@keyframes spin {
	from {transform: rotate(0)}
	to {transform: rotate(1turn)}
}

.a11y-outline-target {
	outline: 5px solid #26c !important;
}

#a11y-outline,
#a11y-outline * {
	all: revert;
}

#a11y-outline [hidden] {
	display: none !important;
}

#a11y-outline {
	--color-border: rgba(0,0,0,0.2);
	--color-focus: #26c;
	--color-tint: rgba(0,0,0,0.1);

	font-size: initial;
	line-height: 1.4;
	text-align: start;
	max-width: 40em;
	border: 1px solid var(--color-border);
	border-radius: 0.3em;
	box-shadow: 0 0 0.5em rgba(0,0,0,0.3);
	accent-color: var(--color-focus);
}

#a11y-outline header {
	display: flex;
	gap: 0.5em;
	margin: 0 0 1em;
}

#a11y-outline .close,
#a11y-outline select,
#a11y-outline .treeview button {
	font-size: inherit;
	line-height: 1.2;
	color: inherit;
	padding: 0.5em;
	background-color: var(--color-tint);
	border: 1px solid var(--color-border);
	border-radius: 0;
}

#a11y-outline .close {
	box-sizing: content-box;
	min-width: 1.2em;
	text-align: center;
}

#a11y-outline select {
	flex-grow: 1;
}

#a11y-outline ul {
	margin: 0;
	padding-left: 1.5em;
	list-style: initial;
}

#a11y-outline .treeview {
	outline: 0;
}

#a11y-outline .treeview:empty {
	box-sizing: border-box;
	width: 2em;
	height: 2em;
	margin: 0 auto;
	border: 3px solid;
	border-top-color: transparent;
	border-radius: 50%;
	animation: spin 2s infinite linear;
}

#a11y-outline .treeview [aria-expanded=false] ul {
	display: none;
}

#a11y-outline .treeview [aria-expanded] {
  list-style: none;
}

/* link */
#a11y-outline .treeview a {
	color: inherit;
	text-decoration: none;
}
#a11y-outline .treeview [aria-selected=true] > a {
	outline: 1px dotted;
}
#a11y-outline .treeview:focus [aria-selected=true] > a {
	color: var(--color-focus);
}

/* toggle */
#a11y-outline .treeview [role=treeitem] {
	position: relative;
}

#a11y-outline .treeview button {
	box-sizing: content-box;
	height: auto;

	/* reset */
	min-height: 0;
	position: absolute;

	/* layout */
	left: -1.3em;
	top: 0.3em;
	padding: 0;
	min-width: 0.8em;
	line-height: 0.8;

	text-align: center;
}
#a11y-outline .treeview button::after {
	content: "+";
}
#a11y-outline .treeview [aria-expanded=true] > button::after {
	content: "−";
}

@media (prefers-color-scheme: dark) {
	#a11y-outline {
		--color-border: rgba(255,255,255,0.2);
		--color-focus: #3ae;
		--color-tint: rgba(255,255,255,0.1);
		color-scheme: dark;
	}
	.a11y-outline-target {
		outline-color: #3ae !important;
	}
}