/* banner START */
.banner {
    width: 100%;
    position: relative;
    text-align: center;
    overflow: hidden;
}
.banner .banner_list {
    width: 100%;
    height: 460px;
    position: relative;
    z-index: 1;
}
.banner .banner_list li {
    height: 100%;
    width: 100%;
    position: absolute;
    left: 0;
    top: 0;
    overflow: hidden;
    background-size: cover;
    background-position: center center;
}
.banner .banner_list li span {
    display: block;
    width: 100%;
    height: 1000px;
    /*background: rgba(0,0,0,0.5);*/
    position: absolute;
    top: 0;
    left: 0;

}

.banner .banner_center {
    height: 460px;
    position: absolute;
    width: 1200px;
    top: 0;
    left: calc((100% - 1200px) / 2);
    color: #e2e2e2;
    font-size: 14px;
    z-index: 9;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-direction: column;
    
}
.banner .banner_center .top {
    /*background: rgba(0,0,0,0.4);*/
    width: 70%;
    /*background: rgba(0,0,0,0.1);*/
    padding: 10px 15%;
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    overflow: hidden;
}
.banner .banner_center h2 {
    color: #fff;
    font-size: 46px;
}
.banner .banner_center h2+span {
    display: block;
    padding: 45px 0 0px;
    line-height: 28px;
}
.banner .banner_center .bottom {
    height: 105px;
    width: 100%;
    left: 0;
    margin: auto;
    background: #fff;
    color: #888;
    font-size: 18px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border-bottom: 1px solid #d6d6d6;
}
.banner .banner_center .bottom h3 {
    color: #333;
    font-size: 28px;
    margin-bottom: 5px;
}
/* banner END */


/* nav_bar START */
.nav_bar {
    position: relative;
}
.nav_bar .nav_bar_center {
    width: 1200px;
    margin: auto;
    padding: 20px 0 0;
}
.nav_bar .nav_bar_center .crumbs {
    display: flex;
    justify-content: flex-end;
    font-size: 16px;
    color: #555;
}
.nav_bar .nav_bar_center .crumbs a:hover {
    color: #d92219;
    text-decoration: underline;
}
.nav_bar .nav_bar_center .crumbs li a {
    display: flex;
    align-items: center;
}
.nav_bar .nav_bar_center .crumbs img {
    height: 16px;
    margin-right: 3px;
    margin-top: 3px;
}
.nav_bar .nav_bar_center .nav_list {
    padding: 36px 0;
    font-size: 18px;
    color: #666;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    font-size: 16px;
    text-align: center;
}
.nav_bar .nav_bar_center .nav_list li {
    margin: 0 5px;
    margin-bottom: 10px;
}
.nav_bar .nav_bar_center .nav_list li a {
    display: block;
    width: 210px;
    padding: 20px 0;
    background: #f4f4f4;
    position: relative;
    transition: all 0.3s;
}
.nav_bar .nav_bar_center .nav_list li.active a {
    background: #d92219;
    color: #fff;
}
.nav_bar .nav_bar_center .nav_list li a::after {
    content: "";
    display: none;
    position: absolute;
    bottom: 0;
    left: calc(50% - 12px);
    width: 0;
    height: 0;
    border: 12px solid rgba(0,0,0,0);
    border-bottom-color: #fff;
    animation: nav_bar_move 0.5s;
}
@keyframes nav_bar_move {
    0% {opacity: 0; bottom: -20px;}
    100% {opacity: 1; bottom: 0px;}
}
.nav_bar .nav_bar_center .nav_list li.active a::after {
    display: block;
}
.nav_bar .nav_bar_center .nav_list li a:hover {
    background: #d92219;
    color: #fff;
}
.nav_bar .nav_bar_center .nav_list li a:hover::after {
    display: block;
}
/* nav_bar END */


/* content public START */
.content_center {
    width: 1200px;
    margin: auto;
}
/* content public END */




