.chart-container{position:relative;margin:20px auto;height:350px;width:100%;max-width:700px}canvas{background-color:#fff;border-radius:8px}h1,h2,h3{color:#1e3a8a}.math-block{overflow-x:auto;padding:10px 0}.section-box{background-color:#f8fafc;border-left:4px solid #3b82f6;padding:20px;margin:20px 0;border-radius:0 8px 8px 0}.toc-link.active{color:#1e40af;font-weight:700;background-color:#dbeafe;padding:2px 8px;border-radius:4px}.sl-square{width:320px;height:320px}