* {box-sizing: border-box;}

html {
	/* font-family: 'HelveticaNeue-Light', Helvetica, Arial, sans-serif; */
	font-family: "PT Sans", Verdana, Helvetica, Arial, sans-serif;
	font-weight: lighter;
	min-height: 100%;
}

html {
	--main-color: #111;
	--main-background-color: #fff;
	
	--header-color: #eee;
	--underlay-color: #ddd;
	
	--accent-color: #0062b3;
	--accent-hover-color: #33a3ff;
	
	--overlay-color: rgba(255, 255, 255, 0.9);
	--underlay-color: rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: dark) {
	html {
		--main-color: #e1e1e1;
		--main-background-color: #111;
		
		--header-color: #222;
		--overlay-color: #333;
		
		--accent-color: #01b9ff;
		--accent-hover-color: #80dcff;
		
		--overlay-color: rgba(0, 0, 0, 0.8);
		--underlay-color: rgba(0, 0, 0, 1.0);
		
		background-color: black;
	}
}

body {
	padding: 0;
	margin: 0;
	
	color: var(--main-color);
	background-color: var(--main-background-color);
}

/* Page Navigation Bar */

nav {
	position: relative;
	white-space: nowrap;
}

nav ul.trail {
	padding: 0;
	margin: 0;
}

nav li {
	display: inline-block;
	list-style: none;
}

#header {
	width: 100%;
	
	background: var(--header-color);
	margin: 0;
	
	display: flex;
	flex-direction: column;
	justify-content: flex-end;
	
	text-align: center;
}

#header h1 {
	margin: 1rem 2rem;
}

#header nav {
	padding: 1rem;
	width: 100%;
	
	background-color: inherit;
	
	z-index: 5;
}

#header.sticky nav {
	position: fixed;
	
	left: 0; right: 0;
	top: 0;
}

a {
	color: var(--accent-color);
	text-decoration: none;
}

a:hover {
	color: var(--accent-hover-color);
}

main {
	margin: auto;
	max-width: 46rem;
}

p, ul, dl, figure {
	margin: 2rem 1rem;
}

section.articles {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-around;
}

section.articles a {
	box-sizing: border-box;
	-flex-basis: 20rem;
	flex-grow: 1;
	
	margin: 1rem;
	position: relative;
	background-color: white;
	
	width: 15rem;
	height: 15rem;
	
	background-size: cover;
	background-position: center;
	text-decoration: none;
	
	box-shadow: 0 0 0.5rem var(--underlay-color);
	
	overflow: hidden;
	
	display: flex;
	flex-direction: column;
	justify-content: flex-start;
}

section.articles a > * {
	padding: 0.5rem;
	background-color: var(--overlay-color);
}

section.articles small {
	opacity: 0;
	transition: 0.2s;
	color: var(--main-color);
}

section.articles a:hover small {
	opacity: 1;
	display: block;
}

main {
	margin-top: 4rem;
}

main > section, main > article, main > header {
	margin-bottom: 4rem;
}

main header {
	text-align: center;
}

main header span {
	line-height: 2rem;
	margin: 0 2rem;
	white-space: nowrap;
}

footer {
	clear: both;
	text-align: center;
	padding: 1.25rem;
}

pre {
	tab-size: 2;
	-moz-tab-size: 2;
	overflow: auto;
	margin: 0;
}

pre, code {
	/* Same size as paragraph and other normal text. */
	font-size: 16px;
}

pre code {
	display: block;
}

figure {
	text-align: center;
	padding: 0.2rem;
}

figure.diagram {
	background-color: white;
	border-radius: 1rem;
}

figure.listing {
	text-align: left;
}

figure img {
	max-width: 100%;
}

figure figcaption {
	text-align: center;
	color: #999;
	
	margin: 0;
	padding: 0;
}

p {
	/* text-align: justify; */
}

ul ul {
	margin: 0.5rem;
}

@media (min-width: 40em) {
	pre {
		tab-size: 4;
		-moz-tab-size: 4;
	}
	
	p {
		text-align: left;
	}
}

p.discussion {
	background-color: rgba(0, 0, 0, 0.5);
	padding: 1rem;
	
