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              <div class="calculator">
  <div class="input-prepend">
    <span class="prepend" id="currentOperator"></span>
    <input class="value" disabled="disabled" id="value" value="0" type="number" ng-model="calcScreen" />
  </div>
  <div class="keypad">
    <span data-num="1" class="btn">1</span>
    <span data-num="2" class="btn">2</span>
    <span data-num="3" class="btn">3</span>
    <span data-operator="&plus;" class="btn btn-function">&plus;</span>
    
    <span data-num="4" class="btn">4</span>
    <span data-num="5" class="btn">5</span>
    <span data-num="6" class="btn">6</span>
    <span data-operator="&minus;" class="btn btn-function">&minus;</span>
    
    <span data-num="7" class="btn">7</span>
    <span data-num="8" class="btn">8</span>
    <span data-num="9" class="btn">9</span>
    <span data-operator="&times;" class="btn btn-function">&times;</span>
    
    <span id="clear" class="btn btn-function">c</span>
    <span data-num="0" class="btn">0</span>
    <span id="neg" class="btn btn-function">-</span>
    <span data-operator="&divide;" class="btn btn-function">&divide;</span>
    
    <span data-equals="=" class="btn btn-block">=</span>
  </div>
</div>

<div class="debug">
  <div>Key: <span id="key"></span></div>
  <div>Current: <span id="current"></span></div>
  <div>Previous: <span id="previous"></span></div>
  <div>Operator: <span id="operator"></span></div>
  <div>newInput: <span id="newInput"></span></div>
</div>
            
          
!
            
              @import "compass/css3";

@import "compass";
@import "compass/css3/user-interface"; // For the user-select mixin

// Variables
// ------------------

// Global
$baseFontSize:      20px;
$baseLineHeight:    $baseFontSize;
$blue:              rgba(4,131,163,1);
$bkgd-color:        #827d86;

// Calculator
$calc-height:        370px;
$calc-width:         256px;
$calc-color:         #cdc6c0;
$calc-padding:       20px;
$calc-borderRadius:  20px;

// Value
$value-size:         40px;
$value-color:        $calc-color + 50;

// Buttons
$btn-size:           45px;
$btn-font-size:      20px;
$btn-color:          $calc-color;
$btn-block-color:    #f5b330;
$btn-text-color:     $bkgd-color - 50;

// Mixins
// ------------------

@mixin depth-effect($inner-shadows: $btn-color, $outer-shadows: $calc-color) {
  @include box-shadow (
    // Drop shadow
    0 0 2px rgba(darken($outer-shadows, 100%), 1),  
    
    //Top light
    0 10px 5px -5px rgba($inner-shadows + 50, 1) inset,   

    //Bottom shadow
    0 -10px 5px -8px rgba($inner-shadows - 80, 1) inset,
    
    // All the way around for depth 
    0 0 2px 0 rgba($inner-shadows - 200, .5) inset        
  ); 
  &:active {
    @include box-shadow (
      // Drop shadow
      0 0 2px rgba(darken($outer-shadows, 100%), 1),  
      
      //Top light
      0 5px 5px -5px rgba($inner-shadows + 50, 1) inset,   
  
      //Bottom shadow
      0 -5px 5px -8px rgba($inner-shadows - 80, 1) inset,    
      
      // All the way around for depth 
      0 0 6px -1px rgba($inner-shadows - 200, .5) inset        
    ); 
  }
}

@mixin bkgd-grad($grad-color: $calc-color) {
  background-color: $grad-color;
  @include filter-gradient($grad-color + 30, $grad-color - 30, vertical);
  @include background-image(linear-gradient(top, $grad-color + 30, $grad-color - 30));
}

// Styles
// ------------------

html {
  height: 100%;
}

body {
  height: 100%;
  width: 100%;
  background-color: $bkgd-color; 
  @include filter-gradient(#0483a3, #002733, horizontal); 
  $experimental-support-for-svg: true;
  @include background-image(radial-gradient(top, circle cover,  $bkgd-color 0%, darken($bkgd-color, 15%) 39%, darken($bkgd-color, 23%) 100%));
  position: relative;
  font-size: $baseFontSize;
  line-height: $baseLineHeight;
  background-attachment: fixed;
}

a {
  text-decoration: underline;
}

$calc-grad-top:     $calc-color + 30;
$calc-grad-bottom:  $calc-color - 30;

.calculator {
  @include box-sizing(border-box);
  @include border-radius($calc-borderRadius);
  @include bkgd-grad;
  @include user-select(none);
  @include rotate3d(76%);
  overflow: hidden;
  width: $calc-width;
  height: $calc-height;
  padding: 20px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-top: -$calc-height / 2;
  margin-left: -$calc-width / 2;

