<!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: transparent;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .title {
      font-size: 17px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 12px;
      color: #0f172a;
    }

    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
      max-width: 640px;
    }

    @media (max-width: 480px) {
      .grid {
        grid-template-columns: 1fr;
        gap: 16px;
      }
    }

    .column {
      background: #f8fafc;
      border-radius: 12px;
      padding: 12px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .col-bad {
      border: 1.5px dashed #fca5a5;
      background: #fffafa;
    }

    .col-good {
      border: 1.5px solid #86efac;
      background: #f0fdf4;
    }

    .col-header {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      padding-bottom: 2px;
    }

    .col-bad .col-header { color: #dc2626; }
    .col-good .col-header { color: #16a34a; }

    .step-box {
      width: 100%;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 6px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    }

    .gen-tag {
      font-size: 10px;
      font-weight: 700;
      color: #64748b;
      margin-bottom: 3px;
      text-transform: uppercase;
    }

    .cells-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      flex-wrap: wrap;
    }

    .cell {
      padding: 3px 6px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      gap: 3px;
    }

    .cell-2n { background: #e0f2fe; color: #0369a1; border: 1px solid #bae6fd; }
    .cell-n  { background: #fef08a; color: #854d0e; border: 1px solid #fde047; font-size: 11px; }
    .cell-4n { background: #fee2e2; color: #b91c1c; border: 1px solid #fecaca; }
    .cell-8n { background: #ef4444; color: #ffffff; border: 1px solid #dc2626; font-size: 13px; }

    .arrow {
      color: #94a3b8;
      font-size: 13px;
      line-height: 1;
      font-weight: bold;
    }

    .meiosis-arrow {
      color: #16a34a;
      font-size: 10px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 3px;
    }

    .badge {
      font-size: 11px;
      font-weight: 700;
      padding: 4px 8px;
      border-radius: 20px;
      text-align: center;
      margin-top: 4px;
      width: 100%;
    }

    .badge-error {
      background: #fee2e2;
      color: #b91c1c;
      border: 1px solid #fca5a5;
    }

    .badge-success {
      background: #dcfce7;
      color: #15803d;
      border: 1px solid #86efac;
    }
  </style>
</head>
<body>

  <div class="title">Why Reduction Is Essential</div>

  <div class="grid">
    
    <div class="column col-bad">
      <div class="col-header">Without Reduction (Hypothetical)</div>

      
      <div class="step-box">
        <span class="gen-tag">Generation 1</span>
        <div class="cells-row">
          <span class="cell cell-2n">2n = 46</span>
          <span style="font-size:11px;color:#64748b;">+</span>
          <span class="cell cell-2n">2n = 46</span>
        </div>
      </div>

      <div class="arrow">↓</div>

      
      <div class="step-box">
        <span class="gen-tag">Generation 2</span>
        <div class="cells-row">
          <span class="cell cell-4n">4n = 92</span>
        </div>
      </div>

      <div class="arrow">↓</div>

      
      <div class="step-box">
        <span class="gen-tag">Generation 3</span>
        <div class="cells-row">
          <span class="cell cell-8n">8n = 184</span>
        </div>
      </div>

      <div class="badge badge-error">✕ Cell Overload &amp; Lethal Error</div>
    </div>

    
    <div class="column col-good">
      <div class="col-header">With Meiosis (Reality)</div>

      
      <div class="step-box">
        <span class="gen-tag">Generation 1 (Gametes)</span>
        <div class="cells-row">
          <span class="cell cell-n">n = 23</span>
          <span style="font-size:11px;color:#64748b;">+</span>
          <span class="cell cell-n">n = 23</span>
        </div>
      </div>

      <div class="arrow" style="color:#16a34a;">↓ Fertilization</div>

      
      <div class="step-box">
        <span class="gen-tag">Generation 2</span>
        <div class="cells-row">
          <span class="cell cell-2n">2n = 46</span>
        </div>
      </div>

      <div class="arrow" style="color:#16a34a;">↓ Meiosis + Fertilization</div>

      
      <div class="step-box">
        <span class="gen-tag">Generation 3</span>
        <div class="cells-row">
          <span class="cell cell-2n">2n = 46</span>
        </div>
      </div>

      <div class="badge badge-success">✓ Stable Ploidy (2n = 46)</div>
    </div>
  </div>

</body>
</html>

Why Chromosome Reduction Matters for Sexual Reproduction

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Sexual Life Cycle</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      width: 100%;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 6px 8px 8px;
      user-select: none;
    }

    .diagram-stage {
      position: relative;
      width: 100%;
      max-width: 480px;
      aspect-ratio: 460 / 325;
    }

