.book_show{
    width: 100%;
    height: 300px;
    display: flex;
    justify-content: space-between;
}
.book_show_left{
    width: 254px;
    height: 100%;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    border-radius: 5px;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    align-items: center;
    padding: 15px 0; 
}
.book_show_left_cover{
    width: 144px;
    height: 209px;
    background-size: cover;
    box-shadow: 3px 3px 5px rgba(0,0,0,0.3);
}
.book_show_left_title{
    font-weight: bold;
    width: 80%;
    height: 40px;
    text-align: center;
    line-height: 40px;
    overflow: hidden;
}  
.book_show_left_title:hover{
    color: #454545;
} 
.book_show_left_cover img{
    width: 100%;
    height: 100%;
}
.book_show_right{
    width: 930px;
    height: 100%;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    background-color: #fff;
    border-radius: 5px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}
.book_show_right .tip{
    font-size: 28px;
    color: #fff;
    text-align: center;
    margin-bottom: 20px;
    letter-spacing: 2px;
}
.book_show_right .tip2{
    font-size: 25px;
    /* text-decoration: underline; */
    color: #fff;
    text-align: center;
    letter-spacing: 2px;
    color: #E4E4E4;
    font-family: 'Source Han Sans CN';
    width: 196px;
}
.book_show_right .tip2::after{
    content: '';
    width: 100%;
    height: 1px;
    display: block;
    background-color: #E4E4E4;
    position: relative;
    bottom: -3px;
}
.book_intro_basic,
.book_intro_desc{
    height: 340px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.book_intro_basic{
    width: 870px;
    display: flex;
    align-items: center;
    padding: 0 15px;
    background-color: #fff;
}
._intro_basic_cover{
    width: 212px;
    height: 307px;
    box-shadow: 3px 3px 5px rgba(0,0,0,0.3);
}
._intro_basic_cover img{
    height: 100%;
    width: 100%;
}
._intro_basic_ctet{
    height: 307px;
    width: 520px; 
    /* background-color: red; */
    margin-left: 25px;
}
._intro_basic_ctet p{
    line-height: 30px;
}
._intro_basic_ctet p{
    font-size: 16px;

}
._intro_basic_ctet p:hover{
    color: unset;
}
._intro_basic_ctet .title{
    font-size: 24px;
    line-height: 60px;
    font-weight: bold;
}
._intro_basic_ctet .label{
    font-weight: bold;
}
._intro_basic_ctet .btns{
    margin-top: 15px;
}
._intro_basic_ctet .btns>*{
    display: inline-block;
    width: 116px;
    height: 36px;
    text-align: center;
    line-height: 32px;
    border-radius: 4px;
    font-weight: bold;
    font-size: 15px;
    box-shadow: 3px 3px 5px rgba(0,0,0,0.2);
    user-select: none;
}
._intro_basic_ctet .btns>*:first-child{
    background-color: var(--primary-color);
    border: 2px solid var(--primary-color);
    color: #fff;
    margin-right: 25px;
}
._intro_basic_ctet .btns>*:first-child:hover{
    background-color: var( --primary-color-hover);
    border: 2px solid var(--primary-color-hover);
}
._intro_basic_ctet .btns>*:first-child:active{
    background-color: var( --primary-color-active);
    border: 2px solid var(--primary-color-active);
}
._intro_basic_ctet .btns>*:last-child{
    border: 2px solid var(--primary-color);
    background-color: #fff;
    color: #454545;
    margin-right: 25px;
}
._intro_basic_ctet .btns>*:last-child:hover{
    background-color:  var( --primary-color);
    border: 2px solid var(--primary-color);
    color: #fff;
}
._intro_basic_ctet .btns>*:last-child:active{
    border: 2px solid var(--primary-color-active);
    background-color:  var( --primary-color-active);
    color: #fff;
}
.book_intro_desc{
    width: 100%;
    background-color: #fff;
    padding: 15px;
}
.book_intro_desc .title{
    font-weight: bold;
    margin-top: 5px;
    margin-bottom: 10px;
    font-size: 19px;
}
.book_intro_desc ._intro_desc_ctet{
    font-size: 16px;
    color: #767171;
     word-break: break-all;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 11;
    -webkit-box-orient: vertical;
}
.book_list{
    width: 100%;
    display: flex;
    justify-content: space-between;
    margin-top: 18px;
}
.book_list_ctet>div,
._list_side_book{
    border-radius: 5px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.book_list_ctet{
    width: 870px;
}

