.head {
    width: 100%;
    height: 64px;
    line-height: 64px;
    transition: all .5s;
    color: #fff;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 999;
}

.head:hover {
    background: #fff;
    color: #000;
}

.head_center {
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
}

.head_center div {
    float: left;
}

.head_nav li {
    float: left;
    margin: 0 10px;
    cursor: pointer;
}

.head_nav li a {
    color: #fff;
}

.head:hover li a {
    color: #000;
}

.head_logo {
    width: 46px;
    height: 64px;
    background: url('../images/logo_w.png') no-repeat center;
}

.head:hover .head_logo {
    background: url('../images/logo_b.png') no-repeat center;
}

.head .head_tel {
    float: right;
}

.head .wap_head_mean {
    float: right;
    display: none;
    font-size: 20px;
    cursor: pointer;
    position: relative;
    z-index: 999;
}

.head_text {
    display: none;
}

@media (max-width:1200px) {
    .head {
        background: #fff;
        position: relative;
        height: 56px;
        line-height: 56px;
    }
    .head_center {
        width: 90%;
    }
    .head_logo {
        height: 56px;
        background: url('../images/logo_b.png') no-repeat center;
    }
    .head {
        color: #000;
    }
    .head_nav li {
        border-bottom: 1px solid #fff;
    }
    .head_nav li a {
        color: #fff;
    }
    .head:hover li a {
        color: #fff;
    }
    .head_nav {
        position: fixed;
        height: 100%;
        width: 100%;
        background: rgba(80, 132, 191, 0.8);
        left: 100%;
    }
    .head_nav ul li {
        float: none;
        text-align: center;
    }
    .head .head_tel {
        display: none;
    }
    .head .wap_head_mean,
    .head_text {
        display: block;
    }
}