<!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>LCA Stages 1 &amp; 2: Inputs &amp; Outputs</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

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

    .diagram {
      width: 100%;
      max-width: 580px;
      display: grid;
      grid-template-columns: 1fr auto 1.15fr auto 1fr;
      align-items: center;
      gap: 6px;
    }

    .col {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .section-title {
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      text-align: center;
      margin-bottom: 2px;
    }

    /* Tag Types */
    .tag {
      font-size: 12px;
      font-weight: 600;
      padding: 6px 8px;
      border-radius: 6px;
      display: flex;
      align-items: center;
      gap: 6px;
      line-height: 1.2;
    }

    .tag-green {
      background: #ecfdf5;
      border: 1px solid #a7f3d0;
      color: #065f46;
    }

    .tag-energy {
      background: #fef9c3;
      border: 1px solid #fde047;
      color: #854d0e;
    }

    .tag-blue {
      background: #eff6ff;
      border: 1.5px solid #60a5fa;
      color: #1e40af;
      padding: 10px 8px;
      justify-content: center;
      text-align: center;
      box-shadow: 0 2px 4px rgba(37, 99, 235, 0.08);
    }

    .tag-product {
      background: #f0fdf4;
      border: 1.5px solid #22c55e;
      color: #15803d;
      font-weight: 700;
    }

    .tag-red {
      background: #fef2f2;
      border: 1px solid #fecaca;
      color: #991b1b;
    }

    .icon {
      font-size: 14px;
      flex-shrink: 0;
    }

    /* Stages Middle Column */
    .stage-box {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
    }

    .stage-num {
      font-size: 10px;
      font-weight: 800;
      color: #2563eb;
      text-transform: uppercase;
      letter-spacing: 0.04em;
    }

    .stage-name {
      font-size: 13px;
      font-weight: 700;
    }

    /* Connectors & Arrows */
    .flow-arrow {
      display: flex;
      align-items: center;
      justify-content: center;
      color: #94a3b8;
    }

    .flow-arrow svg {
      width: 18px;
      height: 18px;
      fill: none;
      stroke: #3b82f6;
      stroke-width: 2.5;
      stroke-linecap: round;
      stroke-linejoin: round;
      animation: pulseArrow 1.8s infinite ease-in-out;
    }

    .stage-connector {
      display: flex;
      justify-content: center;
      padding: 2px 0;
      color: #3b82f6;
    }

    .stage-connector svg {
      width: 14px;
      height: 14px;
      stroke: #3b82f6;
      stroke-width: 2.5;
      fill: none;
    }

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

    /* Mobile adjustments */
    @media (max-width: 440px) {
      .diagram {
        gap: 4px;
      }
      .tag {
        font-size: 11px;
        padding: 5px 6px;
        gap: 4px;
      }
      .stage-name {
        font-size: 11px;
      }
      .stage-num {
        font-size: 9px;
      }
      .flow-arrow svg {
        width: 14px;
        height: 14px;
      }
    }
  </style>
</head>
<body>

  <div class="diagram">
    
    <div class="col">
      <div class="section-title" style="color: #059669;">Inputs</div>
      <div class="tag tag-green">
        <span class="icon">🛢️</span>
        <span>Crude Oil</span>
      </div>
      <div class="tag tag-green">
        <span class="icon">🌳</span>
        <span>Trees / Water</span>
      </div>
      <div class="tag tag-energy">
        <span class="icon">⚡</span>
        <span>Energy</span>
      </div>
    </div>

    
    <div class="flow-arrow">
      <svg viewBox="0 0 24 24"><path d="M5 12h14M13 5l7 7-7 7"/></svg>
    </div>

    
    <div class="col">
      <div class="section-title" style="color: #2563eb;">LCA Stages</div>
      
      
      <div class="tag tag-blue stage-box">
        <span class="stage-num">Stage 1</span>
        <span class="stage-name">Raw Materials</span>
      </div>

      
      <div class="stage-connector">
        <svg viewBox="0 0 24 24"><path d="M12 4v16M5 13l7 7 7-7"/></svg>
      </div>

      
      <div class="tag tag-blue stage-box">
        <span class="stage-num">Stage 2</span>
        <span class="stage-name">Manufacture</span>
      </div>
    </div>

    
    <div class="flow-arrow">
      <svg viewBox="0 0 24 24"><path d="M5 12h14M13 5l7 7-7 7"/></svg>
    </div>

    
    <div class="col">
      <div class="section-title" style="color: #dc2626;">Outputs</div>
      <div class="tag tag-product">
        <span class="icon">🛍️</span>
        <span>Product</span>
      </div>
      <div class="tag tag-red">
        <span class="icon">💨</span>
        <span>CO₂ Emissions</span>
      </div>
      <div class="tag tag-red">
        <span class="icon">🧪</span>
        <span>Waste &amp; Scrap</span>
      </div>
    </div>
  </div>