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

    /* Track paths */
    .flow-line {
      fill: none;
      stroke: #cbd5e1;
      stroke-width: 2.5;
      stroke-linecap: round;
    }

    .flow-active {
      fill: none;
      stroke: #0284c7;
      stroke-width: 3;
      stroke-linecap: round;
      stroke-dasharray: 7 5;
      animation: flowDash 1.2s linear infinite;
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    @keyframes flowDash {
      to { stroke-dashoffset: -24; }
    }

    /* Node Cards */
    .node-group {
      cursor: pointer;
    }

    .node-bg {
      fill: #ffffff;
      stroke: #94a3b8;
      stroke-width: 1.5;
      rx: 10;
      transition: stroke 0.25s ease, stroke-width 0.25s ease, filter 0.25s ease;
    }

    .node-group:hover .node-bg {
      stroke: #0284c7;
      filter: drop-shadow(0 2px 6px rgba(2, 132, 199, 0.15));
    }

    .node-group.active .node-bg {
      stroke: #0284c7;
      stroke-width: 2.25;
      filter: drop-shadow(0 3px 8px rgba(2, 132, 199, 0.25));
    }

    .pulse-ring {
      fill: none;
      stroke: #22b7ff;
      stroke-width: 2;
      rx: 12;
      opacity: 0;
    }

    .node-group.active .pulse-ring {
      animation: pulse 2s ease-out infinite;
    }

    @keyframes pulse {
      0% {
        opacity: 0.9;
        stroke-width: 2;
      }
      50% {
        opacity: 0.35;
        stroke-width: 5;
      }
      100% {
        opacity: 0;
        stroke-width: 7;
      }
    }

    /* Chromosome Badges */
    .badge-diploid {
      fill: #e0f2fe;
      stroke: #0284c7;
      stroke-width: 1;
      rx: 5;
    }

    .badge-haploid {
      fill: #fef3c7;
      stroke: #d97706;
      stroke-width: 1;
      rx: 5;
    }

    .text-title {
      font-size: 13px;
      font-weight: 700;
      fill: #1e2945;
      text-anchor: middle;
    }

    .text-sub {
      font-size: 11px;
      font-weight: 700;
      text-anchor: middle;
    }

    .text-diploid {
      fill: #0369a1;
    }

    .text-haploid {
      fill: #b45309;
    }

    .process-pill {
      fill: #ffffff;
      stroke: #cbd5e1;
      stroke-width: 1.25;
      transition: stroke 0.3s ease, fill 0.3s ease;
      filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.04));
    }

    .process-label {
      font-size: 10.5px;
      font-weight: 700;
      fill: #334155;
      text-anchor: middle;
      transition: fill 0.3s ease;
    }

    .process-group.active .process-pill {
      stroke: #0284c7;
      fill: #e0f2fe;
    }

    .process-group.active .process-label {
      fill: #0369a1;
    }

    /* Step Controls */
    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 5px;
      width: 100%;
      max-width: 480px;
      margin-top: 4px;
      flex-wrap: wrap;
    }

    .step-btn {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      color: #334155;
      padding: 5px 9px;
      border-radius: 16px;
      font-size: 11.5px;
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 3px;
      transition: background 0.2s, border-color 0.2s, color 0.2s;
    }

    .step-btn:hover {
      background: #f1f5f9;
      color: #0f172a;
      border-color: #94a3b8;
    }

    .step-btn.active {
      background: #e0f2fe;
      border-color: #0284c7;
      color: #0369a1;
      font-weight: 700;
    }

    .play-btn {
      background: #ffffff;
      border: 1px solid #94a3b8;
      color: #1e2945;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 11px;
      cursor: pointer;
      padding: 0;
      transition: border-color 0.2s, color 0.2s, background 0.2s;
    }

    .play-btn:hover {
      border-color: #0284c7;
      color: #0284c7;
      background: #f0f9ff;
    }

    @media (max-width: 400px) {
      .step-btn {
        padding: 4px 7px;
        font-size: 10.5px;
      }
    }
  </style>
</head>
<body>

  <div class="diagram-stage">
    <svg viewBox="0 0 460 325">
      <defs>
        
        <marker id="arrow" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="5" markerHeight="5" orient="auto-start-reverse">
          <path d="M 0 1.5 L 8 5 L 0 8.5 z" fill="#94a3b8" />
        </marker>
        <marker id="arrow-active" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="5" markerHeight="5" orient="auto-start-reverse">
          <path d="M 0 1.5 L 8 5 L 0 8.5 z" fill="#0284c7" />
        </marker>
      </defs>

