<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>SEG WebGPU Dashboard</title>
  <style>
    *, *::before, *::after { box-sizing: border-box; }

    body {
      margin: 0;
      overflow: hidden;
      background: #050a0f;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      color: #0ff;
      display: flex;
      flex-direction: column;
      height: 100vh;
    }

    /* ── Top header bar ────────────────────────────────── */
    #header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 6px 16px;
      background: rgba(0,10,20,0.95);
      border-bottom: 1px solid #0ff3;
      flex-shrink: 0;
      height: 44px;
    }
    #header h1 {
      margin: 0;
      font-size: 1rem;
      color: #0ff;
      text-shadow: 0 0 8px #0ff8;
      letter-spacing: 2px;
      text-transform: uppercase;
    }
    .header-right {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.75rem;
      color: #0aa;
    }
    .status-badge {
      display: flex;
      align-items: center;
      gap: 6px;
      padding: 3px 10px;
      border: 1px solid #0ff4;
      border-radius: 12px;
      font-size: 0.75rem;
    }
    .status-indicator {
      width: 8px; height: 8px;
      border-radius: 50%;
    }
    .status-standby  { background: #00d4ff; box-shadow: 0 0 6px #00d4ff; }
    .status-active   { background: #00ff88; box-shadow: 0 0 6px #00ff88; animation: blink 1.5s infinite; }
    .status-inactive { background: #ff6600; box-shadow: 0 0 6px #ff6600; }
    @keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.4} }

    /* ── Main layout: left panel | canvas | right panel ── */
    #main {
      display: flex;
      flex: 1;
      overflow: hidden;
    }

    /* ── Left sidebar ─────────────────────────────────── */
    #left-panel {
      width: 220px;
      flex-shrink: 0;
      background: rgba(0,8,16,0.97);
      border-right: 1px solid #0ff2;
      padding: 12px;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .panel-section {
      border: 1px solid #0ff2;
      border-radius: 6px;
      padding: 10px;
      background: rgba(0,20,30,0.6);
    }
    .panel-section h3 {
      margin: 0 0 8px 0;
      font-size: 0.65rem;
      color: #0aa;
      text-transform: uppercase;
      letter-spacing: 2px;
      border-bottom: 1px solid #0ff1;
      padding-bottom: 5px;
    }

    /* Mode buttons */
    .mode-btn {
      display: block;
      width: 100%;
      margin: 5px 0;
      padding: 8px 10px;
      background: #07101a;
      border: 1px solid #0ff4;
      color: #0cc;
      cursor: pointer;
      transition: all 0.25s;
      border-radius: 4px;
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.8px;
      text-align: left;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .mode-btn .mode-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: var(--mode-icon-size, 18px);
      height: var(--mode-icon-size, 18px);
      border: 1px solid currentColor;
      border-radius: 3px;
      font-size: 0.65rem;
      flex-shrink: 0;
      opacity: 0.75;
    }
    .mode-btn:hover  { background: #0ff2; color: #0ff; border-color: #0ff; box-shadow: 0 0 8px #0ff4; }
    .mode-btn.active { background: #00d4ff22; color: #0ff; border-color: #0ff; box-shadow: 0 0 10px #0ff5; }
    .mode-btn.active .mode-icon { opacity: 1; }

    /* SEG layout preset buttons */
    .layout-btn {
      display: block;
      width: 100%;
      margin: 4px 0;
      padding: 6px 8px;
      background: #07101a;
      border: 1px solid #0ff3;
      color: #0aa;
      cursor: pointer;
      transition: all 0.25s;
      border-radius: 4px;
      font-size: 0.68rem;
      font-weight: 600;
      text-align: left;
      letter-spacing: 0.3px;
    }
    .layout-btn:hover  { background: #0ff1; color: #0ff; border-color: #0ff6; }
    .layout-btn.active { background: #00d4ff18; color: #0ff; border-color: #0ff; box-shadow: 0 0 8px #0ff4; }

    /* Control buttons */
    .ctrl-row {
      display: flex;
      gap: 6px;
    }
    .ctrl-btn {
      flex: 1;
      padding: 9px 6px;
      border-radius: 5px;
      font-size: 0.8rem;
      font-weight: 700;
      cursor: pointer;
      border: none;
      transition: all 0.2s;
      text-transform: uppercase;
      letter-spacing: 1px;
    }
    #startBtn {
      background: linear-gradient(135deg,#004d2a,#006b3a);
      color: #00ff88;
      border: 1px solid #00ff88;
      box-shadow: 0 0 8px #00ff8844;
    }
    #startBtn:hover { background: linear-gradient(135deg,#006b3a,#009955); box-shadow: 0 0 14px #00ff8877; }
    #stopBtn {
      background: linear-gradient(135deg,#4d1a00,#6b2500);
      color: #ff6600;
      border: 1px solid #ff6600;
      box-shadow: 0 0 8px #ff660044;
    }
    #stopBtn:hover { background: linear-gradient(135deg,#7a2e00,#993800); box-shadow: 0 0 14px #ff660077; }
    #resetBtn {
      background: #07101a;
      color: #0aa;
      border: 1px solid #0ff3;
    }
    #resetBtn:hover { color: #0ff; border-color: #0ff6; }

