/* popup */

.popup{
  width: 100%;
  height: 100vh;
  display: none;

  position: fixed;
  top: 0;
  right: 0;
}

#popup-article:target{
  display: -webkit-box;
  display: flex;
}

#popup-article1:target{
  display: -webkit-box;
  display: flex;
}

#popup-article2:target{
  display: -webkit-box;
  display: flex;
}

.popup::before{
  content: "";
  box-sizing: border-box;
  width: 100%;
  background-color: #fff;

  position: fixed;
  left: 0;
  top: 50%;
  will-change: height, top;
  -webkit-animation: open-animation .6s cubic-bezier(0.83, 0.04, 0, 1.16) .65s both;
          animation: open-animation .6s cubic-bezier(0.83, 0.04, 0, 1.16) .65s both;
}

.popup::after{
  content: "";
  width: 0;
  height: 2px;
  background-color: #f0f0f0;

  will-change: width, opacity;
  -webkit-animation: line-animation .6s cubic-bezier(0.83, 0.04, 0, 1.16) both;
          animation: line-animation .6s cubic-bezier(0.83, 0.04, 0, 1.16) both;

  position: absolute;
  top: 50%;
  left: 0;
  margin-top: -1px;
}

@-webkit-keyframes line-animation{

  0%{
    width: 0;
    opacity: 1;
  }

  99%{
    width: 100%;
    opacity: 1;
  }

  100%{
    width: 100%;
    opacity: 0;
  }  
}

@keyframes line-animation{

  0%{
    width: 0;
    opacity: 1;
  }

  99%{
    width: 100%;
    opacity: 1;
  }

  100%{
    width: 100%;
    opacity: 0;
  }  
}

@-webkit-keyframes open-animation{

  0%{
    height: 0;
    top: 50%;
  }

  100%{
    height: 100vh;
    top: 0;
  }
}

@keyframes open-animation{

  0%{
    height: 0;
    top: 50%;
  }

  100%{
    height: 100vh;
    top: 0;
  }
}

.popup__block{
  height: calc(100vh - 40px);
  padding: 5% 15%;
  box-sizing: border-box;
  position: relative;

  margin: auto;
  overflow: auto;
  -webkit-animation: fade .5s ease-out 1.3s both;
          animation: fade .5s ease-out 1.3s both;
}

@-webkit-keyframes fade{

  0%{
    opacity: 0;
  }

  100%{
    opacity: 1;
  }
}

@keyframes fade{

  0%{
    opacity: 0;
  }

  100%{
    opacity: 1;
  }
}

.popup__title{
  font-size: 1.5rem;
  margin: 0 0 1em;
}

.popup__close{
  width: 2rem;
  height: 2rem;
  text-indent: -9999px;

  position: fixed;
  top: 20px;
  right: 20px;

  background-repeat: no-repeat;
  background-position: center center;
  background-size: contain;
  background-image: url(data:image/svg+xml;base64,PHN2ZyBmaWxsPSIjMDAwMDAwIiBoZWlnaHQ9IjI0IiB2aWV3Qm94PSIwIDAgMjQgMjQiIHdpZHRoPSIyNCIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj4gICAgPHBhdGggZD0iTTE5IDYuNDFMMTcuNTkgNSAxMiAxMC41OSA2LjQxIDUgNSA2LjQxIDEwLjU5IDEyIDUgMTcuNTkgNi40MSAxOSAxMiAxMy40MSAxNy41OSAxOSAxOSAxNy41OSAxMy40MSAxMnoiLz4gICAgPHBhdGggZD0iTTAgMGgyNHYyNEgweiIgZmlsbD0ibm9uZSIvPjwvc3ZnPg==);
}

/*
* demo page
*/

body{
  font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Open Sans, Ubuntu, Fira Sans, Helvetica Neue, sans-serif;
  font-size: 1rem;
  color: #222;
  background-color: #512da8;
  margin: 0;
}

p{
  margin: 0;
  line-height: 1.5;
}

p:nth-child(n+2){
  margin-top: 1rem;
}

.open-popup{
  color: #fff;
  text-decoration: none;
  text-transform: uppercase;
  padding: .75rem 1.25rem;
  border: 1px solid;
}

.page{
  min-height: 100vh;
  display: -webkit-box;
  display: flex;
}

.page__container{
  max-width: 1200px;
  padding-left: .75rem;
  padding-right: .75rem;  
  margin: auto;
}