input {
  position: fixed;
  opacity: 0;
}

label {
  position: absolute;
  margin: 0;
  padding: 0;
  border: none;
  outline: none;
  background: none;
  cursor: pointer;
}

label::before {
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(10, 38, 57, 0.75);
  content: "";
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

label .burger {
  position: fixed;
  top: 1em;
  left: 1em;
  z-index: 999;
  width: 2em;
  height: 2em;
  margin: 0;
  padding: 0;
  transition: opacity 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

label .burger::before,
label .burger .bar,
label .burger::after {
  position: absolute;
  left: 0;
  display: block;
  width: 100%;
  height: 12%;
  background: #ccc;
  content: "";
  transition: all 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

label .burger .bar {
  top: 44%;
}

label .burger::before {
  top: 0;
  transform-origin: top left;
}

label .burger::after {
  bottom: 0;
  transform-origin: bottom left;
}

input:focus+label .burger,
label:hover .burger {
  opacity: 0.75;
}

label:hover .burger::before {
  background: #EF7F7A;
}

label:hover .burger .bar {
  background: #EF7F7A;
}

label:hover .burger::after {
  background: #EF7F7A;
}

nav {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 2;
  display: flex;
  flex-flow: column nowrap;
  justify-content: center;
  align-items: flex-start;
  transform: translate3d(0, 0, 0);
  /* material acceleration */
  transform: translateX(-100%);
  will-change: transform;
  transition: transform 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

nav::before {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: -1;
  width: 25em;
  content: "";
  transform: skewX(15deg) translateX(-100%);
  transform-origin: bottom left;
  will-change: transform;
  transition: transform 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

.item1 {
  transform: translateY(-15%) translateX(-40%) !important;
}

.item2 {
  transform: translateY(-10%) translateX(-40%) !important;
}

.item3 {
  transform: translateY(-5%) translateX(-40%) !important;
}

.item4 {
  transform: translateY(-0%) translateX(-40%) !important;
}

.bg {
  position: fixed;
  width: auto;
  height: 120%;
  top: 0;
  left: 0;
  bottom: 0;
  transform: translateY(0%) translateX(-90%);
  will-change: transform;
  transition: transform 0.5s;
}

/* @media (min-width: 40em) {
  nav::before {
    width: 40em;
  }
} */

nav a {
  margin: 0.5em 0;
  padding: 0.2em 2em;
  font-size: 1.5em;
  color: white;
  text-decoration: none;
  font-weight: 500;
  transform: translateX(-100%);
  transition: color 0.15s, transform 0.5s;
  transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1);
}

nav a:nth-child(1) {
  transition-delay: 0s, 100ms;
}

nav a:nth-child(2) {
  transition-delay: 0s, 150ms;
}

nav a:nth-child(3) {
  transition-delay: 0s, 200ms;
}

nav a:nth-child(4) {
  transition-delay: 0s, 250ms;
}

nav a:nth-child(5) {
  transition-delay: 0s, 300ms;
}

nav a:nth-child(6) {
  transition-delay: 0s, 350ms;
}

nav a:hover,
nav a:focus {
  color: #EF7F7A;
}

nav a svg:hover,
nav a svg:focus {
  fill: #EF7F7A;
}


nav a:before {
  content: "";
  width: 0;
  height: 2px;
  position: absolute;
  bottom: 0;
  left: 0;
  background-color: #1d3f72;
  -webkit-transition: all .7s ease-in-out;
  -moz-transition: all .7s ease-in-out;
  -ms-transition: all .7s ease-in-out;
  -o-transition: all .7s ease-in-out;
  transition: all .7s ease-in-out;
}

nav a:hover:before {
  width: 100%;
}


main {
  overflow: hidden;
}

main .content {
  transform: translate3d(0, 0, 0);
  /* material acceleration */
  will-change: transform, filter;
  transition: all 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

[id=navcheck]:checked+label::before {
  opacity: 1;
  pointer-events: auto;
}

[id=navcheck]:checked+label .burger::before,
[id=navcheck]:checked+label .burger::after {
  width: 141.42%;
}

[id=navcheck]:checked+label .burger::before {
  transform: rotate(45deg) translateY(-50%);
}

[id=navcheck]:checked+label .burger::after {
  transform: rotate(-45deg) translateY(50%);
}

[id=navcheck]:checked+label .burger .bar {
  transform: scale(0.1);
}

[id=navcheck]:checked~nav {
  transform: translateX(0);
}

[id=navcheck]:checked~nav .bg {
  transform: translateY(0%) translateX(-20%);
}

[id=navcheck]:checked~nav::before {
  transform: skewX(0deg) translateX(0);
}

[id=navcheck]:checked~nav a {
  transform: translateX(0);
}

[id=navcheck]:checked~main .content {
  transform: translateX(3em);
  transform-origin: left center;
  filter: blur(2px);
}

/* helper */
.visuallyhidden {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}