:root { color-scheme: light; }
body { font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; line-height: 1.45; margin: 0; padding: 0; }
header, main, footer { max-width: 900px; margin: 0 auto; padding: 20px; }
header { border-bottom: 1px solid #ddd; }
footer { border-top: 1px solid #ddd; font-size: 0.95rem; }
a { color: inherit; }
nav a { margin-right: 12px; }
ul { padding-left: 18px; }
.small { font-size: 0.95rem; }
.note { background: #f7f7f7; padding: 12px; border: 1px solid #e6e6e6; border-radius: 6px; }