@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;

$tile-color: #eee4da;
$tile-gold-color: #edc22e;

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;

  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(200ms ease);
  @include transition-property(top, left);

  @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;

  @while $exponent <= $limit {
    $power: pow($base, $exponent);
    $percent: (($exponent - 1) / $limit) * 100;

    &.tile-#{$power} {
      background: mix($tile-gold-color, $tile-color, $percent);

      @if $power >= 100 and $power < 1000 {
        font-size: 45px;
      } @else if $power >= 1000 {
        font-size: 35px;
      }
    }

    $exponent: $exponent + 1;
  }
}