/* ========================================
   Accessibility
   無障礙、焦點樣式、動畫偏好
   ======================================== */

/* ─── 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 (WCAG 2.4.7) ─────────── */

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

button:focus:not(:focus-visible),
a:focus:not(:focus-visible),
input:focus:not(:focus-visible) {
  outline: none;
}

.theme-toggle:focus:not(:focus-visible) {
  box-shadow: var(--shadow-sm);
}

.theme-toggle:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(212, 165, 165, 0.3);
}

/* ─── Prefers Reduced Motion ──────────────── */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}