<!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>Crude Oil: Formation vs Consumption</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e293b;
      background: transparent;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 8px 4px;
    }

    .diagram-stage {
      width: 100%;
      max-width: 580px;
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .badge-wrap {
      margin-bottom: 8px;
    }

    .finite-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #fef2f2;
      border: 1px solid #fca5a5;
      color: #b91c1c;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      padding: 4px 12px;
      border-radius: 9999px;
    }

    .svg-container {
      width: 100%;
      height: auto;
      max-height: 330px;
    }

    .label-title {
      font-size: 14px;
      font-weight: 700;
      fill: #1e293b;
    }

    .label-rate {
      font-size: 12px;
      font-weight: 600;
    }

    .rate-in {
      fill: #0284c7;
    }

    .rate-out {
      fill: #dc2626;
    }

    /* Animation Styles */
    @keyframes slowDrip {
      0% { transform: translateY(0) scale(0.6); opacity: 0; }
      25% { transform: translateY(0) scale(1); opacity: 1; }
      75% { transform: translateY(34px) scale(0.9); opacity: 1; }
      80% { transform: translateY(38px) scale(0.3); opacity: 0; }
      100% { transform: translateY(0) scale(0.6); opacity: 0; }
    }

    @keyframes drainLevel {
      0% { height: 125px; y: 95px; }
      85% { height: 16px; y: 204px; }
      100% { height: 16px; y: 204px; }
    }

    @keyframes streamFlow {
      0% { stroke-dashoffset: 0; }
      100% { stroke-dashoffset: -32; }
    }

    .dripping-drop {
      transform-origin: 95px 126px;
      animation: slowDrip 4s infinite cubic-bezier(0.4, 0, 0.2, 1);
    }

    .oil-fill-rect {
      animation: drainLevel 6s infinite ease-in-out;
    }

    .hose-stream {
      stroke-dasharray: 8 4;
      animation: streamFlow 0.5s linear infinite;
    }

    .btn-replay {
      margin-top: 8px;
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      color: #334155;
      font-size: 13px;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 6px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: background-color 0.2s, border-color 0.2s;
    }

    .btn-replay:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }
  </style>
</head>
<body>

  <div class="diagram-stage">
    <div class="badge-wrap">
      <div class="finite-badge">
        <span>⚠</span> Finite & Non-Renewable
      </div>
    </div>

    <svg class="svg-container" viewBox="0 0 540 300" fill="none" xmlns="http://www.w3.org/2000/svg">
      
      <defs>
        <linearGradient id="oilGrad" x1="0%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#451a03"/>
          <stop offset="60%" stop-color="#1c1917"/>
          <stop offset="100%" stop-color="#09090b"/>
        </linearGradient>

        <linearGradient id="tankSheen" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#ffffff" stop-opacity="0.2"/>
          <stop offset="15%" stop-color="#ffffff" stop-opacity="0.05"/>
          <stop offset="85%" stop-color="#ffffff" stop-opacity="0.05"/>
          <stop offset="100%" stop-color="#ffffff" stop-opacity="0.2"/>
        </linearGradient>

        <clipPath id="tankInnerClip">
          <rect x="192" y="92" width="156" height="130" rx="8" />
        </clipPath>
      </defs>

      
      <g>
        <text x="95" y="42" text-anchor="middle" class="label-title">Formation Rate</text>
        <text x="95" y="62" text-anchor="middle" class="label-rate rate-in">~100M Years</text>

        
        <path d="M 40 100 L 95 100 L 95 120" stroke="#94a3b8" stroke-width="7" stroke-linecap="round" stroke-linejoin="round"/>
        <rect x="87" y="118" width="16" height="6" rx="2" fill="#64748b" />
        <rect x="91" y="94" width="8" height="12" rx="1" fill="#0284c7" />

        
        <g class="dripping-drop" id="dripGroup">
          <path d="M 95 126 C 92 130 90 134 90 137 C 90 140 92 143 95 143 C 98 143 100 140 100 137 C 100 134 98 130 95 126 Z" fill="#451a03"/>
        </g>
      </g>

      
      <g>
        
        <path d="M 95 100 L 192 100" stroke="#cbd5e1" stroke-width="4" stroke-dasharray="3 3"/>
        
        
        <rect x="190" y="90" width="160" height="134" rx="10" fill="#f8fafc" stroke="#cbd5e1" stroke-width="3"/>
        
        
        <g clip-path="url(#tankInnerClip)">
          <rect id="oilLevel" class="oil-fill-rect" x="192" y="95" width="156" height="125" fill="url(#oilGrad)"/>
          
