touchstone 0.12.1

Touchstone (s2p, etc.) file parser, plotter, and more
Documentation
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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Touchstone Viewer</title>
    <script src="./js/tailwindcss-3.4.17.js"></script>
    <!-- Plotly.js CDN -->
    <script src="./js/plotly-3.3.0.min.js"></script>
    <style>
        /* Smooth transition for dimensions and transform */
        .grid-item {
            transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
            display: flex;
            flex-direction: column;
            height: 350px;
            /* Base height for collapsed state */
        }

        /* Expanded State Logic */
        .grid-item.expanded {
            height: 600px;
            /* Expanded height */
            border-color: #3b82f6;
            /* Blue border to highlight active */
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }

        .toggle-icon {
            transition: transform 0.3s ease;
        }

        .expanded .toggle-icon {
            transform: rotate(180deg);
        }

        /* Ensure chart containers take full height */
        .chart-container {
            width: 100%;
            height: 100%;
            flex-grow: 1;
        }

        .action-btn {
            opacity: 0.8;
            transition: opacity 0.2s, background-color 0.2s, transform 0.1s;
            position: relative;
        }

        .action-btn:hover {
            opacity: 1;
            background-color: #f3f4f6;
            transform: translateY(-1px);
        }

        /* Custom Tooltip Style */
        #custom-tooltip {
            transition: opacity 0.15s ease;
        }
    </style>
</head>

<body class="bg-gray-100 min-h-screen p-4 md:p-8">

    <div class="max-w-6xl mx-auto mb-6">
        <h1 class="text-2xl font-bold text-gray-800">Network Performance</h1>
        <p class="text-gray-600">Click the hover icon (+) to cycle through nearest point, X-axis lock, Y-axis lock, and
            no hover modes.</p>
    </div>

    <!-- Main Grid Container -->
    <div class="grid grid-cols-1 md:grid-cols-2 gap-6 w-full max-w-6xl mx-auto">

        <!-- Item 1 -->
        <div id="card-s11"
            class="grid-item relative bg-white rounded-2xl shadow-md overflow-hidden border border-gray-200 p-4 col-span-1">
            <div class="flex justify-between items-start mb-2">
                <h2 class="text-lg font-bold text-gray-800 z-10 pointer-events-none truncate mr-2">S11 (Input Return
                    Loss)</h2>
                <div class="flex items-center space-x-1 z-20 flex-shrink-0">
                    <!-- Reset Zoom -->
                    <button onclick="resetZoom('plot-s11')" class="action-btn p-2 rounded-full"
                        data-tooltip="Reset Zoom">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15">
                            </path>
                        </svg>
                    </button>
                    <!-- Zoom In -->
                    <button onclick="zoomIn('plot-s11')" class="action-btn p-2 rounded-full" data-tooltip="Zoom In">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0zM10 7v6m3-3H7"></path>
                        </svg>
                    </button>
                    <!-- Zoom Out -->
                    <button onclick="zoomOut('plot-s11')" class="action-btn p-2 rounded-full" data-tooltip="Zoom Out">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0zM13 10H7"></path>
                        </svg>
                    </button>
                    <!-- Toggle Hover -->
                    <button id="hover-toggle-plot-s11" onclick="toggleHoverMode('plot-s11')"
                        class="action-btn p-2 rounded-full" data-tooltip="Toggle Hover Mode: Nearest Point">
                        <svg id="hover-icon-plot-s11" class="w-5 h-5 text-gray-700" fill="none" stroke="currentColor"
                            viewBox="0 0 24 24">
                            <!-- Default icon: Crosshair (Nearest) -->
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M4 12h16M12 4v16" />
                        </svg>
                    </button>
                    <!-- CSV Button -->
                    <button onclick="downloadCSV('plot-s11', 's11_data')" class="action-btn p-2 rounded-full"
                        data-tooltip="Download CSV">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z">
                            </path>
                        </svg>
                    </button>
                    <!-- Image Button -->
                    <button onclick="downloadImage('plot-s11', 's11_plot')" class="action-btn p-2 rounded-full"
                        data-tooltip="Download Image (PNG)">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M3 9a2 2 0 012-2h.93a2 2 0 001.664-.89l.812-1.22A2 2 0 0110.07 4h3.86a2 2 0 011.664.89l.812 1.22A2 2 0 0018.07 7H19a2 2 0 012 2v9a2 2 0 01-2 2H5a2 2 0 01-2-2V9z">
                            </path>
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M15 13a3 3 0 11-6 0 3 3 0 016 0z"></path>
                        </svg>
                    </button>
                    <!-- Expand Button -->
                    <button onclick="toggleExpand('card-s11')" class="action-btn p-2 rounded-full"
                        data-tooltip="Expand View">
                        <svg class="toggle-icon w-5 h-5 text-gray-700" fill="none" stroke="currentColor"
                            viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M4 8V4m0 0h4M4 4l5 5m11-1V4m0 0h-4m4 0l-5 5M4 16v4m0 0h4m-4 0l5-5m11 5l-5-5m5 5v-4m0 4h-4">
                            </path>
                        </svg>
                    </button>
                </div>
            </div>
            <div id="plot-s11" class="chart-container"></div>
        </div>

