@-webkit-keyframes intro-bg-anim-pc-01 {
  0% {
    -webkit-transform: translateX(-100px);
            transform: translateX(-100px);
  }
  100% {
    -webkit-transform: translateX(-2956px);
            transform: translateX(-2956px);
  }
}
@keyframes intro-bg-anim-pc-01 {
  0% {
    -webkit-transform: translateX(-100px);
            transform: translateX(-100px);
  }
  100% {
    -webkit-transform: translateX(-2956px);
            transform: translateX(-2956px);
  }
}
@-webkit-keyframes intro-bg-anim-pc-02 {
  0% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  100% {
    -webkit-transform: translateX(-2856px);
            transform: translateX(-2856px);
  }
}
@keyframes intro-bg-anim-pc-02 {
  0% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  100% {
    -webkit-transform: translateX(-2856px);
            transform: translateX(-2856px);
  }
}
@-webkit-keyframes intro-bg-anim-sp-01 {
  0% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  100% {
    -webkit-transform: translateX(-396.8vw);
            transform: translateX(-396.8vw);
  }
}
@keyframes intro-bg-anim-sp-01 {
  0% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
  100% {
    -webkit-transform: translateX(-396.8vw);
            transform: translateX(-396.8vw);
  }
}
@-webkit-keyframes intro-bg-anim-sp-02 {
  0% {
    -webkit-transform: translateX(-396.8vw);
            transform: translateX(-396.8vw);
  }
  100% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
}
@keyframes intro-bg-anim-sp-02 {
  0% {
    -webkit-transform: translateX(-396.8vw);
            transform: translateX(-396.8vw);
  }
  100% {
    -webkit-transform: translateX(0);
            transform: translateX(0);
  }
}
.about-index-intro {
  position: relative;
}
.about-index-intro__content {
  padding: 160px 80px;
  text-align: center;
  background-color: rgba(255, 255, 255, 0.95);
}
@media screen and (min-width: 768px) {
  .about-index-intro__content {
    position: absolute;
    top: 0;
    left: 50%;
    -webkit-transform: translateX(-50%);
            transform: translateX(-50%);
    z-index: 2;
    width: 740px;
    height: 100%;
  }
}
@media screen and (max-width: 767px) {
  .about-index-intro__content {
    padding: 24vw 0;
  }
}
.about-index-intro__content img {
  will-change: opacity;
}
.about-index-intro__content__logo {
  display: inline-block;
  text-align: center;
  width: 236px;
  height: 412px;
}
@media screen and (max-width: 767px) {
  .about-index-intro__content__logo {
    width: calcvw(164);
    height: 76.8vw;
  }
}
.about-index-intro__content__logo .logo {
  width: 231px;
  height: 203px;
}
@media screen and (max-width: 767px) {
  .about-index-intro__content__logo .logo {
    width: calcvw(161);
    height: 37.8666666667vw;
  }
}
.about-index-intro__content__logo .kokoro {
  margin-top: 35px;
  width: 209px;
}
@media screen and (max-width: 767px) {
  .about-index-intro__content__logo .kokoro {
    margin-top: 6.4vw;
    width: 38.9333333333vw;
  }
}
.about-index-intro__content__logo .sumida {
  margin-top: 21px;
  width: 215px;
}
@media screen and (max-width: 767px) {
  .about-index-intro__content__logo .sumida {
    margin-top: 4vw;
    width: 40vw;
  }
}
.about-index-intro__content__lead {
  margin: 100px auto 110px;
}
@media screen and (max-width: 767px) {
  .about-index-intro__content__lead {
    margin: 18.6666666667vw auto 18.6666666667vw;
  }
}
.about-index-intro__content__lead .letter {
  opacity: 0;
  will-change: opacity;
}
.about-index-intro__content__lead .line {
  display: inline-block;
  position: relative;
  padding-bottom: 0.18em;
  font-family: "Shippori Mincho", serif;
  line-height: 2.1;
  font-size: 3.2rem;
}
@media screen and (max-width: 767px) {
  .about-index-intro__content__lead .line {
