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

    /* Stage Navigation Tabs */
    .stage-nav {
      display: flex;
      width: 100%;
      max-width: 580px;
      gap: 6px;
      margin-bottom: 10px;
      justify-content: center;
    }

    .stage-tab {
      flex: 1;
      min-width: 0;
      padding: 8px 4px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      cursor: pointer;
      text-align: center;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
    }

    .stage-tab .icon { font-size: 16px; }
    .stage-tab .tab-lbl { font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; }

    .stage-tab.active {
      background: #22b7ff;
      border-color: #0ea5e9;
      color: #ffffff;
      box-shadow: 0 3px 10px rgba(34, 183, 255, 0.35);
    }

    /* Comparison Grid */
    .grid-container {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 8px;
      width: 100%;
      max-width: 580px;
      flex: 1;
    }

    @media (min-width: 520px) {
      .grid-container {
        grid-template-columns: repeat(4, 1fr);
      }
    }

    .animal-card {
      background: #ffffff;
      border-radius: 10px;
      border: 1px solid #e2e8f0;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      justify-content: flex-start;
      position: relative;
      transition: transform 0.25s ease, border-color 0.25s ease;
    }

    .animal-header {
      display: flex;
      flex-direction: column;
      align-items: center;
      margin-bottom: 8px;
      width: 100%;
      border-bottom: 1px solid #f1f5f9;
      padding-bottom: 6px;
    }

    .animal-icon {
      font-size: 24px;
      line-height: 1;
      margin-bottom: 2px;
    }

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

    .animal-group {
      font-size: 10px;
      color: #64748b;
      font-weight: 500;
      background: #f1f5f9;
      padding: 1px 6px;
      border-radius: 12px;
      margin-top: 2px;
    }

    .content-box {
      width: 100%;
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 4px 2px;
      background: #f8fafc;
      border-radius: 6px;
    }

    .stage-icon-big {
      font-size: 22px;
      margin-bottom: 4px;
      height: 26px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .stage-desc {
      font-size: 12px;
      font-weight: 600;
      color: #334155;
      line-height: 1.3;
    }

    .feature-tag {
      margin-top: 4px;
      font-size: 10px;
      font-weight: 600;
      color: #0284c7;
      background: #e0f2fe;
      padding: 2px 6px;
      border-radius: 4px;
    }

    /* Controls Bar */
    .controls {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 580px;
      margin-top: 10px;
      padding: 4px 6px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
    }

    .ctrl-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 5px 10px;
      font-size: 12px;
      font-weight: 600;
      color: #334155;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
    }

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

    .dots-group {
      display: flex;
      gap: 6px;
      align-items: center;
    }

    .dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      transition: background 0.2s, transform 0.2s;
    }

    .dot.active {
      background: #22b7ff;
      transform: scale(1.2);
    }
  </style>
</head>
<body>

  
  <div class="stage-nav" role="tablist">
    <button class="stage-tab active" data-stage="0">
      <span class="icon">🥚</span>
      <span class="tab-lbl">Birth</span>
    </button>
    <button class="stage-tab" data-stage="1">
      <span class="icon">🌱</span>
      <span class="tab-lbl">Growth</span>
    </button>
    <button class="stage-tab" data-stage="2">
      <span class="icon">❤️</span>
      <span class="tab-lbl">Reproduce</span>
    </button>
    <button class="stage-tab" data-stage="3">
      <span class="icon">🍂</span>
      <span class="tab-lbl">Death</span>
    </button>
  </div>

  
  <div class="grid-container">
    
    <div class="animal-card" id="card-dog">
      <div class="animal-header">
        <span class="animal-icon">🐕</span>
        <span class="animal-name">Dog</span>
        <span class="animal-group">Mammal</span>
      </div>
      <div class="content-box">
        <div class="stage-icon-big" id="icon-dog">🍼</div>
        <div class="stage-desc" id="desc-dog">Live birth<br>(puppy)</div>
        <div class="feature-tag" id="tag-dog">No egg</div>
      </div>
    </div>

    
    <div class="animal-card" id="card-robin">
      <div class="animal-header">
        <span class="animal-icon">🪶</span>
        <span class="animal-name">Robin</span>
        <span class="animal-group">Bird</span>
      </div>
      <div class="content-box">
        <div class="stage-icon-big" id="icon-robin">🪺</div>
        <div class="stage-desc" id="desc-robin">Hard shell<br>egg in nest</div>
        <div class="feature-tag" id="tag-robin">Incubated</div>
      </div>
    </div>

    
    <div class="animal-card" id="card-frog">
      <div class="animal-header">
        <span class="animal-icon">🐸</span>
        <span class="animal-name">Frog</span>
        <span class="animal-group">Amphibian</span>
      </div>
      <div class="content-box">
        <div class="stage-icon-big" id="icon-frog">🫧</div>
        <div class="stage-desc" id="desc-frog">Jelly eggs<br>in water</div>
        <div class="feature-tag" id="tag-frog">Water spawn</div>
      </div>
    </div>

    
    <div class="animal-card" id="card-butterfly">
      <div class="animal-header">
        <span class="animal-icon">🦋</span>
        <span class="animal-name">Butterfly</span>
        <span class="animal-group">Insect</span>
      </div>
      <div class="content-box">
        <div class="stage-icon-big" id="icon-butterfly">🍃</div>
        <div class="stage-desc" id="desc-butterfly">Tiny egg<br>on leaf</div>
        <div class="feature-tag" id="tag-butterfly">Host plant</div>
      </div>
    </div>
  </div>

  
  <div class="controls">
    <button class="ctrl-btn" id="playBtn">⏸ Pause</button>
    <div class="dots-group">
      <div class="dot active" data-idx="0"></div>
      <div class="dot" data-idx="1"></div>
      <div class="dot" data-idx="2"></div>
      <div class="dot" data-idx="3"></div>
    </div>
    <button class="ctrl-btn" id="nextBtn">Next ➔</button>
  </div>

  <script>
    const data = [
      // 0: Birth
      {
        dog: { icon: "🍼", desc: "Live birth<br>(puppy)", tag: "No egg" },
        robin: { icon: "🪺", desc: "Hard shell<br>egg in nest", tag: "Incubated" },
        frog: { icon: "🫧", desc: "Jelly eggs<br>in water", tag: "Water spawn" },
        butterfly: { icon: "🍃", desc: "Tiny egg<br>on leaf", tag: "Host plant" }
      },
      // 1: Growth
      {
        dog: { icon: "🐕", desc: "Puppy grows<br>to adult", tag: "Direct growth" },
        robin: { icon: "🐣", desc: "Chick grows<br>& fledges", tag: "Learns flight" },
        frog: { icon: "🐟", desc: "Tadpole grows<br>legs & lungs", tag: "Metamorphosis" },
        butterfly: { icon: "🐛", desc: "Caterpillar<br>→ pupa (chrysalis)", tag: "Complete change" }
      },
      // 2: Reproduction
      {
        dog: { icon: "🐾", desc: "Mates & gives<br>live birth", tag: "Internal" },
        robin: { icon: "🥚", desc: "Mates, builds<br>nest & lays", tag: "Broods eggs" },
        frog: { icon: "💧", desc: "Mates & lays<br>spawn in pond", tag: "External water" },
        butterfly: { icon: "🌸", desc: "Mates & lays<br>on food plant", tag: "Leaf attachment" }
      },
      // 3: Death
      {
        dog: { icon: "⏳", desc: "Natural end<br>(10–13 yrs)", tag: "Long life" },
        robin: { icon: "⏳", desc: "Natural end<br>(1–2 yrs)", tag: "High predation" },
        frog: { icon: "⏳", desc: "Natural end<br>(4–8 yrs)", tag: "Pond cycle" },
        butterfly: { icon: "⏳", desc: "Natural end<br>(2–4 wks)", tag: "Brief adult" }
      }
    ];

    let currentStage = 0;
    let isPlaying = true;
    let timer = null;

    const tabs = document.querySelectorAll('.stage-tab');
    const dots = document.querySelectorAll('.dot');
    const playBtn = document.getElementById('playBtn');
    const nextBtn = document.getElementById('nextBtn');

    function renderStage(idx) {
      currentStage = idx;

      // Update tabs & dots
      tabs.forEach((tab, i) => tab.classList.toggle('active', i === idx));
      dots.forEach((dot, i) => dot.classList.toggle('active', i === idx));

      // Update animal content
      const stageData = data[idx];
      ['dog', 'robin', 'frog', 'butterfly'].forEach(animal => {
        document.getElementById(`icon-${animal}`).innerHTML = stageData[animal].icon;
        document.getElementById(`desc-${animal}`).innerHTML = stageData[animal].desc;
        document.getElementById(`tag-${animal}`).textContent = stageData[animal].tag;
      });
    }

    function nextStage() {
      renderStage((currentStage + 1) % 4);
    }

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

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

    // Tab clicks
    tabs.forEach(tab => {
      tab.addEventListener('click', () => {
        pauseAutoPlay();
        renderStage(parseInt(tab.dataset.stage, 10));
      });
    });

    // Dot clicks
    dots.forEach(dot => {
      dot.addEventListener('click', () => {
        pauseAutoPlay();
        renderStage(parseInt(dot.dataset.idx, 10));
      });
    });

    // Controls
    playBtn.addEventListener('click', () => {
      if (isPlaying) pauseAutoPlay();
      else startAutoPlay();
    });

    nextBtn.addEventListener('click', () => {
      pauseAutoPlay();
      nextStage();
    });

    // Initialize
    renderStage(0);
    startAutoPlay();
  </script>
</body>
</html>

Comparing Life Cycles Across the Animal Kingdom

<!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">
  <title>The Universal Life Cycle</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    
    :root {
      --bg: #f8fafc;
      --border: #e2e8f0;
      --text: #1e2945;
      --c-birth: #22b7ff;
      --c-birth-dark: #0369a1;
      --c-growth: #10b981;
      --c-growth-dark: #047857;
      --c-repro: #f59e0b;
      --c-repro-dark: #92400e;
      --c-death: #6b7280;
      --c-death-dark: #374151;
    }

    body {
      width: 100%;
      min-height: 100vh;
      background: var(--bg);
      color: var(--text);
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 16px;
      user-select: none;
      -webkit-user-select: none;
    }

    .diagram-wrap {
      position: relative;
      width: 100%;
      max-width: 380px;
      aspect-ratio: 1 / 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    svg.cycle-svg {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      overflow: visible;
      pointer-events: none;
    }

    .arrow-path {
      fill: none;
      stroke-width: 3.5;
      stroke-linecap: round;
      stroke-dasharray: 6 6;
      animation: dash 14s linear infinite;
    }

    @keyframes dash {
      to { stroke-dashoffset: -100; }
    }

    /* Stage Nodes */
    .node {
      position: absolute;
      width: 84px;
      height: 84px;
      margin: -42px;
      border-radius: 50%;
      background: #ffffff;
      border: 2.5px solid var(--border);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
      transition: box-shadow 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
      z-index: 10;
      padding: 4px;
      text-align: center;
    }

    .node:hover {
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    }

    .node .icon {
      font-size: 22px;
      line-height: 1;
      margin-bottom: 3px;
    }

    .node .label {
      font-size: 10px;
      font-weight: 700;
      line-height: 1.1;
      letter-spacing: -0.2px;
      max-width: 76px;
      word-break: normal;
    }

    /* Node Positioning & Specific Colors */
    .node-birth  { top: 12%; left: 50%; border-color: rgba(34, 183, 255, 0.4); color: var(--c-birth-dark); }
    .node-growth { top: 50%; left: 88%; border-color: rgba(16, 185, 129, 0.4); color: var(--c-growth-dark); }
    .node-repro  { top: 88%; left: 50%; border-color: rgba(245, 158, 11, 0.5); color: var(--c-repro-dark); }
    .node-death  { top: 50%; left: 12%; border-color: rgba(107, 114, 128, 0.4); color: var(--c-death-dark); }

    /* Active States */
    .node-birth.active  { border-color: var(--c-birth);  background: #f0f9ff; box-shadow: 0 0 0 4px rgba(34, 183, 255, 0.25); }
    .node-growth.active { border-color: var(--c-growth); background: #ecfdf5; box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.25); }
    .node-repro.active  { border-color: var(--c-repro);  background: #fffbeb; box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.3); }
    .node-death.active  { border-color: var(--c-death);  background: #f3f4f6; box-shadow: 0 0 0 4px rgba(107, 114, 128, 0.25); }

    /* Center Hub */
    .center-hub {
      position: absolute;
      top: 50%;
      left: 50%;
      width: 146px;
      height: 146px;
      margin: -73px;
      border-radius: 50%;
      background: #ffffff;
      border: 1.5px solid var(--border);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      padding: 10px 14px;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
      z-index: 5;
    }

    .hub-title {
      font-size: 9px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #64748b;
      margin-bottom: 4px;
    }

    .hub-stage-name {
      font-size: 15px;
      font-weight: 800;
      color: var(--text);
      line-height: 1.15;
      margin-bottom: 3px;
      transition: color 0.3s ease;
    }

    .hub-desc {
      font-size: 11px;
      color: #475569;
      font-weight: 500;
      line-height: 1.25;
    }

    /* Controls */
    .controls {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 14px;
    }

