.mainNav {
    border: 1px solid #1f2937;
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    display: none;
    margin-left: 3%;
    height: 8% !important;
    position: absolute;
    border-radius: 12px;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, 'Helvetica Neue', Arial;    
}

.mainNavTitulo {
    display: flex;
    width: 100%;
    justify-content:center;
}

    .ImgShip {
        margin-top: 0.2%;
    }
    .ImgShip:hover {
        cursor:pointer;
    }

.btnNav {

}
    .btnNav:hover {
        cursor: pointer;
        border: 1px solid #1f2937;
    }

.nav-item {
    position: relative;
    color: #ffffff;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    padding: 0.25rem 0;
    transition: color 0.3s ease;
}

    .nav-item::after {
        content: "";
        position: absolute;
        left: 0;
        bottom: -4px;
        width: 0;
        height: 2px;
        background-color: #fff9c4; /* azul acento */        
        transition: width 0.3s ease;
    }

    .nav-item:hover {
        color: #3b82f6; /* cambia el color del texto */
    }

        .nav-item:hover::after {
            width: 100%; /* subrayado se expande */
        }

#IdNav {
    background-color: #3b82f6; /* azul acento */
}