<!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;
      gap: 12px;
      min-height: 100%;
      user-select: none;
    }

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

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

    .column {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .col-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding-bottom: 8px;
      border-bottom: 2px solid #f1f5f9;
    }

    .col-title {
      font-size: 15px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .comp-title { color: #0284c7; }
    .cont-title { color: #d97706; }

    .badge-symbol {
      font-size: 14px;
      font-weight: 800;
      padding: 2px 8px;
      border-radius: 6px;
    }

    .badge-comp {
      background: #e0f2fe;
      color: #0369a1;
    }

    .badge-cont {
      background: #fef3c7;
      color: #b45309;
    }

    /* Diagram visual areas */
    .visual-area {
      height: 140px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      background: #f8fafc;
      border-radius: 8px;
      padding: 8px;
      position: relative;
    }

    /* Complementary Puzzle */
    .puzzle-group {
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100%;
      max-width: 220px;
    }

    .puzzle-piece {
      width: 100%;
      padding: 8px 10px;
      font-size: 12px;
      font-weight: 600;
      text-align: center;
      color: #0f172a;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      position: relative;
      z-index: 1;
    }

    .puzzle-top {
      background: #bae6fd;
      border: 2px solid #38bdf8;
      border-radius: 8px 8px 0 0;
      border-bottom: none;
      padding-bottom: 12px;
    }

    .puzzle-bottom {
      background: #7dd3fc;
      border: 2px solid #38bdf8;
      border-radius: 0 0 8px 8px;
      border-top: none;
      padding-top: 12px;
      margin-top: -4px;
    }

    .puzzle-joint {
      width: 28px;
      height: 14px;
      background: #bae6fd;
      border-left: 2px solid #38bdf8;
      border-right: 2px solid #38bdf8;
      border-bottom: 2px solid #38bdf8;
      border-radius: 0 0 14px 14px;
      margin: -2px auto -12px auto;
      z-index: 2;
    }

    .source-tag {
      display: block;
      font-size: 10px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #475569;
      margin-bottom: 2px;
    }

    /* Contrasting Opposing Arrows */
    .oppose-group {
      display: flex;
      flex-direction: column;
      gap: 10px;
      width: 100%;
      max-width: 220px;
      position: relative;
    }

    .oppose-card {
      width: 100%;
      padding: 8px 10px;
      font-size: 12px;
      font-weight: 600;
      border-radius: 6px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .oppose-1 {
      background: #fed7aa;
      border: 2px solid #fb923c;
      color: #9a3412;
    }

    .oppose-2 {
      background: #fde68a;
      border: 2px solid #f59e0b;
      color: #92400e;
    }

    .oppose-symbol {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      background: #ffffff;
      border: 2px solid #ea580c;
      color: #ea580c;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      font-weight: 800;
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
      z-index: 3;
    }

    /* Word Badges Section */
    .connectors-section {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .section-label {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #64748b;
    }

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

    .pill {
      font-size: 12px;
      font-weight: 600;
      padding: 4px 8px;
      border-radius: 20px;
      white-space: nowrap;
      transition: background-color 0.2s ease;
    }

    .pill-comp {
      background: #f0f9ff;
      border: 1px solid #bae6fd;
      color: #0369a1;
    }

    .pill-cont {
      background: #fffbeb;
      border: 1px solid #fde68a;
      color: #b45309;
    }
  </style>
</head>
<body>

  <div class="grid-container">
    
    
    <div class="column">
      <div class="col-header">
        <span class="col-title comp-title">Complementary</span>
        <span class="badge-symbol badge-comp">+ Fit</span>
      </div>

      <div class="visual-area">
        <div class="puzzle-group">
          <div class="puzzle-piece puzzle-top">
            <span class="source-tag">Source 1</span>
            Cheaper bus fares
          </div>
          <div class="puzzle-joint"></div>
          <div class="puzzle-piece puzzle-bottom">
            <span class="source-tag">Source 2</span>
            Bus ridership grew 20%
          </div>
        </div>
      </div>

