body {
  font-family: "Segoe UI", sans-serif;
  margin: 0;
  background: #f1f8f9;
  color: #333;
}
header {
  background-color: #0077b6;
  color: white;
  text-align: center;
  padding: 1.5em 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}
h1 {
  margin: 0;
}
main {
  max-width: 900px;
  margin: 20px auto;
  background: white;
  padding: 20px 30px;
  border-radius: 15px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
section {
  margin-bottom: 30px;
}
h2 {
  color: #0077b6;
  border-bottom: 2px solid #0077b6;
  padding-bottom: 5px;
}
.valor {
  background: #caf0f8;
  margin: 10px 0;
  padding: 10px;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.3s;
}
.valor:hover {
  background: #ade8f4;
}
.descripcion {
  display: none;
  padding: 10px;
  background: #eafcff;
  border-left: 4px solid #0096c7;
  border-radius: 5px;
  margin-top: 5px;
}
footer {
  text-align: center;
  background: #0077b6;
  color: white;
  padding: 10px;
  margin-top: 40px;
  font-size: 0.9em;
  border-top-left-radius: 15px;
  border-top-right-radius: 15px;
}