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

Framework usage

Switch targets to compare the adapter code. The preview stays visually stable because all three packages share the same tokens and ui-* class contract.

---
import { Label, 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>
    <input
      id="ex-theme-hue"
      data-ui-theme-brand-hue
      type="range"
      class="ui-slider"
      min="0"
      max="359"
      value="264"
    />
    <Label for="ex-theme-accent">Accent hue</Label>
    <input
      id="ex-theme-accent"
      data-ui-theme-accent-hue
      type="range"
      class="ui-slider"
      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 class="ui-button" data-ui-theme-export type="button">Export CSS</button>
    <button class="ui-button ui-button--outline" data-ui-theme-import type="button">Import CSS</button>
    <button class="ui-button ui-button--secondary" data-ui-theme-check-contrast type="button">Fix Contrast</button>
  </div>
  <textarea class="ui-textarea" data-ui-theme-output aria-label="Theme CSS"></textarea>
</ThemeBuilder>

import { Label, ThemeBuilder } from '@santi020k/lumen-react'

export const Example = () => (
  <>
    <ThemeBuilder data-ui-theme-target="#ex-theme-preview">
      <header><h3>Brand theme</h3></header>
      <div style={{ display: 'grid', gap: '0.45rem' }}>
        <Label htmlFor="ex-theme-hue">Brand hue</Label>
        <input
          id="ex-theme-hue"
          data-ui-theme-brand-hue
          type="range"
          className="ui-slider"
          min="0"
          max="359"
          value="264"
        />
        <Label htmlFor="ex-theme-accent">Accent hue</Label>
        <input
          id="ex-theme-accent"
          data-ui-theme-accent-hue
          type="range"
          className="ui-slider"
          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={{ -UiSwatch: 'hsl(var(--brand))' }}></span>
        <span data-ui-swatch style={{ -UiSwatch: 'hsl(var(--accent))' }}></span>
      </div>
      <div style={{ display: 'flex', gap: '0.5rem', flexWrap: 'wrap' }}>
        <button className="ui-button" data-ui-theme-export type="button">Export CSS</button>
        <button className="ui-button ui-button--outline" data-ui-theme-import type="button">Import CSS</button>
        <button className="ui-button ui-button--secondary" data-ui-theme-check-contrast type="button">Fix Contrast</button>
      </div>
      <textarea className="ui-textarea" data-ui-theme-output aria-label="Theme CSS"></textarea>
    </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>
    <input
      id="ex-theme-hue"
      data-ui-theme-brand-hue
      type="range"
      class="ui-slider"
      min="0"
      max="359"
      value="264"
    />
    <lumen-label for="ex-theme-accent">Accent hue</lumen-label>
    <input
      id="ex-theme-accent"
      data-ui-theme-accent-hue
      type="range"
      class="ui-slider"
      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 class="ui-button" data-ui-theme-export type="button">Export CSS</button>
    <button class="ui-button ui-button--outline" data-ui-theme-import type="button">Import CSS</button>
    <button class="ui-button ui-button--secondary" data-ui-theme-check-contrast type="button">Fix Contrast</button>
  </div>
  <textarea class="ui-textarea" data-ui-theme-output aria-label="Theme CSS"></textarea>
</lumen-theme-builder>

Edit ThemeBuilder in browser

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

Framework usage

Switch targets to compare the adapter code. The preview stays visually stable because all three packages share the same tokens and ui-* class contract.

---
import { Label, 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>
      <input
        id="ex-glass-theme-hue"
        data-ui-theme-brand-hue
        type="range"
        class="ui-slider"
        min="0"
        max="359"
        value="264"
      />
      <Label for="ex-glass-theme-accent">Accent hue</Label>
      <input
        id="ex-glass-theme-accent"
        data-ui-theme-accent-hue
        type="range"
        class="ui-slider"
        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 class="ui-button" data-ui-theme-export type="button">Export CSS</button>
      <button class="ui-button ui-button--outline" data-ui-theme-import type="button">Import CSS</button>
      <button class="ui-button ui-button--secondary" data-ui-theme-check-contrast type="button">Fix Contrast</button>
    </div>
    <textarea class="ui-textarea" data-ui-theme-output aria-label="Theme CSS"></textarea>
  </ThemeBuilder>
</div>

import { Label, ThemeBuilder } from '@santi020k/lumen-react'

export const Example = () => (
  <>
    <div className="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 htmlFor="ex-glass-theme-hue">Brand hue</Label>
          <input
            id="ex-glass-theme-hue"
            data-ui-theme-brand-hue
            type="range"
            className="ui-slider"
            min="0"
            max="359"
            value="264"
          />
          <Label htmlFor="ex-glass-theme-accent">Accent hue</Label>
          <input
            id="ex-glass-theme-accent"
            data-ui-theme-accent-hue
            type="range"
            className="ui-slider"
            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={{ -UiSwatch: 'hsl(var(--brand))' }}></span>
          <span data-ui-swatch style={{ -UiSwatch: 'hsl(var(--accent))' }}></span>
        </div>
        <div style={{ display: 'flex', gap: '0.5rem', flexWrap: 'wrap' }}>
          <button className="ui-button" data-ui-theme-export type="button">Export CSS</button>
          <button className="ui-button ui-button--outline" data-ui-theme-import type="button">Import CSS</button>
          <button className="ui-button ui-button--secondary" data-ui-theme-check-contrast type="button">Fix Contrast</button>
        </div>
        <textarea className="ui-textarea" data-ui-theme-output aria-label="Theme CSS"></textarea>
      </ThemeBuilder>
    </div>
  </>
)

<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>
      <input
        id="ex-glass-theme-hue"
        data-ui-theme-brand-hue
        type="range"
        class="ui-slider"
        min="0"
        max="359"
        value="264"
      />
      <lumen-label for="ex-glass-theme-accent">Accent hue</lumen-label>
      <input
        id="ex-glass-theme-accent"
        data-ui-theme-accent-hue
        type="range"
        class="ui-slider"
        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 class="ui-button" data-ui-theme-export type="button">Export CSS</button>
      <button class="ui-button ui-button--outline" data-ui-theme-import type="button">Import CSS</button>
      <button class="ui-button ui-button--secondary" data-ui-theme-check-contrast type="button">Fix Contrast</button>
    </div>
    <textarea class="ui-textarea" data-ui-theme-output aria-label="Theme CSS"></textarea>
  </lumen-theme-builder>
</div>

Edit ThemeBuilder in browser

API reference

Lumen-specific props and runtime attributes for the Astro primitive. React props follow the same names; Elements use equivalent kebab-case attributes where custom elements expose them.

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	ThemeToggle control ([data-ui-theme-toggle])	{ previousTheme?: string, storageKey: string, theme: string }	Fires after ThemeToggle applies and persists a new document theme.
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.