.header {
    height: 0.6rem;
    line-height: 0.6rem;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 0 1.4rem;
    background: rgba(255, 255, 255, .95);
    box-shadow: 0 0 .2rem rgba(0, 0, 0, 0.3);
    z-index: 999;
    transition: background .3s;
}

.header.first {
    background: rgba(0, 0, 0, 0.2);
    transition: background .3s;
}

.header .logo {
    width: 1.2rem;
    height: 0.3rem;
    margin-top: 0.15rem;
    background-image: url("../img/logo_svg_blue.svg");
    background-repeat: no-repeat;
    background-size: 100%;
}

.header.first .logo {
    background: url("../img/logo_svg.svg") no-repeat;
    background-size: 100%;
}

.menu_btn {
    width: 30px;
    height: 20px;
    float: right;
    line-height: 20px;
    margin-top: 5px;
    text-align: center;
    display: none;
}

.menu_btn .icon {
    width: 20px;
    height: 20px;
    vertical-align: middle;
    fill: currentColor;
    overflow: hidden;
    color: #333;
}

.header.first .menu_btn .icon {
    color: #fff;
}

.header .menu {
    font-size: .16rem;
    position: relative;
}

.header .menu .menu_item {
    float: left;
    position: relative;
}

.header .menu .menu_item a {
    display: block;
    color: #333;
    padding: 0 .3rem;
    text-decoration: none;
}

.header.first .menu .menu_item a {
    color: #fff;
}

.header .menu .active_line {
    width: .5rem;
    height: .03rem;
    background-color: #3586ea;
    position: absolute;
    bottom: 0;
    transition: left .3s;
    pointer-events: none;
}

.header .menu .menu_item .drop_down_menu {
    position: absolute;
    width: 1.6rem;
    left: 50%;
    margin-left: -.8rem;
    top: 100%;
    background: #fff;
    list-style: none;
    text-align: center;
    display: none;
}

.header.first .menu .menu_item .drop_down_menu {
    background: rgba(0, 0, 0, 0.2);
}

.header .menu .menu_item .drop_down_menu li {
    line-height: 1;
    padding: .2rem 0 .15rem;
}

.header .menu .menu_item .drop_down_menu li a {
    text-decoration: none;
}

.header .menu .menu_item .drop_down_menu li.active a,
.header .menu .menu_item .drop_down_menu li:hover a {
    color: #3586ea;
}

.content {
    min-height: 100%;
    padding-top: .6rem;
    padding-bottom: 2.62rem;
    margin-bottom: -2.62rem;
    position: relative;
}

@media (max-width: 768px) {
    .header {
        height: 30px;
        line-height: 30px;
    }
    .header .logo {
        width: 90px;
        height: 17px;
        margin-top: 7px;
    }
    .menu_btn {
        display: block;
    }
    .header .menu {
        display: none;
        background: rgba(255, 255, 255, .95);
        position: absolute;
        left: 0;
        top: 100%;
        width: 100%;
        text-align: center;
        border-top: 1px solid #ddd;
    }
    .header.first .menu {
        background: rgba(0, 0, 0, 0.2);
    }
    .header .menu .menu_item {
        float: none;
    }
    .header .menu .active_line {
        display: none;
    }
    .content {
        padding-top: 30px;
    }
}