Switch to prism.js

26 files changed, 2176 insertions, 0 deletions

diff --git a/assets/scss/_primer/base/base.scss b/assets/scss/_primer/base/base.scss
new file mode 100644
index 0000000..381fa89
--- /dev/null
+++ b/assets/scss/_primer/base/base.scss
@@ -0,0 +1,86 @@
+// stylelint-disable selector-max-type
+* {
+  box-sizing: border-box;
+}
+
+input,
+select,
+textarea,
+button {
+  font-family: inherit;
+  font-size: inherit;
+  line-height: inherit;
+}
+
+body {
+  font-family: $body-font;
+  font-size: $body-font-size;
+  line-height: $body-line-height;
+  color: $text-gray-dark;
+  background-color: $bg-white;
+}
+
+a {
+  color: $text-blue;
+  text-decoration: none;
+
+  &:hover {
+    text-decoration: underline;
+  }
+}
+
+b,
+strong {
+  font-weight: $font-weight-bold;
+}
+
+// Horizontal lines
+//
+// TODO-MDO: Remove `.rule` from everywhere and replace with `<hr>`s
+hr,
+.rule {
+  height: 0;
+  // stylelint-disable-next-line primer/spacing
+  margin: 15px 0;
+  overflow: hidden;
+  background: transparent;
+  border: 0;
+  // stylelint-disable-next-line primer/borders
+  border-bottom: $border-width $border-style lighten($gray-300, 5%);
+  @include clearfix();
+}
+
+//
+// Remove most spacing between table cells.
+//
+
+table {
+  border-spacing: 0;
+  border-collapse: collapse;
+}
+
+td,
+th {
+  padding: 0;
+}
+
+button {
+  cursor: pointer;
+  // Remove border radius added by Chrome macOS
+  border-radius: 0;
+}
+
+// increase the selector specificity for [hidden]
+// so that it always overrides utility classes (.d-block, etc.)
+[hidden][hidden] {
+  display: none !important;
+}
+
+details {
+  summary { cursor: pointer; }
+
+  &:not([open]) {
+    // Set details content hidden by default for browsers that don't do this
+    > *:not(summary) { display: none !important; }
+  }
+}
diff --git a/assets/scss/_primer/base/index.scss b/assets/scss/_primer/base/index.scss
new file mode 100644
index 0000000..2c7f8b9
--- /dev/null
+++ b/assets/scss/_primer/base/index.scss
@@ -0,0 +1,6 @@
+@import "../support/index.scss";
+
+@import "./normalize.scss";
+@import "./base.scss";
+@import "./kbd.scss";
+@import "./typography-base.scss";
diff --git a/assets/scss/_primer/base/kbd.scss b/assets/scss/_primer/base/kbd.scss
new file mode 100644
index 0000000..7ee4503
--- /dev/null
+++ b/assets/scss/_primer/base/kbd.scss
@@ -0,0 +1,21 @@
+// Keyboard shortcuts
+// stylelint-disable selector-max-type
+
+kbd {
+  display: inline-block;
+  // stylelint-disable-next-line primer/spacing
+  padding: ($spacer-1 - 1) ($spacer-1 + 1);
+  font: 11px $mono-font;
+  // stylelint-disable-next-line primer/typography
+  line-height: 10px;
+  // stylelint-disable-next-line primer/colors
+  color: $gray-700;
+  vertical-align: middle;
+  background-color: $bg-gray-light;
+  // stylelint-disable-next-line primer/borders
+  border: $border-style $border-width $border-gray-dark;
+  border-bottom-color: $border-gray-dark;
+  border-radius: $border-radius;
+  // stylelint-disable-next-line primer/box-shadow
+  box-shadow: inset 0 -1px 0 $border-gray-dark;
+}
diff --git a/assets/scss/_primer/base/normalize.scss b/assets/scss/_primer/base/normalize.scss
new file mode 100644
index 0000000..95931e7
--- /dev/null
+++ b/assets/scss/_primer/base/normalize.scss
@@ -0,0 +1,421 @@
+// stylelint-disable
+/*! normalize.css v4.1.1 | MIT License | github.com/necolas/normalize.css */
+
+/**
+ * 1. Change the default font family in all browsers (opinionated).
+ * 2. Prevent adjustments of font size after orientation changes in IE and iOS.
+ */
+
+html {
+  font-family: sans-serif; /* 1 */
+  -ms-text-size-adjust: 100%; /* 2 */
+  -webkit-text-size-adjust: 100%; /* 2 */
+}
+
+/**
+ * Remove the margin in all browsers (opinionated).
+ */
+
+body {
+  margin: 0;
+}
+
+/* HTML5 display definitions
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 9-.
+ * 1. Add the correct display in Edge, IE, and Firefox.
+ * 2. Add the correct display in IE.
+ */
+
+article,
+aside,
+details, /* 1 */
+figcaption,
+figure,
+footer,
+header,
+main, /* 2 */
+menu,
+nav,
+section { /* 1 */
+  display: block;
+}
+
+summary {
+  display: list-item;
+}
+
+/**
+ * Add the correct display in IE 9-.
+ */
+
+audio,
+canvas,
+progress,
+video {
+  display: inline-block;
+}
+
+/**
+ * Add the correct display in iOS 4-7.
+ */
+
+audio:not([controls]) {
+  display: none;
+  height: 0;
+}
+
+/**
+ * Add the correct vertical alignment in Chrome, Firefox, and Opera.
+ */
+
+progress {
+  vertical-align: baseline;
+}
+
+/**
+ * Add the correct display in IE 10-.
+ * 1. Add the correct display in IE.
+ */
+
+template, /* 1 */
+[hidden] {
+  display: none !important;
+}
+
+/* Links
+   ========================================================================== */
+
+/**
+ * Remove the gray background on active links in IE 10.
+ */
+
+a {
+  background-color: transparent; /* 1 */
+}
+
+/**
+ * Remove the outline on focused links when they are also active or hovered
+ * in all browsers (opinionated).
+ */
+
+a:active,
+a:hover {
+  outline-width: 0;
+}
+
+/* Text-level semantics
+   ========================================================================== */
+
+/**
+ * 1. Remove the bottom border in Firefox 39-.
+ * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
+ */
+
+abbr[title] {
+  border-bottom: none; /* 1 */
+  text-decoration: underline; /* 2 */
+  text-decoration: underline dotted; /* 2 */
+}
+
+/**
+ * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
+ */
+
+b,
+strong {
+  font-weight: inherit;
+}
+
+/**
+ * Add the correct font weight in Chrome, Edge, and Safari.
+ */
+
+b,
+strong {
+  font-weight: bolder;
+}
+
+/**
+ * Add the correct font style in Android 4.3-.
+ */
+
+dfn {
+  font-style: italic;
+}
+
+/**
+ * Correct the font size and margin on `h1` elements within `section` and
+ * `article` contexts in Chrome, Firefox, and Safari.
+ */
+
+h1 {
+  font-size: 2em;
+  margin: 0.67em 0;
+}
+
+/**
+ * Add the correct background and color in IE 9-.
+ */
+
+mark {
+  background-color: #ff0;
+  color: $text-black;
+}
+
+/**
+ * Add the correct font size in all browsers.
+ */
+
+small {
+  font-size: 80%;
+}
+
+/**
+ * Prevent `sub` and `sup` elements from affecting the line height in
+ * all browsers.
+ */
+
+sub,
+sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+
+sub {
+  bottom: -0.25em;
+}
+
+sup {
+  top: -0.5em;
+}
+
+/* Embedded content
+   ========================================================================== */
+
+/**
+ * Remove the border on images inside links in IE 10-.
+ */
+
+img {
+  border-style: none;
+}
+
+/**
+ * Hide the overflow in IE.
+ */
+
+svg:not(:root) {
+  overflow: hidden;
+}
+
+/* Grouping content
+   ========================================================================== */
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+code,
+kbd,
+pre,
+samp {
+  font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/**
+ * Add the correct margin in IE 8.
+ */
+
+figure {
+  margin: 1em $spacer-6;
+}
+
+/**
+ * 1. Add the correct box sizing in Firefox.
+ * 2. Show the overflow in Edge and IE.
