mediawiki-skins-Citizen/resources/skins.citizen.styles/Header.less

.citizen-header {
	--header-icon-size: ~'calc( var( --header-button-size ) / 2 )';
	--header-button-size: ~'calc( var( --header-size ) - var(  --space-xs ) * 2 )';
	--header-direction: row;
	position: fixed;
	z-index: @z-index-site-header;
	right: 0;
	bottom: 0;
	left: 0;
	display: flex;
	flex-direction: var( --header-direction );
	padding: var( --space-xs );
	border-top: 1px solid var( --border-color-base );
	background-color: var( --color-surface-0 );
	gap: var( --space-xxs );

	&__item {
		display: flex;
		align-items: center;
	}

	&__button {
		display: grid;
		width: var( --header-button-size );
		height: var( --header-button-size );
		border-radius: var( --border-radius--small );
		place-items: center;

		// Used in checkbox hack
		&Checkbox {
			position: absolute;
			display: block;
			width: inherit;
			height: inherit;
		}

		// Pure CSS icons
		&Icon {
			overflow: hidden; // Sometimes CSS animation can clip
			width: var( --header-icon-size );
			height: var( --header-icon-size );
		}

		&Icon,
		.citizen-ui-icon:before {
			opacity: var( --opacity-icon-base );
			transition: @transition-transform, @transition-opacity;
		}

		&:hover {
			background-color: var( --background-color-quiet--hover );

			.citizen-ui-icon:before,
			.citizen-header__buttonIcon {
				opacity: var( --opacity-icon-base--hover );
			}
		}

		&:active {
			background-color: var( --background-color-quiet--active );

			.citizen-ui-icon:before,
			.citizen-header__buttonIcon {
				opacity: var( --opacity-icon-base--active );
			}
		}
	}

	&__inner {
		z-index: -1; // Inner element should be behind menu and search
		display: flex;
		min-width: 0;
		flex-direction: var( --header-direction );
		flex-grow: 1;
		justify-content: space-between;
		gap: var( --space-xxs );

		.mw-checkbox-hack-checkbox:checked {
			~ .citizen-header__button {
				background-color: var( --background-color-primary--active );
			}
		}
	}

	&__start,
	&__end {
		display: flex;
		flex-direction: var( --header-direction );
		gap: var( --space-xxs );
	}

	&__start {
		min-width: 0;
		align-items: center;
	}

	// Reset
	ul {
		margin: 0;
		list-style: none;
	}
}

.skin-citizen-dark {
	.citizen-header__button {
		&Icon {
			filter: invert( 1 );
		}
	}
}

// Notifications
#p-notifications {
	ul {
		display: flex;
		flex-direction: var( --header-direction );
		align-items: center;
		gap: var( --space-xxs );
	}
}

// Reset hover styles if it is a touch device
// This is dumb but hover:hover overrides active states
@media ( hover: none ) {
	.citizen-header {
		&__button {
			&:hover {
				background-color: none;

				.citizen-header__buttonIcon {
					opacity: var( --opacity-icon-base );
				}
			}
		}
	}
}

@media ( min-width: @width-breakpoint-desktop ) {
	.citizen-header {
		--header-direction: column;
		top: 0;
		right: unset;
		left: 0;
		border-top: 0;
		border-right: 1px solid var( --border-color-base );
	}
}

/* Hide header when scroll down on smaller screen sizes */
@media ( max-width: @width-breakpoint-tablet ) {
	.citizen-header {
		transition: @transition-transform;
	}

	.citizen-scroll--down .citizen-header {
		transform: translateY( 100% );
	}
}