:root{
	--dark-theme-check: 1;
	--theme-color-check: 1;
	--accent-color-check: 1;
	--theme-hue: 90;
	--accent-offset: 60;
	--accent-hue: calc(var(--theme-hue) + var(--accent-offset));
	
	/* Contrast hue - the color for hyperlinks and selection.
	Default hue is 210, but we want it the +180 opposite hue of theme if there is a theme color.*/
	--theme-contrast-hue: calc(calc(var(--theme-hue) + 180) * var(--theme-color-check));
	--default-contrast-hue: calc(210 - calc(var(--theme-color-check) * 210));
	--contrast-hue: calc(var(--theme-contrast-hue) + var(--default-contrast-hue));

	--foreground-lightness: calc(10% + calc(var(--dark-theme-check) * 70%));
	--background-lightness: calc(80% - calc(var(--dark-theme-check) * 70%));
	--contrast-lightness: calc(30% + calc(var(--dark-theme-check) * 55%));
	--foreground-theme-color: hsl(
		var(--theme-hue),
		calc(var(--theme-color-check) * 100%),
		var(--foreground-lightness)
		);
	--background-theme-color: hsl(
		var(--theme-hue),
		calc(var(--theme-color-check) * 25%),
		var(--background-lightness)
		);
	--foreground-accent-color: hsl(
		var(--accent-hue),
		calc(var(--accent-color-check) * 100%),
		var(--foreground-lightness)
		);
	--background-accent-color: hsl(
		var(--accent-hue),
		calc(var(--accent-color-check) * 100%),
		var(--background-lightness)
		);
	--contrast-color: hsl(var(--contrast-hue), 100%, var(--contrast-lightness));				
}

::selection {
	background-color: var(--contrast-color);
	color: hsl(0, 0%, var(--background-lightness));
}

body {
	color: var(--foreground-accent-color);
	background-color: var(--background-theme-color);
}

p {
	color: var(--foreground-theme-color);
	text-indent: 4em;
}

hr {
	border-color: var(--foreground-accent-color);
}

nav {
	color: var(--foreground-accent-color);
	text-align: center;
}

a {
	color: var(--contrast-color);
}

a:visited {
	color: hsl(calc(var(--contrast-hue) + 60), 100%, var(--contrast-lightness))
}

a:hover {
	color: hsl(calc(var(--contrast-hue) - 150), 100%, var(--contrast-lightness))
}