<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      width: 100%;
      height: 100%;
      background: #ffffff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e293b;
      user-select: none;
      -webkit-user-select: none;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 8px 12px 6px;
      overflow: hidden;
    }

    .controls {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      justify-content: center;
      width: 100%;
      z-index: 10;
    }

    .pill-btn {
      appearance: none;
      border: 1.5px solid #cbd5e1;
      background: #f8fafc;
      color: #475569;
      font-size: 11px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 9999px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 5px;
      transition: all 0.2s ease;
    }

    .pill-btn .indicator {
      width: 8px;
      height: 8px;
      border-radius: 50%;
    }

    .pill-btn.active-chla {
      background: #f0fdf4;
      border-color: #15803d;
      color: #15803d;
    }
    .pill-btn.active-chlb {
      background: #f7fee7;
      border-color: #65a30d;
      color: #4d7c0f;
    }
    .pill-btn.active-carot {
      background: #fff7ed;
      border-color: #ea580c;
      color: #c2410c;
    }
    .pill-btn.active-green {
      background: #ecfdf5;
      border-color: #059669;
      color: #047857;
      box-shadow: 0 0 0 1px #059669;
    }

    .graph-container {
      width: 100%;
      flex-grow: 1;
      position: relative;
      touch-action: none;
      cursor: crosshair;
    }

    svg {
      width: 100%;
      height: 100%;
      display: block;
    }

    .readout-card {
      display: flex;
      align-items: center;
      justify-content: space-around;
      width: 100%;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 4px 8px;
      font-size: 11px;
      color: #334155;
    }

    .readout-item {
      display: flex;
      align-items: center;
      gap: 4px;
      font-weight: 600;
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <button class="pill-btn active-chla" id="btn-chla" onclick="togglePigment('chla')">
      <span class="indicator" style="background:#15803d"></span>Chl a
    </button>
    <button class="pill-btn active-chlb" id="btn-chlb" onclick="togglePigment('chlb')">
      <span class="indicator" style="background:#65a30d"></span>Chl b
    </button>
    <button class="pill-btn active-carot" id="btn-carot" onclick="togglePigment('carot')">
      <span class="indicator" style="background:#ea580c"></span>Carotenoids
    </button>
    <button class="pill-btn" id="btn-green" onclick="toggleGreenZone()">
      🌿 Green Reflection (500–550nm)
    </button>
  </div>

  
  <div class="graph-container" id="chartArea">
    <svg viewBox="0 0 600 380" preserveAspectRatio="none" id="svgChart">
      <defs>
        
        <linearGradient id="visSpectrum" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#4c1d95" />   
          <stop offset="13.5%" stop-color="#2563eb" /> 
          <stop offset="29.7%" stop-color="#06b6d4" /> 
          <stop offset="40.5%" stop-color="#22c55e" /> 
          <stop offset="54.0%" stop-color="#eab308" /> 
          <stop offset="64.8%" stop-color="#f97316" /> 
          <stop offset="75.6%" stop-color="#dc2626" /> 
          <stop offset="100%" stop-color="#7f1d1d" />  
        </linearGradient>

        <filter id="softGlow" x="-20%" y="-20%" width="140%" height="140%">
          <feDropShadow dx="0" dy="1" stdDeviation="1" flood-opacity="0.15" />
        </filter>
      </defs>

      
      
      <g stroke="#f1f5f9" stroke-width="1.5">
        <line x1="45" y1="25" x2="575" y2="25" />
        <line x1="45" y1="100" x2="575" y2="100" />
        <line x1="45" y1="175" x2="575" y2="175" />
        <line x1="45" y1="250" x2="575" y2="250" />
        <line x1="45" y1="325" x2="575" y2="325" stroke="#cbd5e1" />
      </g>

      
      <g font-size="11" fill="#64748b" text-anchor="end" font-weight="500">
        <text x="38" y="29">100%</text>
        <text x="38" y="104">75%</text>
        <text x="38" y="179">50%</text>
        <text x="38" y="254">25%</text>
        <text x="38" y="329">0%</text>
      </g>
      <text transform="rotate(-90)" x="-175" y="14" fill="#475569" font-size="11" font-weight="700" text-anchor="middle">Light Absorption (%)</text>

      
      <g id="greenZone" opacity="0" style="transition: opacity 0.3s ease;">
        <rect x="216.7" y="25" width="71.6" height="300" fill="#22c55e" fill-opacity="0.12" stroke="#16a34a" stroke-width="1.5" stroke-dasharray="4,4" />
        
        <g transform="translate(252.5, 90)">
          <rect x="-65" y="-30" width="130" height="50" rx="8" fill="#ffffff" stroke="#10b981" stroke-width="1.5" filter="url(#softGlow)" />
          <text x="0" y="-12" fill="#047857" font-size="12" font-weight="700" text-anchor="middle">🌿 Reflected Light</text>
          <text x="0" y="4" fill="#065f46" font-size="9" text-anchor="middle">500–550 nm Unabsorbed</text>
          <text x="0" y="14" fill="#065f46" font-size="9" font-weight="600" text-anchor="middle">Transmitted to Eyes</text>
        </g>
      </g>

      
      <path id="path-chla" fill="none" stroke="#15803d" stroke-width="3" stroke-linecap="round" stroke-linejoin="round" />
      <path id="path-chlb" fill="none" stroke="#65a30d" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" />
      <path id="path-carot" fill="none" stroke="#ea580c" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" />

      
      <rect x="45" y="335" width="530" height="14" rx="4" fill="url(#visSpectrum)" />

      
      <g font-size="10" fill="#64748b" text-anchor="middle" font-weight="600">
        
        <text x="73.6" y="364">400</text>
        <text x="145.3" y="364">450</text>
        <text x="216.9" y="364">500</text>
        <text x="288.5" y="364">550</text>
        <text x="360.1" y="364">600</text>
        <text x="431.8" y="364">650</text>
        <text x="503.4" y="364">700</text>
        <text x="575.0" y="364">750 nm</text>
      </g>