	border-radius: 1rem;
}

div.centered {
	text-align: center;
}

main h1, main h2, main h3, main h4 {
	font-weight: normal;
	filter: brightness(150%);
	
	margin: 1rem 0.5rem 2rem;
	/* This was added to fix linking to anchors with the fixed <nav>. Maybe in the future consider scroll-padding-top. */
	padding-top: 5rem;
	
	letter-spacing: 0.12rem;
}

main h1 {
	margin-top: 0;
}

main h2 + p, main h3 + p {
	margin-top: 0;
}

footer {
	clear: both;
	text-align: center;
	padding: 1.25rem;
}

li {
	margin: 0.25rem;
}

dl.basic dt {
	text-decoration: underline;
	padding-top: 0.25rem;
}

dl.basic dd {
	padding: 0.25rem;
}

dl.basic dt {
	margin-top: 1.5rem;
}

dl.options {
	padding-top: 0.5rem;
	margin: 0;
	
	/* background: rgba(230, 230, 230, 0.25);
	border: 0.0625rem solid #ccc; */
}

dl.options dt {
	opacity: 0.5;
	
	float: left;
	clear: both;
	
	width: 30%;
	text-align: right;
	
	padding: 0 0.5rem 0.5rem 0.5rem;
}

dl.options dd {
	margin: 0 0 0.5rem 32%;
	padding: 0 0.4rem;
}

dl.options dd + dd {
	margin-top: 0.5rem;
}

dl.options dd.container {
	border-left: 0.0625rem solid #ccc;
}

dl.options dd.container p {
	margin-top: 0;
	margin-bottom: 0;
}

#entry {
	padding-bottom: 5rem;
}

img {
	border: none;
}

.diagram {
	text-align: center;
}

table.basic {
	border-collapse: collapse;
	margin: auto;
	width: 90%;
}

table th {
	font-weight: inherit;
}

table.basic thead th, table.basic tfoot th {
	font-family: "Lucida Grande", Sans-Serif;
	font-size: 110%;
	text-align: left;
}

table.basic thead th {
	border-bottom: 0.125rem solid var(--accent-color);
	padding: 0.625rem 0.5rem;
}

table.basic tfoot th {
	border-bottom: 0.125rem solid var(--accent-color);
	padding: 0.625rem 0.5rem;
}

table.basic tbody th,
table.basic tbody td {
	border: none;
	padding: 0.5625rem 0.5rem 0rem 0.5rem;
}

table.basic tbody th {
	text-align: left;
	text-decoration: underline;
	padding-top: 0.75rem;
}

table.data th {
	background-color: var(--header-color);
	padding: 0.25rem;
}

table.data {
	background-color: var(--underlay-color);
	
	margin: auto;
	text-align: center;
}

table.data td {
	padding: 0.25rem;
}

form label {
	display: block;
	margin: 0.5rem 0;
}

button, input, textarea {
	border-radius: 0.2rem;
	border: 0.1rem solid;
	
	margin: 0.2rem 0.2rem;
	padding: 0.2rem;
}

@media(prefers-color-scheme: dark) {
	input[type=submit] {
		background-color: #ccc;
	}

	input[type=submit]:active {
		background-color: #aaa;
		border-color: #666;
	}

	input, textarea {
		background-color: #222;
		color: #fff;
		border-color: #444;
	}

	input[type=submit] {
		border-color: #aaa;
		background-color: #444;
		color: #ccc;
	}

	input[type=submit]:active {
		border-color: #444;
		background-color: #222;
		color: white;
	}
}

form label input, form label textarea {
	display: block;
	margin: 0.5rem 0;
	padding: 0.5rem;
}