</body>
</html>

The Four Stages of a Life Cycle Assessment

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

    /* Nav Tabs */
    .nav-tabs { display: flex; gap: 6px; margin-bottom: 12px; overflow-x: auto; padding-bottom: 2px; }
    .tab-btn {
      flex: 1; min-width: 60px; padding: 6px 4px; font-size: 12px; font-weight: 600;
      background: #f1f5f9; border: 1px solid transparent; border-radius: 6px;
      color: #64748b; cursor: pointer; text-align: center; white-space: nowrap;
    }
    .tab-btn.active { background: #22b7ff; color: #ffffff; }

    /* Side-by-side Columns */
    .lca-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 12px; }
    .col-header {
      text-align: center; padding: 8px; border-radius: 8px; font-weight: 700; font-size: 14px;
      display: flex; align-items: center; justify-content: center; gap: 6px;
    }
    .col-plastic { background: #e0f2fe; color: #0369a1; }
    .col-paper { background: #fef3c7; color: #92400e; }

    /* Stage Cards */
    .stage-row { display: flex; flex-direction: column; gap: 6px; margin-top: 8px; }
    .stage-card {
      background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 8px; padding: 8px;
      transition: all 0.2s ease;
    }
    .stage-card.highlight {
      border-color: #22b7ff; box-shadow: 0 0 0 1px #22b7ff; background: #ffffff;
    }
    .stage-title {
      font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px;
      color: #64748b; margin-bottom: 4px; display: flex; align-items: center; gap: 4px;
    }
    .tag-group { display: flex; flex-wrap: wrap; gap: 4px; }
    .tag {
      font-size: 11px; font-weight: 600; padding: 2px 6px; border-radius: 4px; display: inline-flex; align-items: center; gap: 3px;
    }
    .tag-good { background: #dcfce7; color: #15803d; }
    .tag-bad { background: #fee2e2; color: #b91c1c; }
    .tag-neutral { background: #f1f5f9; color: #475569; }

    /* Summary Bar */
    .summary-box {
      background: #eff6ff; border: 1px solid #bfdbfe; border-radius: 8px; padding: 10px;
      display: flex; align-items: center; justify-content: space-between; gap: 10px;
    }
    .summary-text { font-size: 12px; font-weight: 600; color: #1e3a8a; }
    .summary-visual {
      display: flex; align-items: center; gap: 4px; font-size: 16px; font-weight: 700; color: #0284c7; white-space: nowrap;
    }
    .bag-icon { display: inline-block; }
  </style>
</head>
<body>

  
  <div class="nav-tabs">
    <button class="tab-btn active" onclick="setStage('all')">Overview</button>
    <button class="tab-btn" onclick="setStage('raw')">1. Raw</button>
    <button class="tab-btn" onclick="setStage('mfg')">2. Make</button>
    <button class="tab-btn" onclick="setStage('use')">3. Use</button>
    <button class="tab-btn" onclick="setStage('disp')">4. Dispose</button>
  </div>

  
  <div class="lca-grid">
    
    <div>
      <div class="col-header col-plastic">🛍️ Plastic Bag</div>
      <div class="stage-row">
        <div class="stage-card" id="card-plastic-raw">
          <div class="stage-title">1. Raw Materials</div>
          <div class="tag-group">
            <span class="tag tag-bad">🛢️ Crude Oil</span>
            <span class="tag tag-neutral">⚡ Low extraction energy</span>
          </div>
        </div>
        <div class="stage-card" id="card-plastic-mfg">
          <div class="stage-title">2. Manufacturing</div>
          <div class="tag-group">
            <span class="tag tag-good">⚡ Low energy</span>
            <span class="tag tag-good">💧 Low water</span>
          </div>
        </div>
        <div class="stage-card" id="card-plastic-use">
          <div class="stage-title">3. Usage</div>
          <div class="tag-group">
            <span class="tag tag-good">🔄 Reusable</span>
            <span class="tag tag-good">💪 Strong / Waterproof</span>
          </div>
        </div>
        <div class="stage-card" id="card-plastic-disp">
          <div class="stage-title">4. Disposal</div>
          <div class="tag-group">
            <span class="tag tag-bad">⏳ Non-biodegradable</span>
            <span class="tag tag-bad">🗑️ Landfill space</span>
          </div>
        </div>
      </div>
    </div>

