.grid {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  gap: 5px;
  padding: 10px;
}

.cell {
  border: 1px solid #ccc;
  padding: 5px;
  font-size: 12px;
  text-align: center;
  cursor: pointer;
  border-radius: 5px;
  transition: background 0.3s;
}

.cell:hover {
  background: #eee;
}

.cursada {
  background-color: #b0f2b4;
}

.requiere {
  border: 2px dashed #f00;
}