.chapter-sub-menu {
    display: none;
    margin-left: 0;
    padding-left: 0;
}

.chapter-menu {
  background: var(--neutral-100);
  border-radius: 1rem;
  overflow: hidden;
}

.chapter-menu h3 {
  background: var(--dark-blue);
    font-size: 1rem;
    color: white;
    text-align: center;
    margin: 0;
    padding: 1rem;
}

.wp-admin .chapter-menu h3 {
    color: var(--dark-blue);
}

.apda-chapter-menu {
    display: flex;
    flex-direction: column;
    padding-left: 0;
    margin: 0;
}

.chapter-menu-dropdown-container {
    display: flex;
    flex-basis: 25%;
    position: relative;
    cursor: pointer;
}

.chapter-menu-dropdown {
    border-left: 0.75rem solid #b1b1b1;
    border-right: 0.75rem solid transparent;
    border-top: 0.5rem solid transparent;
    border-bottom: 0.5rem solid transparent;
    cursor: pointer;
    position: absolute;
    top: 1.25rem;
    right: 0.5rem;
}

.show .chapter-sub-menu {
    display: flex;
    flex-direction: column;
    background: var(--neutral-100);
    transition: display 0.25s linear;
}

.apda-chapter-menu > li,
.chapter-sub-menu > li {
    list-style-type: none;
    padding: 0;
    margin: 0;
    position: relative;
}

li.show ul.chapter-sub-menu li {
    background: var(--neutral-300);
}

.show > .chapter-menu-link-container > .chapter-menu-dropdown-container > .chapter-menu-dropdown {
    border-left: 0.5rem solid transparent;
    border-right: 0.5rem solid transparent;
    border-top: 0.75rem solid #777777;
    border-bottom: 0.75rem solid transparent;
    cursor: pointer;
    position: absolute;
    top: 1.5rem;
    right: 1.25rem;
}

.chapter-menu li a {
    display: flex;
    flex-basis: 75%;
    color: var(--dark-blue);
    padding: 0.5rem;
    margin: 0.5rem;
    text-decoration: none;
}

.chapter-menu li a:hover {
    background: none;
    text-decoration: underline;
}

.chapter-menu-link-container {
    display: flex;
}

.chapter-menu ul.apda-chapter-menu .sub-menu {
    display: none;
    padding-left: 0.5rem;
}

.chapter-menu ul.apda-chapter-menu .chapter-sub-menu > li.show .sub-menu  {
    display: flex;
    flex-direction: column;
}