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

body {
    background: #f3f3f3;
    font-family: 'Open Sans', sans-serif;
}

a{
    text-decoration: none; /*Es para quitar el subrrayado que por defencto le ponen a los links*/    
}

.contenedor{
    width: 90%;
    max-width: 800px; /*Para controlar que tan ancho quiero la pag*/
    margin: auto;
}

/*-------------------*/
/* HEADER */
/*-------------------*/

header {
    padding: 40px 0;
}
header .logo{
    text-align: center;
    margin-bottom: 40px;
}

header .logo p {
    color: #9b9b9b;
}

header form {
    width: 100%;
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

header .barra-busqueda {
    width: 70%; /*ancho*/
    height: 40px; /*alto*/
    line-height: 40px; /*para que el texto del input este centrado*/
    background: #fff;
    padding: 0 20px;
    border-radius: 100px;
    border: none;
    text-align: center;
    font-size: 16px;
}

header .categorias {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

header .categorias a{
    color: #9b9b9b;
    margin: 10px 20px;
    font-size: 18px;
    font-weight: 700;
}

header .categorias a.activo {
    color: #000;
}

/*-------------------*/
/* GRID */
/*-------------------*/

.grid {
    position: relative;
    width: 100%;
    opacity: 0;
    transition: opacity 0.5s linear 1s;
}

.grid.imagenes-cargadas{
    opacity: 1;
}

.grid .item {
    position: absolute;
    display: block;
    padding: 0;
    margin: 10px;
    width: calc(33.3333% - 20px);
}

.grid .item-contenido {
    position: relative;

}

.grid .item img {
    width: 100%;
    cursor: pointer;
    vertical-align: top;
}
/*-------------------*/
/* Overlay*/
/*-------------------*/

.overlay {
    position:  fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0,0,0,.9);
    width: 100%;
    height: 100vh;
    display: none;
    align-items: center; /*Nos sirve para centrar algo de forma vertical*/
    justify-content: center; /*Nos sirve para centrar algo de forma horizontal*/
    flex-direction: column;

}

.overlay.activo {
    display: flex;
}

.overlay img {
    max-width: 100%;
}

.overlay .descripcion {
    display:  block;
    background: #fff;
    padding: 20px;
    text-align: center;
    margin-top: 5px;
    border-radius: 10px;
    max-width: 50%;
}

.contenedor-img {
    position: relative;

}

.overlay #btn-cerrar-popup {
    background: none;
    font-size: 20px;
    color: #fff;
    border: none;
    cursor:  pointer;
    position: absolute;
    right: -20px;
    top: -20px
}

/*-------------------*/
/* footer*/
/*-------------------*/

footer .redes-sociales{
    display: flex;
    align-content: center;
    justify-content: center;
    padding: 20px;
    flex-wrap: wrap;
}

footer .redes-sociales a {
    display: block;
    width: 60px;
    height: 60px;
    background: #000;
    color: #fff;
    margin: 20px;
    text-align: center;
    border-radius: 100px;
    transition: .3s ease all;
}

footer .redes-sociales .twitter {background: #1da1f2;}
footer .redes-sociales .facebook {background: #3b5998;}
footer .redes-sociales .instagram {background: #c13584;}

footer .redes-sociales a i {
    font-size: 20px;
    line-height: 60px;
}

footer .contenedor-icono:hover a {
    animation: icono .5s ease;
}

@keyframes icono{
    from {
        transform: rotate3d(0,0,0,0);
    }
    to{
        transform: rotate3d(0,1,0, 360deg);
    }
}

footer .creado-por {
    margin-bottom: 40px;
    text-align: center;
    font-size: 14px;
    color: #c13584;
}

/*-------------------*/
/* Mediaqueries*/
/*-------------------*/
@media screen and (max-width: 700px){
    .grid .item {
        width: calc(50% - 20px);
    }

    header .barra-busqueda{
        width: 100%;
    }
}