    
    <div>
      <div class="col-header col-paper">📄 Paper Bag</div>
      <div class="stage-row">
        <div class="stage-card" id="card-paper-raw">
          <div class="stage-title">1. Raw Materials</div>
          <div class="tag-group">
            <span class="tag tag-good">🌲 Timber (Renewable)</span>
            <span class="tag tag-bad">🚜 High land & water</span>
          </div>
        </div>
        <div class="stage-card" id="card-paper-mfg">
          <div class="stage-title">2. Manufacturing</div>
          <div class="tag-group">
            <span class="tag tag-bad">⚡ High energy</span>
            <span class="tag tag-bad">🧪 Pulping chemicals</span>
          </div>
        </div>
        <div class="stage-card" id="card-paper-use">
          <div class="stage-title">3. Usage</div>
          <div class="tag-group">
            <span class="tag tag-bad">⚠️ Rarely reused</span>
            <span class="tag tag-bad">🌧️ Rips when wet</span>
          </div>
        </div>
        <div class="stage-card" id="card-paper-disp">
          <div class="stage-title">4. Disposal</div>
          <div class="tag-group">
            <span class="tag tag-good">🌱 Biodegradable</span>
            <span class="tag tag-good">♻️ Easily recycled</span>
          </div>
        </div>
      </div>
    </div>
  </div>

  
  <div class="summary-box">
    <div class="summary-text">
      <strong>Carbon LCA Break-Even:</strong> Paper must be reused 4× to equal 1 plastic bag.
    </div>
    <div class="summary-visual">
      <span>1 🛍️ =</span>
      <span>4 📄</span>
    </div>
  </div>

  <script>
    function setStage(stage) {
      // Update tab buttons
      const buttons = document.querySelectorAll('.tab-btn');
      buttons.forEach(btn => btn.classList.remove('active'));
      event.target.classList.add('active');

      // Update cards highlight
      const stages = ['raw', 'mfg', 'use', 'disp'];
      stages.forEach(s => {
        const plasticCard = document.getElementById('card-plastic-' + s);
        const paperCard = document.getElementById('card-paper-' + s);
        
        if (stage === 'all' || stage === s) {
          plasticCard.classList.toggle('highlight', stage === s);
          paperCard.classList.toggle('highlight', stage === s);
          plasticCard.style.opacity = '1';
          paperCard.style.opacity = '1';
        } else {
          plasticCard.classList.remove('highlight');
          paperCard.classList.remove('highlight');
          plasticCard.style.opacity = '0.35';
          paperCard.style.opacity = '0.35';
        }
      });
    }
  </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;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      background-color: #f8f9fa;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      min-height: 100%;
    }

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

    .title-pill {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #64748b;
    }

    .hint {
      font-size: 12px;
      color: #94a3b8;
      font-weight: 500;
    }

    /* Grid layout for the 4 stages */
    .stages-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 8px;
      position: relative;
      margin-bottom: 8px;
    }

    @media (max-width: 520px) {
      .stages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
      }
    }

    .stage-card {
      background: #ffffff;
      border: 2px solid transparent;
      border-radius: 12px;
      padding: 10px 8px;
      text-align: center;
      cursor: pointer;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
      transition: box-shadow 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      user-select: none;
      position: relative;
    }

    .stage-card:hover, .stage-card.active {
      border-color: #22b7ff;
      box-shadow: 0 4px 14px rgba(34, 183, 255, 0.2);
      transform: translateY(-2px);
    }

    .stage-num {
      width: 20px;
      height: 20px;
      border-radius: 50%;
      background: #e2e8f0;
      color: #475569;
      font-size: 11px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 4px;
      transition: background 0.25s ease, color 0.25s ease;
    }

    .stage-card:hover .stage-num,
    .stage-card.active .stage-num {
      background: #22b7ff;
      color: #ffffff;
    }

    .stage-icon {
      font-size: 24px;
      line-height: 1.1;
      margin-bottom: 4px;
    }

    .stage-title {
      font-size: 13px;
      font-weight: 700;
      line-height: 1.2;
      color: #1e2945;
      margin-bottom: 2px;
    }

    .stage-sub {
      font-size: 11px;
      color: #64748b;
      line-height: 1.2;
    }

    /* Continuous Transport Bar */
    .transport-bar {
      background: #ffffff;
      border-radius: 10px;
      padding: 8px 12px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      margin-bottom: 8px;
      position: relative;
      border-left: 4px solid #22b7ff;
    }

    .transport-label {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 700;
      color: #1e2945;
    }

    .transport-line {
      flex: 1;
      height: 2px;
      background: repeating-linear-gradient(90deg, #22b7ff 0, #22b7ff 6px, transparent 6px, transparent 10px);
      margin: 0 12px;
    }

    .transport-tag {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
    }

    /* Live Data Inspector Panel */
    .detail-panel {
      background: #ffffff;
      border-radius: 12px;
      padding: 10px 14px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .panel-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid #f1f5f9;
      padding-bottom: 6px;
    }

    .panel-stage-name {
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .panel-io-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
    }

    .io-col {
      background: #f8f9fa;
      border-radius: 8px;
      padding: 8px 10px;
    }

    .io-title {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 4px;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .io-in { color: #0284c7; }
    .io-out { color: #d97706; }

    .io-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 4px;
    }

    .io-tag {
      font-size: 11px;
      background: #ffffff;
      padding: 2px 6px;
      border-radius: 4px;
      font-weight: 600;
      color: #334155;
      border: 1px solid #e2e8f0;
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <span class="title-pill">Life Cycle Assessment (LCA)</span>
    <span class="hint">Tap stage to inspect</span>
  </div>

