* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: Arial, sans-serif;
        }
        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 30px;
        }
        /* 标题样式 —— 居中 + 无下划线 */
        .section-title {
            font-size: 34px;
            font-weight: bold;
            color: #000000;
            margin: 40px 0 20px;
            text-align: center;
        }
        .section-desc {
            font-size: 20px;
            color: #000000;
            margin-bottom: 30px;
            line-height: 1.6;
            text-align: center;
        }
        /* 网格布局 */
        .grid-box {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
            margin-bottom: 30px;
        }
        /* 卡片样式 */
        .grid-item {
            background: #ffffff;
            padding: 28px;
            border-radius: 12px;
            border: 1px solid #d0d8e2;
            box-shadow: 0 3px 15px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
        }
        .grid-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
            border-color: #a0aec0;
        }
        .grid-item h4 {
            font-size: 22px;
            color: #000000;
            margin-bottom: 15px;
            font-weight: 60px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .grid-item p {
            font-size: 18px;
            color: #000000;
            line-height: 1.6;
        }
        /* 列表样式 */
        .grid-item ul {
            padding-left: 22px;
            font-size: 18px;
            color: #000000;
            line-height: 1.7;
        }
        /* 响应式适配手机 */
        @media (max-width: 768px) {
            .grid-box {
                grid-template-columns: repeat(1, 1fr);
            }
            .container {
                padding: 20px;
            }
        }