/* reset bibliography counter */
#refs {
  counter-reset: ref-item;
}

/* increment counter and emulate list indentation */
#refs .csl-entry {
  counter-increment: ref-item;
  position: relative;
  padding-left: 2.75rem;
}

/* render bracketed reference number */
#refs .csl-entry::before {
  content: "[" counter(ref-item) "] ";
  position: absolute;
  left: 0;
  width: 2.25rem;
  text-align: right;
}