<!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%;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      background: transparent;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 16px;
      user-select: none;
      -webkit-user-select: none;
    }

    .story-container {
      width: 100%;
      max-width: 620px;
      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;
    }

    .story-card {
      flex: 1;
      min-width: 0;
      background: #ffffff;
      border-radius: 18px;
      border: 3px solid transparent;
      padding: 14px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
      transition: box-shadow 0.25s ease, background-color 0.25s ease, opacity 0.25s ease;
      opacity: 0.7;
    }

    .story-card.c1 {
      border-color: #93c5fd;
      background-color: #f8faff;
    }

    .story-card.c2 {
      border-color: #fde047;
      background-color: #fefdf0;
    }

    .story-card.c3 {
      border-color: #86efac;
      background-color: #f6fdf8;
    }

    .story-card.active {
      opacity: 1;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12), 0 0 0 3px #22b7ff;
      background-color: #ffffff;
    }

    .emoji-box {
      font-size: 42px;
      line-height: 1.1;
      margin-bottom: 8px;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.08));
    }

    .order-badge {
      font-size: 13px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      padding: 3px 8px;
      border-radius: 12px;
      margin-bottom: 4px;
      color: #1e2945;
    }

    .c1 .order-badge { background: #dbeafe; color: #1d4ed8; }
    .c2 .order-badge { background: #fef08a; color: #a16207; }
    .c3 .order-badge { background: #bbf7d0; color: #15803d; }

    .action-text {
      font-size: 14px;
      font-weight: 700;
      color: #334155;
      line-height: 1.25;
    }

    .arrow-icon {
      font-size: 22px;
      color: #94a3b8;
      font-weight: bold;
      flex-shrink: 0;
    }

    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      margin-top: 4px;
    }

    .ctrl-btn {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 50%;
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      cursor: pointer;
      color: #1e2945;
      box-shadow: 0 2px 6px rgba(0,0,0,0.05);
      transition: background-color 0.2s, box-shadow 0.2s;
    }

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

    .dots-container {
      display: flex;
      gap: 8px;
      align-items: center;
    }

    .dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      transition: background-color 0.2s, transform 0.2s;
    }

    .dot.active {
      background: #22b7ff;
      transform: scale(1.25);
    }

    @media (max-width: 440px) {
      .cards-row {
        flex-direction: column;
        gap: 8px;
      }
      .story-card {
        width: 100%;
        flex-direction: row;
        justify-content: flex-start;
        padding: 10px 16px;
        gap: 16px;
        text-align: left;
      }
      .card-content {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
      }
      .emoji-box {
        font-size: 36px;
        margin-bottom: 0;
      }
      .arrow-icon {
        transform: rotate(90deg);
        margin: -4px 0;
      }
    }
  </style>
</head>
<body>
  <div class="story-container">
    <div class="cards-row">
      
      <div class="story-card c1 active" id="card-0" onclick="selectStep(0)">
        <div class="emoji-box">🎂</div>
        <div class="card-content">
          <div class="order-badge">1. First</div>
          <div class="action-text">Blew out<br>candles</div>
        </div>
      </div>

      <div class="arrow-icon">→</div>

      
      <div class="story-card c2" id="card-1" onclick="selectStep(1)">
        <div class="emoji-box">🍰</div>
        <div class="card-content">
          <div class="order-badge">2. Next</div>
          <div class="action-text">Ate yummy<br>cake</div>
        </div>
      </div>

      <div class="arrow-icon">→</div>

      
      <div class="story-card c3" id="card-2" onclick="selectStep(2)">
        <div class="emoji-box">🎁</div>
        <div class="card-content">
          <div class="order-badge">3. Last</div>
          <div class="action-text">Opened<br>a gift</div>
        </div>
      </div>
    </div>

    
    <div class="controls">
      <button class="ctrl-btn" id="playBtn" onclick="togglePlay()" aria-label="Play or Pause">⏸</button>
      <div class="dots-container">
        <div class="dot active" id="dot-0" onclick="selectStep(0)"></div>
        <div class="dot" id="dot-1" onclick="selectStep(1)"></div>
        <div class="dot" id="dot-2" onclick="selectStep(2)"></div>
      </div>
    </div>
  </div>

  <script>
    let currentStep = 0;
    const totalSteps = 3;
    let isPlaying = true;
    let timer = null;