      <div class="connectors-section">
        <span class="section-label">Signal Words</span>
        <div class="pills-container">
          <span class="pill pill-comp">Furthermore</span>
          <span class="pill pill-comp">Additionally</span>
          <span class="pill pill-comp">In support of this</span>
        </div>
      </div>
    </div>

    
    <div class="column">
      <div class="col-header">
        <span class="col-title cont-title">Contrasting</span>
        <span class="badge-symbol badge-cont">⇋ Clash</span>
      </div>

      <div class="visual-area">
        <div class="oppose-group">
          <div class="oppose-card oppose-1">
            <div>
              <span class="source-tag">Source 1</span>
              Fast commute times
            </div>
            <span>➔</span>
          </div>

          <div class="oppose-symbol">⚡</div>

          <div class="oppose-card oppose-2">
            <div>
              <span class="source-tag">Source 2</span>
              Frequent mechanical delays
            </div>
            <span>➔</span>
          </div>
        </div>
      </div>

      <div class="connectors-section">
        <span class="section-label">Signal Words</span>
        <div class="pills-container">
          <span class="pill pill-cont">However</span>
          <span class="pill pill-cont">On the other hand</span>
          <span class="pill pill-cont">Conversely</span>
        </div>
      </div>
    </div>

  </div>

</body>
</html>

Synthesizing Evidence Across Multiple Informational Texts

<!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;
      gap: 10px;
    }

    /* Top Sources Grid */
    .sources-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
    }

    .source-card {
      border-radius: 10px;
      padding: 10px;
      transition: opacity 0.25s ease, box-shadow 0.25s ease;
      position: relative;
    }

    .source-green {
      background: #ecfdf5;
      border: 1.5px solid #10b981;
    }

    .source-amber {
      background: #fffbeb;
      border: 1.5px solid #f59e0b;
    }

    .source-header {
      display: flex;
      align-items: center;
      gap: 6px;
      font-weight: 700;
      font-size: 14px;
      margin-bottom: 6px;
    }

    .source-green .source-header { color: #047857; }
    .source-amber .source-header { color: #b45309; }

    .claim-item {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 13.5px;
      font-weight: 600;
      padding: 3px 0;
      color: #1e2945;
      transition: transform 0.2s ease;
    }

    .badge-stat {
      padding: 2px 6px;
      border-radius: 6px;
      font-weight: 700;
      font-size: 12.5px;
      white-space: nowrap;
    }

    .badge-green { background: #a7f3d0; color: #065f46; }
    .badge-amber { background: #fde68a; color: #92400e; }

    /* Interactive synthesis bar */
    .synth-tabs {
      display: flex;
      gap: 6px;
      background: #f1f5f9;
      padding: 4px;
      border-radius: 8px;
    }

    .tab-btn {
      flex: 1;
      border: none;
      background: transparent;
      padding: 6px 4px;
      font-size: 13px;
      font-weight: 700;
      color: #64748b;
      border-radius: 6px;
      cursor: pointer;
      text-align: center;
      transition: all 0.2s ease;
    }

    .tab-btn.active {
      background: #ffffff;
      color: #1e2945;
      box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    }

    /* Synthesis Result Panel */
    .synth-panel {
      background: #f8fafc;
      border: 1.5px solid #cbd5e1;
      border-radius: 10px;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .tag-row {
      display: flex;
      align-items: flex-start;
      gap: 8px;
      font-size: 13.5px;
      line-height: 1.35;
      padding: 4px 6px;
      border-radius: 6px;
      transition: background 0.2s ease;
    }

    .tag-row.highlight {
      background: #e0f2fe;
      box-shadow: inset 0 0 0 1px #38bdf8;
    }

    .tag-label {
      font-weight: 800;
      font-size: 11px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      padding: 2px 6px;
      border-radius: 4px;
      white-space: nowrap;
      min-width: 95px;
      text-align: center;
    }

    .tag-topic { background: #e0e7ff; color: #4338ca; }
    .tag-complement { background: #dcfce7; color: #15803d; }
    .tag-contrast { background: #fee2e2; color: #b91c1c; }

