body {
      font-family: Arial, sans-serif;
      background: #f4f4f4;
      margin: 0;
      padding: 20px;
    }

    h1 {
      text-align: center;
      color: #333;
      margin-bottom: 30px;
    }

    /* Gallery Grid */
    .gallery {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 15px;
    }

    .gallery img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 10px;
      cursor: pointer;
      transition: transform 0.3s, box-shadow 0.3s;
    }

    .gallery img:hover {
      transform: scale(1.05);
      box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    }

    /* Lightbox Overlay */
    .lightbox {
      display: none;
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0,0,0,0.8);
      justify-content: center;
      align-items: center;
      z-index: 999;
      flex-direction: column;
    }

    /* Zoomed Image */
    .lightbox img {
      max-width: 80%;
      max-height: 80%;
      border-radius: 10px;
      box-shadow: 0 0 25px rgba(255,255,255,0.2);
      transition: transform 0.4s ease;
      transform: scale(1);
      animation: zoomIn 0.4s ease;
      position: absolute;
      top: 50%;
      left: 50%; /* For horizontal centering */
      transform: translate(-50%, -50%);
    }

    @keyframes zoomIn {
      from { transform: scale(0.8); opacity: 0; }
      to { transform: scale(1); opacity: 1; }
    }

    /* Navigation Buttons */
    .nav-btn {
      position: absolute;
      top: 50%;
      font-size: 3rem;
      color: white;
      cursor: pointer;
      user-select: none;
      transform: translateY(-50%);
      transition: color 0.3s;
    }

    .nav-btn:hover {
      color: #ff4c4c;
    }

    .prev-btn { left: 40px; }
    .next-btn { right: 40px; }

    /* Close Button */
    .close-btn {
      position: absolute;
      top: 20px;
      right: 30px;
      font-size: 2rem;
      color: white;
      cursor: pointer;
      transition: color 0.3s;
    }

    .close-btn:hover {
      color: #ff4c4c;
    }