/* Fallback layout for old iPad / iOS Safari when utility CSS is incomplete. */
html {
  -webkit-text-size-adjust: 100%;
}
img, video {
  max-width: 100%;
  height: auto;
}
.book-cover {
  width: 120px;
  height: 160px;
  max-width: 100%;
  box-sizing: border-box;
}
.book-card,
.book-card-wrapper {
  display: inline-block;
  vertical-align: top;
  max-width: 100%;
}
header.sticky > div {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  align-items: center;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
  gap: 0.75rem;
}
header.sticky nav[aria-label="主导航"] {
  display: -webkit-box;
  display: -webkit-flex;
  display: flex;
  -webkit-flex-wrap: wrap;
  flex-wrap: wrap;
  -webkit-box-flex: 1;
  -webkit-flex: 1 1 auto;
  flex: 1 1 auto;
  min-width: 0;
}
.textbook-cover-frame {
  max-width: 100%;
}
.textbook-cover-image {
  max-width: 100%;
  height: auto;
}

@media (max-width: 1024px) {
  body {
    overflow-x: hidden;
  }
  header.sticky nav[aria-label="主导航"] {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .mx-auto {
    padding-left: 16px;
    padding-right: 16px;
  }
}

@media (max-width: 768px) {
  .book-cover {
    width: 96px;
    height: 128px;
  }
}