        <!-- Item 2 -->
        <div id="card-s12"
            class="grid-item relative bg-white rounded-2xl shadow-md overflow-hidden border border-gray-200 p-4 col-span-1">
            <div class="flex justify-between items-start mb-2">
                <h2 class="text-lg font-bold text-gray-800 z-10 pointer-events-none truncate mr-2">S12 (Reverse
                    Isolation)</h2>
                <div class="flex items-center space-x-1 z-20 flex-shrink-0">
                    <button onclick="resetZoom('plot-s12')" class="action-btn p-2 rounded-full"
                        data-tooltip="Reset Zoom">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15">
                            </path>
                        </svg>
                    </button>
                    <button onclick="zoomIn('plot-s12')" class="action-btn p-2 rounded-full" data-tooltip="Zoom In">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0zM10 7v6m3-3H7"></path>
                        </svg>
                    </button>
                    <button onclick="zoomOut('plot-s12')" class="action-btn p-2 rounded-full" data-tooltip="Zoom Out">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0zM13 10H7"></path>
                        </svg>
                    </button>
                    <button id="hover-toggle-plot-s12" onclick="toggleHoverMode('plot-s12')"
                        class="action-btn p-2 rounded-full" data-tooltip="Toggle Hover Mode: Nearest Point">
                        <svg id="hover-icon-plot-s12" class="w-5 h-5 text-gray-700" fill="none" stroke="currentColor"
                            viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M4 12h16M12 4v16" />
                        </svg>
                    </button>
                    <button onclick="downloadCSV('plot-s12', 's12_data')" class="action-btn p-2 rounded-full"
                        data-tooltip="Download CSV">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z">
                            </path>
                        </svg>
                    </button>
                    <button onclick="downloadImage('plot-s12', 's12_plot')" class="action-btn p-2 rounded-full"
                        data-tooltip="Download Image (PNG)">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M3 9a2 2 0 012-2h.93a2 2 0 001.664-.89l.812-1.22A2 2 0 0110.07 4h3.86a2 2 0 011.664.89l.812 1.22A2 2 0 0018.07 7H19a2 2 0 012 2v9a2 2 0 01-2 2H5a2 2 0 01-2-2V9z">
                            </path>
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M15 13a3 3 0 11-6 0 3 3 0 016 0z"></path>
                        </svg>
                    </button>
                    <button onclick="toggleExpand('card-s12')" class="action-btn p-2 rounded-full"
                        data-tooltip="Expand View">
                        <svg class="toggle-icon w-5 h-5 text-gray-700" fill="none" stroke="currentColor"
                            viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M4 8V4m0 0h4M4 4l5 5m11-1V4m0 0h-4m4 0l-5 5M4 16v4m0 0h4m-4 0l5-5m11 5l-5-5m5 5v-4m0 4h-4">
                            </path>
                        </svg>
                    </button>
                </div>
            </div>
            <div id="plot-s12" class="chart-container"></div>
        </div>