    /* Sliders */
    .slider-row {
      margin: 6px 0;
    }
    .slider-row label {
      display: flex;
      justify-content: space-between;
      font-size: 0.72rem;
      color: #0aa;
      margin-bottom: 4px;
    }
    .slider-row label span { color: #0ff; font-weight: bold; }
    input[type="range"] {
      width: 100%;
      accent-color: #0ff;
      cursor: pointer;
      height: 4px;
    }

    /* Particle slider row */
    #particleSlider { accent-color: #f0f; }

    /* ── Canvas area ───────────────────────────────────── */
    #canvas-wrapper {
      flex: 1;
      position: relative;
      overflow: hidden;
    }
    canvas {
      display: block;
      width: 100%;
      height: 100%;
    }

    /* Corner overlays */
    .corner-label {
      position: absolute;
      font-size: 0.65rem;
      color: #0ff6;
      font-family: monospace;
      pointer-events: none;
    }
    #corner-tl { top: 8px; left: 8px; }
    #corner-tr { top: 8px; right: 8px; text-align: right; }
    #corner-bl { bottom: 8px; left: 8px; }

    #replay-badge {
      display: flex;
      align-items: center;
      gap: 6px;
      padding: 3px 10px;
      border: 1px solid #f0a;
      border-radius: 12px;
      font-size: 0.72rem;
      letter-spacing: 1px;
      color: #f6c;
      background: rgba(80, 0, 40, 0.45);
    }
    #replay-badge[hidden] { display: none !important; }
    .replay-badge-dot {
      width: 8px; height: 8px; border-radius: 50%;
      background: #f0a; box-shadow: 0 0 6px #f0a;
      animation: blink 1.2s infinite;
    }
    body.replay-mode #status { color: #f6c; }

    #replay-bar {
      position: absolute;
      left: 8px;
      right: 8px;
      bottom: 8px;
      z-index: 40;
      display: flex;
      flex-direction: column;
      gap: 6px;
      padding: 8px 10px;
      pointer-events: auto;
      background: rgba(4, 12, 20, 0.88);
      border: 1px solid var(--sci-border-cyan, #0ff4);
      border-radius: 8px;
      box-shadow: 0 0 16px rgba(0, 255, 255, 0.12);
      backdrop-filter: blur(12px);
    }
    #replay-bar[hidden] { display: none !important; }
    .replay-bar-row {
      display: flex;
      align-items: center;
      gap: 8px;
      min-width: 0;
    }
    .replay-bar-title {
      font-size: 0.68rem;
      letter-spacing: 1.4px;
      text-transform: uppercase;
      color: var(--sci-cyan, #0ff);
      white-space: nowrap;
    }
    #replayFileName {
      font-size: 0.65rem;
      color: #0aa;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
      min-width: 0;
      flex: 1;
    }
    #replayTime {
      font-family: ui-monospace, monospace;
      font-size: 0.68rem;
      color: #0ff;
      white-space: nowrap;
    }
    #replayScrub { flex: 1; min-width: 80px; accent-color: #f0a; }
    #replayStatus { font-size: 0.62rem; color: #0aa; }
    #replayStatus.replay-status-error { color: #f66; }
    #canvas-wrapper.replay-drop-active {
      outline: 2px dashed #f0a;
      outline-offset: -6px;
    }
    body.replay-ui-open #tachometer { bottom: 86px; }

    /* WebGPU hard-fail (no WebGL2 auto-fallback) */
    #webgpu-hard-fail {
      position: fixed;
      inset: 0;
      z-index: 10000;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 24px;
      background: rgba(2, 6, 12, 0.94);
      color: #cde;
      font-family: 'Segoe UI', system-ui, sans-serif;
    }
    .webgpu-hard-fail-card {
      max-width: 640px;
      width: 100%;
      border: 1px solid #f64;
      border-radius: 10px;
      padding: 20px 22px;
      background: rgba(20, 8, 10, 0.95);
      box-shadow: 0 0 32px rgba(255, 60, 40, 0.2);
    }
    .webgpu-hard-fail-card h2 {
      margin: 0 0 10px;
      color: #f88;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      font-size: 1.1rem;
    }
    .webgpu-hard-fail-lead { color: #eab; line-height: 1.45; }
    .webgpu-hard-fail-hint { color: #fc8; line-height: 1.4; }
    .webgpu-hard-fail-pre {
      max-height: 240px;
      overflow: auto;
      font-size: 0.68rem;
      background: #0a0e14;
      border: 1px solid #633;
      padding: 10px;
      border-radius: 6px;
      color: #9cf;
      white-space: pre-wrap;
      word-break: break-word;
    }
    .webgpu-hard-fail-foot { font-size: 0.75rem; color: #889; }
    body.webgpu-hard-fail #canvas-wrapper { pointer-events: none; opacity: 0.25; }

