body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;line-height:1.5;margin:0;padding:0 1rem;}
header,footer{max-width:960px;margin:0 auto;padding:1rem 0;}
main{max-width:960px;margin:0 auto;padding:1rem 0;}
nav a{margin-right:1rem;text-decoration:none;color:#2563eb}
nav a:hover{text-decoration:underline}