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 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;
}
.introduce-wrap .list-wrap a {
  display: flex;
}
.introduce-wrap .list-wrap a + a {
  margin-top: 40px;
}
.introduce-wrap .list-wrap .desc {
  flex: 1;
}
.introduce-wrap .list-wrap a:hover .desc h2 {
  color: #153A88;
}
.introduce-wrap .list-wrap .desc h2 {
  font-size: 18px;
  font-weight: 400;
  line-height: 1.4;
  margin: unset;
}
.introduce-wrap .list-wrap .desc p {
  color: #666;
  line-height: 1.6;
  margin: 15px 0 0;
}
.introduce-wrap .list-wrap .cover {
  width: 330px;
  height: 200px;
  margin-left: 20px;
  overflow: hidden;
}
.introduce-wrap .list-wrap .cover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s ease;
}
.introduce-wrap .list-wrap a:hover .cover img {
  transform: scale(1.1);
}
.introduce-wrap .list-wrap .desc small {
  display: block;
  margin-top: 15px;
  color: #999;
}
@media screen and (max-width: 640px) {
  .introduce-wrap .container {
    display: block;
  }
  .introduce-wrap .container aside ul {
    display: flex;
    justify-content: center;
  }
  .introduce-wrap .container aside a {
    padding: 0 10px;
    height: 40px;
    line-height: 40px;
    font-size: 14px;
  }
  .introduce-wrap .container section {
    margin: unset;
    margin-top: 30px;
    padding: 20px;
  }
  .introduce-wrap .list-wrap a {
    flex-direction: column-reverse;
    padding-bottom: 20px;
    border-bottom: 1px solid #ddd;
  }
  .introduce-wrap .list-wrap a + a {
    margin-top: 20px;
  }
  .introduce-wrap .list-wrap .cover {
    margin: 0 0 15px;
    width: 100%;
    height: 160px;
  }
  .introduce-wrap .list-wrap .desc h2 {
    font-size: 16px;
  }
  .introduce-wrap .list-wrap .desc p {
    font-size: 14px;
    color: #999;
    margin-top: 10px;
  }
  .introduce-wrap .list-wrap .desc small {
    margin-top: 10px;
  }
}