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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #1d1d1f;
  max-width: 640px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid #e5e5e5;
}

.app-icon {
  width: 128px;
  height: 128px;
  margin-bottom: 1rem;
}

.app-icon-small {
  width: 64px;
  height: 64px;
  margin-bottom: 0.5rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

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

.tagline {
  font-size: 1.1rem;
  color: #6e6e73;
}

main h2 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

main h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

main h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 1.25rem;
  margin-bottom: 0.25rem;
}

p {
  margin-bottom: 0.75rem;
}

ul, ol {
  margin-left: 1.5rem;
  margin-bottom: 0.75rem;
}

li {
  margin-bottom: 0.4rem;
}

a {
  color: #0066cc;
}

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e5e5e5;
  color: #6e6e73;
  font-size: 0.9rem;
}

footer a {
  color: #6e6e73;
}

@media (prefers-color-scheme: dark) {
  body {
    background: #1d1d1f;
    color: #f5f5f7;
  }

  header, footer {
    border-color: #333;
  }

  .tagline, footer, footer a {
    color: #a1a1a6;
  }

  a {
    color: #2997ff;
  }
}