    font-size: 5.3333333333vw;
    line-height: 2.7;
  }
}
.about-index-intro__content__lead .line .border {
  content: "";
  display: block;
  width: 100%;
  height: 2px;
  background-color: #325F96;
  position: absolute;
  bottom: 0;
  left: 0;
  will-change: width;
}
@media screen and (max-width: 767px) {
  .about-index-intro__content__lead .line .border {
    height: 0.5333333333vw;
  }
}
.about-index-intro__content__text {
  margin-top: 65px;
  font-size: 2rem;
  line-height: 2.4;
  text-align: center;
}
@media screen and (max-width: 767px) {
  .about-index-intro__content__text {
    margin-top: 9.3333333333vw;
    font-size: 4.2666666667vw;
    line-height: 2.375;
  }
}
.about-index-intro__content__text .letter {
  opacity: 0;
  will-change: opacity;
}
.about-index-intro__btn-text {
  margin-top: 65px;
}
@media screen and (max-width: 767px) {
  .about-index-intro__btn-text {
    margin-top: 9.3333333333vw;
  }
}
.about-index-intro__bg {
  width: 100%;
  height: 1904px;
  overflow: hidden;
}
@media screen and (max-width: 767px) {
  .about-index-intro__bg {
    height: 66.1333333333vw;
  }
}
.about-index-intro__bg__item {
  width: 5712px;
  height: 476px;
}
@media screen and (max-width: 767px) {
  .about-index-intro__bg__item {
    width: 793.6vw;
    height: 33.0666666667vw;
  }
}
.about-index-intro__bg__item img {
  display: inline;
  width: auto;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transform: translate3d(0, 0, 0);
          transform: translate3d(0, 0, 0);
  will-change: transform;
}
.about-index-intro__bg__item--pc--01 img {
  -webkit-transform: translateX(-100px);
          transform: translateX(-100px);
  -webkit-animation: 60s linear infinite normal none running intro-bg-anim-pc-01;
          animation: 60s linear infinite normal none running intro-bg-anim-pc-01;
}
.about-index-intro__bg__item--pc--02 img {
  -webkit-transform: translateX(-100px);
          transform: translateX(-100px);
  animation: 60s linear infinite reverse none running intro-bg-anim-pc-01;
}
.about-index-intro__bg__item--pc--03 img {
  -webkit-animation: 60s linear infinite normal none running intro-bg-anim-pc-02;
          animation: 60s linear infinite normal none running intro-bg-anim-pc-02;
}
.about-index-intro__bg__item--pc--04 img {
  animation: 60s linear infinite reverse none running intro-bg-anim-pc-02;
}
.about-index-intro__bg__item--sp--02 img {
  -webkit-animation: 45s linear infinite normal none running intro-bg-anim-sp-01;
          animation: 45s linear infinite normal none running intro-bg-anim-sp-01;
}
.about-index-intro__bg__item--sp--01 img {
  -webkit-transform: translateX(-396.8vw);
          transform: translateX(-396.8vw);
  -webkit-animation: 45s linear infinite normal none running intro-bg-anim-sp-02;
          animation: 45s linear infinite normal none running intro-bg-anim-sp-02;
}

@media screen and (max-width: 767px) {
  .about-activity::before {
    -webkit-animation: none;
            animation: none;
    -webkit-mask-position: left;
            mask-position: left;
  }
}

.about-sumida-section {
  padding-top: 160px;
  padding-bottom: 160px;
  background-color: #fff;
}
@media screen and (max-width: 767px) {
  .about-sumida-section {
    padding-top: 26.6666666667vw;
    padding-bottom: 26.6666666667vw;
  }
}
.about-sumida-purpose {
  position: relative;
  background-color: #F5F5F5;
}
.about-sumida-purpose::before {
  content: "";
  width: calc(100% + 1260px);
  height: 8px;
  background-color: #F5F5F5;
  -webkit-mask-image: url(../images/common/bg_wave.svg);
          mask-image: url(../images/common/bg_wave.svg);
  -webkit-mask-repeat: repeat-x;
          mask-repeat: repeat-x;
  -webkit-mask-position: center;
          mask-position: center;