      
      <g id="scrubberGroup" transform="translate(116.6, 0)">
        <line x1="0" y1="25" x2="0" y2="349" stroke="#0f172a" stroke-width="1.5" stroke-dasharray="3,3" />
        <circle id="dot-chla" cx="0" cy="50" r="4.5" fill="#15803d" stroke="#ffffff" stroke-width="1.5" />
        <circle id="dot-chlb" cx="0" cy="180" r="4" fill="#65a30d" stroke="#ffffff" stroke-width="1.5" />
        <circle id="dot-carot" cx="0" cy="120" r="4" fill="#ea580c" stroke="#ffffff" stroke-width="1.5" />
      </g>
    </svg>
  </div>

  
  <div class="readout-card">
    <div class="readout-item" style="color:#0f172a">
      <span id="readout-wl" style="font-weight:700">430 nm (Blue)</span>
    </div>
    <div class="readout-item" id="ro-chla-wrap" style="color:#15803d">
      <span>Chl a:</span> <span id="val-chla">95%</span>
    </div>
    <div class="readout-item" id="ro-chlb-wrap" style="color:#4d7c0f">
      <span>Chl b:</span> <span id="val-chlb">42%</span>
    </div>
    <div class="readout-item" id="ro-carot-wrap" style="color:#c2410c">
      <span>Carot:</span> <span id="val-carot">35%</span>
    </div>
  </div>

  <script>
    // Mathematical Absorption Models (380 - 750 nm)
    function g(x, mu, sig, amp) {
      return amp * Math.exp(-0.5 * Math.pow((x - mu) / sig, 2));
    }

    function getChlA(wl) {
      if (wl < 380 || wl > 750) return 0;
      let v = g(wl, 430, 16, 95) + g(wl, 412, 10, 38) + g(wl, 662, 14, 82) + g(wl, 615, 18, 14) + g(wl, 580, 20, 5);
      return Math.min(100, Math.max(0, v));
    }

    function getChlB(wl) {
      if (wl < 380 || wl > 750) return 0;
      let v = g(wl, 455, 17, 96) + g(wl, 470, 12, 45) + g(wl, 644, 13, 58) + g(wl, 595, 16, 12) + g(wl, 425, 14, 25);
      return Math.min(100, Math.max(0, v));
    }

    function getCarot(wl) {
      if (wl < 380 || wl > 550) return 0;
      let v = g(wl, 448, 11, 84) + g(wl, 472, 10, 88) + g(wl, 425, 12, 48) + g(wl, 495, 9, 62);
      return Math.min(100, Math.max(0, v));
    }

    // Coordinate conversions
    const X_MIN = 45, X_MAX = 575, WL_MIN = 380, WL_MAX = 750;
    const Y_TOP = 25, Y_BOT = 325;

    function wlToX(wl) {
      return X_MIN + ((wl - WL_MIN) / (WL_MAX - WL_MIN)) * (X_MAX - X_MIN);
    }
    function xToWl(x) {
      return WL_MIN + ((x - X_MIN) / (X_MAX - X_MIN)) * (WL_MAX - WL_MIN);
    }
    function absToY(pct) {
      return Y_BOT - (pct / 100) * (Y_BOT - Y_TOP);
    }

    // Build SVG Paths
    function buildPaths() {
      let dChlA = '', dChlB = '', dCarot = '';
      for (let wl = 380; wl <= 750; wl += 1) {
        const x = wlToX(wl).toFixed(1);
        const yA = absToY(getChlA(wl)).toFixed(1);
        const yB = absToY(getChlB(wl)).toFixed(1);
        const yC = absToY(getCarot(wl)).toFixed(1);
        const cmd = wl === 380 ? 'M' : 'L';
        dChlA += `${cmd} ${x} ${yA} `;
        dChlB += `${cmd} ${x} ${yB} `;
        dCarot += `${cmd} ${x} ${yC} `;
      }
      document.getElementById('path-chla').setAttribute('d', dChlA);
      document.getElementById('path-chlb').setAttribute('d', dChlB);
      document.getElementById('path-carot').setAttribute('d', dCarot);
    }
    buildPaths();

    // State
    const state = {
      chla: true,
      chlb: true,
      carot: true,
      greenZone: false,
      currentWl: 430
    };

    function togglePigment(type) {
      state[type] = !state[type];
      const btn = document.getElementById(`btn-${type}`);
      const path = document.getElementById(`path-${type}`);
      const dot = document.getElementById(`dot-${type}`);
      const roWrap = document.getElementById(`ro-${type}-wrap`);

      if (state[type]) {
        btn.classList.add(`active-${type}`);
        path.style.display = '';
        dot.style.display = '';
        roWrap.style.opacity = '1';
      } else {
        btn.classList.remove(`active-${type}`);
        path.style.display = 'none';
        dot.style.display = 'none';
        roWrap.style.opacity = '0.3';
      }
    }

    function toggleGreenZone() {
      state.greenZone = !state.greenZone;
      const gz = document.getElementById('greenZone');
      const btn = document.getElementById('btn-green');
      gz.style.opacity = state.greenZone ? '1' : '0';
      if (state.greenZone) {
        btn.classList.add('active-green');
        updateScrubber(525);
      } else {
        btn.classList.remove('active-green');
      }
    }

    function getWlColorName(wl) {
      if (wl < 430) return 'Violet';
      if (wl < 490) return 'Blue';
      if (wl < 510) return 'Cyan';
      if (wl < 565) return 'Green';
      if (wl < 590) return 'Yellow';
      if (wl < 625) return 'Orange';
      return 'Red';
    }

    function updateScrubber(wl) {
      wl = Math.max(380, Math.min(750, Math.round(wl)));
      state.currentWl = wl;
      const x = wlToX(wl);

      document.getElementById('scrubberGroup').setAttribute('transform', `translate(${x}, 0)`);

      const aA = getChlA(wl);
      const aB = getChlB(wl);
      const aC = getCarot(wl);

      document.getElementById('dot-chla').setAttribute('cy', absToY(aA));
      document.getElementById('dot-chlb').setAttribute('cy', absToY(aB));
      document.getElementById('dot-carot').setAttribute('cy', absToY(aC));

      document.getElementById('readout-wl').textContent = `${wl} nm (${getWlColorName(wl)})`;
      document.getElementById('val-chla').textContent = `${Math.round(aA)}%`;
      document.getElementById('val-chlb').textContent = `${Math.round(aB)}%`;
      document.getElementById('val-carot').textContent = `${Math.round(aC)}%`;
    }

