<!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;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 10px 8px;
      user-select: none;
      -webkit-user-select: none;
    }

    .header-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 600px;
      padding: 4px 8px 8px;
    }

    .count-display {
      font-size: 20px;
      font-weight: 800;
      color: #2563eb;
      background: #eff6ff;
      padding: 6px 16px;
      border-radius: 20px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background 0.3s ease, color 0.3s ease;
    }

    .count-display.complete {
      background: #fef3c7;
      color: #d97706;
    }

    .controls {
      display: flex;
      gap: 8px;
    }

    button {
      font-family: inherit;
      font-size: 15px;
      font-weight: 700;
      border: none;
      cursor: pointer;
      padding: 8px 16px;
      border-radius: 12px;
      transition: opacity 0.2s ease, background 0.2s ease;
    }

    button:active {
      opacity: 0.8;
    }

    .btn-next {
      background: #2563eb;
      color: #ffffff;
      box-shadow: 0 3px 0 #1d4ed8;
    }

    .btn-next:disabled {
      background: #94a3b8;
      box-shadow: 0 3px 0 #64748b;
      cursor: not-allowed;
      opacity: 0.6;
    }

    .btn-reset {
      background: #f1f5f9;
      color: #475569;
      box-shadow: 0 3px 0 #cbd5e1;
    }

    .jars-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 8px 6px;
      width: 100%;
      max-width: 600px;
      margin: auto 0;
    }

    .jar-card {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #f8fafc;
      border-radius: 16px;
      padding: 6px 4px 8px;
      opacity: 0.22;
      transition: opacity 0.35s ease, background-color 0.35s ease, box-shadow 0.35s ease;
    }

    .jar-card.active {
      opacity: 1;
      background: #ffffff;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.12);
    }

    .jar-card.latest {
      box-shadow: 0 0 0 2px #2563eb, 0 6px 16px rgba(37, 99, 235, 0.2);
      animation: popIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    @keyframes popIn {
      0% { transform: scale(0.85); }
      100% { transform: scale(1); }
    }

    .jar-svg {
      width: 100%;
      max-width: 68px;
      height: auto;
      aspect-ratio: 56 / 72;
    }

    .label-badge {
      font-size: 15px;
      font-weight: 800;
      color: #64748b;
      margin-top: 4px;
      padding: 2px 8px;
      border-radius: 8px;
      transition: color 0.3s ease, background 0.3s ease, transform 0.3s ease;
    }

    .jar-card.active .label-badge {
      color: #1e2945;
      background: #f1f5f9;
    }

    .jar-card.latest .label-badge {
      color: #ffffff;
      background: #2563eb;
      transform: scale(1.12);
    }

    @media (max-width: 420px) {
      .header-bar {
        padding: 2px 4px 6px;
      }
      .count-display {
        font-size: 17px;
        padding: 5px 12px;
      }
      button {
        font-size: 13px;
        padding: 6px 12px;
      }
      .jars-grid {
        gap: 6px 4px;
      }
      .label-badge {
        font-size: 13px;
        padding: 1px 6px;
      }
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <div class="count-display" id="countDisplay">
      <span id="countNum">10</span> Marbles
    </div>
    <div class="controls">
      <button class="btn-reset" onclick="resetCount()">↺ Reset</button>
      <button class="btn-next" id="nextBtn" onclick="nextTen()">Next Ten +10</button>
    </div>
  </div>

  <div class="jars-grid" id="jarsGrid">
    
  </div>

  <script>
    const MARBLE_COLORS = [
      '#2563eb', '#f97316', '#facc15', '#06b6d4', '#8b5cf6',
      '#ec4899', '#10b981', '#f43f5e', '#3b82f6', '#eab308'
    ];

    // Coordinates for 10 marbles inside the jar (viewBox 0 0 56 72)
    const MARBLE_COORDS = [
      { x: 17, y: 58 }, { x: 28, y: 59 }, { x: 39, y: 58 },
      { x: 21, y: 48 }, { x: 34, y: 48 },
      { x: 17, y: 38 }, { x: 28, y: 37 }, { x: 39, y: 38 },
      { x: 22, y: 27 }, { x: 33, y: 27 }
    ];

    let currentStep = 1;
    const TOTAL_STEPS = 10;
    const PENTATONIC_FREQS = [261.63, 293.66, 329.63, 392.00, 440.00, 523.25, 587.33, 659.25, 783.99, 1046.50];

    function createJarSVG(stepIndex) {
      const marblesSVG = MARBLE_COORDS.map((pt, i) => {
        const color = MARBLE_COLORS[(i + stepIndex * 3) % MARBLE_COLORS.length];
        return `
          <g>
            <circle cx="${pt.x}" cy="${pt.y}" r="4.8" fill="${color}"/>
            <circle cx="${pt.x - 1.2}" cy="${pt.y - 1.2}" r="1.5" fill="#ffffff" opacity="0.6"/>
          </g>
        `;
      }).join('');

      return `
        <svg class="jar-svg" viewBox="0 0 56 72">
          
          <rect x="18" y="4" width="20" height="5" rx="2.5" fill="#94a3b8" />
          <rect x="21" y="9" width="14" height="4" fill="#cbd5e1" />
          
          <rect x="8" y="13" width="40" height="54" rx="10" fill="#f0fdf4" fill-opacity="0.35" stroke="#94a3b8" stroke-width="2.5" />
          
          <path d="M 12 24 Q 12 18 18 16" fill="none" stroke="#ffffff" stroke-width="2.5" stroke-linecap="round" opacity="0.8" />
          
          ${marblesSVG}
        </svg>
      `;
    }

    function initGrid() {
      const grid = document.getElementById('jarsGrid');
      grid.innerHTML = '';
      for (let i = 1; i <= TOTAL_STEPS; i++) {
        const card = document.createElement('div');
        card.className = `jar-card ${i === 1 ? 'active latest' : ''}`;
        card.id = `jar-${i}`;
        card.innerHTML = `
          ${createJarSVG(i - 1)}
          <div class="label-badge">${i * 10}</div>
        `;
        grid.appendChild(card);
      }
    }

    function playChime(step) {
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        const freq = PENTATONIC_FREQS[step - 1] || 523.25;
        
        osc.type = 'triangle';
        osc.frequency.setValueAtTime(freq, ctx.currentTime);
        
        gain.gain.setValueAtTime(0.2, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.35);
        
        osc.connect(gain);
        gain.connect(ctx.destination);
        
        osc.start();
        osc.stop(ctx.currentTime + 0.35);
      } catch (e) {
        // AudioContext not allowed or unsupported
      }
    }

    function updateState() {
      for (let i = 1; i <= TOTAL_STEPS; i++) {
        const card = document.getElementById(`jar-${i}`);
        if (!card) continue;
        
        card.classList.remove('active', 'latest');
        if (i < currentStep) {
          card.classList.add('active');
        } else if (i === currentStep) {
          card.classList.add('active', 'latest');
        }
      }

      const countNum = document.getElementById('countNum');
      const countDisplay = document.getElementById('countDisplay');
      const nextBtn = document.getElementById('nextBtn');

      countNum.textContent = currentStep * 10;

      if (currentStep === TOTAL_STEPS) {
        countDisplay.classList.add('complete');
        nextBtn.disabled = true;
      } else {
        countDisplay.classList.remove('complete');
        nextBtn.disabled = false;
      }
    }

    function nextTen() {
      if (currentStep < TOTAL_STEPS) {
        currentStep++;
        playChime(currentStep);
        updateState();
      }
    }

    function resetCount() {
      currentStep = 1;
      playChime(1);
      updateState();
    }

