/* ==============================================
   utilities.css - Utility Classes, Responsive, Loading Spinner
   ============================================== */

/* Utility Classes */
.hidden {
  display: none !important;
}

.text-muted {
  color: var(--muted) !important;
}

/* Loading Spinner */
.spinner-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.spinner-overlay .spinner-border {
  width: 3rem;
  height: 3rem;
}

/* Responsive */
@media (max-width: 768px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
  }

  .hero {
    flex-direction: column;
    text-align: center;
  }
}