:root {
  color-scheme: light dark;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  color: #1c1c1e;
  background: #f2f2f7;
  margin: 0;
  padding: 24px 16px 48px;
}

main {
  max-width: 680px;
  margin: 0 auto;
  background: #fff;
  border-radius: 16px;
  padding: 28px 24px 32px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  body {
    background: #000;
    color: #f2f2f7;
  }

  main {
    background: #1c1c1e;
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
  }

  a {
    color: #6eb6ff;
  }
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}

p, li {
  font-size: 1rem;
  margin: 0.5rem 0;
}

.tagline {
  color: #636366;
  font-size: 1.05rem;
  margin-bottom: 1.25rem;
}

@media (prefers-color-scheme: dark) {
  .tagline {
    color: #aeaeb2;
  }
}

a {
  color: #007aff;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  padding-left: 1.25rem;
}

.back {
  margin-bottom: 0.5rem;
}

footer {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(60, 60, 67, 0.12);
  color: #636366;
  font-size: 0.9rem;
}

@media (prefers-color-scheme: dark) {
  footer {
    border-top-color: rgba(255, 255, 255, 0.12);
    color: #aeaeb2;
  }
}