*{
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
}



.header {
    min-height: 100vh;
    width: 100%;
    background-image: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
                      url(imagens/banner.jpg);
    background-position: center;
    background-size: cover;
    position: relative;
}

nav {
    display: flex;
    padding: 2% 6%;
    justify-content: space-between;
    align-items: center;
}

nav img {
    max-width: 70px; /* Em vez de width: 70px; */
}
.menu{
    flex: 1;
    text-align: right;
}
.menu ul li{
    list-style: none;
    display: inline-block;
    padding: 8px 12px;
    position: relative;
}
.menu ul li a{
    color: #ffffff;
    text-decoration: none;
    font-size: 13px;
}
.menu ul li::after{
    content: '';
    width: 0%;
    height: 2px;
    background: #ffffff;
    display: block;
    margin: auto;
    transition: 0.5s;
}
.menu ul li:hover::after{
    width: 100%;
}
.texto_principal{
    width: 90%;
    color: #ffffff;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    text-align: center;
}
.texto_principal h1{
    font-size: 62px;
}
.texto_principal p{
    margin: 10px 0 40px;
    font-size: 14px;
    color: #ffffff;
}
.botao_saibamais{
    display: inline-block;
    text-decoration: none;
    color: #ffffff;
    border: 1px solid #ffffff;
    padding: 12px 34px;
    font-size: 13px;
    background: transparent;
    position: relative;
    cursor: pointer;
}
.botao_saibamais:hover{
    border: 1px solid #575757;
    background: #575757;
    transition: 0.5s;
}
.texto_segundario{
    width: 80%;
    margin: auto;
    text-align: center;
    padding-top: 100px;    
}
.texto_segundario h1{
    font-size: 36px;
    font-weight: 600;
}
.texto_segundario p{
    color: #3d3d3d;
    font-size: 16px;
    font-weight: 300;
    line-height: 22px;
    padding: 10px;
}
.coluna{
    margin-top: 5%;
    display: flex;
    justify-content: space-between;
}
.texto_coluna{
    flex-basis: 31%;
    background-color: #ebebeb;
    border-radius: 10px;
    margin-bottom: 5%;
    padding: 20px 12px;
    box-sizing: border-box;
    transition: 0.5s;
}
.texto_coluna h3{
    text-align: center;
    font-weight: 600;
    margin: 10px 0;
}
.texto_coluna:hover{
    box-shadow: 0 0 20px 0px rgba(0,0,0,0.2);
}
.qual_sensa_inova{
    padding: 50px 12%;
    font-size: 17px;
}
.valores{
    display: flex;
    width: 100%;
    align-items: center;
    flex-wrap: wrap;
    padding: 50px 0;
}
.texto_valores{
    flex-basis: 50%;
    margin-bottom: 20px;
}
.img_valores{
    flex-basis: 50%;
    margin-bottom: 20px;
}
.img_valores img{
    display: block;
    width: 90%;
    margin: auto;
    border-radius: 10%;
}
.qual_sensa_inova h2{
    font-size: 40px;
    font-weight: 600;
    margin-bottom: 15px;
}

/* responsividade */
@media screen and (max-width: 768px) {
    .texto_principal h1 {
        font-size: 30px; 
    }
    nav {
        padding: 2% 3%;
    }
    nav img {
        width: 50px;
    }
    .menu {
        text-align: center;
    }
    .menu ul li {
        padding: 5px 12px;
    }
    .menu ul li a {
        font-size: 10px;
    }
    .menu ul li::after {
        width: 0;
    }
    .texto_segundario {
        padding-top: 50px;
    }
    
    .coluna {
        flex-direction: column;
    }
    
    .texto_coluna {
        flex-basis: 100%;
        margin-bottom: 3%;
    }
    .qual_sensa_inova {
        padding: 20px 12%;
        font-size: 15px;
    }
    
    .valores {
        flex-direction: column;
        align-items: center;
        padding: 20px 0;
    }
    
    .texto_valores,
    .img_valores {
        flex-basis: 100%;
        text-align: center;
        margin-bottom: 20px;
    }
    
    .img_valores img {
        max-width: 80%;
    }
}

/* footer */
footer{
    background: #000000;
    height: auto;
    width: 100%;
    padding-top: 40px;
    color: #fff;
    text-align: center;
}
.footer_conteudo{
    display: flex;
    flex-direction: column;
}
.footer_conteudo h3{
    font-size: 1.8rem;
    font-weight: 400;
    text-transform: capitalize;
    line-height: 3rem;
}
.footer_conteudo p{
    max-width: 500px;
    margin: 10px auto;
    line-height: 28px;
    font-size: 14px;
}
.redes{
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 1rem 0 3rem 0;
}
.redes li{
    margin: 0 10px;
}
.redes a{
    text-decoration: none;
    color: #fff;
}
.redes a i{
    font-size: 1.1rem;
    transition: color .4s ease;
}
.facebook:hover{
    color: #3b5998;
}
.instagram:hover{
    color: #c8788a;
}
.linkedin:hover{
    color: #2172e1;
}
.youtube:hover{
    color: #f00104;
}
.footer-bottom{
    background: #000;
    width: 100vw;
    padding: 20px 0;
}
.footer_nomes p{
    font-size: 14px;
    word-spacing: 2px;
}
.footer_nomes span{
    text-transform: uppercase;
    opacity: .4;
    font-weight: 200;
}