.contents {
  padding-left: 140px;
  padding-right: 140px;
  display: flex;
  padding-bottom: 30px;
}

.project_navigation,
.project_contents {
  padding-top: 64px;
}

.project_navigation {  
  min-width: 120px;
}


.project_navigation p {
  margin-bottom: 16px;
  max-width: 189px;
}

.project_navigation a {
  text-decoration: none;
  color: #828282;
  font-size: 12px;
}

.navigation_active {
  border-bottom: 1px solid #828282;
}

.project_contents {
  padding-left: 50px;
  padding-right: 80px;
  display: flex;
  justify-content: center;
  align-items:center;
  width:100%;
}

.project_contents img {
  width: 100%;
  cursor: pointer;
  max-width: 820px;
}

.popup {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: #000;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10;
}

.hidden {
  display: none !important;
}

.popup_content {
  display: flex;
  justify-content: center;
  align-items: center;
}

.close {
  position: absolute;
  top: 30px;
  right: 30px;
  font-size: 40px;
  cursor: pointer;
}

.slider,
.slide {
  width: 800px;
}

#items {
  left: -800px;
}

.slide,
.slider,
.popup_content {
  height: 562px !important;
}

.slide img {
  object-fit: scale-down;
  max-height: 562px;
}

.prev,
.next {
  margin: 0 50px;
}

.prev i,
.next i {
  font-size: 24px;
  color: #C4C4C4;
}


@media screen and (max-width: 1000px) {
  .slider,
  .slide {
    width: 700px;
  }

  #items {
    left: -700px;
  }

  .slide img {
    max-height: 400px;
  }

  .prev,
  .next {
    margin: 0 20px;
  }
}

@media screen and (max-width: 850px) {
  .contents {
    padding-left: 50px;
    padding-right: 50px;
  }

  .project_contents {
    padding-left: 20px;
    padding-right: 20px;
  }

  .slide img {
    max-height: 300px;
  }

  .slide,
  .slider,
  .popup_content {
    height: 400px !important;
  }

  .slider,
  .slide {
    width: 500px;
  }

  #items {
    left: -500px;
  }

  .slide img {
    max-height: 400px;
  }
}

@media screen and (max-width: 500px) {
  .contents {
    padding-left: 10px;
    padding-right: 10px;
  }
  
  .project_contents, .project_navigation {
      padding-top:100px;
  }

  .project_contents {
    padding-left: 20px;
    padding-right: 20px;
  }

  .project_navigation {
    min-width: 100px;
    padding-left: 10px;
  }

  .project_navigation p {
    max-width: 100px;
  }

  .slider,
  .slide {
    width: 300px;
  }

  .slide,
  .slider,
  .popup_content {
    height: 250px !important;
  }

  #items {
    left: -300px;
  }

  .slide img {
    max-height: 300px;
  }
}