docs/source/_static/scss/includes/_header.scss

.header {
	background-color: var(--header-bg);
	box-shadow: 0 0 0.75rem rgba($black, 0.1);
	width: 100%;
	position: relative;
	z-index: $z-index-header;
	
	& > .container {
		position: relative;
	}

	&.inactive {
		display: none;
	}
}

.header__top {
	align-items: center;
	gap: 0.5rem;
	border-bottom: 1px solid var(--nav-top-border-color);
	display: flex;
	padding: 0.4rem 0;
	height: 3rem;

	.nav {
		font-size: $font-size-sm;
		margin: 0 -1rem 0 auto !important;
	}
}

.header__logo {
	& > svg {
		width: 6.25rem;
		fill: var(--logo-fill-color);
	}
}

.header__title {
	line-height: 100%;
    font-weight: 500;
    color: var(--header-headings-color);
	margin-left: 0.5rem;
    font-size: $font-size-sm;
	padding-bottom: 0.1rem;
}

.header__actions {
	flex-shrink: 0;
	white-space: nowrap;
	display: flex;
	gap: 0.5rem;
	margin-left: auto;

	.icon {
		&:not(.icon--switch) {
			& > svg {
				fill: var(--header-text-color);
			}

			&:hover {
				background-color: var(--header-actions-icon-alt-hover-bg);
			}
		}
	}

	.icon--switch {
		transition: background-color 500ms, border-color 500ms;
		background-color: var(--header-actions-icon-bg);
		border-color: var(--header-actions-icon-border-color);

		&:hover {
			background-color: var(--header-actions-icon-hover-bg);
		}

		& > svg {
			stroke: var(--header-actions-icon-stroke);
			stroke-width: var(--header-actions-icon-stroke-width);

			&:last-child {
				& > path {
					&:last-child {
						fill: var(--header-actions-icon-path-fill);
					}
				}
			}
		}
	}
}

#read-mode-toggle {
	@include breakpoint-max(breakpoints(xl)) {
		display: none;
	}
}

:root {
	&:not(.read-mode) {
		.header__actions {
			position: absolute;
			bottom: 2rem;
			right: var(--content-padding);
		}

		.header__hero {
			text-align: center;
			padding: 3rem 0 2rem;

			& > h2 {
				font-size: 3rem;
				font-weight: $font-weight-bold;
				color: var(--header-headings-color);
				margin: 0 0 2rem;
			}
		}
	}

	&.read-mode {
		.header__top {
			border: 0;
		}

		.header__logo {
			& > svg {
				width: 5rem;
			}
		}

		.header__hero {
			position: absolute;
			right: 0;
			width: 100%;
			height: $search-height;
			padding: 0 var(--content-padding);
			top: 3.3rem;
			
			& > h2 {
				display: none;
			}

			@include breakpoint-min(breakpoints(xl)) {
				max-width: 31.5rem;
				
			}

			@include breakpoint-max(breakpoints(lg)) {
				top: 7.2rem
			}

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