<!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>The Grab Test</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      width: 100%;
      min-height: 100%;
      background: #ffffff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px 8px;
    }

    .main-grid {
      display: grid;
      grid-template-columns: 1fr 1px 1fr;
      width: 100%;
      max-width: 620px;
      align-items: stretch;
      gap: 0;
    }

    .divider {
      background: repeating-linear-gradient(
        to bottom,
        #cbd5e1,
        #cbd5e1 6px,
        transparent 6px,
        transparent 12px
      );
      width: 1px;
      height: 100%;
    }

    .panel {
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 8px 12px;
      text-align: center;
      cursor: pointer;
      user-select: none;
      -webkit-user-select: none;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      font-size: 13px;
      font-weight: 700;
      padding: 5px 12px;
      border-radius: 9999px;
      margin-bottom: 8px;
      white-space: nowrap;
    }

    .badge-solid {
      background: #ecfdf5;
      color: #059669;
      border: 1px solid #a7f3d0;
    }

    .badge-flat {
      background: #fff7ed;
      color: #c2410c;
      border: 1px solid #fed7aa;
    }

    .stage-svg {
      width: 100%;
      max-width: 240px;
      height: 180px;
      display: block;
    }

    .caption {
      font-size: 14px;
      font-weight: 600;
      margin-top: 6px;
      line-height: 1.3;
    }

    .caption-solid {
      color: #047857;
    }

    .caption-flat {
      color: #c2410c;
    }

    .hint-btn {
      margin-top: 10px;
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 6px 16px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      transition: background 0.2s, border-color 0.2s;
    }

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

    /* SVG Animation transitions */
    .hand-left, .hand-right, .hand-flat {
      transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
      transform-box: fill-box;
      transform-origin: center;
    }

    .state-grab .hand-left {
      transform: translate(22px, 0);
    }
    .state-grab .hand-right {
      transform: translate(-22px, 0);
    }
    .state-grab .hand-flat {
      transform: translate(0, 26px);
    }

    .state-grab .flat-impact {
      opacity: 1;
    }
    .flat-impact {
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    @media (max-width: 480px) {
      .badge {
        font-size: 11px;
        padding: 4px 8px;
      }
      .caption {
        font-size: 12px;
      }
      .stage-svg {
        height: 150px;
      }
      .hint-btn {
        font-size: 12px;
        padding: 5px 12px;
      }
    }
  </style>
</head>
<body>

  <div class="main-grid" id="grabDemo">
    
    <div class="panel" id="panelSolid" title="Tap to test Solid Object">
      <div class="badge badge-solid">
        <span>✓</span> Hands Wrap Around (Solid)
      </div>

      <svg class="stage-svg" viewBox="0 0 240 180">
        <defs>
          
          <radialGradient id="sphereGrad" cx="35%" cy="30%" r="65%">
            <stop offset="0%" stop-color="#fda4af" />
            <stop offset="25%" stop-color="#f43f5e" />
            <stop offset="70%" stop-color="#be123c" />
            <stop offset="100%" stop-color="#881337" />
          </radialGradient>
          
          <radialGradient id="shadowGrad" cx="50%" cy="50%" r="50%">
            <stop offset="0%" stop-color="rgba(15, 23, 42, 0.3)" />
            <stop offset="100%" stop-color="rgba(15, 23, 42, 0)" />
          </radialGradient>
        </defs>

        
        <ellipse cx="120" cy="148" rx="46" ry="11" fill="url(#shadowGrad)" />

        
        <circle cx="120" cy="95" r="44" fill="url(#sphereGrad)" />
        <ellipse cx="106" cy="74" rx="14" ry="7" fill="#ffffff" opacity="0.4" transform="rotate(-25 106 74)" />

        
        <g class="hand-left">
          
          <path d="M 32 108 C 45 108 58 102 68 96 C 76 91 80 84 84 88 C 88 92 84 99 76 104 C 68 109 56 116 32 118 Z" fill="#fbcfe8" stroke="#f472b6" stroke-width="2" stroke-linejoin="round" />
          
          <path d="M 68 84 C 74 74 88 74 96 82 C 99 85 96 90 92 88 C 86 82 76 82 70 90 Z" fill="#fde047" stroke="#eab308" stroke-width="2" />
          <path d="M 72 92 C 80 84 94 85 101 93 C 104 96 100 101 96 98 C 91 92 82 92 75 99 Z" fill="#fde047" stroke="#eab308" stroke-width="2" />
          <path d="M 70 102 C 78 96 92 98 98 106 C 101 109 97 114 93 111 C 88 106 79 105 73 110 Z" fill="#fde047" stroke="#eab308" stroke-width="2" />
          
          <path d="M 60 76 C 68 68 80 72 84 79 C 86 82 82 85 79 83 C 75 78 68 76 62 82 Z" fill="#fde047" stroke="#eab308" stroke-width="2" />
        </g>

        
        <g class="hand-right">
          
          <path d="M 208 108 C 195 108 182 102 172 96 C 164 91 160 84 156 88 C 152 92 156 99 164 104 C 172 109 184 116 208 118 Z" fill="#fed7aa" stroke="#fb923c" stroke-width="2" stroke-linejoin="round" />
          
          <path d="M 172 84 C 166 74 152 74 144 82 C 141 85 144 90 148 88 C 154 82 164 82 170 90 Z" fill="#fde047" stroke="#eab308" stroke-width="2" />
          <path d="M 168 92 C 160 84 146 85 139 93 C 136 96 140 101 144 98 C 149 92 158 92 165 99 Z" fill="#fde047" stroke="#eab308" stroke-width="2" />
          <path d="M 170 102 C 162 96 148 98 142 106 C 139 109 143 114 147 111 C 152 106 161 105 167 110 Z" fill="#fde047" stroke="#eab308" stroke-width="2" />
          
          <path d="M 180 76 C 172 68 160 72 156 79 C 154 82 158 85 161 83 C 165 78 172 76 178 82 Z" fill="#fde047" stroke="#eab308" stroke-width="2" />
        </g>
      </svg>

      <div class="caption caption-solid">Takes up space — you can hold it!</div>
    </div>

    
    <div class="divider"></div>

    
    <div class="panel" id="panelFlat" title="Tap to test Flat Shape">
      <div class="badge badge-flat">
        <span>✋</span> Hand Stays Flat (Flat Shape)
      </div>

      <svg class="stage-svg" viewBox="0 0 240 180">
        
        <line x1="15" y1="148" x2="225" y2="148" stroke="#e2e8f0" stroke-width="2" stroke-linecap="round" />

