.feature-pure-black() {
	--color-surface-0: #000;
	--color-surface-1: ~'hsl( var( --color-primary__h ), 20%, 10% )';
	--color-surface-2: ~'hsl( var( --color-primary__h ), 25%, 12% )';
	--color-surface-3: ~'hsl( var( --color-primary__h ), 25%, 15% )';
	--color-surface-4: ~'hsl( var( --color-primary__h ), 15%, 20% )';
	--shadow-strength: 0.04;
}

.citizen-feature-pure-black-clientpref-1 {
	:root.skin-theme-clientpref-night& {
		.feature-pure-black();
	}

	@media ( prefers-color-scheme: dark ) {
		:root.skin-theme-clientpref-os& {
			.feature-pure-black();
		}
	}
}