/* ==========================================================================
   Modern Utilities - Phase 1 Bootstrap Modernization
   Smart Learner UI Enhancement
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette - Keeping existing teal as primary */
  --sl-primary: #01818D;
  --sl-primary-light: #bce9ed;
  --sl-primary-dark: #016770;

  /* Complementary colors for modern palette */
  --sl-secondary: #686868;
  --sl-accent: #ff6b35;
  --sl-success: #10b981;
  --sl-warning: #f59e0b;
  --sl-danger: #ef4444;

  /* Neutral scale */
  --sl-gray-50: #f9fafb;
  --sl-gray-100: #f3f4f6;
  --sl-gray-200: #e5e7eb;
  --sl-gray-300: #d1d5db;
  --sl-gray-400: #9ca3af;
  --sl-gray-500: #6b7280;
  --sl-gray-600: #4b5563;
  --sl-gray-700: #374151;
  --sl-gray-800: #1f2937;
  --sl-gray-900: #111827;

  /* Border radius tokens - more modern, softer corners */
  --sl-radius-sm: 0.375rem;
  --sl-radius-md: 0.5rem;
  --sl-radius-lg: 0.75rem;
  --sl-radius-xl: 1rem;
  --sl-radius-2xl: 1.5rem;
  --sl-radius-full: 9999px;

  /* Shadow tokens - modern layered shadows */
  --sl-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --sl-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --sl-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --sl-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --sl-shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);

  /* Colored shadows for cards */
  --sl-shadow-primary: 0 10px 15px -3px rgb(1 129 141 / 0.15), 0 4px 6px -4px rgb(1 129 141 / 0.1);

  /* Transition tokens */
  --sl-transition-fast: 150ms ease;
  --sl-transition-base: 200ms ease;
  --sl-transition-slow: 300ms ease;
  --sl-transition-slower: 500ms ease;

  /* Typography - Modern font stack with Inter */
  --sl-font-sans: 'Inter', 'Roboto', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --sl-font-display: 'Montserrat', 'Inter', system-ui, sans-serif;
}

/* --------------------------------------------------------------------------
   Hover Lift Utility - Card hover effects
   -------------------------------------------------------------------------- */
.hover-lift {
  transition: transform var(--sl-transition-base),
              box-shadow var(--sl-transition-base);
  will-change: transform, box-shadow;
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--sl-shadow-lg);
}

/* Subtle version for less dramatic effect */
.hover-lift-sm {
  transition: transform var(--sl-transition-fast),
              box-shadow var(--sl-transition-fast);
  will-change: transform, box-shadow;
}

.hover-lift-sm:hover {
  transform: translateY(-2px);
  box-shadow: var(--sl-shadow-md);
}

/* Primary colored shadow on hover */
.hover-lift-primary {
  transition: transform var(--sl-transition-base),
              box-shadow var(--sl-transition-base);
  will-change: transform, box-shadow;
}

.hover-lift-primary:hover {
  transform: translateY(-4px);
  box-shadow: var(--sl-shadow-primary);
}

/* --------------------------------------------------------------------------
   Transition Utilities
   -------------------------------------------------------------------------- */
.transition-all {
  transition: all var(--sl-transition-base);
}

.transition-fast {
  transition: all var(--sl-transition-fast);
}

.transition-slow {
  transition: all var(--sl-transition-slow);
}

.transition-colors {
  transition: color var(--sl-transition-base),
              background-color var(--sl-transition-base),
              border-color var(--sl-transition-base);
}

.transition-transform {
  transition: transform var(--sl-transition-base);
}

.transition-shadow {
  transition: box-shadow var(--sl-transition-base);
}

.transition-opacity {
  transition: opacity var(--sl-transition-base);
}

/* --------------------------------------------------------------------------
   Modern Shadow Utilities
   -------------------------------------------------------------------------- */
.shadow-sm-sl {
  box-shadow: var(--sl-shadow-sm);
}