        
        <polygon points="40,78 200,78 178,146 22,146" fill="#f8fafc" stroke="#94a3b8" stroke-width="1.5" />

        
        <ellipse cx="106" cy="112" rx="44" ry="20" fill="#ffe4e6" stroke="#e11d48" stroke-width="3" stroke-dasharray="1 0" />
        <ellipse cx="106" cy="112" rx="36" ry="15" fill="none" stroke="#f43f5e" stroke-width="1.5" stroke-dasharray="4 3" />
        <text x="106" y="116" font-size="11" font-weight="700" fill="#e11d48" text-anchor="middle">2D Drawing</text>

        
        <g class="flat-impact">
          <path d="M 52 110 L 42 106" stroke="#ea580c" stroke-width="2" stroke-linecap="round" />
          <path d="M 160 110 L 170 106" stroke="#ea580c" stroke-width="2" stroke-linecap="round" />
          <path d="M 106 142 L 106 150" stroke="#ea580c" stroke-width="2" stroke-linecap="round" />
        </g>

        
        <g class="hand-flat">
          
          <rect x="94" y="8" width="24" height="38" rx="4" fill="#fed7aa" stroke="#fb923c" stroke-width="2" />
          
          <path d="M 82 42 C 82 38 130 38 130 42 L 134 76 C 134 82 78 82 78 76 Z" fill="#fed7aa" stroke="#fb923c" stroke-width="2" />
          
          
          <rect x="76" y="68" width="10" height="36" rx="5" fill="#fde047" stroke="#eab308" stroke-width="1.5" />
          
          <rect x="88" y="70" width="10" height="42" rx="5" fill="#fde047" stroke="#eab308" stroke-width="1.5" />
          
          <rect x="100" y="71" width="11" height="46" rx="5.5" fill="#fde047" stroke="#eab308" stroke-width="1.5" />
          
          <rect x="113" y="70" width="10" height="41" rx="5" fill="#fde047" stroke="#eab308" stroke-width="1.5" />
          
          <path d="M 126 52 C 136 54 146 62 144 70 C 142 74 135 73 130 67 Z" fill="#fde047" stroke="#eab308" stroke-width="1.5" />
        </g>
      </svg>

      <div class="caption caption-flat">Flat on paper — you cannot grasp it!</div>
    </div>
  </div>

  
  <button class="hint-btn" id="toggleBtn">✋ Tap to Test Grab</button>

  <script>
    const demo = document.getElementById('grabDemo');
    const toggleBtn = document.getElementById('toggleBtn');
    let isGrabbing = true;

    function setGrabState(state) {
      isGrabbing = state;
      if (isGrabbing) {
        demo.classList.add('state-grab');
        toggleBtn.textContent = '✋ Tap to Reset Hands';
      } else {
        demo.classList.remove('state-grab');
        toggleBtn.textContent = '✋ Tap to Test Grab';
      }
    }

    // Initialize with grab shown
    setGrabState(true);

    toggleBtn.addEventListener('click', () => {
      setGrabState(!isGrabbing);
    });

    document.getElementById('panelSolid').addEventListener('click', () => {
      setGrabState(!isGrabbing);
    });

    document.getElementById('panelFlat').addEventListener('click', () => {
      setGrabState(!isGrabbing);
    });
  </script>
</body>
</html>

Flat Shapes Versus Solid Objects

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Flat Shapes on Paper</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      user-select: none;
      -webkit-user-select: none;
    }

    body {
      width: 100%;
      min-height: 100vh;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background-color: #d8c4a9;
      background-image: 
        repeating-linear-gradient(0deg, rgba(0,0,0,0.02) 0px, rgba(0,0,0,0.02) 2px, transparent 2px, transparent 36px),
        linear-gradient(180deg, #dfcfb9 0%, #cfbba0 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px 16px;
      color: #1e293b;
    }

    .desk-scene {
      width: 100%;
      max-width: 500px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 14px;
    }

    /* Top Callout Banner */
    .callout {
      background: #ffffff;
      padding: 9px 18px;
      border-radius: 9999px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 15px;
      font-weight: 700;
      color: #1e293b;
      border: 1px solid rgba(0, 0, 0, 0.05);
    }

    .callout .arrow-icon {
      color: #2563eb;
      font-size: 18px;
      line-height: 1;
      font-weight: 900;
    }

    /* Paper on Desk */
    .paper {
      width: 100%;
      background: #ffffff;
      border-radius: 12px;
      box-shadow: 
        0 2px 4px rgba(0, 0, 0, 0.05),
        0 10px 25px rgba(0, 0, 0, 0.12);
      padding: 28px 20px 22px;
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 20px;
      overflow: visible;
    }

    /* Subtle lined paper texture */
    .paper::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-image: linear-gradient(#f1f5f9 1.5px, transparent 1.5px);
      background-size: 100% 30px;
      border-radius: 12px;
      pointer-events: none;
      opacity: 0.75;
    }

    .paper-corner {
      position: absolute;
      top: 0;
      right: 0;
      width: 28px;
      height: 28px;
      background: linear-gradient(135deg, transparent 50%, #cbd5e1 50%);
      border-bottom-left-radius: 6px;
      border-top-right-radius: 12px;
    }

    /* Shapes Container */
    .shapes-row {
      width: 100%;
      display: flex;
      justify-content: space-around;
      align-items: flex-end;
      position: relative;
      z-index: 1;
      gap: 8px;
    }

    .shape-card {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
      cursor: pointer;
      padding: 8px 12px;
      border-radius: 10px;
      transition: background-color 0.2s ease, outline 0.2s ease;
      outline: 2px solid transparent;
    }

    .shape-card:hover {
      background-color: rgba(241, 245, 249, 0.8);
    }

    .shape-card:focus-visible {
      outline: 2px solid #3b82f6;
    }

    .shape-svg-wrap {
      width: 72px;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .shape-svg {
      width: 100%;
      height: 100%;
      display: block;
      filter: drop-shadow(0 2px 3px rgba(0,0,0,0.08));
      transition: filter 0.3s ease;
    }

    .shape-label {
      font-size: 14px;
      font-weight: 700;
      color: #475569;
    }

    /* Attempt to lift animation - smooth 600ms duration */
    .lift-try {
      animation: gentle-shake 0.6s ease-in-out;
    }

    @keyframes gentle-shake {
      0%, 100% { transform: translateY(0) rotate(0deg); }
      20% { transform: translateY(-4px) rotate(-3deg); }
      40% { transform: translateY(-6px) rotate(3deg); }
      60% { transform: translateY(-3px) rotate(-2deg); }
      80% { transform: translateY(-1px) rotate(1deg); }
    }

