* {
    padding: 0;
    margin: 0;
    font-size: 16px;
    user-select: none;
    color: #fff;
    font-family: Arial, Helvetica, sans-serif;
}

ul {
    list-style: none;
    overflow: hidden;
}

li {
    float: left;
}

a {
    text-decoration: none;
}

.f-l {
    float: left;
}

.f-r {
    float: right;
}

.clearfix {
    clear: both;
}


/*导航栏*/

nav {
    width: 100%;
    max-width: 1920px;
    position: relative;
}

nav .backbase {
    height: 660px;
    max-height: 890px;
    background-image: url("../images/common/backbase.png");
    background-repeat: no-repeat;
    background-size: cover;
}

nav .backbase .back-box {
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

nav .backbase .back-box header {
    padding: 0 77px;
    height: 70px;
    display: flex;
    flex: 2;
    flex-wrap: nowrap;
}

nav .backbase .back-box header .nav-icon-box {
    width: 285px;
    height: 70px;
    display: flex;
    flex: 2;
    flex-wrap: nowrap;
}

nav .backbase .back-box header .nav-icon-box .icon-header {
    width: 155px;
    height: 70px;
    padding-left: 58px;
    background-image: url(../images/index/logoBg.png);
    background-repeat: no-repeat;
    /* background-position: -110px 0px; */
    background-size: 155px;
    display: table-cell;
    vertical-align: middle;
}

nav .backbase .back-box header .nav-icon-box .icon-header .icon-text {
    padding-top: 18px;
    width: 145px;
}

nav .backbase .back-box header .nav-icon-box .city-list {
    width: 105px;
    height: 70px;
    line-height: 70px;
}

nav .backbase .back-box header .nav-icon-box .city-list a {
    width: 55px;
    height: 30px;
    text-align: left;
    line-height: 30px;
    font-size: 13px;
    display: inline-block;
    padding-right: 16px;
    background-image: url(../images/common/line.png);
    background-repeat: no-repeat;
    background-position: 38px 9px;
}

nav .backbase .back-box header .nav-list {
    width: 761px;
    height: 62px;
    line-height: 54px;
    color: #fff;
    float: right;
}

nav .backbase .back-box header .nav-list ul {
    display: inline-block;
    vertical-align: middle;
    list-style: none;
    overflow: hidden;
}

nav .backbase .back-box header .nav-list ul li {
    float: left;
    text-align: center;
    width: 67px;
    margin-left: 30px;
}

nav .backbase .back-box header .nav-list ul li a {
    display: block;
    height: 53px;
    font-size: 14px;
    position: relative;
}

nav .backbase .back-box header .nav-list ul li a span {
    width: 100%;
    height: 1px;
    background-color: #fff;
    position: absolute;
    bottom: 0;
    left: 0;
    opacity: 0;
}

nav .backbase .back-box header .nav-list ul li a:hover span {
    opacity: 1;
    transition: opacity 0.3s ease 0s;
}

nav .backbase .back-box header .nav-list ul li a.active span {
    opacity: 1;
}

nav .backbase .back-box header .nav-list ul li:first-of-type {
    margin-left: 0;
}

nav .backbase .back-box header .nav-list .about-us {
    display: inline-block;
    vertical-align: middle;
    margin-left: 70px;
}

nav .backbase .back-box header .nav-list .about-us p {
    height: 70px;
    line-height: 73px;
    font-size: 17px;
    font-weight: 600;
}

nav .backbase .back-box main {
    margin: 0 267px;
    height: 530px;
}

nav .backbase .back-box main .nav-screen {
    width: 1132px;
    display: table-cell;
    vertical-align: middle;
}

nav .backbase .back-box main .nav-screen .nav-screen-header {
    width: 530px;
    height: 90px;
    line-height: 90px;
    position: relative;
    margin: 0 auto;
    margin-top: 80px;
}

nav .backbase .back-box main .nav-screen .nav-screen-header p {
    font-size: 37px;
    font-weight: 500;
    text-align: center;
}