          <line x1="192" y1="95" x2="348" y2="95" stroke="#78350f" stroke-width="2" opacity="0.6"/>
        </g>

        
        <rect x="192" y="92" width="156" height="130" rx="8" fill="url(#tankSheen)" pointer-events="none"/>
        
        
        <line x1="196" y1="110" x2="204" y2="110" stroke="#94a3b8" stroke-width="2"/>
        <line x1="196" y1="140" x2="208" y2="140" stroke="#94a3b8" stroke-width="2"/>
        <line x1="196" y1="170" x2="204" y2="170" stroke="#94a3b8" stroke-width="2"/>
        <line x1="196" y1="200" x2="208" y2="200" stroke="#94a3b8" stroke-width="2"/>

        
        <text x="270" y="246" text-anchor="middle" font-size="13" font-weight="700" fill="#64748b">Earth's Reserves</text>
      </g>

      
      <g>
        <text x="445" y="42" text-anchor="middle" class="label-title">Consumption Rate</text>
        <text x="445" y="62" text-anchor="middle" class="label-rate rate-out">~100M Barrels / Day</text>

        
        <path d="M 350 195 L 420 195 L 420 180" stroke="#64748b" stroke-width="24" stroke-linecap="square" stroke-linejoin="round"/>
        <rect x="408" y="166" width="24" height="12" rx="3" fill="#dc2626" />
        <circle cx="420" cy="160" r="10" fill="#b91c1c"/>

        
        <path class="hose-stream" d="M 432 195 L 515 195" stroke="#1c1917" stroke-width="20" stroke-linecap="round"/>
        <path class="hose-stream" d="M 432 195 L 515 195" stroke="#78350f" stroke-width="6" stroke-linecap="round"/>

        
        <path d="M 460 195 L 475 195 M 485 195 L 500 195" stroke="#fef08a" stroke-width="3" stroke-linecap="round"/>
      </g>

      
      <path d="M 175 60 C 230 75 310 75 365 60" stroke="#cbd5e1" stroke-width="2" stroke-dasharray="4 4" fill="none"/>
      <polygon points="368,60 358,54 360,63" fill="#94a3b8"/>
    </svg>

    <button id="resetBtn" class="btn-replay" onclick="restartAnimation()">
      <span>↺</span> Restart Flow
    </button>
  </div>

  <script>
    function restartAnimation() {
      const oil = document.getElementById('oilLevel');
      const drip = document.getElementById('dripGroup');
      
      oil.style.animation = 'none';
      drip.style.animation = 'none';
      
      void oil.offsetWidth; // Trigger DOM reflow
      void drip.offsetWidth;
      
      oil.style.animation = 'drainLevel 6s infinite ease-in-out';
      drip.style.animation = 'slowDrip 4s infinite cubic-bezier(0.4, 0, 0.2, 1)';
    }
  </script>
</body>
</html>

Crude Oil as a Finite Resource and Hydrocarbon Mixture

<!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;
      user-select: none;
      -webkit-user-select: none;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: transparent;
      color: #1e293b;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      min-height: 100%;
    }

    /* Key / Legend Bar */
    .legend-bar {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 999px;
      padding: 6px 16px;
      font-size: 13px;
      font-weight: 600;
    }

    .legend-item {
      display: flex;
      align-items: center;
      gap: 6px;
      color: #475569;
    }

    .legend-dot {
      width: 16px;
      height: 16px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 10px;
      font-weight: 700;
    }

    .dot-c {
      background: radial-gradient(circle at 30% 30%, #475569, #0f172a);
      color: #ffffff;
      box-shadow: 0 1px 3px rgba(0,0,0,0.2);
    }

    .dot-h {
      background: radial-gradient(circle at 30% 30%, #ffffff, #cbd5e1);
      border: 1px solid #94a3b8;
      color: #1e293b;
    }

    .dot-o {
      background: radial-gradient(circle at 30% 30%, #f87171, #dc2626);
      color: #ffffff;
      box-shadow: 0 1px 3px rgba(220,38,38,0.3);
    }

    /* Main Grid Layout */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      flex: 1;
    }

    @media (max-width: 520px) {
      .comparison-grid {
        grid-template-columns: 1fr;
      }
    }

    /* Column Cards */
    .column {
      display: flex;
      flex-direction: column;
      gap: 10px;
      padding: 12px;
      border-radius: 12px;
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
    }

    .col-hydrocarbon {
      border-color: #bbf7d0;
      background: linear-gradient(180deg, #f0fdf4 0%, #ffffff 28%);
    }

