html {
	--font-mono: Consolas, Monaco, 'Andale Mono', monospace;
	--font-body: 'Helvetica Neue', sans-serif;
	--font-heading: var(--font-body);
	--font-handwritten: 'Reenie Beanie', Marker Felt, cursive;
}

body {
	font: 100 100%/1.5 var(--font-body);
	font-family: var(--font-body);
	background: linear-gradient(45deg, silver 25%, transparent 25%, transparent 75%, silver 75%),
	            linear-gradient(45deg, silver 25%, transparent 25%, transparent 75%, silver 75%) 20px 20px;
	background-color: #eee;
	background-size: 40px 40px;
}

h1 {
	font-weight: bold;
	line-height: 1.2;
}

a {
	color: inherit;
}

strong, b {
	font-weight: bold; /* FF is weird */
}

code, textarea, pre {
	margin: 0;
	font: 100%/1.4 var(--font-mono);
	font-family: var(--font-mono);
	tab-size: 4;
}

	pre.delayed > code.delayed {
		opacity: 1;
	}

	pre > code {
		font-size: inherit;
	}

	.slide > pre:only-child {
		margin: auto;
	}

pre + pre {
	margin-top: 1.5em;
}

input:not([type=file]),
textarea:not([class]) {
	font: inherit;
	color: inherit;
}

	input[type="range"][orient="vertical"] {
		-webkit-appearance: slider-vertical;
		writing-mode: bt-lr;
	}

	input:not([type]),
	input[type="text"],
	input[type="email"],
	input[type="tel"],
	textarea:not([class]) {
		background: white;
		padding: 0 .3em;
		border: .05em solid hsl(200, 40%, 80%);
	}

button {
	font: inherit;
}

textarea.editor {
	border: 0;
	outline: none;
	width: 100%;
	max-height: 50vh;
	box-sizing: border-box;
	background: hsl(200, 10%, 20%) linear-gradient(rgba(0,0,0,.1) 50%, transparent 0);
	background-origin: content-box;
	background-size: auto 3em;
	background-attachment: local;
	box-shadow: 0 .1em .2em rgba(0,0,0,.3) inset;
}

div.editor {
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	color: white;
	line-height: 1.5;
}

textarea.editor,
div.editor > pre {
	padding: 1rem 2rem;
	line-height: inherit;
}

textarea.editor {
	display: block;
	color: white;
	-webkit-text-fill-color: transparent;
	white-space: pre;
}

div.editor > pre {
	position: absolute;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
	z-index: 1;
	margin: 0;
	pointer-events: none;
}

.slide {
	display: flex;
	flex-flow: column;
	align-items: stretch;
	padding: 2.5rem;
	background-color: black;
	color: white;
}

@media (max-width: 1024px) {
	.slide {
		padding: 3vmin;
	}
}

	.slide[data-source]::after {
		color: black;
		text-shadow: none;
	}

	.light.slide,
	.demo.slide {
		background: hsl(200, 40%, 90%);
		color: black;
	}

	.slide > h1 {
		text-align: center;
		margin: 0 0 .6em;
		font-size: 200%;
	}

	.slide h2 {
		color: yellowgreen;
		font-size: 120%;
	}

.image.slide > h1:only-child,
.image.slide > .caption,
.iframe.slide > h1 {
	/*bottom: .5em;
	margin: 0;*/
	text-shadow: none;
	font-weight: 100;
	background: rgba(0,0,0,.5);
	backdrop-filter: blur(4px);
}

.delayed.displayed,
.delayed-children > .displayed {
	opacity: 1;
}

section > header.slide {
	align-items: center;
	justify-content: center;
	background: url(img/htmlwallpaper.jpg) 50% 69% / cover;
}

section > header.slide:target {
	display: flex;
}

	section > header.slide > h1 {
		margin: auto;
		padding: .5em .7em;
		background: black;
		text-align: center;
		line-height: 1.2;
		font-weight: 100;
	}

#indicator {
	background: transparent;
	text-shadow: none;
	font-weight: 100;
}

::selection {
	background: hsl(335, 100%, 40%);
	color: white;
}

footer.ref a {
	position: absolute;
	bottom: 5vmin;
	text-decoration: none;
	font-size: 75%;
}

/* Syntax highlighting */

code.de-emphasize {
	opacity: .4;
}

.hint {
	position: absolute;
	top: -5px;
	left: 10px;
	font-size: .8rem;
	font-weight: bold;
	line-height: 1;
	color: rgba(0,0,0,.15);
	mix-blend-mode: multiply;
}

dialog {
	padding: 1em;
	border: 1px solid rgba(0,0,0,.5);
	box-shadow: .1em .1em .5em rgba(0,0,0,.5);
}

	dialog > h1 {
		background: hsl(200, 20%, 50%);
		color: white;
		margin: -1.25em -1.25em 1em;
		padding: 0 .5em .1em;
		font-size: 80%;
	}

	dialog > :last-child {
		margin-bottom: 0;
	}