.banner {
  position: relative;
  overflow: hidden;
}
.banner .tu {
  position: relative;
  overflow: hidden;
  height: 100vh;
  z-index: 1;
}
.banner .tu img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.banner .tu video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.banner .logos {
  width: 23%;
  position: absolute;
  left: 50%;
  top: 55%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  z-index: 2;
}
.banner .logos img {
  width: 100%;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.banner .logos:hover img {
  transform: scale(1.05);
  -webkit-transform: scale(1.05);
  -moz-transform: scale(1.05);
  -ms-transform: scale(1.05);
}
.ctn1 {
  position: relative;
  overflow: hidden;
}
.ctn1 .con {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.ctn1 .con .left {
  width: 35.2%;
  position: relative;
  overflow: hidden;
}
.ctn1 .con .left:before {
  content: '';
  display: block;
  padding-top: calc(622 / 506 * 100%);
}
.ctn1 .con .left img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  left: 0;
  top: 0;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn1 .con .left:hover img {
  transform: scale(1.05);
  -webkit-transform: scale(1.05);
  -moz-transform: scale(1.05);
  -ms-transform: scale(1.05);
}
.ctn1 .con .right {
  width: 52%;
  padding-right: 60px;
}
.ctn1 .con .right h2 {
  display: inline-block;
  background: linear-gradient(to right, #2d54d2, #be2de8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.ctn1 .con .right h3 {
  margin: 20px 0 100px;
}
.ctn1 .con .right .text p {
  line-height: 1.7;
}
.ctn2 {
  position: relative;
  overflow: hidden;
}
.ctn2 ul {
  display: flex;
  justify-content: space-between;
}
.ctn2 ul li {
  flex: 1;
  position: relative;
}
.ctn2 ul li .tu {
  position: relative;
  overflow: hidden;
}
.ctn2 ul li .tu:before {
  content: '';
  display: block;
  padding-top: calc(340 / 480 * 100%);
}
.ctn2 ul li .tu img {
  position: absolute;
  width: 101%;
  height: 101%;
  object-fit: cover;
  left: 0;
  top: 0;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn2 ul li h2 {
  position: absolute;
  width: 100%;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  -webkit-transform: translateY(-50%);
  -moz-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  z-index: 2;
  text-align: center;
  color: #fff;
}
.ctn2 ul li:hover .tu img {
  transform: scale(1.05);
  -webkit-transform: scale(1.05);
  -moz-transform: scale(1.05);
  -ms-transform: scale(1.05);
}
.ctn3 {
  position: relative;
  overflow: hidden;
  padding: 150px 0 260px;
}
.ctn3 .top h2 {
  text-align: center;
  line-height: 1.7;
}
.ctn3 .bottom {
  padding-top: 80px;
  position: relative;
}
.ctn3 .bottom .tu {
  width: 42%;
  margin: 0 auto;
  position: relative;
}
.ctn3 .bottom .tu:before {
  content: '';
  display: block;
  padding-top: calc(384 / 714 * 100%);
}
.ctn3 .bottom .tu img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  left: 0;
  top: 0;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn3 .bottom .tu:hover img {
  transform: scale(1.05);
  -webkit-transform: scale(1.05);
  -moz-transform: scale(1.05);
  -ms-transform: scale(1.05);
}
.ctn3 .bottom ul li {
  position: absolute;
  width: 19.2%;
  background: #2945ae;
  border-radius: 10px;
  padding: 20px;
}
.ctn3 .bottom ul li p {
  color: #fff;
}
.ctn3 .bottom ul li:nth-child(1) {
  left: 0;
  top: 0;
}
.ctn3 .bottom ul li:nth-child(1) .xian {
  position: absolute;
  top: 100%;
  left: 50%;
  width: 200px;
  height: 42px;
}
.ctn3 .bottom ul li:nth-child(1) .xian span {
  position: absolute;
  left: 0;
  top: 0;
  width: 84px;
  height: 1px;
  background: #172fb0;
  transform: rotate(27deg);
  transform-origin: left center;
}
.ctn3 .bottom ul li:nth-child(1) .xian::before {
  content: "";
  position: absolute;
  left: 74px;
  top: 38px;
  width: 126px;
  height: 1px;
  background: #172fb0;
}
.ctn3 .bottom ul li:nth-child(1) .xian i {
  position: absolute;
  right: 0;
  top: 36px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #172fb0;
}
.ctn3 .bottom ul li:nth-child(2) {
    top: 112%;
    left: 6%;
}
.ctn3 .bottom ul li:nth-child(2) .xian {
  position: absolute;
  top: 50%;
  left: 100%;
  width: 138px;
  height: 52px;
}
.ctn3 .bottom ul li:nth-child(2) .xian span {
  position: absolute;
  left: 0;
  top: 0;
  width: 84px;
  height: 1px;
