* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: system-ui, sans-serif; line-height: 1.6; max-width: 800px; margin: 0 auto; padding: 2rem; }
nav { margin-bottom: 2rem; }
nav a { margin-right: 1rem; }
footer { margin-top: 3rem; border-top: 1px solid #ccc; padding-top: 1rem; color: #666; }