        <!-- Item 3 -->
        <div id="card-s21"
            class="grid-item relative bg-white rounded-2xl shadow-md overflow-hidden border border-gray-200 p-4 col-span-1">
            <div class="flex justify-between items-start mb-2">
                <h2 class="text-lg font-bold text-gray-800 z-10 pointer-events-none truncate mr-2">S21 (Insertion Loss)
                </h2>
                <div class="flex items-center space-x-1 z-20 flex-shrink-0">
                    <button onclick="resetZoom('plot-s21')" class="action-btn p-2 rounded-full"
                        data-tooltip="Reset Zoom">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15">
                            </path>
                        </svg>
                    </button>
                    <button onclick="zoomIn('plot-s21')" class="action-btn p-2 rounded-full" data-tooltip="Zoom In">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0zM10 7v6m3-3H7"></path>
                        </svg>
                    </button>
                    <button onclick="zoomOut('plot-s21')" class="action-btn p-2 rounded-full" data-tooltip="Zoom Out">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0zM13 10H7"></path>
                        </svg>
                    </button>
                    <button id="hover-toggle-plot-s21" onclick="toggleHoverMode('plot-s21')"
                        class="action-btn p-2 rounded-full" data-tooltip="Toggle Hover Mode: Nearest Point">
                        <svg id="hover-icon-plot-s21" class="w-5 h-5 text-gray-700" fill="none" stroke="currentColor"
                            viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M4 12h16M12 4v16" />
                        </svg>
                    </button>
                    <button onclick="downloadCSV('plot-s21', 's21_data')" class="action-btn p-2 rounded-full"
                        data-tooltip="Download CSV">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z">
                            </path>
                        </svg>
                    </button>
                    <button onclick="downloadImage('plot-s21', 's21_plot')" class="action-btn p-2 rounded-full"
                        data-tooltip="Download Image (PNG)">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M3 9a2 2 0 012-2h.93a2 2 0 001.664-.89l.812-1.22A2 2 0 0110.07 4h3.86a2 2 0 011.664.89l.812 1.22A2 2 0 0018.07 7H19a2 2 0 012 2v9a2 2 0 01-2 2H5a2 2 0 01-2-2V9z">
                            </path>
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M15 13a3 3 0 11-6 0 3 3 0 016 0z"></path>
                        </svg>
                    </button>
                    <button onclick="toggleExpand('card-s21')" class="action-btn p-2 rounded-full"
                        data-tooltip="Expand View">
                        <svg class="toggle-icon w-5 h-5 text-gray-700" fill="none" stroke="currentColor"
                            viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M4 8V4m0 0h4M4 4l5 5m11-1V4m0 0h-4m4 0l-5 5M4 16v4m0 0h4m-4 0l5-5m11 5l-5-5m5 5v-4m0 4h-4">
                            </path>
                        </svg>
                    </button>
                </div>
            </div>
            <div id="plot-s21" class="chart-container"></div>
        </div>

        <!-- Item 4 -->
        <div id="card-s22"
            class="grid-item relative bg-white rounded-2xl shadow-md overflow-hidden border border-gray-200 p-4 col-span-1">
            <div class="flex justify-between items-start mb-2">
                <h2 class="text-lg font-bold text-gray-800 z-10 pointer-events-none truncate mr-2">S22 (Output Return
                    Loss)</h2>
                <div class="flex items-center space-x-1 z-20 flex-shrink-0">
                    <button onclick="resetZoom('plot-s22')" class="action-btn p-2 rounded-full"
                        data-tooltip="Reset Zoom">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15">
                            </path>
                        </svg>
                    </button>
                    <button onclick="zoomIn('plot-s22')" class="action-btn p-2 rounded-full" data-tooltip="Zoom In">
                        <svg class="w-5 h-5 text-gray-600" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2"
                                d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0zM10 7v6m3-3H7"></path>
                        </svg>
                    </button>
                    <button onclick="zoomOut('plot-s22')" class="action-btn p-2 rounded-full" data-tooltip="Zoom Out">
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        // --- Tooltip Logic (Custom) ---
        const tooltip = document.createElement('div');
        tooltip.id = 'custom-tooltip';
        tooltip.className = 'fixed bg-gray-800 text-white text-xs rounded py-1 px-2 z-50 pointer-events-none hidden shadow-lg whitespace-nowrap';
        document.body.appendChild(tooltip);

        document.addEventListener('mouseover', e => {
            const target = e.target.closest('[data-tooltip]');
            if (target) {
                tooltip.textContent = target.dataset.tooltip;
                tooltip.classList.remove('hidden');

                const rect = target.getBoundingClientRect();

