:root,
html[data-theme="dark"] {
	--bg: #1f252d;
	--panel: #27303a;
	--menu: #2b3541;
	--menu-2: #222b35;
	--text: #e8edf3;
	--muted: #b7c1cc;
	--border: #3a4654;
	--hover: #344152;
	--active: #3f5166;
	--canvas-border: #0f141a;
	--shadow: rgba(0, 0, 0, 0.35);
}

html[data-theme="light"] {
	--bg: #f2f5f9;
	--panel: #ffffff;
	--menu: #e8edf3;
	--menu-2: #dde5ee;
	--text: #1b2530;
	--muted: #4b5a6b;
	--border: #c8d3df;
	--hover: #dce6f2;
	--active: #cedced;
	--canvas-border: #aebdcd;
	--shadow: rgba(0, 0, 0, 0.12);
}

* {
	box-sizing: border-box;
}

html,
body {
	margin: 0;
	padding: 0;
}

body {
	background: var(--bg);
	color: var(--text);
	font-family: "Segoe UI", Tahoma, Arial, sans-serif;
	font-size: 1rem;
}

.container {
	width: min(1280px, 95%);
	margin: 0 auto;
}

.topbar {
	background: linear-gradient(90deg, var(--menu), var(--menu-2));
	border-top: 1px solid #44526433;
	border-bottom: 1px solid #12171d33;
	position: sticky;
	top: 0;
	z-index: 20;
}

.topbar-row {
	min-height: 56px;
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
}

.topnav {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
}

.nav-link {
	color: var(--text);
	text-decoration: none;
	padding: 1rem 1.1rem;
	border-left: 1px solid rgba(255, 255, 255, .08);
	border-right: 1px solid rgba(0, 0, 0, .2);
	font-weight: 600;
}

.nav-link:hover {
	background: var(--hover);
}

.nav-link.active {
	background: var(--active);
	color: #fff;
}

.theme-toggle {
	border: 1px solid var(--border);
	background: var(--panel);
	color: var(--text);
	border-radius: 8px;
	padding: .45rem .8rem;
	font-weight: 600;
	cursor: pointer;
}

.theme-toggle:hover {
	background: var(--hover);
}

.page-content {
	padding: 1.5rem 0 2rem;
	display: grid;
	gap: 1rem;
}

.page-panel {
	background: var(--panel);
	border: 1px solid var(--border);
	border-radius: 10px;
	padding: 1.25rem;
	box-shadow: 0 8px 22px var(--shadow);
}

h1,
h2,
h3 {
	text-align: center;
	margin-top: 0;
}

h2,
h3,
p,
li {
	color: var(--muted);
}

.canvas-wrap {
	overflow-x: auto;
}

canvas {
	border: 2px solid var(--canvas-border);
	display: block;
	margin: 0 auto;
	border-radius: 8px;
	max-width: 100%;
	height: auto;
	background: #000;
}

.accordion {
	margin: 0.5% 0;
	width: 100%;
	background: var(--menu);
	color: var(--text);
	cursor: pointer;
	padding: 14px 16px;
	outline: none;
	font-size: 1.1rem;
	font-weight: 700;
	text-align: center;
	border: 1px solid var(--border);
	border-radius: 8px;
	transition: .2s ease;
}

.accordion:hover,
.accordion.active {
	background: var(--hover);
}

.panel {
	padding: 14px;
	margin: 8px 0 12px;
	display: none;
	background: color-mix(in srgb, var(--panel) 85%, #000 15%);
	border: 1px solid var(--border);
	border-radius: 8px;
}

.panel ul {
	width: min(780px, 95%);
	margin: 0 auto;
	line-height: 1.45;
}

.backtotop {
	border-top: 1px solid var(--border);
	margin-top: 10px;
	padding-top: 10px;
	text-align: center;
}

.backtotop a {
	color: var(--text);
	text-decoration: none;
}

.backtotop a:hover {
	text-decoration: underline;
}

@media (max-width: 900px) {
	.topbar-row {
		flex-direction: column;
		align-items: stretch;
		padding: .35rem 0;
	}

	.topnav {
		justify-content: center;
	}

	.theme-toggle {
		align-self: center;
		margin-bottom: .35rem;
	}
}