update screenshot in README
update screenshot in README

file:b/README.md (new)
--- /dev/null
+++ b/README.md
@@ -1,1 +1,7 @@
+# 2048
+A small clone of [1024](https://play.google.com/store/apps/details?id=com.veewo.a1024), based on [Saming's 2048](saming.fr/p/2048/) (also a clone).
 
+Made just for fun.
+
+[![Screenshot](http://pictures.gabrielecirulli.com/2048-20140305-231246.png)](http://pictures.gabrielecirulli.com/2048-20140305-231246.png)
+

file:a/index.html -> file:b/index.html
--- a/index.html
+++ b/index.html
@@ -9,6 +9,7 @@
 <body>
   <div class="container">
     <h1>2048</h1>
+    <p class="game-intro">Join the numbers and get to the <strong>2048 tile!</strong></p>
 
     <div class="game-container">
       <div class="grid-container">
@@ -42,17 +43,25 @@
         <div class="tile tile-2 tile-position-1-1">
           2
         </div>
-        <div class="tile tile-4 tile-position-2-3">
-          4
-        </div>
-        <div class="tile tile-512 tile-position-3-2">
-          512
-        </div>
-        <div class="tile tile-2048 tile-position-4-4">
-          2048
-        </div>
+         <div class="tile tile-4 tile-position-2-3">
+            4
+          </div>
+          <div class="tile tile-512 tile-position-3-2">
+            512
+          </div>
+          <div class="tile tile-2048 tile-position-4-4">
+            2048
+          </div>
       </div>
     </div>
+
+    <p class="game-explanation">
+      <strong class="important">How to play:</strong> Use your <strong>arrow keys</strong> to move the tiles. When two tiles with the same number touch, they <strong>merge into one!</strong>
+    </p>
+    <hr>
+    <p>
+      Created by <a href="http://gabrielecirulli.com" target="_blank">Gabriele Cirulli.</a> Based on <a href="https://itunes.apple.com/us/app/1024!/id823499224" target="_blank">1024 by Veewo Studio.</a>
+    </p>
   </div>
 </body>
 </html>

--- a/style/helpers.scss
+++ b/style/helpers.scss
@@ -20,3 +20,14 @@
   @return exponent($base, $exponent);
 }
 
+// Transition mixins
+@mixin transition($args...) {
+  -webkit-transition: $args;
+  -moz-transition: $args;
+}
+
+@mixin transition-property($args...) {
+  -webkit-transition-property: $args;
+  -moz-transition-property: $args;
+}
+

--- a/style/main.css
+++ b/style/main.css
@@ -3,8 +3,9 @@
   margin: 0;
   padding: 0;
   background: #faf8ef;
-  color: #776E65;
-  font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif; }
+  color: #776e65;
+  font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif;
+  font-size: 18px; }
 
 body {
   margin: 80px 0; }
@@ -14,14 +15,37 @@
   font-weight: bold;
   margin: 0; }
 
+p {
+  margin-top: 0;
+  margin-bottom: 10px;
+  line-height: 1.65; }
+
+a {
+  color: #776e65;
+  font-weight: bold;
+  text-decoration: underline; }
+
+strong.important {
+  text-transform: uppercase; }
+
+hr {
+  border: none;
+  border-bottom: 1px solid #d8d4d0;
+  margin-top: 20px;
+  margin-bottom: 30px; }
+
 .container {
   width: 500px;
   margin: 0 auto; }
 
 .game-container {
-  margin-top: 50px;
+  margin-top: 40px;
   position: relative;
   padding: 15px;
+  cursor: default;
+  -webkit-touch-callout: none;
+  -webkit-user-select: none;
+  -moz-user-select: none;
   background: #bbada0;
   border-radius: 6px;
   width: 500px;
@@ -63,8 +87,12 @@
   background: #eee4da;
   text-align: center;
   line-height: 116.25px;
-  font-size: 60px;
-  font-weight: bold; }
+  font-size: 55px;
+  font-weight: bold;
+  -webkit-transition: 200ms ease;
+  -moz-transition: 200ms ease;
+  -webkit-transition-property: top, left;
+  -moz-transition-property: top, left; }
   .tile.tile-position-1-1 {
     position: absolute;
     left: 0px;
@@ -130,30 +158,56 @@
     left: 363.75px;
     top: 363.75px; }
   .tile.tile-2 {
-    background: #eee4da; }
+    background: #eee4da;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0); }
   .tile.tile-4 {
-    background: #ede0ca; }
+    background: #ede0c8;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0); }
   .tile.tile-8 {
-    background: #edddba; }
+    color: #f9f6f2;
+    background: #f2b179;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0); }
   .tile.tile-16 {
-    background: #eddaab; }
+    color: #f9f6f2;
+    background: #f59563;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0); }
   .tile.tile-32 {
-    background: #edd79b; }
+    color: #f9f6f2;
+    background: #f67c5f;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.07937), inset 0 0 0 1px rgba(255, 255, 255, 0.04762); }
   .tile.tile-64 {
-    background: #edd48b; }
+    color: #f9f6f2;
+    background: #f65e3b;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.15873), inset 0 0 0 1px rgba(255, 255, 255, 0.09524); }
   .tile.tile-128 {
-    background: #edd17c;
+    color: #f9f6f2;
+    background: #edcf72;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.2381), inset 0 0 0 1px rgba(255, 255, 255, 0.14286);
     font-size: 45px; }
   .tile.tile-256 {
-    background: #edce6c;
+    color: #f9f6f2;
+    background: #edcc61;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.31746), inset 0 0 0 1px rgba(255, 255, 255, 0.19048);
     font-size: 45px; }
   .tile.tile-512 {
-    background: #edcb5c;
+    color: #f9f6f2;
+    background: #edc850;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.39683), inset 0 0 0 1px rgba(255, 255, 255, 0.2381);
     font-size: 45px; }
   .tile.tile-1024 {
-    background: #edc84d;
+    color: #f9f6f2;
+    background: #edc53f;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.47619), inset 0 0 0 1px rgba(255, 255, 255, 0.28571);
     font-size: 35px; }
   .tile.tile-2048 {
-    background: #edc53d;
+    color: #f9f6f2;
+    background: #edc22e;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.55556), inset 0 0 0 1px rgba(255, 255, 255, 0.33333);
     font-size: 35px; }
 