    /* ── Tachometer overlay ────────────────────────────────────────────── */
    #tachometer {
      position: absolute;
      bottom: 8px;
      right: 8px;
      width: 140px;
      background: rgba(0, 8, 16, 0.78);
      border: 1px solid #0ff3;
      border-radius: 4px;
      padding: 5px 8px 6px;
      pointer-events: none;
      font-family: monospace;
      font-size: 0.62rem;
      color: #0aa;
      display: flex;
      flex-direction: column;
      gap: 3px;
    }
    #tachometer .tach-title {
      font-size: 0.58rem;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: #0ff8;
    }
    #tachometer .tach-track {
      width: 100%;
      height: 8px;
      background: rgba(0, 255, 255, 0.08);
      border-radius: 2px;
      overflow: hidden;
    }
    #tachometer .tach-fill {
      height: 100%;
      width: 5%;
      border-radius: 2px;
      transition: width 0.1s ease, background 0.3s ease;
      background: hsl(120, 100%, 50%);
    }
    #tachometer .tach-fill.overdrive {
      animation: overdrivePulse 0.4s ease-in-out infinite alternate;
    }
    @keyframes overdrivePulse {
      from { filter: brightness(1.0); }
      to   { filter: brightness(2.2) drop-shadow(0 0 4px currentColor); }
    }
    #tachometer .tach-label {
      font-size: 0.75rem;
      font-weight: bold;
      color: hsl(120, 100%, 65%);
      text-align: right;
    }

    /* ── Right telemetry panel ─────────────────────────── */
    #right-panel {
      width: 200px;
      flex-shrink: 0;
      background: rgba(0,8,16,0.97);
      border-left: 1px solid #0ff2;
      padding: 12px;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .reading-card {
      background: rgba(0,20,30,0.7);
      border: 1px solid #0ff2;
      border-radius: 6px;
      padding: 8px 10px;
    }
    .reading-label {
      font-size: 0.58rem;
      color: #0777;
      text-transform: uppercase;
      letter-spacing: 1.8px;
      margin-bottom: 2px;
    }
    .reading-value {
      font-size: 1.0rem;
      font-family: 'Courier New', monospace;
      color: #0ff;
      font-weight: bold;
      text-shadow: 0 0 6px #0ff6;
    }
    .reading-value.warning  { color: #ffaa00; text-shadow: 0 0 6px #ffaa0066; }
    .reading-value.critical { color: #ff3300; text-shadow: 0 0 8px #ff330088; }

    /* Right-panel section header / separator */
    .telem-section {
      font-size: 0.58rem;
      color: #0ff5;
      text-transform: uppercase;
      letter-spacing: 2px;
      padding: 4px 2px 2px;
      border-top: 1px solid #0ff2;
      margin-top: 4px;
    }
    .telem-section:first-child {
      border-top: none;
      margin-top: 0;
    }

    /* RPM gauge ring */
    .rpm-ring {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 8px;
      background: radial-gradient(circle,rgba(0,255,255,0.05),transparent 70%);
    }
    .rpm-value {
      font-size: 1.4rem;
      font-family: 'Courier New', monospace;
      color: #0ff;
      font-weight: bold;
      text-shadow: 0 0 12px #0ffa;
    }
    .rpm-unit {
      font-size: 0.65rem;
      color: #0aa;
      text-transform: uppercase;
    }

    /* Mini bar chart for efficiency */
    .mini-bar {
      height: 4px;
      background: #0ff1;
      border-radius: 2px;
      margin-top: 4px;
      overflow: hidden;
    }
    .mini-bar-fill {
      height: 100%;
      background: linear-gradient(90deg, #0ff, #0f8);
      border-radius: 2px;
      transition: width 0.5s;
    }

    /* ── Bottom status bar ─────────────────────────────── */
    #footer {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 4px 16px;
      background: rgba(0,10,20,0.95);
      border-top: 1px solid #0ff2;
      flex-shrink: 0;
      height: 30px;
      font-size: 0.68rem;
      color: #0aa;
      font-family: monospace;
    }
    #footer span { color: #0ff; }

    #energyNetworkDisclaimer {
      position: fixed;
      bottom: 32px;
      left: 50%;
      transform: translateX(-50%);
      max-width: min(92vw, 640px);
      padding: 6px 14px;
      border-radius: 6px;
      background: rgba(0, 12, 24, 0.88);
      border: 1px solid #0ff4;
      color: #8ad;
      font-size: 0.68rem;
      text-align: center;
      pointer-events: none;
      z-index: 50;
      display: none;
    }
    body.overview-mode #energyNetworkDisclaimer { display: block; }
    #energyNetworkDisclaimer[data-mode="coupled"] {
      border-color: #4f8;
      color: #9fc;
    }
    #energyNetworkDisclaimer.energy-residual-warn {
      border-color: #f84;
      color: #fcc;
      background: rgba(40, 8, 8, 0.92);
    }

