.banner {
    width: 100%;
    height: 500px;
    background: url('../img/us/guanyu_02.jpg') no-repeat center center;
    background-size: cover;
    position: relative;
}

.banner .text1 {
    line-height: 66px;
    height: 66px;
    font-weight: 700;
    font-size: 60px;
    position: absolute;
    width: 100%;
    text-align: center;
    top: 185px;
    color: #fff;
    z-index: 999;
}

.banner .text2 {
    line-height: 76px;
    height: 76px;
    font-size: 43px;
    position: absolute;
    width: 100%;
    text-align: center;
    top: 250px;
    color: #fff;
    z-index: 999;
}

.common-title {
    line-height: 36px;
    height: 36px;
    font-size: 30px;
    text-align: center;
    color: #333;
    margin: 95px 0 57px;
}

.nav {
    width: 100%;
    height: 66px;
    box-shadow: 0px 7px 7px -7px #eee;
}

.nav ul {
    overflow: hidden;
    width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
}

.nav ul li {
    float: left;
    width: 200px;
    height: 66px;
    line-height: 66px;
    text-align: center;
}

.nav ul li:hover a {
    color: #30c8c6;
}

.nav ul li a {
    color: #333;
    font-size: 16px;
    line-height: 16px;
    width: 100%;
    display: inline-block;
    border-right: 1px solid #e4e4e4;
    margin-top: 25px;
}

.curr {
    color: #11cc80 !important;
}

.history {
    margin: 0 auto 90px;
    width: 1200px;
}

.history .info {
    line-height: 30px;
    text-align: left;
    color: #333;
    font-size: 14px;
}

.detail-content {
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
}

.detail-content .year-list {
    width: 100%;
    overflow: hidden;
}

.detail-content .year-list li {
    margin-bottom: 90px;
    overflow: hidden;
}

.detail-content .year-list li .year-left,
.detail-content .year-list li .year-center,
.detail-content .year-list li .year-right {
    float: left;
}

.year-list > li:nth-child(n + 2) .des-list {
    height: 60px;
}

.year-list > li:nth-child(n + 2) .down-btn {
    background: url('../img/us/gya_41.png') no-repeat center center;
    background-size: 100% 100%;
}

.year-left {
    width: 250px;
    padding-top: 25px;
}

.year-left .title {
    line-height: 24px;
    text-align: right;
    color: #333333;
    font-size: 18px;
}

.year-left .img-wrapper {
    width: 250px;
    height: 148px;
    margin-top: 38px;
}

.year-left .img-wrapper img {
    width: 100%;
    height: 100%;
}

.year-right {
    position: relative;
    margin-left: 45px;
}

.year-right .right-top {
    overflow: hidden;
    margin-bottom: 38px;
}

.year-right .right-top .year-num {
    float: left;
    font-size: 60px;
    font-family: Arial;
    font-weight: normal;
    color: rgba(51, 51, 51, 1);
    opacity: 0.17;
    line-height: 48px;
}

.year-right .right-top .down-btn {
    width: 20px;
    height: 20px;
    margin-top: 23px;
    float: left;
    font-size: 60px;
    margin-left: 13px;
    background: url('../img/us/gya_08.png') no-repeat center center;
    background-size: 100% 100%;
}

.year-right .des-list {
    padding-left: 9px;
    position: relative;
    -webkit-transition: height 1s;
    -moz-transition: height 1s;
    -ms-transition: height 1s;
    -o-transition: height 1s;
    transition: height 1s;
    height: auto;
}

.year-right .des-list li {
    margin-bottom: 32px;
    overflow: hidden;
    margin-left: 10px;
}

.year-right .des-list li:last-child {
    margin-bottom: 0;
}

.des-list .year-line {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 10px;
    width: 9px;
}

.des-list .year-line .cir {
    position: absolute;
    width: 9px;
    height: 9px;
    background: #45cbca;
    border-radius: 50%;
    -webkit-border-radius: 50%;
    left: 0;
    top: 0;
}

.des-list .year-line .line {
    position: absolute;
    width: 1px;
    background: #eeeeee;
    bottom: 0;
    top: 20px;
    left: 4px;
}

.des-list li span:nth-child(1) {
    float: left;
    height: 18px;
    text-align: center;
    line-height: 18px;
    font-size: 14px;
    color: #333;
}

.des-list li span:nth-child(2) {
    float: left;
    text-align: left;
    line-height: 32px;
    font-size: 14px;
    color: #333;
}