Color functions in Sciter's CSS, a la LeSS

Base color
Base color - hsv(angle,80%,80%)
lighten:20%
darken:20%
saturate:20%
desaturate:20%
rotate:-120deg
rotate:+120deg
mix(50%)
opacity:50%
opacity:75%
grayscale:50%
grayscale:100%
sepia:100%