    // Pointer Interaction
    const chartArea = document.getElementById('chartArea');
    function handlePointer(e) {
      const rect = chartArea.getBoundingClientRect();
      const clientX = e.clientX || (e.touches && e.touches[0] ? e.touches[0].clientX : 0);
      const relX = (clientX - rect.left) / rect.width;
      const svgX = relX * 600;
      const wl = xToWl(svgX);
      updateScrubber(wl);
    }

    let isInteracting = false;
    chartArea.addEventListener('pointerdown', (e) => {
      isInteracting = true;
      chartArea.setPointerCapture(e.pointerId);
      handlePointer(e);
    });
    chartArea.addEventListener('pointermove', (e) => {
      if (isInteracting || e.pointerType === 'mouse') {
        handlePointer(e);
      }
    });
    chartArea.addEventListener('pointerup', (e) => {
      isInteracting = false;
    });

    // Initialize at primary Chl a peak
    updateScrubber(430);
  </script>
</body>
</html>

Chloroplast Ultrastructure and Photosynthetic Pigments

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      color: #1e2945;
      background: #ffffff;
      padding: 10px;
      user-select: none;
      -webkit-user-select: none;
    }
    .main-wrap {
      display: flex;
      flex-direction: column;
      gap: 8px;
      max-width: 600px;
      margin: 0 auto;
    }
    .panel-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
    }
    .readout {
      background: #f1f5f9;
      padding: 2px 8px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 700;
      color: #0f172a;
    }
    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }
    .slider-row {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-top: 2px;
    }
    .slider-row input[type="range"] {
      flex: 1;
      height: 6px;
      accent-color: #2563eb;
      cursor: pointer;
    }
    .legend {
      display: flex;
      justify-content: center;
      gap: 16px;
      font-size: 11px;
      font-weight: 600;
    }
    .legend-item {
      display: flex;
      align-items: center;
      gap: 5px;
    }
    .legend-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .legend-line {
      width: 16px;
      height: 3px;
      border-radius: 2px;
    }
  </style>
</head>
<body>
  <div class="main-wrap">
    
    <div class="panel-header">
      <span>Engelmann (1883)</span>
      <span class="readout" id="readout">430 nm · High O₂</span>
    </div>

    
    <svg id="diagram" viewBox="0 0 500 320" xmlns="http://www.w3.org/2000/svg">
      <defs>
        
        <linearGradient id="spectrum" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#4c1d95" />
          <stop offset="10%" stop-color="#2563eb" />
          <stop offset="25%" stop-color="#06b6d4" />
          <stop offset="45%" stop-color="#22c55e" />
          <stop offset="65%" stop-color="#eab308" />
          <stop offset="80%" stop-color="#f97316" />
          <stop offset="100%" stop-color="#ef4444" />
        </linearGradient>

        
        <pattern id="spiral" width="30" height="24" patternUnits="userSpaceOnUse">
          <path d="M 0,20 Q 15,4 30,20" fill="none" stroke="#15803d" stroke-width="4" stroke-linecap="round" />
        </pattern>
      </defs>

      
      
      <rect x="40" y="8" width="440" height="110" fill="url(#spectrum)" opacity="0.18" rx="6" />

      
      <rect x="40" y="52" width="440" height="22" rx="4" fill="#86efac" stroke="#16a34a" stroke-width="1.5" />
      <rect x="40" y="52" width="440" height="22" fill="url(#spiral)" rx="4" opacity="0.8" />
      
      
      <g stroke="#166534" stroke-width="1.5" opacity="0.5">
        <line x1="113" y1="52" x2="113" y2="74" />
        <line x1="186" y1="52" x2="186" y2="74" />
        <line x1="260" y1="52" x2="260" y2="74" />
        <line x1="333" y1="52" x2="333" y2="74" />
        <line x1="406" y1="52" x2="406" y2="74" />
      </g>
      <text x="44" y="67" font-size="9" fill="#14532d" font-weight="700">Spirogyra alga</text>

      
      <g id="bacteriaGroup"></g>

      
      <rect x="40" y="122" width="440" height="8" fill="url(#spectrum)" rx="3" />

      
      
      <g stroke="#f1f5f9" stroke-width="1">
        <line x1="40" y1="170" x2="480" y2="170" />
        <line x1="40" y1="220" x2="480" y2="220" />
        <line x1="40" y1="270" x2="480" y2="270" />
      </g>

      
      <line x1="40" y1="270" x2="480" y2="270" stroke="#cbd5e1" stroke-width="1.5" />
      <line x1="40" y1="145" x2="40" y2="270" stroke="#cbd5e1" stroke-width="1.5" />

      
      <g font-size="10" fill="#64748b" text-anchor="middle">
        <text x="40" y="285">400</text>
        <text x="113" y="285">450</text>
        <text x="186" y="285">500</text>
        <text x="260" y="285">550</text>
        <text x="333" y="285">600</text>
        <text x="406" y="285">650</text>
        <text x="480" y="285">700 nm</text>
      </g>

      
      <path id="absorptionPath" fill="none" stroke="#2563eb" stroke-width="2.5" stroke-linecap="round" />
      <path id="actionPath" fill="none" stroke="#dc2626" stroke-width="2" stroke-dasharray="4 3" stroke-linecap="round" />

      
      <g id="trackerGroup" transform="translate(84, 0)">
        <line x1="0" y1="10" x2="0" y2="270" stroke="#0f172a" stroke-width="1.5" stroke-dasharray="2 2" />
        <circle id="trackAbsorption" cx="0" cy="155" r="4.5" fill="#2563eb" stroke="#ffffff" stroke-width="1.5" />
        <circle id="trackAction" cx="0" cy="160" r="4.5" fill="#dc2626" stroke="#ffffff" stroke-width="1.5" />
      </g>
    </svg>

