/* The MARKUP


    
    

    

    
    
        
        
    

    
    

*/
/* Basic styles */

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
}

body {
  font-family: sans-serif;
  background-color: #F6C390;
}

a {
  text-decoration: none;
}

.container {
  position: relative;
  margin: 35px auto 0;
  width: 300px;
  height: 534px;
  background-color: #533557;
  overflow: hidden;
}

/* To hide the checkbox */
#toggle {
  display: none;
}

/* Styles for the 'open' state, if the checkbox is checked */
#toggle:checked {
/* Any element you need to change the style if menu is open goes here, using the sibling selector (~) as follows*/

 /* Styles for the open navigation menu, for example */
  & ~ .nav {
  }
}

$transition-duration: 0.5s;

/* Showing nav items as lines, making up the hamburger menu icon */
.nav-item {
  position: relative;
  display: inline-block;
  float: left;
  clear: both;
  color: transparent;
  font-size: 14px;
  letter-spacing: -6.2px;
  height: 7px;
  line-height: 7px;
  text-transform: uppercase;
  white-space: nowrap;
  transform: scaleY(0.2);
  transition: $transition-duration, opacity 1s;

  /* Adjusting width for the first line */
  &:nth-child(1) {
    letter-spacing: -8px;
  }

  /* Adjusting width for the second line */
  &:nth-child(2) {
    letter-spacing: -7px;
  }

  /* Adjusting from the fourth element onwards */
  &:nth-child(n + 4) {
    letter-spacing: -8px;
    margin-top: -7px;
    opacity: 0;
  }

  /* Getting the lines for the hamburger menu icon */
  &:before {
    position: absolute;
    content: '';
    top: 50%;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #EC7263;
    transform: translateY(-50%) scaleY(5);
    transition: $transition-duration;
  }
}

$transition-duration: 0.5s;

#toggle:checked {

  /* Open nav */
  & ~ .nav {

    // Restoring nav items from "lines" in the menu icon
    .nav-item {
      color: #EC7263;
      letter-spacing: 0;
      height: 40px;
      line-height: 40px;
      margin-top: 0;
      opacity: 1;
      transform: scaleY(1);
      transition: $transition-duration, opacity 0.1s;

      // Hiding the lines
      &:before {
        opacity: 0;
      }
    }
  }
}

:nth-child

transition-delay

$items: 4;
$transition-delay: 0.05s;

.nav-item {

  /* Setting delays for the nav items in close transition */
  @for $i from 1 through $items {
    &:nth-child(#{$i}) {
      $delay: ($i - 1) * $transition-delay;
      transition-delay: $delay;
      &:before {
        transition-delay: $delay;
      }
    }
  }
}

$delay

$delay: ($items - $i) * $transition-delay;


/* CSS FINAL */
/* Basic styles */
* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
}

body {
  font-family: sans-serif;
  background-color: #F6C390;
}

a {
  text-decoration: none;
}

.container {
  position: relative;
  margin: 35px auto 0;
  width: 300px;
  height: 534px;
  background-color: #533557;
  overflow: hidden;
}

/* Toggle functionality */
#toggle {
  display: none;
}

#toggle:checked ~ .toggle-container .button-toggle {
  box-shadow: 0 0 0 550px rgba(0, 0, 0, 0.1), inset 0 0 0 20px rgba(0, 0, 0, 0.1);
}
#toggle:checked ~ .toggle-container .button-toggle:before {
  transform: translateY(-50%) rotate(45deg) scale(1);
}
#toggle:checked ~ .toggle-container .button-toggle:after {
  transform: translateY(-50%) rotate(-45deg) scale(1);
}
#toggle:checked ~ .nav {
  margin-bottom: 100px;
  pointer-events: auto;
  transform: translate(50px, 50px);
}
#toggle:checked ~ .nav .nav-item {
  color: #EC7263;
  letter-spacing: 0;
  height: 40px;
  line-height: 40px;
  margin-top: 0;
  opacity: 1;
  transform: scaleY(1);
  transition: 0.5s, opacity 0.1s;
}
#toggle:checked ~ .nav .nav-item:nth-child(1) {
  transition-delay: 0.15s;
}
#toggle:checked ~ .nav .nav-item:nth-child(1):before {
  transition-delay: 0.15s;
}
#toggle:checked ~ .nav .nav-item:nth-child(2) {
  transition-delay: 0.1s;
}
#toggle:checked ~ .nav .nav-item:nth-child(2):before {
  transition-delay: 0.1s;
}
#toggle:checked ~ .nav .nav-item:nth-child(3) {
  transition-delay: 0.05s;
}
#toggle:checked ~ .nav .nav-item:nth-child(3):before {
  transition-delay: 0.05s;
}
#toggle:checked ~ .nav .nav-item:nth-child(4) {
  transition-delay: 0s;
}
#toggle:checked ~ .nav .nav-item:nth-child(4):before {
  transition-delay: 0s;
}
#toggle:checked ~ .nav .nav-item:before {
  opacity: 0;
}
#toggle:checked ~ .dummy-content {
  padding-top: 30px;
}
#toggle:checked ~ .dummy-content:before {
  background-color: rgba(0, 0, 0, 0.3);
}

