:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666;
  --rule: #e5e5e5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.5;
}

main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

header {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2rem;
  margin-bottom: 2rem;
}

h1 {
  font-size: 2rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
}

.tagline {
  color: var(--muted);
  margin: 0;
}

h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 2rem 0 0.5rem 0;
}

section p {
  margin: 0;
}