<!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">
  <script src="{{VENDOR_CDN}}/classace-diagram.js"></script>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

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

    .scene-container {
      width: 100%;
      max-width: 380px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
    }

    /* Status Header Badge */
    .status-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 15px;
      font-weight: 700;
      padding: 6px 16px;
      border-radius: 20px;
      transition: all 0.4s ease;
      min-width: 170px;
    }

    .status-badge.upside-down {
      background: #fee2e2;
      color: #dc2626;
      border: 1px solid #fecaca;
    }

    .status-badge.right-side-up {
      background: #e0f2fe;
      color: #0284c7;
      border: 1px solid #bae6fd;
    }

    /* Book Stage Area */
    .stage {
      position: relative;
      width: 230px;
      height: 170px;
      display: flex;
      align-items: center;
      justify-content: center;
      perspective: 800px;
    }

    /* Rotating Book */
    .book {
      width: 220px;
      height: 160px;
      background: #ffffff;
      border: 2px solid #e6e6e6;
      border-left: 10px solid #22b7ff;
      border-radius: 6px 12px 12px 6px;
      box-shadow: 0 6px 18px rgba(30, 41, 69, 0.08);
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 12px 16px;
      transition: transform 0.8s cubic-bezier(0.34, 1.3, 0.64, 1);
      transform-origin: center center;
    }

    .book.upside-down {
      transform: rotate(180deg);
    }

    .book.right-side-up {
      transform: rotate(0deg);
    }

    /* Book Inside Content */
    .sky-row {
      display: flex;
      justify-content: flex-end;
      font-size: 24px;
      line-height: 1;
    }

    .ground-row {
      display: flex;
      align-items: flex-end;
      justify-content: space-around;
      border-bottom: 5px solid #86efac;
      padding-bottom: 2px;
    }

    .tree {
      font-size: 38px;
      line-height: 1;
    }

    .bear {
      font-size: 42px;
      line-height: 1;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.1));
    }

    /* Animated Rotation Indicator */
    .turn-guide {
      position: absolute;
      right: -24px;
      top: 50%;
      transform: translateY(-50%);
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid #e6e6e6;
      box-shadow: 0 2px 8px rgba(0,0,0,0.06);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #22b7ff;
      font-size: 20px;
      font-weight: bold;
      pointer-events: none;
      transition: transform 0.8s ease;
    }

    .turn-guide.active {
      transform: translateY(-50%) rotate(180deg);
    }

    /* Interactive Stepper Tabs */
    .control-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      width: 100%;
    }

    .step-btn {
      flex: 1;
      max-width: 150px;
      background: #f8fafc;
      border: 1px solid #e6e6e6;
      color: #1e2945;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: all 0.2s ease;
    }

    .step-btn.active {
      background: #22b7ff;
      color: #ffffff;
      border-color: #22b7ff;
      box-shadow: 0 2px 8px rgba(34, 183, 255, 0.3);
    }

    .flip-btn {
      width: 38px;
      height: 38px;
      border-radius: 8px;
      border: 1px solid #e6e6e6;
      background: #ffffff;
      color: #1e2945;
      font-size: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: background 0.2s;
    }

    .flip-btn:hover {
      background: #f1f5f9;
    }
  </style>
</head>
<body>
  <div class="scene-container">
    <div id="badge" class="status-badge upside-down">
      <span id="badgeIcon">✕</span>
      <span id="badgeText">Upside Down!</span>
    </div>

    <div class="stage">
      <div id="book" class="book upside-down">
        <div class="sky-row">
          <span>☀️</span>
        </div>
        <div class="ground-row">
          <span class="tree">🌲</span>
          <span class="bear">🧸</span>
        </div>
      </div>
      <div id="turnGuide" class="turn-guide">↻</div>
    </div>

    <div class="control-row">
      <button id="btn0" class="step-btn active" onclick="setOrientation(0)">
        <span>1.</span> Upside Down
      </button>
      <button id="btn1" class="step-btn" onclick="setOrientation(1)">
        <span>2.</span> Right-Side Up
      </button>
      <button class="flip-btn" title="Flip book" onclick="toggleOrientation()">↻</button>
    </div>
  </div>

