/* ============================================
   SentraScan Platform - Loading States
   ============================================ */

/* ============================================
   Spinner Component
   ============================================ */

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--color-gray-200);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

.spinner-lg {
  width: 32px;
  height: 32px;
  border-width: 4px;
}

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

/* ============================================
   Progress Bar
   ============================================ */

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--color-gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--color-primary);
  transition: width var(--transition-base);
  border-radius: var(--radius-full);
}

.progress-bar-indeterminate {
  background: linear-gradient(
    90deg,
    var(--color-primary) 0%,
    var(--color-primary-light) 50%,
    var(--color-primary) 100%
  );
  background-size: 200% 100%;
  animation: progress-indeterminate 1.5s ease-in-out infinite;
}

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

/* ============================================
   Skeleton Screens
   ============================================ */

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

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

.skeleton-text {
  height: 1em;
  margin-bottom: var(--spacing-xs);
}

.skeleton-title {
  height: 1.5em;
  width: 60%;
  margin-bottom: var(--spacing-md);
}

.skeleton-card {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border-light);
}

/* ============================================
   Loading Overlay
   ============================================ */

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-index-modal);
  flex-direction: column;
  gap: var(--spacing-md);
}

.loading-overlay-message {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
}

/* ============================================
   Disabled States
   ============================================ */

.btn:disabled,
.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled,
button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.btn[aria-busy="true"],
button[aria-busy="true"] {
  opacity: 0.7;
  cursor: wait;
  pointer-events: none;
}

/* ============================================
   Loading Button States
   ============================================ */

.btn-loading {
  position: relative;
  color: transparent !important;
}

.btn-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}