:root {
	--text: white;

	--correct: limegreen;
	--correct-shadow: green;

	--fail: crimson;
	--fail-shadow: red;

	--hover: gray;
	--selection: goldenrod;
	--selection-shadow: gold;
}

html {
	font-size: 62.5%;
	scroll-behavior: smooth;
}

body {
	background-color: #0f1116;
	color: var(--text);
	font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
	margin: 0px;
	overflow-x: hidden;
}

#counter {
	margin: 10px;
	font-size: 20px;

	> div {
		display: inline-block;

		&.correct {
			color: var(--correct);
			text-shadow: var(--correct-shadow) 0px 0px 30px;
		}

		&.wrong {
			color: var(--fail);
			text-shadow: var(--fail-shadow) 0px 0px 30px;
		}

		&:not(:last-child)::after {
			color: var(--text);
			content: "/";
		}
	}
}

#result {
	display: none;
	position: absolute;
	top: 40%;
	left: 50%;
	transform: translate(-50%, -50%);
	justify-content: center;
	align-items: center;
	user-select: none;
	opacity: 0;
	cursor: default;

	&.visible {
		display: flex;
		animation: 200ms fade-in forwards;
	}

	> div {
		position: relative;
		text-align: center;
		font-size: 40vw;

		&.correct {
			color: var(--correct);
			text-shadow: var(--correct-shadow) 0px 0px 30px;
		}

		&.wrong {
			color: var(--fail);
			text-shadow: var(--fail-shadow) 0px 0px 30px;
		}
	}
}

@keyframes fade-in {
	0% {
		opacity: 0;
		display: none;
	}
	100% {
		opacity: 1;
		display: block;
	}
}

form {
	width: 100%;
	text-align: center;
	display: flex;
	flex-direction: column;
	font-size: 24px;
	user-select: none;

	h1 {
		font-size: 3vw;
		text-wrap: balance;

		&.correct {
			color: var(--correct);
			text-shadow: var(--correct-shadow) 0px 0px 30px;
		}

		&.wrong {
			color: var(--fail);
			text-shadow: var(--fail-shadow) 0px 0px 30px;
		}
	}

	> div {
		width: 100%;
		height: 80px;
		display: flex;
		margin-top: 10px;
		align-items: center;
		align-self: center;
		box-sizing: border-box;
		border: solid 2px unset;
		text-wrap: balance;

		&.selected {
			border: solid 2px var(--selection);
			box-shadow: 0px 0px 13px -5px var(--selection-shadow);
		}

		> input[type="checkbox"] {
			display: none;
			scale: 1.5;
			margin-right: 10px;
		}

		> label {
			flex-grow: 1;
		}
	}

	> input[type="submit"] {
		margin-top: 40px;
		height: 70px;
		background-color: transparent;
		border: none;
		color: white;
		font-size: 42px;

		&:focus {
			outline: none;
		}
	}
}

@media only screen and (max-width: 540px) {
	form {
		h1 {
			font-size: 5vw;
		}
	}

	#result > div {
		font-size: 70vw;
	}
}

@media (hover: hover) {
	form {
		> input[type="submit"]:hover {
			font-size: 48px;
			color: var(--selection);
			cursor: pointer;
		}

		> div {
			&:hover:not(.selected) {
				border: solid 1px var(--hover);
			}

			&:hover,
			> *:hover {
				cursor: pointer;
			}
		}
	}
}