.main-page {
  height: 100vh;
}
.header {
  box-sizing: border-box;
  position: fixed;
  top: 0;
  left: 0;
  padding: 0 200px;
  width: 100%;
  height: 80px;
  z-index: 222;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  background: rgba(0, 0, 0, 0);
}
.header .logo-box {
  width: 465px;
  height: 46px;
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 10px;
}
.header .logo-box .logo {
  width: 60px;
  height: 61px;
  background-image: url(../images/logo.png);
}
.header .nav-bar {
  position: relative;
  height: 37px;
}
.header .nav-bar .nav-active-tag {
  position: absolute;
  bottom: 0;
  width: 30px;
  height: 4px;
  background: #ffffff;
  border-radius: 4px 4px 4px 4px;
}
.header .nav-bar ul.tab {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 70px;
}
.header .nav-bar ul.tab li {
  height: 28px;
  line-height: 21px;
  font-size: 16px;
  white-space: nowrap;
}
.header .nav-bar ul.tab li a {
  color: #fff;
}
.slider-item {
  height: 100vh;
  overflow: auto;
}
.page {
  position: relative;
  width: 100%;
  z-index: 4;
}
.content {
  position: absolute;
  overflow: hidden;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 2;
  transition: transform 1s ease;
  backface-visibility: hidden;
}
.size-bg-box {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}
.elem {
  position: absolute;
}
.page1 {
  height: 100vh;
  color: #fff;
  z-index: 2;
  position: relative;
}
.page1 .bg1 {
  background-image: url(../images/page1-bg.png);
}
.page1 .page-content {
  position: relative;
  padding-top: 47vh;
}
.page1 .t1 {
  margin: 0 auto;
  font-size: 50px;
  color: #fff;
  text-align: center;
  font-weight: bold;
  text-shadow: 0 0 20px rgba(0, 0, 0, 0.6);
}
.page1 .mouse-box {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
}
.page1 .mouse-box .mouse-bg {
  margin: 0 auto;
  width: 22px;
  height: 30px;
  background-image: url(../images/e0.png);
  animation: mouse-animate 4s ease-in-out infinite;
}
.page1 .mouse-box .mouse-tips {
  margin-top: 16px;
  height: 21px;
  line-height: 21px;
  font-size: 16px;
  color: #ffffff;
}
.page2 {
  height: 980px;
  color: #000;
  z-index: 1;
  display: flex;
}
.page2 .bg2 {
  background-image: url(../images/page2-bg.png);
}
.page2 .content {
  width: 100%;
  position: relative;
  overflow: visible;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.page2 .page2-right {
  display: flex;
  flex-direction: row;
  justify-content: center;
  position: relative;
}
.page2 .page2-right .item-wrap .item {
  width: 400px;
  height: 980px;
  line-height: 980px;
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
}
.page2 .page2-right .item-wrap .item .item-t1 {
  height: 30px;
  line-height: 30px;
  text-align: center;
  color: #fff;
  position: absolute;
  top: 575px;
  left: 50%;
  text-wrap: nowrap;
  transform: translateX(-50%);
}
.page2 .page2-right .item-wrap .item .item-bg-box {
  width: 120px;
  height: 120px;
  box-sizing: border-box;
  padding: 28px;
  border: 1px solid #888888;
  border-radius: 50%;
}
.page2 .page2-right .item-wrap .item .item-bg-box .bg1 {
  width: 64px;
  height: 64px;
  background-image: url(../images/page2-item1.png);
}
.page2 .page2-right .item-wrap .item .item-bg-box .bg2 {
  width: 64px;
  height: 64px;
  background-image: url(../images/page2-item2.png);
}
.page2 .page2-right .item-wrap .item .item-bg-box .bg3 {
  width: 64px;
  height: 64px;
  background-image: url(../images/page2-item3.png);
}
.page2 .page2-right .item-wrap .item:hover {
  background: rgba(0, 0, 0, 0.25);
}
.page3 {
  height: 980px;
  width: 100%;
  z-index: 1;
}
.page3 .content {
  position: relative;
  overflow: hidden;
  width: 100%;
}
.page3 .content .page3-left {
  width: 50%;
  float: left;
  height: 980px;
  background-image: url(../images/page3-bg.png);
}
.page3 .content .page3-right {
  width: 50%;
  float: left;
}
.page3 .content .page3-right .page3-ab {
  padding: 15% 15%;
}
.page3 .content .page3-right .page3-ab .page3-title {
  height: 40px;
  font-size: 30px;
  color: #FFFFFF;
  line-height: 40px;
  text-align: left;
}
.page3 .content .page3-right .page3-ab .page3-subtitle {
  margin-top: 16px;
  height: 26px;
  line-height: 26px;
  font-size: 20px;
  color: #999999;
  text-align: left;
}
.page3 .content .page3-right .page3-ab .about-box {
  margin-top: 50px;
}
.page3 .content .page3-right .page3-ab .about-box .about {
  font-size: 16px;
  color: #999999;
  line-height: 30px;
}
.page4 {
  height: 980px;
  color: #000;
  z-index: 1;
}
.page4 .content {
  position: relative;
  padding-top: 180px;
  overflow: visible;
  width: 100%;
}
.page4 .content .page4-left {
  width: 100%;
}
.page4 .content .page4-left .page4-title {
  min-width: 175px;
  height: 47px;
  padding-left: 8%;
  font-size: 36px;
  color: #FFFFFF;
  font-weight: bold;
}
.page4 .content .page4-left .page4-subtitle {
  margin-top: 6px;
  height: 26px;
  font-size: 20px;
  color: #999999;
  padding-left: 8%;
}
.page4 .content .page4-right .item-box {
  margin: 40px auto;
  width: 1200px;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 80px;
}
.page4 .content .page4-right .item-box .item {
  width: 240px;
  height: 80px;
  margin: 60px 0;
}
.footer {
  position: relative;
  display: flex;
  align-items: center;
  padding: 34px 200px;
  background-color: #000000;
  color: #B9B9B9;
  z-index: 10;
}
.footer a {
  color: #B9B9B9;
  margin-right: 20px;
}
.footer .footer-left {
  flex: 1;
  font-size: 14px;
}
.footer .footer-left > p:not(:last-child) {
  margin-bottom: 15px;
  line-height: 1.25;
}
.footer .footer-left img {
  display: inline-block;
  width: 20px;
  height: 22px;
  vertical-align: middle;
}
.footer .footer-right {
  flex-shrink: 0;
}
.footer .footer-right .phone-icon {
  float: left;
  margin-top: 4px;
  width: 37px;
  height: 37px;
}
.footer .footer-right > p {
  margin-left: 47px;
  white-space: nowrap;
}
.footer .footer-right .phone-number {
  margin-top: 4px;
  line-height: 26px;
  font-weight: bold;
  font-size: 20px;
  color: #fff;
}
@keyframes mouse-animate {
  0% {
    transform: translateY(-10px);
  }
  50% {
    transform: translateY(10px);
  }
  100% {
    transform: translateY(-10px);
  }
}