:root {
  color-scheme: light;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.2;
  color: #111;
  background: #fff;
}

main {
  max-width: 680px;
  padding: 36px 18px;
  margin: 0 auto;
}

h1 {
  font-size: 1.4rem;
  margin: 0 0 0.25rem;
  font-weight: 600;
}

.lead {
  font-size: 1.05rem;
  margin: 0 0 1.5rem;
  color: #333;
}

h2 {
  margin-top: 1.75rem;
  margin-bottom: 0.4rem;
  font-size: 1rem;
  font-weight: 600;
}

h3 {
  margin: 0.6rem 0 0.3rem;
  font-size: 0.95rem;
  font-weight: 600;
}

p {
  margin: 0.4rem 0 0.8rem;
}

ul {
  padding-left: 1.1rem;
  margin: 0.4rem 0 0.9rem;
}

li {
  margin-bottom: 0.25rem;
}

.cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 720px) {
  .cols {
    grid-template-columns: 1fr 1fr;
  }
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

footer {
  margin-top: 2.25rem;
  font-size: 0.85rem;
  color: #555;
}