/* 底部白色 */
  .footer {
      background-color: #fff;
  }

  /* 大标题 */
  .title_video{
    margin-top: 80px;
    width: 90%;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .title_video h2{
    font-size: 64px;
    font-weight: 700;
    color: #000;
    text-align: center;
  }

  .title_video h2 span{
    color: #027AFF;
  }

  /* 课程内容 */
  .course_div_1{
    width: 90%;
    margin: 0 auto;
    height: 500px;
    border-radius: 15px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-top: 60px;
    box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.1);
    margin-bottom: 120px;
  }

  .course_div_1{
    background-image: url(../uploads/course/PEP/course/banner_bgi.png);
    background-size: cover;
    background-position: center;
  }

  .course_div_1 h2{
    font-size: 56px;  
    font-weight: 700;
    color: #000;
  }

  .course_div_1 p{
    font-size: 24px;
    color: #000;
  }

  .course_div_1 .baoming{
    margin-top: 30px;
  }

  @media screen and (max-width: 1068px) {
    .course_div_1,
    .course_div_2,
    .course_div_3{
      height: 400px;
      margin-top: 50px;
    }

    .title_video h2{
      font-size: 48px;
    }
    .course_div_1 h2{
      font-size: 40px;  
    }
    .course_div_1 p{
      font-size: 21px;
    }
  }

  @media screen and (max-width: 734px) {
    .course_div_1{
      height: 300px;
      margin-top: 40px;
    }
    
    .title_video h2{
      font-size: 32px;
    }
    .course_div_1 h2{
      font-size: 28px;  
    }

    .course_div_1 p{
      font-size: 17px;
    }
  }


  /* ------------------------产品单品---------------------- */
  /* 标题 */
.fubiaoti {
  margin-top: 80px;
  width: 90%;
}

.fubiaoti h2 {
  font-size: 56px;
  font-weight: 700;
  color: #000;
  text-align: center;
}

/* 内容 */
.past_video {
margin-top: 60px;
display: flex;
justify-content: flex-start;
align-content: flex-start;
flex-wrap: wrap;
min-height: 400px;
width: 90%;
}

.past_video a {
  width: calc(25% - 11.25px);
  margin-right: 15px;
  margin-bottom: 20px;
  text-decoration: none;
  background-color: #fff;
  border-radius: 15px;
  box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.1);
}

/* 统一处理右边距 */
.past_video a:nth-child(4n) {
  margin-right: 0;
}

/* @media (max-width: 1068px) {
  .past_video a {
      width: calc(33.333% - 10px);
  }
  
  .past_video a:nth-child(4n) {
      margin-right: 15px;  
  }
  
  .past_video a:nth-child(3n) {
      margin-right: 0;
  }
  .title_video h2 {
      font-size: 32px;
  }
} */

@media (max-width: 1068px) {
  .fubiaoti {
    margin-top: 100px;
  }

  .past_video {
    margin-top: 35px;
    }
  
  .past_video a {
    width: calc(50% - 7.5px);
  }
  
  .past_video a:nth-child(3n) {
      margin-right: 15px;
  }
  
  .past_video a:nth-child(2n) {
      margin-right: 0;
  }
  .fubiaoti h2 {
      font-size: 48px;
  }
}

@media (max-width: 734px) {
  .fubiaoti {
    margin-top: 80px;
  }
  
  .past_video {
    margin-top: 20px;
  }

  .past_video a {
      width: calc(100%);
  }
  
  .past_video a:nth-child(2n) {
      margin-right: 15px; 
  }
  
  .past_video a:nth-child(1n) {
      margin-right: 0;
  }
  .fubiaoti h2 {
      font-size: 32px;
  }

}

.past_video a img {
  width: 100%;
  border-radius: 15px 15px 0 0;
}

.past_video a h3{
  padding: 10px 15px 0 15px;
  font-size: 21px;
  font-weight: 700;
  color: #000;
}

.past_video a h4{
  padding: 5px 15px 0 15px;
  font-size: 14px;
  font-weight: 400;
  color: #999;
}

.past_video a h3:hover {
  color: #555;
  text-decoration: none;
}

.past_video a p{
  padding: 0 15px;
  color: #ff6b00;
  font-weight: 500;
  font-size: 21px;
}

.past_video a span{
  padding: 0;
  color: #999;
  text-decoration: line-through;
  font-weight: 400;
  font-size: 17px;
}


.past_video a span,
.past_video a p {
  display: inline-block;

  margin-top: 20px;
  margin-bottom: 20px;
}


/* 留白 */
.liubai {
  margin-top: 80px;
}

/* 734px隐藏大标题和课程1 */
@media (max-width: 734px) {
  .title_video {
    display: none;
  }
  .course_div_1 {
    display: none;
  }
}