+ */
+
+hr {
+  box-sizing: content-box; /* 1 */
+  height: 0; /* 1 */
+  overflow: visible; /* 2 */
+}
+
+/* Forms
+   ========================================================================== */
+
+/**
+ * 1. Change font properties to `inherit` in all browsers (opinionated).
+ * 2. Remove the margin in Firefox and Safari.
+ */
+
+button,
+input,
+select,
+textarea {
+  font: inherit; /* 1 */
+  margin: 0; /* 2 */
+}
+
+/**
+ * Restore the font weight unset by the previous rule.
+ */
+
+optgroup {
+  font-weight: $font-weight-bold;
+}
+
+/**
+ * Show the overflow in IE.
+ * 1. Show the overflow in Edge.
+ */
+
+button,
+input { /* 1 */
+  overflow: visible;
+}
+
+/**
+ * Remove the inheritance of text transform in Edge, Firefox, and IE.
+ * 1. Remove the inheritance of text transform in Firefox.
+ */
+
+button,
+select { /* 1 */
+  text-transform: none;
+}
+
+/**
+ * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
+ *    controls in Android 4.
+ * 2. Correct the inability to style clickable types in iOS and Safari.
+ */
+
+button,
+html [type="button"], /* 1 */
+[type="reset"],
+[type="submit"] {
+  -webkit-appearance: button; /* 2 */
+}
+
+/**
+ * Remove the inner border and padding in Firefox.
+ */
+
+button::-moz-focus-inner,
+[type="button"]::-moz-focus-inner,
+[type="reset"]::-moz-focus-inner,
+[type="submit"]::-moz-focus-inner {
+  border-style: none;
+  padding: 0;
+}
+
+/**
+ * Restore the focus styles unset by the previous rule.
+ */
+
+button:-moz-focusring,
+[type="button"]:-moz-focusring,
+[type="reset"]:-moz-focusring,
+[type="submit"]:-moz-focusring {
+  outline: 1px dotted ButtonText;
+}
+
+/**
+ * Change the border, margin, and padding in all browsers (opinionated).
+ */
+
+fieldset {
+  border: $border-width $border-style #c0c0c0;
+  margin: 0 2px;
+  padding: 0.35em 0.625em $em-spacer-6;
+}
+
+/**
+ * 1. Correct the text wrapping in Edge and IE.
+ * 2. Correct the color inheritance from `fieldset` elements in IE.
+ * 3. Remove the padding so developers are not caught out when they zero out
+ *    `fieldset` elements in all browsers.
+ */
+
+legend {
+  box-sizing: border-box; /* 1 */
+  color: inherit; /* 2 */
+  display: table; /* 1 */
+  max-width: 100%; /* 1 */
+  padding: 0; /* 3 */
+  white-space: normal; /* 1 */
+}
+
+/**
+ * Remove the default vertical scrollbar in IE.
+ */
+
+textarea {
+  overflow: auto;
+}
+
+/**
+ * 1. Add the correct box sizing in IE 10-.
+ * 2. Remove the padding in IE 10-.
+ */
+
+[type="checkbox"],
+[type="radio"] {
+  box-sizing: border-box; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Correct the cursor style of increment and decrement buttons in Chrome.
+ */
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+/**
+ * 1. Correct the odd appearance in Chrome and Safari.
+ * 2. Correct the outline style in Safari.
+ */
+
+[type="search"] {
+  -webkit-appearance: textfield; /* 1 */
+  outline-offset: -2px; /* 2 */
+}
+
+/**
+ * Remove the inner padding and cancel buttons in Chrome and Safari on OS X.
+ */
+
+[type="search"]::-webkit-search-cancel-button,
+[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+/**
+ * Correct the text style of placeholders in Chrome, Edge, and Safari.
+ */
+
+::-webkit-input-placeholder {
+  color: inherit;
+  opacity: 0.54;
+}
+
+/**
+ * 1. Correct the inability to style clickable types in iOS and Safari.
+ * 2. Change font properties to `inherit` in Safari.
+ */
+
+::-webkit-file-upload-button {
+  -webkit-appearance: button; /* 1 */
+  font: inherit; /* 2 */
+}
diff --git a/assets/scss/_primer/base/typography-base.scss b/assets/scss/_primer/base/typography-base.scss
new file mode 100644
index 0000000..83eb995
--- /dev/null
+++ b/assets/scss/_primer/base/typography-base.scss
@@ -0,0 +1,88 @@
+// Headings
+// --------------------------------------------------
+// stylelint-disable selector-max-type
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+  margin-top: 0;
+  margin-bottom: 0;
+}
+
+h1 { @include h1; }
+h2 { @include h2; }
+h3 { @include h3; }
+h4 { @include h4; }
+h5 { @include h5; }
+h6 { @include h6; }
+
+// Body text
+// --------------------------------------------------
+
+p {
+  margin-top: 0;
+  // stylelint-disable-next-line primer/spacing
+  margin-bottom: 10px;
+}
+
+small {
+  // stylelint-disable-next-line primer/typography
+  font-size: 90%;
+}
+
+blockquote {
+  margin: 0;
+}
+
+// Lists
+// --------------------------------------------------
+
+ul,
+ol {
+  padding-left: 0;
+  margin-top: 0;
+  margin-bottom: 0;
+}
+
+ol ol,
+ul ol {
+  list-style-type: lower-roman;
+}
+
+ul ul ol,
+ul ol ol,
+ol ul ol,
+ol ol ol {
+  list-style-type: lower-alpha;
+}
+
+dd {
+  margin-left: 0;
+}
+
+// Code
+// --------------------------------------------------
+
+tt,
+code {
+  font-family: $mono-font;
+  font-size: $font-size-small;
+}
+
+pre {
+  margin-top: 0;
+  margin-bottom: 0;
+  font-family: $mono-font;
+  font-size: $font-size-small;
+}
+
+// Octicons
+// --------------------------------------------------
+
+// Move this over here as a temporary override to the octicons source repo
+// instead of updating that upstream.
+.octicon {
+  vertical-align: text-bottom;
+}
diff --git a/assets/scss/_primer/layout/container.scss b/assets/scss/_primer/layout/container.scss
new file mode 100644
index 0000000..7e70a6b
--- /dev/null
+++ b/assets/scss/_primer/layout/container.scss
@@ -0,0 +1,30 @@
+// Fixed-width, centered column for site content.
