:root{color-scheme:dark}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;
place-items:center;background:#0b1016;color:#e6edf3;font:15px/1.5 system-ui,-apple-system,Segoe UI,sans-serif}
.si{width:min(360px,90vw);display:grid;gap:22px}.mark{font-size:22px;letter-spacing:.04em;font-weight:600}
form{display:grid;gap:12px}input{padding:12px 14px;border-radius:8px;border:1px solid #243142;background:#141c26;
color:inherit;font:inherit}input:focus{outline:2px solid #3bb8c4;border-color:transparent}button{padding:12px;
border:0;border-radius:8px;background:#3bb8c4;color:#061016;font:inherit;font-weight:600;cursor:pointer}
#e{min-height:1.5em;margin:0;color:#f08c3a;font-size:13px}