:root {
	--card: 0 1px 4px rgba(0, 0, 0, 0.2), 0 1px 2px rgba(0, 0, 0, 0.3);
	--main-clr: hsl(289, 85%, 34%);
	--border: 1.6px solid #ccc;
	--body-bgc: hsl(0, 0%, 98%);
	--header-bgc: white;
	--article-bgc: white;
	--quote-bgc: whitesmoke;
	--footer-bgc: whitesmoke;
	--kbd-bgc: whitesmoke;
	--tbl-border: hsl(0, 1%, 90%);
}

@media (prefers-color-scheme: dark) {
	:root {
		--card: 0 1px 4px rgba(200, 200, 200, 0.2), 0 1px 2px rgba(200, 200, 200, 0.3);
		--txt-clr: rgb(248, 248, 248);
		--border: 1.6px solid rgb(162, 162, 162);
		--body-bgc: rgb(20, 20, 20);
		--header-bgc: rgb(28, 28, 28);
		--article-bgc: rgb(32, 32, 32);
		--quote-bgc: rgb(54, 54, 54);
		--footer-bgc: rgb(54, 54, 54);
		--kbd-bgc: rgb(54, 54, 54);
		--bulb-icon: url("/light.svg");
		--dialog-bgc: rgb(60, 60, 60);
		--tbl-border: hsl(0, 0%, 28%);
	}
}

* {
	box-sizing: border-box;
}

*::-webkit-scrollbar {
	background-color: rgba(0, 0, 0, 0.01);
	width: 2px;
	height: 3px;
}

html {
	height: 100%;
	scroll-behavior: smooth;
}

body {
	font-family: BlinkMacSystemFont, Segoe UI, Roboto, Ubuntu, Helvetica, Arial, sans-serif;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	text-size-adjust: 100%;
	margin: 0;
	height: 100%;
	background-color: var(--body-bgc);
	color: var(--txt-clr);
	text-rendering: optimizeSpeed;
}

a {
	text-decoration: none;
	color: hsl(211, 100%, 50%);
}

button {
	box-shadow: var(--card);
	padding: 0.8em;
	background-color: var(--main-clr);
	color: white;
	border-radius: 8px;
	border: none;
	font-weight: bold;

	& a {
		color: white;
	}
}

.center {
	text-align: center;
}
 main {
	& h1 {
		font-size: 1.6rem;
	}

	& h3 {
		font-size: 1.4rem;
	}

	& p,
	& ol,
	& ul {
		font-size: 1.2rem;
		line-height: 1.5;
	}

	& img {
		max-width: 100%;
	}

	& kbd,
	& code {
		font-weight: bold;
		font-size: 0.9rem;
		background-color: var(--kbd-bgc);
		box-shadow: 1px 1px 1px 1px rgb(0 0 0 /0.2);
		padding: 2px 4px;
	}
}

blockquote {
	background-color: var(--quote-bgc);
	border-left: 10px solid #ccc;
	padding: 0.4em 1rem;
}

table {
	border-collapse: collapse;
	width: 100%;
	margin-top: 1em;

	& td,
	& th {
		border: 1px solid var(--tbl-border);
		text-align: left;
		padding: 8px;
	}

	& tr:nth-child(even) {
		background-color: var(--tbl-border);
	}
}

video {
	height: 370px;
	box-shadow: var(--card);
	border-radius: 3px;
}
 
		body {
			--header-hgt: 3.3rem;
		}

		main {
			--nav-min-width: 14em;
			--nav-max-width: 1fr;
			--toc-min-width: 5em;
			--article-max-width: 49em;

			display: grid;
			grid-template-columns:
				minmax(var(--nav-min-width), var(--nav-max-width)) minmax(0, var(--article-max-width))
				1fr;
		}

		article {
			box-shadow: var(--card);
			border-radius: 2px;
			background-color: var(--article-bgc);
			height: calc(100vh - var(--header-hgt) - 2px);
			overflow-y: auto;
			padding: 1em;
			margin-top: 2px;
		}

		header h1 {
			font-size: 2rem;
			text-align: center;
		}
	 
	.top-header {
		padding: 1rem 2rem;
		height: var(--header-hgt);
		position: sticky;
		top: 0;
		z-index: 4;
		background-color: var(--header-bgc);
		box-shadow: var(--card);
		color: var(--txt-clr);
		display: flex;
		align-items: center;
		justify-content: space-between;

		& .logo-txt {
			width: 10em;
			font-weight: bold;
			font-size: 1.2em;
			color: var(--txt-clr);

			& span {
				margin-left: 5px;
				vertical-align: middle;
			}

			& img {
				vertical-align: middle;
			}
		}
	}
 
	nav {
		position: sticky;
		top: 0;
		height: calc(100vh - var(--header-hgt));
		overflow-y: auto;
		margin-left: 6em;

		& h3 {
			text-align: center;
		}
	}
	.content-list {
		padding-left: 0;
		display: flex;
		flex-direction: column;
		row-gap: 0.5em;
		font-size: 1.1rem;
	}

	details {
		& summary {
			cursor: pointer;
		}

		& ol {
			padding-left: 0;
		}

		& li {
			margin-left: 2em;
			list-style-type: none;
		}
	}