:root{color:#1a1a1a;background:#f7f7f8;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}*{box-sizing:border-box}body{min-height:100vh;margin:0}main{max-width:800px;margin:0 auto;padding:2rem}h1,h2,h3{margin-top:0}label{margin-bottom:.75rem;display:block}label span{margin-bottom:.25rem;font-weight:600;display:block}input{width:100%;font:inherit;border:1px solid #c4c4c4;border-radius:4px;padding:.5rem}button{color:#fff;font:inherit;cursor:pointer;background:#2a4d8f;border:0;border-radius:4px;padding:.6rem 1rem}button:disabled{opacity:.6;cursor:not-allowed}.error{color:#b00020;margin-top:.5rem}