body {
  font-family: Arial, sans-serif;
  background: #f2f2f2;
  margin: 0;
  padding: 0;
}

header {
  background-color: #283593;
  color: white;
  padding: 15px 20px;
}

header h1 {
  margin: 0;
  font-size: 24px;
}

nav {
  margin-top: 10px;
}

nav a {
  color: white;
  margin-right: 15px;
  text-decoration: none;
  font-weight: bold;
}

nav a:hover {
  text-decoration: underline;
}

main {
  padding: 20px;
}

button {
  padding: 10px 15px;
  margin: 5px;
  background-color: #1976d2;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #1565c0;
}

.nodo {
  padding: 10px;
  margin: 5px;
  background-color: #e3f2fd;
  border: 1px solid #90caf9;
  border-radius: 4px;
  text-align: center;
}

.ciclo-box {
  margin-top: 30px;
  border: 2px solid #ccc;
  border-radius: 8px;
  padding: 15px;
  background: white;
}

.ciclo-central {
  text-align: center;
  margin-bottom: 15px;
}

.ciclo-niveles {
  display: flex;
  justify-content: space-around;
}

.patrocinador {
  background-color: #c5e1a5;
  font-weight: bold;
}

input, select {
  display: block;
  margin: 10px 0;
  padding: 8px;
  width: 100%;
  max-width: 400px;
}

form {
  max-width: 500px;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

h2 {
  margin-top: 0;
}

.acordeon-nivel {
  border: 1px solid #ccc;
  margin-bottom: 10px;
  border-radius: 6px;
  overflow: hidden;
}

.acordeon-titulo {
  background-color: #f2f2f2;
  padding: 10px;
  margin: 0;
  cursor: pointer;
  font-weight: bold;
}

.acordeon-contenido {
  display: none;
  padding: 10px;
  background-color: #fff;
}

.acordeon-contenido.visible {
  display: block;
}