nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
}
nav .menu {
  position: relative;
  margin-left: auto;
}
nav .menu li:hover {
  background-color: rgba(0, 0, 0, 0.05);
}
nav .menu-button {
  position: absolute;
  top: 0;
  right: 0;
  width: 44px;
  height: 44px;
  cursor: pointer;
  z-index: 4;
  overflow: hidden;
}
nav .menu-button .menu-button-line {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 2px;
  background-color: #aad5eb;
  transform: translate(-50%, -50%);
  transition: all .3s 0s cubic-bezier(0.000, 0.995, 0.990, 1.000);
}
nav .menu.open .menu-button .menu-button-line {
  background-color: var(--primary-color);
  border-radius: 1px;
}
nav .menu-button .line-1 {
  top: 35%;
}
nav .menu.open .menu-button .line-1 {
  top: -50%;
}
nav .menu.open .menu-button .line-2 {
  transform: translate(-50%, -50%) rotate(45deg);
}
nav .menu.open .menu-button .line-3 {
  transform: translate(-50%, -50%) rotate(-45deg);
}

nav .menu-button .line-4 {
  top: 65%;
}
nav .menu.open .menu-button .line-4 {
  top: 150%;
}

nav .menu .menu-back {
  position: absolute;
  width: 100vw;
  height: 460px;
  top: 0;
  right: 0;
  overflow: hidden;
  display: none;
}
nav .menu.show .menu-back {
  display: block;
}

nav .menu.open .menu-back {
  box-shadow: 0px 4px 9px 0px #0000001F;
  display: block;
}
@media (min-width: 480px) {
  nav .menu .menu-back {
    width: 280px;
    top: 4px;
    right: 4px;
  }
}
nav .menu .menu-back .menu-circle {
  position: absolute;
  top: 22px;
  right: 22px;
  width: 0;
  height: 0;
  border-radius: 0;
  background-color: rgba(255, 255, 255, 0.9);
  transform-origin: top right;
  transition: all .3s 0s cubic-bezier(0.000, 0.995, 0.990, 1.000);
}
nav .menu.open .menu-back .menu-circle {
  width: 1200px;
  height: 1200px;
  border-radius: 600px;
  transform: translate(578px, -578px);
}

@media (min-width: 480px) {
  nav .menu .menu-back .menu-circle {
    top: 18px;
    right: 18px;
  }
}

nav .menu ul {
  position: absolute;
  top: 0;
  right: 0;
  width: 100vw;
  margin: 0;
  padding: 36px 0 24px 0;
  list-style: none;
  text-align: center;
  font-weight: bold;
  display: block;
  opacity: 0;
  z-index: 2;
  display: none;
}
nav .menu.show ul {
  display: block;
  transition: all .1s 0s ease;
}


@media (min-width: 480px) {
  nav .menu ul {
    top: 4px;
    right: 4px;
    width: 280px;
  }
}

nav .menu.open ul {
  display: block;
}
nav .menu ul.show-list {
  opacity: 1;
}

nav .menu ul li {
  height: 40px;
  line-height: 40px;
}
nav .menu ul a {
  color: var(--primary-color);
  display: block;
  width: 100%;
}
nav .menu ul a:visted {
  color: inherit;
}