.gallery-thumb {
      cursor: pointer;
      border-radius: 0px;
      transition: transform 0.2s;
    }
    .gallery-thumb:hover {
      transform: scale(1.05);
    }
    .thumb-wrap { padding:6px; }

      #goTopBtn {
    display: none; /* ซ่อนตอนเริ่ม */
    position: fixed;
    bottom: 10px;
    right: 10px;
    z-index: 99;
    background-color: #603916;
    color: white;
    padding: 10px 12px;
    border-radius: 50%;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    transition: background-color 0.3s;
  }
  #goTopBtn:hover {
    background-color: #ffcc00;
    text-decoration: none;
  }