Use Jekyll native Sass/SCSS preprocessor

- Move .scss files to default `_sass` folder
- Configure Sass/SCSS in `_config.yml`
- Run .scss files through Autoprefixer
- Remove unnecessary npm scripts for building CSS
- Close #333

_config.yml

@@ -145,6 +145,12 @@ kramdown:
   enable_coderay: false
 
 
+# Sass/SCSS
+sass:
+  sass_dir: _sass
+  style: compressed # http://sass-lang.com/documentation/file.SASS_REFERENCE.html#output_style
+
+
 # Outputting
 permalink: /:categories/:title/
 paginate: 5 # amount of posts to show

_sass/_animations.scss

@@ -2,6 +2,15 @@
    ANIMATIONS
    ========================================================================== */
 
+@-webkit-keyframes intro {
+  0% {
+    opacity: 0;
+  }
+  100% {
+    opacity: 1;
+  }
+}
+
 @keyframes intro {
   0% {
     opacity: 0;

_sass/_archive.scss

@@ -41,7 +41,7 @@
   }
 }
 
-// remove border
+/* remove border*/
 .page__content {
 
   .archive__item-title {
@@ -129,8 +129,8 @@
   }
 
   @include breakpoint($medium) {
-    margin-left: 0; // reset before mixin does its thing
-    margin-right: 0; // reset before mixin does its thing
+    margin-left: 0; /* reset before mixin does its thing*/
+    margin-right: 0; /* reset before mixin does its thing*/
     @include gallery(2.5 of 10);
 
     .archive__item-teaser {

_sass/_base.scss

@@ -129,7 +129,7 @@ tt, code, kbd, samp, pre {
 }
 
 pre {
-  overflow-x: auto; // add scrollbars to wide code blocks
+  overflow-x: auto; /* add scrollbars to wide code blocks*/
 }
 
 p > code,
@@ -147,7 +147,7 @@ td > code {
 
   &:before, &:after {
     letter-spacing: -0.2em;
-    content: "\00a0"; // non-breaking space
+    content: "\00a0"; /* non-breaking space*/
   }
 }
 
@@ -179,9 +179,12 @@ li ol {
 /* Figures and images */
 
 figure {
+  display: -webkit-box;
   display: flex;
-  justify-content: space-between;
-  align-items: flex-start;
+  -webkit-box-pack: justify;
+          justify-content: space-between;
+  -webkit-box-align: start;
+          align-items: flex-start;
   flex-wrap: wrap;
   margin: 2em 0;
 
@@ -194,6 +197,7 @@ figure {
   img {
     width: 100%;
     border-radius: $border-radius;
+    -webkit-transition: $global-transition;
     transition: $global-transition;
   }
 
@@ -240,6 +244,7 @@ figcaption {
     color: inherit;
     text-decoration: none;
     border-bottom: 1px solid $light-gray;
+    -webkit-transition: $global-transition;
     transition: $global-transition;
 
     &:hover {
@@ -305,5 +310,6 @@ nav {
    ========================================================================== */
 
 b, i, strong, em, blockquote, p, q, span, figure, img, h1, h2, header, input, a, tr, td, form button, input[type="submit"], .btn, .highlight, .archive__item-teaser {
+  -webkit-transition: $global-transition;
   transition: $global-transition;
 }

_sass/_buttons.scss

@@ -31,7 +31,7 @@
   }
 
   .icon + .hidden {
-    margin-left: -0.5em; // override for hidden text
+    margin-left: -0.5em; /* override for hidden text*/
   }
 
   /* fills width of parent container */
@@ -49,7 +49,7 @@
 
   &--inverse {
     color: $gray !important;
-    border: 1px solid $light-gray !important; // override
+    border: 1px solid $light-gray !important; /* override*/
     background-color: #fff;
 
     &:hover {
@@ -61,7 +61,7 @@
   /* light outline */
 
   &--light-outline {
-    border: 1px solid #fff !important; // override
+    border: 1px solid #fff !important; /* override*/
     background-color: transparent;
   }
 
