.bt_head{position: fixed;top: 0;left: 0;right: 0;z-index: 100;}
.bt_head_c{height: 92px;display: flex;justify-content: space-between;align-items: center;}

.bt_head_l{display: flex;align-items: center;}
.bt_head_l>a>img{}

.bt_head_r{display: flex;justify-content: space-between;margin-left: 40px;position: relative;}
.bt_head_r>b{position: absolute;left: 0;bottom: -1px;display: block;border-top: 4px solid #fff;width: 116px;transition: .3s;}
.bt_head_i{position: relative;text-align: center;flex: 1;padding: 0 26px;}
.bt_head_i>a{display: inline-block;line-height: 90px;transition: .3s;color: #fff;font-size: 16px;vertical-align: middle;white-space: nowrap;}
.bt_head_i>a>img{margin-right: 10px;padding-bottom: 4px;}
.bt_head_a{}
.bt_head_a>a{font-weight: bold;}

.bt_head_menu{margin-left: 50px;cursor: pointer;}

.bt_head_color{background-color: rgba(10, 33, 48, 0.93);}


/* .bt_head_mr{position: relative;}
.bt_head_mr>img{padding: 20px 0 20px 60px;}
.bt_head_sear{padding: 20px 50px 30px;width: 316px;position: absolute;display: none;top: 100%;right: 0;width: auto;background-color: #fff;border-radius: 15px;box-shadow: 0 0 10px 0 #eee;}
.bt_head_se{border-bottom: 1px solid #eee;display: flex;justify-content: space-between;align-items: center;}
.bt_head_se>select{background-color: var(--base);color: #fff;height: 30px;padding: 0 5px;margin-right: 15px;border-radius: 5px;}
.bt_head_se>input{height: 50px;color: #333;}
.bt_head_se>img{cursor: pointer;} */

/* .bt_head_ex{position: absolute;top: 100%;left: 50%;transform: translateX(-50%);z-index: 2;display: none;overflow: hidden;box-shadow: 2px 2px 6px 1px #eee;border-radius: 10px;;}
.bt_head_exc{background-color: #fff;}
.bt_head_exc>a{color: #666;font-size: 13px;display: block;text-align: center;height: 40px;line-height: 40px;transition: .3s;padding: 0 30px;white-space: nowrap;}
.bt_head_exc>a:hover{background-color: var(--base);color: #fff;} */

/* .bt_head_over{position: absolute;left: 0;top: 100%;right: 0;z-index: 2;background-color: #f9f9f9;overflow: hidden;box-shadow: 0 1px 12px 1px #eee;width: 100%;text-align: left;}
.bt_head_oc{display: flex;flex-wrap: wrap;align-items: flex-start;padding: 40px 0;}
.bt_over_oi{display: none;}
.bt_head_oc>h1{padding-left: 20px;border-left: 3px solid var(--base);font-size: 24px;color: var(--base);margin-right: 40px;}
.bt_head_oc>h1>p{font-size: 14px;color: #666;margin-top: 6px;}
.bt_head_oii{text-align: center;width: 180px;margin-right: 20px;}
.bt_head_oii>img{width: 100%;}
.bt_head_oii>h1{font-size: 14px;background-color: var(--base);color: #fff;height: 40px;line-height: 40px;} */
/* .bt_head_oii:hover h1{color: var(--base);} */

.bt_foot{background-color: #0a2130;color: #fff;}
.bt_foot_t{height: 90px;}
.bt_foot_tc{display: flex;justify-content: space-between;align-items: center;height: 100%;}
.bt_foot_tl{display: flex;}
.bt_foot_tl>a{padding: 0 20px;border-left: 1px solid #fff;line-height: 1;}
.bt_foot_tl>a:first-child{padding-left: 0;border-left: 0;}
.bt_foot_tr{display: flex;justify-content: space-between;background: url('/images/hf/10.png') no-repeat center;background-size: 100%;}
.bt_foot_tr>a{width: 42px;height: 42px;}

.bt_foot_mc{border-top: 1px solid #364955;border-bottom: 1px solid #364955;padding: 50px 0;display: flex;justify-content: space-between;}
.bt_foot_mi>img{margin-right: 20px;}


.bt_foot_b{}
.bt_foot_bc{padding: 20px 0;color: #eee;display: flex;justify-content: space-between;}
.bt_foot_bc>p{}

/* .bt_title{text-align: center;padding: 30px 0;}
.bt_title>h1{font-size: 30px;font-weight: 600;}
.bt_title>h1>span{color: var(--base);}
.bt_title>span{display: inline-block;width: 65px;height: 5px;background-color: var(--base);margin-top: 30px;}
.bt_title>p{font-size: 16px;margin-top: 20px;} */

