remove debug logging
remove debug logging

file:b/.jshintrc (new)
--- /dev/null
+++ b/.jshintrc
@@ -1,1 +1,20 @@
+{
+    "esnext": true,
+    "indent": 2,
+    "maxlen": 80,
+    "freeze": true,
+    "camelcase": true,
+    "unused": true,
+    "eqnull": true,
+    "proto": true,
+    "supernew": true,
+    "noyield": true,
+    "evil": true,
+    "node": true,
+    "boss": true,
+    "expr": true,
+    "loopfunc": true,
+    "white": true,
+    "maxdepth": 4
+}
 

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
@@ -4,11 +4,19 @@
   <meta charset="utf-8">
   <title>2048</title>
 
-  <link href="style/style.css" rel="stylesheet" type="text/css">
+  <link href="style/main.css" rel="stylesheet" type="text/css">
+
+  <script src="js/keyboard_input_manager.js"></script>
+  <script src="js/html_actuator.js"></script>
+  <script src="js/grid.js"></script>
+  <script src="js/tile.js"></script>
+  <script src="js/game_manager.js"></script>
+  <script src="js/application.js"></script>
 </head>
 <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">
@@ -39,14 +47,17 @@
       </div>
 
       <div class="tile-container">
-        <div class="tile tile-2 tile-position-1-1">
-          2
-        </div>
-        <div class="tile tile-4 tile-position-2-3">
-          4
-        </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>

file:b/js/application.js (new)
--- /dev/null
+++ b/js/application.js
@@ -1,1 +1,5 @@
+// Wait till the browser is ready to render the game (avoids glitches)
+window.requestAnimationFrame(function () {
+  var manager = new GameManager(4, KeyboardInputManager, HTMLActuator);
+});
 

--- /dev/null
+++ b/js/game_manager.js
@@ -1,1 +1,133 @@
+function GameManager(size, InputManager, Actuator) {
+  this.size         = size; // Size of the grid
+  this.inputManager = new InputManager;
+  this.actuator     = new Actuator;
 
+  this.startTiles   = 2;
+  this.grid         = new Grid(this.size);
+
+  this.inputManager.on("move", this.move.bind(this));
+
+  this.setup();
+}
+
+// Set up the game
+GameManager.prototype.setup = function () {
+  this.addStartTiles();
+
+  // Update the actuator
+  this.actuate();
+};
+
+// Set up the initial tiles to start the game with
+GameManager.prototype.addStartTiles = function () {
+  for (var i = 0; i < this.startTiles; i++) {
+    this.addRandomTile();
+  }
+};
+
+// Adds a tile in a random position
+GameManager.prototype.addRandomTile = function () {
+  if (this.grid.cellsAvailable()) {
+    var value = Math.random() < 0.9 ? 2 : 4;
+    var tile = new Tile(this.grid.randomAvailableCell(), value);
+
+    this.grid.insertTile(tile);
+  }
+};
+
+// Sends the updated grid to the actuator
+GameManager.prototype.actuate = function () {
+  this.actuator.actuate(this.grid);
+};
+
+// Saves all the current tile positions
+GameManager.prototype.saveTilePositions = function () {
+  this.grid.eachCell(function (x, y, tile) {
+    if (tile) {
+      tile.savePosition();
+    }
+  });
+};
+
+// Move a tile and its representation
+GameManager.prototype.moveTile = function (tile, cell) {
+  this.grid.cells[tile.x][tile.y] = null;
+  this.grid.cells[cell.x][cell.y] = tile;
+  tile.x = cell.x;
+  tile.y = cell.y;
+};
+
+// Move tiles on the grid in the specified direction
+GameManager.prototype.move = function (direction) {
+  // 0: up, 1: right, 2:down, 3: left
+  var self = this;
+
+  var cell, tile;
+
+  var vector     = this.getVector(direction);
+  var traversals = this.buildTraversals(vector);
+
+  // Save the current tile positions (for actuator awareness)
+  this.saveTilePositions();
+
+  // Traverse the grid in the right direction and move tiles
+  traversals.x.forEach(function (x) {
+    traversals.y.forEach(function (y) {
+      cell = { x: x, y: y };
+      tile = self.grid.cellContent(cell);
+
+      if (tile) {
+        var pos = self.findFarthestPosition(cell, vector);
+        self.moveTile(tile, pos);
+      }
+    });
+  });
+
+  this.addRandomTile();
+  this.actuate();
+};
+
+// Get the vector representing the chosen direction
+GameManager.prototype.getVector = function (direction) {
+  // Vectors representing tile movement
+  var map = {
+    0: { x: 0,  y: -1 }, // up
+    1: { x: 1,  y: 0 },  // right
+    2: { x: 0,  y: 1 },  // down
+    3: { x: -1, y: 0 }   // left
+  };
+
+  return map[direction];
+};
+
+// Build a list of positions to traverse in the right order
+GameManager.prototype.buildTraversals = function (vector) {
+  var traversals = { x: [], y: [] };
+
+  for (var pos = 0; pos < this.size; pos++) {
+    traversals.x.push(pos);
+    traversals.y.push(pos);
+  }
+
+  // Always traverse from the farthest cell in the chosen direction
+  if (vector.x === 1) traversals.x = traversals.x.reverse();
+  if (vector.y === 1) traversals.y = traversals.y.reverse();
+
+  return traversals;
+};
+
+GameManager.prototype.findFarthestPosition = function (cell, vector) {
+  var previous;
+
+  // Progress towards the vector direction until an obstacle is found
+  do {
+    previous = cell;
+    cell     = { x: previous.x + vector.x, y: previous.y + vector.y };
+  } while (cell.x >= 0 && cell.x < this.size &&
+           cell.y >= 0 && cell.y < this.size &&
+           this.grid.cellAvailable(cell));
+
+  return previous;
+};
+