                // Wait for text to render to calculate width
                requestAnimationFrame(() => {
                    let left = rect.left + rect.width / 2 - tooltip.offsetWidth / 2;
                    let top = rect.bottom + 8;

                    // Edge detection
                    if (left + tooltip.offsetWidth > window.innerWidth - 10) {
                        left = window.innerWidth - tooltip.offsetWidth - 10;
                    }
                    if (left < 10) left = 10;

                    tooltip.style.left = `${left}px`;
                    tooltip.style.top = `${top}px`;
                });
            }
        });

        document.addEventListener('mouseout', e => {
            if (e.target.closest('[data-tooltip]')) {
                tooltip.classList.add('hidden');
            }
        });

        // --- Hover Mode Management ---
        const hoverModeMap = {
            'plot-s11': 'closest',
            'plot-s12': 'closest',
            'plot-s21': 'closest',
            'plot-s22': 'closest'
        };

        const HOVER_CYCLES = ['closest', 'x', 'y', false]; // false means disabled hover

        /**
         * Renders the appropriate SVG icon and updates the tooltip text.
         * @param {string} plotId The ID of the plot (e.g., 'plot-s11')
         * @param {string|false} mode The current Plotly hover mode or false
         */
        function updateHoverIcon(plotId, mode) {
            const iconContainer = document.getElementById(`hover-icon-${plotId}`);
            const button = document.getElementById(`hover-toggle-${plotId}`);
            let svgContent = '';
            let tooltipText = '';

            // Note: Setting stroke/fill/viewBox in the SVG tag itself
            switch (mode) {
                case 'closest':
                    tooltipText = 'Toggle Hover Mode: Nearest Point';
                    // Crosshair / Four-way arrow
                    svgContent = '<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 12h16M12 4v16" />';
                    break;
                case 'x':
                    tooltipText = 'Toggle Hover Mode: X-Axis Lock';
                    // Horizontal Arrows (Move along X)
                    svgContent = '<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 12H3M17 8l4 4-4 4M7 8l-4 4 4 4" />';
                    break;
                case 'y':
                    tooltipText = 'Toggle Hover Mode: Y-Axis Lock';
                    // Vertical Arrows (Move along Y)
                    svgContent = '<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 21V3M8 17l4 4 4-4M8 7l4-4 4 4" />';
                    break;
                case false:
                default:
                    tooltipText = 'Toggle Hover Mode: Disabled';
                    // Eye off (Disabled) - Updated path to avoid clipping
                    svgContent = '<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3.98 8.223A10.477 10.477 0 001.934 12C3.226 16.338 7.244 19.5 12 19.5c.993 0 1.953-.138 2.863-.395M6.228 6.228A10.45 10.45 0 0112 4.5c4.756 0 8.773 3.162 10.065 7.498a10.523 10.523 0 01-4.293 5.774M6.228 6.228L3 3m3.228 3.228l3.65 3.65m7.894 7.894L21 21m-3.228-3.228l-3.65-3.65m0 0a3 3 0 10-4.243-4.243m4.242 4.242L9.88 9.88" />';
                    break;
            }

            iconContainer.innerHTML = svgContent;
            button.dataset.tooltip = tooltipText;

