/* ==========================================================================
   Grid mixins
   ========================================================================== */

/* 
   Define number of columns in the grid
   Common values would be 12, 16 or 24
   ========================================================================== */

$width: 100%;
$def_grid: 12;
$margin: 0;

@mixin container(){
  margin:0 auto;
  width:$width;
}

/* 
   Works out the width of elements based on total number of columns and width
   number of columns being displayed. Removes 20px for margins.
   ========================================================================== */

@mixin grid($grid:$def_grid,$cols:'',$float:left,$display:inline){
  display:$display;
  float:$float;
  width:(100%/$grid * $cols) - ($margin * 2);
}  

/* 
   Add x amount of column padding before an element
   Example: @include prefix(1,12);
   ========================================================================== */

@mixin prefix($grid:$def_grid,$cols:''){
  margin-left:(100%/$grid * $cols);
}

/* 
   Add x amount of column padding after an element
   Example: @include suffix(2,12);
   ========================================================================== */

@mixin suffix($grid:$def_grid,$cols:''){  
  margin-right:(100%/$grid * $cols);    
}

/* 
   Remove left margin
   Example: @include first;
   ========================================================================== */

@mixin first(){
  margin-left:0;
}

/* 
   Remove right margin
   Example: @include last;
   ========================================================================== */

@mixin last(){
  margin-right:0;
}

/* 
   Push an element x amount of column(s) to the right
   Example: @include push(2,12);
   ========================================================================== */

@mixin push($grid:$def_grid,$move:'') {
  position:relative;
  left:(100%/$grid * $move);
} 

/* 
   Pull an element x amount of column(s) to the left
   Example: @include pull(1,12);
   ========================================================================== */

@mixin pull($grid:$def_grid,$move:''){
  position:relative;
  left:(100%/$grid * $move) * -1;
}