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2026-07-13 12:58:18 +08:00

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# Showcase Integration Package — Styling Guide
Tagline: Tailwind v4 purging traps, CopilotKit class overrides, chat layout
wrapper pattern, theme tokens, and Docker-image CSS verification recipe.
Externally referenced from per-demo READMEs — preserve path at
`showcase/STYLING-GUIDE.md`.
When building demo pages for integration packages, follow these rules to avoid common pitfalls.
## Tailwind v4 Purging
**Tailwind v4 aggressively purges CSS classes it can't statically analyze.** If your component renders Tailwind classes dynamically (e.g., from state, props, or conditional logic), those classes will be missing from the CSS bundle.
### Do: Use inline styles for dynamic components
```tsx
// GOOD — inline styles always work
<div style={{ padding: "32px", borderRadius: "16px", border: "1px solid #e5e5e0" }}>
```
### Don't: Use Tailwind classes on dynamically rendered content
```tsx
// BAD — Tailwind may purge these classes
<div className="p-8 rounded-2xl border border-gray-200">
```
### When it's safe to use Tailwind
Tailwind classes work fine on:
- Static JSX in your component (not inside maps, conditionals, or dynamic renders)
- The CopilotKit wrapper divs you write yourself
- Next.js page-level layout elements
Tailwind classes are UNSAFE on:
- Content rendered by `useRenderTool`, `useHumanInTheLoop`, `useFrontendTool` handlers
- Components rendered inside CopilotKit's chat message area
- Any JSX returned from a callback or dynamic render function
## CopilotKit Component Overrides
CopilotKit v2 components use `cpk:` prefixed Tailwind classes internally. To override them:
### Do: Use a separate CSS file
```css
/* copilotkit-overrides.css — import in layout.tsx AFTER globals.css */
.copilotKitInput {
border-radius: 0.75rem;
border: 1px solid var(--copilot-kit-separator-color) !important;
}
```
> Do NOT hardcode `.copilotKitChat { background-color: #fff !important; }` in
> these overrides. It overrides demo-level theming (e.g. beautiful-chat's dark
> mode toggle) and forces white in every theme. Let the v2 styles + per-demo
> `ThemeProvider` handle chat backgrounds.
```tsx
// layout.tsx
import "./globals.css";
import "./copilotkit-overrides.css"; // AFTER globals
```
### Don't: Put overrides in globals.css
Tailwind v4 processes `globals.css` and purges anything it doesn't recognize as a utility class. CopilotKit class selectors (`.copilotKitChat`, `.copilotKitInput`) will be stripped.
## Chat Layout — The Wrapper Pattern
To get proper spacing around the CopilotChat component, wrap it like the Dojo does:
```tsx
// GOOD — matches Dojo spacing
<div className="flex justify-center items-center h-screen w-full">
<div className="h-full w-full md:w-4/5 md:h-4/5 rounded-lg">
<CopilotChat className="h-full rounded-2xl max-w-6xl mx-auto" />
</div>
</div>
```
The `md:w-4/5` gives 80% width on desktop, creating natural side margins. Don't try to add margins via CSS overrides on CopilotKit's internal classes — use the wrapper div.
## Theme
All integration packages should use the light theme to match the showcase shell:
```css
:root {
--copilot-kit-background-color: #fafaf9;
--copilot-kit-primary-color: #0d6e3f;
--copilot-kit-response-button-background-color: #f5f5f3;
--copilot-kit-response-button-color: #1a1a18;
}
html,
body {
background: #fafaf9;
color: #1a1a18;
}
```
## Images
Don't reference local image files from agent-generated content. The agent may generate `image_name` values that don't exist on disk. Always add an `onError` fallback:
```tsx
{
imageUrl && !imageError && (
<img src={imageUrl} onError={() => setImageError(true)} alt="..." />
);
}
```
## SVG Icons
Don't use SVG icons with `fill="currentColor"` inside CopilotKit chat messages. The `currentColor` inheritance is unpredictable in the chat context. Use emoji instead:
```tsx
// GOOD
<span style={{ fontSize: "48px" }}>☀️</span>
// BAD — renders as giant black shapes
<svg fill="currentColor" className="w-14 h-14 text-yellow-200">...</svg>
```
## Testing Locally
Always build and test the Docker image locally before pushing:
```bash
cd /proj/cpk/CopilotKit
docker build -f showcase/integrations/<slug>/Dockerfile -t <slug>-local showcase/integrations/<slug>/
docker run -d --name <slug>-local -p 4444:10000 -e PORT=10000 <slug>-local
# Verify CSS overrides survived the build
curl -sf http://localhost:4444/_next/static/css/*.css | grep "copilotKitChat"
# Verify inline styles are in rendered HTML
curl -sf http://localhost:4444/demos/<demo> | grep "padding: 32px"
# Clean up
docker rm -f <slug>-local
```