+// Handy container styles that match our breakpoints
+
+// 544px
+.container-sm {
+  max-width: $width-sm;
+  margin-right: auto;
+  margin-left: auto;
+}
+
+// 768px
+.container-md {
+  max-width: $container-md;
+  margin-right: auto;
+  margin-left: auto;
+}
+
+// 1004px - this matches the current fixed width: 980px + padding: px-3
+.container-lg {
+  max-width: $container-lg;
+  margin-right: auto;
+  margin-left: auto;
+}
+
+// 1280px
+.container-xl {
+  max-width: $container-xl;
+  margin-right: auto;
+  margin-left: auto;
+}
diff --git a/assets/scss/_primer/layout/grid.scss b/assets/scss/_primer/layout/grid.scss
new file mode 100644
index 0000000..5126c6b
--- /dev/null
+++ b/assets/scss/_primer/layout/grid.scss
@@ -0,0 +1,64 @@
+// GRID
+
+// Columns
+.col-1 { width: (1 / 12 * 100%); }
+.col-2 { width: (2 / 12 * 100%); }
+.col-3 { width: (3 / 12 * 100%); }
+.col-4 { width: (4 / 12 * 100%); }
+.col-5 { width: (5 / 12 * 100%); }
+.col-6 { width: (6 / 12 * 100%); }
+.col-7 { width: (7 / 12 * 100%); }
+.col-8 { width: (8 / 12 * 100%); }
+.col-9 { width: (9 / 12 * 100%); }
+.col-10 { width: (10 / 12 * 100%); }
+.col-11 { width: (11 / 12 * 100%); }
+.col-12 { width: 100%; }
+
+@each $breakpoint in map-keys($breakpoints) {
+  @include breakpoint($breakpoint) {
+    .col-#{$breakpoint}-1 { width: ( 1 / 12 * 100%); }
+    .col-#{$breakpoint}-2 { width: ( 2 / 12 * 100%); }
+    .col-#{$breakpoint}-3 { width: ( 3 / 12 * 100%); }
+    .col-#{$breakpoint}-4 { width: ( 4 / 12 * 100%); }
+    .col-#{$breakpoint}-5 { width: ( 5 / 12 * 100%); }
+    .col-#{$breakpoint}-6 { width: ( 6 / 12 * 100%); }
+    .col-#{$breakpoint}-7 { width: ( 7 / 12 * 100%); }
+    .col-#{$breakpoint}-8 { width: ( 8 / 12 * 100%); }
+    .col-#{$breakpoint}-9 { width: ( 9 / 12 * 100%); }
+    .col-#{$breakpoint}-10 { width: ( 10 / 12 * 100%); }
+    .col-#{$breakpoint}-11 { width: ( 11 / 12 * 100%); }
+    .col-#{$breakpoint}-12 { width: 100%; }
+  }
+}
+
+// Gutters
+// Apply padding and a negative margin to the outside of the container
+@mixin gutters ($gutter-width: $spacer-3) {
+  margin-right: -$gutter-width;
+  margin-left: -$gutter-width;
+
+  > [class*="col-"] {
+    padding-right: $gutter-width !important;
+    padding-left: $gutter-width !important;
+  }
+}
+
+.gutter {
+  @include gutters($spacer-3);
+}
+
+.gutter-condensed {
+  @include gutters($spacer-2);
+}
+
+.gutter-spacious {
+  @include gutters($spacer-4);
+}
+
+@each $breakpoint in map-keys($breakpoints) {
+  @include breakpoint($breakpoint) {
+    .gutter-#{$breakpoint} { @include gutters($spacer-3); }
+    .gutter-#{$breakpoint}-condensed { @include gutters($spacer-2); }
+    .gutter-#{$breakpoint}-spacious { @include gutters($spacer-4); }
+  }
+}
diff --git a/assets/scss/_primer/markdown/blob-csv.scss b/assets/scss/_primer/markdown/blob-csv.scss
new file mode 100644
index 0000000..e97e447
--- /dev/null
+++ b/assets/scss/_primer/markdown/blob-csv.scss
@@ -0,0 +1,29 @@
+// stylelint-disable selector-max-type
+.markdown-body .csv-data {
+  td,
+  th {
+    // stylelint-disable-next-line primer/spacing
+    padding: 5px;
+    overflow: hidden;
+    font-size: $font-size-small;
+    line-height: $lh-condensed-ultra;
+    text-align: left;
+    white-space: nowrap;
+  }
+
+  .blob-num {
+    // stylelint-disable-next-line primer/spacing
+    padding: 10px $spacer-2 9px;
+    text-align: right;
+    background: $bg-white;
+    border: 0;
+  }
+
+  tr { border-top: 0; }
+
+  th {
+    font-weight: $font-weight-bold;
+    background: $bg-gray;
+    border-top: 0;
+  }
+}
diff --git a/assets/scss/_primer/markdown/code.scss b/assets/scss/_primer/markdown/code.scss
new file mode 100644
index 0000000..fbd2d16
--- /dev/null
+++ b/assets/scss/_primer/markdown/code.scss
@@ -0,0 +1,69 @@
+// stylelint-disable selector-max-type
+.markdown-body {
+  // Inline code snippets
+  code,
+  tt {
+    // stylelint-disable-next-line primer/spacing
+    padding: 0.2em 0.4em;
+    margin: 0;
+    // stylelint-disable-next-line primer/typography
+    font-size: 85%;
+    // stylelint-disable-next-line primer/colors
+    background-color: rgba($black, 0.05);
+    border-radius: $border-radius;
+
+    br { display: none; }
+  }
+
+  del code { text-decoration: inherit; }
+
+  pre {
+    word-wrap: normal;
+
+    // Code tags within code blocks (<pre>s)
+    > code {
+      padding: 0;
+      margin: 0;
+      // stylelint-disable-next-line primer/typography
+      font-size: 100%;
+      word-break: normal;
+      white-space: pre;
+      background: transparent;
+      border: 0;
+    }
+  }
+
+  .highlight {
+    margin-bottom: $spacer-3;
+
+    pre {
+      margin-bottom: 0;
+      word-break: normal;
+    }
+  }
+
+  .highlight pre,
+  pre {
+    padding: $spacer-3;
+    overflow: auto;
+    // stylelint-disable-next-line primer/typography
+    font-size: 85%;
+    // stylelint-disable-next-line primer/typography
+    line-height: 1.45;
+    background-color: $bg-gray;
+    border-radius: $border-radius;
+  }
+
+  pre code,
+  pre tt {
+    display: inline;
+    max-width: auto;
+    padding: 0;
+    margin: 0;
+    overflow: visible;
+    line-height: inherit;
+    word-wrap: normal;
+    background-color: transparent;
+    border: 0;
+  }
+}
diff --git a/assets/scss/_primer/markdown/headings.scss b/assets/scss/_primer/markdown/headings.scss
new file mode 100644
index 0000000..26347bb
--- /dev/null
+++ b/assets/scss/_primer/markdown/headings.scss
@@ -0,0 +1,72 @@
+// Needs refactoring
+// stylelint-disable selector-max-compound-selectors, selector-max-specificity
+// stylelint-disable selector-max-type
+.markdown-body {
+  // Headings
+  h1,
+  h2,
+  h3,
+  h4,
+  h5,
+  h6 {
+    margin-top: $spacer-4;
+    margin-bottom: $spacer-3;
+    font-weight: $font-weight-bold;
+    line-height: $lh-condensed;
+
+    .octicon-link {
+      color: $text-black;
+      vertical-align: middle;
+      visibility: hidden;
+    }
+
+    &:hover .anchor {
+      text-decoration: none;
+
+      .octicon-link {
+        visibility: visible;
+      }
+    }
+
+    tt,
+    code {
+      font-size: inherit;
+    }
+  }
+
+  h1 {
+    // stylelint-disable-next-line primer/spacing
+    padding-bottom: 0.3em;
+    // stylelint-disable-next-line primer/typography
+    font-size: 2em;
+    border-bottom: $border-width $border-style $border-gray-light;
+  }
+
+  h2 {
+    // stylelint-disable-next-line primer/spacing
+    padding-bottom: 0.3em;
+    // stylelint-disable-next-line primer/typography
+    font-size: 1.5em;
+    border-bottom: $border-width $border-style $border-gray-light;
+  }
+
+  h3 {
+    // stylelint-disable-next-line primer/typography
+    font-size: 1.25em;
+  }
+
+  h4 {
+    font-size: 1em;
+  }
+
+  h5 {
+    // stylelint-disable-next-line primer/typography
+    font-size: 0.875em;
+  }
+
+  h6 {
+    // stylelint-disable-next-line primer/typography
+    font-size: 0.85em;
+    color: $text-gray-light;
+  }
+}
diff --git a/assets/scss/_primer/markdown/images.scss b/assets/scss/_primer/markdown/images.scss
new file mode 100644
index 0000000..caea502
--- /dev/null
+++ b/assets/scss/_primer/markdown/images.scss
@@ -0,0 +1,131 @@
+// Need to target base styles
+// stylelint-disable selector-max-compound-selectors, selector-no-qualifying-type
+// stylelint-disable selector-max-type
+.markdown-body {
+  // Images & Stuff
+  img {
+    max-width: 100%;
+    // because we put padding on the images to hide header lines, and some people
+    // specify the width of their images in their markdown.