    .ctrl-btn {
      background: #ffffff;
      border: 1px solid var(--border);
      color: var(--text);
      font-size: 12px;
      font-weight: 600;
      padding: 6px 16px;
      border-radius: 20px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      transition: background 0.2s, border-color 0.2s;
    }

    .ctrl-btn:hover {
      background: #f1f5f9;
      border-color: #cbd5e1;
    }

    @media (max-width: 360px) {
      .node {
        width: 76px;
        height: 76px;
        margin: -38px;
      }
      .node .icon {
        font-size: 20px;
      }
      .node .label {
        font-size: 9.5px;
        max-width: 70px;
      }
      .center-hub {
        width: 134px;
        height: 134px;
        margin: -67px;
        padding: 8px 10px;
      }
      .hub-stage-name {
        font-size: 14px;
      }
      .hub-desc {
        font-size: 10px;
      }
    }
  </style>
</head>
<body>

  <div class="diagram-wrap">
    <svg class="cycle-svg" viewBox="0 0 360 360">
      <defs>
        <marker id="arr-birth" markerWidth="6" markerHeight="6" refX="4" refY="3" orient="auto">
          <path d="M0,0 L6,3 L0,6" fill="none" stroke="#22b7ff" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"/>
        </marker>
        <marker id="arr-growth" markerWidth="6" markerHeight="6" refX="4" refY="3" orient="auto">
          <path d="M0,0 L6,3 L0,6" fill="none" stroke="#10b981" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"/>
        </marker>
        <marker id="arr-repro" markerWidth="6" markerHeight="6" refX="4" refY="3" orient="auto">
          <path d="M0,0 L6,3 L0,6" fill="none" stroke="#f59e0b" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"/>
        </marker>
        <marker id="arr-death" markerWidth="6" markerHeight="6" refX="4" refY="3" orient="auto">
          <path d="M0,0 L6,3 L0,6" fill="none" stroke="#6b7280" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"/>
        </marker>
      </defs>

      
      
      <path class="arrow-path" d="M 215 54 A 136 136 0 0 1 306 145" stroke="#22b7ff" marker-end="url(#arr-birth)" />
      
      <path class="arrow-path" d="M 306 215 A 136 136 0 0 1 215 306" stroke="#10b981" marker-end="url(#arr-growth)" />
      
      <path class="arrow-path" d="M 145 306 A 136 136 0 0 1 54 215" stroke="#f59e0b" marker-end="url(#arr-repro)" />
      
      <path class="arrow-path" d="M 54 145 A 136 136 0 0 1 145 54" stroke="#6b7280" marker-end="url(#arr-death)" />
    </svg>

    
    <div class="center-hub">
      <span class="hub-title">The Universal Life Cycle</span>
      <span class="hub-stage-name" id="stageName">1. Birth</span>
      <span class="hub-desc" id="stageDesc">New life begins</span>
    </div>

    
    <div class="node node-birth active" data-index="0" role="button" tabindex="0" aria-label="Stage 1: Birth">
      <span class="icon">🐣</span>
      <span class="label">Birth</span>
    </div>

    <div class="node node-growth" data-index="1" role="button" tabindex="0" aria-label="Stage 2: Growth">
      <span class="icon">🐾</span>
      <span class="label">Growth</span>
    </div>

    <div class="node node-repro" data-index="2" role="button" tabindex="0" aria-label="Stage 3: Reproduction">
      <span class="icon">🦊</span>
      <span class="label">Reproduction</span>
    </div>

    <div class="node node-death" data-index="3" role="button" tabindex="0" aria-label="Stage 4: Death">
      <span class="icon">🍂</span>
      <span class="label">Death</span>
    </div>
  </div>

  
  <div class="controls">
    <button class="ctrl-btn" id="playBtn" aria-label="Toggle autoplay">⏸ Pause</button>
  </div>

  <script>
    const stages = [
      { name: "1. Birth", desc: "New life begins", color: "#0369a1" },
      { name: "2. Growth", desc: "Maturing to adult", color: "#047857" },
      { name: "3. Reproduction", desc: "Producing offspring", color: "#92400e" },
      { name: "4. Death", desc: "Cycle complete", color: "#374151" }
    ];

    const nodes = document.querySelectorAll('.node');
    const stageNameEl = document.getElementById('stageName');
    const stageDescEl = document.getElementById('stageDesc');
    const playBtn = document.getElementById('playBtn');

    let currentIndex = 0;
    let isPlaying = true;
    let timer = null;
    const INTERVAL_MS = 3000; // 3 seconds per stage

    function setStage(index) {
      currentIndex = index;
      nodes.forEach((node, idx) => {
        node.classList.toggle('active', idx === currentIndex);
      });
      const current = stages[currentIndex];
      stageNameEl.textContent = current.name;
      stageNameEl.style.color = current.color;
      stageDescEl.textContent = current.desc;
    }

    function nextStage() {
      setStage((currentIndex + 1) % stages.length);
    }

    function startAutoPlay() {
      if (timer) clearInterval(timer);
      timer = setInterval(nextStage, INTERVAL_MS);
      isPlaying = true;
      playBtn.textContent = '⏸ Pause';
    }

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

    nodes.forEach((node, idx) => {
      node.addEventListener('click', () => {
        setStage(idx);
        pauseAutoPlay();
      });
      node.addEventListener('mouseenter', () => {
        setStage(idx);
      });
      node.addEventListener('keydown', (e) => {
        if (e.key === 'Enter' || e.key === ' ') {
          e.preventDefault();
          setStage(idx);
          pauseAutoPlay();
        }
      });
    });

    playBtn.addEventListener('click', () => {
      if (isPlaying) {
        pauseAutoPlay();
      } else {
        nextStage();
        startAutoPlay();
      }
    });

    startAutoPlay();
  </script>
</body>
</html>

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

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #fdfdfd;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 10px 12px;
      user-select: none;
    }

    .toolbar {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      justify-content: center;
      width: 100%;
      max-width: 540px;
      margin-bottom: 8px;
    }

    .btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 5px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      transition: all 0.2s ease;
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
    }

    .btn:hover {
      background: #e2e8f0;
    }

    .btn.active {
      background: #22b7ff;
      border-color: #0ea5e9;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(34, 183, 255, 0.35);
    }

    .stage {
      position: relative;
      width: 100%;
      max-width: 520px;
      flex-grow: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    /* Interactive highlighting */
    .part {
      transition: opacity 0.3s ease, filter 0.3s ease, transform 0.3s ease;
      cursor: pointer;
    }

    .label-box {
      transition: opacity 0.3s ease, transform 0.3s ease;
      cursor: pointer;
    }

    .dimmed {
      opacity: 0.25;
      filter: grayscale(0.5);
    }

    .focused {
      opacity: 1 !important;
      filter: drop-shadow(0 0 4px rgba(34, 183, 255, 0.8));
    }

    .focused-label rect {
      stroke: #22b7ff;
      stroke-width: 2px;
      fill: #e0f2fe;
    }

    .focused-label text {
      font-weight: 700;
      fill: #0369a1;
    }

    .label-text {
      font-size: 12px;
      font-weight: 600;
      font-family: system-ui, sans-serif;
    }
  </style>
</head>
<body>

  <div class="toolbar" id="toolbar">
    <button class="btn active" data-target="all">All Parts</button>
    <button class="btn" data-target="shoot">Sprout / Shoot</button>
    <button class="btn" data-target="eye">Eye (Bud)</button>
    <button class="btn" data-target="tuber">Tuber</button>
    <button class="btn" data-target="roots">New Roots</button>
  </div>

  <div class="stage">
    <svg viewBox="0 0 460 340" aria-label="Anatomy of a potato tuber">
      <defs>
        
        <linearGradient id="skyGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#fffbeb"/>
          <stop offset="100%" stop-color="#fef3c7"/>
        </linearGradient>

        
        <linearGradient id="soilGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#92623b"/>
          <stop offset="100%" stop-color="#6e4624"/>
        </linearGradient>

        
        <radialGradient id="tuberGrad" cx="40%" cy="40%" r="60%">
          <stop offset="0%" stop-color="#dfad68"/>
          <stop offset="50%" stop-color="#c58e46"/>
          <stop offset="100%" stop-color="#936127"/>
        </radialGradient>

        
        <linearGradient id="stemGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#4ade80"/>
          <stop offset="100%" stop-color="#16a34a"/>
        </linearGradient>

        
        <filter id="shadow" x="-10%" y="-10%" width="120%" height="120%">
          <feDropShadow dx="1" dy="2" stdDeviation="2" flood-color="#000000" flood-opacity="0.12"/>
        </filter>
      </defs>

      
      <rect x="10" y="8" width="440" height="72" rx="8" fill="url(#skyGrad)"/>
      <circle cx="390" cy="30" r="16" fill="#fde047" opacity="0.8"/>
      <circle cx="390" cy="30" r="24" fill="#fef08a" opacity="0.4"/>
      <text x="390" y="66" text-anchor="middle" font-size="11" fill="#b45309" font-weight="600">Sunlight</text>

      
      <rect x="10" y="80" width="440" height="250" rx="8" fill="url(#soilGrad)"/>
      
      
      <line x1="10" y1="80" x2="450" y2="80" stroke="#78350f" stroke-width="3" stroke-dasharray="6,4"/>
      <text x="30" y="74" font-size="11" fill="#475569" font-weight="700">Soil Level</text>

      
      <g fill="#563318" opacity="0.6">
        <circle cx="50" cy="120" r="2.5"/>
        <circle cx="95" cy="240" r="3.5"/>
        <circle cx="70" cy="300" r="2"/>
        <circle cx="380" cy="130" r="3"/>
        <circle cx="410" cy="220" r="2.5"/>
        <circle cx="370" cy="295" r="4"/>
      </g>

      
      <g id="part-tuber" class="part" onclick="selectPart('tuber')">
        
        <ellipse cx="235" cy="215" rx="100" ry="65" fill="url(#tuberGrad)" filter="url(#shadow)"/>
        
        <circle cx="175" cy="205" r="1.5" fill="#663c12" opacity="0.6"/>
        <circle cx="215" cy="245" r="2" fill="#663c12" opacity="0.6"/>
        <circle cx="275" cy="210" r="1.5" fill="#663c12" opacity="0.6"/>
        <circle cx="295" cy="235" r="2" fill="#663c12" opacity="0.6"/>
        <circle cx="250" cy="180" r="1.5" fill="#663c12" opacity="0.6"/>
      </g>

      
      <g id="part-eye" class="part" onclick="selectPart('eye')">
        
        <g transform="translate(160, 225)">
          <path d="M-9,-2 Q0,5 9,-2" stroke="#5a320b" stroke-width="2.5" fill="none" stroke-linecap="round"/>
          <circle cx="0" cy="-2" r="3" fill="#a3e635"/>
        </g>
        
        <g transform="translate(290, 195)">
          <path d="M-9,-2 Q0,5 9,-2" stroke="#5a320b" stroke-width="2.5" fill="none" stroke-linecap="round"/>
          <circle cx="0" cy="-2" r="3" fill="#a3e635"/>
        </g>
        
        <g transform="translate(250, 255)">
          <path d="M-8,-2 Q0,4 8,-2" stroke="#5a320b" stroke-width="2.5" fill="none" stroke-linecap="round"/>
          <circle cx="0" cy="-2" r="2.5" fill="#a3e635"/>
        </g>
      </g>

      
      <g id="part-roots" class="part" onclick="selectPart('roots')">
        <path d="M 215 178 Q 200 205 190 240 Q 185 260 175 275" fill="none" stroke="#f8fafc" stroke-width="2.5" stroke-linecap="round"/>
        <path d="M 190 240 Q 180 255 170 260" fill="none" stroke="#f8fafc" stroke-width="1.8" stroke-linecap="round"/>
        <path d="M 220 182 Q 215 215 220 255 Q 222 280 215 305" fill="none" stroke="#f8fafc" stroke-width="2.5" stroke-linecap="round"/>
        <path d="M 218 240 Q 228 260 235 275" fill="none" stroke="#f8fafc" stroke-width="1.8" stroke-linecap="round"/>
        <path d="M 225 180 Q 240 210 248 245" fill="none" stroke="#f8fafc" stroke-width="2.2" stroke-linecap="round"/>
      </g>

      
      <g id="part-shoot" class="part" onclick="selectPart('shoot')">
        
        <path d="M 218 170 Q 212 120 200 65" fill="none" stroke="url(#stemGrad)" stroke-width="6" stroke-linecap="round"/>
        
        
        <path d="M 210 115 C 180 110 170 95 180 85 C 195 75 210 100 210 115 Z" fill="#22c55e" stroke="#15803d" stroke-width="1.2"/>
        
        
        <path d="M 205 90 C 235 85 245 70 235 60 C 220 50 205 75 205 90 Z" fill="#22c55e" stroke="#15803d" stroke-width="1.2"/>
        
        
        <path d="M 200 65 C 185 45 180 30 195 25 C 208 20 205 50 200 65 Z" fill="#4ade80" stroke="#16a34a" stroke-width="1.2"/>
        <path d="M 200 65 C 215 45 220 30 205 25 C 192 20 195 50 200 65 Z" fill="#4ade80" stroke="#16a34a" stroke-width="1.2"/>
      </g>

      
      
