.all {
  padding: 4.5% 0;
}

.intro .flx {
  margin-top: 60px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
}
.intro .l {
  width: 50%;
}
.intro .r {
  width: 43%;
  color: #888888;
  line-height: 1.875;
}
.intro .img {
  position: relative;
  height: 0;
  padding-bottom: 62.5%;
  overflow: hidden;
  display: block;
  -webkit-transition: 0.5s;
  transition: 0.5s;
}
.intro .img img {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  -o-object-fit: cover;
     object-fit: cover;
}
.intro .img:hover img {
  -webkit-transform: scale(1.05);
      -ms-transform: scale(1.05);
          transform: scale(1.05);
}

.construction {
  margin-top: 5.9%;
}
.construction .sw {
  margin-top: 60px;
  position: relative;
}
.construction .prev {
  left: -55px;
}
.construction .next {
  right: -55px;
}
.construction .img {
  position: relative;
  height: 0;
  padding-bottom: 63%;
  overflow: hidden;
  display: block;
  -webkit-transition: 0.5s;
  transition: 0.5s;
}
.construction .img img {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  -o-object-fit: cover;
     object-fit: cover;
}
.construction .img:hover img {
  -webkit-transform: scale(1.05);
      -ms-transform: scale(1.05);
          transform: scale(1.05);
}
.construction .tit {
  line-height: 1;
  margin-top: 30px;
}
.construction .tit a {
  color: #222222;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}
.construction .tit a:hover {
  color: #F00000;
}
.construction .des {
  margin-top: 20px;
  line-height: 1.875;
  color: #888888;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.case {
  margin-top: 5.9%;
}
.case .sw {
  margin-top: 60px;
  position: relative;
}
.case .prev {
  left: -55px;
}
.case .next {
  right: -55px;
}
.case .img {
  position: relative;
  height: 0;
  padding-bottom: 63%;
  overflow: hidden;
  display: block;
  -webkit-transition: 0.5s;
  transition: 0.5s;
}
.case .img img {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  -o-object-fit: cover;
     object-fit: cover;
}
.case .img:hover img {
  -webkit-transform: scale(1.05);
      -ms-transform: scale(1.05);
          transform: scale(1.05);
}
.case .tit {
  line-height: 1;
  margin-top: 30px;
}
.case .tit a {
  color: #222222;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}
.case .tit a:hover {
  color: #F00000;
}
.case .des {
  margin-top: 20px;
  line-height: 1.875;
  color: #888888;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.publicity {
  padding-top: 5.9%;
}
.publicity .vio {
    cursor: pointer;
  margin-top: 60px;
  overflow: hidden;
  position: relative;
}
.publicity .vio_bg {
  position: absolute;
  z-index: 2;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}
.publicity .vio_bg img {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
}
.publicity .vio_bg::after {
  content: "";
  position: absolute;
  z-index: 2;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
}
.publicity .play {
  cursor: pointer;
  position: absolute;
  z-index: 3;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
      -ms-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  color: #fff;
}
.publicity .play div {
  line-height: 1;
  margin-top: 20px;
}
.publicity video {
  width: 100%;
  display: block;
}

.player {
  margin-top: 5.9%;
}
.player .player_box {
  margin-top: 60px;
  position: relative;
}

.player .img {
  position: relative;
  height: 0;
  padding-bottom: 50%;
  overflow: hidden;
  display: block;
  -webkit-transition: 0.5s;
  transition: 0.5s;
}
.player .img img {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  -o-object-fit: cover;
     object-fit: cover;
}
.player .sw_clk {
  position: absolute;
  top: 50%;
  -webkit-transform: translateY(-50%);
      -ms-transform: translateY(-50%);
          transform: translateY(-50%);
  z-index: 2;
}
.player .prev {
  left: -55px;
}
.player .next {
  right: -55px;
}

.teach {
  margin-top: 5.9%;
}
.teach .sw {
  margin-top: 60px;
  position: relative;
}
.teach .prev {
  left: -55px;
}
.teach .next {
  right: -55px;
}
.teach .img {
  position: relative;
  height: 0;
  padding-bottom: 63%;
  overflow: hidden;
  display: block;
  -webkit-transition: 0.5s;
  transition: 0.5s;
}
.teach .img img {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  -o-object-fit: cover;
     object-fit: cover;
}
.teach .img:hover img {
  -webkit-transform: scale(1.05);
      -ms-transform: scale(1.05);
          transform: scale(1.05);
}
.teach .tit {
  line-height: 1;
  margin-top: 28px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: justify;
      -ms-flex-pack: justify;
          justify-content: space-between;
}
.teach .des {
  padding-top: 22px;
  line-height: 1.875;
  color: #888888;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  display: none;
}
.teach .common_btn {
  margin-top: 30px;
}

