<!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">
  <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;
      padding: 12px;
      min-height: 100%;
      width: 100%;
      user-select: none;
    }

    /* Top Controls */
    .controls {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 340px;
      margin-bottom: 8px;
    }

    .step-tabs {
      display: flex;
      gap: 4px;
    }

    .tab-btn {
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      border-radius: 6px;
      padding: 4px 10px;
      font-size: 12px;
      font-weight: 700;
      color: #64748b;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .tab-btn.active {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
    }

    .play-btn {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 4px 8px;
      font-size: 12px;
      font-weight: 600;
      color: #334155;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .play-btn:active {
      background: #e2e8f0;
    }

    /* Main Walkthrough Container */
    .cards-container {
      width: 100%;
      max-width: 340px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .step-card {
      background: #f8fafc;
      border: 1.5px solid #e2e8f0;
      border-radius: 10px;
      padding: 8px 12px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.3s ease;
      opacity: 0.45;
      cursor: pointer;
    }

    .step-card.active {
      opacity: 1;
      background: #ffffff;
      border-color: #3b82f6;
      box-shadow: 0 4px 12px rgba(59, 130, 246, 0.12);
    }

    .step-card.completed {
      opacity: 0.85;
      background: #ffffff;
      border-color: #cbd5e1;
    }

    .card-left {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .step-label {
      font-size: 11px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .math-expr {
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-size: 15px;
      font-weight: 700;
      color: #1e2945;
      letter-spacing: 0.5px;
    }

    /* Step Highlights */
    .hl-purple {
      background: #ede9fe;
      color: #6d28d9;
      padding: 1px 5px;
      border-radius: 4px;
      border: 1px solid #c4b5fd;
    }

    .hl-orange {
      background: #ffedd5;
      color: #c2410c;
      padding: 1px 5px;
      border-radius: 4px;
      border: 1px solid #fed7aa;
    }

    .hl-blue {
      background: #e0f2fe;
      color: #0369a1;
      padding: 1px 5px;
      border-radius: 4px;
      border: 1px solid #bae6fd;
    }

    .hl-green {
      background: #dcfce7;
      color: #15803d;
      padding: 2px 8px;
      border-radius: 6px;
      border: 1.5px solid #86efac;
      font-size: 16px;
    }

    .action-badge {
      font-size: 11px;
      font-weight: 700;
      padding: 3px 7px;
      border-radius: 6px;
      white-space: nowrap;
      text-align: right;
    }

    .badge-purple {
      background: #f5f3ff;
      color: #7c3aed;
      border: 1px solid #ddd6fe;
    }

    .badge-orange {
      background: #fff7ed;
      color: #ea580c;
      border: 1px solid #ffedd5;
    }

    .badge-blue {
      background: #f0f9ff;
      color: #0284c7;
      border: 1px solid #e0f2fe;
    }

    .badge-green {
      background: #22c55e;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(34, 197, 94, 0.3);
    }

    /* Bottom Dots Navigation */
    .nav-dots {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-top: 6px;
      width: 100%;
    }

    .dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      border: none;
      padding: 0;
      transition: all 0.2s ease;
    }

    .dot.active {
      background: #2563eb;
      transform: scale(1.25);
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <div class="step-tabs">
      <button class="tab-btn active" id="tab0" onclick="goToStep(0)">1</button>
      <button class="tab-btn" id="tab1" onclick="goToStep(1)">2</button>
      <button class="tab-btn" id="tab2" onclick="goToStep(2)">3</button>
      <button class="tab-btn" id="tab3" onclick="goToStep(3)">4</button>
    </div>
    <button class="play-btn" id="playBtn" onclick="togglePlay()">
      <span id="playIcon">⏸</span> Auto
    </button>
  </div>

  
  <div class="cards-container">
    
    
    <div class="step-card active" id="card0" onclick="goToStep(0)">
      <div class="card-left">
        <span class="step-label" style="color: #6d28d9;">1. Innermost ( )</span>
        <div class="math-expr">
          4 × [18 − <span class="hl-purple">(3 + 2)</span> × 2]
        </div>
      </div>
      <div class="action-badge badge-purple">(3+2) → 5</div>
    </div>

    
    <div class="step-card" id="card1" onclick="goToStep(1)">
      <div class="card-left">
        <span class="step-label" style="color: #ea580c;">2. Multiply Inside [ ]</span>
        <div class="math-expr">
          4 × [18 − <span class="hl-orange">5 × 2</span>]
        </div>
      </div>
      <div class="action-badge badge-orange">5×2 → 10</div>
    </div>

