body {
            margin: 0;
            overflow: hidden;
            background-color: #1a1a1a;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            display: flex;
        }
        #ui-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 350px;
            height: 100vh;
            background: rgba(10, 10, 10, 0.95);
            color: white;
            padding: 20px;
            box-sizing: border-box;
            z-index: 100;
            display: flex;
            flex-direction: column;
            border-right: 1px solid #333;
            overflow-y: auto;
        }
        h2 { margin-top: 0; font-size: 1.1rem; color: #fff; border-bottom: 1px solid #333; padding-bottom: 10px; }
        .section-label { font-size: 0.8rem; font-weight: bold; text-transform: uppercase; color: #888; margin: 15px 0 8px 0; }
        
        .control-group { margin-bottom: 15px; }

        .model-select {
            width: 100%;
            background: #222;
            color: white;
            border: 1px solid #444;
            padding: 8px;
            border-radius: 4px;
            font-size: 0.8rem;
            cursor: pointer;
        }

        #canvas-container { flex-grow: 1; height: 100vh; }