* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
  color: #222;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background-color: white;
}

.menu {
  display: flex;
  gap: 20px;
}

.menu a {
  text-decoration: none;
  color: black;
}

.inicio {
  padding: 70px 40px;
  background-color: #e7ddff;
}

.contenedor {
  max-width: 900px;
  margin: auto;
  padding: 40px 20px;
}

.flex {
  display: flex;
  gap: 15px;
}

.caja {
  flex: 1;
  padding: 40px 20px;
  background-color: #ffd966;
  text-align: center;
}

.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

.tarjeta {
  padding: 20px;
  background-color: white;
  border: 1px solid #ccc;
}

button {
  padding: 10px 20px;
  border: none;
  background-color: black;
  color: white;
  cursor: pointer;
}

footer {
  padding: 20px;
  background-color: #222;
  color: white;
  text-align: center;
}

@media (max-width: 600px) {
  .header {
    flex-direction: column;
    gap: 15px;
  }

  .flex {
    flex-direction: column;
  }

  .grid {
    grid-template-columns: 1fr;
  }
}