diff --git a/_includes/author-profile.html b/_includes/author-profile.html
index 783bbc79..2748f24f 100644
--- a/_includes/author-profile.html
+++ b/_includes/author-profile.html
@@ -18,7 +18,7 @@
   </div>
 
   <div class="author__urls-wrapper">
-    <button class="btn btn--inverse btn--small">Follow</button>
+    <button class="btn btn--inverse">Follow</button>
     <ul class="author__urls social-icons">
       {% if author.uri %}
         <li><a href="{{ author.uri }}" target="_blank"><i class="fa fa-fw fa-globe"></i> {{ site.data.ui-text[site.locale].website_label }}</a></li>
diff --git a/_posts/2013-01-11-markup-html-tags-and-formatting.md b/_posts/2013-01-11-markup-html-tags-and-formatting.md
index c68f05a4..7394a1c3 100644
--- a/_posts/2013-01-11-markup-html-tags-and-formatting.md
+++ b/_posts/2013-01-11-markup-html-tags-and-formatting.md
@@ -131,14 +131,12 @@ Make any link standout more when applying the `.btn` class.
 [Large Button](#){: .btn .btn--large}
 [Default Button](#){: .btn}
 [Small Button](#){: .btn .btn--small}
-[X-Small Button](#){: .btn .btn--x-small}
 
 ```markdown
 [X-Large Button](#link){: .btn .btn--x-large}
 [Large Button](#link){: .btn .btn--large}
 [Default Button](#link){: .btn}
 [Small Button](#link){: .btn .btn--small}
-[X-Small Button](#link){: .btn .btn--x-small}
 ```
 
 ## Notices
diff --git a/assets/_scss/_archive.scss b/assets/_scss/_archive.scss
index 6cd64548..0373ec38 100644
--- a/assets/_scss/_archive.scss
+++ b/assets/_scss/_archive.scss
@@ -23,21 +23,25 @@
 }
 
 .archive__subtitle {
-  margin: 2em 0 0;
+  margin: 1.414em 0 0;
   padding-bottom: 0.5em;
-  font-size: 14px;
+  font-size: $type-size-5;
   color: mix(#fff, $gray, 25%);
   border-bottom: 1px solid $border-color;
+
+  + .list__item .archive__item-title {
+    margin-top: 0.5em;
+  }
 }
 
 .archive__item-title {
-  margin-bottom: 4px;
+  margin-bottom: 0.25em;
   font-family: $sans-serif-narrow;
-  font-size: 20px;
+  font-size: $type-size-5;
 }
 
 .archive__item-excerpt {
-  font-size: 14px;
+  font-size: $type-size-6;
 
   & + p {
     text-indent: 0;
@@ -97,6 +101,11 @@ a:hover {
     margin: 0 0 4px;
   }
 
+  .archive__item-title {
+    margin-top: 0.5em;
+    font-size: $type-size-5;
+  }
+
   .archive__item-excerpt {
     display: none;
   }
@@ -119,6 +128,7 @@ a:hover {
 
     .archive__item-excerpt {
       display: block;
+      font-size: $type-size-6;
     }
   }
 }
@@ -149,15 +159,15 @@ a:hover {
 
   .archive__item-title {
     margin-bottom: 0.5em;
-    font-size: 30px;
+    font-size: $type-size-4;
   }
 
   .archive__item-excerpt {
     margin-bottom: 1em;
-    font-size: 18px;
+    font-size: $type-size-5;
 
     p {
-      font-size: 18px;
+      font-size: $type-size-5;
     }
   }
 
@@ -179,15 +189,15 @@ a:hover {
 
     .archive__item-title {
       margin-bottom: 0.5em;
-      font-size: 30px;
+      font-size: $type-size-4;
     }
 
     .archive__item-excerpt {
       margin-bottom: 1em;
-      font-size: 18px;
+      font-size: $type-size-5;
 
       p {
-        font-size: 18px;
+        font-size: $type-size-5;
       }
     }
   }
@@ -211,15 +221,15 @@ a:hover {
 
     .archive__item-title {
       margin-bottom: 0.5em;
-      font-size: 30px;
+      font-size: $type-size-4;
     }
 
     .archive__item-excerpt {
       margin-bottom: 1em;
-      font-size: 18px;
+      font-size: $type-size-5;
 
       p {
-        font-size: 18px;
+        font-size: $type-size-5;
       }
     }
   }
@@ -243,15 +253,15 @@ a:hover {
 
     .archive__item-title {
       margin-bottom: 0.5em;
-      font-size: 30px;
+      font-size: $type-size-4;
     }
 
