.btn-toggle-group .btn {
      border-radius: 50px !important; /* pill style */
      font-weight: 600;
      min-width: 110px;
      transition: all 0.3s ease;
    }
    .btn-toggle-group .btn-check:checked + .btn {
      box-shadow: 0 0 12px rgba(0,0,0,0.2);
      transform: scale(1.05);
    }