body { margin: 0; overflow: hidden; background-color: #000; }
        #canvas-container { width: 100vw; height: 100vh; }
        
        .lil-gui.root {
            position: absolute !important;
            top: auto !important;
            bottom: 20px !important;
            right: 20px !important;
        }

        #overlay {
            position: absolute;
            top: 0; left: 0; width: 100%; height: 100%;
            background: rgba(0,0,0,0.8);
            display: flex;
            justify-content: center;
            align-items: center;
            color: white;
            font-family: monospace;
            font-size: 24px;
            cursor: pointer;
            z-index: 1000;
            flex-direction: column;
            text-align: center;
        }
        #overlay span {
            font-size: 14px;
            color: #888;
            margin-top: 15px;
        }
        .highlight { color: #ffaa00; font-weight: bold; }