# Feature Grid (Lumen Halo): prompt.md (v1.0.0)

- id: `lumen-feature-grid` · version 1.0.0 · block · pro (Pro)
- category: Marketing
- build: Base UI (one set of files; its dependencies follow the build)
- install (this build): `npx shadcn@latest add @beautiful-ui-pro/lumen-feature-grid`
- npm dependencies: none
- registry dependencies: utils, https://beautiful-ui.dev/r/lumen-foundation.json
- docs: https://beautiful-ui.dev/components/lumen-feature-grid
- The install command carries everything this item needs (files, CSS, tokens, npm and registry dependencies). Prefer it to copying source by hand.

What the product does, as a grid of cards: an icon, a title and a sentence each, and wide cards that carry a small piece of real UI to show the feature instead of describing it. A soft light follows the pointer so the grid reads as one surface.

## Build it
- Stack: React 19 (`ref` is a plain prop), TypeScript, Tailwind CSS v4 utilities, a shadcn-initialised project with the `@/*` alias.
- Packages: none beyond React.
- Files: `components/ui/lumen/blocks/feature-grid.tsx`.
- Registry dependencies, installed with it automatically: shadcn `utils` (cn), `lumen-foundation`.
- Builds: one set of files for both, but its dependencies come in Base UI and Radix builds. Install the one that matches the project (see Install): a free item's bare URL installs the Base UI build of it and its dependencies.
- Exports to keep: `FeatureGrid`, and every exported type.
- CSS: the install merges this item's rules (the registry `css` field) into your global stylesheet, in `@layer components`, and adds the lumen foundation (tokens, keyframes, motion levels) once. Nothing to import by hand.
- Re-running `add` (or `--overwrite`) re-applies those rules: put overrides in your own CSS, never in the installed rules.
- Tokens: retheme with the `--lumen-*` custom properties (`--lumen-accent`, `--lumen-accent-foreground`, `--lumen-accent-text`, `--lumen-bad`, `--lumen-bad-text`, `--lumen-chart-accent`, `--lumen-chart-accent-foreground`, `--lumen-chart-accent-text`, `--lumen-focus`, `--lumen-good`, `--lumen-good-text`, `--lumen-hairline`, `--lumen-ink`, `--lumen-muted-ink`, `--lumen-series-1`, `--lumen-series-2`, `--lumen-series-3`, `--lumen-series-4`, `--lumen-series-5`, `--lumen-series-6`, `--lumen-warn`, `--lumen-warn-text`); this item's CSS also reads `--lumen-font-mono`, `--lumen-font-sans`, `--lumen-radius-k`. Never add Tailwind colour classes inside the component.

```tsx
import { FeatureGrid } from "@/components/ui/lumen/blocks/feature-grid";
```

## Parts

| Part | data-slot | What it is for |
|---|---|---|
| `FeatureGrid` | `feature-grid` | The heading block and the cards. |

Style a part with `[data-slot="<slot>"]` selectors or its `className`; keep the attributes when editing.

## Sound
- Keep every `data-slot` and `data-sound` attribute: the sound layer reads them.
- Installing this item adds no audio. Nothing plays until the app mounts `GlassSoundProvider` once (install: `npx shadcn@latest add https://beautiful-ui.dev/r/glass-sound.json`, import from `@/components/beautiful-ui/glass-sound`); `GlassSoundToggle` is its mute control. Without a provider the audio engine never loads.

## Match the original
- Read `components/ui/lumen/blocks/feature-grid.tsx` as the reference implementation before changing or recreating anything, and match it: sizes, colours per theme, motion timings, copy and behaviour.
- If you deviate (a prop you can't honour, a style you changed, a dependency you swapped), say so in your reply, part by part.
- Keep the accessibility contract, the keyboard map and the motion levels listed below.

## Use it when
- features section, feature grid, bento grid, capabilities, why us, product features, landing page features
- A landing page's features section
- A product page listing capabilities

### Not when
- Comparing plans: use Pricing Plans
- A step-by-step story: use a stepper or a sequence of sections

## Mistakes
- Don't put buttons inside a card with href (nested interactive elements)
- Keep visuals small and real; screenshots belong in a hero

## Usage

```tsx
import { FeatureGrid } from "@/components/ui/lumen/blocks/feature-grid";
import { Switch } from "@/components/ui/lumen/switch";

export function Features() {
  return (
    <FeatureGrid
      eyebrow="Why teams switch"
      title="Everything in one calm place"
      features={[
        { id: "alerts", wide: true, title: "Alerts you can trust", description: "Only when a number really moves, with the chart attached.", visual: <Switch defaultChecked aria-label="Alerts on" /> },
        { id: "share", title: "Share anything", description: "Every chart has a link that stays up to date." },
        { id: "api", title: "An API for everything", description: "Every number you see, available to your code." },
      ]}
    />
  );
}
```

## Props

| Prop | Type | Default | What it does |
|---|---|---|---|
| `features` | `Feature[]` |  | Feature = { id, title, description, icon?, visual?, wide?, href? }. visual is any node (a mini chart, a toggle, a code line); wide spans two columns. |
| `eyebrow / title / description` | `ReactNode` |  | The heading block above the grid. |
| `columns` | `2 \| 3 \| 4` | `3` | Columns on wide screens (two under 860px, one under 520px). |
| `glow` | `boolean` | `true` | The light that follows the pointer (mouse only; off under reduced motion). |

Full docs: https://beautiful-ui.dev/components/lumen-feature-grid

## Customising
- Colours: set the `--lumen-*` tokens on `:root`, or on a container with the `lumen-scope` class to retheme one area. Add the `lumen-inherit` class to follow your shadcn palette instead (`--chart-N`, `--destructive`).
- Dark mode follows the `.dark` class on an ancestor (the shadcn and next-themes convention).
- Update later by re-running the install with `--overwrite` (review the diff if you edited it). Changelog: https://beautiful-ui.dev/r/changelog.json

## Keyboard

| Keys | Action |
|---|---|
| Tab | Each card that links somewhere |

## Performance

- The pointer light writes two CSS variables per card per move; no React renders. Fine for a dozen cards

## Responsive

- Columns step down to two under 860px and one under 520px, where wide cards become normal width

## Motion inventory

| Interaction | What moves |
|---|---|
| Pointer | A soft light and a brighter rim follow the mouse across the cards |

## Accessibility contract (preserve when editing)
- Cards are list items with real headings; a card with href is one link, so its whole surface is a single tab stop
- Visuals are decorative (aria-hidden): say what they show in the description
- The pointer light is decoration only and switches off for touch and reduced motion

## Install

```bash
npx shadcn@latest add @beautiful-ui-pro/lumen-feature-grid
```

Pro item: needs the `@beautiful-ui-pro` registry in `components.json` and `BEAUTIFUL_UI_TOKEN` in `.env.local` (https://beautiful-ui.dev/account). Setup: https://beautiful-ui.dev/docs/pro. Your components.json `style` picks the build: radix-*, new-york and default get Radix, base-* gets Base UI.

The lumen foundation (the tokens listed above, keyframes and motion levels) installs once with the first component; its CSS is public at https://beautiful-ui.dev/r/lumen-foundation.json.