:root {
	/* Sensible defaults; overridden live by index.js once the camera starts. */
	--bg: hsl(220 50% 100%);
	--bg-1: hsl(220 50% 90%);
	--bg-2: hsl(220 50% 80%);
	--bg-3: hsl(220 50% 70%);
	--bg-4: hsl(220 50% 60%);
	--fg: hsl(190 50% 00%);
	--fg-1: hsl(190 50% 10%);
	--fg-2: hsl(190 50% 20%);
	--fg-3: hsl(190 50% 30%);
	--fg-4: hsl(190 50% 40%);
	--accent: hsl(200 90% 50%);
	--transition-time: 1s;
}

* {
	box-sizing: border-box;
}

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

body {
	font-family: system-ui, sans-serif;
	font-size: 1rem;
	line-height: 1.6;
	min-height: 100vh;
	background: var(--bg);
	color: var(--fg);
	transition: background var(--transition-time) ease, color var(--transition-time) ease;
	padding: 2em;
}

header, main, footer {
	max-width: 60rem;
	margin: 0 auto;
}

h1 {
	font-size: 2.5rem;
	margin: 0 0 0.5rem;
	color: var(--fg-1);
	text-shadow: 0 0 0.25rem var(--bg-1);
}

h2 {
	font-size: 1.5rem;
	margin: 0 0 0.75rem;
	color: var(--fg-2);
}

header p {
	font-size: 1.125rem;
	color: var(--fg-3);
}

.card {
	background: var(--bg-2);
	border: thin solid var(--fg-4);
	border-radius: 0.75rem;
	padding: 1.5rem;
	margin: 1.5rem 0;
	color: var(--fg);
	transition: background var(--transition-time) ease, border-color var(--transition-time) ease, color var(--transition-time) ease;
}

.card--accent {
	background: var(--bg-3);
	border-color: var(--accent);
}

.card ol, .card p {
	margin: 0.5rem 0;
}

code {
	font-family: ui-monospace, monospace;
	font-size: 1rem;
	background: var(--bg-4);
	color: var(--fg-1);
	padding: 0 0.25rem;
	border-radius: 0.25rem;
}

a, a:visited {
	color: var(--accent);
	text-decoration-color: var(--fg-3);
}

button {
	font: inherit;
	color: var(--bg-1);
	background: var(--accent);
	border: thin solid var(--fg-2);
	border-radius: 0.5rem;
	padding: 0.5rem 1rem;
	cursor: pointer;
	transition: background var(--transition-time) ease, color var(--transition-time) ease;
}

button:hover {
	background: var(--fg-2);
	color: var(--bg-1);
}

.muted {
	color: var(--fg-3);
	font-size: 1rem;
}

.control {
	display: flex;
	align-items: center;
	gap: 1rem;
	flex-wrap: wrap;
}

.control label {
	flex: 0 0 auto;
}

.control input[type="range"] {
	flex: 1 1 14rem;
	min-width: 0;
	accent-color: var(--accent);
}

.control output {
	font-variant-numeric: tabular-nums;
}

.preview {
	display: flex;
	gap: 1rem;
	align-items: stretch;
	flex-wrap: wrap;
}

#camera,
#frame {
	flex: 1 1 14rem;
	min-width: 0;
	width: 100%;
	height: auto;
	aspect-ratio: 16 / 9;
	object-fit: cover;
	border-radius: 0.5rem;
	border: thin solid var(--fg-4);
	background: var(--bg-1);
	transform: scaleX(-1); /* mirror like a selfie cam */
}

#frame {
	image-rendering: pixelated;
}

.swatches {
	display: flex;
	flex-wrap: wrap;
	gap: 0.5rem;
	margin-top: 0.75rem;
}

.swatch {
	display: inline-block;
	width: 2.5rem;
	height: 2.5rem;
	border-radius: 0.5rem;
	border: thin solid var(--fg-4);
}

.swatch--fg {
	border-style: dashed;
}

footer {
	text-align: center;
	color: var(--fg-3);
	font-size: 1rem;
}