body {
  background: #F5F5F5;
}
.banner-wrap {
  position: relative;
}
.banner-wrap .mask {
  position: absolute;
  top: 50%;
  left: 10%;
  transform: translateY(-50%);
}
.banner-wrap .mask > h2 {
  font-size: 72px;
  font-family: Impact;
  font-weight: 400;
  color: #053991;
  opacity: 0.6;
  margin: 0 0 5px;
}
.banner-wrap .mask > small {
  font-size: 68px;
  font-family: Source Han Sans SC;
  font-weight: bold;
  color: #003592;
}
.banner-wrap .mask > p {
  font-size: 24px;
  font-family: Microsoft YaHei;
  font-weight: bold;
  color: #003592;
  margin: 117px 0 46px;
  position: relative;
}
.banner-wrap .mask > p::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -23px;
  width: 60px;
  height: 2px;
  background: #003592;
}
.banner-wrap .mask > span {
  font-size: 16px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #4D4D4D;
}
.classroom-wrap {
  background: #fff;
  overflow: hidden;
  transform: translateY(-4px);
  padding-top: 20px;
}
.classroom-wrap header {
  text-align: center;
  margin-top: 30px;
}
.classroom-wrap h2 {
  font-size: 44px;
  font-family: Source Han Sans SC;
  font-weight: bold;
  color: #053991;
  line-height: 1;
  margin: 0;
  transform: translateY(-20px);
}
.classroom-wrap small {
  font-size: 40px;
  font-family: Impact;
  font-weight: 400;
  color: #053991;
  line-height: 0;
  opacity: 0.1;
}
.classroom-wrap .swiper {
  padding: 10px 10px 80px;
}
.classroom-wrap .controller {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  height: 50px;
  display: flex;
  align-items: center;
  width: 100%;
}
.classroom-wrap .swiper-pagination {
  position: relative;
  flex: 1;
  margin: 0 40px;
}
.classroom-wrap .swiper-button-next,
.classroom-wrap .swiper-button-prev {
  display: none;
  position: relative;
  transform: unset;
  top: unset;
  bottom: 0;
  width: 31px;
  height: 31px;
  border: 1px solid #053991;
  border-radius: 50%;
  color: #053991;
}
.classroom-wrap .swiper-button-next::after,
.classroom-wrap .swiper-button-prev::after {
  font-size: 15px;
}
.classroom-wrap .swiper-slide {
}
.classroom-wrap .swiper-slide .c {
  padding: 15px;
  box-sizing: border-box;
}
.classroom-wrap .swiper-slide .wrap {
  cursor: pointer;
  box-shadow: 2px 2px 10px 0 rgba(77, 77, 77, 0.2);
  border-radius: 15px;
  overflow: hidden;

}
.classroom-wrap.video .cover {
  height: unset !important;
}
.classroom-wrap.video .col-lg-2 {
  width: 20%;
}
.classroom-wrap.video .swiper-slide .wrap {
  box-shadow: unset !important;
  position: relative;
  perspective: 1000px;
  transform-style: preserve-3d;
  overflow: unset;
}
.classroom-wrap.video .swiper-slide .wrap:hover img:first-child {
  transform: rotateY(180deg);
}
.classroom-wrap.video .swiper-slide .wrap:hover img:last-child {
  transform: rotateY(0);
}
.classroom-wrap.video .swiper-slide img {
  max-width: 100%;
}
.classroom-wrap.video .swiper-slide img:first-child {
  position: relative;
  z-index: 1;
  transition: all 0.6s ease-in-out 0s;
  backface-visibility: hidden;
}
.classroom-wrap.video .swiper-slide img:last-child {
  position: absolute;
  top: 0;
  left: 0;
  transition: all 0.6s ease-in-out 0s;
  transform: rotateY(-180deg);
}


/*@media screen and (max-width: 640px) {*/
/*  .classroom-wrap .controller {*/
/*    bottom: -20px;*/
/*  }*/
/*}*/


.classroom-wrap .cover {
  position: relative;
  border-top-left-radius: 15px;
  border-top-right-radius: 15px;
  overflow: hidden;
  background: #fff;
  height: 187px;
}
.classroom-wrap .cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.classroom-wrap .cover .play {
  position: absolute;
  bottom: 20px;
  left: 20px;
  opacity: 1;
  transition: all .3s ease;
}
.classroom-wrap .cover .play > img {
  width: 50%;
  height: 50%;
}
.classroom-wrap .desc {
  padding: 24px;
  background: #FFFFFF;
  border-radius: 0px 0px 10px 10px;
}
.classroom-wrap .desc p {
  font-size: 16px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #4D4D4D;
  margin: 0 0 26px;
  height: 50px;
}
.classroom-wrap .desc .bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.classroom-wrap .desc .left {
  font-size: 14px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #999999;
  display: flex;
  align-items: center;
}
.classroom-wrap .desc img {
  width: 25px;
  margin-right: 5px;
}
.classroom-wrap .desc .right {
  font-size: 14px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #999999;
}

.classroom-wrap.time {
  background: #F5F5F5;
  padding-top: 110px;
}
.classroom-wrap.time .col {
  box-sizing: border-box;
  padding: 15px;
}
.classroom-wrap.time .cover::before {
  display: none;
}
.classroom-wrap.time .cover img {
  transition: all .3s;
}
.classroom-wrap.time .cover:hover img {
  transform: scale(1.1);
}
.classroom-wrap.time .play {
  display: none;
}


@media screen and (max-width: 720px) {
  .banner-wrap {
    position: relative;
  }
  .banner-wrap .mask {
    position: absolute;
    top: 0;
    left: 10%;
    transform: translateY(0);
  }
  .banner-wrap .mask > h2 {
    font-size: 16px;
    font-family: Impact;
    font-weight: 400;
    color: #053991;
    opacity: 0.6;
    margin: 30px 0 5px;
  }
  .banner-wrap .mask > small {
    font-size: 24px;
    font-family: Source Han Sans SC;
    font-weight: bold;
    color: #003592;
  }
  .banner-wrap .mask > p {
    font-size: 14px;
    font-family: Microsoft YaHei;
    font-weight: bold;
    color: #003592;
    margin: 24px 0 24px;
    position: relative;
  }
  .banner-wrap .mask > p::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -12px;
    width: 60px;
    height: 2px;
    background: #003592;
  }
  .banner-wrap .mask > span {
    font-size: 12px;
    font-family: Microsoft YaHei;
    font-weight: 400;
    color: #4D4D4D;
  }


  .classroom-wrap.time {
    padding: 30px 0;
  }
  .classroom-wrap .swiper {
    padding: unset;
  }
  .classroom-wrap .swiper-slide {
    cursor: pointer;
    /*box-shadow: 2px 2px 10px 0 rgba(77, 77, 77, 0.2);*/
    border-radius: 15px;
    overflow: hidden;
    padding: 0 0 60px;
  }
  .classroom-wrap.video .swiper-slide .wrap img {
    width: 100%;
  }
  .classroom-wrap .swiper-slide .wrap {
    box-shadow: unset;
  }
}