  <div class="stages-grid">
    <div class="stage-card active" data-stage="0">
      <div class="stage-num">1</div>
      <div class="stage-icon">⛏️</div>
      <div class="stage-title">Raw Material</div>
      <div class="stage-sub">Drilling & Mining</div>
    </div>

    <div class="stage-card" data-stage="1">
      <div class="stage-num">2</div>
      <div class="stage-icon">🏭</div>
      <div class="stage-title">Manufacturing</div>
      <div class="stage-sub">Refining & Assembly</div>
    </div>

    <div class="stage-card" data-stage="2">
      <div class="stage-num">3</div>
      <div class="stage-icon">🏠</div>
      <div class="stage-title">Product Use</div>
      <div class="stage-sub">Lifetime Operation</div>
    </div>

    <div class="stage-card" data-stage="3">
      <div class="stage-num">4</div>
      <div class="stage-icon">♻️</div>
      <div class="stage-title">Disposal</div>
      <div class="stage-sub">Landfill, Burn, Recycle</div>
    </div>
  </div>

  <div class="transport-bar">
    <div class="transport-label">
      <span>🚚</span>
      <span>Transport</span>
    </div>
    <div class="transport-line"></div>
    <div class="transport-tag">Occurs between all 4 stages</div>
  </div>

  <div class="detail-panel">
    <div class="panel-header">
      <div class="panel-stage-name" id="stageName">
        <span>⛏️</span>
        <span>Stage 1: Raw Material Extraction</span>
      </div>
    </div>

    <div class="panel-io-grid">
      <div class="io-col">
        <div class="io-title io-in">⬇ Inputs (Taken)</div>
        <div class="io-tags" id="inputsList">
          <span class="io-tag">⚡ Energy</span>
          <span class="io-tag">🛢️ Crude Oil</span>
          <span class="io-tag">🪵 Timber / Ores</span>
        </div>
      </div>
      <div class="io-col">
        <div class="io-title io-out">⬆ Outputs (Released)</div>
        <div class="io-tags" id="outputsList">
          <span class="io-tag">💨 CO₂ & Dust</span>
          <span class="io-tag">🗑️ Mining Waste</span>
        </div>
      </div>
    </div>
  </div>

  <script>
    const stageData = [
      {
        icon: '⛏️',
        title: 'Stage 1: Raw Material Extraction',
        inputs: ['⚡ Fossil Fuels', '🛢️ Crude Oil / Ore', '💧 Water'],
        outputs: ['💨 CO₂ Emissions', '🗑️ Tailings & Spoil', '🌲 Habitat Loss']
      },
      {
        icon: '🏭',
        title: 'Stage 2: Manufacturing & Packaging',
        inputs: ['⚡ High Heat / Power', '🧪 Chemical Feedstocks', '📦 Packaging'],
        outputs: ['💨 Factory Fumes', '🌊 Waste Effluent', '✂️ Offcuts / Scraps']
      },
      {
        icon: '🏠',
        title: 'Stage 3: Product Use & Maintenance',
        inputs: ['⚡ Electricity', '💧 Cleaning Water', '🔧 Replacement Parts'],
        outputs: ['💨 Running Emissions', '🧴 Detergent Runoff', '🌡️ Waste Heat']
      },
      {
        icon: '♻️',
        title: 'Stage 4: End-of-Life Disposal',
        inputs: ['⚡ Incineration Fuel', '🚜 Compactor Energy', '🚛 Sorting Power'],
        outputs: ['💨 Landfill Methane', '🔥 Toxic Ash / Smoke', '♻️ Recycled Stock']
      }
    ];

    const cards = document.querySelectorAll('.stage-card');
    const stageNameEl = document.getElementById('stageName');
    const inputsList = document.getElementById('inputsList');
    const outputsList = document.getElementById('outputsList');

    function showStage(index) {
      cards.forEach((c, idx) => {
        c.classList.toggle('active', idx === index);
      });

      const data = stageData[index];
      stageNameEl.innerHTML = `<span>${data.icon}</span><span>${data.title}</span>`;
      
      inputsList.innerHTML = data.inputs
        .map(item => `<span class="io-tag">${item}</span>`)
        .join('');

      outputsList.innerHTML = data.outputs
        .map(item => `<span class="io-tag">${item}</span>`)
        .join('');
    }

    cards.forEach((card, i) => {
      card.addEventListener('pointerenter', () => showStage(i));
      card.addEventListener('click', () => showStage(i));
    });
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      background: #f8f9fa;
      color: #1e2945;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      padding: 12px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 12px;
      min-height: 100%;
    }
    .tier-row {
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid #e2e8f0;
      padding: 10px 14px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .tier-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      font-size: 15px;
    }
    .tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 3px 8px;
      border-radius: 6px;
      font-size: 13px;
    }
    .tag-reduce { background: #dcfce7; color: #15803d; }
    .tag-reuse  { background: #e0f2fe; color: #0369a1; }
    .tag-recycle{ background: #ffedd5; color: #c2410c; }

