.site-back,
.site-back-inline::before {
  box-sizing: border-box;
  display: inline-grid;
  place-items: center;
  inline-size: 2.5rem;
  block-size: 2.5rem;
  border-radius: 50%;
  color: inherit;
  font: 400 1.35rem/1 system-ui, sans-serif;
  text-decoration: none;
  vertical-align: middle;
}

.site-back {
  flex: 0 0 2.5rem;
  margin-inline-end: clamp(.25rem, 1vw, .75rem);
}

.site-back-inline::before {
  content: "←";
  flex: 0 0 2.5rem;
  margin-inline-end: .25rem;
}

.research-nav .lab-wordmark.site-back-inline {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.research-nav .lab-wordmark.site-back-inline::before {
  inline-size: 1.25rem;
  block-size: 1.25rem;
  flex-basis: 1.25rem;
  margin-inline-end: .2rem;
  font-size: 1.1rem;
}

.site-back:hover,
.site-back-inline:hover::before {
  background: rgb(128 128 128 / 14%);
}

.site-back:focus-visible,
.site-back-inline:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

header > .site-back + .brand {
  margin-inline-end: auto;
}

@media (max-width: 480px) {
  .site-back,
  .site-back-inline::before {
    inline-size: 2.125rem;
    block-size: 2.125rem;
    font-size: 1.2rem;
  }

  .site-back,
  .site-back-inline::before {
    flex-basis: 2.125rem;
  }
}