:root{font-family:system-ui,Segoe UI,Roboto,sans-serif;line-height:1.6}
body{max-width:42rem;margin:3rem auto;padding:0 1rem;color:#222}
header h1{margin-bottom:.2rem}nav{font-size:.9rem;color:#666}
footer{margin-top:3rem;color:#999;font-size:.85rem}a{color:#36c}