/* ============================================
   NOVA Accessibility Layer
   
   Global a11y styles:
   - Focus-visible outlines
   - Reduced motion support
   - Screen reader utilities
   - Keyboard navigation
   - High contrast mode
   ============================================ */

/* ── Focus Visible ── */
:focus-visible {
  outline: 2px solid var(--nova-accent-indigo, #6366f1);
  outline-offset: 2px;
  border-radius: 4px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* ── Smooth Scroll ── */
html {
  scroll-behavior: smooth;
}

/* ── Skip to content ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 10000;
  padding: 12px 24px;
  background: var(--nova-accent-indigo, #6366f1);
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  border-radius: 0 0 8px 8px;
  text-decoration: none;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 0;
}

/* ── Reduced Motion ── */
@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;
  }
  .orb-core, .orb-glow, .orb-ring,
  .particle, .nova-container,
  .chat-area, .menu-list {
    animation: none !important;
  }
}

/* ── Screen Reader Only ── */
.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;
}

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

/* ── Global Button Focus ── */
button:focus-visible,
a.btn:focus-visible,
[role="button"]:focus-visible {
  outline: 2px solid var(--nova-accent-indigo, #6366f1);
  outline-offset: 2px;
}

/* ── High Contrast Mode ── */
@media (forced-colors: active) {
  .sidebar__item--active {
    border: 2px solid LinkText;
  }
  .btn--primary {
    border: 2px solid ButtonText;
  }
  .review-card, .agent-card, .settings-card {
    border: 1px solid CanvasText;
  }
}

/* ── Keyboard Navigation Helpers ── */
.keyboard-nav .sidebar__item:focus-visible,
.keyboard-nav .btn:focus-visible,
.keyboard-nav .settings-btn:focus-visible {
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.5);
}

/* ── Interactive element minimum touch target ── */
@media (pointer: coarse) {
  .sidebar__item,
  .btn,
  .settings-btn,
  .graph-filter-item,
  .detail-connection,
  .search-result-item {
    min-height: 44px;
    min-width: 44px;
  }
}

/* ── ARIA live region for dynamic content ── */
[aria-live] {
  position: relative;
}

/* ── Focus trap helper for modals ── */
.modal-overlay:focus-within {
  z-index: 9999;
}

/* ── Color contrast helpers ── */
.text-muted { color: var(--nova-text-muted, #64748b); }
.text-high-contrast { color: var(--nova-text-primary, #f1f5f9); }

/* ── Reduced data preference ── */
@media (prefers-reduced-data: reduce) {
  .particle, .orb-core, .orb-glow, .orb-ring {
    display: none !important;
  }
}