/* ================= 基础重置与全局样式 ================= */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: #f7f8fa;
            color: #333;
            line-height: 1.6;
            padding: 40px 20px;
        }

        .layout {
            max-width: 800px;
            margin: 0 auto;
        }

        /* ================= 标题区域样式 ================= */
        .index_hd {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 30px;
            padding-bottom: 15px;
            border-bottom: 2px solid #eaeaea;
        }

        .hd_title {
            font-size: 24px;
            font-weight: 600;
            color: #1a1a1a;
        }

        .item_img img {
            height: 32px;
            width: auto;
        }

        /* ================= FAQ 列表与单项样式 ================= */
        .mdev-faq-list-group {
            display: flex;
            flex-direction: column;
            gap: 12px; /* 卡片之间的间距 */
        }

        .mdev-faq-box-isolated {
            background: #ffffff;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
            border: 1px solid #eef0f3;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .mdev-faq-box-isolated:hover {
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }

        /* 激活状态下的卡片样式 */
        .mdev-faq-box-isolated.active {
            border-color: #d0d7de;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
        }

        /* ================= 问题按钮 (Trigger) ================= */
        .mdev-faq-trigger-btn {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            background: transparent;
            border: none;
            cursor: pointer;
            text-align: left;
            font-family: inherit;
            transition: background-color 0.2s ease;
        }

        .mdev-faq-trigger-btn:hover {
            background-color: #fafbfc;
        }

        .mdev-faq-trigger-btn:focus {
            outline: none;
        }

        .mdev-faq-trigger-btn h4 {
            font-size: 16px;
            font-weight: 500;
            color: #333;
            margin: 0;
            flex: 1;
            padding-right: 15px;
            transition: color 0.3s ease;
        }

        .mdev-faq-box-isolated.active .mdev-faq-trigger-btn h4 {
            color: #0056b3; /* 展开时问题文字变色 */
        }

        /* ================= 加号/减号图标 (CSS绘制) ================= */
        .mdev-faq-plus-icon {
            position: relative;
            width: 20px;
            height: 20px;
            flex-shrink: 0;
            transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .mdev-faq-plus-icon::before,
        .mdev-faq-plus-icon::after {
            content: '';
            position: absolute;
            background-color: #666;
            border-radius: 2px;
            transition: background-color 0.3s ease;
        }

        /* 横线 */
        .mdev-faq-plus-icon::before {
            width: 100%;
            height: 2px;
            top: 50%;
            left: 0;
            transform: translateY(-50%);
        }

        /* 竖线 */
        .mdev-faq-plus-icon::after {
            width: 2px;
            height: 100%;
            left: 50%;
            top: 0;
            transform: translateX(-50%);
        }

        /* 激活时旋转45度变成乘号(×) */
        .mdev-faq-box-isolated.active .mdev-faq-plus-icon {
            transform: rotate(45deg);
        }

        .mdev-faq-box-isolated.active .mdev-faq-plus-icon::before,
        .mdev-faq-box-isolated.active .mdev-faq-plus-icon::after {
            background-color: #0056b3;
        }

        /* ================= 答案内容面板 (Panel) ================= */
        .mdev-faq-body-panel {
            max-height: 0;
            overflow: hidden;
            /* 使用 cubic-bezier 让展开/折叠动画更自然 */
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1); 
        }

        .mdev-faq-inner-content {
            padding: 0 24px 20px 24px;
            color: #666;
            font-size: 15px;
            line-height: 1.7;
            border-top: 1px solid #f0f2f5;
            padding-top: 16px;
        }

        /* ================= 响应式适配 ================= */
        @media (max-width: 600px) {
            body {
                padding: 20px 10px;
            }
            .mdev-faq-trigger-btn {
                padding: 15px 18px;
            }
            .mdev-faq-trigger-btn h4 {
                font-size: 15px;
            }
            .mdev-faq-inner-content {
                padding: 0 18px 18px 18px;
                font-size: 14px;
            }
        }