.quiz-option.selected{background:#667eea;color:white;border-color:#667eea}.quiz-result.show{display:block;animation:fadeIn .5s ease}.calculator-result.show{display:block;animation:fadeIn .5s ease}.progress-item.completed{background:#d4edda}.progress-item.completed .progress-label{text-decoration:line-through;color:#155724}.reveal-content.show{display:block;animation:fadeIn .5s ease}