    #hw-twin-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 10px;
      border-radius: 4px;
      background: rgba(0, 20, 30, 0.85);
      border: 1px solid #345;
      font-size: 0.72rem;
      color: #678;
    }
    #hw-twin-badge[data-state="mock"] {
      border-color: #a80;
      color: #fc6;
    }
    #hw-twin-badge[data-state="serial"] {
      border-color: #0a8;
      color: #9fc;
    }
    .hw-twin-dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: #456;
    }
    #hw-twin-badge[data-state="mock"] .hw-twin-dot { background: #fa0; box-shadow: 0 0 6px #fa0; }
    #hw-twin-badge[data-state="serial"] .hw-twin-dot { background: #0f8; box-shadow: 0 0 6px #0f8; }

    .sci-shadow-residual-readouts {
      display: flex;
      gap: 12px;
      padding: 8px 10px 4px;
      font-size: 0.68rem;
      color: #8ad;
      font-family: var(--sci-font-mono, monospace);
    }
    .sci-shadow-residual-readouts b { color: #fc6; font-weight: 600; }
    .sci-shadow-hint {
      margin: 0;
      padding: 4px 10px 8px;
      font-size: 0.58rem;
      color: #567;
      line-height: 1.35;
    }
    .sci-shadow-sparkline { height: 72px; }

    /* SEG explainer / classroom */
    .seg-explainer-glossary {
      margin: 8px 0 0; font-size: 0.58rem; color: #5a8;
      display: grid; grid-template-columns: auto 1fr; gap: 2px 8px;
    }
    .seg-explainer-glossary dt { color: #0aa; }
    .seg-explainer-glossary dd { margin: 0; color: #0ff; }
    body.seg-classroom-mode #left-panel .panel-section:not(#seg-explainer-section):not(:first-child) {
      opacity: 0.35; pointer-events: none;
    }
    body.seg-classroom-mode #seg-explainer-section,
    body.seg-classroom-mode .panel-section:first-child {
      opacity: 1; pointer-events: auto;
    }
    body.seg-classroom-mode #debug-panel,
    body.seg-classroom-mode .corner-label#corner-tr {
      display: none !important;
    }
    body.seg-tour-active #seg-tour-overlay {
      display: block;
    }

    /* Scrollbar styling */
    ::-webkit-scrollbar { width: 4px; }
    ::-webkit-scrollbar-track { background: #050a0f; }
    ::-webkit-scrollbar-thumb { background: #0ff3; border-radius: 2px; }

    /* ── WASM status badge ──────────────────────────────── */
    #wasm-badge {
      display: flex;
      align-items: center;
      gap: 6px;
      padding: 3px 10px;
      border: 1px solid #0ff4;
      border-radius: 12px;
      font-size: 0.72rem;
      color: #0aa;
    }
    .wasm-dot {
      width: 7px; height: 7px;
      border-radius: 50%;
      background: #444;
    }
    .wasm-dot.loaded  { background: #00ff88; box-shadow: 0 0 6px #00ff88; }
    .wasm-dot.loading { background: #ffcc00; box-shadow: 0 0 6px #ffcc00; animation: blink 1s infinite; }
    .wasm-dot.missing { background: #ff6600; }

    /* ── WASM demo panel ────────────────────────────────── */
    #wasm-results {
      display: none;
      margin-top: 6px;
      font-size: 0.70rem;
      color: #0aa;
      line-height: 1.6;
    }
    #wasm-results.visible { display: block; }
  </style>
  <script type="module" crossorigin src="./assets/index-C4kVCkDE.js"></script>
  <link rel="stylesheet" crossorigin href="./assets/index-B6-yM-og.css">
</head>
<body>

  <!-- ── Header ─────────────────────────────────────────── -->
  <div id="header">
    <h1>SEG WebGPU Dashboard</h1>
    <div class="header-right">
      <div id="hw-twin-badge" data-state="disconnected" title="Hardware digital twin connection">
        <span class="hw-twin-dot" aria-hidden="true"></span>
        <span id="hwTwinBadgeText">Twin off</span>
      </div>
      <div id="replay-badge" hidden title="Replay mode — live plant is paused">
        <span class="replay-badge-dot" aria-hidden="true"></span>
        <span id="replayBadgeText">REPLAY</span>
      </div>
      <div id="wasm-badge">
        <div class="wasm-dot loading" id="wasmDot"></div>
        <span id="wasmStatus">WASM…</span>
      </div>
      <div class="status-badge">
        <div class="status-indicator status-standby" id="statusDot"></div>
        <span id="status">STANDBY</span>
      </div>
      <span>FPS: <span id="fps">--</span></span>
    </div>
  </div>

  <!-- ── Main ───────────────────────────────────────────── -->
  <div id="main">

    <!-- Left sidebar -->
    <div id="left-panel">
      <button type="button" class="seg-panel-collapse-btn" id="collapse-left" title="Collapse controls" aria-label="Collapse controls">‹</button>

      <!-- Power controls -->
      <div class="panel-section">
        <h3>Unit Control</h3>
        <div class="seg-op-btn-row">
          <button class="seg-op-btn seg-op-btn-start ctrl-btn" id="startBtn" title="Spin-up (S)">▶ Spin-up</button>
          <button class="seg-op-btn seg-op-btn-estop ctrl-btn" id="stopBtn" title="Emergency stop (Shift+E)">⏹ E-Stop</button>
          <button class="seg-op-btn seg-op-btn-reset ctrl-btn" id="resetBtn" title="Reset unit (R)">↺ Reset</button>
        </div>
      </div>