      
      <path id="path-meiosis-l" class="flow-line" marker-end="url(#arrow)" d="M 225 60 C 205 80, 185 100, 175 131" />
      <path id="path-meiosis-r" class="flow-line" marker-end="url(#arrow)" d="M 275 60 C 295 80, 315 100, 325 131" />

      <path id="active-meiosis-l" class="flow-active" marker-end="url(#arrow-active)" d="M 225 60 C 205 80, 185 100, 175 131" />
      <path id="active-meiosis-r" class="flow-active" marker-end="url(#arrow-active)" d="M 275 60 C 295 80, 315 100, 325 131" />

      
      <path id="path-fert-l" class="flow-line" marker-end="url(#arrow)" d="M 175 189 C 185 220, 205 240, 225 258" />
      <path id="path-fert-r" class="flow-line" marker-end="url(#arrow)" d="M 325 189 C 315 220, 295 240, 275 258" />

      <path id="active-fert-l" class="flow-active" marker-end="url(#arrow-active)" d="M 175 189 C 185 220, 205 240, 225 258" />
      <path id="active-fert-r" class="flow-active" marker-end="url(#arrow-active)" d="M 325 189 C 315 220, 295 240, 275 258" />

      
      <path id="path-mitosis" class="flow-line" marker-end="url(#arrow)" d="M 185 288 C 16 265, 16 55, 185 34" />
      <path id="active-mitosis" class="flow-active" marker-end="url(#arrow-active)" d="M 185 288 C 16 265, 16 55, 185 34" />

      
      <g id="lbl-meiosis" class="process-group">
        <rect class="process-pill" x="175" y="92" width="150" height="24" rx="12" />
        <text class="process-label" id="txt-meiosis" x="250" y="108">Meiosis (Reduction)</text>
      </g>

      <g id="lbl-fertilization" class="process-group">
        <rect class="process-pill" x="165" y="209" width="170" height="24" rx="12" />
        <text class="process-label" id="txt-fertilization" x="250" y="225">Fertilization (Restoration)</text>
      </g>

      <g id="lbl-mitosis" class="process-group">
        <rect class="process-pill" x="4" y="149" width="108" height="24" rx="12" />
        <text class="process-label" id="txt-mitosis" x="58" y="165">Mitosis &amp; Growth</text>
      </g>

      
      <g id="node-adult" class="node-group" onclick="setStep(0)">
        <rect class="pulse-ring" x="183" y="6" width="134" height="56" />
        <rect class="node-bg" x="185" y="8" width="130" height="52" />
        <text class="text-title" x="250" y="28">Adult 🧑</text>
        <rect class="badge-diploid" x="210" y="35" width="80" height="18" />
        <text class="text-sub text-diploid" x="250" y="48">2n = 46</text>
      </g>

      
      <g id="node-sperm" class="node-group" onclick="setStep(1)">
        <rect class="pulse-ring" x="123" y="133" width="104" height="56" />
        <rect class="node-bg" x="125" y="135" width="100" height="52" />
        <text class="text-title" x="175" y="155">Sperm ⚡</text>
        <rect class="badge-haploid" x="142" y="162" width="66" height="18" />
        <text class="text-sub text-haploid" x="175" y="175">n = 23</text>
      </g>

      
      <g id="node-egg" class="node-group" onclick="setStep(1)">
        <rect class="pulse-ring" x="273" y="133" width="104" height="56" />
        <rect class="node-bg" x="275" y="135" width="100" height="52" />
        <text class="text-title" x="325" y="155">Egg 🥚</text>
        <rect class="badge-haploid" x="292" y="162" width="66" height="18" />
        <text class="text-sub text-haploid" x="325" y="175">n = 23</text>
      </g>

      
      <g id="node-zygote" class="node-group" onclick="setStep(2)">
        <rect class="pulse-ring" x="183" y="260" width="134" height="56" />
        <rect class="node-bg" x="185" y="262" width="130" height="52" />
        <text class="text-title" x="250" y="282">Zygote 🔬</text>
        <rect class="badge-diploid" x="210" y="289" width="80" height="18" />
        <text class="text-sub text-diploid" x="250" y="302">2n = 46</text>
      </g>

    </svg>
  </div>

  
  <div class="controls">
    <button class="play-btn" id="playToggle" title="Play/Pause loop">⏸</button>
    <button class="step-btn" onclick="setStep(0)">1. Adult (2n)</button>
    <button class="step-btn" onclick="setStep(1)">2. Meiosis (n)</button>
    <button class="step-btn" onclick="setStep(2)">3. Fertilization (2n)</button>
    <button class="step-btn" onclick="setStep(3)">4. Mitosis</button>
  </div>