    
    <div class="legend">
      <div class="legend-item">
        <div class="legend-dot" style="background:#8b5cf6;"></div>
        <span>Bacteria (O₂ density)</span>
      </div>
      <div class="legend-item">
        <div class="legend-line" style="background:#2563eb;"></div>
        <span>Absorption</span>
      </div>
      <div class="legend-item">
        <div class="legend-line" style="background:#dc2626; border-top: 1px dashed #dc2626; height:1px;"></div>
        <span>Action (Photosynthesis)</span>
      </div>
    </div>

    
    <div class="slider-row">
      <input type="range" id="waveSlider" min="400" max="700" value="430" step="1">
    </div>
  </div>

  <script>
    // Mathematical functions for accurate spectra (400nm - 700nm)
    function getPhotosyntheticRate(wl) {
      // Gaussian peaks at ~430nm (blue) and ~665nm (red), valley at ~550nm
      const bluePeak = 0.92 * Math.exp(-Math.pow((wl - 430) / 28, 2));
      const redPeak = 0.78 * Math.exp(-Math.pow((wl - 665) / 22, 2));
      const carotenoidShoulder = 0.45 * Math.exp(-Math.pow((wl - 475) / 25, 2));
      const baseline = 0.04;
      return Math.min(1, bluePeak + redPeak + carotenoidShoulder + baseline);
    }

    function getAbsorptionRate(wl) {
      // Chlorophyll a/b combined absorption
      const bluePeak = 0.98 * Math.exp(-Math.pow((wl - 425) / 24, 2));
      const bluePeak2 = 0.65 * Math.exp(-Math.pow((wl - 460) / 20, 2));
      const redPeak = 0.72 * Math.exp(-Math.pow((wl - 660) / 20, 2));
      const baseline = 0.02;
      return Math.min(1, bluePeak + bluePeak2 + redPeak + baseline);
    }

    const svgXMin = 40, svgXMax = 480;
    const svgYBaseline = 270, svgYMaxHeight = 115;

    function wlToX(wl) {
      return svgXMin + ((wl - 400) / 300) * (svgXMax - svgXMin);
    }

    // Build SVG paths accurately
    let absD = "", actD = "";
    for (let wl = 400; wl <= 700; wl += 2) {
      const x = wlToX(wl).toFixed(1);
      const yAbs = (svgYBaseline - getAbsorptionRate(wl) * svgYMaxHeight).toFixed(1);
      const yAct = (svgYBaseline - getPhotosyntheticRate(wl) * svgYMaxHeight).toFixed(1);
      
      absD += (wl === 400 ? `M ${x} ${yAbs}` : ` L ${x} ${yAbs}`);
      actD += (wl === 400 ? `M ${x} ${yAct}` : ` L ${x} ${yAct}`);
    }
    document.getElementById('absorptionPath').setAttribute('d', absD);
    document.getElementById('actionPath').setAttribute('d', actD);

    // Seeded random pseudo-generator for consistent bacteria layout
    let seed = 42;
    function rand() {
      seed = (seed * 9301 + 49297) % 233280;
      return seed / 233280;
    }

    // Populate Aerobic Bacteria according to O2 rate
    const bacteriaGroup = document.getElementById('bacteriaGroup');
    const totalBacteria = 260;
    let placed = 0;

    while (placed < totalBacteria) {
      const wl = 400 + rand() * 300;
      const rate = getPhotosyntheticRate(wl);
      
      // Accept bacteria proportional to photosynthetic O2 rate
      if (rand() < rate * 1.1) {
        const x = wlToX(wl) + (rand() - 0.5) * 6;
        // Cluster close to the alga filament (y: 32 to 50 above, 76 to 96 below)
        const side = rand() > 0.5 ? 1 : -1;
        const spread = Math.pow(rand(), 1.5) * 22 + 4;
        const y = side === 1 ? 52 - spread : 74 + spread;

        const circle = document.createElementNS("http://www.w3.org/2000/svg", "circle");
        circle.setAttribute("cx", x.toFixed(1));
        circle.setAttribute("cy", y.toFixed(1));
        circle.setAttribute("r", (1.6 + rand() * 0.8).toFixed(1));
        circle.setAttribute("fill", "#7c3aed");
        circle.setAttribute("opacity", (0.7 + rand() * 0.3).toFixed(2));
        bacteriaGroup.appendChild(circle);
        placed++;
      }
    }

    // Interactive slider & tracking
    const slider = document.getElementById('waveSlider');
    const trackerGroup = document.getElementById('trackerGroup');
    const trackAbsorption = document.getElementById('trackAbsorption');
    const trackAction = document.getElementById('trackAction');
    const readout = document.getElementById('readout');

    function update(wl) {
      const x = wlToX(wl);
      const absY = svgYBaseline - getAbsorptionRate(wl) * svgYMaxHeight;
      const actY = svgYBaseline - getPhotosyntheticRate(wl) * svgYMaxHeight;

      trackerGroup.setAttribute('transform', `translate(${x}, 0)`);
      trackAbsorption.setAttribute('cy', absY);
      trackAction.setAttribute('cy', actY);

      let activityLabel = "Low O₂";
      const rate = getPhotosyntheticRate(wl);
      if (rate > 0.65) activityLabel = "High O₂";
      else if (rate > 0.3) activityLabel = "Moderate O₂";

      readout.textContent = `${wl} nm · ${activityLabel}`;
    }

    slider.addEventListener('input', (e) => {
      update(parseInt(e.target.value, 10));
    });

    // Touch / Click on SVG Diagram to move tracker
    const diagram = document.getElementById('diagram');
    function handlePointer(evt) {
      const rect = diagram.getBoundingClientRect();
      const clientX = evt.clientX || (evt.touches && evt.touches[0].clientX);
      if (!clientX) return;
      const pct = (clientX - (rect.left + rect.width * (40 / 500))) / (rect.width * (440 / 500));
      let wl = Math.round(400 + Math.max(0, Math.min(1, pct)) * 300);
      slider.value = wl;
      update(wl);
    }

    diagram.addEventListener('pointerdown', handlePointer);
    diagram.addEventListener('pointermove', (e) => {
      if (e.buttons === 1) handlePointer(e);
    });

