<!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: #ffffff;
      color: #1e2945;
      padding: 12px 16px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      user-select: none;
    }

    .stack {
      display: flex;
      flex-direction: column;
      gap: 8px;
      width: 100%;
      max-width: 480px;
    }

    .row-card {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 6px 12px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      cursor: pointer;
      transition: background 0.2s ease, box-shadow 0.2s ease;
    }

    .row-card:hover {
      background: #f1f5f9;
    }

    .row-card.active {
      background: #ffffff;
      border-color: #cbd5e1;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    }

    /* Ten-Frame Grid */
    .ten-frame {
      display: grid;
      grid-template-columns: repeat(5, 18px);
      grid-template-rows: repeat(2, 18px);
      gap: 2px;
      background: #cbd5e1;
      padding: 2px;
      border-radius: 6px;
      border: 1.5px solid #94a3b8;
    }

    .cell {
      background: #ffffff;
      border-radius: 3px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .dot {
      width: 13px;
      height: 13px;
      border-radius: 50%;
      transition: transform 0.2s ease;
    }

    .row-card.active .dot {
      transform: scale(1.1);
    }

    .dot.red {
      background: #f43f5e;
      box-shadow: inset 0 -1px 2px rgba(0,0,0,0.25);
    }

    .dot.blue {
      background: #0ea5e9;
      box-shadow: inset 0 -1px 2px rgba(0,0,0,0.25);
    }

    /* Equation Display */
    .equation {
      font-size: 19px;
      font-weight: 700;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
      min-width: 110px;
    }

    .num-red { color: #e11d48; }
    .num-blue { color: #0284c7; }
    .op { color: #64748b; font-weight: 600; }
    .total { color: #0f172a; }

    /* Badge Area */
    .meta-col {
      width: 140px;
      display: flex;
      justify-content: flex-end;
      align-items: center;
    }

    .badge-double {
      background: #fef3c7;
      color: #92400e;
      border: 1px solid #fcd34d;
      padding: 4px 8px;
      border-radius: 999px;
      font-size: 12px;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      animation: gentle-glow 2s infinite alternate ease-in-out;
    }

    @keyframes gentle-glow {
      0% { box-shadow: 0 0 4px rgba(245, 158, 11, 0.2); }
      100% { box-shadow: 0 0 10px rgba(245, 158, 11, 0.6); }
    }

    @media (max-width: 400px) {
      .equation { font-size: 16px; min-width: 90px; }
      .meta-col { width: 105px; }
      .badge-double { font-size: 11px; padding: 2px 6px; }
      .ten-frame {
        grid-template-columns: repeat(5, 15px);
        grid-template-rows: repeat(2, 15px);
      }
      .dot { width: 11px; height: 11px; }
    }
  </style>
</head>
<body>

  <div class="stack" id="stack">
    
    <div class="row-card" data-r="0" data-b="10">
      <div class="ten-frame" data-red="0"></div>
      <div class="equation">
        <span class="num-red">0</span><span class="op">+</span><span class="num-blue">10</span><span class="op">=</span><span class="total">10</span>
      </div>
      <div class="meta-col"></div>
    </div>

    
    <div class="row-card" data-r="1" data-b="9">
      <div class="ten-frame" data-red="1"></div>
      <div class="equation">
        <span class="num-red">1</span><span class="op">+</span><span class="num-blue">9</span><span class="op">=</span><span class="total">10</span>
      </div>
      <div class="meta-col"></div>
    </div>

    
    <div class="row-card" data-r="2" data-b="8">
      <div class="ten-frame" data-red="2"></div>
      <div class="equation">
        <span class="num-red">2</span><span class="op">+</span><span class="num-blue">8</span><span class="op">=</span><span class="total">10</span>
      </div>
      <div class="meta-col"></div>
    </div>

    
    <div class="row-card" data-r="3" data-b="7">
      <div class="ten-frame" data-red="3"></div>
      <div class="equation">
        <span class="num-red">3</span><span class="op">+</span><span class="num-blue">7</span><span class="op">=</span><span class="total">10</span>
      </div>
      <div class="meta-col"></div>
    </div>

    
    <div class="row-card" data-r="4" data-b="6">
      <div class="ten-frame" data-red="4"></div>
      <div class="equation">
        <span class="num-red">4</span><span class="op">+</span><span class="num-blue">6</span><span class="op">=</span><span class="total">10</span>
      </div>
      <div class="meta-col"></div>
    </div>

    
    <div class="row-card active" data-r="5" data-b="5">
      <div class="ten-frame" data-red="5"></div>
      <div class="equation">
        <span class="num-red">5</span><span class="op">+</span><span class="num-blue">5</span><span class="op">=</span><span class="total">10</span>
      </div>
      <div class="meta-col">
        <span class="badge-double">✦ 5 + 5 is a double!</span>
      </div>
    </div>
  </div>

  <script>
    // Build ten-frame cells
    document.querySelectorAll('.ten-frame').forEach(frame => {
      const redCount = parseInt(frame.getAttribute('data-red'), 10);
      for (let i = 0; i < 10; i++) {
        const cell = document.createElement('div');
        cell.className = 'cell';
        const dot = document.createElement('div');
        dot.className = 'dot ' + (i < redCount ? 'red' : 'blue');
        cell.appendChild(dot);
        frame.appendChild(cell);
      }
    });

    // Sound synthesis on tap
    function playTone(freq, dur = 0.15) {
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.type = 'sine';
        osc.frequency.setValueAtTime(freq, ctx.currentTime);
        gain.gain.setValueAtTime(0.12, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + dur);
        osc.connect(gain);
        gain.connect(ctx.destination);
        osc.start();
        osc.stop(ctx.currentTime + dur);
      } catch (e) {}
    }

    const rows = document.querySelectorAll('.row-card');
    rows.forEach((row, idx) => {
      row.addEventListener('click', () => {
        rows.forEach(r => r.classList.remove('active'));
        row.classList.add('active');
        playTone(330 + idx * 55);
      });
    });
  </script>
</body>
</html>

Finding Number Pairs That Make Ten

<!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>Turnaround Twins</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: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 12px;
      user-select: none;
      -webkit-user-select: none;
    }

    .stage {
      width: 100%;
      max-width: 580px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
    }

    .cards-row {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      position: relative;
    }

    .frame-card {
      flex: 1;
      max-width: 220px;
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 14px;
      padding: 12px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
      cursor: pointer;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .frame-card:hover, .frame-card.active {
      border-color: #22b7ff;
      box-shadow: 0 6px 16px rgba(34, 183, 255, 0.18);
    }

    .ten-frame {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      grid-template-rows: repeat(2, 1fr);
      gap: 4px;
      background: #f1f5f9;
      padding: 6px;
      border-radius: 8px;
      border: 2px solid #cbd5e1;
      width: 100%;
      aspect-ratio: 5 / 2;
    }

    .cell {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .dot {
      width: 80%;
      height: 80%;
      border-radius: 50%;
      transition: transform 0.3s ease, background-color 0.3s ease;
    }

    .dot.red {
      background: #ef4444;
      box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.15);
    }

    .dot.blue {
      background: #3b82f6;
      box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.15);
    }

    .equation {
      font-size: 19px;
      font-weight: 800;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .num-red { color: #ef4444; }
    .num-blue { color: #3b82f6; }
    .num-total { color: #0f172a; }

    .connector {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-width: 90px;
      flex-shrink: 0;
      text-align: center;
    }

    .arrow-svg {
      width: 70px;
      height: 32px;
    }

    .badge {
      background: #e0f2fe;
      color: #0369a1;
      font-size: 11px;
      font-weight: 800;
      padding: 4px 8px;
      border-radius: 12px;
      white-space: nowrap;
      margin-top: 2px;
      border: 1px solid #bae6fd;
    }

    .btn-action {
      background: #22b7ff;
      color: #ffffff;
      border: none;
      border-radius: 20px;
      padding: 8px 18px;
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 3px 8px rgba(34, 183, 255, 0.3);
      transition: opacity 0.2s ease, transform 0.1s ease;
    }

    .btn-action:active {
      opacity: 0.9;
    }

    @keyframes pop {
      0% { transform: scale(1); }
      50% { transform: scale(1.15); }
      100% { transform: scale(1); }
    }