    /* Bottom Info / Status Bar */
    .paper-footer {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      position: relative;
      z-index: 1;
      margin-top: 4px;
      padding-top: 10px;
      border-top: 1px dashed #e2e8f0;
      gap: 12px;
    }

    .feedback-pill {
      flex: 1;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      padding: 8px 14px;
      border-radius: 8px;
      text-align: center;
      transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
      min-height: 38px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .pencil-container {
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      line-height: 1;
      background: #f1f5f9;
      padding: 6px 8px;
      border-radius: 8px;
      border: 1px solid #e2e8f0;
      flex-shrink: 0;
    }

    @media (max-width: 400px) {
      body {
        padding: 12px 8px;
      }
      .callout {
        font-size: 13px;
        padding: 8px 14px;
      }
      .paper {
        padding: 20px 12px 16px;
        gap: 14px;
      }
      .shape-svg-wrap {
        width: 58px;
        height: 58px;
      }
      .shape-label {
        font-size: 12px;
      }
      .feedback-pill {
        font-size: 12px;
        padding: 6px 8px;
      }
    }
  </style>
</head>
<body>

  <div class="desk-scene">
    
    <div class="callout">
      <span class="arrow-icon">↓</span>
      <span>Flat (2D) — Stays flat on paper</span>
    </div>

    
    <div class="paper">
      <div class="paper-corner"></div>

      
      <div class="shapes-row">
        
        <div class="shape-card" role="button" tabindex="0" onclick="tapShape(this, 'Circle')" onkeydown="handleKey(event, this, 'Circle')">
          <div class="shape-svg-wrap">
            <svg class="shape-svg" viewBox="0 0 70 70">
              <circle cx="35" cy="35" r="30" fill="#ef4444" stroke="#b91c1c" stroke-width="4" />
            </svg>
          </div>
          <span class="shape-label">Circle</span>
        </div>

        
        <div class="shape-card" role="button" tabindex="0" onclick="tapShape(this, 'Square')" onkeydown="handleKey(event, this, 'Square')">
          <div class="shape-svg-wrap">
            <svg class="shape-svg" viewBox="0 0 70 70">
              <rect x="6" y="6" width="58" height="58" rx="8" fill="#3b82f6" stroke="#1d4ed8" stroke-width="4" />
            </svg>
          </div>
          <span class="shape-label">Square</span>
        </div>

        
        <div class="shape-card" role="button" tabindex="0" onclick="tapShape(this, 'Triangle')" onkeydown="handleKey(event, this, 'Triangle')">
          <div class="shape-svg-wrap">
            <svg class="shape-svg" viewBox="0 0 70 70">
              <polygon points="35,6 64,62 6,62" fill="#facc15" stroke="#ca8a04" stroke-width="4" stroke-linejoin="round" />
            </svg>
          </div>
          <span class="shape-label">Triangle</span>
        </div>
      </div>

      
      <div class="paper-footer">
        <div id="feedback" class="feedback-pill">
          💡 Tap a shape to try lifting it off the page!
        </div>
        <div class="pencil-container" title="Drawn with pencil" aria-hidden="true">
          ✏️
        </div>
      </div>
    </div>
  </div>

  <script>
    let resetTimer = null;

    function handleKey(e, card, name) {
      if (e.key === 'Enter' || e.key === ' ') {
        e.preventDefault();
        tapShape(card, name);
      }
    }

    function tapShape(card, name) {
      const svg = card.querySelector('.shape-svg-wrap');
      const pill = document.getElementById('feedback');

      svg.classList.remove('lift-try');
      void svg.offsetWidth; // Force reflow
      svg.classList.add('lift-try');

      pill.textContent = `❌ ${name} is 2D — it stays flat on paper!`;
      pill.style.background = '#fef2f2';
      pill.style.color = '#991b1b';
      pill.style.borderColor = '#fecaca';

      clearTimeout(resetTimer);
      resetTimer = setTimeout(() => {
        pill.textContent = '💡 Tap a shape to try lifting it off the page!';
        pill.style.background = '#f8fafc';
        pill.style.color = '#334155';
        pill.style.borderColor = '#e2e8f0';
      }, 2200);
    }
  </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; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e293b;
      padding: 10px 14px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
    }

    .diagram-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      width: 100%;
      max-width: 600px;
    }

    .column {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .header-area {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      min-height: 46px;
      justify-content: flex-end;
      margin-bottom: 6px;
    }

    .column-title {
      font-size: 17px;
      font-weight: 800;
      letter-spacing: -0.2px;
      line-height: 1.2;
    }

    .flat-title { color: #0284c7; }
    .solid-title { color: #e11d48; }

    .sub-badge {
      font-size: 11px;
      font-weight: 600;
      line-height: 1;
      padding: 3px 8px;
      border-radius: 12px;
    }

    .flat-badge {
      color: #64748b;
      background: #f1f5f9;
    }

    .solid-badge {
      background: #ffe4e6;
      color: #e11d48;
      display: inline-flex;
      align-items: center;
      gap: 3px;
    }

    .svg-container {
      width: 100%;
      max-width: 280px;
    }

    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }

    .labels {
      display: flex;
      justify-content: space-around;
      width: 100%;
      max-width: 250px;
      margin-top: 4px;
      font-size: 11px;
      font-weight: 600;
      color: #475569;
    }

    .sparkle {
      animation: gentleSparkle 3s ease-in-out infinite alternate;
      transform-origin: center;
    }
    .sparkle-2 { animation-delay: 1s; }
    .sparkle-3 { animation-delay: 2s; }

    @keyframes gentleSparkle {
      0% { opacity: 0.35; transform: scale(0.85); }
      50% { opacity: 0.85; transform: scale(1.05); }
      100% { opacity: 1; transform: scale(1.15); }
    }

    @media (max-width: 480px) {
      body {
        padding: 8px 12px;
        justify-content: flex-start;
      }
      .diagram-grid {
        grid-template-columns: 1fr;
        gap: 12px;
        max-width: 320px;
      }
      .header-area {
        min-height: auto;
      }
      .column-title {
        font-size: 15px;
      }
      .svg-container {
        max-width: 240px;
      }
    }
  </style>
</head>
<body>

  <div class="diagram-grid">
    
    <div class="column">
      <div class="header-area">
        <div class="column-title flat-title">Flat (2D)</div>
        <div class="sub-badge flat-badge">Lies completely flat</div>
      </div>
      <div class="svg-container">
        <svg viewBox="10 90 240 120" fill="none" xmlns="http://www.w3.org/2000/svg">
          
