@import url('https://fonts.googleapis.com/css2?family=Montserrat&display=swap');

:root {
	--border-color: #444;
	--text-color: #fff;
	--background-color: #111;
}

kbd {
	--white: hsl(0, 0%, 17.5%);
	--black-075: hsl(210, 4%, 26%);
	--black-300: hsl(210, 6.5%, 52%);
	--black-800: hsl(210, 9%, 91.5%);
	color: var(--black-800);
	text-shadow: 0 1px 0 var(--white);
	background-color: var(--black-075);
	border: 1px solid var(--black-300);

	box-shadow: 0 1px 1px hsla(210, 8%, 5%, 0.8);

	text-align: left;
	font: inherit;
	vertical-align: baseline;
	box-sizing: inherit;
	white-space: nowrap;
	display: inline-block;
	margin: 0 .1em;
	padding: .1em .6em;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI Adjusted", "Segoe UI", "Liberation Sans", sans-serif;
	font-size: 11px;
	line-height: 1.5;
	border-radius: 3px;
	overflow-wrap: break-word;
	border-color: transparent;
	border-top-color: hsl(210, 8%, 45%);
}

@media (prefers-color-scheme: light) {
	:root {
		--text-color: #000;
		--background-color: #fff;
	}

	kbd {
		--white: hsl(0, 0%, 100%);
		--black-075: hsl(210, 8%, 90%);
		--black-300: hsl(210, 8%, 65%);
		--black-800: hsl(210, 8%, 15%);
		box-shadow: 0 1px 1px hsla(210, 8%, 5%, 0.15), inset 0 1px 0 0 hsl(0, 0%, 100%);
	}
}

* {
	box-sizing: border-box;
}

html {
	--grid-size: 25;
}

body {
	display: flex;
	margin: 0;
	height: 100vh;

	background-color: var(--background-color);
	color: var(--text-color);

	font-family: 'Montserrat', sans-serif;
}

h1,
h2 {
	text-align: center;
}

#right {
	flex: 1;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
}

#cells {
	--cell-size: 2em;
	display: grid;
	grid-template-columns: repeat(var(--grid-size), var(--cell-size));
	grid-auto-rows: var(--cell-size);
	gap: 1px;
}

.cell {
	overflow: hidden;
	padding: 0;
	line-height: 1;
	border: none;
	outline: 1px solid var(--border-color);
	color: var(--text-color);
	background: none;
	resize: none;
	font-size: var(--cell-size);
	text-align: center;
	font-family: monospace;
}

#controls {
	width: 40ch;
	background-color: rgba(0, 0, 0, 0.2);
	padding: 0 1em;
}

#controls table {
	width: 100%;
	border-collapse: collapse;
	margin-top: 1em;
}

#controls label {
	margin-bottom: 0.25em;
	display: block;
}

#controls button {
	margin-right: 1em;
}

th,
tr:nth-child(even) td {
	background-color: rgba(255, 255, 255, 0.1);
}

tr:nth-child(odd) td {
	background-color: rgba(255, 255, 255, 0.2);
}

td,
th {
	text-align: center;
	border: 1px solid var(--text-color);
	padding: 5px;
}