body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial;padding:24px}.container{max-width:900px;margin:0 auto}.card{margin:12px 0;padding:12px;border:1px solid #eee;border-radius:8px}input{padding:8px;margin:6px 0;width:100%}button{padding:8px 12px;margin-top:8px}pre{background:#f7f7f7;padding:8px}