<!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;
      -webkit-tap-highlight-color: transparent;
      user-select: none;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: transparent;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 12px 8px;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
      width: 100%;
      max-width: 600px;
    }

    .armor-card {
      background: #f8fafc;
      border: 2px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      transition: border-color 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
      min-height: 220px;
      text-align: center;
    }

    .armor-card.active {
      border-color: #22b7ff;
      background: #f0f9ff;
      box-shadow: 0 0 0 2px rgba(34, 183, 255, 0.25);
    }

    .bone-title {
      font-size: 14px;
      font-weight: 700;
      color: #475569;
      transition: color 0.3s ease;
    }

    .armor-card.active .bone-title {
      color: #0284c7;
    }

    .stage {
      position: relative;
      width: 100%;
      height: 120px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* SVG bone structures */
    .bone-svg {
      width: 100%;
      height: 100%;
      position: absolute;
      inset: 0;
      pointer-events: none;
      z-index: 2;
    }

    .bone-stroke {
      stroke: #94a3b8;
      stroke-width: 4;
      stroke-linecap: round;
      stroke-linejoin: round;
      fill: none;
      transition: stroke 0.3s ease, filter 0.3s ease;
    }

    .bone-fill {
      fill: #e2e8f0;
      transition: fill 0.3s ease;
    }

    .armor-card.active .bone-stroke {
      stroke: #22b7ff;
      filter: drop-shadow(0 0 3px rgba(34, 183, 255, 0.4));
    }

    .armor-card.active .bone-fill {
      fill: rgba(34, 183, 255, 0.12);
    }

    /* Organ inside */
    .organ {
      font-size: 34px;
      z-index: 1;
      transition: transform 0.3s ease, opacity 0.3s ease;
      opacity: 0.85;
    }

    .armor-card.active .organ {
      transform: scale(1.08);
      opacity: 1;
    }

    .analogy-badge {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 2px 6px;
      border-radius: 999px;
      margin-bottom: 4px;
      transition: all 0.3s ease;
    }

    .armor-card.active .analogy-badge {
      background: #e0f2fe;
      border-color: #bae6fd;
      color: #0369a1;
    }

    .organ-label {
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      transition: color 0.3s ease;
    }

    .armor-card.active .organ-label {
      color: #0f172a;
    }

    /* Spinal cord special line inside spine */
    .nerve-cord {
      width: 4px;
      height: 80px;
      background: #cbd5e1;
      border-radius: 2px;
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .armor-card.active .nerve-cord {
      background: #fbbf24;
      box-shadow: 0 0 8px rgba(251, 191, 36, 0.6);
    }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="armor-card active" onclick="activate(this)">
      <div>
        <div class="bone-title">Skull</div>
        <div class="analogy-badge">⛑️ Helmet</div>
      </div>
      <div class="stage">
        <svg class="bone-svg" viewBox="0 0 100 100">
          
          <path class="bone-fill" d="M 22 62 C 16 35 32 16 50 16 C 68 16 84 35 78 62 C 70 70 30 70 22 62 Z" />
          <path class="bone-stroke" d="M 22 62 C 16 35 32 16 50 16 C 68 16 84 35 78 62 C 72 70 28 70 22 62 Z" />
          
          <path class="bone-stroke" d="M 32 64 Q 50 68 68 64" />
        </svg>
        <div class="organ">🧠</div>
      </div>
      <div class="organ-label">Brain</div>
    </div>

    
    <div class="armor-card" onclick="activate(this)">
      <div>
        <div class="bone-title">Ribcage</div>
        <div class="analogy-badge">🛡️ Cage</div>
      </div>
      <div class="stage">
        <svg class="bone-svg" viewBox="0 0 100 100">
          
          <line class="bone-stroke" x1="50" y1="20" x2="50" y2="78" stroke-width="5" />
          
          <path class="bone-stroke" d="M 50 26 C 24 24 16 40 48 45" />
          <path class="bone-stroke" d="M 50 26 C 76 24 84 40 52 45" />
          <path class="bone-stroke" d="M 50 42 C 20 40 14 58 48 62" />
          <path class="bone-stroke" d="M 50 42 C 80 40 86 58 52 62" />
          <path class="bone-stroke" d="M 50 58 C 22 58 18 74 48 76" />
          <path class="bone-stroke" d="M 50 58 C 78 58 82 74 52 76" />
        </svg>
        <div class="organ" style="font-size: 26px; display: flex; gap: 2px;">
          <span>🫁</span><span>🫀</span>
        </div>
      </div>
      <div class="organ-label">Heart & Lungs</div>
    </div>

    
    <div class="armor-card" onclick="activate(this)">
      <div>
        <div class="bone-title">Spine</div>
        <div class="analogy-badge">⚡ Conduit</div>
      </div>
      <div class="stage">
        <svg class="bone-svg" viewBox="0 0 100 100">
          
          <rect class="bone-fill bone-stroke" x="32" y="16" width="36" height="12" rx="3" />
          <rect class="bone-fill bone-stroke" x="30" y="32" width="40" height="12" rx="3" />
          <rect class="bone-fill bone-stroke" x="30" y="48" width="40" height="12" rx="3" />
          <rect class="bone-fill bone-stroke" x="28" y="64" width="44" height="12" rx="3" />
          
          <line class="bone-stroke" x1="42" y1="16" x2="42" y2="76" stroke-dasharray="2 3" />
          <line class="bone-stroke" x1="58" y1="16" x2="58" y2="76" stroke-dasharray="2 3" />
        </svg>
        <div class="nerve-cord"></div>
      </div>
      <div class="organ-label">Spinal Cord</div>
    </div>
  </div>

  <script>
    function activate(el) {
      document.querySelectorAll('.armor-card').forEach(card => card.classList.remove('active'));
      el.classList.add('active');
    }
  </script>
</body>
</html>

The Three Main Functions of the Skeleton

<!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;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
      user-select: none;
    }

    .header-bar {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      width: 100%;
    }

    .state-badge {
      font-size: 14px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      background: #e2e8f0;
      color: #475569;
      transition: all 0.3s ease;
    }

    .state-badge.contracted {
      background: #fee2e2;
      color: #dc2626;
    }

    .svg-container {
      width: 100%;
      max-width: 480px;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    .bone {
      fill: #f1f5f9;
      stroke: #64748b;
      stroke-width: 2.5;
      stroke-linejoin: round;
    }

    .joint {
      fill: #94a3b8;
      stroke: #475569;
      stroke-width: 2;
    }

    .tendon {
      stroke: #cbd5e1;
      stroke-width: 5;
      stroke-linecap: round;
      fill: none;
    }

    .muscle-belly {
      fill: #ef4444;
      stroke: #b91c1c;
      stroke-width: 2;
      transition: d 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .force-arrow {
      stroke: #dc2626;
      stroke-width: 3.5;
      stroke-linecap: round;
      stroke-dasharray: 6 4;
      fill: none;
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .force-arrow.visible {
      opacity: 1;
    }

    .label-text {
      font-size: 13px;
      font-weight: 600;
      fill: #334155;
    }

    .label-sub {
      font-size: 11px;
      font-weight: 500;
      fill: #64748b;
    }

    .pointer-line {
      stroke: #94a3b8;
      stroke-width: 1.5;
      stroke-dasharray: 2 2;
    }

    .controls {
      display: flex;
      gap: 12px;
      width: 100%;
      max-width: 360px;
      justify-content: center;
      padding-top: 4px;
    }

    .btn {
      flex: 1;
      padding: 10px 14px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      border: 1px solid #cbd5e1;
      background: #ffffff;
      color: #1e2945;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
    }

    .btn.active {
      background: #22b7ff;
      border-color: #0284c7;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(34, 183, 255, 0.35);
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <div id="stateBadge" class="state-badge">Muscle Relaxed</div>
  </div>

  <div class="svg-container">
    <svg viewBox="0 0 460 340">
      <defs>
        <marker id="arrow" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
          <path d="M 0 1.5 L 8 5 L 0 8.5 z" fill="#dc2626"/>
        </marker>
      </defs>

