html {
  font-size: 14px;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
  box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
}

html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 60px;
}

/* Nested Dropdown Styles */
.dropdown-submenu {
  position: relative;
}

.dropdown-submenu > .dropdown-menu {
  top: 0;
  left: 100%;
  margin-top: -1px;
  display: none;
}

.dropdown-submenu:hover > .dropdown-menu {
  display: block;
}

.dropdown-submenu > .dropdown-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 500;
  color: #495057;
  background-color: #f8f9fa;
}

.dropdown-submenu > .dropdown-item:hover {
  background-color: #e9ecef;
  color: #212529;
}

.dropdown-submenu > .dropdown-item::after {
  content: "▸";
  margin-left: auto;
  padding-left: 0.5rem;
}

/* Mobile: Stack categories vertically */
@media (max-width: 767px) {
  .dropdown-submenu > .dropdown-menu {
    position: static;
    left: 0;
    margin-left: 1rem;
    box-shadow: none;
    border: none;
    border-left: 2px solid #dee2e6;
  }

  .dropdown-submenu > .dropdown-item::after {
    content: "▾";
  }

  .dropdown-submenu > .dropdown-item {
    cursor: pointer;
  }

  /* Show submenu on click for mobile */
  .dropdown-submenu.show > .dropdown-menu {
    display: block;
  }
  
  /* Mobile canvas and game responsive */
  canvas {
    max-width: 100% !important;
    height: auto !important;
  }
  
  #snakeCanvas {
    width: 100% !important;
    max-width: 400px !important;
  }
  
  #pongCanvas {
    width: 100% !important;
    max-width: 800px !important;
  }
}