    .popping .dot {
      animation: pop 0.35s ease;
    }

    @media (max-width: 400px) {
      .frame-card {
        padding: 8px 6px;
        gap: 6px;
      }
      .equation {
        font-size: 16px;
      }
      .connector {
        min-width: 72px;
      }
      .arrow-svg {
        width: 54px;
        height: 26px;
      }
      .badge {
        font-size: 10px;
        padding: 3px 6px;
      }
    }
  </style>
</head>
<body>
  <div class="stage">
    <div class="cards-row">
      
      <div class="frame-card" id="cardLeft">
        <div class="ten-frame" id="frameLeft"></div>
        <div class="equation">
          <span class="num-red">2</span>
          <span>+</span>
          <span class="num-blue">8</span>
          <span>=</span>
          <span class="num-total">10</span>
        </div>
      </div>

      
      <div class="connector">
        <svg class="arrow-svg" viewBox="0 0 80 36" fill="none">
          <path d="M 12 12 Q 40 4 68 12" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round" fill="none"/>
          <path d="M 60 7 L 70 12 L 62 18" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" fill="none"/>
          <path d="M 68 24 Q 40 32 12 24" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round" fill="none"/>
          <path d="M 20 29 L 10 24 L 18 18" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round" fill="none"/>
        </svg>
        <span class="badge">Turnaround Twin!</span>
      </div>

      
      <div class="frame-card" id="cardRight">
        <div class="ten-frame" id="frameRight"></div>
        <div class="equation">
          <span class="num-red">8</span>
          <span>+</span>
          <span class="num-blue">2</span>
          <span>=</span>
          <span class="num-total">10</span>
        </div>
      </div>
    </div>

    <button class="btn-action" id="swapBtn">
      <span>Turn Around ⇄</span>
    </button>
  </div>

  <script>
    const frameLeft = document.getElementById('frameLeft');
    const frameRight = document.getElementById('frameRight');
    const cardLeft = document.getElementById('cardLeft');
    const cardRight = document.getElementById('cardRight');
    const swapBtn = document.getElementById('swapBtn');

    function buildFrame(container, redCount, blueCount) {
      container.innerHTML = '';
      for (let i = 0; i < 10; i++) {
        const cell = document.createElement('div');
        cell.className = 'cell';
        const dot = document.createElement('div');
        dot.className = 'dot ' + (i < redCount ? 'red' : 'blue');
        cell.appendChild(dot);
        container.appendChild(cell);
      }
    }

    buildFrame(frameLeft, 2, 8);
    buildFrame(frameRight, 8, 2);

    function playTone(freq, dur = 0.15) {
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.frequency.setValueAtTime(freq, ctx.currentTime);
        osc.connect(gain);
        gain.connect(ctx.destination);
        gain.gain.setValueAtTime(0.12, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + dur);
        osc.start();
        osc.stop(ctx.currentTime + dur);
      } catch (e) {}
    }

    function triggerSwap() {
      cardLeft.classList.add('popping');
      cardRight.classList.add('popping');
      playTone(523.25);
      setTimeout(() => playTone(659.25), 100);

      setTimeout(() => {
        cardLeft.classList.remove('popping');
        cardRight.classList.remove('popping');
      }, 400);
    }

    swapBtn.addEventListener('click', triggerSwap);
    cardLeft.addEventListener('click', triggerSwap);
    cardRight.addEventListener('click', triggerSwap);
  </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="1:1">
  <title>Ten-Frame</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

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

    .header-badge {
      display: inline-flex;
      align-items: center;
      background: #f0f9ff;
      color: #0284c7;
      font-size: 15px;
      font-weight: 700;
      padding: 6px 16px;
      border-radius: 20px;
      border: 1px solid #bae6fd;
      margin-bottom: 18px;
    }

    .ten-frame-container {
      width: 100%;
      max-width: 380px;
      background: #ffffff;
      border: 2.5px solid #cbd5e1;
      border-radius: 14px;
      padding: 8px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    }

    .frame-row {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 6px;
    }

    .frame-row + .frame-row {
      margin-top: 6px;
    }

    .cell {
      aspect-ratio: 1 / 1;
      border: 2px dashed #cbd5e1;
      border-radius: 10px;
      background: #f8fafc;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: background-color 0.2s ease, border-color 0.2s ease;
    }

    .cell:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }

    .token {
      width: 72%;
      height: 72%;
      border-radius: 50%;
      background: #22b7ff;
      box-shadow: 0 2px 6px rgba(34, 183, 255, 0.4);
      opacity: 0;
      transform: scale(0.4);
      transition: opacity 0.2s cubic-bezier(0.34, 1.56, 0.64, 1),
                  transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    .cell.active {
      border-style: solid;
      border-color: #7dd3fc;
      background: #f0f9ff;
    }

    .cell.active .token {
      opacity: 1;
      transform: scale(1);
    }

    .sub-structure {
      margin-top: 20px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .dot-row {
      display: flex;
      gap: 10px;
    }

    .dot-outline {
      width: 14px;
      height: 14px;
      border-radius: 50%;
      border: 2px solid #cbd5e1;
      background: #ffffff;
      transition: background-color 0.2s ease, border-color 0.2s ease;
    }

    .dot-outline.filled {
      background: #22b7ff;
      border-color: #22b7ff;
    }

    .structure-label {
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      margin-top: 4px;
      letter-spacing: 0.5px;
    }
  </style>
</head>
<body>

  <div class="header-badge">Ten-Frame (10 spots)</div>

  <div class="ten-frame-container" id="frame">
    <div class="frame-row">
      <div class="cell" data-idx="0"><div class="token"></div></div>
      <div class="cell" data-idx="1"><div class="token"></div></div>
      <div class="cell" data-idx="2"><div class="token"></div></div>
      <div class="cell" data-idx="3"><div class="token"></div></div>
      <div class="cell" data-idx="4"><div class="token"></div></div>
    </div>
    <div class="frame-row">
      <div class="cell" data-idx="5"><div class="token"></div></div>
      <div class="cell" data-idx="6"><div class="token"></div></div>
      <div class="cell" data-idx="7"><div class="token"></div></div>
      <div class="cell" data-idx="8"><div class="token"></div></div>
      <div class="cell" data-idx="9"><div class="token"></div></div>
    </div>
  </div>

  <div class="sub-structure">
    <div class="dot-row">
      <div class="dot-outline" id="dot-0"></div>
      <div class="dot-outline" id="dot-1"></div>
      <div class="dot-outline" id="dot-2"></div>
      <div class="dot-outline" id="dot-3"></div>
      <div class="dot-outline" id="dot-4"></div>
    </div>
    <div class="dot-row">
      <div class="dot-outline" id="dot-5"></div>
      <div class="dot-outline" id="dot-6"></div>
      <div class="dot-outline" id="dot-7"></div>
      <div class="dot-outline" id="dot-8"></div>
      <div class="dot-outline" id="dot-9"></div>
    </div>
    <div class="structure-label">5 and 5 Structure</div>
  </div>

  <script>
    const cells = document.querySelectorAll('.cell');
    const dots = document.querySelectorAll('.dot-outline');

    cells.forEach(cell => {
      cell.addEventListener('click', () => {
        cell.classList.toggle('active');
        const idx = cell.getAttribute('data-idx');
        if (dots[idx]) {
          dots[idx].classList.toggle('filled', cell.classList.contains('active'));
        }
      });
    });
  </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;
      user-select: none;
      -webkit-user-select: none;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 16px;
      gap: 18px;
    }

    /* Ten Frame Styling */
    .ten-frame-container {
      width: 100%;
      max-width: 440px;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .ten-frame {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      grid-template-rows: repeat(2, 1fr);
      gap: 4px;
      background: #334155;
      border: 4px solid #334155;
      border-radius: 12px;
      padding: 4px;
      width: 100%;
      aspect-ratio: 5 / 2.1;
      box-shadow: 0 4px 12px rgba(30, 41, 69, 0.08);
    }

    .cell {
      background: #f8fafc;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    /* Counters */
    .counter {
      width: 72%;
      height: 72%;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.1rem;
      color: #ffffff;
      transition: transform 0.25s ease, opacity 0.25s ease, box-shadow 0.25s ease;
      cursor: pointer;
    }

