Underline Grow

<!-- Underline Grow — underline grows on hover/focus -->
<a href="#" class="nuda-underline-grow">Hover me</a>

/* ── Underline Grow ──────────────────────────────────────────
   Underline scales in from the left on hover/focus.
   Customize:
     --nuda-ug-clr    : underline color
     --nuda-ug-thick  : underline thickness
     --nuda-ug-speed  : grow duration
   ──────────────────────────────────────────────────────────── */
.nuda-underline-grow {
  --nuda-ug-clr: #e4ff54;
  --nuda-ug-thick: 2px;
  --nuda-ug-speed: 0.32s;

  position: relative;
  display: inline-block;
  font-size: 1.6rem;
  font-weight: 700;
  color: #fafafa;
  text-decoration: none;
  cursor: pointer;
}

.nuda-underline-grow::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: var(--nuda-ug-thick);
  background: var(--nuda-ug-clr);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--nuda-ug-speed) cubic-bezier(0.22, 1, 0.36, 1);
}

.nuda-underline-grow:hover::after,
.nuda-underline-grow:focus-visible::after {
  transform: scaleX(1);
}

.nuda-underline-grow:focus-visible {
  outline: 2px solid var(--nuda-ug-clr);
  outline-offset: 4px;
}

/* ── Accessibility ──────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .nuda-underline-grow::after {
    transition: none;
  }
}