/* A quiet row under a reference: Crossref, Google Scholar. Plain text links in the reference's own colour, softened, with a thin underline;
   they come to full strength on hover or keyboard focus. No boxes, so a long reference list stays calm. */
.ref_links {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 0.25rem 1.1rem;
	margin: 0.4rem 0 0;
	font-size: 0.8rem;
	line-height: 1.3;
}

.ref_links:empty {
	display: none;
}

.ref_links .ref_link {
	color: inherit;
	opacity: 0.62;
	text-decoration: none;
	border-bottom: 1px solid currentColor;
	padding-bottom: 1px;
	white-space: nowrap;
	transition: opacity 0.15s ease;
}

.ref_links .ref_link:hover,
.ref_links .ref_link:focus-visible {
	opacity: 1;
	text-decoration: none;
}

.ref_links .ref_link:focus-visible {
	outline: 2px solid currentColor;
	outline-offset: 3px;
}

@media print {
	.ref_links {
		display: none;
	}
}