*, *:after, *:before {
	box-sizing: border-box;
}

:root {
	font-size: 16px;
}

body {
	font-family: "Inter", sans-serif;
	line-height: 1.5;
	min-height: 100vh;
	font-size: 1.25rem;
}

*:focus {
	outline: none;
}

body > div {
	width: 90%;
	max-width: 600px;
	margin-left: auto;
	margin-right: auto;
	margin-top: 5rem;
	margin-bottom: 5rem;
}

details div {
	border-left: 2px solid #000;
	border-right: 2px solid #000;
	border-bottom: 2px solid #000;
	padding: 1.5em;
}

details div > * + * {
	margin-top: 1.5em;
}

details + details {
	margin-top: .5rem;
}

summary {
	list-style: none;
}

summary::-webkit-details-marker {
	display: none;
}

summary {
	border: 2px solid #000;
	padding: .75em 1em;
	cursor: pointer;
	position: relative;
	padding-left: calc(1.75rem + .75rem + .75rem);
}

summary:before {
	position: absolute;
	top: 50%;
	transform: translateY(-50%);
	left: .75rem;
	content: "↓";
	width: 1.75rem;
	height: 1.75rem;
	background-color: #000;
	color: #FFF;
	display: inline-flex;
	justify-content: center;
	align-items: center;
	flex-shrink: 0;
}

details[open] summary {
	background-color: #eee;
}

details[open] summary:before {
	content: "↑";
}

summary:hover {
	background-color: #eee;
}

a {
	color: inherit;
	font-weight: 600;
	text-decoration: none;
	box-shadow: 0 1px 0 0;
}

a:hover {
	box-shadow: 0 3px 0 0;
}