body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    background-color: #f8f9fa; color: #343a40; line-height: 1.6;
}
.container {
    display: flex;
    max-width: 1100px;
    margin: 20px auto;
    padding: 0 15px;
}
header {
    background-color: #343a40;
    color: white;
    padding: 1rem 2rem;
	h1 {
		margin: 0;
		font-size: 1.8rem;
		a {
			color: white;
			text-decoration: none;
		}
	}
}
nav {
    margin-top: 0.5rem;
	a {
		color: #f8f9fa;
		text-decoration: none;
		margin-right: 1.5rem;
		font-size: 1.1rem;
		transition: color 0.2s;
	}
	a:hover {
		color: #0d6efd;
	}
}
main {
    flex: 3;
    margin-right: 20px;
}
aside {
    flex: 1;
}
.card {
    background-color: white;
    border: 1px solid #dee2e6;
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
	h2, h3 {
		margin-top: 0;
	}
	h3 a {
		text-decoration: none;
		color: #0d6efd;
	}
}
.item-meta {
    font-size: 0.9rem;
    color: #6c757d;
    margin-bottom: 0.5rem;
}
.tag-link {
    display: inline-block;
    background-color: #e9ecef;
    color: #495057;
    padding: 0.2rem 0.6rem;
    margin: 0.2rem;
    border-radius: 0.3rem;
    text-decoration: none;
    font-size: 0.9rem;
}
.tag-link:hover {
    background-color: #0d6efd;
    color: white;
}


.taglist {
	list-style: none;
	display: flex;
	flex-wrap: wrap;
	a {
        text-decoration: none;
        color: black;
        li {
			font-family: toppan-bunkyu-midashi-go-std, sans-serif;
			font-style: normal;
			font-weight: 600;
			margin: 0 8px 0 0;
			padding: 5px 10px 5px 10px;
			display: inline-block;
			background-color: rgb(220, 234, 246);
			border: 0.5px solid rgb(186, 186, 186);
			border-radius: 4px;
        }
	}
	a:hover {
		color: rgb(251, 251, 251);
		li {
			background-color: rgb(25, 94, 155);
			border: 0.5px solid rgb(31, 31, 31);
		}
	}
}

.toc {
	width: 50%;
	background: #e9ecef;
	padding: 20px 25px;
	margin: 5px auto 20px;
	border-radius: 5px;
	border-left: 5px solid #007bff;
	h2 {
		margin-top: 0;
		border-bottom: none;
		padding-bottom: 10px;
		color: #343a40;
		font-size: 1.5em;
	}
	ul {
		list-style: none;
		padding: 0;
		margin: 0;
		
		grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
		gap: 10px;
	}
	li a {
		text-decoration: none;
		color: #0056b3;
		display: block;
		padding: 8px 12px;
		border-radius: 4px;
		transition: background-color 0.2s ease, color 0.2s ease;
	}
	li a:hover {
		background-color: #007bff;
		color: #fff;
	}
}

.image {
	margin: 20px auto 20px;
	height: 250px;
	width: 80%;
	background-color: rgb(217, 228, 228);
	border: 0.5px solid rgb(161, 171, 175);
	border-radius: 10px;
	text-align: center;
	line-height: 250px;
	img {
		vertical-align: middle;
		height: 90%;
	}
}

.article_header {
	margin: 5px 0 30px 0;
	padding: 2px;
	text-align: left;
	
	h1 {
		font-size: 2.5rem;
		margin: 0 0 0 20px;
	}
	.item-meta{
		text-align: right;
		border-bottom: 1px solid rgb(91, 93, 95);
	}
	ul {
		margin: 5px;
		padding: 0;
	}
}
.article-content{
	padding: 10px;
	margin-top: 1rem;
	font-size: 1.1rem;
	section {
		margin-bottom: 30px;
		h2 {
			margin-bottom: 0px;
			padding-left: 0.5em;
			border-bottom: 1px solid rgb(91, 93, 95);
		}
		div {
			padding: 8px;
		}
		.ul_r {
			margin: 20px auto 20px;
			padding: 20px;
			width: 80%;
			background-color: rgb(237, 241, 241);
			border: 0.5px solid rgb(204, 208, 209);
			border-radius: 10px;
			text-align: center;
			list-style-type: none;
			li{
				display:inline;
				padding: 20px;
			}
		}
		ul {
			margin: 20px auto 20px;
			padding: 20px;
			width: 80%;
			background-color: rgb(237, 241, 241);
			border: 0.5px solid rgb(204, 208, 209);
			border-radius: 10px;
			text-align: center;
			list-style-type: none;
			li{
				padding-top: 20px;
				padding-bottom: 20px;
			}
		} 
	}
}

.reference a {
	text-decoration: none;
}

footer {
    text-align: center;
    padding: 2rem;
    margin-top: 2rem;
    background-color: #e9ecef;
	.snstitle {
		font-size: 40px;
	}
	.sns {
		width: 40%;
		display: flex;
		margin: 10px auto 30px;
		text-align: center;
		a {
			display: block;
			margin: auto;
		}
		img {
			height: 50px;
		}
	}
	.links {
		width: 60%;
		display: grid;
		margin: 10px auto 30px;
		text-align: center;
		display: flex;
		p {
			margin: auto;
		}
		a {
			text-decoration: none;
			color: #1f3175;
		}
	}
}