@mixin progress-value {
  border: 1px solid var(--button-bg);
  background: repeating-linear-gradient(90deg, var(--selection-bg), var(--selection-bg) 6px, transparent 6px, transparent 8px);
}

@mixin progress-value-indeterminate {
  width: 32px;
  animation: 1s infinite linear indeterminate;
}

progress,
.progress-bar {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  background: var(--button-bg);
  border: 1px solid var(--dark);
  border-bottom: 1px solid var(--lightest);
  border-right: 1px solid var(--lightest);
  height: 13px;
}

.progress-bar {
  position: relative;
  overflow: hidden;

  &:not([aria-valuenow])::after,
  & > .progress-bar-value {
    content: '';
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    @include progress-value;
  }

  &:not([aria-valuenow])::after {
    @include progress-value-indeterminate;
  }
}

progress::-webkit-progress-bar {
  background: var(--button-bg);
}

progress::-webkit-progress-value {
  @include progress-value;
}

progress::-moz-progress-bar {
  @include progress-value;
}

progress:indeterminate::-moz-progress-bar {
  @include progress-value-indeterminate;
}

progress:not([value])::-webkit-progress-value {
  @include progress-value-indeterminate;
}

@keyframes indeterminate {
  from {
    margin-left: -30px;
  }

  to {
    margin-left: 100%;
  }
}