+.game-intro {
+  margin-bottom: 0; }
+
+.game-explanation {
+  margin-top: 50px; }
+

--- a/style/main.scss
+++ b/style/main.scss
@@ -7,16 +7,21 @@
 $tile-size: ($field-width - $grid-spacing * ($grid-row-cells + 1)) / $grid-row-cells;
 $tile-border-radius: 3px;
 
+$text-color: #776E65;
+$bright-text-color: #f9f6f2;
+
 $tile-color: #eee4da;
 $tile-gold-color: #edc22e;
+$tile-gold-glow-color: lighten($tile-gold-color, 15%);
 
 html, body {
   margin: 0;
   padding: 0;
 
   background: #faf8ef;
-  color: #776E65;
+  color: $text-color;
   font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif;
+  font-size: 18px;
 }
 
 body {
@@ -29,15 +34,45 @@
   margin: 0;
 }
 
+p {
+  margin-top: 0;
+  margin-bottom: 10px;
+  line-height: 1.65;
+}
+
+a {
+  color: $text-color;
+  font-weight: bold;
+  text-decoration: underline;
+}
+
+strong {
+  &.important {
+    text-transform: uppercase;
+  }
+}
+
+hr {
+  border: none;
+  border-bottom: 1px solid lighten($text-color, 40%);
+  margin-top: 20px;
+  margin-bottom: 30px;
+}
+
 .container {
   width: $field-width;
   margin: 0 auto;
 }
 
 .game-container {
-  margin-top: 50px;
+  margin-top: 40px;
   position: relative;
   padding: $grid-spacing;
+
+  cursor: default;
+  -webkit-touch-callout: none;
+  -webkit-user-select: none;
+  -moz-user-select: none;
 
   background: #bbada0;
   border-radius: $tile-border-radius * 2;
@@ -94,9 +129,13 @@
   background: $tile-color;
   text-align: center;
   line-height: $tile-size + 10px;
-  font-size: 60px;
+  font-size: 55px;
   font-weight: bold;
 
+  @include transition(200ms ease);
+  @include transition-property(top, left);
+
+  // Build position classes
   @for $x from 1 through $grid-row-cells {
     @for $y from 1 through $grid-row-cells {
       &.tile-position-#{$x}-#{$y} {
@@ -111,13 +150,50 @@
   $exponent: 1;
   $limit: 11;
 
+  // Colors for all 11 states, false = no special color
+  $special-colors: false false, // 2
+                   false false, // 4
+                   #f78e48 true, // 8
+                   #fc5e2e true, // 16
+                   #ff3333 true, // 32
+                   #ff0000 true, // 64
+                   false true, // 128
+                   false true, // 256
+                   false true, // 512
+                   false true, // 1024
+                   false true; // 2048
+
+  // Build tile colors
   @while $exponent <= $limit {
     $power: pow($base, $exponent);
-    $percent: (($exponent - 1) / $limit) * 100;
 
     &.tile-#{$power} {
-      background: mix($tile-gold-color, $tile-color, $percent);
-
+      // Calculate base background color
+      $gold-percent: ($exponent - 1) / ($limit - 1) * 100;
+      $mixed-background: mix($tile-gold-color, $tile-color, $gold-percent);
+
+      $nth-color: nth($special-colors, $exponent);
+
+      $special-background: nth($nth-color, 1);
+      $bright-color: nth($nth-color, 2);
+
+      @if $special-background {
+        $mixed-background: mix($special-background, $mixed-background, 55%);
+      }
+
+      @if $bright-color {
+        color: $bright-text-color;
+      }
+
+      // Set background
+      background: $mixed-background;
+
+      // Add glow
+      $glow-opacity: max($exponent - 4, 0) / ($limit - 4);
+      box-shadow: 0 0 30px 10px rgba($tile-gold-glow-color, $glow-opacity / 1.8),
+                  inset 0 0 0 1px rgba(white, $glow-opacity / 3);
+
+      // Adjust font size for bigger numbers
       @if $power >= 100 and $power < 1000 {
         font-size: 45px;
       } @else if $power >= 1000 {
@@ -129,5 +205,11 @@
   }
 }
 
-
-
+.game-intro {
+  margin-bottom: 0;
+}
+
+.game-explanation {
+  margin-top: 50px;
+}
+

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