header {
  width: 100%;
  height: 770px;
  background: url(../img/banner.jpg) no-repeat center 0;
  background-size: cover;
}
section .top {
  width: 100%;
  height: 294px;
  background: url(../img/wuyan.jpg) no-repeat center bottom;
  background-size: 100% auto;
}
section .top .middle {
  text-align: center;
  padding-top: 35px;
}
section .btn-box {
  width: 100%;
  height: 117px;
  background: url(../img/bu-bg.jpg) no-repeat center 0;
  background-size: 100% 100%;
}
section .btn-box .middle {
  height: 117px;
  position: relative;
}
section .btn-box .middle .btn {
  width: 110px;
  height: 100%;
  position: relative;
  float: left;
  margin-left: 8px;
}
section .btn-box .middle .btn .btn-t {
  -webkit-filter: grayscale(50%);
  -moz-filter: grayscale(50%);
  -ms-filter: grayscale(50%);
  -o-filter: grayscale(50%);
  filter: grayscale(50%);
  filter: gray;
  width: 110px;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
  cursor: pointer;
}
section .btn-box .middle .btn .btn-s {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  font-size: 20px;
  line-height: 100px;
  text-align: center;
  color: #fff;
}
section .btn-box .middle .btn .btn-mb {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 3;
}
section .btn-box .middle .btn .btn-mb2 {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
}
section .btn-box .middle .btn .btn-mb2.active {
  z-index: 5;
}
section .btn-box .middle .btn.active .btn-t {
  filter: grayscale(0%);
  z-index: 4;
}
section .btn-box .middle .btn:nth-of-type(1) {
  margin-left: 0;
}
section .url {
  display: block;
  width: 100%;
  height: 392px;
  margin-top: 10px;
}
section .url:nth-of-type(1) {
  background: url(../img/1.jpg) no-repeat center 0;
  background-size: cover;
}
section .url:nth-of-type(2) {
  background: url(../img/2.jpg) no-repeat center 0;
  background-size: cover;
}
section .url:nth-of-type(3) {
  background: url(../img/3.jpg) no-repeat center 0;
  background-size: cover;
}
section .url:nth-of-type(4) {
  background: url(../img/4.jpg) no-repeat center 0;
  background-size: cover;
}
section #video-box {
  width: 100%;
  height: 900px;
  position: relative;
}
section #video-box video {
  width: 100%;
  height: 100%;
}
section #video-box .time {
  position: absolute;
  bottom: 17%;
  left: 0;
  width: 100%;
  height: auto;
  font-family: "微软雅黑";
  font-size: 15px;
  color: #fff;
  text-align: center;
}
section .hd-box {
  width: 100%;
  height: 441px;
  background: url(../img/hd-bg.jpg) no-repeat center 0;
  background-size: cover;
  text-align: center;
}
section .hd-box .text {
  width: 730px;
  height: 52px;
  margin: 100px auto 50px auto;
}
section .hd-box .hd-btn {
  width: 100%;
  display: flex;
  flex-direction: row;
  justify-content: space-around;
}
section .hd-box .hd-btn .hd-bt {
  width: 288px;
  height: auto;
  position: relative;
  cursor: pointer;
}
section .hd-box .hd-btn .hd-bt p {
  font-family: "微软雅黑";
  font-size: 15px;
  color: #cd7f4b;
  padding-top: 15px;
}
section .hd-box .hd-btn .hd-bt p span {
  font-size: 22px;
  padding-left: 2px;
  padding-right: 2px;
}
canvas {
  display: block;
  position: absolute;
  bottom: 130px;
  right: -60px;
  z-index: 20;
  cursor: pointer;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}