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Overview

OpenChamber uses a JSON-based theme system. Themes are defined in packages/ui/src/lib/theme/themes/. Users can also add custom themes via ~/.config/openchamber/themes/.

Core principle: UI colors must use theme tokens - never hardcoded hex colors or Tailwind color classes.

When to Use

• Creating or modifying UI components
• Working with colors, backgrounds, borders, or text

Quick Decision Tree

1. Code display? → syntax.*
2. Feedback/status? → status.*
3. Primary CTA? → primary.*
4. Interactive/clickable? → interactive.*
5. Background layer? → surface.*
6. Text? → surface.foreground or surface.mutedForeground

Critical Rules

• surface.elevated = inputs, cards, panels
• interactive.hover = ONLY on clickable elements
• interactive.selection = active/selected states (not primary!)
• Status colors = ONLY for actual feedback (errors, warnings, success)
• Input footers = bg-transparent on elevated background

Never Use

• Hardcoded hex colors (#FF0000)
• Tailwind colors (bg-white, text-blue-500, bg-gray-*)
• Deprecated: bg-secondary, bg-muted

Usage

Via Hook

import { useThemeSystem } from '@/contexts/useThemeSystem';
const { currentTheme } = useThemeSystem();

<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>

Via CSS Variables

<div className="bg-[var(--surface-elevated)] hover:bg-[var(--interactive-hover)]">

Color Tokens

Surface Colors

Interactive Colors

Status Colors

Each has variants: *, *Foreground, *Background, *Border.

Primary Colors

Primary vs Selection: Primary = "click me" (CTA), Selection = "currently active" (state).

Syntax Colors

For code display only. Never use for UI elements.

Examples

Input Area

const { currentTheme } = useThemeSystem();

<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>
  <textarea className="bg-transparent" />
  <div className="bg-transparent">{/* Footer - transparent! */}</div>
</div>

Active Tab

<button className={isActive 
  ? 'bg-interactive-selection text-interactive-selection-foreground'
  : 'hover:bg-interactive-hover/50'
}>

Error Message

<div style={{ 
  color: currentTheme.colors.status.error,
  backgroundColor: currentTheme.colors.status.errorBackground 
}}>

Card

<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>
  <h3 style={{ color: currentTheme.colors.surface.foreground }}>Title</h3>
  <p style={{ color: currentTheme.colors.surface.mutedForeground }}>Description</p>
</div>

Wrong vs Right

Wrong

// Hardcoded colors
<div style={{ backgroundColor: '#F2F0E5' }}>
<button className="bg-blue-500">

// Primary for active tab
<Tab className="bg-primary">Active</Tab>

// Hover on static element
<div className="hover:bg-interactive-hover">Static card</div>

// Colored footer on input
<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>
  <textarea />
  <div style={{ backgroundColor: currentTheme.colors.surface.muted }}>Footer</div>
</div>

Right

// Theme tokens
<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>
<button style={{ backgroundColor: currentTheme.colors.primary.base }}>

// Selection for active tab
<Tab style={{ backgroundColor: currentTheme.colors.interactive.selection }}>Active</Tab>

// Hover only on clickable
<button className="hover:bg-[var(--interactive-hover)]">Click</button>

// Transparent footer
<div style={{ backgroundColor: currentTheme.colors.surface.elevated }}>
  <textarea className="bg-transparent" />
  <div className="bg-transparent">Footer</div>
</div>

References

• Adding Themes - Built-in and custom themes

Key Files

• Theme types: packages/ui/src/types/theme.ts
• Theme hook: packages/ui/src/contexts/useThemeSystem.ts
• CSS generator: packages/ui/src/lib/theme/cssGenerator.ts
• Built-in themes: packages/ui/src/lib/theme/themes/