  <script>
    let state = 0; // 0: Upside down, 1: Right-side up
    let autoTimer = null;

    const book = document.getElementById('book');
    const badge = document.getElementById('badge');
    const badgeIcon = document.getElementById('badgeIcon');
    const badgeText = document.getElementById('badgeText');
    const turnGuide = document.getElementById('turnGuide');
    const btn0 = document.getElementById('btn0');
    const btn1 = document.getElementById('btn1');

    function updateView() {
      if (state === 0) {
        book.className = 'book upside-down';
        badge.className = 'status-badge upside-down';
        badgeIcon.textContent = '✕';
        badgeText.textContent = 'Upside Down!';
        turnGuide.className = 'turn-guide';
        btn0.classList.add('active');
        btn1.classList.remove('active');
      } else {
        book.className = 'book right-side-up';
        badge.className = 'status-badge right-side-up';
        badgeIcon.textContent = '✓';
        badgeText.textContent = 'Right-Side Up!';
        turnGuide.className = 'turn-guide active';
        btn1.classList.add('active');
        btn0.classList.remove('active');
      }
    }

    function setOrientation(newState) {
      state = newState;
      updateView();
      resetTimer();
    }

    function toggleOrientation() {
      state = (state === 0) ? 1 : 0;
      updateView();
      resetTimer();
    }

    function resetTimer() {
      clearInterval(autoTimer);
      autoTimer = setInterval(() => {
        state = (state === 0) ? 1 : 0;
        updateView();
      }, 3600);
    }

    // Initialize auto loop
    resetTimer();
  </script>
</body>
</html>

Holding a Book and Turning Pages

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>Turn from Right to Left</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #fdfbf7;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 12px;
      min-height: 100%;
      user-select: none;
    }

    /* Header Banner */
    .banner {
      background: #e0f2fe;
      border: 1.5px solid #bae6fd;
      color: #0369a1;
      padding: 6px 16px;
      border-radius: 999px;
      font-weight: 700;
      font-size: 15px;
      display: flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    }
    .banner .arrow-badge {
      background: #0284c7;
      color: #fff;
      padding: 1px 6px;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 800;
      letter-spacing: 0.5px;
    }

    /* Wooden Desk & Book Stage */
    .stage {
      width: 100%;
      max-width: 440px;
      aspect-ratio: 16 / 10;
      background: #ecd9c6;
      border-radius: 16px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: inset 0 -4px 0 rgba(0,0,0,0.08), inset 0 2px 4px rgba(255,255,255,0.6);
      margin: 8px 0;
      overflow: hidden;
    }

    /* Direction Arrow Guide */
    .arrow-guide {
      position: absolute;
      top: 14%;
      width: 60%;
      height: 36px;
      pointer-events: none;
      z-index: 20;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: opacity 0.4s ease;
    }
    .arrow-svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    /* Open Book */
    .book-container {
      width: 78%;
      height: 72%;
      position: relative;
      perspective: 1200px;
      display: flex;
    }

    .book-spine-shadow {
      position: absolute;
      left: 50%;
      top: 0;
      bottom: 0;
      width: 16px;
      transform: translateX(-50%);
      background: linear-gradient(to right, rgba(0,0,0,0.12), rgba(0,0,0,0.02) 50%, rgba(0,0,0,0.12));
      z-index: 10;
      pointer-events: none;
    }

    /* Left Page (Fixed) */
    .page-left {
      width: 50%;
      height: 100%;
      background: #ffffff;
      border-top-left-radius: 6px;
      border-bottom-left-radius: 6px;
      box-shadow: -2px 3px 8px rgba(0,0,0,0.08);
      border-right: 1px solid #e2e8f0;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px;
      position: relative;
      z-index: 2;
    }

    /* Right Base Page (Revealed after turn) */
    .page-right-base {
      width: 50%;
      height: 100%;
      background: #fffbeb;
      border-top-right-radius: 6px;
      border-bottom-right-radius: 6px;
      box-shadow: 2px 3px 8px rgba(0,0,0,0.08);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px;
      position: relative;
    }

    /* Page Content Graphics */
    .page-art {
      font-size: 38px;
      line-height: 1;
      margin-bottom: 6px;
      filter: drop-shadow(0 2px 3px rgba(0,0,0,0.1));
    }
    .page-lines {
      width: 60%;
      height: 4px;
      background: #e2e8f0;
      border-radius: 2px;
      margin: 3px 0;
    }
    .page-lines.short { width: 40%; }

    /* Flipping Page */
    .page-turner {
      position: absolute;
      top: 0;
      right: 0;
      width: 50%;
      height: 100%;
      transform-origin: left center;
      transform-style: preserve-3d;
      transition: transform 1.2s cubic-bezier(0.35, 0, 0.25, 1);
      z-index: 5;
    }

    .flipper-face {
      position: absolute;
      inset: 0;
      backface-visibility: hidden;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px;
      border-radius: 0 6px 6px 0;
    }

