# Railway gradient

Gradients derived from Railway'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/railway-app
- Brand colors: https://brandsweets.com/colors/brands/railway-app · Brand page: https://brandsweets.com/b/railway-app
- Palette: primary #13044c, secondary #f9a8d4, accents #c67839
- Source: https://railway.app (extracted 2026-09-02)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #13044c 0%, #f9a8d4 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#13044c] to-[#f9a8d4]`
- Contrast (worst point): white 1.81:1 fail · black 1.15:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.13044c-f9a8d4?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 (4.55:1).

- CSS: `linear-gradient(135deg in oklab, #010003 0%, #8b6e7c 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#010003] to-[#8b6e7c]`
- Contrast (worst point): white 4.55:1 AA · black 1.00:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.010003-8b6e7c?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 15.10:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #1a1258 0%, #0d0040 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#1a1258] to-[#0d0040]`
- Contrast (worst point): white 16.52:1 AA · black 1.09:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.1a1258-0d0040?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #201b61 0%, #110149 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #15074f 0%, #080033 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #393a82 0%, #13044c 50%, #010008 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#393a82] via-[#13044c] to-[#010008]`
- Contrast (worst point): white 9.99:1 AA · black 1.00:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.393a82-13044c-010008?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, #13044c 0%, #021930 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#13044c] to-[#021930]`
- Contrast (worst point): white 17.69:1 AA · black 1.15:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.13044c-021930?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, #13044c 0%, #1d1802 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#13044c] to-[#1d1802]`
- Contrast (worst point): white 17.70:1 AA · black 1.15:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.13044c-1d1802?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, #13044c 0%, #2f0b01 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#13044c] to-[#2f0b01]`
- Contrast (worst point): white 17.86:1 AA · black 1.15:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.13044c-2f0b01?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 1.81:1, black 1.15:1 */
  --brand-gradient: linear-gradient(135deg in oklab, #13044c 0%, #f9a8d4 100%);
  /* hero — worst-case contrast: white 4.55:1 AA, black 1.00:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #010003 0%, #8b6e7c 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 16.52:1 AA, black 1.09:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #1a1258 0%, #0d0040 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #201b61 0%, #110149 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #15074f 0%, #080033 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.