    .counter.red {
      background: radial-gradient(circle at 35% 35%, #ef4444, #b91c1c);
      box-shadow: 0 3px 6px rgba(185, 28, 28, 0.35);
    }

    .counter.blue {
      background: radial-gradient(circle at 35% 35%, #3b82f6, #1d4ed8);
      box-shadow: 0 3px 6px rgba(29, 78, 216, 0.35);
    }

    .counter.dimmed {
      opacity: 0.25;
      transform: scale(0.9);
      box-shadow: none;
    }

    .counter.highlight {
      transform: scale(1.08);
    }

    .counter.red.highlight {
      box-shadow: 0 0 0 3px #ffffff, 0 0 0 6px #dc2626;
    }

    .counter.blue.highlight {
      box-shadow: 0 0 0 3px #ffffff, 0 0 0 6px #2563eb;
    }

    /* Equation Display */
    .equation-box {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 8px;
      font-size: clamp(1.2rem, 4.5vw, 1.65rem);
      font-weight: 800;
      text-align: center;
      padding: 6px 16px;
    }

    .part {
      display: inline-flex;
      align-items: baseline;
      gap: 4px;
      padding: 4px 8px;
      border-radius: 8px;
      cursor: pointer;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    .part:hover {
      background: #f1f5f9;
    }

    .part.active {
      background: #e2e8f0;
    }

    .crimson-text {
      color: #dc2626;
    }

    .blue-text {
      color: #2563eb;
    }

    .slate-text {
      color: #1e2945;
    }

    .op {
      color: #64748b;
      font-weight: 700;
    }

    /* Mode Buttons */
    .btn-group {
      display: flex;
      gap: 8px;
    }

    .btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #334155;
      font-size: 13px;
      font-weight: 700;
      padding: 6px 14px;
      border-radius: 20px;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .btn.active-all {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
    }

    .btn.active-red {
      background: #dc2626;
      color: #ffffff;
      border-color: #dc2626;
    }

    .btn.active-blue {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
    }
  </style>
</head>
<body>

  <div class="ten-frame-container">
    <div class="ten-frame" id="tenFrame">
      
      <div class="cell"><div class="counter red" data-group="red" data-index="1">1</div></div>
      <div class="cell"><div class="counter red" data-group="red" data-index="2">2</div></div>
      <div class="cell"><div class="counter red" data-group="red" data-index="3">3</div></div>
      <div class="cell"><div class="counter red" data-group="red" data-index="4">4</div></div>
      <div class="cell"><div class="counter red" data-group="red" data-index="5">5</div></div>

      
      <div class="cell"><div class="counter red" data-group="red" data-index="6">6</div></div>
      <div class="cell"><div class="counter red" data-group="red" data-index="7">7</div></div>
      <div class="cell"><div class="counter blue" data-group="blue" data-index="1">1</div></div>
      <div class="cell"><div class="counter blue" data-group="blue" data-index="2">2</div></div>
      <div class="cell"><div class="counter blue" data-group="blue" data-index="3">3</div></div>
    </div>
  </div>

  <div class="equation-box">
    <span class="part crimson-text" id="partRed"><span class="crimson-text">7</span> red</span>
    <span class="op">+</span>
    <span class="part blue-text" id="partBlue"><span class="blue-text">3</span> blue</span>
    <span class="op">=</span>
    <span class="part slate-text" id="partTotal"><span class="slate-text">10</span> counters</span>
  </div>

  <div class="btn-group">
    <button class="btn active-all" id="btnAll">All 10</button>
    <button class="btn" id="btnRed">7 Red</button>
    <button class="btn" id="btnBlue">3 Blue</button>
  </div>

  <script>
    const counters = document.querySelectorAll('.counter');
    const btnAll = document.getElementById('btnAll');
    const btnRed = document.getElementById('btnRed');
    const btnBlue = document.getElementById('btnBlue');
    const partRed = document.getElementById('partRed');
    const partBlue = document.getElementById('partBlue');
    const partTotal = document.getElementById('partTotal');

    function setFocus(mode) {
      // Reset button classes
      btnAll.className = 'btn' + (mode === 'all' ? ' active-all' : '');
      btnRed.className = 'btn' + (mode === 'red' ? ' active-red' : '');
      btnBlue.className = 'btn' + (mode === 'blue' ? ' active-blue' : '');

      // Reset part active states
      partRed.classList.toggle('active', mode === 'red');
      partBlue.classList.toggle('active', mode === 'blue');
      partTotal.classList.toggle('active', mode === 'all');

      // Update counters
      counters.forEach(c => {
        const group = c.getAttribute('data-group');
        c.classList.remove('dimmed', 'highlight');

        if (mode === 'all') {
          // Normal active state
        } else if (mode === group) {
          c.classList.add('highlight');
        } else {
          c.classList.add('dimmed');
        }
      });
    }

    btnAll.addEventListener('click', () => setFocus('all'));
    btnRed.addEventListener('click', () => setFocus('red'));
    btnBlue.addEventListener('click', () => setFocus('blue'));

    partRed.addEventListener('click', () => setFocus('red'));
    partBlue.addEventListener('click', () => setFocus('blue'));
    partTotal.addEventListener('click', () => setFocus('all'));

    counters.forEach(c => {
      c.addEventListener('click', () => {
        const group = c.getAttribute('data-group');
        setFocus(group);
      });
    });
  </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;
      background: #f8fafc;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 100%;
      padding: 12px;
      user-select: none;
      -webkit-user-select: none;
    }

    .stand-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      width: 100%;
      max-width: 480px;
      align-items: end;
    }

    .category-box {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 16px;
      padding: 10px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      cursor: pointer;
    }

    .category-box.most {
      border-color: #ef4444;
      background: #fffafa;
      box-shadow: 0 4px 14px rgba(239, 68, 68, 0.12);
    }

    .category-box.least {
      border-color: #eab308;
      background: #fefdf6;
      box-shadow: 0 4px 14px rgba(234, 179, 8, 0.12);
    }

    .category-box.middle {
      border-color: #f97316;
      background: #fffaf5;
      box-shadow: 0 4px 14px rgba(249, 115, 22, 0.1);
    }

    .tag-badge {
      position: absolute;
      top: -11px;
      font-size: 11px;
      font-weight: 800;
      padding: 2px 8px;
      border-radius: 12px;
      letter-spacing: 0.3px;
      text-transform: uppercase;
      white-space: nowrap;
    }

    .tag-badge.most-tag {
      background: #ef4444;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(239, 68, 68, 0.35);
    }

    .tag-badge.least-tag {
      background: #eab308;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(234, 179, 8, 0.35);
    }

    .title {
      font-size: 14px;
      font-weight: 700;
      margin-top: 4px;
      margin-bottom: 8px;
      color: #334155;
    }

    .items-rack {
      display: flex;
      flex-direction: column-reverse;
      gap: 6px;
      width: 100%;
      align-items: center;
      padding: 6px 0;
      min-height: 180px;
      justify-content: flex-start;
    }

    .slot {
      width: 38px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      border-radius: 8px;
      background: rgba(0, 0, 0, 0.02);
      transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    .slot.empty {
      border: 1.5px dashed #e2e8f0;
      background: transparent;
    }

    .category-box:active .slot:not(.empty) {
      transform: scale(1.12);
    }

    .count-badge {
      margin-top: 8px;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      font-weight: 800;
      color: #ffffff;
    }

    .count-badge.red {
      background: #ef4444;
    }

    .count-badge.yellow {
      background: #eab308;
    }

    .count-badge.orange {
      background: #f97316;
    }

    @media (max-width: 360px) {
      .stand-grid {
        gap: 6px;
      }
      .category-box {
        padding: 8px 3px;
      }
      .title {
        font-size: 12px;
      }
      .slot {
        width: 32px;
        height: 28px;
        font-size: 20px;
      }
      .count-badge {
        width: 30px;
        height: 30px;
        font-size: 15px;
      }
      .tag-badge {
        font-size: 9px;
        padding: 1px 6px;
        top: -9px;
      }
    }
  </style>
</head>
<body>

  <div class="stand-grid">
    
    <div class="category-box most" onclick="pulse(this)">
      <div class="tag-badge most-tag">⭐ Most!</div>
      <div class="title">Apples</div>
      <div class="items-rack">
        <div class="slot">🍎</div>
        <div class="slot">🍎</div>
        <div class="slot">🍎</div>
        <div class="slot">🍎</div>
        <div class="slot">🍎</div>
      </div>
      <div class="count-badge red">5</div>
    </div>

