/* Base reset + utilità condivise (state layer, focus, reduced motion). */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100%;
  background: var(--bb-surface);
  color: var(--bb-on-surface);
  font-family: var(--bb-font-family);
  font-size: var(--bb-type-body-lg);
  line-height: var(--bb-leading-normal);
}

a {
  color: var(--bb-primary);
}

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

/* State layer M3: ::after con currentColor e opacità da ruoli --bb-state-*. */
.bb-interactive {
  position: relative;
  isolation: isolate;
}

.bb-interactive::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: currentColor;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--bb-motion-duration-short)
    var(--bb-motion-easing-standard);
}

.bb-interactive:hover::after {
  opacity: var(--bb-state-hover);
}

.bb-interactive:focus-visible::after {
  opacity: var(--bb-state-focus);
}

.bb-interactive:active::after {
  opacity: var(--bb-state-pressed);
}

.bb-interactive[disabled],
.bb-interactive[aria-disabled="true"] {
  opacity: var(--bb-state-disabled-content);
}

@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;
  }
}