.page-concept .mb-1 {
  margin-bottom: 3rem;
}
@media (min-width: 768px) {
  .page-concept .mb-1 {
    margin-bottom: 6rem;
  }
}
.page-concept__mv {
  width: 100%;
  height: calc(100vh - 6.5rem);
}
@media (min-width: 768px) {
  .page-concept__mv {
    height: calc(100vh - 8rem);
  }
}
.page-concept__mv img {
  display: block;
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
  object-fit: cover;
}

.concept-intro {
  padding-block: 4rem 4rem;
}
@media (min-width: 768px) {
  .concept-intro {
    padding-block: 9.7rem 11rem;
  }
}
.concept-intro__block {
  margin-bottom: 4rem;
}
@media (min-width: 768px) {
  .concept-intro__block {
    margin-bottom: 10rem;
  }
}

.concept-img-1 {
  display: flex;
  justify-content: center;
  max-width: 20rem;
  width: 100%;
  margin-inline: auto;
  margin-bottom: 4rem;
}
@media (min-width: 768px) {
  .concept-img-1 {
    max-width: 36.2rem;
    margin-bottom: 6rem;
  }
}
.concept-img-1 img {
  display: block;
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
  object-fit: cover;
}

.sus-ttl-1 {
  margin-bottom: 4rem;
  text-align: center;
  font-size: 2rem;
  font-weight: 500;
  line-height: 1.8;
  letter-spacing: 0.07em;
}
@media (min-width: 768px) {
  .sus-ttl-1 {
    margin-bottom: 7rem;
    font-size: 2.8rem;
  }
}

.sus-ttl-2 {
  margin-bottom: 4rem;
  text-align: center;
  font-size: 1.8rem;
  font-weight: 500;
  line-height: 1.8;
  letter-spacing: 0.1em;
}
@media (min-width: 768px) {
  .sus-ttl-2 {
    margin-bottom: 5rem;
    font-size: 2.8rem;
  }
}

.sus-txt {
  margin-bottom: 3.5rem;
  font-size: 1.6rem;
  font-weight: 500;
  line-height: 1.8;
  text-align: left;
  letter-spacing: 0.06em;
}
@media (min-width: 768px) {
  .sus-txt {
    margin-bottom: 6rem;
    text-align: center;
  }
}

.concept-sus {
  position: relative;
  padding-block: 3rem 4rem;
  background-color: #F3F1EA;
}
@media (min-width: 768px) {
  .concept-sus {
    padding-block: 14rem 11rem;
  }
}
.concept-sus::after {
  position: absolute;
  z-index: 0;
  inset: 0;
  width: 100%;
  height: 100%;
  background: url("../img/concept/bg_sus.jpg") no-repeat center 100%;
  background-size: 100% auto;
  content: "";
}
.concept-sus .container {
  position: relative;
  z-index: 1;
}
@media (max-width: 767px) {
  .concept-sus .p-intro__desc {
    margin-inline: -1rem;
    font-size: 2rem;
  }
}
@media (max-width: 767px) {
  .concept-sus .sus-ttl-2 {
    margin-inline: -1rem;
  }
}
.concept-sus__achiev-block {
  display: flex;
  justify-content: center;
  margin-bottom: 4rem;
}
@media (min-width: 768px) {
  .concept-sus__achiev-block {
    margin-bottom: 5rem;
  }
}

.l-achiev {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  max-width: 73.5rem;
  width: 100%;
  gap: 1rem;
}
@media (min-width: 768px) {
  .l-achiev {
    justify-content: space-between;
    flex-wrap: nowrap;
    gap: 0;
  }
}
.l-achiev li {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: calc(50% - 0.5rem);
  aspect-ratio: 1/1;
  background: url("../img/concept/bg_sus_circle.svg") no-repeat 50% 50%/contain;
}
@media (min-width: 768px) {
  .l-achiev li {
    width: calc((100% - 6rem) / 3);
  }
}
@media (max-width: 767px) {
  .l-achiev li.item-3 {
    margin-top: -2rem;
  }
}
.l-achiev__wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: calc(100% - 2.8rem);
  height: calc(100% - 2.8rem);
  background-color: #FFF;
  border-radius: 30rem;
}
@media (min-width: 768px) {
  .l-achiev__wrap {
    width: calc(100% - 4rem);
    height: calc(100% - 4rem);
  }
}
.l-achiev__box-ttl {
  display: flex;
  align-items: center;
  margin-bottom: 0.5rem;
}
@media (min-width: 768px) {
  .l-achiev__box-ttl {
    min-height: 7rem;
    margin-bottom: 1rem;
  }
  .l-achiev__box-ttl.custom {
    margin-bottom: 0.5rem;
    padding-top: 1.5rem;
  }
}
.l-achiev__ttl {
  font-weight: 700;
  font-size: 1.4rem;
  line-height: 1.23;
  text-align: center;
}
@media (min-width: 768px) {
  .l-achiev__ttl {
    font-size: 1.8rem;
  }
}
.l-achiev__ttl .num {
  font-size: 1rem;
}
@media (min-width: 768px) {
  .l-achiev__ttl .num {
    font-size: 1.4rem;
  }
}
.l-achiev__txt {
  font-weight: 500;
  font-size: 1.4rem;
  line-height: 1.2;
  text-align: center;
}
@media (min-width: 768px) {
  .l-achiev__txt {
    font-size: 1.1rem;
    line-height: 1.5;
  }
}

