.research-top {
  overflow-x: hidden;
}

.research-page-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.research-circle-right-img {
  position: absolute;
  right: -50px;
  top: 350px;
  width: 227px;
  height: 227px;
}

.research-circle {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  background-color: var(--title-text-light-blue);
  border-radius: 50%;
}

.research-section-title-blue {
  text-align: center;
  margin: 0 0 40px;
  font-size: 40px;
  font-weight: 700;
  color: var(--title-text-dark-blue);
}

.research-top .page-inner {
  margin: auto;
  padding: 80px 120px;
}

/* ========================================================================== */
/* research-lead */
/* ========================================================================== */

.research-lead {
  position: relative;
  overflow: visible;
  margin-top: 80px;
  background: #EDF0F5;
  z-index: 1;
}

.research-lead__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

.research-lead__bg-circle {
  position: absolute;
  left: 0px;
  top: 72%;
  width: 105px;
  height: 105px;
  transform: translateY(-50%) rotate(33.923deg);
}

.research-lead .page-inner {
  position: relative;
  z-index: 1;
}

.research-lead__headline {
  text-align: center;
  color: var(--title-text-dark-blue);
  font-weight: 600;
  font-size: 32px;
  line-height: 56px;
  /* 175% */
  letter-spacing: 1.28px;
  margin: 0 0 32px;
}

.research-lead__text {
  max-width: 1200px;
  margin: 0 auto;
  font-size: 16px;
  line-height: 30px;
  /* 187.5% */
  letter-spacing: 0.64px;
  color: #000;
  text-align: center;
}

/* ========================================================================== */
/* research-area */
/* ========================================================================== */

.research-area {
  width: 100%;
}

.research-area__head {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  margin-bottom: 40px;
}

.research-area__title {
  font-size: 40px;
  font-weight: var(--title-weight);
  color: var(--title-text-light-blue);
}

.research-area-bottom {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  align-self: stretch;
}

.research-area-bottom-box {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  align-self: stretch;
  border-radius: 8px;
  background: #F3F7F9;
}

.research-area-bottom-top {
  display: flex;
  padding: 16px 40px;
  justify-content: space-between;
  align-items: center;
  align-self: stretch;
  border-radius: 8px;
  background: #F3F7F9;
  cursor: pointer;
  transition: border-radius 0.3s;
}

.research-area-bottom-box.is-open .research-area-bottom-top {
  border-radius: 8px 8px 0 0;
  padding: 24px 40px 8px 40px;
}

.research-area-bottom-top-box {
  display: flex;
  width: 117px;
  align-items: center;
  gap: 12px;
}

.research-area-bottom-title {
  color: var(--title-text-light-blue);
  text-align: center;
  font-size: 24px;
  font-weight: var(--title-weight);
  line-height: 32px;
  letter-spacing: 0.96px;
  white-space: nowrap;
  text-align: left;
}

.research-area-bottom-detail {
  display: none;
  padding: 8px 40px 24px 40px;
  align-items: flex-start;
  gap: 40px;
  align-self: stretch;
  border-radius: 0 0 8px 8px;
  background: #F3F7F9;
  line-height: 30px;
  letter-spacing: 0.64px;
}

.research-area-bottom-box.is-open .research-area-bottom-detail {
  display: flex;
}

/* ========================================================================== */
/* research-oi-cards */
/* ========================================================================== */

.research-oi-cards {
  display: grid;
  gap: 40px;
}

.research-oi-card {
  border: 2px solid #0B318F;
  border-radius: 56px;
  background: #fff;
  overflow: hidden;

  display: grid;
  grid-template-columns: 55% 45%;
  align-items: center;
  gap: 40px;
  padding: 0 56px;
  box-sizing: border-box;
}

.research-oi-media {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
  align-items: center;
}

.research-oi-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 24px;
  display: block;
}

.research-oi-media__col {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.research-oi-media__col--up {
  transform: translateY(-20px);
}

