Data displayGlass surface

ThemeBuilder

Builds scoped token previews with hue, scheme, manual color, and export controls.

View preview API reference View in Figma

FrameworksAstro · React · Elements

Registry commandlumen add ThemeBuilder

InteractionEnhanced runtime

Design sourceLinked component node

See it and copy it

Framework example

Choose Astro, React, or Elements to compare native usage against the shared visual output. Each example assumes the framework-level setup is already complete.

Brand theme

Brand hueAccent hue

View ThemeBuilder code

Framework usage

Switch targets to compare the adapter code. This live preview runs the Astro example. React and Elements use their own behavior APIs; complete the matching framework setup before copying an example.

---
import { Button, Label, Slider, Textarea, ThemeBuilder } from '@santi020k/lumen-astro'
---

<ThemeBuilder data-ui-theme-target="#ex-theme-preview">
  <header><h3>Brand theme</h3></header>
  <div style="display: grid; gap: 0.45rem;">
    <Label for="ex-theme-hue">Brand hue</Label>
    <Slider
      id="ex-theme-hue"
      data-ui-theme-brand-hue
      min="0"
      max="359"
      value="264"
    />
    <Label for="ex-theme-accent">Accent hue</Label>
    <Slider
      id="ex-theme-accent"
      data-ui-theme-accent-hue
      min="0"
      max="359"
      value="54"
    />
  </div>
  <div id="ex-theme-preview" style="display: flex; gap: 0.5rem; padding: 0.5rem;">
    <span data-ui-swatch style="--ui-swatch:hsl(var(--brand))"></span>
    <span data-ui-swatch style="--ui-swatch:hsl(var(--accent))"></span>
  </div>
  <div style="display: flex; gap: 0.5rem; flex-wrap: wrap;">
    <Button data-ui-theme-export>Export CSS</Button>
    <Button variant="outline" data-ui-theme-import>Import CSS</Button>
    <Button variant="secondary" data-ui-theme-check-contrast>Fix Contrast</Button>
  </div>
  <Textarea data-ui-theme-output aria-label="Theme CSS" />
</ThemeBuilder>

'use client'

import { ThemeBuilder, Card, Button, Label, Slider, Textarea } from '@santi020k/lumen-react'
import { useThemeBuilder } from '@santi020k/lumen-react'

export function CustomThemeBuilder() {
  const builder = useThemeBuilder({ defaultHue: 264, defaultScheme: 'dark' })

  return (
    <ThemeBuilder {...builder.rootProps}>
      <div style={builder.previewStyle}>
        <Card glass>
          <Label htmlFor="theme-brand-hue">Brand hue</Label>
          <Slider {...builder.hueProps} id="theme-brand-hue" min={0} max={359} />
          <Label htmlFor="theme-accent-hue">Accent hue</Label>
          <Slider {...builder.accentHueProps} id="theme-accent-hue" min={0} max={359} />
          <div>
            <Button {...builder.getSchemeProps('light')}>Light</Button>
            <Button {...builder.getSchemeProps('dark')}>Dark</Button>
          </div>
          <Label htmlFor="theme-output">Generated theme CSS</Label>
          <Textarea {...builder.outputProps} aria-label="Generated theme CSS" id="theme-output" readOnly rows={6} />
          <Button {...builder.exportButtonProps}>Copy CSS</Button>
        </Card>
      </div>
    </ThemeBuilder>
  )
}

<script type="module">
  import { defineLumenElements } from '@santi020k/lumen-elements/define'

