* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  max-width: 800px;
  margin: 0 auto;
  padding: 1.2rem;
  color: #1a1a1a;
  line-height: 1.7;
}
h1 { font-size: 1.4rem; margin-bottom: 1.2rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 0.6rem; border-bottom: 1px solid #eee; padding-bottom: 0.3rem; }
h3 { font-size: 1rem; margin: 1.2rem 0 0.3rem; }
p { margin-bottom: 0.8rem; }
a { color: #0066cc; text-decoration: none; }
a:hover { text-decoration: underline; }
blockquote {
  border-left: 3px solid #ccc;
  padding-left: 1rem;
  color: #555;
  margin: 1rem 0;
}
hr { border: none; border-top: 1px solid #eee; margin: 1.2rem 0; }
strong { font-weight: 600; }
.nav { margin-bottom: 1.5rem; font-size: 0.9rem; }
.date-list { list-style: none; }
.date-list li {
  padding: 0.6rem 0;
  border-bottom: 1px solid #eee;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.date-list li a { font-size: 1rem; }
.badge {
  font-size: 0.75rem;
  background: #f0f0f0;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: #666;
}
.footer {
  margin-top: 3rem;
  font-size: 0.8rem;
  color: #999;
  border-top: 1px solid #eee;
  padding-top: 1rem;
}
@media (prefers-color-scheme: dark) {
  body { background: #111; color: #ddd; }
  h2 { border-color: #333; }
  a { color: #6ab0ff; }
  blockquote { color: #aaa; border-color: #444; }
  hr { border-color: #333; }
  .date-list li { border-color: #2a2a2a; }
  .badge { background: #2a2a2a; color: #aaa; }
  .footer { color: #666; border-color: #2a2a2a; }
}