    .col-non-hydrocarbon {
      border-color: #fecaca;
      background: linear-gradient(180deg, #fef2f2 0%, #ffffff 28%);
    }

    /* Column Headers */
    .col-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      padding-bottom: 6px;
      border-bottom: 1px dashed #e2e8f0;
    }

    .col-title {
      font-size: 14px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      font-size: 12px;
      font-weight: 800;
      color: #ffffff;
    }

    .badge-success {
      background: #16a34a;
    }

    .badge-danger {
      background: #dc2626;
    }

    .col-tag {
      font-size: 11px;
      font-weight: 600;
      padding: 2px 8px;
      border-radius: 999px;
      letter-spacing: 0.2px;
    }

    .tag-green {
      background: #dcfce7;
      color: #15803d;
      border: 1px solid #86efac;
    }

    .tag-red {
      background: #fee2e2;
      color: #b91c1c;
      border: 1px solid #fca5a5;
    }

    /* Molecule Items */
    .molecule-row {
      display: flex;
      flex-direction: column;
      gap: 6px;
      background: #f8fafc;
      border-radius: 8px;
      padding: 8px 10px;
      border: 1px solid #f1f5f9;
      position: relative;
    }

    .molecule-info {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .molecule-name {
      font-size: 13px;
      font-weight: 700;
      color: #1e293b;
      display: flex;
      align-items: baseline;
      gap: 5px;
    }

    .molecule-formula {
      font-family: 'Cambria Math', 'Times New Roman', serif;
      font-size: 14px;
      color: #475569;
      font-weight: 600;
    }

    .status-chip {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 4px;
    }

    .chip-valid {
      background: #dcfce7;
      color: #16a34a;
    }

    .chip-invalid {
      background: #fee2e2;
      color: #dc2626;
    }

    /* SVG Containers */
    .svg-container {
      width: 100%;
      height: 90px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    svg {
      width: 100%;
      height: 100%;
      max-height: 90px;
    }

    /* SVG Atom Styling & Hover Interaction */
    .atom {
      cursor: pointer;
      transition: filter 0.15s ease;
    }

    .atom:hover {
      filter: brightness(1.15) drop-shadow(0 0 4px rgba(0,0,0,0.3));
    }

    .atom text {
      pointer-events: none;
      font-family: system-ui, sans-serif;
      font-weight: 700;
      font-size: 11px;
      text-anchor: middle;
      dominant-baseline: central;
    }

    .bond {
      stroke: #64748b;
      stroke-width: 3.5;
      stroke-linecap: round;
    }

    .callout-box {
      font-size: 10px;
      font-weight: 700;
      fill: #dc2626;
    }

    /* Interactive Inspector Footer */
    .inspector-bar {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 6px 12px;
      font-size: 12px;
      color: #334155;
      min-height: 32px;
    }

    .inspector-bar strong {
      color: #0f172a;
    }
  </style>
</head>
<body>

  
  <div class="legend-bar">
    <span style="color:#64748b; font-size:12px;">Atoms:</span>
    <div class="legend-item"><span class="legend-dot dot-c">C</span> Carbon</div>
    <div class="legend-item"><span class="legend-dot dot-h">H</span> Hydrogen</div>
    <div class="legend-item"><span class="legend-dot dot-o">O</span> Oxygen</div>
  </div>

  
  <div class="comparison-grid">

    
    <div class="column col-hydrocarbon">
      <div class="col-header">
        <div class="col-title">
          <span class="badge badge-success">✓</span>
          Hydrocarbons
        </div>
        <span class="col-tag tag-green">ONLY C + H</span>
      </div>

      
      <div class="molecule-row">
        <div class="molecule-info">
          <div class="molecule-name">Methane <span class="molecule-formula">CH₄</span></div>
          <span class="status-chip chip-valid">✓ Hydrocarbon</span>
        </div>
        <div class="svg-container">
          <svg viewBox="0 0 200 90">
            <defs>
              <radialGradient id="grad-c" cx="35%" cy="35%" r="65%">
                <stop offset="0%" stop-color="#475569"/>
                <stop offset="100%" stop-color="#0f172a"/>
              </radialGradient>
              <radialGradient id="grad-h" cx="35%" cy="35%" r="65%">
                <stop offset="0%" stop-color="#ffffff"/>
                <stop offset="100%" stop-color="#cbd5e1"/>
              </radialGradient>
              <radialGradient id="grad-o" cx="35%" cy="35%" r="65%">
                <stop offset="0%" stop-color="#f87171"/>
                <stop offset="100%" stop-color="#dc2626"/>
              </radialGradient>
            </defs>