nav .backbase .back-box main .nav-screen .nav-screen-header .f-title {
    color: #acaeaf;
    text-align: center;
    font-size: 13px;
    position: absolute;
    left: 31px;
    bottom: -5px;
    line-height: 20px;
    z-index: 999;
}

nav .backbase .back-box main .nav-screen .nav-screen-header::after,
nav .backbase .back-box main .nav-screen .nav-screen-header::before {
    content: '';
    display: block;
    width: 145px;
    height: 1px;
    border-bottom: 1px solid #acaeaf;
    position: absolute;
    bottom: 0px;
}

nav .backbase .back-box main .nav-screen .nav-screen-header::after {
    left: -145px;
}

nav .backbase .back-box main .nav-screen .nav-screen-header::before {
    right: -145px;
}

nav .backbase .back-box main .nav-screen .nav-screen-content {
    width: 880px;
    height: 360px;
    margin: 0 auto;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list {
    padding: 0 15px;
    position: relative;
    display: flex;
    flex: 3;
    flex-wrap: nowrap;
    margin-top: 50px;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item {
    width: 250px;
    height: 250px;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .circle-item {
    width: 110px;
    height: 110px;
    margin: 0 auto;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .circle-item .item-box {
    height: 100%;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 50%;
    position: relative;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .circle-item .item-box .item-back {
    width: 103px;
    height: 103px;
    border: 4px solid rgba(255, 255, 255, 0.4);
    border-radius: 50%;
    display: table-cell;
    vertical-align: middle;
    position: relative;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .circle-item .item-box .item-back img {
    margin: 0 auto;
    display: block;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .circle-item .item-box .item-back .item-border {
    position: absolute;
    box-sizing: border-box;
    width: 110px;
    height: 110px;
    border-radius: 100%;
    background-color: transparent;
    border: 4px solid #fff;
    top: 50%;
    left: 50%;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .circle-item .item-box .item-back .item-border.ani-1 {
    animation: circleItem1 1s linear 1 both;
    transform: translate(-50%, -50%) rotateZ(45deg);
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .circle-item .item-box .item-back .item-border.ani-2 {
    animation: circleItem2 1s linear 1 both;
    transform: translate(-50%, -50%) rotateZ(30deg);
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .circle-item .item-box .item-back .item-border.ani-3 {
    animation: circleItem3 1s linear 1 both;
    transform: translate(-50%, -50%) rotateZ(15deg);
}

@keyframes circleItem1 {
    0% {
        /*裁切一个 0 宽的圆线出来*/
        clip-path: polygon(0% 0%, 0% 0%, 0% 0%, 0% 0%, 0% 0%, 50% 50%);
    }
    25% {
        clip-path: polygon(0% 0%, /* 左上角 */
        100% 0%, /* 右上角 */
        100% 0%, /* 右下角 */
        100% 0%, /* 左下角 */
        100% 0%, /* 中心店 */
        50% 50%);
    }
    50% {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 100% 100%, 100% 100%, 50% 50%);
    }
    75% {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%, 0% 100%, 50% 50%);
    }
    100% {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%, 0% 100%, 50% 50%);
    }
}

@keyframes circleItem2 {
    0% {
        /*裁切一个 0 宽的圆线出来*/
        clip-path: polygon(0% 0%, 0% 0%, 0% 0%, 0% 0%, 0% 0%, 50% 50%);
    }
    25% {
        clip-path: polygon(0% 0%, /* 左上角 */
        100% 0%, /* 右上角 */
        100% 0%, /* 右下角 */
        100% 0%, /* 左下角 */
        100% 0%, /* 中心店 */
        50% 50%);
    }
    50% {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 100% 100%, 100% 100%, 50% 50%);
    }
    75% {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%, 0% 100%, 50% 50%);
    }
    100% {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%, 0% 60%, 50% 50%);
    }
}