          <polygon points="15,112 245,112 215,202 45,202" fill="#f1f5f9"/>
          <line x1="15" y1="112" x2="245" y2="112" stroke="#cbd5e1" stroke-width="1.5" stroke-dasharray="4 3"/>
          <line x1="45" y1="202" x2="215" y2="202" stroke="#cbd5e1" stroke-width="1.5"/>

          
          <polygon points="32,132 112,126 102,188 22,182" fill="#ffffff" stroke="#94a3b8" stroke-width="1.5"/>
          
          <ellipse cx="66" cy="155" rx="25" ry="13" fill="#38bdf8" stroke="#0284c7" stroke-width="2"/>

          
          <polygon points="148,135 218,130 193,184 128,179" fill="#fef08a" stroke="#ca8a04" stroke-width="2"/>

          
          <line x1="66" y1="172" x2="66" y2="182" stroke="#94a3b8" stroke-width="1" stroke-dasharray="2 2"/>
          <line x1="160" y1="184" x2="160" y2="194" stroke="#94a3b8" stroke-width="1" stroke-dasharray="2 2"/>
        </svg>
      </div>
      <div class="labels">
        <span>Paper Circle</span>
        <span>Paper Square</span>
      </div>
    </div>

    
    <div class="column">
      <div class="header-area">
        <div class="column-title solid-title">Solid (3D)</div>
        <div class="sub-badge solid-badge">✦ Takes up space!</div>
      </div>
      <div class="svg-container">
        <svg viewBox="10 90 240 120" fill="none" xmlns="http://www.w3.org/2000/svg">
          <defs>
            <radialGradient id="sphereGrad" cx="35%" cy="35%" r="65%">
              <stop offset="0%" stop-color="#ffffff"/>
              <stop offset="35%" stop-color="#f8fafc"/>
              <stop offset="70%" stop-color="#94a3b8"/>
              <stop offset="100%" stop-color="#334155"/>
            </radialGradient>
            <radialGradient id="ballShadow" cx="50%" cy="50%" r="50%">
              <stop offset="0%" stop-color="rgba(30, 41, 59, 0.4)"/>
              <stop offset="100%" stop-color="rgba(30, 41, 59, 0)"/>
            </radialGradient>
          </defs>

          
          <polygon points="15,112 245,112 215,202 45,202" fill="#f1f5f9"/>
          <line x1="15" y1="112" x2="245" y2="112" stroke="#cbd5e1" stroke-width="1.5" stroke-dasharray="4 3"/>
          <line x1="45" y1="202" x2="215" y2="202" stroke="#cbd5e1" stroke-width="1.5"/>

          
          
          <ellipse cx="68" cy="180" rx="30" ry="10" fill="url(#ballShadow)"/>
          
          
          <g>
            <circle cx="68" cy="144" r="28" fill="url(#sphereGrad)"/>
            
            <polygon points="65,133 74,137 71,148 61,148 59,137" fill="#1e293b"/>
            <polygon points="74,137 83,131 88,138 82,146 71,148" fill="#475569" opacity="0.65"/>
            <polygon points="65,133 66,122 56,120 53,129 59,137" fill="#475569" opacity="0.65"/>
            <polygon points="61,148 55,157 46,151 48,141 53,140" fill="#475569" opacity="0.65"/>
            <polygon points="71,148 76,158 71,166 62,165 55,157" fill="#475569" opacity="0.65"/>
            
            <ellipse cx="57" cy="132" rx="7" ry="4" fill="#ffffff" opacity="0.75" transform="rotate(-25 57 132)"/>
          </g>

          
          
          <polygon points="140,183 194,180 220,170 176,170" fill="url(#ballShadow)"/>
          
          
          <polygon points="168,110 206,120 177,135 139,125" fill="#f87171" stroke="#dc2626" stroke-width="1"/>
          
          <polygon points="139,125 177,135 177,174 139,164" fill="#ef4444" stroke="#dc2626" stroke-width="1"/>
          
          <polygon points="177,135 206,120 206,159 177,174" fill="#b91c1c" stroke="#991b1b" stroke-width="1"/>
          
          <polygon points="158,144 161,150 167,150 162,154 164,160 158,156 152,160 154,154 149,150 155,150" fill="#fef08a"/>

          
          <g class="sparkle">
            <path d="M 28 122 Q 32 122 32 118 Q 32 122 36 122 Q 32 122 32 126 Q 32 122 28 122" fill="#e11d48"/>
          </g>
          <g class="sparkle sparkle-2">
            <path d="M 104 104 Q 108 104 108 100 Q 108 104 112 104 Q 108 104 108 108 Q 108 104 104 104" fill="#f59e0b"/>
          </g>
          <g class="sparkle sparkle-3">
            <path d="M 220 106 Q 224 106 224 102 Q 224 106 228 106 Q 224 106 224 110 Q 224 106 220 106" fill="#e11d48"/>
          </g>
        </svg>
      </div>
      <div class="labels">
        <span>Soccer Ball</span>
        <span>Toy Block</span>
      </div>
    </div>
  </div>

</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">
  <title>2D Shapes: Sides and Corners</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .toolbar {
      display: flex;
      gap: 8px;
      margin-bottom: 12px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn {
      font-size: 14px;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 20px;
      border: 1px solid #cbd5e1;
      background: #ffffff;
      color: #475569;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background-color 0.2s, border-color 0.2s, color 0.2s;
    }

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

    .btn.corner-btn.active {
      background: #9333ea;
      border-color: #9333ea;
      color: #ffffff;
    }

    .shapes-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      width: 100%;
      max-width: 660px;
    }

    @media (max-width: 480px) {
      .shapes-grid {
        grid-template-columns: 1fr;
        gap: 12px;
      }
    }

    .shape-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    }

    .shape-header {
      text-align: center;
      margin-bottom: 4px;
    }

    .shape-name {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
    }

    .shape-counts {
      display: flex;
      gap: 6px;
      justify-content: center;
      font-size: 13px;
      font-weight: 600;
      margin-top: 2px;
    }

    .badge-side-count {
      color: #0284c7;
      background: #e0f2fe;
      padding: 2px 6px;
      border-radius: 6px;
    }

    .badge-corner-count {
      color: #9333ea;
      background: #f3e8ff;
      padding: 2px 6px;
      border-radius: 6px;
    }

    .svg-container {
      width: 100%;
      max-width: 160px;
      aspect-ratio: 1 / 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    /* Shape outlines */
    .shape-path {
      fill: #f8fafc;
      stroke: #334155;
      stroke-width: 3;
      stroke-linejoin: round;
      transition: stroke 0.3s, fill 0.3s;
    }