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

Counting by Tens Up to 100

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Counting by Tens: Hundred Chart &amp; Base-Ten Rods</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e293b;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100vh;
      user-select: none;
    }

    .main-view {
      display: flex;
      width: 100%;
      max-width: 620px;
      gap: 14px;
      justify-content: center;
      align-items: stretch;
      flex: 1;
    }

    /* Left: Hundred Chart */
    .chart-panel {
      flex: 1.1;
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid #e2e8f0;
      padding: 8px;
      display: flex;
      flex-direction: column;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    }

    .grid-100 {
      display: grid;
      grid-template-columns: repeat(10, 1fr);
      grid-template-rows: repeat(10, 1fr);
      gap: 2px;
      width: 100%;
      height: 100%;
    }

    .cell {
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: clamp(8px, 1.8vw, 11px);
      font-weight: 600;
      color: #475569;
      border-radius: 3px;
      background: #f8fafc;
      transition: background-color 0.25s ease, color 0.25s ease;
    }

    .cell.ten-col {
      background: #fef08a;
      color: #5c3a00;
      font-weight: 800;
      border: 1px solid #facc15;
    }

    .cell.row-active {
      background: #e2e8f0;
      color: #0f172a;
      font-weight: 700;
    }

    .cell.ten-active {
      background: #eab308 !important;
      color: #451a03 !important;
      border-color: #ca8a04 !important;
      box-shadow: 0 0 6px rgba(234, 179, 8, 0.6);
      font-size: clamp(9px, 2vw, 12px);
      font-weight: 900;
    }

    /* Right: Base Ten Rods View */
    .rods-panel {
      flex: 0.9;
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid #e2e8f0;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    }

    .badge-display {
      display: flex;
      align-items: baseline;
      gap: 6px;
      padding: 4px 12px;
      border-radius: 20px;
      background: #fef9c3;
      border: 1px solid #fef08a;
    }

    .badge-num {
      font-size: clamp(20px, 4.5vw, 28px);
      font-weight: 900;
      color: #713f12;
      line-height: 1;
    }

    .badge-label {
      font-size: clamp(11px, 2.2vw, 13px);
      font-weight: 700;
      color: #854d0e;
    }

    .rods-container {
      display: flex;
      align-items: flex-end;
      justify-content: center;
      gap: clamp(2px, 0.8vw, 5px);
      width: 100%;
      height: 190px;
      padding: 6px 0;
    }

    .rod {
      display: flex;
      flex-direction: column-reverse;
      width: clamp(10px, 2.2vw, 16px);
      height: 100%;
      opacity: 0.15;
      transition: opacity 0.3s ease;
    }

    .rod.active {
      opacity: 1;
    }

    .rod-segment {
      flex: 1;
      background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 100%);
      border: 0.5px solid #d97706;
      border-radius: 1px;
    }

    .rod:last-child .rod-segment {
      background: linear-gradient(135deg, #fde047 0%, #eab308 100%);
    }

    /* Controls Bar */
    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      width: 100%;
      max-width: 620px;
      margin-top: 8px;
    }

    .btn-ctrl {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #1e293b;
      padding: 6px 14px;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      box-shadow: 0 1px 2px rgba(0,0,0,0.05);
      transition: background 0.15s ease, border-color 0.15s ease;
    }

    .btn-ctrl:active {
      background: #f1f5f9;
    }

    .dots-container {
      display: flex;
      gap: 5px;
    }

    .step-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #94a3b8;
      cursor: pointer;
      transition: background-color 0.25s ease;
    }

    .step-dot.active {
      background: #ca8a04;
      box-shadow: 0 0 0 2px rgba(202, 138, 4, 0.3);
    }
  </style>
</head>
<body>

  <div class="main-view">
    
    <div class="chart-panel">
      <div class="grid-100" id="chartGrid"></div>
    </div>

    
    <div class="rods-panel">
      <div class="badge-display">
        <span class="badge-num" id="badgeNum">10</span>
        <span class="badge-label" id="badgeLabel">1 ten</span>
      </div>

      <div class="rods-container" id="rodsContainer"></div>
    </div>
  </div>

  
  <div class="controls">
    <button class="btn-ctrl" id="prevBtn" aria-label="Previous step">‹</button>
    <button class="btn-ctrl" id="playBtn" aria-label="Play or pause">⏸</button>
    <div class="dots-container" id="dotsContainer"></div>
    <button class="btn-ctrl" id="nextBtn" aria-label="Next step">›</button>
  </div>

  <script src="{{VENDOR_CDN}}/classace-diagram.js"></script>
  <script>
    const totalSteps = 10;
    let currentStep = 1;
    let isPlaying = true;
    let autoTimer = null;

    // Render Hundred Chart
    const grid = document.getElementById('chartGrid');
    for (let i = 1; i <= 100; i++) {
      const cell = document.createElement('div');
      cell.className = 'cell';
      cell.textContent = i;
      if (i % 10 === 0) {
        cell.classList.add('ten-col');
        cell.style.cursor = 'pointer';
        cell.onclick = () => {
          setStep(i / 10);
          pause();
        };
      }
      grid.appendChild(cell);
    }

    // Render Base 10 Rods
    const rodsContainer = document.getElementById('rodsContainer');
    for (let r = 0; r < 10; r++) {
      const rod = document.createElement('div');
      rod.className = 'rod';
      rod.id = `rod-${r + 1}`;
      for (let s = 0; s < 10; s++) {
        const seg = document.createElement('div');
        seg.className = 'rod-segment';
        rod.appendChild(seg);
      }
      rod.style.cursor = 'pointer';
      rod.onclick = () => {
        setStep(r + 1);
        pause();
      };
      rodsContainer.appendChild(rod);
    }

    // Render Step Dots
    const dotsContainer = document.getElementById('dotsContainer');
    for (let d = 1; d <= totalSteps; d++) {
      const dot = document.createElement('div');
      dot.className = 'step-dot';
      dot.id = `dot-${d}`;
      dot.onclick = () => {
        setStep(d);
        pause();
      };
      dotsContainer.appendChild(dot);
    }

    function updateState() {
      const val = currentStep * 10;
      document.getElementById('badgeNum').textContent = val;
      document.getElementById('badgeLabel').textContent = currentStep === 1 ? '1 ten' : `${currentStep} tens`;

      // Update Chart cells
      const cells = grid.children;
      for (let i = 1; i <= 100; i++) {
        const cell = cells[i - 1];
        const row = Math.ceil(i / 10);
        const isTen = (i % 10 === 0);

        if (row <= currentStep) {
          if (isTen) {
            cell.classList.add('ten-active');
          } else {
            cell.classList.add('row-active');
          }
        } else {
          cell.classList.remove('row-active');
          cell.classList.remove('ten-active');
        }
      }

      // Update Rods
      for (let r = 1; r <= 10; r++) {
        const rodEl = document.getElementById(`rod-${r}`);
        if (r <= currentStep) {
          rodEl.classList.add('active');
        } else {
          rodEl.classList.remove('active');
        }
      }

      // Update Dots
      for (let d = 1; d <= totalSteps; d++) {
        const dotEl = document.getElementById(`dot-${d}`);
        if (d === currentStep) {
          dotEl.classList.add('active');
        } else {
          dotEl.classList.remove('active');
        }
      }
    }

    function setStep(step) {
      currentStep = step;
      if (currentStep > totalSteps) currentStep = 1;
      if (currentStep < 1) currentStep = totalSteps;
      updateState();
    }

