* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-box-sizing: border-box;
            -moz-box-sizing: border-box;
            writing-mode: horizontal-tb;
            text-orientation: mixed;
            /* 完善字体备选列表，兼容多浏览器 */
            font-family: "MiSans-Regular";
            /* 消除元素默认高亮，提升一致性 */
            -webkit-tap-highlight-color: transparent;
        }

        body {
            margin: 0;
            padding: 0;
            background-color: #fff;
            color: #333;
            line-height: 1.6;
            width: 100%;
            overflow-x: hidden;
            -webkit-overflow-scrolling: touch;
            direction: ltr;
        }

        .main-content {
            width: 100%;
            position: relative;
        }


        .sub-nav {
            width: 80%;
            background-color: #f5f5f5;
            z-index: 90;
			margin:50px auto 0 auto;
        }

        .sub-nav-container {
            width: 100%;
            max-width: 1520px;
            margin: 0 auto;
            display: -webkit-box;
            display: -moz-box;
            display: -ms-flexbox;
            display: -webkit-flex;
            display: flex;
            -webkit-box-pack: stretch;
            -moz-box-pack: stretch;
            -ms-flex-pack: stretch;
            -webkit-justify-content: stretch;
            justify-content: stretch;
            flex-direction: row;
            flex-wrap: nowrap;
        }

        .sub-nav-item {
            -webkit-box-flex: 1;
            -webkit-flex: 1;
            -ms-flex: 1;
            flex: 1;
            text-align: center;
            padding: 12px 0;
            text-decoration: none;
            color: #47d1c3;
            font-size: 16px;
            font-weight: 500;
            transition: all 0.3s;
            border: none;
            border-right: 1px solid #e0e0e0;
            display: block;
            position: relative;
            zoom: 1;
            white-space: nowrap;
        }

        .sub-nav-item:last-child {
            border-right: none;
        }

        .sub-nav-item.active {
            color: #fff;
            background-color: #47d1c3;
        }

        .sub-nav-item:hover {
            color: #fff;
            background-color: #47d1c3;
        }

        /* ======================================
           发展历史时间线样式
           ====================================== */
        .history-section {
            padding: 80px 0;
        }

        .history-container {
            max-width: 1000px;
            width: 80%;
            margin: 0 auto;
            padding:0 40px;
            background-color: #ffffff;
            font-size: 16px;
        }

		.history-container-all{ width:80%; max-width:1520px; margin: 0 auto;}
		
		.history-title{
            font-size: clamp(24px, 3vw, 36px);
			font-size:36px;
            font-weight: 500;
            color: #47d1c3;
			width:1520px;
			width:100%;
            margin:0 auto;
            line-height: 1;
            letter-spacing: 1px;
        }
		.history-subtitle{
            font-size: clamp(18px, 2vw, 25px);
			font-size:25px;
            font-weight: 400;
            color: #333333;
			width:1520px;
			width:100%;
            line-height: 1;
            letter-spacing: 0.5px;
            margin:15px auto 35px auto;
        }

        /* 时间线列表 */
        .timeline-list {
			width:80%;
            list-style: none;
            position: relative;
            padding-left: 0;
        }

        /* 时间线虚线（品牌色）- 优化定位兼容 */
        .timeline-list::before {
            content: '';
            position: absolute;
            left: 18px;
            top: 0;
            bottom: 0;
            height: 100%;
            width: 1px;
            border-left: 1px dashed #47d1c3;
            background: transparent;
            z-index: 0;
        }

        /* 时间线项 - 重构布局，兼容QQ浏览器Flex */
        .timeline-item {
            position: relative;
            padding-left: 80px;
            margin-bottom: 40px;
            line-height: 1.8;
            display: block;
            zoom: 1; /* IE/QQ浏览器触发hasLayout */
        }
        /* 现代浏览器保留Flex，QQ浏览器自动降级为块级 */
        @supports (display: flex) {
            .timeline-item {
                display: flex;
                align-items: flex-start;
                gap: 15px;
            }
        }

        /* 时间点圆圈（品牌色边框）- 优化定位 */
        .timeline-item::before {
            content: '';
            position: absolute;
            left: 10px;
            top: 6px;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            border: 1px solid #47d1c3;
            background-color: #fff;
            z-index: 1;
        }

        /* 年份样式（品牌色）- 核心兼容优化 */
        .timeline-year {
            color: #47d1c3;
            font-size: 28px;
            font-weight: 500;
            line-height: 1;
            white-space: nowrap;
            display: inline-block;
            margin-right: 15px;
            margin-bottom: 5px;
            flex-shrink: 0;
        }

        /* 内容样式 - 适配布局 */
        .timeline-content {
            color: #333;
            font-size: 15px;
            line-height: 2;
            padding-left: 20px;
            flex: 1;
            display: inline-block;
            vertical-align: top;
            width: calc(100% - 80px);
        }

        

        /* ======================================
           响应式适配（统一整合）
           ====================================== */
        @media screen and (max-width: 768px) {
            .banner {
                height: 300px;
            }
            .sub-nav-container {
                width: 90%;
                flex-wrap: nowrap;
            }
            .sub-nav-item {
                padding: 10px 0;
                font-size: 14px;
                white-space: nowrap;
                border-right: 1px solid #e0e0e0;
                color: #47d1c3;
            }
            .sub-nav-item:last-child {
                border-right: none;
            }

            /* 发展历史适配 */
            .history-section {
                padding: 40px 0;
            }
            .history-container {
                padding: 20px;
                font-size: 14px;
            }
            .timeline-item {
                padding-left: 60px;
                margin-bottom: 30px;
                display: block !important;
            }
            .timeline-list::before {
                left: 14px;
                top: 0;
                height: 100%;
                border-left: 1px dashed #47d1c3;
            }
            .timeline-item::before {
                left: 6px;
                top: 4px;
                width: 14px;
                height: 14px;
                border: 1px solid #47d1c3;
            }
            .timeline-year {
                font-size: 24px;
                color: #47d1c3;
                display: block;
                margin-right: 0;
                margin-bottom: 8px;
            }
            .timeline-content {
                font-size: 14px;
                width: 100%;
                display: block;
            }

            /* 底部导航适配 */
            .footer {
                padding: 60px 20px 30px 20px;
            }
        }

        /* 大屏适配 */
        @media (min-width: 1200px) {
            .history-container {
                font-size: 18px;
            }
            .timeline-year {
                font-size: 32px;
            }
            .timeline-content {
                font-size: 16px;
            }
        }