main {
  padding: 40px 10px;
  box-sizing: border-box;
  background-color: #fff;
  margin-bottom: 10px;
}

.course-header {
  display: flex;
  align-items: stretch;
}

.course-header > img:first-child {
  width: 430px;
  height: 240px;
  margin-right: 45px;
}

.course-header-infos {
  padding: 16px 0;
  box-sizing: border-box;
}

.course-header-infos h1 {
  font-size: 20px;
}

.course-header-infos > div {
  margin-top: 10px;
}

.course-price > span:first-child {
  color: #E70012;
  font-size: 12px;
  font-weight: bold;
}

.course-price > span:first-child strong {
  font-size: 30px;
}

.course-price .activity {
  display: inline-block;
  width: 80px;
  height: 26px;
  background-color: #FFF3F4;
  border-radius: 10px;
  font-size: 14px;
  color: #E70012;
  line-height: 26px;
  text-align: center;
  transform: translateY(-6px);
}

.course-info {
  font-size: 14px;
  color: #999;
}

.course-info > span {
  margin-right: 20px;
}

.course-info span span {
  color: #333;
}

.course-header .course-btns {
  width: 480px;
  height: 50px;
  display: flex;
  border-radius: 10px;
  overflow: hidden;
  margin-top: 50px;
}

.course-btns button {
  flex: 1;
  height: 100%;
  color: #fff;
  font-weight: bold;
  font-size: 16px;
  cursor: pointer;
  background-color: #E70012;
  position: relative;
}

.course-btns button::after {
  content: "上岸率+10%";
  font-size: 12px;
  width: 86px;
  height: 20px;
  line-height: 22px;
  color: #E70012;
  text-indent: 10px;
  transform: scale(0.9);
  background-color: #FEE6E8;
  border-radius: 0px 0px 0px 18px;
  position: absolute;
  right: -5px;
  top: -2px;
}

.course-btns button:last-child::after {
  content: "上岸率+80%";
  color: #FF7A32;
  background-color: #FFEFE6;
}

.course-btns button:last-child {
  background-color: #FF7A32;
}

.course-video {
  margin-top: 30px;
}

.course-video h2 {
  height: 42px;
  display: flex;
  align-items: center;
  font-size: 18px;
  border-bottom: 1px solid #E9E9E9;
}

.course-video h2 span {
  position: relative;
}

.course-video h2 span::after {
  content: '';
  width: 100%;
  height: 3px;
  position: absolute;
  left: 0;
  bottom: -10px;
  background-color: #E70012;
}

.course-video-list {
  margin-top: 24px;
}

.course-video-list li {
  display: flex;
  align-items: center;
}

.course-video-list li + li {
  margin-top: 30px;
}

.course-video-list li:nth-child(n+3) {
  cursor: default;
}

.course-video-list li:nth-child(n+3) a:hover {
  text-decoration: none;
}

.course-video-list li > div {
  width: 27px;
  height: 27px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 10px;
}

.course-video-list li > div img {
  max-width: 100%;
  max-height: 100%;
}