/* ?? reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
}

/* fondo general */
body {
  background: #f5f5f5;
}

/* contenedor central */
.container {
  max-width: 400px;
  margin: auto;
  padding: 20px;
}

/* título */
h1 {
  text-align: center;
  margin-bottom: 40px;
}

/* tarjetas (botones grandes) */
.card {
  display: block;
  padding: 15px;
  margin-bottom: 10px;
  background: white;
  border-radius: 10px;
  text-decoration: none;
  color: black;

  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  transition: 0.2s;
}

/* efecto */
.card:hover {
  transform: scale(1.03);
}

/* botón volver */
.back {
  display: block;
  margin-top: 20px;
  text-align: center;
  color: #555;
}