.mark{
    background:linear-gradient(transparent 60%, #fff500 60%);
}
main picture img  {
    display: block;
    width: 100%;
    height: auto;
}
img {
    vertical-align: bottom;
    border: none;
    max-width: 100%;
}
.gaku_back_b {
  background-image: url("../img/gaku_back_b.png");
  background-size: 100% auto;
  background-repeat: no-repeat;
}
@media (max-width: 768px) {
  .gaku_back_b{
    background-image: url("../img/gaku_back_bm.jpg");
    background-size: 100% auto;
    background-repeat: no-repeat;
    background-position: 0 40px;
  } 
}


#splash1 {
  width: 100vw;
  height: 100vh;
  position: fixed;
  z-index: 999;
  transition: opacity 1s;
  background-color: #fff;
  overflow: hidden;
}
#splash1 picture {
  display: block;
  width: 100%;
  height: 100%;
  background-image: url(../img/about/splash1.jpg);
  background-size: cover;
  background-position: top;
  transition: opacity 0.5s;
  opacity: 0;
}

@media (max-width: 768px) {
  #splash1 picture {
    background-image: url(../img/about/splash1_m.jpg);
  }
}

.noScroll {
  overflow: hidden;
}


/* トップ */


.section_about_top {
  width: 100%;
  position: relative;
}

.about_top_img_inner {
  width: 100%;
}

.about_top_copy_inner {
  width: 50%;
  max-width: 530px;
  position: absolute;
  top: 11%;
  left: 12%;
}

h1 img {
  display: block;
  width: 55%;
  height: auto;
}

.about_top_copy_title {
  color: #032bf7;
  font-size: 32px; /* IE対策 */
  font-size: clamp(16px, 2.9vw, 34px);
  font-weight: 900;
  font-family: 'Noto Sans JP', sans-serif;
  line-height: 1.6;
  margin-top: 3%;
  text-align: left;
}

.about_top_copy_head_wrap {
  margin-top: 3%;
  width: 100%;
  display: flex;
}

.about_top_copy_head_box {
  position: relative;
}
.about_top_copy_head_box.sp{
  display: none;
}

.about_top_copy_head_bg {
  display: block;
  width: 70%;
  height: auto;
  width: 300px;
}

.about_top_copy_head {
  color: #fff;
  font-size: 26px; /* IE対策 */
  font-size: clamp(13px, 2.2vw, 28px);
  font-weight: 900;
  font-family: 'Noto Sans JP', sans-serif;
  text-align: center;
  width: 100%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.about_top_copy_head_r {
  font-weight: 400;
}

@media (max-width: 768px) {
  .about_top_copy_head_bg {
    display: block;
    height: auto;
    width: 130px;
  }
}

/* 見出し */

#cycle {
    width: 100%;
    margin: 0 auto;
    font-size: 1.6rem;
    font-weight: 900;
    padding: 100px 0 0 0;
  }
#cycle .cycle_wrap {
  display: flex;
  justify-content: left;
  align-items: left;
}
#cycle .text h2 {
    display: inline-block;
    font-size: 40px;
    font-size: clamp(20px, 3.7vw, 44px);
    line-height: 1.6;
    letter-spacing: 0.1em;
    text-align: left;
}
#cycle .text_message {
  width: 55%;
}
#cycle .text_message p {
    padding-top: 50px;
    font-size: 20px;
    font-size: clamp(14px,1.8vw,22px);
    line-height: 1.8;
    font-weight: bold;
}
#cycle .text_message_i {
    margin-top: -5%;
    width: 45%;
}

@media (max-width: 768px) {
  #cycle {
    text-align: center;
  }
  #cycle .cycle .cycle_wrap
  .text_message_i {
    margin-left: auto;
    margin-right: auto;
    margin-top: 0%;
    width: 100%;
  }
  #cycle .text {
    margin-top: 15%;
  }
  #cycle .text h2 {
    font-size: 20px;
    font-size: clamp(20px,5.9vw,44px);
    text-align: left;
  }
  #cycle .cycle_wrap {
    flex-direction: column-reverse;
    margin:50px 0 50px 0;
    width: 93%;
  }
  #cycle .text_message {
    text-align: left;
    display: inline-block;
    width: 100%;
  }
  #cycle .text_message p {
    font-size: clamp(16px,4.5vw,33px);
    line-height: 1.8;
  }
}


