/* Enhanced Dark Mode Toggle Styles */
.dark-mode-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  padding: 0.75rem;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(249, 250, 251, 0.9));
  border: 2px solid rgba(229, 231, 235, 0.8);
  box-shadow: 
    0 8px 16px -4px rgba(0, 0, 0, 0.1),
    0 4px 8px -2px rgba(0, 0, 0, 0.05),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dark .dark-mode-toggle {
  background: linear-gradient(135deg, rgba(31, 41, 55, 0.95), rgba(17, 24, 39, 0.9));
  border-color: rgba(75, 85, 99, 0.8);
  box-shadow: 
    0 8px 16px -4px rgba(0, 0, 0, 0.3),
    0 4px 8px -2px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.dark-mode-toggle:hover {
  transform: scale(1.1) rotate(15deg);
  box-shadow: 
    0 12px 24px -6px rgba(0, 0, 0, 0.15),
    0 6px 12px -3px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.dark .dark-mode-toggle:hover {
  box-shadow: 
    0 12px 24px -6px rgba(0, 0, 0, 0.4),
    0 6px 12px -3px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.dark-mode-icon {
  display: block;
  font-size: 1.5rem;
  line-height: 1;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.dark .dark-mode-icon {
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.dark-mode-toggle:hover .dark-mode-icon {
  transform: scale(1.1);
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.dark .dark-mode-toggle:hover .dark-mode-icon {
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.4));
}

/* Smooth transitions for all elements */
* {
  transition-property: background-color, border-color, color, fill, stroke;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 200ms;
}

/* Ensure proper contrast in dark mode */
.dark {
  color-scheme: dark;
}

/* Custom scrollbar for dark mode */
.dark ::-webkit-scrollbar {
  width: 8px;
}

.dark ::-webkit-scrollbar-track {
  background: #374151;
}

.dark ::-webkit-scrollbar-thumb {
  background: #6b7280;
  border-radius: 4px;
}

.dark ::-webkit-scrollbar-thumb:hover {
  background: #9ca3af;
}
/* Enhanced Dark Mode Animations */
@keyframes theme-switch {
  0% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.2) rotate(180deg); }
  100% { transform: scale(1) rotate(360deg); }
}

.dark-mode-toggle.switching .dark-mode-icon {
  animation: theme-switch 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Enhanced Glow Effects */
.dark-mode-toggle::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 50%;
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}

.dark-mode-toggle:hover::before {
  opacity: 0.3;
}

.dark .dark-mode-toggle:hover::before {
  opacity: 0.5;
}

/* Improved Focus States */
.dark-mode-toggle:focus {
  outline: none;
  box-shadow: 
    0 0 0 3px rgba(99, 102, 241, 0.3),
    0 8px 16px -4px rgba(0, 0, 0, 0.1),
    0 4px 8px -2px rgba(0, 0, 0, 0.05);
}

.dark .dark-mode-toggle:focus {
  box-shadow: 
    0 0 0 3px rgba(99, 102, 241, 0.5),
    0 8px 16px -4px rgba(0, 0, 0, 0.3),
    0 4px 8px -2px rgba(0, 0, 0, 0.2);
}

/* Theme Transition Overlay */
.theme-transition-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), 
    transparent 0%, 
    rgba(0, 0, 0, 0.1) 50%, 
    rgba(0, 0, 0, 0.2) 100%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 9999;
}

.theme-transition-overlay.active {
  opacity: 1;
}

/* Enhanced Card Shadows in Dark Mode */
.dark .card,
.dark .lesson-nav-item,
.dark .exercise-progress-item {
  box-shadow: 
    0 4px 6px -1px rgba(0, 0, 0, 0.3),
    0 2px 4px -1px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.dark .card:hover,
.dark .lesson-nav-item:hover,
.dark .exercise-progress-item:hover {
  box-shadow: 
    0 10px 15px -3px rgba(0, 0, 0, 0.4),
    0 4px 6px -2px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

/* Subtle Border Glow Effects */
.dark .card,
.dark .exercise-progress-item,
.dark .lesson-nav-item {
  border-image: linear-gradient(135deg, 
    rgba(75, 85, 99, 0.8), 
    rgba(55, 65, 81, 0.6), 
    rgba(75, 85, 99, 0.8)) 1;
}

.dark .exercise-progress-item--current {
  border-image: linear-gradient(135deg, 
    rgba(99, 102, 241, 0.8), 
    rgba(59, 130, 246, 0.6), 
    rgba(99, 102, 241, 0.8)) 1;
  box-shadow: 
    0 0 20px rgba(99, 102, 241, 0.3),
    0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.dark .exercise-progress-item--completed {
  border-image: linear-gradient(135deg, 
    rgba(34, 197, 94, 0.8), 
    rgba(16, 185, 129, 0.6), 
    rgba(34, 197, 94, 0.8)) 1;
  box-shadow: 
    0 0 15px rgba(34, 197, 94, 0.2),
    0 4px 6px -1px rgba(0, 0, 0, 0.3);
}