(function() {
    var d = document.createElement('div');
    d.style.cssText = 'position:fixed;top:0;left:0;background:rgba(0,0,0,0.9);color:#fff;padding:8px;font-size:12px;z-index:999999;max-width:90vw;overflow:auto;';
    d.innerHTML = 'Vue: ' + typeof Vue + '<br>ElementPlus: ' + typeof ElementPlus + '<br>Time: ' + new Date().toLocaleTimeString();
    document.body.appendChild(d);
    console.log('Debug panel injected', d.innerHTML);
})();