# NASA gradient

Gradients derived from NASA'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/nasa-gov
- Brand colors: https://brandsweets.com/colors/brands/nasa-gov · Brand page: https://brandsweets.com/b/nasa-gov
- Palette: primary #0b3d91, secondary #fc3d21, accents #f64137
- Source: https://nasa.gov (extracted 2026-09-05)

## Brand gradient

- CSS: `linear-gradient(135deg in oklab, #0b3d91 0%, #fc3d21 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0b3d91] to-[#fc3d21]`
- Contrast (worst point): white 3.60:1 AA-large · black 2.09:1 fail · banding medium
- Maker: https://brandsweets.com/gradients/new/v1.0b3d91-fc3d21?a=135

## Hero background

Chroma ×0.35 so it can carry text; ink white (inkFor at the midpoint). L shifted −0.08 until the ink passes AA at the worst point (4.60:1).

- CSS: `linear-gradient(135deg in oklab, #212c48 0%, #a36559 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#212c48] to-[#a36559]`
- Contrast (worst point): white 4.60:1 AA · black 1.52:1 fail · banding medium · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.212c48-a36559?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 7.40:1).

- CSS: `linear-gradient(180deg in oklch shorter hue, #18499e 0%, #003184 100%)`
- Tailwind: `bg-linear-to-b/oklch from-[#18499e] to-[#003184]`
- Contrast (worst point): white 8.45:1 AA · black 1.77:1 fail · banding high · ink #ffffff
- Maker: https://brandsweets.com/gradients/new/v1.18499e-003184?a=180&in=oklch&hue=shorter
- Hover: `linear-gradient(180deg in oklch shorter hue, #2152a8 0%, #073a8e 100%)`
- Active: `linear-gradient(180deg in oklch shorter hue, #0e4094 0%, #00287b 100%)`

## Tonal ramp

- CSS: `linear-gradient(135deg in oklch shorter hue, #4073cc 0%, #0b3d91 50%, #000059 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#4073cc] via-[#0b3d91] to-[#000059]`
- Contrast (worst point): white 4.62:1 AA · black 1.14:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.4073cc-0b3d91-000059?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, #0b3d91 0%, #0f4a62 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0b3d91] to-[#0f4a62]`
- Contrast (worst point): white 9.62:1 AA · black 2.08:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.0b3d91-0f4a62?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, #0b3d91 0%, #583f0d 100%)`
- Tailwind: `bg-linear-to-br/oklch from-[#0b3d91] to-[#583f0d]`
- Contrast (worst point): white 9.81:1 AA · black 2.01:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.0b3d91-583f0d?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, #0b3d91 0%, #7e1221 100%)`
- Tailwind: `bg-linear-to-br/oklab from-[#0b3d91] to-[#7e1221]`
- Contrast (worst point): white 9.98:1 AA · black 1.99:1 fail · banding high
- Maker: https://brandsweets.com/gradients/new/v1.0b3d91-7e1221?a=135

## CSS custom properties (brand.css)

```css
:root {
  /* Brand gradient (derived) */
  /* worst-case contrast: white 3.60:1 AA-large, black 2.09:1 */
  --brand-gradient: linear-gradient(135deg in oklab, #0b3d91 0%, #fc3d21 100%);
  /* hero — worst-case contrast: white 4.60:1 AA, black 1.52:1; ink passes AA at the worst point */
  --brand-gradient-hero: linear-gradient(135deg in oklab, #212c48 0%, #a36559 100%);
  --brand-gradient-hero-ink: #ffffff;
  /* button — worst-case contrast: white 8.45:1 AA, black 1.77:1 */
  --brand-gradient-button: linear-gradient(180deg in oklch shorter hue, #18499e 0%, #003184 100%);
  --brand-gradient-button-hover: linear-gradient(180deg in oklch shorter hue, #2152a8 0%, #073a8e 100%);
  --brand-gradient-button-active: linear-gradient(180deg in oklch shorter hue, #0e4094 0%, #00287b 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.