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

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

    function play() {
      isPlaying = true;
      document.getElementById('playBtn').textContent = '⏸';
      clearInterval(autoTimer);
      autoTimer = setInterval(nextStep, 2600);
    }

    function pause() {
      isPlaying = false;
      document.getElementById('playBtn').textContent = '▶';
      clearInterval(autoTimer);
    }

    document.getElementById('prevBtn').onclick = () => { prevStep(); pause(); };
    document.getElementById('nextBtn').onclick = () => { nextStep(); pause(); };
    document.getElementById('playBtn').onclick = () => { isPlaying ? pause() : play(); };

    // Initialize
    updateState();
    play();
  </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;
      color: #1e2945;
      background: #f8fafc;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 16px 12px;
    }

    .header-text {
      font-size: 18px;
      font-weight: 700;
      color: #334155;
      text-align: center;
      margin-bottom: 8px;
    }

    .path-container {
      width: 100%;
      max-width: 520px;
      display: flex;
      flex-direction: column;
      gap: 16px;
      position: relative;
      margin: auto 0;
    }

    .stone-row {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 10px;
      position: relative;
    }

    .stone {
      aspect-ratio: 1;
      border-radius: 50%;
      border: 3px solid transparent;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-size: 26px;
      font-weight: 800;
      cursor: pointer;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.08);
      transition: background-color 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
      position: relative;
      outline: none;
    }

    .stone:focus-visible {
      outline: 3px solid #0284c7;
    }

    /* Pastel base colors */
    .stone-1 { background-color: #fef08a; color: #854d0e; }
    .stone-2 { background-color: #fed7aa; color: #9a3412; }
    .stone-3 { background-color: #fecdd3; color: #9f1239; }
    .stone-4 { background-color: #fbcfe8; color: #9d174d; }
    .stone-5 { background-color: #e9d5ff; color: #6b21a8; }
    .stone-6 { background-color: #ddd6fe; color: #5b21b6; }
    .stone-7 { background-color: #bfdbfe; color: #1e40af; }
    .stone-8 { background-color: #bae6fd; color: #075985; }
    .stone-9 { background-color: #bbf7d0; color: #166534; }
    .stone-10 { background-color: #a7f3d0; color: #065f46; }

    /* Active counting step */
    .stone.active {
      box-shadow: 0 0 0 4px #0284c7, 0 8px 16px rgba(2, 132, 199, 0.25);
      border-color: #ffffff;
      filter: brightness(1.08);
    }

    /* Path guide connector */
    .row-connector {
      display: flex;
      justify-content: flex-end;
      padding-right: 8%;
      color: #94a3b8;
      font-size: 20px;
      line-height: 1;
      margin: -6px 0;
    }

    .status-bar {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      min-height: 38px;
      margin-top: 8px;
      font-size: 16px;
      font-weight: 700;
      color: #0369a1;
      text-align: center;
    }

    .status-badge {
      background: #e0f2fe;
      border: 1px solid #bae6fd;
      border-radius: 20px;
      padding: 6px 16px;
      display: inline-block;
    }

    @media (max-width: 400px) {
      .stone {
        font-size: 20px;
        border-width: 2px;
      }
      .stone-row {
        gap: 6px;
      }
      .header-text {
        font-size: 16px;
      }
    }
  </style>
</head>
<body>

  <div class="header-text">Tap any stone to count to 10:</div>

  <div class="path-container">
    <div class="stone-row" id="row1">
      <button class="stone stone-1" data-val="1" aria-label="Stone 1">1</button>
      <button class="stone stone-2" data-val="2" aria-label="Stone 2">2</button>
      <button class="stone stone-3" data-val="3" aria-label="Stone 3">3</button>
      <button class="stone stone-4" data-val="4" aria-label="Stone 4">4</button>
      <button class="stone stone-5" data-val="5" aria-label="Stone 5">5</button>
    </div>

    <div class="row-connector">⤵</div>

    <div class="stone-row" id="row2">
      <button class="stone stone-6" data-val="6" aria-label="Stone 6">6</button>
      <button class="stone stone-7" data-val="7" aria-label="Stone 7">7</button>
      <button class="stone stone-8" data-val="8" aria-label="Stone 8">8</button>
      <button class="stone stone-9" data-val="9" aria-label="Stone 9">9</button>
      <button class="stone stone-10" data-val="10" aria-label="Stone 10">10</button>
    </div>
  </div>

  <div class="status-bar">
    <div class="status-badge" id="statusText">Pick a start number!</div>
  </div>

  <script>
    const stones = Array.from(document.querySelectorAll('.stone'));
    const statusText = document.getElementById('statusText');
    let timer = null;
    let audioCtx = null;

    // Pitch table for musical stepping sound
    const pitches = [261.63, 293.66, 329.63, 349.23, 392.00, 440.00, 493.88, 523.25, 587.33, 659.25];

    function playTone(freq) {
      try {
        if (!audioCtx) audioCtx = new (window.AudioContext || window.webkitAudioContext)();
        if (audioCtx.state === 'suspended') audioCtx.resume();
        const osc = audioCtx.createOscillator();
        const gain = audioCtx.createGain();
        osc.type = 'sine';
        osc.frequency.setValueAtTime(freq, audioCtx.currentTime);
        gain.gain.setValueAtTime(0.18, audioCtx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 0.35);
        osc.connect(gain);
        gain.connect(audioCtx.destination);
        osc.start();
        osc.stop(audioCtx.currentTime + 0.35);
      } catch (e) {}
    }

    function clearHighlight() {
      stones.forEach(s => s.classList.remove('active'));
    }

    function countFrom(startVal) {
      if (timer) clearInterval(timer);
      clearHighlight();

      let current = startVal;
      let pathList = [];

      function step() {
        clearHighlight();
        const activeStone = stones[current - 1];
        if (activeStone) {
          activeStone.classList.add('active');
          playTone(pitches[current - 1]);
          pathList.push(current);
          statusText.textContent = pathList.join(' → ');
        }

        if (current >= 10) {
          clearInterval(timer);
          timer = null;
        } else {
          current++;
        }
      }

      step();
      if (startVal < 10) {
        timer = setInterval(step, 650);
      }
    }

    stones.forEach(stone => {
      stone.addEventListener('click', () => {
        const val = parseInt(stone.getAttribute('data-val'), 10);
        countFrom(val);
      });
    });
  </script>
</body>
</html>

Counting From 1 to 10 by Ones

<!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;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 16px 12px;
      overflow-x: hidden;
    }

    .header {
      text-align: center;
      min-height: 48px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }

    .main-label {
      font-size: 22px;
      font-weight: 800;
      color: #1e2945;
      letter-spacing: -0.3px;
      transition: transform 0.3s ease, color 0.3s ease;
    }

    .sub-label {
      font-size: 14px;
      font-weight: 600;
      color: #64748b;
      margin-top: 2px;
    }

    /* Hands container */
    .hands-stage {
      width: 100%;
      max-width: 540px;
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
      margin: 8px 0;
    }

    .hands-svg-container {
      width: 100%;
      aspect-ratio: 540 / 230;
      max-height: 230px;
      position: relative;
    }

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

    /* Finger transitions */
    .finger {
      transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
      transform-origin: bottom center;
    }

    .finger-down {
      transform: scaleY(0.18) translateY(90px);
      opacity: 0.35;
    }

    .finger-up {
      transform: scaleY(1) translateY(0);
      opacity: 1;
    }

    /* Sparkles */
    .sparkle {
      opacity: 0;
      transition: opacity 0.3s ease, transform 0.4s ease;
      transform-origin: center;
      transform: scale(0.5);
    }

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

    /* Number Circles Bar */
    .numbers-bar {
      display: grid;
      grid-template-columns: repeat(10, 1fr);
      gap: 6px;
      width: 100%;
      max-width: 520px;
      margin-top: 6px;
      padding: 0 4px;
    }