/* Toggle button */
.button-toggle {
  position: absolute;
  display: inline-block;
  width: 20px;
  height: 20px;
  margin: 25px;
  background-color: transparent;
  border: none;
  cursor: pointer;
  border-radius: 100%;
  transition: 0.6s;
}
.button-toggle:hover {
  box-shadow: 0 0 0 8px rgba(0, 0, 0, 0.1), inset 0 0 0 20px rgba(0, 0, 0, 0.1);
}
.button-toggle:before, .button-toggle:after {
  position: absolute;
  content: '';
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #EC7263;
  border-radius: 5px;
  transition: 0.5s;
}
.button-toggle:before {
  transform: translateY(-50%) rotate(45deg) scale(0);
}
.button-toggle:after {
  transform: translateY(-50%) rotate(-45deg) scale(0);
}

/* Menu */
.nav {
  display: inline-block;
  margin: 25px 25px 20px;
  pointer-events: none;
  transition: 0.5s;
}

.nav-item {
  position: relative;
  display: inline-block;
  float: left;
  clear: both;
  color: transparent;
  font-size: 14px;
  letter-spacing: -6.2px;
  height: 7px;
  line-height: 7px;
  text-transform: uppercase;
  white-space: nowrap;
  transform: scaleY(0.2);
  transition: 0.5s, opacity 1s;
}
.nav-item:nth-child(1) {
  transition-delay: 0s;
}
.nav-item:nth-child(1):before {
  transition-delay: 0s;
}
.nav-item:nth-child(2) {
  transition-delay: 0.05s;
}
.nav-item:nth-child(2):before {
  transition-delay: 0.05s;
}
.nav-item:nth-child(3) {
  transition-delay: 0.1s;
}
.nav-item:nth-child(3):before {
  transition-delay: 0.1s;
}
.nav-item:nth-child(4) {
  transition-delay: 0.15s;
}
.nav-item:nth-child(4):before {
  transition-delay: 0.15s;
}
.nav-item:nth-child(1) {
  letter-spacing: -8px;
}
.nav-item:nth-child(2) {
  letter-spacing: -7px;
}
.nav-item:nth-child(n + 4) {
  letter-spacing: -8px;
  margin-top: -7px;
  opacity: 0;
}
.nav-item:before {
  position: absolute;
  content: '';
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #EC7263;
  transform: translateY(-50%) scaleY(5);
  transition: 0.5s;
}

/* Dummy content */
.dummy-content {
  position: relative;
  text-align: center;
  transition: 0.5s;
}
.dummy-content:before {
  position: absolute;
  content: '';
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: transparent;
  z-index: 2;
  transition: 0.5s;
}

.circle {
  display: inline-block;
  width: 75px;
  height: 75px;
  background-color: #EC7263;
  border-radius: 100%;
}

.text {
  margin: 15px 0 30px;
}
.text span {
  display: inline-block;
  height: 10px;
  margin: 0 5px;
  background-color: #C06162;
  border-radius: 5px;
}
.text span:first-child {
  width: 50px;
}
.text span:last-child {
  width: 80px;
}

.square-top {
  display: inline-block;
  position: relative;
  width: 200px;
  height: 300px;
  background-color: #FEBE7E;
  z-index: 1;
}

.square-behind {
  display: inline-block;
  position: relative;
  top: -256px;
  width: 250px;
  height: 210px;
  background-color: #C28683;
}
.square-behind:before, .square-behind:after {
  position: absolute;
  content: '';
  top: 0;
  width: 40%;
  height: 100%;
}
.square-behind:before {
  left: 0;
  background-color: #9D567C;
}
.square-behind:after {
  right: 0;
  background-color: #958C6B;
}