/* PHI OS Design System — Foundation v1
   Intentionally low-specificity so legacy page CSS remains authoritative. */

:where(*, *::before, *::after) {
  box-sizing: border-box;
}

:where(html) {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

:where(body) {
  min-width: 320px;
  margin: 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

:where(img, svg, video, canvas) {
  display: block;
  max-width: 100%;
}

:where(button, input, textarea, select) {
  font: inherit;
}

:where(button, a) {
  -webkit-tap-highlight-color: transparent;
}

:where([hidden]) {
  display: none !important;
}

:where(:focus-visible) {
  outline: 2px solid var(--phi-action-primary);
  outline-offset: 4px;
}

.phi-sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.phi-skip-link {
  position: fixed;
  top: var(--phi-space-2);
  left: var(--phi-space-4);
  z-index: var(--phi-z-skip-link);
  padding: var(--phi-space-3) var(--phi-space-4);
  border-radius: var(--phi-radius-sm);
  background: var(--phi-text-primary);
  color: var(--phi-text-inverse);
  transform: translateY(calc(-100% - var(--phi-space-4)));
}

.phi-skip-link:focus-visible {
  transform: translateY(0);
}