body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro", "Helvetica Neue", Helvetica, Arial, sans-serif;
  max-width: 720px;
  margin: 0 auto;
  padding: 40px 24px 80px;
  color: #1d1d1f;
  line-height: 1.55;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}
h1 {
  font-size: 32px;
  letter-spacing: -0.5px;
  margin: 0 0 8px;
}
h2 {
  font-size: 22px;
  margin: 40px 0 12px;
  letter-spacing: -0.3px;
}
h3 {
  font-size: 18px;
  margin: 28px 0 8px;
}
p, li {
  color: #424248;
}
ul, ol {
  padding-left: 22px;
}
li {
  margin-bottom: 6px;
}
.meta {
  color: #888;
  font-size: 14px;
  margin: 0 0 32px;
}
a {
  color: #0066cc;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
header {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid #e5e5e7;
}
header a {
  color: #1d1d1f;
  font-weight: 600;
}
nav a {
  margin-right: 18px;
  font-weight: 500;
}
@media (prefers-color-scheme: dark) {
  body { background: #1d1d1f; color: #f5f5f7; }
  p, li { color: #c8c8cc; }
  header { border-color: #2c2c2e; }
  header a { color: #f5f5f7; }
  a { color: #66b3ff; }
  .meta { color: #888; }
}