.research-oi-media__col--down {
  transform: translateY(20px);
}

.research-oi-content {
  display: flex;
  flex-direction: column;
  padding: 24px 40px 24px 0;
}

.research-oi-title {
  margin: 0 0 16px;
  font-size: 36px;
  font-weight: 600;
  line-height: 48px;
  letter-spacing: 1.44px;
  color: var(--title-text-dark-blue);
}

.research-oi-lead {
  margin: 0 0 16px;
  line-height: 30px;
  letter-spacing: 0.64px;
  color: var(--title-text-dark-blue);
}

.research-oi-lead--note {
  font-size: 10px;
  letter-spacing: 0.4px;
}

.research-oi-note {
  margin: 0 0 24px;
  font-size: 10px;
  line-height: 18px;
  letter-spacing: 0.4px;
}

.research-oi-more {
  display: inline-flex;
  align-items: center;
  gap: 24px;
  align-self: flex-end;
}

.research-oi-more__text {
  color: var(--title-text-dark-blue);
  line-height: 24px;
  letter-spacing: 0.64px;
}

.research-oi-more__icon {
  width: 56px;
  height: 56px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.research-oi-more__icon img {
  width: 100%;
  height: 100%;
  display: block;
}

.research-oi-card--reverse .research-oi-media {
  order: 2;
}

.research-oi-card--reverse .research-oi-content {
  order: 1;
}

.research-oi-card--accent .research-oi-title,
.research-oi-card--accent .research-oi-lead,
.research-oi-card--accent .research-oi-more__text {
  color: var(--title-text-light-blue);
}

.research-oi-card--accent {
  grid-template-columns: 45% 55%;
  border-color: #009CE2;
}

.research-oi-card--accent .research-oi-note {
  color: var(--title-text-light-blue);
}

/* ========================================================================== */
/* research-links */
/* ========================================================================== */

.research-link-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 56px;
}

.research-link-card {
  display: grid;
  grid-template-rows: auto auto;
  border-radius: 16px;
  overflow: hidden;
  background: #fff;
  text-decoration: none;
}

.research-link-card__bg {
  width: 100%;
  object-fit: cover;
  display: block;
}

.research-link-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 24px 16px;
  background: #fff;
}

.research-link-card__title {
  font-size: 36px;
  font-weight: 600;
  line-height: 48px;
  letter-spacing: 1.44px;
}

.research-link-card__btn {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

.research-link-card__btn img {
  width: 100%;
  height: 100%;
  display: block;
}

.research-link-card--blue .research-link-card__title {
  color: var(--title-text-dark-blue);
}

.research-link-card--sky .research-link-card__title {
  color: var(--title-text-light-blue);
}

/* ========================================================================== */
/* @media：TB */
/* ========================================================================== */

@media (max-width: 1023px) {

  .research-circle-right-img {
    position: absolute;
    right: -50px;
    top: 180px;
    width: 160px;
    height: 160px;
  }

  .research-section-title-blue {
    text-align: center;
    margin: 0 0 24px;
    font-size: 32px;
    font-weight: 700;
  }

  .research-top .page-inner {
    margin: auto;
    padding: 64px 64px;
  }

  /* ==================================================== */
  /* research-lead */
  /* ==================================================== */

  .research-lead__bg-circle {
    position: absolute;
    left: 0px;
    top: 91%;
    width: 105px;
    height: 105px;
    transform: translateY(-50%) rotate(33.923deg);
  }

  .research-lead__headline {
    font-size: 24px;
    margin: 0 0 16px;
    line-height: 40px;
  }

  .research-lead__text {
    margin: 0 auto;
    font-size: 14px;
  }

  /* ==================================================== */
  /* research-area */
  /* ==================================================== */

  .research-area__title {
    font-size: 32px;
  }

  .research-area-bottom-top {
    display: flex;
    padding: 16px 16px;
  }

  .research-area-bottom-title {
    font-size: 20px;
  }

  /* ==================================================== */
  /* research-oi-cards */
  /* ==================================================== */

