* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #e0e5ec;
  --shadow-light: #ffffff;
  --shadow-dark: #a3b1c6;
  --accent: #6c63ff;
  --accent-dark: #574fd6;
  --text: #8a94a6;
  --text-active: #6c63ff;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: var(--bg);
}

.navigation {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  transform: translateY(30px);
}

.toggle {
  position: relative;
  width: 72px;
  height: 72px;
  background: var(--bg);
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  transform: translateY(-30px);
  z-index: 10;
  border: none;
  box-shadow:
    6px 6px 14px var(--shadow-dark),
    -6px -6px 14px var(--shadow-light),
    inset 0px 0px 0px var(--shadow-dark),
    inset 0px 0px 0px var(--shadow-light);
  transition:
    box-shadow 0.3s ease,
    transform 0.3s;
}

.toggle::before {
  content: "+";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: "Nunito", sans-serif;
  font-size: 2.4em;
  font-weight: 300;
  color: var(--accent);
  transition:
    transform 1.2s cubic-bezier(0.4, 0, 0.2, 1),
    color 0.3s;
  line-height: 1;
}

.toggle.active {
  box-shadow:
    0px 0px 0px var(--shadow-dark),
    0px 0px 0px var(--shadow-light),
    inset 4px 4px 10px var(--shadow-dark),
    inset -4px -4px 10px var(--shadow-light);
}

.toggle.active::before {
  transform: translate(-50%, -50%) rotate(225deg);
  color: var(--accent-dark);
}

.menu {
  width: 64px;
  height: 64px;
  background: var(--bg);
  position: absolute;
  border-radius: 80px;
  transform: translateY(-30px);
  transition:
    transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
    width 0.5s cubic-bezier(0.4, 0, 0.2, 1),
    height 0.5s cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow 0.5s;
  transition-delay: 1s, 0.5s, 0.5s, 0.5s;
  box-shadow: none;
}

.toggle.active ~ .menu {
  width: 340px;
  height: 68px;
  transform: translateY(0px);
  transition-delay: 0s, 0.5s, 0.5s, 0.5s;
  box-shadow:
    6px 6px 16px var(--shadow-dark),
    -6px -6px 16px var(--shadow-light);
}

.menu ul {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
  height: 68px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.menu ul li {
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transform: translateY(-30px);
  transition:
    opacity 0.25s,
    transform 0.25s;
  opacity: 0;
  transition-delay: var(--i);
}

.toggle.active ~ .menu ul li {
  opacity: 1;
  transform: translateY(0px);
  transition-delay: calc(0.75s + var(--i));
}

.menu ul li:nth-child(3) {
  width: 28px;
}

.menu ul li a {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 1.4em;
  text-decoration: none;
  color: var(--text);
  background: var(--bg);
  box-shadow:
    3px 3px 8px var(--shadow-dark),
    -3px -3px 8px var(--shadow-light);
  transition:
    box-shadow 0.2s,
    color 0.2s;
}

.menu li:hover a {
  color: var(--text-active);
  box-shadow:
    inset 2px 2px 6px var(--shadow-dark),
    inset -2px -2px 6px var(--shadow-light);
}

.divider {
  width: 1.5px;
  height: 28px;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--shadow-dark),
    transparent
  );
  border-radius: 2px;
  margin: auto;
}