    .highlight-sides .shape-path {
      stroke: #0284c7;
      stroke-width: 4;
      fill: #f0f9ff;
    }

    /* Badges */
    .badge-side {
      transition: opacity 0.3s, filter 0.3s;
    }

    .badge-corner {
      transition: opacity 0.3s, filter 0.3s;
    }

    .dimmed {
      opacity: 0.2;
    }

    .pulsing circle {
      filter: drop-shadow(0 0 3px rgba(0,0,0,0.25));
    }

    .side-circle {
      fill: #0284c7;
    }

    .corner-circle {
      fill: #9333ea;
    }

    .badge-text {
      fill: #ffffff;
      font-size: 11px;
      font-weight: 700;
      text-anchor: middle;
      dominant-baseline: central;
      font-family: inherit;
    }
  </style>
</head>
<body>

  <div class="toolbar" role="toolbar" aria-label="Highlight Mode">
    <button class="btn active" id="btn-all" onclick="setMode('all')">Show All</button>
    <button class="btn" id="btn-sides" onclick="setMode('sides')">Sides (Blue)</button>
    <button class="btn corner-btn" id="btn-corners" onclick="setMode('corners')">Corners (Purple)</button>
  </div>

  <div class="shapes-grid" id="grid">
    
    <div class="shape-card">
      <div class="shape-header">
        <div class="shape-name">Triangle</div>
        <div class="shape-counts">
          <span class="badge-side-count">3 sides</span>
          <span class="badge-corner-count">3 corners</span>
        </div>
      </div>
      <div class="svg-container">
        <svg viewBox="0 0 160 160" aria-label="Triangle with 3 sides and 3 corners">
          
          <polygon class="shape-path" points="80,24 22,136 138,136" />
          
          
          <g class="badge-side" id="tri-side-1">
            <circle class="side-circle" cx="40" cy="80" r="10" />
            <text class="badge-text" x="40" y="80">1</text>
          </g>
          <g class="badge-side" id="tri-side-2">
            <circle class="side-circle" cx="80" cy="148" r="10" />
            <text class="badge-text" x="80" y="148">2</text>
          </g>
          <g class="badge-side" id="tri-side-3">
            <circle class="side-circle" cx="120" cy="80" r="10" />
            <text class="badge-text" x="120" y="80">3</text>
          </g>

          
          <g class="badge-corner" id="tri-corn-1">
            <circle class="corner-circle" cx="80" cy="24" r="10" />
            <text class="badge-text" x="80" y="24">1</text>
          </g>
          <g class="badge-corner" id="tri-corn-2">
            <circle class="corner-circle" cx="22" cy="136" r="10" />
            <text class="badge-text" x="22" y="136">2</text>
          </g>
          <g class="badge-corner" id="tri-corn-3">
            <circle class="corner-circle" cx="138" cy="136" r="10" />
            <text class="badge-text" x="138" y="136">3</text>
          </g>
        </svg>
      </div>
    </div>

    
    <div class="shape-card">
      <div class="shape-header">
        <div class="shape-name">Square</div>
        <div class="shape-counts">
          <span class="badge-side-count">4 sides</span>
          <span class="badge-corner-count">4 corners</span>
        </div>
      </div>
      <div class="svg-container">
        <svg viewBox="0 0 160 160" aria-label="Square with 4 sides and 4 corners">
          
          <rect class="shape-path" x="32" y="32" width="96" height="96" />

          
          <g class="badge-side" id="sq-side-1">
            <circle class="side-circle" cx="80" cy="20" r="10" />
            <text class="badge-text" x="80" y="20">1</text>
          </g>
          <g class="badge-side" id="sq-side-2">
            <circle class="side-circle" cx="140" cy="80" r="10" />
            <text class="badge-text" x="140" y="80">2</text>
          </g>
          <g class="badge-side" id="sq-side-3">
            <circle class="side-circle" cx="80" cy="140" r="10" />
            <text class="badge-text" x="80" y="140">3</text>
          </g>
          <g class="badge-side" id="sq-side-4">
            <circle class="side-circle" cx="20" cy="80" r="10" />
            <text class="badge-text" x="20" y="80">4</text>
          </g>

          
          <g class="badge-corner" id="sq-corn-1">
            <circle class="corner-circle" cx="32" cy="32" r="10" />
            <text class="badge-text" x="32" y="32">1</text>
          </g>
          <g class="badge-corner" id="sq-corn-2">
            <circle class="corner-circle" cx="128" cy="32" r="10" />
            <text class="badge-text" x="128" y="32">2</text>
          </g>
          <g class="badge-corner" id="sq-corn-3">
            <circle class="corner-circle" cx="128" cy="128" r="10" />
            <text class="badge-text" x="128" y="128">3</text>
          </g>
          <g class="badge-corner" id="sq-corn-4">
            <circle class="corner-circle" cx="32" cy="128" r="10" />
            <text class="badge-text" x="32" y="128">4</text>
          </g>
        </svg>
      </div>
    </div>

    
    <div class="shape-card">
      <div class="shape-header">
        <div class="shape-name">Rectangle</div>
        <div class="shape-counts">
          <span class="badge-side-count">4 sides</span>
          <span class="badge-corner-count">4 corners</span>
        </div>
      </div>
      <div class="svg-container">
        <svg viewBox="0 0 160 160" aria-label="Rectangle with 4 sides and 4 corners">
          
          <rect class="shape-path" x="18" y="48" width="124" height="64" />

          
          <g class="badge-side" id="rec-side-1">
            <circle class="side-circle" cx="80" cy="36" r="10" />
            <text class="badge-text" x="80" y="36">1</text>
          </g>
          <g class="badge-side" id="rec-side-2">
            <circle class="side-circle" cx="150" cy="80" r="10" />
            <text class="badge-text" x="150" y="80">2</text>
          </g>
          <g class="badge-side" id="rec-side-3">
            <circle class="side-circle" cx="80" cy="124" r="10" />
            <text class="badge-text" x="80" y="124">3</text>
          </g>
          <g class="badge-side" id="rec-side-4">
            <circle class="side-circle" cx="10" cy="80" r="10" />
            <text class="badge-text" x="10" y="80">4</text>
          </g>

          
          <g class="badge-corner" id="rec-corn-1">
            <circle class="corner-circle" cx="18" cy="48" r="10" />
            <text class="badge-text" x="18" y="48">1</text>
          </g>
          <g class="badge-corner" id="rec-corn-2">
            <circle class="corner-circle" cx="142" cy="48" r="10" />
            <text class="badge-text" x="142" y="48">2</text>
          </g>
          <g class="badge-corner" id="rec-corn-3">
            <circle class="corner-circle" cx="142" cy="112" r="10" />
            <text class="badge-text" x="142" y="112">3</text>
          </g>
          <g class="badge-corner" id="rec-corn-4">
            <circle class="corner-circle" cx="18" cy="112" r="10" />
            <text class="badge-text" x="18" y="112">4</text>
          </g>
        </svg>
      </div>
    </div>
  </div>

