.page {
  min-height: 100vh;
  font-family: "微软雅黑";
}
.banner {
  background-image: url("/material/images/banner_.jpg");
  background-size: 100% 100%;
  width: 100%;
  aspect-ratio: 1920 / 1860;
  padding-top: 55.75rem;
  box-sizing: border-box;
}

.introduction {
  position: relative;
  z-index: 1;
  background-image: url("/material/images/dy-bg.png");
  background-size: 100% 100%;
  width: 81.6875rem;
  height: 11.25rem;
  padding: 3rem 1rem 1rem 21rem;
  text-indent: 2em;
  box-sizing: border-box;
  margin: 0 auto;
  color: #fff;
  line-height:1.8rem;
}

.ellipsis {
  overflow: hidden;
  text-overflow: ellipsis;
  -webkit-line-clamp: 1;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  white-space: normal;
}
.video {
  position: relative;
  background:#000;
}
.video video {
  width: 100%;
  height: 100%;
}

.video .button {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 90%;
  cursor: pointer;
}
.video .button img{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 5.375rem;
  height: 5.375rem;
  pointer-events: none;
}