body{font-family:Arial,sans-serif;background:#f5f5f5;margin:0;padding:2rem;display:flex;justify-content:center}.container{background:#fff;padding:2rem;border-radius:8px;box-shadow:0 2px 8px #0000001a;max-width:400px;width:100%}label{display:block;margin-bottom:1rem}input{width:100%;padding:.5rem;margin-top:.3rem;box-sizing:border-box}button{width:100%;padding:.7rem;margin-top:1rem;background:#ff9800;color:#fff;border:none;border-radius:4px;cursor:pointer}button:hover{background:#e68900}.result{margin-top:1.5rem;font-size:1.2rem;font-weight:700}