/* 适用于移动端 */
@media (max-width:768px) {
    .banner-pc {
        display: none;
    }

    .layout {
        display: flex;
        flex-direction: column;
    }

    .layout .about-navigation {
        margin-top: 20px;
        width: 100%;
        position: sticky;
        /* 使用sticky定位 */
        top: 0;
        /* 当滚动到顶部时固定 */
        z-index: 1000;
        /* 确保导航栏在最上层 */
        background-color: #fff;
        /* 背景色 */
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        /* 添加阴影效果 */
        display: flex;
        /* 使用flex布局 */
        justify-content: space-around;
        /* 均匀分布导航项 */
        align-items: center;
        /* 调整内边距 */
        height: 60px;
        /* 固定高度 */
        /* 添加过渡效果，使位置变化更平滑 */
        transition: top 0.5s ease;

        /* 初始top值，将在JavaScript中动态设置 */
        top: 0;
    }

    .layout .about-navigation .about-nav-item {
        padding-bottom: 10px;
        display: inline-block;
        font-size: 16px;
        color: #8B8B99;
        line-height: 18px;
        border-bottom: 3px solid transparent;
        text-align: center;
        /* 文字居中 */
        transition: color 0.3s ease, border-color 0.3s ease;
        /* 添加过渡效果 */
    }

    .layout .about-navigation span.current {
        color: #2C2D3F;
        border-bottom: 3px solid #2C6BFC;
    }

    .layout .about-navigation span.current::after {
        display: none;
    }

    .layout .main {
        position: relative;
        width: 100%;
        padding: 20px 20px 0;
        margin-top: 0;
        /* 去掉上边距 */
    }

    .section {
        padding: 20px 0;
    }

    .section .section-title {
        margin-bottom: 20px;
        padding: 0;
        width: 100%;
        font-size: 16px;
        color: #2C2D3F;
    }

    .section-p {
        margin-bottom: 16px;
    }

    .section-p {
        font-size: 15px;
        color: #7E7F8E;
    }

    .section-p .circle {
        margin-right: 15px;
        display: inline-block;
        margin-bottom: 3px;
        width: 6px;
        height: 6px;
        background: #2C6BFC;
        border-radius: 50%;
    }

    .section-p .black {
        color: #2C2D3F;
    }

    .section .border {
        margin-top: 30px;
        width: 100%;
        height: 2px;
        background: linear-gradient(90deg, #2C6BFC 0%, #B3A7FB 100%);
        border: none !important;
    }

    .timeline {
        margin-top: 30px;
    }

    .timeline-item {
        display: flex;
    }

    .timeline-year {
        flex-shrink: 0;
        position: relative;
        width: 62px;
    }

    .timeline-year-val {
        position: absolute;
        top: -9px;
        font-weight: bold;
        font-size: 18px;
        color: #2C6BFC;
        line-height: 18px;
    }

    .timeline-item:last-child .timeline-content {
        padding-bottom: 0;
        border-left: 1px dashed #D9E5FF;
    }

    .timeline-content {
        position: relative;
        padding-left: 20px;
        padding-bottom: 34px;
        border-left: 1px solid #D9E5FF;
    }

    .timeline-content-icon {
        position: absolute;
        top: -6px;
        left: -6.5px;
        width: 12px;
    }

    .timeline-content-title {
        position: absolute;
        top: -8px;
        font-size: 16px;
        color: #2C2D3F;
        line-height: 16px;
    }

    .timeline-content-p {
        margin-top: 30px;
        font-size: 14px;
        color: #7E7F8E;
    }

    .timeline-content-p .bold {
        font-weight: bold;
        color: #2C2D3F;
    }

    .culture-items {
        margin-left: 22px;
        margin-top: 30px;
    }

    .culture-item {
        position: relative;
        margin-bottom: 30px;
    }

    .culture-item-icon1 {
        position: absolute;
        left: -22px;
        top: -14px;
        width: 32px;
    }

    .culture-item-icon2 {
        position: absolute;
        left: -22px;
        top: -14px;
        width: 31px;
    }

    .culture-item-icon3 {
        position: absolute;
        left: -22px;
        top: -14px;
        width: 24px;
    }

    .culture-item-title {
        font-size: 16px;
        color: #2C6BFC;
        line-height: 25px;
    }

    .culture-item-content {
        margin-top: 5px;
        font-size: 15px;
        color: #7E7F8E;
    }
}

@media (min-width:768px) and (max-width:992px) {
    .layout {
        max-width: 768px;
    }

    .layout .about-navigation {
        width: 186px;
    }

    .layout .main {
        width: 582px;
    }
}

@media (min-width:992px) and (max-width:1200px) {
    .layout {
        max-width: 992px;
    }

