* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  line-height: 1.5;
  font-size: 16rem;
  text-decoration: none;
  list-style: none;
}

html,
body {
  background: #17a7f7;
  font-size: calc(100vw / 1920);
}

dialog {
  border: none;
  padding: 0;
  background: transparent;
  margin: auto;
  max-width: 90vw;
  max-height: 90vh;
}

dialog::backdrop {
  background: rgba(0, 0, 0, 0.6);
}


header {
  position: relative;
}

.hero {
  padding-top: 65rem;
  width: 100%;
  height: 1050rem;
  background: url(./images/hero.jpg) no-repeat;
  background-size: 100%;
  background-position: bottom center;
}

.logo {
  margin: 0 auto;
  width: 525rem;
  height: 54rem;
  background: url(./images/logo.png) no-repeat;
  background-size: 100%;
}

.note {
  position: absolute;
  top: 745rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 162rem 66rem 0 66rem;
  max-width: 89%;
  width: 100%;
  min-height: 435rem;
  background: url(./images/book.png) no-repeat;
  background-size: 100% 435rem;
}

.note .inner {
  padding: 21rem 15rem;
  width: 100%;
  background: linear-gradient(to bottom, #1BAEFF 0%, #1158ff 100%);
  border: 2rem solid #ffffff;
  border-radius: 10rem;
}

.note .content {
  padding: 63rem 48rem;
  text-indent: 2em;
  color: #d1feff;
  font-size: 34rem;
  box-shadow: inset 0 0 12px 8px rgb(109, 238, 248, 0.5);
  border: 2rem solid #6deef8;
  border-radius: 10rem;
}

.section {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 61rem;
}

.section .content {
  padding: 23rem;
  width: 100%;
  height: 100%;
  background: rgb(17, 88, 255, 0.3);
  border-radius: 46rem;
}

.section .content .wrapper {
  border: 4rem solid #ffffff;
  border-radius: 42rem;
  min-height: 960rem;
  height: 100%;
  background-color: #58bff7;
}

.section .content .header {
  position: relative;
  display: flex;
  flex-direction: column;
}

.section .content .header .title {
  position: absolute;
  left: 50%;
  transform: translate(-50%, calc(-100% - 4rem));
  width: 924rem;
  height: 122rem;
}

.section .content .header .inner {
  height: 100%;
  border-radius: 38rem 38rem 0 0;
  overflow: hidden;
}

.section .content .header .inner .cover {
  width: 100%;
}

.section .content .header .inner .character {
  position: absolute;
  top: -120rem;
  right: -121rem;
  width: 538rem;
  height: 521rem;
}

.section .content .list {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26rem 42rem;
  margin-top: -58rem;
  padding: 0 68rem;
  z-index: 1;
}

.section .content .list .item {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 0 18rem 20rem 16rem;
  width: 409rem;
  height: 327rem;
}

.section .content .list .item::after {
  position: absolute;
  top: 0;
  left: 0;
  content: "";
  width: 100%;
  height: 100%;
  background: url(./images/video-frame.png) no-repeat;
  background-size: 100% 100%;
  pointer-events: none;
}

.section .content .list .item .bar {
  position: relative;
  display: flex;
  align-items: center;
  margin: 16rem auto;
  text-align: center;
  width: 72%;
  height: 40rem;
  font-size: 26rem;
  color: #ffffff;
  overflow: hidden;
}

.section .content .list .item .bar .name {
  position: relative;
  width: 100%;
  font-size: 26rem;
  color: #ffffff;
  white-space: nowrap;
  overflow: hidden;
  z-index: 1;
}

.section .content .list .item .video {
  position: relative;
  aspect-ratio: 375 / 236;
  width: 100%;
  background-color: #fff;
  border-radius: 8rem;
  cursor: pointer;
}

.section .content .list .item .video:hover .mask {
  background-color: #33333300;
}

