# Semrush gradient

Gradients derived from Semrush'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/semrush-com
- Brand colors: https://brandsweets.com/colors/brands/semrush-com · Brand page: https://brandsweets.com/b/semrush-com
- Palette: primary #c494fc, secondary #8467aa, accents #ba4717
- Source: https://semrush.com (extracted 2026-09-02)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #c494fc 0%, #8467aa 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#c494fc] to-[#8467aa]`
- Contrast (worst point): white 2.34:1 fail · black 4.50:1 AA · banding high
- Maker: https://brandsweets.com/gradients/new/v1.c494fc-8467aa?a=135

## Hero background

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). L shifted −0.19 until the ink passes AA at the worst point (4.66:1).

- CSS: `linear-gradient(135deg in oklab, #7d6e91 0%, #423951 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#7d6e91] to-[#423951]`
- Contrast (worst point): white 4.66:1 AA · black 1.94:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.7d6e91-423951?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. Black ink passes AA on the surface and both states (worst 6.90:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #d1a1ff 0%, #b787ee 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#d1a1ff] to-[#b787ee]`
- Contrast (worst point): white 2.05:1 fail · black 7.71:1 AA · banding high · ink #000000
- Maker: https://brandsweets.com/gradients/new/v1.d1a1ff-b787ee?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #d8adff 0%, #c191f9 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #c797ff 0%, #ae7ee4 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #f2deff 0%, #c494fc 50%, #8c5dbf 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#f2deff] via-[#c494fc] to-[#8c5dbf]`
- Contrast (worst point): white 1.26:1 fail · black 4.43:1 AA-large · banding high
- Maker: https://brandsweets.com/gradients/new/v1.f2deff-c494fc-8c5dbf?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, #c494fc 0%, #97a8fc 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#c494fc] to-[#97a8fc]`
- Contrast (worst point): white 2.25:1 fail · black 8.96:1 AA · banding high
- Maker: https://brandsweets.com/gradients/new/v1.c494fc-97a8fc?a=135

## Complementary

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, #c494fc 0%, #97c01d 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#c494fc] to-[#97c01d]`
- Contrast (worst point): white 2.13:1 fail · black 8.56:1 AA · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.c494fc-97c01d?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, #c494fc 0%, #f4951c 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#c494fc] to-[#f4951c]`
- Contrast (worst point): white 2.28:1 fail · black 8.98:1 AA · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.c494fc-f4951c?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 2.34:1, black 4.50:1 AA */
  --brand-gradient: linear-gradient(135deg in oklab, #c494fc 0%, #8467aa 100%);
  /* hero — worst-case contrast: white 4.66:1 AA, black 1.94:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #7d6e91 0%, #423951 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 2.05:1, black 7.71:1 AA */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #d1a1ff 0%, #b787ee 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #d8adff 0%, #c191f9 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #c797ff 0%, #ae7ee4 100%);
  --brand-gradient-button-ink: #000000;
}
```

## 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.