  position: absolute;
  top: -6px;
  left: 0;
  -webkit-animation: wave 60s linear infinite;
          animation: wave 60s linear infinite;
  z-index: 2;
}
.about-sumida-purpose__text {
  display: block;
  text-align: center;
  font-size: 1.6rem;
  line-height: 2.375;
}
@media screen and (max-width: 767px) {
  .about-sumida-purpose__text {
    font-size: 4.2666666667vw;
  }
}
.about-sumida-purpose__text .letter {
  opacity: 0;
}
.about-sumida-purpose__text + .about-sumida-purpose__text {
  margin-top: 46px;
}
@media screen and (max-width: 767px) {
  .about-sumida-purpose__text + .about-sumida-purpose__text {
    margin-top: 10.6666666667vw;
  }
}
.about-sumida-window {
  position: relative;
  overflow: hidden;
  width: 100%;
  height: 34.2857142857vw;
}
@media screen and (max-width: 767px) {
  .about-sumida-window {
    height: 53.3333333333vw;
  }
}
.about-sumida-window img {
  position: absolute;
  left: 0;
  will-change: top;
}
.about-sumida-logomark {
  padding-bottom: 0;
}
.about-sumida-logomark__figure {
  display: block;
  text-align: center;
  width: 264px;
  height: 460px;
  margin: auto;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__figure {
    width: calcvw(164);
    height: 76.8vw;
  }
}
.about-sumida-logomark__figure .logo {
  width: 260px;
  height: 228px;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__figure .logo {
    width: calcvw(161);
    height: 37.8666666667vw;
  }
}
.about-sumida-logomark__figure .kokoro {
  margin-top: 35px;
  width: 234px;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__figure .kokoro {
    margin-top: 6.4vw;
    width: 38.9333333333vw;
  }
}
.about-sumida-logomark__figure .sumida {
  margin-top: 21px;
  width: 240px;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__figure .sumida {
    margin-top: 4vw;
    width: 40vw;
  }
}
.about-sumida-logomark__about {
  max-height: 0;
  overflow: hidden;
  -webkit-transition: max-height 0.4s ease, padding 0.4s ease;
  transition: max-height 0.4s ease, padding 0.4s ease;
  margin-top: 40px;
  background-color: #F5F7FA;
  width: 768px;
  margin-inline: auto;
  padding-block: 0;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__about {
    margin-top: 8vw;
    width: 89.3333333333vw;
  }
}
.about-sumida-logomark__about.is-open {
  max-height: 1000px;
  padding-block: 60px;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__about.is-open {
    padding-block: 10.6666666667vw;
  }
}
.about-sumida-logomark__about__item {
  text-align: center;
}
.about-sumida-logomark__about__item + .about-sumida-logomark__about__item {
  margin-top: 40px;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__about__item + .about-sumida-logomark__about__item {
    margin-top: 10.6666666667vw;
  }
}
.about-sumida-logomark__about__item h3 {
  font-size: 1.8rem;
  line-height: 1.5555555556;
  color: #325F96;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__about__item h3 {
    font-size: 4.2666666667vw;
  }
}
.about-sumida-logomark__about__item h4 {
  margin-top: 13px;
  font-size: 2.8rem;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__about__item h4 {
    margin-top: 3.2vw;
    font-size: 5.8666666667vw;
  }
}
.about-sumida-logomark__about__item p {
  margin-top: 33px;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__about__item p {
    margin-top: 5.6vw;
    font-size: 4.2666666667vw;
  }
}
.about-sumida-logomark__link {
  margin-top: 80px;
  text-align: center;
}
@media screen and (max-width: 767px) {
  .about-sumida-logomark__link {
    margin-top: 10.6666666667vw;
  }
}
.about-sumida-statement__figure {
  text-align: center;
}
.about-sumida-statement__figure img {
  width: 580px;
  height: 467px;
}
@media screen and (max-width: 767px) {
  .about-sumida-statement__figure img {
