:root{font-family:system-ui,-apple-system,sans-serif;color:#17202b;background:#f4f5f7}body{margin:0;min-height:100vh;display:grid;place-items:center}main{background:#fff;padding:2.5rem;border-radius:14px;box-shadow:0 12px 35px #0001;width:min(420px,calc(100vw - 4rem))}h1{font-size:1.5rem}h2{font-size:1.1rem}p{line-height:1.55;overflow-wrap:anywhere}input,button{box-sizing:border-box;display:block;width:100%;padding:.8rem;margin:.7rem 0;border-radius:8px;border:1px solid #cbd0d7}button{background:#17202b;color:#fff;cursor:pointer}button:disabled{opacity:.5}.error{color:#9b1c1c}