#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;
            --text-main: #c9d1d9;
            --text-muted: #8b949e;
            --theme-cyan: #58a6ff;
            --theme-green: #3fb950;
            --theme-orange: #f0883e;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            user-select: none;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
            overflow: hidden;
            height: 100vh;
            display: flex;
            flex-direction: column;
        }

        header {
            background: linear-gradient(180deg, rgba(22,27,34,1) 0%, rgba(22,27,34,0) 100%);
            padding: 20px;
            text-align: center;
            position: absolute;
            top: 0;
            width: 100%;
            z-index: 10;
            pointer-events: none;
        }

        header h1 {
            font-size: 1.5rem;
            font-weight: 600;
            letter-spacing: 2px;
            color: #ffffff;
            text-shadow: 0 0 10px rgba(88, 166, 255, 0.6);
            margin-bottom: 5px;
        }

        header p {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        #canvas-container {
            flex: 1;
            position: relative;
            width: 100%;
            height: 100%;
        }

        canvas {
            display: block;
            width: 100%;
            height: 100%;
            cursor: crosshair;
        }

        .dashboard {
            position: absolute;
            top: 100px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            backdrop-filter: blur(12px);
            border-radius: 16px;
            padding: 20px;
            display: grid;
            grid-template-columns: repeat(3, 180px);
            gap: 15px 25px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.1);
            z-index: 10;
        }

        .data-item {
            display: flex;
            flex-direction: column;
        }

        .data-label {
            font-size: 0.75rem;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 4px;
        }

        .data-value {
            font-family: 'Courier New', Courier, monospace;
            font-size: 1.4rem;
            font-weight: bold;
            color: #ffffff;
        }

        /* 科技感高亮颜色分类 */
        .cyan { color: var(--theme-cyan); text-shadow: 0 0 8px rgba(88,166,255,0.4); }
        .green { color: var(--theme-green); text-shadow: 0 0 8px rgba(63,185,80,0.4); }
        .orange { color: var(--theme-orange); text-shadow: 0 0 8px rgba(240,136,62,0.4); }

        .hint-box {
            position: absolute;
            top: 85px;
            left: 50%;
            transform: translateX(-50%);
            background: rgba(255,255,255,0.05);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
            color: var(--text-muted);
            border: 1px solid rgba(255,255,255,0.05);
            pointer-events: none;
            transition: opacity 0.3s;
        }

        .hidden {
            opacity: 0;
        }