/* ３つの説明文 */

#explanation {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-top: 6%;
    width: 100%;
}
.explanation_lesson,.explanation_review,.explanation_school{
    border: 2px solid var(--e-blue);
    border-radius: 30px;
    padding: 14px;
    margin: 10px;
    width: 30%;
    text-align: center;
}
.explanation_a{
    font-size: 1.9rem;
    font-weight: 800;
    line-height: 1.7;
    position: relative;
    display: inline-block;
    padding: 0 1rem;
    cursor: pointer;
    text-align: center;
    vertical-align: middle;
    color: #fff;
    background-color: var(--e-blue);
    border-radius: 100vh;
}
.explanation_b {
    font-size: 4rem;
    font-weight: 900;
    color: var(--g-yellow);
    text-shadow: 0 var(--g-yellow);
    -webkit-text-stroke: 2px var(--e-blue);
    text-stroke: 2px var(--e-blue);
}
.explanation_d {
    font-size: 4rem;
    font-weight: 900;
    color: var(--g-yellow);
    text-shadow: 0 var(--g-yellow);
    -webkit-text-stroke: 2px var(--e-blue);
    text-stroke: 2px var(--e-blue);
    transform: scale(0.9, 1);
    transform-origin: top left;
    width: 110%;
}
.explanation_e {
    font-size: 3rem;
    font-weight: 700;
    color: var(--g-yellow);
    text-shadow: 0 var(--g-yellow);
    -webkit-text-stroke: 2px var(--e-blue);
    text-stroke: 2px var(--e-blue);
}
.explanation_c {
    color: var(--e-blue);
    font-size: 1.6rem;
    font-weight: 900;
}
.explanation_f {
    padding: 10px 5px 10px 5px;

}
.explanation_f p {
    text-align: left;
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    line-height: 1.4;
}

@media (max-width: 768px) {
  #explanation {
    flex-direction: column;
    margin-bottom: 50px;
  }  
  .explanation_lesson,.explanation_review,.explanation_school {
    box-sizing: border-box;
    width: 100%;
    margin-bottom: 50px;
    margin-left:0;
    margin-right: 0;
  }
}

/*　よくあるご質問　*/

#question {
    font-size: clamp(13px, 2.4vw, 28px);
    color: var(--e-pink);
    font-weight: 900;
    padding-top: 100px;
  }
.question h2 {
    color: #fff;
    font-size: 25px;
    font-size: clamp(12px, 2.2vw, 27px);
    font-weight: bold;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.question img {
    height: 3rem;
    margin: max(50px, 10vw) auto;
}
.pinksection {
  position: relative;
  font-size: 1.8rem;
  color: white;
}

.qText {
  margin: 0 auto 300px auto;
}
.qTextQ {
  border: 2px solid;
  border-radius: 30px;
  padding: 20px 40px;
  width: 60%;
  margin: 10px auto;
}
.qTextQ_Q {
  font-size: 1rem;
  font-weight: 600;
}
.qTextQ_A {
  text-align: left;
  font-size: 0.9rem;
  font-weight: 520;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: #000;
}

@media (max-width: 768px) {
  #question {
    flex-direction: column;
    margin-bottom: 50px;
  } 
  .pinksection img{
    height: 6vw;
  }
  .pinksection h2{
    font-size: 2.5vw;
  }
  .question,.wText,.wText,.qTextQ {
    box-sizing: border-box;
    width: 100%;
    margin-bottom: 50px;
    margin-left:0;
    margin-right: 0;
  }
}




/*　まんが　*/

.slide-wrap {
    display: flex;
    margin: 0 auto;
    max-width: 1024px;
    width: 100%;
  }
  .slide-box {
    height: auto;
    margin: .5%;
    width: 24%;
  }
  .slide-box a {
    color: #222;
    display: block;
    text-decoration: none;
  }
  .slide-box img {
    display: block;
    height: auto;
    width: 100%;
  }
  .slide-box p {
    font-weight: bold;
    padding: 10px;
    margin:.5rem auto;
  }
  @media screen and (max-width: 768px) {
  /* スマホサイズでスライダー表示 */
    .slide-wrap {
      overflow-x: scroll;
    }
    .slide-box {
      flex: 0 0 70%;
      margin: auto 1% auto auto;
    }
  }

.mangaViewer {
  height: 90%;
  width: auto;
  box-sizing: border-box;
  padding: 15px;
}

.mangaViewer .closeButton {
  width: 20px;
  height: 20px;
}

.mangaViewer .closeButton::before {
  font-size: 22px;
}

.mangaViewer picture {
  height: 100%;
}

.mangaViewer img {
  display: none;
  height: 100%;
}


.mangaViewer img.showManga {
  display: block;
}

@media (max-width: 1024px) {
  .mangaViewer picture {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
  }
  .mangaViewer img {
    height: auto;
    width: auto;
    max-width: 100%;
    max-height: 100%;
  }
}

@media (max-width: 768px) {
  .mangaViewer {
    height: 90%;
    width: 90%;
  }
}