.header{
    width: 100%;
    height: 100px;
    background-color: white;
    position: fixed;
    top: 0px;
    left: 0px;
}

.container{
    width: 100%;
    height: 100px;
    text-align: center;
}

.log_text{
    float: right; 
    font-size: 20px; 
    color:black; 
    background-color:transparent;
    border-radius: 0px 5px 5px 0px;
    font-weight: bold;
    font-style: oblique;
}

.header .logo{
    float: left;
    margin-top: 40px;
    height: 30px;
}

.header .menu_app{
    float: right;
    margin-top: 40px;
    height: 30px;
    margin-right: 100px;
}

.menu_app_item{
    display: none;
    border-radius: 10px;
    position: absolute;
    right: 30px;
    top: 60px;
    padding-left: 0px;
    background-color: grey;
    text-align: left;
    width: 160px;
}

.sub_menu_app{
    display: none;
}

/*
.menu_app:hover{
    cursor: pointer;
}

.menu_app:hover .menu_app_item li a{
    color: black;
}

.menu_app:hover .menu_app_item{
    display: block;
}
*/
.menu_app .menu_app_item li{
    float: none;
    padding: 10px 0px 0px 8px;
}

.logo a{
    display: block;
    width: 150px;
    height: 150px;
}

.header a{
    text-decoration: none;
    color: black;
    cursor: pointer;
}

.header .list{
    float: left;
    height: 88px;
    padding: 12px 0 0 30px;
    margin-top: 0px;
    margin-left: 180px;
    position: absolute;
}

/*手机*/
@media screen and (max-width:600px){
    .header .list {
        display: none;
    }

    .menu_app{
        display: block;
    }
}
/*平板*/
@media screen and (min-width:600px) and (max-width:960px){
    .header .list {
        display: block;
    }

    .menu_app{
        display: none;
    }
}
/*PC*/
@media screen and (min-width:960px){
    .header .list {
        display: block;
    }

    .menu_app{
        display: none;
    }
}

.header li{
    float: left;
    list-style: none;
}

.list li{
    display: block;
    color: rgb(68, 57, 5);
    font-size: 20px;
    padding: 25px 0px 0px 60px;
}

.first_li{
    margin-left: -60px;
}

.list li:hover a{
    color: black;
    font-weight: bold;
}

.product_sub, .solution_sub, .help_sub{
    display: none;
    background-color:lightgreen;
    border-radius: 15px;
    text-align: left;
}

.product_sub li, .solution_sub li, .help_sub li{
    float:none;
    margin-left: -30px;
    padding: 10px;
}

.list li:hover .product_sub a, .list li:hover .solution_sub a, .list li:hover .help_sub a{
    color: black;
    font-weight:normal;
}

.list li:hover .product_sub,.list li:hover .solution_sub,.list li:hover .help_sub{
    display:block;
    position: absolute;
}

.list li:hover .arrow_down{
    transform: rotate(-135deg);
    -webkit-transform: rotate(-135deg);
    margin-bottom: 0px;
}

.list li:hover .product_sub li:hover a, .list li:hover .solution_sub li:hover a, .list li:hover .help_sub li:hover a{
    color: blue;
}

.product_android_sub{
    display: none;
}

.product_android_sub li{
    margin-left: 0px;
}

.list li:hover .product_sub li:hover .product_android_sub{
    display:none;
}

.list li:hover .product_sub li:hover .product_android_sub a{
    color: gray;
}

.list li:hover .product_sub li:hover .product_android_sub li:hover a{
    color: blue;
}

i {
    /* 用border值来控制箭头粗细 */
    border: 3px solid black;
    /* 上、右、下、左  四个边框的宽度 */
    border-width: 0px 1px 1px 0px;
   
    display: inline-block;
    /* padding值控制箭头大小 */
    padding: 5px;
}


.arrow_right {
    transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
}
   
.arrow_left {
    transform: rotate(135deg);
    -webkit-transform: rotate(135deg);
}
   
.arrow_up {
    transform: rotate(-135deg);
    -webkit-transform: rotate(-135deg);
}
   
.arrow_down {
    transform: rotate(45deg);
    -webkit-transform: rotate(45deg);
    margin-bottom: 3px;
}

.menuico{
    margin-top:-5px;
}

.menuico span {
    display: block;
    width: 30px;
    height: 4px;
    background-color: #666;
    margin-top: 5px;
}
.backToTop{
    position: fixed;
    bottom: 40px;
    right: 30px;
    display: none;
    padding: 10px 15px;
    font-size: 14px;
    border: none;
    border-radius: 6px;
    background-color: #007bff;
    color: white;
    cursor: pointer;
    z-index: 1000;
}
/*面包屑导航*/
.nav_bread{
    margin-top: 110px;
}
.breadcrumb {
    list-style: none;
    display: flex;
    font-size: 14px;
    padding: 0;
}
.breadcrumb li {
    margin-right: 5px;
}
.breadcrumb a {
    text-decoration: none;
    color: #337ab7;
}
.breadcrumb a:hover {
    text-decoration: underline;
}