.hidden { display: none; }
.multi-site-popup { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: white; padding: 20px; border: 1px solid #ccc; z-index: 1000; width: 400px; }
.popup-content { position: relative; }
.close-btn { position: absolute; top: 10px; right: 10px; cursor: pointer; }