/* 基础重置与字体 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
            background: #f5f7fb;
            line-height: 1.5;
        }

        /* 模拟原产品背景容器 */
        .product_bg {
            background: #ffffff;
            padding: 40px 0;
            box-shadow: 0 2px 10px rgba(0,0,0,0.02);
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .row {
            display: flex;
            flex-wrap: wrap;
        }

        .col-xs-12 {
            width: 100%;
        }

        /* 新闻中心整体模块 */
        .product_index {
            background: #fff;
            border-radius: 24px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.03);
            transition: all 0.2s;
        }

        /* 头部区域 */
        .product_head {
            text-align: center;
            margin-bottom: 32px;
            padding-top: 12px;
        }

        .product_head h2 {
            font-size: 32px;
            font-weight: 700;
            color: #1e2a3a;
            letter-spacing: -0.3px;
            position: relative;
            display: inline-block;
            padding-bottom: 12px;
        }

        .product_head h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, #2c7da0, #4a9eff);
            border-radius: 4px;
        }

        /* 新闻列表 - 网格布局优雅展示 */
        .news_index {
            list-style: none;
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
            margin-top: 10px;
            transition: all 0.3s ease;
        }

        /* 单个新闻条目卡片样式 */
        .news_index li {
            background: #fefefe;
            border-radius: 20px;
            padding: 20px 24px;
            transition: all 0.25s ease-in-out;
            border: 1px solid #eef2f6;
            box-shadow: 0 2px 5px rgba(0,0,0,0.02);
            display: flex;
            flex-direction: column;
        }

        .news_index li:hover {
            border-color: #d4e2f0;
            box-shadow: 0 12px 24px -12px rgba(0, 0, 0, 0.08);
            transform: translateY(-2px);
        }

        /* 日期区域样式 (左侧风格) */
        .news_index li span {
            display: inline-flex;
            align-items: baseline;
            gap: 8px;
            background: rgba(247, 176, 156, 0.5);
            padding: 6px 14px;
            border-radius: 40px;
            width: fit-content;
            margin-bottom: 16px;
            font-weight: 500;
        }

        .news_index li span strong {
            font-size: 26px;
            font-weight: 800;
            color: #1e4663;
            line-height: 1;
        }

        .news_index li span i {
            font-style: normal;
            font-size: 14px;
            color: #5c6f87;
            letter-spacing: 0.3px;
        }

        /* 标题链接 */
        .news_index li a {
            font-size: 1.8rem;
            font-weight: 700;
            color: #0b2b42;
            text-decoration: none;
            transition: color 0.2s;
            line-height: 1.4;
            margin: 8px 0 6px 0;
            display: inline-block;
        }

        .news_index li a:hover {
            color: #2c7da0;
            text-decoration: underline;
        }

        /* 摘要描述 */
        .news_index li em {
            font-style: normal;
            color: #4a5b6e;
            font-size: 1.5rem;
            line-height: 1.5;
            margin-top: 8px;
            display: block;
            border-top: 1px dashed #e9edf2;
            padding-top: 12px;
        }

        /* 隐藏状态 (js控制折叠) */
        .news_item.hidden-news {
            display: none;
        }

        /* 展开更多按钮容器 */
        .more-btn-wrapper {
            text-align: center;
            margin-top: 48px;
            margin-bottom: 20px;
        }

        .btn-expand {
            background: transparent;
            border: 1.5px solid #cbdde9;
            padding: 12px 36px;
            font-size: 1.8rem;
            font-weight: 600;
            color: #2c7da0;
            border-radius: 48px;
            cursor: pointer;
            transition: all 0.25s;
            background-color: #ffffff;
            box-shadow: 0 1px 2px rgba(0,0,0,0.02);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-expand:hover {
            background: #eef5fc;
            border-color: #2c7da0;
            color: #1a5d7a;
            box-shadow: 0 6px 12px -8px rgba(44,125,160,0.2);
            transform: scale(1.01);
        }

        .btn-expand:active {
            transform: scale(0.98);
        }

        /* 展开后，如果已经显示所有，按钮文案变化，但无需额外操作 */
        /* 移动端适配 */
        @media (max-width: 768px) {
            .news_index {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .product_head h2 {
                font-size: 28px;
            }
            .news_index li {
                padding: 18px;
            }
            .btn-expand {
                padding: 10px 28px;
                font-size: 0.9rem;
            }
        }

        /* 可选: 动画平滑过渡 */
        .news_index {
            overflow: hidden;
        }