.quiz-option.selected{background:#4caf50;color:white;border-color:#2e7d32}.result-box.show{display:block;animation:slideIn .5s ease}.reveal-content.show{display:block;animation:fadeIn .5s ease}.checklist-item.checked{background:#c8e6c9;text-decoration:line-through;opacity:.7}.checkbox.checked::after{content:"✓";color:#2e7d32;font-weight:700;font-size:1.2em}