website-design-system

Design

Envilder website design system: themes, CSS variables, breakpoints, spacing, typography, and component patterns. Use when creating or editing Astro components, adding CSS, or styling website pages. Ensures visual consistency across retro and light themes.

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Source SKILL.md: https://github.com/macalbert/envilder/blob/HEAD/.github/skills/website-design-system/SKILL.md

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Website Design System

Rules and patterns for the Envilder website's pure CSS design system.

When to Use

Creating new Astro components or page sections
Adding or modifying CSS (global or scoped)
Choosing between existing utility classes
Defining new CSS variables
Reviewing PRs that touch website styling

Themes

The site uses data-theme attribute on <html>. Two themes are supported:

Theme	Selector	Palette
Retro (default)	`:root`	Game Boy green
Light	`[data-theme="light"]`	Warm neutrals

Rules

All colors MUST use CSS variables: never hardcode hex values
New variables MUST be defined in both :root (retro) and [data-theme="light"] blocks in global.css
Never modify the theme switcher mechanism or its localStorage key

/* ✓ Correct */
color: var(--color-text);
background: var(--color-bg);

/* ✗ NEVER */
color: #8bac0f;
background: #1a1a2e;

Responsive Breakpoints

Mobile-first approach. Default styles target mobile; expand with min-width.

Breakpoint	Target	Pattern
Default	Mobile	Single column, compact spacing
`min-width: 640px`	Tablet	2-column grids, expanded spacing
`min-width: 1024px`	Desktop	3-4 column grids, full layout

Grid Utilities

Use existing grid classes: .grid-2, .grid-3, .grid-4.

Spacing & Layout

Use the spacing scale defined in global.css:

Variables: --space-xs through --space-4xl
Container max-width: --max-width (1200px)

Typography

Use	Font	Access
Section titles / pixel style	Press Start 2P	Via `.pixel-card h3` or custom class
Body text	Inter	Default (inherited)
Code / terminal	JetBrains Mono	`<code>`, `<pre>`, or mono class

Use clamp() for fluid typography
Never use fixed px font sizes

Component Patterns

Reuse existing CSS classes for visual consistency:

Class	Purpose
`.pixel-card`	Bordered cards with pixel corner notches
`.pixel-icon`	Emoji with pixelated filter
`.pixel-shadow`	4px offset retro shadow
`.badge`	Small label badges
`.pixel-divider`	Section separator
`.scanlines`	CRT overlay effect (use sparingly)
`.section`	Standard section wrapper with vertical padding

File Locations

What	Where
Global CSS	`src/website/src/styles/global.css`
Components	`src/website/src/components/*.astro`
Layout	`src/website/src/layouts/BaseLayout.astro`

Constraints

DO NOT install CSS frameworks or UI libraries: use existing pure CSS
DO NOT hardcode colors: always CSS variables from global.css
DO NOT use fixed pixel font sizes: use clamp() or relative units
DO NOT break existing responsive layouts when adding new sections
DO NOT add JavaScript frameworks (React, Vue): Astro components + <script> tags only
ONLY add new CSS variables if defined in both theme blocks