html {
    /* 让滚动条丝滑的滚动 */
    scroll-behavior: smooth;
}

/* 版心先设置好 */
.wrapper {
    margin: 0 auto;
    width: 1280px;
}

/* 头部区域导航栏 */
.header {
    /* 固定定位新用法 sticky*/
    /* -webkit 兼容浏览器 */
    position: -webkit-sticky;
    position: sticky;
    top: 0px;
    height: 68px;
    background: #FFF;
    border-bottom: #dfdfdf 1px solid;
    z-index: 111;
}

.header .wrapper {
    display: flex;
    height: 68px;
    align-items: center;
}

/* logo图片 */
.logo a {
    display: block;
    width: 135px;
    height: 37px;
    background-image: url(../images/logo.png);
    font-size: 0;
}

/* 导航 */
.nav {
    margin-left: 486px;

}

.nav ul {
    display: flex;
    width: 456px;
    height: 68px;
    flex-wrap: nowrap;
    justify-content: space-between;
    align-items: center;
    margin-right: 100px;
}

.nav li a {
    font-size: 16px;
    color: #222;
}

/* active 类选择器，表示默认选中的a */
.nav li .active,
.nav li a:hover {
    color: #FD6350;
    border-bottom: 3px solid #FD6350;
    padding-bottom: 21px;
}

.nav-btn a {
    display: block;
    width: 104px;
    height: 40px;
    background-color: #FD6350;
    text-align: center;
    line-height: 40px;
    font-size: 16px;
    color: #FFF;
    border-radius: 20px;
}

.nav-btn a:hover {
    background-color: #080346;
}

/* 底部版权 */
.footer {
    padding-top: 75px;
    height: 348px;
    background-image: url(../images/web_bottom_bj.png);
    background-size: cover;
}

.footer .wrapper {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;

}

.footer .left {
    width: 183px;
}

.footer .right {
    display: flex;
    flex-wrap: wrap;
}

.footer .right dl {
    margin-left: 130px;
}

.footer .right dt {
    margin-bottom: 18px;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
}

.footer .right a {
    font-size: 16px;
    line-height: 40px;
    color: #CACACA;
}

.footer .right dd {
    font-size: 16px;
    line-height: 40px;
    color: #CACACA;
}

.footer .right dd a:hover {
    color: #fff;
}

/* 备案号 */
.record {
    height: 85px;
    background: #181818;
}

.record p a {
    display: block;
    font-size: 14px;
    line-height: 85px;
    color: #949494;
    text-align: center;
}

.record p a:hover {
    color: #585858;
}

/* 回到顶部TOP */
.top {
    position: fixed;
    right: 3%;
    top: 80%;
    width: 56px;
    height: 56px;
    background-color: #fff;
    border-radius: 50%;
    box-shadow: 0px 0px 10px 0px rgba(0, 0, 0, 0.2);
    opacity: 0;
    transition: all .5s;
}

.top a {
    margin: 15px auto;
    display: block;
    font-size: 12px;
    color: #000;
    text-align: center;
    line-height: 20px;
}

.top a:hover {
    color: #FD6350;
}

.top a i {
    margin: 0 auto;
    display: block;
    width: 14px;
    height: 9px;
    background-image: url(../images/top.png);
}