.white-nav .head .nav li .about{
    border-bottom: 2px solid #fff;
}
.black-nav .head .nav li .about{
    border-bottom: 2px solid #111;
}
#page1{
    background-image: url("../images/bg/2_about_1.jpg");
    background-position-y: top;
}
#page2{
    background-image: url("../images/bg/2_about_2.jpg");
}
#page3{
    background-image: url("../images/bg/2_about_3.jpg");
}
#page4{
    background-image: url("../images/bg/2_about_4.jpg");
}
#page5{
    background-image: url("../images/bg/2_about_5.jpg");
}


#page1 .text{
    position: absolute;
    top: calc(calc(var(--real-vh, 1vh) * 100) * 250 / 1080);
    left: calc(100vw * 300 / 1920);
}
#page1 .text .company{
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 50 / 1080);
    /*font-size: clamp(25px, 3vw, 60px);*/
    line-height: 1;
    font-weight: 400;
    margin-bottom: calc(calc(var(--real-vh, 1vh) * 100) * 28 / 1080);
    color: #fff;
}
#page1 .text .sm{
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 28 / 1080);
    color: #FFFFFF;
    font-weight: 300;
    line-height: 1.5;
}

#page2 .text{
    position: absolute;
    top: calc(calc(var(--real-vh, 1vh) * 100) * 257 / 1080);
    right: calc(100vw * 205 / 1920);
}
#page2 .text .company{
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 50 / 1080);
    /*font-size: clamp(25px, 3vw, 60px);*/
    font-weight: 400;
    line-height: 1;
    margin-bottom: calc(calc(var(--real-vh, 1vh) * 100) * 37 / 1080);
    text-align: justify;
    color: #fff;
    display: flex;
    align-items: center;
    vertical-align: middle;
}
#page2 .text .sm{
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 24 / 1080);
    color: #FFFFFF;
    font-family: Microsoft YaHei;
    font-weight: 300;
    letter-spacing: normal;
    line-height: 1.5;
    text-align: justify;
    margin-bottom: calc(calc(var(--real-vh, 1vh) * 100) * 11 / 1080);
    width: calc(calc(var(--real-vh, 1vh) * 100) * 609 / 1080);
}
#page2 .text .go-more{
    width: calc(calc(var(--real-vh, 1vh) * 100) * 150 / 1080);
    /*min-width: 164px;*/
    height: calc(calc(var(--real-vh, 1vh) * 100) * 52 / 1080);
    background: linear-gradient(90deg, #3A87CD, #75BDFF);;
    border-radius: calc(calc(var(--real-vh, 1vh) * 100) * 26 / 1080);
    margin-left: calc(100vw * 60 / 1980);
    display: flex;
    justify-content: center;
    align-items: center;
    vertical-align: middle;
    cursor: pointer;
}
#page2 .text .go-more span{
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 20 / 1080);
    color: #fff;
    margin-right: calc(calc(var(--real-vh, 1vh) * 100) * 21 / 1080);
}
#page2 .text .go-more img{
    display: inline-block;
    width: calc(calc(var(--real-vh, 1vh) * 100) * 37 / 1080);
    height: calc(calc(var(--real-vh, 1vh) * 100) * 37 / 1080);
}

#page3 .text{
    margin-top: calc(calc(var(--real-vh, 1vh) * 100) * 137 / 1080);
    margin-left: calc(100vw * 200 / 1920);
}
#page3 .text .company{
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 50 / 1080);
    /*font-size: clamp(25px, 3vw, 60px);*/
    font-weight: 400;
    margin-bottom: calc(calc(var(--real-vh, 1vh) * 100) * 90 / 1080);
    color: #111111;
}
#page3 .text .text-item{
}
#page3 .text .text-item .item{
    float: left;
    margin-right: calc(100vw * 80 / 1920);
}
#page3 .text .text-item .item .title{
    font-family: Microsoft YaHei;
    font-weight: 400;
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 28 / 1080);
    color: #111111;
    margin-bottom: calc(calc(var(--real-vh, 1vh) * 100) * 25 / 1080);
}
#page3 .text .text-item .item .exp{
    font-family: Microsoft YaHei;
    font-weight: 300;
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 20 / 1080);
    height: calc(calc(var(--real-vh, 1vh) * 100) * 20 / 1080);
    color: #111111;
    text-align: justify;
    margin-bottom: calc(calc(var(--real-vh, 1vh) * 100) * 10 / 1080);
}
#page3 .text .text-item .item .exp:after{
    content: '';
    display: inline-block;
    width: 100%;
}
#page4 .text{
    position: absolute;
    top: calc(calc(var(--real-vh, 1vh) * 100) * 280 / 1080);
    left: calc(100vw * 200 / 1920);
}
#page4 .text .company{
    font-family: Microsoft YaHei;
    font-weight: 400;
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 50 / 1080);
    color: #111111;
    margin-bottom: calc(calc(var(--real-vh, 1vh) * 100) * 120 / 1080);
    width: calc(calc(var(--real-vh, 1vh) * 100) * 1520 / 1080);
}
#page4 .text .history{