    .tag-text {
      flex: 1;
      font-weight: 500;
      color: #334155;
    }

    .tag-text strong {
      color: #0f172a;
      font-weight: 700;
    }

    /* Dim / Focus states */
    .dimmed {
      opacity: 0.4;
    }
  </style>
</head>
<body>

  
  <div class="sources-grid">
    
    <div class="source-card source-green" id="card1">
      <div class="source-header">
        <span>🌱</span>
        <span>Dr. Alvarez</span>
      </div>
      <div class="claim-item" id="c1-stat">
        <span class="badge-stat badge-green">-15%</span>
        <span>Cooling Cost</span>
      </div>
      <div class="claim-item" id="c1-env">
        <span>🌧️</span>
        <span>Absorbs Rain</span>
      </div>
    </div>

    
    <div class="source-card source-amber" id="card2">
      <div class="source-header">
        <span>🏗️</span>
        <span>Eng. Chen</span>
      </div>
      <div class="claim-item" id="c2-stat">
        <span class="badge-stat badge-amber">+25%</span>
        <span>Build Cost</span>
      </div>
      <div class="claim-item" id="c2-load">
        <span>⚖️</span>
        <span>Heavy Soil/Water</span>
      </div>
    </div>
  </div>

  
  <div class="synth-tabs">
    <button class="tab-btn active" data-mode="all">🔍 Synthesize All</button>
    <button class="tab-btn" data-mode="topic">🎯 Topic</button>
    <button class="tab-btn" data-mode="complement">🤝 Overlap</button>
    <button class="tab-btn" data-mode="contrast">⚡ Contrast</button>
  </div>

  
  <div class="synth-panel">
    <div class="tag-row" id="row-topic">
      <span class="tag-label tag-topic">Topic</span>
      <span class="tag-text"><strong>Rooftop Gardens</strong> (Urban ecology & design)</span>
    </div>
    <div class="tag-row" id="row-complement">
      <span class="tag-label tag-complement">Complement</span>
      <span class="tag-text">Both focus on <strong>building costs & structural impacts</strong>.</span>
    </div>
    <div class="tag-row" id="row-contrast">
      <span class="tag-label tag-contrast">Contrast</span>
      <span class="tag-text"><strong>Alvarez:</strong> Energy savings vs. <strong>Chen:</strong> Heavy build expenses.</span>
    </div>
  </div>

  <script>
    const tabs = document.querySelectorAll('.tab-btn');
    const rowTopic = document.getElementById('row-topic');
    const rowComplement = document.getElementById('row-complement');
    const rowContrast = document.getElementById('row-contrast');
    const card1 = document.getElementById('card1');
    const card2 = document.getElementById('card2');

    function setMode(mode) {
      tabs.forEach(t => t.classList.toggle('active', t.dataset.mode === mode));

      // Reset styles
      [rowTopic, rowComplement, rowContrast].forEach(r => r.classList.remove('highlight', 'dimmed'));
      [card1, card2].forEach(c => c.classList.remove('dimmed'));

      if (mode === 'topic') {
        rowTopic.classList.add('highlight');
        rowComplement.classList.add('dimmed');
        rowContrast.classList.add('dimmed');
      } else if (mode === 'complement') {
        rowComplement.classList.add('highlight');
        rowTopic.classList.add('dimmed');
        rowContrast.classList.add('dimmed');
      } else if (mode === 'contrast') {
        rowContrast.classList.add('highlight');
        rowTopic.classList.add('dimmed');
        rowComplement.classList.add('dimmed');
      }
    }

    tabs.forEach(tab => {
      tab.addEventListener('click', () => setMode(tab.dataset.mode));
    });
  </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;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      background: transparent;
      padding: 12px;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      gap: 12px;
      justify-content: center;
      min-height: 100%;
    }

    .panel {
      border-radius: 12px;
      padding: 12px 14px;
      position: relative;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .panel-dont {
      background: #fff5f5;
      border: 1.5px solid #fecaca;
    }

    .panel-do {
      background: #f0fdf4;
      border: 1.5px solid #bbf7d0;
    }

    .panel-header {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 14px;
      font-weight: 700;
      letter-spacing: 0.02em;
      text-transform: uppercase;
    }