      <!-- Drive parameters -->
      <div class="panel-section">
        <h3>Excitation &amp; Load</h3>
        <div class="slider-row">
          <label>Drive Setpoint <span id="driveVal">50%</span></label>
          <input type="range" id="driveControl" min="0" max="100" step="1" value="50" aria-label="Drive setpoint">
        </div>
        <div class="slider-row">
          <label>Field Excitation <span id="fieldVal">50</span>%</label>
          <input type="range" id="fieldControl" min="0" max="100" step="1" value="50" aria-label="Magnetic field excitation">
        </div>
        <div class="slider-row">
          <label>Output Load <span id="loadVal">100</span>Ω</label>
          <input type="range" id="loadControl" min="10" max="1000" step="10" value="100" aria-label="Output load resistance">
        </div>
      </div>

      <!-- Sim rate (time dilation — separate from plant drive) -->
      <div class="panel-section">
        <h3>Sim Rate</h3>
        <div class="slider-row">
          <label>Time Dilation <span id="speedVal">1.00×</span></label>
          <input type="range" id="speedControl" min="0" max="100" step="1" value="50" aria-label="Simulation time dilation">
        </div>
        <label style="display:flex;align-items:center;cursor:pointer;font-size:0.68rem;color:#0aa;margin-top:6px;">
          <input type="checkbox" id="schematicToggle" style="margin-right:6px;">
          <span>Schematic overlay</span>
        </label>
      </div>

      <!-- Simulation mode -->
      <div class="panel-section">
        <h3>Simulation Mode</h3>
        <button class="mode-btn active" id="btn-seg"    onclick="setMode('seg')">🔮 SEG Generator</button>
        <button class="mode-btn"        id="btn-heron"  onclick="setMode('heron')">💧 Heron's Fountain</button>
        <button class="mode-btn"        id="btn-kelvin" onclick="setMode('kelvin')">⚡ Kelvin Thunderstorm</button>
        <button class="mode-btn"        id="btn-solar"  onclick="setMode('solar')">☀️ LEDs + Solar</button>
        <button class="mode-btn"        id="btn-mhd"    onclick="setMode('mhd')">🌊 MHD Generator</button>
        <button class="mode-btn"        id="btn-peltier" onclick="setMode('peltier')">🔥 Peltier</button>
        <button class="mode-btn"        id="btn-maglev" onclick="setMode('maglev')">🧲 Mag Levitation</button>
        <button class="mode-btn"        id="btn-homopolar" onclick="setMode('homopolar')">⚙️ Homopolar</button>
        <button class="mode-btn"        id="btn-halbach-viz" onclick="setMode('halbach-viz')">🧭 Halbach Field</button>
        <button class="mode-btn"        id="btn-pulse-coil" onclick="setMode('pulse-coil')">🔋 Pulse Coil</button>
        <button class="mode-btn"        id="btn-transformer" onclick="setMode('transformer')">🔌 Mutual Induction</button>
        <button class="mode-btn"        id="btn-vdg" onclick="setMode('vdg')">⚡️ Van de Graaff</button>
        <button class="mode-btn"        id="btn-hall" onclick="setMode('hall')">🧲 Hall-Effect Bench</button>
      </div>

      <!-- Transformer classroom controls -->
      <div class="panel-section" id="transformer-controls" style="display:none;">
        <h3>Coupling</h3>
        <button type="button" class="layout-btn active" data-transformer-leakage="false" onclick="setTransformerLeakage(false)">Ideal (high k)</button>
        <button type="button" class="layout-btn" data-transformer-leakage="true" onclick="setTransformerLeakage(true)">Leakage</button>
        <div style="font-size:0.68rem;color:#0aa;margin-top:6px;line-height:1.4;">Textbook two-winding model — not FEM. k drops under leakage.</div>
      </div>

      <!-- Hall-effect bench classroom controls -->
      <div class="panel-section" id="hall-controls" style="display:none;">
        <h3>Carrier density</h3>
        <button type="button" class="layout-btn active" data-hall-carrier="semiconductor" onclick="setHallCarrierType('semiconductor')">Semiconductor</button>
        <button type="button" class="layout-btn" data-hall-carrier="metal" onclick="setHallCarrierType('metal')">Metal</button>
        <div style="font-size:0.68rem;color:#0aa;margin-top:6px;line-height:1.4;">Lumped V_H = IB/(net) model — not a calibrated metrology instrument. Metal's high carrier density gives a much smaller Hall voltage.</div>
      </div>

