// 合并 map
@function map-deep-merge($parent-map, $child-map) {
  $result: $parent-map;
  @each $key, $child in $child-map {
    $parent-has-key: map-has-key($result, $key);
    $parent-value: map-get($result, $key);
    $parent-type: type-of($parent-value);
    $child-type: type-of($child);
    $parent-is-map: $parent-type == map;
    $child-is-map: $child-type == map;

    @if (not $parent-has-key) or ($parent-type != $child-type) or (not ($parent-is-map and $child-is-map)) {
      $result: map-merge($result, ($key: $child));
    } @else {
      $result: map-merge($result, ($key: map-deep-merge($parent-value, $child)));
    }
  }
  @return $result;
}

;