@@ -111,7 +111,6 @@
     pointer-events: none;
     cursor: not-allowed;
     filter: alpha(opacity=65);
-    -webkit-box-shadow: none;
     box-shadow: none;
     opacity: 0.65;
   }

_sass/_footer.scss

@@ -14,8 +14,10 @@
   /* sticky footer fix end */
   margin-top: 3em;
   color: mix(#fff, $gray, 25%);
-  animation: intro 0.3s both;
-  animation-delay: 0.45s;
+  -webkit-animation: intro 0.3s both;
+          animation: intro 0.3s both;
+  -webkit-animation-delay: 0.45s;
+          animation-delay: 0.45s;
   background-color: $lighter-gray;
   border-top: 1px solid $light-gray;
 

_sass/_masthead.scss

@@ -5,8 +5,10 @@
 .masthead {
   position: relative;
   border-bottom: 1px solid $border-color;
-  animation: intro 0.3s both;
-  animation-delay: 0.15s;
+  -webkit-animation: intro 0.3s both;
+          animation: intro 0.3s both;
+  -webkit-animation-delay: 0.15s;
+          animation-delay: 0.15s;
   z-index: 20;
 
   &__inner-wrap {

_sass/_mixins.scss

@@ -3,9 +3,9 @@
    ========================================================================== */
 
 %tab-focus {
-  // Default
+  /* Default*/
   outline: thin dotted $warning-color;
-  // Webkit
+  /* Webkit*/
   outline: 5px auto $warning-color;
   outline-offset: -2px;
 }
@@ -23,21 +23,24 @@
    Bourbon clearfix
    ========================================================================== */
 
-// Provides an easy way to include a clearfix for containing floats.
-//
-// @link http://cssmojo.com/latest_new_clearfix_so_far/
-//
-// @example scss - Usage
-//   .element {
-//     @include clearfix;
-//   }
-//
-// @example css - CSS Output
-//   .element::after {
-//     clear: both;
-//     content: "";
-//     display: table;
-//   }
+/*
+  * Provides an easy way to include a clearfix for containing floats.
+  * link http://cssmojo.com/latest_new_clearfix_so_far/
+  *
+  * example scss - Usage
+  *
+  * .element {
+  *   @include clearfix;
+  * }
+  *
+  * example css - CSS Output
+  *
+  * .element::after {
+  *   clear: both;
+  *   content: "";
+  *   display: table;
+  * }
+*/
 
 @mixin clearfix {
   clear: both;

_sass/_navigation.scss

@@ -14,8 +14,10 @@
   padding-left: 2em;
   padding-right: 2em;
   font-family: $sans-serif;
-  animation: intro 0.3s both;
-  animation-delay: 0.30s;
+  -webkit-animation: intro 0.3s both;
+          animation: intro 0.3s both;
+  -webkit-animation-delay: 0.30s;
+          animation-delay: 0.30s;
 
   @include breakpoint($large) {
     padding-left: 1em;
@@ -232,12 +234,17 @@
         height: 4px;
         background: mix(#fff, $primary-color, 50%);
         width: 100%;
+        -webkit-transition: $global-transition;
         transition: $global-transition;
-        transform: scaleX(0); // hide
+        -webkit-transform: scaleX(0);
+            -ms-transform: scaleX(0);
+                transform: scaleX(0); /* hide*/
       }
 
       &:hover:before {
-        transform: scaleX(1); // reveal
+        -webkit-transform: scaleX(1);
+            -ms-transform: scaleX(1);
+                transform: scaleX(1); /* reveal*/
       }
     }
   }
@@ -414,7 +421,7 @@
     font-weight: normal;
   }
 
-  // hide sub sub links on small screens
+  /* hide sub sub links on small screens*/
   li > ul li {
     display: none;
 

