/**
 * Engine-side color mixing.
 *
 * Lynx's CSS engine has no `color-mix()` and can't alpha-compose `var()`
 * colors — but theme palettes are plain JS data, so tints can be computed
 * where the palette lives instead of in CSS. `registerTheme()` uses this to
 * materialize the `*-soft` tokens (see `./registry.ts`).
 *
 * Accepted inputs are the same "engine-safe" color strings themes already
 * use: `#rgb`, `#rrggbb`, `#rrggbbaa`, `rgb(r, g, b)`, `rgba(r, g, b, a)`.
 * Anything else (named colors, `oklch()`, `var()`) is not parseable here —
 * `mixColors` then falls back to the base color unchanged, which degrades to
 * a neutral surface rather than a wrong tint.
 */
/**
 * Mix `ratio` of `color` into `base` (linear sRGB per-channel, like
 * `color-mix(in srgb, color ratio, base)`), returning a hex string. If either
 * input can't be parsed, returns `base` unchanged.
 */
export declare function mixColors(color: string, base: string, ratio: number): string;
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