      
      <g id="lbl-shoot" class="label-box" onclick="selectPart('shoot')">
        <line x1="120" y1="42" x2="185" y2="42" stroke="#1e2945" stroke-width="1.5"/>
        <circle cx="185" cy="42" r="3" fill="#16a34a"/>
        <rect x="18" y="27" width="102" height="30" rx="6" fill="#ffffff" stroke="#cbd5e1" stroke-width="1.2" filter="url(#shadow)"/>
        <text x="69" y="47" text-anchor="middle" class="label-text" fill="#16a34a">Sprout / Shoot</text>
      </g>

      
      <g id="lbl-eye" class="label-box" onclick="selectPart('eye')">
        <line x1="330" y1="170" x2="295" y2="192" stroke="#1e2945" stroke-width="1.5"/>
        <circle cx="295" cy="192" r="3" fill="#65a30d"/>
        <rect x="330" y="155" width="86" height="30" rx="6" fill="#ffffff" stroke="#cbd5e1" stroke-width="1.2" filter="url(#shadow)"/>
        <text x="373" y="175" text-anchor="middle" class="label-text" fill="#4d7c0f">Eye (Bud)</text>
      </g>

      
      <g id="lbl-tuber" class="label-box" onclick="selectPart('tuber')">
        <line x1="305" y1="245" x2="330" y2="245" stroke="#1e2945" stroke-width="1.5"/>
        <circle cx="305" cy="245" r="3" fill="#936127"/>
        <rect x="330" y="230" width="120" height="30" rx="6" fill="#ffffff" stroke="#cbd5e1" stroke-width="1.2" filter="url(#shadow)"/>
        <text x="390" y="250" text-anchor="middle" class="label-text" fill="#936127">Tuber (Food)</text>
      </g>

      
      <g id="lbl-roots" class="label-box" onclick="selectPart('roots')">
        <line x1="120" y1="285" x2="180" y2="280" stroke="#1e2945" stroke-width="1.5"/>
        <circle cx="180" cy="280" r="3" fill="#ffffff"/>
        <rect x="34" y="270" width="86" height="30" rx="6" fill="#ffffff" stroke="#cbd5e1" stroke-width="1.2" filter="url(#shadow)"/>
        <text x="77" y="290" text-anchor="middle" class="label-text" fill="#334155">New Roots</text>
      </g>

    </svg>
  </div>

  <script>
    const parts = ['shoot', 'eye', 'tuber', 'roots'];
    const buttons = document.querySelectorAll('.toolbar .btn');

    function selectPart(target) {
      // Update buttons
      buttons.forEach(btn => {
        if (btn.dataset.target === target) {
          btn.classList.add('active');
        } else {
          btn.classList.remove('active');
        }
      });

      // Update SVG highlights
      parts.forEach(p => {
        const partEl = document.getElementById('part-' + p);
        const lblEl = document.getElementById('lbl-' + p);

        if (target === 'all' || target === p) {
          partEl.classList.remove('dimmed');
          lblEl.classList.remove('dimmed');
          if (target === p) {
            partEl.classList.add('focused');
            lblEl.classList.add('focused-label');
          } else {
            partEl.classList.remove('focused');
            lblEl.classList.remove('focused-label');
          }
        } else {
          partEl.classList.add('dimmed');
          partEl.classList.remove('focused');
          lblEl.classList.add('dimmed');
          lblEl.classList.remove('focused-label');
        }
      });
    }

    buttons.forEach(btn => {
      btn.addEventListener('click', () => {
        selectPart(btn.dataset.target);
      });
    });
  </script>
</body>
</html>

Asexual Plant Reproduction: Runners, Tubers, and Bulbs

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Daffodil Bulb Cross-Section</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      width: 100%;
      min-height: 100%;
      background: #fafaf9;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 10px 8px;
    }
    .diagram-wrap {
      width: 100%;
      max-width: 580px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }
    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
      user-select: none;
    }
    .label-text {
      font-size: 11px;
      font-weight: 700;
      fill: #1e293b;
    }
    .label-sub {
      font-size: 9.5px;
      font-weight: 500;
      fill: #64748b;
    }
    .pointer {
      stroke: #94a3b8;
      stroke-width: 1.25;
      stroke-dasharray: 2,2;
      fill: none;
    }
    .pointer-dot {
      fill: #2563eb;
      stroke: #ffffff;
      stroke-width: 1;
    }
    .interactive-part {
      cursor: pointer;
      transition: filter 0.2s ease, opacity 0.2s ease;
    }
    .interactive-part:hover {
      filter: drop-shadow(0 0 5px rgba(37, 99, 235, 0.5));
    }
    .interactive-part.active {
      filter: drop-shadow(0 0 6px rgba(37, 99, 235, 0.75));
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 5px;
      justify-content: center;
      width: 100%;
    }
    .tag-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 5px 9px;
      font-size: 11px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      user-select: none;
      transition: background 0.15s, border-color 0.15s, color 0.15s;
    }
    .tag-btn:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
      color: #1e293b;
    }
    .tag-btn.active {
      background: #eff6ff;
      border-color: #3b82f6;
      color: #1d4ed8;
      box-shadow: 0 0 0 1px #3b82f6;
    }
    .info-box {
      width: 100%;
      min-height: 42px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 8px 12px;
      font-size: 11.5px;
      line-height: 1.4;
      color: #334155;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
    }
    .info-box strong {
      color: #0f172a;
      margin-right: 4px;
    }
    @media (max-width: 400px) {
      .label-text {
        font-size: 10.5px;
      }
      .label-sub {
        font-size: 9px;
      }
      .tag-btn {
        font-size: 10px;
        padding: 4px 7px;
      }
    }
  </style>
</head>
<body>

  <div class="diagram-wrap">
    
    <svg viewBox="-95 0 645 375" aria-label="Cross-section diagram of a daffodil bulb showing asexual reproduction">
      <defs>
        
        <linearGradient id="soilGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#e7ded5" stop-opacity="0.5"/>
          <stop offset="100%" stop-color="#d4c5b5" stop-opacity="0.75"/>
        </linearGradient>
        
        
        <linearGradient id="leafGrad1" x1="0" y1="0" x2="1" y2="0">
          <stop offset="0%" stop-color="#fdfbf7"/>
          <stop offset="50%" stop-color="#ffffff"/>
          <stop offset="100%" stop-color="#f5efe6"/>
        </linearGradient>
        
        
        <linearGradient id="shootGrad" x1="0" y1="1" x2="0" y2="0">
          <stop offset="0%" stop-color="#bef264"/>
          <stop offset="60%" stop-color="#84cc16"/>
          <stop offset="100%" stop-color="#65a30d"/>
        </linearGradient>
      </defs>

      
      <rect x="-85" y="32" width="625" height="335" rx="8" fill="url(#soilGrad)" />
      <line x1="-85" y1="32" x2="540" y2="32" stroke="#8c7a6b" stroke-width="2" stroke-dasharray="6,4" />
      <text x="-75" y="24" font-size="10" font-weight="700" fill="#786657" letter-spacing="0.6">SOIL SURFACE</text>

      
      <g id="part-roots" class="interactive-part">
        
        <path d="M190 280 Q180 305 170 340 M200 282 Q195 315 190 355 M215 284 Q215 320 220 360 M230 284 Q240 315 245 355 M245 282 Q255 310 268 345 M225 284 Q228 325 232 350 M195 282 Q175 310 160 335" 
              stroke="#e2d4c0" stroke-width="3.5" stroke-linecap="round" fill="none" />
        <path d="M190 280 Q180 305 170 340 M200 282 Q195 315 190 355 M215 284 Q215 320 220 360 M230 284 Q240 315 245 355 M245 282 Q255 310 268 345 M225 284 Q228 325 232 350 M195 282 Q175 310 160 335" 
              stroke="#9a7b56" stroke-width="1.8" stroke-linecap="round" fill="none" />
        
        
        <path d="M295 272 Q295 300 300 330 M305 273 Q315 300 325 335 M290 270 Q285 295 282 320" 
              stroke="#9a7b56" stroke-width="1.5" stroke-linecap="round" fill="none" />
      </g>

      
      <g id="part-daughter" class="interactive-part">
        
        <path d="M275 275 C270 230 290 185 310 170 C330 185 350 230 340 275 Z" fill="#8d5b36" stroke="#5c3a21" stroke-width="1.5" />
        
        <path d="M278 273 C275 235 293 192 310 178 C327 192 344 235 337 273 Z" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.2" />
        <path d="M285 272 C283 240 297 205 310 193 C323 205 335 240 331 272 Z" fill="#f1f5f9" stroke="#cbd5e1" stroke-width="1.2" />
        <path d="M293 271 C292 248 301 220 310 210 C319 220 326 248 324 271 Z" fill="#ffffff" stroke="#cbd5e1" stroke-width="1.2" />
        
        <ellipse cx="308" cy="273" rx="20" ry="4.5" fill="#d97706" stroke="#92400e" stroke-width="1" />
        
        <path d="M307 270 C305 245 306 225 310 212 C314 225 315 245 313 270 Z" fill="#84cc16" stroke="#4d7c0f" stroke-width="1" />
      </g>

      
      
      <g id="part-skin" class="interactive-part">
        <path d="M140 270 C130 200 175 110 220 80 C265 110 308 200 298 270 Z" 
              fill="#965a38" stroke="#5c3317" stroke-width="2" />
        
        <path d="M148 260 C140 205 178 125 218 86" stroke="#783e1b" stroke-width="1" fill="none" />
        <path d="M290 260 C298 205 262 125 222 86" stroke="#783e1b" stroke-width="1" fill="none" />
      </g>

      
      <g id="part-leaves" class="interactive-part">
        
        <path d="M147 270 C139 205 180 120 220 92 C260 120 299 205 291 270 Z" 
              fill="url(#leafGrad1)" stroke="#cbd5e1" stroke-width="1.5" />
        
        <path d="M158 271 C151 212 186 135 220 110 C254 135 287 212 280 271 Z" 
              fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5" />
        
        <path d="M170 272 C165 220 193 152 220 130 C247 152 273 220 268 272 Z" 
              fill="#ffffff" stroke="#cbd5e1" stroke-width="1.5" />
        
        <path d="M183 273 C180 228 201 170 220 152 C239 170 258 228 255 273 Z" 
              fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5" />
      </g>

      
      <g id="part-plate" class="interactive-part">
        <ellipse cx="218" cy="276" rx="42" ry="8" fill="#d97706" stroke="#92400e" stroke-width="1.8" />
        <ellipse cx="218" cy="276" rx="34" ry="4.5" fill="#f59e0b" />
      </g>

      
      <g id="part-shoot" class="interactive-part">
        
        <path d="M197 274 C195 230 205 165 220 50 C235 165 243 230 239 274 Z" 
              fill="url(#shootGrad)" stroke="#4d7c0f" stroke-width="1.5" />
        
        <ellipse cx="220" cy="140" rx="9" ry="18" fill="#facc15" stroke="#ca8a04" stroke-width="1.2" />
        <path d="M220 122 Q224 138 220 158" stroke="#a16207" stroke-width="1" fill="none" />
        
        <path d="M214 75 Q220 40 220 30 Q220 40 226 75 Z" fill="#65a30d" />
      </g>

      
      
      
      <g id="lbl-shoot">
        <polyline points="214,130 115,108 95,108" class="pointer" />
        <circle cx="214" cy="130" r="3" class="pointer-dot" />
        <text x="88" y="104" text-anchor="end" class="label-text">Main Shoot / Flower Bud</text>
        <text x="88" y="117" text-anchor="end" class="label-sub">grows into leaves & flower</text>
      </g>

      
      <g id="lbl-skin">
        <polyline points="144,175 100,165" class="pointer" />
        <circle cx="144" cy="175" r="3" class="pointer-dot" />
        <text x="93" y="161" text-anchor="end" class="label-text">Brown Papery Skin</text>
        <text x="93" y="174" text-anchor="end" class="label-sub">dry protective tunic</text>
      </g>

      
      <g id="lbl-leaves">
        <polyline points="168,225 100,218" class="pointer" />
        <circle cx="168" cy="225" r="3" class="pointer-dot" />
        <text x="93" y="214" text-anchor="end" class="label-text">Fleshy Storage Leaves</text>
        <text x="93" y="227" text-anchor="end" class="label-sub">stores food / starch rings</text>
      </g>

      
      <g id="lbl-plate">
        <polyline points="178,276 95,276" class="pointer" />
        <circle cx="178" cy="276" r="3" class="pointer-dot" />
        <text x="88" y="272" text-anchor="end" class="label-text">Basal Plate (Short Stem)</text>
        <text x="88" y="285" text-anchor="end" class="label-sub">modified compact stem</text>
      </g>

      
      <g id="lbl-roots">
        <polyline points="190,328 115,335" class="pointer" />
        <circle cx="190" cy="328" r="3" class="pointer-dot" />
        <text x="108" y="339" text-anchor="end" class="label-text">Roots</text>
        <text x="108" y="352" text-anchor="end" class="label-sub">absorb water & minerals</text>
      </g>

      
      <g id="lbl-daughter">
        <polyline points="330,225 385,225" class="pointer" />
        <circle cx="330" cy="225" r="3" class="pointer-dot" />
        <text x="393" y="221" class="label-text">Daughter Bulb (Clone)</text>
        <text x="393" y="234" class="label-sub">asexual bud produces clone</text>
      </g>
    </svg>

    
    <div id="infoBox" class="info-box">
      <span>Click any button or bulb part above to inspect its anatomical function.</span>
    </div>