+    box-sizing: content-box;
+    background-color: $bg-white;
+
+    &[align=right] {
+      // stylelint-disable-next-line primer/spacing
+      padding-left: 20px;
+    }
+
+    &[align=left] {
+      // stylelint-disable-next-line primer/spacing
+      padding-right: 20px;
+    }
+  }
+
+  .emoji {
+    max-width: none;
+    vertical-align: text-top;
+    // Override `<img>` styles so Emjois don't clash with zebra striping in our tables
+    background-color: transparent;
+  }
+
+  // Gollum Image Tags
+
+  // Framed
+  span.frame {
+    display: block;
+    overflow: hidden;
+
+    > span {
+      display: block;
+      float: left;
+      width: auto;
+      // stylelint-disable-next-line primer/spacing
+      padding: 7px;
+      // stylelint-disable-next-line primer/spacing
+      margin: 13px 0 0;
+      overflow: hidden;
+      // stylelint-disable-next-line primer/borders
+      border: $border-width $border-style lighten($gray-300, 5%);
+    }
+
+    span img {
+      display: block;
+      float: left;
+    }
+
+    span span {
+      display: block;
+      // stylelint-disable-next-line primer/spacing
+      padding: 5px 0 0;
+      clear: both;
+      color: $text-gray-dark;
+    }
+  }
+
+  span.align-center {
+    display: block;
+    overflow: hidden;
+    clear: both;
+
+    > span {
+      display: block;
+      // stylelint-disable-next-line primer/spacing
+      margin: 13px auto 0;
+      overflow: hidden;
+      text-align: center;
+    }
+
+    span img {
+      margin: 0 auto;
+      text-align: center;
+    }
+  }
+
+  span.align-right {
+    display: block;
+    overflow: hidden;
+    clear: both;
+
+    > span {
+      display: block;
+      // stylelint-disable-next-line primer/spacing
+      margin: 13px 0 0;
+      overflow: hidden;
+      text-align: right;
+    }
+
+    span img {
+      margin: 0;
+      text-align: right;
+    }
+  }
+
+  span.float-left {
+    display: block;
+    float: left;
+    // stylelint-disable-next-line primer/spacing
+    margin-right: 13px;
+    overflow: hidden;
+
+    span {
+      // stylelint-disable-next-line primer/spacing
+      margin: 13px 0 0;
+    }
+  }
+
+  span.float-right {
+    display: block;
+    float: right;
+    // stylelint-disable-next-line primer/spacing
+    margin-left: 13px;
+    overflow: hidden;
+
+    > span {
+      display: block;
+      // stylelint-disable-next-line primer/spacing
+      margin: 13px auto 0;
+      overflow: hidden;
+      text-align: right;
+    }
+  }
+}
diff --git a/assets/scss/_primer/markdown/index.scss b/assets/scss/_primer/markdown/index.scss
new file mode 100644
index 0000000..b2e8d3d
--- /dev/null
+++ b/assets/scss/_primer/markdown/index.scss
@@ -0,0 +1,8 @@
+@import "../support/index.scss";
+@import "./markdown-body.scss";
+@import "./headings.scss";
+@import "./lists.scss";
+@import "./tables.scss";
+@import "./images.scss";
+@import "./code.scss";
+@import "./blob-csv.scss";
diff --git a/assets/scss/_primer/markdown/lists.scss b/assets/scss/_primer/markdown/lists.scss
new file mode 100644
index 0000000..b680faf
--- /dev/null
+++ b/assets/scss/_primer/markdown/lists.scss
@@ -0,0 +1,77 @@
+// Base styles
+// stylelint-disable selector-no-qualifying-type
+// stylelint-disable selector-max-type
+.markdown-body {
+
+  // Lists, Blockquotes & Such
+  ul,
+  ol {
+    // stylelint-disable-next-line primer/spacing
+    padding-left: 2em;
+
+    &.no-list {
+      padding: 0;
+      list-style-type: none;
+    }
+  }
+
+  // Did someone complain about list spacing? Encourage them
+  // to create the spacing with their markdown formatting.
+  // List behavior should be controled by the markup, not the css.
+  //
+  // For lists with padding between items, use blank
+  // lines between items. This will generate paragraphs with
+  // padding to space things out.
+  //
+  // - item
+  //
+  // - item
+  //
+  // - item
+  //
+  // For list without padding, don't use blank lines.
+  //
+  // - item
+  // - item
+  // - item
+  //
+  // Modifying the css to emulate these behaviors merely brakes
+  // one case in the process of solving another. Don't change
+  // this unless it's really really a bug.
+  ul ul,
+  ul ol,
+  ol ol,
+  ol ul {
+    margin-top: 0;
+    margin-bottom: 0;
+  }
+
+  li {
+    word-wrap: break-all;
+  }
+
+  li > p {
+    margin-top: $spacer-3;
+  }
+
+  li + li {
+    margin-top: $em-spacer-3;
+  }
+
+  dl {
+    padding: 0;
+
+    dt {
+      padding: 0;
+      margin-top: $spacer-3;
+      font-size: 1em;
+      font-style: italic;
+      font-weight: $font-weight-bold;
+    }
+
+    dd {
+      padding: 0 $spacer-3;
+      margin-bottom: $spacer-3;
+    }
+  }
+}
diff --git a/assets/scss/_primer/markdown/markdown-body.scss b/assets/scss/_primer/markdown/markdown-body.scss
new file mode 100644
index 0000000..6581f19
--- /dev/null
+++ b/assets/scss/_primer/markdown/markdown-body.scss
@@ -0,0 +1,99 @@
+// All of our block level items should have the same margin
+// stylelint-disable selector-max-type
+
+// This is styling for generic markdownized text. Anything you put in a
+// container with .markdown-body on it should render generally well. It also
+// includes some GitHub Flavored Markdown specific styling (like @mentions)
+.markdown-body {
+  font-family: $body-font;
+  font-size: $h4-size;
+  line-height: $body-line-height;
+  word-wrap: break-word;
+
+  @import "../base/kbd.scss"; // adds support for keyboard shortcuts
+
+  // Clearfix on the markdown body
+  &::before {
+    display: table;
+    content: "";
+  }
+
+  &::after {
+    display: table;
+    clear: both;
+    content: "";
+  }
+
+  > *:first-child {
+    margin-top: 0 !important;
+  }
+
+  > *:last-child {
+    margin-bottom: 0 !important;
+  }
+
+  // Anchors like <a name="examples">. These sometimes end up wrapped around
+  // text when users mistakenly forget to close the tag or use self-closing tag
+  // syntax. We don't want them to appear like links.
+  // FIXME: a:not(:link):not(:visited) would be a little clearer here (and
+  // possibly faster to match), but it breaks styling of <a href> elements due
+  // to https://bugs.webkit.org/show_bug.cgi?id=142737.
