/* =========================================================================
 * Aida AI Utilities v2
 * Single-purpose, single-property classes. Use to compose layouts without
 * writing custom CSS. Always combine with components — never as a
 * replacement for them.
 *
 * Naming: .u-<category>-<value>
 * ========================================================================= */

/* === Display ====================================================== */
.u-block { display: block; }
.u-inline { display: inline; }
.u-inline-block { display: inline-block; }
.u-flex { display: flex; }
.u-inline-flex { display: inline-flex; }
.u-grid { display: grid; }
.u-hidden { display: none; }
.u-invisible { visibility: hidden; }

/* === Flex helpers ================================================= */
.u-flex-row { flex-direction: row; }
.u-flex-col { flex-direction: column; }
.u-flex-wrap { flex-wrap: wrap; }
.u-flex-1 { flex: 1 1 0%; min-width: 0; }
.u-flex-auto { flex: 1 1 auto; }
.u-flex-none { flex: none; }
.u-items-start { align-items: flex-start; }
.u-items-center { align-items: center; }
.u-items-end { align-items: flex-end; }
.u-items-stretch { align-items: stretch; }
.u-justify-start { justify-content: flex-start; }
.u-justify-center { justify-content: center; }
.u-justify-end { justify-content: flex-end; }
.u-justify-between { justify-content: space-between; }
.u-justify-around { justify-content: space-around; }
.u-justify-evenly { justify-content: space-evenly; }

/* === Gap (flex/grid) ============================================== */
.u-gap-0 { gap: 0; }
.u-gap-1 { gap: var(--space-1); }
.u-gap-2 { gap: var(--space-2); }
.u-gap-3 { gap: var(--space-3); }
.u-gap-4 { gap: var(--space-4); }
.u-gap-5 { gap: var(--space-5); }
.u-gap-6 { gap: var(--space-6); }
.u-gap-8 { gap: var(--space-8); }

/* === Padding ====================================================== */
.u-p-0 { padding: 0; }
.u-p-1 { padding: var(--space-1); }
.u-p-2 { padding: var(--space-2); }
.u-p-3 { padding: var(--space-3); }
.u-p-4 { padding: var(--space-4); }
.u-p-5 { padding: var(--space-5); }
.u-p-6 { padding: var(--space-6); }
.u-p-8 { padding: var(--space-8); }
.u-p-10 { padding: var(--space-10); }
.u-p-12 { padding: var(--space-12); }

.u-px-2 { padding-left: var(--space-2); padding-right: var(--space-2); }
.u-px-3 { padding-left: var(--space-3); padding-right: var(--space-3); }
.u-px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.u-px-5 { padding-left: var(--space-5); padding-right: var(--space-5); }
.u-px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }

.u-py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.u-py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }
.u-py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.u-py-5 { padding-top: var(--space-5); padding-bottom: var(--space-5); }
.u-py-6 { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.u-py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }

.u-pt-2 { padding-top: var(--space-2); }
.u-pt-3 { padding-top: var(--space-3); }
.u-pt-4 { padding-top: var(--space-4); }
.u-pt-6 { padding-top: var(--space-6); }
.u-pb-2 { padding-bottom: var(--space-2); }
.u-pb-3 { padding-bottom: var(--space-3); }
.u-pb-4 { padding-bottom: var(--space-4); }
.u-pb-6 { padding-bottom: var(--space-6); }

/* === Margin (negative for pull) =================================== */
.u-m-0 { margin: 0; }
.u-m-1 { margin: var(--space-1); }
.u-m-2 { margin: var(--space-2); }
.u-m-3 { margin: var(--space-3); }
.u-m-4 { margin: var(--space-4); }
.u-m-5 { margin: var(--space-5); }
.u-m-6 { margin: var(--space-6); }
.u-m-auto { margin: auto; }
.u-mx-auto { margin-left: auto; margin-right: auto; }
.u-mt-0 { margin-top: 0; }
.u-mt-1 { margin-top: var(--space-1); }
.u-mt-2 { margin-top: var(--space-2); }
.u-mt-3 { margin-top: var(--space-3); }
.u-mt-4 { margin-top: var(--space-4); }
.u-mt-6 { margin-top: var(--space-6); }
.u-mt-8 { margin-top: var(--space-8); }
.u-mb-0 { margin-bottom: 0; }
.u-mb-1 { margin-bottom: var(--space-1); }
.u-mb-2 { margin-bottom: var(--space-2); }
.u-mb-3 { margin-bottom: var(--space-3); }
.u-mb-4 { margin-bottom: var(--space-4); }
.u-mb-6 { margin-bottom: var(--space-6); }
.u-mb-8 { margin-bottom: var(--space-8); }
.u-ml-2 { margin-left: var(--space-2); }
.u-ml-3 { margin-left: var(--space-3); }
.u-ml-4 { margin-left: var(--space-4); }
.u-mr-2 { margin-right: var(--space-2); }
.u-mr-3 { margin-right: var(--space-3); }
.u-mr-4 { margin-right: var(--space-4); }

