Colors

Usage

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-line">
  <button className="bg-kumo-brand text-white">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-colors rule will flag any raw Tailwind colors like bg-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 — Default theme (no attribute needed)
fedramp — Government compliance styling

// Apply a theme to a section or the whole app
<div data-theme="fedramp">
  {/* All Kumo 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 @cloudflare/kumo codegen:themes --list

# Generate theme CSS files
pnpm --filter @cloudflare/kumo codegen:themes

# Preview changes without writing files
pnpm --filter @cloudflare/kumo codegen:themes --dry-run

Theme 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

Tokens are grouped 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.

Token	Purpose
`bg-kumo-info`	Info indicator (icon, dot, bar)
`bg-kumo-success`	Success indicator
`bg-kumo-warning`	Warning indicator
`bg-kumo-danger`	Error/destructive indicator

Use the solid token on icons, status dots, and progress fills. Banners and badges use the solid fills with a reduced opacity.

// Banner with tinted background and solid icon
<div className="bg-kumo-danger-tint text-kumo-danger">
  <AlertIcon className="text-kumo-danger" />
  <p>Something went wrong.</p>
</div>

Text Colors

Token	Purpose
`text-kumo-default`	Primary body text
`text-kumo-strong`	Secondary text with slightly less contrast than default
`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

Borders & Rings

Token	Purpose
`kumo-hairline`New	A border/ring color to distinguish between flat surfaces where no shadow is present (i.e. `LayerCard`).
`kumo-line`	A thicker border/ring color that defines the edge of an elevated surface alongside a shadow.

The distinction between line and fill reflects intent: line is for layout separators, fill is for element outlines. Mixing them can make UI feel inconsistent.

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.

Displaying 61 tokens

Text Colors (12)

--text-color-kumo-default

Lightvar(--color-neutral-900, oklch(21% 0.006 285.885))

Darkvar(--color-neutral-100, oklch(97% 0 0))

--text-color-kumo-inverse

Lightvar(--color-neutral-100, oklch(97% 0 0))

Darkvar(--color-neutral-900, oklch(20.5% 0 0))

--text-color-kumo-strong

Lightvar(--color-neutral-600, oklch(43.9% 0 0))

Darkvar(--color-neutral-400, oklch(70.8% 0 0))

--text-color-kumo-subtle

Lightvar(--color-neutral-500, oklch(55.6% 0 0))

Darkvar(--color-kumo-neutral-50, oklch(97.5% 0 0))

--text-color-kumo-inactive

Lightvar(--color-neutral-400, oklch(70.8% 0 0))

Darkvar(--color-neutral-600, oklch(70.8% 0 0))

--text-color-kumo-placeholder

Lightvar(--color-neutral-400, oklch(70.8% 0 0))

Darkvar(--color-neutral-500, oklch(55.6% 0 0))

--text-color-kumo-brand

Light#f6821f

Dark#f6821f

--text-color-kumo-link

Lightvar(--color-blue-800, oklch(42.4% 0.199 265.638))

Darkvar(--color-blue-400, oklch(70.7% 0.165 254.624))

--text-color-kumo-info

Lightvar(--color-blue-700, oklch(48.8% 0.243 264.376))

Darkvar(--color-blue-400, oklch(70.7% 0.165 254.624))

--text-color-kumo-success

Lightvar(--color-green-500, oklch(72.3% 0.219 149.579))

Darkvar(--color-green-400, oklch(79.2% 0.209 151.711))

--text-color-kumo-danger

Lightvar(--color-red-700, oklch(50.5% 0.213 27.518))

Darkvar(--color-red-400, oklch(70.4% 0.191 22.216))

--text-color-kumo-warning

Lightvar(--color-yellow-800, oklch(47.6% 0.114 61.907))

Darkvar(--color-yellow-400, oklch(85.2% 0.199 91.936))

Surface, State & Theme Colors (27)

--color-kumo-canvas

Lightvar(--color-kumo-neutral-25, oklch(98.75% 0 0))

Darkvar(--color-kumo-neutral-1000, oklch(10% 0 0))

--color-kumo-elevated

Lightvar(--color-kumo-neutral-75, oklch(98% 0 0))

Darkvar(--color-kumo-neutral-975, oklch(12% 0 0))

