@import 'compass';
@import "compass/reset";
@import "compass/css3";
/// Remove the unit of a length
/// @param {Number} $number - Number to remove unit from
/// @return {Number} - Unitless number
@function strip-unit($number) {
  @if type-of($number) == 'number' and not unitless($number) {
    @return $number / ($number * 0 + 1);
  }

  @return $number;
}

* {
  position: relative;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: "Helvetica Neue", Helvetica, "Hiragino Sans GB", "STHeitiSC-Light", "Microsoft YaHei", Arial, sans-serif;
}


html,
body {
  height: 100%;
}
body {
  background: #52be7f;
  color: #fff;
}
$background: #52be7f;
$percent: 0.32;
$items : 4;// item number;
$total-angle: 360deg; //sum angle of all items, < 360 semi-circle, = 360 complete-circle
$space: 3deg; // space between items
$diameter: 400px;//complete circle radius
$space-number: if($total-angle == 360deg, $items, $items - 1);
$central-angle: ($total-angle - ($space * $space-number )) / $items;// - ($space * ($items - 1) ) //central angle of each item, it must < 90 deg
$rotate-unit: $central-angle + $space;
$skew: 90deg - $central-angle;

$unskew: - (90deg - $central-angle / 2);
$top: - ( ($total-angle - 180deg) / 2); // - ( ($total-angle + ($items - 1) * $space - 180deg) / 2);
$left: $top - 90deg;
$right: $top + 90deg;
$bottom: $top + 180deg;
$start: $top;
$text-top: $diameter / 2 * $percent / 2 + 5px;
$time: 0.3s;
.cn-wrapper {
  position: absolute;
  top: 100%;
  left: 50%;
  z-index: 10;
  margin-top: - $diameter / 2;
  margin-left: - $diameter / 2;
  width: $diameter;
  height: $diameter;
  border-radius: 50%;
  background: $background;//transparent
  opacity: 0;
  transition: all .3s ease 0.3s;
  transform: scale(0.1);
  pointer-events: none;
  overflow: hidden;
}

/*cover to prevent extra space of anchors from being clickable*/
.cn-wrapper:after{
  $radius: $diameter / 2 + 4px;
  $x: ($radius * strip-unit($radius)) * 2;
  $cover-radius:  sqrt($x) * $percent * 2;
  content:".";
  display:block;
  width: $cover-radius;
  height: $cover-radius;

  position: absolute;
  left: 50%;
  margin-left: (- $cover-radius / 2);
  top:50%;
  margin-top: (- $cover-radius / 2);
  border-radius: 50%;
  z-index:10;
  color: transparent;
  box-sizing: border-box;
  border: 3px solid $background;
}

.opened-nav {
  border-radius: 50%;
  opacity: 1;
  transition: all .3s ease;
  transform: scale(1);
  pointer-events: auto;
}

.cn-wrapper li {
  position: absolute;
  overflow: hidden;
  width: $diameter / 2;
  height: $diameter / 2;
  transition: all .3s ease;
  transform: rotate(76deg) skew($skew);
  border: 1px solid transparent;
  transform-origin: 100% 100%;
  pointer-events: none;
}

.cn-wrapper li a {
  position: absolute;
  right: - $diameter / 2;
  bottom: - $diameter / 2;
  display: block;
  width: $diameter;
  height: $diameter;
  border-radius: 50%;
  background: #429a67;
  background: radial-gradient(transparent $percent * 100%, #515151 $percent * 100%);
  color: #fff;
  text-align: center;
  text-decoration: none;
  line-height: 2;
  transform: skew(-$skew) rotate($unskew) scale(1);
  backface-visibility: hidden;
  pointer-events: auto;
}

.cn-wrapper li a span {
  position: relative;
  top: $text-top;
  display: block;
  font-size: 13px;
  text-transform: uppercase;
}

.cn-wrapper li a:hover,
.cn-wrapper li a:active,
.cn-wrapper li a:focus {
  background: radial-gradient(transparent $percent * 100%, #449e6a $percent * 100%);
}
.cn-wrapper li a:focus {
  position: fixed; /* fix the displacement bug in webkit browsers when using tab key */
}

.opened-nav li {
  transition: all .3s ease .3s;
}

.opened-nav li:first-child {
  transform: rotate($start) skew($skew);
}

.opened-nav li:nth-child(2) {
  transform: rotate($start + $rotate-unit * 1) skew($skew);
}

.opened-nav  li:nth-child(3) {
  transform: rotate($start + $rotate-unit * 2) skew($skew);
}

.opened-nav li:nth-child(4) {
  transform: rotate($start + $rotate-unit * 3) skew($skew);
}

.opened-nav li:nth-child(5) {
  transform: rotate($start + $rotate-unit * 4) skew($skew);
}

.opened-nav li:nth-child(6) {
  transform: rotate($start + $rotate-unit * 5) skew($skew);
}

.opened-nav li:nth-child(7) {
  transform: rotate($start + $rotate-unit * 6) skew($skew);
}

.opened-nav li:nth-child(8) {
  transform: rotate($start + $rotate-unit * 7) skew($skew);
}


.no-csstransforms .cn-wrapper {
  overflow: hidden;
  margin: 10em auto;
  padding: .5em;
  text-align: center;
}

.no-csstransforms .cn-wrapper ul {
  display: inline-block;
}

.no-csstransforms .cn-wrapper li {
  float: left;
  width: 5em;
  height: 5em;
  background-color: #fff;
  text-align: center;
  font-size: 1em;
  line-height: 5em;
}

.no-csstransforms .cn-wrapper li a {
  display: block;
  width: 100%;
  height: 100%;
  color: inherit;
  text-decoration: none;
}

.no-csstransforms .cn-wrapper li a:hover,
.no-csstransforms .cn-wrapper li a:active,
.no-csstransforms .cn-wrapper li a:focus {
  background-color: #f8f8f8;
}

.no-csstransforms .cn-wrapper li.active a{
  background-color: #6F325C;
  color: #fff;
}

.no-csstransforms .cn-button {
  display: none;
}

@media only screen and (max-width: 620px) {
  .no-csstransforms li {
    width: 4em;
    height: 4em;
    line-height: 4em;
  }
}

@media only screen and (max-width: 500px) {
  .no-ccstransforms .cn-wrapper {
    padding: .5em;
  }

  .no-csstransforms .cn-wrapper li {
    width: 4em;
    height: 4em;
    font-size: .9em;
    line-height: 4em;
  }
}

@media only screen and (max-width: 480px) {
  .cn-wrapper {
    font-size: .68em;
  }

  .cn-button {
    font-size: 1em;
  }
}

@media only screen and (max-width:420px) {
  .no-csstransforms .cn-wrapper li {
    width: 100%;
    height: 3em;
    line-height: 3em;
  }
}