/* === Width / height =============================================== */
.u-w-full { width: 100%; }
.u-w-auto { width: auto; }
.u-w-fit { width: fit-content; }
.u-w-screen { width: 100vw; }
.u-min-w-0 { min-width: 0; }
.u-max-w-xs { max-width: 320px; }
.u-max-w-sm { max-width: 480px; }
.u-max-w-md { max-width: 640px; }
.u-max-w-lg { max-width: 800px; }
.u-max-w-xl { max-width: 1024px; }
.u-max-w-2xl { max-width: 1200px; }
.u-h-full { height: 100%; }
.u-h-screen { height: 100vh; }
.u-min-h-screen { min-height: 100vh; }

/* === Position ====================================================== */
.u-relative { position: relative; }
.u-absolute { position: absolute; }
.u-fixed { position: fixed; }
.u-sticky { position: sticky; }
.u-inset-0 { inset: 0; }
.u-top-0 { top: 0; }
.u-right-0 { right: 0; }
.u-bottom-0 { bottom: 0; }
.u-left-0 { left: 0; }

/* === Text alignment ================================================ */
.u-text-left { text-align: left; }
.u-text-center { text-align: center; }
.u-text-right { text-align: right; }

/* === Text transform / decoration =================================== */
.u-uppercase { text-transform: uppercase; }
.u-capitalize { text-transform: capitalize; }
.u-lowercase { text-transform: lowercase; }
.u-underline { text-decoration: underline; text-underline-offset: 2px; }
.u-no-decoration { text-decoration: none; }

/* === Font size ===================================================== */
.u-text-xs { font-size: var(--font-size-xs); }
.u-text-sm { font-size: var(--font-size-sm); }
.u-text-base { font-size: var(--font-size-base); }
.u-text-md { font-size: var(--font-size-md); }
.u-text-lg { font-size: var(--font-size-lg); }
.u-text-xl { font-size: var(--font-size-xl); }
.u-text-2xl { font-size: var(--font-size-2xl); }
.u-text-3xl { font-size: var(--font-size-3xl); }
.u-text-display { font-size: var(--font-size-display); }

/* === Font weight =================================================== */
.u-fw-regular { font-weight: var(--font-weight-regular); }
.u-fw-medium { font-weight: var(--font-weight-medium); }
.u-fw-semibold { font-weight: var(--font-weight-semibold); }
.u-fw-bold { font-weight: var(--font-weight-bold); }

/* === Line height =================================================== */
.u-leading-tight { line-height: var(--line-height-tight); }
.u-leading-snug { line-height: var(--line-height-snug); }
.u-leading-base { line-height: var(--line-height-base); }
.u-leading-relaxed { line-height: var(--line-height-relaxed); }

/* === Font family =================================================== */
.u-font-sans { font-family: var(--font-family-sans); }
.u-font-mono { font-family: var(--font-family-mono); }
.u-font-display { font-family: var(--font-family-display); }

/* === Letter spacing ================================================ */
.u-tracking-tight { letter-spacing: var(--letter-spacing-tight); }
.u-tracking-wide { letter-spacing: var(--letter-spacing-wide); }
.u-tracking-uppercase { letter-spacing: var(--letter-spacing-uppercase); }

/* === Text color ==================================================== */
.u-text-primary { color: var(--color-text-primary); }
.u-text-secondary { color: var(--color-text-secondary); }
.u-text-muted { color: var(--color-text-muted); }
.u-text-disabled { color: var(--color-text-disabled); }
.u-text-inverse { color: var(--color-text-inverse); }
.u-text-accent { color: var(--color-accent-primary); }
.u-text-success { color: var(--color-success); }
.u-text-warning { color: var(--color-warning); }
.u-text-danger { color: var(--color-danger); }
.u-text-info { color: var(--color-info); }