_sass/_notices.scss

@@ -11,34 +11,34 @@
  */
 
 @mixin notice($notice-color) {
-  margin: 2em 0 !important;  // override
+  margin: 2em 0 !important;  /* override*/
   padding: 1em;
   font-family: $global-font-family;
   font-size: $type-size-6 !important;
-  text-indent: initial; // override
+  text-indent: initial; /* override*/
   background-color: mix(#fff, $notice-color, 90%);
   border-radius: $border-radius;
   box-shadow: 0 1px 1px rgba($notice-color, 0.25);
 
   h4 {
-    margin-top: 0 !important; // override
+    margin-top: 0 !important; /* override*/
     margin-bottom: 0.75em;
   }
 
   @at-root .page__content #{&} h4 {
-    // using at-root to override .page-content h4 font size
+    /* using at-root to override .page-content h4 font size*/
     margin-bottom: 0;
     font-size: 1em;
   }
 
   p {
     &:last-child {
-      margin-bottom: 0 !important; // override
+      margin-bottom: 0 !important; /* override*/
     }
   }
 
   h4 + p {
-    // remove space above paragraphs that appear directly after notice headline
+    /* remove space above paragraphs that appear directly after notice headline*/
     margin-top: 0;
     padding-top: 0;
   }
@@ -57,7 +57,7 @@
 
   ul {
     &:last-child {
-      margin-bottom: 0; // override
+      margin-bottom: 0; /* override*/
     }
   }
 }

_sass/_page.scss

@@ -8,8 +8,10 @@
   margin-top: 2em;
   padding-left: 1em;
   padding-right: 1em;
-  animation: intro 0.3s both;
-  animation-delay: 0.35s;
+  -webkit-animation: intro 0.3s both;
+          animation: intro 0.3s both;
+  -webkit-animation-delay: 0.35s;
+          animation-delay: 0.35s;
 
   @include breakpoint($x-large) {
     max-width: $x-large;
@@ -63,7 +65,7 @@
   p {
     margin: 0 0 $indent-var;
 
-    // sibling indentation
+    /* sibling indentation*/
     @if $paragraph-indent == true {
       & + p {
         text-indent: $indent-var;
@@ -111,8 +113,10 @@
   position: relative;
   margin-bottom: 2em;
   @include clearfix;
-  animation: intro 0.3s both;
-  animation-delay: 0.25s;
+  -webkit-animation: intro 0.3s both;
+          animation: intro 0.3s both;
+  -webkit-animation-delay: 0.25s;
+          animation-delay: 0.25s;
 
   &--overlay {
     position: relative;
@@ -122,8 +126,10 @@
     background-size: cover;
     background-repeat: no-repeat;
     background-position: center;
-    animation: intro 0.3s both;
-    animation-delay: 0.25s;
+    -webkit-animation: intro 0.3s both;
+            animation: intro 0.3s both;
+    -webkit-animation-delay: 0.25s;
+            animation-delay: 0.25s;
 
     a {
       color: #fff;

_sass/_reset.scss

@@ -24,6 +24,11 @@ body { margin: 0; }
 
 /* Selected elements */
 
+::-moz-selection {
+  color: #fff;
+  background: #000;
+}
+
 ::selection {
   color: #fff;
   background: #000;
@@ -100,9 +105,9 @@ sub {
 
 img {
   /* Responsive images (ensure images don't scale beyond their parents) */
-  max-width: 100%; // part 1: Set a maximum relative to the parent
-  width: auto\9; // IE7-8 need help adjusting responsive images
-  height: auto; // part 2: Scale the height according to the width, otherwise you get stretching
+  max-width: 100%; /* part 1: Set a maximum relative to the parent*/
+  width: auto\9; /* IE7-8 need help adjusting responsive images*/
+  height: auto; /* part 2: Scale the height according to the width, otherwise you get stretching*/
 
   vertical-align: middle;
   border: 0;
@@ -129,12 +134,12 @@ textarea {
 
 button,
 input {
-  *overflow: visible; // inner spacing ie IE6/7
-  line-height: normal; // FF3/4 have !important on line-height in UA stylesheet
+  *overflow: visible; /* inner spacing ie IE6/7*/
+  line-height: normal; /* FF3/4 have !important on line-height in UA stylesheet*/
 }
 