.shadow-md-sl {
  box-shadow: var(--sl-shadow-md);
}

.shadow-lg-sl {
  box-shadow: var(--sl-shadow-lg);
}

.shadow-xl-sl {
  box-shadow: var(--sl-shadow-xl);
}

.shadow-2xl-sl {
  box-shadow: var(--sl-shadow-2xl);
}

.shadow-primary-sl {
  box-shadow: var(--sl-shadow-primary);
}

/* --------------------------------------------------------------------------
   Modern Border Radius Utilities
   -------------------------------------------------------------------------- */
.rounded-sm-sl {
  border-radius: var(--sl-radius-sm);
}

.rounded-md-sl {
  border-radius: var(--sl-radius-md);
}

.rounded-lg-sl {
  border-radius: var(--sl-radius-lg);
}

.rounded-xl-sl {
  border-radius: var(--sl-radius-xl);
}

.rounded-2xl-sl {
  border-radius: var(--sl-radius-2xl);
}

/* --------------------------------------------------------------------------
   Modern Card Styles
   -------------------------------------------------------------------------- */
.card-modern {
  border-radius: var(--sl-radius-lg);
  box-shadow: var(--sl-shadow-sm);
  border: 1px solid var(--sl-gray-200);
  transition: transform var(--sl-transition-base),
              box-shadow var(--sl-transition-base),
              border-color var(--sl-transition-base);
  overflow: hidden;
}

.card-modern:hover {
  transform: translateY(-4px);
  box-shadow: var(--sl-shadow-lg);
  border-color: var(--sl-gray-300);
}

/* Card with primary accent on hover */
.card-modern-primary {
  border-radius: var(--sl-radius-lg);
  box-shadow: var(--sl-shadow-sm);
  border: 1px solid var(--sl-gray-200);
  transition: transform var(--sl-transition-base),
              box-shadow var(--sl-transition-base),
              border-color var(--sl-transition-base);
  overflow: hidden;
}

.card-modern-primary:hover {
  transform: translateY(-4px);
  box-shadow: var(--sl-shadow-primary);
  border-color: var(--sl-primary-light);
}

/* Subtle card - no lift, just shadow change */
.card-subtle {
  border-radius: var(--sl-radius-lg);
  box-shadow: var(--sl-shadow-sm);
  border: 1px solid var(--sl-gray-200);
  transition: box-shadow var(--sl-transition-base),
              border-color var(--sl-transition-base);
}

.card-subtle:hover {
  box-shadow: var(--sl-shadow-md);
  border-color: var(--sl-gray-300);
}

/* --------------------------------------------------------------------------
   Image Hover Effects (for card thumbnails)
   -------------------------------------------------------------------------- */
.img-zoom-container {
  overflow: hidden;
}

.img-zoom {
  transition: transform var(--sl-transition-slow);
}

.img-zoom-container:hover .img-zoom,
.card:hover .img-zoom {
  transform: scale(1.05);
}

/* --------------------------------------------------------------------------
   Focus States (Accessibility)
   -------------------------------------------------------------------------- */
.focus-ring-primary:focus {
  outline: 2px solid var(--sl-primary);
  outline-offset: 2px;
}

.focus-ring-primary:focus:not(:focus-visible) {
  outline: none;
}

/* --------------------------------------------------------------------------
   Color Utilities
   -------------------------------------------------------------------------- */
.text-primary-sl {
  color: var(--sl-primary);
}

.text-secondary-sl {
  color: var(--sl-secondary);
}

.bg-primary-sl {
  background-color: var(--sl-primary);
}

.bg-primary-light-sl {
  background-color: var(--sl-primary-light);
}

.border-primary-sl {
  border-color: var(--sl-primary);
}

/* --------------------------------------------------------------------------
   Reduced Motion Support (Accessibility)
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .hover-lift,
  .hover-lift-sm,
  .hover-lift-primary,
  .transition-all,
  .transition-fast,
  .transition-slow,
  .transition-colors,
  .transition-transform,
  .transition-shadow,
  .transition-opacity,
  .card-modern,
  .card-modern-primary,
  .card-subtle,
  .img-zoom {
    transition: none;
  }

  .hover-lift:hover,
  .hover-lift-sm:hover,
  .hover-lift-primary:hover,
  .card-modern:hover,
  .card-modern-primary:hover {
    transform: none;
  }
}