CSS Variables Reference

This page lists all CSS custom properties available in Editu. Color values use the OKLCH color space for perceptual uniformity and wider gamut support.

Overview

Editu provides CSS custom properties for theming. The following categories organize these variables:

Category	Description
Colors	Primary, secondary, background, foreground, and state colors
Typography	Font families, sizes, weights, and line heights
Spacing & Layout	Spacing scale, border radius, shadows, and z-index
Components	Editor, image, code block, and math-specific variables
Integrations	Tailwind CSS and shadcn/ui integration guides

Why OKLCH?

Editu uses the OKLCH color space for all color values because:

1. Perceptual uniformity — Colors with the same lightness value appear equally bright
2. Predictable manipulation — Adjusting hue, chroma, or lightness produces predictable results
3. Wider gamut — Provides access to colors beyond sRGB on supported displays
4. Dark mode — Simplifies creating accessible color variations

OKLCH is supported in all modern browsers (Chrome 111+, Firefox 113+, Safari 15.4+).

Theme Selectors

These CSS selectors trigger theme changes:

/* Light theme (default) */
:root,
.light,
[data-theme="light"],
[data-editu-theme="light"] {
  /* Light theme variables */
}

/* Dark theme */
.dark,
[data-theme="dark"],
[data-editu-theme="dark"] {
  /* Dark theme variables */
}

Quick Example

/* Custom theme overrides using OKLCH */
:root {
  /* Custom primary color (purple) */
  --editu-primary: oklch(0.627 0.265 303.9);
  --editu-primary-hover: oklch(0.558 0.288 302.321);
  
  /* Custom border radius */
  --editu-radius-md: 8px;
  --editu-radius-lg: 12px;
  
  /* Custom editor settings */
  --editu-editor-min-height: 500px;
}

[data-editu-theme="dark"] {
  --editu-primary: oklch(0.714 0.203 305.504);
}

Next Steps

• Color Variables - All color tokens with light/dark values
• Typography Variables - Font families, sizes, and weights
• Spacing & Layout - Spacing, radius, shadows, and z-index
• Component Variables - Editor and component-specific tokens
• Integrations - Tailwind CSS and shadcn/ui setup