.scrolldown {
  bottom: 300px;
}

.concept-in {
  line-height: 1.5em;
}

.bg {
  position: relative;
  width: 100%;
  height: calc(100vh - 200px);
  overflow: hidden;
}
.bg .pic {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  background-size: cover;
  background-position: center;
  -moz-transform: scale(1.1) perspective(500px) translateZ(0px);
  -ms-transform: scale(1.1) perspective(500px) translateZ(0px);
  -webkit-transform: scale(1.1) perspective(500px) translateZ(0px);
  transform: scale(1.1) perspective(500px) translateZ(0px);
  -moz-transition: -moz-transform 0s cubic-bezier(0.25, 0.25, 0.75, 0.75);
  -o-transition: -o-transform 0s cubic-bezier(0.25, 0.25, 0.75, 0.75);
  -webkit-transition: -webkit-transform 0s cubic-bezier(0.25, 0.25, 0.75, 0.75);
  transition: transform 0s cubic-bezier(0.25, 0.25, 0.75, 0.75);
}
.bg .pic.move-img {
  -moz-transform: scale(1.1) perspective(500px) translateZ(-50px);
  -ms-transform: scale(1.1) perspective(500px) translateZ(-50px);
  -webkit-transform: scale(1.1) perspective(500px) translateZ(-50px);
  transform: scale(1.1) perspective(500px) translateZ(-50px);
  -moz-transition-duration: 5s;
  -o-transition-duration: 5s;
  -webkit-transition-duration: 5s;
  transition-duration: 5s;
}
.bg .top-mask {
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.1);
  position: relative;
}

.top-title {
  position: absolute;
  left: 20%;
  top: 40%;
  color: #fff;
  z-index: 10;
}
.top-title-big, .top-title-big2 {
  font-size: 40px;
}

.level1 {
  padding: 100px 0;
}
.level1 .box1 {
  display: flex;
  align-items: center;
}
.level1 .concept {
  width: 100%;
}
.level1 .concept-in {
  padding: 30px 50px 50px 50px;
  max-width: 500px;
  color: #bdbdbd;
}
.level1 .concept-pic1 {
  position: relative;
  width: 60%;
}
.level1 .concept-pic1 img {
  width: 100%;
}

.level2 .concept-pic1 {
  width: 70%;
}
.level2 .concept-pic1 img {
  width: 100%;
}
.level2 .concept-pic2 {
  width: 35%;
  padding-left: 60%;
}
.level2 .concept-pic2 img {
  width: 100%;
}
.level2 .concept-pic3 {
  width: 40%;
  padding-left: 15%;
}
.level2 .concept-pic3 img {
  width: 100%;
}

.level3 {
  padding: 150px 0 150px;
  margin-top: 50px;
  background-color: #111;
}
.level3 .concept {
  width: 100%;
  margin: auto;
  max-width: 500px;
  text-align: center;
}
.level3 .concept-in {
  padding: 30px 50px 50px 50px;
  color: #bdbdbd;
}

.level4 .box2 {
  padding: 100px 0;
}
.level4 .box3 {
  display: flex;
}
.level4 .concept {
  width: 100%;
}
.level4 .concept-text {
  position: absolute;
  top: 50%;
  -moz-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  -webkit-transform: translateY(-50%);
  transform: translateY(-50%);
}
.level4 .concept-in {
  padding: 30px 50px 50px 50px;
  max-width: 500px;
  color: #bdbdbd;
}
.level4 .concept-pic1 {
  position: relative;
  width: 60%;
  top: -180px;
}
.level4 .concept-pic1 img {
  width: 100%;
}
.level4 .director-name {
  margin-bottom: 30px;
  font-size: 20px;
}
.level4 .director-name span {
  font-size: 14px;
  margin-left: 20px;
}

.move1 {
  opacity: 0;
  -moz-transform: translateY(-80px);
  -ms-transform: translateY(-80px);
  -webkit-transform: translateY(-80px);
  transform: translateY(-80px);
}

.move1 {
  -moz-transition: opacity 1s, -moz-transform 0.8s;
  -o-transition: opacity 1s, -o-transform 0.8s;
  -webkit-transition: opacity 1s, -webkit-transform 0.8s;
  transition: opacity 1s, transform 0.8s;
}
.move1.show {
  opacity: 1;
  -moz-transform: translate(0px, 0px);
  -ms-transform: translate(0px, 0px);
  -webkit-transform: translate(0px, 0px);
  transform: translate(0px, 0px);
}

.move2 {
  opacity: 0;
  -moz-transform: translateY(80px);
  -ms-transform: translateY(80px);
  -webkit-transform: translateY(80px);
  transform: translateY(80px);
}

.move2 {
  -moz-transition: opacity 1.2s, -moz-transform 1s;
  -o-transition: opacity 1.2s, -o-transform 1s;
  -webkit-transition: opacity 1.2s, -webkit-transform 1s;
  transition: opacity 1.2s, transform 1s;
}
.move2.show {
  opacity: 1;
  -moz-transform: translate(0px, 0px);
  -ms-transform: translate(0px, 0px);
  -webkit-transform: translate(0px, 0px);
  transform: translate(0px, 0px);
}

