:root {
	--primary-color: black;
	--secondary-color: white;
	--button-color: #ccc;
	--button-hover-color: #aaa;
	--button-disabled-color: #eee;
	--logo-color: black;

	font-family: sans-serif;
	text-align: center;
	line-height: 1.5;

	color: var(--primary-color);
	background-color: var(--secondary-color);
}

@media (prefers-color-scheme: dark) {
	:root {
		--primary-color: #eee;
		--secondary-color: #222;
		--button-color: #555;
		--button-hover-color: #444;
		--button-disabled-color: #333;
		--logo-color: white;
	}
}

.sr-only {
	position: absolute;
	left: -10000px;
	top: auto;
	width: 1px;
	height: 1px;
	overflow: hidden;
}

h1 {
	margin: 0;
	font-size: 2.5rem;
}

#timer {
	font-size: 3rem;
}

.exercises {
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: 2rem;
}

button {
	color: var(--primary-color);
	background-color: var(--button-color);

	font-size: 1.5rem;
	width: 12rem;
	height: 4rem;
	overflow: hidden;
	text-wrap: nowrap;
}

button:not([disabled]):hover {
	background-color: var(--button-hover-color);
}

button:disabled {
	color: var(--button-disabled-color);
}

.logos {
	display: flex;
	flex-flow: wrap row;
	flex-direction: row;
	justify-content: center;
	gap: 1.5rem;

	margin-top: 50px;
}

.logo {
	height: 1.5rem;
}

.logo * {
	fill: var(--logo-color);
}