# Coinbase gradient

Gradients derived from Coinbase'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/coinbase
- Brand colors: https://brandsweets.com/colors/brands/coinbase · Brand page: https://brandsweets.com/b/coinbase
- Palette: primary #0052ff
- Source: https://coinbase.com (extracted 2026-08-30)

## Brand gradient

No secondary or accent — the second stop is derived (analogous +30° at the primary's lightness).

- CSS: `linear-gradient(135deg in oklab, #0052ff 0%, #7d04ff 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0052ff] to-[#7d04ff]`
- Contrast (worst point): white 5.73:1 AA · black 3.33:1 AA-large · banding high
- Maker: https://brandsweets.com/gradients/new/v1.0052ff-7d04ff?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 (5.35:1) without adjusting L.

- CSS: `linear-gradient(135deg in oklab, #4f6aa1 0%, #6e5fa1 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#4f6aa1] to-[#6e5fa1]`
- Contrast (worst point): white 5.35:1 AA · black 3.80:1 AA-large · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.4f6aa1-6e5fa1?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. L shifted −0.01 so white ink passes AA on the surface and both states (worst 4.55:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #0d5dff 0%, #003fed 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#0d5dff] to-[#003fed]`
- Contrast (worst point): white 5.21:1 AA · black 2.93:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.0d5dff-003fed?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #226bff 0%, #004bf8 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #0052ff 0%, #0032e2 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #659cff 0%, #0052ff 50%, #0000bf 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#659cff] via-[#0052ff] to-[#0000bf]`
- Contrast (worst point): white 2.71:1 fail · black 1.75:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.659cff-0052ff-0000bf?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, #0052ff 0%, #0075a0 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0052ff] to-[#0075a0]`
- Contrast (worst point): white 5.16:1 AA · black 3.64:1 AA-large · banding high
- Maker: https://brandsweets.com/gradients/new/v1.0052ff-0075a0?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, #0052ff 0%, #8a6400 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#0052ff] to-[#8a6400]`
- Contrast (worst point): white 5.38:1 AA · black 3.48:1 AA-large · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.0052ff-8a6400?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, #0052ff 0%, #c90029 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0052ff] to-[#c90029]`
- Contrast (worst point): white 5.60:1 AA · black 3.50:1 AA-large · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.0052ff-c90029?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 5.73:1 AA, black 3.33:1 AA-large */
  --brand-gradient: linear-gradient(135deg in oklab, #0052ff 0%, #7d04ff 100%);
  /* hero — worst-case contrast: white 5.35:1 AA, black 3.80:1 AA-large; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #4f6aa1 0%, #6e5fa1 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 5.21:1 AA, black 2.93:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #0d5dff 0%, #003fed 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #226bff 0%, #004bf8 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #0052ff 0%, #0032e2 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.