      <!-- SEG roller/stator layout preset -->
      <div class="panel-section" id="seg-layout-section" style="display:none;">
        <h3>SEG Layout</h3>
        <button type="button" class="layout-btn" data-seg-layout="searl" id="btn-layout-searl">Searl 10/25/35</button>
        <button type="button" class="layout-btn" data-seg-layout="roschin" id="btn-layout-roschin">Roschin–Godin 12</button>
        <button type="button" class="layout-btn" data-seg-layout="legacy" id="btn-layout-legacy">Legacy 8/12/16</button>
        <div id="seg-layout-info" style="font-size:0.68rem;color:#0aa;margin-top:6px;line-height:1.4;"></div>
      </div>

      <!-- Heron's Fountain build shape -->
      <div class="panel-section" id="heron-layout-section" style="display:none;">
        <h3>Heron Build Shape</h3>
        <button type="button" class="layout-btn" data-heron-layout="classic" id="btn-heron-classic">Classic Stack</button>
        <button type="button" class="layout-btn" data-heron-layout="compact" id="btn-heron-compact">Compact Bench</button>
        <button type="button" class="layout-btn" data-heron-layout="tower" id="btn-heron-tower">Tall Tower</button>
        <button type="button" class="layout-btn" data-heron-layout="wide" id="btn-heron-wide">Wide Museum</button>
        <button type="button" class="layout-btn" data-heron-layout="spiral" id="btn-heron-spiral">Spiral Jet</button>
        <div id="heron-layout-info" style="font-size:0.68rem;color:#0aa;margin-top:6px;line-height:1.4;"></div>
      </div>

      <!-- Particle count -->
      <div class="panel-section">
        <h3>Rendering</h3>
        <div class="slider-row">
          <label>Particles <span id="particleVal">10000</span></label>
          <input type="range" id="particleSlider" min="1000" max="50000" step="1000" value="10000">
        </div>
        <div style="margin-top: 8px;">
          <label style="display: flex; align-items: center; cursor: pointer; font-size: 0.72rem; color: #0aa;">
            <input type="checkbox" id="anomalyToggle" style="margin-right: 8px;">
            <span>Anomalous Effects</span>
          </label>
        </div>
      </div>

      <!-- About this unit -->
      <div class="panel-section">
        <h3>About This Unit</h3>
        <div id="info" style="font-size:0.72rem;color:#0aa;line-height:1.5;">
          3 concentric rings of 12/22/32 magnetic rollers with alternating copper/neodymium pole bands orbiting around central stator rings.
        </div>
        <button type="button" class="seg-op-about-toggle" id="segAboutToggle">Reference specs ▸</button>
        <div class="seg-op-about" id="seg-op-about">
          <dl>
            <dt>B<sub>surface</sub> (ref)</dt><dd>0.705 T</dd>
            <dt>Claimed RPM</dt><dd>~2850 inner</dd>
            <dt>Rollers (Searl)</dt><dd>10 / 25 / 35</dd>
            <dt>NdFeB B<sub>r</sub></dt><dd>1.48 T</dd>
          </dl>
          <p style="margin:6px 0 0;font-size:0.55rem;color:#5a7a8a;">
            <span class="seg-src-badge spec">SPEC</span> = literature reference ·
            <span class="seg-src-badge sim">SIM</span> = live simulation model
          </p>
        </div>
      </div>

      <!-- SEG Learning / tour -->
      <div class="panel-section" id="seg-explainer-section">
        <h3>SEG Learning</h3>
        <div class="ctrl-row" style="flex-wrap:wrap;gap:4px;">
          <button class="ctrl-btn" id="explainerTourBtn" type="button" style="font-size:0.68rem;">▶ Guided Tour</button>
          <button class="ctrl-btn" id="explainerVdgTourBtn" type="button" style="font-size:0.68rem;">▶ Van de Graaff Tour</button>
          <button class="ctrl-btn" id="explainerShareBtn" type="button" style="font-size:0.68rem;">⎘ Lab Link</button>
        </div>
        <div class="slider-row">
          <label>B-field experiment <span id="explainerBMultVal">×1.0</span></label>
          <input type="range" id="explainerBMult" min="0.5" max="2" step="0.1" value="1" aria-label="B-field multiplier experiment">
        </div>
        <div class="ctrl-row" style="flex-wrap:wrap;gap:4px;margin-top:4px;">
          <button class="ctrl-btn" id="explainerLayoutSearl" type="button" style="font-size:0.65rem;">Searl 10/25/35</button>
          <button class="ctrl-btn" id="explainerLayoutRoschin" type="button" style="font-size:0.65rem;">Roschin 12</button>
        </div>
        <label style="display:flex;align-items:center;cursor:pointer;font-size:0.68rem;color:#0aa;margin-top:8px;">
          <input type="checkbox" id="explainerClassroom" style="margin-right:6px;">
          Classroom mode (large labels)
        </label>
        <label style="display:flex;align-items:center;cursor:pointer;font-size:0.68rem;color:#0aa;margin-top:4px;">
          <input type="checkbox" id="explainerReducedMotion" style="margin-right:6px;">
          Reduced motion
        </label>
        <dl id="explainerGlossary" class="seg-explainer-glossary"></dl>
        <div id="explainerStatus" style="font-size:0.62rem;color:#0aa;margin-top:6px;line-height:1.4;">Arrow keys orbit · L labels · D plan view</div>
      </div>

