/**
 * Dark theme mixin
 * Dark theme needs a mixin because it is being used by the auto theme as well
 */
.theme-dark() {
	--color-primary__l: 60%;

	--color-surface-0__s: 20%;
	--color-surface-0__l: 6%;

	--color-surface-1__s: 25%;
	--color-surface-1__l: 8%;

	--color-surface-2__s: 25%;
	--color-surface-2__l: 11%;

	--color-surface-3__s: 28%;
	--color-surface-3__l: 16%;

	--color-surface-4__s: 31%;
	--color-surface-4__l: 21%;

	--color-destructive__l: 50%;
	--color-success__l: 35%;
	--color-warning__l: 60%;
	--background-color-subtle__s: 85%;
	--background-color-subtle__l: 10%;

	--color-emphasized: ~'hsl( var( --color-primary__h ), 80%, 95% )';
	--color-base: ~'hsl( var( --color-primary__h ), 45%, 80% )';
	--color-subtle: ~'hsl( var( --color-primary__h ), 35%, 65% )';

	--color-syntax-red: @color-syntax-red-dark;
	--color-syntax-orange: @color-syntax-orange-dark;
	--color-syntax-yellow: @color-syntax-yellow-dark;
	--color-syntax-green: @color-syntax-green-dark;
	--color-syntax-cyan: @color-syntax-cyan-dark;
	--color-syntax-blue: @color-syntax-blue-dark;
	--color-syntax-paleblue: @color-syntax-paleblue-dark;
	--color-syntax-purple: @color-syntax-purple-dark;
	--color-syntax-brown: @color-syntax-brown-dark;
	--color-syntax-pink: @color-syntax-pink-dark;
	--color-syntax-violet: @color-syntax-violet-dark;

	--background-color-button-quiet--hover: rgba( 255, 255, 255, 0.04 );
	--background-color-button-quiet--active: rgba( 255, 255, 255, 0.08 );
	--background-color-icon: ~'rgba( 255, 255, 255, var( --opacity-icon-base ) )';
	--background-color-icon--hover: ~'rgba( 255, 255, 255, var( --opacity-icon-base--hover ) )';
	--background-color-icon--active: ~'rgba( 255, 255, 255, var( --opacity-icon-base--active ) )';

	--border-color-base: rgba( 255, 255, 255, 0.05 );
	--border-color-subtle: rgba( 255, 255, 255, 0.02 );
	--border-color-interactive: rgba( 255, 255, 255, 0.08 );

	--shadow-color: var( --color-primary__h ), 50%, 3%;
	--shadow-opacity: 0.3;

	--filter-invert: invert( 1 ) hue-rotate( 180deg );

	--font-grade: -25;

	// FIXME: Browsers seem to treat GRAD differently, disabling for now
	// Dark theme usually have an illusion of thicker fonts
	// So we have to tune it back
	// font-variation-settings: 'GRAD' -90;

	color-scheme: dark;
}

.feature-pure-black() {
	--color-surface-0__l: 0%;
	--color-surface-1__s: 20%;
	--color-surface-1__l: 3%;
	--color-surface-2__l: 5%;
	--color-surface-3__l: 8%;
	--color-surface-4__l: 12%;
	--color-emphasized: ~'hsl( var( --color-primary__h ), 0%, 95% )';
	--color-base: ~'hsl( var( --color-primary__h ), 0%, 85% )';
	--color-subtle: ~'hsl( var( --color-primary__h ), 0%, 65% )';
	--border-color-base: rgba( 255, 255, 255, 0.07 );
	--border-color-subtle: rgba( 255, 255, 255, 0.04 );
	--border-color-interactive: rgba( 255, 255, 255, 0.1 );
	--shadow-opacity: 0.2;
}

// T365102 invert class specifically for image related element
.skin-invert-image img,
.skin-invert {
	filter: var( --filter-invert );
}

.skin-theme-clientpref-night {
	:root& {
		.theme-dark();
	}
}

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

.citizen-feature-custom-font-size-clientpref-small {
	:root& {
		--font-size-base: 0.875rem;
	}
}

.citizen-feature-custom-font-size-clientpref-large {
	:root& {
		--font-size-base: 1.125rem;
	}
}

.citizen-feature-custom-width-clientpref-standard {
	:root& {
		--width-layout: 1080px;
	}
}

.citizen-feature-custom-width-clientpref-wide {
	:root& {
		--width-layout: 1600px;
	}
}

.citizen-feature-custom-width-clientpref-full {
	:root& {
		--width-layout: 100vw;
	}
}

.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();
		}
	}
}

.citizen-feature-autohide-navigation-clientpref-1 {
	@media ( max-width: @max-width-breakpoint-tablet ) {
		.citizen-header {
			transition-timing-function: var( --transition-timing-function-ease-out );
			transition-duration: var( --transition-duration-medium );
			transition-property: transform;
		}

		// Hide sticky header on scroll down on smaller screens
		.citizen-sticky-header-visible {
			.citizen-page-header,
			.citizen-page-heading {
				transition-timing-function: var( --transition-timing-function-ease-out );
				transition-duration: var( --transition-duration-medium );
			}

			.citizen-page-header {
				transition-property: transform;
			}

			.citizen-page-heading {
				transition-property: opacity;
			}
		}

		.citizen-scroll--down {
			--height-sticky-header: 0 !important;

			.citizen-header {
				transition-timing-function: var( --transition-timing-function-ease-in );
				transition-duration: var( --transition-duration-base );
				transform: translateY( 100% );
			}

			.citizen-toc {
				bottom: var( --space-xs );
			}

			.page-actions {
				box-shadow: none;
				opacity: 0;
				transform: translateY( 250% );
			}

			&.citizen-sticky-header-visible {
				.citizen-page-header,
				.citizen-page-heading {
					transition-timing-function: var( --transition-timing-function-ease-in );
					transition-duration: var( --transition-duration-base );
				}

				.citizen-page-header {
					transform: translateY( -150% );
				}

				.citizen-page-heading {
					opacity: 0;
				}
			}
		}

		.citizen-scroll--up {
			// Page actions needed to have a scroll up handler to avoid clipping issue
			.page-actions {
				opacity: 1;
				// Start transition after sticky header has finished transition
				transition: opacity var( --transition-duration-medium ) var( --transition-timing-function-ease-out ) var( --transition-duration-medium ), transform var( --transition-duration-medium ) var( --transition-timing-function-ease-out ) var( --transition-duration-medium );
			}
		}
	}
}