message: refactor: search use css var
diff: -@import '@hi-ui/core-css/index.scss';
  -
  -$basic-color: get-color($palette-primary, 'hiui-blue') !default;
  +@import '../../core-css/index.scss';
  $search: 'hi-search' !default;
  .#{$search} {
  @@ -26,7 +24,7 @@ $search: 'hi-search' !default;
  border-bottom-left-radius: 0;
  &:hover:not(.disabled) {
  - border-color: $basic-color;
  + border-color: use-color('primary');
  }
  &:focus {
  @@ -36,7 +34,7 @@ $search: 'hi-search' !default;
  }
  .hi-icon.icon-search {
  - color: $basic-color;
  + color: use-color('primary');
  }
  &_dropdown {
  @@ -58,10 +56,10 @@ $search: 'hi-search' !default;
  width: 100%;
  height: 252px;
  font-size: 12px;
  - color: #333;
  + color: use-color('black');
  overflow-x: hidden;
  overflow-y: auto;
  - background-color: #fff;
  + background-color: use-color('white');
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.2);
  border-radius: 2px;
  box-sizing: border-box;
  @@ -86,12 +84,12 @@ $search: 'hi-search' !default;
  padding: 0 12px;
  &:hover:not(.hi-search_dropdown--item-title) {
  - background-color: rgba($basic-color, 0.08);
  + background-color: rgba(use-color('primary'), 0.08);
  }
  }
  &-title {
  - color: rgba(0, 0, 0, 0.25);
  + color: use-color('gray-50');
  font-size: 14px;
  }
  @@ -100,7 +98,7 @@ $search: 'hi-search' !default;
  justify-content: space-between;
  align-items: center;
  padding: 0 12px;
  - color: rgba(0, 0, 0, 0.25);
  + color: use-color('gray-50');
  font-size: 14px;
  }
  @@ -108,12 +106,12 @@ $search: 'hi-search' !default;
  height: 260px;
  line-height: 260px;
  text-align: center;
  - color: rgba(0, 0, 0, 0.25);
  + color: use-color('gray-50');
  font-size: 14px;
  }
  &__name-hightlight {
  - color: $basic-color;
  + color: use-color('primary');
  }
  }
  