.sus-list {
  max-width: 96rem;
  width: 100%;
  margin: 0 auto;
}
.sus-list li {
  display: flex;
  align-items: baseline;
  font-size: 1.4rem;
  font-weight: 500;
  line-height: 1.8;
  letter-spacing: 0.01em;
}
@media (min-width: 768px) {
  .sus-list li {
    font-size: 1.2rem;
  }
}
.concept-outline {
  padding-block: 5rem 5rem;
}
@media (min-width: 768px) {
  .concept-outline {
    padding-block: 10rem 10rem;
  }
}

.acco-ttl {
  position: relative;
  padding: 2rem 4rem 2rem 2rem;
  font-family: var(--font-en);
  font-size: 1.6rem;
  line-height: 1.5;
  color: #FFF;
  background: linear-gradient(to right, #0071B2, #417E8C);
  font-weight: 600;
  text-align: center;
}
@media (min-width: 768px) {
  .acco-ttl {
    padding: 2.5rem 7.5rem 2.5rem 2.5rem;
    font-size: 3rem;
    cursor: pointer;
  }
  .acco-ttl:hover::after {
    animation: smoothArrow 1.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  }
}
.acco-ttl::after {
  position: absolute;
  right: 1.5rem;
  top: 2.8rem;
  width: 1.4rem;
  height: 0.7rem;
  background: url("../img/common/icon_arrow_09.svg") no-repeat center center;
  background-size: 14px auto;
  content: "";
}
@media (min-width: 768px) {
  .acco-ttl::after {
    top: 4rem;
    right: 3rem;
    width: 3rem;
    height: 1.5rem;
    background-size: 27px auto;
  }
}
.acco-ttl.active::after {
  background-image: url("../img/common/icon_arrow_10.svg");
}

.acco-content {
  display: none;
}
.acco-outline {
  margin-bottom: 1px;
}

.outline-list {
  width: 100%;
}
.outline-list.border-bottom {
  border-bottom: 1px solid #4D4D4D;
}
.outline-list li {
  display: flex;
  align-items: center;
  padding-block: 2rem;
  font-size: 1.4rem;
  font-weight: 500;
  line-height: 1.5;
  border-bottom: 1px solid #4D4D4D;
}
.outline-list li:last-child {
  border-bottom: none;
}
@media (min-width: 768px) {
  .outline-list li {
    padding-block: 3rem;
    font-size: 1.8rem;
  }
}
.outline-list__ttl {
  width: 32%;
  padding-inline: 1.5rem 1rem;
}
@media (min-width: 768px) {
  .outline-list__ttl {
    width: 30%;
    padding-inline: 4rem 4rem;
  }
}
.outline-list__txt {
  width: 68%;
  padding-right: 0.8rem;
}
@media (min-width: 768px) {
  .outline-list__txt {
    width: 70%;
    padding-right: 4rem;
  }
}

.outline-banner {
  display: block;
  margin-top: 4rem;
  transition: 0.2s opacity ease-in-out;
}
@media (min-width: 768px) {
  .outline-banner {
    margin-top: 10rem;
  }
  .outline-banner:hover {
    opacity: 0.8;
  }
}
.outline-banner__img img {
  display: block;
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
  object-fit: cover;
}
.outline-banner__link {
  position: relative;
  display: block;
  padding: 2rem 7rem;
  text-align: center;
  font-size: 1.4rem;
  font-weight: 500;
  color: #FFF;
  background: linear-gradient(to right, #0071B2, #417E8C);
  line-height: 1.5;
  letter-spacing: 0.1em;
}
@media (min-width: 768px) {
  .outline-banner__link {
    padding: 1.4rem 5rem;
    font-size: 2rem;
  }
}
.outline-banner__link::after {
  position: absolute;
  right: 1.5rem;
  top: 50%;
  width: 2.1rem;
  height: 0.8rem;
  background: url("../img/common/icon_arrow_11.svg") no-repeat center center;
  background-size: 21px auto;
  transform: translateY(-50%);
  content: "";
}
@media (min-width: 768px) {
  .outline-banner__link::after {
    right: 3rem;
    width: 3.2rem;
    height: 1.2rem;
    background-size: 32px auto;
  }
}