    .num-circle {
      aspect-ratio: 1;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      font-weight: 800;
      color: #ffffff;
      cursor: pointer;
      user-select: none;
      transition: transform 0.25s ease, box-shadow 0.25s ease, opacity 0.25s ease;
      opacity: 0.35;
      transform: scale(0.9);
      border: 2px solid rgba(255, 255, 255, 0.8);
    }

    .num-circle.active {
      opacity: 1;
      transform: scale(1.08);
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    }

    .num-circle.current {
      transform: scale(1.18);
      box-shadow: 0 0 0 3px #1e2945, 0 6px 12px rgba(0,0,0,0.2);
      z-index: 2;
    }

    /* Rainbow Colors */
    .c1  { background-color: #ff5964; }
    .c2  { background-color: #ff7e47; }
    .c3  { background-color: #f9a03f; }
    .c4  { background-color: #10b981; }
    .c5  { background-color: #06b6d4; }
    .c6  { background-color: #3b82f6; }
    .c7  { background-color: #6366f1; }
    .c8  { background-color: #8b5cf6; }
    .c9  { background-color: #d946ef; }
    .c10 { background-color: #ec4899; }

    /* Controls */
    .controls {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 10px;
    }

    .btn {
      background: #f1f5f9;
      color: #1e2945;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 8px 18px;
      font-size: 14px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 6px;
      user-select: none;
      transition: background-color 0.2s ease, transform 0.1s ease;
    }

    .btn:active {
      transform: scale(0.96);
    }

    .btn-primary {
      background: #3b82f6;
      color: #ffffff;
      border-color: #2563eb;
    }

    .btn-primary:hover {
      background: #2563eb;
    }

    /* Cheer celebration confetti */
    .confetti-container {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      overflow: hidden;
      opacity: 0;
      transition: opacity 0.4s ease;
    }

    .confetti-container.active {
      opacity: 1;
    }

    @keyframes cheerWave {
      0%, 100% { transform: translateY(0) rotate(0deg); }
      50% { transform: translateY(-8px) rotate(2deg); }
    }

    .hands-svg-container.cheering {
      animation: cheerWave 1.2s ease-in-out infinite;
    }

    @media (max-width: 400px) {
      .main-label { font-size: 19px; }
      .num-circle { font-size: 13px; }
      .btn { padding: 6px 14px; font-size: 13px; }
    }
  </style>
</head>
<body>

  <div class="header">
    <div class="main-label" id="mainTitle">5 fingers on Hand 1</div>
    <div class="sub-label" id="subTitle">Counting on with Hand 2</div>
  </div>

  <div class="hands-stage">
    <div class="confetti-container" id="confettiBox"></div>
    <div class="hands-svg-container" id="svgWrap">
      <svg viewBox="0 0 540 230" fill="none" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <filter id="softShadow" x="-10%" y="-10%" width="130%" height="130%">
            <feDropShadow dx="0" dy="4" stdDeviation="4" flood-opacity="0.08"/>
          </filter>
        </defs>

        
        <g id="hand1" filter="url(#softShadow)">
          
          <rect x="75" y="175" width="90" height="55" rx="16" fill="#fed7aa" stroke="#fbd0a1" stroke-width="2" />
          
          <path d="M 45 125 C 45 95 195 95 195 125 C 195 185 45 185 45 125 Z" fill="#ffedd5" />

          
          
          <rect id="f1" class="finger finger-up" x="48" y="55" width="22" height="75" rx="11" fill="#fed7aa" stroke="#fdba74" stroke-width="2"/>
          
          <rect id="f2" class="finger finger-up" x="76" y="32" width="23" height="100" rx="11.5" fill="#fed7aa" stroke="#fdba74" stroke-width="2"/>
          
          <rect id="f3" class="finger finger-up" x="105" y="20" width="24" height="115" rx="12" fill="#fed7aa" stroke="#fdba74" stroke-width="2"/>
          
          <rect id="f4" class="finger finger-up" x="135" y="35" width="23" height="98" rx="11.5" fill="#fed7aa" stroke="#fdba74" stroke-width="2"/>
          
          <rect id="f5" class="finger finger-up" x="168" y="75" width="25" height="68" rx="12.5" transform="rotate(22 178 95)" fill="#fed7aa" stroke="#fdba74" stroke-width="2"/>

          
          <path d="M 75 135 Q 110 148 150 130" stroke="#fdba74" stroke-width="2.5" stroke-linecap="round" fill="none" opacity="0.6"/>
          <path d="M 85 152 Q 115 160 145 145" stroke="#fdba74" stroke-width="2" stroke-linecap="round" fill="none" opacity="0.6"/>

          
          <rect x="78" y="186" width="84" height="24" rx="12" fill="#ffffff" />
          <text x="120" y="202" font-size="12" font-weight="700" fill="#64748b" text-anchor="middle">Hand 1 (5)</text>
        </g>

        
        <g id="hand2" filter="url(#softShadow)">
          
          <rect x="375" y="175" width="90" height="55" rx="16" fill="#fed7aa" stroke="#fbd0a1" stroke-width="2" />
          
          <path d="M 345 125 C 345 95 495 95 495 125 C 495 185 345 185 345 125 Z" fill="#ffedd5" />

          
          
          <g id="fg6" class="finger finger-down" style="transform-origin: 355px 145px;">
            <rect id="f6" x="347" y="75" width="25" height="68" rx="12.5" transform="rotate(-22 362 95)" fill="#fed7aa" stroke="#fdba74" stroke-width="2"/>
          </g>
          
          <g id="fg7" class="finger finger-down" style="transform-origin: 393px 135px;">
            <rect id="f7" x="382" y="35" width="23" height="98" rx="11.5" fill="#fed7aa" stroke="#fdba74" stroke-width="2"/>
          </g>
          
          <g id="fg8" class="finger finger-down" style="transform-origin: 423px 135px;">
            <rect id="f8" x="411" y="20" width="24" height="115" rx="12" fill="#fed7aa" stroke="#fdba74" stroke-width="2"/>
          </g>
          
          <g id="fg9" class="finger finger-down" style="transform-origin: 452px 135px;">
            <rect id="f9" x="441" y="32" width="23" height="100" rx="11.5" fill="#fed7aa" stroke="#fdba74" stroke-width="2"/>
          </g>
          
          <g id="fg10" class="finger finger-down" style="transform-origin: 481px 135px;">
            <rect id="f10" x="470" y="55" width="22" height="75" rx="11" fill="#fed7aa" stroke="#fdba74" stroke-width="2"/>
          </g>

          
          <path d="M 390 130 Q 430 148 465 135" stroke="#fdba74" stroke-width="2.5" stroke-linecap="round" fill="none" opacity="0.6"/>
          <path d="M 395 145 Q 425 160 455 152" stroke="#fdba74" stroke-width="2" stroke-linecap="round" fill="none" opacity="0.6"/>

          
          <rect x="378" y="186" width="84" height="24" rx="12" fill="#ffffff" />
          <text x="420" y="202" font-size="12" font-weight="700" fill="#64748b" text-anchor="middle">Hand 2</text>
        </g>

        
        
        <text id="sp1" class="sparkle active" x="59" y="47" font-size="18" text-anchor="middle">✨</text>
        <text id="sp2" class="sparkle active" x="87" y="24" font-size="18" text-anchor="middle">✨</text>
        <text id="sp3" class="sparkle active" x="117" y="14" font-size="18" text-anchor="middle">✨</text>
        <text id="sp4" class="sparkle active" x="146" y="28" font-size="18" text-anchor="middle">✨</text>
        <text id="sp5" class="sparkle active" x="194" y="70" font-size="18" text-anchor="middle">✨</text>

