/**
 * ================================
 * BLUECART GLOBAL LOADING SPINNER
 * ================================
 * Unified loading spinner system for the entire BlueCart website
 * 
 * Features:
 * - Accessible and WCAG compliant
 * - Responsive design for all devices
 * - Reduced motion support
 * - Dark/light theme support
 * - Modern animations
 * 
 * Version: 1.0.0
 */

/* ========================================
   LOADING SPINNER OVERLAY
   ======================================== */
.bluecart-loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.bluecart-loading-overlay.visible {
  opacity: 1;
  visibility: visible;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  .bluecart-loading-overlay {
    background: rgba(15, 23, 42, 0.95);
  }
}

/* ========================================
   LOADING SPINNER CONTAINER
   ======================================== */
.bluecart-loading-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-8, 2rem);
  background: var(--bg-primary, white);
  border-radius: var(--radius-2xl, 1rem);
  box-shadow: var(--shadow-2xl, 0 25px 50px -12px rgba(0, 0, 0, 0.25));
  border: 1px solid var(--slate-200, #e2e8f0);
  max-width: 400px;
  min-width: 300px;
  margin: 0 var(--spacing-4, 1rem);
  transform: scale(0.9) translateY(20px);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.bluecart-loading-overlay.visible .bluecart-loading-container {
  transform: scale(1) translateY(0);
}

/* ========================================
   SPINNER ANIMATION
   ======================================== */
.bluecart-spinner {
  width: 60px;
  height: 60px;
  margin-bottom: var(--spacing-6, 1.5rem);
  position: relative;
}

.bluecart-spinner-circle {
  width: 100%;
  height: 100%;
  border: 4px solid var(--slate-200, #e2e8f0);
  border-top: 4px solid var(--bluecart-primary, #2e86c1);
  border-radius: 50%;
  animation: bluecart-spin 1s linear infinite;
  position: relative;
}

.bluecart-spinner-circle::before {
  content: '';
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  border: 2px solid transparent;
  border-top: 2px solid var(--bluecart-secondary, #7c3aed);
  border-radius: 50%;
  animation: bluecart-spin-reverse 2s linear infinite;
}

@keyframes bluecart-spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes bluecart-spin-reverse {
  0% { transform: rotate(360deg); }
  100% { transform: rotate(0deg); }
}

/* ========================================
   SPINNER TEXT CONTENT
   ======================================== */
.bluecart-loading-text {
  color: var(--text-primary, #1e293b);
  margin-bottom: var(--spacing-2, 0.5rem);
}

.bluecart-loading-message {
  font-size: var(--font-size-lg, 1.125rem);
  font-weight: var(--font-weight-semibold, 600);
  line-height: 1.4;
  margin-bottom: var(--spacing-2, 0.5rem);
}

.bluecart-loading-subtitle {
  font-size: var(--font-size-sm, 0.875rem);
  color: var(--text-secondary, #64748b);
  line-height: 1.5;
  max-width: 280px;
}

/* ========================================
   PROGRESS INDICATOR
   ======================================== */
.bluecart-loading-progress {
  width: 100%;
  margin-top: var(--spacing-4, 1rem);
}

.bluecart-progress-bar {
  width: 100%;
  height: 4px;
  background: var(--slate-200, #e2e8f0);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}

.bluecart-progress-fill {
  height: 100%;
  background: var(--gradient-primary, linear-gradient(135deg, #2e86c1 0%, #7c3aed 100%));
  border-radius: 2px;
  width: 0%;
  transition: width 0.3s ease;
  position: relative;
}

.bluecart-progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: bluecart-progress-shimmer 2s ease-in-out infinite;
}

@keyframes bluecart-progress-shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ========================================
   OPERATION COUNTER
   ======================================== */
.bluecart-operation-counter {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2, 0.5rem);
  background: var(--slate-100, #f1f5f9);
  color: var(--text-secondary, #64748b);
  padding: var(--spacing-1, 0.25rem) var(--spacing-3, 0.75rem);
  border-radius: var(--radius-lg, 0.5rem);
  font-size: var(--font-size-xs, 0.75rem);
  font-weight: var(--font-weight-medium, 500);
  margin-top: var(--spacing-2, 0.5rem);
}

