body { font-family: system-ui, sans-serif; max-width: 42rem; margin: 2rem auto; padding: 0 1rem; line-height: 1.5; color: #1a1a1a; background: #fafafa; }
header { border-bottom: 1px solid #e0e0e0; padding-bottom: 0.75rem; margin-bottom: 1.5rem; }
header nav a { margin-right: 1rem; color: #333; text-decoration: none; }
header nav a:hover { text-decoration: underline; }
footer { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid #e0e0e0; color: #666; font-size: 0.9rem; }
article.note { margin-bottom: 2rem; }
article.note h2 { font-size: 1.1rem; margin-bottom: 0.5rem; }