@media screen and (max-width: 767.999px) {
  .btn a {
    font-size: 1.6rem;
    width: 270px;
    padding: 17px 0 17px;
    border-radius: 30px;
  }
  .btn a::after {
    position: absolute;
    top: 50%;
    right: 22px;
  }
  h2 span.en {
    font-size: 4rem;
  }
  h2 span.ja {
    font-size: 1.4rem;
    margin-top: 15px;
  }
  #top_main_img_area {
    background: url(../img/client_index/mv_sp.jpg) no-repeat;
    background-position: bottom center;
    background-size: cover;
    height: 100vh;
    padding-bottom: 32.67vw;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  #top_main_img_area #main_copy {
    font-size: 6.8rem;
    line-height: 1;
    font-family: 'Times New Roman', Times, serif;
    padding: 0 70px 0 26px;
  }
  #top_main_img_area #sub_copy {
    font-size: 1.6rem;
    line-height: 1.5;
    margin-top: 15px;
    padding-left: 30px;
  }
  #top_main_img_area #main_side_navi {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 60px;
    z-index: 50;
  }
  #top_main_img_area #main_side_navi li:nth-of-type(1) {
    margin-bottom: 18px;
  }
  #first_contents_area {
    margin-top: -32.67vw;
  }
  #first_contents_area #sincerity_area {
    min-height: 32.67vw;
  }
  #first_contents_area #sincerity_area h2 {
    font-size: 2.4rem;
    line-height: 1.33;
    transform: translateY(-15px);
    text-align: center;
    font-weight: normal;
  }
  #first_contents_area #sincerity_area .btn a {
    margin: calc(35px - 1em) auto 0;
  }
  #top_anniversary_area {
    position: relative;
  }
  #top_anniversary_area h2 {
    position: relative;
  }
  #top_anniversary_area h2::before {
    content: "";
    position: absolute;
    width: 40px;
    height: 1px;
    background: #503c18;
    top: -35px;
    left: 0;
  }
  #top_anniversary_area::after {
    content: "";
    position: absolute;
    width: 40px;
    height: 1px;
    background: #503c18;
    bottom: 75px;
    left: 30px;
  }
  #works_area h2,
  #project h2 {
    transform: translateY(-20px);
    padding-right: 30px;
    padding-left: 30px;
  }
  #works_area h2 .ja,
  #project h2 .ja {
    margin-top: 12px;
  }
  #works_area h3,
  #project h3 {
    margin-top: 24px;
    padding-right: 30px;
    padding-left: 30px;
    font-size: 2.2rem;
    line-height: 1.47;
    text-align: center;
    font-weight: 500;
  }
  #works_area .description,
  #project .description {
    margin-top: 26px;
    padding-right: 30px;
    padding-left: 30px;
    line-height: 1.71;
  }
  #works_area .result_wrapper,
  #project .result_wrapper {
    margin-top: 45px;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
  }
  #works_area .result_wrapper .result_list,
  #project .result_wrapper .result_list {
    padding: 0 30px 0 0;
    overflow: hidden;
    display: table;
    width: calc(207.9vw + 90px);
    overflow-y: auto;
  }
  #works_area .result_wrapper .result_list > li,
  #project .result_wrapper .result_list > li {
    display: table-cell;
    vertical-align: top;
    width: 69.3vw;
    padding-left: 30px;
  }
  #works_area .result_wrapper .result_list > li .image_area .img,
  #project .result_wrapper .result_list > li .image_area .img {
    width: 69.3vw;
    height: 69.3vw;
  }
  #works_area .result_wrapper .result_list > li .image_area .img img,
  #project .result_wrapper .result_list > li .image_area .img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
  #works_area .result_wrapper .result_list > li .image_area h4,
  #project .result_wrapper .result_list > li .image_area h4 {
    width: 50%;
    font-size: 1.3rem;
    padding: 2px 0 1px;
    line-height: 1;
  }
  #works_area .result_wrapper .result_list > li .image_area h4 .num,
  #project .result_wrapper .result_list > li .image_area h4 .num {
    font-size: 3.8rem;
    margin-left: 7px;
    padding-bottom: 5px;
    letter-spacing: 0;
  }
  #works_area .result_wrapper .result_list > li .image_area img,
  #project .result_wrapper .result_list > li .image_area img {
    width: 100%;
    height: auto;
  }
  #works_area .result_wrapper .result_list > li .place,