.section .content .list .item .video .poster {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.section .content .list .item .video .mask {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #3333332f;
  z-index: 2;
  pointer-events: none;
  transition: all 0.3s;
}

.section .content .list .item .video .play {
  position: absolute;
  left: 50%;
  top: 50%;
  margin: -26rem 0 0 -26rem;
  width: 52rem;
  height: 52rem;
  background-color: #33333388;
  border-radius: 50%;
  z-index: 1;
}

.section .content .list .item .video .play::after {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-14%, -50%);
  content: "";
  width: 0;
  height: 0;
  border-top: 10rem solid transparent;
  border-right: 14rem solid transparent;
  border-left: 14rem solid #fff;
  border-bottom: 10rem solid transparent;
  z-index: 1;
}

.section .content .footer {
  margin: 29rem 0 43rem;
}

.president {
  padding-top: 360rem;
  background: url(./images/president-bg.jpg) no-repeat;
  background-size: 100% 100%;
  background-position: top center;
}

.director {
  padding-top: 200rem;
  background: url(./images/head-bg.jpg) no-repeat;
  background-size: 100% 100%;
  background-position: top center;
}

.teacher {
  padding-top: 200rem;
  background: url(./images/teacher-bg.jpg) no-repeat;
  background-size: 100% 100%;
  background-position: top center;
}

.ai-virtual {
  padding-top: 200rem;
  padding-bottom: 200rem;
  background: url(./images/ai-virtual-bg.jpg) no-repeat;
  background-size: 102% 100%;
  background-position: top center;
}

.director .content .header .inner .character {
  position: absolute;
  top: -30rem;
  left: 16rem;
  width: 333rem;
  height: 362rem;
}

.teacher .content .header .inner .character {
  position: absolute;
  top: -23rem;
  right: 44rem;
  width: 411rem;
  height: 424rem;
}

.ai-virtual .content .header .inner .character {
  position: absolute;
  top: -88rem;
  right: 0rem;
  width: 400rem;
  height: 469rem;
}

.couplet {
  width: 157rem;
}

footer.footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 168rem;
  background: #0a5bea;
}

.footer p {
  font-size: 20rem;
  color: #f8f8f8;
  text-align: center;
  margin-bottom: 10rem;
}
.footer p a {
  font-size: 20rem;
  color: #f8f8f8;
}
.footer p:last-child {
  margin-bottom: 0;
}

@media (max-width: 920px) {
  .logo {
    margin: 0 auto;
    width: 933rem;
    height: 96rem;
  }

  .president {
    padding-top: 640rem;
  }

  .note .content {
    padding: 63rem 48rem;
    text-indent: 2em;
    color: #d1feff;
    font-size: 54rem;
    box-shadow: inset 0 0 12px 8px rgb(109, 238, 248, 0.5);
    border: 2rem solid #6deef8;
    border-radius: 10rem;
  }

  .section .content .list {
    position: relative;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 26rem 42rem;
    margin-top: -58rem;
    padding: 0 68rem;
    z-index: 1;
  }

  .section .content .list .item {
    aspect-ratio: 409 / 327;
    width: calc(100% - 21rem);
    height: auto;
  }

  .section .content .list .item .bar {
    margin: calc(24rem * (409 / 327)) auto 0;
    height: calc(40rem * (409 / 327));
  }

  .section .content .list .item .name {
    font-size: calc(26rem * (409 / 327));
  }

  .section .content .list .item .video .play {
    width: calc(52rem * (409 / 327));
    height: calc(52rem * (409 / 327));
  }

  .section .content .list .item .video .play::after {
    content: "";
    border-top: calc(10rem * (409 / 327)) solid transparent;
    border-right: calc(14rem * (409 / 327)) solid transparent;
    border-left: calc(14rem * (409 / 327)) solid #fff;
    border-bottom: calc(10rem * (409 / 327)) solid transparent;
  }

  footer.footer .links {
    display: none;
  }

  footer.footer .copyright,
  footer.footer .mail {
    font-size: 28rem;
  }
}