    
    <div class="step-card" id="card2" onclick="goToStep(2)">
      <div class="card-left">
        <span class="step-label" style="color: #0284c7;">3. Subtract Inside [ ]</span>
        <div class="math-expr">
          4 × <span class="hl-blue">[18 − 10]</span>
        </div>
      </div>
      <div class="action-badge badge-blue">18−10 → 8</div>
    </div>

    
    <div class="step-card" id="card3" onclick="goToStep(3)">
      <div class="card-left">
        <span class="step-label" style="color: #16a34a;">4. Final Result</span>
        <div class="math-expr">
          <span class="hl-green">4 × 8 = 32</span>
        </div>
      </div>
      <div class="action-badge badge-green">✓ 32</div>
    </div>

  </div>

  
  <div class="nav-dots">
    <button class="dot active" id="dot0" onclick="goToStep(0)" aria-label="Step 1"></button>
    <button class="dot" id="dot1" onclick="goToStep(1)" aria-label="Step 2"></button>
    <button class="dot" id="dot2" onclick="goToStep(2)" aria-label="Step 3"></button>
    <button class="dot" id="dot3" onclick="goToStep(3)" aria-label="Step 4"></button>
  </div>

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

    function updateUI() {
      for (let i = 0; i < totalSteps; i++) {
        const card = document.getElementById('card' + i);
        const tab = document.getElementById('tab' + i);
        const dot = document.getElementById('dot' + i);

        card.classList.remove('active', 'completed');
        tab.classList.remove('active');
        dot.classList.remove('active');

        if (i === currentStep) {
          card.classList.add('active');
          tab.classList.add('active');
          dot.classList.add('active');
        } else if (i < currentStep) {
          card.classList.add('completed');
        }
      }
    }

    function goToStep(stepIndex) {
      currentStep = stepIndex;
      updateUI();
      if (isPlaying) {
        resetTimer();
      }
    }

    function nextStep() {
      currentStep = (currentStep + 1) % totalSteps;
      updateUI();
    }

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

    function togglePlay() {
      isPlaying = !isPlaying;
      const icon = document.getElementById('playIcon');
      if (isPlaying) {
        icon.textContent = '⏸';
        nextStep();
        resetTimer();
      } else {
        icon.textContent = '▶';
        if (timer) clearInterval(timer);
      }
    }

    // Initialize stepper
    updateUI();
    resetTimer();
  </script>
</body>
</html>

Evaluating Expressions with Parentheses and Brackets

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      width: 100%;
      min-height: 100%;
      background: #f8f9fa;
      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: 12px;
      gap: 12px;
    }

    .stepper {
      display: flex;
      gap: 8px;
      background: #e2e8f0;
      padding: 4px;
      border-radius: 20px;
    }

    .step-btn {
      border: none;
      background: transparent;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 700;
      border-radius: 16px;
      cursor: pointer;
      color: #64748b;
      transition: all 0.25s ease;
    }

    .step-btn.active-1 {
      background: #f59e0b;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(245, 158, 11, 0.35);
    }

    .step-btn.active-2 {
      background: #2563eb;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(37, 99, 235, 0.35);
    }

    .diagram-area {
      width: 100%;
      max-width: 440px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
    }

    /* Outer Bracket Box */
    .outer-box {
      width: 100%;
      border: 3px solid #bfdbfe;
      background: #eff6ff;
      border-radius: 14px;
      padding: 14px 12px;
      position: relative;
      transition: border-color 0.3s ease, box-shadow 0.3s ease;
    }

    .outer-box.highlight {
      border-color: #2563eb;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
    }

    .box-tag {
      position: absolute;
      top: -11px;
      left: 14px;
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.5px;
      padding: 2px 8px;
      border-radius: 6px;
      text-transform: uppercase;
    }

    .outer-tag {
      background: #2563eb;
      color: #ffffff;
    }

    .outer-content {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-size: 20px;
      font-weight: 700;
      flex-wrap: wrap;
    }

    .symbol-outer {
      color: #2563eb;
      font-size: 26px;
      font-weight: 800;
      user-select: none;
    }

    /* Inner Parentheses Box */
    .inner-box {
      border: 3px solid #fde68a;
      background: #fffbeb;
      border-radius: 10px;
      padding: 10px 14px;
      position: relative;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: border-color 0.3s ease, box-shadow 0.3s ease;
    }

