/* ============================================================================
   METRONIC SKELETON LOADING & ACCESIBILIDAD
   TerraVix - Estados de carga y foco
   ============================================================================ */

/* ------------------------------------------------------------------
   SKELETON LOADING - Shimmer effect Metronic
   ------------------------------------------------------------------ */

.tvx-skeleton {
  display: block;
  background: linear-gradient(
    90deg,
    var(--color-border) 0%,
    var(--color-hover) 50%,
    var(--color-border) 100%
  );
  background-size: 200% 100%;
  animation: tvx-skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

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

/* Skeleton variants */
.tvx-skeleton--text {
  height: 1em;
  margin-bottom: 0.5em;
  border-radius: var(--radius-sm);
}

.tvx-skeleton--heading {
  height: 2em;
  width: 60%;
  margin-bottom: 1em;
}

.tvx-skeleton--avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
}

.tvx-skeleton--card {
  height: 160px;
  border-radius: var(--radius-md);
}

.tvx-skeleton--button {
  height: 32px;
  width: 96px;
  border-radius: var(--radius-md);
}

/* Page skeleton - Loading inicial */
.tvx-page-skeleton {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.tvx-skeleton-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
}

.tvx-skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-6);
}

/* ------------------------------------------------------------------
   FOCUS RINGS - Accesibilidad AA con Verde TerraVix
   ------------------------------------------------------------------ */

*:focus {
  outline: none;
}

*:focus-visible {
  outline: 1.6px solid var(--focus-ring);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

/* Focus específico para botones */
button:focus-visible,
.tvx-create-btn:focus-visible,
.tvx-icon-btn:focus-visible {
  outline-color: var(--brand-600);
  outline-width: 1.6px;
  outline-offset: 1.6px;
}

/* Focus para inputs y selects */
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.rz-textbox:focus-visible,
.rz-dropdown:focus-visible {
  border-color: var(--brand-500);
  box-shadow: 0 0 0 2.4px var(--color-focus);
}

/* ------------------------------------------------------------------
   LOADING STATES - Spinners y overlays
   ------------------------------------------------------------------ */

.tvx-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 1.6px solid var(--color-border);
  border-top-color: var(--brand-500);
  border-radius: 50%;
  animation: tvx-spin 0.6s linear infinite;
}

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

.tvx-spinner--lg {
  width: 32px;
  height: 32px;
  border-width: 2.4px;
}

/* Loading overlay para cards */
.tvx-loading-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  backdrop-filter: blur(1.6px);
}

.tvx-loading-overlay__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.tvx-loading-overlay__text {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
}

/* ------------------------------------------------------------------
   MICRO-INTERACCIONES - Transitions Metronic (0.18s)
   ------------------------------------------------------------------ */

a,
button,
.tvx-nav-item,
.tvx-icon-btn,
.tvx-card {
  transition: background-color var(--transition-base),
              color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-base);
}

/* Hover subtle para elementos interactivos */
.tvx-interactive {
  transition: all var(--transition-base);
}

.tvx-interactive:hover {
  transform: translateY(-1px);
}

.tvx-interactive:active {
  transform: translateY(0);
}

/* ------------------------------------------------------------------
   OVERLAY & BACKDROP - Sidebar mobile
   ------------------------------------------------------------------ */

.tvx-overlay {
  display: none;  /* Oculto por defecto */
}

@media (max-width: 767px) {
  .tvx-overlay {
    display: none;
  }
  
  .tvx-overlay.active {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 850;
    backdrop-filter: blur(3.2px);
    animation: tvx-fade-in 0.2s ease;
  }
}

@keyframes tvx-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ------------------------------------------------------------------
   SCREEN READER ONLY - Contenido para lectores de pantalla
   ------------------------------------------------------------------ */

.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-width: 0;
}

.u-sr-only-focusable:focus {
  position: static;
  width: auto;
  height: auto;
  padding: inherit;
  margin: inherit;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/* ------------------------------------------------------------------
   REDUCED MOTION - Respeto a preferencias de usuario
   ------------------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .tvx-skeleton {
    animation: none;
    background: var(--color-border);
  }
}

/* ------------------------------------------------------------------
   TOOLTIPS - Para sidebar colapsado con iconos
   ------------------------------------------------------------------ */

.tvx-tooltip {
  position: absolute;
  left: calc(100% + var(--space-2));
  top: 50%;
  transform: translateY(-50%);
  padding: var(--space-2) var(--space-3);
  background: var(--color-text);
  color: var(--color-surface);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  white-space: nowrap;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-tooltip);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.tvx-sidebar.collapsed .tvx-nav-item:hover .tvx-tooltip {
  opacity: 1;
  visibility: visible;
}

/* Arrow tooltip */
.tvx-tooltip::before {
  content: '';
  position: absolute;
  right: 100%;
  top: 50%;
  transform: translateY(-50%);
  border: 4px solid transparent;
  border-right-color: var(--color-text);
}

/* ------------------------------------------------------------------
   EMPTY STATES - Cuando no hay contenido
   ------------------------------------------------------------------ */

.tvx-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-12);
  text-align: center;
  color: var(--color-text-muted);
}

.tvx-empty-state__icon {
  width: 51.2px;
  height: 51.2px;
  color: var(--color-border-strong);
  margin-bottom: var(--space-4);
}

.tvx-empty-state__title {
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.tvx-empty-state__description {
  font-size: var(--fs-md);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  max-width: 320px;
}

.tvx-empty-state__action {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}