      
      
      <path class="bone" d="M 115 45 C 115 35, 165 35, 165 45 L 155 190 C 160 205, 120 205, 125 190 Z" />

      
      <g id="forearmGroup" style="transform-origin: 140px 200px; transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1); transform: rotate(0deg);">
        
        <path class="bone" d="M 132 195 L 126 315 C 126 325, 154 325, 154 315 L 148 195 Z" />
        <line x1="140" y1="215" x2="140" y2="305" stroke="#cbd5e1" stroke-width="2" />
        
        
        <circle cx="132" cy="225" r="4" fill="#cbd5e1" stroke="#94a3b8" stroke-width="1.5" />
      </g>

      
      <circle class="joint" cx="140" cy="200" r="9" />
      <circle cx="140" cy="200" r="3" fill="#ffffff" />

      
      <line class="tendon" x1="126" y1="58" x2="120" y2="85" />

      
      <path id="musclePath" class="muscle-belly" d="M 120 85 Q 98 145 132 225 Q 112 145 120 85 Z" />

      
      <line id="forceArrow" class="force-arrow" x1="140" y1="205" x2="124" y2="105" marker-end="url(#arrow)" />

      
      
      <path class="pointer-line" d="M 108 140 L 40 140" />
      <text x="35" y="136" class="label-text" text-anchor="end">Biceps</text>
      <text id="muscleSub" x="35" y="152" class="label-sub" text-anchor="end">Relaxed</text>

      
      <path class="pointer-line" d="M 160 110 L 230 110" />
      <text x="236" y="114" class="label-text">Humerus</text>

      
      <path class="pointer-line" d="M 152 200 L 230 200" />
      <text x="236" y="204" class="label-text">Elbow Joint</text>
      <text x="236" y="218" class="label-sub">Hinge lever</text>

      
      <path class="pointer-line" d="M 154 280 L 230 280" />
      <text x="236" y="284" class="label-text">Radius &amp; Ulna</text>

      
      <g id="forceLabelGroup" style="opacity: 0; transition: opacity 0.3s ease;">
        <text x="35" y="80" class="label-text" fill="#dc2626" text-anchor="end">Pulling Force</text>
        <path class="pointer-line" stroke="#dc2626" d="M 40 85 L 115 110" />
      </g>
    </svg>
  </div>

  <div class="controls">
    <button id="btnRelax" class="btn active">Straighten Arm</button>
    <button id="btnContract" class="btn">Bend Arm</button>
  </div>

  <script>
    const forearm = document.getElementById('forearmGroup');
    const muscle = document.getElementById('musclePath');
    const forceArrow = document.getElementById('forceArrow');
    const forceLabel = document.getElementById('forceLabelGroup');
    const stateBadge = document.getElementById('stateBadge');
    const muscleSub = document.getElementById('muscleSub');
    const btnRelax = document.getElementById('btnRelax');
    const btnContract = document.getElementById('btnContract');

    // Muscle paths: Relaxed (extended) vs Contracted (short + thick bulge)
    const relaxedPath = "M 120 85 Q 98 145 132 225 Q 114 145 120 85 Z";
    const contractedPath = "M 120 85 Q 68 128 165 178 Q 116 160 120 85 Z";

    function setArmState(isBent) {
      if (isBent) {
        forearm.style.transform = "rotate(-82deg)";
        muscle.setAttribute('d', contractedPath);
        forceArrow.classList.add('visible');
        forceLabel.style.opacity = '1';
        stateBadge.textContent = "Muscle Contracting (Pulling)";
        stateBadge.classList.add('contracted');
        muscleSub.textContent = "Contracted (bulged)";
        muscleSub.style.fill = "#dc2626";
        btnContract.classList.add('active');
        btnRelax.classList.remove('active');
      } else {
        forearm.style.transform = "rotate(0deg)";
        muscle.setAttribute('d', relaxedPath);
        forceArrow.classList.remove('visible');
        forceLabel.style.opacity = '0';
        stateBadge.textContent = "Muscle Relaxed";
        stateBadge.classList.remove('contracted');
        muscleSub.textContent = "Relaxed";
        muscleSub.style.fill = "#64748b";
        btnRelax.classList.add('active');
        btnContract.classList.remove('active');
      }
    }

    btnRelax.addEventListener('click', () => setArmState(false));
    btnContract.addEventListener('click', () => setArmState(true));
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #f8f9fa;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      min-height: 380px;
      padding: 16px;
      user-select: none;
      -webkit-user-select: none;
    }

    .toggle-bar {
      display: inline-flex;
      background: #e6eef8;
      padding: 4px;
      border-radius: 30px;
      gap: 4px;
      z-index: 10;
    }

    .toggle-btn {
      border: none;
      background: transparent;
      padding: 8px 16px;
      font-size: 14px;
      font-weight: 600;
      color: #64748b;
      border-radius: 24px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: all 0.25s ease;
    }

    .toggle-btn.active {
      background: #ffffff;
      color: #1e2945;
      box-shadow: 0 2px 8px rgba(34, 183, 255, 0.2);
    }

    .stage {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 280px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .scene-svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    /* Animation transitions */
    .standing-group, .puddle-group, .skeleton-bones {
      transition: opacity 0.35s ease, transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
      transform-origin: bottom center;
    }

    .without-skeleton .standing-group {
      opacity: 0;
      transform: translateY(60px) scale(0.6, 0.2);
      pointer-events: none;
    }

    .without-skeleton .skeleton-bones {
      opacity: 0;
      transform: scale(0.4);
    }

    .puddle-group {
      opacity: 0;
      transform: translateY(20px) scale(0.8, 0.5);
      pointer-events: none;
    }

    .without-skeleton .puddle-group {
      opacity: 1;
      transform: translateY(0) scale(1, 1);
      pointer-events: auto;
    }

    /* Floating Badges */
    .badges-col {
      position: absolute;
      right: 12px;
      top: 50%;
      transform: translateY(-50%);
      display: flex;
      flex-direction: column;
      gap: 12px;
      width: 130px;
    }

    .badge-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 8px 12px;
      display: flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 3px 10px rgba(34, 183, 255, 0.12);
      transition: all 0.35s ease;
    }

    .badge-icon {
      font-size: 18px;
      line-height: 1;
    }

    .badge-text {
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
    }

    .without-skeleton .badge-card {
      opacity: 0.3;
      filter: grayscale(0.9);
      transform: translateX(8px);
      box-shadow: none;
    }

    @media (max-width: 400px) {
      .badges-col {
        right: 4px;
        width: 110px;
        gap: 8px;
      }
      .badge-card {
        padding: 6px 8px;
      }
      .badge-text {
        font-size: 12px;
      }
    }
  </style>
</head>
<body>

  <div class="toggle-bar">
    <button id="btnWith" class="toggle-btn active" onclick="setState(true)">
      <span>🦴</span> With Skeleton
    </button>
    <button id="btnWithout" class="toggle-btn" onclick="setState(false)">
      <span>💧</span> Without Skeleton
    </button>
  </div>

  <div id="stageContainer" class="stage">
    <svg class="scene-svg" viewBox="0 0 360 260">
      <defs>
        
        <filter id="softGlow" x="-20%" y="-20%" width="140%" height="140%">
          <feDropShadow dx="0" dy="3" stdDeviation="3" flood-color="#22b7ff" flood-opacity="0.3"/>
        </filter>
      </defs>

      
      <ellipse cx="140" cy="225" rx="110" ry="12" fill="#e2e8f0" />

      
      <g class="standing-group">
        
        <path d="M 120 70 Q 140 68 160 70 Q 166 120 162 165 L 158 220 L 146 220 L 141 165 L 139 165 L 134 220 L 122 220 L 118 165 Q 114 120 120 70 Z" 
              fill="#22b7ff" opacity="0.35" />
        <rect x="98" y="76" width="14" height="70" rx="7" fill="#22b7ff" opacity="0.35" transform="rotate(12 105 80)"/>
        <rect x="168" y="76" width="14" height="70" rx="7" fill="#22b7ff" opacity="0.35" transform="rotate(-12 175 80)"/>
        
