* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: Arial, sans-serif;
      background-color: #f0f0f0;
      padding: 20px;
    }

    .containernews {
      max-width: 1300px;
      margin: auto;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .top-banner {
      background: #fff;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 0 8px rgba(0,0,0,0.1);
    }

    .top-banner img {
      width: 100%;
      height: auto;
      display: block;
    }

    .top-banner h2 {
      padding: 15px;
      font-size: 20px;
    }

    .row {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .card {
      background: #fff;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 0 6px rgba(0,0,0,0.1);
      display: flex;
      flex-direction: column;
      flex: 1;
      min-width: 280px;
    }

    .card img {
      width: 100%;
      height: auto;
    }

    .card h3 {
      padding: 15px;
      font-size: 16px;
    }

    /* Distribucion especial de las tarjetas */
    .row.row-2 .card {
      flex: 1 1 calc(50% - 10px);
    }

    .row.row-3 .card {
      flex: 1 1 calc(33.33% - 13.33px);
    }

    @media (max-width: 768px) {
      .row.row-2 .card,
      .row.row-3 .card {
        flex: 1 1 100%;
      }
    }