* {
  box-sizing: border-box;
}


.group {
  display: flex;
  flex-direction: column;
  width: 100%;
  -webkit-transform: translate3d(0, 0, 0);
          transform: translate3d(0, 0, 0);
}


.group section:hover {
  flex: 2;
}
.group section:hover:after {
  opacity: .8; /* 오버시 배경 투명도 */
}
.group section:hover article {
  opacity: 1;
  -webkit-transform: translateY(0);
          transform: translateY(0);
  transition: opacity .2s .2s, -webkit-transform .2s .2s;
  transition: opacity .2s .2s, transform .2s .2s;
  transition: opacity .2s .2s, transform .2s .2s, -webkit-transform .2s .2s;
}

section {
  flex: 1;
  position: relative;
  width: 100%;
  min-height: 20vh;
  overflow: hidden;
  z-index: 1;
  transition: flex-grow .2s, opacity .2s;
}

section:before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background-position: center;
  background-size: cover;
  transition: width .2s, -webkit-transform .2s;
  transition: transform .2s, width .2s;
  transition: transform .2s, width .2s, -webkit-transform .2s;
}
section:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: black;
  opacity: 0;
  transition: opacity .2s;
}




section:nth-child(1):before {
  background-color: #000;
  background-image: url(../images/mb_01.jpg); background-position:center; background-size:cover;
}
.hide-images section:nth-child(1):before {
  background-image: none;
}

section:nth-child(2):before {
  background-color: #000;
  background-image: url(../images/mb_02.jpg); background-position:center; background-size:cover;
}
.hide-images section:nth-child(2):before {
  background-image: none;
}

section:nth-child(3):before {
  background-color: #000;
  background-image: url(../images/mb_03.jpg); background-position:center; background-size:cover;
}
.hide-images section:nth-child(3):before {
  background-image: none;
}

section:nth-child(4):before {
  background-color: #000;
  background-image: url(../images/mb_04.jpg); background-position:center; background-size:cover;
}
.hide-images section:nth-child(4):before {
  background-image: none;
}

section:nth-child(5):before {
  background-color: #000;
  background-image: url(../images/mb_05.jpg); background-position:center; background-size:cover;
}
.hide-images section:nth-child(5):before {
  background-image: none;
}

section:nth-child(6):before {
  background-color: #000;
  background-image: url(../images/mb_06.jpg); background-position:center; background-size:cover;
}
.hide-images section:nth-child(6):before {
  background-image: none;
}


section:before {
  background-color: #000;
}
section:after {
  opacity: .3; /* 배경 기본 투명도 */
}
section:article {
  display: none;
}

article {
  position: relative;
  padding: 24px;
  width: 100%;
  height: 100%;
  text-align: center;
  color: white;
  z-index: 1;
  transition: opacity .2s, -webkit-transform .2s;
  transition: opacity .2s, transform .2s;
  transition: opacity .2s, transform .2s, -webkit-transform .2s;
}


/* 텍스트 */

article h2 {
  font-size: 2.0em;
  margin-bottom: 12px;
}

article p { display:block; letter-spacing:1.0px; }
article p:after {content :""; display:block; background:#fff; margin:10px auto 15px; width:22px; height:2px; }

article span { display:block; background:url(../images/more_arr2.png) 85% 50% no-repeat; border:1px solid #fff; margin:20px auto; width:90px; padding:5px 15px; font-size:0.8em; font-weight:500; text-align:left; transition:all 0.5s; }

button {
  position: fixed;
  top: 12px;
  left: 12px;
  padding: 8px 12px;
  font-size: 10px;
  text-transform: uppercase;
  color: white;
  background-color: black;
  border: none;
  outline: none;
  cursor: pointer;
}






@media (min-width: 630px) {
  .group {
    flex-direction: row;
    width: 100%;
    margin-left: 0;
  }
	
	.group section:hover article {
    -webkit-transform: translateY(0) skewX(0);
            transform: translateY(0) skewX(0);
  }
	
	section {
    width: 16%; border-right:1px solid #c9c9c9;
    height: 60vh;
    margin-right:;
    -webkit-transform: skewX(0) translateZ(0);
            transform: skewX(0) translateZ(0);
  }
  section:before {
    left: ;
    width: 100%;
    -webkit-transform: skewX(0);
            transform: skewX(0);
  }
  article {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    margin: auto;
    opacity: 1;
    -webkit-transform: translateY(24px) skewX(0);
            transform: translateY(24px) skewX(0);
  }
  
  
}