.btn {
  display: inline-flex;
  align-items: center;
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}

.btn__label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 2.25rem;
  border-radius: 999px;
  background: var(--color-accent);
  color: var(--color-bg-header);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1;
  white-space: nowrap;
}

.btn__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 0;
  height: 3rem;
  margin-left: 0;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-bg-header);
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
  transition:
    width 0.3s ease,
    margin-left 0.3s ease,
    opacity 0.25s ease;
}

.btn__icon .bi {
  font-size: 1.1rem;
  line-height: 1;
}

.btn:hover .btn__icon,
.btn:focus-visible .btn__icon {
  width: 3rem;
  margin-left: 0.5rem;
  opacity: 1;
}

.btn:focus-visible .btn__label {
  outline: 2px solid var(--color-bg-header);
  outline-offset: 3px;
}

.btn--icon-visible .btn__icon {
  width: 3rem;
  margin-left: 0.5rem;
  opacity: 1;
  pointer-events: auto;
}

.btn--blue .btn__label,
.btn--blue .btn__icon {
  background: var(--color-bg-header);
  color: var(--color-text);
}

.btn--blue:focus-visible .btn__label {
  outline-color: var(--color-text);
}