.animate-gradient{background-size:400% 400%;animation:gradient 25s ease infinite}@keyframes gradient{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}.topic-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;margin:40px 0}.topic-card{background:#f5f7fa;padding:24px;border-radius:8px;text-decoration:none;transition:.2s;border:1px solid #e3e6eb}.topic-card:hover{transform:translateY(-3px);box-shadow:0 6px 18px rgba(0,0,0,0.08)}.topic-card h3{margin-bottom:8px;font-size:18px}