# Wikipedia gradient

Gradients derived from Wikipedia's published colour tokens (nominative use; no brand assets). Deterministic: the same values are served as `--brand-gradient*` in the brand's brand.css.

- Page: https://brandsweets.com/gradients/brands/wikipedia-org
- Brand colors: https://brandsweets.com/colors/brands/wikipedia-org · Brand page: https://brandsweets.com/b/wikipedia-org
- Palette: primary #202122, secondary #3366cc, accents #f0bc00
- Source: https://wikipedia.org (extracted 2026-09-02)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #202122 0%, #3366cc 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#202122] to-[#3366cc]`
- Contrast (worst point): white 5.37:1 AA · black 1.30:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.202122-3366cc?a=135

## Hero background

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). Passes AA for that ink at the worst point (5.22:1) without adjusting L.

- CSS: `linear-gradient(135deg in oklab, #212121 0%, #5a6d8f 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#212121] to-[#5a6d8f]`
- Contrast (worst point): white 5.22:1 AA · black 1.30:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.212121-5a6d8f?a=135

## Button / CTA

ΔL 0.08 top→bottom in the primary's hue (a lit surface, not a rainbow); hover L +0.03, active L −0.03. White ink passes AA on the surface and both states (worst 12.85:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #2a2b2c 0%, #171819 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#2a2b2c] to-[#171819]`
- Contrast (worst point): white 14.19:1 AA · black 1.18:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.2a2b2c-171819?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #313233 0%, #1e1f20 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #222324 0%, #101112 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #4e4f50 0%, #202122 50%, #010101 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#4e4f50] via-[#202122] to-[#010101]`
- Contrast (worst point): white 8.21:1 AA · black 1.01:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.4e4f50-202122-010101?a=135&in=oklch&hue=shorter

## Analogous

Partner hue from the analogous rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #202122 0%, #202121 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#202122] to-[#202121]`
- Contrast (worst point): white 16.13:1 AA · black 1.30:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.202122-202121?a=135

## Complementary

Partner hue from the complementary rule at the source colour's lightness. ΔH 180° > 140° — interpolating in oklch (shorter hue) keeps the midpoint saturated.

- CSS: `linear-gradient(135deg in oklch shorter hue, #202122 0%, #222120 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#202122] to-[#222120]`
- Contrast (worst point): white 16.05:1 AA · black 1.30:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.202122-222120?a=135&in=oklch&hue=shorter

## Triadic

Partner hue from the triadic rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #202122 0%, #232021 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#202122] to-[#232021]`
- Contrast (worst point): white 16.05:1 AA · black 1.30:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.202122-232021?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 5.37:1 AA, black 1.30:1 */
  --brand-gradient: linear-gradient(135deg in oklab, #202122 0%, #3366cc 100%);
  /* hero — worst-case contrast: white 5.22:1 AA, black 1.30:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #212121 0%, #5a6d8f 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 14.19:1 AA, black 1.18:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #2a2b2c 0%, #171819 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #313233 0%, #1e1f20 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #222324 0%, #101112 100%);
  --brand-gradient-button-ink: #ffffff;
}
```

## Gradient maker

Every maker URL is the gradient's state: `/gradients/new/v1.<hex>-<hex>[_pos]?a=135&in=oklch&hue=shorter&e=soft&g=8`. Hand one to a human, let them refine, and read the link they return.

## Connect an agent

Point any MCP client at the BrandSweets gradients endpoint for the same engine and corpus:

- Endpoint: https://mcp.brandsweets.com/gradients/mcp
- Tools: `make_gradient` (2–5 colours → CSS with the interpolation space, Tailwind v4, SVG, PNG URL, DTCG token + the contrast/banding/gamut report), `brand_gradients` (brand slug or palette → brand gradient, hero, button, variants).
- Resource: `gradients://corpus` — the whole bundled corpus as JSON.