@charset "utf-8";

/* ------- INDEX ---------------------------------------------- */
.introduction-index #header-area{
  background-color: transparent;
  padding-top: 0;
  transition: .2s;
}
.introduction-index #header-area.active{
  background-color: #EBEAE9;
}
.introduction-index #footer-area{
  margin-top: 0;
}


.introduction-section-wrap{
  counter-reset: number 0;
}


.introduction-section-heading{
  position: relative;
  padding-top: 90px;
}
.introduction-section-heading:before{
  counter-increment: number 1;
  content: counter(number,decimal-leading-zero) " ";
  color: rgba(0,0,0,.10);
  font-family: 'Lora', serif;
  font-style: italic;
  font-weight: 400;
  font-size: 14.0rem;
  line-height: 1;
  position: absolute;
  top: 25px;
  left: 70px;
}
.introduction-section-heading .chapter,
.introduction-section-heading .en-heading{
  line-height: 1;
}
.introduction-section-heading .chapter{
  color: #A02B2E;
  font-style: italic;
}
.introduction-section-heading .en-heading{
  margin-top: 15px;
}
.introduction-section-heading h2{
  font-family: 'Shippori Mincho', serif;
  font-weight: 400;
  line-height: 1.8;
}



.introduction-section-contents hr{
  border-top: 1px solid rgba(112,112,112,.19);
  margin: 60px 0;
}

.section-image{
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
}




.introduction-fig figcaption{
  font-family: 'Shippori Mincho', serif;
  font-weight: 400;
  text-align: center;
}
@media print, screen and (min-width:781px) {
  .introduction-index{
    padding-top: 0;
  }
  .introduction-contents{
    display: flex;
    width: 100%;
  }
  .introduction-contents-detail{
    padding-bottom: 200px;
    width: 50%;
  }
  
  
  .introduction-contents .heading{
    margin-left: auto;
    margin-right: auto;
    margin-top: 180px;
    width: 70%;
  }
  
  .introduction-section-wrap{
    margin-left: auto;
    margin-right: auto;
    width: 70%;
  }
  
  
  .introduction-section{
    margin-top: 220px;
  }
  .introduction-section:first-child{
    margin-top: 190px;
  }
  
  .introduction-section-contents > p{
    margin-top: 50px;
  }
  .introduction-fig{
    display: flex;
    justify-content: space-between;
    margin-top: 55px;
  }
  .introduction-fig figcaption{
    font-size: 1.5rem;
    margin-top: 20px;
  }
  .introduction-fig-list > .image{
    width: 44%;
  }
  .introduction-fig + .note-list{
    margin-top: 35px;
    text-align: center;
  }
  
  
  .introduction-section-heading .chapter,
  .introduction-section-heading .en-heading{
    font-size: 1.4rem;
  }
  .introduction-section-heading h2{
    font-size: 3.0rem;
    margin-top: 30px;
  }
  
  
  .pc-image{
    position: sticky;
    right: 0;
    top: 0;
    height: 100vh;
    width: 50%;
  }
  .pc-image > div{
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    width: 100%;
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    visibility: hidden;
    transition: 1s;
    opacity: 0;
  }
  .pc-image > div.active{
    visibility: visible;
    opacity: 1;
  }
  .pc-image > div:nth-child(1){
    background-image: url("../img/pc_image01.jpg");
  }
  .pc-image > div:nth-child(2){
    background-image: url("../img/pc_image02.jpg");
  }
  .pc-image > div:nth-child(3){
    background-image: url("../img/pc_image03.jpg");
  }
  .pc-image > div:nth-child(4){
    background-image: url("../img/pc_image04.jpg");
  }
}
@media screen and (max-width: 780px) {
  .introduction-index{
  }
  .introduction-contents{
  }
  .introduction-contents-detail{
    padding-bottom: 100px;
  }
  
  
  .introduction-contents .heading{
  }
  
  .introduction-section-wrap{
  }
  
  
  .introduction-section{
    margin-top: 80px;
  }
  .introduction-section:first-child{
    margin-top: 30px;
  }
  .introduction-section-contents{
    margin-left: 20px;
    margin-right: 20px;
  }
  .introduction-section-contents > p{
    line-height: 2.5;
    margin-top: 25px;
  }
  .introduction-fig{
    margin-top: 40px;
  }
  .introduction-fig figcaption{
    font-size: 1.5rem;
    margin-top: 20px;
  }
  .introduction-fig-list > .image{
    margin-top: 40px;
    margin-left: auto;
    margin-right: auto;
    width: 62.85%;
  }
  .introduction-fig + .note-list{
    margin-top: 35px;
    text-align: center;
  }
  
  
  .introduction-section-heading:before{
    font-size: 10.0rem;
    position: absolute;
    top: 60px;
    left: 50%;
    transform: translateX(-50%);
  }
  .introduction-section-heading .chapter,
  .introduction-section-heading .en-heading{
    text-align: center;
    font-size: 1.4rem;
  }
  .introduction-section-heading h2{
    font-size:min(6.85vw,2.4em);
    margin-top: 50px;
    text-align: center;
  }
  
  .section-image{
    padding-bottom: 66%;
  }
  .introduction-section:nth-child(1) .section-image{
    background-image: url("../img/sp_image01.jpg");
  }
  .introduction-section:nth-child(2) .section-image{
    background-image: url("../img/sp_image02.jpg");
  }
  .introduction-section:nth-child(3) .section-image{
    background-image: url("../img/sp_image03.jpg");
  }
  .introduction-section:nth-child(4) .section-image{
    background-image: url("../img/sp_image04.jpg");
  }
  
  .pc-image{
    display: none;
  }
}
@media (hover: hover) and (pointer: fine){
}