.container_dt {
            max-width: 1600px;
            margin-top: -15px;
            background: rgba(255, 255, 255, 0.95);
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            height: 95vh;
        }
        
        header_dt {
            background: rgba(15, 25, 45, 0.95);
            padding: 15px 20px;
            text-align: center;
            border-bottom: 2px solid #3498db;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .header-content_dt {
            flex: 1;
        }
        
        h1_dt {
            font-size: 1.8rem;
            margin-bottom: 5px;
            background: linear-gradient(90deg, #3498db, #2ecc71);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        
        .subtitle_dt {
            color: #ecf0f1;
            font-size: 0.9rem;
            max-width: 800px;
            margin: 0 auto;
        }
        
        .main-content_dt {
            display: flex;
            flex: 1;
            overflow: hidden;
        }
        
        #controls_dt {
            width: 430px;
            background: rgba(245, 245, 245, 0.95);
            padding: 15px;
            overflow-y: auto;
            border-right: 1px solid #e0e0e0;
            transition: width 0.3s;
        }
        
        .toolbox-section_dt {
            margin-bottom: 1px;
            padding: 8px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }
        
        .toolbox-title_dt {
            font-size: 1.8rem;
            color: #3498db;
            margin-bottom: 5px;
            padding-bottom: 4px;
            border-bottom: 2px solid #3498db;
            display: flex;
            align-items: center;
        }
        .function-input {
            font-size: 1.8rem;
            color: #3498db;
            margin-bottom: 5px;
            padding-bottom: 4px;
            border-bottom: 2px solid #3498db;
            display: flex;
            align-items: center;
        }        
        .toolbox-title_dt i {
            margin-right: 4px;
            font-size: 1.1rem;
        }
        
        #canvas-container_dt {
            flex: 1;
            position: relative;
            background: #ffffff;
            overflow: hidden;
        }
        
        canvas {
            display: block;
            background-color: #fff;
        }
        
        .function-group_dt {
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 5px;
            background-color: #fafafa;
            margin-bottom: 8px;
            transition: all 0.3s;
        }
        
        .graph-hidden_dt {
            opacity: 0.6;
        }
        
        .selectable_dt {
            cursor: pointer;
            border-style: dashed;
        }
        
        .selected_dt {
            border-color: #28a745;
            background-color: #e8f5e9;
        }
        
        .function-group_dt label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
            color: #333;
        }
        
        .function-group_dt input[type="text"],
        .function-group_dt input[type="number"] {
            width: 100%;
            padding: 10px;
            margin-bottom: 5px;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 0.9rem;
        }
        
        .range-inputs_dt, .zoom-controls_dt, .extra-controls_dt {
            display: flex;
            gap: 4px;
            align-items: center;
            margin-top: 1px;
        }
        
        .range-inputs_dt div {
            flex: 1;
        }
        
        button {
            padding: 10px 15px;
            border: none;
            color: white;
            border-radius: 25px;
            cursor: pointer;
            font-size: 12px;
            transition: all 0.3s;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.15);
        }
        
        .draw-btn_dt {
            background: linear-gradient(135deg, #3498db, #2ecc71);
        }
        
        .add-btn_dt {
            background: linear-gradient(135deg, #2ecc71, #3498db);
        }
      
        .toggle-btn_dt {
            background: linear-gradient(135deg, #95a5a6, #7f8c8d);
        }
        
        .zoom-btn_dt {
            background: linear-gradient(135deg, #f39c12, #f1c40f);
            color: #333;
            flex: 1;
        }
        
        .delete-btn_dt {
            background: linear-gradient(135deg, #e74c3c, #FDB500);
            padding: 8px 12px;
            border-radius: 20px;
        }
        
        .toggle-visibility-btn_dt {
            background: linear-gradient(135deg, #3498db, #00FD6E);
            padding: 8px 12px;
            border-radius: 20px;
        }
        
        input_dt[type="color"] {
            width: 40px;
            height: 40px;
            border: 1px solid #ccc;
            padding: 2px;
            cursor: pointer;
            border-radius: 6px;
        }
        
        details_dt {
            border: 1px solid #ddd;
            border-radius: 8px;
            padding: 12px;
            margin-bottom: 9px;
            background: #fff;
        }
        
        legend_dt, summary_dt {
            padding: 0 5px;
            font-weight: bold;
            color: #333;
        }
        
        summary_dt {
            cursor: pointer;
            font-size: 1rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        #symbol-palette_dt {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            padding: 10px 0;
        }
        
        #symbol-palette_dt span {
            padding: 8px 12px;
            background: linear-gradient(135deg, #e0f7fa, #b2ebf2);
            border-radius: 6px;
            cursor: pointer;
            font-family: "Courier New", monospace;
            transition: all 0.2s;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        
        #symbol-palette_dt span:hover {
            transform: translateY(-3px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.15);
            background: linear-gradient(135deg, #b2ebf2, #80deea);
        }
        
        #area-info_dt {
            text-align: center;
            padding: 12px;
            background-color: #fffbe6;
            border: 1px solid #ffe58f;
            border-radius: 8px;
            margin-top: 9px;
            display: none;
            font-size: 0.9rem;
        }
        
        .display-options_dt {
            display: grid;
            grid-template-columns: 1.6fr 0.7fr 0.7fr;
            gap: 6px;
            margin-top: 5px;
        }
        
        .display-options_dt label {
            font-weight: normal;
            display: flex;
            align-items: center;
            gap: 5px;
        }
        
        .status-bar_dt {
            background: rgba(245, 245, 245, 0.95);
            padding: 10px 15px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.9rem;
            color: #555;
            border-top: 1px solid #ddd;
        }
        
        .controls-group_dt {
            display: flex;
            gap: 10px;
            align-items: center;
        }
        
        .zoom-controls_dt {
            display: flex;
            gap: 10px;
        }
        
        /* New styles for button group */
        .button-group_dt {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        
        .button-group_dt button {
            flex: 1;
            min-width: 120px;
        }
        
        /* New styles for axis labels */
        .axis-label-controls {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
            margin-top: 10px;
        }
        .axis-label-group {
		    width: 80%;
            display: flex;
            flex-direction: column;
        }
        
        .axis-label-group label {
            font-size: 1.5rem;
            margin-bottom: 5px;
            font-weight: bold;
        }
        
        .axis-label-group input {
            padding: 8px;
            border-radius: 4px;
            border: 1px solid #ccc;
            font-size: 0.9rem;
        }
        
        @media (max-width: 768px) {
            .main-content_dt {
                flex-direction: column;
            }
            
            #controls_dt {
                width: 100%;
                height: auto;
                border-right: none;
                border-bottom: 1px solid #ddd;
            }
            
            .button-group_dt {
                flex-direction: column;
            }
            
            .axis-label-controls {
                grid-template-columns: 1fr;
            }
        }