/* frontend/public/css/loading.css - Loading States & Transitions */

/* Loading screen styles - Anti-Flickering */
.loading-screen {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(4px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  /* Prevent flickering */
  will-change: opacity;
  backface-visibility: hidden;
  transform: translateZ(0);
}

.loading-logo {
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

/* Pulse animation for loading elements */
.loading-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .5; }
}

/* Skeleton loading for content */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 1rem;
  border-radius: 0.25rem;
}

.skeleton-title {
  height: 1.5rem;
  border-radius: 0.25rem;
}

.skeleton-button {
  height: 2.5rem;
  border-radius: 0.5rem;
}

.skeleton-card {
  height: 8rem;
  border-radius: 0.75rem;
}

/* Smooth content transitions */
.content-fade-in {
  animation: fadeIn 0.5s ease-out;
}

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

/* Loading spinner for buttons */
.spinner {
  display: inline-block;
  width: 1rem;
  height: 1rem;
  border: 2px solid #ffffff33;
  border-top: 2px solid #ffffff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Shimmer effect for loading cards */
.shimmer {
  position: relative;
  overflow: hidden;
  background-color: #f6f7f8;
}

.shimmer::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.6),
    transparent
  );
  animation: shimmer 1.5s infinite;
}

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

/* Loading states for forms */
.form-loading {
  position: relative;
  pointer-events: none;
  opacity: 0.7;
}

.form-loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

/* Prevent layout shift during loading */
.layout-stable {
  min-height: 400px;
}

/* Loading dots animation */
.loading-dots {
  display: inline-flex;
  gap: 0.25rem;
}

.loading-dots span {
  width: 0.5rem;
  height: 0.5rem;
  background: currentColor;
  border-radius: 50%;
  animation: loadingDots 1.4s infinite ease-in-out;
}

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

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

/* Progress bar styles */
.progress-bar {
  width: 100%;
  height: 0.25rem;
  background-color: #e5e7eb;
  border-radius: 0.125rem;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #1d4ed8);
  border-radius: 0.125rem;
  transition: width 0.3s ease;
  animation: progressShimmer 2s infinite;
}

@keyframes progressShimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Responsive loading states */
@media (max-width: 640px) {
  .loading-screen {
    padding: 1rem;
  }

  .skeleton-card {
    height: 6rem;
  }
}