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

    function updateView() {
      for (let i = 0; i < totalSteps; i++) {
        const card = document.getElementById(`card-${i}`);
        const dot = document.getElementById(`dot-${i}`);
        if (i === currentStep) {
          card.classList.add('active');
          dot.classList.add('active');
        } else {
          card.classList.remove('active');
          dot.classList.remove('active');
        }
      }
    }

    function selectStep(stepIndex, userTriggered = true) {
      currentStep = stepIndex;
      updateView();
      if (userTriggered) {
        const pitches = [392.00, 440.00, 523.25]; // G4, A4, C5
        playTone(pitches[stepIndex]);
      }
    }

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

    function startTimer() {
      stopTimer();
      timer = setInterval(nextStep, 3000);
    }

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

    function togglePlay() {
      isPlaying = !isPlaying;
      const btn = document.getElementById('playBtn');
      if (isPlaying) {
        btn.textContent = '⏸';
        startTimer();
      } else {
        btn.textContent = '▶';
        stopTimer();
      }
    }

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

Recounting a Personal Experience in Order

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      background-color: #f8f9fa;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      align-items: center;
      padding: 16px 12px;
      min-height: 100%;
      user-select: none;
    }

    .scene {
      width: 100%;
      max-width: 600px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
      margin-top: 10px;
    }

    /* Track Area */
    .train-stage {
      width: 100%;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: flex-end;
      padding-bottom: 22px;
    }

    .track {
      position: absolute;
      bottom: 12px;
      left: 0;
      right: 0;
      height: 10px;
      border-top: 3px solid #64748b;
      border-bottom: 3px solid #64748b;
      background: repeating-linear-gradient(
        90deg,
        #94a3b8 0,
        #94a3b8 6px,
        transparent 6px,
        transparent 18px
      );
    }

    /* Train Layout */
    .train {
      display: flex;
      align-items: flex-end;
      gap: 8px;
      position: relative;
      z-index: 2;
    }

    /* Cars */
    .car-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      cursor: pointer;
      transition: transform 0.3s ease;
    }

    .car-wrapper.active {
      transform: translateY(-8px);
    }

    .sparkle {
      font-size: 16px;
      height: 20px;
      line-height: 20px;
      opacity: 0;
      transition: opacity 0.3s ease;
      color: #eab308;
    }

    .car-wrapper.active .sparkle {
      opacity: 1;
    }

    .car {
      width: 96px;
      height: 118px;
      border-radius: 14px 14px 6px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 8px 6px;
      position: relative;
      border: 2px solid rgba(0, 0, 0, 0.08);
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.04);
      transition: box-shadow 0.3s ease, border-color 0.3s ease;
    }

    .car-wrapper.active .car {
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
      border-color: rgba(0, 0, 0, 0.2);
    }

    /* Car Colors */
    .car-1 { background-color: #e0f2fe; }
    .car-2 { background-color: #fef3c7; }
    .car-3 { background-color: #dcfce7; }
    .locomotive { 
      background-color: #fee2e2; 
      width: 70px;
      height: 104px;
      border-radius: 20px 8px 6px 6px;
    }

    /* Car Content */
    .num-badge {
      width: 26px;
      height: 26px;
      border-radius: 50%;
      background: #ffffff;
      color: #1e2945;
      font-weight: 800;
      font-size: 15px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.06);
    }

    .icon-box {
      font-size: 30px;
      line-height: 1;
      margin: 2px 0;
    }

    .label-tag {
      font-size: 14px;
      font-weight: 700;
      letter-spacing: 0.3px;
      background: #ffffff;
      padding: 2px 8px;
      border-radius: 10px;
      color: #1e2945;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    }

    /* Engine Details */
    .chimney {
      position: absolute;
      top: -12px;
      right: 14px;
      width: 12px;
      height: 14px;
      background: #94a3b8;
      border-radius: 3px 3px 0 0;
    }

    .loco-icon {
      font-size: 26px;
      margin-top: 14px;
    }

    .loco-label {
      font-size: 12px;
      font-weight: 700;
      color: #64748b;
      margin-bottom: 6px;
    }

    /* Couplers & Wheels */
    .wheels {
      display: flex;
      justify-content: space-around;
      width: 80%;
      margin-top: -6px;
      position: relative;
      z-index: 3;
    }

    .wheel {
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: #334155;
      border: 3px solid #94a3b8;
    }

    .coupler {
      width: 8px;
      height: 4px;
      background: #64748b;
      align-self: center;
      margin-bottom: 8px;
    }

    /* Flow Indicator */
    .sequence-flow {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      margin-top: 6px;
      font-size: 13px;
      font-weight: 700;
      color: #64748b;
    }

    .flow-arrow {
      color: #94a3b8;
      font-size: 14px;
    }

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

    .nav-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #1e2945;
      border-radius: 20px;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      outline: none;
    }

