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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #fafafa;
  color: #222;
  line-height: 1.6;
  padding: 2rem 1rem;
}

main { max-width: 640px; margin: 0 auto; }

header { margin-bottom: 3rem; }

h1 { font-size: 2.5rem; font-weight: 600; }
h2 { font-size: 1.25rem; margin: 2rem 0 0.75rem; font-weight: 600; }
h3 { font-size: 1.05rem; margin-bottom: 0.5rem; font-weight: 600; }

.tagline { color: #666; margin-top: 0.25rem; }

section { margin-bottom: 2rem; }
article { margin-bottom: 1.5rem; padding-bottom: 1.5rem; border-bottom: 1px solid #eee; }
article:last-child { border-bottom: none; }

a { color: #0066cc; text-decoration: none; margin-right: 1rem; }
a:hover { text-decoration: underline; }

footer { margin-top: 4rem; color: #999; font-size: 0.9rem; }

@media (prefers-color-scheme: dark) {
  body { background: #1a1a1a; color: #e0e0e0; }
  .tagline { color: #aaa; }
  article { border-color: #333; }
  a { color: #66b3ff; }
  footer { color: #777; }
}