index-shop/assets/css/components/_btn--default.scss

.btn__default {
  --size: calc(var(--h-block) - 8px);
  font-size: var(--fs-normal);
  font-weight: var(--fw-normal);
  height: var(--size);
  padding-right: 1.5ch;

  position: relative;

  display: flex;
  align-items: center;
  gap: 0ch;
  // padding-right: 0.5ch;
  color: var(--color-accent);
  font-weight: var(--fw-medium);
  text-decoration: none;

  cursor: pointer;

  .icon,
  .txt {
    z-index: 10;
  }

  .icon {
    width: var(--size);
    height: var(--size);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-bg);
    text-align: center;

    svg {
      fill: var(--color-bg);
      width: 80%;
    }
  }

  .txt {
    font-family: var(--font-title);
    color: var(--color-accent);
    font-size: var(--fs-normal);
    font-weight: var(--fw-bold);
    padding-left: 1ch;
  }

  &::after {
    content: "";
    display: block;
    background-color: var(--color-accent);
    border-radius: calc(var(--size) / 2);
    width: var(--size);
    height: var(--size);
    position: absolute;
    left: 0;
    z-index: 0;
    transition: width 0.2s;
  }

  &:hover:not(:disabled) {
    //
    .txt {
      color: var(--color-bg);
      display: block;
    }
    &::after {
      width: 100%;
    }
  }

  &:disabled {
    cursor: not-allowed;
    opacity: 0.6;
  }
}