/* ========================================
   LOADING STATES - Spinners & Buttons
   ======================================== */

/* Universal loading spinner */
.loading-spinner {
  display: inline-block;
  flex-shrink: 0;
}

.loading-spinner svg {
  display: block;
}

/* Spin animation */
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.animate-spin {
  animation: spin 1s linear infinite;
}

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

/* Button loading state */
.btn-loading {
  position: relative;
  cursor: not-allowed;
  opacity: 0.75;
  pointer-events: none;
}

.btn-loading:hover {
  transform: none !important;
  box-shadow: none !important;
}

/* Inline loading indicator (for text areas) */
.loading-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  animation: pulse-subtle 2s ease-in-out infinite;
}

@keyframes pulse-subtle {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* Skeleton loading (for content placeholders) */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-surface-hover) 0%,
    var(--bg-surface) 50%,
    var(--bg-surface-hover) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: 0.375rem;
}

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

/* Skeleton variants */
.skeleton-text {
  height: 1rem;
  margin-bottom: 0.5rem;
}

.skeleton-title {
  height: 1.5rem;
  width: 60%;
  margin-bottom: 0.75rem;
}

.skeleton-avatar {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
}

.skeleton-card {
  height: 12rem;
  border-radius: 0.75rem;
}

/* Loading overlay (for sections) */
.loading-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(2px);
  z-index: 10;
  border-radius: inherit;
}

html.dark .loading-overlay,
html[data-mode="dark"] .loading-overlay {
  background: rgba(0, 0, 0, 0.5);
}

.loading-overlay-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--bg-surface);
  border-radius: 0.75rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.loading-overlay-text {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
}

/* Disabled state (general utility) */
.disabled,
[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}