ul.main-menu {
  display: flex;
  flex-direction: row;
  list-style: none;
  padding-inline-start: 0;
  align-items: center;
  width: -webkit-fill-available;
  margin-block: 0;
}
.main-menu li {
  text-align: center;
}
.main-menu li:last-child{
  margin-left: auto;
}
.main-menu li a,a:visited {
  cursor: pointer;
  padding: 0.5rem 1rem;
  border-radius: 0.25rem;
  transition:all;
  transition-duration: 300ms;
  color: var(--theme-light);
  text-decoration: none;
  box-shadow: -0.5rem 0 1rem var(--primary-dark) inset;
  display: inline-block;
  margin: -100% auto;
  min-width: 6vw;
}
.main-menu > li:last-child a{
  box-shadow: 0.5rem 0 1rem var(--primary-dark) inset;
}
.main-menu li a:hover {
  background-color: var(--secondary-dark);
  box-shadow: -0.5rem 0 1rem var(--secondary-colour) inset;
}
.main-menu li a.active {
  background-color: var(--secondary-dark);
  box-shadow: -0.5rem 0 1rem var(--secondary-colour) inset;
}

.main-menu > li {
  position: relative;
}
.submenu {
  position: absolute;
  top: 125%;
  left: 0;
  opacity: 0;
  transform: translateY(2rem);
  transition: all 0.3s ease;
  z-index: 1000;
  list-style: none;
  pointer-events: none;
}
.main-menu > li:hover .submenu {
  opacity: 1;
  transform: translateY(0.5rem);
  pointer-events: auto;
}
.submenu li {
  margin-block-end: 1rem;
}
.submenu a {
  display: block;
  background-color: var(--primary-colour);
  text-decoration: none;
}
.submenu a.active {
  background-color: var(--secondary-dark);
}
.dropdown-arrow {
  margin-left: 4px;
  font-size: 0.8em;
  display: inline-block;
  transition: transform 0.3s;
}
.main-menu > li:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.mobile-menu-toggle {
  display: none;
  min-height: 2rem;
  margin-left:auto;
  background: none;
  border: none;
  min-width: 2rem;
  position: relative;
  cursor: pointer;
}
.mobile-menu-toggle span {
  display: block;
  position: absolute;
  height: 3px;
  width: 100%;
  background: black;
  border-radius: 3px;
  left: 0;
  transition: all 0.3s;
}

.mobile-menu-toggle span:nth-child(1) { top: 20%; }
.mobile-menu-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.mobile-menu-toggle span:nth-child(3) { bottom: 20%; }

.main-menu.visible + .mobile-menu-toggle span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.main-menu.visible + .mobile-menu-toggle span:nth-child(2) {
  opacity: 0;
}
.main-menu.visible + .mobile-menu-toggle span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}


@media (max-width: 768px) {
  ul.main-menu {
    flex-direction: column;
    gap:1rem;
    display: none;
    width:100%;
  }
  ul.main-menu.visible {
    display: flex; 
    position: absolute;
    top: 100%;
    left: 0;
  }
  .main-menu li{
    width: 100%;
  }
  .main-menu li:last-child {
    margin-left: 0;
  }
  
  .main-menu li a {
    width: calc(100% - 2rem);
    background-color: var(--primary-colour);
    top: 125%;
  }
  .main-menu li:last-child a{
    box-shadow: -0.5rem 0 1rem var(--primary-dark) inset;
  }

  .mobile-menu-toggle { display: block; }

  .submenu {
    opacity: 1;
    position: inherit;
    margin-bottom: -1rem;
    transform: translateY(0);
    z-index: inherit;
    padding-inline: 0;
  }
  .main-menu > li:hover .submenu:hover {
    transform: translateY(0);
  }
  .dropdown-arrow { display:none; }
}