/* Theme Variables */
:root {
  /* Light Mode Colors */
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary-color: #14b8a6;
  --success-color: #22c55e;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --info-color: #3b82f6;
  --background-color: #ffffff;
  --card-background: #ffffff;
  --text-color: #1f2937;
  --text-muted: #6b7280;
  --border-color: #e5e7eb;
  --border-radius: 16px;
  --spacing: 24px;
  --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

/* Dark Mode Colors */
html.dark {
  --background-color: #111827;
  --card-background: #1f2937;
  --text-color: #f9fafb;
  --text-muted: #9ca3af;
  --border-color: #374151;
  --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
}

/* Theme Toggle Button */
.theme-toggle {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 1000;
  background: var(--card-background);
  border: 2px solid var(--border-color);
  border-radius: 50%;
  width: 56px;
  height: 56px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  box-shadow: var(--box-shadow);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
  border-color: var(--primary-color);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-toggle svg {
  width: 32px;
  height: 32px;
  fill: var(--text-color);
  transition: var(--transition);
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.theme-toggle .sun-icon {
  opacity: 1;
  visibility: visible;
}

.theme-toggle .moon-icon {
  opacity: 0;
  visibility: hidden;
}

html.dark .theme-toggle .sun-icon {
  opacity: 0;
  visibility: hidden;
}

html.dark .theme-toggle .moon-icon {
  opacity: 1;
  visibility: visible;
}

/* Responsive Theme Toggle */
@media (max-width: 768px) {
  .theme-toggle {
    top: 16px;
    right: 16px;
    width: 48px;
    height: 48px;
  }

  .theme-toggle svg {
    width: 28px;
    height: 28px;
  }
}

@media (max-width: 480px) {
  .theme-toggle {
    top: 12px;
    right: 12px;
    width: 44px;
    height: 44px;
    background: var(--card-background);
    border: 2px solid var(--border-color);
  }

  .theme-toggle svg {
    width: 24px;
    height: 24px;
  }
}