not advised.

regrettable-mixin.scss

@mixin content-section {
  #content {
    .section {
      border: {
        color: $regrettable_maroon;
        style: solid;
        width: 1px; }; }
    .region-highlight {
      .block {
        margin: {
          bottom: 0; };
        padding: {
          bottom: 1.5em; }; } } }
  #content-area {
    @include trailer(1); }
  .region-highlight,
  div.breadcrumb,
  h1.title,
  .region-content-top,
  #content-area {
    padding: {
      left: 14px;
      right: 14px; }; }
  h1.title {
    @include linear-gradient(color_stops(white, #cccccc), top);
    color: $regrettable_maroon;
    @include adjust-font-size-to(21px);
    font-weight: bold; }
  .region-content-top {
    border: {
      color: $regrettable_maroon;
      style: solid; };
    @include trailing-border(1px); } }

regrettable.scss

body.node-type-policy-brief {
  #comments {
    margin: 0; }
  #content {
    .section,
    .region-highlight,
    .breadcrumb,
    h1.title,
    div.tabs,
    #content-area .node-type-policy-brief,
    .region-content-bottom .block,
    #comments {
      border: {
        color: $regrettable_maroon;
        style: solid; }; }
    .section {
      border: {
        top: {
          width: 1px; };
        bottom: {
          width: 1px; }; }; }
    .region-highlight,
    .breadcrumb,
    div.tabs,
    h1.title {
      border: {
        left: {
          width: 1px; };
        right: {
          width: 1px; }; }; }
    .region-highlight {
      .block {
        margin: {
          bottom: 0; };
        padding: {
          bottom: 1.5em; }; } }
    #content-area .node-type-policy-brief,
    #comments {
      border: {
        left: {
          width: 1px; }; };
      padding: {
        // TODO: this is not the right way to make the border cross the top
        // margin of the enclosed paragraphs.
        top: 1px;
        bottom: 1.5em; };
      h2.title {
        @include leading-border(1px, 1, 18px);
        margin: {
          top: 0; };
        border: {
          color: $regrettable_maroon;
          style: solid; }; } }
    .region-content-bottom {
      .block {
        border: {
          left: {
            width: 1px; };
          right: {
            width: 1px; }; }; } } }
  #block-views-issue_description-block_1 {
    h2.title {
      // modernizr
      @include regrettable-page-heading;
      color: $regrettable_maroon;
      font-weight: bold; }
    .content {
      padding: {
        left: 14px;
        right: 14px; }; } }
  .breadcrumb,
  h1.title,
  #content-area .node-type-policy-brief,
  #comments {
    padding: {
      left: 14px; }; }
  #content {
    h1.title {
      @include regrettable-page-heading;
      background: $regrettable_maroon;
      color: white;
      border: {
        color: $regrettable_maroon;
        left: {
          style: solid;
          width: 1px; };
        right: {
          style: solid;
          width: 1px; }; }; } } }

You don't want to see what this compiles to…