      <!-- Telemetry export -->
      <div class="panel-section">
        <h3>Telemetry Export</h3>
        <div class="slider-row">
          <label>Sample rate <span id="telemetryHzVal">10</span> Hz</label>
          <input type="range" id="telemetrySampleHz" min="1" max="60" step="1" value="10" aria-label="Telemetry sample rate">
        </div>
        <div class="slider-row">
          <label>RNG seed <input type="number" id="telemetrySeed" placeholder="optional" style="width:72px;margin-left:6px;background:#07101a;border:1px solid #0ff3;color:#0cc;font-size:0.68rem;"></label>
        </div>
        <div class="ctrl-row" style="flex-wrap:wrap;gap:4px;">
          <button class="ctrl-btn" id="telemetryRecordBtn" type="button" style="font-size:0.68rem;">● Record 10s</button>
          <button class="ctrl-btn" id="telemetryCsvBtn" type="button" style="font-size:0.68rem;">CSV</button>
          <button class="ctrl-btn" id="telemetryJsonBtn" type="button" style="font-size:0.68rem;">JSON</button>
        </div>
        <div class="ctrl-row" style="flex-wrap:wrap;gap:4px;margin-top:4px;">
          <button class="ctrl-btn" id="telemetryOfflineBtn" type="button" style="font-size:0.68rem;">WASM 10s</button>
          <button class="ctrl-btn" id="telemetryReplayBtn" type="button" style="font-size:0.68rem;">Replay</button>
          <button class="ctrl-btn" id="telemetryBenchExportBtn" type="button" style="font-size:0.68rem;">Bench</button>
        </div>
        <label style="display:block;font-size:0.65rem;color:#0aa;margin-top:6px;">
          Load replay <input type="file" id="telemetryReplayFile" accept=".json,.csv,application/json,text/csv" style="font-size:0.6rem;color:#0aa;">
        </label>
        <div id="telemetryExportStatus" style="font-size:0.65rem;color:#0aa;margin-top:6px;line-height:1.4;">Press START, then Record 10s</div>
      </div>

      <!-- WASM demo -->
      <div class="panel-section">
        <h3>WASM Physics Core</h3>
        <div style="font-size:0.70rem;color:#0aa;margin-bottom:6px;" id="wasm-info">
          C++ sim_core compiled to WebAssembly — CPU-side RK4 integrator &amp; magnetic field solver.
        </div>
        <div class="ctrl-row">
          <button class="ctrl-btn" id="wasmBenchBtn" style="font-size:0.70rem;">⚡ Benchmark</button>
        </div>
        <div id="wasm-results">
          <div>Version: <span id="wasm-version" style="color:#0ff;">—</span></div>
          <div>Steps/s: <span id="wasm-sps"     style="color:#0ff;">—</span></div>
          <div>Final RPM: <span id="wasm-rpm"   style="color:#0ff;">—</span></div>
          <div>Ω: <span id="wasm-omega"          style="color:#0ff;">—</span> rad/s</div>
        </div>
      </div>

    </div>

    <!-- 3D Canvas -->
    <div id="canvas-wrapper">
      <canvas id="gpuCanvas"></canvas>
      <div class="corner-label" id="corner-tl">SEG WebGPU v2.0</div>
      <div class="corner-label" id="corner-tr">Drag orbit · Scroll zoom · L labels · D plan</div>
      <div class="corner-label" id="corner-bl">Mode: <span id="modeLabel">SEG</span></div>
      <div id="seg-schematic-overlay" role="dialog" aria-label="SEG cross-section schematic">
        <div class="seg-schematic-title">SEG Cross-Section</div>
        <div class="seg-schematic-svg"></div>
        <span>Stator hub · three roller rings · pole-banded NdFeB/Cu rollers</span>
      </div>
      <div id="replay-bar" hidden class="sci-panel" style="position:absolute;width:auto;max-height:none;top:auto;right:auto;overflow:visible;" role="region" aria-label="Telemetry replay scrubber" aria-hidden="true">
        <div class="replay-bar-row">
          <span class="replay-bar-title sci-panel-title" style="padding:0;letter-spacing:1.4px;">Replay</span>
          <span id="replayFileName">No file</span>
          <button type="button" class="sci-panel-btn ctrl-btn" id="replayOpenBtn" title="Open replay JSON or CSV">Open</button>
          <button type="button" class="sci-panel-btn ctrl-btn" id="replayPlayBtn" title="Play replay" disabled>▶</button>
          <button type="button" class="sci-panel-btn ctrl-btn" id="replayStepBtn" title="Step one sample" disabled>⇥</button>
          <button type="button" class="sci-panel-btn ctrl-btn" id="replayExitBtn" title="Exit replay mode" disabled>×</button>
          <input type="file" id="replayFileInput" accept=".json,.csv,application/json,text/csv" hidden>
        </div>
        <div class="replay-bar-row">
          <input type="range" id="replayScrub" min="0" max="1" step="0.001" value="0" disabled aria-label="Replay time">
          <span id="replayTime">— / —</span>
        </div>
        <div id="replayStatus">Load a .seg-replay.json or telemetry CSV</div>
      </div>
      <!-- Tachometer: shows current simulation speed multiplier -->
      <div id="tachometer">
        <div class="tach-title">Sim Speed</div>
        <div class="tach-track">
          <div class="tach-fill"></div>
        </div>
        <div class="tach-label">1.00×</div>
      </div>
    </div>

