#C85118

CSS

:root {
  --titian-red: #c85118;
  --titian-red-rgb: 200 81 24;
  --titian-red-oklch: oklch(0.584 0.165 41.9);
}

.element {
  color: var(--titian-red);
  background-color: hsl(19 79% 44%);
  border-color: oklch(0.584 0.165 41.9);
}

Tailwind CSS v4

@theme {
  --color-titian-red: #c85118;
  --color-titian-red-50: #ffe7cf;
  --color-titian-red-100: #ffd7bc;
  --color-titian-red-200: #ffbe9a;
  --color-titian-red-300: #fd9a6f;
  --color-titian-red-400: #ed7949;
  --color-titian-red-500: #db5610;
  --color-titian-red-600: #b94a13;
  --color-titian-red-700: #953b10;
  --color-titian-red-800: #6f290d;
  --color-titian-red-900: #4f1c08;
  --color-titian-red-950: #340b00;
}

SCSS

$titian-red: #c85118;
$titian-red-rgb: 200, 81, 24;
$titian-red-light: mix(#fff, $titian-red, 20%);
$titian-red-dark: mix(#000, $titian-red, 20%);

.element {
  color: $titian-red;
  box-shadow: 0 0 0 2px rgba($titian-red, 0.35);
}