.seat-map{
  display:grid;
  grid-template-columns: 1fr 0.6fr 1fr; /* links – gang – rechts */
  gap:10px;
  margin-top:15px;
  align-items:stretch;
}

.aisle{
  border-radius:6px;
  background: transparent;  /* bleibt leer */
}

.seat{
  padding:12px;
  border-radius:6px;
  border:2px solid #ccc;
  text-align:center;
  cursor:pointer;
  user-select:none;
}

.seat.selected{
  background:#0d6efd;
  color:white;
  border-color:#0d6efd;
}

.seat.unavailable{
  opacity:.5;
  cursor:not-allowed;
}