        
        <circle cx="140" cy="42" r="22" fill="#22b7ff" opacity="0.35" />
        
        <circle cx="134" cy="38" r="2.5" fill="#1e2945" />
        <circle cx="146" cy="38" r="2.5" fill="#1e2945" />
        <path d="M 134 46 Q 140 52 146 46" stroke="#1e2945" stroke-width="2" fill="none" stroke-linecap="round" />

        
        <g class="skeleton-bones" stroke="#ffffff" stroke-width="3" stroke-linecap="round">
          
          <circle cx="140" cy="42" r="14" fill="#ffffff" stroke="none" />
          <circle cx="135" cy="40" r="2" fill="#1e2945" stroke="none" />
          <circle cx="145" cy="40" r="2" fill="#1e2945" stroke="none" />
          <path d="M 136 47 L 144 47" stroke="#1e2945" stroke-width="1.5" />
          
          <line x1="140" y1="56" x2="140" y2="135" stroke-width="4"/>
          
          <path d="M 126 75 Q 140 82 154 75" fill="none"/>
          <path d="M 124 88 Q 140 95 156 88" fill="none"/>
          <path d="M 126 101 Q 140 108 154 101" fill="none"/>
          
          <path d="M 126 128 Q 140 136 154 128" fill="none" stroke-width="4"/>
          
          <line x1="135" y1="72" x2="105" y2="135" />
          <line x1="145" y1="72" x2="175" y2="135" />
          
          <line x1="132" y1="135" x2="128" y2="218" stroke-width="4"/>
          <line x1="148" y1="135" x2="152" y2="218" stroke-width="4"/>
        </g>
      </g>

      
      <g class="puddle-group">
        <path d="M 60 225 C 60 190, 95 170, 140 170 C 185 170, 220 190, 220 225 C 220 235, 60 235, 60 225 Z" 
              fill="#22b7ff" opacity="0.85" filter="url(#softGlow)" />
        <ellipse cx="140" cy="222" rx="75" ry="10" fill="#0ea5e9" opacity="0.4" />
        
        
        <g stroke="#ffffff" stroke-width="2.5" stroke-linecap="round">
          
          <line x1="116" y1="192" x2="126" y2="202" />
          <line x1="126" y1="192" x2="116" y2="202" />
          
          <line x1="154" y1="192" x2="164" y2="202" />
          <line x1="164" y1="192" x2="154" y2="202" />
          
          <path d="M 130 214 Q 135 208 140 214 Q 145 220 150 214" fill="none" stroke-width="2.5" />
        </g>
      </g>
    </svg>

    
    <div class="badges-col">
      <div class="badge-card">
        <span class="badge-icon">🏛️</span>
        <span class="badge-text">Support</span>
      </div>
      <div class="badge-card">
        <span class="badge-icon">🛡️</span>
        <span class="badge-text">Protection</span>
      </div>
      <div class="badge-card">
        <span class="badge-icon">🏃</span>
        <span class="badge-text">Movement</span>
      </div>
    </div>
  </div>

  <script src="{{VENDOR_CDN}}/classace-diagram.js"></script>
  <script>
    function setState(hasSkeleton) {
      const stage = document.getElementById('stageContainer');
      const btnWith = document.getElementById('btnWith');
      const btnWithout = document.getElementById('btnWithout');

      if (hasSkeleton) {
        stage.classList.remove('without-skeleton');
        btnWith.classList.add('active');
        btnWithout.classList.remove('active');
      } else {
        stage.classList.add('without-skeleton');
        btnWith.classList.remove('active');
        btnWithout.classList.add('active');
      }
    }
  </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 {
      font-family: system-ui, -apple-system, sans-serif;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 10px 12px;
      user-select: none;
      -webkit-user-select: none;
    }

    /* Header */
    .header {
      text-align: center;
      margin-bottom: 4px;
    }
    .title {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
      letter-spacing: -0.01em;
    }

    /* Legend */
    .legend-bar {
      display: flex;
      gap: 12px;
      justify-content: center;
      margin: 4px 0 6px;
      flex-wrap: wrap;
    }
    .legend-chip {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
    }
    .swatch {
      width: 14px;
      height: 8px;
      border-radius: 2px;
    }
    .swatch-amber { background: #f59e0b; }
    .swatch-blue { background: #38bdf8; }

    /* Comparison Panels */
    .panels {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
      width: 100%;
      max-width: 480px;
      flex: 1;
    }
    .panel-box {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 6px 4px 4px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
    }
    .panel-label {
      font-size: 12px;
      font-weight: 700;
      color: #334155;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      margin-bottom: 2px;
    }
    .panel-svg {
      width: 100%;
      height: 160px;
      overflow: visible;
    }

    /* Controls */
    .controls {
      width: 100%;
      max-width: 480px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin-top: 6px;
      padding-top: 6px;
      border-top: 1px solid #f1f5f9;
    }
    .slider-row {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
    }
    .slider-row label {
      white-space: nowrap;
      min-width: 80px;
    }
    input[type="range"] {
      flex: 1;
      height: 6px;
      border-radius: 3px;
      background: #cbd5e1;
      outline: none;
      accent-color: #0284c7;
      cursor: pointer;
    }
    .btn-toggle {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 6px 12px;
      font-size: 12px;
      font-weight: 600;
      color: #334155;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: background 0.2s, color 0.2s, border-color 0.2s;
      width: 100%;
    }
    .btn-toggle.active-warn {
      background: #fef2f2;
      border-color: #fca5a5;
      color: #b91c1c;
    }
  </style>
</head>
<body>

  <div class="header">
    <div class="title">Support & Structure: Tent vs Spine</div>
    <div class="legend-bar">
      <span class="legend-chip"><span class="swatch swatch-amber"></span> Frame (Poles / Spine)</span>
      <span class="legend-chip"><span class="swatch swatch-blue"></span> Covering (Fabric / Body)</span>
    </div>
  </div>

  <div class="panels">
    
    <div class="panel-box">
      <div class="panel-label">Camping Tent</div>
      <svg class="panel-svg" viewBox="0 0 160 160">
        
        <line x1="10" y1="145" x2="150" y2="145" stroke="#cbd5e1" stroke-width="2" stroke-linecap="round"/>
        
        <path id="tentFabric" fill="#38bdf8" fill-opacity="0.35" stroke="#0284c7" stroke-width="1.5" stroke-linejoin="round"/>
        
        <path id="tentPole" fill="none" stroke="#f59e0b" stroke-width="3.5" stroke-linecap="round"/>
        
        <line id="tentSeam" stroke="#0284c7" stroke-width="1" stroke-dasharray="2,2" stroke-opacity="0.6"/>
      </svg>
    </div>

    
    <div class="panel-box">
      <div class="panel-label">Human Body</div>
      <svg class="panel-svg" viewBox="0 0 160 160">
        
        <line x1="10" y1="145" x2="150" y2="145" stroke="#cbd5e1" stroke-width="2" stroke-linecap="round"/>
        
        <path id="bodySilhouette" fill="#38bdf8" fill-opacity="0.35" stroke="#0284c7" stroke-width="1.5" stroke-linejoin="round"/>
        
        <g id="skeletonGroup"></g>
      </svg>
    </div>
  </div>

  <div class="controls">
    <div class="slider-row">
      <label for="bendSlider">Bend Frame:</label>
      <input type="range" id="bendSlider" min="-30" max="30" value="0" step="1">
    </div>
    <button id="toggleBtn" class="btn-toggle">
      <span id="btnIcon">🦴</span> <span id="btnText">Remove Internal Frame</span>
    </button>
  </div>

  <script>
    const bendSlider = document.getElementById('bendSlider');
    const toggleBtn = document.getElementById('toggleBtn');
    const btnText = document.getElementById('btnText');
    const btnIcon = document.getElementById('btnIcon');

    let hasSupport = true;
    let bend = 0;

    function updateVisuals() {
      const b = hasSupport ? bend : 0;

