# 📋 Design System Audit — File Index

**Generated:** April 21, 2026  
**Scope:** Homepage refactor preparation  
**Status:** ✅ Complete

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## 📄 Three Audit Documents

### 1. **DESIGN_SYSTEM_AUDIT_2026_04_21.md** (680 lines)
**The Complete Reference**

Comprehensive, detailed breakdown of every aspect of the design system:

- **Section 1-7:** Component-by-component documentation (props, features, styling)
- **Section 2:** Complete design token reference (colors, typography, spacing, animations)
- **Section 3:** Full analytics API interface documentation
- **Section 4:** React Query hooks and cache keys
- **Section 5:** Chart components (Recharts implementations)
- **Section 6:** Map components (Mapbox integrations)
- **Section 7:** Map styling and theming
- **Section 8:** Key patterns and best practices
- **Section 9:** Export paths for integration
- **Section 10:** Homepage refactor checklist

**Use this for:** Deep dives, integration planning, architecture decisions

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### 2. **DESIGN_SYSTEM_QUICK_REFERENCE.md** (241 lines)
**The Developer's Cheat Sheet**

Quick lookup and copy-paste code examples:

- **Component Examples:** StatCard, PriceDelta, MarketIndex, DataTable, TickerStrip, DashboardLayout
- **Design Tokens:** Colors, typography, spacing cheat sheet
- **API Usage:** Raw calls and React Query hooks
- **Charts:** Code snippets for each chart type
- **Maps:** Examples of heatmap, listing map, location picker
- **Best Practices:** Do's and don'ts
- **Environment Setup:** Required ENV variables

**Use this for:** Rapid prototyping, code copy-paste, quick lookups

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### 3. **AUDIT_SUMMARY.md** (291 lines)
**The Executive Summary**

High-level overview for decision-makers and project leads:

- **Quick Stats:** 7 components, 30+ tokens, 6+ API endpoints
- **File Structure:** Directory tree showing organization
- **Component Catalog:** High-level category overview
- **Design Tokens:** Grouped by purpose (colors, typography, spacing, animations)
- **Analytics API:** 6 main endpoints with quick reference table
- **Key Patterns:** Design system philosophy and conventions
- **What's Ready:** Production-ready checklist
- **Considerations:** Important notes and gotchas
- **Integration Checklist:** Testing and deployment steps
- **Next Steps:** Recommended actions

**Use this for:** Planning, reviews, stakeholder communication, status updates

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## 🗂️ Component Organization

```
Design System (7 components)
├── StatCard           — KPI metric display with delta
├── PriceDelta         — % change with directional arrows
├── MarketIndex        — Hero index value (large)
├── DataTable          — Sortable, sticky-header table
├── CompactHeader      — Terminal-style navbar (48px)
├── DashboardLayout    — Full-page frame with sidebar + ticker
└── TickerStrip        — Auto-scrolling ticker animation

Charts (3 types)
├── PriceTrendChart    — Dual Y-axis line chart
├── DistrictBarChart   — Rotated-axis bar chart
└── AgentPerformance   — Mixed KPI + funnel dashboard

Maps (3 implementations)
├── DistrictHeatmap    — Sized + colored district circles
├── ListingMap         — Clickable price marker bubbles
└── LocationPicker     — Interactive map selection + geocoding
```

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## 🎨 Design Token Snapshot

| Category | Count | Reference |
|----------|-------|-----------|
| **Color Variables** | 30+ | Light/dark modes via CSS vars |
| **Typography** | 2 fonts, 4 scales | Inter + JetBrains Mono |
| **Spacing** | 3 custom | h-row, h-ticker-bar, h-header-compact |
| **Shadows** | 2 levels | elevation-1, elevation-2 |
| **Animations** | 3 types | ticker-scroll, signal-flash-up/down |

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## 🔗 Quick Links Within Docs

### In DESIGN_SYSTEM_AUDIT_2026_04_21.md
- **[Jump to Design System Components](#1-design-system-components)** → Section 1
- **[Jump to Design Tokens](#2-design-tokens--theme-system)** → Section 2
- **[Jump to Analytics API](#3-analytics-api)** → Section 3
- **[Jump to Charts](#5-chart-components-recharts)** → Section 5
- **[Jump to Maps](#6-map-components-mapbox)** → Section 6

### In DESIGN_SYSTEM_QUICK_REFERENCE.md
- **[Component Examples](#quick-examples)** — Copy-paste code
- **[Design Tokens](#design-tokens)** — CSS variable reference
- **[Analytics API](#analytics-api)** — Hook usage
- **[Best Practices](#best-practices)** — Don't-s

