/* 小于750px 手机*/
@media (max-width: 750px) {
  .m_nav_content {
    font-size: 0.14rem;
  }
  .m_nav_content span {
    color: #254a98;
  }
  .m_nav_content .select {
    width: 1.3rem;
  }
  .m_nav_content .select .el-input__inner {
    height: 0.36rem;
    line-height: 0.36rem;
  }
  .main_section_contain {
    width: 100%;
  }
  .main_section_contain .top_content {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
  }
  .main_section_contain .book_item {
    cursor: pointer;
    margin-bottom: 0.3rem;
  }
  .main_section_contain .book_item .img_item {
    width: 100%;
    position: relative;
    overflow: hidden;
  }
  .main_section_contain .book_item .img_item img {
    width: 100%;
    height: 100%;
    display: block;
    transition: 0.3s linear;
    -webkit-transition: 0.3s linear;
    -o-transition: 0.3s linear;
    -moz-transition: 0.3s linear;
  }
  .main_section_contain .book_item .img_item span {
    font-size: 0.14rem;
    width: 100%;
    display: block;
    text-align: center;
    position: absolute;
    bottom: 0.2rem;
    left: 0;
    color: #fff;
  }
  .main_section_contain .book_item .btn_item {
    display: flex;
    justify-content: center;
    margin-top: 0.2rem;
    font-size: 0.14rem;
  }
  .main_section_contain .book_item .btn_item span {
    display: block;
    width: 1rem;
    height: 0.36rem;
    line-height: 0.36rem;
    text-align: center;
    border: solid 2px #8b6825;
    color: #8b6825;
    border-radius: 0.36rem;
    cursor: pointer;
  }
  .main_section_contain .book_item .btn_item span:first-child {
    margin-right: 0.2rem;
  }
  .main_section_contain .book_item .btn_item span:hover {
    background-color: #8b6825;
    color: #fff;
  }
  .main_section_contain .book_item:last-child {
    margin-bottom: 0;
  }
  .main_section_contain .book_item:hover .img_item img {
    transform: scale(1.03, 1.03);
    -moz-transform: scale(1.03, 1.03);
    -webkit-transform: scale(1.03, 1.03);
  }
}
@media (min-width: 750px) {
  /*  PC */
  .main_section_contain {
    width: 100%;
    border-top: 1px solid #e5e5e5;
    font-size: 18px;
  }
  .main_section_contain .mian_top_title .select {
    display: none;
  }
  .main_section_contain .top_content {
    display: flex;
    flex-wrap: wrap;
  }
  .main_section_contain .top_content .book_item {
    margin-right: 6px;
    margin-bottom: 50px;
  }
  .main_section_contain .top_content .book_item .img_item {
    width: 420px;
    height: 490px;
    position: relative;
    overflow: hidden;
  }
  .main_section_contain .top_content .book_item .img_item img {
    width: 100%;
    height: 100%;
    display: block;
    transition: 0.3s linear;
    -webkit-transition: 0.3s linear;
    -o-transition: 0.3s linear;
    -moz-transition: 0.3s linear;
  }
  .main_section_contain .top_content .book_item .img_item span {
    width: 100%;
    display: block;
    text-align: center;
    position: absolute;
    bottom: 20px;
    left: 0;
    color: #fff;
    font-size: 20px;
    padding: 0 10px;
    box-sizing: border-box;
  }
  .main_section_contain .top_content .book_item .btn_item {
    display: flex;
    justify-content: center;
    margin-top: 30px;
    font-size: 20px;
  }
  .main_section_contain .top_content .book_item .btn_item span {
    display: block;
    width: 150px;
    height: 50px;
    line-height: 50px;
    text-align: center;
    border: solid 2px #8b6825;
    color: #8b6825;
    border-radius: 50px;
    cursor: pointer;
  }
  .main_section_contain .top_content .book_item .btn_item span:first-child {
    margin-right: 30px;
  }
  .main_section_contain .top_content .book_item .btn_item span:hover {
    background-color: #8b6825;
    color: #fff;
  }
  .main_section_contain .top_content .book_item:nth-child(3n) {
    margin-right: 0;
  }
  .main_section_contain .top_content .book_item:hover .img_item img {
    transform: scale(1.03, 1.03);
    -moz-transform: scale(1.03, 1.03);
    -webkit-transform: scale(1.03, 1.03);
  }
}