html,
body {
    margin: 0;
    padding: 0;
}

#nav {
    display: flex;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.5) !important;
    width: 100%;
    height: 86px;
    top: 20px;
    z-index: 1;
    position: absolute;
}

.logo {
    float: left;
}

.banner_div {
    height: auto;
    overflow: hidden;
}

li {
    list-style-type: none;
}

#menu {
    display: flex;
    align-items: center;
    float: left;
    margin: 0 103px;
    height: 100%;
    margin-left: 145px;
}

#menu ul {
    line-height: 50px;
    margin: 0;
    padding: 0;
}

#menu li {
    float: left;
    width: 104px;
    text-align: center;
    position: relative;
    border: none;
}

#menu li a {
    font-size: 15px;
    color: #e0e0e0;
    display: block;
    text-decoration: none;
}

#menu li:hover a {
    color: #fff;
    /*导航栏文字颜色 */
}

#menu li:hover .dropdown_1column {
    visibility: visible;
    opacity: 1;
    transition-duration: 0.5s;
}

.dropdown_1column {
    /* 下拉菜单边框颜色*/
    margin: 10px auto;
    position: absolute;
    border-top: none;
    opacity: 0;
    visibility: hidden;
    width: 104px;
    margin-left: -20px;
    transition-duration: 0.3s;
}

#menu li:hover div a {
    /* 下拉菜单文字颜色*/
    border-bottom: 1px solid #ab8965;
    height: 42px;
    line-height: 42px;
    color: #000;
    text-align: center;
    font-size: 14px;
    display: block;
    font-weight: normal;
    background-color: #fff;
}

#menu li:hover div a:hover {
    color: #e0e0e0;
}


/*下拉带单鼠标停留颜色*/

#menu li ul {
    list-style: none;
    padding: 10px 5px;
    margin: 0;
}

#menu li ul li {
    width: 130px;
}

.verticalLine {
    float: left;
    width: 1px;
    height: 200px;
    background-color: rgba(189, 189, 189, 0);
    opacity: 1;
    border-left-color: rgba(226, 229, 223, 0.2);
    border-left-style: solid;
    border-left-width: 1px;
    height: 100%;
}

@media screen and (min-width: 1025px) {
    #nav_m {
        display: none;
    }
}

@media screen and (max-width: 1025px) {
    html {
        font-size: 10px;
    }
    #nav {
        display: none;
    }
    ul {
        margin: 0;
        padding: 0;
    }
    #nav_m {
        width: 100%;
        height: 80px;
        background-color: #d4d4d4;
        position: absolute;
        z-index: 1000 !important;
        opacity: 0.9;
    }
    .m_logo {
        height: 60px;
        width: 195px;
        margin-top: 1.5%;
        float: left;
    }
    .m_menu {
        float: right;
        width: 60px;
        height: 60px;
    }
    .m_menuhead {
        margin: 50% auto;
        width: 25px;
    }
    .m_menuhead span {
        display: block;
        width: 25px;
        height: 1px;
        background-color: #3e3964;
        margin-top: 1vh;
    }
    .nav_menu {
        width: 100%;
        height: auto;
        background-color: rgba(0, 0, 0, 0.9);
        position: absolute;
        z-index: 1000 !important;
        top: 8.5vh;
        display: none;
    }
    .nav_menu ul {
        width: 80%;
        margin: 2.5vh auto;
        list-style: none;
        font-size: 2.5rem;
    }
    .nav_menu ul li a {
        display: inline-block;
        line-height: 100px;
        text-decoration: none;
        width: 100%;
        border-bottom: rgba(248, 248, 248, 0.589);
        border-bottom-style: solid;
        border-bottom-width: 1px;
        color: #fff;
    }
}