    .panel-dont .panel-header {
      color: #dc2626;
    }

    .panel-do .panel-header {
      color: #16a34a;
    }

    /* Don't Layout: Disconnected Blocks */
    .serial-flow {
      display: flex;
      flex-direction: column;
      gap: 6px;
      align-items: center;
    }

    .block {
      width: 100%;
      padding: 8px 12px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      text-align: center;
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      transition: opacity 0.2s ease;
    }

    .source-a {
      border-color: #93c5fd;
      color: #1d4ed8;
      background: #eff6ff;
    }

    .source-b {
      border-color: #c4b5fd;
      color: #6d28d9;
      background: #f5f3ff;
    }

    .gap-indicator {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 700;
      color: #ef4444;
      padding: 2px 0;
    }

    .gap-indicator span {
      display: inline-block;
      letter-spacing: 2px;
    }

    /* Do Layout: Sandwich Synthesis */
    .synthesis-sandwich {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .bun-top {
      background: #1e293b;
      color: #f8fafc;
      border: 1.5px solid #0f172a;
      font-weight: 700;
      border-radius: 8px 8px 4px 4px;
      padding: 8px 12px;
    }

    .integrated-row {
      display: flex;
      align-items: center;
      gap: 6px;
      width: 100%;
    }

    .integrated-row .block {
      flex: 1;
      font-size: 13px;
      padding: 7px 4px;
      white-space: nowrap;
    }

    .connector-badge {
      background: #f59e0b;
      color: #ffffff;
      font-size: 12px;
      font-weight: 800;
      padding: 5px 8px;
      border-radius: 20px;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      flex-shrink: 0;
      box-shadow: 0 1px 2px rgba(0,0,0,0.1);
    }

    .bun-bottom {
      background: #15803d;
      color: #ffffff;
      border: 1.5px solid #166534;
      font-weight: 700;
      border-radius: 4px 4px 8px 8px;
      padding: 8px 12px;
    }

    @media (max-width: 380px) {
      .integrated-row .block {
        font-size: 12px;
      }
      .connector-badge {
        font-size: 11px;
        padding: 4px 6px;
      }
      .panel-header {
        font-size: 13px;
      }
      .block {
        font-size: 13px;
      }
    }
  </style>
</head>
<body>

  
  <div class="panel panel-dont">
    <div class="panel-header">
      <span>✕</span>
      <span>Serial Summary</span>
    </div>
    <div class="serial-flow">
      <div class="block source-a">Source A</div>
      <div class="gap-indicator">
        <span>⚡</span> Isolated <span>⚡</span>
      </div>
      <div class="block source-b">Source B</div>
    </div>
  </div>

  
  <div class="panel panel-do">
    <div class="panel-header">
      <span>✓</span>
      <span>True Synthesis</span>
    </div>
    <div class="synthesis-sandwich">
      <div class="block bun-top">Core Claim</div>
      <div class="integrated-row">
        <div class="block source-a">Source A (Benefit)</div>
        <div class="connector-badge">However</div>
        <div class="block source-b">Source B (Limit)</div>
      </div>
      <div class="block bun-bottom">Synthesized Takeaway</div>
    </div>
  </div>

</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>Synthesizing Evidence Diagram</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      background: #f8f9fa;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
    }

    .diagram-area {
      width: 100%;
      max-width: 480px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .sources-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      width: 100%;
    }

    .source-card {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 10px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 4px;
      transition: all 0.3s ease;
      position: relative;
    }

    .card-a {
      border-top: 4px solid #0d9488;
    }

    .card-b {
      border-top: 4px solid #d97706;
    }

    .source-card.dimmed {
      opacity: 0.45;
      transform: scale(0.98);
    }

    .source-card.active-a {
      border-color: #0d9488;
      box-shadow: 0 4px 12px rgba(13, 148, 136, 0.18);
      transform: translateY(-2px);
    }

    .source-card.active-b {
      border-color: #d97706;
      box-shadow: 0 4px 12px rgba(217, 119, 6, 0.18);
      transform: translateY(-2px);
    }

