.att-ck-classroom {
  height: auto;
  padding: 0;
  background: none;
}
.att-ck-classroom-header {
  height: 480px;
  margin-top: 70px;
  padding-top: 150px;
  text-align: left;
  background-image: url(https://download5.qingteng.cn/frontendcdn/www/assets/images/8de435de810d89bf8bf011e522a96346.png);
  background-repeat: no-repeat;
  background-position: center;
  background-size: auto 100%;
}
.att-ck-classroom-header .container {
  width: 1160px;
  margin: 0 auto;
  padding-right: 630px;
}
.att-ck-classroom-header .title {
  margin-bottom: 14px;
  padding-top: 0;
  text-align: left;
}
.att-ck-classroom-header h2 {
  color: #1a1a1a;
  font-weight: 500;
  font-size: 32px;
  line-height: 45px;
}
.att-ck-classroom-header p {
  margin-bottom: 28px;
  color: #414652;
  line-height: 24px;
}
.att-ck-classroom-header ul {
  width: 500px;
}
.att-ck-classroom-header ul li {
  display: inline-block;
  width: 238px;
  color: #414652;
  line-height: 24px;
}
.att-ck-classroom-header ul span {
  display: inline-block;
  width: 4px;
  height: 4px;
  margin: 0 5px;
  margin-bottom: 2px;
  background-color: #00a4c5;
  border-radius: 2px;
}
.att-ck-classroom-content {
  margin: 0 auto;
}
.att-ck-classroom-content .video-list {
  width: 1160px;
  margin: 0 auto;
}
.att-ck-classroom-content .video-list h2 {
  margin: 0 auto;
  color: #1a1a1a;
  font-weight: 500;
  font-size: 32px;
  line-height: 45px;
  text-align: center;
}
.att-ck-classroom-content .video-list h3 {
  margin-top: 14px;
  color: #666;
  line-height: 24px;
  text-align: center;
}
.att-ck-classroom-content .video-list h3 span {
  display: inline-block;
  text-align: left;
}
.att-ck-classroom-content .video-list-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  width: 1160px;
  margin-top: 60px;
}
.att-ck-classroom-content .video-list-content-item {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 270px;
  height: 210px;
  margin-bottom: 28px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 0 10px 0 #dcf0f5;
  cursor: pointer;
}
.att-ck-classroom-content .video-list-content-item:hover {
  box-shadow: 0 1px 12px 0 #c2c9cc;
}
.att-ck-classroom-content .video-list-content-item:hover .video-list-content-icon {
  width: 64px;
  height: 64px;
  background-image: url(https://download5.qingteng.cn/frontendcdn/www/assets/images/f7f5d5bfff1f34a73f43f041372e2117.png);
  transform: translate(-50%, -80%);
}
.att-ck-classroom-content .video-list-content-item:hover .video-list-content-pic {
  filter: none;
}
.att-ck-classroom-content .video-list-content-fill-item {
  background-color: #f9fafb;
  box-shadow: none;
}
.att-ck-classroom-content .video-list-content-fill-item:hover {
  box-shadow: none;
  cursor: default;
}
.att-ck-classroom-content .video-list-content-pic {
  width: 270px;
  height: 162px;
  border-top-left-radius: 8px;
  border-top-right-radius: 8px;
  filter: brightness(80%);
  transition: 0.3s;
}
.att-ck-classroom-content .video-list-content-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50px;
  height: 50px;
  background-image: url(https://download5.qingteng.cn/frontendcdn/www/assets/images/e22d75f9cbb91591067b24420073c2ab.png);
  background-size: 100% 100%;
  transform: translate(-50%, -90%);
}
.att-ck-classroom-content .video-list-content-title {
  flex: 1;
  padding: 0 10px;
  overflow: hidden;
  color: #666;
  font-weight: 500;
  font-size: 14px;
  line-height: 48px;
  white-space: nowrap;
  text-align: center;
  text-overflow: ellipsis;
  background-color: #fff;
  border-bottom-right-radius: 8px;
  border-bottom-left-radius: 8px;
}
.att-ck-classroom-content .video-list-btn {
  display: none;
  width: 178px;
  height: 50px;
  margin: 32px auto 0;
  color: #fff;
  font-size: 18px;
  background-color: #00a4c5;
  border: none;
  border-radius: 2px;
}
.att-ck-classroom-content .video-list-btn:hover {
  cursor: pointer;
}
.att-ck-classroom .att-ck-classroom-list-container {
  padding: 120px 0;
}
.att-ck-classroom .theory {
  background-color: #fff;
}
.att-ck-classroom .theory .video-list-content-fill-item {
  background-color: #fff;
}
.att-ck-classroom .application {
  background-color: #f9fafb;
}
.att-ck-classroom .fighting {
  background-color: #fff;
}
.att-ck-classroom .fighting .video-list-content-fill-item {
  background-color: #fff;
}
.att-ck-classroom .more {
  background-color: #f9fafb;
}