# Yahoo gradient

Gradients derived from Yahoo'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/yahoo-com
- Brand colors: https://brandsweets.com/colors/brands/yahoo-com · Brand page: https://brandsweets.com/b/yahoo-com
- Palette: primary #1a1919, secondary #7d2eff, accents #0f69ff
- Source: https://yahoo.com (extracted 2026-09-02)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #1a1919 0%, #7d2eff 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#1a1919] to-[#7d2eff]`
- Contrast (worst point): white 5.67:1 AA · black 1.20:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.1a1919-7d2eff?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, #1a1919 0%, #7266a4 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#1a1919] to-[#7266a4]`
- Contrast (worst point): white 5.06:1 AA · black 1.20:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.1a1919-7266a4?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 14.31:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #232222 0%, #111010 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#232222] to-[#111010]`
- Contrast (worst point): white 15.87:1 AA · black 1.10:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.232222-111010?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #2b2a2a 0%, #181717 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #1c1b1b 0%, #0b0a0a 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #474646 0%, #1a1919 50%, #000000 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#474646] via-[#1a1919] to-[#000000]`
- Contrast (worst point): white 9.41:1 AA · black 1.00:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.474646-1a1919-000000?a=135&in=oklch&hue=shorter

## Analogous

Primary #1a1919 is achromatic — harmony rotates #7d2eff instead. Partner hue from the analogous rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #7d2eff 0%, #0060fa 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#7d2eff] to-[#0060fa]`
- Contrast (worst point): white 5.17:1 AA · black 3.71:1 AA-large · banding high
- Maker: https://brandsweets.com/gradients/new/v1.7d2eff-0060fa?a=135

## Complementary

Primary #1a1919 is achromatic — harmony rotates #7d2eff 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, #7d2eff 0%, #747700 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#7d2eff] to-[#747700]`
- Contrast (worst point): white 4.38:1 AA-large · black 3.70:1 AA-large · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.7d2eff-747700?a=135&in=oklch&hue=shorter

## Triadic

Primary #1a1919 is achromatic — harmony rotates #7d2eff instead. Partner hue from the triadic rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #7d2eff 0%, #af5300 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#7d2eff] to-[#af5300]`
- Contrast (worst point): white 5.13:1 AA · black 3.71:1 AA-large · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.7d2eff-af5300?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 5.67:1 AA, black 1.20:1 */
  --brand-gradient: linear-gradient(135deg in oklab, #1a1919 0%, #7d2eff 100%);
  /* hero — worst-case contrast: white 5.06:1 AA, black 1.20:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #1a1919 0%, #7266a4 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 15.87:1 AA, black 1.10:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #232222 0%, #111010 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #2b2a2a 0%, #181717 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #1c1b1b 0%, #0b0a0a 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.