    .flipper-front {
      background: #ffffff;
      box-shadow: 2px 3px 8px rgba(0,0,0,0.06);
      border-left: 1px solid #f1f5f9;
    }

    .flipper-back {
      background: #ffffff;
      transform: rotateY(180deg);
      border-radius: 6px 0 0 6px;
      box-shadow: -2px 3px 8px rgba(0,0,0,0.06);
      border-right: 1px solid #f1f5f9;
    }

    /* Corner Pinch Indicator */
    .pinch-target {
      position: absolute;
      top: 4px;
      right: 4px;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: rgba(34, 183, 255, 0.2);
      border: 1.5px dashed #0284c7;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* Hand / Pinch overlay */
    .hand-cursor {
      position: absolute;
      top: 6px;
      right: 6px;
      font-size: 28px;
      z-index: 30;
      transform-origin: center;
      transition: all 1.2s cubic-bezier(0.35, 0, 0.25, 1);
      filter: drop-shadow(0 3px 4px rgba(0,0,0,0.18));
      pointer-events: none;
    }

    /* Step states */
    /* State 0: Resting / Grip */
    .step-0 .page-turner { transform: rotateY(0deg); }
    .step-0 .hand-cursor { transform: translate(0, 0) scale(1.05); }

    /* State 1: Turning mid-way */
    .step-1 .page-turner { transform: rotateY(-90deg); }
    .step-1 .hand-cursor { transform: translate(-100px, -15px) rotate(-15deg); }

    /* State 2: Fully turned */
    .step-2 .page-turner { transform: rotateY(-180deg); }
    .step-2 .hand-cursor { transform: translate(-180px, 10px) opacity(0); }

    /* Controls Bar */
    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      width: 100%;
      max-width: 440px;
    }
    .step-btn {
      flex: 1;
      padding: 8px 6px;
      border: 1.5px solid #e2e8f0;
      background: #ffffff;
      color: #64748b;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      transition: all 0.2s ease;
    }
    .step-btn.active {
      background: #f0f9ff;
      border-color: #0284c7;
      color: #0284c7;
      box-shadow: 0 1px 3px rgba(2, 132, 199, 0.15);
    }
    .play-btn {
      width: 36px;
      height: 36px;
      flex-shrink: 0;
      border: 1.5px solid #bae6fd;
      background: #e0f2fe;
      color: #0369a1;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
    }
    .play-btn:active { background: #bae6fd; }
  </style>
</head>
<body>

  
  <div class="banner">
    <span>Turn from Right to Left</span>
    <span class="arrow-badge">R ➔ L</span>
  </div>

  
  <div class="stage" id="stage">
    
    
    <div class="arrow-guide">
      <svg class="arrow-svg" viewBox="0 0 200 40">
        <defs>
          <marker id="arrowhead" markerWidth="6" markerHeight="6" refX="5" refY="3" orient="auto">
            <polygon points="6 0, 0 3, 6 6" fill="#0284c7" />
          </marker>
        </defs>
        <path d="M 175 25 Q 100 5, 25 25" fill="none" stroke="#0284c7" stroke-width="2.5" stroke-dasharray="4 4" marker-end="url(#arrowhead)"/>
      </svg>
    </div>

    
    <div class="book-container">
      <div class="book-spine-shadow"></div>

      
      <div class="page-left">
        <div class="page-art">🧸</div>
        <div class="page-lines"></div>
        <div class="page-lines short"></div>
      </div>

      
      <div class="page-right-base">
        <div class="page-art">☀️</div>
        <div class="page-lines"></div>
        <div class="page-lines short"></div>
      </div>

      
      <div class="page-turner" id="turner">
        
        <div class="flipper-face flipper-front">
          <div class="pinch-target"></div>
          <div class="page-art">📖</div>
          <div class="page-lines"></div>
          <div class="page-lines short"></div>
        </div>
        
        <div class="flipper-face flipper-back">
          <div class="page-art">⭐</div>
          <div class="page-lines"></div>
          <div class="page-lines short"></div>
        </div>
      </div>

      
      <div class="hand-cursor" id="hand">🤏</div>
    </div>
  </div>

  
  <div class="controls">
    <button class="play-btn" id="playToggle" title="Play/Pause">⏸</button>
    <button class="step-btn active" id="btn0">1. Pinch Corner</button>
    <button class="step-btn" id="btn1">2. Turn Left</button>
    <button class="step-btn" id="btn2">3. New Page</button>
  </div>

