# Logitech gradient

Gradients derived from Logitech'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/logitech-com
- Brand colors: https://brandsweets.com/colors/brands/logitech-com · Brand page: https://brandsweets.com/b/logitech-com
- Palette: primary #1b1b1b, secondary #ff0000, accents #0d3a38
- Source: https://logitech.com (extracted 2026-09-03)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #1b1b1b 0%, #ff0000 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#1b1b1b] to-[#ff0000]`
- Contrast (worst point): white 4.00:1 AA-large · black 1.22:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.1b1b1b-ff0000?a=135

## Hero background

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). L shifted −0.06 until the ink passes AA at the worst point (4.68:1).

- CSS: `linear-gradient(135deg in oklab, #0f0f0f 0%, #a76157 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0f0f0f] to-[#a76157]`
- Contrast (worst point): white 4.68:1 AA · black 1.10:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.0f0f0f-a76157?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 13.96:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #242424 0%, #121212 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#242424] to-[#121212]`
- Contrast (worst point): white 15.52:1 AA · black 1.12:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.242424-121212?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #2c2c2c 0%, #191919 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #1d1d1d 0%, #0c0c0c 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #484848 0%, #1b1b1b 50%, #000000 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#484848] via-[#1b1b1b] to-[#000000]`
- Contrast (worst point): white 9.15:1 AA · black 1.00:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.484848-1b1b1b-000000?a=135&in=oklch&hue=shorter

## Analogous

Primary #1b1b1b is achromatic — harmony rotates #ff0000 instead. Partner hue from the analogous rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #ff0000 0%, #f40084 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#ff0000] to-[#f40084]`
- Contrast (worst point): white 3.98:1 AA-large · black 5.17:1 AA · banding high
- Maker: https://brandsweets.com/gradients/new/v1.ff0000-f40084?a=135

## Complementary

Primary #1b1b1b is achromatic — harmony rotates #ff0000 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, #ff0000 0%, #009aac 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#ff0000] to-[#009aac]`
- Contrast (worst point): white 3.36:1 AA-large · black 5.23:1 AA · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.ff0000-009aac?a=135&in=oklch&hue=shorter

## Triadic

Primary #1b1b1b is achromatic — harmony rotates #ff0000 instead. Partner hue from the triadic rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #ff0000 0%, #00a447 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#ff0000] to-[#00a447]`
- Contrast (worst point): white 3.27:1 AA-large · black 5.24:1 AA · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.ff0000-00a447?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 4.00:1 AA-large, black 1.22:1 */
  --brand-gradient: linear-gradient(135deg in oklab, #1b1b1b 0%, #ff0000 100%);
  /* hero — worst-case contrast: white 4.68:1 AA, black 1.10:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #0f0f0f 0%, #a76157 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 15.52:1 AA, black 1.12:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #242424 0%, #121212 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #2c2c2c 0%, #191919 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #1d1d1d 0%, #0c0c0c 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.