body {
  font-family: system-ui, -apple-system, sans-serif;
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
  line-height: 1.6;
  color: #1a1a1a;
  background: #fff;
}
header { margin-bottom: 2rem; }
h1 { font-size: 3rem; margin-bottom: 0; }
.tagline { font-size: 1.25rem; color: #444; }
.btn {
  display: inline-block;
  padding: 8px 20px;
  margin-right: 8px;
  border-radius: 6px;
  background: #1a1a1a;
  color: #fff;
  text-decoration: none;
}
pre {
  background: #f4f4f4;
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
}
code { font-size: 0.9em; }
footer { margin-top: 3rem; color: #666; font-size: 0.9rem; }