            
            <line x1="100" y1="45" x2="100" y2="18" class="bond" />
            <line x1="100" y1="45" x2="100" y2="72" class="bond" />
            <line x1="100" y1="45" x2="62" y2="45" class="bond" />
            <line x1="100" y1="45" x2="138" y2="45" class="bond" />

            
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="100" cy="18" r="11" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="100" y="18" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="100" cy="72" r="11" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="100" y="72" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="62" cy="45" r="11" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="62" y="45" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="138" cy="45" r="11" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="138" y="45" fill="#1e293b">H</text></g>

            
            <g class="atom" data-atom="Carbon (C)" data-desc="Forms 4 covalent bonds with H"><circle cx="100" cy="45" r="14" fill="url(#grad-c)"/><text x="100" y="45" fill="#ffffff">C</text></g>
          </svg>
        </div>
      </div>

      
      <div class="molecule-row">
        <div class="molecule-info">
          <div class="molecule-name">Ethane <span class="molecule-formula">C₂H₆</span></div>
          <span class="status-chip chip-valid">✓ Hydrocarbon</span>
        </div>
        <div class="svg-container">
          <svg viewBox="0 0 200 90">
            
            <line x1="82" y1="45" x2="118" y2="45" class="bond" />
            
            <line x1="82" y1="45" x2="82" y2="18" class="bond" />
            <line x1="82" y1="45" x2="82" y2="72" class="bond" />
            <line x1="82" y1="45" x2="50" y2="45" class="bond" />
            
            <line x1="118" y1="45" x2="118" y2="18" class="bond" />
            <line x1="118" y1="45" x2="118" y2="72" class="bond" />
            <line x1="118" y1="45" x2="150" y2="45" class="bond" />

            
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="82" cy="18" r="10" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="82" y="18" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="82" cy="72" r="10" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="82" y="72" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="50" cy="45" r="10" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="50" y="45" fill="#1e293b">H</text></g>

            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="118" cy="18" r="10" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="118" y="18" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="118" cy="72" r="10" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="118" y="72" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="150" cy="45" r="10" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="150" y="45" fill="#1e293b">H</text></g>

            
            <g class="atom" data-atom="Carbon (C)" data-desc="Forms C-C backbone"><circle cx="82" cy="45" r="13" fill="url(#grad-c)"/><text x="82" y="45" fill="#ffffff">C</text></g>
            <g class="atom" data-atom="Carbon (C)" data-desc="Forms C-C backbone"><circle cx="118" cy="45" r="13" fill="url(#grad-c)"/><text x="118" y="45" fill="#ffffff">C</text></g>
          </svg>
        </div>
      </div>
    </div>

    
    <div class="column col-non-hydrocarbon">
      <div class="col-header">
        <div class="col-title">
          <span class="badge badge-danger">✗</span>
          NOT Hydrocarbons
        </div>
        <span class="col-tag tag-red">Contains Other Elements</span>
      </div>

      
      <div class="molecule-row">
        <div class="molecule-info">
          <div class="molecule-name">Ethanol <span class="molecule-formula">C₂H₅OH</span></div>
          <span class="status-chip chip-invalid">✗ Not a Hydrocarbon</span>
        </div>
        <div class="svg-container">
          <svg viewBox="0 0 200 90">
            
            <rect x="122" y="4" width="74" height="18" rx="4" fill="#fee2e2" stroke="#f87171" stroke-width="1"/>
            <text x="159" y="14" text-anchor="middle" dominant-baseline="central" font-size="9.5" font-weight="700" fill="#b91c1c">Contains O ✗</text>
            <path d="M 148 23 L 140 32" stroke="#dc2626" stroke-width="1.5" stroke-dasharray="2 2"/>

            
            <line x1="56" y1="48" x2="94" y2="48" class="bond" />
            <line x1="94" y1="48" x2="134" y2="45" class="bond" stroke="#ef4444" stroke-width="4" />
            <line x1="134" y1="45" x2="162" y2="65" class="bond" />

            
            <line x1="56" y1="48" x2="56" y2="20" class="bond" />
            <line x1="56" y1="48" x2="56" y2="76" class="bond" />
            <line x1="56" y1="48" x2="26" y2="48" class="bond" />
            
            <line x1="94" y1="48" x2="94" y2="20" class="bond" />
            <line x1="94" y1="48" x2="94" y2="76" class="bond" />

            
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="56" cy="20" r="9.5" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="56" y="20" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="56" cy="76" r="9.5" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="56" y="76" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="26" cy="48" r="9.5" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="26" y="48" fill="#1e293b">H</text></g>

