/**
 * Accessibility & Interaction Foundations (Web Interface Guidelines)
 */

/* Skip Link */
.skip-link {
  position: absolute;
  top: -120px;
  left: 1rem;
  z-index: 1000;
  padding: 0.65rem 1.25rem;
  background-color: var(--accent);
  color: var(--text-inverse);
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  box-shadow: var(--shadow-md);
  transition: top var(--dur-fast) var(--ease);
}

.skip-link:focus {
  top: 1rem;
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* 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: 0;
}

/* Focus Visible (Never outline: none without focus-visible) */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button, a, input, select {
  touch-action: manipulation;
}

/* Tabular Numbers for Data & Timers */
.tabular-nums {
  font-variant-numeric: tabular-nums;
}

/* Heading Balance */
h1, h2, h3 {
  text-wrap: balance;
}

/* 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;
  }
}