    .inner-box.highlight {
      border-color: #f59e0b;
      box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.25);
    }

    .inner-tag {
      background: #f59e0b;
      color: #ffffff;
    }

    .symbol-inner {
      color: #d97706;
      font-size: 22px;
      font-weight: 800;
      user-select: none;
    }

    .math-inner {
      color: #b45309;
      font-weight: 800;
      font-size: 18px;
    }

    .math-outer {
      color: #1e40af;
      font-weight: 700;
      font-size: 18px;
    }

    /* Directional Indicator Badge */
    .instruction-card {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 700;
      padding: 8px 14px;
      border-radius: 8px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
      transition: all 0.3s ease;
    }

    .badge-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      color: #fff;
      font-size: 12px;
      font-weight: 800;
    }

    .step-1-color .badge-num { background: #f59e0b; }
    .step-1-color { border-color: #fde68a; color: #b45309; }

    .step-2-color .badge-num { background: #2563eb; }
    .step-2-color { border-color: #bfdbfe; color: #1e40af; }
  </style>
</head>
<body>

  
  <div class="stepper">
    <button class="step-btn active-1" id="btn1" onclick="setStep(1)">1. Innermost ( )</button>
    <button class="step-btn" id="btn2" onclick="setStep(2)">2. Outer [ ]</button>
  </div>

  <div class="diagram-area">
    
    <div class="outer-box" id="outerBox">
      <span class="box-tag outer-tag">[ Outer Box ]</span>
      
      <div class="outer-content">
        <span class="symbol-outer">[</span>
        <span class="math-outer">3 +</span>
        
        
        <div class="inner-box highlight" id="innerBox">
          <span class="box-tag inner-tag">( Inside )</span>
          <span class="symbol-inner">(</span>
          <span class="math-inner">4 × 5</span>
          <span class="symbol-inner">)</span>
        </div>

        <span class="symbol-outer">]</span>
      </div>
    </div>

    
    <div class="instruction-card step-1-color" id="infoCard">
      <span class="badge-num" id="badgeNum">1</span>
      <span id="instructionText">Step 1: Solve Innermost Parentheses First</span>
    </div>
  </div>

  <script>
    let currentStep = 1;

    function setStep(step) {
      currentStep = step;
      const btn1 = document.getElementById('btn1');
      const btn2 = document.getElementById('btn2');
      const outer = document.getElementById('outerBox');
      const inner = document.getElementById('innerBox');
      const card = document.getElementById('infoCard');
      const num = document.getElementById('badgeNum');
      const text = document.getElementById('instructionText');

      if (step === 1) {
        btn1.className = 'step-btn active-1';
        btn2.className = 'step-btn';
        inner.classList.add('highlight');
        outer.classList.remove('highlight');
        card.className = 'instruction-card step-1-color';
        num.textContent = '1';
        text.textContent = 'Step 1: Solve Innermost Parentheses First';
      } else {
        btn1.className = 'step-btn';
        btn2.className = 'step-btn active-2';
        inner.classList.remove('highlight');
        outer.classList.add('highlight');
        card.className = 'instruction-card step-2-color';
        num.textContent = '2';
        text.textContent = 'Step 2: Solve Outer Brackets Next';
      }
    }

    // Auto cycle gently every 3.5s if untouched
    let timer = setInterval(() => {
      setStep(currentStep === 1 ? 2 : 1);
    }, 3500);

    // Stop auto-play on user tap
    document.querySelectorAll('button').forEach(b => {
      b.addEventListener('click', () => clearInterval(timer), { once: true });
    });
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      width: 100%;
      min-height: 100%;
      background: #f8fafc;
      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;
    }

    .flow-container {
      width: 100%;
      max-width: 420px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
    }

    .step-card {
      width: 100%;
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      transition: all 0.3s ease;
      cursor: pointer;
    }

    .step-card.active {
      border-color: #22b7ff;
      box-shadow: 0 4px 12px rgba(34, 183, 255, 0.15);
      transform: scale(1.02);
    }

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

    .step-num {
      font-size: 12px;
      font-weight: 700;
      color: #64748b;
      background: #f1f5f9;
      width: 22px;
      height: 22px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }

    .step-card.active .step-num {
      background: #22b7ff;
      color: #ffffff;
    }

    .math-expr {
      font-size: 19px;
      font-weight: 600;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-grow: 1;
    }

