/* Reset dan dasar styling */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f7fa;
    color: #333;
    line-height: 1.6;
  }
  
  /* Header */
  header {
    background: linear-gradient(120deg, #3498db, #8e44ad);
    color: white;
    text-align: center;
    padding: 80px 0;
    border-bottom: 5px solid #f1f1f1;
  }
  
  header h1 {
    font-size: 3em;
    margin-bottom: 15px;
  }
  
  header p {
    font-size: 1.2em;
    margin-top: 10px;
    font-weight: 300;
  }
  
  /* Main Section */
  main {
    padding: 50px 20px;
  }
  
  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }
  
  h2.section-title {
    text-align: center;
    font-size: 2.5em;
    margin-bottom: 40px;
    color: #333;
  }
  
  /* File List */
  .file-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 40px;
    justify-items: center;
  }
  
  .file-item {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
    max-width: 380px;
    min-width: 300px;
  }
  
  .file-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  }
  
  .file-icon {
    font-size: 3em;
    color: #3498db;
    margin-bottom: 20px;
  }
  
  .file-item h3 {
    font-size: 1.6em;
    color: #333;
    margin-bottom: 15px;
  }
  
  .file-item p {
    font-size: 1em;
    color: #777;
    margin-bottom: 25px;
  }
  
  .btn-download {
    display: inline-block;
    background-color: #3498db;
    color: white;
    padding: 12px 25px;
    font-size: 1.1em;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease, transform 0.3s ease;
  }
  
  .btn-download:hover {
    background-color: #2980b9;
    transform: scale(1.05);
  }
  
  .btn-download i {
    margin-left: 10px;
  }
  
  /* Footer */
  footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px 0;
    margin-top: 50px;
  }
  
  footer p {
    font-size: 1em;
    margin-bottom: 15px;
  }
  
  footer .social-icon {
    color: white;
    margin: 0 15px;
    font-size: 1.5em;
  }
  
  footer .social-icon:hover {
    color: #3498db;
  }
  
  /* Responsiveness */
  @media (max-width: 768px) {
    header h1 {
      font-size: 2.5em;
    }
  
    .file-list {
      grid-template-columns: 1fr 1fr;
    }
  
    .file-item {
      padding: 20px;
    }
  }
  
  @media (max-width: 480px) {
    header h1 {
      font-size: 2em;
    }
  
    .file-list {
      grid-template-columns: 1fr;
    }
  
    .file-item {
      padding: 15px;
    }
  }