; }