body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: linear-gradient(135deg, #d1d1d1, #7a7a7a);
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 100vh;
      margin: 0;
      padding: 20px;
    }

    .header-container {
      margin: 20px 0;
      text-align: center;
    }

    @keyframes shine {
      0%, 100% {
        text-shadow:
          1px 1px 0 #4a4a4a,
          2px 2px 0 #3b3b3b,
          3px 3px 0 #2c2c2c,
          4px 4px 8px rgba(0, 0, 0, 0.6);
      }
      50% {
        text-shadow:
          1px 1px 0 #6f6f6f,
          2px 2px 0 #5a5a5a,
          3px 3px 0 #474747,
          4px 4px 12px rgba(0, 0, 0, 0.8);
      }
    }

    header {
            font-family: 'Poppins', sans-serif;
            font-weight: 600;
            font-size: 2.5rem;
            color: #e0e0e0;
            user-select: none;
            text-shadow:
                1px 1px 0 #4a4a4a,
                2px 2px 0 #3b3b3b,
                3px 3px 0 #2c2c2c,
                4px 4px 8px rgba(0, 0, 0, 0.6);
            animation: shine 3s ease-in-out infinite;
            transition: transform 0.3s ease, text-shadow 0.3s ease;
            cursor: default;
        }

        header:hover {
            transform: scale(1.05);
            text-shadow:
                2px 2px 2px #7a7a7a,
                4px 4px 8px #9e9e9e,
                6px 6px 15px rgba(0, 0, 0, 0.9);
        }

    .container {
      background: white;
      padding: 30px 20px;
      border-radius: 10px;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
      width: 100%;
      max-width: 700px;
    }

    .course-title {
      font-size: 1.6rem;
      font-weight: bold;
      text-align: center;
      color: #333;
      margin-bottom: 30px;
    }

    .course-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      margin-bottom: 20px;
      gap: 10px;
    }

    .section-label {
      font-weight: bold;
      font-size: 1.2rem;
      color: #333;
      min-width: 90px;
    }

    .button-group {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      flex: 1;
      justify-content: flex-start;
    }

    .custom-file-upload {
      display: inline-block;
      padding: 12px 20px;
      cursor: pointer;
      border-radius: 8px;
      background-color: #007bff;
      color: white;
      font-weight: 600;
      font-size: 16px;
      transition: background-color 0.3s ease;
      box-shadow: 0 4px 8px rgba(0, 123, 255, 0.3);
      user-select: none;
      min-width: 80px;
      text-align: center;
      text-decoration: none; /* Esto elimina el subrayado del enlace */
      border: none; 
    }

    .custom-file-upload:hover {
      background-color: #0056b3;
      box-shadow: 0 6px 12px rgba(0, 86, 179, 0.4);
    }

     footer {
      margin-top: 40px;
      text-align: center;
    }

    footer img {
      width: 120px;
      height: auto;
      margin-bottom: 10px;
    }

    .footer-text {
      font-family: 'Poppins', sans-serif;
      font-weight: 600;
      font-size: 1.3rem;
      color: #fcf9f9;
      text-shadow:
        1px 1px 0 #4a4a4a,
        2px 2px 0 #3b3b3b,
        3px 3px 0 #2c2c2c,
        4px 4px 8px rgba(0, 0, 0, 0.6);
    }

    @media (max-width: 600px) {
      header {
        font-size: 1.8rem;
      }

      .custom-file-upload {
        font-size: 14px;
        padding: 10px 15px;
        min-width: auto;
      }

      .container {
        padding: 20px 15px;
      }

      .course-row {
        flex-direction: column;
        align-items: flex-start;
      }

      .section-label {
        margin-bottom: 10px;
      }

      .button-group {
        justify-content: center;
      }
    }