            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="94" cy="20" r="9.5" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="94" y="20" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Carbon"><circle cx="94" cy="76" r="9.5" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="94" y="76" fill="#1e293b">H</text></g>
            <g class="atom" data-atom="Hydrogen (H)" data-desc="Bonded to Oxygen in -OH group"><circle cx="162" cy="65" r="9.5" fill="url(#grad-h)" stroke="#94a3b8" stroke-width="1.5"/><text x="162" y="65" fill="#1e293b">H</text></g>

            
            <g class="atom" data-atom="Carbon (C)" data-desc="Forms C-C backbone"><circle cx="56" cy="48" r="12" fill="url(#grad-c)"/><text x="56" y="48" fill="#ffffff">C</text></g>
            <g class="atom" data-atom="Carbon (C)" data-desc="Forms C-C backbone"><circle cx="94" cy="48" r="12" fill="url(#grad-c)"/><text x="94" y="48" fill="#ffffff">C</text></g>

            
            <g class="atom" data-atom="Oxygen (O)" data-desc="Intruder atom — makes this NOT a hydrocarbon"><circle cx="134" cy="45" r="13" fill="url(#grad-o)" stroke="#b91c1c" stroke-width="1.5"/><text x="134" y="45" fill="#ffffff">O</text></g>
          </svg>
        </div>
      </div>

      
      <div class="molecule-row">
        <div class="molecule-info">
          <div class="molecule-name">Water <span class="molecule-formula">H₂O</span></div>
          <span class="status-chip chip-invalid">✗ Not a Hydrocarbon</span>
        </div>
        <div class="svg-container">
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            <g class="atom" data-atom="Oxygen (O)" data-desc="Oxygen atom (No Carbon present)"><circle cx="120" cy="36" r="14" fill="url(#grad-o)" stroke="#b91c1c" stroke-width="1.5"/><text x="120" y="36" fill="#ffffff">O</text></g>
          </svg>
        </div>
      </div>

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  </div>

  
  <div class="inspector-bar" id="inspector">
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        const name = atom.getAttribute('data-atom');
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      atom.addEventListener('mouseenter', showInfo);
      atom.addEventListener('click', showInfo);
    });
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</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>
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      font-weight: 600;
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      align-items: center;
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      border-radius: 12px;
      overflow: hidden;
    }

    .scene {
      position: absolute;
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      align-items: center;
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    }
    .scene.active {
      opacity: 1;
      pointer-events: auto;
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    svg {
      width: 100%;
      height: 100%;
      display: block;
    }

    /* Controls */
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      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      margin-top: 8px;
      width: 100%;
      max-width: 360px;
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      transition: background-color 0.2s;
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    .ctrl-btn:active {
      background: #e2e8f0;
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</head>
<body>

  
  <div class="nav-bar">
    <button class="step-btn active" onclick="goToStep(0)">
      <span class="step-num">Step 1</span>
      <span>Ocean (300M yr)</span>
    </button>
    <button class="step-btn" onclick="goToStep(1)">
      <span class="step-num">Step 2</span>
      <span>Heat & Pressure</span>
    </button>
    <button class="step-btn" onclick="goToStep(2)">
      <span class="step-num">Step 3</span>
      <span>Reservoir Today</span>
    </button>
  </div>

  
  <div class="stage-container">
    
    
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    <div class="scene" id="scene-1">
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        <g stroke="#f97316" stroke-width="2.5" fill="none">
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        <text x="180" y="275" font-size="14" font-weight="bold" fill="#fef08a" text-anchor="middle">Deep Earth Heat</text>
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    </div>

    
    <div class="scene" id="scene-2">
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        <rect x="0" y="0" width="360" height="50" fill="#e2e8f0" />
        
        
        <g stroke="#1e2945" stroke-width="2" fill="none">
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        <rect x="0" y="50" width="360" height="90" fill="#94a3b8" />
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        <text x="180" y="218" font-size="14" font-weight="bold" fill="#ffffff" text-anchor="middle">Crude oil in porous rock</text>

        
        <rect x="0" y="250" width="360" height="50" fill="#64748b" />
      </svg>
    </div>

  </div>

  
  <div class="controls">
    <button class="ctrl-btn" onclick="prevStep()">← Prev</button>
    <button class="ctrl-btn" id="playBtn" onclick="togglePlay()">⏸ Pause</button>
    <button class="ctrl-btn" onclick="nextStep()">Next →</button>
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    // Initialize auto-play
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</body>
</html>

UK-GCSE-SCIENCE-CHEM-EC-02

Child standards (2)

Aligned learning resources

Related diagrams