        
        <text id="sp6" class="sparkle" x="346" y="70" font-size="18" text-anchor="middle">⭐</text>
        <text id="sp7" class="sparkle" x="394" y="28" font-size="18" text-anchor="middle">⭐</text>
        <text id="sp8" class="sparkle" x="423" y="14" font-size="18" text-anchor="middle">⭐</text>
        <text id="sp9" class="sparkle" x="452" y="24" font-size="18" text-anchor="middle">⭐</text>
        <text id="sp10" class="sparkle" x="481" y="47" font-size="18" text-anchor="middle">⭐</text>
      </svg>
    </div>

    
    <div class="numbers-bar">
      <div class="num-circle c1 active" data-count="1">1</div>
      <div class="num-circle c2 active" data-count="2">2</div>
      <div class="num-circle c3 active" data-count="3">3</div>
      <div class="num-circle c4 active" data-count="4">4</div>
      <div class="num-circle c5 active" data-count="5">5</div>
      <div class="num-circle c6" data-count="6">6</div>
      <div class="num-circle c7" data-count="7">7</div>
      <div class="num-circle c8" data-count="8">8</div>
      <div class="num-circle c9" data-count="9">9</div>
      <div class="num-circle c10" data-count="10">10</div>
    </div>
  </div>

  
  <div class="controls">
    <button class="btn" id="prevBtn">← Back</button>
    <button class="btn btn-primary" id="nextBtn">Count Next (+1)</button>
    <button class="btn" id="autoBtn">⏸ Pause</button>
  </div>

  <script>
    // State: current count from 5 up to 10
    let count = 5;
    let autoPlaying = true;
    let timer = null;

    const mainTitle = document.getElementById('mainTitle');
    const subTitle = document.getElementById('subTitle');
    const svgWrap = document.getElementById('svgWrap');
    const confettiBox = document.getElementById('confettiBox');
    const numCircles = document.querySelectorAll('.num-circle');
    const nextBtn = document.getElementById('nextBtn');
    const prevBtn = document.getElementById('prevBtn');
    const autoBtn = document.getElementById('autoBtn');

    // Generate lightweight confetti particles
    function initConfetti() {
      const colors = ['#ff5964', '#ff7e47', '#f9a03f', '#10b981', '#06b6d4', '#3b82f6', '#8b5cf6', '#ec4899'];
      confettiBox.innerHTML = '';
      for (let i = 0; i < 28; i++) {
        const d = document.createElement('div');
        const color = colors[i % colors.length];
        const left = Math.random() * 96 + 2;
        const top = Math.random() * 70 + 10;
        const size = Math.random() * 8 + 6;
        const isCircle = Math.random() > 0.5;
        d.style.cssText = `
          position: absolute;
          left: ${left}%;
          top: ${top}%;
          width: ${size}px;
          height: ${size}px;
          background: ${color};
          border-radius: ${isCircle ? '50%' : '2px'};
          transform: rotate(${Math.random() * 360}deg);
          box-shadow: 0 2px 4px rgba(0,0,0,0.12);
        `;
        confettiBox.appendChild(d);
      }
    }
    initConfetti();

    function updateDiagram(targetCount) {
      count = targetCount;

      // Update Hand 2 fingers (6 to 10)
      for (let i = 6; i <= 10; i++) {
        const fingerGroup = document.getElementById('fg' + i);
        const sparkle = document.getElementById('sp' + i);
        if (i <= count) {
          fingerGroup.classList.remove('finger-down');
          fingerGroup.classList.add('finger-up');
          sparkle.classList.add('active');
        } else {
          fingerGroup.classList.remove('finger-up');
          fingerGroup.classList.add('finger-down');
          sparkle.classList.remove('active');
        }
      }

      // Update Number Circles
      numCircles.forEach((circle) => {
        const cVal = parseInt(circle.dataset.count, 10);
        if (cVal <= count) {
          circle.classList.add('active');
        } else {
          circle.classList.remove('active');
        }

        if (cVal === count) {
          circle.classList.add('current');
        } else {
          circle.classList.remove('current');
        }
      });

      // Titles & Celebration state
      if (count === 10) {
        mainTitle.textContent = '🎉 10 fingers in all!';
        mainTitle.style.color = '#ec4899';
        subTitle.textContent = '5 on Hand 1 + 5 on Hand 2 = 10!';
        svgWrap.classList.add('cheering');
        confettiBox.classList.add('active');
        nextBtn.textContent = '↺ Restart';
      } else if (count === 5) {
        mainTitle.textContent = '5 fingers on Hand 1';
        mainTitle.style.color = '#1e2945';
        subTitle.textContent = 'Add Hand 2 fingers to count up to 10!';
        svgWrap.classList.remove('cheering');
        confettiBox.classList.remove('active');
        nextBtn.textContent = 'Count Next (+1)';
      } else {
        mainTitle.textContent = `${count} fingers raised`;
        mainTitle.style.color = '#1e2945';
        subTitle.textContent = `5 + ${count - 5} more = ${count}`;
        svgWrap.classList.remove('cheering');
        confettiBox.classList.remove('active');
        nextBtn.textContent = 'Count Next (+1)';
      }

      // Back button disabled on 5
      prevBtn.style.opacity = count === 5 ? '0.4' : '1';
      prevBtn.style.pointerEvents = count === 5 ? 'none' : 'auto';
    }

    function stepNext() {
      if (count >= 10) {
        updateDiagram(5);
      } else {
        updateDiagram(count + 1);
      }
    }

    function stepPrev() {
      if (count > 5) {
        updateDiagram(count - 1);
      }
    }

    function startAuto() {
      if (timer) clearInterval(timer);
      timer = setInterval(() => {
        stepNext();
      }, 3200);
      autoPlaying = true;
      autoBtn.textContent = '⏸ Pause';
    }

    function stopAuto() {
      if (timer) clearInterval(timer);
      timer = null;
      autoPlaying = false;
      autoBtn.textContent = '▶ Auto Play';
    }

    // Event Listeners
    nextBtn.addEventListener('click', () => {
      stepNext();
    });

    prevBtn.addEventListener('click', () => {
      stepPrev();
    });

    autoBtn.addEventListener('click', () => {
      if (autoPlaying) {
        stopAuto();
      } else {
        startAuto();
      }
    });

    // Clicking number circles directly
    numCircles.forEach((circle) => {
      circle.addEventListener('click', () => {
        const val = parseInt(circle.dataset.count, 10);
        // We focus on steps 5-10 for the two hands concept
        const target = Math.max(5, val);
        updateDiagram(target);
      });
    });

    // Initialize
    updateDiagram(5);
    startAuto();
  </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;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      width: 100%;
      min-height: 100vh;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f0f8ff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 16px 12px;
      user-select: none;
    }

    .container {
      width: 100%;
      max-width: 480px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
    }

    .header-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      padding: 0 4px;
      margin-bottom: 8px;
    }

    .title {
      font-size: 16px;
      font-weight: 700;
      color: #1e2945;
    }

    .count-display {
      font-size: 18px;
      font-weight: 800;
      color: #0369a1;
      display: flex;
      align-items: center;
      gap: 6px;
      background: #e0f2fe;
      padding: 4px 12px;
      border-radius: 20px;
      border: 1px solid #bae6fd;
    }

    .grid-wrapper {
      position: relative;
      width: 100%;
      padding-top: 24px;
    }

    .stones-grid {
      position: relative;
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 8px;
      width: 100%;
    }