    
    <div class="btn-group" role="tablist" aria-label="Bulb anatomy parts">
      <button class="tag-btn" data-target="part-shoot">Flower Bud</button>
      <button class="tag-btn" data-target="part-leaves">Storage Leaves</button>
      <button class="tag-btn" data-target="part-daughter">Daughter Bulb</button>
      <button class="tag-btn" data-target="part-plate">Basal Plate</button>
      <button class="tag-btn" data-target="part-skin">Papery Skin</button>
      <button class="tag-btn" data-target="part-roots">Roots</button>
    </div>
  </div>

  <script>
    const descriptions = {
      'part-shoot': '<strong>Main Shoot & Flower Bud:</strong> The central growing tip and embryonic flower that will emerge above ground in spring.',
      'part-leaves': '<strong>Fleshy Storage Leaves:</strong> Thickened, concentric white scale leaves packed with stored starch to nourish the growing shoot.',
      'part-daughter': '<strong>Daughter Bulb (Clone):</strong> An offset budding bulb formed asexually from a lateral bud, genetically identical to the parent.',
      'part-plate': '<strong>Basal Plate (Short Stem):</strong> A flattened, highly condensed underground stem connecting the storage leaves to the roots.',
      'part-skin': '<strong>Brown Papery Skin (Tunic):</strong> Dry outer dead leaves that protect the bulb from drying out, infection, and physical injury.',
      'part-roots': '<strong>Roots:</strong> Adventitious roots growing from the basal plate that anchor the bulb and absorb water and soil nutrients.'
    };

    const defaultInfo = '<span>Click any button or bulb part above to inspect its anatomical function.</span>';
    const buttons = document.querySelectorAll('.tag-btn');
    const parts = document.querySelectorAll('.interactive-part');
    const infoBox = document.getElementById('infoBox');

    function setActive(targetId) {
      buttons.forEach(btn => {
        btn.classList.toggle('active', btn.dataset.target === targetId);
      });
      parts.forEach(part => {
        if (part.id === targetId) {
          part.classList.add('active');
          part.style.opacity = '1';
        } else if (targetId) {
          part.classList.remove('active');
          part.style.opacity = '0.35';
        } else {
          part.classList.remove('active');
          part.style.opacity = '1';
        }
      });

      if (targetId && descriptions[targetId]) {
        infoBox.innerHTML = descriptions[targetId];
      } else {
        infoBox.innerHTML = defaultInfo;
      }
    }

    buttons.forEach(btn => {
      btn.addEventListener('click', () => {
        const currentActive = btn.classList.contains('active');
        setActive(currentActive ? null : btn.dataset.target);
      });
    });

    parts.forEach(part => {
      part.addEventListener('click', () => {
        const isCurrent = part.classList.contains('active');
        setActive(isCurrent ? null : part.id);
      });
    });
  </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: #0f172a;
      padding: 6px;
    }
    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
    }
    @media (max-width: 500px) {
      .grid {
        grid-template-columns: 1fr;
        gap: 10px;
      }
    }
    .panel {
      border-radius: 12px;
      padding: 10px 10px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 250px;
    }
    .panel-sexual {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
    }
    .panel-asexual {
      background: #f0fdf4;
      border: 1px solid #bbf7d0;
    }
    .panel-title {
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 4px;
      text-align: center;
      letter-spacing: -0.01em;
    }
    .title-sexual { color: #3730a3; }
    .title-asexual { color: #14532d; }

    .visual-stage {
      width: 100%;
      height: 175px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    /* Badges */
    .badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 5px;
      font-size: 11.5px;
      font-weight: 700;
      padding: 5px 12px;
      border-radius: 9999px;
      margin-top: 6px;
      text-align: center;
      transition: box-shadow 0.6s ease, background-color 0.6s ease;
    }
    .badge-sexual {
      background: #e2e8f0;
      color: #1e293b;
      border: 1px solid #cbd5e1;
    }
    .badge-asexual {
      background: #dcfce7;
      color: #14532d;
      border: 1px solid #86efac;
    }
    .badge.active {
      box-shadow: 0 0 0 2px currentColor;
    }

    /* Controls */
    .controls {
      display: flex;
      justify-content: center;
      margin-top: 10px;
      margin-bottom: 2px;
    }
    .btn-toggle {
      background: #0f172a;
      color: #ffffff;
      border: none;
      border-radius: 20px;
      padding: 7px 16px;
      font-size: 12px;
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: opacity 0.3s ease, background-color 0.3s ease;
    }
    .btn-toggle:hover {
      background: #1e293b;
      opacity: 0.95;
    }

    /* SVG Styling */
    svg text {
      font-family: system-ui, sans-serif;
      user-select: none;
    }
    .glow-ring {
      opacity: 0;
      transition: opacity 0.6s ease;
    }
    .glow-active .glow-ring {
      opacity: 1;
    }
    .flow-line {
      stroke-dasharray: 4 3;
      animation: dashFlow 3s linear infinite;
    }
    @keyframes dashFlow {
      to {
        stroke-dashoffset: -28;
      }
    }
    .runner-pulse {
      stroke-dasharray: 5 4;
      animation: dashFlow 2.5s linear infinite;
    }
    .dna-tag {
      opacity: 0.85;
      font-weight: 600;
      transition: opacity 0.6s ease, font-weight 0.6s ease;
    }
    .glow-active .dna-tag {
      opacity: 1;
      font-weight: 800;
    }
    .trait-highlight {
      opacity: 0;
      transition: opacity 0.6s ease;
    }
    .glow-active .trait-highlight {
      opacity: 1;
    }
  </style>
</head>
<body>

  <div class="grid" id="diagramArea">
    
    <div class="panel panel-sexual">
      <div class="panel-title title-sexual">Sexual Reproduction (Seeds)</div>
      
      <div class="visual-stage">
        <svg viewBox="0 0 200 170" width="100%" height="100%" style="overflow: visible;">
          <defs>
            
            <g id="p1-flower">
              <circle cx="0" cy="0" r="10" fill="#e11d48"/>
              <circle cx="-7" cy="-7" r="6" fill="#f43f5e"/>
              <circle cx="7" cy="-7" r="6" fill="#f43f5e"/>
              <circle cx="-7" cy="7" r="6" fill="#f43f5e"/>
              <circle cx="7" cy="7" r="6" fill="#f43f5e"/>
              <circle cx="0" cy="0" r="5" fill="#fde047"/>
            </g>
            
            <g id="p2-flower">
              <rect x="-10" y="-10" width="20" height="20" rx="3" fill="#2563eb" transform="rotate(45)"/>
              <circle cx="0" cy="0" r="7" fill="#3b82f6"/>
              <circle cx="0" cy="0" r="4" fill="#fbbf24"/>
            </g>
            
            <g id="hybrid-flower">
              <circle cx="0" cy="0" r="12" fill="#9333ea"/>
              <rect x="-8" y="-8" width="16" height="16" rx="2" fill="#a855f7" transform="rotate(45)"/>
              <circle cx="-6" cy="0" r="5" fill="#e11d48"/>
              <circle cx="6" cy="0" r="5" fill="#2563eb"/>
              <circle cx="0" cy="0" r="4" fill="#fef08a"/>
            </g>
          </defs>

          
          <g transform="translate(45, 25)">
            <circle class="trait-highlight" cx="0" cy="0" r="16" fill="none" stroke="#e11d48" stroke-width="1.5" stroke-dasharray="3 3"/>
            <use href="#p1-flower"/>
            <text x="0" y="22" font-size="9" font-weight="700" fill="#be123c" text-anchor="middle">Parent 1</text>
            <text x="0" y="32" font-size="8.5" fill="#334155" text-anchor="middle" class="dna-tag">50% DNA (A)</text>
          </g>

          
          <text x="100" y="28" font-size="15" font-weight="700" fill="#475569" text-anchor="middle">+</text>

          
          <g transform="translate(155, 25)">
            <circle class="trait-highlight" cx="0" cy="0" r="16" fill="none" stroke="#2563eb" stroke-width="1.5" stroke-dasharray="3 3"/>
            <use href="#p2-flower"/>
            <text x="0" y="22" font-size="9" font-weight="700" fill="#1d4ed8" text-anchor="middle">Parent 2</text>
            <text x="0" y="32" font-size="8.5" fill="#334155" text-anchor="middle" class="dna-tag">50% DNA (B)</text>
          </g>

          
          <path d="M 45 42 Q 45 66 90 75" fill="none" stroke="#64748b" stroke-width="1.5" class="flow-line"/>
          <path d="M 155 42 Q 155 66 110 75" fill="none" stroke="#64748b" stroke-width="1.5" class="flow-line"/>

          
          <g transform="translate(100, 77)">
            <ellipse cx="0" cy="0" rx="7" ry="5" fill="#713f12" transform="rotate(-15)"/>
            <path d="M-1,-3 Q 4,0 -1,3" stroke="#ca8a04" stroke-width="1" fill="none"/>
            <text x="0" y="11" font-size="8" font-weight="700" fill="#713f12" text-anchor="middle">Fertilised Seed</text>
          </g>

          
          <path d="M 100 92 L 100 110" stroke="#475569" stroke-width="1.5" stroke-linecap="round"/>
          <polygon points="97,109 103,109 100,114" fill="#475569"/>

          
          <g transform="translate(100, 134)">
            <circle class="glow-ring" cx="0" cy="0" r="21" fill="none" stroke="#9333ea" stroke-width="2" stroke-dasharray="3 3"/>
            
            <path d="M 0 10 L 0 20" stroke="#15803d" stroke-width="2" stroke-linecap="round"/>
            <path d="M 0 15 Q -6 11 -8 15" fill="none" stroke="#15803d" stroke-width="1.5"/>
            <path d="M 0 17 Q 6 13 8 17" fill="none" stroke="#15803d" stroke-width="1.5"/>
            <use href="#hybrid-flower"/>
            <text x="0" y="28" font-size="9" font-weight="700" fill="#6b21a8" text-anchor="middle">Hybrid Offspring</text>
          </g>
        </svg>
      </div>

      <div class="badge badge-sexual" id="badgeSex">🔀 Mixed Traits (50% / 50%)</div>
    </div>

    
    <div class="panel panel-asexual">
      <div class="panel-title title-asexual">Asexual Reproduction (Runner Clone)</div>
      
      <div class="visual-stage">
        <svg viewBox="0 0 200 170" width="100%" height="100%" style="overflow: visible;">
          <defs>
            
            <g id="strawberry-plant">
              
              <path d="M 0 0 L 0 -18" stroke="#15803d" stroke-width="2.5" stroke-linecap="round"/>
              <path d="M 0 -10 Q -14 -22 -16 -6 Q -8 0 0 -6" fill="#22c55e" stroke="#14532d" stroke-width="1"/>
              <path d="M 0 -12 Q 14 -24 16 -8 Q 8 -2 0 -8" fill="#22c55e" stroke="#14532d" stroke-width="1"/>
              <path d="M 0 -16 Q 0 -30 -6 -28 Q -10 -18 0 -16" fill="#16a34a" stroke="#14532d" stroke-width="1"/>
              <path d="M 0 -16 Q 0 -30 6 -28 Q 10 -18 0 -16" fill="#16a34a" stroke="#14532d" stroke-width="1"/>
              
              <circle cx="0" cy="-24" r="5" fill="#ffffff" stroke="#cbd5e1" stroke-width="1"/>
              <circle cx="0" cy="-24" r="2.5" fill="#ca8a04"/>
              
              <path d="M 0 0 Q -4 10 -6 16" stroke="#854d0e" stroke-width="1.2" fill="none"/>
              <path d="M 0 0 Q 0 10 1 18" stroke="#854d0e" stroke-width="1.2" fill="none"/>
              <path d="M 0 0 Q 4 8 7 14" stroke="#854d0e" stroke-width="1.2" fill="none"/>
            </g>
          </defs>

          
          <line x1="8" y1="120" x2="192" y2="120" stroke="#64748b" stroke-width="1.5" stroke-dasharray="4 3"/>
          <text x="192" y="132" font-size="8" font-weight="600" fill="#475569" text-anchor="end">Ground line</text>

          
          <g transform="translate(48, 120)">
            <circle class="glow-ring" cx="0" cy="-14" r="24" fill="none" stroke="#16a34a" stroke-width="2.5" stroke-dasharray="3 3"/>
            <use href="#strawberry-plant"/>
            <text x="0" y="27" font-size="9" font-weight="700" fill="#14532d" text-anchor="middle">Mother Plant</text>
            <text x="0" y="-36" font-size="8.5" fill="#14532d" font-weight="700" text-anchor="middle" class="dna-tag">DNA: 100%</text>
          </g>

          
          <path d="M 48 118 C 75 75, 125 75, 152 118" fill="none" stroke="#15803d" stroke-width="2.5" stroke-linecap="round"/>
          <path d="M 48 118 C 75 75, 125 75, 152 118" fill="none" stroke="#86efac" stroke-width="1.5" class="runner-pulse"/>

          
          <g transform="translate(100, 76)">
            <rect x="-33" y="-8" width="66" height="15" rx="7.5" fill="#ffffff" stroke="#86efac" stroke-width="1.2"/>
            <text x="0" y="2.5" font-size="8" font-weight="700" fill="#14532d" text-anchor="middle">Runner stem</text>
          </g>

