.header {
  background: #999;
}

#page-body{
  background: #999;
}

.features {
  background: #999;
}

.features .js-fade {
  -webkit-transition-duration: 1s;
          transition-duration: 1s;
  opacity: 0;
}

.features .js-fade.active {
  opacity: 1;
}

.features .module__heading {
  position: -webkit-sticky;
  position: sticky;
  z-index: var(--zindex-front);
}

.features .index {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  margin: 0 auto;
  font-style: normal;
  letter-spacing: .05em;
}

.features .index__category {
  color: #737373;
  font-weight: 600;
  -webkit-transition-duration: .2s;
          transition-duration: .2s;
  cursor: pointer;
}

.features .index__category.current {
  color: var(--color-basis);
}

.features .archive__wrapper--features {
  position: relative;
}

.features .archive__block--features {
  display: -ms-grid;
  display: grid;
}

.features .archive__block--features .archive__unit {
  display: none;
}

.features .archive__block--features .archive__unit .image {
  overflow: hidden;
  background-color: rgba(255, 255, 255, 0.2);
}

.features .archive__block--features .archive__unit .image img {
  -webkit-transition-duration: .2s;
          transition-duration: .2s;
}

.features .archive__block--features .archive__unit:hover .image img {
  -webkit-transform: scale(1.1);
          transform: scale(1.1);
}

.features .archive__block--features .archive__unit:hover .summary {
  color: #737373;
}

.features .archive__block--features .archive__unit a:hover {
  opacity: 1;
}

.features .archive__block--features .summary {
  position: relative;
  z-index: var(--zindex-front);
  -webkit-transition-duration: .2s;
          transition-duration: .2s;
}

.features .archive__block--features .summary__switch {
  display: inline-block;
  border: 1px solid #000;
  text-align: center;
}

.features .archive__block--features .summary__date {
  letter-spacing: .1em;
}

.features .archive__block--features .summary__title {
  font-weight: 700;
  white-space: nowrap;
}

.features .archive__block--features .summary__desc {
  letter-spacing: .1em;
}

.features .c-breadcrumb {
  margin-top: 100px;
  padding: 0;
}

/*
//////////////////////////////////////////////////////////////////////////////////////////////
                                          for desktop
//////////////////////////////////////////////////////////////////////////////////////////////
*/
@media screen and (min-width: 768px) {
  .features {
    padding: 0 0 160px;
  }
  .features__contents {
    max-width: 1080px;
    margin: auto;
    padding: 75px 30px 0;
  }
  .features .module__heading {
    top: 30px;
  }
  .features .index {
    max-width: 1020px;
    padding-bottom: 10px;
    border-bottom: 1px solid #000;
    font-size: 30px;
  }
  .features .index__category:not(:nth-of-type(1)) {
    margin-left: 60px;
  }
  .features .archive__block--features {
    margin-top: 50px;
    padding-left: 20px;
    grid-template-columns: 44.5rem 44.5rem;
    column-gap: 11rem;
    row-gap: 85px;
  }
  .features .archive__block--features .archive__unit .image {
    margin-left: 2.4rem;
  }
  .features .archive__block--features .summary {
    margin-top: -60px;
  }
  .features .archive__block--features .summary__switch {
    padding: 5px 10px;
    font-size: 10px;
    letter-spacing: 0.08em;
  }
  .features .archive__block--features .summary__date {
    margin-top: 10px;
    font-size: 13px;
  }
  .features .archive__block--features .summary__title {
    margin-top: 25px;
    font-size: 4.5rem;
    letter-spacing: 0;
  }
  .features .archive__block--features .summary__desc {
    margin-top: 10px;
    font-size: 1.8rem;
    line-height: 1.5555555556;
  }
}

/*
//////////////////////////////////////////////////////////////////////////////////////////////
                                        for mobile phone
//////////////////////////////////////////////////////////////////////////////////////////////
*/
@media screen and (max-width: 767px) {
  .features {
    padding: 0 0 25.33333vw;
  }
  .features__contents {
    padding-top: 16.33333vw;
    padding-left: 13.33333vw;
  }
  .features .module__heading {
    top: 18.33333vw;
  }
  .features .index {
    -ms-flex-wrap: wrap;
        flex-wrap: wrap;
        padding-bottom: 2.1vw;
    font-size: 6vw;
    border-bottom: 1px solid #000;
  }
  .features .index__category:not(:nth-of-type(1)) {
    margin-top: 4vw;
  }
  .features .archive__block--features {
    margin-top: 7vw;
    gap: 16.66667vw 0;
  }
  .features .archive__block--features .summary {
    margin-top: 5.33333vw;
  }
  .features .archive__block--features .summary__switch {
    font-size: 1.8vw;
    padding: 1.33333vw 1.73333vw;
    letter-spacing: 0.1em;
  }
  .features .archive__block--features .summary__date {
    margin-left: 1.33333vw;
    display: inline-block;
    font-size: 2.66667vw;
    -webkit-transform: translateY(75%);
            transform: translateY(75%);
    -webkit-transform-origin: left top;
            transform-origin: left top;
  }
  .features .archive__block--features .summary__title {
    margin-top: 2.66667vw;
    font-size: 8vw;
    letter-spacing: 0.01em;
  }
  .features .archive__block--features .summary__desc {
    margin-top: 4.66667vw;
    padding-right: 10.66667vw;
    font-size: 4vw;
    line-height: 1.625;
  }
  .features .archive__unit {
    width: 100%;
  }
  .features .archive__unit .image {
    width: 100%;
  }
  .features .c-breadcrumb {
    margin-top: 17.33333vw;
  }
  .top_button {
    /* margin: calc(-110 *(100vw / 750)) 0 calc(40 *(100vw / 750)) calc(645 *(100vw / 750)); */
    position: absolute;
    top: calc(-110 * 100vw / 750);
    right: calc(35 * 100vw / 750);
    margin: 0;
  }
}