    
    <div class="category-box least" onclick="pulse(this)">
      <div class="tag-badge least-tag">Least!</div>
      <div class="title">Bananas</div>
      <div class="items-rack">
        <div class="slot">🍌</div>
        <div class="slot">🍌</div>
        <div class="slot">🍌</div>
        <div class="slot empty"></div>
        <div class="slot empty"></div>
      </div>
      <div class="count-badge yellow">3</div>
    </div>

    
    <div class="category-box middle" onclick="pulse(this)">
      <div class="title">Oranges</div>
      <div class="items-rack">
        <div class="slot">🍊</div>
        <div class="slot">🍊</div>
        <div class="slot">🍊</div>
        <div class="slot">🍊</div>
        <div class="slot empty"></div>
      </div>
      <div class="count-badge orange">4</div>
    </div>
  </div>

  <script>
    function pulse(card) {
      card.querySelectorAll('.slot:not(.empty)').forEach((el, i) => {
        setTimeout(() => {
          el.style.transform = 'scale(1.22)';
          setTimeout(() => el.style.transform = '', 200);
        }, i * 45);
      });
    }
  </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, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      user-select: none;
    }

    .main-grid {
      display: flex;
      flex-direction: row;
      align-items: center;
      justify-content: center;
      gap: 8px;
      width: 100%;
      max-width: 600px;
    }

    /* Left: Messy Pile */
    .section-messy {
      flex: 1;
      background: #f8fafc;
      border: 2px dashed #cbd5e1;
      border-radius: 16px;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 220px;
    }

    .section-title {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #64748b;
      margin-bottom: 8px;
    }

    .messy-pile {
      position: relative;
      width: 100%;
      height: 170px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 4px;
    }

    .fruit-item {
      font-size: 26px;
      line-height: 1;
      transition: transform 0.25s ease, filter 0.25s ease, opacity 0.25s ease;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 38px;
      height: 38px;
      border-radius: 50%;
    }

    /* Arrow Divider */
    .arrow-container {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 0 2px;
    }

    .arrow-icon {
      font-size: 24px;
      color: #3b82f6;
      font-weight: 900;
    }

    .sort-label {
      font-size: 11px;
      font-weight: 800;
      color: #3b82f6;
      text-transform: uppercase;
      margin-top: -2px;
    }

    /* Right: Sorted Baskets */
    .section-sorted {
      flex: 1.4;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .basket-card {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-radius: 14px;
      padding: 6px 10px;
      border: 1.5px solid transparent;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      cursor: pointer;
    }

    .basket-card.apples {
      background: #fef2f2;
      border-color: #fecaca;
    }
    .basket-card.bananas {
      background: #fefce8;
      border-color: #fef08a;
    }
    .basket-card.strawberries {
      background: #fff1f2;
      border-color: #fecdd3;
    }

    .basket-info {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .basket-name {
      font-size: 13px;
      font-weight: 700;
      color: #334155;
    }

    .fruit-group {
      display: flex;
      align-items: center;
      gap: 2px;
      font-size: 20px;
    }

    .count-badge {
      width: 28px;
      height: 28px;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      font-weight: 800;
      color: #ffffff;
    }

    .apples .count-badge { background: #ef4444; }
    .bananas .count-badge { background: #eab308; }
    .strawberries .count-badge { background: #f43f5e; }

    /* Active Highlight States */
    .dimmed {
      opacity: 0.3;
      filter: grayscale(80%);
    }

    .highlighted {
      transform: scale(1.18);
      filter: drop-shadow(0 2px 6px rgba(0,0,0,0.15));
    }

    .basket-card.active {
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
      transform: scale(1.02);
    }

    /* Mobile Adaptations */
    @media (max-width: 440px) {
      .main-grid {
        flex-direction: column;
        gap: 6px;
      }
      .section-messy {
        width: 100%;
        min-height: auto;
        padding: 6px;
      }
      .messy-pile {
        height: auto;
        padding: 2px;
      }
      .arrow-container {
        flex-direction: row;
        gap: 6px;
      }
      .arrow-icon {
        transform: rotate(90deg);
      }
      .section-sorted {
        width: 100%;
      }
      .fruit-item {
        font-size: 22px;
        width: 32px;
        height: 32px;
      }
    }
  </style>
</head>
<body>

  <div class="main-grid">
    
    <div class="section-messy">
      <div class="section-title">Messy Data</div>
      <div class="messy-pile" id="messyPile">
        
        <span class="fruit-item" data-type="apple" style="transform: rotate(-12deg);">🍎</span>
        <span class="fruit-item" data-type="strawberry" style="transform: rotate(18deg);">🍓</span>
        <span class="fruit-item" data-type="banana" style="transform: rotate(-25deg);">🍌</span>
        <span class="fruit-item" data-type="strawberry" style="transform: rotate(-8deg);">🍓</span>
        <span class="fruit-item" data-type="apple" style="transform: rotate(15deg);">🍎</span>
        <span class="fruit-item" data-type="strawberry" style="transform: rotate(22deg);">🍓</span>
        <span class="fruit-item" data-type="banana" style="transform: rotate(10deg);">🍌</span>
        <span class="fruit-item" data-type="apple" style="transform: rotate(-20deg);">🍎</span>
        <span class="fruit-item" data-type="strawberry" style="transform: rotate(-14deg);">🍓</span>
      </div>
    </div>

    
    <div class="arrow-container">
      <div class="arrow-icon">➔</div>
      <div class="sort-label">Sort</div>
    </div>

    
    <div class="section-sorted">
      
      <div class="basket-card apples" data-type="apple">
        <div class="basket-info">
          <div class="fruit-group">
            <span>🍎</span><span>🍎</span><span>🍎</span>
          </div>
          <div class="basket-name">Apples</div>
        </div>
        <div class="count-badge">3</div>
      </div>

      
      <div class="basket-card bananas" data-type="banana">
        <div class="basket-info">
          <div class="fruit-group">
            <span>🍌</span><span>🍌</span>
          </div>
          <div class="basket-name">Bananas</div>
        </div>
        <div class="count-badge">2</div>
      </div>

      
      <div class="basket-card strawberries" data-type="strawberry">
        <div class="basket-info">
          <div class="fruit-group">
            <span>🍓</span><span>🍓</span><span>🍓</span><span>🍓</span>
          </div>
          <div class="basket-name">Strawberries</div>
        </div>
        <div class="count-badge">4</div>
      </div>
    </div>
  </div>

  <script>
    const fruitItems = document.querySelectorAll('.fruit-item');
    const basketCards = document.querySelectorAll('.basket-card');
    let activeFilter = null;

    function setFilter(type) {
      if (activeFilter === type) {
        activeFilter = null;
      } else {
        activeFilter = type;
      }

      // Update messy pile items
      fruitItems.forEach(item => {
        const itemType = item.getAttribute('data-type');
        if (!activeFilter) {
          item.classList.remove('dimmed', 'highlighted');
        } else if (itemType === activeFilter) {
          item.classList.remove('dimmed');
          item.classList.add('highlighted');
        } else {
          item.classList.remove('highlighted');
          item.classList.add('dimmed');
        }
      });

      // Update basket cards
      basketCards.forEach(card => {
        const cardType = card.getAttribute('data-type');
        if (!activeFilter) {
          card.classList.remove('dimmed', 'active');
        } else if (cardType === activeFilter) {
          card.classList.remove('dimmed');
          card.classList.add('active');
        } else {
          card.classList.remove('active');
          card.classList.add('dimmed');
        }
      });
    }

    fruitItems.forEach(el => {
      el.addEventListener('click', () => setFilter(el.getAttribute('data-type')));
    });

    basketCards.forEach(el => {
      el.addEventListener('click', () => setFilter(el.getAttribute('data-type')));
    });
  </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;
      background: transparent;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 16px;
      user-select: none;
      -webkit-user-select: none;
    }

    .sort-section {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .section-label {
      font-size: 14px;
      font-weight: 700;
      color: #475569;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .section-label span {
      background: #e2e8f0;
      color: #334155;
      padding: 2px 8px;
      border-radius: 6px;
    }

