body{margin:0;background:#f4f6f9;color:#182238;font:17px/1.6 system-ui,sans-serif}main{max-width:720px;margin:8vh auto;padding:32px;background:white;border-radius:12px}header{display:flex;justify-content:space-between;border-bottom:1px solid #ddd;padding-bottom:16px}header span{font-size:14px;color:#566}h1{line-height:1.2}a{color:#194db1}nav{display:flex;gap:24px}aside{padding:12px;background:#fff3d6;margin:20px 0;font-size:14px}label,input{display:block}input{box-sizing:border-box;width:100%;max-width:420px;padding:12px;margin:8px 0 16px}button{padding:10px 18px;background:#194db1;color:white;border:0;border-radius:6px;cursor:pointer}form{margin:24px 0}[role=alert]{color:#a01626}