--color-kumo-recessed

Lightvar(--color-kumo-neutral-125, oklch(96% 0 0))

Darkvar(--color-kumo-neutral-950, oklch(15% 0 0))

--color-kumo-base

Lightvar(--color-white, #fff)

Darkvar(--color-kumo-neutral-925, oklch(17% 0 0))

--color-kumo-tint

Lightvar(--color-neutral-100, oklch(97% 0 0))

Darkvar(--color-kumo-neutral-800, oklch(26.9% 0 0))

--color-kumo-contrast

Lightvar(--color-kumo-neutral-975, oklch(8.5% 0 0))

Darkvar(--color-kumo-neutral-25, oklch(98.5% 0 0))

--color-kumo-overlay

Lightvar(--color-kumo-neutral-50, oklch(97.5% 0 0))

Darkvar(--color-neutral-800, oklch(26.9% 0 0))

--color-kumo-control

Lightvar(--color-white, #fff)

Darkvar(--color-neutral-900, oklch(21% 0.006 285.885))

--color-kumo-interact

Lightvar(--color-neutral-300, oklch(87% 0 0))

Darkvar(--color-neutral-700, oklch(37.1% 0 0))

--color-kumo-fill

Lightvar(--color-neutral-200, oklch(92.2% 0 0))

Darkvar(--color-neutral-800, oklch(26.9% 0 0))

--color-kumo-fill-hover

Lightvar(--color-kumo-neutral-125, oklch(96.5% 0 0))

Darkvar(--color-neutral-800, oklch(37.1% 0 0))

--color-kumo-brand

Lightoklch(0.5772 0.2324 260)

Darkoklch(0.5772 0.2324 260)

--color-kumo-brand-hover

Lightvar(--color-blue-700, oklch(48.8% 0.243 264.376))

Darkvar(--color-blue-700, oklch(48.8% 0.243 264.376))

--color-kumo-line

Lightoklch(14.5% 0 0 / 0.1)

Darkvar(--color-neutral-800, oklch(26.9% 0 0))

--color-kumo-hairline

Lightvar(--color-kumo-neutral-150, oklch(93.5% 0 0))

Darkvar(--color-neutral-700, oklch(37.1% 0 0))

--color-kumo-shadow-edge

Lightoklch(0% 0 0 / 0.12)

Darkoklch(100% 0 0 / 0.1)

--color-kumo-shadow-drop

Lightoklch(0% 0 0 / 0.08)

Darkoklch(0% 0 0 / 0.3)

--color-kumo-tip-shadow

Lightvar(--color-gray-200, oklch(92.8% 0.006 264.531))

Darktransparent

--color-kumo-tip-stroke

Lighttransparent

Darkvar(--color-neutral-800, oklch(26.9% 0 0))

--color-kumo-info

Lightvar(--color-blue-500, oklch(62.3% 0.214 259.815))

Darkvar(--color-blue-400, oklch(70.7% 0.165 254.624))

--color-kumo-info-tint

Lightvar(--color-blue-300, oklch(80.9% 0.105 251.813))

Darkvar(--color-blue-900, oklch(37.9% 0.146 265.522))

--color-kumo-warning

Lightvar(--color-yellow-500, oklch(79.5% 0.184 86.047))

Darkvar(--color-yellow-700, oklch(55.4% 0.135 66.442))

--color-kumo-warning-tint

Lightvar(--color-yellow-300, oklch(90.5% 0.182 98.111))

Darkvar(--color-yellow-900, oklch(42.1% 0.095 57.708))

--color-kumo-danger

Lightvar(--color-red-500, oklch(63.7% 0.237 25.331))

Darkvar(--color-red-700, oklch(50.5% 0.213 27.518))

--color-kumo-danger-tint

Lightvar(--color-red-300, oklch(80.8% 0.114 19.571))

Darkvar(--color-red-900, oklch(39.6% 0.141 25.723))

--color-kumo-success

Lightvar(--color-green-500, oklch(72.3% 0.219 149.579))

Darkvar(--color-green-700, oklch(52.7% 0.154 150.069))

--color-kumo-success-tint

Lightvar(--color-green-300, oklch(87.1% 0.15 154.449))

Darkvar(--color-green-900, oklch(39.3% 0.095 152.535))

Component Colors (22)

Badge (22)

