.about__main-nav {
  margin: 3.2rem 8rem 0;
  background-color: #FFFFFF;
  padding: 4rem 6rem;
  display: block;
  gap: 4rem;
  row-gap: 4rem;
  column-gap: 4rem;
  flex-wrap: wrap;
}
.about__main-nav a {
    display: flex;
    font-size: 1.6rem;
    color: #353636;
    transition: color 0.3s ease;
    font-weight: bold;
    width: calc(25% - 4rem);
    padding-bottom: 2rem;
    border-bottom: solid 0.1rem #CCCCCC;
    position: relative;
}
.about__main-nav a:hover {
    color: #145D99;
    transition: color 0.3s ease;
}
.about__main-nav a:hover::after {
    transform: scaleX(1);
}

.about__main-nav a::after {
    content: "";
    display: block;
    width: 100%;
    height: 0.2rem;
    background-color: #145D99;
    transition: transform 0.7s ease;
    position: absolute;
    bottom: -0.1rem;
    left: 0;
    z-index: 1;
    transform: scaleX(0.2);
    transform-origin: left;
}
.nav__box {
  display: flex;
  align-items: center;
  margin-bottom: 6rem;
  gap: 4rem;
}
.tour__box-map img {
  height: 100%;
}
.nav__box .prefecture {
  font-size: 2.4rem;
  color: #FFF;
  font-weight: bold;
  background-color: #EA5B13;
  width: 12rem;
  text-align: center;
  padding:1.3rem 0 ;
  border-radius: 0.5rem;
}
.nav__box.green .prefecture  {
  background-color: #137C2A;
}

.page-tour section {
  margin: 18rem 12rem;
}
.page-tour section:first-of-type {
  margin-top: 6rem;
}
.top-tour__h3 {
  margin-bottom: 8rem;
}

.tour__box-contents .content::after {
  margin-left: -4rem;
  margin-top: -4rem;
  width: calc(100% + 8rem);
  height: calc(100% + 8rem);
  border-radius: 0.5rem;
}
.tour__box-txt {
  padding-bottom: 4rem;
}
.tour__box-img img {
  border-radius:  0 .7rem 0 0;
}
.tour__box-contents .content {
  border-radius: 0.7rem;
}
@media screen and (max-width: 1024px) {
  .about__main-nav {
    margin: 3.2rem 2rem 0;
    padding: 4rem 2rem;
  }
  .about__main-nav a {
    font-size: 1.4rem;
    width: 100%;
  }
  .nav__box {
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 4rem;
    gap: 2rem;
  }
  .nav__box:last-of-type {
    margin-bottom: 0;
  }
  .nav__box .prefecture {
    margin: auto;
    margin-bottom: 0rem;
    font-size: 2rem;
    width: 100%;
    
  }
  .tour__box-contents .content::after {
    margin-left: -2rem;
    margin-top: -2rem;
    width: calc(100% + 4rem);
    height: calc(100% + 4rem);
    border-radius: 0.5rem;
  }
    .asset__h3 {
    margin-bottom: 4rem;
    width: calc( 100% + 4rem);
    margin-left: -2rem;
    }
  .asset__h3 h3 {
    font-size: 1.6rem;
    line-height: 1.2;
    margin-bottom: 1.6rem;
    padding: 0;
  }
  .asset__h3::after {
    visibility: hidden;
  }
  .page-tour section {
    margin: 6rem 4rem;
  }
  .tour__box-img img {
    border-radius: 0.7rem 0.7rem 0 0;
  }
}

.asset__nav-icon {
  margin-left: auto;
    transform: rotate(270deg);
  transition: all 0.3s ease;
  display: block;
  width: .86rem;
  /* 12px */
  filter: invert(21%) sepia(7%) saturate(80%) hue-rotate(131deg) brightness(89%) contrast(93%);
  object-fit: contain;
}
.about__main-nav a:hover .asset__nav-icon {
    filter: invert(21%) sepia(46%) saturate(4369%) hue-rotate(193deg) brightness(89%) contrast(84%);
}