/* 头部导航 */
.head_navigation {
    position: fixed;
    top: 0;
    left: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    height: 80px;
    padding: 0 15%;
    background-color: rgba(255, 255, 255, 0.95);
    z-index: 11;
    backdrop-filter: blur(5px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.head_logo {
    display: flex;
    align-items: center;
    padding: 10px 0;
}

.head_logo img {
    width: auto;
    height: 50px;
    max-width: 200px;
    cursor: pointer;
    transition: opacity 0.3s;
}

.head_logo img:hover {
    opacity: 0.8;
}

.head_list {
    display: flex;
    justify-content: space-between;
    width: 60%;
    height: 100%;
}

.head_list .head_list_item {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 600;
    color: rgba(75, 75, 75, 1);
    cursor: pointer;
    transition: color 0.3s;
}

.head_list .head_list_item a {
    display: block;
    width: 100%;
    height: 100%;
    line-height: 80px;
    text-align: center;
    color: inherit;
    text-decoration: none;
}

.head_list .head_list_item:hover {
    color: #FB8C00;
}

.head_list_item ul {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    min-width: 160px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    display: none;
    background-color: #fff;
    z-index: 12;
}

.head_list_item:hover ul {
    display: block;
}

.head_list_item ul li {
    position: relative;
    width: 100%;
    height: 45px;
    line-height: 45px;
    font-size: 14px;
    font-weight: 500;
    color: rgba(90, 90, 90, 1);
    text-align: center;
    white-space: nowrap;
    transition: all 0.2s;
    padding: 0 20px;
}

.head_list_item ul li:hover {
    color: #FB8C00 !important;
    background-color: rgba(251, 140, 0, 0.05);
}

.head_list_item ul li span {
    display: block;
    width: 100%;
    height: 100%;
    text-align: center;
}

.head_list_item ul li .subset_list {
    position: absolute;
    top: 0px;
    left: 100%;
    box-shadow: 4px 4px 12px rgba(0, 0, 0, 0.08);
    display: none;
    background-color: #fff;
    min-width: 160px;
    width: auto;
}

.head_list_item ul li:hover .subset_list {
    display: block;
}

.head_list_item ul li .subset_list div {
    min-width: 160px;
    box-sizing: border-box;
    height: 45px;
    line-height: 45px;
    font-size: 14px;
    font-weight: 500;
    color: rgba(90, 90, 90, 1);
    padding: 0 20px;
    transition: all 0.2s;
    text-align: center;
    white-space: nowrap;
}

.head_list_item ul li .subset_list div:hover {
    color: #FB8C00;
    background-color: rgba(251, 140, 0, 0.05);
}

.language_switching {
    display: flex;
    align-items: center;
    height: 100%;
}

.language_switching span {
    font-size: 14px;
    padding: 0 10px;
    height: 20px;
    line-height: 20px;
    text-align: center;
    cursor: pointer;
    color: rgba(90, 90, 90, 1);
    transition: color 0.3s;
}

.language_switching span:nth-child(1) {
    border-right: 1px solid #e6e6e6;
}

.language_switching span:hover {
    color: #FB8C00;
}

/**/
.bottom_navigation {
    display: flex;
    width: 100%;
    padding: 50px 10%;
    margin-top: 100px;
    background-color: #2B2B2B;
}

.bottom_navigation div {
    width: calc(100% / 6);
    height: 100%;
}

.bottom_navigation div span {
    display: block;
    width: 100%;
    height: 30px;
    color: #fff;
    font-weight: 700;
}

.bottom_navigation div ul {
    width: 100%;
    margin-top: 10px;
}

.bottom_navigation div ul li {
    width: 100%;
    margin-bottom: 10px;
    color: #a9a9a9;
    cursor: pointer;
}

.bottom_navigation div ul li:hover {
    color: #fff;
}

.bottom_navigation div ul li span {
    height: 20px;
    font-weight: 500;
    color: #a9a9a9;
}

.company_registration {
    width: 100%;
    padding: 20px 0;
    background-color: #2B2B2B;
    border-top: 1px solid #212121;
}

.company_registration span {
    display: block;
    width: 100%;
    height: 20px;
    line-height: 20px;
    text-align: center;
    font-size: 12px;
    font-family: 微软雅黑;
    font-style: normal;
    font-weight: normal;
    text-decoration: none;
    color: rgba(174, 174, 174, 1);
}

.company_registration span:nth-child(2) {
    cursor: pointer;
}

.company_registration span:nth-child(2):hover {
    color: rgb(76, 156, 248);
}

#back_to_top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: none;
}