body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f4f4f4;
  color: #222;
}

header {
  background: #1e3a5f;
  color: white;
  padding: 1rem 2rem;
}

nav a {
  color: white;
  margin-right: 1.5rem;
  text-decoration: none;
}

main {
  padding: 2rem;
  /* BUG 8: ancho fijo en px en vez de max-width relativo,
     provoca overflow horizontal en pantallas angostas (celular) */
  width: 1200px;
}

.producto {
  background: white;
  border: 1px solid #ddd;
  padding: 1rem;
  margin-bottom: 1rem;
  border-radius: 6px;
}

button {
  background: #1e3a5f;
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
}

footer {
  text-align: center;
  padding: 1rem;
  color: #777;
}