<!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;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 12px;
      user-select: none;
    }
    .diagram-wrap {
      width: 100%;
      max-width: 480px;
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    svg {
      width: 100%;
      height: auto;
      overflow: visible;
    }
    .match-line {
      stroke: #94a3b8;
      stroke-width: 3;
      stroke-dasharray: 6, 6;
      transition: stroke 0.3s ease, stroke-width 0.3s ease;
    }
    .pair-group {
      cursor: pointer;
    }
    .pair-group:hover .match-line,
    .pair-group.active .match-line {
      stroke: #6366f1;
      stroke-width: 4;
      stroke-dasharray: 4, 4;
    }
    .star-shape {
      fill: #fbbf24;
      stroke: #d97706;
      stroke-width: 2;
      transition: transform 0.2s ease;
    }
    .heart-shape {
      fill: #f87171;
      stroke: #dc2626;
      stroke-width: 1.5;
      transition: transform 0.2s ease;
    }
    .tag {
      font-size: 13px;
      font-weight: 700;
      fill: #64748b;
    }
    .badge {
      margin-top: 10px;
      background: #ecfdf5;
      border: 1.5px solid #a7f3d0;
      color: #065f46;
      font-size: 15px;
      font-weight: 700;
      padding: 10px 18px;
      border-radius: 999px;
      text-align: center;
      box-shadow: 0 2px 6px rgba(16, 185, 129, 0.1);
    }
  </style>
</head>
<body>

  <div class="diagram-wrap">
    <svg viewBox="0 0 460 250">
      
      <g class="pair-group" data-pair="1">
        <line class="match-line" x1="70" y1="65" x2="175" y2="185" />
        <g transform="translate(70, 50)">
          <polygon class="star-shape" points="0,-24 7,-8 24,-7 11,4 15,21 0,12 -15,21 -11,4 -24,-7 -7,-8" />
        </g>
        <g transform="translate(175, 195)">
          <path class="heart-shape" d="M0,8 C-10,-2 -15,-12 -7,-17 C-1,-20 0,-13 0,-11 C0,-13 1,-20 7,-17 C15,-12 10,-2 0,8 Z" transform="scale(1.15)" />
        </g>
      </g>

      
      <g class="pair-group" data-pair="2">
        <line class="match-line" x1="230" y1="65" x2="230" y2="185" />
        <g transform="translate(230, 50)">
          <polygon class="star-shape" points="0,-24 7,-8 24,-7 11,4 15,21 0,12 -15,21 -11,4 -24,-7 -7,-8" />
        </g>
        <g transform="translate(230, 195)">
          <path class="heart-shape" d="M0,8 C-10,-2 -15,-12 -7,-17 C-1,-20 0,-13 0,-11 C0,-13 1,-20 7,-17 C15,-12 10,-2 0,8 Z" transform="scale(1.15)" />
        </g>
      </g>

      
      <g class="pair-group" data-pair="3">
        <line class="match-line" x1="390" y1="65" x2="285" y2="185" />
        <g transform="translate(390, 50)">
          <polygon class="star-shape" points="0,-24 7,-8 24,-7 11,4 15,21 0,12 -15,21 -11,4 -24,-7 -7,-8" />
        </g>
        <g transform="translate(285, 195)">
          <path class="heart-shape" d="M0,8 C-10,-2 -15,-12 -7,-17 C-1,-20 0,-13 0,-11 C0,-13 1,-20 7,-17 C15,-12 10,-2 0,8 Z" transform="scale(1.15)" />
        </g>
      </g>

      
      <text x="230" y="16" text-anchor="middle" class="tag">Spread Out (3 Stars)</text>
      <text x="230" y="242" text-anchor="middle" class="tag">Close Together (3 Hearts)</text>
    </svg>

    <div class="badge">
      3 stars and 3 hearts — they are equal!
    </div>
  </div>

  <script>
    function playTone(freq) {
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.type = 'sine';
        osc.frequency.value = freq;
        gain.gain.setValueAtTime(0.2, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.3);
        osc.connect(gain);
        gain.connect(ctx.destination);
        osc.start();
        osc.stop(ctx.currentTime + 0.3);
      } catch (e) {}
    }

    const tones = [523.25, 659.25, 783.99]; // C5, E5, G5
    document.querySelectorAll('.pair-group').forEach((el, i) => {
      el.addEventListener('click', () => {
        el.classList.toggle('active');
        playTone(tones[i]);
      });
    });
  </script>
</body>
</html>

Comparing Two Sets Using Matching Strategies

<!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>Matching Sets</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 16px 12px;
      user-select: none;
    }

    .board {
      width: 100%;
      max-width: 420px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      width: 100%;
    }

    .column {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #ffffff;
      padding: 14px 8px;
      border-radius: 16px;
      border: 2px solid #e2e8f0;
      transition: border-color 0.3s ease, box-shadow 0.3s ease;
      cursor: pointer;
    }

    .column.active {
      border-color: #38bdf8;
      box-shadow: 0 4px 12px rgba(56, 189, 248, 0.15);
    }

    .item {
      width: 64px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 38px;
      position: relative;
    }