    width: 89.3333333333vw;
    height: 71.7333333333vw;
  }
}
.about-sumida-philosophy {
  background-color: #fff;
  padding-bottom: 190px;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy {
    padding-bottom: 40vw;
  }
}
.about-sumida-philosophy__text {
  display: block;
  text-align: center;
  font-size: 1.6rem;
  line-height: 2.375;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__text {
    font-size: 4.2666666667vw;
  }
}
.about-sumida-philosophy__text + .about-sumida-philosophy__text {
  margin-top: 46px;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__text + .about-sumida-philosophy__text {
    margin-top: 10.6666666667vw;
  }
}
.about-sumida-philosophy__list {
  margin: 100px auto;
  width: 1200px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__list {
    margin: 21.3333333333vw auto;
    width: 81.8666666667vw;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
  }
}
.about-sumida-philosophy__item {
  width: 300px;
  text-align: center;
  padding: 25px 0;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__item {
    width: 100%;
    padding: 6.6666666667vw;
  }
}
.about-sumida-philosophy__item .num {
  font-family: "Poppins", sans-serif;
  font-size: 5.6rem;
  font-weight: 600;
  line-height: 1;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__item .num {
    font-size: 14.9333333333vw;
  }
}
.about-sumida-philosophy__item .text {
  margin-top: 4px;
  font-family: "Shippori Mincho", serif;
  font-size: 2.4rem;
  line-height: 1.5;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__item .text {
    font-size: 6.4vw;
  }
}
.about-sumida-philosophy__item figure {
  background-color: #fff;
  width: 160px;
  height: 160px;
  margin: 40px auto 18px;
  clip-path: circle(50% at 50% 50%);
  display: -ms-grid;
  display: grid;
  place-items: center;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__item figure {
    width: 43.4666666667vw;
    height: 43.4666666667vw;
    margin: 12.5333333333vw auto 4.8vw;
  }
}
.about-sumida-philosophy__item figure img {
  width: 105px;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__item figure img {
    width: 28vw;
  }
}
.about-sumida-philosophy__item .cat .en {
  display: block;
  font-family: "Poppins", sans-serif;
  font-size: 2.8rem;
  line-height: 1.7142857143;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__item .cat .en {
    font-size: 7.4666666667vw;
  }
}
.about-sumida-philosophy__item .cat .ja {
  display: block;
  font-size: 1.8rem;
  line-height: 1.5555555556;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__item .cat .ja {
    font-size: 4.8vw;
  }
}
.about-sumida-philosophy__item--01 {
  background-color: #ECF5F2;
}
.about-sumida-philosophy__item--01 .num, .about-sumida-philosophy__item--01 .cat {
  color: #40967B;
}
.about-sumida-philosophy__item--02 {
  background-color: #EEF4FA;
}
.about-sumida-philosophy__item--02 .num, .about-sumida-philosophy__item--02 .cat {
  color: #4F8CC6;
}
.about-sumida-philosophy__item--03 {
  background-color: #FBF7E8;
}
.about-sumida-philosophy__item--03 .num, .about-sumida-philosophy__item--03 .cat {
  color: #D3A81B;
}
.about-sumida-philosophy__item--04 {
  background-color: #F3F0F6;
}
.about-sumida-philosophy__item--04 .num, .about-sumida-philosophy__item--04 .cat {
  color: #7D629F;
}
.about-sumida-philosophy__link {
  text-align: center;
}
.about-sumida-philosophy__link__text {
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.6666666667;
  color: #325F96;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__link__text {
    font-size: 5.3333333333vw;
  }
}
.about-sumida-philosophy__link__btn {
  margin-top: 40px;
}
@media screen and (max-width: 767px) {
  .about-sumida-philosophy__link__btn {
    margin-top: 10.6666666667vw;
  }
}