file:b/js/grid.js (new)
--- /dev/null
+++ b/js/grid.js
@@ -1,1 +1,72 @@
+function Grid(size) {
+  this.size = size;
 
+  this.cells = [];
+
+  this.build();
+}
+
+// Build a grid of the specified size
+Grid.prototype.build = function () {
+  for (var x = 0; x < this.size; x++) {
+    var row = this.cells[x] = [];
+
+    for (var y = 0; y < this.size; y++) {
+      row.push(null);
+    }
+  }
+};
+
+// Find the first available random position
+Grid.prototype.randomAvailableCell = function () {
+  var cells = this.availableCells();
+
+  if (cells.length) {
+    return cells[Math.floor(Math.random() * cells.length)];
+  }
+};
+
+Grid.prototype.availableCells = function () {
+  var cells = [];
+
+  this.eachCell(function (x, y, tile) {
+    if (!tile) {
+      cells.push({ x: x, y: y });
+    }
+  });
+
+  return cells;
+};
+
+// Call callback for every cell
+Grid.prototype.eachCell = function (callback) {
+  for (var x = 0; x < this.size; x++) {
+    for (var y = 0; y < this.size; y++) {
+      callback(x, y, this.cells[x][y]);
+    }
+  }
+};
+
+// Check if there are any cells available
+Grid.prototype.cellsAvailable = function () {
+  return !!this.availableCells().length;
+};
+
+// Check if the specified cell is taken
+Grid.prototype.cellAvailable = function (cell) {
+  return !this.cellOccupied(cell);
+};
+
+Grid.prototype.cellOccupied = function (cell) {
+  return !!this.cellContent(cell);
+};
+
+Grid.prototype.cellContent = function (cell) {
+  return this.cells[cell.x][cell.y];
+};
+
+// Inserts a tile at its position
+Grid.prototype.insertTile = function (tile) {
+  this.cells[tile.x][tile.y] = tile;
+};
+

--- /dev/null
+++ b/js/html_actuator.js
@@ -1,1 +1,59 @@
+function HTMLActuator() {
+  this.tileContainer = document.getElementsByClassName("tile-container")[0];
+}
 
+HTMLActuator.prototype.actuate = function (grid) {
+  var self = this;
+
+  window.requestAnimationFrame(function () {
+    self.clearContainer();
+
+    grid.cells.forEach(function (column) {
+      column.forEach(function (cell) {
+        if (cell) {
+          self.addTile(cell);
+        }
+      });
+    });
+  });
+};
+
+HTMLActuator.prototype.clearContainer = function () {
+  while (this.tileContainer.firstChild) {
+    this.tileContainer.removeChild(this.tileContainer.firstChild);
+  }
+};
+
+HTMLActuator.prototype.addTile = function (tile) {
+  var self = this;
+
+  var element   = document.createElement("div");
+  var position  = tile.previousPosition || { x: tile.x, y: tile.y };
+  positionClass = this.positionClass(position);
+
+  element.classList.add("tile", "tile-" + tile.value, positionClass);
+  element.textContent = tile.value;
+
+  this.tileContainer.appendChild(element);
+
+
+  if (tile.previousPosition) {
+    window.requestAnimationFrame(function () {
+      element.classList.remove(element.classList[2]);
+      element.classList.add(self.positionClass({ x: tile.x, y: tile.y }));
+    });
+  } else {
+    element.classList.add("tile-new");
+  }
+
+};
+
+HTMLActuator.prototype.normalizePosition = function (position) {
+  return { x: position.x + 1, y: position.y + 1 };
+};
+
+HTMLActuator.prototype.positionClass = function (position) {
+  position = this.normalizePosition(position);
+  return "tile-position-" + position.x + "-" + position.y;
+};
+

