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

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

.research-lead {
  position: relative;
  overflow: hidden;
  margin-top: 80px;
  background: #EDF0F5;
}

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

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

.research-lead__text {
  max-width: 1200px;
  margin: 0 auto;
  line-height: 30px;
  letter-spacing: 0.64px;
  color: #000;
  text-align: left;
}

/* ========================================================================== */
/* 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(--sky-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, padding 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;
  align-items: center;
  gap: 12px;
}

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

.research-area-bottom-title {
  color: var(--sky-blue);
  font-size: 24px;
  font-weight: var(--title-weight);
  line-height: 32px;
  letter-spacing: 0.96px;
  white-space: normal;
  text-align: left;
  flex: 1;
  min-width: 0;
  word-break: break-word;
}

.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-accordion-icon {
  flex-shrink: 0;
  margin-left: 12px;
}

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

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

@media (max-width: 1023px) {
  .research-circle-right-img {
    top: 180px;
    width: 160px;
    height: 160px;
  }

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

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

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

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

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

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

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

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

@media (max-width: 767px) {
  .research-circle-right-img {
    right: -26px;
    top: 280px;
    width: 107px;
    height: 107px;
  }

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

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

  .research-lead {
    overflow: visible;
  }

  .research-lead__headline {
    font-size: 20px;
    line-height: 32px;
  }

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

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

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

  .research-area-bottom-title {
    font-size: 18px;
    /* white-space: normal; */
  }

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

  .research-area-bottom-box.is-open .research-area-bottom-top {
    padding: 24px 16px 16px 16px;
  }

  .research-area-bottom-detail {
    font-size: 14px;
    line-height: 30px;
    letter-spacing: 0.56px;
    padding: 8px 16px 24px 16px;
  }
}

@media print {
  .research-area__head {
    margin-top: 80px;
  }
}