/* APL Utility Classes - Global utility layer */

/* Flexbox */
.u-flex { display: flex; }
.u-flex-center { display: flex; align-items: center; justify-content: center; }
.u-flex-between { display: flex; justify-content: space-between; align-items: center; }
.u-flex-column { display: flex; flex-direction: column; }
.u-flex-wrap { flex-wrap: wrap; }

/* Spacing - Margin */
.u-m-0 { margin: 0; }
.u-mt-1 { margin-top: var(--spacing-sm); }
.u-mt-2 { margin-top: var(--spacing-md); }
.u-mt-3 { margin-top: var(--spacing-lg); }
.u-mb-1 { margin-bottom: var(--spacing-sm); }
.u-mb-2 { margin-bottom: var(--spacing-md); }
.u-mb-3 { margin-bottom: var(--spacing-lg); }
.u-mx-auto { margin-left: auto; margin-right: auto; }

/* Spacing - Padding */
.u-p-0 { padding: 0; }
.u-p-1 { padding: var(--spacing-sm); }
.u-p-2 { padding: var(--spacing-md); }
.u-p-3 { padding: var(--spacing-lg); }
.u-px-2 { padding-left: var(--spacing-md); padding-right: var(--spacing-md); }
.u-py-2 { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }

/* Typography */
.u-text-primary { color: var(--color-text-primary); }
.u-text-secondary { color: var(--color-text-secondary); }
.u-text-success { color: var(--color-success); }
.u-text-error { color: var(--color-error); }
.u-text-warning { color: var(--color-warning); }
.u-text-info { color: var(--color-info); }
.u-text-center { text-align: center; }
.u-text-right { text-align: right; }
.u-text-left { text-align: left; }
.u-font-bold { font-weight: var(--font-bold); }
.u-font-medium { font-weight: var(--font-medium); }

/* Display */
.u-hidden { display: none !important; }
.u-visible { display: block; }
.u-invisible { visibility: hidden; }
.u-sr-only { 
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* Width */
.u-w-full { width: 100%; }
.u-w-auto { width: auto; }
.u-max-w-sm { max-width: 640px; }
.u-max-w-md { max-width: 768px; }
.u-max-w-lg { max-width: 1024px; }

/* Responsive utilities */
@media (max-width: 768px) {
  .u-hidden-mobile { display: none !important; }
  .u-visible-mobile { display: block !important; }
}

@media (min-width: 769px) {
  .u-hidden-desktop { display: none !important; }
  .u-visible-desktop { display: block !important; }
}

/* Touch targets - ensure minimum 44x44px */
.u-touch-target {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Loading states */
.u-loading {
  position: relative;
  pointer-events: none;
  opacity: 0.6;
}

.u-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--color-primary-100);
  border-top-color: var(--color-primary-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Focus states for accessibility */
.u-focus-visible:focus {
  outline: 2px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* Error states */
.u-error {
  border-color: var(--color-error) !important;
  color: var(--color-error);
}

/* Success states */
.u-success {
  border-color: var(--color-success) !important;
  color: var(--color-success);
}