+  a:not([href]) {
+    color: inherit;
+    text-decoration: none;
+  }
+
+  // Link Colors
+  .absent {
+    color: $text-red;
+  }
+
+  .anchor {
+    float: left;
+    padding-right: $spacer-1;
+    // stylelint-disable-next-line primer/spacing
+    margin-left: -20px;
+    line-height: $lh-condensed-ultra;
+
+    &:focus {
+      outline: none;
+    }
+  }
+
+  p,
+  blockquote,
+  ul,
+  ol,
+  dl,
+  table,
+  pre,
+  details {
+    margin-top: 0;
+    margin-bottom: $spacer-3;
+  }
+
+  hr {
+    height: $em-spacer-3;
+    padding: 0;
+    margin: $spacer-4 0;
+    // stylelint-disable-next-line primer/colors
+    background-color: $gray-200;
+    border: 0;
+  }
+
+  blockquote {
+    // stylelint-disable-next-line primer/spacing
+    padding: 0 1em;
+    color: $text-gray-light;
+    // stylelint-disable-next-line primer/borders
+    border-left: 0.25em $border-style lighten($gray-300, 5%);
+
+    > :first-child {
+      margin-top: 0;
+    }
+
+    > :last-child {
+      margin-bottom: 0;
+    }
+  }
+}
diff --git a/assets/scss/_primer/markdown/tables.scss b/assets/scss/_primer/markdown/tables.scss
new file mode 100644
index 0000000..9d73d17
--- /dev/null
+++ b/assets/scss/_primer/markdown/tables.scss
@@ -0,0 +1,36 @@
+// Needs refactoring
+// stylelint-disable selector-max-type
+.markdown-body {
+  // Tables
+  table {
+    display: block;
+    width: 100%;
+    overflow: auto;
+
+    th {
+      font-weight: $font-weight-bold;
+    }
+
+    th,
+    td {
+      // stylelint-disable-next-line primer/spacing
+      padding: 6px 13px;
+      // stylelint-disable-next-line primer/borders
+      border: $border-width $border-style lighten($gray-300, 5%);
+    }
+
+    tr {
+      background-color: $bg-white;
+      // stylelint-disable-next-line primer/borders
+      border-top: $border-width $border-style darken($gray-300, 4%);
+
+      &:nth-child(2n) {
+        background-color: $bg-gray;
+      }
+    }
+
+    img {
+      background-color: transparent;
+    }
+  }
+}
diff --git a/assets/scss/_primer/support/index.scss b/assets/scss/_primer/support/index.scss
new file mode 100644
index 0000000..93f9449
--- /dev/null
+++ b/assets/scss/_primer/support/index.scss
@@ -0,0 +1,11 @@
+// variables
+@import "./variables/typography.scss";
+@import "./variables/colors.scss";
+@import "./variables/layout.scss";
+@import "./variables/misc.scss";
+
+// mixins
+@import "./mixins/typography.scss";
+@import "./mixins/layout.scss";
+@import "./mixins/buttons.scss";
+@import "./mixins/misc.scss";
diff --git a/assets/scss/_primer/support/mixins/buttons.scss b/assets/scss/_primer/support/mixins/buttons.scss
new file mode 100644
index 0000000..4b6cbb3
--- /dev/null
+++ b/assets/scss/_primer/support/mixins/buttons.scss
@@ -0,0 +1,167 @@
+// Button color generator for primary and themed buttons
+
+// New button hotness
+@mixin btn-solid($color, $bg, $bg2) {
+  color: $color;
+  background-color: $bg2;
+  background-image: linear-gradient(-180deg, $bg 0%, $bg2 90%);
+
+  @if $bg == $gray-000 {
+    &:focus,
+    &.focus {
+      box-shadow: $btn-input-focus-shadow;
+    }
+
+    &:hover,
+    &.hover {
+      background-color: darken($bg2, 3%);
+      background-image: linear-gradient(-180deg, darken($bg, 3%) 0%, darken($bg2, 3%) 90%);
+      background-position: 0 -$em-spacer-5;
+      border-color: rgba($black, 0.35);
+    }
+
+    &:active,
+    &.selected,
+    &[aria-selected=true],
+    [open] > & {
+      background-color: darken(desaturate($bg, 10%), 6%);
+      background-image: none;
+      border-color: rgba($black, 0.35); // repeat to avoid shift on click-drag off of button
+      box-shadow: $btn-active-shadow;
+    }
+
+    &:disabled,
+    &.disabled,
+    &[aria-disabled=true] {
+      color: rgba($color, 0.4);
+      background-color: $bg2;
+      background-image: none;
+      border-color: $border-color-button;
+      box-shadow: none;
+    }
+
+  }
+  @else {
+    &:focus,
+    &.focus {
+      box-shadow: 0 0 0 0.2em rgba($bg, 0.4);
+    }
+
+    &:hover,
+    &.hover {
+      background-color: darken($bg2, 2%);
+      background-image: linear-gradient(-180deg, darken($bg, 2%) 0%, darken($bg2, 2%) 90%);
+      background-position: 0 -$em-spacer-5;
+      border-color: $black-fade-50;
+    }
+
+    &:active,
+    &.selected,
+    &[aria-selected=true],
+    [open] > & {
+      background-color: darken(mix($bg, $bg2, 50%), 7%);
+      background-image: none;
+      border-color: $black-fade-50; // repeat to avoid shift on click-drag off of button
+      box-shadow: $btn-active-shadow;
+    }
+
+    &:disabled,
+    &.disabled,
+    &[aria-disabled=true] {
+      color: rgba($color, 0.75);
+      background-color: mix($bg2, $white, 50%);
+      background-image: none;
+      border-color: $border-color-button;
+      box-shadow: none;
+    }
+
+    .Counter {
+      color: darken($bg, 8%);
+      background-color: $white;
+    }
+  }
+}
+
+// Inverse button hover style
+@mixin btn-inverse($color, $bg, $bg2) {
+  color: $color;
+  background-color: $bg;
+  background-image: linear-gradient(-180deg, $bg 0%, $bg2 90%);
+
+  &:focus {
+    box-shadow: 0 0 0 0.2em rgba($color, 0.4);
+  }
+
+  &:hover {
+    color: $text-white;
+    background-color: $color;
+    background-image: linear-gradient(-180deg, lighten($color, 10%) 0%, $color 90%);
+    border-color: $black-fade-50;
+
+    .Counter {
+      color: $text-white;
+    }
+  }
+
+  &:active,
+  &.selected,
+  &[aria-selected=true],
+  [open] > & {
+    color: $text-white;
+    background-color: darken($color, 5%);
+    background-image: none;
+    border-color: $black-fade-50;
+    box-shadow: $btn-active-shadow;
+  }
+
+  &:disabled,
+  &.disabled,
+  &[aria-disabled=true] {
+    color: rgba($color, 0.4);
+    background-color: $bg2;
+    background-image: none;
+    border-color: $border-color-button;
+    box-shadow: none;
+  }
+}
+
+// Outline color generator for btn-outline to make the hover state inverse the text and bg colors.
+@mixin btn-outline($text-color: $text-blue, $bg-color: $bg-white) {
+  color: $text-color;
+  background-color: $bg-color;
+  background-image: none;
+
+  .Counter {
+    background-color: rgba($black, 0.07);
+  }
+
+  &:hover,
+  &:active,
+  &.selected,
+  &[aria-selected=true],
+  [open] > & {
+    color: $bg-color;
+    background-color: $text-color;
+    background-image: none;
+    border-color: $text-color;
+
+    .Counter {
+      color: $text-color;
+      background-color: $bg-color;
+    }
+  }
+
+  &:focus {
+    border-color: $text-color;
+    box-shadow: 0 0 0 0.2em rgba($text-color, 0.4);
+  }
+
+  &:disabled,
+  &.disabled,
+  &[aria-disabled=true] {
+    color: $black-fade-30;
+    background-color: $bg-white;
+    border-color: $black-fade-15;
+    box-shadow: none;
+  }
+}
diff --git a/assets/scss/_primer/support/mixins/layout.scss b/assets/scss/_primer/support/mixins/layout.scss
new file mode 100644
index 0000000..a6d30cf
--- /dev/null
+++ b/assets/scss/_primer/support/mixins/layout.scss
@@ -0,0 +1,58 @@
+// Responsive media queries
+
+@mixin breakpoint($breakpoint) {
+  @if $breakpoint == "" {
+    @content;
+  }
+
+  @else {
+    // Retrieves the value from the key
+    $value: map-get($breakpoints, $breakpoint);
+
+    // If the key exists in the map
+    @if $value != null {
+      // Prints a media query based on the value
+      @media (min-width: $value) {
+        @content;
+      }
+    }
+
+    // If the key doesn't exist in the map
+    @else {
+      @warn "Unfortunately, no value could be retrieved from `#{$breakpoint}`. "
+        + "Please make sure it is defined in `$breakpoints` map.";
+    }
+  }
+}
+
+// Retina media query
+
+@mixin retina-media-query {
+  @media
+    only screen and (-webkit-min-device-pixel-ratio: 2),
+    only screen and (min--moz-device-pixel-ratio: 2),
+    only screen and (-moz-min-device-pixel-ratio: 2),
+    only screen and (-o-min-device-pixel-ratio: 2/1),
+    only screen and (min-device-pixel-ratio: 2),
+    only screen and (min-resolution: 192dpi),
+    only screen and (min-resolution: 2dppx) {
+    @content;
+  }
+}
+
+// Clearfix
+//
+// Clears floats via mixin.
+
+@mixin clearfix {
+  &::before {
+    display: table;
+    content: "";
+  }
+
+  &::after {
+    display: table;
+    clear: both;
+    content: "";
+  }
+}
diff --git a/assets/scss/_primer/support/mixins/misc.scss b/assets/scss/_primer/support/mixins/misc.scss
new file mode 100644
index 0000000..ebdd32d
--- /dev/null
+++ b/assets/scss/_primer/support/mixins/misc.scss
@@ -0,0 +1,29 @@
+// Generate a two-color caret for any element.
