@import url("fonts/fonts.css");
/* See fonts/LICENSE.md */


/* Base */

:root {
	--primary-color: #60c030;
	--secondary-color: #ffffff;
	--background-color: hsl(100, 10%, 10%);
	--foreground-color: hsl(100, 10%, 80%);
	--foreground-dim-color: hsla(100, 10%, 80%, 70%);
	--link-color: hsl(100, 100%, 70%);
	--link-dim-color: hsla(100, 100%, 70%, 50%);
	--separator-color: hsla(100, 10%, 80%, 50%);
	--box-shadow-style: inset 0 -1px 0;
	--fast: 0.2s;
	--slow: 0.4s;
}

*, *::before, *::after {
	max-width: 100%;
	transition: all var(--fast);
}


/* Typography */

html {
	/* 1rem works out at 20px. */
	font-size: 1.25em;
}

body {
	background-color: var(--background-color);
	color: var(--foreground-color);
	font-family: "HK Grotesk", sans-serif;
	font-variant-ligatures: no-common-ligatures;
	font-weight: 300;
	line-height: 2rem;
}

code, kbd, samp {
	font-family: "Fira Mono", monospace;
	/* Better match surrounding HK Grotesk. */
	font-size: 0.9rem;
}


/* Layout */

html, body {
	margin: 0;
	padding: 0;
}

body {
	display: grid;
	grid-template-columns: 1rem 1fr minmax(1rem, 40rem) 1fr 1rem;
}

	body > * {
		grid-column: 3/4;
	}

.visuallyhidden {
	position: absolute !important;
	top: -9999em !important;
	left: -9999em !important;
}


/* Top and bottom navigation, article footer */

.topnav {
	margin-top: 10vh;
	margin-bottom: 1rem;
}

footer {
	border-top: 1px solid var(--separator-color);
	margin-top: -1px;
	margin-bottom: 1rem;
}

.bottomnav {
	border-top: 1px solid var(--separator-color);
	margin-top: -1px;
	margin-bottom: 10vh;
}


/* Logo */

.logo {
	display: block;
	position: relative;
	height: 4rem;
	width: 4rem;
	margin-bottom: -0.5rem;
	margin-left: auto;
	margin-right: auto;
	padding-bottom: 0.5rem;
}
	
	.logo circle {
		fill: var(--primary-color);
		stroke-width: 0;
	}
	
	.logo path {
		fill: var(--secondary-color);
	}
	
	.bottomnav .logo {
		margin-top: 2rem;
	}
	.bottomnav .logo circle {
		fill: transparent;
		stroke: var(--foreground-dim-color);
		stroke-width: 12px;
	}
	
	.bottomnav .logo path {
		fill: var(--foreground-dim-color);
	}
	
	.bottomnav a .logo circle {
		stroke: var(--link-color);
	}
	
	.bottomnav a .logo path {
		fill: var(--link-color);
	}


.logo span {
	display: block;
	position: absolute;
	top: 0;
	left: 5rem;
	line-height: 4rem;
	opacity: 0;
	transition-property: opacity;
}

	.logo:focus span,
	.logo:hover span {
		height: auto;
		width: auto;
		opacity: 1;
	}


/* Nearby pages */

nav.nearby {
	display: block;
	margin-top: 1rem;
}
	
	nav.nearby ul,
	nav.nearby li {
		display: inline;
		margin: 0;
		padding: 0;
	}
	
	nav.nearby li {
		grid-row: 1/2;
	}
	
	nav.nearby li.up {
		grid-column: 2/3;
	}
	
	nav.nearby li.next {
		grid-column: 3/4;
	}
	
	nav.nearby li.prev {
		grid-column: 1/2;
	}
	
	nav.nearby a {
		display: block;
		margin-top: 1rem;
		margin-right: 1rem;
	}
		
	nav.nearby a span {
		display: inline-block;
		width: 1rem;
		margin-right: 1rem;
	}
	
	nav.nearby a[rel="up"] span {
		content: "↑ ";
	}
	
	nav.nearby a[rel="next"] span {
		content: "→ ";
	}
	
	nav.nearby a[rel="prev"] span {
		content: "← ";
	}
	
	@media (min-width: 42rem) {
		nav.nearby ul {
			display: grid;
			grid-template-columns: 1fr 1fr 1fr;
			margin-right:0;
		}
	
		nav.nearby a {
			margin-top: 0;
			margin-right: 0;
			text-align: center;
		}
		
		nav.nearby a span {
			width: 100%;
		}
		
		nav.nearby a[rel="up"] {
			text-align: center;
		}
		
		nav.nearby a[rel="next"] {
			text-align: right;
		}
		
		nav.nearby a[rel="prev"] {
			text-align: left;
		}
	}


/* Page heading */

header {
	margin-bottom: 1rem;
}
	
	.pagetitle {
		margin-top: 0;
		margin-bottom: 0;
		padding-top: 1rem;
		padding-bottom: 1rem;
		font-size: 2rem;
		line-height: 2rem;
		text-align: center;
	}