/* .bt_top{display: flex;justify-content: space-between;align-items: center;margin-top: 60px;padding-bottom: 20px;border-bottom: 2px solid #dedede;}
.bt_top_l{}
.bt_top_l>span{width: 20px;height: 60px;background-color: var(--base);float: left;margin-right: 20px;margin-top: 10px;}
.bt_top_l>h1{font-size: 30px;font-weight: bold;color: var(--base);white-space: nowrap;}
.bt_top_l>p{font-size: 18px;font-weight: bold;line-height: 2;} */

.bt_cate{background-color: #f6f6f6;}
.bt_cate_c{display: flex;width: var(--lg);margin: 0 auto;justify-content: center;align-items: center;height: 70px;gap: 20px;}
.bt_cate_i{transition: .3s;cursor: pointer;text-align: center;width: 140px;border-radius: 20px;overflow: hidden;}
.bt_cate_i>a{color: #333;transition: .3s;line-height: 40px;display: block;background-color: #dddddd;}
.bt_cate_i:hover{background-color: var(--base);}
.bt_cate_i:hover>a{color: #fff;}
.bt_cate_a{background-color: var(--base);}
.bt_cate_a>a{color: #fff;background-color: var(--base);}

.bt_nav{background-color: #f7f7f7;}
.bt_nav_c{height: 70px;display: flex;align-items: center;width: var(--lg);margin: 0 auto;}
.bt_nav_c>img{margin-right: 10px;height: 20px;}
.bt_nav_c>a{}
.bt_nav_c>span{margin: 0 10px;font-family: monospace,serif;color: #999;}
.bt_nav_a{color: var(--base);font-weight: bold;}

/* .bt_bk{background: url('/images/11.jpg') no-repeat bottom;background-size: auto 250px;padding-bottom: 270px;} */

.bt_banner{position: relative;overflow: hidden;}
.bt_banner>img{width: 100%;animation: sc 6s linear infinite;}
.bt_banner_w{position: absolute;left: 0;top: 0;width: 100%;height: 100%;display: flex;justify-content: center;align-items: center;flex-direction: column;color: #fff;}
.bt_banner_w>h1{font-size: 34px;font-weight: 600;}
.bt_banner_w>p{font-size: 16px;margin-top: 10px;}

@keyframes sc {
    0%{transform: scale(1);}
    50%{transform: scale(1.1);}
    100%{transform: scale(1);}
}

.bt_nv{margin-top: 60px;width: 100%;padding: 0 0 60px;}
.bt_nv_c{display: flex;justify-content: space-between;align-items: center;gap: 40px;}
.bt_nv_c>a{overflow: hidden;text-overflow: ellipsis;white-space: nowrap;display: block;line-height: 2;}
.bt_nv_c>a:hover{color: var(--base);}

.bt_aside{position: fixed;right: 20px;top: 40vh;z-index: 10;border-radius: 10px;padding: 10px 0;background-color: #fff;box-shadow: 0 0px 10px 0px #efefef;}
.bt_aside_i{position: relative;cursor: pointer;transition: .3s;display: flex;flex-direction: column;justify-content: center;align-items: center;padding: 14px 20px;}
/* [totop]{height: 0;transition: .3s;} */
.bt_aside_i>img{}
.bt_aside_i>img:nth-child(2){display: none;}
/* .bt_aside_i>span{color: #fff;}    */
.bt_aside_i:hover>img:first-child{display: none;}
.bt_aside_i:hover>img:nth-child(2){display: inline;}
.bt_aside_r{position: absolute;right: calc(100% + 10px);top: 0;display: none;width: 206px;padding: 12px;color: var(--base);box-shadow: 0 0 10px -3px #ddd;text-align: center;font-size: 15px;font-weight: bold;}
.bt_aside_r>img{width: 100%;}
/* .bt_aside_i:hover{background-color: #218ac6;} */
.bt_aside_i:hover >.bt_aside_r{display: block;}

/* .bt_out{padding: 1px 0;background-color: #f7f7f7;}
.bt_cont{display: flex;justify-content: space-between;margin: 30px auto ;width: var(--lg);}
.bt_left{width: 18%;background-color: #fff;overflow: hidden;}
.bt_left_t{padding: 22px 26px;background-color: var(--base);color: #fff;}
.bt_left_t>h1{font-size: 18px;font-weight: bold;display: flex;justify-content: space-between;align-items: center;}
.bt_left_t>h1>span{border-radius: 50%;width: 20px;height: 20px;border: 3px solid #fff;}
.bt_left_t>p{font-size: 16px;margin-top: 10px;}
.bt_left_l{padding: 10px 0;}
.bt_left_l>a{display: block;line-height: 50px;padding: 0 20px;cursor: pointer;border-bottom: 1px solid #ddd;color: #666;overflow: hidden;text-overflow: ellipsis;white-space: nowrap;}
.bt_left_l>.bt_left_a{background-color: var(--base);color: #fff;}
.bt_left_i{margin-bottom: 10px;}
.bt_left_i>a{background-color: #f7f7f7;border-left: 10px solid var(--base);height: 50px;line-height: 50px;display: block;padding-left: 24px;font-size: 16px;cursor: pointer;}
.bt_left_i>a>i{font-family: monospace,serif;float: right;font-style: normal;padding: 18px 10px;color: var(--base);line-height: 1;transition: .3s;}
.bt_left_ii{padding: 10px 0;display: none;}
.bt_left_ii>a{display: block;height: 46px;line-height: 46px;font-size: 14px;padding-left: 34px;color: #474747;cursor: pointer;}
.bt_left_ii>.bt_left_ia{background-color: var(--base);color: #fff;position: relative;}
.bt_left_ii>.bt_left_ia::before{content: '';width: 9px;height: 100%;position: absolute;left: 0;background-color: var(--base);}
.bt_right{width: 78%;background-color: #fff;}
.bt_right_t{}
.bt_right_t>h1{font-size: 24px;color: var(--base);font-weight: 600;border-bottom: 1px solid #ddd;line-height: 3;} */