+@mixin double-caret($foreground: $text-white, $background: lighten($gray-300, 5%)) {
+  &::after,
+  &::before {
+    position: absolute;
+    top: 11px;
+    right: 100%;
+    left: -16px;
+    display: block;
+    width: 0;
+    height: 0;
+    pointer-events: none;
+    content: " ";
+    border-color: transparent;
+    border-style: solid solid outset;
+  }
+
+  &::after {
+    margin-top: 1px;
+    margin-left: 2px;
+    border-width: 7px;
+    border-right-color: $foreground;
+  }
+
+  &::before {
+    border-width: 8px;
+    border-right-color: $background;
+  }
+}
diff --git a/assets/scss/_primer/support/mixins/typography.scss b/assets/scss/_primer/support/mixins/typography.scss
new file mode 100644
index 0000000..23ec0e3
--- /dev/null
+++ b/assets/scss/_primer/support/mixins/typography.scss
@@ -0,0 +1,84 @@
+// Text hiding for image based text replacement.
+// Higher performance than -9999px because it only renders
+// the size of the actual text, not a full 9999px box.
+@mixin hide-text() {
+  overflow: hidden;
+  text-indent: 100%;
+  white-space: nowrap;
+}
+
+// Heading mixins for use within components
+// These match heading utilities in utilities/typography
+@mixin h1 {
+  font-size: $h1-size;
+  font-weight: $font-weight-bold;
+}
+
+@mixin h2 {
+  font-size: $h2-size;
+  font-weight: $font-weight-bold;
+}
+
+@mixin h3 {
+  font-size: $h3-size;
+  font-weight: $font-weight-bold;
+}
+
+@mixin h4 {
+  font-size: $h4-size;
+  font-weight: $font-weight-bold;
+}
+
+@mixin h5 {
+  font-size: $h5-size;
+  font-weight: $font-weight-bold;
+}
+
+@mixin h6 {
+  font-size: $h6-size;
+  font-weight: $font-weight-bold;
+}
+
+// Responsive heading mixins
+// There are no responsive mixins for h4-h6 because they are small
+// and don't need to be smaller on mobile.
+@mixin f1-responsive {
+  font-size: $h1-size-mobile;
+
+  // 32px on desktop
+  @include breakpoint(md) { font-size: $h1-size; }
+
+}
+
+@mixin f2-responsive {
+  font-size: $h2-size-mobile;
+
+  // 24px on desktop
+  @include breakpoint(md) { font-size: $h2-size; }
+}
+
+@mixin f3-responsive {
+  font-size: $h3-size-mobile;
+
+  // 20px on desktop
+  @include breakpoint(md) { font-size: $h3-size; }
+
+}
+
+// These use the mixins from above for responsive heading sizes.
+// The following mixins can be used where it's convenient or necessary to
+// couple the responsive font-size with the font-weight.
+@mixin h1-responsive {
+  @include f1-responsive;
+  font-weight: $font-weight-bold;
+}
+
+@mixin h2-responsive {
+  @include f2-responsive;
+  font-weight: $font-weight-bold;
+}
+
+@mixin h3-responsive {
+  @include f3-responsive;
+  font-weight: $font-weight-bold;
+}
diff --git a/assets/scss/_primer/support/variables/color-system.scss b/assets/scss/_primer/support/variables/color-system.scss
new file mode 100644
index 0000000..febc58b
--- /dev/null
+++ b/assets/scss/_primer/support/variables/color-system.scss
@@ -0,0 +1,243 @@
+// Black based on same hue as $gray-900
+$black: #1b1f23 !default;
+$white: #fff !default;
+
+//
+//
+// -------- Grays --------
+$gray-000:        #fafbfc !default;
+$gray-100:        #f6f8fa !default;
+$gray-200:        #e1e4e8 !default;
+$gray-300:        #d1d5da !default;
+$gray-400:        #959da5 !default;
+$gray-500:        #6a737d !default;
+$gray-600:        #586069 !default;
+$gray-700:        #444d56 !default;
+$gray-800:        #2f363d !default;
+$gray-900:        #24292e !default; // body font color
+
+// -------- Blue --------
+$blue-000:        #f1f8ff !default;
+$blue-100:        #dbedff !default;
+$blue-200:        #c8e1ff !default;
+$blue-300:        #79b8ff !default;
+$blue-400:        #2188ff !default;
+$blue-500:        #0366d6 !default; // Default: Passes AA with #fff
+$blue-600:        #005cc5 !default;
+$blue-700:        #044289 !default;
+$blue-800:        #032f62 !default;
+$blue-900:        #05264c !default; // Passes with 1/2/300 blues
+
+// -------- Green --------
+$green-000:       #f0fff4 !default;
+$green-100:       #dcffe4 !default;
+$green-200:       #bef5cb !default;
+$green-300:       #85e89d !default;
+$green-400:       #34d058 !default;
+$green-500:       #28a745 !default; // Default. passes AA Large
+$green-600:       #22863a !default; // Text green, passes AA on #fff
+$green-700:       #176f2c !default;
+$green-800:       #165c26 !default;
+$green-900:       #144620 !default;
+
+// -------- Yellow --------
+$yellow-000:      #fffdef !default;
+$yellow-100:      #fffbdd !default;
+$yellow-200:      #fff5b1 !default;
+$yellow-300:      #ffea7f !default;
+$yellow-400:      #ffdf5d !default;
+$yellow-500:      #ffd33d !default;
+$yellow-600:      #f9c513 !default;
+$yellow-700:      #dbab09 !default;
+$yellow-800:      #b08800 !default;
+$yellow-900:      #735c0f !default;
+
+// -------- Orange --------
+$orange-000:      #fff8f2 !default;
+$orange-100:      #ffebda !default;
+$orange-200:      #ffd1ac !default;
+$orange-300:      #ffab70 !default;
+$orange-400:      #fb8532 !default;
+$orange-500:      #f66a0a !default; // Default. passes AA Large with #fff
+$orange-600:      #e36209 !default;
+$orange-700:      #d15704 !default;
+$orange-800:      #c24e00 !default;
+$orange-900:      #a04100 !default;
+
+// -------- Red --------
+$red-000:         #ffeef0 !default;
+$red-100:         #ffdce0 !default;
+$red-200:         #fdaeb7 !default;
+$red-300:         #f97583 !default;
+$red-400:         #ea4a5a !default;
+$red-500:         #d73a49 !default; // Default. passes AA
+$red-600:         #cb2431 !default;
+$red-700:         #b31d28 !default;
+$red-800:         #9e1c23 !default;
+$red-900:         #86181d !default;
+
+// -------- Purple --------
+$purple-000:      #f5f0ff !default;
+$purple-100:      #e6dcfd !default;
+$purple-200:      #d1bcf9 !default;
+$purple-300:      #b392f0 !default;
+$purple-400:      #8a63d2 !default;
+$purple-500:      #6f42c1 !default; // passes AA with #fff
+$purple-600:      #5a32a3 !default;
+$purple-700:      #4c2889 !default;
+$purple-800:      #3a1d6e !default;
+$purple-900:      #29134e !default;
+
+// -------- Pink --------
+$pink-000:      #ffeef8 !default;
+$pink-100:      #fedbf0 !default;
+$pink-200:      #f9b3dd !default;
+$pink-300:      #f692ce !default;
+$pink-400:      #ec6cb9 !default;
+$pink-500:      #ea4aaa !default;
+$pink-600:      #d03592 !default;
+$pink-700:      #b93a86 !default;
+$pink-800:      #99306f !default;
+$pink-900:      #6d224f !default;
+
+// -------- Fades --------
+$black-fade-15:      rgba($black, 0.15) !default;
+$black-fade-30:      rgba($black, 0.3) !default;
+$black-fade-50:      rgba($black, 0.5) !default;
+$black-fade-70:      rgba($black, 0.7) !default;
+$black-fade-85:      rgba($black, 0.85) !default;
+
+$white-fade-15:      rgba($white, 0.15) !default;
+$white-fade-30:      rgba($white, 0.3) !default;
+$white-fade-50:      rgba($white, 0.5) !default;
+$white-fade-70:      rgba($white, 0.7) !default;
