*{margin:0;padding:0;box-sizing:border-box}html,body{background:#f8f9fa;color:#333;font-family:'Inter',sans-serif;line-height:1.6}.wiki{max-width:1200px;margin:0 auto;padding:2rem}.header{text-align:center;padding:2rem 0;border-bottom:3px solid #1f77b4;margin-bottom:2rem}.header h1{font-size:2.5rem;color:#1f77b4;margin-bottom:0.5rem}.header p{color:#666}.main{padding:2rem 0}.welcome{text-align:center;padding:2rem;background:#e8f4f8;margin-bottom:3rem;border-radius:4px}.welcome h2{font-size:2rem;color:#1f77b4;margin-bottom:1rem}.welcome p{color:#555}.topics h2{font-size:1.8rem;color:#333;margin-bottom:2rem}.topics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem}.topic-card{background:#fff;padding:1.5rem;border:1px solid #ddd;border-radius:4px;transition:all 300ms;box-shadow:0 2px 4px rgba(0,0,0,0.05)}.topic-card:hover{border-color:#1f77b4;box-shadow:0 4px 8px rgba(31,119,180,0.1)}.topic-card h3{color:#1f77b4;margin-bottom:0.5rem}.topic-card p{color:#666;font-size:0.95rem}.contribute{text-align:center;margin:3rem 0}.btn{padding:1rem 2rem;background:#1f77b4;color:#fff;border:none;font-weight:700;cursor:pointer;border-radius:4px;transition:all 300ms}.btn:hover{background:#1856a0}@media(max-width:768px){.topics-grid{grid-template-columns:1fr}}