    .layout .about-navigation {
        width: 240px;
    }

    .layout .main {
        width: 752px;
    }
}

@media (min-width:1200px) {
    .layout {
        max-width: 1200px;
    }

    .layout .about-navigation {
        width: 290px;
    }

    .layout .main {
        width: 910px;
    }
}

/* 除移动端的屏幕 */
@media (min-width:768px) {
    .banner-moblie {
        display: none;
    }

    .layout {
        margin: 0 auto;
        padding: 90px 0 0;
        /* max-width: 1200px; */
        display: flex;
        height: 100vh;
        /* 使布局容器占满整个视口高度 */
        overflow: hidden;
        /* 隐藏布局容器的滚动条 */
    }

    .layout .about-navigation {
        /* width: 290px; */
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        align-items: flex-start;
    }

    .layout .about-navigation .about-nav-item {
        padding-left: 10px;
        display: block;
        margin-bottom: 40px;
        font-size: 18px;
        color: #8B8B99;
        line-height: 18px;
        border-left: 3px solid transparent;
        /* 添加过渡效果 */
        transition: color 0.3s ease, border-color 0.3s ease;
        /* 确保边框变化不影响布局 */
        box-sizing: border-box;
        cursor: pointer;
    }

    .layout .about-navigation span.current {
        color: #2C2D3F;
        border-left: 3px solid #2C6BFC;
    }

    .layout .about-navigation span.current::after {
        display: none;
    }

    .layout .main {
        padding-bottom: 200px;
        /* position: relative; */
        /* width: 910px; */
        height: 100%;
        /* 主内容区域占满剩余高度 */
        overflow-y: auto;
        /* 允许主内容区域垂直滚动 */
        padding-right: 20px;
        /* 为滚动条留出空间 */
        scroll-behavior: smooth;
        /* 添加平滑滚动效果 */

        /* 隐藏滚动条 */
        scrollbar-width: none;
        /* Firefox */
        -ms-overflow-style: none;
        /* IE and Edge */
    }

    .section {
        margin-bottom: 50px;
        padding: 0;
    }

    .section .section-title {
        margin-bottom: 20px;
        padding: 0;
        width: 100%;
        font-size: 20px;
        color: #2C2D3F;
        text-align: left;
    }

    .section-p {
        margin-bottom: 16px;
    }

    .section-p {
        font-size: 15px;
        color: #7E7F8E;
    }

    .section-p .circle {
        margin-bottom: 3px;
        margin-right: 15px;
        display: inline-block;
        width: 6px;
        height: 6px;
        background: #2C6BFC;
        border-radius: 50%;
    }

    .section-p .black {
        color: #2C2D3F;
    }

    .section .border {
        margin-top: 50px;
        width: 100%;
        height: 2px;
        background: linear-gradient(90deg, #2C6BFC 0%, #B3A7FB 100%);
        border: none !important;
    }

    .timeline {
        margin-top: 55px;
    }

    .timeline-item {
        display: flex;
    }

    .timeline-year {
        flex-shrink: 0;
        position: relative;
        width: 62px;
    }

    .timeline-year-val {
        position: absolute;
        top: -9px;
        font-weight: bold;
        font-size: 18px;
        color: #2C6BFC;
        line-height: 18px;
    }

    .timeline-item:last-child .timeline-content {
        padding-bottom: 0;
        border-left: 1px dashed #D9E5FF;
    }

    .timeline-content {
        position: relative;
        padding-left: 20px;
        padding-bottom: 34px;
        border-left: 1px solid #D9E5FF;
    }

    .timeline-content-icon {
        position: absolute;
        top: -6px;
        left: -6.5px;
        width: 12px;
    }

    .timeline-content-title {
        position: absolute;
        top: -8px;
        font-size: 16px;
        color: #2C2D3F;
        line-height: 16px;
    }

    .timeline-content-p {
        margin-top: 30px;
        font-size: 14px;
        color: #7E7F8E;
    }

    .timeline-content-p .bold {
        font-weight: bold;
        color: #2C2D3F;
    }

    .culture-items {
        margin-left: 50px;
        margin-top: 95px;
    }

    .culture-item {
        position: relative;
        margin-bottom: 85px;
    }

    .culture-item-icon1 {
        position: absolute;
        left: -50px;
        top: -40px;
        width: 72px;
    }

    .culture-item-icon2 {
        position: absolute;
        left: -50px;
        top: -40px;
        width: 68px;
    }

    .culture-item-icon3 {
        position: absolute;
        left: -50px;
        top: -40px;
        width: 53px;
    }

    .culture-item-title {
        font-size: 24px;
        color: #2C6BFC;
        line-height: 35px;
    }

    .culture-item-content {
        margin-top: 13px;
        font-size: 15px;
        color: #7E7F8E;
    }
}

body {
    background: #FFFFFF;
}