    <!-- Right telemetry panel -->
    <div id="right-panel">
      <button type="button" class="seg-panel-collapse-btn" id="collapse-right" title="Collapse instrumentation" aria-label="Collapse instrumentation">›</button>

      <div class="seg-op-unit-id">UNIT <strong>SEG-α</strong> · TEST BENCH <strong>TB-01</strong></div>

      <!-- RPM gauge -->
      <div class="reading-card">
        <div class="reading-label">Inner Ring Speed <span class="seg-src-badge sim">SIM</span></div>
        <div class="seg-rpm-gauge-wrap">
          <div id="seg-rpm-gauge"></div>
          <div class="seg-rpm-digital">
            <div class="rpm-num" id="rpm-inner">0</div>
            <div class="rpm-lbl">RPM</div>
          </div>
        </div>
      </div>

      <!-- Efficiency -->
      <div class="reading-card">
        <div class="reading-label">Conversion Efficiency <span class="seg-src-badge sim">SIM</span></div>
        <div class="reading-value" id="efficiency">0.0%</div>
        <div class="mini-bar"><div class="mini-bar-fill" id="efficiency-bar" style="width:0%"></div></div>
      </div>

      <div class="telem-section">Electrical Output</div>

      <div class="seg-led-readout">
        <div class="seg-led-cell">
          <div class="seg-led-label">Voltage <span class="seg-src-badge sim">SIM</span></div>
          <div class="seg-led-value" id="voltage">0.00 V</div>
        </div>
        <div class="seg-led-cell">
          <div class="seg-led-label">Current <span class="seg-src-badge sim">SIM</span></div>
          <div class="seg-led-value" id="current">0.000 A</div>
        </div>
        <div class="seg-led-cell full-width">
          <div class="seg-led-label">Power <span class="seg-src-badge sim">SIM</span></div>
          <div class="seg-led-value" id="power">0.0 W</div>
        </div>
      </div>

      <div class="telem-section">Physical</div>

      <div class="seg-led-readout">
        <div class="seg-led-cell">
          <div class="seg-led-label">B-Field <span class="seg-src-badge sim">SIM</span></div>
          <div class="seg-led-value" id="magnetic-field">0.000 T</div>
        </div>
        <div class="seg-led-cell">
          <div class="seg-led-label">Corona <span class="seg-src-badge sim">SIM</span></div>
          <div class="seg-led-value" id="seg-corona-val">0%</div>
        </div>
      </div>

      <div class="reading-card">
        <div class="reading-label">Thermal Load <span class="seg-src-badge sim">SIM</span></div>
        <div class="seg-led-value" id="seg-thermal-val">25.0 °C</div>
        <div class="seg-thermal-bar"><div class="seg-thermal-fill" id="seg-thermal-fill"></div></div>
        <div class="reading-value" id="temperature" style="display:none">25.0 °C</div>
      </div>

      <div class="telem-section">Energy</div>

      <div class="reading-card">
        <div class="reading-label">Integrated Output <span class="seg-src-badge sim">SIM</span></div>
        <div class="reading-value" id="energy">0.0000 kWh</div>
      </div>

    </div>
  </div>

  <!-- ── Footer ─────────────────────────────────────────── -->
  <div id="energyNetworkDisclaimer" aria-live="polite">
    Energy pipes: visual only — glow is not measured watts
  </div>
  <div id="footer">
    <span id="stats">Mode: <span id="modeFooter">SEG</span></span>
    <span>WebGPU Compute Shader Physics</span>
    <span>Battery: <span id="batteryFooter">--</span></span>
    <span id="pulse-coil-scope-wrap" style="display:none;margin-left:12px;vertical-align:middle;">
      <canvas id="pulse-coil-scope" width="200" height="40" title="Pulse-coil I (orange) / Vcap (cyan)" style="vertical-align:middle;border:1px solid #234;border-radius:2px;"></canvas>
    </span>
  </div>

  <script>
    // Multi-device camera focus: snap view to a specific device
    window.focusDevice = (deviceId) => {
      if (window.multiVisualizer && window.multiVisualizer.cameraController) {
        window.multiVisualizer.cameraController.focusOnDevice(deviceId);
      }
    };

    // Multi-device toggle: show/hide a device in the overview
    window.toggleDevice = (deviceId) => {
      if (window.multiVisualizer) {
        const enabled = window.multiVisualizer.devicesEnabled;
        if (enabled && deviceId in enabled) {
          enabled[deviceId] = !enabled[deviceId];
          const btn = document.getElementById('toggle-' + deviceId);
          if (btn) btn.classList.toggle('active', enabled[deviceId]);
        }
      }
    };
  </script>
</body>
</html>