body {
      font-family: 'Segoe UI', sans-serif;
      margin: 0;
      padding: 0;
      background: #f4f4f4;
    }

 header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1rem 2rem;
      background-color: #1C396B;
      color: #fff;
      position: relative;
      /*background-color: #1C396B;
      color: white;
      padding: 20px;
      text-align: center; */
    }

    h1 {
      text-align: center;
      padding: 20px;
      background: #1C396B;
      color: #fff;
      margin-bottom: 20px;
    }

    .pdf-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
      padding: 20px;
      max-width: 1200px;
      margin: auto;
    }

    .pdf-card {
      background: white;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.1);
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .pdf-canvas {
      width: 100%;
      border: 1px solid #ccc;
    }

    .pdf-controls {
      margin-top: 10px;
      display: flex;
      gap: 10px;
    }

    button {
      padding: 8px 14px;
      background: #007bff;
      color: white;
      border: none;
      border-radius: 4px;
      cursor: pointer;
      font-size: 14px;
    }

    button:hover {
      background: #0056b3;
    }

    .filename {
      margin-top: 10px;
      font-size: 14px;
      color: #333;
    }
    .logo, .volver {
      width: 25%;
    }

    .logo a, .volver a {
      color: #fff;
      text-decoration: none;
      font-weight: bold;
    }
    .logo a:hover, .volver a:hover {
      text-decoration: underline;
    }