    .stone {
      position: relative;
      background: #ffffff;
      border: 2px solid #cbd5e1;
      border-radius: 14px;
      aspect-ratio: 1 / 1.18;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 6px 2px;
      cursor: pointer;
      transition: border-color 0.4s ease, box-shadow 0.4s ease, transform 0.4s ease, background-color 0.4s ease;
    }

    .stone.active {
      border-color: #0284c7;
      background: #f0f9ff;
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.25);
      transform: translateY(-2px);
      z-index: 2;
    }

    .stone-num {
      font-size: 20px;
      font-weight: 800;
      color: #1e2945;
      line-height: 1;
      margin-bottom: 4px;
      transition: color 0.3s ease;
    }

    .stone.active .stone-num {
      color: #0369a1;
    }

    .dots-container {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      align-content: flex-start;
      gap: 2px;
      width: 100%;
      max-width: 44px;
      padding: 0 2px;
    }

    .dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: #94a3b8;
      transition: background 0.3s ease;
    }

    .stone.active .dot {
      background: #0284c7;
    }

    /* Sound ripples */
    .ripple {
      position: absolute;
      inset: -5px;
      border-radius: 18px;
      border: 2px solid #0284c7;
      opacity: 0;
      pointer-events: none;
    }

    .stone.active .ripple {
      animation: pulse-wave 1.2s ease-out infinite;
    }

    @keyframes pulse-wave {
      0% {
        transform: scale(0.96);
        opacity: 0.7;
      }
      100% {
        transform: scale(1.22);
        opacity: 0;
      }
    }

    /* Frog Token */
    #frog {
      position: absolute;
      width: 36px;
      height: 36px;
      font-size: 26px;
      display: flex;
      align-items: center;
      justify-content: center;
      pointer-events: none;
      z-index: 10;
      transition: top 0.45s cubic-bezier(0.34, 1.3, 0.64, 1),
                  left 0.45s cubic-bezier(0.34, 1.3, 0.64, 1),
                  transform 0.45s ease;
      filter: drop-shadow(0 3px 5px rgba(0, 0, 0, 0.2));
    }

    .controls {
      display: flex;
      gap: 8px;
      width: 100%;
      justify-content: center;
      margin-top: 8px;
    }

    .btn {
      flex: 1;
      padding: 12px 14px;
      font-size: 15px;
      font-weight: 700;
      border-radius: 10px;
      border: 1px solid #cbd5e1;
      background: #ffffff;
      color: #1e2945;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
      transition: background 0.2s, border-color 0.2s, opacity 0.2s;
    }

    .btn:active {
      opacity: 0.85;
    }

    /* WCAG AA compliant high-contrast buttons */
    .btn-primary {
      background: #0284c7;
      border-color: #0369a1;
      color: #ffffff;
    }

    .btn-primary:active {
      background: #0369a1;
    }

    .btn-icon {
      flex: 0 0 46px;
      font-size: 18px;
    }

    @media (max-width: 380px) {
      .stone-num {
        font-size: 17px;
      }
      .dot {
        width: 5px;
        height: 5px;
      }
      .btn {
        font-size: 14px;
        padding: 10px 8px;
      }
    }
  </style>
</head>
<body>

  <div class="container">
    <div class="header-bar">
      <span class="title">Counting Stepping Stones</span>
      <div class="count-display">
        <span>Number:</span>
        <span id="currentCountText">1</span>
      </div>
    </div>

    <div class="grid-wrapper" id="gridWrapper">
      <div id="frog">🐸</div>
      <div class="stones-grid" id="grid">
        
      </div>
    </div>

    <div class="controls">
      <button class="btn btn-primary" id="hopBtn">Hop! 🐸</button>
      <button class="btn" id="playBtn">Play All ▶</button>
      <button class="btn btn-icon" id="resetBtn" title="Reset" aria-label="Reset">↺</button>
    </div>
  </div>

  <script>
    const gridWrapper = document.getElementById('gridWrapper');
    const grid = document.getElementById('grid');
    const frog = document.getElementById('frog');
    const hopBtn = document.getElementById('hopBtn');
    const playBtn = document.getElementById('playBtn');
    const resetBtn = document.getElementById('resetBtn');
    const currentCountText = document.getElementById('currentCountText');

    let currentStep = 1;
    let autoPlayTimer = null;
    const totalStones = 10;
    const stones = [];

    // Frequencies for stones 1 to 10
    const tones = [261.63, 293.66, 329.63, 349.23, 392.00, 440.00, 493.88, 523.25, 587.33, 659.25];

    function playTone(freq) {
      try {
        const AudioCtx = window.AudioContext || window.webkitAudioContext;
        if (!AudioCtx) return;
        const ctx = new AudioCtx();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.type = 'sine';
        osc.frequency.setValueAtTime(freq, ctx.currentTime);
        gain.gain.setValueAtTime(0.18, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.35);
        osc.connect(gain);
        gain.connect(ctx.destination);
        osc.start();
        osc.stop(ctx.currentTime + 0.35);
      } catch (e) {}
    }

    // Build the stepping stones
    for (let i = 1; i <= totalStones; i++) {
      const stone = document.createElement('div');
      stone.className = 'stone' + (i === 1 ? ' active' : '');
      stone.dataset.num = i;

      const ripple = document.createElement('div');
      ripple.className = 'ripple';
      stone.appendChild(ripple);

      const numEl = document.createElement('div');
      numEl.className = 'stone-num';
      numEl.textContent = i;
      stone.appendChild(numEl);

      const dotsContainer = document.createElement('div');
      dotsContainer.className = 'dots-container';
      for (let d = 0; d < i; d++) {
        const dot = document.createElement('div');
        dot.className = 'dot';
        dotsContainer.appendChild(dot);
      }
      stone.appendChild(dotsContainer);

      stone.addEventListener('click', () => {
        stopAutoPlay();
        goToStep(i, true);
      });

      grid.appendChild(stone);
      stones.push(stone);
    }

    function updateFrogPosition() {
      const targetStone = stones[currentStep - 1];
      if (!targetStone) return;

      const wrapperRect = gridWrapper.getBoundingClientRect();
      const stoneRect = targetStone.getBoundingClientRect();

      const left = stoneRect.left - wrapperRect.left + (stoneRect.width / 2) - 18;
      const top = stoneRect.top - wrapperRect.top - 16;

      frog.style.left = `${left}px`;
      frog.style.top = `${top}px`;
      frog.style.transform = 'translateY(-6px) scale(1.1)';
      setTimeout(() => {
        frog.style.transform = 'translateY(0) scale(1)';
      }, 250);
    }

    function goToStep(step, playSound = false) {
      currentStep = step;
      currentCountText.textContent = currentStep;

      stones.forEach((s, idx) => {
        s.classList.toggle('active', idx + 1 === currentStep);
      });

      updateFrogPosition();

      if (playSound) {
        playTone(tones[currentStep - 1]);
      }
    }

    function nextStep(playSound = true) {
      let next = currentStep + 1;
      if (next > totalStones) {
        next = 1;
      }
      goToStep(next, playSound);
    }

    function stopAutoPlay() {
      if (autoPlayTimer) {
        clearInterval(autoPlayTimer);
        autoPlayTimer = null;
        playBtn.textContent = 'Play All ▶';
        playBtn.classList.remove('btn-primary');
      }
    }

    function toggleAutoPlay() {
      if (autoPlayTimer) {
        stopAutoPlay();
      } else {
        playBtn.textContent = 'Pause ⏸';
        playBtn.classList.add('btn-primary');
        if (currentStep === totalStones) {
          goToStep(1, true);
        } else {
          nextStep(true);
        }
        autoPlayTimer = setInterval(() => {
          if (currentStep >= totalStones) {
            goToStep(1, true);
          } else {
            nextStep(true);
          }
        }, 1200);
      }
    }

    hopBtn.addEventListener('click', () => {
      stopAutoPlay();
      nextStep(true);
    });

    playBtn.addEventListener('click', () => {
      toggleAutoPlay();
    });

    resetBtn.addEventListener('click', () => {
      stopAutoPlay();
      goToStep(1, true);
    });

    window.addEventListener('resize', updateFrogPosition);
    setTimeout(updateFrogPosition, 60);
  </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>Counting on Fingers 1 to 5</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
      user-select: none;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background-color: #fdfbf7;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      padding: 12px 14px;
      overflow-x: hidden;
    }

