/* below 1376px */
@media (max-width: 86em) {
}

/* below 1200px */
@media (max-width: 75em) {
  html {
    font-size: 56.25%;
  }
}

/* below 1104px */
@media (max-width: 69em) {
  .chap-06-pic-img {
    width: 100rem;
  }
  .book-grid {
    max-width: 70rem;
    grid-template-columns: repeat(2, 1fr);
    row-gap: 3.2rem;
    margin: 0 auto;
  }

  .content-box {
    max-width: 80rem;
    margin: 0 auto;
  }
  .bn-grid-2 {
    max-width: 80rem;
    grid-template-columns: 1fr;
    row-gap: 6.4rem;
    margin: 0 auto;
    margin-top: 4.6rem;
  }
  .bn-long-none {
    display: none;
  }
  .bn-grid-4 {
    grid-template-columns: repeat(2, 1fr);
    gap: 6.4rem;
    row-gap: 6.4rem;
  }
  .book-box {
    justify-self: center;
  }
  .bn-img {
    max-width: 100%;
  }
}

/* below 944px */
@media (max-width: 59em) {
  html {
    font-size: 50%;
  }
  .section-chap-02,
  .section-chap-03,
  .section-chap-04,
  .section-chap-05 {
    padding-top: 30rem;
  }
  .chap-02-pic {
    left: 0;
  }
  .chap-01-pic-img,
  .chap-02-pic-img,
  .chap-04-pic-img {
    width: 77rem;
  }
  .chap-06-pic-img {
    width: 90rem;
  }
  .chap-title-01-img {
    height: 24rem;
  }
  .chap-title-02-img {
    height: 33rem;
  }
  .chap-title-06-img {
    width: 14rem;
    margin-bottom: 3.2rem;
  }
}

/* below 752px */
@media (max-width: 47em) {
  .main-container {
    padding: 0 3.2rem;
  }
  .section-hero {
    background-image: url(images/bg-hero-sm.jpg);
    padding-top: 40rem;
  }
  .hero-title-img {
    width: 44rem;
    margin-bottom: 8rem;
  }
  .hero-promotion-absolute {
    top: 66rem;
  }
  .hero-t-box {
    margin-top: 36rem;
    margin-left: 2rem;
    margin-right: 2rem;
  }
  .hero-intro-box {
    margin-left: 2rem;
    margin-right: 2rem;
    padding: 6.4rem 2.4rem;
  }
  .section-chap-02,
  .section-chap-03,
  .section-chap-04,
  .section-chap-05 {
    padding-top: 10rem;
  }
  .chap-01-pic,
  .chap-02-pic,
  .chap-04-pic {
    left: 50%;
    transform: translateX(-50%);
  }
  .chap-01-pic-img,
  .chap-02-pic-img,
  .chap-04-pic-img,
  .chap-06-pic-img {
    width: 70rem;
  }
  .chap-title-flex-end {
    justify-content: center;
  }
  .chap-title-flex-end-07 {
    justify-content: end;
    margin-right: 0;
  }
  .section-chap-06,
  .section-chap-07,
  .section-chap-08 {
    padding-top: 8rem;
  }
  .chap-title-06 {
    display: none;
  }
  .chap-title-06-sm {
    display: block;
  }
  .chap-title-06-img {
    width: auto;
    height: 8rem;
  }
  .content-box {
    padding: 4.6rem 0;
  }
  .book-grid {
    row-gap: 2.4rem;
  }
  .book-tag {
    left: 0rem;
  }
  .book-set {
    max-width: 15rem;
    justify-self: center;
  }
  .book-box {
    width: 22rem;
    padding: 0;
  }
  .book-img {
    height: 24rem;
  }
  .good-img {
    height: 20rem;
  }
  .bn-grid-2 {
    margin: 2rem;
    row-gap: 3.2rem;
  }
  .bn-grid-4 {
    gap: 3.2rem;
    row-gap: 3.2rem;
    margin-top: 4.6rem;
  }
  .content-box-padding {
    padding: 4.6rem 2.4rem;
  }
  .activity {
    padding-top: 4.6rem;
  }
  .side-bar {
    display: none;
  }
  .w3-button,
  .w3-xxlarge {
    display: block;
  }
}

/* below 544px */
@media (max-width: 34em) {
  .main-container {
    padding: 0 2rem;
  }
  .section-hero {
    padding-bottom: 6.4rem;
  }
  .hero-promotion-absolute {
    right: 5%;
    left: 5%;
  }
  .hero-t-box {
    border: solid 0.8rem #fc546a;
    padding: 2.4rem;
  }
  .hero-t-text-list {
    margin-left: 1rem;
  }
  .section-intro {
    padding: 9rem 0;
  }
  .chap-01-pic-img,
  .chap-02-pic-img,
  .chap-04-pic-img,
  .chap-06-pic-img {
    width: 40rem;
  }
  .chap-title-01-img {
    height: auto;
    width: 100%;
  }
  .chap-title-02-img {
    height: auto;
    width: 90%;
  }
  .chap-title-descrip {
    margin-top: 6.4rem;
    margin-bottom: 6.4rem;
  }
  .activity {
    padding-top: 4.6rem;
  }
}

/* below 440px */
@media (max-width: 27.5em) {
  .hero-promotion-date-absolute2 {
    top: 12rem;
  }
  .hero-promotion-date-absolute3 {
    top: 25rem;
  }
  .hero-t-box {
    margin-top: 42rem;
  }
}