          
          <g transform="translate(152, 120)">
            <circle class="glow-ring" cx="0" cy="-14" r="24" fill="none" stroke="#16a34a" stroke-width="2.5" stroke-dasharray="3 3"/>
            <use href="#strawberry-plant"/>
            <text x="0" y="27" font-size="9" font-weight="700" fill="#14532d" text-anchor="middle">Daughter (Clone)</text>
            <text x="0" y="-36" font-size="8.5" fill="#14532d" font-weight="700" text-anchor="middle" class="dna-tag">DNA: 100%</text>
          </g>
        </svg>
      </div>

      <div class="badge badge-asexual" id="badgeAsex">✓ 100% Genetic Clone</div>
    </div>
  </div>

  <div class="controls">
    <button class="btn-toggle" id="btnCompare" onclick="toggleHighlights()">
      <span id="btnIcon">🌱</span>
      <span id="btnText">Compare DNA / Traits</span>
    </button>
  </div>

  <script>
    let highlighted = false;
    function toggleHighlights() {
      highlighted = !highlighted;
      const area = document.getElementById('diagramArea');
      const btnText = document.getElementById('btnText');
      const btnIcon = document.getElementById('btnIcon');
      const badgeSex = document.getElementById('badgeSex');
      const badgeAsex = document.getElementById('badgeAsex');
      
      if (highlighted) {
        area.classList.add('glow-active');
        badgeSex.classList.add('active');
        badgeAsex.classList.add('active');
        btnIcon.textContent = '↺';
        btnText.textContent = 'Reset View';
      } else {
        area.classList.remove('glow-active');
        badgeSex.classList.remove('active');
        badgeAsex.classList.remove('active');
        btnIcon.textContent = '🌱';
        btnText.textContent = 'Compare DNA / Traits';
      }
    }
  </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: #1e2945;
      background: #ffffff;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      min-height: 100vh;
      padding: 10px 12px;
      user-select: none;
    }

    /* Stepper Controls */
    .controls {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: center;
      gap: 6px;
      width: 100%;
      max-width: 520px;
      z-index: 10;
    }

    .step-btn {
      flex: 1 1 auto;
      min-width: 90px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 5px;
      padding: 7px 10px;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
      background: #f1f5f9;
      border: 2px solid transparent;
      border-radius: 8px;
      cursor: pointer;
      transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
      white-space: nowrap;
    }

    .step-btn:hover {
      background: #e2e8f0;
    }

    .step-btn.active {
      color: #15803d;
      background: #dcfce7;
      border-color: #22c55e;
      box-shadow: 0 2px 4px rgba(34, 197, 94, 0.15);
    }

    .step-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: rgba(0, 0, 0, 0.08);
      font-size: 11px;
      flex-shrink: 0;
    }

    .step-btn.active .step-num {
      background: #16a34a;
      color: #ffffff;
    }

    .play-btn {
      width: 34px;
      height: 34px;
      border-radius: 8px;
      border: none;
      background: #f1f5f9;
      color: #334155;
      font-size: 13px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.2s ease;
      flex-shrink: 0;
    }
    .play-btn:hover { background: #e2e8f0; }

    /* Main Stage */
    .stage {
      position: relative;
      width: 100%;
      max-width: 580px;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 220px;
      margin: 8px 0;
    }

    svg {
      width: 100%;
      height: 100%;
      max-height: 480px;
      overflow: visible;
    }

    /* SVG Visual Elements Transitions */
    .runner-stem {
      fill: none;
      stroke: #22c55e;
      stroke-width: 4;
      stroke-linecap: round;
      transition: stroke-dashoffset 0.8s ease-in-out;
    }

    .baby-plant, .baby-roots, .label-baby, .node-touch {
      transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    .badge-label {
      font-size: 12px;
      font-weight: 700;
      fill: #1e2945;
    }

    .sub-label {
      font-size: 11px;
      font-weight: 700;
      fill: #15803d;
    }

    .soil-label {
      font-size: 11px;
      font-weight: 700;
      fill: #E6D2B5;
      letter-spacing: 0.8px;
    }

    /* Step indicator cues */
    .step-cue {
      opacity: 0;
      transition: opacity 0.4s ease;
      pointer-events: none;
    }
    .step-cue.visible {
      opacity: 1;
    }

    @media (max-width: 420px) {
      .step-btn {
        padding: 5px 7px;
        font-size: 11px;
        min-width: 75px;
      }
      .step-num {
        width: 16px;
        height: 16px;
        font-size: 10px;
      }
      .play-btn {
        width: 30px;
        height: 30px;
      }
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <button class="step-btn active" id="btn-0">
      <span class="step-num">1</span>
      <span>Stem extends</span>
    </button>
    <button class="step-btn" id="btn-1">
      <span class="step-num">2</span>
      <span>Touches soil</span>
    </button>
    <button class="step-btn" id="btn-2">
      <span class="step-num">3</span>
      <span>Grows roots & shoots</span>
    </button>
    <button class="play-btn" id="play-btn" title="Toggle Auto-play">⏸</button>
  </div>

  
  <div class="stage">
    <svg viewBox="0 0 540 300" aria-label="Asexual plant reproduction by runner stem">
      <defs>
        
        <linearGradient id="skyGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#f0f9ff" />
          <stop offset="100%" stop-color="#ffffff" />
        </linearGradient>
        <linearGradient id="soilGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#6e300c" />
          <stop offset="100%" stop-color="#3d1702" />
        </linearGradient>
        
        <filter id="softShadow" x="-10%" y="-10%" width="120%" height="120%">
          <feDropShadow dx="0" dy="2" stdDeviation="2" flood-opacity="0.12" />
        </filter>
      </defs>

      
      <rect x="0" y="0" width="540" height="200" fill="url(#skyGrad)" rx="8" />

      
      <rect x="0" y="200" width="540" height="100" fill="url(#soilGrad)" rx="0 0 8 8" />
      <line x1="0" y1="200" x2="540" y2="200" stroke="#22c55e" stroke-width="3" stroke-dasharray="6,4" />
      <text x="270" y="222" text-anchor="middle" class="soil-label">SOIL SURFACE</text>

      
      <g id="motherPlant" transform="translate(100, 200)">
        
        <g stroke="#d97706" stroke-width="2.5" stroke-linecap="round" fill="none" opacity="0.9">
          <path d="M 0,0 C -5,25 -25,50 -30,80" />
          <path d="M 0,0 C 0,30 0,60 -5,85" />
          <path d="M 0,0 C 10,25 25,55 30,75" />
          <path d="M -15,30 C -25,45 -35,55 -40,65" stroke-width="1.5" />
          <path d="M 12,30 C 22,45 35,55 42,65" stroke-width="1.5" />
        </g>

        
        <circle cx="0" cy="-2" r="7" fill="#15803d" />

        
        <g stroke="#16a34a" stroke-width="3" fill="none" stroke-linecap="round">
          <path d="M 0,0 C -15,-30 -30,-45 -45,-60" />
          <path d="M 0,0 C -5,-40 -10,-70 -15,-90" />
          <path d="M 0,0 C 10,-35 15,-65 20,-85" />
          <path d="M 0,0 C 20,-25 35,-40 50,-50" />
        </g>

        
        <g fill="#22c55e" stroke="#15803d" stroke-width="1.5" filter="url(#softShadow)">
          <ellipse cx="-45" cy="-60" rx="16" ry="11" transform="rotate(-30 -45 -60)" />
          <ellipse cx="-15" cy="-90" rx="18" ry="12" transform="rotate(-5 -15 -90)" />
          <ellipse cx="20" cy="-85" rx="17" ry="12" transform="rotate(15 20 -85)" />
          <ellipse cx="50" cy="-50" rx="15" ry="10" transform="rotate(35 50 -50)" />
          <ellipse cx="0" cy="-65" rx="16" ry="11" />
        </g>

        
        <g transform="translate(28, -25)">
          <path d="M 0,-8 C 6,-8 10,-2 7,6 C 5,11 0,14 0,14 C 0,14 -5,11 -7,6 C -10,-2 -6,-8 0,-8 Z" fill="#ef4444" />
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          <circle cx="-2" cy="0" r="0.7" fill="#fef08a" />
          <circle cx="2" cy="1" r="0.7" fill="#fef08a" />
          <circle cx="0" cy="5" r="0.7" fill="#fef08a" />
        </g>

        
        <g transform="translate(0, -114)">
          <rect x="-70" y="-12" width="140" height="24" rx="6" fill="#ffffff" stroke="#cbd5e1" stroke-width="1" filter="url(#softShadow)" />
          <text x="0" y="4" text-anchor="middle" class="badge-label">Mother Strawberry Plant</text>
        </g>
      </g>

      
      <path id="runnerPath" class="runner-stem"
            d="M 100,198 C 170,140 330,135 420,198"
            stroke-dasharray="350"
            stroke-dashoffset="0" />

      
      <g id="runnerLabel" transform="translate(260, 130)">
        <rect x="-85" y="-12" width="170" height="24" rx="6" fill="#ffffff" stroke="#86efac" stroke-width="1.5" filter="url(#softShadow)" />
        <text x="0" y="4" text-anchor="middle" class="sub-label">Runner (horizontal stem)</text>
      </g>

      
      <g id="cue1" class="step-cue" transform="translate(285, 155)">
        <path d="M -15,0 L 15,0 M 8,-6 L 15,0 L 8,6" stroke="#16a34a" stroke-width="3" stroke-linecap="round" stroke-linejoin="round" fill="none" />
      </g>

      
      <g id="babyNode" transform="translate(420, 200)">
        
        <circle id="touchDot" class="node-touch" cx="0" cy="0" r="5" fill="#eab308" stroke="#ffffff" stroke-width="2" />

        
        <g id="babyRoots" class="baby-roots" stroke="#d97706" stroke-width="2" stroke-linecap="round" fill="none">
          <path d="M 0,0 C -5,15 -12,30 -15,48" />
          <path d="M 0,0 C 0,18 2,35 0,52" />
          <path d="M 0,0 C 6,15 14,32 18,45" />
          <path d="M -6,18 C -12,26 -16,35 -20,40" stroke-width="1.2" />
          <path d="M 7,18 C 12,26 18,34 22,40" stroke-width="1.2" />
        </g>

        
        <g id="babyLeaves" class="baby-plant">
          
          <path d="M 0,0 C -8,-15 -15,-25 -20,-35" stroke="#16a34a" stroke-width="2" fill="none" />
          <path d="M 0,0 C 0,-18 2,-32 0,-44" stroke="#16a34a" stroke-width="2" fill="none" />
          <path d="M 0,0 C 8,-14 16,-24 22,-32" stroke="#16a34a" stroke-width="2" fill="none" />
          
          <g fill="#4ade80" stroke="#15803d" stroke-width="1.2">
            <ellipse cx="-20" cy="-35" rx="10" ry="7" transform="rotate(-25 -20 -35)" />
            <ellipse cx="0" cy="-44" rx="11" ry="8" />
            <ellipse cx="22" cy="-32" rx="9" ry="6" transform="rotate(25 22 -32)" />
          </g>
        </g>

        
        <g id="babyLabel" class="label-baby" transform="translate(0, -68)">
          <rect x="-85" y="-12" width="170" height="24" rx="6" fill="#ffffff" stroke="#86efac" stroke-width="1.5" filter="url(#softShadow)" />
          <text x="0" y="4" text-anchor="middle" class="sub-label">Baby Plant (Identical Clone)</text>
        </g>
      </g>
    </svg>
  </div>

  <script>
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    const runnerLabel = document.getElementById('runnerLabel');
    const touchDot = document.getElementById('touchDot');
    const babyRoots = document.getElementById('babyRoots');
    const babyLeaves = document.getElementById('babyLeaves');
    const babyLabel = document.getElementById('babyLabel');
    const cue1 = document.getElementById('cue1');
    const playBtn = document.getElementById('play-btn');
    const stepBtns = [
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    let currentStep = 0;
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    let timer = null;

    // Visual states for 3 steps
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      // Update badge buttons
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      if (index === 0) {
        // Step 1: Stem extends
        runnerPath.style.strokeDashoffset = '175'; // half grown
        runnerLabel.style.opacity = '1';
        cue1.classList.add('visible');

        touchDot.style.opacity = '0';
        touchDot.style.transform = 'scale(0)';

        babyRoots.style.opacity = '0';
        babyRoots.style.transform = 'scale(0)';

        babyLeaves.style.opacity = '0';
        babyLeaves.style.transform = 'scale(0)';

        babyLabel.style.opacity = '0';
        babyLabel.style.transform = 'translateY(10px) scale(0.9)';
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        // Step 2: Touches soil
        runnerPath.style.strokeDashoffset = '0'; // fully arched to ground
        runnerLabel.style.opacity = '1';
        cue1.classList.remove('visible');

        touchDot.style.opacity = '1';
        touchDot.style.transform = 'scale(1.2)';

        babyRoots.style.opacity = '0';
        babyRoots.style.transform = 'scale(0)';

        babyLeaves.style.opacity = '0';
        babyLeaves.style.transform = 'scale(0)';

        babyLabel.style.opacity = '0';
        babyLabel.style.transform = 'translateY(10px) scale(0.9)';
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        touchDot.style.transform = 'scale(1)';

        babyRoots.style.opacity = '1';
        babyRoots.style.transform = 'scale(1)';

        babyLeaves.style.opacity = '1';
        babyLeaves.style.transform = 'scale(1)';

        babyLabel.style.opacity = '1';
        babyLabel.style.transform = 'translateY(0) scale(1)';
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      playBtn.textContent = '⏸';
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    });