     .archive__item-excerpt {
       margin-bottom: 1em;
-      font-size: 18px;
+      font-size: $type-size-5;
 
       p {
-        font-size: 18px;
+        font-size: $type-size-5;
       }
     }
   }
diff --git a/assets/_scss/_base.scss b/assets/_scss/_base.scss
index c3f98586..8b9e915e 100644
--- a/assets/_scss/_base.scss
+++ b/assets/_scss/_base.scss
@@ -7,7 +7,7 @@ body {
   padding: 0;
   color: $text-color;
   font-family: $serif;
-  line-height: 1.5;
+  line-height: 1.45;
   background-color: $background-color;
 
   &.overflow--hidden {
@@ -17,36 +17,42 @@ body {
 }
 
 h1, h2, h3, h4, h5, h6 {
-  line-height: 1.25;
+  margin: 1.414em 0 0.5em;
+  line-height: 1.2;
   font-family: $sans-serif;
 }
 
 h1 {
-  font-size: 32px;
+  margin-top: 0;
+  font-size: $type-size-3;
 }
 
 h2 {
-  font-size: 28px;
+  font-size: $type-size-4;
 }
 
 h3 {
-  font-size: 24px;
+  font-size: $type-size-5;
 }
 
 h4 {
-  font-size: 18px;
+  font-size: $type-size-6;
 }
 
 h5 {
-  font-size: 16px;
+  font-size: $type-size-6;
 }
 
 h6 {
-  font-size: 14px;
+  font-size: $type-size-6;
 }
 
 small {
-  font-size: 0.8rem;
+  font-size: $type-size-6;
+}
+
+p {
+  margin-bottom: 1.3em;
 }
 
 u,
@@ -93,7 +99,7 @@ blockquote {
 
   cite {
     font-family: $sans-serif;
-    font-size: 14px;
+    font-size: $type-size-6;
     font-style: normal;
 
     &:before {
@@ -126,18 +132,18 @@ a {
 
 tt, code, kbd, samp, pre {
   font-family: $monospace;
-  font-size: 12px;
 }
 
 pre {
   overflow-x: auto; // add scrollbars to wide code blocks
 }
 
-p code,
-li code,
-figcaption code {
+p > code,
+li > code,
+figcaption > code {
   padding-top: 0.1rem;
   padding-bottom: 0.1rem;
+  font-size: $type-size-6;
   background: $code-background-color;
   border: 1px solid $lighter-gray;
   border-radius: $border-radius;
@@ -216,10 +222,10 @@ figure {
 /* Figure captions */
 
 figcaption {
-  margin-bottom: 0.65rem;
+  margin-bottom: 0.5em;
   color: mix(#fff, $text-color, 25%);
   font-family: $sans-serif;
-  font-size: 0.8rem;
+  font-size: $type-size-6;
 
   a {
     color: inherit;
@@ -232,10 +238,6 @@ figcaption {
       border-bottom-color: #000;
     }
   }
-
-  code {
-    font-size: 0.64rem;
-  }
 }
 
 
diff --git a/assets/_scss/_buttons.scss b/assets/_scss/_buttons.scss
index 9f95ff95..d01e468f 100644
--- a/assets/_scss/_buttons.scss
+++ b/assets/_scss/_buttons.scss
@@ -13,9 +13,8 @@
   padding: 0.5em 1em;
   color: #fff !important;
   font-family: $sans-serif;
-  font-size: 14px;
+  font-size: $type-size-6;
   font-weight: bold;
-  line-height: 1.5;
   text-align: center;
   text-decoration: none;
   background-color: $primary-color;
@@ -137,24 +136,18 @@
   /* extra large button */
 
   &--x-large {
-    font-size: 24px;
+    font-size: $type-size-3;
   }
 
   /* large button */
 
   &--large {
-    font-size: 18px;
+    font-size: $type-size-4;
   }
 
   /* small button */
 
   &--small {
-    font-size: 12px;
-  }
-
-  /* extra small button */
-  &--x-small {
-    font-size: 10px;
-    font-weight: normal;
+    font-size: $type-size-7;
   }
 }
\ No newline at end of file
diff --git a/assets/_scss/_footer.scss b/assets/_scss/_footer.scss
index b01d7c19..a3fef4e6 100644
--- a/assets/_scss/_footer.scss
+++ b/assets/_scss/_footer.scss
@@ -35,7 +35,7 @@
     @include prefix(2.5 of 12);
   }
 
