body,
html {
  font-size: 0;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  color: #fff;
  width: 100%;
  font-family: Helvetica Neue, PingFang SC, Helvetica, Arial, Hiragino Sans GB,
    Microsoft Yahei, \\5FAE\8F6F\96C5\9ED1, STHeiti, \\534E\6587\7EC6\9ED1,
    sans-serif;
}
body img,
html img {
  width: 100%;
}
* {
  box-sizing: border-box;
}
p {
  margin: 0;
  padding: 0;
}
.center-box {
  max-width: 1200px;
  margin: 0 auto;
}
.hide {
  display: none !important;
}
.opci-hide {
  opacity: 0;
}
.ani-bg {
  -webkit-animation: zoom 8s ease-in-out 2s alternate infinite;
  animation: zoom 8s ease-in-out 2s alternate infinite;
}
.fade-in {
  -webkit-animation: fade-in 0.4s ease both;
  animation: fade-in 0.4s ease both;
}
.fade-out {
  -webkit-animation: fade-out 0.4s ease both;
  animation: fade-out 0.4s ease both;
}
@-webkit-keyframes zoom {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08);
  }
  100% {
    transform: scale(1);
  }
}
@keyframes zoom {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08);
  }
  100% {
    transform: scale(1);
  }
}
@-webkit-keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
    z-index: 2;
  }
}
@keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
    z-index: 2;
  }
}
@-webkit-keyframes fade-out {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    z-index: 1;
  }
}
@keyframes fade-out {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    z-index: 1;
  }
}
header {
  width: 100%;
  position: fixed;
  top: 0;
  z-index: 2;
}
header #header-block {
  width: 100%;
  height: 84px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 82px;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
}
header #header-block .header-logo {
  width: 92px;
  height: 24px;
  position: relative;
}
header #header-block .header-logo img {
  position: absolute;
}
header #header-block .header-logo .logo-color-img {
  opacity: 0;
}
header #header-block .header-channel {
  width: 110px;
  height: 34px;
  border-radius: 28px;
  text-align: center;
  font-size: 16px;
  cursor: pointer;
}
header .header-opacity .header-channel {
  line-height: 32px;
  border: 1px solid #fff;
}
header .header-opacity .header-channel:hover {
  background: rgba(255, 255, 255, 0.3);
}
header .header-white {
  box-shadow: 0 1px 1px 1px rgba(0, 0, 0, 0.1);
  background-color: #fff;
}
header .header-white .header-channel {
  background: linear-gradient(270deg, rgba(254, 82, 101, 0.99) 0, #fe926e 100%);
  line-height: 34px;
}
header .header-white .header-channel:hover {
  background: linear-gradient(270deg, #d33f4f 0, #e4815f 100%);
}
.title {
  text-align: center;
  margin-bottom: 30px;
}
.title .title_main {
  color: #333;
  font-size: 46px;
  margin-bottom: 8px;
}
.title .title_sub {
  color: #979797;
  font-size: 32px;
  letter-spacing: 1px;
}
.first {
  position: relative;
  width: 100%;
  overflow: hidden;
  max-height: 752px;
}
.first .first-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
}
.first .first-main {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.first .first-main .center-box {
  padding-left: 60px;
}
.first .first-main .first-title {
  padding-top: 18%;
}
.first .first-main .title_main {
  font-size: 58px;
}
.first .first-main .title_sub {
  font-size: 36px;
  letter-spacing: 2px;
}
.first .first-main .first-join {
  width: 220px;
  height: 58px;
  background: linear-gradient(270deg, rgba(254, 82, 101, 0.99) 0, #fe926e 100%);
  border-radius: 48px;
  text-align: center;
  line-height: 58px;
  font-size: 26px;
  margin-top: 4%;
  letter-spacing: 2px;
  padding-left: 4px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.first .first-main .first-join:hover {