    // Initialize
    renderStep(0);
    startAutoPlay();
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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">
  <title>Why Fungi Are NOT Plants</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      background: #ffffff;
      color: #1e2945;
      padding: 8px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    /* Header */
    .header {
      text-align: center;
      padding: 2px 0 6px;
    }
    .header h1 {
      font-size: 17px;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.01em;
    }
    .header p {
      font-size: 13px;
      color: #64748b;
      font-weight: 500;
      margin-top: 2px;
    }

    /* Filter Controls */
    .filter-tabs {
      display: flex;
      justify-content: center;
      gap: 6px;
      flex-wrap: wrap;
      margin-bottom: 2px;
    }
    .tab-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    }
    .tab-btn.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.25);
    }

    /* Comparison Grid */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 8px;
      align-items: stretch;
      position: relative;
    }

    .vs-badge {
      align-self: center;
      background: #0f172a;
      color: #ffffff;
      font-size: 11px;
      font-weight: 800;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 2;
      box-shadow: 0 2px 5px rgba(0,0,0,0.15);
    }

    /* Kingdom Card */
    .side-card {
      border-radius: 12px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      border: 1px solid #e2e8f0;
      position: relative;
    }

    .card-plant {
      background: #f0fdf4;
      border-color: #bbf7d0;
    }
    .card-fungi {
      background: #faf5ff;
      border-color: #e9d5ff;
    }

    .card-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid rgba(0,0,0,0.06);
      padding-bottom: 6px;
    }
    .card-title {
      font-size: 14px;
      font-weight: 800;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .card-plant .card-title { color: #15803d; }
    .card-fungi .card-title { color: #7e22ce; }

    .role-tag {
      font-size: 10px;
      font-weight: 700;
      text-transform: uppercase;
      padding: 2px 6px;
      border-radius: 6px;
      letter-spacing: 0.03em;
    }
    .card-plant .role-tag {
      background: #dcfce7;
      color: #166534;
      border: 1px solid #86efac;
    }
    .card-fungi .role-tag {
      background: #f3e8ff;
      color: #6b21a8;
      border: 1px solid #d8b4fe;
    }

    /* Visual Illustrations */
    .diagram-stage {
      background: #ffffff;
      border-radius: 8px;
      padding: 6px;
      height: 105px;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(0,0,0,0.05);
      position: relative;
      overflow: hidden;
    }

    .diagram-stage svg {
      width: 100%;
      height: 100%;
    }

    /* Key Fact Badges */
    .fact-rows {
      display: flex;
      flex-direction: column;
      gap: 5px;
    }

    .fact-item {
      background: #ffffff;
      border-radius: 7px;
      padding: 5px 8px;
      border: 1px solid #e2e8f0;
      display: flex;
      flex-direction: column;
      gap: 1px;
      transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    }
    .fact-item.highlight {
      background: #ffffff;
      box-shadow: 0 0 0 2px #0284c7;
      border-color: #0284c7;
    }
    .fact-item.dimmed {
      opacity: 0.4;
    }

    .fact-label {
      font-size: 10px;
      font-weight: 700;
      color: #64748b;
      text-transform: uppercase;
      letter-spacing: 0.02em;
    }
    .fact-value {
      font-size: 12px;
      font-weight: 700;
      color: #0f172a;
    }
    .fact-sub {
      font-size: 11px;
      font-weight: 500;
      color: #475569;
    }

    /* Bottom Showcase */
    .showcase-container {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 7px 10px;
    }
    .showcase-title {
      font-size: 11px;
      font-weight: 800;
      color: #475569;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      margin-bottom: 6px;
      text-align: center;
    }
    .showcase-deck {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 6px;
    }
    .showcase-card {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      padding: 6px;
      text-align: center;
      cursor: pointer;
      transition: border-color 0.2s ease, background-color 0.2s ease;
    }
    .showcase-card.active {
      border-color: #9333ea;
      background: #faf5ff;
    }
    .showcase-card .icon {
      font-size: 18px;
      display: block;
      margin-bottom: 2px;
    }
    .showcase-card .name {
      font-size: 11px;
      font-weight: 700;
      color: #0f172a;
    }
    .showcase-card .type {
      font-size: 10px;
      font-weight: 500;
      color: #6b21a8;
    }

    /* Small Screen Adjustments */
    @media (max-width: 480px) {
      .comparison-grid {
        grid-template-columns: 1fr;
      }
      .vs-badge {
        display: none;
      }
      .diagram-stage {
        height: 95px;
      }
    }
  </style>
</head>
<body>

  
  <div class="header">
    <h1>Why Fungi Are NOT Plants</h1>
    <p>Autotrophs (Make Food) vs. Heterotrophs (Absorb Food)</p>
  </div>

  
  <div class="filter-tabs" role="tablist">
    <button class="tab-btn active" onclick="setFilter('all')">✦ View All</button>
    <button class="tab-btn" onclick="setFilter('nutrition')">☀️ Nutrition</button>
    <button class="tab-btn" onclick="setFilter('cellwall')">🧱 Cell Wall</button>
    <button class="tab-btn" onclick="setFilter('storage')">📦 Food Storage</button>
  </div>

  
  <div class="comparison-grid">

    
    <div class="side-card card-plant">
      <div class="card-header">
        <div class="card-title">🌱 Plants</div>
        <span class="role-tag">Autotroph</span>
      </div>

      
      <div class="diagram-stage">
        <svg viewBox="0 0 160 100">
          
          <circle cx="24" cy="20" r="10" fill="#facc15" />
          <path d="M 32 26 L 55 45" stroke="#eab308" stroke-width="2" stroke-dasharray="3,2" />
          <text x="35" y="16" font-size="8" font-weight="700" fill="#ca8a04">Sunlight</text>

          
          <text x="8" y="52" font-size="8" font-weight="700" fill="#0284c7">H₂O + CO₂</text>
          <path d="M 45 52 L 62 55" stroke="#0284c7" stroke-width="1.5" stroke-linecap="round" marker-end="url(#arrow-blue)" />

          
          <path d="M 60 75 C 55 40, 95 30, 135 45 C 145 65, 105 85, 60 75 Z" fill="#22c55e" stroke="#15803d" stroke-width="1.5" />
          
          <path d="M 60 75 Q 95 58 135 45" stroke="#15803d" stroke-width="1.5" fill="none" />
          
          
          <circle cx="85" cy="52" r="2.5" fill="#166534" />
          <circle cx="100" cy="58" r="2.5" fill="#166534" />
          <circle cx="112" cy="49" r="2.5" fill="#166534" />

          
          <rect x="75" y="78" width="70" height="16" rx="4" fill="#ecfdf5" stroke="#10b981" stroke-width="1" />
          <text x="110" y="89" font-size="8.5" font-weight="800" fill="#065f46" text-anchor="middle">Makes Glucose</text>
        </svg>
      </div>

      
      <div class="fact-rows">
        <div class="fact-item" id="plant-nutrition">
          <span class="fact-label">Nutrition</span>
          <span class="fact-value">Photosynthesis</span>
          <span class="fact-sub">Produces own glucose</span>
        </div>
        <div class="fact-item" id="plant-cellwall">
          <span class="fact-label">Cell Structure</span>
          <span class="fact-value">Cellulose Wall</span>
          <span class="fact-sub">Has Chloroplasts</span>
        </div>
        <div class="fact-item" id="plant-storage">
          <span class="fact-label">Carbohydrate Storage</span>
          <span class="fact-value">Stores as Starch</span>
        </div>
      </div>
    </div>

    
    <div class="vs-badge">VS</div>

    
    <div class="side-card card-fungi">
      <div class="card-header">
        <div class="card-title">🍄 Fungi</div>
        <span class="role-tag">Saprotroph</span>
      </div>

      
      <div class="diagram-stage">
        <svg viewBox="0 0 160 100">
          
          <rect x="8" y="70" width="144" height="24" rx="4" fill="#78350f" opacity="0.8" />
          <text x="80" y="85" font-size="8" font-weight="700" fill="#fef3c7" text-anchor="middle">Dead Matter / Wood</text>

          
          <path d="M 68 70 Q 60 76 52 82 M 72 70 Q 75 78 80 84 M 85 70 Q 95 76 105 82 M 52 82 Q 42 85 36 88 M 80 84 Q 82 89 86 92" stroke="#e9d5ff" stroke-width="1.8" fill="none" stroke-linecap="round" />
          
          
          <circle cx="48" cy="80" r="1.5" fill="#a855f7" />
          <circle cx="88" cy="82" r="1.5" fill="#a855f7" />
          <circle cx="100" cy="80" r="1.5" fill="#a855f7" />

          
          <path d="M 68 70 L 72 38 L 82 38 L 86 70 Z" fill="#f3e8ff" stroke="#a855f7" stroke-width="1.2" />
          
          <path d="M 50 38 C 50 15, 104 15, 104 38 Z" fill="#9333ea" stroke="#6b21a8" stroke-width="1.2" />
          
          <circle cx="68" cy="26" r="2.5" fill="#f3e8ff" />
          <circle cx="86" cy="24" r="3" fill="#f3e8ff" />

          
          <rect x="12" y="6" width="136" height="15" rx="4" fill="#faf5ff" stroke="#c084fc" stroke-width="1" />
          <text x="80" y="16.5" font-size="8" font-weight="800" fill="#6b21a8" text-anchor="middle">Enzymes Digest Outside</text>
        </svg>
      </div>

      
      <div class="fact-rows">
        <div class="fact-item" id="fungi-nutrition">
          <span class="fact-label">Nutrition</span>
          <span class="fact-value">Saprotrophic</span>
          <span class="fact-sub">Absorbs dead nutrients</span>
        </div>
        <div class="fact-item" id="fungi-cellwall">
          <span class="fact-label">Cell Structure</span>
          <span class="fact-value">Chitin Wall</span>
          <span class="fact-sub">NO Chloroplasts</span>
        </div>
        <div class="fact-item" id="fungi-storage">
          <span class="fact-label">Carbohydrate Storage</span>
          <span class="fact-value">Stores as Glycogen</span>
        </div>
      </div>
    </div>

  </div>

  
  <div class="showcase-container">
    <div class="showcase-title">Kingdom Fungi Diversity Forms</div>
    <div class="showcase-deck">
      <div class="showcase-card active" onclick="selectShowcase(this)">
        <span class="icon">🍄</span>
        <div class="name">Mushroom</div>
        <div class="type">Multicellular Fruiting</div>
      </div>
      <div class="showcase-card" onclick="selectShowcase(this)">
        <span class="icon">🍞</span>
        <div class="name">Bread Mold</div>
        <div class="type">Filamentous Hyphae</div>
      </div>
      <div class="showcase-card" onclick="selectShowcase(this)">
        <span class="icon">🧫</span>
        <div class="name">Yeast</div>
        <div class="type">Single-Celled (Budding)</div>
      </div>
    </div>
  </div>

  <script>
    function setFilter(type) {
      // Update Tab Buttons
      const tabs = document.querySelectorAll('.tab-btn');
      tabs.forEach(tab => tab.classList.remove('active'));
      event.target.classList.add('active');

      const items = document.querySelectorAll('.fact-item');
      items.forEach(item => {
        item.classList.remove('highlight', 'dimmed');
        if (type === 'all') return;

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          item.classList.add('highlight');
        } else {
          item.classList.add('dimmed');
        }
      });
    }

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

The Five Kingdoms of Life: An Overview

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

    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
      max-width: 580px;
    }

    @media (max-width: 420px) {
      .grid {
        grid-template-columns: 1fr;
      }
    }

    .panel {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 16px;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
      cursor: pointer;
      user-select: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .panel.bacteria {
      border-color: #fdba74;
    }
    .panel.protist {
      border-color: #f472b6;
    }

    .panel:hover {
      box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    }

    .header-tag {
      font-weight: 700;
      font-size: 15px;
      padding: 4px 12px;
      border-radius: 999px;
      margin-bottom: 8px;
    }

    .tag-orange {
      background: #fff7ed;
      color: #ea580c;
      border: 1px solid #fed7aa;
    }

    .tag-pink {
      background: #fdf2f8;
      color: #db2777;
      border: 1px solid #fbcfe8;
    }

    .viewport {
      width: 100%;
      height: 170px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    .badge {
      font-size: 13px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 8px;
      text-align: center;
      margin-top: 6px;
    }

    .badge-orange {
      background: #ffedd5;
      color: #9a3412;
    }

    .badge-pink {
      background: #fce7f3;
      color: #9d174d;
    }

    .scale-bar {
      width: 100%;
      max-width: 580px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 13px;
      font-weight: 600;
      color: #4b5563;
    }

    .scale-visual {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .mini-dot {
      width: 6px;
      height: 6px;
      background: #f97316;
      border-radius: 50%;
      display: inline-block;
    }

    .mini-blob {
      width: 22px;
      height: 22px;
      background: #ec4899;
      border-radius: 50%;
      display: inline-block;
    }

    .pulse {
      animation: gentle-pulse 3s ease-in-out infinite;
    }

    @keyframes gentle-pulse {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.03); }
    }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="panel bacteria">
      <div class="header-tag tag-orange">Bacteria</div>
      <div class="viewport">
        <svg viewBox="0 0 200 160">
          
