body {
	font-family: Helvetica, sans-serif;
	color: #000;
	--tile-margin: 5%;
	--tile-color: #eca;
	--button-background-color: #eee;
	--button-outline-color: #333;
	--hl-nothing-color: #f00;
	--hl-selected-color: #00f;
	--hl-border-color: rgba(60,60,60,0.6);
	--hl-all-correct-color: #0a0;
	--hl-some-mistakes-color: #f80;
	--square-color: #dde;
	--double-letter-color: #acf;
	--triple-letter-color: #afc;
	--double-word-color: #fac;
	--triple-word-color: #c66;
	--select-tile-border-color: black;
	--select-tile-possible-color: #8c7;
	--select-tile-placing-color: #aff;
	--select-tile-not-possible-color: #d99;
	--submit-outline-color: #00a;
	--submit-border-color: #55a;
	--submit-background-color: #ddf;
	--submit-hover-color: #bbf;
	--solution-letter-wrong-color: #800;
	--solution-letter-correct-color: #060;
	--solution-letter-missed-color: #00a;
}
body.dark-mode {
	background-color: #112;
	color: #f8f8f8;
	--square-color: #445;
	--tile-color: #520;
	--button-outline-color: #ccc;
	--button-background-color: #223;
	--hl-border-color: rgba(200,200,200,0.4);
	--hl-selected-color: #0ff;
	--double-letter-color: #569;
	--triple-letter-color: #465;
	--double-word-color: #525;
	--triple-word-color: #822;
	--select-tile-border-color: #ccc;
	--select-tile-possible-color: #272;
	--select-tile-placing-color: #466;
	--submit-outline-color: #8fc;
	--submit-border-color: #5ac;
	--submit-background-color: #266;
	--submit-hover-color: #488;
	--solution-letter-wrong-color: #faa;
	--solution-letter-correct-color: #afa;
	--solution-letter-missed-color: #9ff;
}
.dark-mode a {
	color: #afc;
}
.dark-mode textarea {
	background-color: transparent;
	border: 2px solid #fff;
	color: inherit;
}
button {
	color: inherit;
	background-color: var(--button-background-color);
	outline: 2px solid var(--button-outline-color);
	border: 0;
	border-radius: 2px;
	margin: 6px;
}
/* use minimal margins on small screens,
   to maximize available space for board. */
@media (width < 15cm) {
	body {
		margin: 2px;
		--tile-margin: 0%;
	}
}
#board {
	display: grid;
	grid-template-rows: repeat(15, 1fr);
}
.board-row {
	display: grid;
	grid-template-columns: repeat(15, 1fr);
	grid-auto-flow: column;
}
.board-square {
	margin: 1px;
	background-color: var(--square-color);
	line-height: 1;
	position: relative;
}
.board-square.double-letter {
	background-color: var(--double-letter-color);
}
.board-square.triple-letter {
	background-color: var(--triple-letter-color);
}
.board-square.double-word {
	background-color: var(--double-word-color);
}
.board-square.triple-word {
	background-color: var(--triple-word-color);
}
.tile {
	background-color: var(--tile-color);
	position: absolute;
	width: calc(100% - 2 * var(--tile-margin));
	height: calc(100% - 2 * var(--tile-margin));
	top: var(--tile-margin);
	left: var(--tile-margin);
	border-radius: 3px;
	display: flex;
	justify-content: center;
	align-items: center;
	font-weight: bold;
}
.blank {
	font-weight: normal;
}
.highlight {
	border: 0.5vmin solid var(--hl-border-color);
	width: 100%;
	height: 100%;
	box-sizing: border-box;
	position: absolute;
	cursor: pointer;
	display: flex;
	justify-content: center;
	align-items: center;
}
input[name=color-mode] {
	margin-left: 0.5em;
}
.highlight.nothing {
	border-color: var(--hl-nothing-color);
}
#board .highlight.selected {
	border-color: var(--hl-selected-color);
}
.highlight.all-correct {
	border-color: var(--hl-all-correct-color);
}
.highlight.some-mistakes {
	border-color: var(--hl-some-mistakes-color);
}
.possibilities {
	word-break: break-all;
}
.point-container {
	position: relative;
	width: 100%;
	height: 100%;
}
.point-value {
	position: absolute;
	bottom: calc(1% + var(--tile-margin));
	right: calc(1% + var(--tile-margin));
	text-align: center;
	font-size: 30%;
}
#select-container {
	width: 100%;
}
.select-tile-container {
	cursor: pointer;
}
.select-tile-container .tile {
	position: static;
	display: inline-flex;
	background-color: transparent;
	font-weight: normal;
	box-sizing: border-box;
	border: min(0.7mm, 0.3vmin) solid var(--select-tile-border-color);
	width: min(1.5cm,10vmin);
	height: min(1.5cm,10vmin);
	font-size: min(1.2cm,8vmin);
	margin: 2px;
}
.select-tile-container .tile.possible,
.select-tile-container .tile.correct {
	background-color: var(--select-tile-possible-color);
}

.select-tile-container .tile.possible,
.select-tile-container .tile.correct,
.select-tile-container .tile.wrong,
.select-tile-container .tile.placing {
	border-width: min(1.5mm, 0.6vmin);
	font-weight: bold;
}
.select-tile-container .tile.missed {
	background-color: var(--select-tile-possible-color);
}
.select-tile-container .tile.not-possible {
	background-color: var(--select-tile-not-possible-color);
}
.select-tile-container .tile.wrong {
	background-color: var(--select-tile-not-possible-color);
}
.select-tile-container .tile.placing {
	background-color: var(--select-tile-placing-color);
}
#submit {
	outline: 0;
	border: 2px solid var(--submit-border-color);
	outline: 2px solid var(--submit-outline-color);
	box-shadow: 2px 2px 4px var(--submit-outline-color);
	margin-bottom: 1.5em;
	border-radius: 5px;
	padding: 4px 8px;
	background: var(--submit-background-color);
}
#submit:hover {
	background: var(--submit-hover-color);
}
#submit:active {
	transform: translate(2px, 2px);
	box-shadow: 0 0 0;
}
.solution-letter.wrong {
	text-decoration: line-through;
	font-weight: bold;
	color: var(--solution-letter-wrong-color);
}
.solution-letter.correct {
	color: var(--solution-letter-correct-color);
}
.solution-letter.missed {
	color: var(--solution-letter-missed-color);
	font-weight: bold;
}
/* all browsers which support grid should support
   the JavaScript we use (if they have javascript at all). */
@supports(display: grid) {
	#no-grid {
		display: none;
	}
}
progress#score-meter::-moz-progress-bar { background: var(--score-color); }
progress#score-meter::-webkit-progress-value { background: var(--score-color); }
progress#score-meter { color: var(--score-color); }
#score-ratio {
	color: var(--score-color);
	font-weight: bold;
}
h2, h3 {
	margin: 2px;
}
.links {
	text-align: right;
	margin: 0;
	line-height: 1;
}
dialog {
	max-width: min(50em,80%);
	/* weirdness for the sake of old browsers (with no <dialog>) */
	display: none;
}
dialog[open] {
	display: block;
}
textarea {
	max-width: 90%;
}
#past-container {
	margin: 1em 0;
}
ul {
	margin: 2px;
}