/* ==========================================================================
   Loading States and Spinners
   Modern loading indicators for async operations
   ========================================================================== */

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

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

@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

/* Base Spinner */
.spinner {
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  border: 3px solid var(--muted);
  border-top-color: var(--primary, #404041);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.spinner-sm {
  width: 1rem;
  height: 1rem;
  border-width: 2px;
}

.spinner-lg {
  width: 2.5rem;
  height: 2.5rem;
  border-width: 4px;
}

/* Loading Overlay */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-overlay.dark {
  background-color: rgba(0, 0, 0, 0.5);
}

/* Loading Container */
.loading-container {
  text-align: center;
  padding: 2rem;
}

.loading-container .spinner {
  margin: 0 auto 1rem;
  display: block;
}

.loading-text {
  color: var(--muted-foreground);
  font-size: 0.875rem;
  margin-top: 0.5rem;
}

/* Button Loading States */
.btn.loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.btn.loading::after {
  content: '';
  position: absolute;
  width: 1rem;
  height: 1rem;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  color: var(--bs-btn-color, white);
}

/* Tab Loading State */
.tab-pane.loading {
  position: relative;
  min-height: 200px;
}

.tab-pane.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 2rem;
  height: 2rem;
  border: 3px solid var(--muted);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* HTMX Loading Indicator */
.htmx-indicator {
  display: none;
  opacity: 0;
  transition: opacity 200ms ease-in;
}

.htmx-request .htmx-indicator {
  display: inline-block;
  opacity: 1;
}

.htmx-request.htmx-indicator {
  display: inline-block;
  opacity: 1;
}

/* Custom HTMX spinner for tabs */
.tab-loading-indicator {
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 100;
}

.htmx-request .tab-loading-indicator {
  display: block;
}

.tab-loading-indicator .spinner {
  width: 2rem;
  height: 2rem;
}

/* Skeleton Loading */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--muted) 25%,
    rgba(0, 0, 0, 0.05) 50%,
    var(--muted) 75%
  );
  background-size: 1000px 100%;
  animation: shimmer 2s infinite;
  border-radius: 0.25rem;
}

.skeleton-text {
  height: 1rem;
  margin-bottom: 0.5rem;
  border-radius: 0.25rem;
}

.skeleton-title {
  height: 1.5rem;
  width: 50%;
  margin-bottom: 1rem;
  border-radius: 0.25rem;
}

.skeleton-button {
  height: 2.5rem;
  width: 6rem;
  border-radius: 0.25rem;
}

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

/* Progress Bar */
.progress-loading {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--muted);
  z-index: 9999;
  overflow: hidden;
}

.progress-loading::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  height: 100%;
  width: 100%;
  background: var(--primary);
  animation: progress 2s linear infinite;
}

@keyframes progress {
  0% { left: -100%; }
  50% { left: 0%; }
  100% { left: 100%; }
}

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

.loading-dots span {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background-color: var(--primary);
  animation: pulse 1.4s infinite ease-in-out both;
}

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

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

/* Form Submit Loading */
form.submitting {
  pointer-events: none;
  opacity: 0.7;
}

form.submitting button[type="submit"] {
  position: relative;
  color: transparent !important;
}

form.submitting button[type="submit"]::after {
  content: '';
  position: absolute;
  width: 1rem;
  height: 1rem;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  color: var(--bs-btn-color, white);
}

/* Content Fade In */
.fade-in-content {
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Loading State for Cards */
.card.loading {
  position: relative;
  min-height: 150px;
}

.card.loading > * {
  opacity: 0.5;
}

.card.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 2rem;
  height: 2rem;
  border: 3px solid var(--muted);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Accessibility: Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .spinner,
  .btn.loading::after,
  .tab-pane.loading::after,
  .card.loading::after,
  form.submitting button[type="submit"]::after {
    animation: none;
    border-top-color: var(--primary);
    opacity: 0.8;
  }
  
  .skeleton {
    animation: none;
    background: var(--muted);
  }
  
  .progress-loading::before {
    animation: none;
    left: 0;
    width: 50%;
  }
  
  .loading-dots span {
    animation: none;
    opacity: 0.7;
  }
}