--text-color-kumo-badge-red-subtle

Lightvar(--color-red-800, oklch(44.4% 0.177 26.899))

Darkvar(--color-red-200, oklch(88.5% 0.062 18.334))

--text-color-kumo-badge-orange-subtle

Lightvar(--color-orange-800, oklch(47% 0.157 37.304))

Darkvar(--color-orange-200, oklch(90.1% 0.076 70.697))

--text-color-kumo-badge-yellow-subtle

Lightvar(--color-yellow-800, oklch(47.6% 0.114 61.907))

Darkvar(--color-yellow-200, oklch(94.5% 0.129 101.54))

--text-color-kumo-badge-green-subtle

Lightvar(--color-emerald-800, oklch(43.2% 0.095 166.913))

Darkvar(--color-emerald-200, oklch(90.5% 0.093 164.15))

--text-color-kumo-badge-teal-subtle

Lightvar(--color-teal-800, oklch(43.7% 0.078 188.216))

Darkvar(--color-teal-200, oklch(91% 0.096 180.426))

--text-color-kumo-badge-blue-subtle

Lightvar(--color-blue-800, oklch(42.4% 0.199 265.638))

Darkvar(--color-blue-200, oklch(88.2% 0.059 254.128))

--text-color-kumo-badge-neutral-subtle

Lightvar(--color-neutral-800, oklch(26.9% 0 0))

Darkvar(--color-neutral-200, oklch(92.2% 0 0))

--text-color-kumo-badge-inverted

Lightvar(--color-white, #fff)

Darkvar(--color-black, #000)

--color-kumo-badge-red

Lightvar(--color-red-600, oklch(57.7% 0.245 27.325))

Darkvar(--color-red-700, oklch(50.5% 0.213 27.518))

--color-kumo-badge-red-subtle

Lightvar(--color-red-100, oklch(93.6% 0.032 17.717))

Darkvar(--color-red-900, oklch(39.6% 0.141 25.723))

--color-kumo-badge-orange

Lightvar(--color-orange-600, oklch(64.6% 0.222 41.116))

Darkvar(--color-orange-700, oklch(55.3% 0.195 38.402))

--color-kumo-badge-orange-subtle

Lightvar(--color-orange-100, oklch(95.4% 0.038 75.164))

Darkvar(--color-orange-900, oklch(40.8% 0.123 38.172))

--color-kumo-badge-yellow

Lightvar(--color-yellow-600, oklch(68.1% 0.162 75.834))

Darkvar(--color-yellow-700, oklch(55.4% 0.135 66.442))

--color-kumo-badge-yellow-subtle

Lightvar(--color-yellow-100, oklch(97.3% 0.071 103.193))

Darkvar(--color-yellow-900, oklch(42.1% 0.095 57.708))

--color-kumo-badge-green

Lightvar(--color-emerald-600, oklch(59.6% 0.145 163.225))

Darkvar(--color-emerald-700, oklch(50.8% 0.118 165.612))

--color-kumo-badge-green-subtle

Lightvar(--color-emerald-100, oklch(95% 0.052 163.051))

Darkvar(--color-emerald-900, oklch(37.8% 0.077 168.94))

--color-kumo-badge-teal

Lightvar(--color-teal-600, oklch(60% 0.118 184.704))

Darkvar(--color-teal-700, oklch(51.1% 0.096 186.391))

--color-kumo-badge-teal-subtle

Lightvar(--color-teal-100, oklch(95.3% 0.051 180.801))

Darkvar(--color-teal-900, oklch(38.6% 0.063 188.416))

--color-kumo-badge-blue

Lightvar(--color-blue-600, oklch(54.6% 0.245 262.881))

Darkvar(--color-blue-700, oklch(48.8% 0.243 264.376))

--color-kumo-badge-blue-subtle

Lightvar(--color-blue-100, oklch(93.2% 0.032 255.585))

Darkvar(--color-blue-900, oklch(37.9% 0.146 265.522))

--color-kumo-badge-neutral

Lightvar(--color-neutral-600, oklch(43.9% 0 0))

Darkvar(--color-neutral-600, oklch(43.9% 0 0))

--color-kumo-badge-inverted

Lightvar(--color-neutral-950, oklch(14.5% 0 0))

Darkvar(--color-white, #fff)