    .groups-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }

    .group-box {
      background: #f8fafc;
      border: 2px dashed #cbd5e1;
      border-radius: 12px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      min-height: 100px;
      justify-content: space-between;
    }

    .group-title {
      font-size: 15px;
      font-weight: 700;
    }

    /* Color category themes */
    .theme-green {
      background: #f0fdf4;
      border-color: #86efac;
    }
    .theme-green .group-title {
      color: #15803d;
    }

    .theme-purple {
      background: #faf5ff;
      border-color: #d8b4fe;
    }
    .theme-purple .group-title {
      color: #7e22ce;
    }

    /* Size category themes */
    .theme-big {
      background: #f1f5f9;
      border-color: #94a3b8;
    }
    .theme-big .group-title {
      color: #334155;
    }

    .theme-small {
      background: #f8fafc;
      border-color: #cbd5e1;
    }
    .theme-small .group-title {
      color: #64748b;
    }

    .buttons-container {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: center;
      gap: 10px;
      width: 100%;
      flex: 1;
    }

    /* SVG Button Tokens */
    .btn-item {
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      transition: filter 0.2s ease, box-shadow 0.2s ease;
    }

    .btn-item.active {
      filter: brightness(1.1);
      box-shadow: 0 0 0 3px #22b7ff, 0 4px 10px rgba(34, 183, 255, 0.35);
    }

    .btn-svg {
      display: block;
    }

    .btn-large {
      width: 44px;
      height: 44px;
    }

    .btn-small {
      width: 28px;
      height: 28px;
    }

    .green-fill { fill: #22c55e; }
    .green-border { stroke: #16a34a; }
    .green-rim { stroke: #4ade80; }
    .green-hole { fill: #14532d; }

    .purple-fill { fill: #a855f7; }
    .purple-border { stroke: #9333ea; }
    .purple-rim { stroke: #c084fc; }
    .purple-hole { fill: #581c87; }
  </style>
</head>
<body>

  
  <div class="sort-section">
    <div class="section-label">
      <span>Sorted by Color</span>
    </div>
    <div class="groups-row">
      
      <div class="group-box theme-green">
        <span class="group-title">Green</span>
        <div class="buttons-container">
          
          <div class="btn-item btn-large" data-id="1">
            <svg class="btn-svg" viewBox="0 0 44 44" width="44" height="44">
              <circle cx="22" cy="22" r="20" class="green-fill green-border" stroke-width="2.5"/>
              <circle cx="22" cy="22" r="14" fill="none" class="green-rim" stroke-width="1.5" stroke-dasharray="2,2"/>
              <circle cx="18" cy="18" r="2" class="green-hole"/>
              <circle cx="26" cy="18" r="2" class="green-hole"/>
              <circle cx="18" cy="26" r="2" class="green-hole"/>
              <circle cx="26" cy="26" r="2" class="green-hole"/>
            </svg>
          </div>
          
          <div class="btn-item btn-large" data-id="2">
            <svg class="btn-svg" viewBox="0 0 44 44" width="44" height="44">
              <circle cx="22" cy="22" r="20" class="green-fill green-border" stroke-width="2.5"/>
              <circle cx="22" cy="22" r="14" fill="none" class="green-rim" stroke-width="1.5" stroke-dasharray="2,2"/>
              <circle cx="18" cy="18" r="2" class="green-hole"/>
              <circle cx="26" cy="18" r="2" class="green-hole"/>
              <circle cx="18" cy="26" r="2" class="green-hole"/>
              <circle cx="26" cy="26" r="2" class="green-hole"/>
            </svg>
          </div>
          
          <div class="btn-item btn-small" data-id="3">
            <svg class="btn-svg" viewBox="0 0 28 28" width="28" height="28">
              <circle cx="14" cy="14" r="12" class="green-fill green-border" stroke-width="2"/>
              <circle cx="14" cy="14" r="8" fill="none" class="green-rim" stroke-width="1" stroke-dasharray="1.5,1.5"/>
              <circle cx="11.5" cy="11.5" r="1.3" class="green-hole"/>
              <circle cx="16.5" cy="11.5" r="1.3" class="green-hole"/>
              <circle cx="11.5" cy="16.5" r="1.3" class="green-hole"/>
              <circle cx="16.5" cy="16.5" r="1.3" class="green-hole"/>
            </svg>
          </div>
        </div>
      </div>

      
      <div class="group-box theme-purple">
        <span class="group-title">Purple</span>
        <div class="buttons-container">
          
          <div class="btn-item btn-large" data-id="4">
            <svg class="btn-svg" viewBox="0 0 44 44" width="44" height="44">
              <circle cx="22" cy="22" r="20" class="purple-fill purple-border" stroke-width="2.5"/>
              <circle cx="22" cy="22" r="14" fill="none" class="purple-rim" stroke-width="1.5" stroke-dasharray="2,2"/>
              <circle cx="18" cy="18" r="2" class="purple-hole"/>
              <circle cx="26" cy="18" r="2" class="purple-hole"/>
              <circle cx="18" cy="26" r="2" class="purple-hole"/>
              <circle cx="26" cy="26" r="2" class="purple-hole"/>
            </svg>
          </div>
          
          <div class="btn-item btn-large" data-id="5">
            <svg class="btn-svg" viewBox="0 0 44 44" width="44" height="44">
              <circle cx="22" cy="22" r="20" class="purple-fill purple-border" stroke-width="2.5"/>
              <circle cx="22" cy="22" r="14" fill="none" class="purple-rim" stroke-width="1.5" stroke-dasharray="2,2"/>
              <circle cx="18" cy="18" r="2" class="purple-hole"/>
              <circle cx="26" cy="18" r="2" class="purple-hole"/>
              <circle cx="18" cy="26" r="2" class="purple-hole"/>
              <circle cx="26" cy="26" r="2" class="purple-hole"/>
            </svg>
          </div>
          
          <div class="btn-item btn-small" data-id="6">
            <svg class="btn-svg" viewBox="0 0 28 28" width="28" height="28">
              <circle cx="14" cy="14" r="12" class="purple-fill purple-border" stroke-width="2"/>
              <circle cx="14" cy="14" r="8" fill="none" class="purple-rim" stroke-width="1" stroke-dasharray="1.5,1.5"/>
              <circle cx="11.5" cy="11.5" r="1.3" class="purple-hole"/>
              <circle cx="16.5" cy="11.5" r="1.3" class="purple-hole"/>
              <circle cx="11.5" cy="16.5" r="1.3" class="purple-hole"/>
              <circle cx="16.5" cy="16.5" r="1.3" class="purple-hole"/>
            </svg>
          </div>
        </div>
      </div>
    </div>
  </div>

  
  <div class="sort-section">
    <div class="section-label">
      <span>Sorted by Size</span>
    </div>
    <div class="groups-row">
      
      <div class="group-box theme-big">
        <span class="group-title">Big</span>
        <div class="buttons-container">
          
          <div class="btn-item btn-large" data-id="1">
            <svg class="btn-svg" viewBox="0 0 44 44" width="44" height="44">
              <circle cx="22" cy="22" r="20" class="green-fill green-border" stroke-width="2.5"/>
              <circle cx="22" cy="22" r="14" fill="none" class="green-rim" stroke-width="1.5" stroke-dasharray="2,2"/>
              <circle cx="18" cy="18" r="2" class="green-hole"/>
              <circle cx="26" cy="18" r="2" class="green-hole"/>
              <circle cx="18" cy="26" r="2" class="green-hole"/>
              <circle cx="26" cy="26" r="2" class="green-hole"/>
            </svg>
          </div>
          
          <div class="btn-item btn-large" data-id="2">
            <svg class="btn-svg" viewBox="0 0 44 44" width="44" height="44">
              <circle cx="22" cy="22" r="20" class="green-fill green-border" stroke-width="2.5"/>
              <circle cx="22" cy="22" r="14" fill="none" class="green-rim" stroke-width="1.5" stroke-dasharray="2,2"/>
              <circle cx="18" cy="18" r="2" class="green-hole"/>
              <circle cx="26" cy="18" r="2" class="green-hole"/>
              <circle cx="18" cy="26" r="2" class="green-hole"/>
              <circle cx="26" cy="26" r="2" class="green-hole"/>
            </svg>
          </div>
          
