body {
      font-family: Arial, sans-serif;
      margin: 0;
      background: linear-gradient(135deg, #8e2de2, #4a00e0);
      display: flex;
      justify-content: center;
    }
    .container {
      max-width: 750px;
      width: 100%;
      background: #fff;
      min-height: 100vh;
      box-shadow: 0 0 20px rgba(0,0,0,0.3);
      border-radius: 12px;
      overflow: hidden;
    }

    /* HEADER */
    .header { position: relative; }
    .header img { width: 100%; height: auto; object-fit: cover; }
    .download-btn {
      position: absolute;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      padding: 16px 30px;
      background: linear-gradient(90deg, #43cea2, #185a9d);
      color: white;
      font-size: 20px;
      font-weight: bold;
      border: none;
      border-radius: 40px;
      cursor: pointer;
      box-shadow: 0 6px 14px rgba(0,0,0,0.4);
      text-decoration: none;
      display: inline-block;
    }
    .download-btn:hover { transform: translateX(-50%) scale(1.08); }

    /* CATEGORY BUTTONS */
    .category-buttons { 
      display: flex; 
      justify-content: space-around; 
      flex-wrap: wrap;
      margin: 20px 10px;
      gap: 10px;
    }
    .category-buttons button {
      flex: 1 1 30%;
      min-width: 100px;
      padding: 12px 15px;
      border: none;
      cursor: pointer;
      background: linear-gradient(90deg, #6a11cb, #2575fc);
      color: white;
      border-radius: 25px;
      font-size: 16px;
      transition: background 0.3s, transform 0.2s;
    }
    .category-buttons button:hover {
      background: linear-gradient(90deg, #00c6ff, #0072ff);
      transform: scale(1.05);
    }

    /* APP LIST */
    .app-list { max-width: 700px; margin: auto; padding: 0 10px; display: none; }
    .app-list.active { display: block; animation: fadeIn 0.4s ease-in-out; }
    @keyframes fadeIn { from {opacity:0; transform: translateY(10px);} to {opacity:1; transform: translateY(0);} }

    /* APP CARD */
    .app-card {
      display: flex; justify-content: space-between; align-items: center;
      background: #fdfcff;
      padding: 15px;
      margin: 12px 0;
      border-radius: 12px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      flex-wrap: wrap;
      gap: 10px;
    }
    .app-info { display: flex; align-items: center; flex: 1 1 auto; }
    .app-info img { width: 70px; height: 70px; border-radius: 12px; margin-right: 15px; border: 2px solid #ddd; }
    .app-details p { margin: 4px 0; font-size: 14px; }
    .stars { color: #fbc02d; font-size: 16px; }

    /* DOWNLOAD BUTTON IN CARD */
    .download-app-btn {
      background: linear-gradient(90deg, #00b09b, #96c93d);
      color: white;
      border: none;
      padding: 10px 20px;
      border-radius: 25px;
      cursor: pointer;
      font-size: 14px;
      transition: transform 0.2s, background 0.3s;
      text-decoration: none;
      display: inline-block;
      white-space: nowrap;
    }
    .download-app-btn:hover {
      background: linear-gradient(90deg, #f7971e, #ffd200);
      transform: scale(1.1);
    }

    /* FOOTER */
    footer {
      text-align: center;
      padding: 15px;
      background: linear-gradient(135deg, #283c86, #45a247);
      color: white;
      margin-top: 20px;
      font-size: 14px;
    }

    /* RESPONSIVE DESIGN */
    @media (max-width: 768px) {
      .download-btn {
        font-size: 16px;
        padding: 14px 20px;
      }
      .app-info img { width: 60px; height: 60px; }
      .app-details p { font-size: 13px; }
      .download-app-btn { font-size: 13px; padding: 8px 15px; }
    }

    @media (max-width: 480px) {
      .category-buttons button {
        flex: 1 1 100%;
      }
      .header img {
        height: auto;
      }
      .download-btn {
        font-size: 14px;
        padding: 12px 18px;
      }
      .download-app-btn {
        width: 100%;
        text-align: center;
      }
    }