.product {
  margin-top: 5.9%;
}
.product .sw {
  margin-top: 60px;
  position: relative;
}
.product .img {
  position: relative;
  height: 0;
  padding-bottom: 105%;
  overflow: hidden;
  display: block;
  -webkit-transition: 0.5s;
  transition: 0.5s;
  border: 1px solid #eeeeee;
}
.product .img img {
  position: absolute;
  height: 100%;
  width: 100%;
  object-fit: cover;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  -o-object-fit: cover;
     object-fit: cover;
}
.product .img:hover img {
  -webkit-transform: scale(1.05);
      -ms-transform: scale(1.05);
          transform: scale(1.05);
}
.product .tit {
  margin-top: 20px;
  line-height: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  text-align: center;
}
.product .tit a {
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  color: #222;
}
.product .tit a:hover {
  color: #F00000;
}
.product .sub {
  margin-top: 5px;
  color: #888888;
  text-align: center;
  
  overflow: hidden;
text-overflow: ellipsis;
display: -webkit-box;
-webkit-line-clamp: 1;
-webkit-box-orient: vertical;
}
.product .prev {
  left: -55px;
}
.product .next {
  right: -55px;
}

.point {
  display: none;
}

@media screen and (max-width: 1600px) {
  .all {
    padding: 5.2% 0 6.25%;
  }
  .intro .flx {
    margin-top: 35px;
  }
  .teach .sw {
    margin-top: 35px;
  }
  .teach .tit {
    margin-top: 20px;
  }
  .teach .des {
    padding-top: 10px;
  }
  .teach .common_btn {
    margin-top: 25px;
  }
  .construction .sw {
    margin-top: 35px;
  }
  .construction .tit {
    margin-top: 20px;
  }
  .construction .des {
    margin-top: 10px;
  }
  .case .sw {
    margin-top: 35px;
  }
  .case .tit {
    margin-top: 20px;
  }
  .case .des {
    margin-top: 10px;
  }
  .publicity .vio {
    margin-top: 35px;
  }
  .player .player_box {
    margin-top: 35px;
  }
  .teach .flx {
    margin-top: 35px;
  }
  .teach .list {
    margin-top: 20px;
  }
  .teach .list > div {
    width: calc((100% - 40px) / 3);
    margin-right: 20px;
  }
  .product .sw {
    margin-top: 35px;
  }
  .product .tit {
    margin-top: 15px;
  }
}
@media screen and (max-width: 1200px) {
    .player .prev {
  left: -40px;
}
.player .next {
  right: -40px;
}
  .teach .sw {
    margin-top: 25px;
  }
  .teach .prev {
    left: -40px;
  }
  .teach .next {
    right: -40px;
  }
  
  .intro .flx {
    margin-top: 25px;
  }
  .construction .sw {
    margin-top: 25px;
  }
  .construction .prev {
    left: -40px;
  }
  .construction .next {
    right: -40px;
  }
  .case .sw {
    margin-top: 25px;
  }
  .case .prev {
    left: -40px;
  }
  .case .next {
    right: -40px;
  }
  .publicity .vio {
    margin-top: 25px;
  }
  .player .player_box {
    margin-top: 25px;
  }
  .teach .flx {
    margin-top: 25px;
  }
  .teach .list > div {
    width: calc((100% - 20px) / 3);
    margin-right: 10px;
  }
  .teach .list > div:nth-child(n+4) {
    margin-top: 10px;
  }
  .product .sw {
    margin-top: 25px;
  }
  .teach .list {
    margin-top: 15px;
  }
  .product .prev {
    left: -40px;
  }
  .product .next {
    right: -40px;
  }
}
@media screen and (max-width: 768px) {
    .teach .play svg{
        width: 30px;
        height: 30px;
    }
  .all {
    padding: 40px 0;
  }
  .intro .flx {
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
  }
  .intro .l {
    width: 100%;
  }
  .intro .r {
    width: 100%;
    margin-top: 20px;
  }
  .construction {
    margin-top: 30px;
  }
  .point {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
        -ms-flex-pack: center;
            justify-content: center;
    margin-top: 20px;
  }
  .sw_clk {
    display: none;
  }
  .publicity .play svg {
    width: 40px;
    height: 40px;
  }
  .case {
    margin-top: 40px;
  }
  .publicity {
    padding-top: 40px;
  }
  .player {
    margin-top: 40px;
  }
  .teach {
    margin-top: 40px;
  }
  .product {
    margin-top: 40px;
  }
  .teach .flx {
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
  }
  .teach .flx > div {
    width: 100%;
  }
  .teach .flx > div:last-child {
    margin-top: 20px;
  }
}