:root {
	--button-size: 2em;

	font-family: sans-serif;
	font-size: 5mm;
}

.editor {
	display: block;
	position: relative;
}

.editor .outline {
	display: block;
	position: relative;
	width: calc(100% - var(--button-size));
}

.editor .outline [tabindex] {
	position: relative;
}
.editor .outline div [tabindex] {
	margin-left: 2em;
}
.editor .outline [tabindex]>span,
.editor .outline [tabindex]>textarea {
	--padding: 0.2em;

	display: block;
	width: 100%;
	/* XXX this is a tiny bit off and using textarea's height here is off too... */
	min-height: 1em;
	padding: var(--padding);
	margin: 0;

	font-family: sans-serif;
	font-size: 5mm;
	white-space: pre;

	outline: none;
	border: none;
}
.editor .outline [tabindex]>textarea {
	height: calc(2 * var(--padding) + 1em);
	overflow: hidden;
	resize: none;
}

/* show/hide node's view/code... */
.editor .outline [tabindex]>span+textarea:not(:focus),
/* XXX not sure how to do this without :has(..)... */
.editor .outline [tabindex]:has(>span+textarea:focus)>span:has(+textarea),
.editor .outline [tabindex]:focus>span+textarea {
	position: absolute;
	opacity: 0;
	top: 0;
}

/* focus... */
.editor .outline [tabindex]:focus {
	/*outline: solid 0.2em silver;*/
	outline: none;
}
.editor .outline [tabindex]:focus>span,
.editor .outline [tabindex]:focus>textarea {
	background: rgba(0,0,0,0.1);
}
.editor .outline [tabindex].focused:not(:focus)>span,
.editor .outline [tabindex].focused:not(:focus)>textarea {
	background: rgba(0,0,0,0.05);
}


.editor .outline div[collapsed] {
	border-bottom: solid 1px silver;
}
.editor .outline div[collapsed] div {
	display: none;
}

/* XXX are we selecting subtrees or blocks??? */
.editor .outline [selected] {
	background: silver;
}


.editor .toolbar {
	display: inline-block;
	position: absolute; 
	top: 1em;
	right: 1em;
}
.editor .toolbar button {
	display: block;

	width: var(--button-size);
	height: var(--button-size);

	font-size: var(--button-size);
}