body {
  background: url(/expert/web/static/history/background_v.jpg) repeat-y center top;
  background-size: 100% 100%;
}
.web-footer {
  background: none !important;
}
.ball {
  position: absolute;
  background-color: rgba(154, 51, 18, 0.5);
  border-radius: 100%;
  width: 34rem;
  height: 34rem;
  display: none;
  bottom: -34rem;
  left: 50%;
  transform: translate(-50%, 0);
}
.ball::after {
  border-radius: 100%;
  position: absolute;
  content: ' ';
  width: 14rem;
  height: 14rem;
  background-color: #9a3312;
  left: 10rem;
  bottom: 10rem;
}
.topic-banner {
  width: 100%;
  height: 100vh;
  position: relative;
}
.topic-banner .image {
  width: 100%;
  height: 100vh;
  display: block;
  position: relative;
  z-index: -1;
  background-size: 100%  100%;
  background-repeat: repeat-x;
  background-position: center bottom;
}
.topic-banner .image img {
  object-fit: cover;
  height: 100%;
  width: 100%;
}
.topic-banner .dashed_up,
.topic-banner .dashed_down {
  width: 2rem;
  background: url(/expert/web/icon/dashed-v.png) repeat-y center top;
  background-size: 1rem 10rem;
  height: 0rem;
  margin: 0 auto;
  position: relative;
}
.topic-banner .title,
.topic-banner .title-main {
  width: 130rem;
}
.topic-banner .title {
  background-color: rgba(154, 51, 18, 0.9);
  margin: 0 auto;
  height: 0;
  overflow: hidden;
}
.topic-banner .title-main {
  height: 380rem;
  box-sizing: border-box;
  padding-top: 30rem;
}
.topic-banner .title h2 {
  width: 47rem;
  font-size: 48rem;
  color: #fffaeb;
  text-align: center;
  height: 212rem;
  line-height: 53rem;
  margin: 0 auto;
}
.topic-banner .title .icon {
  width: 48rem;
  height: 100rem;
  position: relative;
  margin: 8rem auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.topic-banner .title .icon img {
  display: block;
  text-align: center;
  position: absolute;
}
.topic-banner .title .icon img:nth-child(1) {
  width: 21rem;
  height: 21rem;
  top: 0;
}
.topic-banner .title .icon img:nth-child(2) {
  width: 1rem;
  height: 50rem;
  top: 21rem;
}
.topic-banner .title .icon img:nth-child(3) {
  width: 48rem;
  position: absolute;
  bottom: 0;
  animation: hookTranslateX 1s ease-in-out 3s 3 forwards;
}
.topic-banner .subTitle {
  position: absolute;
  left: 360rem;
  bottom: 105rem;
  opacity: 0;
}
.topic-banner .subTitle h3 {
  font-family: Fz;
  font-size: 24rem;
  color: #9a3312;
  margin-bottom: 8rem;
}
.topic-banner .subTitle p {
  font-size: 16rem;
  color: #5e4a23;
  line-height: 28rem;
  font-family: PingFangSC-Regular;
}
.topic-banner .content {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}
.topic-banner .content.show .dashed_up {
  height: calc(50vh - 190rem);
  transition: 0.5s linear;
}
.topic-banner .content.show .title {
  transition: 1s linear 0.5s;
  height: 380rem;
}
.topic-banner .content.show .dashed_down {
  height: calc(50vh - 190rem);
  transition: height 0.5s linear 1.5s;
}
.topic-banner .content.show .dashed_down .ball {
  opacity: 1;
}
.topic-banner .content.show .anchor {
  animation: hookTranslateX 0.6s ease-in-out 2s 3 forwards;
}
.topic-banner .content.show .subTitle {
  opacity: 1;
  transition: 0.5s ease 1.6s;
}
@keyframes hookTranslateX {
  0% {
    bottom: 0;
  }
  50% {
    bottom: -6rem;
  }
  100% {
    bottom: 0;
  }
}