* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #1e293b;
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #e2e8f0;
}

header h1 {
  font-size: 2rem;
  color: #0f172a;
}

header h1 a {
  color: inherit;
  text-decoration: none;
}

header p {
  color: #64748b;
  margin-top: 0.5rem;
}

main h2 {
  font-size: 1.4rem;
  margin: 1.5rem 0 0.75rem;
  color: #0f172a;
}

main h3 {
  font-size: 1.1rem;
  margin: 1.25rem 0 0.5rem;
  color: #334155;
}

main p {
  margin-bottom: 0.75rem;
}

main ul {
  margin: 0.5rem 0 1rem 1.5rem;
}

main li {
  margin-bottom: 0.25rem;
}

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e2e8f0;
  text-align: center;
  color: #94a3b8;
  font-size: 0.875rem;
}

footer nav {
  margin-bottom: 0.5rem;
}

footer a {
  color: #64748b;
  margin: 0 0.5rem;
}

a {
  color: #2563eb;
}