/* 响应 START */
@media screen and (min-width: 1240px) {}
@media screen and (max-width: 1240px) {
    .banner .banner_list {
        height: 400px;
    }
    .banner .banner_center {
        height: 400px;
        width: 100%;
        left: 0;
    }
    .banner .banner_center h2 {
        font-size: 40px;
    }
    .banner .banner_center h2+span {
        padding: 35px 0 0px;
    }
    .banner .banner_center .bottom {
        height: 90px;
    }
    .banner .banner_center .bottom h3 {
        font-size: 24px;
    }
    .banner .banner_center .bottom span {
        font-size: 16px;
    }
    .nav_bar .nav_bar_center {
        width: 96%;
    }
    .content_center {
        width: 96%;
    }
}
@media screen and (max-width: 992px) {
    .banner .banner_center h2 {
        font-size: 36px;
    }
    .banner .banner_center h2+span {
        padding: 30px 0 0px;
    }
    .banner .banner_center .bottom {
        height: 70px;
    }
    .banner .banner_center .bottom h3 {
        font-size: 20px;
    }
    .banner .banner_center .bottom span {
        font-size: 16px;
    }
    .nav_bar .nav_bar_center .nav_list {
        padding: 25px 0; 
    }
    .nav_bar .nav_bar_center .nav_list li a {
        width: 180px;
        padding: 18px 0;
    }
    .nav_bar .nav_bar_center .nav_list li a {
        width: 180px;
        padding: 18px 0;
    }
}

@media screen and (max-width: 768px) {
    .nav_bar .nav_bar_center .crumbs{
        display: none;
    }
}

@media screen and (max-width: 576px) {
    .banner .banner_center .top {
        width: 90%;
        padding: 0 5%;
    }
    .banner .banner_center .bottom {
        height: 65px;
    }
    .banner .banner_center .bottom h3 {
        font-size: 18px;
    }
    .banner .banner_center .bottom span {
        font-size: 14px;
    }
    .banner .banner_center h2 {
        font-size: 28px;
    }
    .banner .banner_center h2+span {
        padding: 10px 0 0px;
    }
    .content_center {
        width: 96%;
    }
    .nav_bar .nav_bar_center {
        padding: 10px 0 0;
    }
    .nav_bar .nav_bar_center .crumbs {
        justify-content: center;
        flex-wrap: wrap;
    }
    .nav_bar .nav_bar_center .nav_list {
        padding: 20px 0; 
    }
    .nav_bar .nav_bar_center .nav_list li a {
        width: 160px;
        padding: 15px 0;
    }
    .nav_bar .nav_bar_center .nav_list li a::after {
        content: "";
        display: none;
        position: absolute;
        bottom: 0;
        left: calc(50% - 10px);
        width: 0;
        height: 0;
        border: 10px solid rgba(0,0,0,0);
        border-bottom-color: #fff;
        animation: nav_move 0.5s;
    }
}
@media screen and (max-width: 375px) {
    .banner .banner_center .top {
        padding: 0 5%;
    }
    .banner .banner_center h2 {
        font-size: 24px;
    }
    .banner .banner_center h2+span {
        padding: 5px 0 0px;
    }
    .banner .banner_center .bottom {
        height: 55px;
    }
    .banner .banner_center .bottom h3 {
        font-size: 16px;
    }
    .banner .banner_center .bottom span {
        font-size: 12px;
    }
    .nav_bar .nav_bar_center .nav_list li a {
        width: 120px;
        padding: 10px 0;
    }
    .nav_bar .nav_bar_center .nav_list li a {
        width: 120px;
        padding: 10px 0;
    }
    .nav_bar .nav_bar_center .nav_list li a::after {
        content: "";
        display: none;
        position: absolute;
        bottom: 0;
        left: calc(50% - 8px);
        width: 0;
        height: 0;
        border: 8px solid rgba(0,0,0,0);
        border-bottom-color: #fff;
        animation: nav_move 0.5s;
    }
}
/* 响应 END */