    .main-container {
      width: 100%;
      max-width: 380px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }

    /* Top Display */
    .display-box {
      text-align: center;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      min-height: 48px;
    }

    .number-title {
      font-size: 32px;
      font-weight: 800;
      color: #ff6b6b;
      letter-spacing: -0.5px;
      line-height: 1.2;
      transition: color 0.25s ease;
    }

    .subtitle {
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      margin-top: 2px;
    }

    /* Main Hand Visual Stage */
    .stage {
      position: relative;
      width: 100%;
      max-width: 310px;
      height: 220px;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hand-svg {
      width: 100%;
      height: 100%;
      overflow: visible;
      filter: drop-shadow(0 6px 12px rgba(30, 41, 69, 0.08));
    }

    /* Finger Animations */
    .finger-group {
      transition: transform 0.35s cubic-bezier(0.34, 1.45, 0.64, 1);
    }

    .finger-body {
      transition: fill 0.3s ease, stroke 0.3s ease;
    }

    .finger-badge {
      transition: opacity 0.25s ease, transform 0.3s ease;
    }

    .finger-group.folded {
      transform: scaleY(0.24) !important;
    }

    .finger-group.folded .finger-body {
      fill: #fcd5b8 !important;
      stroke: #e6a782 !important;
    }

    .finger-group.folded .finger-badge {
      opacity: 0;
      pointer-events: none;
    }

    /* Badges Row */
    .badges-row {
      display: flex;
      justify-content: center;
      gap: 8px;
      width: 100%;
    }

    .badge-btn {
      flex: 1;
      max-width: 60px;
      height: 48px;
      border: 2px solid #e2e8f0;
      border-radius: 14px;
      background: #ffffff;
      color: #94a3b8;
      font-size: 20px;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.04);
      transition: background-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    }

    .badge-btn:active {
      filter: brightness(0.92);
    }

    /* Active Badge Themes */
    .badge-btn.active[data-num="1"] { background: #ff6b6b; border-color: #ff6b6b; color: #ffffff; box-shadow: 0 4px 12px rgba(255, 107, 107, 0.35); }
    .badge-btn.active[data-num="2"] { background: #0284c7; border-color: #0284c7; color: #ffffff; box-shadow: 0 4px 12px rgba(2, 132, 199, 0.35); }
    .badge-btn.active[data-num="3"] { background: #10b981; border-color: #10b981; color: #ffffff; box-shadow: 0 4px 12px rgba(16, 185, 129, 0.35); }
    .badge-btn.active[data-num="4"] { background: #f59e0b; border-color: #f59e0b; color: #ffffff; box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35); }
    .badge-btn.active[data-num="5"] { background: #8b5cf6; border-color: #8b5cf6; color: #ffffff; box-shadow: 0 4px 12px rgba(139, 92, 246, 0.35); }

    /* Controls */
    .controls {
      display: flex;
      gap: 10px;
      width: 100%;
    }

    .btn-main {
      flex: 1;
      height: 46px;
      border: none;
      border-radius: 13px;
      background: #1e2945;
      color: #ffffff;
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      box-shadow: 0 3px 8px rgba(30, 41, 69, 0.16);
      transition: opacity 0.2s, background-color 0.2s;
    }

    .btn-main:active {
      opacity: 0.88;
    }

    .btn-sub {
      width: 46px;
      height: 46px;
      border: 2px solid #e2e8f0;
      border-radius: 13px;
      background: #ffffff;
      color: #1e2945;
      font-size: 17px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
      transition: background-color 0.2s, border-color 0.2s;
    }

    .btn-sub:active {
      background: #f1f5f9;
    }

    @media (max-width: 350px) {
      .number-title { font-size: 28px; }
      .badge-btn { height: 42px; font-size: 18px; }
      .btn-main { height: 42px; font-size: 14px; }
      .btn-sub { width: 42px; height: 42px; font-size: 15px; }
      .stage { height: 195px; }
    }
  </style>
</head>
<body>

  <div class="main-container">
    
    <div class="display-box">
      <div id="numberDisplay" class="number-title">1 &bull; One</div>
      <div id="counterSubtitle" class="subtitle">1 finger up</div>
    </div>

    
    <div class="stage">
      <svg class="hand-svg" viewBox="0 0 280 215" aria-label="Cartoon left hand counting fingers 1 to 5">
        <defs>
          <filter id="softGlow" x="-10%" y="-10%" width="120%" height="120%">
            <feDropShadow dx="0" dy="2" stdDeviation="2" flood-color="#000000" flood-opacity="0.06" />
          </filter>
        </defs>

        
        <g id="wristGroup">
          <path d="M 88 178 L 84 212 L 180 212 L 176 178 Z" fill="#6366f1" />
          <rect x="80" y="174" width="104" height="12" rx="6" fill="#818cf8" stroke="#4f46e5" stroke-width="1.5" />
        </g>

        
        
        
        <g id="fingerGroup1" class="finger-group" style="transform-origin: 75px 145px; transform: rotate(-24deg);">
          <rect id="f1" class="finger-body" x="62" y="65" width="26" height="85" rx="13" fill="#ff6b6b" stroke="#e11d48" stroke-width="2" />
          
          <path d="M 68 73 Q 75 69 82 73" stroke="rgba(255,255,255,0.7)" stroke-width="2" fill="none" stroke-linecap="round" />
          
          <g id="badge1" class="finger-badge">
            <circle cx="75" cy="94" r="9.5" fill="#ffffff" filter="url(#softGlow)" />
            <text x="75" y="98" font-size="12" font-weight="800" fill="#ff6b6b" text-anchor="middle">1</text>
          </g>
        </g>

        
        <g id="fingerGroup2" class="finger-group folded" style="transform-origin: 98px 120px; transform: rotate(-6deg);">
          <rect id="f2" class="finger-body" x="86" y="24" width="24" height="100" rx="12" fill="#0284c7" stroke="#0369a1" stroke-width="2" />
          
          <path d="M 91 32 Q 98 28 105 32" stroke="rgba(255,255,255,0.7)" stroke-width="2" fill="none" stroke-linecap="round" />
          
          <g id="badge2" class="finger-badge">
            <circle cx="98" cy="50" r="9.5" fill="#ffffff" filter="url(#softGlow)" />
            <text x="98" y="54" font-size="12" font-weight="800" fill="#0284c7" text-anchor="middle">2</text>
          </g>
        </g>

        
        <g id="fingerGroup3" class="finger-group folded" style="transform-origin: 130px 115px; transform: rotate(0deg);">
          <rect id="f3" class="finger-body" x="118" y="12" width="24" height="110" rx="12" fill="#10b981" stroke="#059669" stroke-width="2" />
          
          <path d="M 123 20 Q 130 16 137 20" stroke="rgba(255,255,255,0.7)" stroke-width="2" fill="none" stroke-linecap="round" />
          
