server/core/css/header.scss

/**
 * @copyright Copyright (c) 2016, John Molakvoæ <skjnldsv@protonmail.com>
 * @copyright Copyright (c) 2016, Julius Haertl <jus@bitgrid.net>
 * @copyright Copyright (c) 2016, Lukas Reschke <lukas@statuscode.ch>
 * @copyright Copyright (c) 2016, Jos Poortvliet <jos@opensuse.org>
 * @copyright Copyright (c) 2016, Erik Pellikka <erik@pellikka.org>
 * @copyright Copyright (c) 2016, jowi <sjw@gmx.ch>
 * @copyright Copyright (c) 2015, Hendrik Leppelsack <hendrik@leppelsack.de>
 * @copyright Copyright (c) 2015, Volker E <volker.e@temporaer.net>
 * @copyright Copyright (c) 2014-2017, Jan-Christoph Borchardt <hey@jancborchardt.net>
 *
 * @license GNU AGPL version 3 or any later version
 *
 */

/* prevent ugly selection effect on accidental selection */
#header,
#navigation,
#expanddiv {
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
}

/* removed until content-focusing issue is fixed */
#skip-to-content a {
	position: absolute;
	left: -10000px;
	top: auto;
	width: 1px;
	height: 1px;
	overflow: hidden;
	&:focus {
		left: 76px;
		top: -9px;
		color: var(--color-primary-text);
		width: auto;
		height: auto;
	}
}

/* HEADERS ------------------------------------------------------------------ */
#body-user #header,
#body-settings #header,
#body-public #header {
	display: inline-flex;
	position: fixed;
	top: 0;
	width: 100%;
	z-index: 2000;
	height: $header-height;
	background-color: var(--color-primary);
	box-sizing: border-box;
	justify-content: space-between;
}

/* LOGO and APP NAME -------------------------------------------------------- */
#nextcloud {
	padding: 7px 0;
	padding-left: 86px; // logo width + 2* pa
	position: relative;
	height: 100%;
	box-sizing: border-box;
	opacity: 1;
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	&:focus {
		opacity: .75;
	}
	&:hover, &:active {
		opacity: 1;
	}
}

#header {
	/* Header menu */
	.header-left > nav > .menu,
	.header-right > div > .menu {
		background-color: var(--color-main-background);
		filter: drop-shadow(0 1px 5px var(--color-box-shadow));
		border-radius: 0 0 3px 3px;
		box-sizing: border-box;
		z-index: 2000;
		position: absolute;
		max-width: 350px;
		max-height: 280px;
		right: 5px;
		top: $header-height;
		margin: 0;

		&:not(.popovermenu) {
			display: none;
		}

		/* Dropdown arrow */
		&:after {
			border: 10px solid transparent;
			border-bottom-color: var(--color-main-background);
			bottom: 100%;
			content: ' ';
			height: 0;
			width: 0;
			position: absolute;
			pointer-events: none;
			right: 10px;
		}
	}
	.logo {
		display: inline-flex;
		background-image: var(--image-logo);
		background-repeat: no-repeat;
		background-size: contain;
		background-position: center;
		width: 62px;
		position: absolute;
		left: 12px;
		top: 1px;
		bottom: 1px;

		img {
			opacity: 0;
			max-width: 100%;
			max-height: 200px;
		}
	}

	.header-appname-container {
		display: none;
		padding-right: 10px;
		flex-shrink: 0;
	}
	/* show caret indicator next to logo to make clear it is tappable */
	.icon-caret {
		display: inline-block;
		width: 12px;
		height: 12px;
		margin: 0;
		margin-top: -21px;
		padding: 0;
		vertical-align: middle;
	}

	#header-left, .header-left,
	#header-right, .header-right {
		display: inline-flex;
		align-items: center;
	}

	#header-left, .header-left {
		flex: 0 0;
		flex-grow: 1;
		white-space: nowrap;
	}

	#header-right, .header-right {
		justify-content: flex-end;
		flex-shrink: 1;
	}

	/* Right header standard */
	.header-right {
		> div,
		> form {
			height: 100%;
			position: relative;
			> .menutoggle {
				display: flex;
				justify-content: center;
				align-items: center;
				width: $header-height;
				height: 100%;
				cursor: pointer;
				opacity: 0.6;
				padding: 0;
				margin: 0;
			}
		}
	}
}

