.color-primary {
  color: #1175fe;
}
.color-white {
  color: #FFF;
}
.text-base {
  color: #333;
}
.back-primary {
  background-color: #1175fe;
}
.back-disabled {
  background-color: #D4D4D4;
}
.back-white {
  background-color: #FFF;
}
.back-line-gradient {
  color: #FFF;
  background-image: linear-gradient(to right, #96cdfa, #1175fe);
}
/* keyFrames */
@keyframes animloader {
  0% {
    height: 30px;
  }
  100% {
    height: 4.8px;
  }
}
.study {
  height: 100vh;
  background-color: #f1f2f3;
}
.study .van-nav-bar {
  background-color: transparent !important;
}
.study .van-nav-bar .van-icon {
  color: #FFF;
}
.study > div {
  width: 100%;
}
.study .cc_player {
  height: 210px;
  background-color: #000;
}
.study .cc_player.fixed {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
}
.study > .main {
  height: calc(100% - 210px);
}
.study > .main > .title {
  align-items: center;
  padding: 9px;
}
.study > .main > .title .text-base {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 17px;
}
.study > .main > .title .title_icon {
  width: 5px;
  height: 21px;
  border-radius: 6px;
  margin-right: 9px;
}
.study > .main > .title .title_button {
  width: 78px;
  height: 35px;
  line-height: 35px;
  margin-left: 10px;
  border: none;
  border-radius: 20px;
}
.study > .main > .content {
  display: flex;
  padding-top: 5px;
  height: calc(100% - 53px);
}
.study > .main > .content > .sidebar {
  flex: 0 0 100px;
  padding: 9px;
  overflow: auto;
}
.study > .main > .content > .sidebar > .item {
  font-size: 14px;
  display: flex;
  padding: 9px 0;
  align-items: center;
}
.study > .main > .content > .sidebar > .item > img {
  margin-right: 9px;
}
.study > .main > .content > .list {
  flex: auto;
  margin: 0 10px;
  overflow-y: auto;
}
.study > .main > .content > .list > .item {
  padding: 0 12px;
  border-radius: 8px;
  box-shadow: 0px 2px 10px 0px rgba(0, 0, 0, 0.13);
  margin-bottom: 13px;
}
.study > .main > .content > .list > .item > .title {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: bold;
  text-align: center;
  padding: 19px 19px 8px;
}
.study > .main > .content > .list > .item > .title > span {
  padding: 0 10px;
}
.study > .main > .content > .list > .item > .second_title {
  position: relative;
  margin: 0;
  padding: 10px 0;
  font-size: 14px;
  font-weight: bold;
}
.study > .main > .content > .list > .item > .second_title::before {
  content: '';
  display: inline-block;
  vertical-align: text-bottom;
  width: 4px;
  height: 15px;
  margin-right: 5px;
  border-radius: 2px;
  background-color: #1175fe;
}
.study > .main > .content > .list > .item > .section_list {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  padding-bottom: 30px;
  overflow: hidden;
}
.study > .main > .content > .list > .item > .section_list.limit_height {
  max-height: 228px;
}
.study > .main > .content > .list > .item > .section_list > .section_item {
  width: 48%;
  position: relative;
}
.study > .main > .content > .list > .item > .section_list > .section_item:nth-of-type(odd) {
  margin-right: 4%;
}
.study > .main > .content > .list > .item > .section_list > .section_item > .info {
  height: 72px;
  background-size: cover;
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}
.study > .main > .content > .list > .item > .section_list > .section_item > .info.disabled:before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  background-color: rgba(0, 0, 0, 0.5);
  width: 100%;
  height: 100%;
  z-index: 2;
}
.study > .main > .content > .list > .item > .section_list > .section_item > .info .info_status {
  position: absolute;
  top: 4px;
  left: 0;
  border-top-right-radius: 20px;
  border-bottom-right-radius: 20px;
  font-size: 8px;
  padding: 0 6px;
}
.study > .main > .content > .list > .item > .section_list > .section_item > .info .info_name {
  position: absolute;
  top: 42%;
  left: 50%;
  width: 100px;
  transform: translate(-50%, -50%);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 10px;
  padding: 2px 4px;
  text-align: center;
  border-radius: 20px;
}
.study > .main > .content > .list > .item > .section_list > .section_item > .info .info_duration {
  position: absolute;
  right: 5px;
  bottom: 5px;
  font-size: 12px;
}
.study > .main > .content > .list > .item > .section_list > .section_item > .info .info_play {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
}
.study > .main > .content > .list > .item > .section_list > .section_item > .info .info_play .playing {
  width: 4px;
  height: 30px;
  border-radius: 4px;
  display: inline-block;
  position: relative;
  background: currentColor;
  color: #FFF;
  animation: animloader 0.3s 0.3s linear infinite alternate;
}
.study > .main > .content > .list > .item > .section_list > .section_item > .info .info_play .playing::after,
.study > .main > .content > .list > .item > .section_list > .section_item > .info .info_play .playing::before {
  content: "";
  width: 4px;
  height: 30px;
  border-radius: 4px;
  background: currentColor;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  left: 10px;
  animation: animloader 0.3s 0.45s linear infinite alternate;
}
.study > .main > .content > .list > .item > .section_list > .section_item > .info .info_play .playing::before {
  left: -10px;
  animation-delay: 0s;
}
.study > .main > .content > .list > .item > .section_list > .section_item > .item_title {
  padding: 4px 5px;
  margin: 0;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.study > .main > .content > .list > .item > .section_list > .section_button {
  width: 100%;
  position: absolute;
  bottom: 0;
  text-align: center;
  line-height: 30px;
  font-size: 10px;
  left: 50%;
  transform: translateX(-50%);
  padding: 0 20px;
  text-decoration: underline;
  z-index: 2;
}
.study > .main > .content > .list > .item > .item_exam {
  width: 100%;
  margin-bottom: 13px;
}
.study > .main > .content > .list > .item > .item_exam > img {
  width: 100%;
}