  
  @include box-shadow (
    // Drop shadow
    0 10px 40px rgba($bkgd-color - 100, .8),  
    
    //Top light
    0 10px 5px -5px rgba($calc-color + 70, 1) inset,   

    //Bottom shadow
    0 -10px 5px -8px rgba($calc-color - 70, 1) inset,  
    
    // All the way around for depth 
    0 0 8px -1px rgba($calc-color - 200, 1) inset        
  ); 
  



}

.input-prepend { 
  position: relative; 
  .prepend {
    position: absolute;
    top: 10px;
    left: 10px;
    color: $calc-color - 40
  }
}

.value,
.value[disabled=disabled] {
  @include box-sizing(border-box);
  @include bkgd-grad($value-color);
  @include box-shadow(
    0 0 8px 0 rgba($calc-color - 80, .4) inset  
  );
  width: 100%;
  margin-bottom: 20px;
  height: $value-size;
  padding: 5px 10px;
  text-align: right;
  border: 1px solid $calc-color - 30;
  color: $btn-text-color;
}

.btn {
  @include border-radius(10px);
  @include depth-effect();
  @include box-sizing(border-box);
  @include single-transition(color);
  @include bkgd-grad($btn-color);
  @include text-shadow(1px 1px 0 rgba($btn-color + 20, 1));
  
  border: 1px solid darken($btn-color, 40%);
  color: $btn-text-color;
  cursor: pointer;
  display: inline-block;
  float: left;
  font-size: $btn-font-size;
  font-weight: bold;
  height: $btn-size;
  line-height: $btn-size;
  margin: 0 6px 12px;
  padding: 0;
  text-align: center;
  width: $btn-size;
  
  
  // Last Column of buttons
  &:nth-child(4n) {
    margin-right: 0;
  }
  
  // First Column of Buttons
  &:nth-child(4n - 3) {
    margin-left: 0;
  }
  
  &:hover {
    @include bkgd-grad($btn-color + 10);
  }
  
}

.btn-function {
  @include bkgd-grad($btn-color - 25);
  @include depth-effect($btn-color - 20);
  line-height: $btn-size - 4;
  &:hover {
    @include bkgd-grad($btn-color - 15);
  }
}

.btn-block {
  @extend .btn;
  width: 100%;
  margin: 0;
  
  color: #fff;
  @include text-shadow(1px 1px 0 rgba($btn-block-color - 50, 1));
  
  background: $btn-block-color;
  @include depth-effect($btn-block-color);
  @include bkgd-grad($btn-block-color);
  &:hover { @include bkgd-grad($btn-block-color + 5); }
}

// Other stuff
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.debug {
  display: none;
  position: absolute;
  top: 10px;
  left: 10px;
  .red {color: red;}
}
            
          
!
            
              #Storing elements  
number = operator = prevVal = curVal = keyVal = null
screen         = $('#value')
showOperator   = $('#currentOperator')
newInput       = true
  
$ ->  
  calculate = () ->
    saveCurVal = curVal
    switch operator
      when "+" then curVal = parseInt(prevVal, 10) + parseInt(curVal, 10)
      when "−" then curVal = parseInt(prevVal, 10) - parseInt(curVal, 10)
      when "×" then curVal = parseInt(prevVal, 10) * parseInt(curVal, 10)
      when "÷" then curVal = parseInt(prevVal, 10) / parseInt(curVal, 10)
    
    prevVal = saveCurVal
    screen.val(curVal)
    keyVal = null
  
  debug = () ->
    $('#key').text(keyVal)
    $('#current').text(curVal)
    $('#previous').text(prevVal)
    $('#operator').text(operator)
    $('#newInput').text(newInput)
    
          
  pushNumber =  $('[data-num]').click ->         
    keyVal = $(this).data('num')

    if newInput
      if curVal 
        prevVal = screen.val()
      screen.val(keyVal)
      newInput = false
    else
      screen.val(screen.val() + keyVal)
    curVal = screen.val()      
    debug()
      
  pushOperator = $('[data-operator]').click ->
    if prevVal and !newInput
      calculate() 
    newInput = true
    
    operator = $(this).data('operator')
    showOperator.text(operator)
    debug()
      
  pushEquals = $('[data-equals]').click ->
    calculate()
    showOperator.empty()
    newInput = true
    
  pushClear = $('#clear').click ->
    prevVal = curVal = operator = null
    newInput = true
    showOperator.empty()
    screen.val(0)
          
  pushNegative = $('#neg').click ->
    curVal = 0 - parseInt(curVal, 10)
    screen.val(curVal)
            
          
!
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