body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  max-width: 760px;
  margin: 24px auto;
  line-height: 1.6;
  color: #222;
  padding: 0 16px;
}
a { color: #0366d6; text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header { border-bottom: 1px solid #eee; margin-bottom: 18px; padding-bottom: 8px; }
.site-header h1 { margin: 0; font-size: 28px; }
.site-desc { margin: 4px 0 0; color: #666; font-size: 14px; }
.content { padding-top: 12px; }
.site-footer { border-top: 1px solid #eee; margin-top: 28px; padding-top: 12px; color: #666; font-size: 13px; }