.header {
	backface-visibility: hidden;
	background-color: $offwhite-solid;
	color: $black-text-solid;
	min-height: $header-height;
	padding-top: (($header-height - $nav-height) / 2);
	padding-bottom: (($header-height - $nav-height) / 2);
	z-index: $header-base;
	&:after {
		box-shadow: 0 1px 10px rgba(0, 0, 0, 0.5);
		content: "";
		display: block;
		height: 100%;
		opacity: 0;
		position: absolute;
			top: 0;
			left: 0;
		transition: opacity 0.3s $timing;
		width: 100%;
		z-index: -1;
	}
	&.affix:after {
		opacity: 1;
	}
	a {
		color: inherit;
		z-index: 1;
	}
	.nav {
		margin: 0;
	}
	.tab-nav {
		box-shadow: none;
		margin-top: (($header-height - $nav-height) / -2);
		margin-bottom: (($header-height - $nav-height) / -2);
		.nav > li {
			> a,
			> .a {
				padding-top: (($header-height - $line-height) / 2);
				padding-bottom: (($header-height - $line-height) / 2 - 2);
			}
		}
	}
}

// colour
	@each $color in $palette-list-class {
		$i: index($palette-list-class, $color);

		.header-#{$color} {
			background-color: nth($palette-list-color, $i);
			color: nth($palette-list-text, $i);
		}
	}

.header-affix {
	max-height: $nav-height;
	overflow: hidden;
	position: static !important;
	width: 0;
	&.affix {
		overflow: visible;
		width: auto;
	}
}

.header-affix-hide {
	position: static !important;
	&.affix {
		max-height: $nav-height;
		overflow: hidden;
		width: 0;
	}
}

.header-logo,
.header-text {
	display: block;
	float: left;
	font-weight: $font-weight-light;
	height: $nav-height;
	line-height: $line-height-h4;
	margin: 0 $grid-gutter;
	padding: (($nav-height - $line-height-h4) / 2) 0;
	&:focus,
	&:hover {
		text-decoration: none;
	}
}

.header-logo {
	font-size: $font-size-h4;
	img {
		display: block;
		max-height: $line-height-h4;
		width: auto;
	}
}

.header-seamed,
.header-standard,
.header-waterfall {
	position: fixed;
		top: 0;
		right: 0;
		left: 0;
}

.header-standard {
	&:after {
		opacity: 1;
	}
}

.header-transparent {
	background-color: transparent;
	&:before {
		background-color: $offwhite-solid;
		content: "";
		display: block;
		height: 100%;
		opacity: 0;
		position: absolute;
			top: 0;
			left: 0;
		transition: opacity 0.3s $timing;
		width: 100%;
		z-index: -1;
	}
	&.affix:before {
		opacity: 1;
	}
}

// colour
	@each $color in $palette-list-class {
		$i: index($palette-list-class, $color);

		.page-#{$color} .header-transparent {
			color: nth($palette-list-text, $i);
			&:before {
				background-color: nth($palette-list-color, $i);
			}
		}
	}