    // Initial positioning
    update(430);
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Photosynthetic Action Spectrum</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e293b;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
    }

    .header-tabs {
      display: flex;
      gap: 6px;
      width: 100%;
      max-width: 580px;
      margin-bottom: 8px;
    }

    .tab-btn {
      flex: 1;
      border: 1px solid #cbd5e1;
      background: #ffffff;
      padding: 6px 4px;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 700;
      color: #64748b;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      transition: all 0.25s ease;
    }

    .tab-btn.active {
      background: #0f172a;
      color: #ffffff;
      border-color: #0f172a;
      box-shadow: 0 2px 6px rgba(15, 23, 42, 0.15);
    }

    .chambers-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
      width: 100%;
      max-width: 580px;
      flex: 1;
    }

    .chamber-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 8px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      position: relative;
      cursor: pointer;
      transition: box-shadow 0.25s ease, border-color 0.25s ease;
    }

    .chamber-card.highlight {
      border-color: #3b82f6;
      box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.25), 0 4px 12px rgba(0,0,0,0.06);
    }

    .badge-rank {
      position: absolute;
      top: 6px;
      right: 6px;
      padding: 2px 6px;
      border-radius: 12px;
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.2px;
    }

    .rank-1 { background: #dcfce7; color: #15803d; }
    .rank-2 { background: #e0f2fe; color: #0369a1; }
    .rank-3 { background: #fee2e2; color: #b91c1c; }

    .card-title {
      font-size: 13px;
      font-weight: 800;
      color: #0f172a;
      align-self: flex-start;
      line-height: 1.1;
    }

    .wavelength {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
      align-self: flex-start;
      margin-bottom: 4px;
    }

    .beam-box {
      width: 100%;
      height: 72px;
      border-radius: 8px;
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-end;
      padding-bottom: 6px;
      overflow: hidden;
      margin-bottom: 6px;
      border: 1px solid rgba(0,0,0,0.06);
    }

    .beam-a {
      background: radial-gradient(ellipse at top, rgba(34, 197, 94, 0.45), rgba(34, 197, 94, 0.05));
    }
    .beam-b {
      background: radial-gradient(ellipse at top, rgba(59, 130, 246, 0.5), rgba(59, 130, 246, 0.08));
    }
    .beam-c {
      background: linear-gradient(135deg, rgba(59, 130, 246, 0.45), rgba(239, 68, 68, 0.45));
    }

    .lamp-icon {
      position: absolute;
      top: 3px;
      font-size: 12px;
      opacity: 0.9;
    }

    .chloroplast-leaf {
      font-size: 26px;
      line-height: 1;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
      position: relative;
      z-index: 2;
    }

    .bubble {
      position: absolute;
      width: 6px;
      height: 6px;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid #38bdf8;
      border-radius: 50%;
      bottom: 22px;
      animation: rise 2s infinite linear;
    }

    @keyframes rise {
      0% { transform: translateY(0) scale(0.6); opacity: 0; }
      30% { opacity: 0.9; }
      100% { transform: translateY(-38px) scale(1.1); opacity: 0; }
    }

    .metrics {
      width: 100%;
      display: flex;
      flex-direction: column;
      gap: 5px;
    }

    .metric-row {
      width: 100%;
    }

    .metric-label {
      display: flex;
      justify-content: space-between;
      font-size: 10px;
      font-weight: 700;
      color: #475569;
      margin-bottom: 2px;
    }

    .bar-track {
      width: 100%;
      height: 7px;
      background: #e2e8f0;
      border-radius: 4px;
      overflow: hidden;
    }

    .bar-fill {
      height: 100%;
      border-radius: 4px;
      transition: width 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .fill-absorb-a { width: 5%; background: #22c55e; }
    .fill-absorb-b { width: 75%; background: #3b82f6; }
    .fill-absorb-c { width: 95%; background: #8b5cf6; }

    .fill-o2-a { width: 4%; background: #94a3b8; }
    .fill-o2-b { width: 72%; background: #0284c7; }
    .fill-o2-c { width: 98%; background: #16a34a; }

    .stepper-controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      margin-top: 8px;
    }

    .ctrl-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 4px 14px;
      font-size: 12px;
      font-weight: 700;
      color: #334155;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .dots-container {
      display: flex;
      gap: 6px;
    }

    .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      transition: background 0.2s ease;
    }

    .dot.active {
      background: #0f172a;
      transform: scale(1.15);
    }

    @media (max-width: 420px) {
      .card-title { font-size: 11px; }
      .wavelength { font-size: 9px; }
      .badge-rank { font-size: 9px; padding: 1px 4px; }
      .metric-label { font-size: 9px; }
      .beam-box { height: 58px; }
      .chloroplast-leaf { font-size: 22px; }
    }
  </style>
</head>
<body>

  <div class="header-tabs">
    <button class="tab-btn active" onclick="setStep(0)">Light A</button>
    <button class="tab-btn" onclick="setStep(1)">Light B</button>
    <button class="tab-btn" onclick="setStep(2)">Light C</button>
    <button class="tab-btn" onclick="setStep(3)">All</button>
  </div>

  <div class="chambers-grid">
    
    <div class="chamber-card" id="card-0" onclick="setStep(0)">
      <span class="badge-rank rank-3">3rd</span>
      <div class="card-title">Light A</div>
      <div class="wavelength">530 nm Green</div>
      <div class="beam-box beam-a">
        <span class="lamp-icon">🟢 530nm</span>
        <div class="chloroplast-leaf">🍃</div>
      </div>
      <div class="metrics">
        <div class="metric-row">
          <div class="metric-label"><span>Absorption</span><span>5%</span></div>
          <div class="bar-track"><div class="bar-fill fill-absorb-a"></div></div>
        </div>
        <div class="metric-row">
          <div class="metric-label"><span>O₂ Output</span><span>Lowest</span></div>
          <div class="bar-track"><div class="bar-fill fill-o2-a"></div></div>
        </div>
      </div>
    </div>