.book_list_ctet>div:not(:last-child){
    margin-bottom: 18px;
}
.book_list_side{
    width: 310px;
}
.book_list_side>div:not(:last-child){
    margin-bottom: 18px;
}
.book_list_ctet h1{
    font-weight: bold;
    font-size: 22px;
    height: 67px;
    width: 100%;
    padding-top: 20px;
    padding-left: 30px;
}
.book_list_ul{
    max-height: 766px;
    overflow-y: auto;
}
.book_list_ul li{
    height: 50px;
    padding-left: 55px;
    line-height: 50px;
    position: relative;
    display: flex;
    justify-content: flex-start;
}
.book_list_ul li::before{
    content: '';
    width: 6px;
    height: 6px;
    display: block;
    position: absolute;
    border-radius: 50%;
    background-color: #000;
    top: calc(50% - 3px);
    left: 30px;
}
.book_list_ul li:nth-child(odd){
    background-color: #F9F9F9;
}
.book_list_ul li>a:first-child{
    display: block;
    min-width: 84%;
    max-width: 84%;
    color: #333333;
}
.book_list_ul li>a:last-child{
    display: block;
    text-align: left;
    color: #676767;
    padding-left: 6px;
}
.book_list_ul li>a:hover{
    color: var(--primary-color);
}
._list_side_book{
    display: flex;
    justify-content: flex-start;
    height: 254px;
    align-items: center;
    padding: 0 15px;
}
._list_side_book_cover{
    width: 142px;
    height: 206px;
    position: relative;
    top: 2px;
}
._list_side_book_cover img{
    width: 100%;
    height: 100%;
}
._list_side_book_info{
    width: 120px;
    height: 206px;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    padding: 15px 0;
    margin-left: 13px;
}
._list_side_book_info .title{
    font-weight: bold;
    font-size: 18px;
}
._list_side_book_info .author{
    font-weight: bold;
    font-size: 15px;
}
._list_side_book_info .hot{
    height: 36px;
    font-size: 19px;
    line-height: 36px;
    background-color: #D81E06;
    border-radius: 30px;
    text-align: center;
    color: #fff;
    letter-spacing: 2px;
}
._list_side_book_info .price{
    font-weight: bold;
    font-size: 21px;
    color: #D81E06;
}
.contact_form{
    border-radius: 5px;
    box-shadow: 3px 3px 5px rgba(0,0,0,0.15);
    height: 531px;
}
.bltopt_title>div:nth-child(1) a{
    color: #3C3C3C;
    font-weight: normal;
}
.course{
    border-radius: 5px !important;  
    box-shadow: 3px 3px 5px rgba(0,0,0,0.15);
    height: 296px;
}
.course_ctet{
    display: flex;
    flex-direction: column;
    /* justify-content: space-between; */
}
.course_ctet>.course_item{
    height: 72px;
    display: flex;
    margin-bottom: 11px;
}
.course_ctet>.course_item:last-child{
    margin-bottom: 0;
}
.course_item .course_item_cover{
    width: 128px;
    height: 100%;
    overflow: hidden;
    border-radius: 5px;
    position: relative;
}
.course_item .course_item_cover .play_btn{
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 30px;
    height: 30px;
}
.course_item .course_item_cover .play_btn i{
    font-size: 26px;
}
.course_item_info{
    font-size: 14px;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding-top: 2px;
    padding-bottom: 1px;
    padding-left: 5px;
}
.course_item_info div{
    text-overflow: -o-ellipsis-lastline;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    position: relative;
    top: 32%;
    transform: translateY(-50%);
}
.course_item_info div:hover{
    color: var(--primary-color);
}

.course_item_info p{
    color: #7B8493;
}

.tr_side{
    width: 100% !important;
    height: 305px !important;
    border-radius: 5px !important;
    box-shadow: 3px 3px 5px rgba(0,0,0,0.15);
}