          <g id="badge3" class="finger-badge">
            <circle cx="130" cy="38" r="9.5" fill="#ffffff" filter="url(#softGlow)" />
            <text x="130" y="42" font-size="12" font-weight="800" fill="#10b981" text-anchor="middle">3</text>
          </g>
        </g>

        
        <g id="fingerGroup4" class="finger-group folded" style="transform-origin: 162px 120px; transform: rotate(6deg);">
          <rect id="f4" class="finger-body" x="150" y="24" width="24" height="98" rx="12" fill="#f59e0b" stroke="#d97706" stroke-width="2" />
          
          <path d="M 155 32 Q 162 28 169 32" stroke="rgba(255,255,255,0.7)" stroke-width="2" fill="none" stroke-linecap="round" />
          
          <g id="badge4" class="finger-badge">
            <circle cx="162" cy="50" r="9.5" fill="#ffffff" filter="url(#softGlow)" />
            <text x="162" y="54" font-size="12" font-weight="800" fill="#f59e0b" text-anchor="middle">4</text>
          </g>
        </g>

        
        <g id="fingerGroup5" class="finger-group folded" style="transform-origin: 194px 130px; transform: rotate(14deg);">
          <rect id="f5" class="finger-body" x="182" y="44" width="23" height="86" rx="11.5" fill="#8b5cf6" stroke="#7c3aed" stroke-width="2" />
          
          <path d="M 187 52 Q 193 48 200 52" stroke="rgba(255,255,255,0.7)" stroke-width="2" fill="none" stroke-linecap="round" />
          
          <g id="badge5" class="finger-badge">
            <circle cx="193.5" cy="70" r="9.5" fill="#ffffff" filter="url(#softGlow)" />
            <text x="193.5" y="74" font-size="12" font-weight="800" fill="#8b5cf6" text-anchor="middle">5</text>
          </g>
        </g>

        
        <g id="palmGroup">
          
          <path d="M 88 178 C 65 165, 52 142, 58 126 C 65 110, 80 108, 92 114 C 98 108, 124 104, 130 110 C 136 104, 158 108, 164 114 C 172 108, 192 114, 198 126 C 206 142, 202 165, 176 178 Z" 
                fill="#ffe0c7" stroke="#e29566" stroke-width="2.5" stroke-linejoin="round" />

          
          
          <path d="M 88 126 C 88 144, 102 163, 125 170" fill="none" stroke="#e29566" stroke-width="2" stroke-linecap="round" opacity="0.85" />
          
          <path d="M 184 136 C 158 133, 134 140, 120 148" fill="none" stroke="#e29566" stroke-width="2" stroke-linecap="round" opacity="0.85" />
          
          <path d="M 94 116 Q 98 120 102 116" fill="none" stroke="#e29566" stroke-width="1.5" stroke-linecap="round" opacity="0.7" />
          <path d="M 126 112 Q 130 116 134 112" fill="none" stroke="#e29566" stroke-width="1.5" stroke-linecap="round" opacity="0.7" />
          <path d="M 158 116 Q 162 120 166 116" fill="none" stroke="#e29566" stroke-width="1.5" stroke-linecap="round" opacity="0.7" />
          <path d="M 190 126 Q 194 130 198 126" fill="none" stroke="#e29566" stroke-width="1.5" stroke-linecap="round" opacity="0.7" />
        </g>
      </svg>
    </div>

    
    <div class="badges-row">
      <button class="badge-btn active" data-num="1" aria-label="Count 1">1</button>
      <button class="badge-btn" data-num="2" aria-label="Count 2">2</button>
      <button class="badge-btn" data-num="3" aria-label="Count 3">3</button>
      <button class="badge-btn" data-num="4" aria-label="Count 4">4</button>
      <button class="badge-btn" data-num="5" aria-label="Count 5">5</button>
    </div>

    
    <div class="controls">
      <button id="tapBtn" class="btn-main">Tap to Count +1</button>
      <button id="playBtn" class="btn-sub" title="Auto Play / Pause">▶</button>
    </div>
  </div>

  <script>
    const numberWords = [
      { num: 1, word: "One", color: "#ff6b6b", sub: "1 finger up" },
      { num: 2, word: "Two", color: "#0284c7", sub: "2 fingers up" },
      { num: 3, word: "Three", color: "#10b981", sub: "3 fingers up" },
      { num: 4, word: "Four", color: "#f59e0b", sub: "4 fingers up" },
      { num: 5, word: "Five", color: "#8b5cf6", sub: "5 fingers up (All!)" }
    ];

    const audioFrequencies = [261.63, 293.66, 329.63, 392.00, 523.25]; // C4, D4, E4, G4, C5

    let currentStep = 1;
    let autoPlayTimer = null;
    let audioCtx = null;

    const numberDisplay = document.getElementById("numberDisplay");
    const counterSubtitle = document.getElementById("counterSubtitle");
    const badgeBtns = document.querySelectorAll(".badge-btn");
    const tapBtn = document.getElementById("tapBtn");
    const playBtn = document.getElementById("playBtn");

    function playChime(index) {
      try {
        if (!audioCtx) {
          audioCtx = new (window.AudioContext || window.webkitAudioContext)();
        }
        if (audioCtx.state === "suspended") {
          audioCtx.resume();
        }
        const osc = audioCtx.createOscillator();
        const gain = audioCtx.createGain();
        osc.type = "sine";
        osc.frequency.setValueAtTime(audioFrequencies[index], audioCtx.currentTime);
        gain.gain.setValueAtTime(0.18, audioCtx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, audioCtx.currentTime + 0.35);
        osc.connect(gain);
        gain.connect(audioCtx.destination);
        osc.start();
        osc.stop(audioCtx.currentTime + 0.35);
      } catch (e) {
        // Safe fallback for strict audio policies
      }
    }

    function setStep(step, playSound = false) {
      currentStep = step;
      const data = numberWords[step - 1];

      // Update Text Display
      numberDisplay.innerHTML = `${data.num} &bull; ${data.word}`;
      numberDisplay.style.color = data.color;
      counterSubtitle.textContent = data.sub;

      // Update Fingers
      for (let i = 1; i <= 5; i++) {
        const fingerGroup = document.getElementById(`fingerGroup${i}`);
        if (i <= step) {
          fingerGroup.classList.remove("folded");
        } else {
          fingerGroup.classList.add("folded");
        }
      }

      // Update Badges
      badgeBtns.forEach((btn, index) => {
        const num = index + 1;
        if (num <= step) {
          btn.classList.add("active");
        } else {
          btn.classList.remove("active");
        }
      });

      if (playSound) {
        playChime(step - 1);
      }
    }

    function nextStep(playSound = true) {
      let next = currentStep + 1;
      if (next > 5) next = 1;
      setStep(next, playSound);
    }

    function stopAutoPlay() {
      if (autoPlayTimer) {
        clearInterval(autoPlayTimer);
        autoPlayTimer = null;
        playBtn.textContent = "▶";
      }
    }

    function toggleAutoPlay() {
      if (autoPlayTimer) {
        stopAutoPlay();
      } else {
        playBtn.textContent = "⏸";
        nextStep(true);
        autoPlayTimer = setInterval(() => {
          nextStep(true);
        }, 1600);
      }
    }

    // Event Listeners
    tapBtn.addEventListener("click", () => {
      stopAutoPlay();
      nextStep(true);
    });

    playBtn.addEventListener("click", toggleAutoPlay);

    badgeBtns.forEach((btn, index) => {
      btn.addEventListener("click", () => {
        stopAutoPlay();
        setStep(index + 1, true);
      });
    });

    // Initialize to 1
    setStep(1, false);
  </script>
</body>
</html>

K.CC.A.1

Aligned learning resources