            // Re-render Plotly with the new mode
            const plotlyMode = mode === false ? false : mode; // Plotly uses 'false' or 'closest', 'x', 'y'
            Plotly.relayout(plotId, { hovermode: plotlyMode });
        }


        function toggleHoverMode(plotId) {
            const currentMode = hoverModeMap[plotId] === false ? 'off' : hoverModeMap[plotId];
            const currentIndex = HOVER_CYCLES.indexOf(currentMode);
            const nextIndex = (currentIndex + 1) % HOVER_CYCLES.length;
            const newMode = HOVER_CYCLES[nextIndex];

            hoverModeMap[plotId] = newMode;
            updateHoverIcon(plotId, newMode);
        }

        // --- Plotly Chart Generation ---
        const commonLayout = {
            margin: { t: 40, r: 10, b: 40, l: 60 },
            paper_bgcolor: 'rgba(0,0,0,0)',
            plot_bgcolor: 'rgba(0,0,0,0)',
            font: { family: 'Inter, sans-serif' },
            showlegend: true,
            legend: {
                x: 1, xanchor: 'right', y: 1, bgcolor: 'rgba(255,255,255,0.5)',
                // title: {
                //     text: "Legend Title"
                // }
            },
            xaxis: {
                title: {
                    text: 'Frequency (GHz)'
                },
                // type: 'log',
                gridcolor: '#e5e7eb',
                tickformat: 's',      // use SI prefixes (f, p, n, ยต, m, k, M, G, T, etc.)
                exponentformat: 'SI', // use SI prefixes for hover text as well
            },
            yaxis: {
                title: {
                    text: 'Magnitude (dB)'
                },
                gridcolor: '#e5e7eb',
                rangemode: 'tozero'
            },
            title: { text: "S2P (dB) vs. Frequency (GHz)" },

            hovermode: 'closest' // Initial mode
        };
        const plotlyConfig = { responsive: true, displayModeBar: false };

        const plotTitles = {
            'plot-s11': 'S11 (dB) vs. Frequency (GHz)',
            'plot-s12': 'S12 (dB) vs. Frequency (GHz)',
            'plot-s21': 'S21 (dB) vs. Frequency (GHz)',
            'plot-s22': 'S22 (dB) vs. Frequency (GHz)'
        };

        const plotLayouts = {
            'plot-s11': {
                ...commonLayout,
                title: { text: plotTitles['plot-s11'] },
                // Fixed range from -40 dB to 0 dB
                yaxis: { ...commonLayout.yaxis, range: [-40, 0] }
            },
            'plot-s12': { ...commonLayout, title: { text: plotTitles['plot-s12'] } },
            'plot-s21': { ...commonLayout, title: { text: plotTitles['plot-s21'] } },
            'plot-s22': {
                ...commonLayout,
                title: { text: plotTitles['plot-s22'] },
                // Fixed range from -40 dB to 0 dB
                yaxis: { ...commonLayout.yaxis, range: [-40, 0] }
            },
        };

        const fileTraceColors = [
            '#3b82f6', // Blue
            '#ef4444', // Red
            '#10b981', // Green
            '#f59e0b', // Amber
            '#6366f1', // Indigo
            '#ec4899', // Pink
            '#84cc16', // Lime
            '#06b6d4', // Cyan
            '#a855f7', // Purple
            '#fdba74', // Orange (Light)
            '#14b8a6', // Teal
            '#eab308', // Yellow
            '#f43f5e', // Rose
            '#8b5cf6', // Violet
            '#d946ef', // Fuchsia
        ];

        function createTraces(xDataArray, yDataArray, names) {
            return names.map((name, i) => {
                return {
                    x: xDataArray[i],
                    y: yDataArray[i],
                    mode: 'lines',
                    name: name,
                    line: { color: fileTraceColors[i % fileTraceColors.length], width: 2 }
                };
            });
        }

        // Plots should be in global scope, but functions can facilitate traces
        // use a loop for more iteration
        Plotly.newPlot('plot-s11', createTraces(freqData, s11Data, networkNames), plotLayouts['plot-s11'], plotlyConfig);
        Plotly.newPlot('plot-s12', createTraces(freqData, s12Data, networkNames), plotLayouts['plot-s12'], plotlyConfig);
        Plotly.newPlot('plot-s21', createTraces(freqData, s21Data, networkNames), plotLayouts['plot-s21'], plotlyConfig);
        Plotly.newPlot('plot-s22', createTraces(freqData, s22Data, networkNames), plotLayouts['plot-s22'], plotlyConfig);