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

    const nodes = {
      adult: document.getElementById('node-adult'),
      sperm: document.getElementById('node-sperm'),
      egg: document.getElementById('node-egg'),
      zygote: document.getElementById('node-zygote')
    };

    const flows = {
      meiosisL: document.getElementById('active-meiosis-l'),
      meiosisR: document.getElementById('active-meiosis-r'),
      fertL: document.getElementById('active-fert-l'),
      fertR: document.getElementById('active-fert-r'),
      mitosis: document.getElementById('active-mitosis')
    };

    const labelGroups = {
      meiosis: document.getElementById('lbl-meiosis'),
      fertilization: document.getElementById('lbl-fertilization'),
      mitosis: document.getElementById('lbl-mitosis')
    };

    const stepBtns = document.querySelectorAll('.step-btn');
    const playToggle = document.getElementById('playToggle');

    function updateView() {
      // Clear active states
      Object.values(nodes).forEach(n => n.classList.remove('active'));
      Object.values(flows).forEach(f => f.style.opacity = '0');
      Object.values(labelGroups).forEach(l => l.classList.remove('active'));
      stepBtns.forEach((b, i) => b.classList.toggle('active', i === currentStep));

      if (currentStep === 0) {
        // Step 1: Adult
        nodes.adult.classList.add('active');
      } else if (currentStep === 1) {
        // Step 2: Meiosis -> Sperm + Egg
        nodes.sperm.classList.add('active');
        nodes.egg.classList.add('active');
        flows.meiosisL.style.opacity = '1';
        flows.meiosisR.style.opacity = '1';
        labelGroups.meiosis.classList.add('active');
      } else if (currentStep === 2) {
        // Step 3: Fertilization -> Zygote
        nodes.zygote.classList.add('active');
        flows.fertL.style.opacity = '1';
        flows.fertR.style.opacity = '1';
        labelGroups.fertilization.classList.add('active');
      } else if (currentStep === 3) {
        // Step 4: Mitosis -> Adult
        nodes.adult.classList.add('active');
        flows.mitosis.style.opacity = '1';
        labelGroups.mitosis.classList.add('active');
      }
    }

    function setStep(idx) {
      currentStep = idx;
      updateView();
    }

    function startLoop() {
      stopLoop();
      timer = setInterval(() => {
        currentStep = (currentStep + 1) % 4;
        updateView();
      }, 4000);
    }

    function stopLoop() {
      if (timer) clearInterval(timer);
    }

    playToggle.addEventListener('click', () => {
      isPlaying = !isPlaying;
      playToggle.textContent = isPlaying ? '⏸' : '▶';
      if (isPlaying) {
        startLoop();
      } else {
        stopLoop();
      }
    });

    // Initialize
    updateView();
    startLoop();
  </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 {
      width: 100%;
      background: #f8f9fa;
      color: #1e2945;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 12px;
      user-select: none;
    }

    .controls {
      display: flex;
      gap: 8px;
      margin-bottom: 8px;
    }

    .filter-btn {
      background: #ffffff;
      border: 1px solid #e6e6e6;
      border-radius: 20px;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      color: #1e2945;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .filter-btn.active {
      background: #22b7ff;
      border-color: #22b7ff;
      color: #ffffff;
    }

    .cells-container {
      width: 100%;
      max-width: 580px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex: 1;
    }

    .cell-box {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #ffffff;
      border: 1px solid #e6e6e6;
      border-radius: 16px;
      padding: 12px 8px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.03);
      position: relative;
    }

    .cell-label {
      font-size: 15px;
      font-weight: 700;
      color: #1e2945;
      margin-bottom: 2px;
    }

    .cell-sublabel {
      font-size: 12px;
      font-weight: 600;
      color: #6b7280;
      margin-bottom: 8px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .cell-interior {
      width: 100%;
      height: 150px;
      background: #f8f9fa;
      border: 2px dashed #d1d5db;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }

    .arrow-divider {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: #9ca3af;
      font-size: 20px;
      font-weight: 700;
      padding: 0 4px;
    }

    .chrom-group {
      cursor: pointer;
      transition: opacity 0.25s ease, filter 0.25s ease;
    }

    .chrom-group.dimmed {
      opacity: 0.2;
    }

    .chrom-group.highlighted {
      filter: drop-shadow(0 0 4px rgba(34, 183, 255, 0.8));
    }

    .legend-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-top: 8px;
      font-size: 12px;
      font-weight: 600;
      color: #6b7280;
    }

    .legend-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .legend-bar {
      width: 12px;
      height: 6px;
      border-radius: 3px;
    }