--- /dev/null
+++ b/js/keyboard_input_manager.js
@@ -1,1 +1,44 @@
+function KeyboardInputManager() {
+  this.events = {};
 
+  this.listen();
+}
+
+KeyboardInputManager.prototype.on = function (event, callback) {
+  if (!this.events[event]) {
+    this.events[event] = [];
+  }
+  this.events[event].push(callback);
+};
+
+KeyboardInputManager.prototype.emit = function (event, data) {
+  var callbacks = this.events[event];
+  if (callbacks) {
+    callbacks.forEach(function (callback) {
+      callback(data);
+    });
+  }
+};
+
+KeyboardInputManager.prototype.listen = function () {
+  var self = this;
+
+  var map = {
+    38: 0, // Up
+    39: 1, // Right
+    40: 2, // Down
+    37: 3  // Left
+  };
+
+  document.addEventListener("keydown", function (event) {
+    var modifiers = event.altKey && event.ctrlKey && event.metaKey &&
+                    event.shiftKey;
+    var mapped    = map[event.which];
+
+    if (!modifiers && mapped !== undefined) {
+      event.preventDefault();
+      self.emit("move", mapped);
+    }
+  });
+};
+

file:b/js/tile.js (new)
--- /dev/null
+++ b/js/tile.js
@@ -1,1 +1,12 @@
+function Tile(position, value) {
+  this.x                = position.x;
+  this.y                = position.y;
+  this.value            = value || 2;
 
+  this.previousPosition = null;
+}
+
+Tile.prototype.savePosition = function () {
+  this.previousPosition = { x: this.x, y: this.y };
+};
+

--- /dev/null
+++ b/style/helpers.scss
@@ -1,1 +1,56 @@
+// Exponent
+// From: https://github.com/Team-Sass/Sassy-math/blob/master/sass/math.scss#L36
 
+@function exponent($base, $exponent) {
+  // reset value
+  $value: $base;
+  // positive intergers get multiplied
+  @if $exponent > 1 {
+    @for $i from 2 through $exponent {
+      $value: $value * $base; } }
+  // negitive intergers get divided. A number divided by itself is 1
+  @if $exponent < 1 {
+    @for $i from 0 through -$exponent {
+      $value: $value / $base; } }
+  // return the last value written
+  @return $value;
+}
+
+@function pow($base, $exponent) {
+  @return exponent($base, $exponent);
+}
+
+// Transition mixins
+@mixin transition($args...) {
+  -webkit-transition: $args;
+  -moz-transition: $args;
+}
+
+@mixin transition-property($args...) {
+  -webkit-transition-property: $args;
+  -moz-transition-property: $args;
+}
+
+// Keyframe animations
+@mixin keyframes($animation-name) {
+  @-webkit-keyframes $animation-name {
+    @content;
+  }
+  @-moz-keyframes $animation-name {
+    @content;
+  }
+  @keyframes $animation-name {
+    @content;
+  }
+}
+
+@mixin animation($str) {
+  -webkit-animation: #{$str};
+  -moz-animation: #{$str};
+}
+
+@mixin animation-fill-mode($str) {
+  -webkit-animation-fill-mode: #{$str};
+  -moz-animation-fill-mode: #{$str};
+}
+

