body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;line-height:1.4;padding:16px;}
.container{max-width:800px;margin:0 auto;}
input{margin:6px;}
button{margin:6px;padding:8px 12px;border-radius:6px;}
pre{background:#f7f7f7;padding:12px;border-radius:6px;}