  defineLumenElements()
</script>

<lumen-theme-builder data-ui-theme-target="#ex-theme-preview">
  <header><h3>Brand theme</h3></header>
  <div style="display: grid; gap: 0.45rem;">
    <lumen-label for="ex-theme-hue">Brand hue</lumen-label>
    <lumen-slider
      id="ex-theme-hue"
      data-ui-theme-brand-hue
      min="0"
      max="359"
      value="264"></lumen-slider>
    <lumen-label for="ex-theme-accent">Accent hue</lumen-label>
    <lumen-slider
      id="ex-theme-accent"
      data-ui-theme-accent-hue
      min="0"
      max="359"
      value="54"></lumen-slider>
  </div>
  <div id="ex-theme-preview" style="display: flex; gap: 0.5rem; padding: 0.5rem;">
    <span data-ui-swatch style="--ui-swatch:hsl(var(--brand))"></span>
    <span data-ui-swatch style="--ui-swatch:hsl(var(--accent))"></span>
  </div>
  <div style="display: flex; gap: 0.5rem; flex-wrap: wrap;">
    <lumen-button data-ui-theme-export>Export CSS</lumen-button>
    <lumen-button variant="outline" data-ui-theme-import>Import CSS</lumen-button>
    <lumen-button variant="secondary" data-ui-theme-check-contrast>Fix Contrast</lumen-button>
  </div>
  <lumen-textarea data-ui-theme-output aria-label="Theme CSS"></lumen-textarea>
</lumen-theme-builder>

Edit ThemeBuilder in browser

Framework differences

React: Connect useThemeBuilder to the root, hue controls, output, and export button. Preview tokens are scoped through previewStyle; the hook reference supplies the same example.

Choose your target

Add this component

Choose the package for your runtime. All adapters share the Lumen stylesheet. Use the matching registry command when you want a local wrapper for that framework.

pnpm add @santi020k/lumen-astro

pnpm add @santi020k/lumen-astro

lumen add ThemeBuilder

lumen add ThemeBuilder

pnpm add @santi020k/lumen-react

pnpm add @santi020k/lumen-react

lumen add ThemeBuilder --target react

lumen add ThemeBuilder --target react

pnpm add @santi020k/lumen-elements

pnpm add @santi020k/lumen-elements

lumen add ThemeBuilder --target elements

lumen add ThemeBuilder --target elements

Glass

Add the glass prop to apply the shared blur, saturation, border, and highlight tokens. Glass reads best over vivid content, so place the surface above imagery or color.

Brand theme

Brand hueAccent hue

View ThemeBuilder code

Framework usage

Switch targets to compare the adapter code. This live preview runs the Astro example. React and Elements use their own behavior APIs; complete the matching framework setup before copying an example.

---
import { Button, Label, Slider, Textarea, ThemeBuilder } from '@santi020k/lumen-astro'
---

<div class="docs-glass-demo">
  <ThemeBuilder data-ui-theme-target="#ex-glass-theme-preview" glass>
    <header><h2>Brand theme</h2></header>
    <div style="display: grid; gap: 0.45rem;">
      <Label for="ex-glass-theme-hue">Brand hue</Label>
      <Slider
        id="ex-glass-theme-hue"
        data-ui-theme-brand-hue
        min="0"
        max="359"
        value="264"
      />
      <Label for="ex-glass-theme-accent">Accent hue</Label>
      <Slider
        id="ex-glass-theme-accent"
        data-ui-theme-accent-hue
        min="0"
        max="359"
        value="54"
      />
    </div>
    <div id="ex-glass-theme-preview" style="display: flex; gap: 0.5rem; padding: 0.5rem;">
      <span data-ui-swatch style="--ui-swatch:hsl(var(--brand))"></span>
      <span data-ui-swatch style="--ui-swatch:hsl(var(--accent))"></span>
    </div>
    <div style="display: flex; gap: 0.5rem; flex-wrap: wrap;">
      <Button data-ui-theme-export>Export CSS</Button>
      <Button variant="outline" data-ui-theme-import>Import CSS</Button>
      <Button variant="secondary" data-ui-theme-check-contrast>Fix Contrast</Button>
    </div>
    <Textarea data-ui-theme-output aria-label="Theme CSS" />
  </ThemeBuilder>
</div>