    
    <div class="chamber-card" id="card-1" onclick="setStep(1)">
      <span class="badge-rank rank-2">2nd</span>
      <div class="card-title">Light B</div>
      <div class="wavelength">450 nm Blue</div>
      <div class="beam-box beam-b">
        <span class="lamp-icon">🔵 450nm</span>
        <div class="bubble" style="left: 45%; animation-delay: 0s;"></div>
        <div class="bubble" style="left: 55%; animation-delay: 1s;"></div>
        <div class="chloroplast-leaf">🍃</div>
      </div>
      <div class="metrics">
        <div class="metric-row">
          <div class="metric-label"><span>Absorption</span><span>75%</span></div>
          <div class="bar-track"><div class="bar-fill fill-absorb-b"></div></div>
        </div>
        <div class="metric-row">
          <div class="metric-label"><span>O₂ Output</span><span>High</span></div>
          <div class="bar-track"><div class="bar-fill fill-o2-b"></div></div>
        </div>
      </div>
    </div>

    
    <div class="chamber-card" id="card-2" onclick="setStep(2)">
      <span class="badge-rank rank-1">1st ✦</span>
      <div class="card-title">Light C</div>
      <div class="wavelength">450 + 660 nm</div>
      <div class="beam-box beam-c">
        <span class="lamp-icon">🔵+🔴 Peaks</span>
        <div class="bubble" style="left: 35%; animation-delay: 0s;"></div>
        <div class="bubble" style="left: 50%; animation-delay: 0.6s;"></div>
        <div class="bubble" style="left: 65%; animation-delay: 1.2s;"></div>
        <div class="chloroplast-leaf">🍃</div>
      </div>
      <div class="metrics">
        <div class="metric-row">
          <div class="metric-label"><span>Absorption</span><span>95%</span></div>
          <div class="bar-track"><div class="bar-fill fill-absorb-c"></div></div>
        </div>
        <div class="metric-row">
          <div class="metric-label"><span>O₂ Output</span><span>Highest</span></div>
          <div class="bar-track"><div class="bar-fill fill-o2-c"></div></div>
        </div>
      </div>
    </div>
  </div>

  <div class="stepper-controls">
    <button class="ctrl-btn" id="playBtn" onclick="togglePlay()">⏸ Pause</button>
    <div class="dots-container">
      <div class="dot active" onclick="setStep(0)"></div>
      <div class="dot" onclick="setStep(1)"></div>
      <div class="dot" onclick="setStep(2)"></div>
      <div class="dot" onclick="setStep(3)"></div>
    </div>
  </div>

  <script>
    let currentStep = 0;
    let isPlaying = true;
    let timer = null;

    function render() {
      // Tabs
      const tabs = document.querySelectorAll('.tab-btn');
      tabs.forEach((tab, i) => {
        tab.classList.toggle('active', i === currentStep);
      });

      // Dots
      const dots = document.querySelectorAll('.dot');
      dots.forEach((dot, i) => {
        dot.classList.toggle('active', i === currentStep);
      });

      // Cards highlight
      for (let i = 0; i < 3; i++) {
        const card = document.getElementById(`card-${i}`);
        if (currentStep === 3) {
          card.classList.add('highlight');
          card.style.opacity = '1';
        } else if (currentStep === i) {
          card.classList.add('highlight');
          card.style.opacity = '1';
        } else {
          card.classList.remove('highlight');
          card.style.opacity = '0.55';
        }
      }
    }

    function setStep(step) {
      currentStep = step;
      render();
    }

    function nextStep() {
      currentStep = (currentStep + 1) % 4;
      render();
    }

    function togglePlay() {
      isPlaying = !isPlaying;
      const btn = document.getElementById('playBtn');
      if (isPlaying) {
        btn.textContent = '⏸ Pause';
        startTimer();
      } else {
        btn.textContent = '▶ Play';
        clearInterval(timer);
      }
    }

    function startTimer() {
      clearInterval(timer);
      timer = setInterval(() => {
        if (isPlaying) nextStep();
      }, 3200);
    }

    render();
    startTimer();
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: #ffffff;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      user-select: none;
    }

    .header-bar {
      width: 100%;
      max-width: 600px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      min-height: 32px;
      margin-bottom: 4px;
    }

    .info-pill {
      font-size: 13px;
      font-weight: 600;
      color: #0f766e;
      background: #ccfbf1;
      padding: 4px 12px;
      border-radius: 9999px;
      transition: all 0.25s ease;
      white-space: nowrap;
      text-overflow: ellipsis;
      overflow: hidden;
      max-width: 100%;
    }

    .stage-wrapper {
      position: relative;
      width: 100%;
      max-width: 560px;
      aspect-ratio: 16 / 10;
      margin: 0 auto;
    }

    svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    /* Interactive SVG Parts */
    .part {
      transition: opacity 0.3s ease, filter 0.3s ease;
      cursor: pointer;
    }
    
    .dimmed {
      opacity: 0.22 !important;
    }

    .highlighted {
      filter: drop-shadow(0 0 6px rgba(16, 185, 129, 0.9));
    }

    .highlighted-teal {
      filter: drop-shadow(0 0 8px rgba(20, 184, 166, 0.9));
    }

    .highlighted-gold {
      filter: drop-shadow(0 0 6px rgba(234, 179, 8, 0.9));
    }

    /* Button Nav */
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      justify-content: center;
      width: 100%;
      max-width: 580px;
      margin-top: 8px;
    }

    .btn {
      appearance: none;
      border: 1px solid #e2e8f0;
      background: #f8fafc;
      color: #334155;
      padding: 6px 12px;
      border-radius: 20px;
      font-size: 12.5px;
      font-weight: 600;
      cursor: pointer;
      transition: background-color 0.2s, border-color 0.2s, color 0.2s, box-shadow 0.2s;
    }

    .btn:hover, .btn:focus-visible {
      border-color: #0d9488;
      background: #f0fdfa;
      color: #0f766e;
    }

