.material-option.selected{background:rgba(255,255,255,.95);color:#667eea;border-color:#fff}.material-result.active{display:block;animation:fadeInUp .5s ease}.storage-btn.active{background:#fff;color:#f5576c}.storage-result-box.show{display:block;animation:fadeInUp .5s ease}.quiz-answer.correct{background:#4caf50;color:#fff;border-color:#4caf50}.quiz-answer.incorrect{background:#f44336;color:#fff;border-color:#f44336}.quiz-feedback.show{display:block;animation:fadeInUp .5s ease}.age-btn.selected{background:#fff;color:#fa709a}.volume-result.active{display:block;animation:fadeInUp .5s ease}.container-card.added{background:linear-gradient(135deg,#a8edea 0%,#fed6e3 100%);border-style:solid;border-color:#2c3e50}.collection-summary.show{display:block;animation:fadeInUp .5s ease}.budget-option.chosen{background:#fff;color:#66a6ff}.budget-breakdown.visible{display:block;animation:fadeInUp .5s ease}