.bluecart-operation-counter .counter-icon {
  width: 12px;
  height: 12px;
  animation: bluecart-pulse 2s ease-in-out infinite;
}

@keyframes bluecart-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ========================================
   MOBILE RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
  .bluecart-loading-container {
    min-width: 280px;
    padding: var(--spacing-6, 1.5rem);
    margin: 0 var(--spacing-4, 1rem);
  }

  .bluecart-spinner {
    width: 50px;
    height: 50px;
    margin-bottom: var(--spacing-4, 1rem);
  }

  .bluecart-loading-message {
    font-size: var(--font-size-base, 1rem);
  }

  .bluecart-loading-subtitle {
    font-size: var(--font-size-xs, 0.75rem);
  }
}

@media (max-width: 480px) {
  .bluecart-loading-container {
    min-width: 260px;
    padding: var(--spacing-4, 1rem);
  }

  .bluecart-spinner {
    width: 40px;
    height: 40px;
  }
}

/* ========================================
   ACCESSIBILITY FEATURES
   ======================================== */

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  .bluecart-spinner-circle,
  .bluecart-spinner-circle::before,
  .bluecart-progress-fill::after {
    animation: none !important;
  }

  .bluecart-loading-container {
    transition: none !important;
  }

  .bluecart-loading-overlay {
    transition: none !important;
  }

  /* Simplified spinner for reduced motion */
  .bluecart-spinner-circle {
    border: 4px solid var(--slate-200, #e2e8f0);
    border-top: 4px solid var(--bluecart-primary, #2e86c1);
    opacity: 0.8;
  }

  .bluecart-spinner-circle::before {
    display: none;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .bluecart-loading-container {
    border-width: 2px;
    border-color: currentColor;
  }

  .bluecart-spinner-circle {
    border-width: 6px;
  }

  .bluecart-loading-text {
    font-weight: var(--font-weight-bold, 700);
  }
}

/* Focus management - Ensure screen readers can access the loading state */
.bluecart-loading-overlay[aria-hidden="false"] {
  /* Screen reader accessibility is handled via ARIA attributes in JS */
}

/* Screen reader only text */
.bluecart-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================
   THEME VARIANTS
   ======================================== */

/* Dark theme */
.bluecart-loading-overlay.theme-dark {
  background: rgba(15, 23, 42, 0.95);
}

.bluecart-loading-overlay.theme-dark .bluecart-loading-container {
  background: var(--slate-800, #1e293b);
  border-color: var(--slate-700, #334155);
  color: var(--text-light, #f8fafc);
}

.bluecart-loading-overlay.theme-dark .bluecart-loading-text {
  color: var(--text-light, #f8fafc);
}

.bluecart-loading-overlay.theme-dark .bluecart-loading-subtitle {
  color: var(--text-light-secondary, #cbd5e1);
}

.bluecart-loading-overlay.theme-dark .bluecart-operation-counter {
  background: var(--slate-700, #334155);
  color: var(--text-light-secondary, #cbd5e1);
}

/* Light theme (default) */
.bluecart-loading-overlay.theme-light {
  background: rgba(255, 255, 255, 0.95);
}

/* ========================================
   ANIMATIONS & TRANSITIONS
   ======================================== */

/* Entrance animation */
@keyframes bluecart-fade-in-up {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Exit animation */
@keyframes bluecart-fade-out-down {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(-30px) scale(0.9);
  }
}

/* Apply animations */
.bluecart-loading-overlay.entering .bluecart-loading-container {
  animation: bluecart-fade-in-up 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.bluecart-loading-overlay.exiting .bluecart-loading-container {
  animation: bluecart-fade-out-down 0.3s ease-in forwards;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

/* Hide scrollbar when loading */
.bluecart-loading-active {
  overflow: hidden !important;
}

/* Blur background content */
.bluecart-content-blurred {
  filter: blur(2px);
  transition: filter 0.3s ease;
}

/* No blur fallback */
@supports not (backdrop-filter: blur(8px)) {
  .bluecart-loading-overlay {
    background: rgba(255, 255, 255, 0.9);
  }

  .bluecart-loading-overlay.theme-dark {
    background: rgba(15, 23, 42, 0.9);
  }
}