  <script>
    function setMode(mode) {
      const btnAll = document.getElementById('btn-all');
      const btnSides = document.getElementById('btn-sides');
      const btnCorners = document.getElementById('btn-corners');
      const grid = document.getElementById('grid');

      btnAll.classList.remove('active');
      btnSides.classList.remove('active');
      btnCorners.classList.remove('active');

      const sideBadges = document.querySelectorAll('.badge-side');
      const cornerBadges = document.querySelectorAll('.badge-corner');

      if (mode === 'all') {
        btnAll.classList.add('active');
        grid.classList.remove('highlight-sides');
        sideBadges.forEach(el => el.classList.remove('dimmed', 'pulsing'));
        cornerBadges.forEach(el => el.classList.remove('dimmed', 'pulsing'));
      } else if (mode === 'sides') {
        btnSides.classList.add('active');
        grid.classList.add('highlight-sides');
        sideBadges.forEach(el => {
          el.classList.remove('dimmed');
          el.classList.add('pulsing');
        });
        cornerBadges.forEach(el => {
          el.classList.add('dimmed');
          el.classList.remove('pulsing');
        });
      } else if (mode === 'corners') {
        btnCorners.classList.add('active');
        grid.classList.remove('highlight-sides');
        sideBadges.forEach(el => {
          el.classList.add('dimmed');
          el.classList.remove('pulsing');
        });
        cornerBadges.forEach(el => {
          el.classList.remove('dimmed');
          el.classList.add('pulsing');
        });
      }
    }
  </script>
</body>
</html>

Describing 2D Shapes: Sides and Corners

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 10px;
    }

    .toolbar {
      display: flex;
      justify-content: center;
      gap: 8px;
      margin-bottom: 12px;
      flex-wrap: wrap;
    }

    .btn-tab {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      box-shadow: none;
      transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    }

    .btn-tab.active {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
      box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3);
    }

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

    @media (max-width: 440px) {
      .grid {
        grid-template-columns: 1fr;
        gap: 16px;
      }
    }

    .shape-card {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 16px;
      padding: 12px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .shape-card.circle-card {
      border-color: #fecdd3;
    }

    .shape-card.pentagon-card {
      border-color: #fed7aa;
    }

    .badge {
      display: inline-block;
      font-size: 14px;
      font-weight: 700;
      padding: 6px 12px;
      border-radius: 10px;
      margin-top: 8px;
    }

    .badge-circle {
      background: #ffe4e6;
      color: #e11d48;
    }

    .badge-pentagon {
      background: #ffedd5;
      color: #ea580c;
    }

    .sub-tag {
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
      margin-top: 4px;
    }

    svg {
      width: 100%;
      max-width: 220px;
      height: auto;
      overflow: visible;
    }

    .side-line {
      stroke: #ea580c;
      stroke-width: 8;
      stroke-linecap: round;
      transition: stroke-width 0.25s, stroke 0.25s;
    }

    .side-label-bg {
      fill: #ea580c;
      transition: transform 0.25s;
    }

    .side-label-txt {
      fill: #ffffff;
      font-weight: 800;
      font-size: 12px;
      text-anchor: middle;
      dominant-baseline: central;
    }

    .corner-star {
      cursor: pointer;
      transition: transform 0.25s;
      transform-origin: center;
    }

    .highlight-sides .side-line {
      stroke: #c2410c;
      stroke-width: 10;
    }

    .highlight-corners .corner-star {
      filter: drop-shadow(0 0 4px #eab308);
    }
  </style>
</head>
<body>

  <div class="toolbar">
    <button class="btn-tab active" id="btnAll" onclick="setMode('all')">✨ Both Shapes</button>
    <button class="btn-tab" id="btnSides" onclick="setMode('sides')">📏 Count 5 Sides</button>
    <button class="btn-tab" id="btnCorners" onclick="setMode('corners')">⭐ Count 5 Corners</button>
  </div>

  <div class="grid" id="mainGrid">
    
    <div class="shape-card circle-card">
      <svg viewBox="0 0 220 190" aria-label="Circle diagram">
        
        <circle cx="100" cy="95" r="62" fill="#ffe4e6" stroke="#e11d48" stroke-width="7" />

        
        <g transform="translate(142, 40)">
          
          <line x1="28" y1="28" x2="52" y2="52" stroke="#475569" stroke-width="7" stroke-linecap="round" />
          
          <circle cx="16" cy="16" r="28" fill="#ffffff" stroke="#334155" stroke-width="4" />
          
          <path d="M -4,28 A 30 30 0 0 0 32,-4" fill="none" stroke="#e11d48" stroke-width="8" stroke-linecap="round" />
          <text x="16" y="-12" text-anchor="middle" font-size="10" font-weight="700" fill="#e11d48">Curved</text>
        </g>
      </svg>
      <div class="badge badge-circle">Circle: 0 Sides · 0 Corners</div>
      <div class="sub-tag">Curved edge = No straight sides</div>
    </div>

    
    <div class="shape-card pentagon-card">
      <svg viewBox="0 0 220 190" id="pentagonSvg" aria-label="Pentagon diagram">
        
        <polygon points="110,28 182,80 154,162 66,162 38,80" fill="#fff7ed" />

        
        <line id="s1" class="side-line" x1="110" y1="28" x2="182" y2="80" />
        <line id="s2" class="side-line" x1="182" y1="80" x2="154" y2="162" />
        <line id="s3" class="side-line" x1="154" y1="162" x2="66" y2="162" />
        <line id="s4" class="side-line" x1="66" y1="162" x2="38" y2="80" />
        <line id="s5" class="side-line" x1="38" y1="80" x2="110" y2="28" />

        
        <g id="sideBadges">
          <circle class="side-label-bg" cx="156" cy="48" r="10" />
          <text class="side-label-txt" x="156" y="48">1</text>

          <circle class="side-label-bg" cx="178" cy="122" r="10" />
          <text class="side-label-txt" x="178" y="122">2</text>

          <circle class="side-label-bg" cx="110" cy="174" r="10" />
          <text class="side-label-txt" x="110" y="174">3</text>

          <circle class="side-label-bg" cx="42" cy="122" r="10" />
          <text class="side-label-txt" x="42" y="122">4</text>

