@charset "UTF-8";body{margin:0;font-family:Roboto,sans-serif;background-color:#eef1f5;color:#333}.container{max-width:960px;margin:0 auto;padding:20px}.btn{padding:10px 20px;border-radius:5px;cursor:pointer;font-size:1em;transition:background-color .3s ease,transform .2s ease;border:none}.btn-primary{background-color:#4285f4;color:#fff}.btn-primary:hover{background-color:#3367d6;transform:translateY(-2px)}.btn-secondary{background-color:#6c757d;color:#fff;margin-left:10px}.btn-secondary:hover{background-color:#5a6268;transform:translateY(-2px)}.feedback-message{margin-top:20px;padding:15px;border-radius:8px;text-align:center;font-weight:700;font-size:1.1em;box-shadow:0 2px 4px #0000001a}.feedback-message .correct{background-color:#d4edda;color:#155724;border:1px solid #c3e6cb}.feedback-message .incorrect{background-color:#f8d7da;color:#721c24;border:1px solid #f5c6cb}.feedback-message button{margin-top:15px}.loading-spinner,.error-message{text-align:center;margin-top:30px;font-size:1.2em;color:#555}.error-message{color:#dc3545;font-weight:700}