# Bose gradient

Gradients derived from Bose'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/bose-com
- Brand colors: https://brandsweets.com/colors/brands/bose-com · Brand page: https://brandsweets.com/b/bose-com
- Palette: primary #131317, secondary #005bff, accents #ad0000
- Source: https://bose.com (extracted 2026-09-05)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #131317 0%, #005bff 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#131317] to-[#005bff]`
- Contrast (worst point): white 5.33:1 AA · black 1.13:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.131317-005bff?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 (5.04:1) without adjusting L.

- CSS: `linear-gradient(135deg in oklab, #131315 0%, #536fa3 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#131315] to-[#536fa3]`
- Contrast (worst point): white 5.04:1 AA · black 1.13:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.131315-536fa3?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 15.66:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #1c1c20 0%, #0a0a0e 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#1c1c20] to-[#0a0a0e]`
- Contrast (worst point): white 16.99:1 AA · black 1.06:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.1c1c20-0a0a0e?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #232327 0%, #111115 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #151519 0%, #050508 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #3f3f44 0%, #131317 50%, #000001 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#3f3f44] via-[#131317] to-[#000001]`
- Contrast (worst point): white 10.47:1 AA · black 1.00:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.3f3f44-131317-000001?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, #131317 0%, #121416 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#131317] to-[#121416]`
- Contrast (worst point): white 18.42:1 AA · black 1.13:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.131317-121416?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, #131317 0%, #141412 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#131317] to-[#141412]`
- Contrast (worst point): white 18.38:1 AA · black 1.13:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.131317-141412?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, #131317 0%, #151312 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#131317] to-[#151312]`
- Contrast (worst point): white 18.51:1 AA · black 1.13:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.131317-151312?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 5.33:1 AA, black 1.13:1 */
  --brand-gradient: linear-gradient(135deg in oklab, #131317 0%, #005bff 100%);
  /* hero — worst-case contrast: white 5.04:1 AA, black 1.13:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #131315 0%, #536fa3 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 16.99:1 AA, black 1.06:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #1c1c20 0%, #0a0a0e 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #232327 0%, #111115 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #151519 0%, #050508 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.