    .btn.active {
      background: #0f766e;
      border-color: #0f766e;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(15, 118, 110, 0.25);
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <div id="infoText" class="info-pill">Tap or hover structures to explore</div>
  </div>

  <div class="stage-wrapper">
    <svg viewBox="0 0 600 370" id="chloroplastSvg">
      <defs>
        
        <linearGradient id="outerGrad" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#4ade80" />
          <stop offset="60%" stop-color="#16a34a" />
          <stop offset="100%" stop-color="#15803d" />
        </linearGradient>

        
        <linearGradient id="innerGrad" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#86efac" />
          <stop offset="100%" stop-color="#22c55e" />
        </linearGradient>

        
        <radialGradient id="stromaGrad" cx="45%" cy="50%" r="55%">
          <stop offset="0%" stop-color="#ccfbf1" />
          <stop offset="70%" stop-color="#99f6e4" />
          <stop offset="100%" stop-color="#5eead4" />
        </radialGradient>

        
        <linearGradient id="discGrad" x1="0%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#34d399" />
          <stop offset="45%" stop-color="#059669" />
          <stop offset="100%" stop-color="#065f46" />
        </linearGradient>

        
        <linearGradient id="discTopGrad" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#6ee7b7" />
          <stop offset="100%" stop-color="#10b981" />
        </linearGradient>

        
        <linearGradient id="lumenGrad" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#fef08a" />
          <stop offset="100%" stop-color="#facc15" />
        </linearGradient>
      </defs>

      
      <ellipse cx="300" cy="320" rx="220" ry="32" fill="#0f172a" opacity="0.08" />

      
      <g id="grp-outer" class="part" data-part="outer">
        <path d="M 90,185 C 90,105 180,65 300,65 C 420,65 510,105 510,185 C 510,265 420,305 300,305 C 180,305 90,265 90,185 Z"
              fill="url(#outerGrad)" stroke="#166534" stroke-width="4" />
      </g>

      
      <g id="grp-space" class="part" data-part="space">
        <path d="M 104,185 C 104,115 190,78 300,78 C 410,78 496,115 496,185 C 496,255 410,292 300,292 C 190,292 104,255 104,185 Z"
              fill="#bbf7d0" stroke="#86efac" stroke-width="1.5" />
      </g>

      
      <g id="grp-inner" class="part" data-part="inner">
        <path d="M 116,185 C 116,122 198,88 300,88 C 402,88 484,122 484,185 C 484,248 402,282 300,282 C 198,282 116,248 116,185 Z"
              fill="url(#innerGrad)" stroke="#15803d" stroke-width="3" />
      </g>

      <g id="grp-stroma" class="part" data-part="stroma">
        
        <path d="M 124,185 C 124,128 202,96 300,96 C 398,96 476,128 476,185 C 476,242 398,274 300,274 C 202,274 124,242 124,185 Z"
              fill="url(#stromaGrad)" stroke="#2dd4bf" stroke-width="1.5" />
        
        
        <circle cx="210" cy="140" r="2.5" fill="#0f766e" opacity="0.6" />
        <circle cx="218" cy="144" r="2.5" fill="#0f766e" opacity="0.6" />
        <circle cx="390" cy="145" r="2.5" fill="#0f766e" opacity="0.6" />
        <circle cx="380" cy="225" r="2.5" fill="#0f766e" opacity="0.6" />
        <path d="M 270,120 Q 285,115 295,123 T 310,120" fill="none" stroke="#0d9488" stroke-width="1.5" opacity="0.5" stroke-dasharray="2,2" />
      </g>

      
      <g id="grp-lamellae" class="part" data-part="granum" opacity="0.9">
        <path d="M 215,190 C 250,185 270,210 300,205 C 330,200 360,215 390,200" fill="none" stroke="#047857" stroke-width="6" stroke-linecap="round" />
        <path d="M 215,190 C 250,185 270,210 300,205 C 330,200 360,215 390,200" fill="none" stroke="#34d399" stroke-width="2.5" stroke-linecap="round" />
        
        <path d="M 220,225 C 260,230 280,215 320,225" fill="none" stroke="#047857" stroke-width="5" stroke-linecap="round" />
        <path d="M 220,225 C 260,230 280,215 320,225" fill="none" stroke="#34d399" stroke-width="2" stroke-linecap="round" />
      </g>

      
      <g id="grp-granum-left" class="part" data-part="granum">
        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="205" cy="235" rx="36" ry="11" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
          <ellipse cx="205" cy="232" rx="36" ry="11" fill="url(#discTopGrad)" />
        </g>
        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="205" cy="221" rx="36" ry="11" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
          <ellipse cx="205" cy="218" rx="36" ry="11" fill="url(#discTopGrad)" />
        </g>
        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="205" cy="207" rx="36" ry="11" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
          <ellipse cx="205" cy="204" rx="36" ry="11" fill="url(#discTopGrad)" />
        </g>
        
        <g class="thylakoid-disc" data-part="thylakoid">
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          <ellipse cx="205" cy="190" rx="36" ry="11" fill="url(#discTopGrad)" />
        </g>
        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="205" cy="179" rx="36" ry="11" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
          <ellipse cx="205" cy="176" rx="36" ry="11" fill="url(#discTopGrad)" />
        </g>
      </g>

      
      <g id="grp-granum-right" class="part" data-part="granum">
        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="395" cy="225" rx="34" ry="10" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
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        </g>
        
        <g class="thylakoid-disc" data-part="thylakoid">
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        </g>
        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="395" cy="199" rx="34" ry="10" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
          <ellipse cx="395" cy="196" rx="34" ry="10" fill="url(#discTopGrad)" />
        </g>
        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="395" cy="186" rx="34" ry="10" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
          <ellipse cx="395" cy="183" rx="34" ry="10" fill="url(#discTopGrad)" />
        </g>
      </g>

