.interactive-box{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:white;padding:30px;border-radius:15px;margin:30px 0;box-shadow:0 10px 30px rgba(0,0,0,.2)}.interactive-box h3{margin-top:0;font-size:1.5em;color:white}.flip-card.flipped .flip-card-inner{transform:rotateY(180deg)}.tracker-action.completed{background:#d4edda;border-color:#28a745}