/* Enhanced Loading Animations for Dashboard */

/* ============================================
   Meal Calculation Loader - Enhanced Styles
   ============================================ */

/* Integration with Design Tokens */
.meal-calculation-loader {
  --loader-primary: var(--fs-primary, #2563eb);
  --loader-accent: var(--fs-accent, #f08a12);
  --loader-success: var(--fs-success, #10b981);
  --loader-error: var(--fs-error, #ef4444);
  --loader-warning: var(--fs-warning, #f59e0b);
  --loader-text-primary: var(--fs-text-primary, #1a1a1a);
  --loader-text-secondary: var(--fs-text-secondary, #6b7280);
  --loader-bg-secondary: var(--fs-bg-secondary, #f8f9fa);
  --loader-shadow-md: var(--fs-shadow-md, 0 4px 8px rgba(0, 0, 0, 0.1));
  --loader-radius-lg: var(--fs-radius-lg, 12px);
  --loader-spacing-lg: var(--fs-spacing-lg, 16px);
}

/* Alternative Compact Layout for Inline Usage */
.meal-calculation-loader.compact {
  min-height: 180px;
  padding: 1.5rem 0.5rem;
}

.meal-calculation-loader.compact .food-combination-visual {
  height: 120px;
  margin-bottom: 1rem;
}

.meal-calculation-loader.compact .food-item {
  width: 48px;
  height: 48px;
  border-radius: 12px;
}

.meal-calculation-loader.compact .calculation-center {
  width: 56px;
  height: 56px;
}

/* Gradient Background Option */
.meal-calculation-loader.gradient-bg {
  background: linear-gradient(135deg, #ffffff 0%, #f0f4ff 50%, #fff7ed 100%);
  border-radius: var(--loader-radius-lg);
  box-shadow: var(--loader-shadow-md);
}

/* Enhanced Food Items with Brand Colors */
.food-item.protein-emphasis {
  background: linear-gradient(135deg, #ff4a3d 0%, #ff6b5e 100%) !important;
}

.food-item.carbs-emphasis {
  background: linear-gradient(
    135deg,
    var(--loader-primary) 0%,
    #60a5fa 100%
  ) !important;
}

.food-item.fats-emphasis {
  background: linear-gradient(
    135deg,
    var(--loader-warning) 0%,
    #fbbf24 100%
  ) !important;
}

/* Loading Container */
.loading-container {
  padding: 2rem;
  min-height: 400px;
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Skeleton Dashboard Layout */
.skeleton-dashboard {
  margin-top: 2rem;
  animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Food Selection Loading State */
.food-selection-loading {
  position: relative;
  overflow: hidden;
}

.food-selection-loading::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(248, 138, 18, 0.1) 50%,
    transparent 100%
  );
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% {
    left: -100%;
  }
  100% {
    left: 100%;
  }
}

/* Meal Card Loading Animation */
.meal-card-loading {
  background: linear-gradient(
    90deg,
    var(--fs-bg-secondary) 25%,
    #e9ecef 50%,
    var(--fs-bg-secondary) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 0.5rem;
  height: 120px;
  margin-bottom: 1rem;
}

/* Progress Bar Smooth Transitions */
.progress-bar {
  transition: width 0.6s ease-out;
}

/* Loading Step Text Animation */
.loading-step {
  animation: fadeInOut 1.5s ease-in-out infinite;
}

@keyframes fadeInOut {
  0%,
  100% {
    opacity: 0.7;
  }
  50% {
    opacity: 1;
  }
}

/* Staggered Loading Animation for List Items */
.loading-item {
  opacity: 0;
  animation: fadeInUp 0.4s ease-out forwards;
}

.loading-item:nth-child(1) {
  animation-delay: 0.1s;
}
.loading-item:nth-child(2) {
  animation-delay: 0.2s;
}
.loading-item:nth-child(3) {
  animation-delay: 0.3s;
}
.loading-item:nth-child(4) {
  animation-delay: 0.4s;
}
.loading-item:nth-child(5) {
  animation-delay: 0.5s;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Spinner Variations */
.spinner-dots {
  display: inline-flex;
  gap: 0.3rem;
}

.spinner-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--bs-primary);
  animation: dotPulse 1.4s infinite ease-in-out both;
}

.spinner-dots span:nth-child(1) {
  animation-delay: -0.32s;
}
.spinner-dots span:nth-child(2) {
  animation-delay: -0.16s;
}

@keyframes dotPulse {
  0%,
  80%,
  100% {
    transform: scale(0);
    opacity: 0.5;
  }
  40% {
    transform: scale(1);
    opacity: 1;
  }
}

/* Success Animation - successPulse keyframes defined in animations.css */
.loading-success {
  animation: successPulse 0.5s ease-out;
}

/* Error Animation - errorShake keyframes defined in animations.css */
.loading-error {
  animation: errorShake 0.5s ease-out;
}

/* Optimized Performance with GPU Acceleration */
.loading-spinner,
.skeleton-card,
.skeleton-list-item,
.progress-bar {
  will-change: transform, opacity;
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  .skeleton-card,
  .skeleton-list-item {
    background: #2d2d2d;
  }

  .skeleton-line,
  .skeleton-avatar {
    background: linear-gradient(90deg, #3d3d3d 25%, #4d4d4d 50%, #3d3d3d 75%);
  }
}

/* Mobile Optimizations */
@media (max-width: 768px) {
  .loading-container {
    padding: 1rem;
  }

  .skeleton-card {
    height: 100px;
  }

  @keyframes fadeInUp {
    from {
      transform: translateY(5px);
    }
  }
}