    .energy-val {
      font-variant-numeric: tabular-nums;
      font-size: 14px;
      font-weight: 700;
    }

    .flow-track {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      color: #475569;
      flex-wrap: wrap;
    }
    .step {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 3px 8px;
      font-weight: 600;
      white-space: nowrap;
    }
    .arrow {
      color: #94a3b8;
      font-weight: 700;
      font-size: 11px;
    }

    .bar-container {
      width: 100%;
      height: 14px;
      background: #f1f5f9;
      border-radius: 7px;
      overflow: hidden;
      position: relative;
    }
    .bar-fill {
      height: 100%;
      border-radius: 7px;
      transition: width 0.8s ease-out;
    }
    .fill-reduce  { width: 2%;  background: #22c55e; }
    .fill-reuse   { width: 7%;  background: #0ea5e9; }
    .fill-recycle { width: 100%; background: #f97316; }

    .scale-legend {
      display: flex;
      justify-content: space-between;
      font-size: 11px;
      color: #64748b;
      font-weight: 600;
      padding: 0 4px;
    }
  </style>
</head>
<body>

  
  <div class="tier-row">
    <div class="tier-header">
      <span class="tag tag-reduce">1. Reduce 💧</span>
      <span class="energy-val" style="color: #15803d;">0 MJ</span>
    </div>
    <div class="flow-track">
      <span class="step">Existing Cup</span>
      <span class="arrow">→</span>
      <span class="step">Tap Water</span>
    </div>
    <div class="bar-container">
      <div class="bar-fill fill-reduce"></div>
    </div>
  </div>

  
  <div class="tier-row">
    <div class="tier-header">
      <span class="tag tag-reuse">2. Reuse 🔄</span>
      <span class="energy-val" style="color: #0369a1;">~0.5 MJ</span>
    </div>
    <div class="flow-track">
      <span class="step">Return</span>
      <span class="arrow">→</span>
      <span class="step">Wash &amp; Refill</span>
    </div>
    <div class="bar-container">
      <div class="bar-fill fill-reuse"></div>
    </div>
  </div>

  
  <div class="tier-row">
    <div class="tier-header">
      <span class="tag tag-recycle">3. Recycle ♻️</span>
      <span class="energy-val" style="color: #c2410c;">~7.0 MJ</span>
    </div>
    <div class="flow-track">
      <span class="step">Collect</span>
      <span class="arrow">→</span>
      <span class="step">Sort</span>
      <span class="arrow">→</span>
      <span class="step">Melt 🔥</span>
      <span class="arrow">→</span>
      <span class="step">Remold</span>
    </div>
    <div class="bar-container">
      <div class="bar-fill fill-recycle"></div>
    </div>
  </div>

  
  <div class="scale-legend">
    <span>0 MJ (Low Energy)</span>
    <span>Energy per Serving</span>
    <span>7+ MJ (High Energy)</span>
  </div>

</body>
</html>

The Principles of Reduce, Reuse, and Recycle

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; font-family: system-ui, -apple-system, sans-serif; }
    body {
      background: #f8f9fa;
      color: #1e2945;
      width: 100%;
      min-height: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px;
    }

    .diagram {
      width: 100%;
      max-width: 620px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    /* Step Selector */
    .stepper {
      display: flex;
      justify-content: center;
      gap: 8px;
    }
    .step-btn {
      background: #fff;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      cursor: pointer;
      box-shadow: 0 1px 2px rgba(0,0,0,0.05);
      transition: all 0.2s ease;
    }
    .step-btn.active {
      background: #2563eb;
      color: #fff;
      border-color: #2563eb;
    }

    /* Main Display Box */
    .viewport {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      position: relative;
    }

    .svg-container {
      width: 100%;
      height: 160px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    /* Labels & Badges */
    .status-row {
      width: 100%;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
    }
    .info-tile {
      background: #f1f5f9;
      border-radius: 8px;
      padding: 8px 12px;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 600;
    }
    .info-tile span.icon {
      font-size: 20px;
    }

    /* Bottom Flow Sequence */
    .cycle-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      padding: 8px 12px;
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      font-size: 12px;
      font-weight: 600;
    }
    .node {
      display: flex;
      align-items: center;
      gap: 4px;
      opacity: 0.4;
      transition: opacity 0.3s ease, transform 0.3s ease;
    }
    .node.active {
      opacity: 1;
      color: #2563eb;
    }
    .node.active.waste {
      color: #dc2626;
    }
    .arrow {
      color: #94a3b8;
      font-size: 14px;
    }

