#menuBtn{
        position: fixed;
        top: 20px;
        left: 20px;
        z-index: 20;
        width: auto;
        padding: 12px 18px;
        border: none;
        border-radius: 14px;
        background: rgba(20,40,80,0.85);
        color: #d8ecff;
        font-size: 15px;
        cursor: pointer;
        backdrop-filter: blur(10px);
        border: 1px solid rgba(120,180,255,0.25);
        box-shadow:
            0 0 18px rgba(0,140,255,0.25);
        transition: 0.25s;
    }
    #menuBtn:hover{
        transform: translateY(-2px);
        background: rgba(40,80,140,0.95);
        box-shadow:
            0 0 24px rgba(80,180,255,0.45);
    }




        :root {
            --bg-color: #0d1117;
            --panel-bg: rgba(22, 27, 34, 0.85);
            --border-color: #30363d;
            --accent-blue: #58a6ff;
            --accent-green: #3fb950;
            --accent-orange: #d29922;
            --accent-red: #f85149;
            --accent-purple: #bc8cff;
            --text-main: #c9d1d9;
            --text-sub: #8b949e;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            overflow-x: hidden;
            overflow-y: auto;
        }

        .container {
            display: flex;
            flex-direction: row;
            width: 95vw;
            height: 92vh;
            max-width: 1600px;
            gap: 20px;
            padding: 15px;
            background: radial-gradient(circle at 10% 20%, rgba(88, 166, 255, 0.05) 0%, transparent 40%);
        }

        /* 左侧展示区 */
        .viewport-panel {
            flex: 1.4;
            display: flex;
            flex-direction: column;
            gap: 15px;
            min-width: 300px;
        }

        .canvas-card {
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 12px;
            position: relative;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            backdrop-filter: blur(10px);
            display: flex;
            flex-direction: column;
        }

        .canvas-card h3 {
            font-size: 0.9rem;
            color: var(--accent-blue);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 6px;

    justify-content: end; 
        }

        .canvas-card h3::before {
            content: '';
            display: inline-block;
            width: 8px;
            height: 8px;
            background: var(--accent-blue);
            border-radius: 50%;
            box-shadow: 0 0 8px var(--accent-blue);
        }

        canvas {
            width: 100%;
            height: 100%;
            border-radius: 6px;
            background-color: #05070a;
        }

        #simCanvas {
            flex: 1;
            min-height: 150px;
        }

        #graphCanvas {
            flex: 1;
            min-height: 250px;
        }

        /* 右侧控制区 */
        .control-panel {
            flex: 0.8;
            min-width: 320px;
            max-width: 480px;
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 18px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            backdrop-filter: blur(10px);
            overflow-y: auto;
        }

        .header h1 {
            font-size: 1.4rem;
            color: #ffffff;
            font-weight: 600;
            background: linear-gradient(90deg, #ffffff, var(--accent-blue));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .header p {
            font-size: 0.8rem;
            color: var(--text-sub);
            margin-top: 4px;
        }

        /* 实时数据网格 */
        .data-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 10px;
        }

        .data-item {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.05);
            border-radius: 8px;
            padding: 8px 12px;
        }

        .data-item.full-width {
            grid-column: span 2;
        }

        .data-label {
            font-size: 0.75rem;
            color: var(--text-sub);
        }

        .data-value {
            font-size: 1.1rem;
            font-weight: 600;
            font-family: 'Courier New', Courier, monospace;
            margin-top: 2px;
        }

        .val-v { color: var(--accent-green); }
        .val-a { color: var(--accent-orange); }
        .val-ek { color: var(--accent-purple); }
        .val-ep { color: var(--accent-blue); }
        .val-x { color: #ffffff; }

        /* 参数滑动条控制 */
        .controls-group {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .control-item {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .control-label-row {
            display: flex;
            justify-content: space-between;
            font-size: 0.85rem;
        }

        .control-label-row span:last-child {
            font-family: monospace;
            color: var(--accent-blue);
        }

        input[type="range"] {
            -webkit-appearance: none;
            width: 100%;
            height: 5px;
            border-radius: 3px;
            background: #21262d;
            outline: none;
        }

        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--accent-blue);
            cursor: pointer;
            box-shadow: 0 0 10px var(--accent-blue);
            transition: transform 0.1s;
        }

        input[type="range"]::-webkit-slider-thumb:hover {
            transform: scale(1.2);
        }

        /* 按钮组 */
        .btn-group {
            display: flex;
            gap: 12px;
            margin-top: auto;
        }

        button {
            flex: 1;
            padding: 10px;
            border: none;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        #startBtn {
            background: var(--accent-green);
            color: #000;
            box-shadow: 0 0 12px rgba(63, 185, 80, 0.3);
        }

        #startBtn:hover {
            background: #46cd59;
            box-shadow: 0 0 18px rgba(63, 185, 80, 0.5);
        }

        #resetBtn {
            background: rgba(255, 255, 255, 0.1);
            color: var(--text-main);
            border: 1px solid var(--border-color);
        }

        #resetBtn:hover {
            background: rgba(255, 255, 255, 0.2);
        }

        /* 图例说明 */
        .legend {
            display: flex;
            gap: 12px;
            font-size: 0.75rem;
            color: var(--text-sub);
            justify-content: flex-end;
            margin-bottom: 4px;
        }
        .legend-item { display: flex; align-items: center; gap: 4px; }
        .legend-color { width: 10px; height: 3px; border-radius: 2px; }

        /* 响应式调整：屏幕较小时上下排列并自适应滚动 */
        @media (max-width: 900px) {
            body {
                overflow-y: auto;
                align-items: flex-start;
            }

            .container {
                flex-direction: column;
                height: auto;
                min-height: 100vh;
                padding: 10px;
            }

            .viewport-panel {
                height: 600px;
            }

            .control-panel {
                max-width: 100%;
            }
        }