```css
*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}


body{

    font-family:Arial, Helvetica, sans-serif;

    background:#f4f7fb;

    color:#333;

}



/* TOPO */

header{

    height:80px;

    background:#063970;

    display:flex;

    align-items:center;

    justify-content:space-between;

    padding:0 40px;

    box-shadow:0 4px 12px rgba(0,0,0,.15);

}



.logo-area img{

    height:55px;

}



.portal-title{

    color:white;

    font-size:26px;

    font-weight:bold;

}



/* BANNER */

.banner{

    text-align:center;

    padding:45px 20px;

}



.banner h1{

    color:#063970;

    font-size:32px;

    margin-bottom:15px;

}



.banner p{

    font-size:18px;

    color:#555;

}



/* FORMULARIO */

main{

    max-width:700px;

    margin:auto;

    padding:20px;

}



.card{

    background:white;

    border-radius:15px;

    padding:35px;

    box-shadow:0 8px 20px rgba(0,0,0,.08);

}

/* CAMPOS DO FORMULÁRIO */

label{

    display:block;

    margin-bottom:6px;

    margin-top:18px;

    color:#063970;

    font-weight:bold;

    font-size:14px;

}


input,
select,
textarea{

    width:100%;

    padding:12px;

    border-radius:8px;

    border:1px solid #ddd;

    font-size:15px;

    font-family:Arial, Helvetica, sans-serif;

}


textarea{

    resize:none;

}


/* BOTÃO ENVIAR */

button{

    width:100%;

    margin-top:25px;

    background:#0969d8;

    color:white;

    border:none;

    padding:13px;

    border-radius:8px;

    font-size:16px;

    font-weight:bold;

    cursor:pointer;

}


button:hover{

    background:#004a9f;

}

/* SUCESSO */

.sucesso{

    max-width:700px;

    margin:40px auto;

    text-align:center;

}



.sucesso h2{

    color:#063970;

    margin-bottom:15px;

}



.descricao{

    font-size:18px;

    color:#555;

}



.protocolo{

    margin-top:25px;

    padding:20px;

    background:#f4f7fb;

    border-radius:10px;

}



.protocolo strong{

    display:block;

    margin-top:10px;

    color:#063970;

    font-size:22px;

}



/* BOTÃO VOLTAR */

.area-voltar{

    text-align:center;

    margin-top:30px;

}



.btn-voltar{

    display:inline-block;

    padding:12px 25px;

    background:#0057b8;

    color:#ffffff !important;

    text-decoration:none !important;

    border-radius:8px;

    font-size:15px;

    font-weight:600;

    transition:.3s ease;

}



.btn-voltar:hover{

    background:#003f87;

    transform:translateY(-2px);

}



/* RODAPÉ */

footer{

    text-align:center;

    padding:25px;

    color:#777;

    font-size:14px;

}



/* MOBILE */

@media(max-width:700px){


header{

    height:auto;

    flex-direction:column;

    padding:20px;

}



.portal-title{

    margin-top:15px;

    font-size:22px;

}



.banner h1{

    font-size:25px;

}



.card{

    padding:25px 20px;

}



}
```