form fieldset {
	border: none;
	margin: 0;
	padding: 0;
}

form fieldset.footer {
	text-align: right;
}

form#login fieldset input {
	max-width: 6rem;
}

form.basic input:not([type=button]):not([type=reset]):not([type=submit]) {
	width: 70%;
}

form.basic input:invalid,
form.basic textarea:invalid {
	border-color: red;
}

form.basic textarea {
	box-sizing: border-box;
	width: 100%;
}

audio {
	width: 100%;
}

.latex.inline {
	padding: 0rem 0.3125rem 0rem;
	vertical-align: middle;
}

/* Entry Footnotes */

sup a {
	text-decoration: none;
}

/* Google Maps */

.google-map {
	width: 50rem;
	height: 37.5rem;
	margin-left: auto;
	margin-right: auto;
}

/* Blockquotes */

blockquote {
	margin-top: 2rem;
	margin-bottom: 2rem;
}

.comment blockquote {
	border-left: 0.2rem solid #888;
}

blockquote .spoken:before {
	content: "“";
}
 
blockquote .spoken:after {
	content: "”";
}

blockquote .spoken:first-letter {
}

blockquote .spoken {
	font-family: "Adobe Caslon Pro", "Hoefler Text", Georgia, Garamond, Times, serif;
	
	letter-spacing: 0.1rem;
	text-align: center;
	font-variant: small-caps;
}

blockquote > .written {
	border-left: 2px solid blue;
	padding-left: 1rem;
}

blockquote cite {
	display: block;
	font-style: normal;
	text-align: right;
	margin-top: 1rem;
}

blockquote cite:before {
	content: " — ";
}

/* Features */

ul.features {
	list-style: none;
}

ul.features li {
	background-image: url("/_static/plus.png");
	padding-left: 2rem;
	
	background-repeat: no-repeat;
	margin-bottom: 0.5rem;
}

/* Journal comments */

section.comments h1 {
	margin-top: 8rem;
}

section.comments .comment .byline {
	padding: 0.5rem 0.25rem;
	display: flex;
	justify-content: space-between;
}

section.comments .comment .byline .summary {
	display: flex;
	flex-direction: column;
	justify-content: flex-end;
}

section.comments .comment .byline .details {
	display: flex;
	justify-content: space-between;
}

section.comments .comment .moderation {
	text-align: center;
	padding: 1rem;
}

section.comments .comment .byline .tools {
	text-align: right;
	padding-bottom: 0.2rem;
}

section.comments .comment .byline .icon {
	display: flex;
	flex-direction: column;
	justify-content: flex-end;
	align-items: flex-start;
	
	margin: 0 0.5rem 0 0;
}

section.comments .comment .byline .summary {
	flex-grow: 1;
}

section.comments .comment .byline .posted_on {
	color: #999;
	
	display: flex;
	flex-direction: column;
	justify-content: flex-end;
	align-items: flex-start;
}

section.comments .comment .body {
	margin: 0.125rem;
	border-top: 0.0625rem solid #ccc;
}

section.comments .comment pre {
	margin: 1.0rem;
}

/* Journal navigation */

.navigation {
	clear: both;
	
	margin: 1rem 0 1rem 0;
}

.navigation .prev_link {
	float: left;
}

.navigation .next_link {
	float: right;
}

/* Translations header */

li.locale {
	background-repeat: no-repeat;
	background-position: 0 50%;
	padding-left: 1.25rem;
}

/* Make youtube videos retain their 16:9 aspect ratio as they scale */

.youtube-wrapper {
	position: relative;
	
	/* 16:9 aspect ratio */
	padding-bottom: 56.25%;
	
	height: 0;
	width 100%;
}

.youtube-video {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}

section.sponsors {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-around;
}

section.sponsors a {
	position: relative;
	
	margin: 1rem;
	
	width: 15rem;
	height: 15rem;
	
	background-size: contain;
	background-position: center;
	background-repeat: no-repeat;
	
	border-radius: 2rem;
	
	border: 1rem solid white;
	background-color: white;
	
	box-shadow: 0 0 0.5rem var(--underlay-color);
}