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

    const stage = document.getElementById('stage');
    const playToggle = document.getElementById('playToggle');
    const buttons = [
      document.getElementById('btn0'),
      document.getElementById('btn1'),
      document.getElementById('btn2')
    ];

    function applyStep(step) {
      currentStep = step;
      stage.className = 'stage step-' + step;
      buttons.forEach((btn, idx) => {
        if (idx === step) {
          btn.classList.add('active');
        } else {
          btn.classList.remove('active');
        }
      });
    }

    function nextStep() {
      const next = (currentStep + 1) % 3;
      applyStep(next);
    }

    function startAutoplay() {
      if (timer) clearInterval(timer);
      timer = setInterval(nextStep, 2200);
      isPlaying = true;
      playToggle.textContent = '⏸';
    }

    function pauseAutoplay() {
      if (timer) clearInterval(timer);
      isPlaying = false;
      playToggle.textContent = '▶';
    }

    // Button interactions
    buttons.forEach((btn, idx) => {
      btn.addEventListener('click', () => {
        pauseAutoplay();
        applyStep(idx);
      });
    });

    playToggle.addEventListener('click', () => {
      if (isPlaying) {
        pauseAutoplay();
      } else {
        nextStep();
        startAutoplay();
      }
    });

    // Initialize in Step 0
    applyStep(0);
    startAutoplay();
  </script>
</body>
</html>

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

    body {
      background-color: #fdfbf7;
      color: #1e2945;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      min-height: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 16px;
    }

    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      width: 100%;
      max-width: 520px;
    }

    .side-card {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
    }

    .card-title {
      font-size: 15px;
      font-weight: 700;
      letter-spacing: 0.3px;
      text-transform: uppercase;
      color: #1e2945;
    }

    .book-wrap {
      width: 100%;
      aspect-ratio: 3 / 4;
      max-width: 220px;
      border-radius: 12px;
      padding: 12px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      position: relative;
      border: 1px solid #e6e6e6;
      box-shadow: 0 4px 12px rgba(30, 41, 69, 0.08);
      user-select: none;
      cursor: pointer;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .book-wrap:active {
      transform: scale(0.98);
    }

    /* Front Cover */
    .book-front {
      background: linear-gradient(135deg, #22b7ff 0%, #0095e8 100%);
      color: #ffffff;
      border-left: 8px solid #0077ba;
    }

    /* Back Cover */
    .book-back {
      background: #f1f5f9;
      color: #64748b;
      border-right: 8px solid #cbd5e1;
    }

    .book-title {
      font-size: 16px;
      font-weight: 800;
      text-align: center;
      line-height: 1.1;
      text-shadow: 0 1px 2px rgba(0,0,0,0.15);
    }

    .bear-art {
      font-size: 52px;
      line-height: 1;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
    }

    .barcode-box {
      background: #ffffff;
      padding: 6px 10px 4px;
      border-radius: 6px;
      border: 1px solid #e2e8f0;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 3px;
      margin: auto 0;
    }

    .barcode-stripes {
      width: 64px;
      height: 28px;
      background: repeating-linear-gradient(
        90deg,
        #1e2945 0px,
        #1e2945 3px,
        transparent 3px,
        transparent 5px,
        #1e2945 5px,
        #1e2945 8px,
        transparent 8px,
        transparent 10px,
        #1e2945 10px,
        #1e2945 12px,
        transparent 12px,
        transparent 15px
      );
    }

    .badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 700;
    }

    .badge-start {
      background-color: #22c55e;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(34, 197, 94, 0.35);
    }

    .badge-end {
      background-color: #e2e8f0;
      color: #475569;
    }

    @media (max-width: 360px) {
      .card-title {
        font-size: 13px;
      }
      .book-title {
        font-size: 14px;
      }
      .bear-art {
        font-size: 42px;
      }
      .badge {
        font-size: 12px;
        padding: 5px 10px;
      }
    }
  </style>
</head>
<body>

  <div class="comparison-grid">
    
    <div class="side-card">
      <div class="card-title">Front Cover</div>
      <div class="book-wrap book-front">
        <div class="book-title">The Happy Bear</div>
        <div class="bear-art">🐻</div>
        <div class="badge badge-start">✓ Start Here!</div>
      </div>
    </div>

    
    <div class="side-card">
      <div class="card-title">Back Cover</div>
      <div class="book-wrap book-back">
        <div class="barcode-box">
          <div class="barcode-stripes"></div>
        </div>
        <div class="badge badge-end">The End</div>
      </div>
    </div>
  </div>

</body>
</html>

OGE.0.RF.1

Aligned learning resources

Related diagrams