          <div class="btn-item btn-large" data-id="4">
            <svg class="btn-svg" viewBox="0 0 44 44" width="44" height="44">
              <circle cx="22" cy="22" r="20" class="purple-fill purple-border" stroke-width="2.5"/>
              <circle cx="22" cy="22" r="14" fill="none" class="purple-rim" stroke-width="1.5" stroke-dasharray="2,2"/>
              <circle cx="18" cy="18" r="2" class="purple-hole"/>
              <circle cx="26" cy="18" r="2" class="purple-hole"/>
              <circle cx="18" cy="26" r="2" class="purple-hole"/>
              <circle cx="26" cy="26" r="2" class="purple-hole"/>
            </svg>
          </div>
          
          <div class="btn-item btn-large" data-id="5">
            <svg class="btn-svg" viewBox="0 0 44 44" width="44" height="44">
              <circle cx="22" cy="22" r="20" class="purple-fill purple-border" stroke-width="2.5"/>
              <circle cx="22" cy="22" r="14" fill="none" class="purple-rim" stroke-width="1.5" stroke-dasharray="2,2"/>
              <circle cx="18" cy="18" r="2" class="purple-hole"/>
              <circle cx="26" cy="18" r="2" class="purple-hole"/>
              <circle cx="18" cy="26" r="2" class="purple-hole"/>
              <circle cx="26" cy="26" r="2" class="purple-hole"/>
            </svg>
          </div>
        </div>
      </div>

      
      <div class="group-box theme-small">
        <span class="group-title">Small</span>
        <div class="buttons-container">
          
          <div class="btn-item btn-small" data-id="3">
            <svg class="btn-svg" viewBox="0 0 28 28" width="28" height="28">
              <circle cx="14" cy="14" r="12" class="green-fill green-border" stroke-width="2"/>
              <circle cx="14" cy="14" r="8" fill="none" class="green-rim" stroke-width="1" stroke-dasharray="1.5,1.5"/>
              <circle cx="11.5" cy="11.5" r="1.3" class="green-hole"/>
              <circle cx="16.5" cy="11.5" r="1.3" class="green-hole"/>
              <circle cx="11.5" cy="16.5" r="1.3" class="green-hole"/>
              <circle cx="16.5" cy="16.5" r="1.3" class="green-hole"/>
            </svg>
          </div>
          
          <div class="btn-item btn-small" data-id="6">
            <svg class="btn-svg" viewBox="0 0 28 28" width="28" height="28">
              <circle cx="14" cy="14" r="12" class="purple-fill purple-border" stroke-width="2"/>
              <circle cx="14" cy="14" r="8" fill="none" class="purple-rim" stroke-width="1" stroke-dasharray="1.5,1.5"/>
              <circle cx="11.5" cy="11.5" r="1.3" class="purple-hole"/>
              <circle cx="16.5" cy="11.5" r="1.3" class="purple-hole"/>
              <circle cx="11.5" cy="16.5" r="1.3" class="purple-hole"/>
              <circle cx="16.5" cy="16.5" r="1.3" class="purple-hole"/>
            </svg>
          </div>
        </div>
      </div>
    </div>
  </div>

  <script>
    const buttons = document.querySelectorAll('.btn-item');
    let activeId = null;

    buttons.forEach(btn => {
      btn.addEventListener('click', () => {
        const id = btn.getAttribute('data-id');
        if (activeId === id) {
          activeId = null;
          buttons.forEach(b => b.classList.remove('active'));
        } else {
          activeId = id;
          buttons.forEach(b => {
            if (b.getAttribute('data-id') === id) {
              b.classList.add('active');
            } else {
              b.classList.remove('active');
            }
          });
        }
      });
    });
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Sorting Classroom Objects</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #0f172a;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      min-height: 100%;
      padding: 10px 8px;
      user-select: none;
    }

    .header-bar {
      width: 100%;
      max-width: 480px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 10px;
    }

    .step-badge {
      font-size: 13px;
      font-weight: 700;
      color: #0f172a;
      background: #e2e8f0;
      padding: 5px 12px;
      border-radius: 20px;
    }

    .controls {
      display: flex;
      gap: 6px;
    }

    .btn {
      background: #ffffff;
      border: 1px solid #94a3b8;
      border-radius: 8px;
      padding: 5px 12px;
      font-size: 13px;
      font-weight: 700;
      color: #0f172a;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: background 0.15s, border-color 0.15s;
    }

    .btn:active {
      background: #e2e8f0;
    }

    /* Stage without outer card shell */
    .stage {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 330px;
      background: transparent;
      border: none;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 0;
    }

    /* Unsorted Top Collection Area */
    .source-shelf {
      height: 56px;
      background: #ffffff;
      border: 1.5px dashed #94a3b8;
      border-radius: 12px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    }

    .shelf-label {
      position: absolute;
      top: -10px;
      left: 12px;
      background: #ffffff;
      padding: 0 8px;
      font-size: 11px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #334155;
      border-radius: 4px;
    }

    /* Target Bins Row */
    .bins-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
      height: 260px;
      margin-top: 14px;
    }

    .bin {
      border-radius: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 8px 6px;
      position: relative;
      transition: box-shadow 0.3s ease, border-color 0.3s ease;
    }

    .bin-crayons {
      background: #f0f9ff;
      border: 2px solid #bae6fd;
    }

    .bin-pencils {
      background: #fefce8;
      border: 2px solid #fef08a;
    }

    .bin-erasers {
      background: #fdf2f8;
      border: 2px solid #fbcfe8;
    }

    .bin-crayons.bin-active {
      border-color: #0284c7;
      box-shadow: 0 4px 12px rgba(2, 132, 199, 0.18);
    }

    .bin-pencils.bin-active {
      border-color: #d97706;
      box-shadow: 0 4px 12px rgba(217, 119, 6, 0.18);
    }

    .bin-erasers.bin-active {
      border-color: #db2777;
      box-shadow: 0 4px 12px rgba(219, 39, 119, 0.18);
    }

    .bin-header {
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 8px;
      padding: 0 2px;
      min-height: 26px;
    }

    .bin-title {
      font-size: 12px;
      font-weight: 800;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .bin-crayons .bin-title { color: #0369a1; }
    .bin-pencils .bin-title { color: #78350f; }
    .bin-erasers .bin-title { color: #9d174d; }

    .count-badge {
      font-size: 12px;
      font-weight: 800;
      min-width: 22px;
      height: 22px;
      padding: 0 5px;
      border-radius: 11px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #ffffff;
      box-shadow: 0 1px 3px rgba(0,0,0,0.12);
      transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    .bin-crayons .count-badge { color: #0369a1; border: 1.5px solid #0284c7; }
    .bin-pencils .count-badge { color: #78350f; border: 1.5px solid #d97706; }
    .bin-erasers .count-badge { color: #9d174d; border: 1.5px solid #db2777; }

    .count-pop {
      transform: scale(1.3);
    }

    .bin-dropzone {
      flex: 1;
      width: 100%;
      border-radius: 8px;
      background: rgba(255, 255, 255, 0.7);
      border: 1px dashed rgba(0, 0, 0, 0.08);
    }

    /* Moveable Item Tokens */
    .item-token {
      position: absolute;
      width: 38px;
      height: 38px;
      font-size: 22px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 9px;
      background: #ffffff;
      box-shadow: 0 2px 6px rgba(0,0,0,0.12);
      border: 1px solid #cbd5e1;
      transition: top 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                  left 0.6s cubic-bezier(0.4, 0, 0.2, 1);
      z-index: 10;
      pointer-events: none;
    }

    /* Step Navigation Bar */
    .step-nav {
      width: 100%;
      max-width: 480px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 6px;
      margin-top: 12px;
    }

    .step-btn {
      background: #f1f5f9;
      border: 1.5px solid #cbd5e1;
      padding: 7px 3px;
      border-radius: 8px;
      font-size: 11px;
      font-weight: 700;
      color: #1e293b;
      cursor: pointer;
      text-align: center;
      transition: background 0.2s, border-color 0.2s, color 0.2s;
    }

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

    @media (max-width: 380px) {
      .bin-title {
        font-size: 11px;
      }
      .step-btn {
        font-size: 10px;
        padding: 6px 1px;
      }
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <div class="step-badge" id="stepIndicator">Step 1 of 4</div>
    <div class="controls">
      <button class="btn" id="prevBtn" title="Previous Step">◀</button>
      <button class="btn" id="playBtn" title="Play/Pause">⏸ Pause</button>
      <button class="btn" id="nextBtn" title="Next Step">▶</button>
    </div>
  </div>