      // ---------------- TENT RENDER ----------------
      const tentPole = document.getElementById('tentPole');
      const tentFabric = document.getElementById('tentFabric');
      const tentSeam = document.getElementById('tentSeam');

      if (hasSupport) {
        tentPole.style.display = 'inline';
        tentSeam.style.display = 'inline';

        const peakX = 80 + b * 1.1;
        const peakY = 42 + Math.abs(b) * 0.2;

        // Arching pole
        tentPole.setAttribute('d', `M 28 145 Q ${peakX} ${peakY - 12} 132 145`);

        // Fabric stretched over pole
        tentFabric.setAttribute('d', `M 24 145 L 32 140 Q ${peakX} ${peakY} 128 140 L 136 145 Z`);
        
        // Seam from peak down
        tentSeam.setAttribute('x1', peakX);
        tentSeam.setAttribute('y1', peakY);
        tentSeam.setAttribute('x2', 80 + b * 0.4);
        tentSeam.setAttribute('y2', 145);
      } else {
        // Collapsed tent
        tentPole.style.display = 'none';
        tentSeam.style.display = 'none';
        tentFabric.setAttribute('d', 'M 22 145 Q 50 143 80 141 Q 110 143 138 145 Q 80 134 22 145 Z');
      }

      // ---------------- HUMAN TORSO RENDER ----------------
      const bodySilhouette = document.getElementById('bodySilhouette');
      const skeletonGroup = document.getElementById('skeletonGroup');

      if (hasSupport) {
        skeletonGroup.style.display = 'inline';

        // Vertebral path calculations (8 vertebrae points)
        const vCount = 8;
        const points = [];
        const base = { x: 80, y: 136 };

        for (let i = 0; i <= vCount; i++) {
          const t = i / vCount;
          const px = base.x + b * Math.pow(t, 1.25) * 1.1;
          const py = base.y - t * 76 + (Math.abs(b) * 0.15 * t);
          points.push({ x: px, y: py, t });
        }

        const neck = points[points.length - 1];
        const headCenter = {
          x: neck.x + b * 0.25,
          y: neck.y - 18
        };

        // Torso contour
        const lShoulder = { x: neck.x - 28 + b * 0.1, y: neck.y + 6 };
        const rShoulder = { x: neck.x + 28 + b * 0.1, y: neck.y + 6 };
        const lHip = { x: base.x - 22, y: base.y + 8 };
        const rHip = { x: base.x + 22, y: base.y + 8 };

        bodySilhouette.setAttribute('d', `
          M ${lHip.x} ${lHip.y}
          L ${lShoulder.x} ${lShoulder.y}
          Q ${neck.x} ${neck.y - 4} ${headCenter.x - 12} ${headCenter.y}
          A 14 14 0 1 1 ${headCenter.x + 12} ${headCenter.y}
          Q ${neck.x} ${neck.y - 4} ${rShoulder.x} ${rShoulder.y}
          L ${rHip.x} ${rHip.y}
          Z
        `);

        // Build skeleton SVG primitives
        let skelHTML = '';

        // Pelvis base
        skelHTML += `<ellipse cx="${base.x}" cy="${base.y + 2}" rx="18" ry="6" fill="#f59e0b" fill-opacity="0.4" stroke="#d97706" stroke-width="1.5"/>`;

        // Rib pairs on middle vertebrae
        for (let i = 2; i <= 5; i++) {
          const pt = points[i];
          const rx = 18 - (i - 3) * 2;
          const ry = 4;
          const tilt = b * 0.35;
          skelHTML += `<ellipse cx="${pt.x}" cy="${pt.y}" rx="${rx}" ry="${ry}" transform="rotate(${tilt} ${pt.x} ${pt.y})" fill="none" stroke="#f59e0b" stroke-width="1.8" opacity="0.8"/>`;
        }

        // Vertebrae blocks (Spine)
        for (let i = 0; i < points.length; i++) {
          const pt = points[i];
          skelHTML += `<rect x="${pt.x - 3.5}" y="${pt.y - 2.5}" width="7" height="5" rx="1.5" fill="#d97706" stroke="#b45309" stroke-width="1"/>`;
        }

        // Cranium outline (Skull)
        skelHTML += `<circle cx="${headCenter.x}" cy="${headCenter.y}" r="11" fill="#f59e0b" fill-opacity="0.3" stroke="#d97706" stroke-width="1.5"/>`;

        skeletonGroup.innerHTML = skelHTML;
      } else {
        // Slumped body blob
        skeletonGroup.style.display = 'none';
        skeletonGroup.innerHTML = '';
        bodySilhouette.setAttribute('d', 'M 25 145 Q 45 138 80 134 Q 115 138 135 145 Q 80 140 25 145 Z');
      }
    }

    bendSlider.addEventListener('input', (e) => {
      bend = parseFloat(e.target.value);
      updateVisuals();
    });

    toggleBtn.addEventListener('click', () => {
      hasSupport = !hasSupport;
      if (hasSupport) {
        toggleBtn.classList.remove('active-warn');
        btnIcon.textContent = '🦴';
        btnText.textContent = 'Remove Internal Frame';
        bendSlider.disabled = false;
      } else {
        toggleBtn.classList.add('active-warn');
        btnIcon.textContent = '↺';
        btnText.textContent = 'Restore Internal Frame';
        bendSlider.disabled = true;
      }
      updateVisuals();
    });

    updateVisuals();
  </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;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      width: 100%;
      min-height: 100%;
      background: transparent;
      padding: 8px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .grid-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      grid-template-rows: 1fr 1fr;
      gap: 10px;
      width: 100%;
      max-width: 480px;
      margin: 0 auto;
    }

    .tile {
      border-radius: 14px;
      padding: 14px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      cursor: pointer;
      user-select: none;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      min-height: 140px;
    }

    .tile:active {
      transform: scale(0.98);
    }

    /* Pastel themes */
    .tile-movement {
      background: #e0f2fe;
      border: 1.5px solid #7dd3fc;
    }
    .tile-growth {
      background: #dcfce7;
      border: 1.5px solid #86efac;
    }
    .tile-repair {
      background: #ffedd5;
      border: 1.5px solid #fdba74;
    }
    .tile-warmth {
      background: #f3e8ff;
      border: 1.5px solid #d8b4fe;
    }

    .visual-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 28px;
      margin-bottom: 8px;
      height: 36px;
    }

    .arrow {
      font-size: 16px;
      font-weight: bold;
      color: #16a34a;
    }

    .title {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 3px;
    }

    .desc {
      font-size: 12px;
      font-weight: 500;
      color: #475569;
      line-height: 1.2;
    }

    .temp-badge {
      font-size: 11px;
      font-weight: 700;
      background: #e9d5ff;
      color: #6b21a8;
      padding: 2px 5px;
      border-radius: 6px;
    }

    @media (max-width: 340px) {
      .visual-row {
        font-size: 24px;
      }
      .title {
        font-size: 14px;
      }
      .desc {
        font-size: 11px;
      }
      .tile {
        padding: 10px 6px;
        min-height: 125px;
      }
    }
  </style>
</head>
<body>
  <div class="grid-container">
    
    <div class="tile tile-movement">
      <div class="visual-row">
        <span>🐆</span>
        <span style="font-size: 20px;">💨</span>
      </div>
      <div class="title">1. Movement</div>
      <div class="desc">Running & hunting</div>
    </div>

    
    <div class="tile tile-growth">
      <div class="visual-row">
        <span style="font-size: 20px;">🐣</span>
        <span class="arrow">➔</span>
        <span>🐔</span>
      </div>
      <div class="title">2. Growth</div>
      <div class="desc">Building bigger bodies</div>
    </div>

    
    <div class="tile tile-repair">
      <div class="visual-row">
        <span>🐾</span>
        <span style="font-size: 20px;">🩹</span>
        <span style="font-size: 16px;">✨</span>
      </div>
      <div class="title">3. Repair</div>
      <div class="desc">Healing skin & cells</div>
    </div>

