/matlab-uihtml-design

name: matlab-uihtml-design
description: Generate beautiful, distinctive HTML/CSS/JS control panels for MATLAB uihtml components. 8 built-in styles (Clean, Material, Cosmic Dark, Neumorphic Dark, Dashboard Light, Midnight Gradient, Minimal Mono, Warm Dark) plus custom aesthetics. Produces production-grade UI with sliders, buttons, toggles, and panels. Use when building visually polished MATLAB app UIs with uihtml.
license: https://www.mathworks.com/content/dam/mathworks/license/pmrl/license.md
metadata:
  author: MathWorks
  version: "1.0"

MATLAB uihtml Design Skill

Generate production-grade HTML/CSS/JS control panels for MATLAB `uihtml` components with distinctive, configurable visual styles.

When to Use

• User wants beautiful custom controls in a MATLAB app via `uihtml`
• User asks for a specific design style (Clean, Material, dark theme, etc.)
• User wants to redesign or restyle existing `uihtml` controls
• User describes a custom aesthetic for their MATLAB app controls

Style Selection

Built-in styles are documented in `references/design-styles.md`. To apply a style:

1. If the user names a built-in style, read the corresponding file from `references/styles/<name>.md` 2. If the user describes a custom aesthetic, apply creative design thinking (see below) without loading a reference style 3. If no style is specified, **open the visual style gallery** in the user's browser so they can see all 8 styles side-by-side:

   start "" "<skill-directory>/assets/style-gallery.html"   # Windows
   open "<skill-directory>/assets/style-gallery.html"       # macOS

Then ask: "I've opened the style gallery in your browser. Which style would you like? You can also describe a custom aesthetic."

The gallery shows interactive previews of all 8 built-in styles with a Dark/Light toggle. The available styles are:

| Style | Vibe | |-------|------| | Clean | Frosted glass, depth layers, spring animations | | Material | Tonal surfaces, elevation, rounded shapes | | Cosmic Dark | Deep space, neon glow, glassmorphism | | Neumorphic Dark | Embossed/debossed, soft shadow pairs | | Dashboard Light | White cards, indigo accent, data-dense | | Midnight Gradient | Blue-to-purple gradients, luxury glow | | Minimal Mono | Ultra-flat, pill buttons, single accent | | Warm Dark | Amber/yellow accent, friendly, smart home |

If the user says "just pick one" or wants to move fast, default to Clean.

Each style reference follows the 9-section DESIGN.md format and provides complete specifications for colors, typography, components, motion, and guardrails.

Design Thinking

Before generating code, commit to a clear aesthetic direction:

• **Purpose**: What does this control panel do? Who uses it?
• **Tone**: What feeling should the interface evoke?
• **Constraints**: Container size, MATLAB integration requirements, offline (no CDN)
• **Differentiation**: What makes this memorable and cohesive?

Execute the chosen direction with precision. Bold maximalism and refined minimalism both work, as long as the choice is intentional.

Workflow

1. **Style selection**: Identify or create the aesthetic direction 2. **Component planning**: Determine which controls are needed (sliders, buttons, toggles, etc.) 3. **HTML generation**: Produce self-contained HTML with the chosen style applied 4. **MATLAB integration**: Include `setup(htmlComponent)` boilerplate; defer full MATLAB-side wiring to the `matlab-uihtml-app-builder` skill

Component Library (v1)

Sliders

• Range inputs with custom thumb and track styling
• Value display with formatted units
• Horizontal layout with label + value header

Buttons

• **Primary/Filled**: Bold accent color, prominent shadow/glow
• **Secondary/Outlined**: Transparent with border, subtle hover
• **Destructive/Danger**: Warning color for stop/reset actions
• State: default, hover, focus-visible, active (scale 0.97), disabled (see the Interactive states table in **Design Guardrails**)

Toggles

• Sliding toggle switches
• On/off states with color transition
• Keyboard-operable (focusable, toggle on Space/Enter) with accessible click/tap targets

Theme System

All styles use CSS custom properties for theming. The base architecture:

:root {
    /* Semantic colors, filled by chosen style */
    --color-bg-primary: ...;
    --color-bg-secondary: ...;
    --color-bg-surface: ...;
    --color-accent: ...;
    --color-accent-hover: ...;
    --color-text-primary: ...;
    --color-text-secondary: ...;
    --color-border: ...;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;

    /* Typography */
    --font-family: ...;
    --font-size-sm: ...;
    --font-size-md: ...;
    --font-size-lg: ...;

    /* Radii & Shadows */
    --radius-sm: ...;
    --radius-md: ...;
    --shadow-sm: ...;
    --shadow-md: ...;

    /* Motion */
    --transition-fast: ...;
    --transition-med: ...;
}

Support both light and dark modes via `prefers-color-scheme` media query or a `data-theme` attribute on `<html>`:

@media (prefers-color-scheme: dark) { ... }
/* or */
[data-theme="dark"] { ... }

Container-Aware Spacing

`uihtml` containers in MATLAB apps are often height-constrained (e.g., a narrow side panel). When applying any style:

• **Read the existing HTML first** to understand how many controls need to fit
• **Prioritize fitting all controls** over matching the style's ideal spacing. Reduce padding, gaps, and font sizes as needed; the neumorphic effect still works at 16px padding and 16px gaps
• **Use compact variants** when the container holds more than 2 panels: body padding 14px, panel padding 16px, inter-panel gap 16px, button padding 9px 18px
• **Padding has a floor.** Even when compacting, keep ~12px of padding inside a bordered or tinted panel (8px absolute minimum). Trim inter-panel gaps and font sizes before you starve the panel's own padding.