:root {
	--header_height: 56px;
	--aside_width: 150px;
	--footer_height: 24px;
}
html,
body {
	background-color: #eee;
	color: #333;
	font-size: 16px;
	line-height: 1.5;
	font-family: 'Arial', 'Meiryo', 'Helvetica', 'Hiragino Kaku Gothic ProN', sans-serif;
}
body {
	display: flex;
	flex-direction: column;
	min-height: 100vh;
}
span {
	display: inline-block;
}
img {
	max-width: 100%;
	height: auto;
	vertical-align: text-bottom;
}
iframe {
	max-width: 100%;
}
#header h1 {
	padding: 1rem;
	color: #fff;
	background-color: navy;
}

#hamburger {
	/* position: fixed; */
	position: absolute;
	top: 0;
	right: 0;
	display: block;
	padding: 1.5rem 1rem .25rem;
	background-color: navy;
}
#hamburger .line {
	position: relative;
	display: block;
	width: 100%;
	height: .5px;
	background-color: #fff;
}
#hamburger.on .line {
	background-color: transparent;
}
#hamburger .line::before,
#hamburger .line::after {
	content: '';
	width: 100%;
	height: .5px;
	background-color: #fff;
	transition: transform .2s;
}
#hamburger .line::before {
	position: absolute;
	top: -10px;
}
#hamburger .line::after {
	position: absolute;
	top: 10px;
}
#hamburger.on .line::before {
	top: 0;
	transform: rotate(-45deg);
}
#hamburger.on .line::after {
	top: 0;
	transform: rotate(45deg);
}
#hamburger .text {
	display: block;
	margin-top: 12px;
	color: #fff;
	font-size: 10px;
	text-align: center;
}
@media screen and (min-width: 768px) {
	#hamburger {
		display: none;
	}
}

#nav {
	position: fixed;
	top: var(--header_height);
	left: -100vw;
	/* left: 0; */
	background-color: #505050;
	color: #fff;
	width: 100vw;
	height: calc(100vh - var(--header_height) - var(--footer_height));
	padding: 1rem 0;
	opacity: 0;
	visibility: hidden;
	overflow-y: auto;
	transition: left .2s, opacity .2s, visibility .2s;
	z-index: 100;
}
#nav.on {
	opacity: 1;
	visibility: visible;
	left: 0;
	z-index: 1000;
}
#nav .list {
	padding: 0 1rem;
}
#nav .list li a {
	display: block;
	padding: 1rem .5rem;
}
#nav .list li a:hover {
	font-weight: bold;
}
#nav .list li a.on {
	background-color: #eee;
	color: #333;
}
@media screen and (min-width: 768px) {
	#nav {
		position: relative;
		top: 0;
		left: 0;
		width: 100%;
		/* height: auto; */
		opacity: 1;
		visibility: visible;
		transition: none;
		padding: 0;
	}
	#nav .list {
		padding: 0 0 0 .5rem;
	}
	#nav .list li {
		/* flex: 1 1 auto; */
		width: 100%;
		margin: .5rem 0;	
	}
	#nav .list li a {
		position: relative;
		line-height: 1;
		transition: transform .2s;
	}
	#nav .list li a::before {
		content: '';
	}
}
.main_wrap {
	display: flex;
}
#main {
	width: 100%;
	height: calc(100vh - var(--header_height) - var(--footer_height));
	margin: 0 auto;
	padding: 1rem 1rem 3.25rem;
	overflow-y: auto;
}
#main h1 {
	padding: .5rem;
	font-size: 18px;
	background-color: mediumblue;
	color: #fff;
	margin-bottom: .5rem;
}
@media screen and (min-width: 768px) {
	#aside {
		width: var(--aside_width);
	}
	#main {
		width: calc(100% - var(--aside_width));
	}
}
#footer {
	text-align: right;
	background-color: navy;
	color: #fff;
}