file:b/style/main.css (new)
--- /dev/null
+++ b/style/main.css
@@ -1,1 +1,246 @@
-
+@import url(fonts/clear-sans.css);
+html, body {
+  margin: 0;
+  padding: 0;
+  background: #faf8ef;
+  color: #776e65;
+  font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif;
+  font-size: 18px; }
+
+body {
+  margin: 80px 0; }
+
+h1 {
+  font-size: 80px;
+  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: 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;
+  height: 500px;
+  box-sizing: border-box; }
+
+.grid-container {
+  position: absolute;
+  z-index: 1; }
+
+.grid-row {
+  margin-bottom: 15px; }
+  .grid-row:last-child {
+    margin-bottom: 0; }
+  .grid-row:after {
+    content: "";
+    display: block;
+    clear: both; }
+
+.grid-cell {
+  width: 106.25px;
+  height: 106.25px;
+  margin-right: 15px;
+  float: left;
+  border-radius: 3px;
+  background: rgba(238, 228, 218, 0.35); }
+  .grid-cell:last-child {
+    margin-right: 0; }
+
+.tile-container {
+  position: absolute;
+  z-index: 2; }
+
+.tile {
+  background: red;
+  width: 106.25px;
+  height: 106.25px;
+  border-radius: 3px;
+  background: #eee4da;
+  text-align: center;
+  line-height: 116.25px;
+  font-size: 55px;
+  font-weight: bold;
+  -webkit-transition: 100ms ease-in-out;
+  -moz-transition: 100ms ease-in-out;
+  -webkit-transition-property: top, left;
+  -moz-transition-property: top, left; }
+  .tile.tile-position-1-1 {
+    position: absolute;
+    left: 0px;
+    top: 0px; }
+  .tile.tile-position-1-2 {
+    position: absolute;
+    left: 0px;
+    top: 121.25px; }
+  .tile.tile-position-1-3 {
+    position: absolute;
+    left: 0px;
+    top: 242.5px; }
+  .tile.tile-position-1-4 {
+    position: absolute;
+    left: 0px;
+    top: 363.75px; }
+  .tile.tile-position-2-1 {
+    position: absolute;
+    left: 121.25px;
+    top: 0px; }
+  .tile.tile-position-2-2 {
+    position: absolute;
+    left: 121.25px;
+    top: 121.25px; }
+  .tile.tile-position-2-3 {
+    position: absolute;
+    left: 121.25px;
+    top: 242.5px; }
+  .tile.tile-position-2-4 {
+    position: absolute;
+    left: 121.25px;
+    top: 363.75px; }
+  .tile.tile-position-3-1 {
+    position: absolute;
+    left: 242.5px;
+    top: 0px; }
+  .tile.tile-position-3-2 {
+    position: absolute;
+    left: 242.5px;
+    top: 121.25px; }
+  .tile.tile-position-3-3 {
+    position: absolute;
+    left: 242.5px;
+    top: 242.5px; }
+  .tile.tile-position-3-4 {
+    position: absolute;
+    left: 242.5px;
+    top: 363.75px; }
+  .tile.tile-position-4-1 {
+    position: absolute;
+    left: 363.75px;
+    top: 0px; }
+  .tile.tile-position-4-2 {
+    position: absolute;
+    left: 363.75px;
+    top: 121.25px; }
+  .tile.tile-position-4-3 {
+    position: absolute;
+    left: 363.75px;
+    top: 242.5px; }
+  .tile.tile-position-4-4 {
+    position: absolute;
+    left: 363.75px;
+    top: 363.75px; }
+  .tile.tile-2 {
+    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: #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 {
+    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 {
+    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 {
+    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 {
+    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 {
+    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 {
+    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 {
+    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 {
+    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 {
+    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; }
+
+@-webkit-keyframes appear {
+  0% {
+    -webkit-transform: scale(1.5);
+    opacity: 0; }
+
+  100% {
+    -webkit-transform: scale(1);
+    opacity: 1; } }
+
+@-moz-keyframes appear {
+  0% {
+    -webkit-transform: scale(1.5);
+    opacity: 0; }
+
+  100% {
+    -webkit-transform: scale(1);
+    opacity: 1; } }
+
+@keyframes appear {
+  0% {
+    -webkit-transform: scale(1.5);
+    opacity: 0; }
+
+  100% {
+    -webkit-transform: scale(1);
+    opacity: 1; } }
+
+.tile-new {
+  -webkit-animation: appear 200ms ease 100ms;
+  -moz-animation: appear 200ms ease 100ms;
+  -webkit-animation-fill-mode: both;
+  -moz-animation-fill-mode: both; }
+
+.game-intro {
+  margin-bottom: 0; }
+
+.game-explanation {
+  margin-top: 50px; }
+