@media screen and (max-width: 766px){
    /* .bt_head{height: 6rem;} */
    /* .bt_head_c{height: 6rem;} */
    .bt_head_c{height: 6rem;}
    .bt_head_l>a{padding: 1rem 0;}
    .bt_head_l>a>img{height: 4rem;}

    .bt_head_menu{width: 3rem;}
    .bt_head_menu>img{width: 100%;}

    .bt_head_r{position: fixed;top: 0;left: 0;background-color: #fff;flex-direction: column;padding: 50px 0;z-index: 100;transition: unset;display: none;margin: 0;width: 100%;height: 100%;}
    .bt_head_r>i{position: absolute;top: 20px;right: 20px;font-size: 30px;font-weight: bold;font-style: normal;line-height: 1;color: #666;}
    .bt_head_i{margin: 0;padding: 0;width: 100%;height: 6rem;}
    .bt_head_i>a{width: 100%;text-align: center;color: #999;height: 6rem;line-height: 6rem;margin: 0;padding: 0;font-size: 1.5rem;}
    .bt_head_i>a>h1{font-weight: 400;font-size: 1.8rem;}
    .bt_head_a>a{color: var(--base);font-weight: bold;}
    .bt_head_exc{display: none;}

    .bt_foot_t{height: unset;padding: 2rem 0;}
    .bt_foot_tc{flex-direction: column;}
    .bt_foot_tl{flex-wrap: wrap;justify-content: center;}
    .bt_foot_tl>a{padding: 1rem;border: 0;}
    .bt_foot_tl>a:first-child{padding-left: 1rem;}
    .bt_foot_tr{margin-top: 2rem;}
    .bt_foot_mc{flex-direction: column;gap: 2rem;padding: 2rem 0;}
    .bt_foot_mi{text-align: center;}
    .bt_foot_mi>img{height: 2rem;margin-right: 1rem;}
    .bt_foot_bc{flex-direction: column;align-items: center;line-height: 2;padding: 1rem 0;font-size: 1.4rem;}
    .bt_foot_bc>p{text-align: center;}

    .bt_banner>img{height: 30rem;object-fit: cover;}
    .bt_banner_w>h1{font-size: 2rem;}
    .bt_banner_w>p{font-size: 1.2rem;text-align: center;padding: 0 1.5rem;line-height: 1.6;}
    
    .bt_title{padding: 3rem 0;}
    .bt_title>h1{font-size: 2.6rem;}
    .bt_title>p{font-size: 1.6rem;margin-top: 1rem;}
    .bt_title>span{margin-top: 2rem;}
    
    .bt_nav{display: none;}

    .bt_cate{width: 100%;overflow: auto;}
    .bt_cate_c{width: 100%;justify-content: flex-start;padding: 0 1.5rem;gap: 1.5rem;height: 7rem;}
    .bt_cate_i{line-height: unset;width: auto;}
    .bt_cate_i>a{padding: 0 2rem;}
    
    .bt_cont{margin: 0 0 6rem;flex-direction: column;width: 100%;}
    .bt_left{width: 100%;border-radius: 0;overflow: auto;}
    .bt_left_t{display: none;}
    .bt_left_l{padding: 0;display: flex;width: 200vw;}
    .bt_left_i{margin-bottom: 0;}
    .bt_left_i>a{display: none;}
    .bt_left_ii{display: flex;padding: 2rem 0;}
    .bt_left_ii>a{padding: 0 2rem;height: 4rem;line-height: 4rem;}
    .bt_right{padding: 0 1.5rem;width: 100%;margin-top: 3rem;}

    .bt_nv{margin-top: 5rem;flex-direction: column;padding: 2rem;}
    .bt_nv_l{width: 100%;}
    .bt_nv_l>a{width: 100%;line-height: 2;}
    .bt_nv_l>a:last-child{text-align: left;}
    .bt_nv_r{margin-top: 2rem;}
    .bt_nv_r>a{height: 4rem;line-height: 4rem;padding: 0 2rem;}

}