.quiz-container.active{display:block;animation:slideIn .5s ease}.quiz-option.selected{background:#2ecc71;color:white;border-color:#27ae60}.quiz-option.wrong{background:#e74c3c;color:white;border-color:#c0392b}.reveal-box.show{display:block;animation:fadeIn .5s ease}.thermometer-card.selected{background:#3498db;color:white;border-color:#2980b9}.hidden{display:none}