    .bar-blue { background: #22b7ff; }
    .bar-red { background: #f43f5e; }
  </style>
</head>
<body>

  <div class="controls">
    <button class="filter-btn active" data-filter="all">All</button>
    <button class="filter-btn" data-filter="pair1">Pair 1 (Long)</button>
    <button class="filter-btn" data-filter="pair2">Pair 2 (Short)</button>
  </div>

  <div class="cells-container">
    
    <div class="cell-box">
      <div class="cell-label">Diploid (2n = 4)</div>
      <div class="cell-sublabel">Homologous Pairs</div>
      <div class="cell-interior">
        <svg viewBox="0 0 160 140" width="100%" height="100%">
          
          <g class="chrom-group chrom-p1" onclick="selectFilter('pair1')">
            
            <path d="M 44 26 Q 47 48 46 70 Q 45 92 42 114" fill="none" stroke="#22b7ff" stroke-width="11" stroke-linecap="round"/>
            <circle cx="45.5" cy="70" r="3" fill="#ffffff" />
            
            
            <path d="M 64 26 Q 61 48 62 70 Q 63 92 66 114" fill="none" stroke="#f43f5e" stroke-width="11" stroke-linecap="round"/>
            <circle cx="62.5" cy="70" r="3" fill="#ffffff" />
          </g>

          
          <g class="chrom-group chrom-p2" onclick="selectFilter('pair2')">
            
            <path d="M 98 42 Q 100 58 99 72 Q 98 86 96 100" fill="none" stroke="#22b7ff" stroke-width="10" stroke-linecap="round"/>
            <circle cx="98.5" cy="71" r="2.5" fill="#ffffff" />

            
            <path d="M 116 42 Q 114 58 115 72 Q 116 86 118 100" fill="none" stroke="#f43f5e" stroke-width="10" stroke-linecap="round"/>
            <circle cx="115.5" cy="71" r="2.5" fill="#ffffff" />
          </g>
        </svg>
      </div>
    </div>

    <div class="arrow-divider">→</div>

    
    <div class="cell-box">
      <div class="cell-label">Haploid (n = 2)</div>
      <div class="cell-sublabel">Single Set</div>
      <div class="cell-interior">
        <svg viewBox="0 0 160 140" width="100%" height="100%">
          
          <g class="chrom-group chrom-p1" onclick="selectFilter('pair1')">
            <path d="M 58 26 Q 61 48 60 70 Q 59 92 56 114" fill="none" stroke="#22b7ff" stroke-width="11" stroke-linecap="round"/>
            <circle cx="59.5" cy="70" r="3" fill="#ffffff" />
          </g>

          
          <g class="chrom-group chrom-p2" onclick="selectFilter('pair2')">
            <path d="M 102 42 Q 100 58 101 72 Q 102 86 104 100" fill="none" stroke="#f43f5e" stroke-width="10" stroke-linecap="round"/>
            <circle cx="101.5" cy="71" r="2.5" fill="#ffffff" />
          </g>
        </svg>
      </div>
    </div>
  </div>

  <div class="legend-row">
    <div class="legend-item">
      <span class="legend-bar bar-blue"></span>
      <span>Set A</span>
    </div>
    <div class="legend-item">
      <span class="legend-bar bar-red"></span>
      <span>Set B</span>
    </div>
  </div>

  <script>
    const buttons = document.querySelectorAll('.filter-btn');
    const p1Elements = document.querySelectorAll('.chrom-p1');
    const p2Elements = document.querySelectorAll('.chrom-p2');

    function selectFilter(filter) {
      buttons.forEach(btn => {
        btn.classList.toggle('active', btn.dataset.filter === filter);
      });

      if (filter === 'pair1') {
        p1Elements.forEach(el => { el.classList.add('highlighted'); el.classList.remove('dimmed'); });
        p2Elements.forEach(el => { el.classList.remove('highlighted'); el.classList.add('dimmed'); });
      } else if (filter === 'pair2') {
        p1Elements.forEach(el => { el.classList.remove('highlighted'); el.classList.add('dimmed'); });
        p2Elements.forEach(el => { el.classList.add('highlighted'); el.classList.remove('dimmed'); });
      } else {
        p1Elements.forEach(el => { el.classList.remove('highlighted', 'dimmed'); });
        p2Elements.forEach(el => { el.classList.remove('highlighted', 'dimmed'); });
      }
    }

    buttons.forEach(btn => {
      btn.addEventListener('click', () => selectFilter(btn.dataset.filter));
    });
  </script>
</body>
</html>

OGS.10.GVE.2

Aligned learning resources

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