  background: linear-gradient(270deg, #d33f4f 0, #e4815f 100%);
}
.introduction {
  width: 100%;
  background-color: #fff;
  padding: 128px 0;
}
.introduction .introduction-main {
  width: calc(37% + 480px);
  margin: 0 auto;
}
.introduction .introduction-main p {
  font-size: 20px;
  color: #4a4a4a;
  letter-spacing: 1px;
  line-height: 40px;
  text-align: justify;
  margin-bottom: 50px;
}
.introduction .introduction-main p:last-child {
  margin-bottom: 0;
}
.introduction .introduction-main p:nth-child(4) {
  margin-bottom: 0;
}
.course {
  width: 100%;
  background-color: #fafafa;
  padding: 128px 0;
}
.course .container {
  width: 100%;
  max-width: 1200px;
  text-align: center;
}
.course .container .slide {
  width: 80%;
  transform: scale(0.85);
  margin: 0 auto;
  transform-origin: center center;
  position: relative;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(238, 238, 238, 0.6);
  cursor: pointer;
  background-color: #fff;
}
.course .container .slide p {
  font-size: 20px;
  color: #979797;
  padding: 10px 20px 20px 20px;
  line-height: 1.7;
}
.course .container .slide .banner-name {
  font-size: 28px;
  text-align: center;
  font-weight: 700;
  padding: 10px 0 0;
  color: #4a4a4a;
}
.second {
  width: 100%;
  background-color: #fff;
  padding: 128px 0;
}
.second .second-main {
  display: flex;
  justify-content: center;
}
.second .second-main .main-icon {
  width: 120px;
  margin-right: 12.4%;
}
.second .second-main .main-icon p {
  color: #4a4a4a;
  font-size: 24px;
  text-align: center;
  margin-top: 20px;
}
.second .second-main .main-icon:last-child {
  margin-right: 0;
}
.third {
  width: 100%;
  padding: 73px 0;
  background-color: #fafafa;
}
.third .third-code {
  width: 320px;
  height: 386px;
  background: #eaeaea;
  border-radius: 29px;
  margin: 0 auto;
  text-align: center;
}
.third .third-code img {
  width: 220px;
  margin: 46px 0 20px;
}
.third .third-code p {
  color: #4a4a4a;
  font-size: 20px;
  letter-spacing: 1px;
}
.code-mask {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  left: 0;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  z-index: 1;
}
.code-mask .mask-main {
  padding: 26px 32px;
  padding-bottom: 30px;
  background-color: #fff;
  text-align: center;
  border-radius: 25px;
}
.code-mask .mask-main img {
  width: 237px;
  margin-bottom: 4px;
}
.code-mask .mask-main p {
  font-size: 28px;
  font-weight: 700;
  line-height: 39px;
  letter-spacing: 3px;
  color: #161616;
}
.code-mask .mask-close {
  width: 55px;
  height: 55px;
  margin-top: 27px;
  cursor: pointer;
}
.footer {
  width: 100%;
  position: relative;
  max-height: 200px;
  overflow: hidden;
}
.footer .footer-main {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  display: flex;
}
.footer .footer-main .footer-section {
  width: 50%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}
.footer .footer-main .footer-section:first-child {
  position: relative;
}
.footer .footer-main .footer-section:first-child::after {
  content: "";
  height: 40%;
  position: absolute;
  right: 0;
  width: 1px;
  background-color: #fff;
  top: 30%;
}
.footer .footer-main .footer-section img {
  width: 50px;
}
.footer .footer-main .footer-section .section-word {
  font-size: 18px;
  margin-left: 28px;
}
footer {
  width: 100%;
  background-color: #462308;
  line-height: 20px;
  padding: 20px 0;
  color: #e1e1e1;
  text-align: center;
  font-size: 12px;
  letter-spacing: 1px;
}
footer .font-40 {
  font-size: 20px;
  line-height: 30px;
  margin-bottom: 4px;
}
footer a {
  color: #e1e1e1;
  text-decoration: none;
}