.demo-content{max-width:800px;margin:0 auto;background:#fff;padding:30px;border-radius:12px;box-shadow:0 2px 10px rgba(0,0,0,.1);text-align:center}.installer-popup-overlay.show{visibility:visible;opacity:1}#popup-contact-form input,#popup-contact-form textarea{width:100%;padding:10px;margin-bottom:15px;border:1px solid #ddd;border-radius:5px;font-family:inherit;box-sizing:border-box}.installer-btn{background:#2271b1;color:#fff;border:none;padding:10px 20px;border-radius:5px;cursor:pointer;width:100%}.installer-btn:hover{background:#135e96}.form-message{margin-top:15px;font-size:14px;text-align:center}.form-message.success{color:#00a32a}.form-message.error{color:#d63638}