file:b/style/main.scss (new)
--- /dev/null
+++ b/style/main.scss
@@ -1,1 +1,234 @@
-
+@import "helpers";
+@import "fonts/clear-sans.css";
+
+$field-width: 500px;
+$grid-spacing: 15px;
+$grid-row-cells: 4;
+$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%);
+
+$transition-speed: 100ms;
+
+html, body {
+  margin: 0;
+  padding: 0;
+
+  background: #faf8ef;
+  color: $text-color;
+  font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif;
+  font-size: 18px;
+}
+
+body {
+  margin: 80px 0;
+}
+
+h1 {
+  font-size: 80px;
+  font-weight: bold;
+  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: 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;
+  width: $field-width;
+  height: $field-width;
+  box-sizing: border-box;
+}
+
+.grid-container {
+  position: absolute;
+  z-index: 1;
+}
+
+.grid-row {
+  margin-bottom: $grid-spacing;
+
+  &:last-child {
+    margin-bottom: 0;
+  }
+
+  &:after {
+    content: "";
+    display: block;
+    clear: both;
+  }
+}
+
+.grid-cell {
+  width: $tile-size;
+  height: $tile-size;
+  margin-right: $grid-spacing;
+  float: left;
+
+  border-radius: $tile-border-radius;
+
+  background: rgba($tile-color, .35);
+
+  &:last-child {
+    margin-right: 0;
+  }
+}
+
+.tile-container {
+  position: absolute;
+  z-index: 2;
+}
+
+.tile {
+  background: red;
+  width: $tile-size;
+  height: $tile-size;
+  border-radius: $tile-border-radius;
+
+  background: $tile-color;
+  text-align: center;
+  line-height: $tile-size + 10px;
+  font-size: 55px;
+  font-weight: bold;
+
+  @include transition($transition-speed ease-in-out);
+  @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}-#{$y} {
+        position: absolute;
+        left: ($tile-size + $grid-spacing) * ($x - 1);
+        top: ($tile-size + $grid-spacing) * ($y - 1);
+      }
+    }
+  }
+
+  $base: 2;
+  $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, $exponent);
+
+    &.tile-#{$power} {
+      // 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 {
+        font-size: 35px;
+      }
+    }
+
+    $exponent: $exponent + 1;
+  }
+}
+
+@include keyframes(appear) {
+  0% {
+    -webkit-transform: scale(1.5);
+    opacity: 0;
+  }
+
+  100% {
+    -webkit-transform: scale(1);
+    opacity: 1;
+  }
+}
+
+.tile-new {
+  @include animation(appear 200ms ease $transition-speed);
+  @include animation-fill-mode(both);
+}
+
+.game-intro {
+  margin-bottom: 0;
+}
+
+.game-explanation {
+  margin-top: 50px;
+}
+

file:a/style/style.css (deleted)
--- a/style/style.css
+++ /dev/null
@@ -1,132 +1,1 @@
-@import url(fonts/clear-sans.css);
-html, body {
-  margin: 0;
-  padding: 0;
-  background: #faf8ef;
-  color: #776E65;
-  font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif; }
 