    /* Monomer Chains Animation Styling */
    .chain {
      transition: all 0.5s ease;
    }
    .cut-line {
      stroke-dasharray: 4;
      animation: dash 1s linear infinite;
    }
    @keyframes dash {
      to { stroke-dashoffset: -8; }
    }
  </style>
</head>
<body>

<div class="diagram">
  
  <div class="stepper">
    <button class="step-btn active" onclick="setStep(0)">1. Virgin PET</button>
    <button class="step-btn" onclick="setStep(1)">2. Mechanical Recycling</button>
    <button class="step-btn" onclick="setStep(2)">3. Downcycled Fiber</button>
  </div>

  
  <div class="viewport">
    <div class="svg-container">
      <svg viewBox="0 0 500 150" id="chemSvg">
        
        <defs>
          <linearGradient id="petGrad" x1="0%" y1="0%" x2="100%" y2="0%">
            <stop offset="0%" stop-color="#0284c7" />
            <stop offset="100%" stop-color="#38bdf8" />
          </linearGradient>
          <linearGradient id="heatGrad" x1="0%" y1="0%" x2="0%" y2="100%">
            <stop offset="0%" stop-color="#ef4444" />
            <stop offset="100%" stop-color="#f97316" />
          </linearGradient>
        </defs>

        
        <g id="scene"></g>
      </svg>
    </div>

    
    <div class="status-row">
      <div class="info-tile">
        <span class="icon" id="productIcon">🧴</span>
        <span id="productLabel">Bottle (Virgin PET)</span>
      </div>
      <div class="info-tile">
        <span class="icon" id="strengthIcon">💪</span>
        <span id="strengthLabel">High Tensile Strength</span>
      </div>
    </div>
  </div>

  
  <div class="cycle-bar">
    <div class="node active" id="node1">🧴 Bottle</div>
    <div class="arrow">→</div>
    <div class="node" id="node2">🔥 Heat / Cut</div>
    <div class="arrow">→</div>
    <div class="node" id="node3">🧶 Carpet / Fiber</div>
    <div class="arrow">→</div>
    <div class="node waste" id="node4">🗑️ Disposal</div>
  </div>
</div>

<script>
  const steps = [
    {
      icon: "🧴",
      product: "Clear Bottle",
      strengthIcon: "💪",
      strength: "High Tensile Strength",
      render: () => `
        
        <g stroke="#0284c7" stroke-width="8" stroke-linecap="round" fill="none">
          <path d="M 30 40 Q 120 15, 250 40 T 470 40" />
          <path d="M 30 75 Q 150 100, 250 75 T 470 75" />
          <path d="M 30 110 Q 120 85, 250 110 T 470 110" />
        </g>
        
        <g fill="#0369a1">
          ${[50, 110, 170, 230, 290, 350, 410, 450].map(x => `
            <circle cx="${x}" cy="${40 + Math.sin(x/30)*8}" r="6" />
            <circle cx="${x}" cy="${75 - Math.sin(x/30)*8}" r="6" />
            <circle cx="${x}" cy="${110 + Math.sin(x/30)*8}" r="6" />
          `).join('')}
        </g>
        <text x="250" y="142" font-size="12" font-weight="bold" fill="#0284c7" text-anchor="middle">Long Continuous Molecular Chains</text>
      `
    },
    {
      icon: "⚙️",
      product: "Heat + Shredding",
      strengthIcon: "✂️",
      strength: "Chain Scission",
      render: () => `
        
        <g stroke="#ef4444" stroke-width="2" class="cut-line">
          <line x1="160" y1="15" x2="160" y2="130" />
          <line x1="330" y1="15" x2="330" y2="130" />
        </g>
        
        <g stroke="#94a3b8" stroke-width="7" stroke-linecap="round" fill="none">
          <path d="M 30 40 Q 90 20, 145 40" />
          <path d="M 175 40 Q 245 55, 315 40" stroke="#f97316" />
          <path d="M 345 40 Q 405 20, 470 40" />

          <path d="M 30 75 Q 90 95, 145 75" stroke="#f97316" />
          <path d="M 175 75 Q 245 60, 315 75" />
          <path d="M 345 75 Q 405 95, 470 75" stroke="#f97316" />

          <path d="M 30 110 Q 90 90, 145 110" />
          <path d="M 175 110 Q 245 125, 315 110" stroke="#f97316" />
          <path d="M 345 110 Q 405 90, 470 110" />
        </g>
        
        <text x="160" y="15" font-size="14" text-anchor="middle">✂️</text>
        <text x="330" y="15" font-size="14" text-anchor="middle">🔥</text>
        <text x="250" y="142" font-size="12" font-weight="bold" fill="#ea580c" text-anchor="middle">Thermal & Mechanical Degradation</text>
      `
    },
    {
      icon: "🧶",
      product: "Recycled Fiber",
      strengthIcon: "📉",
      strength: "Low Strength (Downcycled)",
      render: () => `
        