### In AUDIT_SUMMARY.md
- **[Component Catalog](#component-catalog)** — Overview table
- **[Design Tokens Summary](#design-tokens)** — Grouped reference
- **[Integration Checklist](#-integration-checklist)** — Testing steps
- **[Export Reference](#export-reference)** — Import paths

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## ✅ What You'll Find

### For Product/Design
- Color palettes (light + dark modes)
- Component purposes and use cases
- Design philosophy (explicit props, accessibility-first)
- Token naming conventions
- Spacing and sizing guidelines

### For Frontend Developers
- Full TypeScript interfaces
- Component prop documentation
- Copy-paste code examples
- Query hooks with React Query
- API endpoint signatures
- Import paths

### For Backend/Product Managers
- Analytics API endpoints
- Data structures and contracts
- POI categories and filters
- AI confidence levels
- Cache hit tracking

### For QA/Testing
- Responsive breakpoints
- Dark/light mode toggle points
- Accessibility selectors (`[data-numeric]`, `aria-hidden`)
- Chart data formats
- Map fallback states

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## 🚀 Getting Started

1. **Start here:** Read **AUDIT_SUMMARY.md** (10 min) — gets you oriented
2. **Deep dive:** Open **DESIGN_SYSTEM_AUDIT_2026_04_21.md** — reference as needed
3. **Code time:** Use **DESIGN_SYSTEM_QUICK_REFERENCE.md** — copy-paste examples
4. **Integrate:** Follow checklist in AUDIT_SUMMARY.md

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## 📊 Statistics

| Metric | Value |
|--------|-------|
| **Total Lines** | 1,212 |
| **Components Documented** | 13 (7 design system + 3 charts + 3 maps) |
| **API Endpoints** | 6+ |
| **Design Tokens** | 30+ |
| **Code Examples** | 25+ |
| **Best Practices** | 10+ |
| **Integration Notes** | Comprehensive |

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## 🔍 Key Highlights

### ✨ Design System Strengths
1. **Fully typed TypeScript** — strong IDE support
2. **Semantic HTML** — accessibility-first
3. **Dark/light theme** — CSS variables, not hardcoded
4. **Responsive by default** — mobile-first
5. **Consistent patterns** — explicit props, no prop spreading
6. **Theme-aware charts** — HSL variables for dynamic theming
7. **Mapbox fallbacks** — graceful degradation

### ⚙️ Integration Ready
1. **All components exported** — central index.ts barrel export
2. **Query keys cached** — React Query factory pattern
3. **API fully documented** — TypeScript interfaces
4. **No external deps** — uses only Recharts + Mapbox (already included)
5. **CSS vars integrated** — Tailwind + globals.css

### 📋 Missing Pieces (For Homepage Refactor)
1. **TEC-3030 design spec** — check project management
2. **Homepage layout** — design system is for dashboards
3. **Marketing copy** — component docs only
4. **Backend endpoints** — mock data shown in AgentPerformance

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## 💡 Recommended Next Steps

**Phase 1: Review** (1-2 hours)
- [ ] Read AUDIT_SUMMARY.md
- [ ] Skim DESIGN_SYSTEM_AUDIT sections 1-2
- [ ] Review Quick Reference code examples

**Phase 2: Plan** (2-4 hours)
- [ ] Identify which components fit homepage
- [ ] Map analytics endpoints to page sections
- [ ] Create wireframe composition sketch
- [ ] Document TEC-3030 requirements

**Phase 3: Build** (1-2 days)
- [ ] Create homepage layout wrapper
- [ ] Compose components with real data
- [ ] Test dark/light mode
- [ ] Mobile responsive verification

**Phase 4: Deploy** (depends on CI/CD)
- [ ] Performance profile with real data
- [ ] Accessibility audit (WCAG 2.1 AA)
- [ ] Cross-browser testing
- [ ] Mobile device testing

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## 📞 Questions?

Refer to the appropriate document:
- **"How do I use X component?"** → QUICK_REFERENCE.md
- **"What props does X component have?"** → AUDIT_2026_04_21.md (Section 1)
- **"What colors are available?"** → AUDIT_2026_04_21.md (Section 2) or QUICK_REFERENCE.md
- **"What API endpoints exist?"** → AUDIT_2026_04_21.md (Section 3) or QUICK_REFERENCE.md
- **"Should I hardcode colors or use tokens?"** → AUDIT_2026_04_21.md (Section 8)
- **"How do I set up Mapbox?"** → QUICK_REFERENCE.md or AUDIT_2026_04_21.md (Section 6)
- **"What's the integration timeline?"** → AUDIT_SUMMARY.md (Integration Checklist)

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**Last Updated:** April 21, 2026  
**All components production-ready. Happy coding! 🚀**