body {
  background: rgba(245, 245, 245, 1);
}
.introduce-wrap {
  padding: 55px 0;
  z-index: 10;
}
.introduce-wrap .container {
  display: flex;
}
.introduce-wrap .container aside {
  width: 300px;
}
.introduce-wrap .container aside.fixed ul {
  position: fixed;
  width: 300px;
  top: 120px;
  z-index: 5;
}
.introduce-wrap .container aside a {
  display: flex;
  align-items: center;
  height: 80px;
  padding: 0 30px;
  background: #fff;
  transition: background .3s ease, color .3s ease;
  line-height: 1;
  color: #333;
}
.introduce-wrap .container aside a span {
  display: block;
  margin-left: 15px;
  font-size: 18px;
}
.introduce-wrap .container aside li.active a,
.introduce-wrap .container aside a:hover {
  background: #153A88;
  color: #fff;
}
.introduce-wrap .container aside a .icon {
  width: 25px;
  height: 25px;
  position: relative;
}
.introduce-wrap .container aside a .icon img {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: opacity .3s ease;
}
.introduce-wrap .container aside a .icon img:last-child {
  opacity: 1;
}
.introduce-wrap .container aside li.active a .icon img:first-child,
.introduce-wrap .container aside a:hover .icon img:first-child {
  opacity: 1;
}
.introduce-wrap .container aside li.active a .icon img:last-child,
.introduce-wrap .container aside a:hover .icon img:last-child {
  opacity: 0;
}
.introduce-wrap .container section {
  flex: 1;
  margin-left: 20px;
  background: #fff;
  padding: 30px;
  background: #fff;
}
.introduce-wrap .container section.a126 {
  background: #fff url("/images/tissue_bg_1.png") no-repeat center;
  background-size: cover;
}
.introduce-wrap .container section h2 {
  font-size: 24px;
  font-weight: 400;
  color: #000000;
  margin: 0 0 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid #ddd;
}
.introduce-wrap .container section .rich-text {
  color: #666;
  line-height: 1.8;
}
.introduce-wrap .container section .rich-text img {
  max-width: 100%;
  object-fit: contain;
}
.introduce-wrap .container section .rich-text p {
  margin: unset;
}
.introduce-wrap .container section .rich-text p + p {
  margin-top: 15px;
}

.page-control-wrap {
  display: flex;
  justify-content: center;
}
.page-control-wrap li + li {
  margin-left: 15px;
}
.page-control-wrap a {
  display: block;
  width: 150px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  border: 1px solid #999;
  color: #666;
  border-radius: 5px;
  transition: background .3s ease, color .3s ease;
}
.page-control-wrap a:hover {
  background: #153A88;
  color: #fff;
}

@media screen and (max-width: 640px) {
  .introduce-wrap {
    padding: 30px 0;
  }
  .introduce-wrap .container {
    display: block;
  }
  .introduce-wrap .container section {
    margin: 20px 0 0;
    padding: 20px;
  }
  .introduce-wrap .container aside {
    width: 100%;
  }
  .introduce-wrap .container aside a {
    height: 60px;
  }
  .introduce-wrap .container aside a span {
    font-size: 15px;
  }
  .introduce-wrap .container aside a .icon {
    width: 20px;
    height: 20px;
  }
  .introduce-wrap .container section .rich-text {
    font-size: 14px;
    text-indent: 28px;
  }
  .introduce-wrap .container section .rich-text h3 {
    margin: unset !important;
  }
}