        <g stroke="#64748b" stroke-width="6" stroke-linecap="round" fill="none">
          <path d="M 40 30 Q 70 15, 110 35" />
          <path d="M 160 50 Q 200 70, 240 45" />
          <path d="M 290 25 Q 330 45, 370 30" />
          <path d="M 400 60 Q 430 40, 465 55" />

          <path d="M 50 85 Q 90 105, 130 80" />
          <path d="M 180 100 Q 220 80, 260 105" />
          <path d="M 310 85 Q 350 65, 390 90" />
          <path d="M 420 115 Q 445 100, 470 110" />

          <path d="M 80 125 Q 120 135, 160 120" />
          <path d="M 220 125 Q 260 135, 300 120" />
        </g>
        
        <g fill="#475569">
          ${[40, 110, 160, 240, 290, 370, 400, 465, 50, 130, 180, 260, 310, 390].map((x, i) => `
            <circle cx="${x}" cy="${30 + (i%5)*22}" r="4" />
          `).join('')}
        </g>
        <text x="250" y="142" font-size="12" font-weight="bold" fill="#dc2626" text-anchor="middle">Short Chain Fragments (Non-Reprocessable)</text>
      `
    }
  ];

  let currentStep = 0;
  let timer;

  function setStep(idx) {
    currentStep = idx;
    const data = steps[idx];

    // Render SVG Scene
    document.getElementById('scene').innerHTML = data.render();

    // Update Text & Icons
    document.getElementById('productIcon').textContent = data.icon;
    document.getElementById('productLabel').textContent = data.product;
    document.getElementById('strengthIcon').textContent = data.strengthIcon;
    document.getElementById('strengthLabel').textContent = data.strength;

    // Update Buttons
    const btns = document.querySelectorAll('.step-btn');
    btns.forEach((btn, i) => btn.classList.toggle('active', i === idx));

    // Update Sequence Bar
    document.getElementById('node1').className = 'node ' + (idx === 0 ? 'active' : '');
    document.getElementById('node2').className = 'node ' + (idx === 1 ? 'active' : '');
    document.getElementById('node3').className = 'node ' + (idx === 2 ? 'active' : '');
    document.getElementById('node4').className = 'node waste ' + (idx === 2 ? 'active' : '');

    // Reset auto-advance timer on interaction
    clearInterval(timer);
    timer = setInterval(() => {
      setStep((currentStep + 1) % steps.length);
    }, 3500);
  }

  // Initialize
  setStep(0);
</script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Waste Hierarchy</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background-color: #f8f9fa;
      color: #1e2945;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      user-select: none;
      -webkit-user-select: none;
    }

    .main-container {
      width: 100%;
      max-width: 440px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    /* Visual Pyramid Section */
    .pyramid-container {
      position: relative;
      width: 100%;
      height: 205px;
    }
    svg {
      width: 100%;
      height: 100%;
      display: block;
      overflow: visible;
    }

    .tier-shape {
      cursor: pointer;
      transition: filter 0.2s ease, opacity 0.2s ease;
      outline: none;
    }
    .tier-shape:hover {
      filter: brightness(1.1);
    }
    .tier-shape.active {
      filter: brightness(1.15) drop-shadow(0 2px 5px rgba(0,0,0,0.3));
    }
    .tier-text {
      font-size: 11.5px;
      font-weight: 700;
      fill: #ffffff;
      pointer-events: none;
      text-anchor: middle;
      dominant-baseline: central;
      letter-spacing: 0.4px;
    }
    .tier-text.dark {
      fill: #1e2945;
    }

    /* Preference Axis */
    .axis-line {
      stroke: #94a3b8;
      stroke-width: 1.5;
      stroke-dasharray: 3 3;
    }
    .axis-label {
      font-size: 8px;
      font-weight: 800;
      letter-spacing: 0.5px;
      text-anchor: middle;
      text-transform: uppercase;
    }
    .label-most {
      fill: #15803d;
    }
    .label-least {
      fill: #b91c1c;
    }

    /* Active Details Card */
    .details-card {
      background: #ffffff;
      border: 1px solid #e6e6e6;
      border-radius: 8px;
      padding: 10px 14px;
      min-height: 94px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 5px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    }

    .card-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .tier-badge {
      font-size: 10.5px;
      font-weight: 800;
      text-transform: uppercase;
      padding: 2px 7px;
      border-radius: 4px;
      color: #ffffff;
      letter-spacing: 0.4px;
      transition: background-color 0.2s ease;
    }
    .rank-label {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
    }

    .card-action {
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      line-height: 1.25;
    }
    .card-impact {
      font-size: 11.5px;
      color: #475569;
      line-height: 1.35;
    }

    /* Stepper Navigation */
    .nav-row {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 12px;
      margin-top: 2px;
    }
    .nav-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      color: #1e2945;
      font-size: 11.5px;
      font-weight: 600;
      padding: 5px 12px;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: background-color 0.15s ease, border-color 0.15s ease;
    }
    .nav-btn:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }
    .dots {
      display: flex;
      gap: 6px;
      align-items: center;
    }
    .dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      transition: background-color 0.2s ease, transform 0.2s ease;
    }
    .dot.active {
      background: #1e2945;
      transform: scale(1.25);
    }