+$white-fade-85:      rgba($white, 0.85) !default;
+
+// -------- Color defaults --------
+$red:         $red-500 !default;
+$purple:      $purple-500 !default;
+$blue:        $blue-500 !default;
+$green:       $green-500 !default;
+$yellow:      $yellow-500 !default;
+$orange:      $orange-500 !default;
+
+$gray-dark:   $gray-900 !default;
+$gray-light:  $gray-400 !default;
+$gray:        $gray-500 !default;
+
+// -------- Color gradient maps --------
+
+$grays: (
+  0: $gray-000,
+  1: $gray-100,
+  2: $gray-200,
+  3: $gray-300,
+  4: $gray-400,
+  5: $gray-500,
+  6: $gray-600,
+  7: $gray-700,
+  8: $gray-800,
+  9: $gray-900,
+) !default;
+
+$blues: (
+  0: $blue-000,
+  1: $blue-100,
+  2: $blue-200,
+  3: $blue-300,
+  4: $blue-400,
+  5: $blue-500,
+  6: $blue-600,
+  7: $blue-700,
+  8: $blue-800,
+  9: $blue-900,
+) !default;
+
+$greens: (
+  0: $green-000,
+  1: $green-100,
+  2: $green-200,
+  3: $green-300,
+  4: $green-400,
+  5: $green-500,
+  6: $green-600,
+  7: $green-700,
+  8: $green-800,
+  9: $green-900,
+) !default;
+
+$yellows: (
+  0: $yellow-000,
+  1: $yellow-100,
+  2: $yellow-200,
+  3: $yellow-300,
+  4: $yellow-400,
+  5: $yellow-500,
+  6: $yellow-600,
+  7: $yellow-700,
+  8: $yellow-800,
+  9: $yellow-900,
+) !default;
+
+$oranges: (
+  0: $orange-000,
+  1: $orange-100,
+  2: $orange-200,
+  3: $orange-300,
+  4: $orange-400,
+  5: $orange-500,
+  6: $orange-600,
+  7: $orange-700,
+  8: $orange-800,
+  9: $orange-900,
+) !default;
+
+$reds: (
+  0: $red-000,
+  1: $red-100,
+  2: $red-200,
+  3: $red-300,
+  4: $red-400,
+  5: $red-500,
+  6: $red-600,
+  7: $red-700,
+  8: $red-800,
+  9: $red-900,
+) !default;
+
+$purples: (
+  0: $purple-000,
+  1: $purple-100,
+  2: $purple-200,
+  3: $purple-300,
+  4: $purple-400,
+  5: $purple-500,
+  6: $purple-600,
+  7: $purple-700,
+  8: $purple-800,
+  9: $purple-900,
+) !default;
+
+$pinks: (
+  0: $pink-000,
+  1: $pink-100,
+  2: $pink-200,
+  3: $pink-300,
+  4: $pink-400,
+  5: $pink-500,
+  6: $pink-600,
+  7: $pink-700,
+  8: $pink-800,
+  9: $pink-900,
+) !default;
+
+$hue-maps: (
+  "gray": $grays,
+  "blue": $blues,
+  "green": $greens,
+  "yellow": $yellows,
+  "orange": $oranges,
+  "red": $reds,
+  "purple": $purples,
+  "pink": $pinks,
+) !default;
diff --git a/assets/scss/_primer/support/variables/colors.scss b/assets/scss/_primer/support/variables/colors.scss
new file mode 100644
index 0000000..ffbf018
--- /dev/null
+++ b/assets/scss/_primer/support/variables/colors.scss
@@ -0,0 +1,63 @@
+@import "color-system.scss";
+// Color variables
+
+// Border colors
+$border-white:       $white !default;
+$border-black-fade:  $black-fade-15 !default;
+$border-white-fade:  $white-fade-15 !default;
+$border-gray-dark:   $gray-300 !default;
+$border-gray-darker: $gray-700 !default;
+$border-gray-light:  lighten($gray-200, 3%) !default;
+$border-gray:        $gray-200 !default;
+$border-blue:        $blue-500 !default;
+$border-blue-light:  $blue-200 !default;
+$border-green:       $green-400 !default;
+$border-green-light: desaturate($green-300, 40%) !default;
+$border-purple:      $purple !default;
+$border-red:         $red !default;
+$border-red-light:   desaturate($red-300, 60%) !default;
+$border-yellow:      desaturate($yellow-300, 60%) !default;
+
+// Buttons have a slightly more opaque border than $border-black-fade (15% alpha)
+$border-color-button: rgba($black, 0.2) !default;
+
+// Background colors
+$bg-white:          $white !default;
+$bg-black:          $black !default;
+$bg-black-fade:     $black-fade-50 !default;
+$bg-blue-light:     $blue-000 !default;
+$bg-blue:           $blue-500 !default;
+$bg-gray-dark:      $gray-900 !default;
+$bg-gray-light:     $gray-000 !default;
+$bg-gray:           $gray-100 !default;
+$bg-green:          $green-500 !default;
+$bg-green-light:    $green-100 !default;
+$bg-orange:         $orange-700 !default;
+$bg-purple:         $purple-500 !default;
+$bg-purple-light:   $purple-000 !default;
+$bg-pink:           $pink-500 !default;
+$bg-red:            $red-500 !default;
+$bg-red-light:      $red-100 !default;
+$bg-yellow:         $yellow-500 !default;
+$bg-yellow-light:   $yellow-200 !default;
+$bg-yellow-dark:    $yellow-700 !default;
+
+// diffstat background colors
+$bg-diffstat-added: darken($green-400, 5%) !default;
+$bg-diffstat-deleted: $red-600 !default;
+$bg-diffstat-neutral: $gray-300 !default;
+
+// Text colors
+$text-black:        $black !default;
+$text-white:        $white !default;
+$text-blue:         $blue-500 !default;
+$text-gray-dark:    $gray-900 !default;
+$text-gray-light:   $gray-500 !default;
+$text-gray:         $gray-600 !default;
+$text-green:        $green-500 !default;
+$text-orange:       $orange-900 !default;
+$text-orange-light: $orange-600 !default;
+$text-purple:       $purple !default;
+$text-pink:         $pink-500 !default;
+$text-red:          $red-600 !default;
+$text-yellow:       $yellow-800 !default;
diff --git a/assets/scss/_primer/support/variables/layout.scss b/assets/scss/_primer/support/variables/layout.scss
new file mode 100644
index 0000000..cec508c
--- /dev/null
+++ b/assets/scss/_primer/support/variables/layout.scss
@@ -0,0 +1,129 @@
+// Layout variables
+
+// these are values for the display CSS property
+$display-values: (
+  block,
+  flex,
+  inline,
+  inline-block,
+  inline-flex,
+  none,
+  table,
+  table-cell
+) !default;
+
+// maps edges to respective corners for border-radius
+$edges: (
+  top: (top-left, top-right),
+  right: (top-right, bottom-right),
+  bottom: (bottom-right, bottom-left),
+  left: (bottom-left, top-left)
+) !default;
+
+// These are our margin and padding utility spacers. The default step size we
+// use is 8px. This gives us a key of:
+//    0 => 0px
+//    1 => 4px
+//    2 => 8px
+//    3 => 16px
+//    4 => 24px
+//    5 => 32px
+//    6 => 40px
+$spacer: 8px !default;
+
+// Our spacing scale
+$spacer-0: 0 !default;                  // 0
+$spacer-1: round($spacer / 2) !default; // 4px
+$spacer-2: $spacer !default;            // 8px
+$spacer-3: $spacer * 2 !default;        // 16px
+$spacer-4: $spacer * 3 !default;        // 24px
+$spacer-5: $spacer * 4 !default;        // 32px
+$spacer-6: $spacer * 5 !default;        // 40px
+
+// The list of spacer values
+$spacers: (
+  $spacer-0,
+  $spacer-1,
+  $spacer-2,
+  $spacer-3,
+  $spacer-4,
+  $spacer-5,
+  $spacer-6,
+) !default;
+
+// And the map of spacers, for easier looping:
+// @each $scale, $length in $spacer-map { ... }
+$spacer-map: (
+  0: $spacer-0,
+  1: $spacer-1,
+  2: $spacer-2,
+  3: $spacer-3,
+  4: $spacer-4,
+  5: $spacer-5,
+  6: $spacer-6,
+) !default;
+
+// Em spacer variables
+$em-spacer-1: 0.0625em !default; // 1/16
+$em-spacer-2: 0.125em !default;  // 1/8
+$em-spacer-3: 0.25em !default;   // 1/4
+$em-spacer-4: 0.375em !default;  // 3/8
+$em-spacer-5: 0.5em !default;    // 1/2
+$em-spacer-6: 0.75em !default;   // 3/4
