@media (max-width: 640px) {
  .app {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    padding: 10px 12px 10px;
    gap: 0;
  }

  .sidebar-icons {
    margin-bottom: 8px;
  }

  .stats-block {
    padding: 7px 10px 8px;
    margin-bottom: 8px;
  }

  .stat-value {
    font-size: 1rem;
  }

  .category-section {
    flex: unset;
    margin-bottom: 8px;
  }

  .sidebar-label {
    display: none;
  }

  .category-list {
    display: block;
  }

  .sidebar-actions {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }

  .shuffle-btn {
    flex: 1;
    min-width: 90px;
    padding: 8px 10px;
    font-size: 0.8rem;
  }

  .action-btn {
    flex: 1;
    min-width: 120px;
    padding: 7px 8px;
    font-size: 0.74rem;
  }

  .main {
    padding: 16px 10px 20px;
  }

  .game-title {
    font-size: 1.25rem;
  }

  .tile {
    font-size: 0.7rem;
    min-height: 52px;
    padding: 8px 4px;
  }

  .grid {
    gap: 6px;
  }

  .btn {
    padding: 9px 16px;
    font-size: 0.82rem;
  }
}