/* -------------------------------------------------------------------------- */
/*                                 Shell (Overlay)                           */
/* -------------------------------------------------------------------------- */

.bn-ms-shell {
  position: fixed;
  inset: 0;
  z-index: var(--bn-ms-z-max);
  pointer-events: none;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0;
}

.bn-ms-shell__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  opacity: 0;
  transition: opacity var(--bn-ms-transition-base);
  pointer-events: none;
}

.bn-ms-shell__viewport {
  position: relative;
  width: 100%;
  height: 100%;
  background: var(--bn-ms-color-surface);
  box-shadow: var(--bn-ms-shadow-lg);
  border-radius: var(--bn-ms-radius-sm);
  transform: translateY(100%);
  opacity: 0;
  transition: transform var(--bn-ms-transition-base), 
              opacity var(--bn-ms-transition-base);
  display: flex;
  flex-direction: column;
  pointer-events: auto;
  overflow: hidden;
}

/* --- Open State --- */
.bn-ms-shell[aria-hidden="false"] {
  pointer-events: auto;
}

.bn-ms-shell[aria-hidden="false"] .bn-ms-shell__backdrop {
  opacity: 1;
  pointer-events: auto;
}

.bn-ms-shell[aria-hidden="false"] .bn-ms-shell__viewport {
  transform: translateY(0);
  opacity: 1;
}

/* --- Desktop: Bottom-right window --- */
@media (min-width: 768px) {
  .bn-ms-shell {
    justify-content: flex-end;
    align-items: flex-end;
    padding: var(--bn-ms-spacing-md);
    padding-bottom: calc(var(--bn-ms-spacing-md) + var(--bn-ms-safe-bottom, 0px));
  }

  .bn-ms-shell__backdrop {
    display: none; /* No backdrop on desktop */
  }

  .bn-ms-shell__viewport {
    width: min(920px, calc(100vw - 32px));
    height: calc(100vh - 32px);
    max-height: calc(100vh - 32px);
    border-radius: var(--bn-ms-radius-xl);
    box-shadow: var(--bn-ms-shadow-lg), 0 0 0 1px var(--bn-ms-color-border-strong);
    transform: translateY(20px) scale(0.95);
  }

  .bn-ms-shell[aria-hidden="false"] .bn-ms-shell__viewport {
    transform: translateY(0) scale(1);
  }
}