:root{
    --blanco: #fff;
    --negro: #000;
    --verde: #56cc1f;
    --rojo: #c71a1a;
    --violeta: #690077;
    --naranja: #d67900;
    --amarillo: #f2f700;
    


}


/* GLOBALES */

html{
    font-size: 62.5%; /* 1REM = 10px */
    box-sizing: border-box;
    background-color: aquamarine;
}

*,
*::after
*::before{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

img{
    max-width: 100%;
    display: block;
  }
  
  
  
.contenedor{
    width: 95%;
    max-width: 1200px;
    margin: 0 auto;
  }
  
  
.centrar{
    text-align: center;
  }
  
a{
    text-decoration: none;
}

h1{
    font-size: 4rem;
}
  
h2{
    font-size: 3rem;
}
  
h3{
    font-size: 2rem;
}




/* HEADER */

.header{
    width: 100%;
    color: #5cf2f7;
    display: block;
    max-height: 40rem;
    background-repeat: no-repeat;
    background-image: url(../img/exclusion-social.jpg);
    background-size: 100%;
    background-position: 50%;
    background-attachment: scroll;
    font-weight: 900;
    margin-bottom: 5rem;
}

.header-caja{
    display: flex;
    flex-direction: column;
}

.header-nav{
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    text-align: center;
    width: 90%;
    margin: 5rem auto;
    font-size: 2rem;
}

.header-nav a{
    color: var(--blanco);
    font-weight: 700;
    background-color: #5cf2f783;
}


/* PRINCIPAL */

.principal{
    display: flex;
    flex-direction: column;
}

.qr{
    margin: auto;
}

.caja-uno, .caja-dos, .caja-tres, .caja-cuatro{
    width: 50%;
    background-color: #fff;
    border-radius: 2rem;
    text-align: center;
}


.caja-uno h2{
    margin: 3rem 3rem;
}

.caja-uno img{
    height: 35rem;
    margin: 1rem auto;
}

.caja-dos, .caja-cuatro{
    margin: 1rem 0 1rem 50%;
}

.caja-dos img{
    height: 25rem;
    margin: 1rem auto;
}

.caja-dos p{
    font-size: 1.3rem;
    margin: auto 3rem;
}

.caja-tres img{
    height: 20rem;
    margin: 1rem auto;
}

.caja-cuatro{
    display: flex;
    flex-direction: column;
}

.caja-cuatro input{
    line-height: 2;
    margin: 1rem 4rem;
    font-size: 1.5rem;
    text-align: center;
}


/** FOOTER **/
.footer{
    background-color: #2e2e2e;
    color: #fff;
}
.nav-footer{
    display: flex;
    gap: 2rem;
    justify-content: space-between;
}

.hijo{
    display: flex;
    flex-direction: column;
    font-size: 1.2rem;
    line-height: 2;
    text-align: center;
}

.hijo a{
    text-decoration: none;
    color: #fff;
}

@media (max-width: 768px){
    .header{
        background-size: 150%;
    }

    .header-nav a{
        margin: 1rem;
        font-size: 1.5rem;
    }

    .header h2{
        display: none;
    }

    .caja-uno, .caja-dos, .caja-tres, .caja-cuatro{
        max-height: 1000rem;
        width: 90%;
        margin: 2rem auto;
        border-radius: 2rem;
    }

}