          <circle class="side-label-bg" cx="64" cy="48" r="10" />
          <text class="side-label-txt" x="64" y="48">5</text>
        </g>

        
        <g id="cornerStars">
          
          <g class="corner-star" transform="translate(110,28)">
            <circle r="12" fill="#fef08a" stroke="#eab308" stroke-width="2" />
            <text font-size="12" text-anchor="middle" dominant-baseline="central">⭐</text>
          </g>
          
          <g class="corner-star" transform="translate(182,80)">
            <circle r="12" fill="#fef08a" stroke="#eab308" stroke-width="2" />
            <text font-size="12" text-anchor="middle" dominant-baseline="central">⭐</text>
          </g>
          
          <g class="corner-star" transform="translate(154,162)">
            <circle r="12" fill="#fef08a" stroke="#eab308" stroke-width="2" />
            <text font-size="12" text-anchor="middle" dominant-baseline="central">⭐</text>
          </g>
          
          <g class="corner-star" transform="translate(66,162)">
            <circle r="12" fill="#fef08a" stroke="#eab308" stroke-width="2" />
            <text font-size="12" text-anchor="middle" dominant-baseline="central">⭐</text>
          </g>
          
          <g class="corner-star" transform="translate(38,80)">
            <circle r="12" fill="#fef08a" stroke="#eab308" stroke-width="2" />
            <text font-size="12" text-anchor="middle" dominant-baseline="central">⭐</text>
          </g>
        </g>
      </svg>
      <div class="badge badge-pentagon">Pentagon: 5 Sides · 5 Corners</div>
      <div class="sub-tag" id="pentagonSubTag">5 straight edges + 5 pointy corners</div>
    </div>
  </div>

  <script>
    function setMode(mode) {
      document.querySelectorAll('.btn-tab').forEach(b => b.classList.remove('active'));
      const svg = document.getElementById('pentagonSvg');
      const subTag = document.getElementById('pentagonSubTag');
      
      svg.classList.remove('highlight-sides', 'highlight-corners');

      if (mode === 'all') {
        document.getElementById('btnAll').classList.add('active');
        subTag.textContent = '5 straight edges + 5 pointy corners';
      } else if (mode === 'sides') {
        document.getElementById('btnSides').classList.add('active');
        svg.classList.add('highlight-sides');
        subTag.textContent = 'Counting 5 straight sides (1, 2, 3, 4, 5)';
      } else if (mode === 'corners') {
        document.getElementById('btnCorners').classList.add('active');
        svg.classList.add('highlight-corners');
        subTag.textContent = 'Counting 5 star corners (⭐ 1, 2, 3, 4, 5)';
      }
    }
  </script>
</body>
</html>

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

    .header-bar {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-bottom: 4px;
    }

    .badge {
      font-size: 16px;
      font-weight: 700;
      padding: 6px 14px;
      border-radius: 20px;
      transition: background-color 0.3s ease, color 0.3s ease;
    }
    .badge-side { background: #e0f2fe; color: #0284c7; }
    .badge-corner { background: #fef3c7; color: #b45309; }

    .svg-wrap {
      width: 100%;
      max-width: 360px;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

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

    .side-line {
      stroke: #0284c7;
      stroke-width: 10;
      stroke-linecap: round;
      opacity: 0;
      transition: opacity 0.4s ease, stroke-width 0.3s ease;
      filter: drop-shadow(0 0 6px rgba(2, 132, 199, 0.6));
    }
    .side-line.active {
      opacity: 1;
      stroke-width: 12;
    }

    .side-label {
      font-size: 15px;
      font-weight: 800;
      fill: #0284c7;
      text-anchor: middle;
      dominant-baseline: central;
      opacity: 0;
      transition: opacity 0.4s ease;
    }
    .side-label.active { opacity: 1; }

    .corner-group {
      opacity: 0;
      transition: opacity 0.4s ease, transform 0.4s ease;
      transform-origin: center;
    }
    .corner-group.active {
      opacity: 1;
      animation: pulse 1.6s infinite ease-in-out;
    }

    @keyframes pulse {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.18); }
    }

    .corner-label {
      font-size: 14px;
      font-weight: 800;
      fill: #b45309;
      text-anchor: middle;
      dominant-baseline: central;
      opacity: 0;
      transition: opacity 0.4s ease;
    }
    .corner-label.active { opacity: 1; }

    .label-bg {
      fill: #ffffff;
      rx: 8;
      stroke-width: 2;
    }
    .label-bg-side { stroke: #0284c7; }
    .label-bg-corner { stroke: #f59e0b; }

    .controls {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
      width: 100%;
      max-width: 360px;
    }

    .mode-tabs {
      display: flex;
      gap: 8px;
      width: 100%;
    }

    .tab-btn {
      flex: 1;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 700;
      border: 2px solid transparent;
      border-radius: 10px;
      background: #f1f5f9;
      color: #64748b;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: all 0.25s ease;
    }

    .tab-btn.active-sides {
      background: #e0f2fe;
      color: #0369a1;
      border-color: #0284c7;
    }

    .tab-btn.active-corners {
      background: #fef3c7;
      color: #92400e;
      border-color: #f59e0b;
    }

    .stepper-nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .nav-btn {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      padding: 6px 12px;
      font-size: 14px;
      font-weight: 700;
      color: #334155;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      min-width: 74px;
      justify-content: center;
    }
    .nav-btn:active { background: #e2e8f0; }

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

    .dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: #e2e8f0;
      cursor: pointer;
      transition: all 0.25s ease;
    }
    .dot.active {
      background: #0284c7;
      transform: scale(1.2);
    }
    .dot.active.corner-dot {
      background: #f59e0b;
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <div id="badgeTitle" class="badge badge-side">Side 1 of 3</div>
  </div>

  <div class="svg-wrap">
    <svg viewBox="0 0 380 340">
      <defs>
        
        <g id="goldStar">
          <circle cx="0" cy="0" r="16" fill="#fef08a" stroke="#f59e0b" stroke-width="2.5" />
          <path d="M 0,-11 L 3,-3 L 11,-3 L 5,2 L 7,10 L 0,5 L -7,10 L -5,2 L -11,-3 L -3,-3 Z" fill="#f59e0b" />
        </g>
      </defs>

      
      
      <polygon points="190,46 325,276 55,276"
               fill="#4ade80"
               stroke="#16a34a"
               stroke-width="5"
               stroke-linejoin="round" />

      
      <circle cx="155" cy="180" r="7" fill="#14532d" />
      <circle cx="225" cy="180" r="7" fill="#14532d" />
      <path d="M 172 205 Q 190 220 208 205" fill="none" stroke="#14532d" stroke-width="4" stroke-linecap="round" />