+
+// Fixed-width container variables
+$container-width: 980px !default;
+$grid-gutter:     10px !default;
+
+// Breakpoint widths
+$width-xs: 0 !default;
+// Small screen / phone
+$width-sm: 544px !default;
+// Medium screen / tablet
+$width-md: 768px !default;
+// Large screen / desktop (980 + (16 * 2)) <= container + gutters
+$width-lg: 1012px !default;
+// Extra large screen / wide desktop
+$width-xl: 1280px !default;
+
+// Responsive container widths
+$container-sm: $width-sm !default;
+$container-md: $width-md !default;
+$container-lg: $width-lg !default;
+$container-xl: $width-xl !default;
+
+// Breakpoints in the form (name: length)
+$breakpoints: (
+  sm: $width-sm,
+  md: $width-md,
+  lg: $width-lg,
+  xl: $width-xl
+) !default;
+
+// This map in the form (breakpoint: variant) is used to iterate over
+// breakpoints and create both responsive and non-responsive classes in one
+// loop:
+//
+// ```scss
+// @each $breakpoint, $variant of $responsive-variants {
+//   @include breakpoint($breakpoint) {
+//     .foo#{$variant}-bar { foo: bar !important; }
+//   }
+// }
+// ```
+$responsive-variants: (
+  "": "",
+  sm: "-sm",
+  md: "-md",
+  lg: "-lg",
+  xl: "-xl",
+) !default;
+
+// responive utility position values
+$responsive-positions: (
+  static,
+  relative,
+  absolute,
+  fixed,
+  sticky
+) !default;
diff --git a/assets/scss/_primer/support/variables/misc.scss b/assets/scss/_primer/support/variables/misc.scss
new file mode 100644
index 0000000..30a8363
--- /dev/null
+++ b/assets/scss/_primer/support/variables/misc.scss
@@ -0,0 +1,26 @@
+// Miscellaneous variables
+
+// Border size
+$border-width: 1px !default;
+$border-color: $border-gray !default;
+$border-style: solid !default;
+$border: $border-width $border-color $border-style !default;
+$border-radius: 3px !default;
+
+// Box shadow
+$box-shadow: 0 1px 1px rgba($black, 0.1) !default;
+$box-shadow-medium: 0 1px 5px $black-fade-15 !default;
+$box-shadow-large: 0 1px 15px $black-fade-15 !default;
+$box-shadow-extra-large: 0 10px 50px rgba($black, 0.07) !default;
+
+// Button and form variables
+$form-control-shadow: inset 0 1px 2px rgba($black, 0.075) !default;
+$btn-input-focus-shadow: 0 0 0 0.2em rgba($blue, 0.3) !default;
+$btn-active-shadow: inset 0 0.15em 0.3em $black-fade-15 !default;
+
+// Tooltips
+$tooltip-max-width: 250px !default;
+$tooltip-background-color: $black !default;
+$tooltip-text-color: $white !default;
+$tooltip-delay: 0.4s !default;
+$tooltip-duration: 0.1s !default;
diff --git a/assets/scss/_primer/support/variables/typography.scss b/assets/scss/_primer/support/variables/typography.scss
new file mode 100644
index 0000000..dcb57a7
--- /dev/null
+++ b/assets/scss/_primer/support/variables/typography.scss
@@ -0,0 +1,42 @@
+// Typography variables
+
+// Heading sizes - mobile
+// h4-h6 remain the same size on both mobile & desktop
+$h00-size-mobile: 40px !default;
+$h0-size-mobile: 32px !default;
+$h1-size-mobile: 26px !default;
+$h2-size-mobile: 22px !default;
+$h3-size-mobile: 18px !default;
+
+// Heading sizes - desktop
+$h00-size: 48px !default;
+$h0-size: 40px !default;
+$h1-size: 32px !default;
+$h2-size: 24px !default;
+$h3-size: 20px !default;
+$h4-size: 16px !default;
+$h5-size: 14px !default;
+$h6-size: 12px !default;
+
+$font-size-small: 12px !default;
+
+// Font weights
+$font-weight-bold: 600 !default;
+$font-weight-semibold: 500 !default;
+$font-weight-normal: 400 !default;
+$font-weight-light: 300 !default;
+
+// Line heights
+$lh-condensed-ultra: 1 !default;
+$lh-condensed: 1.25 !default;
+$lh-default: 1.5 !default;
+
+// Font stacks
+$body-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji" !default;
+
+// Monospace font stack
+$mono-font: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace !default;
+
+// The base body size
+$body-font-size: 14px !default;
+$body-line-height: $lh-default !default;
diff --git a/assets/scss/_primer/utilities/layout.scss b/assets/scss/_primer/utilities/layout.scss
new file mode 100644
index 0000000..1b4da95
--- /dev/null
+++ b/assets/scss/_primer/utilities/layout.scss
@@ -0,0 +1,87 @@
+// Layout
+// stylelint-disable block-opening-brace-space-after, block-opening-brace-space-before, comment-empty-line-before
+
+// Loop through the breakpoint values
+@each $breakpoint, $variant in $responsive-variants {
+  @include breakpoint($breakpoint) {
+    @each $position in $responsive-positions {
+      .position#{$variant}-#{$position} {
+        position: $position !important;
+      }
+    }
+  }
+}
+
+/* Set top 0 */
+.top-0    { top: 0 !important; }
+/* Set right 0 */
+.right-0  { right: 0 !important; }
+/* Set bottom 0 */
+.bottom-0 { bottom: 0 !important; }
+/* Set left 0 */
+.left-0   { left: 0 !important; }
+
+/* Vertical align middle */
+.v-align-middle      { vertical-align: middle !important; }
+/* Vertical align top */
+.v-align-top         { vertical-align: top !important; }
+/* Vertical align bottom */
+.v-align-bottom      { vertical-align: bottom !important; }
+/* Vertical align to the top of the text */
+.v-align-text-top    { vertical-align: text-top !important; }
+/* Vertical align to the bottom of the text */
+.v-align-text-bottom { vertical-align: text-bottom !important; }
+/* Vertical align to the parent's baseline */
+.v-align-baseline    { vertical-align: baseline !important; }
+
+// Overflow utilities
+@each $overflow in (visible, hidden, auto, scroll) {
+  .overflow-#{$overflow} { overflow: $overflow !important; }
+  .overflow-x-#{$overflow} { overflow-x: $overflow !important; }
+  .overflow-y-#{$overflow} { overflow-y: $overflow !important; }
+}
+
+// Clear floats
+/* Clear floats around the element */
+.clearfix {
+  @include clearfix;
+}
+
+// Floats
+@each $breakpoint, $variant in $responsive-variants {
+  @include breakpoint($breakpoint) {
+    /* Float to the left */
+    .float#{$variant}-left  { float: left !important; }
+    /* Float to the right */
+    .float#{$variant}-right  { float: right !important; }
+    /* No float */
+    .float#{$variant}-none { float: none !important; }
+  }
+}
+
+// Width and height utilities, helpful in combination
+// with display-table utilities and images
+/* Max width 100% */
+.width-fit   { max-width: 100% !important; }
+/* Set the width to 100% */
+.width-full  { width: 100% !important; }
+/* Max height 100% */
+.height-fit  { max-height: 100% !important; }
+/* Set the height to 100% */
+.height-full { height: 100% !important; }
+
+/* Remove min-width from element */
+.min-width-0 { min-width: 0 !important; }
+
+@each $breakpoint, $variant in $responsive-variants {
+  @include breakpoint($breakpoint) {
+
+    // Auto varients
+    .width#{$variant}-auto { width: auto !important; }
+
+    /* Set the direction to rtl */
+    .direction#{$variant}-rtl { direction: rtl !important; }
+    /* Set the direction to ltr */
+    .direction#{$variant}-ltr { direction: ltr !important; }
+  }
+}