#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: #161b22;
            --accent-color: #58a6ff;
            --accent-success: #2ea44f;
            --accent-warning: #d29922;
            --text-color: #c9d1d9;
            --text-muted: #8b949e;
            --border-color: #30363d;
        }

        * {
            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-color);
            display: flex;
            height: 100vh;
            overflow: hidden;
        }

        .container {
            display: flex;
            width: 100%;
            height: 100%;
        }

        /* 布局：左侧展示 */
        .display-area {
            flex: 1;
            display: flex;
            flex-direction: column;
            padding: 20px;
            gap: 20px;
            height: 100%;
            overflow-y: auto;
        }

        /* 布局：右侧控制 */
        .control-area {
            width: 380px;
            background-color: var(--panel-bg);
            border-left: 1px solid var(--border-color);
            padding: 25px;
            display: flex;
            flex-direction: column;
            gap: 18px;
            height: 100%;
            overflow-y: auto;
            box-shadow: -5px 0 25px rgba(0,0,0,0.5);
        }

        h1 {
            font-size: 1.4rem;
            color: #fff;
            text-shadow: 0 0 10px rgba(88, 166, 255, 0.3);
            margin-bottom: 5px;
            border-bottom: 2px solid var(--border-color);
            padding-bottom: 10px;
        }

        h2 {
            font-size: 1.05rem;
            color: var(--accent-color);
            margin-bottom: 5px;
            text-align: center;
        }

        .simulation-card {
            background: rgba(22, 27, 34, 0.7);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 15px;
            position: relative;
        }

        .canvas-container {
            position: relative;
            width: 100%;
            height: 165px;
            background: #040609;
            border-radius: 6px;
            overflow: hidden;
            border: 1px dashed #444;
        }

        canvas#simCanvas {
            width: 100%;
            height: 100%;
        }

        .charts-container {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            flex: 1;
        }

        .chart-card {
            background: rgba(22, 27, 34, 0.7);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 15px;
            height: 100%;
            min-height: 260px;
            flex: 1 1 calc(50% - 10px); /* 核心：最小基准宽度为 50%，自动平分空间 */
        }

        /* 当屏幕特别窄（如手机竖屏，宽度小于 768px）时，自动切换为单列上下排布 */
        @media (max-width: 768px) {
            .chart-card {
                flex: 1 1 100%; /* 每张图表独占 100% 宽度 */
            }
        }

        .control-group {
            background: rgba(255,255,255,0.02);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 15px;
        }

        .slider-item {
            margin-bottom: 12px;
        }

        .slider-item:last-child {
            margin-bottom: 0;
        }

        .slider-label {
            display: flex;
            justify-content: space-between;
            font-size: 0.9rem;
            margin-bottom: 5px;
            color: var(--text-color);
            align-items: center;
        }

        .slider-label span.value {
            color: var(--accent-color);
            font-weight: bold;
            font-family: monospace;
            background: rgba(88, 166, 255, 0.1);
            padding: 2px 6px;
            border-radius: 4px;
        }

        input[type=range] {
            width: 100%;
            background: #30363d;
            accent-color: var(--accent-color);
            cursor: pointer;
        }

        .btn-group {
            display: flex;
            gap: 10px;
        }

        button {
            flex: 1;
            padding: 12px;
            border: none;
            border-radius: 6px;
            font-size: 1rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        button#startBtn {
            background-color: var(--accent-success);
            color: white;
        }
        button#startBtn:hover { background-color: #2c974b; }

        button#resetBtn {
            background-color: #21262d;
            color: #c9d1d9;
            border: 1px solid var(--border-color);
        }
        button#resetBtn:hover { background-color: #30363d; }

        button:disabled {
            opacity: 0.4;
            cursor: not-allowed;
        }

        .data-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
        }

        .data-item {
            background: #0d1117;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            padding: 8px 10px;
            text-align: center;
        }

        .data-item .label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 4px;
            display: block;
        }

        .data-item .val {
            font-size: 1.05rem;
            font-weight: bold;
            font-family: monospace;
            color: #fff;
        }

        .data-item.highlight .val {
            color: var(--accent-warning);
        }