* {
      box-sizing: border-box;
    }
    
    body {
      font-family: 'Segoe UI', sans-serif;
      margin: 0;
      padding: 20px;
      background-color: #f0f2f5;
      color: #333;
    }
    
    h1 {
      text-align: center;
      margin-bottom: 30px;
    }
    
    #data-container {
      display: grid;
      grid-template-columns: 1fr;
      gap: 20px;
      max-width: 800px;
      margin: 0 auto;
    }
    
    .card {
      background-color: white;
      border-radius: 12px;
      padding: 20px;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
      transition: transform 0.2s;
    }
    
    .card:hover {
      transform: translateY(-4px);
    }
    
    .title {
      font-size: 18px;
      font-weight: bold;
      margin-bottom: 10px;
      color: #1a73e8;
    }
    
    .date {
      font-size: 14px;
      color: #777;
      margin-bottom: 10px;
    }
    
    .btn {
      display: inline-block;
      padding: 8px 16px;
      background-color: #1a73e8;
      color: white;
      border: none;
      border-radius: 8px;
      text-decoration: none;
      cursor: pointer;
      font-size: 14px;
    }
    
    #single-post {
      display: none;
      max-width: 800px;
      margin: 0 auto;
      background-color: white;
      border-radius: 12px;
      padding: 20px;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    }
    
    #single-post h2 {
      color: #1a73e8;
    }
    
    @media (min-width: 600px) {
      #data-container {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (min-width: 900px) {
      #data-container {
        grid-template-columns: repeat(3, 1fr);
      }
    }