# Fly.io gradient

Gradients derived from Fly.io'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/fly-io
- Brand colors: https://brandsweets.com/colors/brands/fly-io · Brand page: https://brandsweets.com/b/fly-io
- Palette: primary #7c3aed, secondary #7c3aed
- Source: https://fly.io (extracted 2026-09-02)

## Brand gradient

ΔE_OK 0.000 < 0.15 between #7c3aed and #7c3aed — a 2-stop would read as a flat fill, so this is a tonal ramp of #7c3aed.

- CSS: `linear-gradient(135deg in oklch shorter hue, #ab8aff 0%, #7c3aed 50%, #4b00a4 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#ab8aff] via-[#7c3aed] to-[#4b00a4]`
- Contrast (worst point): white 2.69:1 fail · black 1.83:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.ab8aff-7c3aed-4b00a4?a=135&in=oklch&hue=shorter

## Hero background

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). L shifted −0.15 until the ink passes AA at the worst point (4.65:1).

- CSS: `linear-gradient(135deg in oklch shorter hue, #786f97 0%, #443870 50%, #200c38 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#786f97] via-[#443870] to-[#200c38]`
- Contrast (worst point): white 4.65:1 AA · black 1.17:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.786f97-443870-200c38?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 −0.02 so white ink passes AA on the surface and both states (worst 4.58:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #8242f4 0%, #6c1fd8 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#8242f4] to-[#6c1fd8]`
- Contrast (worst point): white 5.21:1 AA · black 2.83:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.8242f4-6c1fd8?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #8a4dff 0%, #742de2 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #7936e9 0%, #6408cd 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #ab8aff 0%, #7c3aed 50%, #4b00a4 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#ab8aff] via-[#7c3aed] to-[#4b00a4]`
- Contrast (worst point): white 2.69:1 fail · black 1.83:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.ab8aff-7c3aed-4b00a4?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, #7c3aed 0%, #2160ed 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#7c3aed] to-[#2160ed]`
- Contrast (worst point): white 5.29:1 AA · black 3.67:1 AA-large · banding high
- Maker: https://brandsweets.com/gradients/new/v1.7c3aed-2160ed?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, #7c3aed 0%, #707521 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#7c3aed] to-[#707521]`
- Contrast (worst point): white 4.92:1 AA · black 3.66:1 AA-large · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.7c3aed-707521?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, #7c3aed 0%, #a45820 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#7c3aed] to-[#a45820]`
- Contrast (worst point): white 5.22:1 AA · black 3.68:1 AA-large · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.7c3aed-a45820?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 2.69:1, black 1.83:1 */
  --brand-gradient: linear-gradient(135deg in oklch shorter hue, #ab8aff 0%, #7c3aed 50%, #4b00a4 100%);
  /* hero — worst-case contrast: white 4.65:1 AA, black 1.17:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklch shorter hue, #786f97 0%, #443870 50%, #200c38 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 5.21:1 AA, black 2.83:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #8242f4 0%, #6c1fd8 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #8a4dff 0%, #742de2 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #7936e9 0%, #6408cd 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.