:root{--fundo:#f4f5f7;--texto:#1c2230;--suave:#5b6475;--marca:#1f4fd8;--cartao:#fff}
@media (prefers-color-scheme:dark){:root{--fundo:#11141a;--texto:#e8ebf1;--suave:#9aa3b5;--marca:#6d8eff;--cartao:#1a1f28}}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--fundo);color:var(--texto);font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;padding:16px}
.cartao{background:var(--cartao);border-radius:14px;padding:32px 28px;max-width:420px;width:100%;box-shadow:0 2px 18px rgba(0,0,0,.08);text-align:center}
h1{margin:0 0 6px;font-size:2rem;letter-spacing:.02em}
.sub{color:var(--suave);margin:0 0 18px}
p{line-height:1.5}
.botao,button{display:inline-block;background:var(--marca);color:#fff;border:0;border-radius:9px;padding:12px 20px;font-size:1rem;text-decoration:none;cursor:pointer}
label{display:block;text-align:left;margin:8px 0 6px;color:var(--suave);font-size:.95rem}
input{width:100%;padding:12px;border-radius:9px;border:1px solid #c9ced8;font-size:1rem;margin-bottom:14px;background:var(--fundo);color:var(--texto)}
footer{color:var(--suave);font-size:.85rem;margin-top:18px}
a{color:var(--marca)}
.dica{margin-top:18px;font-size:.92rem}