}
#page4 .text .history .time{
    margin-top: calc(calc(var(--real-vh, 1vh) * 100) * -12 / 1080);
    float: left;
}
#page4 .text .history .line{
    height: calc(calc(var(--real-vh, 1vh) * 100) * 427 / 1080);
    width: 1px;
    background: #8E8E8E;
    margin-left: calc(100vw * 80 / 1920);
    float: left;
    margin-top: calc(calc(var(--real-vh, 1vh) * 100) * 4 / 1080);
}
#year-container {
    width: calc(100vw * 120 / 1920);
    height: calc(calc(var(--real-vh, 1vh) * 100) * 460 / 1080);
    overflow: hidden;
    position: relative;
    user-select: none;
    cursor: grab;
    padding-right: calc(100vw * 70 / 1920);
}
#year-scroll{
    position: relative;
    transition: transform 0.3s ease-out;
}
.year-item {
    font-family: Microsoft YaHei;
    font-weight: 300;
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 24 / 1080);
    color: #8E8E8E;
    height: calc(calc(var(--real-vh, 1vh) * 100) * 50 / 1080);
    display: flex;
    align-items: center;
    justify-content: center;
}
.year-item.selected {
    font-family: Microsoft YaHei;
    font-weight: 400;
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 44 / 1080);
    color: #111111;
    line-height: calc(calc(var(--real-vh, 1vh) * 100) * 60 / 1080);
    background: linear-gradient(0deg, #3A87CD 0%, #75BDFF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
    height: calc(calc(var(--real-vh, 1vh) * 100) * 60 / 1080);
}
.year-item.selected::after{
    content: ""; /* 必须设置content属性，否则伪元素不会显示 */
    position: absolute; /* 绝对定位相对于父元素 */
    right: calc(-100vw * 40 / 1920); /* 根据需要调整位置 */
    top: 50%; /* 垂直居中 */
    transform: translateY(-50%); /* 确保三角形在文字的垂直中心 */
    width: calc(100vw * 16 / 1920);
    height: calc(100vw * 18 / 1920);
    background: url("../images/trag.png") no-repeat center center;
    background-size: cover;

}
#page4 .history-item{
    float: left;
}
#page4 .history-item .item{
    margin-left: calc(100vw * 81 / 1980);
    animation: opacityAnimation linear 0.5s; /* 应用opacityAnimation动画，持续2秒，无限次播放 */
    display: none;
    justify-content: center;
    align-items: center;
    height: calc(calc(var(--real-vh, 1vh) * 100) * 427 / 1080);
}
#page4 .history-item .item .txt-title{
    float: left;
    /*margin-top: calc(calc(var(--real-vh, 1vh) * 100) * 100 / 1080);*/
    margin-right: calc(100vw * 112 / 1920);
    /*width: calc(100vw * 436 / 1920);*/
}
#page4 .history-item .item .txt-title .sub-title{
    color: #111;
    font-family: Microsoft YaHei;
    font-weight: 300;
    font-size: min(calc(calc(var(--real-vh, 1vh) * 100) * 24 / 1080),calc(100vw * 24 / 1920));
    margin-bottom: calc(calc(var(--real-vh, 1vh) * 100) * 34 / 1080);
    letter-spacing: 1px;
    line-height: 1.5;

}
#page4 .history-item .item .txt-title .sub-title:last-child{
    margin-bottom: 0;
}
#page4 .history-item .item img{
    height: min(calc(calc(var(--real-vh, 1vh) * 100) * 440 / 1080),calc(100vw * 440 / 1920));
    float: left;
}

#page5 .text{
    position: absolute;
    top: calc(calc(var(--real-vh, 1vh) * 100) * 223 / 1080);
    right: calc(100vw * 200 / 1920);
}
#page5 .text .company{
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 50 / 1080);
    /*font-size: clamp(25px, 3vw, 60px);*/
    line-height: 1;
    margin-bottom: calc(calc(var(--real-vh, 1vh) * 100) * 40 / 1080);
    color: #111;
    display: flex;
    /*justify-content: center;*/
    align-items: center;
    vertical-align: middle;
    font-weight: 400;
}
#page5 .text .sm{
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 24 / 1080);
    width:calc(calc(var(--real-vh, 1vh) * 100) * 674 / 1080);
    color: #111;
    font-weight: 300;
    line-height: 1.5;
    text-align: justify;
    margin-bottom: calc(calc(var(--real-vh, 1vh) * 100) * 5 / 1080);
}

#page5 .text .go-more{
    width: calc(calc(var(--real-vh, 1vh) * 100) * 150 / 1080);
    /*min-width: 164px;*/
    height: calc(calc(var(--real-vh, 1vh) * 100) * 52 / 1080);
    background: linear-gradient(90deg, #3A87CD, #75BDFF);;
    border-radius: calc(calc(var(--real-vh, 1vh) * 100) * 26 / 1080);
    margin-left: calc(100vw * 60 / 1980);
    display: flex;
    justify-content: center;
    align-items: center;
    vertical-align: middle;
    cursor: pointer;
}
#page5 .text .go-more span{
    font-size: calc(calc(var(--real-vh, 1vh) * 100) * 20 / 1080);
    color: #fff;
    margin-right: calc(calc(var(--real-vh, 1vh) * 100) * 22 / 1080);
}
#page5 .text .go-more img{
    display: inline-block;
    width: calc(calc(var(--real-vh, 1vh) * 100) * 36 / 1080);
    height: calc(calc(var(--real-vh, 1vh) * 100) * 36 / 1080);
}