body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: #ffe6f0; /* Fondo rosa claro */
  font-family: Arial, sans-serif;
}

.calculadora {
  background: #fff0f6; /* Fondo más suave */
  padding: 20px;
  border-radius: 15px;
  box-shadow: 0px 4px 12px rgba(0,0,0,0.2);
  width: 260px;
}

#pantalla {
  width: 100%;
  height: 45px;
  margin-bottom: 12px;
  font-size: 20px;
  text-align: right;
  padding: 8px;
  border: 2px solid #ff99cc;
  border-radius: 8px;
  background: #fff;
}

.botones {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

button {
  padding: 15px;
  font-size: 18px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: #ffb6c1; /* rosa pastel */
  color: #fff;
  transition: background 0.3s ease;
}

button:hover {
  background: #ff99cc; /* rosa un poco más fuerte */
}

.igual {
  grid-row: span 2;
  background: #ff4da6; /* rosa intenso */
  color: white;
}

.cero {
  grid-column: span 2;
}