-body {
-  margin: 80px 0; }
-
-h1 {
-  font-size: 80px;
-  font-weight: bold;
-  margin: 0; }
-
-.container {
-  width: 500px;
-  margin: 0 auto; }
-
-.game-container {
-  margin-top: 50px;
-  position: relative;
-  padding: 15px;
-  background: #bbada0;
-  border-radius: 6px;
-  width: 500px;
-  height: 500px;
-  box-sizing: border-box; }
-
-.grid-container {
-  position: absolute;
-  z-index: 1; }
-
-.grid-row {
-  margin-bottom: 15px; }
-  .grid-row:last-child {
-    margin-bottom: 0; }
-  .grid-row:after {
-    content: "";
-    display: block;
-    clear: both; }
-
-.grid-cell {
-  width: 106.25px;
-  height: 106.25px;
-  margin-right: 15px;
-  float: left;
-  border-radius: 3px;
-  background: rgba(238, 228, 218, 0.35); }
-  .grid-cell:last-child {
-    margin-right: 0; }
-
-.tile-container {
-  position: absolute;
-  z-index: 2; }
-
-.tile {
-  background: red;
-  width: 106.25px;
-  height: 106.25px;
-  border-radius: 3px;
-  background: #eee4da;
-  text-align: center;
-  line-height: 116.25px;
-  font-size: 60px;
-  font-weight: bold; }
-  .tile.tile-position-1-1 {
-    position: absolute;
-    left: 0px;
-    top: 0px; }
-  .tile.tile-position-1-2 {
-    position: absolute;
-    left: 0px;
-    top: 121.25px; }
-  .tile.tile-position-1-3 {
-    position: absolute;
-    left: 0px;
-    top: 242.5px; }
-  .tile.tile-position-1-4 {
-    position: absolute;
-    left: 0px;
-    top: 363.75px; }
-  .tile.tile-position-2-1 {
-    position: absolute;
-    left: 121.25px;
-    top: 0px; }
-  .tile.tile-position-2-2 {
-    position: absolute;
-    left: 121.25px;
-    top: 121.25px; }
-  .tile.tile-position-2-3 {
-    position: absolute;
-    left: 121.25px;
-    top: 242.5px; }
-  .tile.tile-position-2-4 {
-    position: absolute;
-    left: 121.25px;
-    top: 363.75px; }
-  .tile.tile-position-3-1 {
-    position: absolute;
-    left: 242.5px;
-    top: 0px; }
-  .tile.tile-position-3-2 {
-    position: absolute;
-    left: 242.5px;
-    top: 121.25px; }
-  .tile.tile-position-3-3 {
-    position: absolute;
-    left: 242.5px;
-    top: 242.5px; }
-  .tile.tile-position-3-4 {
-    position: absolute;
-    left: 242.5px;
-    top: 363.75px; }
-  .tile.tile-position-4-1 {
-    position: absolute;
-    left: 363.75px;
-    top: 0px; }
-  .tile.tile-position-4-2 {
-    position: absolute;
-    left: 363.75px;
-    top: 121.25px; }
-  .tile.tile-position-4-3 {
-    position: absolute;
-    left: 363.75px;
-    top: 242.5px; }
-  .tile.tile-position-4-4 {
-    position: absolute;
-    left: 363.75px;
-    top: 363.75px; }
-

file:a/style/style.scss (deleted)
--- a/style/style.scss
+++ /dev/null
@@ -1,110 +1,1 @@
-@import "fonts/clear-sans.css";
 
-$field-width: 500px;
-$grid-spacing: 15px;
-$grid-row-cells: 4;
-$tile-size: ($field-width - $grid-spacing * ($grid-row-cells + 1)) / $grid-row-cells;
-$tile-border-radius: 3px;
-
-$tile-color: #eee4da;
-
-html, body {
-  margin: 0;
-  padding: 0;
-
-  background: #faf8ef;
-  color: #776E65;
-  font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif;
-}
-
-body {
-  margin: 80px 0;
-}
-
-h1 {
-  font-size: 80px;
-  font-weight: bold;
-  margin: 0;
-}
-
-.container {
-  width: $field-width;
-  margin: 0 auto;
-}
-
-.game-container {
-  margin-top: 50px;
-  position: relative;
-  padding: $grid-spacing;
-
-  background: #bbada0;
-  border-radius: $tile-border-radius * 2;
-  width: $field-width;
-  height: $field-width;
-  box-sizing: border-box;
-}
-
-.grid-container {
-  position: absolute;
-  z-index: 1;
-}
-
-.grid-row {
-  margin-bottom: $grid-spacing;
-
-  &:last-child {
-    margin-bottom: 0;
-  }
-
-  &:after {
-    content: "";
-    display: block;
-    clear: both;
-  }
-}
-
-.grid-cell {
-  width: $tile-size;
-  height: $tile-size;
-  margin-right: $grid-spacing;
-  float: left;
-
-  border-radius: $tile-border-radius;
-
-  background: rgba($tile-color, .35);
-
-  &:last-child {
-    margin-right: 0;
-  }
-}
-
-.tile-container {
-  position: absolute;
-  z-index: 2;
-}
-
-.tile {
-  background: red;
-  width: $tile-size;
-  height: $tile-size;
-  border-radius: $tile-border-radius;
-
-  background: $tile-color;
-  text-align: center;
-  line-height: $tile-size + 10px;
-  font-size: 60px;
-  font-weight: bold;
-
-  @for $x from 1 through $grid-row-cells {
-    @for $y from 1 through $grid-row-cells {
-      &.tile-position-#{$x}-#{$y} {
-        position: absolute;
-        left: ($tile-size + $grid-spacing) * ($x - 1);
-        top: ($tile-size + $grid-spacing) * ($y - 1);
-      }
-    }
-  }
-}
-
-
-

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