  .research-oi-card {
    grid-template-columns: 1fr;
  }

  .research-oi-card--reverse {
    grid-template-columns: 1fr;
  }

  .research-oi-content {
    display: flex;
    flex-direction: column;
    padding: 24px 0px 24px 0;
  }

  .research-oi-title {
    margin: 0 0 16px;
    font-size: 24px;
    font-weight: 600;
    line-height: 48px;
    letter-spacing: 1.44px;
    color: var(--title-text-dark-blue);
  }

  .research-oi-lead {
    font-size: 14px;
    margin: 0 0 8px;
    line-height: 30px;
    letter-spacing: 0.64px;
    color: var(--title-text-dark-blue);
  }

  .research-oi-note {
    margin: 0 0 24px;
    font-size: 10px;
    line-height: 18px;
    letter-spacing: 0.4px;
  }

  .research-oi-media {
    order: 2;
  }

  .research-oi-content {
    order: 1;
  }

  /* ==================================================== */
  /* research-links */
  /* ==================================================== */

  .research-link-grid {
    grid-template-columns: 1fr;
  }

  .research-link-card__footer {
    padding: 14px 16px;
  }

  .research-link-card__title {
    font-size: 24px;
  }
}

/* ========================================================================== */
/* @media：SP */
/* ========================================================================== */

@media (max-width: 767px) {

  .research-circle-right-img {
    position: absolute;
    right: -26px;
    top: 280px;
    width: 107px;
    height: 107px;
  }

  .research-top .page-inner {
    margin: auto;
    padding: 40px 24px;
  }

  /* ==================================================== */
  /* research-lead */
  /* ==================================================== */

  .research-lead {
    position: relative;
    overflow: visible;
  }

  .research-lead__bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 5;
  }

  .research-lead__bg-circle {
    top: 102%;
    width: 64px;
    height: 64px;
  }

  .research-lead__headline {
    text-align: left;
    font-size: 20px;
    font-weight: 600;
    line-height: 32px;
    /* 160% */
    letter-spacing: 0.8px;
    margin-right: -24px;
  }

  .research-lead__text {
    text-align: left;
    font-size: 14px;
  }

  /* ==================================================== */
  /* research-area */
  /* ==================================================== */

  .research-area {
    position: relative;
    z-index: 1;
  }

  .research-area__title {
    font-size: 32px;
    margin-top: 24px;
  }

  .research-area-bottom-title {
    font-size: 18px;
  }

  .research-area-bottom-detail {
    font-size: 14px;
    line-height: 30px;
    /* 214.286% */
    letter-spacing: 0.56px;
  }

  .research-area-bottom-top {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  .research-area-bottom-top-box {
    display: flex;
    align-items: center;
    flex: 1;
    min-width: 0;
  }

  .research-area-bottom-title {
    flex: 1;
    min-width: 0;
    white-space: normal;
    overflow-wrap: break-word;
    word-break: keep-all;
  }

  /* ==================================================== */
  /* research-oi-cards */
  /* ==================================================== */

  .research-oi-card {
    padding: 20px 20px 52px 20px;
  }

  .research-oi-media {
    gap: 16px
  }

  .research-oi-media__col--up {
    transform: translateY(-16px);
    gap: 16px
  }

  .research-oi-media__col--down {
    transform: translateY(20px);
    gap: 16px
  }

  .research-oi-more__icon {
    width: 40px;
    height: 40px;
  }

  .research-oi-lead {
    margin: 0 0 16px;
    line-height: 30px;
    letter-spacing: 0.64px;
    color: var(--title-text-dark-blue);
  }

  /* ==================================================== */
  /* research-links */
  /* ==================================================== */

  .research-link-card__btn {
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 450px) {
  .br-hide-450 {
    display: none;
  }
}

@media (max-width: 425px) {
  .br-hide-425,
  .pc-br {
    display: none;
  }
}

@media print {
  .research-area {
    margin-top: 200px;
  }

  .research-open-innovation {
    margin-top: 400px;
  }

  .research-oi-cards {
    gap: 120px;
  }
}