body {
      margin: 0;
      font-family: Arial, sans-serif;
    }
    header {
      background: #111;
      color: white;
      text-align: center;
      padding: 15px;
      font-size: 24px;
      font-weight: bold;
    }
    .hero {
      position: relative;
      text-align: center;
    }
    .hero-text {
      position: absolute;
      top: 40%;
      left: 50%;
      transform: translate(-50%, -50%);
      color: yellow;
      font-size: 36px;
      font-weight: bold;
      text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
    }
    .features {
      display: flex;
      justify-content: center;
      gap: 20px;
      padding: 20px;
    }
    .card {
      background: white;
      border-radius: 6px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.2);
      padding: 15px;
      width: 250px;
    }
    .card h3 {
      margin-top: 0;
      font-size: 16px;
    }
    .promo {
      background: #28a745;
      color: white;
      text-align: center;
      padding: 20px;
      font-size: 20px;
      font-weight: bold;
    }
    .promo button {
      margin-top: 10px;
      padding: 10px 20px;
      border: none;
      border-radius: 4px;
      background: white;
      color: black;
      cursor: pointer;
      font-weight: bold;
    }
    .promo button:hover {
      background: #ddd;
    }