message: refactor: drawer use css var
diff: +@import '../../core-css/index.scss';
  +
  $drawer: 'hi-drawer' !default;
  -$fontColor: #383e47 !default;
  -$borderColor: #e7e7e7 !default;
  .#{$drawer} {
  - color: $fontColor;
  - font-size: 14px;
  + color: use-color('gray-80');
  + font-size: $font-size-normal;
  &__mask {
  position: fixed;
  @@ -30,7 +30,7 @@ $borderColor: #e7e7e7 !default;
  height: 100%;
  display: flex;
  flex-direction: column;
  - background: #fff;
  + background: use-color('white');
  z-index: 1000;
  top: 0;
  position: fixed;
  @@ -56,10 +56,10 @@ $borderColor: #e7e7e7 !default;
  &__header {
  font-size: 16px;
  - color: #383e47;
  + color: use-color('gray-80');
  font-weight: 500;
  height: 54px;
  - border-bottom: 1px solid $borderColor;
  + border-bottom: 1px solid use-color('gray-30');
  box-sizing: border-box;
  padding: 0 24px;
  display: flex;
  @@ -75,7 +75,7 @@ $borderColor: #e7e7e7 !default;
  }
  &__footer {
  - border-top: 1px solid $borderColor;
  + border-top: 1px solid use-color('gray-30');
  padding: 12px;
  flex-shrink: 0;
  }
  