.vertical-menu {
  width: 100%;
  max-width: 400px;
  border: 1px solid #ddd;
}

.menu-item {
  border-bottom: 1px solid #ddd;
}

.menu-title {
  padding: 12px 15px;
  cursor: pointer;
  background: #f5f7f9;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
}

.menu-title:hover {
  background: #e9ecef;
}

.toggle {
  font-size: 20px;
  font-weight: bold;
   color: #555;;
}

.has-submenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
  background: #ffffff;
}

.has-submenu a {
  display: block;
  padding: 10px 20px;
  text-decoration: none;
  color: #333;
  border-top: 1px solid #f1f1f1;
}

.has-submenu a:hover {
  background: #f8f9fa;
  color: #4fa3b0;
}

/* ACTIVE STATE */
.menu-item.active .submenu {
  max-height: 500px;
}

.menu-item.active .toggle {
  transform: rotate(45deg); /* + becomes × */
}