@keyframes circleItem3 {
    0% {
        /*裁切一个 0 宽的圆线出来*/
        clip-path: polygon(0% 0%, 0% 0%, 0% 0%, 0% 0%, 0% 0%, 50% 50%);
    }
    25% {
        /*将圆形分为四份，代表左上角、右上角、右下角、左下角。中心点*/
        clip-path: polygon(0% 0%, /* 左上角 */
        100% 0%, /* 右上角 */
        100% 0%, /* 右下角 */
        100% 0%, /* 左下角 */
        100% 0%, /* 中心点 */
        50% 50%);
    }
    50% {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 100% 100%, 100% 100%, 50% 50%);
    }
    75% {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%, 0% 100%, 50% 50%);
    }
    100% {
        clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%, 0% 40%, 50% 50%);
    }
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .text-item {
    text-align: center;
    margin-top: 50px;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .text-item p {
    color: #fff;
    font-size: 12px;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item .text-item p span {
    font-size: 19px;
}

nav .backbase .back-box main .nav-screen .nav-screen-content .nav-screen-list .nav-screen-item:nth-of-type(2) {
    margin: 0 130px;
}

nav .backbase .back-box footer {
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
}

nav .backbase .back-box footer .nav-footer {
    margin: 0 267px;
}

nav .backbase .back-box footer .nav-footer ul li {
    text-align: center;
}

nav .backbase .back-box footer .nav-footer ul li a {
    color: #fff;
    font-size: 13px;
    line-height: 60px;
    display: block;
    padding: 0 55px;
}

nav .backbase .back-box footer .nav-footer ul li a:hover {
    background-color: #11a55b;
    transition: all 0.5s;
}

nav .backbase .back-box footer .nav-footer li.active a {
    background-color: #11a55b;
}

footer {
    width: 100%;
    height: 286px;
}

footer .link-list-box {
    padding: 40px 195px 20px 195px;
    background-color: #373d41;
}

footer .link-list-box .link-list {
    display: flex;
    flex: 4;
    flex-wrap: nowrap;
    justify-content: center;
    align-items: center;
}

footer .link-list-box .link-list .link-item {
    width: 250px;
    height: 160px;
    padding-top: 20px;
    position: relative;
}

footer .link-list-box .link-list .link-item .item-title {
    color: #fff;
    font-size: 14px;
    text-align: left;
    margin-bottom: 15px;
    font-weight: 100;
}

footer .link-list-box .link-list .link-item .aboutus {
    width: 190px;
    height: 110px;
    padding-top: 9px;
    display: inline-block;
    vertical-align: top;
}

footer .link-list-box .link-list .link-item .aboutus p {
    padding-left: 2px;
}

footer .link-list-box .link-list .link-item .aboutus ul {
    margin-right: 60px ;
}

footer .link-list-box .link-list .link-item .aboutus ul li {
    display: flex;
    flex: 2;
    flex-wrap: nowrap;
    align-items: center;
}

footer .link-list-box .link-list .link-item .aboutus ul li span {
    margin-top: 2px;
    margin-left: 5px;
}

footer .link-list-box .link-list .link-item .code-box {
    display: inline-block;
    vertical-align: middle;
}

footer .link-list-box .link-list .link-item .code-box p {
    font-size: 12px;
    text-align: center;
    color: #acaeaf;
    margin-top: 3px;
}

footer .link-list-box .link-list .link-item ul {
    display: inline-block;
    vertical-align: middle;
}

footer .link-list-box .link-list .link-item ul li {
    float: none;
    margin-bottom: 10px;
}

footer .link-list-box .link-list .link-item ul li a {
    font-size: 12px;
    color: #acaeaf;
}

footer .link-list-box .link-list .link-item ul:last-of-type {
    float: right;
    margin-right: 45px;
}

footer .link-list-box .link-list .link-item::before {
    content: '';
    width: 1px;
    height: 65px;
    background-color: #acaeaf;
    opacity: 0.5;
    position: absolute;
    left: 0;
    top: 50%;
    transform: translate(0%, -84%);
    border-radius: 50%;
}

