#main-cluster {
  padding-top: 50px;
}
#main-cluster h1 {
  color:var(--color-primary);
  font-size: 28px;
  line-height: 28px;
  font-family: "Noto Sans JP", sans-serif;
  font-weight: 700;
  margin-bottom: 15px;
  padding: 0 20px;
}

ul.cluster-scope {
  color: #ffffff;
  font-weight: 500;
  padding: 0 20px;
  margin-bottom: 20px;
}
ul.cluster-scope li {
  display: inline;
  background-color: var(--color-secondary);
  padding: 2px 7px;
  font-size: 10px;
  font-size: 10px;
  border-radius: 20px;
  margin-right: 4px;
}

#main-cluster p.read {
  padding: 0 20px;
  text-align: justify;
}
.cluster-rule {
  font-size: 12px;
  font-weight: bold;
  margin-top: 10px;
  padding: 0 20px;
}

.cluster-rule strong {
  color:var(--color-primary);
}

.cluster-block {
  border-radius: 5px;
  padding: 10px 10px;
  position: relative;
  background-color: #ffffff;
  margin: 30px 10px 0 10px;
}

ul.post-index li {
  width: 100%;
  overflow: hidden;
  margin-bottom: 10px;
  position: relative;
  padding-bottom: 10px;
  border-bottom: 1px solid #eeeeee;
}
ul.post-index a {
  display: block;
  text-decoration: none;
}
ul.post-index li:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}
/*左側
-------------------------------------------------------*/
ul.post-index .post_thumbnail {
  width: 46%;
  float: left;
}

ul.post-index .post_thumbnail img {
  width: 100%;
  height: auto;
  vertical-align: bottom;
  padding: 0;
  margin-bottom: 0;
  border-radius: 3px;
}
/*右側
-------------------------------------------------------*/
ul.post-index .head {
  width: 52%;
  float: right;
  padding-top: 0px;
}
ul.post-index .head h2 {
  font-family: "Noto Sans JP", sans-serif;
  font-weight: 700;
  font-style: normal;
  font-size: 12px;
  line-height: 18px;
  background-image: none;
  border: none;
  margin: 0;
  padding: 0;
  height: auto;
  padding-top: 0px;
}
ul.post-index .head .post-dates {
  font-size: 12px;
  background-image: url(/wp/wp-content/themes/aisiteru/images/icon/time_bl.png);
  background-repeat: no-repeat;
  background-size: 12px auto;
  background-position: left center;
  padding: 0 0 0 16px;
  margin-bottom: 0px;
  color: var(--color-text);
}
ul.post-index .head .post-content {
   color: var(--color-text);
  }
.back-btn a {
  display: block;
  height: 150px;
  width: 150px;
  border-radius: 75px;
  background-color:var(--color-link-back-btn);
  text-align: center;
  color: #ffffff;
  margin: 40px auto 20px auto;
  line-height: 40px;
  font-weight: 600;
  font-size: 12px;
  box-sizing: border-box;
  padding-top:45px;
  text-decoration: none;
  line-height: 26px;
}

.back-btn a span{
  display: block;
  font-size: 24px;
}

@media only screen and (min-width: 680px) {
  #contents {
    width: 900px;
    margin: 0 auto;
    padding: 100px 0 120px 0;
  }
  #main-cluster {
    padding-top: 0px;
  }
  #main-cluster h1 {
    font-size: 48px;
    line-height: 48px;
    margin-bottom: 20px;
    padding: 0;
  }

  #main-cluster ul.cluster-scope {
    padding: 0;
  }
  ul.cluster-scope li {
    padding: 3px 10px;
    font-size: 12px;
    line-height: 13px;
    border-radius: 20px;
    margin-right: 7px;
  }
  #main-cluster p.read {
    padding: 0;
  }

  .cluster-rule {
    margin-top: 15px;
    padding: 0;
  }

  .cluster-rule strong {
    color:var(--color-primary);
  }

  .cluster-block {
    margin: 0;
    margin-top: 30px;
    background-color: #ffffff;
    border-radius: 5px;
    position: relative;
    box-sizing: border-box;
    padding: 0;
  }

  ul.post-index {
    padding: 50px;
  }
  ul.post-index li {
    width: 240px;
    margin-bottom: 30px;
    padding-bottom: 30px;
    float: left;
    border-bottom: none;
  }
  ul.post-index li:nth-child(2),
  ul.post-index li:nth-child(5),
  ul.post-index li:nth-child(8),
  ul.post-index li:nth-child(11),
  ul.post-index li:nth-child(14) {
    margin-left: 40px;
    margin-right: 40px;
  }
  ul.post-index li:nth-child(13),
  ul.post-index li:nth-child(14),
  ul.post-index li:nth-child(15) {
    margin-bottom: 0;
    padding-bottom: 0;
  }
  ul.post-index li:last-of-type {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
  }
  /*左側
-------------------------------------------------------*/
  ul.post-index .post_thumbnail {
    overflow: hidden;
    width: 100%;
  }
  ul.post-index a img {
    transition-duration: 0.3s;
  }
  /*右側
-------------------------------------------------------*/
  ul.post-index .head {
    width: 100%;
  }
  ul.post-index .head h2 {
    font-size: 16px;
    line-height: 24px;
    margin: 0;
    padding: 0;
    transition-duration: 0.3s;
    overflow: hidden;
  }
  ul.post-index .head h2 span {
    margin: 0;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
  }
  ul.post-index .head .post-title {
    margin-bottom: 10px;
    padding-bottom: 0;
  }
  ul.post-index .head .post-content {
    overflow: hidden;
  }
  ul.post-index .head .post-content p {
    font-size: 13px;
    line-height: 20px;
    margin: 0;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
  }
}