/* === Background color ============================================== */
.u-bg-canvas { background: var(--color-bg-canvas); }
.u-bg-elevated { background: var(--color-bg-elevated); }
.u-bg-raised { background: var(--color-bg-raised); }
.u-bg-subtle { background: var(--color-bg-subtle); }
.u-bg-hover { background: var(--color-bg-hover); }
.u-bg-active { background: var(--color-bg-active); }
.u-bg-accent { background: var(--color-accent-primary); color: var(--color-accent-on); }
.u-bg-accent-soft { background: var(--color-accent-soft); }
.u-bg-success { background: var(--color-success-bg); }
.u-bg-warning { background: var(--color-warning-bg); }
.u-bg-danger { background: var(--color-danger-bg); }
.u-bg-info { background: var(--color-info-bg); }
.u-bg-transparent { background: transparent; }

/* === Border ======================================================== */
.u-border { border: 1px solid var(--color-border-default); }
.u-border-subtle { border: 1px solid var(--color-border-subtle); }
.u-border-strong { border: 1px solid var(--color-border-strong); }
.u-border-t { border-top: 1px solid var(--color-border-subtle); }
.u-border-b { border-bottom: 1px solid var(--color-border-subtle); }
.u-border-l { border-left: 1px solid var(--color-border-subtle); }
.u-border-r { border-right: 1px solid var(--color-border-subtle); }
.u-border-0 { border: 0; }

/* === Radius ======================================================== */
.u-rounded-none { border-radius: 0; }
.u-rounded-sm { border-radius: var(--radius-sm); }
.u-rounded-md { border-radius: var(--radius-md); }
.u-rounded-lg { border-radius: var(--radius-lg); }
.u-rounded-xl { border-radius: var(--radius-xl); }
.u-rounded-2xl { border-radius: var(--radius-2xl); }
.u-rounded-full { border-radius: var(--radius-pill); }
.u-rounded-circle { border-radius: var(--radius-circle); }

/* === Shadow ======================================================== */
.u-shadow-xs { box-shadow: var(--shadow-xs); }
.u-shadow-sm { box-shadow: var(--shadow-sm); }
.u-shadow-md { box-shadow: var(--shadow-md); }
.u-shadow-lg { box-shadow: var(--shadow-lg); }
.u-shadow-xl { box-shadow: var(--shadow-xl); }
.u-shadow-none { box-shadow: none; }

/* === Effects ======================================================= */
.u-backdrop-blur { backdrop-filter: var(--backdrop-blur); -webkit-backdrop-filter: var(--backdrop-blur); }
.u-backdrop-blur-strong { backdrop-filter: var(--backdrop-blur-strong); -webkit-backdrop-filter: var(--backdrop-blur-strong); }
.u-opacity-0 { opacity: 0; }
.u-opacity-50 { opacity: 0.5; }
.u-opacity-100 { opacity: 1; }
.u-cursor-pointer { cursor: pointer; }
.u-cursor-not-allowed { cursor: not-allowed; }
.u-pointer-events-none { pointer-events: none; }
.u-overflow-hidden { overflow: hidden; }
.u-overflow-auto { overflow: auto; }
.u-overflow-scroll { overflow: scroll; }
.u-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.u-clamp-1 { display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
.u-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.u-clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.u-select-none { user-select: none; -webkit-user-select: none; }

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

/* === Animation ===================================================== */
.u-animate-fade-in { animation: fade-in var(--duration-base) var(--easing-standard); }
.u-animate-slide-up { animation: slide-up var(--duration-slow) var(--easing-emphasized); }
.u-animate-pulse { animation: pulse 2s var(--easing-standard) infinite; }
@keyframes fade-in { from { opacity: 0 } to { opacity: 1 } }
@keyframes slide-up { from { opacity: 0; transform: translateY(8px) } to { opacity: 1; transform: none } }
@keyframes pulse { 0%, 100% { opacity: 1 } 50% { opacity: 0.5 } }

/* === Responsive helpers ============================================ */
@media (max-width: 640px) {
  .u-mobile-hidden { display: none; }
  .u-mobile-flex-col { flex-direction: column; }
  .u-mobile-w-full { width: 100%; }
}
@media (min-width: 641px) {
  .u-desktop-hidden { display: none; }
}