.color-primary {
  color: #1871ff;
}
.color-gray-500 {
  color: #899099;
}
.title-underline {
  position: relative;
}
.title-underline::after {
  position: absolute;
  content: "";
  display: inline-block;
  bottom: 5px;
  left: 0;
  width: 33px;
  height: 5px;
  border-radius: 2.5px;
  z-index: -1;
  background: linear-gradient(to right, #1871ff, #fff);
}
.about-us .mui-bar {
  position: unset;
}
.about-us .container {
  padding: 12px 12px 100px 12px;
}
.about-us .top-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: -1;
  height: 265px;
  background: linear-gradient(0deg, #ffffff, #d1ebff);
}
.about-us .block {
  margin-bottom: 30px;
}
.about-us .block__title {
  margin-bottom: 12px;
  font-size: 14px;
  font-weight: 600;
  color: #202d40;
  line-height: 20px;
  position: relative;
}
.about-us .block__title::after {
  position: absolute;
  content: "";
  display: inline-block;
  bottom: 5px;
  left: 0;
  width: 33px;
  height: 5px;
  border-radius: 2.5px;
  z-index: -1;
  background: linear-gradient(to right, #1871ff, #fff);
}
.about-us .block__title::after {
  bottom: 1px;
}
.about-us .introduce .pic {
  height: 202px;
  margin-bottom: 16px;
}
.about-us .introduce .pic img {
  width: 100%;
  height: 100%;
  border-radius: 6px;
}
.about-us .introduce .content {
  text-indent: 2em;
  font-size: 14px;
  font-weight: 400;
  color: #626573;
  line-height: 24px;
}
.about-us .introduce .content .p {
  margin-bottom: 16px;
}
.about-us .base .video {
  display: flex;
  flex-wrap: wrap;
}
.about-us .base .video__item {
  position: relative;
  font-size: 0;
  flex: 0 0 calc(50% - 4px);
  margin-bottom: 16px;
}
.about-us .base .video__item:nth-child(odd) {
  margin-right: 7px;
}
.about-us .base .video__item .play {
  position: absolute;
  top: 31px;
  left: 50%;
  z-index: 10;
  width: 34px;
  height: 34px;
  transform: translateX(-50%);
}
.about-us .base .video__item .bg {
  width: 100%;
  height: 96px;
  margin-bottom: 10px;
}
.about-us .base .video__item .name {
  margin-left: 10px;
  font-size: 14px;
  color: #202d40;
  line-height: 20px;
}
.about-us .course .history__item {
  padding-left: 19px;
  margin-bottom: 14px;
  position: relative;
  font-size: 0;
}
.about-us .course .history__item:not(:last-child)::before {
  content: "";
  width: 1px;
  display: inline-block;
  position: absolute;
  top: 17px;
  left: 7px;
  bottom: -19px;
  z-index: -1;
  background-color: #cfd8e6;
}
.about-us .course .history__year {
  font-size: 16px;
  font-weight: 600;
  color: #1871ff;
  line-height: 22px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
}
.about-us .course .history__year::before {
  content: "";
  display: inline-block;
  width: 3px;
  height: 3px;
  background-color: #1871ff;
  border: 5px solid rgba(24, 113, 255, 0.2);
  background-clip: padding-box;
  border-radius: 100px;
  margin-left: -18px;
  margin-right: 8.5px;
}
.about-us .course .history__info {
  padding: 12px;
  border: 1px solid #e6e9f0;
  border-radius: 8px;
  display: flex;
  align-items: flex-start;
}
.about-us .course .history__pic {
  flex: 0 0 78px;
  height: 52px;
  margin-right: 12px;
}
.about-us .course .history__event {
  flex: 1;
}
.about-us .course .history .event__item {
  display: flex;
  align-items: flex-start;
  font-size: 12px;
  color: #202d40;
  line-height: 17px;
}
.about-us .course .history .event__item::before {
  content: "";
  flex: 0 0 3px;
  height: 3px;
  margin-top: 7px;
  display: inline-block;
  background: #1871ff;
  border-radius: 50%;
  margin-right: 8px;
}