      
      <g id="grp-granum-center" class="part" data-part="granum">
        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="300" cy="245" rx="40" ry="12" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
          <ellipse cx="300" cy="242" rx="40" ry="12" fill="url(#discTopGrad)" />
        </g>
        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="300" cy="230" rx="40" ry="12" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
          <ellipse cx="300" cy="227" rx="40" ry="12" fill="url(#discTopGrad)" />
        </g>
        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="300" cy="215" rx="40" ry="12" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
          <ellipse cx="300" cy="212" rx="40" ry="12" fill="url(#discTopGrad)" />
        </g>

        
        <g id="grp-cutaway-disc">
          
          <path d="M 260,195 A 40 12 0 0 1 340,195 Z" fill="#047857" />
          
          
          <path d="M 260,195 A 40 12 0 0 0 340,195 L 333,195 A 33 9 0 0 1 267,195 Z" 
                fill="#10b981" stroke="#047857" stroke-width="1" class="part" data-part="thylakoid" />

          
          <ellipse id="elem-lumen" cx="300" cy="195" rx="32" ry="8.5" fill="url(#lumenGrad)" 
                   stroke="#ca8a04" stroke-width="1.5" class="part" data-part="lumen" />
          
          
          <ellipse cx="300" cy="195" rx="38" ry="11" fill="none" stroke="#34d399" stroke-width="2" opacity="0.6" />
        </g>

        
        <g class="thylakoid-disc" data-part="thylakoid">
          <ellipse cx="300" cy="180" rx="38" ry="11" fill="url(#discGrad)" stroke="#065f46" stroke-width="1" />
          <ellipse cx="300" cy="177" rx="38" ry="11" fill="url(#discTopGrad)" />
        </g>
      </g>

      
      <g id="badge-light" opacity="0" style="transition: opacity 0.3s ease;">
        <path d="M 170,80 L 195,145" stroke="#f59e0b" stroke-width="3" stroke-dasharray="4,3" marker-end="url(#arrow)" />
        <text x="160" y="70" font-size="12" font-weight="bold" fill="#d97706">☀️ Light</text>
      </g>

      
      <g id="labels-layer" font-size="12" font-weight="600" fill="#1e2945" pointer-events="none">
        
        <path id="ptr-outer" d="M 440,75 L 470,60 L 510,60" fill="none" stroke="#15803d" stroke-width="1.5" opacity="0" />
        
        <path id="ptr-stroma" d="M 230,125 L 170,105 L 120,105" fill="none" stroke="#0d9488" stroke-width="1.5" opacity="0" />
        
        <path id="ptr-granum" d="M 395,175 L 450,150 L 500,150" fill="none" stroke="#047857" stroke-width="1.5" opacity="0" />
      </g>
    </svg>
  </div>

  
  <div class="btn-group" role="tablist">
    <button class="btn active" data-target="all">Overview</button>
    <button class="btn" data-target="outer">Outer Membrane</button>
    <button class="btn" data-target="inner">Inner Membrane</button>
    <button class="btn" data-target="stroma">Stroma</button>
    <button class="btn" data-target="granum">Granum</button>
    <button class="btn" data-target="thylakoid">Thylakoid Membrane</button>
    <button class="btn" data-target="lumen">Lumen</button>
  </div>

  <script>
    const infoData = {
      all: "Chloroplast: Solar power plant of the cell",
      outer: "Outer Membrane: Permeable protective outer boundary",
      space: "Intermembrane Space: Space between lipid bilayers",
      inner: "Inner Membrane: Highly selective transport barrier",
      stroma: "Stroma: Site of Calvin Cycle (Sugar Synthesis)",
      granum: "Granum: Stack of light-trapping thylakoid discs",
      thylakoid: "Thylakoid Membrane: Houses Pigments & Light Reactions",
      lumen: "Thylakoid Lumen: Proton reservoir for ATP synthesis"
    };

    const infoText = document.getElementById('infoText');
    const buttons = document.querySelectorAll('.btn');
    const parts = document.querySelectorAll('.part');

    function highlightPart(targetKey) {
      // Update Info pill
      infoText.textContent = infoData[targetKey] || infoData.all;
      
      // Update button active states
      buttons.forEach(b => {
        if (b.dataset.target === targetKey) {
          b.classList.add('active');
        } else {
          b.classList.remove('active');
        }
      });

      if (targetKey === 'all') {
        parts.forEach(el => {
          el.classList.remove('dimmed', 'highlighted', 'highlighted-teal', 'highlighted-gold');
        });
        return;
      }

      parts.forEach(el => {
        const p = el.getAttribute('data-part');
        el.classList.remove('highlighted', 'highlighted-teal', 'highlighted-gold');

        if (p === targetKey) {
          el.classList.remove('dimmed');
          if (targetKey === 'stroma') {
            el.classList.add('highlighted-teal');
          } else if (targetKey === 'lumen') {
            el.classList.add('highlighted-gold');
          } else {
            el.classList.add('highlighted');
          }
        } else if (targetKey === 'granum' && (p === 'thylakoid' || p === 'lumen')) {
          el.classList.remove('dimmed');
          el.classList.add('highlighted');
        } else {
          el.classList.add('dimmed');
        }
      });
    }

    // Button interactions (tap/click & hover)
    buttons.forEach(btn => {
      btn.addEventListener('click', () => {
        highlightPart(btn.dataset.target);
      });
      btn.addEventListener('mouseenter', () => {
        highlightPart(btn.dataset.target);
      });
    });

    // SVG elements interaction (tap & hover)
    parts.forEach(elem => {
      elem.addEventListener('mouseenter', () => {
        const key = elem.getAttribute('data-part');
        if (key) highlightPart(key);
      });
      elem.addEventListener('click', (e) => {
        e.stopPropagation();
        const key = elem.getAttribute('data-part');
        if (key) highlightPart(key);
      });
    });

    // Reset when hovering off diagram wrapper
    document.querySelector('.stage-wrapper').addEventListener('mouseleave', () => {
      const activeBtn = document.querySelector('.btn.active');
      if (!activeBtn || activeBtn.dataset.target === 'all') {
        highlightPart('all');
      }
    });
  </script>
</body>
</html>

OGS.10.CB.6

Aligned learning resources

Related diagrams