*{box-sizing:border-box}body{margin:0;font-family:Arial,sans-serif;background:#f4f6f9;color:#1f2937}.auth{max-width:420px;margin:8vh auto;padding:30px;background:white;border-radius:10px;box-shadow:0 2px 12px #0002}h1{margin:0;color:#1f2937}h2{font-size:20px}.subtitulo{color:#64748b;line-height:1.5}label{display:block;margin:18px 0 6px;font-weight:bold}input,button{width:100%;padding:12px;font:inherit;border-radius:6px}input{border:1px solid #cbd5e1}button{border:0;margin-top:20px;background:#2563eb;color:white;cursor:pointer;font-weight:bold}button:disabled{opacity:.6}.secundario{background:#475569}#mensaje{color:#b91c1c;min-height:22px;line-height:1.4}@media(max-width:460px){.auth{margin:25px 15px}}