:root {
  color-scheme: light dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #1c1c1e;
  background: #fff;
}

nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding: 1.25rem 1rem;
  border-bottom: 1px solid #e0e0e0;
}

nav a {
  color: #1c1c1e;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

nav a:hover {
  color: #0066cc;
}

section {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.25rem;
}

.hero {
  text-align: center;
  padding: 4rem 1.25rem 3rem;
}

.hero h1 {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
}

.hero p {
  font-size: 1.1rem;
  color: #4a4a4f;
  max-width: 560px;
  margin: 0 auto 2rem;
}

.btn {
  display: inline-block;
  background: #1c1c1e;
  color: #fff;
  text-decoration: none;
  padding: 0.85rem 1.75rem;
  border-radius: 0.6rem;
  font-weight: 600;
  font-size: 1rem;
}

.btn:hover {
  background: #000;
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.4rem;
}

ul {
  padding-left: 1.25rem;
}

.cta {
  text-align: center;
  background: #f5f5f7;
}

footer {
  text-align: center;
  padding: 2.5rem 1.25rem 3rem;
  color: #6e6e73;
  font-size: 0.85rem;
}

footer a {
  color: #6e6e73;
}

footer .links {
  margin-top: 0.75rem;
}

footer .links a {
  margin: 0 0.5rem;
  text-decoration: underline;
}

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

  nav {
    border-bottom-color: #2c2c2e;
  }

  nav a {
    color: #f2f2f7;
  }

  .hero p {
    color: #c7c7cc;
  }

  .btn {
    background: #f2f2f7;
    color: #000;
  }

  .btn:hover {
    background: #fff;
  }

  .cta {
    background: #1c1c1e;
  }

  footer, footer a {
    color: #8e8e93;
  }
}