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## ✅ **What's Changed**

| Aspect | Before | After |
|--------|--------|-------|
| **Color System** | Gradient background | Dark theme (`#111827`) with token-based colors |
| **Typography** | Basic styling | Semantic scale (11px–32px) with weight hierarchy |
| **Layout** | Single centered chart | Sidebar + KPI row + chart section |
| **Cards** | White background | Dark cards with subtle borders & shadows |
| **KPI Display** | None | 4 interactive KPI cards with icons |
| **Filters** | Basic checkboxes | Organized filter panel with label hierarchy |
| **Responsiveness** | Limited | Full mobile-first breakpoints (480px, 768px, 1200px) |
| **Accessibility** | Basic | High contrast, semantic HTML, ARIA-ready |
| **Animation** | Bubble growth | Smooth transitions + hover effects |
| **Documentation** | Minimal | Full README + design system guide |

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## 🎯 **How to Use the Style Guide**

### **Add New Charts:**