# AT&T gradient

Gradients derived from AT&T'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/att-com
- Brand colors: https://brandsweets.com/colors/brands/att-com · Brand page: https://brandsweets.com/b/att-com
- Palette: primary #1d2329, secondary #0072b2, accents #c70032
- Source: https://att.com (extracted 2026-09-02)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #1d2329 0%, #0072b2 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#1d2329] to-[#0072b2]`
- Contrast (worst point): white 5.18:1 AA · black 1.32:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.1d2329-0072b2?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 (5.18:1) without adjusting L.

- CSS: `linear-gradient(135deg in oklab, #202325 0%, #567085 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#202325] to-[#567085]`
- Contrast (worst point): white 5.18:1 AA · black 1.33:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.202325-567085?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 12.57:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #272d33 0%, #141a1f 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#272d33] to-[#141a1f]`
- Contrast (worst point): white 13.91:1 AA · black 1.20:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.272d33-141a1f?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #2e343b 0%, #1b2127 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #1f252b 0%, #0d1318 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #4b5158 0%, #1d2329 50%, #000103 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#4b5158] via-[#1d2329] to-[#000103]`
- Contrast (worst point): white 8.02:1 AA · black 1.01:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.4b5158-1d2329-000103?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, #1d2329 0%, #1d2325 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#1d2329] to-[#1d2325]`
- Contrast (worst point): white 15.85:1 AA · black 1.32:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.1d2329-1d2325?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, #1d2329 0%, #26211c 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#1d2329] to-[#26211c]`
- Contrast (worst point): white 15.82:1 AA · black 1.31:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.1d2329-26211c?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, #1d2329 0%, #2b1e20 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#1d2329] to-[#2b1e20]`
- Contrast (worst point): white 15.80:1 AA · black 1.30:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.1d2329-2b1e20?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 5.18:1 AA, black 1.32:1 */
  --brand-gradient: linear-gradient(135deg in oklab, #1d2329 0%, #0072b2 100%);
  /* hero — worst-case contrast: white 5.18:1 AA, black 1.33:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #202325 0%, #567085 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 13.91:1 AA, black 1.20:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #272d33 0%, #141a1f 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #2e343b 0%, #1b2127 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #1f252b 0%, #0d1318 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.