footer .link-list-box .link-list .link-item:first-of-type {
    width: 176px;
    padding-left: 5px;
}

footer .link-list-box .link-list .link-item:first-of-type::before {
    display: none;
}

footer .link-list-box .link-list .link-item:nth-of-type(2) {
    width: 245px;
    padding-left: 45px;
}

footer .link-list-box .link-list .link-item:nth-of-type(3) {
    width: 175px;
    padding-left: 40px;
}

footer .link-list-box .link-list .link-item:last-of-type {
    width: 350px;
    padding-left: 45px;
    padding-top: 0px;
}

footer .Mit {
    width: 100%;
    height: 45px;
    background-color: #2a2e31;
    text-align: center;
}

footer .Mit p {
    line-height: 45px;
    color: #acaeaf;
    font-size: 12px;
}
footer .Mit  a{
    line-height: 45px;
    color: #409EFF;
    font-size: 12px;
}
.sidebar {
    width: 40px;
    height: 185px;
    position: fixed;
    bottom: 150px;
    right: 45px;
}

.sidebar .sidebar-item {
    width: 40px;
    height: 40px;
    background-color: rgba(0, 0, 0, 0.9);
    margin-top: 5px;
}

.sidebar .sidebar-item a {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar .sidebar-item a:hover,
.sidebar .sidebar-item a.active {
    background-color: #11a55b;
    transition: all 0.2s ease 0s;
}

.sidebar .sidebar-item:first-of-type {
    margin-top: 0;
}

.sidebar.active {
    position: static;
}

header {
    padding: 0 77px;
    height: 70px;
    display: flex;
    flex: 2;
    flex-wrap: nowrap;
}

header .nav-icon-box {
    width: 285px;
    height: 70px;
    display: flex;
    flex: 2;
    flex-wrap: nowrap;
}

header .nav-icon-box .icon-header {
    width: 155px;
    height: 70px;
    padding-left: 58px;
    background-image: url(../images/index/logoBg.png);
    background-repeat: no-repeat;
    background-size: 155px;
    display: table-cell;
    vertical-align: middle;
    margin-top: 6px;
}

header .nav-icon-box .icon-header .icon-text {
    padding-top: 18px;
    width: 145px;
}

header .nav-icon-box .city-list {
    width: 105px;
    height: 70px;
    line-height: 70px;
}

header .nav-icon-box .city-list a {
    width: 55px;
    height: 30px;
    text-align: left;
    line-height: 30px;
    font-size: 13px;
    display: inline-block;
    padding-right: 16px;
    background-image: url(../images/common/line.png);
    background-repeat: no-repeat;
    background-position: 38px 9px;
}

header .nav-list {
    width: 761px;
    height: 62px;
    line-height: 54px;
    color: #fff;
    float: right;
}

header .nav-list ul {
    display: inline-block;
    vertical-align: middle;
    list-style: none;
    overflow: hidden;
}

header .nav-list ul li {
    float: left;
    text-align: center;
    width: 67px;
    margin-left: 30px;
}

header .nav-list ul li a {
    display: block;
    height: 53px;
    font-size: 14px;
    position: relative;
}

header .nav-list ul li a span {
    width: 100%;
    height: 1px;
    background-color: #fff;
    position: absolute;
    bottom: 0;
    left: 0;
    opacity: 0;
}

header .nav-list ul li a:hover span {
    opacity: 1;
    transition: opacity 0.3s ease 0s;
}

header .nav-list ul li a.active span {
    opacity: 1;
}

header .nav-list ul li:first-of-type {
    margin-left: 0;
}

header .nav-list .about-us {
    display: inline-block;
    vertical-align: middle;
    margin-left: 70px;
}

header .nav-list .about-us p {
    height: 70px;
    line-height: 73px;
    font-size: 17px;
    font-weight: 600;
}