Problem

Before this package, each project maintained small, divergent CSS stacks. That created three recurring problems:

• UI inconsistencies in spacing, color usage, and component states between projects.
• Slower iteration because visual fixes had to be reimplemented in multiple repos.
• Harder maintenance when accessibility or theming improvements needed coordinated updates.

The design-system package addressed this by centralizing the primitives and publishing them as a reusable dependency.

Technical Architecture

The architecture is split into three layers: token foundation, component styling, and distribution/validation workflows.

flowchart TD
   A[Design Tokens<br/>styles/tokens.css] --> B[Base Layer<br/>styles/base.css]
   B --> C[Component Layer<br/>styles/components/*.css]
   C --> D[Package Entry Points<br/>index.css + exports map]
   D --> E[Consumer Repositories<br/>blog / cv / docs]

Tokens are the single source of visual truth. Base styles provide predictable defaults, and component styles compose on top without requiring framework-specific runtime code.

Build and distribution model

flowchart LR
   A[Source CSS in ui-theme repo] --> B[Versioned npm package]
   B --> C[Install in consumer repo]
   C --> D[Import full theme or modules]
   D --> E[Rendered UI]
   A --> F[Showcase docs pages]
   F --> G[Screenshot capture and visual review]

This keeps publishing lightweight while still supporting visual QA through the showcase.

Documentation architecture

flowchart TD
   A[showcase/index.html] --> B[Category pages]
   B --> C[Component examples]
   C --> D[Code snippets and usage notes]
   C --> E[Screenshot gallery]
   E --> F[Project pages in blog]

The docs are intentionally static so they can run locally without build complexity and publish cleanly to GitHub Pages.

Key Decisions

• CSS-first implementation over JS-heavy component runtime: Keeps footprint low and compatibility broad across static and framework-driven apps.
• Token-driven theming with data-theme switching: Enables consistent dark mode behavior without duplicating component definitions.
• Multi-page documentation instead of a single long showcase: Improves discoverability, QA focus, and screenshot maintenance.
• Local linking workflow for dependent repos: Enables fast integration testing before publishing package updates.

Challenges

The main challenge was balancing consistency with flexibility. Consumer projects needed a stable visual baseline, but still required room for project-specific layout behavior.

Other recurring challenges included:

• Preventing style leakage between component classes.
• Keeping docs examples realistic enough to validate true usage patterns.
• Synchronizing screenshot updates across the docs repo and project pages.

Outcomes

The package now serves as a shared UI foundation for Wintermuted projects and has reduced visual divergence across repos.

Observed impact so far:

• Faster UI iteration due to reusable component patterns.
• Cleaner onboarding for new pages using docs-backed examples.
• Improved consistency in dark/light theming behavior.
• Better architecture communication via diagram-backed documentation.