body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: linear-gradient(135deg, #007bff 50%, #409eff 50%);
      color: #ffffff;
      min-height: 100vh;
      display: flex;
      flex-direction: column;   
      align-items: center;
      padding: 50px 20px;
      margin: 0;
    }
    h1 {
      font-size: 2.8rem;
      margin-bottom: 40px;
      color: #00ffcc;
      text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.5);
    }
    .file {
      background: rgba(255, 255, 255, 0.1);
      padding: 30px;
      border-radius: 15px;
      margin: 20px;
      width: 300px;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
      transition: transform 0.3s ease;
    }
    .file:hover {
      transform: translateY(-8px);
    }
    .file-title {
      font-size: 1.8rem;
      margin-bottom: 20px;
    }
    .download-btn {
      text-decoration: none;
      background: #00ffcc;
      color: #000;
      padding: 12px 25px;
      border-radius: 10px;
      font-weight: bold;
      transition: background-color 0.3s, transform 0.3s;
      display: inline-block;
    }
    .download-btn:hover {
      background: #00ddb5;
      transform: scale(1.05);
    }
    .back-btn {
      margin-top: 50px;
      text-decoration: none;
      background: #ffffff;
      color: #007bff;
      padding: 10px 20px;
      border-radius: 8px;
      font-weight: bold;
      box-shadow: 0 5px 15px rgba(0,0,0,0.2);
      transition: background-color 0.3s, color 0.3s;
    }
    .back-btn:hover {
      background: #00ffcc;
      color: #000;
    }