# Mercury gradient

Gradients derived from Mercury'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/mercury-com
- Brand colors: https://brandsweets.com/colors/brands/mercury-com · Brand page: https://brandsweets.com/b/mercury-com
- Palette: primary #323341, secondary #9cb4e8, accents #fc92b4
- Source: https://mercury.com (extracted 2026-09-02)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #323341 0%, #9cb4e8 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#323341] to-[#9cb4e8]`
- Contrast (worst point): white 2.08:1 fail · black 1.69:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.323341-9cb4e8?a=135

## Hero background

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). L shifted −0.21 until the ink passes AA at the worst point (4.57:1).

- CSS: `linear-gradient(135deg in oklab, #08080c 0%, #6d7688 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#08080c] to-[#6d7688]`
- Contrast (worst point): white 4.57:1 AA · black 1.05:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.08080c-6d7688?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 9.44:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #3c3d4c 0%, #282937 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#3c3d4c] to-[#282937]`
- Contrast (worst point): white 10.69:1 AA · black 1.46:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.3c3d4c-282937?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #444554 0%, #2f303e 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #353644 0%, #21222f 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #626473 0%, #323341 50%, #090914 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#626473] via-[#323341] to-[#090914]`
- Contrast (worst point): white 5.85:1 AA · black 1.06:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.626473-323341-090914?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, #323341 0%, #30353b 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#323341] to-[#30353b]`
- Contrast (worst point): white 12.30:1 AA · black 1.68:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.323341-30353b?a=135

## Complementary

Partner hue from the complementary rule at the source colour's lightness. ΔH 175° > 140° — interpolating in oklch (shorter hue) keeps the midpoint saturated.

- CSS: `linear-gradient(135deg in oklch shorter hue, #323341 0%, #353530 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#323341] to-[#353530]`
- Contrast (worst point): white 12.22:1 AA · black 1.68:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.323341-353530?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, #323341 0%, #3a322f 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#323341] to-[#3a322f]`
- Contrast (worst point): white 12.42:1 AA · black 1.67:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.323341-3a322f?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 2.08:1, black 1.69:1 */
  --brand-gradient: linear-gradient(135deg in oklab, #323341 0%, #9cb4e8 100%);
  /* hero — worst-case contrast: white 4.57:1 AA, black 1.05:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #08080c 0%, #6d7688 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 10.69:1 AA, black 1.46:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #3c3d4c 0%, #282937 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #444554 0%, #2f303e 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #353644 0%, #21222f 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.