three.js/devtools/panel/panel.css

:root {
	color-scheme: light dark;
}

body {
	background: light-dark( #fff, #333 );
	color: light-dark( #333, #e0e0e0 );
	margin: 0;
	padding: 10px;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
	font-size: 12px;
}

hr {
	color: light-dark( #333, #e0e0e0 );
}

#scene-tree {
	width: 100%;
	height: 100%;
	overflow: auto;
}

.info-item {
	padding: 8px 12px;
	background: light-dark( #f5f5f5, #333 );
	border-radius: 4px;
	margin-bottom: 16px;
	font-family: monospace;
	color: light-dark( #666, #aaa );
}
.section {
	margin-bottom: 24px;
}
.section h3 {
	margin: 0 0 8px 0;
	font-size: 11px;
	text-transform: uppercase;
	color: light-dark( #666, #aaa );
	font-weight: 500;
	border-bottom: 1px solid light-dark( #eee, #444 );
	padding-bottom: 4px;
}

.tree-item {
	padding: 4px;
	cursor: pointer;
	display: flex;
	align-items: center;
}
.tree-item:hover {
	background: light-dark( #f0f0f0, #555 );
}
.tree-item .icon {
	margin-right: 4px;
	opacity: 0.7;
}
.tree-item .label {
	flex: 1;
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}
.tree-item .label .object-details {
	color: #aaa;
	margin-left: 4px;
	font-weight: normal;
}
.tree-item .type {
	margin-left: 8px;
	opacity: 0.5;
	font-size: 0.9em;
}

.children {
	margin-left: 0;
}

/* Style for clickable renderer summary */
.renderer-summary {
	cursor: pointer;
}
.renderer-summary:hover {
	background: light-dark( #f0f0f0, #555 );
}

/* Hide default details marker when using custom summary */
details.renderer-container > summary.renderer-summary { /* Target summary */
	list-style: none; /* Hide default arrow */
	cursor: pointer; /* Make the summary div look clickable */
}
details.renderer-container > summary.renderer-summary::-webkit-details-marker {
	display: none; /* Hide default arrow in WebKit */
}

/* Style for the toggle icon */
.toggle-icon::before {
	content: '▶'; /* Default: collapsed */
	display: inline-block;
	width: 1em;
	margin-right: 2px;
	opacity: 0.7;
}
details.renderer-container[open] > summary.renderer-summary .toggle-icon::before {
	content: '▼'; /* Expanded */
}