        // --- Action Functions ---

        function resetZoom(divId) {
            Plotly.relayout(divId, {
                'xaxis.autorange': true,
                'yaxis.autorange': true
            });
        }

        function zoomPlot(divId, factor) {
            const gd = document.getElementById(divId);
            if (!gd || !gd._fullLayout) return;

            const xaxis = gd._fullLayout.xaxis;
            const yaxis = gd._fullLayout.yaxis;

            // Helper to zoom a range
            const getNewRange = (range, isLog) => {
                // In Plotly, log ranges are stored as exponents (linear values)
                // So we can treat them as standard linear numbers for calculation
                const min = range[0];
                const max = range[1];
                const center = (max + min) / 2;
                const span = max - min;
                const newSpan = span * factor;
                return [center - newSpan / 2, center + newSpan / 2];
            };

            const newX = getNewRange(xaxis.range, xaxis.type === 'log');
            const newY = getNewRange(yaxis.range, yaxis.type === 'log');

            Plotly.relayout(divId, {
                'xaxis.range': newX,
                'yaxis.range': newY,
                'xaxis.autorange': false,
                'yaxis.autorange': false
            });
        }

        function zoomIn(divId) { zoomPlot(divId, 0.7); }
        function zoomOut(divId) { zoomPlot(divId, 1.3); }

        function downloadImage(divId, filename) {
            const plot = document.getElementById(divId);
            Plotly.downloadImage(plot, {
                format: 'png',
                filename: filename,
                height: 800,
                width: 1200,
                scale: 2 // Retina quality
            });
        }

        function downloadCSV(divId, filename) {
            const plot = document.getElementById(divId);
            const data = plot.data;

            // We assume all traces share the same X axis (Frequency) for simplicity
            // We will construct a CSV with: Frequency, Trace1_Y, Trace2_Y...

            let csvContent = "data:text/csv;charset=utf-8,";

            // 1. Create Headers
            let headers = ["Frequency (Hz)"];
            data.forEach(trace => {
                headers.push(`Magnitude (dB) - ${trace.name}`);
            });
            csvContent += headers.join(",") + "\r\n";

            // 2. Add Rows
            // We use the first trace to define the X rows
            const xValues = data[0].x;

            for (let i = 0; i < xValues.length; i++) {
                let row = [xValues[i]];
                data.forEach(trace => {
                    // Guard against traces having different lengths
                    row.push(trace.y[i] !== undefined ? trace.y[i] : "");
                });
                csvContent += row.join(",") + "\r\n";
            }

            // 3. Trigger Download
            const encodedUri = encodeURI(csvContent);
            const link = document.createElement("a");
            link.setAttribute("href", encodedUri);
            link.setAttribute("download", filename + ".csv");
            document.body.appendChild(link);
            link.click();
            document.body.removeChild(link);
        }


        // --- Expansion Logic ---
        function toggleExpand(cardId) {
            const card = document.getElementById(cardId);
            const allCards = document.querySelectorAll('.grid-item');
            const isExpanded = card.classList.contains('expanded');

            // 1. Reset all cards
            allCards.forEach(item => {
                item.classList.remove('expanded');
                item.classList.remove('md:col-span-2');
                item.classList.remove('row-span-2');
            });

            // 2. If it wasn't expanded, expand it now
            if (!isExpanded) {
                card.classList.add('expanded');
                card.classList.add('md:col-span-2');
                card.classList.add('row-span-2');
            }

            // 3. Resize Charts after CSS transition
            setTimeout(() => {
                allCards.forEach(item => {
                    const plotDiv = item.querySelector('.chart-container');
                    Plotly.Plots.resize(plotDiv);
                });
            }, 450);
        }

        // Handle window resize
        window.addEventListener('resize', () => {
            const plots = document.querySelectorAll('.chart-container');
            plots.forEach(p => Plotly.Plots.resize(p));
        });
    </script>
</body>

</html>