body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    background: linear-gradient(180deg, #0a0a0a, #0f3057);
    color: #fff;
  }
  
  header {
    background: #000;
    padding: 20px;
    text-align: center;
    border-bottom: 2px solid #0f3057;
  }
  
  header h1 {
    color: #00aaff;
  }
  
  nav ul {
    list-style: none;
    padding: 0;
  }
  
  nav ul li {
    display: inline-block;
    margin: 0 15px;
  }
  
  nav ul li a, nav.voltar a {
    color: #00aaff;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s, transform 0.3s;
  }
  
  nav ul li a:hover, nav.voltar a:hover {
    color: #fff;
    transform: scale(1.1);
  }
  
  main {
    text-align: center;
    padding: 40px;
  }
  
  .cards {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 50px;
  }
  
  .card {
    background: #111;
    border: 2px solid #00aaff;
    border-radius: 10px;
    margin: 15px;
    padding: 20px;
    width: 200px;
    text-align: center;
    transition: transform 0.3s, background 0.3s;
  }
  
  .card a {
    color: #00aaff;
    text-decoration: none;
    font-weight: bold;
  }
  
  .card:hover {
    transform: translateY(-10px);
    background: #0f3057;
  }