// Colors
$grey-light: #f0f4f9;
$grey: darken($grey-light, 20%);
$blue: #1e90ff;
$orange: #ff5321;

// Defaults
$box-shadow: 0 15px 35px rgba(50, 50, 93, .1), 0 5px 15px rgba(0, 0, 0, .07);
$border-radius: .3em;

@keyframes expand {
  0%    {opacity: 0; max-height: 0; }
  100%  {opacity: 1; max-height: 30em; }
}

// Basic setup
html {
	overflow-y: scroll;
}

body {
	position: relative;
	background: #f0f4f9;
	line-height: 1.6;
	font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
}

main {
	display: block; /* IE */
	width: 70%; max-width: 50em;
	margin: 3em auto;
}

p { 
	margin: 0;
}

p + p { 
	margin-top: 1.5em;
}

a { 
	color: $blue;
}

details > div {
	position: relative;
	z-index: 20;
	padding: 1.25em 1.5em;
	margin-bottom: .6em;
	border-radius: $border-radius;
	box-shadow: $box-shadow;
	background-color: white;
	// animation: expand .2s ease-in-out;
}

// Details & Summary
summary {
	position: relative;
	z-index: 10;
	display: block;
	background: white;
	padding-left: 3em;
	margin-bottom: .5em;
	font-size: 1.2em;
	line-height: 3;
	box-sizing: border-box; 
	list-style: none;
	cursor: pointer;
	border-radius: $border-radius;
	box-shadow: $box-shadow;
}

summary:hover,
summary:focus {
	background: $blue;
	color: white;
	text-shadow: 0 -1px 0 rgba(black, .5);
	outline: 0;
}

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

summary::before {
	content: '+';
	position: absolute;
	top: 50%; 
	left: 1em;
	transform: translateY(-50%);
	width: 1em; 
	height: 1em;
	margin-right: 1em;
	background: $orange;
	color: white;
	font-family: Arial, sans-serif;
	font-size: 20px;
	line-height: 1;
	text-align: center;
	border-radius: 50%;	
}

details[open] summary::before {
	content: '-';
	line-height: .9;
}

details[open] summary:hover::before,
details[open] summary:focus::before {
	background: white;
	color: $blue;
}