#AD5981

CSS

:root {
  --our-little-secret: #ad5981;
  --our-little-secret-rgb: 173 89 129;
  --our-little-secret-oklch: oklch(0.576 0.119 351.6);
}

.element {
  color: var(--our-little-secret);
  background-color: hsl(331 34% 51%);
  border-color: oklch(0.576 0.119 351.6);
}

Tailwind CSS v4

@theme {
  --color-our-little-secret: #ad5981;
  --color-our-little-secret-50: #ffe8f8;
  --color-our-little-secret-100: #ffd8eb;
  --color-our-little-secret-200: #fec0d8;
  --color-our-little-secret-300: #e89ebc;
  --color-our-little-secret-400: #d480a6;
  --color-our-little-secret-500: #c0628f;
  --color-our-little-secret-600: #a25379;
  --color-our-little-secret-700: #824261;
  --color-our-little-secret-800: #603048;
  --color-our-little-secret-900: #442032;
  --color-our-little-secret-950: #2b101e;
}

SCSS

$our-little-secret: #ad5981;
$our-little-secret-rgb: 173, 89, 129;
$our-little-secret-light: mix(#fff, $our-little-secret, 20%);
$our-little-secret-dark: mix(#000, $our-little-secret, 20%);

.element {
  color: $our-little-secret;
  box-shadow: 0 0 0 2px rgba($our-little-secret, 0.35);
}