*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 1.25rem clamp(1rem, 4vw, 2rem) 2rem;
  font-family: system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.55;
  color: #1a1a1a;
  background: #fafafa;
}

.site-header {
  max-width: 40rem;
  margin: 0 auto 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #ccc;
}

.site-header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
}

.subtitle {
  margin: 0.35rem 0 0;
  font-size: 1rem;
  color: #444;
}

main {
  max-width: 40rem;
  margin: 0 auto;
}

.meta {
  margin: 0 0 1.5rem;
  font-size: 0.9rem;
  color: #555;
}

section {
  margin-bottom: 1.75rem;
}

section h2 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
}

section p {
  margin: 0;
}

section p + p {
  margin-top: 0.75rem;
}

main a {
  color: #0b57d0;
}

main a:hover {
  text-decoration: underline;
}

.placeholder {
  color: #666;
  font-style: italic;
}

.site-footer {
  max-width: 40rem;
  margin: 2.5rem auto 0;
  padding-top: 1rem;
  border-top: 1px solid #ddd;
  color: #666;
}

.site-footer p {
  margin: 0;
}

@media (prefers-color-scheme: dark) {
  body {
    color: #e8e8e8;
    background: #121212;
  }

  .subtitle,
  .meta,
  .placeholder,
  .site-footer {
    color: #a8a8a8;
  }

  .site-header {
    border-bottom-color: #333;
  }

  .site-footer {
    border-top-color: #333;
  }

  main a {
    color: #8ab4ff;
  }
}