# Basecoat Multi-Style + Theme Refactor Plan

## Goals

- Support the current shadcn/ui visual packs: `vega`, `nova`, `maia`, `lyra`, `mira`, `luma`, `sera`, `rhea`.
- Keep current CDN and Tailwind/NPM usage working.
- Keep Basecoat's own class API (`btn`, `dialog`, `popover`, etc.).
- Split CSS into base tokens/utilities, component structure, style-pack visuals, and aggregate outputs.
- Make custom token themes, including TweakCN-style themes, predictable by loading them after Basecoat CSS.

## Current Upstream Reference

- Local repo: `../_sandbox/shadcn-ui`
- Style registry: `../_sandbox/shadcn-ui/apps/v4/registry/styles.tsx`
- Style files: `../_sandbox/shadcn-ui/apps/v4/registry/styles/style-{vega,nova,maia,lyra,mira,luma,sera,rhea}.css`
- Base components: `../_sandbox/shadcn-ui/apps/v4/registry/bases/base/ui/<component>.tsx`

## Target CSS Architecture

1. `src/css/base/base.css`
   - base layer, default token fallbacks, and semantic utilities needed by CDN users
2. `src/css/components/*.css`
   - Basecoat component selectors and shared structural behavior
3. `src/css/styles/style-*.css`
   - one file per style pack: `vega`, `nova`, `maia`, `lyra`, `mira`, `luma`, `sera`, `rhea`
   - component visuals: size, spacing, radius, typography, shadows, focus rings, variant colors when style-owned
4. Aggregates
   - `src/css/basecoat.css`: backward-compatible default aggregate, includes Vega
   - `src/css/basecoat.all.css`: explicit all-in-one Tailwind source
   - `src/css/basecoat.cdn.css`: CDN build entry

No `.style-*` wrapper is part of the Basecoat public contract for style selection. Users choose a style by importing a style file or using a style-specific generated asset. Docs may switch by swapping stylesheet URLs.

## Per-Component File Checklist

For every component, check these files before editing:

- Basecoat component CSS: `src/css/components/<component>.css`
- Basecoat templates/macros if relevant: `src/nunjucks/*.njk`, `src/jinja/*.html.jinja`
- Basecoat docs examples: `docs/src/components/<component>.njk`
- Upstream base component: `../_sandbox/shadcn-ui/apps/v4/registry/bases/base/ui/<component>.tsx`
- Upstream style packs: `../_sandbox/shadcn-ui/apps/v4/registry/styles/style-{vega,nova,maia,lyra,mira,luma,sera,rhea}.css`
- Basecoat style packs: `src/css/styles/style-{vega,nova,maia,lyra,mira,luma,sera,rhea}.css`

## Component Migration Workflow

1. Review current Basecoat CSS, markup, templates, and docs for the component.
2. Review the upstream base component and all eight upstream style files.
3. Decide what is shared structure versus style-pack-owned visual rules.
4. Remove outdated visual rules from shared component CSS when they are now style-owned.
5. Map upstream style intent onto Basecoat selectors. Do not port `cn-*` selectors.
6. Update the component section in all eight Basecoat style files.
7. Document non-trivial deltas as `intentional`, `drift fixed`, or `deferred`.
8. Update `migration-tracker.md`.
9. Run `npm run build`.
10. Run `npm run docs:build` when docs or docs style assets change.
11. Manually verify the docs page in light/dark and all eight styles.

Do not mark a component done because CSS compiles. It needs a visual/state check.

## Packaging Contract

- Keep `@import "basecoat-css";` as the default Vega-compatible import.
- Keep existing CDN files and JS bundle paths.
- Export split style files from `packages/css` as `basecoat-css/styles/<style>`.
- Keep the default CDN output equivalent to Vega unless a separate style-specific CDN asset is explicitly added.
- Custom themes should load after Basecoat styles so their `:root` and `.dark` tokens override defaults.

## Component Migration Order

1. `button`
2. `button-group`
3. `input`
4. `textarea`
5. `native-select`
6. `select`
7. `checkbox`
8. `radio`
9. `switch`
10. `range`
11. `label`
12. `field`
13. `card`
14. `alert`
15. `badge`
16. `table`
17. `tabs`
18. `popover`
19. `dropdown-menu`
20. `dialog`
21. `command`
22. `sidebar`
23. `toast`
24. `tooltip`
25. `collapsible`
26. `kbd`

## Current Status

- CSS split exists.
- Docs style switcher exists.
- Button is started and style sections exist for all eight styles.
- Button still needs a strict browser audit across all eight styles and light/dark.
- No other component should be considered migrated.

## Risks

- Selector drift between Basecoat markup and upstream shadcn/ui assumptions.
- Incorrectly leaving visual rules in shared component CSS.
- Bundle growth from style-specific assets.
- Docs style assets need base semantic utilities available during Tailwind compilation.