.cabecalho{
    position: absolute;
    top: -2.5em;
    left: 50%;
    transform: translate(-50%);
    text-align: center;
    width: 100%;
    border-bottom: 1px solid #103d4a;
    padding-bottom: .5em;
}

.cabecalho-logo{
    margin-bottom: .2em;
}

.cabecalho-logo-img{
    margin: 0 auto;
    display: block;
    transition: filter .3s;
}

.cabecalho-logo-img:hover,
.cabecalho-logo-img:focus{
    filter: brightness(1.2);
}

.cabecalho-nav{
    text-align: center;
}

.cabecalho-nav-item{
    text-decoration: inline-block;
    line-height: 2;
    margin: 0 .5em;
    font-size: .95em;
}

.cabecalho-nav-item a {
    text-decoration: none;
    color: #fff;
    font-family: 'opem sans', serif;
}

.cabecalho-nav-item a:hover,
.cabecalho-nav-item a:focus {
    text-decoration: underline;
}

@media (min-width: 830px){

    .cabecalho{
        border-bottom: 0;
        padding-bottom: 0
    }

    .cabecalho-logo{
        float: left;
    }

    .cabecalho-nav{
        float: right;
        margin-top: 1em;
    }
}