.move3 {
  opacity: 0;
  -moz-transform: translateY(100px);
  -ms-transform: translateY(100px);
  -webkit-transform: translateY(100px);
  transform: translateY(100px);
}

.move4 {
  opacity: 0;
  -moz-transform: translateY(100px);
  -ms-transform: translateY(100px);
  -webkit-transform: translateY(100px);
  transform: translateY(100px);
}

.move5 {
  opacity: 0;
  -moz-transform: translateY(100px);
  -ms-transform: translateY(100px);
  -webkit-transform: translateY(100px);
  transform: translateY(100px);
}

.move3, .move4, .move5 {
  -moz-transition: opacity 1.5s, -moz-transform 1s;
  -o-transition: opacity 1.5s, -o-transform 1s;
  -webkit-transition: opacity 1.5s, -webkit-transform 1s;
  transition: opacity 1.5s, transform 1s;
}
.move3.show, .move4.show, .move5.show {
  opacity: 1;
  -moz-transform: translate(0px, 0px);
  -ms-transform: translate(0px, 0px);
  -webkit-transform: translate(0px, 0px);
  transform: translate(0px, 0px);
}

.move6 {
  opacity: 0;
  -moz-transform: translateY(80px);
  -ms-transform: translateY(80px);
  -webkit-transform: translateY(80px);
  transform: translateY(80px);
}

.move6 {
  -moz-transition: opacity 1.2s, -moz-transform 0.8s;
  -o-transition: opacity 1.2s, -o-transform 0.8s;
  -webkit-transition: opacity 1.2s, -webkit-transform 0.8s;
  transition: opacity 1.2s, transform 0.8s;
}
.move6.show {
  opacity: 1;
  -moz-transform: translate(0px, 0px);
  -ms-transform: translate(0px, 0px);
  -webkit-transform: translate(0px, 0px);
  transform: translate(0px, 0px);
}

.move7 {
  opacity: 0;
  -moz-transform: translateY(-80px);
  -ms-transform: translateY(-80px);
  -webkit-transform: translateY(-80px);
  transform: translateY(-80px);
}

.move7 {
  -moz-transition: opacity 1.5s, -moz-transform 1s;
  -o-transition: opacity 1.5s, -o-transform 1s;
  -webkit-transition: opacity 1.5s, -webkit-transform 1s;
  transition: opacity 1.5s, transform 1s;
}
.move7.show {
  opacity: 1;
  -moz-transform: translate(0px, 0px);
  -ms-transform: translate(0px, 0px);
  -webkit-transform: translate(0px, 0px);
  transform: translate(0px, 0px);
}

.move8 {
  opacity: 0;
  -moz-transform: translateY(100px);
  -ms-transform: translateY(100px);
  -webkit-transform: translateY(100px);
  transform: translateY(100px);
}

.move8 {
  -moz-transition: opacity 1.5s, -moz-transform 1s;
  -o-transition: opacity 1.5s, -o-transform 1s;
  -webkit-transition: opacity 1.5s, -webkit-transform 1s;
  transition: opacity 1.5s, transform 1s;
}
.move8.show {
  opacity: 1;
  -moz-transform: translate(0px, 0px);
  -ms-transform: translate(0px, 0px);
  -webkit-transform: translate(0px, 0px);
  transform: translate(0px, 0px);
}

@media screen and (max-width: 1100px) {
  .level1 .concept {
    margin-top: 80px;
  }
  .level1 .concept-pic1 {
    width: 68%;
  }
}
@media screen and (max-width: 720px) {
  .level1 .concept {
    margin: 0;
  }
  .level1 .concept-text {
    position: relative;
    margin: 0;
  }
  .level1 .concept-pic1 {
    display: none;
  }

  .level2 .concept-pic1 {
    width: 100%;
  }
  .level2 .concept-pic2 {
    width: 50%;
    padding: 50px 0 50px 40%;
  }
  .level2 .concept-pic3 {
    width: 55%;
  }

  .level3 {
    padding: 100px 0;
  }

  .level4 .box3 {
    display: block;
  }
  .level4 .concept-text {
    position: relative;
    top: 0;
    -moz-transform: translateY(0);
    -ms-transform: translateY(0);
    -webkit-transform: translateY(0);
    transform: translateY(0);
  }
  .level4 .concept-pic1 {
    top: 0;
    margin: auto;
  }
}
@media screen and (max-width: 460px) {
  .level1 {
    padding: 100px 0 50px;
  }
  .level1 .concept-in {
    padding: 30px 0px 50px 50px;
  }

  .level2 .concept-pic2 {
    width: 70%;
    padding: 10px 0 10px 25%;
  }
  .level2 .concept-pic3 {
    width: 70%;
    padding-left: 10%;
  }

  .level3 {
    padding: 80px 0;
  }
  .level3 .concept-in {
    padding: 30px 0 0 0;
  }

  .level4 .concept-pic1 {
    width: 100%;
  }
  .level4 .concept-in {
    padding: 30px 0px 50px 50px;
  }

  .top-title {
    left: 10%;
  }
}
@media screen and (max-height: 650px) {
  .bg {
    height: calc(100vh - 50px);
  }

  .scrolldown {
    bottom: 150px;
  }
}