    
    <div class="tile tile-warmth">
      <div class="visual-row">
        <span>🌡️</span>
        <span class="temp-badge">37°C</span>
        <span>🐧</span>
      </div>
      <div class="title">4. Warmth</div>
      <div class="desc">Keeping body heat</div>
    </div>
  </div>
</body>
</html>

Why Animals Need Nutrition and Energy

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
    }

    .source-panel {
      background: #f0fdf4;
      border: 2px solid #86efac;
      border-radius: 14px;
      padding: 10px 16px;
      display: flex;
      align-items: center;
      gap: 12px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.04);
      cursor: pointer;
      user-select: none;
      transition: border-color 0.25s ease;
    }
    .source-icons {
      font-size: 28px;
      line-height: 1;
      display: flex;
      gap: 4px;
      align-items: center;
    }
    .source-label {
      font-size: 15px;
      font-weight: 700;
      color: #166534;
      line-height: 1.2;
    }
    .source-sub {
      font-size: 12px;
      font-weight: 600;
      color: #15803d;
    }

    /* Energy Distribution Hub */
    .flow-svg {
      width: 100%;
      max-width: 480px;
      height: 40px;
      display: block;
      margin: 2px auto;
    }
    .flow-line {
      stroke: #cbd5e1;
      stroke-width: 2.5;
      stroke-linecap: round;
      fill: none;
      transition: stroke 0.3s ease, stroke-width 0.3s ease;
    }
    .flow-line.active {
      stroke: #f59e0b;
      stroke-width: 3.5;
    }

    /* 4 Life Jobs Grid */
    .grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 8px;
      width: 100%;
      max-width: 500px;
    }
    @media (min-width: 540px) {
      .grid {
        grid-template-columns: repeat(4, 1fr);
      }
    }

    .card-job {
      background: #f8fafc;
      border: 2px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      gap: 6px;
      cursor: pointer;
      user-select: none;
      transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
    }
    .card-job.active {
      background: #fffbeb;
      border-color: #f59e0b;
      box-shadow: 0 4px 12px rgba(245, 158, 11, 0.18);
    }

    .job-icon {
      font-size: 26px;
      line-height: 1;
    }
    .job-title {
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
      line-height: 1.1;
    }
    .job-desc {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
      line-height: 1.2;
    }
    .card-job.active .job-title {
      color: #b45309;
    }
    .card-job.active .job-desc {
      color: #92400e;
    }

    /* Controls bar */
    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-top: 6px;
      width: 100%;
    }
    .btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #334155;
      font-size: 13px;
      font-weight: 600;
      padding: 6px 12px;
      border-radius: 20px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: background 0.2s;
    }
    .btn:hover {
      background: #e2e8f0;
    }
    .btn.active-all {
      background: #22b7ff;
      border-color: #0284c7;
      color: #ffffff;
    }
    .dot-nav {
      display: flex;
      gap: 6px;
    }
    .nav-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      transition: background-color 0.25s ease, transform 0.25s ease;
    }
    .nav-dot.active {
      background: #f59e0b;
      transform: scale(1.25);
    }
  </style>
</head>
<body>

  
  <div class="source-panel" id="sourceBtn" title="Click to show all jobs">
    <div class="source-icons">🐻 🐟 🫐</div>
    <div>
      <div class="source-label">1 Meal</div>
      <div class="source-sub">Energy &amp; Nutrients</div>
    </div>
  </div>

  
  <svg class="flow-svg" viewBox="0 0 400 40" preserveAspectRatio="none">
    <path id="line-0" class="flow-line active" d="M 200 0 C 200 20, 50 10, 50 40" />
    <path id="line-1" class="flow-line" d="M 200 0 C 200 20, 150 15, 150 40" />
    <path id="line-2" class="flow-line" d="M 200 0 C 200 20, 250 15, 250 40" />
    <path id="line-3" class="flow-line" d="M 200 0 C 200 20, 350 10, 350 40" />
  </svg>

  
  <div class="grid">
    <div class="card-job active" data-index="0">
      <span class="job-icon">🏃</span>
      <span class="job-title">Movement</span>
      <span class="job-desc">Catching fish</span>
    </div>

    <div class="card-job" data-index="1">
      <span class="job-icon">⚖️</span>
      <span class="job-title">Growth</span>
      <span class="job-desc">Storing fat</span>
    </div>

    <div class="card-job" data-index="2">
      <span class="job-icon">🩹</span>
      <span class="job-title">Repair</span>
      <span class="job-desc">Healing skin</span>
    </div>

    <div class="card-job" data-index="3">
      <span class="job-icon">🌡️</span>
      <span class="job-title">Warmth</span>
      <span class="job-desc">Cold water</span>
    </div>
  </div>

  
  <div class="controls">
    <button class="btn" id="playBtn">⏸ Pause</button>
    <div class="dot-nav">
      <div class="nav-dot active" data-index="0" title="Movement"></div>
      <div class="nav-dot" data-index="1" title="Growth"></div>
      <div class="nav-dot" data-index="2" title="Repair"></div>
      <div class="nav-dot" data-index="3" title="Warmth"></div>
    </div>
    <button class="btn" id="allBtn">All 4 Jobs</button>
  </div>

  <script>
    const cards = document.querySelectorAll('.card-job');
    const lines = [
      document.getElementById('line-0'),
      document.getElementById('line-1'),
      document.getElementById('line-2'),
      document.getElementById('line-3')
    ];
    const dots = document.querySelectorAll('.nav-dot');
    const playBtn = document.getElementById('playBtn');
    const allBtn = document.getElementById('allBtn');
    const sourceBtn = document.getElementById('sourceBtn');

    let current = 0;
    let isPlaying = true;
    let timer = null;
    let isAllActive = false;

    function setStep(idx) {
      isAllActive = false;
      allBtn.classList.remove('active-all');
      current = idx;

      cards.forEach((card, i) => {
        card.classList.toggle('active', i === idx);
      });
      lines.forEach((line, i) => {
        line.classList.toggle('active', i === idx);
      });
      dots.forEach((dot, i) => {
        dot.classList.toggle('active', i === idx);
      });
    }

    function showAll() {
      isAllActive = true;
      allBtn.classList.add('active-all');
      cards.forEach(card => card.classList.add('active'));
      lines.forEach(line => line.classList.add('active'));
      dots.forEach(dot => dot.classList.add('active'));
    }

    function nextStep() {
      if (isAllActive) {
        setStep(0);
      } else {
        setStep((current + 1) % 4);
      }
    }

    function startAuto() {
      if (timer) clearInterval(timer);
      timer = setInterval(nextStep, 3200);
      isPlaying = true;
      playBtn.textContent = '⏸ Pause';
    }

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

    cards.forEach((card, idx) => {
      card.addEventListener('click', () => {
        setStep(idx);
        pauseAuto();
      });
    });

    dots.forEach((dot, idx) => {
      dot.addEventListener('click', () => {
        setStep(idx);
        pauseAuto();
      });
    });

    playBtn.addEventListener('click', () => {
      if (isPlaying) {
        pauseAuto();
      } else {
        startAuto();
      }
    });

    allBtn.addEventListener('click', () => {
      showAll();
      pauseAuto();
    });

    sourceBtn.addEventListener('click', () => {
      showAll();
      pauseAuto();
    });

    // Start auto sequence
    startAuto();
  </script>
</body>
</html>

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

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e293b;
      padding: 8px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      min-height: 100%;
      user-select: none;
    }

    /* Interactive mode switcher */
    .controls {
      display: flex;
      justify-content: center;
      gap: 6px;
    }

    .btn-tab {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      transition: all 0.2s ease;
    }

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

    /* Comparison Grid */
    .grid-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
      position: relative;
      flex: 1;
    }

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

    .panel {
      border-radius: 12px;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      transition: opacity 0.3s ease, transform 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .panel-plant {
      background: #f0fdf4;
      border: 2px solid #bbf7d0;
    }