  <div class="stage" id="stage">
    
    <div class="source-shelf">
      <span class="shelf-label">Unsorted Objects</span>
    </div>

    
    <div class="bins-row">
      
      <div class="bin bin-crayons" id="binCrayons">
        <div class="bin-header">
          <span class="bin-title">🖍️ Crayons</span>
          <span class="count-badge" id="badgeCrayons">0</span>
        </div>
        <div class="bin-dropzone" id="zoneCrayons"></div>
      </div>

      
      <div class="bin bin-pencils" id="binPencils">
        <div class="bin-header">
          <span class="bin-title">✏️ Pencils</span>
          <span class="count-badge" id="badgePencils">0</span>
        </div>
        <div class="bin-dropzone" id="zonePencils"></div>
      </div>

      
      <div class="bin bin-erasers" id="binErasers">
        <div class="bin-header">
          <span class="bin-title">🧼 Erasers</span>
          <span class="count-badge" id="badgeErasers">0</span>
        </div>
        <div class="bin-dropzone" id="zoneErasers"></div>
      </div>
    </div>

    
    <div class="item-token" id="c1" title="Crayon">🖍️</div>
    <div class="item-token" id="p1" title="Pencil">✏️</div>
    <div class="item-token" id="e1" title="Eraser">🧼</div>
    <div class="item-token" id="p2" title="Pencil">✏️</div>
    <div class="item-token" id="c2" title="Crayon">🖍️</div>
    <div class="item-token" id="p3" title="Pencil">✏️</div>
  </div>

  
  <div class="step-nav">
    <button class="step-btn active" id="tab0">1. Mixed</button>
    <button class="step-btn" id="tab1">2. Crayons</button>
    <button class="step-btn" id="tab2">3. Pencils</button>
    <button class="step-btn" id="tab3">4. Erasers</button>
  </div>

  <script>
    const totalSteps = 4;
    let currentStep = 0;
    let isPlaying = true;
    let timer = null;

    // Shelf initial positions (left % centered, top px centered)
    const shelfPos = [
      { l: 9,    t: 28 }, // c1
      { l: 25.4, t: 28 }, // p1
      { l: 41.8, t: 28 }, // e1
      { l: 58.2, t: 28 }, // p2
      { l: 74.6, t: 28 }, // c2
      { l: 91,   t: 28 }  // p3
    ];

    // Sorted destination positions in respective bins (left %, top px)
    // Crayons bin: column 1 (16.67% center)
    // Pencils bin: column 2 (50.0% center)
    // Erasers bin: column 3 (83.33% center)
    const sortedPos = {
      c1: { l: 16.67, t: 150 },
      c2: { l: 16.67, t: 215 },
      p1: { l: 50.0,  t: 135 },
      p2: { l: 50.0,  t: 190 },
      p3: { l: 50.0,  t: 245 },
      e1: { l: 83.33, t: 180 }
    };

    function updateView() {
      // Step buttons & label
      for (let i = 0; i < totalSteps; i++) {
        document.getElementById(`tab${i}`).classList.toggle('active', i === currentStep);
      }
      document.getElementById('stepIndicator').textContent = `Step ${currentStep + 1} of ${totalSteps}`;

      // Counts per step
      const countC = currentStep >= 1 ? 2 : 0;
      const countP = currentStep >= 2 ? 3 : 0;
      const countE = currentStep >= 3 ? 1 : 0;

      const badgeC = document.getElementById('badgeCrayons');
      const badgeP = document.getElementById('badgePencils');
      const badgeE = document.getElementById('badgeErasers');

      triggerBadge(badgeC, countC);
      triggerBadge(badgeP, countP);
      triggerBadge(badgeE, countE);

      // Highlight active bin
      document.getElementById('binCrayons').classList.toggle('bin-active', currentStep === 1);
      document.getElementById('binPencils').classList.toggle('bin-active', currentStep === 2);
      document.getElementById('binErasers').classList.toggle('bin-active', currentStep === 3);

      // Move items
      setItemPosition('c1', currentStep >= 1 ? sortedPos.c1 : shelfPos[0]);
      setItemPosition('p1', currentStep >= 2 ? sortedPos.p1 : shelfPos[1]);
      setItemPosition('e1', currentStep >= 3 ? sortedPos.e1 : shelfPos[2]);
      setItemPosition('p2', currentStep >= 2 ? sortedPos.p2 : shelfPos[3]);
      setItemPosition('c2', currentStep >= 1 ? sortedPos.c2 : shelfPos[4]);
      setItemPosition('p3', currentStep >= 2 ? sortedPos.p3 : shelfPos[5]);
    }

    function setItemPosition(id, pos) {
      const el = document.getElementById(id);
      el.style.left = `calc(${pos.l}% - 19px)`;
      el.style.top = `calc(${pos.t}px - 19px)`;
    }

    function triggerBadge(badgeEl, newCount) {
      if (badgeEl.textContent !== String(newCount)) {
        badgeEl.textContent = newCount;
        badgeEl.classList.add('count-pop');
        setTimeout(() => badgeEl.classList.remove('count-pop'), 300);
      }
    }

    function goToStep(step) {
      currentStep = (step + totalSteps) % totalSteps;
      updateView();
    }

    function nextStep() {
      goToStep(currentStep + 1);
    }

    function prevStep() {
      goToStep(currentStep - 1);
    }

    function startAutoPlay() {
      stopAutoPlay();
      timer = setInterval(() => {
        nextStep();
      }, 3200);
    }

    function stopAutoPlay() {
      if (timer) {
        clearInterval(timer);
        timer = null;
      }
    }

    function togglePlay() {
      isPlaying = !isPlaying;
      document.getElementById('playBtn').textContent = isPlaying ? '⏸ Pause' : '▶ Play';
      if (isPlaying) {
        nextStep();
        startAutoPlay();
      } else {
        stopAutoPlay();
      }
    }

    // Events
    document.getElementById('playBtn').addEventListener('click', togglePlay);
    document.getElementById('nextBtn').addEventListener('click', () => {
      stopAutoPlay();
      isPlaying = false;
      document.getElementById('playBtn').textContent = '▶ Play';
      nextStep();
    });
    document.getElementById('prevBtn').addEventListener('click', () => {
      stopAutoPlay();
      isPlaying = false;
      document.getElementById('playBtn').textContent = '▶ Play';
      prevStep();
    });

    for (let i = 0; i < totalSteps; i++) {
      document.getElementById(`tab${i}`).addEventListener('click', () => {
        stopAutoPlay();
        isPlaying = false;
        document.getElementById('playBtn').textContent = '▶ Play';
        goToStep(i);
      });
    }

    // Initialize
    updateView();
    startAutoPlay();
  </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;
      user-select: none;
      -webkit-user-select: none;
    }

    body {
      width: 100%;
      background: #f8fafc;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 14px 12px;
      gap: 12px;
      overflow-x: hidden;
    }

    /* Top Controls */
    .controls {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      z-index: 10;
      text-align: center;
    }

    .title-text {
      font-size: 15px;
      font-weight: 600;
      color: #475569;
    }

    .btn-toggle {
      background: #2563eb;
      color: #ffffff;
      border: none;
      border-radius: 9999px;
      padding: 9px 22px;
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 3px 10px rgba(37, 99, 235, 0.25);
      transition: background-color 0.2s, box-shadow 0.2s;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .btn-toggle:active {
      background: #1d4ed8;
      box-shadow: 0 2px 5px rgba(37, 99, 235, 0.2);
    }

    /* Play Area */
    .play-area {
      position: relative;
      width: 100%;
      max-width: 520px;
      height: 290px;
      margin: 0 auto;
    }

    /* Messy pile container */
    .pile-container {
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      flex-direction: column;
      align-items: center;
      pointer-events: none;
      transition: opacity 0.4s ease;
      z-index: 1;
    }

    .pile-label {
      font-size: 13px;
      font-weight: 700;
      color: #64748b;
      background: #e2e8f0;
      padding: 3px 12px;
      border-radius: 12px;
      margin-bottom: 6px;
      letter-spacing: 0.3px;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    }

