body {
        padding: 0;
        margin: 0;
    }
    
    .splite {
        padding-top: 56px;
    }
    
    ul {
        list-style: none;
    }
    
    a {
        text-decoration: none;
    }
    
    .clear {
        clear: both;
    }
    
    .fl {
        float: left;
    }
    
    .fr {
        float: right;
    }

    .color_blue {
        color: #0469e3;
    }

    .color_black {
        color: #000;
    }
    
    .nav_bg {
        background-color: #333437;
        position: fixed;
        width: 100%;
        z-index: 999;
    }
    
    .nav {
        max-width: 1920px;
        min-width: 768px;
        margin: 0 auto;
        display: flex;
        justify-content: space-between;
        align-items: center;
        top: 0;
        z-index: 999;
        /* border-bottom: 1px solid #e5e5e5; */
        overflow: hidden;
        box-sizing: border-box;
        padding: 0 24px;
    }
    
    .menu a:hover {
        opacity: 0.7;
    }
    
    .nav .logo {
        width: 116px;
    }
    
    .nav ul {
        display: flex;
        gap: 32px;
    }
    
    .nav ul li a {
        padding: 16px 16px;
        color: #fff;
    }
    /* sitmap */
    
    .footer a {
        text-decoration: none;
        color: inherit;
    }
    
    .footer a:hover {
        color: #2697FF;
    }
    
    .footer {
        background: #1b1c22;
        color: #cacaca;
        padding: 48px 48px 24px 48px;
    }
    
    .footer ul {
        margin: 0 0 24px 0;
    }
    
    .footer .sitemap {
        display: flex;
        max-width: 1280px;
        margin: 0 auto;
        font-size: 14px;
        padding: 0px;
    }
    
    .footer .sitemap ul {
        padding: 0;
        margin-right: 24px;
        display: flex;
        gap: 48px;
    }
    
    .footer .sitemap li {
        list-style: none;
        padding: 6px 0;
        opacity: 0.8;
    }
    
    .footer .sitemap p {
        font-size: 12px;
        opacity: 0.7;
    }
    
    .footer .copyright {
        color: #fff;
        font-size: 12px;
        opacity: 0.7;
        max-width: 1280px;
        margin: 0 auto;
        padding: 16px 0;
        border-top: 1px solid #cacaca42;
    }
    
    @media screen and (max-width:500px) {
        .nav {
            flex-direction: column;
            width: 100%;
            min-width: 320px;
            padding: 0;
        }
        .nav .logo {
            width: 160px;
            padding: 8px;
        }
        .nav ul {
            width: max-content;
            min-width: 100%;
            gap: 0;
            padding: 0;
            margin: 0;
            justify-content: flex-start;
            background-color: #eeeeee;
        }
        .nav ul li a {
            display: block;
            text-align: center;
            font-size: 14px;
            color: #000;
            white-space: nowrap;
            padding: 12px 16px;
        }
        .nav .menu_bg {
            display: flex;
            width: 100%;
            overflow-x: auto;
            background-color: #eeeeee;
        }
        .splite {
            padding-top: 100px;
        }
        .footer {
            position: relative;
            padding: 16px;
            margin-bottom: 80px;
        }
        .footer .sitemap {
            flex-wrap: wrap;
        }
        .footer .sitemap > div {
            width: 100%;
        }
        .footer .sitemap ul {
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 0;
            width: 100%;
        }
        .footer ul li a {
            padding: 12px 0;
            display: block;
            width: 100%;
        }
    }