html,
body,
p {
  padding: 0;
  margin: 0;
  font-family: "Helvetica Neue", Helvetica,  "Hiragino Sans GB", "Hiragino Sans GB W3", "Microsoft YaHei", sans-serif;
}

::-webkit-scrollbar-track-piece {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 0;
}
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.6);
  border-radius: 10px;
}

.container {
  position: fixed;
  width: 100vw;
  height: 100vh;
  background: url("../img/index-1.jpg") center/cover no-repeat;
}
.nav-bar {
  position: fixed;
  top: 0;
  z-index: 9;
  width: 100%;
  height: 70px;
  display: flex;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.3);
  color: #fff;
  padding: 0 30px;
  box-sizing: border-box;
}
.logo {
  width: 200px;
  height: 54px;
  background: url("../img/logo.png") center/cover no-repeat;
}
.menu {
  display: flex;
  align-items: center;
  font-size: 24px;
  font-weight: 600;
  margin-left: 50px;
}
.m-i {
  margin-left: 50px;
}
.m-i.active {
  color: #ec6803;
}
.m-i:hover {
  color: #ec6803;
  cursor: pointer;
}
.cont {
  margin-top: 70px;
  height: calc(100vh - 70px);
  width: 100%;
  overflow-y: scroll;
}
.cont .page-1 {
  background: linear-gradient(to right, #ec6803, #ffffff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin: 10vh 0px 0 8vw;
  height: calc(100vh - 70px);
}
.cont .page-1 .platform {
  font-size: 30px;
  font-weight: 600;
}
.cont .page-1 .desc {
  font-size: 40px;
  font-weight: 600;
  margin: 30px 0;
}
.cont .page-1 .tips {
  font-size: 22px;
  font-weight: 600;
}
.page-2,
.page-3,
.page-4,
.page-5,
.page-6,
.page-7 {
  height: 100vh;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #fff;
  margin-top: 1px;
}
.cont .page-2 .bg {
  width: 1200px;
  height: 667px;
  background: url("../img/index-2.png") center/100% no-repeat;
}
.cont .page-3 .bg {
  width: 1200px;
  height: 670px;
  background: url("../img/index-3.png") center/100% no-repeat;
}
.cont .page-4 .bg {
  width: 1200px;
  height: 675px;
  background: url("../img/index-4.png") center/100% no-repeat;
}
.cont .page-5 .bg {
  width: 1200px;
  height: 672px;
  background: url("../img/index-5.png") center/100% no-repeat;
}
.cont .page-6 .bg {
  width: 1200px;
  height: 674px;
  background: url("../img/index-6.png") center/100% no-repeat;
}
.cont .page-7 {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  height: 80vh;
}
.cont .page-7 .down-list {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 50px 0;
}
.cont .page-7 .d-i {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.cont .page-7 .d-i .icon {
  position: relative;
  width: 120px;
  height: 120px;
  background-color: #ec6803;
  border-radius: 50%;
  margin: 0 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-7 .d-i .icon .overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.3s ease;
  border-radius: 50%;
  font-weight: 600;
}
.cont .page-7 .d-i .icon:hover {
  cursor: pointer;
}
.cont .page-7 .d-i .icon:hover .overlay {
  opacity: 1;
}
.cont .page-7 .d-i .icon .img {
  width: 50px;
  height: 50px;
}
.cont .page-7 .d-i .title {
  font-size: 20px;
  font-weight: 600;
}
.cont .page-7 .desc {
  border: 1px solid #ddd;
  border-radius: 5px;
  padding: 20px;
  box-sizing: border-box;
  text-align: center;
}
.page-7 .desc .txt {
  font-size: 18px;
}
.demo-list {
  display: flex;
  margin-top: 20px;
}
.demo-list .d-i {
  width: 170px;
  border: 1px solid #ddd;
  padding: 10px;
  box-sizing: border-box;
  border-radius: 5px;
  margin-right: 20px;
}
.demo-list .d-i:last-child {
  margin-right: 0;
}
.demo-list .d-i img {
  width: 150px;
  height: 100%;
}
.footer {
  height: 40px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.8);
  color: #fff;
  font-size: 13px;
}
.footer a {
  color: #ec6803;
}
.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 40px;
  height: 40px;
  line-height: 40px;
  text-align: center;
  background: #333;
  color: #fff;
  border-radius: 50%;
  text-decoration: none;
  font-size: 24px;
  z-index: 9999;
  display: none;
}
.back-to-top:hover {
  cursor: pointer;
}