    /* Highlight Badges */
    .hl-gold {
      background: #fef3c7;
      color: #b45309;
      border: 1.5px solid #f59e0b;
      padding: 2px 6px;
      border-radius: 6px;
      font-weight: 700;
    }

    .hl-blue {
      background: #e0f2fe;
      color: #0369a1;
      border: 1.5px solid #0ea5e9;
      padding: 2px 6px;
      border-radius: 6px;
      font-weight: 700;
    }

    .hl-green {
      background: #dcfce7;
      color: #15803d;
      border: 1.5px solid #22c55e;
      padding: 3px 12px;
      border-radius: 8px;
      font-weight: 800;
      font-size: 22px;
    }

    /* Connecting Arrows */
    .flow-arrow {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
      padding: 1px 0;
    }

    .arrow-icon {
      font-size: 14px;
      color: #94a3b8;
      line-height: 1;
    }

    .calc-tag {
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      padding: 1px 8px;
      border-radius: 10px;
      color: #475569;
    }

    /* Controls */
    .controls {
      margin-top: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #1e2945;
      padding: 6px 14px;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: background 0.2s;
    }

    .btn:hover {
      background: #f1f5f9;
    }

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

    .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
    }

    .dot.active {
      background: #22b7ff;
      transform: scale(1.3);
    }
  </style>
</head>
<body>

  <div class="flow-container">
    
    <div class="step-card active" data-step="0">
      <div class="step-num">1</div>
      <div class="math-expr">
        2 × [5 + <span class="hl-gold">(4 − 1)</span>]
      </div>
    </div>

    
    <div class="flow-arrow">
      <span class="arrow-icon">↓</span>
      <span class="calc-tag">4 − 1 = 3</span>
    </div>

    
    <div class="step-card" data-step="1">
      <div class="step-num">2</div>
      <div class="math-expr">
        2 × <span class="hl-blue">[5 + 3]</span>
      </div>
    </div>

    
    <div class="flow-arrow">
      <span class="arrow-icon">↓</span>
      <span class="calc-tag">5 + 3 = 8</span>
    </div>

    
    <div class="step-card" data-step="2">
      <div class="step-num">3</div>
      <div class="math-expr">
        2 × 8
      </div>
    </div>

    
    <div class="flow-arrow">
      <span class="arrow-icon">↓</span>
      <span class="calc-tag">2 × 8</span>
    </div>

    
    <div class="step-card" data-step="3">
      <div class="step-num">4</div>
      <div class="math-expr">
        <span class="hl-green">16</span>
      </div>
    </div>
  </div>

  
  <div class="controls">
    <button class="btn" id="playBtn">⏸ Pause</button>
    <div class="dots">
      <div class="dot active" data-step="0"></div>
      <div class="dot" data-step="1"></div>
      <div class="dot" data-step="2"></div>
      <div class="dot" data-step="3"></div>
    </div>
  </div>

  <script>
    const cards = document.querySelectorAll('.step-card');
    const dots = document.querySelectorAll('.dot');
    const playBtn = document.getElementById('playBtn');

    let currentStep = 0;
    let isPlaying = true;
    let timer = null;

    function setStep(idx) {
      currentStep = idx;
      cards.forEach((c, i) => {
        c.classList.remove('active', 'dimmed');
        if (i === currentStep) {
          c.classList.add('active');
        } else {
          c.classList.add('dimmed');
        }
      });

      dots.forEach((d, i) => {
        d.classList.toggle('active', i === currentStep);
      });
    }

    function nextStep() {
      setStep((currentStep + 1) % cards.length);
    }

    function startTimer() {
      if (timer) clearInterval(timer);
      timer = setInterval(nextStep, 3500);
      isPlaying = true;
      playBtn.textContent = '⏸ Pause';
    }

    function pauseTimer() {
      if (timer) clearInterval(timer);
      timer = null;
      isPlaying = false;
      playBtn.textContent = '▶ Play';
    }

    playBtn.addEventListener('click', () => {
      if (isPlaying) {
        pauseTimer();
      } else {
        nextStep();
        startTimer();
      }
    });

    cards.forEach((c, i) => {
      c.addEventListener('click', () => {
        setStep(i);
        pauseTimer();
      });
    });

    dots.forEach((d, i) => {
      d.addEventListener('click', () => {
        setStep(i);
        pauseTimer();
      });
    });

    // Start playback
    startTimer();
  </script>
</body>
</html>

OGM.6.OA.1

Aligned learning resources

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