/* 基础设置 */
    :root {
        --brand-blue: #1D2088;
        --bg-color: #f9f9f9;
        --text-dark: #333333;
        --text-gray: #666666;
    }

    body {
        font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
        background-color: var(--bg-color);
        margin: 0;
        padding: 20px;
    }

    .faq-section {
        max-width: 900px;
        margin: 0 auto;
        padding: 40px 20px;
    }

    .faq-header {
        text-align: center;
        margin-bottom: 40px;
        color: var(--brand-blue);
        font-size: 2.5rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 1px;
    }

    /* FAQ 卡片样式 - 浮起效果 */
    .faq-item {
        background-color: #ffffff;
        border-radius: 8px;
        margin-bottom: 25px;
        /* 核心浮起阴影 */
        box-shadow: 0 4px 15px rgba(29, 32, 136, 0.08); 
        transition: all 0.3s ease;
        overflow: hidden;
        position: relative;
    }

    /* 左侧品牌色装饰条 */
    .faq-item::before {
        content: '';
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        width: 5px;
        background-color: var(--brand-blue);
        border-top-left-radius: 8px;
        border-bottom-left-radius: 8px;
    }

    /* 鼠标悬停时的上浮动画 */
    .faq-item:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 25px rgba(29, 32, 136, 0.15);
    }

    /* 折叠面板样式 */
    details {
        padding: 25px 30px;
        cursor: pointer;
        transition: all 0.3s ease;
    }

    summary {
        list-style: none;
        display: flex;
        justify-content: space-between;
        align-items: center;
        font-size: 1.2rem;
        font-weight: 600;
        color: var(--text-dark);
        outline: none;
    }

    /* 隐藏默认的小三角 */
    summary::-webkit-details-marker {
        display: none;
    }

    /* 自定义加号图标 */
    summary::after {
        content: '+';
        color: var(--brand-blue);
        font-size: 1.5rem;
        font-weight: bold;
        transition: transform 0.3s ease;
    }

    /* 展开状态的样式 */
    details[open] summary::after {
        transform: rotate(45deg); /* 打开时旋转变成叉号 */
    }

    details[open] summary {
        margin-bottom: 15px;
        border-bottom: 1px solid #eee;
        padding-bottom: 15px;
    }

    .faq-answer {
        color: var(--text-gray);
        line-height: 1.6;
        font-size: 1rem;
        /* 简单的淡入动画 */
        animation: fadeIn 0.5s ease;
    }

    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(-5px); }
        to { opacity: 1; transform: translateY(0); }
    }

    /* 移动端适配 */
    @media (max-width: 600px) {
        .faq-item {
            margin-bottom: 15px;
        }
        details {
            padding: 20px;
        }
        summary {
            font-size: 1rem;
        }
    }