      
      <line id="side1" class="side-line" x1="55" y1="276" x2="190" y2="46" />
      <g id="sideLabel1" class="side-label">
        <rect class="label-bg label-bg-side" x="40" y="135" width="76" height="32" />
        <text x="78" y="152">Side 1</text>
      </g>

      
      <line id="side2" class="side-line" x1="190" y1="46" x2="325" y2="276" />
      <g id="sideLabel2" class="side-label">
        <rect class="label-bg label-bg-side" x="264" y="135" width="76" height="32" />
        <text x="302" y="152">Side 2</text>
      </g>

      
      <line id="side3" class="side-line" x1="325" y1="276" x2="55" y2="276" />
      <g id="sideLabel3" class="side-label">
        <rect class="label-bg label-bg-side" x="152" y="288" width="76" height="32" />
        <text x="190" y="305">Side 3</text>
      </g>

      
      <g id="corner1" class="corner-group" style="transform-origin: 190px 46px;">
        <use href="#goldStar" x="190" y="46" />
      </g>
      <g id="cornerLabel1" class="corner-label">
        <rect class="label-bg label-bg-corner" x="110" y="2" width="160" height="30" />
        <text x="190" y="18">Corner 1 (Vertex)</text>
      </g>

      
      <g id="corner2" class="corner-group" style="transform-origin: 325px 276px;">
        <use href="#goldStar" x="325" y="276" />
      </g>
      <g id="cornerLabel2" class="corner-label">
        <rect class="label-bg label-bg-corner" x="210" y="292" width="160" height="30" />
        <text x="290" y="308">Corner 2 (Vertex)</text>
      </g>

      
      <g id="corner3" class="corner-group" style="transform-origin: 55px 276px;">
        <use href="#goldStar" x="55" y="276" />
      </g>
      <g id="cornerLabel3" class="corner-label">
        <rect class="label-bg label-bg-corner" x="10" y="292" width="160" height="30" />
        <text x="90" y="308">Corner 3 (Vertex)</text>
      </g>
    </svg>
  </div>

  <div class="controls">
    <div class="mode-tabs">
      <button id="sidesTab" class="tab-btn active-sides">📏 3 Sides</button>
      <button id="cornersTab" class="tab-btn">✦ 3 Corners</button>
    </div>

    <div class="stepper-nav">
      <button id="prevBtn" class="nav-btn">◀ Back</button>
      <div class="dots" id="dotsContainer">
        <div class="dot active"></div>
        <div class="dot"></div>
        <div class="dot"></div>
        <div class="dot"></div>
        <div class="dot"></div>
        <div class="dot"></div>
      </div>
      <button id="nextBtn" class="nav-btn">Next ▶</button>
    </div>
  </div>

  <script src="{{VENDOR_CDN}}/classace-diagram.js"></script>
  <script>
    const steps = [
      { type: 'side', index: 1, title: 'Side 1 of 3 (Straight Edge)' },
      { type: 'side', index: 2, title: 'Side 2 of 3 (Straight Edge)' },
      { type: 'side', index: 3, title: 'Side 3 of 3 (Straight Edge)' },
      { type: 'corner', index: 1, title: 'Corner 1 of 3 (Sharp Vertex)' },
      { type: 'corner', index: 2, title: 'Corner 2 of 3 (Sharp Vertex)' },
      { type: 'corner', index: 3, title: 'Corner 3 of 3 (Sharp Vertex)' }
    ];

    let currentStep = 0;
    let autoTimer = null;

    const badgeTitle = document.getElementById('badgeTitle');
    const sidesTab = document.getElementById('sidesTab');
    const cornersTab = document.getElementById('cornersTab');
    const dots = Array.from(document.querySelectorAll('.dot'));
    const prevBtn = document.getElementById('prevBtn');
    const nextBtn = document.getElementById('nextBtn');

    function renderStep(idx) {
      currentStep = (idx + steps.length) % steps.length;
      const step = steps[currentStep];

      // Update badge
      badgeTitle.textContent = step.title;
      if (step.type === 'side') {
        badgeTitle.className = 'badge badge-side';
        sidesTab.className = 'tab-btn active-sides';
        cornersTab.className = 'tab-btn';
      } else {
        badgeTitle.className = 'badge badge-corner';
        sidesTab.className = 'tab-btn';
        cornersTab.className = 'tab-btn active-corners';
      }

      // Reset all visuals
      for (let i = 1; i <= 3; i++) {
        document.getElementById(`side${i}`).classList.remove('active');
        document.getElementById(`sideLabel${i}`).classList.remove('active');
        document.getElementById(`corner${i}`).classList.remove('active');
        document.getElementById(`cornerLabel${i}`).classList.remove('active');
      }

      // Activate active step elements
      if (step.type === 'side') {
        // Show up to current side to build up triangle
        for (let i = 1; i <= step.index; i++) {
          document.getElementById(`side${i}`).classList.add('active');
        }
        document.getElementById(`sideLabel${step.index}`).classList.add('active');
      } else {
        // In corners mode, keep sides softly visible without glow labels
        for (let i = 1; i <= 3; i++) {
          document.getElementById(`side${i}`).classList.add('active');
        }
        for (let i = 1; i <= step.index; i++) {
          document.getElementById(`corner${i}`).classList.add('active');
        }
        document.getElementById(`cornerLabel${step.index}`).classList.add('active');
      }

      // Update dots
      dots.forEach((d, i) => {
        d.className = 'dot' + (i === currentStep ? ' active' + (step.type === 'corner' ? ' corner-dot' : '') : '');
      });
    }

    function startCycle() {
      stopCycle();
      autoTimer = setInterval(() => {
        renderStep(currentStep + 1);
      }, 3200);
    }

    function stopCycle() {
      if (autoTimer) clearInterval(autoTimer);
    }

    // Interactive tabs
    sidesTab.addEventListener('click', () => {
      stopCycle();
      renderStep(0);
    });

    cornersTab.addEventListener('click', () => {
      stopCycle();
      renderStep(3);
    });

    // Step navigation
    prevBtn.addEventListener('click', () => {
      stopCycle();
      renderStep(currentStep - 1);
    });

    nextBtn.addEventListener('click', () => {
      stopCycle();
      renderStep(currentStep + 1);
    });

    dots.forEach((dot, index) => {
      dot.addEventListener('click', () => {
        stopCycle();
        renderStep(index);
      });
    });

    // Initialize
    renderStep(0);
    startCycle();
  </script>
</body>
</html>

OGM.1.G.3

Aligned learning resources

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