/* -----------------
main
-------------------- */
/*
.back_btn a {
  display: inline-block;
  position: relative;
  padding: 20px 20px 20px 35px;
  font-family: "Helvetica Neue", "Helvetica", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Arial", "Yu Gothic", "Meiryo", sans-serif;
  font-weight: 600;
  font-size: 1.6rem;
  line-height: 1;
  color: #606060;
  border-bottom: 2px solid #f2f2f2;
  transition: .3s;
}

.back_btn a::before {
  display: inline-block;
  position: absolute;
  top: 50%;
  left: 20px;
  content: '';
  width: 16px;
  height: 16px;
  border-top: 1px solid #606060;
  border-left: 1px solid #606060;
  transform: translateY(-50%) rotate(-45deg);
}

.back_btn a:hover,
.back_btn a:active,
.back_btn a:focus {
  background: rgba(0, 102, 255,.12);
  border-bottom: 2px solid #0066ff;
}
*/

.topic_path:nth-of-type(2) {
  background-color: #f2f2f2;
}



/* -----------------
cont_wrap
-------------------- */
#cont_wrap {
  padding: 75px 0;
}

#cont_wrap .ttl {
  text-align: center;
  margin-bottom: 70px;
}

#cont_wrap .ttl_txt {
  font-weight: 700;
  font-size: 2.4rem;
  line-height: 1;
  letter-spacing: .05em;
  text-indent: .05em;
  color: rgba(0,0,0,.87);
  display: inline-block;
  position: relative;
  padding-bottom: 18px;
}

#cont_wrap .ttl_txt::before {
  content:"";
  display: block;
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 8px;
  background: #06f;
  border-radius: 4px;
}

#cont_wrap .sttl {
  font-weight: 700;
  font-size: 2.6rem;
  line-height: 1.5;
  letter-spacing: .02em;
  color: #005BAC;
  margin-bottom: 50px;
}

#cont_wrap .list {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

#cont_wrap .list::after {
  content:"";
  width: 31.25%;
}

#cont_wrap .list li {
  margin-bottom: 4.166666666%;
  width: 31.25%;
}

#cont_wrap .list a {
  display: block;
}

#cont_wrap .list img {
  width: 100%;
}

@media screen and (max-width: 767px) {
  #cont_wrap {
    padding: 75px 0 100px;
  }

  #cont_wrap .ttl {
    margin-bottom: 50px;
  }

  #cont_wrap .ttl_txt {
    font-size: 2rem;
  }

  #cont_wrap .sttl {
    font-size: 1.8rem;
    margin-bottom: 30px;
  }

  #cont_wrap .list {
    display: block;
  }

  #cont_wrap .list::after {
    display: none;
  }

  #cont_wrap .list li {
    margin: 0 auto 15px;
    width: 100%;
    max-width: 500px;
  }
}

main nav {
  padding-top: 65px;
  padding-bottom: 65px;
  background-color: #ffffff;
}
main nav ul {
  display: flex;
  flex-wrap: wrap;
}
main nav li {
  width: calc((100% - 80px) / 4);
  margin: 10px;
  border: 1px solid rgba(0,0,0,.08);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: 0 4px 16px rgb(0 0 0 / 5%);
  transition: .3s;
}
main nav li:hover,
main nav li:active,
main nav li:focus {
  background: rgba(33,33,33,.04);
}
main nav li:hover img {
  transform: scale(1.8);
  transform-origin: 100% 100%;
}
main nav li:hover .center img {
  transform-origin: 50% 50%;
}
main nav li a {
  display: block;
  position: relative;
  height: 100%;
  padding: 16px;
}
main nav li img {
  border-radius: 5px;
  transition: .3s;
}
main nav li .img {
  border-radius: 5px;
  overflow: hidden;
}
main nav li .txt_box {
  margin-top: 10px;
  line-height: 1.4em;
}
main nav .current {
  background: rgba(33,33,33,.04);
}
main nav .current a::before {
  display: block;
  position: absolute;
  top: 10px;
  left: 10px;
  content: '閲覧中';
  padding: 5px 5px 7px;
  background-color: #cc0000;
  color: #ffffff;
  line-height: 1em;
  z-index: 5;
}
@media screen and (min-width: 851px) {
  main nav {
    padding-bottom: 80px;
  }
}
@media screen and (max-width: 850px) {
  main nav li {
    width: calc((100% - 40px) / 2);
  }
}