    .panel-animal {
      background: #fff7ed;
      border: 2px solid #fed7aa;
    }

    .panel.dimmed {
      opacity: 0.35;
    }

    .badge-title {
      font-size: 14px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      padding: 3px 10px;
      border-radius: 999px;
      margin-bottom: 6px;
    }

    .badge-plant {
      background: #dcfce7;
      color: #15803d;
    }

    .badge-animal {
      background: #ffedd5;
      color: #c2410c;
    }

    .diagram-stage {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      width: 100%;
      margin: auto 0;
    }

    .entity-card {
      background: #ffffff;
      border-radius: 10px;
      padding: 6px 12px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.06);
      display: flex;
      align-items: center;
      gap: 8px;
      width: 88%;
      max-width: 220px;
      justify-content: center;
    }

    .entity-icon {
      font-size: 24px;
      line-height: 1;
    }

    .entity-label {
      font-size: 13px;
      font-weight: 600;
    }

    .arrow-flow {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      font-weight: 700;
      color: #64748b;
      position: relative;
    }

    .arrow-icon {
      font-size: 16px;
      line-height: 1;
      animation: pulseArrow 1.6s infinite ease-in-out;
    }

    .panel-plant .arrow-icon {
      color: #16a34a;
    }

    .panel-animal .arrow-icon {
      color: #ea580c;
    }

    @keyframes pulseArrow {
      0%, 100% { transform: translateY(0); opacity: 0.6; }
      50% { transform: translateY(3px); opacity: 1; }
    }

    .callout-pill {
      font-size: 12px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 6px;
      text-align: center;
      margin-top: 4px;
    }

    .callout-plant {
      background: #dcfce7;
      color: #166534;
      border: 1px dashed #86efac;
    }

    .callout-animal {
      background: #ffedd5;
      color: #9a3412;
      border: 1px dashed #fdba74;
    }

    /* Bottom Summary */
    .summary-strip {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 8px 12px;
      font-size: 13px;
      font-weight: 600;
      text-align: center;
      color: #334155;
    }

    .highlight-green {
      color: #15803d;
    }

    .highlight-orange {
      color: #c2410c;
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <button class="btn-tab active" onclick="setMode('both')">Compare Both</button>
    <button class="btn-tab" onclick="setMode('plant')">🌿 Plants</button>
    <button class="btn-tab" onclick="setMode('animal')">🦊 Animals</button>
  </div>

  
  <div class="grid-container">
    
    
    <div class="panel panel-plant" id="panelPlant">
      <span class="badge-title badge-plant">Plants (Producers)</span>
      
      <div class="diagram-stage">
        <div class="entity-card">
          <span class="entity-icon">☀️</span>
          <span class="entity-label">Sunlight</span>
        </div>

        <div class="arrow-flow">
          <span>absorbs</span>
          <span class="arrow-icon">▼</span>
        </div>

        <div class="entity-card">
          <span class="entity-icon">🌱</span>
          <span class="entity-label">Leaves & Roots</span>
        </div>
      </div>

      <div class="callout-pill callout-plant">
        ✨ Makes own food internally
      </div>
    </div>

    
    <div class="panel panel-animal" id="panelAnimal">
      <span class="badge-title badge-animal">Animals (Consumers)</span>
      
      <div class="diagram-stage">
        <div class="entity-card">
          <span class="entity-icon">🥕</span>
          <span class="entity-label">Plants</span>
        </div>

        <div class="arrow-flow">
          <span>eaten by</span>
          <span class="arrow-icon">▼</span>
        </div>

        <div class="entity-card">
          <span class="entity-icon">🐇</span>
          <span class="entity-label">Herbivore</span>
        </div>

        <div class="arrow-flow">
          <span>eaten by</span>
          <span class="arrow-icon">▼</span>
        </div>

        <div class="entity-card">
          <span class="entity-icon">🦊</span>
          <span class="entity-label">Carnivore</span>
        </div>
      </div>

      <div class="callout-pill callout-animal">
        🍽️ Must eat food for energy
      </div>
    </div>

  </div>

  
  <div class="summary-strip" id="summaryText">
    <strong class="highlight-green">Plants</strong> make energy from light · <strong class="highlight-orange">Animals</strong> must consume food
  </div>

  <script>
    function setMode(mode) {
      const plant = document.getElementById('panelPlant');
      const animal = document.getElementById('panelAnimal');
      const buttons = document.querySelectorAll('.btn-tab');

      buttons.forEach(btn => btn.classList.remove('active'));

      if (mode === 'both') {
        buttons[0].classList.add('active');
        plant.classList.remove('dimmed');
        animal.classList.remove('dimmed');
      } else if (mode === 'plant') {
        buttons[1].classList.add('active');
        plant.classList.remove('dimmed');
        animal.classList.add('dimmed');
      } else if (mode === 'animal') {
        buttons[2].classList.add('active');
        plant.classList.add('dimmed');
        animal.classList.remove('dimmed');
      }
    }
  </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 {
      font-family: system-ui, -apple-system, sans-serif;
      color: #0f172a;
      background: transparent;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 8px;
    }

    .main-grid {
      display: grid;
      grid-template-columns: 1fr 1.15fr;
      gap: 16px;
      width: 100%;
      max-width: 620px;
    }

    @media (max-width: 500px) {
      .main-grid {
        grid-template-columns: 1fr;
        gap: 12px;
      }
    }

    .panel {
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
    }

    .panel-title {
      font-size: 13px;
      font-weight: 700;
      color: #334155;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 6px;
    }

    /* Comparison section */
    .compare-svg {
      width: 100%;
      height: 190px;
    }

    .highlight-badge {
      background: #fee2e2;
      border: 1px solid #ef4444;
      color: #991b1b;
      font-size: 11.5px;
      font-weight: 700;
      padding: 5px 12px;
      border-radius: 20px;
      text-align: center;
      margin-top: 6px;
      line-height: 1.2;
    }

    /* Action section */
    .action-container {
      width: 100%;
      height: 190px;
      position: relative;
      overflow: hidden;
      border-radius: 8px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
    }

    .action-svg {
      width: 100%;
      height: 100%;
    }

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

    .btn-step {
      flex: 1;
      padding: 7px 4px;
      font-size: 12px;
      font-weight: 700;
      border: 1.5px solid #94a3b8;
      border-radius: 6px;
      background: #ffffff;
      color: #0f172a;
      cursor: pointer;
      text-align: center;
      transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    }

    .btn-step.active {
      background: #0284c7;
      border-color: #0369a1;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.35);
    }
  </style>
</head>
<body>

  <div class="main-grid">
    
    <div class="panel">
      <div class="panel-title">Structure Comparison</div>
      <svg class="compare-svg" viewBox="0 0 240 190" aria-label="Canine tooth compared with fork tine">
        <defs>
          <radialGradient id="apexGlow" cx="50%" cy="50%" r="50%">
            <stop offset="0%" stop-color="#ef4444" stop-opacity="0.85"/>
            <stop offset="100%" stop-color="#ef4444" stop-opacity="0"/>
          </radialGradient>
          <linearGradient id="metalGrad" x1="0%" y1="0%" x2="100%" y2="0%">
            <stop offset="0%" stop-color="#94a3b8"/>
            <stop offset="35%" stop-color="#e2e8f0"/>
            <stop offset="70%" stop-color="#cbd5e1"/>
            <stop offset="100%" stop-color="#64748b"/>
          </linearGradient>
        </defs>

        
        <g transform="translate(45, 10)">
          
          <path d="M 30 15 C 22 45 20 85 22 140 L 38 140 C 40 85 38 45 30 15 Z" fill="url(#metalGrad)" stroke="#64748b" stroke-width="1.2" stroke-linejoin="round"/>
          
          <path d="M 30 16 L 30 138" stroke="#ffffff" stroke-width="1.2" stroke-linecap="round" opacity="0.85"/>
          