'use client'

import { ThemeBuilder, Card, Button, Label, Slider, Textarea } from '@santi020k/lumen-react'
import { useThemeBuilder } from '@santi020k/lumen-react'

export function CustomThemeBuilder() {
  const builder = useThemeBuilder({ defaultHue: 264, defaultScheme: 'dark' })

  return (
    <ThemeBuilder {...builder.rootProps}>
      <div style={builder.previewStyle}>
        <Card glass>
          <Label htmlFor="theme-brand-hue">Brand hue</Label>
          <Slider {...builder.hueProps} id="theme-brand-hue" min={0} max={359} />
          <Label htmlFor="theme-accent-hue">Accent hue</Label>
          <Slider {...builder.accentHueProps} id="theme-accent-hue" min={0} max={359} />
          <div>
            <Button {...builder.getSchemeProps('light')}>Light</Button>
            <Button {...builder.getSchemeProps('dark')}>Dark</Button>
          </div>
          <Label htmlFor="theme-output">Generated theme CSS</Label>
          <Textarea {...builder.outputProps} aria-label="Generated theme CSS" id="theme-output" readOnly rows={6} />
          <Button {...builder.exportButtonProps}>Copy CSS</Button>
        </Card>
      </div>
    </ThemeBuilder>
  )
}

<script type="module">
  import { defineLumenElements } from '@santi020k/lumen-elements/define'

  defineLumenElements()
</script>

<div class="docs-glass-demo">
  <lumen-theme-builder data-ui-theme-target="#ex-glass-theme-preview" glass>
    <header><h2>Brand theme</h2></header>
    <div style="display: grid; gap: 0.45rem;">
      <lumen-label for="ex-glass-theme-hue">Brand hue</lumen-label>
      <lumen-slider
        id="ex-glass-theme-hue"
        data-ui-theme-brand-hue
        min="0"
        max="359"
        value="264"></lumen-slider>
      <lumen-label for="ex-glass-theme-accent">Accent hue</lumen-label>
      <lumen-slider
        id="ex-glass-theme-accent"
        data-ui-theme-accent-hue
        min="0"
        max="359"
        value="54"></lumen-slider>
    </div>
    <div id="ex-glass-theme-preview" style="display: flex; gap: 0.5rem; padding: 0.5rem;">
      <span data-ui-swatch style="--ui-swatch:hsl(var(--brand))"></span>
      <span data-ui-swatch style="--ui-swatch:hsl(var(--accent))"></span>
    </div>
    <div style="display: flex; gap: 0.5rem; flex-wrap: wrap;">
      <lumen-button data-ui-theme-export>Export CSS</lumen-button>
      <lumen-button variant="outline" data-ui-theme-import>Import CSS</lumen-button>
      <lumen-button variant="secondary" data-ui-theme-check-contrast>Fix Contrast</lumen-button>
    </div>
    <lumen-textarea data-ui-theme-output aria-label="Theme CSS"></lumen-textarea>
  </lumen-theme-builder>
</div>

Edit ThemeBuilder in browser

API reference

Lumen-specific props and runtime attributes for the Astro primitive. Use the framework differences above and the copyable examples for React composition and Elements attributes; the public adapter types define their supported contracts.

Attribute	Values	Default	Description
glass	boolean \| "subtle" \| "strong"	false	Applies the tokenized liquid-glass surface treatment with backdrop-filter fallbacks; "subtle" and "strong" adjust the fill intensity.
data-ui-theme-target	CSS selector	documentElement	Selects the element that receives generated theme variables.
data-ui-theme-brand-hue	range or number input	-	Controls the generated brand hue.
data-ui-theme-export	button attribute	-	Exports the current theme in the selected CSS, Figma, or design-token format.
class, className	string	""	Merges custom classes with the generated ui-* root classes.
...native attributes	HTML attributes	-	Forwards standard attributes to the root element unless the component consumes them.

Runtime events

CustomEvents dispatched by the Astro UIPrimitives runtime for this component.

Event	Target	Detail	When
ui:theme-change	ThemeBuilder root ([data-ui-theme-builder])	{ hue: number, accentHue: number, mode: 'generated' \| 'manual', scheme: 'dark' \| 'light', tokens: Record<string, string> }	Fires after ThemeBuilder hue, manual color, mode, or scheme controls update theme tokens on the target element.
ui:theme-export	ThemeBuilder root ([data-ui-theme-builder])	{ css?: string, format: 'css' \| 'figma' \| 'tokens', tokens: Record<string, string> \| null, value: string }	Fires after a [data-ui-theme-export] control writes the selected CSS, Figma, or design-token export to the output and clipboard when available.

Framework example

Add this component

Glass

API reference

Runtime events

Help improve ThemeBuilder