    .frog {
      transition: transform 0.3s ease;
    }

    .column.active .frog {
      transform: translateY(-2px);
    }

    .pad-container {
      width: 64px;
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .lily-pad {
      width: 52px;
      height: 52px;
      background: #86efac;
      border: 3px solid #22c55e;
      border-radius: 50%;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.08);
      transition: background-color 0.3s ease;
    }

    .lily-pad::after {
      content: '';
      position: absolute;
      top: 50%;
      right: 0;
      width: 42%;
      height: 6px;
      background: #ffffff;
      transform: translateY(-50%);
      clip-path: polygon(0 50%, 100% 0, 100% 100%);
    }

    .column.active .lily-pad {
      background: #4ade80;
    }

    .connector-box {
      height: 48px;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .line {
      width: 4px;
      height: 100%;
      background: #cbd5e1;
      border-radius: 4px;
      transition: background-color 0.3s ease;
    }

    .column.active .line {
      background: #0284c7;
      box-shadow: 0 0 8px rgba(2, 132, 199, 0.4);
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #dcfce7;
      color: #15803d;
      border: 2px solid #86efac;
      padding: 8px 16px;
      border-radius: 9999px;
      font-weight: 700;
      font-size: 15px;
      letter-spacing: 0.2px;
      transition: opacity 0.3s ease, transform 0.3s ease;
    }

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

    .step-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #475569;
      font-size: 13px;
      font-weight: 600;
      padding: 6px 12px;
      border-radius: 8px;
      cursor: pointer;
      transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }

    .step-btn.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
    }

    .step-btn:hover:not(.active) {
      background: #e2e8f0;
    }
  </style>
</head>
<body>
  <div class="board">
    <div class="grid">
      
      <div class="column active" id="col-0" onclick="togglePair(0)">
        <div class="item frog">🐸</div>
        <div class="connector-box">
          <div class="line"></div>
        </div>
        <div class="item pad-container">
          <div class="lily-pad"></div>
        </div>
      </div>

      
      <div class="column active" id="col-1" onclick="togglePair(1)">
        <div class="item frog">🐸</div>
        <div class="connector-box">
          <div class="line"></div>
        </div>
        <div class="item pad-container">
          <div class="lily-pad"></div>
        </div>
      </div>

      
      <div class="column active" id="col-2" onclick="togglePair(2)">
        <div class="item frog">🐸</div>
        <div class="connector-box">
          <div class="line"></div>
        </div>
        <div class="item pad-container">
          <div class="lily-pad"></div>
        </div>
      </div>
    </div>

    <div class="badge" id="statusBadge">
      <span>✓</span> All paired! Same amount!
    </div>

    <div class="controls">
      <button class="step-btn" id="btn-1" onclick="setPairs(1)">1 Pair</button>
      <button class="step-btn" id="btn-2" onclick="setPairs(2)">2 Pairs</button>
      <button class="step-btn active" id="btn-3" onclick="setPairs(3)">All 3</button>
    </div>
  </div>

  <script>
    let activeCount = 3;

    function render() {
      for (let i = 0; i < 3; i++) {
        const col = document.getElementById(`col-${i}`);
        if (i < activeCount) {
          col.classList.add('active');
        } else {
          col.classList.remove('active');
        }
      }

      for (let i = 1; i <= 3; i++) {
        const btn = document.getElementById(`btn-${i}`);
        btn.classList.toggle('active', activeCount === i);
      }

      const badge = document.getElementById('statusBadge');
      if (activeCount === 3) {
        badge.innerHTML = '<span>✓</span> All paired! Same amount!';
        badge.style.opacity = '1';
        badge.style.transform = 'scale(1)';
      } else {
        badge.innerHTML = `<span>🔗</span> ${activeCount} of 3 paired`;
        badge.style.opacity = '0.9';
        badge.style.transform = 'scale(0.98)';
      }
    }

    function setPairs(count) {
      activeCount = count;
      render();
    }

    function togglePair(index) {
      if (activeCount === index + 1) {
        activeCount = index;
      } else {
        activeCount = index + 1;
      }
      render();
    }

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

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #fcfaf6;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      padding: 16px;
      user-select: none;
      -webkit-user-select: none;
    }

    .board {
      width: 100%;
      max-width: 440px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0;
    }

    .row-container {
      width: 100%;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
    }

    .slot {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .item-card {
      width: 60px;
      height: 60px;
      border-radius: 16px;
      background: #ffffff;
      border: 2px solid #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 30px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
      transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
      position: relative;
    }

    /* Extra 4th bunny highlight */
    .slot.extra .item-card {
      background: #fef9c3;
      border-color: #facc15;
      box-shadow: 0 0 0 3px rgba(250, 204, 21, 0.35);
    }

    .badge-extra {
      position: absolute;
      top: -10px;
      background: #eab308;
      color: #ffffff;
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.5px;
      padding: 2px 8px;
      border-radius: 10px;
      box-shadow: 0 2px 5px rgba(234, 179, 8, 0.35);
      z-index: 5;
      white-space: nowrap;
    }