    .source-tag {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .tag-a { color: #0d9488; }
    .tag-b { color: #d97706; }

    .source-fact {
      font-size: 13px;
      font-weight: 600;
      color: #1e293b;
      line-height: 1.3;
    }

    .source-sub {
      font-size: 11px;
      color: #64748b;
    }

    /* SVG Flow Arrows */
    .connector-svg {
      width: 100%;
      height: 38px;
      overflow: visible;
    }

    .flow-line {
      fill: none;
      stroke: #cbd5e1;
      stroke-width: 2.5;
      stroke-dasharray: 4 4;
      transition: stroke 0.3s ease, stroke-width 0.3s ease;
    }

    .flow-line.active-a {
      stroke: #0d9488;
      stroke-width: 3;
      animation: dashFlow 1s linear infinite;
    }

    .flow-line.active-b {
      stroke: #d97706;
      stroke-width: 3;
      animation: dashFlow 1s linear infinite;
    }

    @keyframes dashFlow {
      to { stroke-dashoffset: -16; }
    }

    /* Synthesized Card */
    .synthesis-card {
      width: 100%;
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 10px;
      padding: 12px 14px;
      text-align: center;
      transition: all 0.3s ease;
      position: relative;
    }

    .synthesis-card.active {
      border-color: #6366f1;
      box-shadow: 0 4px 16px rgba(99, 102, 241, 0.18);
      background: linear-gradient(180deg, #ffffff 0%, #f8faff 100%);
    }

    .synthesis-card.dimmed {
      opacity: 0.45;
    }

    .synthesis-badge {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #6366f1;
      margin-bottom: 4px;
    }

    .synthesis-text {
      font-size: 13px;
      font-weight: 600;
      color: #0f172a;
      line-height: 1.4;
    }

    .highlight-teal {
      color: #0f766e;
      background: #ccfbf1;
      padding: 1px 4px;
      border-radius: 4px;
      font-weight: 700;
    }

    .highlight-amber {
      color: #b45309;
      background: #fef3c7;
      padding: 1px 4px;
      border-radius: 4px;
      font-weight: 700;
    }

    /* Controls Bar */
    .stepper-nav {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      width: 100%;
      max-width: 480px;
      margin-top: 6px;
    }

    .step-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #475569;
      padding: 6px 10px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: all 0.2s ease;
    }

    .step-btn.active {
      background: #1e293b;
      color: #ffffff;
      border-color: #1e293b;
    }

    .play-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #1e293b;
      width: 30px;
      height: 30px;
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      cursor: pointer;
    }

    @media (max-width: 380px) {
      .source-fact { font-size: 12px; }
      .synthesis-text { font-size: 12px; }
      .step-btn { padding: 5px 8px; font-size: 11px; }
    }
  </style>
</head>
<body>

  <div class="diagram-area">
    
    <div class="sources-row">
      <div id="cardA" class="source-card card-a">
        <span class="source-tag tag-a">Source A</span>
        <span class="source-fact">⚡ Long-term Savings</span>
        <span class="source-sub">Saves $1,500/year on bills</span>
      </div>

      <div id="cardB" class="source-card card-b">
        <span class="source-tag tag-b">Source B</span>
        <span class="source-fact">💸 Upfront Costs</span>
        <span class="source-sub">Costs $15,000 to install</span>
      </div>
    </div>

    
    <svg class="connector-svg" viewBox="0 0 300 40" preserveAspectRatio="none">
      <defs>
        <marker id="arrow-teal" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="5" markerHeight="5" orient="auto-start-reverse">
          <path d="M 0 1 L 10 5 L 0 9 z" fill="#0d9488" />
        </marker>
        <marker id="arrow-amber" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="5" markerHeight="5" orient="auto-start-reverse">
          <path d="M 0 1 L 10 5 L 0 9 z" fill="#d97706" />
        </marker>
        <marker id="arrow-gray" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="5" markerHeight="5" orient="auto-start-reverse">
          <path d="M 0 1 L 10 5 L 0 9 z" fill="#cbd5e1" />
        </marker>
      </defs>
      
