:root{
    --horizontal-plane-col-0:11.7rem;
    --horizontal-plane-col-1:3.9rem;
    --horizontal-plane-col-2:-3.9rem;
    --horizontal-plane-col-3:-11.7rem;
    --horizontal-plane-reverse-col-2:4.3rem;
    --horizontal-plane-reverse-col-3:-11.7rem;

    --cell-size:3.8rem;
    --grid-width:calc((3.8rem * 5) + (0.1rem * 4));
    --col-count:4;
    --row-count:5;
    --grid-top:1.9rem;
    --draw-south-length:3rem;
    --draw-direction-south-west-top:1.9rem;
    --draw-direction-south-west-left:3.2rem;
    --draw-direction-north-east-left:3.5rem;
    --draw-direction-north-west-left:3.5rem;
}