          <circle cx="30" cy="15" r="14" fill="url(#apexGlow)"/>
          <circle cx="30" cy="15" r="4.5" fill="#ef4444"/>
          <text x="30" y="160" font-size="12" font-weight="700" fill="#334155" text-anchor="middle">Fork Tine</text>
        </g>

        
        <g transform="translate(135, 10)">
          
          <path d="M 0 140 Q 30 115 60 140 L 60 150 L 0 150 Z" fill="#fda4af"/>
          
          <path d="M 14 125 C 20 148 30 155 30 155 C 30 155 40 148 46 125 Z" fill="#fef08a" opacity="0.7"/>
          
          <path d="M 12 125 C 10 90 14 45 30 15 C 46 45 50 90 48 125 C 40 120 20 120 12 125 Z" fill="#ffffff" stroke="#94a3b8" stroke-width="1.2"/>
          
          <path d="M 30 15 L 30 105" stroke="#f1f5f9" stroke-width="2" stroke-linecap="round"/>
          
          <circle cx="30" cy="15" r="14" fill="url(#apexGlow)"/>
          <circle cx="30" cy="15" r="4.5" fill="#ef4444"/>
          <text x="30" y="160" font-size="12" font-weight="700" fill="#0f172a" text-anchor="middle">Canine</text>
        </g>
      </svg>
      <div class="highlight-badge">Pointed Tip for Gripping &amp; Tearing</div>
    </div>

    
    <div class="panel">
      <div class="panel-title">Function Demo</div>
      <div class="action-container">
        <svg class="action-svg" viewBox="0 0 280 190">
          <defs>
            <filter id="shadow" x="-10%" y="-10%" width="120%" height="120%">
              <feDropShadow dx="0" dy="2" stdDeviation="2" flood-opacity="0.12"/>
            </filter>
          </defs>

          
          <g id="breadLeft">
            <path d="M 25 90 C 25 65 65 62 105 62 L 105 118 C 65 118 25 115 25 90 Z" fill="#d97706" opacity="0.85"/>
            
            <ellipse cx="60" cy="80" rx="12" ry="6" fill="#b45309" opacity="0.4"/>
            <ellipse cx="85" cy="100" rx="8" ry="4" fill="#b45309" opacity="0.4"/>
          </g>

          
          <g id="breadRight">
            <path id="rightSlice" d="M 105 62 C 145 62 185 65 185 90 C 185 115 145 118 105 118 Z" fill="#f59e0b"/>
            <ellipse cx="140" cy="85" rx="14" ry="7" fill="#d97706" opacity="0.4"/>
            
            <path id="tearEdge" d="M 105 62 Q 108 75 103 90 Q 109 105 105 118" stroke="#d97706" stroke-width="2" fill="none"/>
          </g>

          
          <g id="topTooth" transform="translate(0, 0)">
            <path d="M 90 8 C 95 32 100 45 105 65 C 110 45 115 32 120 8 Z" fill="#ffffff" stroke="#94a3b8" stroke-width="1.5" filter="url(#shadow)"/>
            <circle cx="105" cy="65" r="3.5" fill="#ef4444"/>
          </g>

          
          <g id="bottomTooth" transform="translate(0, 0)">
            <path d="M 90 172 C 95 148 100 135 105 115 C 110 135 115 148 120 172 Z" fill="#ffffff" stroke="#94a3b8" stroke-width="1.5" filter="url(#shadow)"/>
            <circle cx="105" cy="115" r="3.5" fill="#ef4444"/>
          </g>

          
          <g id="tearArrows" opacity="0">
            <path d="M 175 90 L 220 90 M 212 82 L 222 90 L 212 98" stroke="#ef4444" stroke-width="3.5" stroke-linecap="round" stroke-linejoin="round" fill="none"/>
            <text x="200" y="74" font-size="11" font-weight="700" fill="#dc2626" text-anchor="middle">PULL</text>
          </g>
        </svg>
      </div>

      <div class="controls">
        <button class="btn-step active" id="btn1" onclick="setStep(0)">1. Pierce &amp; Grip</button>
        <button class="btn-step" id="btn2" onclick="setStep(1)">2. Tear</button>
      </div>
    </div>
  </div>

  <script>
    const topTooth = document.getElementById('topTooth');
    const bottomTooth = document.getElementById('bottomTooth');
    const breadRight = document.getElementById('breadRight');
    const tearArrows = document.getElementById('tearArrows');
    const btn1 = document.getElementById('btn1');
    const btn2 = document.getElementById('btn2');

    let currentStep = 0;
    let autoTimer = null;

    function applyStep(step) {
      currentStep = step;
      if (step === 0) {
        // Pierce & Grip: Teeth bite deep into pita bread
        topTooth.style.transition = 'transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1)';
        bottomTooth.style.transition = 'transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1)';
        breadRight.style.transition = 'transform 0.4s ease';
        tearArrows.style.transition = 'opacity 0.3s ease';

        topTooth.style.transform = 'translateY(16px)';
        bottomTooth.style.transform = 'translateY(-16px)';
        breadRight.style.transform = 'translate(0px, 0px) rotate(0deg)';
        tearArrows.style.opacity = '0';

        btn1.classList.add('active');
        btn2.classList.remove('active');
      } else {
        // Tear: Bread is pulled away while canines hold grip
        topTooth.style.transition = 'transform 0.3s ease';
        bottomTooth.style.transition = 'transform 0.3s ease';
        breadRight.style.transition = 'transform 0.6s cubic-bezier(0.25, 1, 0.5, 1)';
        tearArrows.style.transition = 'opacity 0.3s ease';

        topTooth.style.transform = 'translateY(16px)';
        bottomTooth.style.transform = 'translateY(-16px)';
        breadRight.style.transform = 'translate(45px, 8px) rotate(8deg)';
        tearArrows.style.opacity = '1';

        btn1.classList.remove('active');
        btn2.classList.add('active');
      }
    }

    function setStep(step) {
      clearInterval(autoTimer);
      applyStep(step);
      startLoop();
    }

    function startLoop() {
      autoTimer = setInterval(() => {
        applyStep(currentStep === 0 ? 1 : 0);
      }, 2600);
    }

    // Initialize
    applyStep(0);
    startLoop();
  </script>
</body>
</html>

The Types and Functions of Human Teeth

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="1:1">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #ffffff;
      color: #1e2945;
      width: 100%;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .teeth-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      width: 100%;
    }

    .tooth-card {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .tooth-name {
      font-size: 15px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 4px;
    }

    .tooth-svg {
      width: 100%;
      max-width: 130px;
      height: 110px;
    }

    .label-badge {
      font-size: 11px;
      font-weight: 600;
      color: #0369a1;
      background: #e0f2fe;
      border: 1px solid #bae6fd;
      border-radius: 6px;
      padding: 4px 6px;
      margin-top: 6px;
      line-height: 1.2;
    }

    .grind-box {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
    }

    .grind-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      margin-bottom: 6px;
      padding: 0 4px;
    }

    .grind-title {
      font-size: 13px;
      font-weight: 700;
      color: #334155;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .action-btn {
      appearance: none;
      background: #0284c7;
      color: #ffffff;
      border: none;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      padding: 5px 10px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .stage-canvas {
      width: 100%;
      max-width: 280px;
      height: 125px;
      position: relative;
      overflow: hidden;
    }

    /* SVG tooth details */
    .gum-line {
      fill: #fda4af;
    }
    .tooth-enamel {
      fill: #ffffff;
      stroke: #94a3b8;
      stroke-width: 2;
    }
    .tooth-shade {
      fill: #f1f5f9;
    }
    .cusp-mark {
      fill: none;
      stroke: #38bdf8;
      stroke-width: 2.5;
      stroke-linecap: round;
    }
    .arrow-line {
      stroke: #0284c7;
      stroke-width: 1.5;
      stroke-dasharray: 3 2;
    }
  </style>
</head>
<body>

  
  <div class="teeth-grid">
    
    <div class="tooth-card">
      <div class="tooth-name">Premolar</div>
      <svg class="tooth-svg" viewBox="0 0 100 100">
        