          <rect x="55" y="55" width="90" height="50" rx="25" fill="#fff7ed" stroke="#f97316" stroke-width="3.5" />
          
          
          <path d="M 72 80 Q 82 66 95 80 T 118 78 T 128 82" fill="none" stroke="#ea580c" stroke-width="3" stroke-linecap="round" stroke-linejoin="round" />
          <path d="M 80 84 Q 92 94 105 84 T 122 84" fill="none" stroke="#ea580c" stroke-width="2.5" stroke-linecap="round" />

          
          <line x1="100" y1="88" x2="100" y2="128" stroke="#f97316" stroke-width="1.5" stroke-dasharray="3,3" />
          <circle cx="100" cy="88" r="3" fill="#f97316" />
          <text x="100" y="142" font-size="12" font-weight="700" fill="#c2410c" text-anchor="middle">Loose DNA</text>
        </svg>
      </div>
      <div class="badge badge-orange">No Nucleus</div>
    </div>

    
    <div class="panel protist">
      <div class="header-tag tag-pink">Protist</div>
      <div class="viewport">
        <svg viewBox="0 0 200 160">
          
          <path class="pulse" d="M 45,75 C 30,45 65,22 105,25 C 145,28 175,55 168,92 C 162,130 135,146 95,142 C 55,138 32,115 45,75 Z" fill="#fdf2f8" stroke="#ec4899" stroke-width="3.5" />
          
          
          <circle cx="105" cy="82" r="26" fill="#fce7f3" stroke="#db2777" stroke-width="3" />
          
          <circle cx="105" cy="82" r="10" fill="#be185d" />

          
          <line x1="105" y1="56" x2="105" y2="18" stroke="#db2777" stroke-width="1.5" stroke-dasharray="3,3" />
          <circle cx="105" cy="56" r="3" fill="#db2777" />
          <text x="105" y="12" font-size="12" font-weight="700" fill="#9d174d" text-anchor="middle">Cell Nucleus</text>
        </svg>
      </div>
      <div class="badge badge-pink">Control Center</div>
    </div>
  </div>

  
  <div class="scale-bar">
    <div class="scale-visual">
      <span class="mini-dot"></span>
      <span>vs</span>
      <span class="mini-blob"></span>
    </div>
    <span>Protists: 10× to 100× Larger</span>
  </div>

</body>
</html>

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

    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: transparent;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      user-select: none;
    }

    .toolbar {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
      justify-content: center;
      width: 100%;
      margin-bottom: 12px;
    }

    .btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 6px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: all 0.2s ease;
    }

    .btn:hover {
      border-color: #0284c7;
      color: #0284c7;
    }

    .btn.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.3);
    }

    .tree-container {
      position: relative;
      width: 100%;
      max-width: 580px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 16px;
      flex: 1;
      justify-content: center;
    }

    .node {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 10px;
      padding: 8px 12px;
      text-align: center;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      position: relative;
      transition: all 0.25s ease;
      cursor: pointer;
      z-index: 2;
    }

    .node.dimmed {
      opacity: 0.35;
      border-color: #e2e8f0;
    }

    .node.active {
      border-color: #0284c7;
      background: #f0f9ff;
      color: #0369a1;
      box-shadow: 0 0 0 2px rgba(2, 132, 199, 0.2);
    }

    .root-node {
      font-size: 14px;
      padding: 8px 16px;
    }

    .branch-row {
      display: flex;
      width: 100%;
      justify-content: space-between;
      gap: 8px;
      position: relative;
    }

    .column {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 14px;
      flex: 1;
    }

    .leaf-group {
      display: flex;
      gap: 6px;
      width: 100%;
      justify-content: center;
      flex-wrap: wrap;
    }

    .leaf {
      flex: 1;
      min-width: 68px;
      padding: 8px 4px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }

    .leaf .icon {
      font-size: 20px;
      line-height: 1;
    }

    .leaf .name {
      font-size: 12px;
      font-weight: 700;
    }

    .leaf .trait {
      font-size: 11px;
      font-weight: 500;
      color: #64748b;
      line-height: 1.1;
    }

    .leaf.active .trait {
      color: #0369a1;
    }

    /* SVG Connectors */
    .connections {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 1;
    }

    .connector-line {
      stroke: #cbd5e1;
      stroke-width: 2;
      stroke-linecap: round;
      fill: none;
      transition: stroke 0.25s ease, stroke-width 0.25s ease;
    }

    .connector-line.active {
      stroke: #0284c7;
      stroke-width: 3;
    }

    .connector-line.dimmed {
      stroke: #f1f5f9;
    }

    .path-pill {
      font-size: 11px;
      color: #64748b;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      padding: 2px 6px;
      border-radius: 10px;
      margin-top: -6px;
      margin-bottom: -6px;
      z-index: 2;
    }

    .path-pill.active {
      color: #0369a1;
      background: #e0f2fe;
      border-color: #bae6fd;
    }
  </style>
</head>
<body>

  
  <div class="toolbar">
    <button class="btn active" onclick="selectKingdom('all')">All</button>
    <button class="btn" onclick="selectKingdom('bacteria')">🧫 Bacteria</button>
    <button class="btn" onclick="selectKingdom('protist')">🦠 Protist</button>
    <button class="btn" onclick="selectKingdom('plant')">🌻 Plant</button>
    <button class="btn" onclick="selectKingdom('fungi')">🍄 Fungi</button>
    <button class="btn" onclick="selectKingdom('animal')">🦁 Animal</button>
  </div>

  
  <div class="tree-container" id="treeContainer">
    <svg class="connections" id="svgConnections"></svg>

    
    <div class="node root-node" id="node-root" onclick="selectKingdom('all')">
      Cell Structure?
    </div>

    
    <div class="branch-row">
      
      
      <div class="column" style="flex: 1.1;">
        <span class="path-pill" id="pill-single">Single-celled</span>
        <div class="node" id="node-nucleus" onclick="selectGroup('single')">
          Has Nucleus?
        </div>
        
        <div class="leaf-group">
          
          <div class="node leaf" id="leaf-bacteria" onclick="selectKingdom('bacteria')">
            <span class="icon">🧫</span>
            <span class="name">Bacteria</span>
            <span class="trait">No nucleus</span>
          </div>

          
          <div class="node leaf" id="leaf-protist" onclick="selectKingdom('protist')">
            <span class="icon">🦠</span>
            <span class="name">Protist</span>
            <span class="trait">With nucleus</span>
          </div>
        </div>
      </div>

      
      <div class="column" style="flex: 1.9;">
        <span class="path-pill" id="pill-multi">Multicellular</span>
        <div class="node" id="node-food" onclick="selectGroup('multi')">
          Nutrition & Movement?
        </div>

        <div class="leaf-group">
          
          <div class="node leaf" id="leaf-plant" onclick="selectKingdom('plant')">
            <span class="icon">🌻</span>
            <span class="name">Plant</span>
            <span class="trait">Light</span>
          </div>

          
          <div class="node leaf" id="leaf-fungi" onclick="selectKingdom('fungi')">
            <span class="icon">🍄</span>
            <span class="name">Fungi</span>
            <span class="trait">Absorbs</span>
          </div>

          
          <div class="node leaf" id="leaf-animal" onclick="selectKingdom('animal')">
            <span class="icon">🦁</span>
            <span class="name">Animal</span>
            <span class="trait">Eats &amp; moves</span>
          </div>
        </div>
      </div>

    </div>
  </div>

  <script>
    const paths = {
      bacteria: {
        nodes: ['node-root', 'node-nucleus', 'leaf-bacteria'],
        pills: ['pill-single'],
        lines: ['line-root-nucleus', 'line-nucleus-bacteria']
      },
      protist: {
        nodes: ['node-root', 'node-nucleus', 'leaf-protist'],
        pills: ['pill-single'],
        lines: ['line-root-nucleus', 'line-nucleus-protist']
      },
      plant: {
        nodes: ['node-root', 'node-food', 'leaf-plant'],
        pills: ['pill-multi'],
        lines: ['line-root-food', 'line-food-plant']
      },
      fungi: {
        nodes: ['node-root', 'node-food', 'leaf-fungi'],
        pills: ['pill-multi'],
        lines: ['line-root-food', 'line-food-fungi']
      },
      animal: {
        nodes: ['node-root', 'node-food', 'leaf-animal'],
        pills: ['pill-multi'],
        lines: ['line-root-food', 'line-food-animal']
      }
    };

    function drawLines() {
      const svg = document.getElementById('svgConnections');
      const container = document.getElementById('treeContainer');
      const cRect = container.getBoundingClientRect();

      const pairs = [
        { id: 'line-root-nucleus', from: 'node-root', to: 'node-nucleus' },
        { id: 'line-root-food', from: 'node-root', to: 'node-food' },
        { id: 'line-nucleus-bacteria', from: 'node-nucleus', to: 'leaf-bacteria' },
        { id: 'line-nucleus-protist', from: 'node-nucleus', to: 'leaf-protist' },
        { id: 'line-food-plant', from: 'node-food', to: 'leaf-plant' },
        { id: 'line-food-fungi', from: 'node-food', to: 'leaf-fungi' },
        { id: 'line-food-animal', from: 'node-food', to: 'leaf-animal' }
      ];

      let svgHtml = '';
      pairs.forEach(pair => {
        const fromEl = document.getElementById(pair.from);
        const toEl = document.getElementById(pair.to);

        if (!fromEl || !toEl) return;

        const fRect = fromEl.getBoundingClientRect();
        const tRect = toEl.getBoundingClientRect();

        const x1 = fRect.left + fRect.width / 2 - cRect.left;
        const y1 = fRect.bottom - cRect.top;
        const x2 = tRect.left + tRect.width / 2 - cRect.left;
        const y2 = tRect.top - cRect.top;

        const cy = (y1 + y2) / 2;
        const d = `M ${x1} ${y1} C ${x1} ${cy}, ${x2} ${cy}, ${x2} ${y2}`;

        svgHtml += `<path id="${pair.id}" class="connector-line" d="${d}" />`;
      });

      svg.innerHTML = svgHtml;
    }

    function selectKingdom(key) {
      // Update top button states
      document.querySelectorAll('.toolbar .btn').forEach(btn => {
        const match = (key === 'all' && btn.textContent.trim() === 'All') ||
                      btn.textContent.toLowerCase().includes(key);
        btn.classList.toggle('active', match);
      });

      const allNodes = document.querySelectorAll('.node');
      const allPills = document.querySelectorAll('.path-pill');
      const allLines = document.querySelectorAll('.connector-line');

      if (key === 'all') {
        allNodes.forEach(el => { el.classList.remove('dimmed', 'active'); });
        allPills.forEach(el => { el.classList.remove('dimmed', 'active'); });
        allLines.forEach(el => { el.classList.remove('dimmed', 'active'); });
        return;
      }

      const activePath = paths[key];
      if (!activePath) return;

      allNodes.forEach(el => {
        const isActive = activePath.nodes.includes(el.id);
        el.classList.toggle('active', isActive);
        el.classList.toggle('dimmed', !isActive);
      });

      allPills.forEach(el => {
        const isActive = activePath.pills.includes(el.id);
        el.classList.toggle('active', isActive);
        el.classList.toggle('dimmed', !isActive);
      });

      allLines.forEach(el => {
        const isActive = activePath.lines.includes(el.id);
        el.classList.toggle('active', isActive);
        el.classList.toggle('dimmed', !isActive);
      });
    }

    function selectGroup(group) {
      if (group === 'single') {
        selectKingdom('bacteria');
      } else {
        selectKingdom('plant');
      }
    }

    window.addEventListener('resize', drawLines);
    window.addEventListener('DOMContentLoaded', drawLines);
    setTimeout(drawLines, 100);
  </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>Pollination vs Fertilisation</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e293b;
      width: 100%;
      padding: 8px 12px;
    }

    .top-controls {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
    }

    .header-tabs {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
    }

    .tab-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 18px;
      padding: 5px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      transition: background 0.15s, color 0.15s;
    }

    .tab-btn.active {
      background: #2563eb;
      border-color: #2563eb;
      color: #ffffff;
    }

    .play-btn {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      border-radius: 18px;
      padding: 5px 12px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      color: #334155;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

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

    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
    }

    @media (max-width: 480px) {
      .comparison-grid {
        grid-template-columns: 1fr;
        gap: 12px;
      }
      .top-controls {
        justify-content: center;
      }
    }

    .stage-panel {
      background: #f8fafc;
      border-radius: 8px;
      padding: 8px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
    }

    .stage-title {
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 2px;
      text-align: center;
    }

    .stage-desc {
      font-size: 11px;
      color: #64748b;
      margin-bottom: 4px;
      text-align: center;
      line-height: 1.2;
    }

    .pollination-theme { color: #d97706; }
    .fertilisation-theme { color: #059669; }

    .svg-canvas {
      width: 100%;
      max-width: 320px;
      height: auto;
      display: block;
      overflow: visible;
    }

    .label-text {
      font-size: 11px;
      font-weight: 700;
      fill: #1e293b;
      font-family: inherit;
    }

    .label-sub {
      font-size: 9.5px;
      font-weight: 500;
      fill: #64748b;
    }

    .leader-line {
      stroke: #64748b;
      stroke-width: 1.25;
      stroke-linecap: round;
      fill: none;
    }

    .leader-dot {
      fill: #475569;
    }

    .badge-bg {
      fill: #ffffff;
      stroke: #e2e8f0;
      stroke-width: 1;
      rx: 4px;
    }
  </style>
</head>
<body>

