# Square gradient

Gradients derived from Square'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/squareup-com
- Brand colors: https://brandsweets.com/colors/brands/squareup-com · Brand page: https://brandsweets.com/b/squareup-com
- Palette: primary #006aff, secondary #005ad9, accents #006aff
- Source: https://squareup.com (extracted 2026-09-02)

## Brand gradient

ΔE_OK 0.070 < 0.15 between #006aff and #005ad9 — a 2-stop would read as a flat fill, so this is a tonal ramp of #006aff.

- CSS: `linear-gradient(135deg in oklch shorter hue, #75adff 0%, #006aff 50%, #0029c0 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#75adff] via-[#006aff] to-[#0029c0]`
- Contrast (worst point): white 2.29:1 fail · black 2.08:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.75adff-006aff-0029c0?a=135&in=oklch&hue=shorter

## Hero background

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). L shifted −0.18 until the ink passes AA at the worst point (4.56:1).

- CSS: `linear-gradient(135deg in oklch shorter hue, #647794 0%, #254273 50%, #0a103d 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#647794] via-[#254273] to-[#0a103d]`
- Contrast (worst point): white 4.56:1 AA · black 1.15:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.647794-254273-0a103d?a=135&in=oklch&hue=shorter

## 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 −0.06 so white ink passes AA on the surface and both states (worst 4.53:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #0063f8 0%, #0048dc 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#0063f8] to-[#0048dc]`
- Contrast (worst point): white 5.07:1 AA · black 2.96:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.0063f8-0048dc?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #076dff 0%, #0052e6 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #0059ed 0%, #003dd1 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #75adff 0%, #006aff 50%, #0029c0 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#75adff] via-[#006aff] to-[#0029c0]`
- Contrast (worst point): white 2.29:1 fail · black 2.08:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.75adff-006aff-0029c0?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, #006aff 0%, #0083ae 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#006aff] to-[#0083ae]`
- Contrast (worst point): white 4.30:1 AA-large · black 4.49:1 AA-large · banding high
- Maker: https://brandsweets.com/gradients/new/v1.006aff-0083ae?a=135

## Complementary

Partner hue from the complementary rule at the source colour's lightness. ΔH 179° > 140° — interpolating in oklch (shorter hue) keeps the midpoint saturated.

- CSS: `linear-gradient(135deg in oklch shorter hue, #006aff 0%, #9c6e00 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#006aff] to-[#9c6e00]`
- Contrast (worst point): white 4.52:1 AA · black 4.24:1 AA-large · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.006aff-9c6e00?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, #006aff 0%, #df0039 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#006aff] to-[#df0039]`
- Contrast (worst point): white 4.62:1 AA · black 4.18:1 AA-large · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.006aff-df0039?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 2.29:1, black 2.08:1 */
  --brand-gradient: linear-gradient(135deg in oklch shorter hue, #75adff 0%, #006aff 50%, #0029c0 100%);
  /* hero — worst-case contrast: white 4.56:1 AA, black 1.15:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklch shorter hue, #647794 0%, #254273 50%, #0a103d 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 5.07:1 AA, black 2.96:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #0063f8 0%, #0048dc 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #076dff 0%, #0052e6 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #0059ed 0%, #003dd1 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.