-  font-size: 14px;
+  font-size: $type-size-6;
 }
 
 .page__footer-follow {
@@ -58,7 +58,7 @@
     padding-top: 5px;
     padding-bottom: 5px;
     font-family: $sans-serif-narrow;
-    font-size: 14px;
+    font-size: $type-size-6;
     text-transform: uppercase;
   }
 
diff --git a/assets/_scss/_forms.scss b/assets/_scss/_forms.scss
index 329f2bc2..42b9a280 100644
--- a/assets/_scss/_forms.scss
+++ b/assets/_scss/_forms.scss
@@ -336,7 +336,7 @@ select:focus {
   margin-bottom: 20px;
   padding: 8px 20px;
   display: inline-block;
-  font-size: 14px;
+  font-size: $type-size-6;
   background-color: #fff;
   color: #000;
   border-width: 2px !important;
diff --git a/assets/_scss/_masthead.scss b/assets/_scss/_masthead.scss
index f0309e09..0b92e416 100644
--- a/assets/_scss/_masthead.scss
+++ b/assets/_scss/_masthead.scss
@@ -38,7 +38,7 @@
     @include prefix(2.5 of 12);
   }
 
-  font-size: 24px;
+  font-size: $type-size-5;
 }
 
 .masthead__menu {
@@ -61,6 +61,6 @@
 .masthead__menu-item {
   display: block;
   list-style-type: none;
-  font-size: 16px;
+  font-size: $type-size-6;
   white-space: nowrap;
 }
\ No newline at end of file
diff --git a/assets/_scss/_navigation.scss b/assets/_scss/_navigation.scss
index ce8724b5..8d37b8fb 100644
--- a/assets/_scss/_navigation.scss
+++ b/assets/_scss/_navigation.scss
@@ -27,7 +27,7 @@
   ol {
     padding: 0;
     list-style: none;
-    font-size: 14px;
+    font-size: $type-size-6;
 
     @include breakpoint($large) {
       @include span(10 of 12 last);
@@ -63,7 +63,6 @@
     padding: 0;
     list-style-type: none;
     font-family: $sans-serif;
-    font-size: 12px;
   }
 
   li {
@@ -123,9 +122,8 @@
     float: left;
     width: 50%;
     font-family: $sans-serif;
-    font-size: 18px;
+    font-size: $type-size-5;
     font-weight: bold;
-    line-height: 1.5;
     text-align: center;
     text-decoration: none;
     color: mix(#fff, $gray, 25%);
@@ -257,7 +255,7 @@
     a {
       margin: 0;
       padding: 10px 20px;
-      font-size: 0.8em;
+      font-size: $type-size-5;
 
       &:hover {
         color: #000;
@@ -308,6 +306,8 @@
    ========================================================================== */
 
 .nav__list {
+  font-size: 1.5rem;
+
   a {
     display: block;
     padding: 4px 0;
@@ -327,7 +327,7 @@
   margin: 0;
   padding: 10px 20px;
   font-family: $sans-serif-narrow;
-  font-size: 16px;
+  font-size: $type-size-5;
   font-weight: bold;
   border-bottom: 1px solid $border-color;
 }
@@ -337,7 +337,7 @@
   margin: 10px 0;
   padding: 10px 0;
   font-family: $sans-serif-narrow;
-  font-size: 16px;
+  font-size: $type-size-5;
   font-weight: bold;
   border-bottom: 1px solid $border-color;
 }
diff --git a/assets/_scss/_notices.scss b/assets/_scss/_notices.scss
index c9d8eae8..73b97de1 100644
--- a/assets/_scss/_notices.scss
+++ b/assets/_scss/_notices.scss
@@ -26,7 +26,7 @@
   @at-root .page__content #{&} h4 {
     // using at-root to override .page-content h4 font size
     margin-bottom: 0;
-    font-size: 1rem;
+    font-size: 1em;
   }
 
   @at-root .page__content #{&} a {
diff --git a/assets/_scss/_page.scss b/assets/_scss/_page.scss
index 62e7dc44..5a74b5b9 100644
--- a/assets/_scss/_page.scss
+++ b/assets/_scss/_page.scss
@@ -35,7 +35,6 @@
     .page__content,
     .page__meta,
     .page__share {
-      @include clearfix();
       @include full();
     }
   }
@@ -44,20 +43,21 @@
 .page__title {
   margin-top: 0;
   font-family: $serif;
+  font-weight: normal;
   line-height: 1;
   & + .page__meta {
-    margin-top: -1.5em;
+    margin-top: -0.5em;
   }
 }
 
 .page__lead {
   font-family: $sans-serif;
-  font-size: 20px;
+  font-size: $type-size-4;
 }
 
