/* 全局重置，消除默认边距 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* 让body占满整个屏幕，并用Flex实现内容垂直+水平居中 */
        body {
            width: 100vw;
            height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            font-family: "Microsoft Yahei";
            padding: 20px;
        }

        h2 {
            margin-bottom: 30px;
            text-align: center;
        }

        /* 下载按钮基础样式 */
        .download-btn {
            display: inline-block;
            padding: 12px 40px;
            background: #0078d7;
            color: white;
            text-decoration: none;
            border-radius: 4px;
            cursor: not-allowed;
            opacity: 0.5;
            pointer-events: none;
            text-align: center;
            line-height: 1;
            border: none;
            /* 兼容button标签 */
            font-family: inherit;
            /* 兼容button标签 */
            font-size: inherit;
            /* 兼容button标签 */
        }

        .download-btn.enabled {
            cursor: pointer;
            opacity: 1;
            pointer-events: auto;
        }

        .download-btn:hover {
            background: #005a9e;
        }

        /* 浏览器误报提示语 */
        .tips-text {
            color: #666;
            font-size: 13px;
            line-height: 1.5;
            text-align: center;
            margin: 10px 0;
            padding: 8px 20px;
            background: #f5f5f5;
            border-radius: 4px;
            max-width: 400px;
        }

        /* 状态提示文本 */
        .status-text {
            color: #666;
            font-size: 14px;
            margin-top: 5px;
            display: none;
            text-align: center;
        }

        /* ------------------------------ */
        /* 【CSS 仅负责美化】移动端样式放大 */
        /* ------------------------------ */
        @media (max-width: 768px) {
            h2 {
                font-size: 1.25rem;
                margin-bottom: 24px;
                width: 100%;
            }

            /* 移动端按钮：宽度100%，更易点击 */
            .download-btn {
                display: block;
                width: 100%;
                max-width: 400px;
                padding: 16px 20px;
                font-size: 1.1rem;
            }

            /* 移动端提示框：宽度100% */
            .tips-text {
                width: 100%;
                max-width: 400px;
                font-size: 14px;
                padding: 12px 16px;
            }

            .status-text {
                font-size: 15px;
            }
        }