.chart-section { background: #f8fafc; padding: 4rem 0; }
.chart-card { background: #fff; border-radius: 16px; padding: 1rem; box-shadow: 0 12px 32px rgba(0,0,0,.08); }
.chart-legend { margin-top: .75rem; font-size: .9rem; color: #334155; }