 .page__content {
   p, li, dl {
-    font-size: 16px;
+    font-size: 1em;
   }
 
   /* paragraph indents */
@@ -112,10 +112,10 @@
     }
 
     .page__title {
-      font-size: 48px;
+      font-size: $type-size-2;
 
       @include breakpoint($small) {
-        font-size: 60px;
+        font-size: $type-size-1;
       }
     }
 
@@ -139,7 +139,7 @@
   padding: 2px 5px;
   color: #fff;
   font-family: $sans-serif;
-  font-size: 10px;
+  font-size: $type-size-7;
   background: #000;
   text-align: right;
   z-index: 5;
@@ -167,8 +167,8 @@
 }
 
 .page__share-title {
-  font-size: 14px;
   margin-bottom: 10px;
+  font-size: $type-size-6;
   text-transform: uppercase;
 }
 
@@ -181,7 +181,7 @@
   margin-top: 2em;
   color: mix(#fff, $gray, 25%);
   font-family: $sans-serif;
-  font-size: 14px;
+  font-size: $type-size-6;
 
   p {
     margin-bottom: 0.5em;
@@ -189,8 +189,8 @@
 }
 
 .page__meta-title {
-  font-size: 14px;
   margin-bottom: 10px;
+  font-size: $type-size-6;
   text-transform: uppercase;
 }
 
@@ -230,15 +230,14 @@
    ========================================================================== */
 
 .page__comments {
-  @include clearfix();
   @include full();
 }
 
 .page__comments-title {
-  font-size: 14px;
   margin-top: 2rem;
   margin-bottom: 10px;
   padding-top: 2rem;
+  font-size: $type-size-6;
   border-top: 1px solid $border-color;
   text-transform: uppercase;
 }
@@ -269,7 +268,7 @@
 }
 
 .page__related-title {
-  font-size: 14px;
   margin-bottom: 10px;
+  font-size: $type-size-6;
   text-transform: uppercase;
 }
\ No newline at end of file
diff --git a/assets/_scss/_reset.scss b/assets/_scss/_reset.scss
index 90f699df..d7a4bd18 100644
--- a/assets/_scss/_reset.scss
+++ b/assets/_scss/_reset.scss
@@ -8,13 +8,9 @@ html {
   /* apply a natural box layout model to all elements */
   box-sizing: border-box;
   background-color: $background-color;
-  font-size: 15px;
+  font-size: 16px;
 
   @include breakpoint($medium) {
-    font-size: 16px;
-  }
-
-  @include breakpoint($large) {
     font-size: 18px;
   }
 
diff --git a/assets/_scss/_sidebar.scss b/assets/_scss/_sidebar.scss
index da46eafe..a15ec469 100644
--- a/assets/_scss/_sidebar.scss
+++ b/assets/_scss/_sidebar.scss
@@ -24,17 +24,17 @@
   }
 
   h3 {
-    font-size: 20px;
+    font-size: $type-size-4;
   }
 
   h4 {
-    font-size: 18px;
+    font-size: $type-size-4;
   }
 
   p, li {
     font-family: $sans-serif;
-    font-size: 12px;
-    line-height: 1.2;
+    font-size: $type-size-6;
+    line-height: 1.45;
   }
 
   img {
@@ -108,16 +108,15 @@
 }
 .sidebar .author__name {
   font-family: $sans-serif;
-  font-size: 16px;
+  font-size: $type-size-5;
 
   @include breakpoint($large) {
-    font-size: 18px;
+    font-size: $type-size-4;
   }
 }
 
 .author__bio {
   margin: 0;
-  font-size: 12px;
 
   @include breakpoint($large) {
     margin-top: 10px;
@@ -213,7 +212,7 @@
     padding-right: 5px;
     padding-top: 2px;
     padding-bottom: 2px;
-    font-size: 14px;
+    font-size: $type-size-5;
     text-decoration: none;
     white-space: nowrap;
 
diff --git a/assets/_scss/_syntax.scss b/assets/_scss/_syntax.scss
index c4812464..d836ae24 100644
--- a/assets/_scss/_syntax.scss
+++ b/assets/_scss/_syntax.scss
@@ -12,8 +12,8 @@ div.highlighter-rouge, figure.highlight {
   .highlight {
     margin: 0;
     font-family: $monospace;
-    font-size: 12px;
-    line-height: 1.5;
+    font-size: $type-size-6;
+    line-height: 1.45;
   }
 }
 
