/* Skeleton Loaders pour améliorer la fluidité perçue */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-border) 25%,
    #f0f0f0 50%,
    var(--color-border) 75%
  );
  background-size: 200% 100%;
  animation: loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

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

.skeleton-note-card {
  height: 200px;
  margin-bottom: var(--spacing-lg);
}

.skeleton-todo {
  height: 40px;
  margin-bottom: var(--spacing-sm);
}

.skeleton-rss-article {
  height: 80px;
  margin-bottom: var(--spacing-md);
}

/* Loading indicators */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(102, 126, 234, 0.1);
  border-radius: 50%;
  border-top-color: var(--color-accent);
  animation: spinner 0.6s linear infinite;
}

@keyframes spinner {
  to {
    transform: rotate(360deg);
  }
}

.loading-overlay {
  position: fixed;
  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: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.loading-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.loading-content {
  text-align: center;
  padding: 30px;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.loading-content .loading-spinner {
  width: 50px;
  height: 50px;
  border-width: 4px;
  margin-bottom: 15px;
}

.loading-content p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

/* Refresh indicator */
.refresh-indicator {
  position: fixed;
  top: 80px;
  right: 20px;
  background: var(--color-accent);
  color: white;
  padding: 8px 16px;
  border-radius: var(--radius-lg);
  font-size: var(--font-size-xs);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.3s;
  pointer-events: none;
  z-index: 1000;
}

.refresh-indicator.active {
  opacity: 1;
  transform: translateY(0);
}

.refresh-indicator .loading-spinner {
  width: 14px;
  height: 14px;
  border-width: 2px;
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: white;
}

/* Optimistic UI */
.optimistic-update {
  opacity: 0.6;
  pointer-events: none;
}

/* Smooth fade in */
.fade-in {
  animation: fadeIn 0.3s ease-in;
}

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

/* Empty state avec animation */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-secondary);
  animation: fadeIn 0.5s ease-in;
}

.empty-state-icon {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state-text {
  font-size: var(--font-size-base);
  margin-bottom: 8px;
}

.empty-state-hint {
  font-size: var(--font-size-sm);
  opacity: 0.7;
}