# Uber gradient

Gradients derived from Uber'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/uber-com
- Brand colors: https://brandsweets.com/colors/brands/uber-com · Brand page: https://brandsweets.com/b/uber-com
- Palette: primary #040404, secondary #9dcdd6, accents #0000ee
- Source: https://uber.com (extracted 2026-09-02)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #040404 0%, #9dcdd6 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#040404] to-[#9dcdd6]`
- Contrast (worst point): white 1.73:1 fail · black 1.02:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.040404-9dcdd6?a=135

## Hero background

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). L shifted −0.26 until the ink passes AA at the worst point (4.54:1).

- CSS: `linear-gradient(135deg in oklab, #010101 0%, #69797c 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#010101] to-[#69797c]`
- Contrast (worst point): white 4.54:1 AA · black 1.01:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.010101-69797c?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 18.88:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #0a0a0a 0%, #010101 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#0a0a0a] to-[#010101]`
- Contrast (worst point): white 19.80:1 AA · black 1.01:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.0a0a0a-010101?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #111111 0%, #030303 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #090909 0%, #010101 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #5a5a5a 0%, #040404 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#5a5a5a] to-[#040404]`
- Contrast (worst point): white 6.90:1 AA · black 1.02:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.5a5a5a-040404?a=135&in=oklch&hue=shorter

## Analogous

Primary #040404 is achromatic — harmony rotates #9dcdd6 instead. Partner hue from the analogous rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #9dcdd6 0%, #9ecfc5 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#9dcdd6] to-[#9ecfc5]`
- Contrast (worst point): white 1.72:1 fail · black 12.10:1 AA · banding high
- Maker: https://brandsweets.com/gradients/new/v1.9dcdd6-9ecfc5?a=135

## Complementary

Primary #040404 is achromatic — harmony rotates #9dcdd6 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, #9dcdd6 0%, #dbbbb5 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#9dcdd6] to-[#dbbbb5]`
- Contrast (worst point): white 1.72:1 fail · black 11.76:1 AA · banding high
- Maker: https://brandsweets.com/gradients/new/v1.9dcdd6-dbbbb5?a=135&in=oklch&hue=shorter

## Triadic

Primary #040404 is achromatic — harmony rotates #9dcdd6 instead. Partner hue from the triadic rule at the source colour's lightness.

- CSS: `linear-gradient(135deg in oklab, #9dcdd6 0%, #dbb6d6 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#9dcdd6] to-[#dbb6d6]`
- Contrast (worst point): white 1.72:1 fail · black 11.64:1 AA · banding high
- Maker: https://brandsweets.com/gradients/new/v1.9dcdd6-dbb6d6?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 1.73:1, black 1.02:1 */
  --brand-gradient: linear-gradient(135deg in oklab, #040404 0%, #9dcdd6 100%);
  /* hero — worst-case contrast: white 4.54:1 AA, black 1.01:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #010101 0%, #69797c 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 19.80:1 AA, black 1.01:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #0a0a0a 0%, #010101 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #111111 0%, #030303 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #090909 0%, #010101 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.