  background: #172fb0;
}
.ctn3 .bottom ul li:nth-child(2) .xian::before {
  content: "";
  position: absolute;
  left: 84px;
  top: 0;
  width: 52px;
  height: 1px;
  background: #172fb0;
  transform: rotate(-45deg);
  transform-origin: left center;
}
.ctn3 .bottom ul li:nth-child(2) .xian i {
  position: absolute;
  right: 14px;
  top: -40px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #172fb0;
}
.ctn3 .bottom ul li:nth-child(3) {
  right: 0;
  top: 80px;
}
.ctn3 .bottom ul li:nth-child(3) .xian {
  position: absolute;
  top: 100%;
  left: 50%;
  width: 178px;
  height: 52px;
}
.ctn3 .bottom ul li:nth-child(3) .xian span {
  position: absolute;
  left: 0;
  top: 0;
  width: 52px;
  height: 1px;
  background: #172fb0;
  transform: rotate(117deg);
  transform-origin: left center;
}
.ctn3 .bottom ul li:nth-child(3) .xian::before {
  content: "";
  position: absolute;
  left: -149px;
  top: 46px;
  width: 126px;
  height: 1px;
  background: #172fb0;
}
.ctn3 .bottom ul li:nth-child(3) .xian i {
  position: absolute;
  left: -150px;
  top: 44px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #172fb0;
}
.ctn4 {
  position: relative;
  overflow: hidden;
}
.ctn4 .tu {
  position: relative;
  overflow: hidden;
}
.ctn4 .tu:before {
  content: '';
  display: block;
  padding-top: calc(400 / 1920 * 100%);
}
.ctn4 .tu img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  left: 0;
  top: 0;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn4 .tu:hover img {
  transform: scale(1.05);
  -webkit-transform: scale(1.05);
  -moz-transform: scale(1.05);
  -ms-transform: scale(1.05);
}
.ctn4 .text {
  position: absolute;
  width: 100%;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  -webkit-transform: translateY(-50%);
  -moz-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  color: #fff;
  text-align: center;
}
.ctn4 .text h2 {
  font-size: 64px;
}
@media screen and (max-width: 1600px) {
  .ctn1 .con .right {
    padding-right: 3vw;
  }
  .ctn1 .con .right h3 {
    margin: 1vw 0 5vw;
  }
  .ctn3 {
    padding: 7.5vw 0 16vw;
  }
  .ctn4 .text h2 {
    font-size: 3.2vw;
  }
}
@media screen and (max-width: 1440px) {
  .ctn1 .con .right h3 {
    margin: 1vw 0 2vw;
  }
  .ctn3 .bottom ul li:nth-child(1) .xian {
    transform: scale(0.8);
    -webkit-transform: scale(0.8);
    -moz-transform: scale(0.8);
    -ms-transform: scale(0.8);
    transform-origin: top left;
  }
}
@media screen and (max-width: 1200px) {
  .banner .tu {
    height: auto;
  }
  .banner .tu:before {
    content: '';
    display: block;
    padding-top: calc(1000 / 1920 * 100%);
  }
  .banner .tu img {
    position: absolute;
    left: 0;
    top: 0;
  }
  .banner .tu video {
    position: absolute;
    left: 0;
    top: 0;
  }
  .ctn3 {
    padding: 7.5vw 0 20vw;
  }
  .ctn3 .bottom ul li {
    padding: 14px;
  }
  .ctn3 .bottom ul li:nth-child(1) .xian {
    transform: scale(0.7);
    -webkit-transform: scale(0.7);
    -moz-transform: scale(0.7);
    -ms-transform: scale(0.7);
  }
  .ctn3 .bottom ul li:nth-child(3) .xian {
    transform: scale(0.9);
    -webkit-transform: scale(0.9);
    -moz-transform: scale(0.9);
    -ms-transform: scale(0.9);
  }
}
@media screen and (max-width: 1024px) {
  .banner {
    margin-top: 60px;
  }
  .banner .logos {
    top: 50%;
  }
}
@media screen and (max-width: 768px) {
  .banner .logos {
    width: 32%;
  }
  .ctn1 .con {
    display: block;
  }
  .ctn1 .con .left {
    width: 100%;
  }
  .ctn1 .con .right {
    width: 100%;
    padding-right: 0;
    margin-top: 30px;
  }
  .ctn1 .con .right h3 {
    margin: 10px 0 20px;
  }
  .ctn1 .con .right .text p {
    line-height: 1.6;
  }
  .ctn2 {
    padding: 0 5%;
  }
  .ctn2 ul {
    display: block;
  }
  .ctn2 ul li {
    width: 100%;
  }
  .ctn2 ul li:not(:first-child) {
    margin-top: 20px;
  }
  .ctn3 {
    padding: 14vw 0;
  }
  .ctn3 .bottom {
    padding-top: 30px;
  }
  .ctn3 .bottom .tu {
    width: 60%;
    margin-bottom: 30px;
  }
  .ctn3 .bottom ul li {
    position: relative;
    width: 100%;
    left: 0!important;
    top: 0!important;
    margin-top: 10px;
  }
  .ctn3 .bottom ul li .xian {
    display: none;
  }
  .ctn4 .text h2 {
    font-size: 24px;
  }
  .ctn4 .text h3 {
    font-size: 14px;
  }
  .ctn4 .tu:before{
    padding-top: calc(600 / 1920 * 100%);
  }
}