EPIC-12: Design System Bootstrap #115
Description
Epic: Design System Bootstrap
Epic ID: EPIC-12
Priority: Must Have
Sprint: Sprint 2
Description: Establishes the design system foundation so the ux-designer can participate in all future story cycles. The codebase currently has ~414 hardcoded hex colors and ~62 rgba() values scattered across ~25 CSS Module files with zero CSS custom properties, no design tokens, no logo/favicon, and no dark mode. This epic introduces a token-based design system, brand identity, full token migration, dark mode theming, and a documented style guide.
Requirements Coverage
- Section 3.1 (Technology Requirements): Responsive design, modern browser support — tokens enable consistent theming
- Section 3.2 (Performance): CSS custom properties are performant and cacheable
- Section 3.4 (Security): No direct security impact; enables accessible color contrast compliance
- Cross-cutting: Supports UX Polish (EPIC-10) by providing the token foundation it depends on
Dependencies
- Depends on EPIC-02 (App Shell & Infrastructure) — completed
- Depends on EPIC-03 (Work Items CRUD) — in progress; stories can run in parallel since design system is additive
- Blocks EPIC-10 (UX Polish & Accessibility) — dark mode and tokens are prerequisites
Goals
- Eliminate all hardcoded color values from CSS Modules
- Establish a single source of truth for visual design tokens
- Add brand identity (logo, favicon)
- Enable dark mode with user preference persistence
- Document the design system for future development consistency
Stories
- 12.1: Design Token System #116 — 12.1: Design Token System
- 12.2: Brand Identity — Logo & Favicon #117 — 12.2: Brand Identity — Logo & Favicon
- 12.3: Migrate CSS Modules to Design Tokens #118 — 12.3: Migrate CSS Modules to Design Tokens
- 12.4: Dark Mode with User Toggle #119 — 12.4: Dark Mode with User Toggle
- 12.5: Style Guide Documentation #120 — 12.5: Style Guide Documentation