    .pile-zone {
      width: 220px;
      height: 95px;
      border-radius: 50%;
      background: rgba(226, 232, 240, 0.45);
      border: 2px dashed #cbd5e1;
    }

    /* Category Boxes at bottom */
    .boxes-grid {
      position: absolute;
      bottom: 4px;
      left: 0;
      width: 100%;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      height: 125px;
      z-index: 2;
    }

    .category-box {
      border-radius: 16px;
      border: 2.5px solid;
      box-shadow: 0 3px 8px rgba(0, 0, 0, 0.04);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-end;
      padding-bottom: 10px;
      position: relative;
    }

    .box-cars {
      border-color: #93c5fd;
      background: linear-gradient(to bottom, #ffffff 60%, #eff6ff 100%);
    }

    .box-dinos {
      border-color: #86efac;
      background: linear-gradient(to bottom, #ffffff 60%, #f0fdf4 100%);
    }

    .box-blocks {
      border-color: #fde047;
      background: linear-gradient(to bottom, #ffffff 60%, #fefce8 100%);
    }

    .box-label {
      font-size: 14px;
      font-weight: 700;
      color: #334155;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    /* Toy Items */
    .toy {
      position: absolute;
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: #ffffff;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 26px;
      cursor: pointer;
      z-index: 10;
      transition: transform 0.65s cubic-bezier(0.34, 1.25, 0.64, 1),
                  box-shadow 0.3s ease;
    }

    /* Color accents for toy cards */
    .toy-car {
      border: 2px solid #3b82f6;
    }

    .toy-dino {
      border: 2px solid #22c55e;
    }

    .toy-block {
      border: 2px solid #eab308;
    }

    /* Yellow Block SVG Graphic */
    .yellow-block-icon {
      width: 28px;
      height: 28px;
      display: block;
    }

    /* Responsive adjustments */
    @media (max-width: 420px) {
      .toy {
        width: 42px;
        height: 42px;
        font-size: 22px;
      }
      .yellow-block-icon {
        width: 24px;
        height: 24px;
      }
      .box-label {
        font-size: 12px;
      }
      .play-area {
        height: 270px;
      }
      .pile-zone {
        width: 190px;
        height: 85px;
      }
      .boxes-grid {
        gap: 8px;
        height: 115px;
      }
    }
  </style>
</head>
<body>

  <div class="controls">
    <button id="toggleBtn" class="btn-toggle" aria-label="Sort or mix toys">
      <span>Sort! ➔</span>
    </button>
  </div>

  <div class="play-area" id="playArea">
    
    <div class="pile-container" id="pileContainer">
      <span class="pile-label">Messy Toy Pile</span>
      <div class="pile-zone"></div>
    </div>

    
    <div class="boxes-grid">
      <div class="category-box box-cars">
        <span class="box-label">Cars</span>
      </div>
      <div class="category-box box-dinos">
        <span class="box-label">Dinosaurs</span>
      </div>
      <div class="category-box box-blocks">
        <span class="box-label">Blocks</span>
      </div>
    </div>

    
    <div class="toy toy-car" id="toy0" title="Blue Car">🚙</div>
    <div class="toy toy-car" id="toy1" title="Blue Car">🚙</div>
    <div class="toy toy-dino" id="toy2" title="Green T-Rex">🦖</div>
    <div class="toy toy-dino" id="toy3" title="Green Sauropod">🦕</div>
    <div class="toy toy-block" id="toy4" title="Yellow Block">
      <svg class="yellow-block-icon" viewBox="0 0 32 32" fill="none">
        <rect x="3" y="3" width="26" height="26" rx="5" fill="#FACC15" stroke="#CA8A04" stroke-width="2"/>
        <circle cx="10" cy="10" r="3" fill="#FEF08A" stroke="#CA8A04" stroke-width="1.5"/>
        <circle cx="22" cy="10" r="3" fill="#FEF08A" stroke="#CA8A04" stroke-width="1.5"/>
        <circle cx="10" cy="22" r="3" fill="#FEF08A" stroke="#CA8A04" stroke-width="1.5"/>
        <circle cx="22" cy="22" r="3" fill="#FEF08A" stroke="#CA8A04" stroke-width="1.5"/>
      </svg>
    </div>
    <div class="toy toy-block" id="toy5" title="Yellow Block">
      <svg class="yellow-block-icon" viewBox="0 0 32 32" fill="none">
        <rect x="3" y="3" width="26" height="26" rx="5" fill="#FACC15" stroke="#CA8A04" stroke-width="2"/>
        <circle cx="10" cy="10" r="3" fill="#FEF08A" stroke="#CA8A04" stroke-width="1.5"/>
        <circle cx="22" cy="10" r="3" fill="#FEF08A" stroke="#CA8A04" stroke-width="1.5"/>
        <circle cx="10" cy="22" r="3" fill="#FEF08A" stroke="#CA8A04" stroke-width="1.5"/>
        <circle cx="22" cy="22" r="3" fill="#FEF08A" stroke="#CA8A04" stroke-width="1.5"/>
      </svg>
    </div>
  </div>

  <script>
    const toggleBtn = document.getElementById('toggleBtn');
    const playArea = document.getElementById('playArea');
    const pileContainer = document.getElementById('pileContainer');
    const toys = [
      document.getElementById('toy0'),
      document.getElementById('toy1'),
      document.getElementById('toy2'),
      document.getElementById('toy3'),
      document.getElementById('toy4'),
      document.getElementById('toy5')
    ];

    let isSorted = false;

    // Relative messy pile positions (relative to playArea width/height)
    const messyPositions = [
      { x: 0.42, y: 0.12, r: -12 },
      { x: 0.54, y: 0.14, r: 14 },
      { x: 0.36, y: 0.23, r: 8 },
      { x: 0.58, y: 0.24, r: -15 },
      { x: 0.45, y: 0.26, r: 6 },
      { x: 0.50, y: 0.18, r: -6 }
    ];

    // Sorted target positions inside boxes (columns: 0=cars, 1=dinos, 2=blocks)
    function getSortedPositions() {
      return [
        // Cars (Box 1)
        { col: 0, slot: 0 },
        { col: 0, slot: 1 },
        // Dinosaurs (Box 2)
        { col: 1, slot: 0 },
        { col: 1, slot: 1 },
        // Blocks (Box 3)
        { col: 2, slot: 0 },
        { col: 2, slot: 1 }
      ];
    }

    function renderPositions() {
      const areaW = playArea.clientWidth;
      const areaH = playArea.clientHeight;
      const toySize = toys[0].offsetWidth;

      if (!isSorted) {
        pileContainer.style.opacity = '1';
        toggleBtn.innerHTML = '<span>Sort! ➔</span>';
        toggleBtn.style.background = '#2563eb';

        toys.forEach((toy, i) => {
          const pos = messyPositions[i];
          const px = pos.x * areaW - (toySize / 2);
          const py = pos.y * areaH;
          toy.style.transform = `translate(${px}px, ${py}px) rotate(${pos.r}deg)`;
        });
      } else {
        pileContainer.style.opacity = '0.2';
        toggleBtn.innerHTML = '<span>Mix Up ↺</span>';
        toggleBtn.style.background = '#0d9488';

        const sorted = getSortedPositions();
        const colWidth = areaW / 3;
        const boxHeight = areaW < 420 ? 115 : 125;
        const boxTop = areaH - boxHeight;

        toys.forEach((toy, i) => {
          const item = sorted[i];
          const colCenter = (item.col + 0.5) * colWidth;
          const offset = item.slot === 0 ? -(toySize * 0.5 + 4) : (toySize * 0.5 + 4);
          const px = colCenter + offset - (toySize / 2);
          const py = boxTop + 20;

          toy.style.transform = `translate(${px}px, ${py}px) rotate(0deg)`;
        });
      }
    }

    toggleBtn.addEventListener('click', () => {
      isSorted = !isSorted;
      renderPositions();
    });

    toys.forEach(toy => {
      toy.addEventListener('click', () => {
        isSorted = !isSorted;
        renderPositions();
      });
    });

    window.addEventListener('resize', renderPositions);
    // Initial position render
    renderPositions();
  </script>
</body>
</html>

111.3(b)(1)(E)

Aligned learning resources

Related diagrams