# GitHub gradient

Gradients derived from GitHub'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/github
- Brand colors: https://brandsweets.com/colors/brands/github · Brand page: https://brandsweets.com/b/github
- Palette: primary #181717, secondary #0969da, accents #0969da
- Source: https://github.com (extracted 2026-09-02)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #181717 0%, #0969da 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#181717] to-[#0969da]`
- Contrast (worst point): white 5.19:1 AA · black 1.17:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.181717-0969da?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 (5.06:1) without adjusting L.

- CSS: `linear-gradient(135deg in oklab, #181717 0%, #567095 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#181717] to-[#567095]`
- Contrast (worst point): white 5.06:1 AA · black 1.17:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.181717-567095?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 14.85:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #212020 0%, #0f0e0e 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#212020] to-[#0f0e0e]`
- Contrast (worst point): white 16.25:1 AA · black 1.09:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.212020-0f0e0e?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #292727 0%, #161515 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #1a1919 0%, #090808 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #454343 0%, #181717 50%, #000000 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#454343] via-[#181717] to-[#000000]`
- Contrast (worst point): white 9.83:1 AA · black 1.00:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.454343-181717-000000?a=135&in=oklch&hue=shorter

## Analogous

Primary #181717 is achromatic — harmony rotates #0969da instead. Partner hue from the analogous rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #0969da 0%, #0c7a9d 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0969da] to-[#0c7a9d]`
- Contrast (worst point): white 4.88:1 AA · black 4.03:1 AA-large · banding high
- Maker: https://brandsweets.com/gradients/new/v1.0969da-0c7a9d?a=135

## Complementary

Primary #181717 is achromatic — harmony rotates #0969da instead. 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, #0969da 0%, #926509 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#0969da] to-[#926509]`
- Contrast (worst point): white 5.14:1 AA · black 3.79:1 AA-large · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.0969da-926509?a=135&in=oklch&hue=shorter

## Triadic

Primary #181717 is achromatic — harmony rotates #0969da instead. Partner hue from the triadic rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #0969da 0%, #cc0e3e 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0969da] to-[#cc0e3e]`
- Contrast (worst point): white 5.17:1 AA · black 3.69:1 AA-large · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.0969da-cc0e3e?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 5.19:1 AA, black 1.17:1 */
  --brand-gradient: linear-gradient(135deg in oklab, #181717 0%, #0969da 100%);
  /* hero — worst-case contrast: white 5.06:1 AA, black 1.17:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #181717 0%, #567095 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 16.25:1 AA, black 1.09:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #212020 0%, #0f0e0e 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #292727 0%, #161515 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #1a1919 0%, #090808 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.