      <path id="pathA" class="flow-line" d="M 75 2 C 75 24, 140 20, 145 36" marker-end="url(#arrow-gray)" />
      
      <path id="pathB" class="flow-line" d="M 225 2 C 225 24, 160 20, 155 36" marker-end="url(#arrow-gray)" />
    </svg>

    
    <div id="synthCard" class="synthesis-card">
      <div class="synthesis-badge">✦ Synthesized Insight</div>
      <div id="synthText" class="synthesis-text">
        Solar saves money over time despite high upfront costs.
      </div>
    </div>
  </div>

  
  <div class="stepper-nav">
    <button id="btnPlay" class="play-btn" onclick="toggleAutoPlay()" title="Toggle auto-play">⏸</button>
    <button id="step0" class="step-btn" onclick="setStep(0)">1. Source A</button>
    <button id="step1" class="step-btn" onclick="setStep(1)">2. Source B</button>
    <button id="step2" class="step-btn active" onclick="setStep(2)">3. Synthesize</button>
  </div>

  <script>
    let currentStep = 2;
    let isPlaying = true;
    let timer = null;

    const cardA = document.getElementById('cardA');
    const cardB = document.getElementById('cardB');
    const synthCard = document.getElementById('synthCard');
    const synthText = document.getElementById('synthText');
    const pathA = document.getElementById('pathA');
    const pathB = document.getElementById('pathB');
    const btnPlay = document.getElementById('btnPlay');
    const buttons = [
      document.getElementById('step0'),
      document.getElementById('step1'),
      document.getElementById('step2')
    ];

    function updateView() {
      // Update buttons
      buttons.forEach((btn, idx) => {
        btn.classList.toggle('active', idx === currentStep);
      });

      if (currentStep === 0) {
        // Source A focus
        cardA.className = 'source-card card-a active-a';
        cardB.className = 'source-card card-b dimmed';
        pathA.className = 'flow-line active-a';
        pathA.setAttribute('marker-end', 'url(#arrow-teal)');
        pathB.className = 'flow-line';
        pathB.setAttribute('marker-end', 'url(#arrow-gray)');
        synthCard.className = 'synthesis-card dimmed';
        synthText.innerHTML = '<span class="highlight-teal">Source A only:</span> Focuses solely on long-term bill savings.';
      } else if (currentStep === 1) {
        // Source B focus
        cardA.className = 'source-card card-a dimmed';
        cardB.className = 'source-card card-b active-b';
        pathA.className = 'flow-line';
        pathA.setAttribute('marker-end', 'url(#arrow-gray)');
        pathB.className = 'flow-line active-b';
        pathB.setAttribute('marker-end', 'url(#arrow-amber)');
        synthCard.className = 'synthesis-card dimmed';
        synthText.innerHTML = '<span class="highlight-amber">Source B only:</span> Focuses solely on initial equipment costs.';
      } else {
        // Synthesis
        cardA.className = 'source-card card-a active-a';
        cardB.className = 'source-card card-b active-b';
        pathA.className = 'flow-line active-a';
        pathA.setAttribute('marker-end', 'url(#arrow-teal)');
        pathB.className = 'flow-line active-b';
        pathB.setAttribute('marker-end', 'url(#arrow-amber)');
        synthCard.className = 'synthesis-card active';
        synthText.innerHTML = 'Solar <span class="highlight-teal">saves money over decades</span> despite <span class="highlight-amber">high upfront costs</span>.';
      }
    }

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

    function nextStep() {
      currentStep = (currentStep + 1) % 3;
      updateView();
    }

    function toggleAutoPlay() {
      isPlaying = !isPlaying;
      btnPlay.textContent = isPlaying ? '⏸' : '▶';
      if (isPlaying) {
        startTimer();
      } else {
        clearInterval(timer);
      }
    }

    function startTimer() {
      clearInterval(timer);
      timer = setInterval(() => {
        if (isPlaying) nextStep();
      }, 3500);
    }

    // Initialize
    updateView();
    startTimer();
  </script>
</body>
</html>

OGE.6.W.8

Aligned learning resources

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