diff --git a/assets/_scss/_tables.scss b/assets/_scss/_tables.scss
index 1f63e58c..40d89ae5 100644
--- a/assets/_scss/_tables.scss
+++ b/assets/_scss/_tables.scss
@@ -5,7 +5,7 @@
 table {
   width: 100%;
   font-family: $sans-serif;
-  font-size: 0.8rem;
+  font-size: $type-size-6;
   border-collapse: collapse;
   border-bottom: 2px solid $border-color;
 
diff --git a/assets/_scss/_utilities.scss b/assets/_scss/_utilities.scss
index 048e3c97..f21d3ed1 100644
--- a/assets/_scss/_utilities.scss
+++ b/assets/_scss/_utilities.scss
@@ -360,7 +360,7 @@ $navicon-height : 4px;
 .footnotes {
   ol, li, p {
     margin-bottom: 0;
-    font-size: 14px;
+    font-size: $type-size-6;
   }
 }
 
diff --git a/assets/_scss/_variables.scss b/assets/_scss/_variables.scss
index f3171d3f..a60d874a 100644
--- a/assets/_scss/_variables.scss
+++ b/assets/_scss/_variables.scss
@@ -7,11 +7,10 @@
    ========================================================================== */
 
 $doc-font-size              : 16;
-$doc-line-height            : 26;
 
 /* paragraph indention */
 $paragraph-indent           : false; // true, false (default)
-$indent-var                 : 0rem + ($doc-line-height / $doc-font-size);
+$indent-var                 : 1.3em;
 
 /* system typefaces */
 $serif                      : Georgia, Times, serif;
@@ -29,6 +28,16 @@ $bodoni                     : "Bodoni MT", serif;
 $calisto                    : "Calisto MT", serif;
 $garamond                   : Garamond, serif;
 
+/* type scale */
+$type-size-1                : 3.998em;
+$type-size-2                : 2.827em;
+$type-size-3                : 1.999em;
+$type-size-4                : 1.414em;
+$type-size-5                : 1em;
+$type-size-6                : 0.707em;
+$type-size-7                : 0.5em;
+$type-size-8                : 0.354em;
+
 
 /*
    Colors
@@ -41,7 +50,7 @@ $lighter-gray               : mix(#fff, $gray, 90%);
 
 $body-color                 : #fff;
 $background-color           : #f5f5f5;
-$code-background-color      : #f8f8f8;
+$code-background-color      : #fff;
 $text-color                 : #333332;
 $border-color               : $lighter-gray;
 $base-color                 : #343434;
diff --git a/assets/css/main.css b/assets/css/main.css
index c9472ba1..83fb96dd 100644
--- a/assets/css/main.css
+++ b/assets/css/main.css
@@ -1,4 +1,4 @@
-a:focus{outline:thin dotted #dd8338;outline:5px auto #dd8338;outline-offset:-2px}*,*:before,*:after{box-sizing:border-box}html{box-sizing:border-box;background-color:#f5f5f5;font-size:15px;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}@media (min-width: 48em){html{font-size:16px}}@media (min-width: 64em){html{font-size:18px}}body{margin:0}::-moz-selection{color:#fff;background:#000}::selection{color:#fff;background:#000}article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}audio,canvas,video{display:inline-block;*display:inline;*zoom:1}audio:not([controls]){display:none}a{color:inherit}a:hover,a:active{outline:0}sub,sup{position:relative;font-size:75%;line-height:0;vertical-align:baseline}sup{top:-0.5em}sub{bottom:-0.25em}img{max-width:100%;width:auto\9;height:auto;vertical-align:middle;border:0;-ms-interpolation-mode:bicubic}#map_canvas img,.google-maps img{max-width:none}button,input,select,textarea{margin:0;font-size:100%;vertical-align:middle}button,input{*overflow:visible;line-height:normal}button::-moz-focus-inner,input::-moz-focus-inner{padding:0;border:0}button,html input[type="button"],input[type="reset"],input[type="submit"]{-webkit-appearance:button;cursor:pointer}label,select,button,input[type="button"],input[type="reset"],input[type="submit"],input[type="radio"],input[type="checkbox"]{cursor:pointer}input[type="search"]{box-sizing:content-box;-webkit-appearance:textfield}input[type="search"]::-webkit-search-decoration,input[type="search"]::-webkit-search-cancel-button{-webkit-appearance:none}textarea{overflow:auto;vertical-align:top}body{margin:0;padding:0;color:#333332;font-family:Georgia,Times,serif;line-height:1.5;background-color:#f5f5f5}body.overflow--hidden{overflow:hidden}h1,h2,h3,h4,h5,h6{line-height:1.25;font-family:-apple-system,".SFNSText-Regular","San Francisco","Roboto","Segoe UI","Helvetica Neue","Lucida 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