    @media (max-width: 380px) {
      .details-card {
        padding: 8px 10px;
        min-height: 98px;
      }
      .card-action {
        font-size: 12.5px;
      }
      .card-impact {
        font-size: 11px;
      }
      .tier-text {
        font-size: 11px;
      }
    }
  </style>
</head>
<body>

  <div class="main-container">
    
    <div class="pyramid-container">
      <svg viewBox="0 0 380 200" aria-label="Waste Hierarchy Inverted Pyramid Diagram">
        
        
        <text x="44" y="14" class="axis-label label-most">▲ MOST</text>
        <text x="44" y="23" class="axis-label label-most">PREFERRED</text>
        
        
        <polygon points="44,28 40,36 48,36" fill="#15803d" />
        <line x1="44" y1="36" x2="44" y2="164" class="axis-line" />
        <polygon points="44,172 40,164 48,164" fill="#b91c1c" />

        
        <text x="44" y="184" class="axis-label label-least">▼ LEAST</text>
        <text x="44" y="193" class="axis-label label-least">PREFERRED</text>

        
        <polygon id="tier-0" class="tier-shape active" points="92,8 372,8 346,42 118,42" fill="#15803d" />
        <text x="232" y="25" class="tier-text">1. REDUCE</text>

        
        <polygon id="tier-1" class="tier-shape" points="119,45 345,45 319,79 145,79" fill="#22c55e" />
        <text x="232" y="62" class="tier-text">2. REUSE</text>

        
        <polygon id="tier-2" class="tier-shape" points="146,82 318,82 292,116 172,116" fill="#eab308" />
        <text x="232" y="99" class="tier-text dark">3. RECYCLE</text>

        
        <polygon id="tier-3" class="tier-shape" points="173,119 291,119 265,153 199,153" fill="#f97316" />
        <text x="232" y="136" class="tier-text">4. RECOVERY</text>

        
        <polygon id="tier-4" class="tier-shape" points="200,156 264,156 254,190 210,190" fill="#b91c1c" />
        <text x="232" y="173" class="tier-text" style="font-size: 10.5px; letter-spacing: 0.2px;">5. DISPOSAL</text>
      </svg>
    </div>

    
    <div class="details-card" id="infoCard">
      <div class="card-top">
        <span class="tier-badge" id="cardBadge" style="background:#15803d;">Reduce</span>
        <span class="rank-label" id="cardRank">Priority 1 of 5 (Best)</span>
      </div>
      <div class="card-action" id="cardAction">Prevent waste at source before it exists.</div>
      <div class="card-impact" id="cardImpact">Saves maximum raw materials, manufacturing energy, and transport emissions.</div>
    </div>

    
    <div class="nav-row">
      <button class="nav-btn" id="prevBtn" aria-label="Previous Tier">← Prev</button>
      <div class="dots">
        <div class="dot active" data-idx="0" title="1. Reduce"></div>
        <div class="dot" data-idx="1" title="2. Reuse"></div>
        <div class="dot" data-idx="2" title="3. Recycle"></div>
        <div class="dot" data-idx="3" title="4. Recovery"></div>
        <div class="dot" data-idx="4" title="5. Disposal"></div>
      </div>
      <button class="nav-btn" id="nextBtn" aria-label="Next Tier">Next →</button>
    </div>
  </div>

  <script>
    const tiers = [
      {
        name: "Reduce",
        color: "#15803d",
        rank: "Priority 1 of 5 (Most Preferred)",
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        impact: "Zero resource extraction, zero processing energy, and zero carbon emissions."
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        name: "Reuse",
        color: "#22c55e",
        rank: "Priority 2 of 5",
        action: "Use items repeatedly without reprocessing.",
        impact: "Extends product lifespan; avoids new manufacturing and packaging energy."
      },
      {
        name: "Recycle",
        color: "#ca8a04",
        rank: "Priority 3 of 5",
        action: "Reprocess discarded materials into new items.",
        impact: "Saves raw resources, but consumes significant industrial reprocessing energy."
      },
      {
        name: "Recovery",
        color: "#ea580c",
        rank: "Priority 4 of 5",
        action: "Incinerate waste to generate heat & electricity.",
        impact: "Captures usable energy, but destroys raw materials and emits CO₂."
      },
      {
        name: "Disposal",
        color: "#b91c1c",
        rank: "Priority 5 of 5 (Least Preferred)",
        action: "Send untreated waste to landfill sites.",
        impact: "Total resource loss; generates long-term methane emissions and toxic leachate."
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UK-GCSE-SCIENCE-CHEM-CI-01

Child standards (4)

Aligned learning resources

Related diagrams