    /* Connecting lines precisely between rows */
    .connectors-layer {
      width: 100%;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
      height: 36px;
    }

    .line-box {
      display: flex;
      align-items: center;
      justify-content: center;
      height: 100%;
    }

    .line-svg {
      width: 8px;
      height: 100%;
      display: block;
    }

    .empty-slot {
      width: 60px;
      height: 60px;
      border-radius: 16px;
      border: 2px dashed #cbd5e1;
      background: rgba(241, 245, 249, 0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #94a3b8;
      font-size: 18px;
      font-weight: bold;
    }

    .summary-tag {
      margin-top: 20px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 15px;
      font-weight: 700;
      color: #1e2945;
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      padding: 7px 18px;
      border-radius: 24px;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.04);
    }

    .pair-highlight .item-card {
      border-color: #8b5cf6 !important;
      background-color: #f5f3ff !important;
      box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2) !important;
    }

    .pair-highlight line {
      stroke: #7c3aed;
      stroke-width: 3.5;
    }

    .interactive-col {
      cursor: pointer;
    }

    @media (max-width: 380px) {
      .item-card, .empty-slot {
        width: 50px;
        height: 50px;
        font-size: 24px;
        border-radius: 13px;
      }
      .connectors-layer {
        height: 28px;
      }
      .row-container, .connectors-layer {
        gap: 8px;
      }
      .summary-tag {
        font-size: 13px;
        padding: 5px 14px;
        margin-top: 16px;
      }
      .badge-extra {
        font-size: 10px;
        padding: 1px 6px;
        top: -8px;
      }
    }
  </style>
</head>
<body>

  <div class="board">
    
    <div class="row-container">
      <div class="slot interactive-col" data-pair="1" title="Matched Pair 1">
        <div class="item-card">🐰</div>
      </div>
      <div class="slot interactive-col" data-pair="2" title="Matched Pair 2">
        <div class="item-card">🐰</div>
      </div>
      <div class="slot interactive-col" data-pair="3" title="Matched Pair 3">
        <div class="item-card">🐰</div>
      </div>
      <div class="slot extra" title="Extra Bunny">
        <span class="badge-extra">Extra!</span>
        <div class="item-card">🐰</div>
      </div>
    </div>

    
    <div class="connectors-layer">
      <div class="line-box interactive-col" data-pair="1">
        <svg class="line-svg" viewBox="0 0 6 36" preserveAspectRatio="none">
          <line x1="3" y1="0" x2="3" y2="36" stroke="#8b5cf6" stroke-width="2.5" stroke-dasharray="4 3" stroke-linecap="round"/>
        </svg>
      </div>
      <div class="line-box interactive-col" data-pair="2">
        <svg class="line-svg" viewBox="0 0 6 36" preserveAspectRatio="none">
          <line x1="3" y1="0" x2="3" y2="36" stroke="#8b5cf6" stroke-width="2.5" stroke-dasharray="4 3" stroke-linecap="round"/>
        </svg>
      </div>
      <div class="line-box interactive-col" data-pair="3">
        <svg class="line-svg" viewBox="0 0 6 36" preserveAspectRatio="none">
          <line x1="3" y1="0" x2="3" y2="36" stroke="#8b5cf6" stroke-width="2.5" stroke-dasharray="4 3" stroke-linecap="round"/>
        </svg>
      </div>
      <div class="line-box">
        
      </div>
    </div>

    
    <div class="row-container">
      <div class="slot interactive-col" data-pair="1" title="Matched Pair 1">
        <div class="item-card">🥕</div>
      </div>
      <div class="slot interactive-col" data-pair="2" title="Matched Pair 2">
        <div class="item-card">🥕</div>
      </div>
      <div class="slot interactive-col" data-pair="3" title="Matched Pair 3">
        <div class="item-card">🥕</div>
      </div>
      <div class="slot" title="No carrot available">
        <div class="empty-slot" aria-label="No match">✕</div>
      </div>
    </div>

    
    <div class="summary-tag">
      <span>4 Bunnies</span>
      <span style="color:#8b5cf6; font-size:16px; font-weight:800;">&gt;</span>
      <span>3 Carrots</span>
    </div>
  </div>

  <script>
    document.querySelectorAll('.interactive-col').forEach(el => {
      const pairId = el.getAttribute('data-pair');
      if (!pairId) return;

      const setHighlight = (state) => {
        document.querySelectorAll(`.interactive-col[data-pair="${pairId}"]`).forEach(target => {
          if (state) {
            target.classList.add('pair-highlight');
          } else {
            target.classList.remove('pair-highlight');
          }
        });
      };

      el.addEventListener('mouseenter', () => setHighlight(true));
      el.addEventListener('mouseleave', () => setHighlight(false));
      el.addEventListener('touchstart', (e) => {
        const isHighlighted = el.classList.contains('pair-highlight');
        document.querySelectorAll('.pair-highlight').forEach(n => n.classList.remove('pair-highlight'));
        if (!isHighlighted) setHighlight(true);
      }, { passive: true });
    });
  </script>
</body>
</html>

OGM.0.CC.6

Aligned learning resources

Related diagrams