Colors
Senna uses semantic color tokens that automatically adapt to light and dark mode. Use these classes instead of raw color values.
Usage
The kumo-* prefix is inherited from upstream Kumo and remains Senna’s compatibility namespace. Use it for current semantic classes; do not substitute raw Tailwind colors or invent a parallel prefix.
Always use semantic tokens instead of raw Tailwind colors. This ensures your UI automatically adapts to light and dark mode, and that your components remain consistent across themes.
Correct
<div className="bg-kumo-base text-kumo-default border-kumo-hairline">
<button className="bg-kumo-brand text-kumo-on-brand">Primary</button>
<button className="bg-kumo-control text-kumo-default">Secondary</button>
</div>Incorrect
{
/* Never use raw Tailwind colors */
}
<div className="bg-white dark:bg-gray-900 text-black dark:text-white">
<button className="bg-blue-500">Primary</button>
</div>;Lint rules enforce this: The
no-primitive-colorsrule will flag any raw Tailwind colors likebg-blue-500.
Mode
Set data-mode on a parent element to control light/dark mode. Never use Tailwind’s dark: variant — semantic tokens handle dark mode automatically via CSS light-dark().
// Set mode on html or body
<html data-mode="light"> // Light mode
<html data-mode="dark"> // Dark mode
// Components automatically adapt - no dark: variants needed
<div className="bg-kumo-base text-kumo-default" />Themes
Themes override semantic token values while preserving the same token names. Set data-theme on a parent element to apply a theme.
Available Themes
kumo— Senna’s Bridge Blue default (no attribute needed; name retained for compatibility)river-teal,clear-sky,bridge-blue,deep-indigo— selectable color-lab directions sourced from Senna’s palette explorationfedramp— Government compliance styling
// Apply a theme to a section or the whole app
<div data-theme="fedramp">
{/* All Senna components inside use fedramp token overrides */}
<Button>FedRAMP Styled</Button>
</div>
// Themes work with both light and dark mode
<html data-mode="dark" data-theme="fedramp">Theme Generator
Themes are defined in a centralized config and generated as CSS files. The theme generator ensures consistency across all themes.
# List all tokens and their theme overrides
pnpm --filter @bridgee-ai/senna codegen:themes --list
# Generate theme CSS files
pnpm --filter @bridgee-ai/senna codegen:themes
# Preview changes without writing files
pnpm --filter @bridgee-ai/senna codegen:themes --dry-runTheme config: packages/kumo/scripts/theme-generator/config.ts
Creating a New Theme
Add theme overrides in the config file. Only override tokens that need to change — all other tokens inherit from the base kumo theme.
// In scripts/theme-generator/config.ts
export const THEME_CONFIG: ThemeConfig = {
color: {
"kumo-base": {
newName: "",
theme: {
kumo: {
light: "var(--color-white, #fff)",
dark: "var(--color-black, #000)",
},
// Add your theme override
myTheme: {
light: "#f0f4f8",
dark: "#1a1f2e",
},
},
},
// ... other tokens
},
};
// Add to available themes
export const AVAILABLE_THEMES = ["kumo", "fedramp", "myTheme"] as const;Then run pnpm codegen:themes to generate the CSS.
Semantic Tokens
We use semantic tokens to group colors by purpose. Use the token that matches the role of the element, not the color you want to achieve.
Semantic tokens are named by role, not by hue. A token like bg-kumo-danger communicates intent — it doesn’t imply a specific shade of red, and its exact value can change per theme or color mode without touching your component code.
Surface Hierarchy
Surfaces establish depth and layering in the UI. Use them in order from the outermost background inward.
| Token | Purpose |
|---|---|
bg-kumo-canvas | The outermost page background — sits behind everything |
bg-kumo-base | Default component background |
bg-kumo-elevated | Slightly elevated surface, e.g. LayerCard.Secondary |
bg-kumo-recessed | Recessed surface with a subtly darker fill, e.g. segmented Tabs background |
bg-kumo-tint | Subtle tinted background for tables or hover states |
bg-kumo-contrast | High-contrast, inverted background |
Brand
| Token | Purpose |
|---|---|
bg-kumo-brand | Primary brand background |
bg-kumo-brand-hover | Hover state for brand backgrounds |
Semantic Status Colors
Each status color comes in two variants: a solid color for icons and indicators, and a -tint variant for background fills behind content (i.e. Badge or Banner).
| Token | Purpose |
|---|---|
bg-kumo-info | Info indicator |
bg-kumo-success | Success indicator |
bg-kumo-warning | Warning indicator |
bg-kumo-danger | Error/destructive indicator |
Use the solid token bg-kumo-* for status dots, fill-kumo-* for icons, and border-kumo-*, ring-kumo-* for borders and rings. Banners and badges use the -tint variant with varying opacity values.
import { WarningIcon } from "@phosphor-icons/react";
export function StatusBannerDemo() {
return (
<div className="flex items-center gap-2 rounded-lg bg-kumo-danger-tint/70 p-4">
<WarningIcon weight="fill" className="fill-kumo-danger" />
<span className="text-sm text-kumo-danger">Something went wrong.</span>
</div>
);
}Text Colors
| Token | Purpose |
|---|---|
text-kumo-default | Primary body text |
text-kumo-strong | Stronger text contrast than default for headers and important labels |
text-kumo-subtle | Muted text for descriptions, captions, or secondary labels |
text-kumo-inactive | Disabled or inactive text |
text-kumo-placeholder | Placeholder text in inputs |
text-kumo-inverse | Text intended for use on high-contrast or inverted backgrounds |
text-kumo-link | Link text |
text-kumo-info | Info-colored text |
text-kumo-success | Success-colored text |
text-kumo-warning | Warning-colored text |
text-kumo-danger | Error/destructive text |
Semantic text colors (i.e.
text-kumo-success) are darker by default to provide better contrast and readability againsttint-*backgrounds.
Borders & Rings
| Token | Purpose |
|---|---|
kumo-hairlineNew | A border/ring color to distinguish between flat surfaces where no shadow is present (i.e. LayerCard). |
kumo-hairline | A thicker border/ring color that defines the edge of an elevated surface alongside a shadow. |
Token Reference
Toggle the theme in the header to see how tokens adapt. Tokens marked as “global” are explicit opt-in classes available regardless of theme.
Senna color system
CanonicalCobalt actions, crisp white and black canvases, and quiet slate surfaces. Senna’s default for Bridgee. The accent carries primary actions and focus. Neutral surfaces carry structure; status colors keep their own semantic roles.