  #project .result_wrapper .result_list > li .place {
    margin-top: 20px;
    display: flex;
  }
  #works_area .result_wrapper .result_list > li .place li,
  #project .result_wrapper .result_list > li .place li {
    border-left: 1px solid #FFFFFF;
    font-size: 1.3rem;
    padding: 0;
    line-height: 1;
  }
  #works_area .result_wrapper .result_list > li .place li:nth-of-type(1),
  #project .result_wrapper .result_list > li .place li:nth-of-type(1) {
    border-left: none;
    padding-right: 20px;
  }
  #works_area .result_wrapper .result_list > li .place li:nth-of-type(2),
  #project .result_wrapper .result_list > li .place li:nth-of-type(2) {
    padding-left: 20px;
  }
  #works_area .result_wrapper .result_list > li h5.name,
  #project .result_wrapper .result_list > li h5.name {
    font-size: 1.6rem;
    line-height: 1.56;
    margin-top: 13px;
    font-weight: normal;
  }
  #works_area .result_wrapper .result_list > li .txt,
  #project .result_wrapper .result_list > li .txt {
    line-height: 1.71;
    padding: 10px 40px 0 0;
    position: relative;
  }
  #works_area .result_wrapper .result_list > li .txt::after,
  #project .result_wrapper .result_list > li .txt::after {
    content: "";
    display: block;
    width: 20px;
    height: 20px;
    border-right: 1px solid #FFFFFF;
    border-top: 1px solid #FFFFFF;
    position: absolute;
    top: 5px;
    right: 0;
    transform: rotate(45deg);
  }
  #works_area .btn,
  #project .btn {
    margin-top: 42px;
  }
  #works_area {
    padding: 0 0 113px;
    position: relative;
    background: linear-gradient(180deg, #1b2233 0%, #1b2233 77.33vw, #000000 77.33vw, #000000 100%);
  }
  #works_area::after {
    content: "";
    position: absolute;
    right: 0;
    top: 36vw;
    width: 50%;
    height: 82.667vw;
    background: linear-gradient(to bottom right, transparent 50%, #261d0d 50.1%) no-repeat top left/100% 50%, linear-gradient(to top right, transparent 50%, #261d0d 50.1%) no-repeat bottom left/100% 50%;
    z-index: 3;
  }
  #works_area::before {
    content: "";
    position: absolute;
    left: 0;
    top: 36vw;
    width: 50vw;
    height: 82.667vw;
    background: linear-gradient(to bottom left, transparent 50%, #000e2a 50.1%) no-repeat top left/100% 50%, linear-gradient(to top left, transparent 50%, #000e2a 50.1%) no-repeat bottom left/100% 50%;
    z-index: 3;
  }
  #works_area .contents_wrapper > * {
    z-index: 15;
    position: relative;
  }
  #project {
    padding: 0 0 80px;
    background: linear-gradient(180deg, #001238 0%, #001238 36vw, #000000 36vw, #000000 100%);
    position: relative;
  }
  #project::before {
    content: "";
    position: absolute;
    left: 0;
    top: 36vw;
    width: 100vw;
    height: 200vw;
    background: linear-gradient(to bottom left, #001238 50%, #000000 50%) no-repeat top left/100% 50%;
    z-index: 2;
  }
  #project > * {
    z-index: 15;
    position: relative;
  }
  #project .result_wrapper .result_list > li h5.name {
    margin-top: 17px;
  }
  #about {
    background: #242524 url(../img/client_index/about_bg_sp.jpg) no-repeat;
    background-position: top center;
    background-size: 100% auto;
  }
  #about h2 {
    transform: translateY(-1.1em);
  }
  #about .contents_area {
    padding: calc(71.5vw - 3em) 30px 75px;
  }
  #about .contents_area .about_area h4 {
    font-size: 2.4rem;
    line-height: 1.33;
    text-align: center;
    font-weight: normal;
  }
  #about .contents_area .about_area .txt {
    margin-top: 24px;
    line-height: 1.71;
  }
  #about .contents_area .about_area .btn a {
    margin: 33px auto 0;
    text-align: center;
  }
  #about .about_link {
    padding: 0 5px 50px;
  }
  #about .about_link li {
    padding: 20px 55px 0;
  }
  #about .about_link li:first-child {
    padding-top: 44px;
  }
  #about .about_link li.big {
    padding: 5px 0 0;
  }
  #about .about_link li.big + li:not(.big) {
    padding-top: 44px;
  }
  #about .about_link li img {
    width: 100%;
    height: auto;
  }
  #top_contact {
    padding: 75px 30px 85px;
  }
}