@namespace epub "http://www.idpf.org/2007/ops";

body{
	display: flex;
	flex-direction: column;
	font-family: "Georgia", serif;
	font-size: 18px;
	margin: 0;
	min-height: 100vh;
}

main{
	flex-grow: 1;
	margin: 5rem auto 3rem;
	max-width: 55ch;
	padding: 0 3rem;
	width: calc(100% - 2 * 3rem); /* calc instead of box-sizing: border-box which would make max-width count padding */
}

body > header{
	all: unset; /* Remove any properties set by selectors in the ebook itself */
	background: #fff;
	border-bottom: 1px solid #999;
	box-shadow: 0 0 3px #ccc;
	left: 0;
	position: absolute;
	right: 0;
	top: 0;
	z-index: 1000; /* Required so that SVGs don't scroll over the header */
}

body > header ul{
	align-items: center;
	display: flex;
	list-style: none;
	margin: 0;
	padding: 1em;
}

body > header li{
	margin-left: 1.5em;
}

body > header li:first-child{
	margin-left: 0;
	margin-right: auto;
}

body > header li:first-child > a{
	background: no-repeat center / 100% url("/images/logo-full.svg");
	display: block;
	font-size: 0;
	height: 42px;
	transition: transform 200ms ease;
	width: 180px;
}

body > header li:first-child > a:hover{
	transform: scale(1.025) rotate(1deg);
}

body > footer ul{
	display: flex;
	justify-content: space-between;
	list-style: none;
	margin: 0;
	padding: 0.5em 1em;
}

body > footer li{
	max-width: 40%;
}

body > main > section[epub|type~="titlepage"],
body > main > section[epub|type~="halftitlepage"]{
	min-height: auto;
}

nav + section,
section + nav,
section + section,
section + article,
article + section,
article + article{
	box-sizing: border-box;
	margin-top: 12em !important;
	padding: 0;
}

nav[epub|type~="toc"] ol{
	list-style: none;
}

@media(max-width: 65ch){
	main{
		padding: 0 2rem;
		width: calc(100% - 2 * 2rem);
	}

	section[epub|type~="imprint"] p{
		width: 100%;
	}
}

@media(prefers-color-scheme: dark){
	body,
	body > header{
		background: #222222;
		color: #ffffff;
	}

	/* These three link colors provide WCAG AAA compliance at 16px */
	a:link{
		color: #6bb9f0;
	}

	a:active{
		color: #e6cc22;
	}

	a:visited{
		color: #dda0dd;
	}

	body > header li:first-child > a,
	img[epub|type~="se:image.color-depth.black-on-transparent"]{
		filter: invert(1);
	}
}

/* As of July 2022 Chrome on Android doesn't yet understand `or (pointer: none)`
and will just drop this entire query together if it's included. */
@media(pointer: coarse){
	body > header{
		position: fixed;
	}

	body > header li:first-child > a{
		height: 21px;
		width: 90px;
	}

	nav[epub|type~="toc"] ol li{
		margin-bottom: 2em;
		margin-top: 2em;
	}

	*[id]{
		scroll-margin-top: 3em;
	}
}