# PostHog gradient

Gradients derived from PostHog'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/posthog-com
- Brand colors: https://brandsweets.com/colors/brands/posthog-com · Brand page: https://brandsweets.com/b/posthog-com
- Palette: primary #007aff, secondary #2f80fa, accents #f7a501
- Source: https://posthog.com (extracted 2026-09-02)

## Brand gradient

ΔE_OK 0.025 < 0.15 between #007aff and #2f80fa — a 2-stop would read as a flat fill, so this is a tonal ramp of #007aff.

- CSS: `linear-gradient(135deg in oklch shorter hue, #80baff 0%, #007aff 50%, #0040bc 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#80baff] via-[#007aff] to-[#0040bc]`
- Contrast (worst point): white 2.02:1 fail · black 2.46:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.80baff-007aff-0040bc?a=135&in=oklch&hue=shorter

## Hero background

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). L shifted −0.22 until the ink passes AA at the worst point (4.65:1).

- CSS: `linear-gradient(135deg in oklch shorter hue, #63768e 0%, #22416d 50%, #070e35 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#63768e] via-[#22416d] to-[#070e35]`
- Contrast (worst point): white 4.65:1 AA · black 1.12:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.63768e-22416d-070e35?a=135&in=oklch&hue=shorter

## 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. L shifted −0.10 so white ink passes AA on the surface and both states (worst 4.54:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #0066ea 0%, #004cce 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#0066ea] to-[#004cce]`
- Contrast (worst point): white 5.14:1 AA · black 2.92:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.0066ea-004cce?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #0070f4 0%, #0056d8 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #005cdf 0%, #0043c1 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #80baff 0%, #007aff 50%, #0040bc 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#80baff] via-[#007aff] to-[#0040bc]`
- Contrast (worst point): white 2.02:1 fail · black 2.46:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.80baff-007aff-0040bc?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, #007aff 0%, #008eb7 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#007aff] to-[#008eb7]`
- Contrast (worst point): white 3.77:1 AA-large · black 5.21:1 AA · banding high
- Maker: https://brandsweets.com/gradients/new/v1.007aff-008eb7?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, #007aff 0%, #aa7500 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#007aff] to-[#aa7500]`
- Contrast (worst point): white 4.00:1 AA-large · black 4.86:1 AA · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.007aff-aa7500?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, #007aff 0%, #ee0048 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#007aff] to-[#ee0048]`
- Contrast (worst point): white 4.00:1 AA-large · black 4.71:1 AA · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.007aff-ee0048?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 2.02:1, black 2.46:1 */
  --brand-gradient: linear-gradient(135deg in oklch shorter hue, #80baff 0%, #007aff 50%, #0040bc 100%);
  /* hero — worst-case contrast: white 4.65:1 AA, black 1.12:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklch shorter hue, #63768e 0%, #22416d 50%, #070e35 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 5.14:1 AA, black 2.92:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #0066ea 0%, #004cce 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #0070f4 0%, #0056d8 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #005cdf 0%, #0043c1 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.