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

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

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

    .step-dot.active {
      background: #0284c7;
    }

    /* Responsive adjustments */
    @media (max-width: 420px) {
      .car {
        width: 78px;
        height: 104px;
        padding: 6px 4px;
      }
      .locomotive {
        width: 58px;
        height: 94px;
      }
      .icon-box {
        font-size: 24px;
      }
      .label-tag {
        font-size: 12px;
        padding: 2px 6px;
      }
      .num-badge {
        width: 22px;
        height: 22px;
        font-size: 13px;
      }
      .train {
        gap: 4px;
      }
    }
  </style>
</head>
<body>

  <div class="scene">
    <div class="train-stage">
      <div class="track"></div>

      <div class="train">
        
        <div class="car-wrapper active" data-step="0">
          <div class="sparkle">✦</div>
          <div class="car car-1">
            <div class="num-badge">1</div>
            <div class="icon-box">👟</div>
            <div class="label-tag">First</div>
          </div>
          <div class="wheels">
            <div class="wheel"></div>
            <div class="wheel"></div>
          </div>
        </div>

        <div class="coupler"></div>

        
        <div class="car-wrapper" data-step="1">
          <div class="sparkle">✦</div>
          <div class="car car-2">
            <div class="num-badge">2</div>
            <div class="icon-box">🛝</div>
            <div class="label-tag">Next</div>
          </div>
          <div class="wheels">
            <div class="wheel"></div>
            <div class="wheel"></div>
          </div>
        </div>

        <div class="coupler"></div>

        
        <div class="car-wrapper" data-step="2">
          <div class="sparkle">✦</div>
          <div class="car car-3">
            <div class="num-badge">3</div>
            <div class="icon-box">🍦</div>
            <div class="label-tag">Last</div>
          </div>
          <div class="wheels">
            <div class="wheel"></div>
            <div class="wheel"></div>
          </div>
        </div>

        <div class="coupler"></div>

        
        <div class="car-wrapper" style="cursor: default;">
          <div class="sparkle" style="visibility: hidden;">✦</div>
          <div class="car locomotive">
            <div class="chimney"></div>
            <div class="loco-icon">🚂</div>
            <div class="loco-label">Order →</div>
          </div>
          <div class="wheels">
            <div class="wheel"></div>
            <div class="wheel"></div>
          </div>
        </div>
      </div>
    </div>

    
    <div class="sequence-flow">
      <span>1. First</span>
      <span class="flow-arrow">➔</span>
      <span>2. Next</span>
      <span class="flow-arrow">➔</span>
      <span>3. Last</span>
    </div>
  </div>

  
  <div class="controls">
    <button class="nav-btn" id="playBtn" aria-label="Toggle autoplay">
      <span id="playIcon">⏸</span> Pause
    </button>
    <div class="dots">
      <button class="step-dot active" data-step="0" aria-label="Step 1"></button>
      <button class="step-dot" data-step="1" aria-label="Step 2"></button>
      <button class="step-dot" data-step="2" aria-label="Step 3"></button>
    </div>
  </div>

  <script>
    const cars = document.querySelectorAll('.car-wrapper[data-step]');
    const dots = document.querySelectorAll('.step-dot');
    const playBtn = document.getElementById('playBtn');
    const playIcon = document.getElementById('playIcon');

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

    function setStep(index) {
      currentStep = index;
      cars.forEach((car, i) => {
        car.classList.toggle('active', i === currentStep);
      });
      dots.forEach((dot, i) => {
        dot.classList.toggle('active', i === currentStep);
      });
    }

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

    function startTimer() {
      stopTimer();
      stepTimer = setInterval(nextStep, 3200);
    }

    function stopTimer() {
      if (stepTimer) {
        clearInterval(stepTimer);
        stepTimer = null;
      }
    }

    function togglePlay() {
      isPlaying = !isPlaying;
      if (isPlaying) {
        playIcon.textContent = '⏸';
        playBtn.innerHTML = '<span>⏸</span> Pause';
        startTimer();
      } else {
        playIcon.textContent = '▶';
        playBtn.innerHTML = '<span>▶</span> Play';
        stopTimer();
      }
    }

    // Event Listeners
    cars.forEach((car, index) => {
      car.addEventListener('click', () => {
        setStep(index);
        if (isPlaying) startTimer(); // reset step interval
      });
    });

    dots.forEach((dot, index) => {
      dot.addEventListener('click', () => {
        setStep(index);
        if (isPlaying) startTimer();
      });
    });

    playBtn.addEventListener('click', togglePlay);

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

OGE.0.SL.2

Aligned learning resources

Related diagrams