/* ==========================================================================
   Common concept Section
   ========================================================================== */
.concept {
  margin-top: 102px !important;
  padding: 94px 0 154px;
  background-color: #f6f6f6;
}
.concept_inner {
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  width: 960px;
  margin: 0 auto;
  padding: 0 122px;
}
.concept_section {
  margin-top: 48px;
}
.concept_section:first-child {
  margin-top: 0;
}
.concept_title {
  text-align: center;
}
.concept_lower-title {
  font-size: 1.7rem;
  line-height: 1.65;
  text-align: left;
  font-weight: bold;
}
.concept_text {
  font-size: 1.7rem;
  line-height: 1.65;
  text-align: left;
}
.concept_title + .concept_text {
  margin-top: 47px;
}
.concept_body {
  position: relative;
}
.concept_body_inner {
  margin-top: 49px;
}
.concept_trigger {
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: 54px !important;
}
.concept_trigger > a {
  white-space: nowrap;
  text-indent: 110%;
  overflow: hidden;
  position: relative;
  display: block;
  width: 145px;
  height: 45px;
  background: url(/library/kyousai/kokumin/common/img/concept_img04.png) no-repeat center center / 100% 100%;
}
.concept_trigger > a::before,
.concept_trigger > a::after {
  content: '';
  display: block;
  position: absolute;
  top: 0;
  right: 7px;
  bottom: 0;
  width: 31px;
  height: 0;
  margin: auto 0;
  border-top: 3px solid #fff;
  -webkit-transition: -webkit-transform .3s ease;
  transition: -webkit-transform .3s ease;
  transition: transform .3s ease;
  transition: transform .3s ease, -webkit-transform .3s ease;
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
}
.concept_trigger > a::after {
  -webkit-transform: rotate(90deg);
      -ms-transform: rotate(90deg);
          transform: rotate(90deg);
}
.is-expanded .concept_trigger > a::after {
  -webkit-transform: rotate(360deg);
      -ms-transform: rotate(360deg);
          transform: rotate(360deg);
}
.concept_trigger > a:hover::before,
.concept_trigger > a:active::before {
  -webkit-transform: scale(1.1);
      -ms-transform: scale(1.1);
          transform: scale(1.1);
}
.concept_trigger > a:hover::after,
.concept_trigger > a:active::after {
  -webkit-transform: rotate(90deg) scale(1.1);
      -ms-transform: rotate(90deg) scale(1.1);
          transform: rotate(90deg) scale(1.1);
}
.is-expanded .concept_trigger > a:hover::after,
.is-expanded .concept_trigger > a:active::after {
  -webkit-transform: rotate(360deg) scale(1.1);
      -ms-transform: rotate(360deg) scale(1.1);
          transform: rotate(360deg) scale(1.1);
}