body { margin:0; padding:0; overflow:hidden; font-family:Arial; }
        .model-container { position:relative; width:100vw; height:100vh; }
        model-viewer { width:100%; height:100%; }
        .controls { position:absolute; top:15px; right:15px; display:flex; flex-direction:column; gap:8px; z-index:100; }
        .control-btn { background:white; border:1px solid #ccc; border-radius:3px; padding:6px 12px; font-size:12px; cursor:pointer; color:#333; min-width:40px; }
        .control-btn:hover { background:#f5f5f5; }
        .control-btn.active { background:#e8f4ff; border-color:#2196F3; color:#2196F3; }
        .fullscreen-btn { font-weight:bold; }