summary {
	display: block;
	box-shadow: var(--box-shadow-style) transparent;
	cursor: pointer;
}
	
	summary:focus,
	summary:hover {
		outline: 0;
		box-shadow: var(--box-shadow-style) currentColor;
	}
	
	summary::before {
		content: "⋮";
		line-height: 2rem;
		width: 1rem;
		padding-top: 1rem;
		padding-left: 1rem;
		float: right;
		text-align: center;
	}
	
	details[open] summary::before {
		content: "×";
	}
	
	summary::-webkit-details-marker {
		display: none;
	}
	
	summary h1::before {
		/* Keep the summary centred. */
		content: " ";
		height: 2rem;
		width: 1rem;
		padding-right: 1rem;
		float: left;
	}

details > section {
	border-bottom: 1px solid var(--separator-color);
	margin-top: 1rem;
	padding-bottom: calc(1rem - 1px);
}
	
	details > section > * {
		display: inline-block;
		margin-top: 0;
		margin-bottom: 0;
		margin-right: 1rem;
		opacity: 0;
		transition: opacity var(--slow);
	}
	
	details[open] > section > * {
		opacity: 1;
	}
	
header .image {
	/* The height is overridden by inline styles for some articles. */
	height: 4rem;
	background-position: center;
	background-size: cover;
	opacity: 0.5;
}


/* Lists of links */

footer .smalllinks {
	margin-top: 1rem;
	margin-bottom: 1rem;
}
	
	.smalllinks ul {
		display: inline;
		padding-left: 0;
	}
	
	.smalllinks li {
		display: inline;
	}
	
	.smalllinks h2,
	.smalllinks a {
		display: inline-block;
		margin-top: 0;
		margin-bottom: 0;
		margin-right: 1rem;
	}

.biglinks {
	margin-top: 1rem;
	margin-bottom: 1rem;
	padding-left: 0;
	list-style-type: none;
}
	
	.biglinks li {
		margin-top: 1rem;
		color: var(--foreground-dim-color);
	}
	
	.biglinks li a {
		display: block;
	}
	
	.biglinks li a > * {
		display: inline-block;
		margin-right: 1rem;
	}
	
	.biglinks li strong {
		display: inline-block;
		margin-top: 0;
		margin-bottom: 0;
		font-weight: 600;
	}

.biglinks li a strong ~ * {
	color: var(--foreground-dim-color);
}
	
	.biglinks li a:focus strong ~ *,
	.biglinks li a:hover strong ~ * {
		color: var(--link-color);
	}


/* Headings */

h1, h2, h3, h4, h5, h6 {
	margin-top: 0;
	margin-bottom: 0;
	font-size: 1rem;
	font-weight: 300;
}
	article > main h1,
	article > main h2,
	article > main h3,
	article > main h4,
	article > main h5,
	article > main h6 {
		margin-top: 2rem;
		margin-bottom: 1rem;
	}
	
	article > main section h1,
	article > main h4 {
		font-size: 1.7rem;
	}
	
	article > main section section h1,
	article > main h5 {
		font-size: 1.4rem;
	}
	
	article > main section section section h1,
	article > main h6 {
		font-size: 1.1rem;
	}


/* Common structures */

a {
	text-decoration: none;
}
	:link, :visited {
		color: var(--link-color);
		font-weight: 400;
		opacity: 0.8;
		box-shadow: var(--box-shadow-style) transparent;
	}
	
	:link:focus,
	:link:hover,
	:visited:focus,
	:visited:hover {
		opacity: 1;
		filter: none;
		box-shadow: var(--box-shadow-style) currentColor;
		outline: 0;
	}
	address :link,
	address :visited,
	p :link,
	p :visited {
		box-shadow: var(--box-shadow-style) var(--link-dim-color);
	}

address {
	font-style: inherit;
}

aside {
	font-style: italic;
}

blockquote {
	margin-left: 2rem;
	margin-right: 2rem;
}

figure {
	margin-left: 0rem;
	margin-right: 0rem;
}
	
	figure + figure {
		border-top: 1px solid var(--separator-color);
		margin-top: -1px;
	}
	
	figcaption {
		margin-left: 2rem;
		margin-right: 2rem;
	}
	
	figcaption > * {
		display: inline-block;
		margin-right: 1rem;
	}

hr {
	height: 0;
	border: 0;
	border-top: 1px solid var(--separator-color);
	margin-top: calc(1rem - 1px);
	margin-bottom: 1rem;
	padding: 0;
}

img, object {
	display: inline-block;
	margin-left: auto;
	margin-right: auto;
	text-align: center;
}

.inset {
	max-width: 50%;
	float: right;
	margin-left: 1rem;
}

ol, ul {
	margin-left: 0;
	padding-left: 1rem;
}

p {
	margin-top: 1rem;
	margin-bottom: 1rem;
}

pre {
	line-height: 1rem;
}

small {
	font-size: 1rem;
}

strong {
	/* Without this, the weight increases from 300 to 400,
	   which isn't distinct enough. */
	font-weight: 600;
}