/* Estilos globales */
body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f8ff;
    color: #333;
  }
  
  /* Header */
  header {
    background-color: #0066cc;
    color: white;
    text-align: center;
    padding: 30px 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
  }
  
  /* Navegación */
  nav {
    background-color: #004d99;
  }
  
  nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    justify-content: center;
  }
  
  nav li {
    margin: 0 15px;
  }
  
  nav a {
    display: inline-block;
    padding: 15px 10px;
    color: white;
    text-decoration: none;
    transition: background-color 0.3s;
  }
  
  nav a:hover {
    background-color: #003366;
  }
  
  /* Main Layout */
  main {
    display: flex;
    flex-wrap: wrap;
    padding: 20px;
  }
  
  /* Section principal */
  section {
    flex: 3;
    padding: 20px;
    background-color: #ffffff;
    margin-right: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  }
  
  /* Aside */
  aside {
    flex: 1;
    background-color: #e6f2ff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  }
  
  /* Footer */
  footer {
    background-color: #0066cc;
    color: white;
    text-align: center;
    padding: 15px;
    margin-top: 20px;
  }