        <path d="M38,52 C36,75 40,88 45,94 C48,94 51,75 50,52 Z" fill="#e2e8f0" stroke="#cbd5e1" stroke-width="1.5" />
        <path d="M50,52 C52,75 58,88 62,94 C65,94 62,75 58,52 Z" fill="#e2e8f0" stroke="#cbd5e1" stroke-width="1.5" />
        
        <path d="M20,54 Q50,62 80,54 Q85,62 75,64 Q50,70 25,64 Z" class="gum-line" />
        
        <path d="M28,52 C26,38 32,18 40,18 C46,18 48,26 50,26 C52,26 54,18 60,18 C68,18 74,38 72,52 Z" class="tooth-enamel" />
        <path d="M40,24 Q50,30 60,24" fill="none" stroke="#cbd5e1" stroke-width="1.5" />
        
        <path d="M34,16 Q40,12 46,16" class="cusp-mark" />
        <path d="M54,16 Q60,12 66,16" class="cusp-mark" />
      </svg>
      <div class="label-badge">Bicuspid bumps<br>(crushing)</div>
    </div>

    
    <div class="tooth-card">
      <div class="tooth-name">Molar</div>
      <svg class="tooth-svg" viewBox="0 0 100 100">
        
        <path d="M26,52 C24,76 22,90 28,95 C33,90 36,75 38,52 Z" fill="#e2e8f0" stroke="#cbd5e1" stroke-width="1.5" />
        <path d="M45,52 C46,74 48,88 51,95 C54,88 55,74 55,52 Z" fill="#e2e8f0" stroke="#cbd5e1" stroke-width="1.5" />
        <path d="M62,52 C64,75 67,90 72,95 C78,90 76,76 74,52 Z" fill="#e2e8f0" stroke="#cbd5e1" stroke-width="1.5" />
        
        <path d="M12,54 Q50,62 88,54 Q92,62 80,65 Q50,71 20,65 Z" class="gum-line" />
        
        <path d="M18,52 C16,36 20,18 30,18 C36,18 38,22 43,22 C47,22 50,18 57,18 C64,18 67,22 71,22 C76,22 80,18 83,26 C86,34 84,45 82,52 Z" class="tooth-enamel" />
        
        <line x1="28" y1="20" x2="72" y2="20" stroke="#0284c7" stroke-width="2" stroke-dasharray="2 2" />
        <path d="M25,26 Q50,30 75,26" fill="none" stroke="#cbd5e1" stroke-width="1.5" />
        <path d="M50,22 L50,38" stroke="#cbd5e1" stroke-width="1.5" />
      </svg>
      <div class="label-badge">Flat Grinding Table<br>(millstone)</div>
    </div>
  </div>

  
  <div class="grind-box">
    <div class="grind-header">
      <div class="grind-title">
        <span>⚙️</span> Grinding Action
      </div>
      <button class="action-btn" id="grindBtn">Chew 🌰</button>
    </div>

    <svg class="stage-canvas" viewBox="0 0 260 120" id="grindScene">
      
      <g id="upperMolar" transform="translate(0, 0)">
        <path d="M90,30 C90,15 105,10 130,10 C155,10 170,15 170,30 C165,35 155,36 150,34 C142,32 138,35 130,35 C122,35 118,32 110,34 C105,36 95,35 90,30 Z" fill="#ffffff" stroke="#64748b" stroke-width="2" />
        
        <path d="M102,10 C100,-2 108,-10 114,-12" stroke="#94a3b8" stroke-width="3" fill="none" stroke-linecap="round" />
        <path d="M146,10 C148,-2 154,-10 160,-12" stroke="#94a3b8" stroke-width="3" fill="none" stroke-linecap="round" />
        <line x1="94" y1="33" x2="166" y2="33" stroke="#0284c7" stroke-width="2" />
      </g>

      
      <g id="foodPiece" transform="translate(130, 60)">
        
        <ellipse id="wholeNut" cx="0" cy="0" rx="8" ry="6" fill="#b45309" stroke="#78350f" stroke-width="1.5" />
        
        <g id="crumbs" opacity="0">
          <circle cx="-9" cy="1" r="2" fill="#d97706" />
          <circle cx="-5" cy="-2" r="1.5" fill="#b45309" />
          <circle cx="-1" cy="2" r="2.5" fill="#f59e0b" />
          <circle cx="4" cy="-1" r="1.8" fill="#d97706" />
          <circle cx="8" cy="2" r="2.2" fill="#b45309" />
          <circle cx="12" cy="0" r="1.5" fill="#f59e0b" />
          <circle cx="0" cy="-3" r="1.2" fill="#78350f" />
        </g>
      </g>

      
      <g id="lowerMolar" transform="translate(0, 0)">
        <path d="M90,90 C90,105 105,110 130,110 C155,110 170,105 170,90 C165,85 155,84 150,86 C142,88 138,85 130,85 C122,85 118,88 110,86 C105,84 95,85 90,90 Z" fill="#ffffff" stroke="#64748b" stroke-width="2" />
        <line x1="94" y1="87" x2="166" y2="87" stroke="#0284c7" stroke-width="2" />
      </g>

      
      <g id="motionArrows" opacity="0.6">
        <path d="M72,40 L72,25 Q72,20 78,20 L84,20" fill="none" stroke="#0284c7" stroke-width="1.5" stroke-linecap="round" />
        <polygon points="82,17 88,20 82,23" fill="#0284c7" />
        <path d="M188,20 L194,20 Q200,20 200,25 L200,40" fill="none" stroke="#0284c7" stroke-width="1.5" stroke-linecap="round" />
        <polygon points="197,38 200,44 203,38" fill="#0284c7" />
      </g>
    </svg>
  </div>

  <script>
    const grindBtn = document.getElementById('grindBtn');
    const upperMolar = document.getElementById('upperMolar');
    const wholeNut = document.getElementById('wholeNut');
    const crumbs = document.getElementById('crumbs');
    
    let isAnimating = false;

    function runGrindCycle() {
      if (isAnimating) return;
      isAnimating = true;
      grindBtn.disabled = true;
      grindBtn.style.opacity = '0.6';

      // Step 0: Reset
      upperMolar.setAttribute('transform', 'translate(0, 0)');
      wholeNut.setAttribute('opacity', '1');
      crumbs.setAttribute('opacity', '0');

      // Step 1: Lower upper molar down (Crush)
      setTimeout(() => {
        upperMolar.style.transition = 'transform 0.4s ease-in';
        upperMolar.setAttribute('transform', 'translate(0, 22)');
      }, 50);

      // Step 2: Nut cracks, grind left
      setTimeout(() => {
        wholeNut.setAttribute('opacity', '0.3');
        crumbs.setAttribute('opacity', '0.7');
        upperMolar.style.transition = 'transform 0.4s ease-in-out';
        upperMolar.setAttribute('transform', 'translate(-12, 24)');
      }, 500);

      // Step 3: Grind right (pulverize)
      setTimeout(() => {
        wholeNut.setAttribute('opacity', '0');
        crumbs.setAttribute('opacity', '1');
        upperMolar.setAttribute('transform', 'translate(12, 24)');
      }, 950);

      // Step 4: Center grind
      setTimeout(() => {
        upperMolar.setAttribute('transform', 'translate(0, 23)');
      }, 1400);

      // Step 5: Lift up
      setTimeout(() => {
        upperMolar.style.transition = 'transform 0.5s ease-out';
        upperMolar.setAttribute('transform', 'translate(0, 0)');
      }, 1850);

      // Finish & allow replay
      setTimeout(() => {
        isAnimating = false;
        grindBtn.disabled = false;
        grindBtn.style.opacity = '1';
      }, 2400);
    }

    grindBtn.addEventListener('click', runGrindCycle);

    // Auto run once gently on load
    setTimeout(runGrindCycle, 800);
  </script>
</body>
</html>

science.ks1

Child standards (2)

Aligned learning resources

Related diagrams