/* hover effect for app switcher label */

.header-appname-container .header-appname {
	opacity: .75;
}

.menutoggle {
	.icon-caret {
		opacity: .75;
	}
	&:hover {
		.header-appname, .icon-caret {
			opacity: 1;
		}
	}
	&:focus {
		.header-appname, .icon-caret {
			opacity: 1;
		}
	}
	&.active {
		.header-appname, .icon-caret {
			opacity: 1;
		}
	}
}

/* show appname next to logo */
.header-appname {
	color: var(--color-primary-text);
	font-size: 16px;
	font-weight: 300;
	margin: 0;
	padding: 0;
	padding-right: 5px;
}

/* do not show menu toggle on public share links as there is no menu */
#body-public #header .icon-caret {
	display: none;
}

/* NAVIGATION --------------------------------------------------------------- */
nav[role='navigation'] {
	display: inline-block;
	width: $header-height;
	height: $header-height;
	margin-left: -$header-height;
	position: relative;
}

#header .header-left > nav > #navigation {
	position: relative;
	left: 25px; /* half the togglemenu */
	transform: translateX(-50%);
	width: 160px;
}

#header .header-left > nav > #navigation,
.ui-datepicker,
.ui-timepicker.ui-widget {
	background-color: var(--color-main-background);
	filter: drop-shadow(0 1px 10px var(--color-box-shadow));
	&:after {
		/* position of dropdown arrow */
		left: 50%;
		bottom: 100%;
		border: solid transparent;
		content: ' ';
		height: 0;
		width: 0;
		position: absolute;
		pointer-events: none;
		border-color: rgba(0, 0, 0, 0);
		border-bottom-color: var(--color-main-background);
		border-width: 10px;
		margin-left: -10px; /* border width */
	}
}

#navigation {
	box-sizing: border-box;
	* {
		box-sizing: border-box;
	}
	li {
		display: inline-block;
	}
	a {
		position: relative;
		display: inline-flex;
		padding: 10px 12px;
		height: 40px;
		align-items: center;
		span {
			display: inline-block;
			padding-bottom: 0;
			padding-left: 10px;
			color: var(--color-main-text);
			white-space: nowrap;
			overflow: hidden;
			text-overflow: ellipsis;
			max-width: 110px;
		}
		svg,
		span {
			opacity: .7;
		}
		&:hover svg,
		&:focus svg,
		&:hover span,
		&:focus span {
			opacity: 1;
		}
		&.active {
			svg, span {
				opacity: 1;
			}
		}
	}
	.app-icon {
		margin: 0 auto;
		padding: 0;
		max-height: 32px;
		max-width: 32px;
	}

	/* loading feedback for apps */
	.app-loading {
		.icon-loading-small {
			display: inline !important;
			position: absolute;
			left: 12px;
			width: 16px;
			height: 16px;
		}
		.app-icon {
			opacity: 0;
		}
	}

}

/* Apps management */
#apps {
	max-height: inherit;
	overflow: auto;
	.in-header {
		display: none;
	}
	ul {
		display: flex;
		flex-direction: column;
	}
}

/* USER MENU -----------------------------------------------------------------*/
#settings {
	display: inline-block;
	height: 100%;
	cursor: pointer;
	flex: 0 0 auto;

	/* User menu on the right */
	#expand {
		opacity: 1; /* override icon opacity */
		padding-right: 12px;

		&:hover,
		&:focus,
		&:active {
			color: var(--color-primary-text);

			img, #expandDisplayName {
				opacity: .57 !important;
			}
		}

		/* Profile picture in header */
		.avatardiv {
			cursor: pointer;
			height: 32px;
			width: 32px;

			img {
				opacity: 1;
				cursor: pointer;
			}
			/* do not show display name when profile picture is present */
			&.avatardiv-shown + #expandDisplayName {
				display: none;
			}
		}

		#expandDisplayName {
			padding: 8px;
			opacity: .6;

			/* full opacity for gear icon if active */
			#body-settings & {
				opacity: 1;
			}
		}

		/* show triangle below user menu if active */
		#body-settings &:before {
			content: ' ';
			height: 0;
			width: 0;
			position: absolute;
			pointer-events: none;
			border: 0 solid transparent;
			border-bottom-color: var(--color-main-background);
			border-width: 10px;
			bottom: 0;
			z-index: 100;
			display: block;
		}
	}

	#expanddiv:after {
		right: 22px;
	}
}

/* Settings menu */
#expanddiv {
	a {
		display: inline-flex;
		align-items: center;
		height: 40px;
		color: var(--color-main-text);
		padding: 12px;
		box-sizing: border-box;
		opacity: .7;
		white-space: nowrap;