 button::-moz-focus-inner,
-input::-moz-focus-inner { // inner padding and border oddities in FF3/4
+input::-moz-focus-inner { /* inner padding and border oddities in FF3/4*/
   padding: 0;
   border: 0;
 }
@@ -143,8 +148,8 @@ button,
 html input[type="button"], // avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio` and `video` controls
 input[type="reset"],
 input[type="submit"] {
-    -webkit-appearance: button; // corrects inability to style clickable `input` types in iOS
-    cursor: pointer; // improves usability and consistency of cursor style between image-type `input` and others
+    -webkit-appearance: button; /* corrects inability to style clickable `input` types in iOS*/
+    cursor: pointer; /* improves usability and consistency of cursor style between image-type `input` and others*/
 }
 
 label,
@@ -155,20 +160,20 @@ input[type="reset"],
 input[type="submit"],
 input[type="radio"],
 input[type="checkbox"] {
-    cursor: pointer; // improves usability and consistency of cursor style between image-type `input` and others
+    cursor: pointer; /* improves usability and consistency of cursor style between image-type `input` and others*/
 }
 
-input[type="search"] { // Appearance in Safari/Chrome
+input[type="search"] { /* Appearance in Safari/Chrome*/
   box-sizing: content-box;
   -webkit-appearance: textfield;
 }
 
 input[type="search"]::-webkit-search-decoration,
 input[type="search"]::-webkit-search-cancel-button {
-  -webkit-appearance: none; // inner-padding issues in Chrome OSX, Safari 5
+  -webkit-appearance: none; /* inner-padding issues in Chrome OSX, Safari 5*/
 }
 
 textarea {
-  overflow: auto; // remove vertical scrollbar in IE6-9
-  vertical-align: top; // readability and alignment cross-browser
+  overflow: auto; /* remove vertical scrollbar in IE6-9*/
+  vertical-align: top; /* readability and alignment cross-browser*/
 }

_sass/_sidebar.scss

@@ -13,6 +13,7 @@
   @include breakpoint($large) {
     @include span(2 of 12);
     opacity: 0.75;
+    -webkit-transition: opacity 0.2s ease-in-out;
     transition: opacity 0.2s ease-in-out;
 
     &:hover {

_sass/_utilities.scss

@@ -179,7 +179,7 @@ body:hover .visually-hidden button {
   vertical-align: middle;
 }
 
-// social icons
+/* social icons*/
 
 .social-icons {
   .fa {
@@ -295,6 +295,7 @@ body:hover .visually-hidden button {
   height: $navicon-height;
   background: #fff;
   margin: auto;
+  -webkit-transition: 0.3s;
   transition: 0.3s;
 
   &:before,
@@ -305,6 +306,7 @@ body:hover .visually-hidden button {
     width: $navicon-width;
     height: $navicon-height;
     background: #fff;
+    -webkit-transition: 0.3s;
     transition: 0.3s;
   }
 
@@ -318,22 +320,26 @@ body:hover .visually-hidden button {
 }
 
 .close .navicon {
-  // hide the middle line
+  /* hide the middle line*/
   background: transparent;
 
-  // overlay the lines by setting both their top values to 0
+  /* overlay the lines by setting both their top values to 0*/
   &:before, &:after{
-    transform-origin: 50% 50%;
+    -webkit-transform-origin: 50% 50%;
+        -ms-transform-origin: 50% 50%;
+            transform-origin: 50% 50%;
     top: 0;
     width: $navicon-width;
   }
 
-  // rotate the lines to form the x shape
+  /* rotate the lines to form the x shape*/
   &:before{
-    transform: rotate3d(0,0,1,45deg);
+    -webkit-transform: rotate3d(0,0,1,45deg);
+            transform: rotate3d(0,0,1,45deg);
   }
   &:after{
-    transform: rotate3d(0,0,1,-45deg);
+    -webkit-transform: rotate3d(0,0,1,-45deg);
+            transform: rotate3d(0,0,1,-45deg);
   }
 }