.topic-btn.active{color:#fff;background-color:#2563eb;box-shadow:0 4px 12px #2563eb4d}.rule-card{animation:.4s ease-out forwards slideRight;display:none}.rule-card.active{display:block}@keyframes slideRight{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}