		.icon-loading-small {
			margin-right: 9px;
			background-size: 16px 16px;
		}
		img {
			margin-right: 9px;
			height: 16px;
			width: 16px;
		}
		&:hover,
		&:focus,
		&:active,
		&.active {
			opacity: 1;
			box-shadow: inset 4px 0 var(--color-primary);
		}
	}
}

/* Apps menu */
#appmenu {
	display: inline-flex;
	min-width: $header-height;
	z-index: 2;

	li {
		position: relative;
		cursor: pointer;

		a {
			position: relative;
			display: flex;
			margin: 0;
			height: $header-height;
			width: $header-height;
			align-items: center;
			justify-content: center;
			opacity: .6;
		}
	}

	.app-loading {
		> svg {
			display: none;
		}
		.icon-loading-small-dark {
			width: 20px;
			height: 20px;
			display: block !important;
		}
	}

	/* focused app visual feedback */
	li:hover a,
	li a:focus,
	li a.active {
		opacity: 1;
	}

	li:hover a,
	li a:focus {
		+ span {
			display: inline-block;
		}
	}

	li:hover span,
	li:focus span,
	li a:focus span {
		display: inline-block;
	}

	/* hidden apps menu */
	li img,
	.icon-more-white {
		display: inline-block;
		width: 20px;
		height: 20px;
	}

	/* app title popup */
	li span {
		display: none;
		position: absolute;
		overflow: visible;
		background-color: var(--color-main-background);
		white-space: nowrap;
		border: none;
		border-radius: var(--border-radius);
		border-top-left-radius: 0;
		border-top-right-radius: 0;
		color: var(--color-text-lighter);
		width: auto;
		left: 50%;
		top: 100%;
		transform: translateX(-50%);
		padding: 4px 10px;
		filter: drop-shadow(0 1px 10px var(--color-box-shadow));
		z-index: 100;
	}

	/* show triangle below active app */
	li a::before {
		content: ' ';
		height: 0;
		width: 0;
		position: absolute;
		pointer-events: none;
		border: 0 solid transparent;
		border-bottom-color: var(--color-main-background);
		border-width: 10px;
		transform: translateX(-50%);
		left: 50%;
		bottom: 0;
		display: none;
	}
	/* triangle focus feedback */
	li a.active::before,
	li:hover a::before,
	li:hover a.active::before,
	li a:focus::before {
		display: block;
	}
	li a.active::before {
		z-index: 99;
	}
	li:hover a::before,
	li:hover a::before,
	li a.active:hover::before,
	li a:focus::before {
		z-index: 101;
	}
	&.menu-open li:hover a::before,
	&.menu-open li a.active::before,
	&.menu-open li:hover span {
		display: none !important;
	}

	li.hidden {
		display: none;
	}

	#more-apps {
		z-index: 3;
	}
}

/* Skip navigation links – show only on keyboard focus */
.skip-navigation {
	padding: 11px;
	position: absolute;
	overflow: hidden;
	z-index: 9999;
	top: -999px;
	left: 3px;
	/* Force primary color, otherwise too light focused color */
	background: var(--color-primary) !important;

	&.skip-content {
		left: $navigation-width;
		margin-left: 3px;
	}

	&:focus,
	&:active {
		top: $header-height;
	}
}

/* SEARCHBOX --------------------------------------------------------------- */
.searchbox {
	position: relative;
	display: flex;
	align-items: center;
	input[type='search'] {
		position: relative;
		font-size: 1.2em;
		padding: 3px;
		padding-left: 25px;
		padding-right: 20px;
		background-color: transparent;
		color: var(--color-primary-text);
		border: 0;
		border-radius: var(--border-radius);
		height: 34px;
		width: 0;
		cursor: pointer;
		-webkit-transition: all 100ms;
		transition: all 100ms;
		opacity: .6;
		&:focus, &:active, &:valid {
			background-position-x: 6px;
			color: var(--color-primary-text);
			width: 155px;
			cursor: text;
			background-color: var(--color-primary) !important;
			border: 1px solid var(--color-primary-text-dark) !important;
		}
		&:hover, &:focus, &:active {
			opacity: 1;
		}
		& ~ .icon-close-white {
			display: inline;
			position: absolute;
			width: 30px;
			height: 100%;
			right: 0;
			top: 0;
			margin: 0;
			&, &:focus, &:active, &:hover {
				border: none;
				background-color: transparent;
			}
		}
		&:not(:valid) ~ .icon-close-white {
			display: none;
		}
		&::-webkit-search-cancel-button {
			-webkit-appearance: none;
		}
	}
}