mix colors with optional predefined colors for each tile
mix colors with optional predefined colors for each tile

file:a/index.html -> file:b/index.html
--- a/index.html
+++ b/index.html
@@ -42,13 +42,34 @@
         <div class="tile tile-2 tile-position-1-1">
           2
         </div>
-        <div class="tile tile-4 tile-position-2-3">
+        <div class="tile tile-4 tile-position-2-1">
           4
         </div>
-        <div class="tile tile-512 tile-position-3-2">
+        <div class="tile tile-8 tile-position-3-1">
+          8
+        </div>
+        <div class="tile tile-16 tile-position-4-1">
+          16
+        </div>
+        <div class="tile tile-32 tile-position-1-2">
+          32
+        </div>
+        <div class="tile tile-64 tile-position-2-2">
+          64
+        </div>
+        <div class="tile tile-128 tile-position-3-2">
+          128
+        </div>
+        <div class="tile tile-256 tile-position-4-2">
+          256
+        </div>
+        <div class="tile tile-512 tile-position-1-3">
           512
         </div>
-        <div class="tile tile-2048 tile-position-4-4">
+        <div class="tile tile-1024 tile-position-2-3">
+          1024
+        </div>
+        <div class="tile tile-2048 tile-position-3-3">
           2048
         </div>
       </div>

--- a/style/main.css
+++ b/style/main.css
@@ -3,7 +3,7 @@
   margin: 0;
   padding: 0;
   background: #faf8ef;
-  color: #776E65;
+  color: #776e65;
   font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif; }
 
 body {
@@ -138,30 +138,50 @@
     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; }
 

--- a/style/main.scss
+++ b/style/main.scss
@@ -7,15 +7,19 @@
 $tile-size: ($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;
 }
 
@@ -105,6 +109,7 @@
   @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} {
@@ -119,13 +124,50 @@
   $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 {

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