  <div class="top-controls">
    <div class="header-tabs">
      <button class="tab-btn active" id="tabAll">Both Stages</button>
      <button class="tab-btn" id="tabPol">1. Pollination</button>
      <button class="tab-btn" id="tabFert">2. Fertilisation</button>
    </div>
    <button class="play-btn" id="playToggle">⏸ Pause</button>
  </div>

  <div class="comparison-grid">
    
    <div class="stage-panel" id="panelPol">
      <div class="stage-title pollination-theme">Stage 1: Pollination</div>
      <div class="stage-desc">Pollen transfers from anther to stigma</div>
      <svg class="svg-canvas" viewBox="0 0 240 210" aria-label="Pollination diagram">
        
        <line x1="120" y1="140" x2="120" y2="200" stroke="#4CAF50" stroke-width="7" stroke-linecap="round"/>
        <path d="M 120 170 Q 85 160 80 150 Q 95 180 120 180" fill="#4CAF50"/>
        <path d="M 120 175 Q 155 165 160 155 Q 145 185 120 185" fill="#4CAF50"/>

        
        <circle cx="120" cy="92" r="28" fill="#E91E63" opacity="0.95"/>
        <circle cx="85" cy="115" r="28" fill="#E91E63" opacity="0.95"/>
        <circle cx="155" cy="115" r="28" fill="#E91E63" opacity="0.95"/>
        <circle cx="95" cy="142" r="26" fill="#E91E63" opacity="0.95"/>
        <circle cx="145" cy="142" r="26" fill="#E91E63" opacity="0.95"/>

        
        <ellipse cx="120" cy="125" rx="16" ry="12" fill="#81C784"/>
        <rect x="117" y="92" width="6" height="33" fill="#66BB6A"/>
        
        
        <ellipse id="stigmaTarget" cx="120" cy="90" rx="10" ry="6" fill="#4CAF50" stroke="#2E7D32" stroke-width="1.5"/>

        
        <path d="M 95 126 Q 90 108 85 96" stroke="#64748b" stroke-width="2" fill="none"/>
        <ellipse id="antherLeft" cx="85" cy="94" rx="7" ry="5" fill="#FFB300" stroke="#D97706" stroke-width="1"/>

        <path d="M 145 126 Q 150 108 155 96" stroke="#64748b" stroke-width="2" fill="none"/>
        <ellipse id="antherRight" cx="155" cy="94" rx="7" ry="5" fill="#FFB300" stroke="#D97706" stroke-width="1"/>

        
        <circle cx="83" cy="93" r="1.5" fill="#92400e"/>
        <circle cx="87" cy="95" r="1.5" fill="#92400e"/>
        <circle cx="153" cy="93" r="1.5" fill="#92400e"/>
        <circle cx="157" cy="95" r="1.5" fill="#92400e"/>

        
        <rect x="6" y="70" width="56" height="24" rx="4" class="badge-bg"/>
        <text x="34" y="83" text-anchor="middle" class="label-text">Anther</text>
        <text x="34" y="92" text-anchor="middle" class="label-sub">(pollen)</text>
        <polyline points="62,82 74,82 82,90" class="leader-line"/>
        <circle cx="82" cy="90" r="2.5" class="leader-dot"/>

        
        <rect x="90" y="8" width="60" height="25" rx="4" class="badge-bg" stroke="#4CAF50"/>
        <text x="120" y="21" text-anchor="middle" class="label-text" fill="#15803d">Stigma</text>
        <text x="120" y="30" text-anchor="middle" class="label-sub">(sticky top)</text>
        <line x1="120" y1="33" x2="120" y2="82" class="leader-line" stroke="#15803d"/>
        <circle cx="120" cy="83" r="2.5" fill="#15803d"/>

        
        <g id="beeGroup" transform="translate(40, 42)">
          <ellipse cx="0" cy="0" rx="13" ry="9" fill="#FFB300" stroke="#B45309" stroke-width="1"/>
          
          <path d="M -4 -8 L -4 8 M 2 -9 L 2 9" stroke="#1e293b" stroke-width="3" stroke-linecap="round"/>
          
          <ellipse cx="-2" cy="-10" rx="7" ry="4" fill="#E2E8F0" opacity="0.85" transform="rotate(-25 -2 -10)"/>
          <ellipse cx="4" cy="-10" rx="7" ry="4" fill="#E2E8F0" opacity="0.85" transform="rotate(25 4 -10)"/>
          
          <circle cx="8" cy="-2" r="1.5" fill="#1e293b"/>
          <path d="M 8 2 Q 10 4 11 2" stroke="#1e293b" stroke-width="1" fill="none"/>
          
          <circle id="beePollenLeg" cx="-2" cy="8" r="3.5" fill="#FFB300" stroke="#d97706" stroke-width="1" opacity="0"/>
        </g>

        
        <circle id="pollenGrain" cx="85" cy="94" r="3.5" fill="#FFB300" stroke="#B45309" stroke-width="1.2" opacity="1"/>

        
        <path d="M 85 88 Q 100 50 118 84" stroke="#FFB300" stroke-width="1.5" stroke-dasharray="3,3" fill="none" opacity="0.7"/>
      </svg>
    </div>

    
    <div class="stage-panel" id="panelFert">
      <div class="stage-title fertilisation-theme">Stage 2: Fertilisation</div>
      <div class="stage-desc">Pollen tube delivers male cell to ovule</div>
      <svg class="svg-canvas" viewBox="0 0 240 210" aria-label="Fertilisation cross-section diagram">
        
        <line x1="120" y1="175" x2="120" y2="200" stroke="#4CAF50" stroke-width="7" stroke-linecap="round"/>

        
        <path d="M 108 72 L 108 108 C 82 118 80 166 120 166 C 160 166 158 118 132 108 L 132 72 Z" fill="#DCFCE7" stroke="#4CAF50" stroke-width="2.5"/>
        
        
        <ellipse cx="120" cy="72" rx="16" ry="6" fill="#86EFAC" stroke="#4CAF50" stroke-width="2"/>

        
        <ellipse id="ovuleBody" cx="120" cy="140" rx="16" ry="14" fill="#FEF08A" stroke="#CA8A04" stroke-width="2"/>
        
        <circle cx="120" cy="140" r="4.5" fill="#EA580C"/>

        
        <circle id="fertPollenGrain" cx="120" cy="69" r="4" fill="#FFB300" stroke="#B45309" stroke-width="1.2"/>

        
        <path id="pollenTube" d="M 120 72 L 120 135" stroke="#FFB300" stroke-width="4" stroke-linecap="round" fill="none" stroke-dasharray="64" stroke-dashoffset="64"/>

        
        <g id="seedStarburst" opacity="0" transform="translate(120, 140)">
          <circle cx="0" cy="0" r="22" fill="#FBBF24" opacity="0.3"/>
          <path d="M 0 -18 L 4 -5 L 18 0 L 4 5 L 0 18 L -4 5 L -18 0 L -4 -5 Z" fill="#F59E0B"/>
          <ellipse cx="0" cy="0" rx="7" ry="9" fill="#78350F"/>
          <circle cx="2" cy="-2" r="2" fill="#FEF08A"/>
        </g>

        
        <g id="seedBanner" opacity="0">
          <rect x="68" y="102" width="104" height="22" rx="11" fill="#15803D" stroke="#ffffff" stroke-width="1.5"/>
          <text x="120" y="117" fill="#ffffff" font-size="11" font-weight="800" text-anchor="middle">Seed Forms! ✦</text>
        </g>

        
        
        <rect x="156" y="76" width="76" height="25" rx="4" class="badge-bg"/>
        <text x="194" y="89" text-anchor="middle" class="label-text">Pollen Tube</text>
        <text x="194" y="98" text-anchor="middle" class="label-sub">(grows down)</text>
        <polyline points="156,88 136,88 124,96" class="leader-line"/>
        <circle cx="124" cy="96" r="2.5" class="leader-dot"/>

        
        <rect x="8" y="132" width="66" height="25" rx="4" class="badge-bg"/>
        <text x="41" y="145" text-anchor="middle" class="label-text">Ovule</text>
        <text x="41" y="154" text-anchor="middle" class="label-sub">(egg cell)</text>
        <polyline points="74,144 92,144 104,142" class="leader-line"/>
        <circle cx="104" cy="142" r="2.5" class="leader-dot"/>

        
        <rect x="160" y="138" width="72" height="25" rx="4" class="badge-bg"/>
        <text x="196" y="151" text-anchor="middle" class="label-text">Ovary</text>
        <text x="196" y="160" text-anchor="middle" class="label-sub">(becomes fruit)</text>
        <polyline points="160,150 148,150 138,150" class="leader-line"/>
        <circle cx="138" cy="150" r="2.5" class="leader-dot"/>
      </svg>
    </div>
  </div>

  <script>
    // Pure Vanilla JS Animation System (Zero external dependencies)
    const DURATION = 6.0; // Total loop cycle in seconds
    let startTime = performance.now();
    let isPlaying = true;
    let pausedTime = 0;
    let manualTimeOffset = 0;

    // Elements
    const beeGroup = document.getElementById('beeGroup');
    const pollenGrain = document.getElementById('pollenGrain');
    const beePollenLeg = document.getElementById('beePollenLeg');
    const pollenTube = document.getElementById('pollenTube');
    const seedStarburst = document.getElementById('seedStarburst');
    const seedBanner = document.getElementById('seedBanner');
    const playToggle = document.getElementById('playToggle');
    const tabAll = document.getElementById('tabAll');
    const tabPol = document.getElementById('tabPol');
    const tabFert = document.getElementById('tabFert');
    const panelPol = document.getElementById('panelPol');
    const panelFert = document.getElementById('panelFert');

    function lerp(a, b, t) {
      return a + (b - a) * Math.max(0, Math.min(1, t));
    }

    function easeInOutQuad(t) {
      return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
    }

    function easeOutBack(t) {
      const c1 = 1.70158;
      const c3 = c1 + 1;
      return 1 + c3 * Math.pow(t - 1, 3) + c1 * Math.pow(t - 1, 2);
    }

    function render(timeInSec) {
      const t = timeInSec % DURATION;

      // --- 1. POLLINATION ANIMATION (0s -> 2.6s) ---
      if (t < 1.0) {
        // Bee flies towards left anther
        const progress = easeInOutQuad(t / 1.0);
        const bx = lerp(40, 85, progress);
        const by = lerp(42, 80, progress);
        beeGroup.setAttribute('transform', `translate(${bx}, ${by})`);
        beeGroup.style.opacity = '1';

        // Pollen on anther
        pollenGrain.setAttribute('cx', 85);
        pollenGrain.setAttribute('cy', 94);
        pollenGrain.style.opacity = '1';
        beePollenLeg.style.opacity = '0';
      } else if (t < 2.2) {
        // Bee carries pollen to stigma
        const progress = easeInOutQuad((t - 1.0) / 1.2);
        const bx = lerp(85, 120, progress);
        const by = lerp(80, 74, progress);
        beeGroup.setAttribute('transform', `translate(${bx}, ${by})`);
        beeGroup.style.opacity = '1';

        const px = lerp(85, 120, progress);
        const py = lerp(86, 80, progress);
        pollenGrain.setAttribute('cx', px);
        pollenGrain.setAttribute('cy', py);
        pollenGrain.style.opacity = '1';
        beePollenLeg.style.opacity = '1';
      } else if (t < 3.0) {
        // Bee flies away towards top right
        const progress = easeInOutQuad((t - 2.2) / 0.8);
        const bx = lerp(120, 210, progress);
        const by = lerp(74, 30, progress);
        beeGroup.setAttribute('transform', `translate(${bx}, ${by})`);
        beeGroup.style.opacity = (1 - progress * 0.7).toString();

        // Pollen settled on stigma
        pollenGrain.setAttribute('cx', 120);
        pollenGrain.setAttribute('cy', 86);
        pollenGrain.style.opacity = '1';
        beePollenLeg.style.opacity = '0';
      } else {
        // Pollen rests on stigma waiting for cycle reset
        beeGroup.setAttribute('transform', 'translate(40, 42)');
        beeGroup.style.opacity = '1';
        pollenGrain.setAttribute('cx', 120);
        pollenGrain.setAttribute('cy', 86);
        pollenGrain.style.opacity = '1';
        beePollenLeg.style.opacity = '0';
      }

      // --- 2. FERTILISATION ANIMATION (2.5s -> 5.5s) ---
      if (t < 2.5) {
        // Initial state before pollen tube grows
        pollenTube.setAttribute('stroke-dashoffset', '64');
        seedStarburst.setAttribute('opacity', '0');
        seedBanner.setAttribute('opacity', '0');
      } else if (t < 4.2) {
        // Pollen tube growing downwards to ovule
        const progress = easeInOutQuad((t - 2.5) / 1.7);
        const dashOffset = lerp(64, 0, progress);
        pollenTube.setAttribute('stroke-dashoffset', dashOffset.toFixed(1));
        seedStarburst.setAttribute('opacity', '0');
        seedBanner.setAttribute('opacity', '0');
      } else if (t < 5.4) {
        // Fertilisation: Starburst pops & pulses
        pollenTube.setAttribute('stroke-dashoffset', '0');
        const popProgress = Math.min(1, (t - 4.2) / 0.4);
        const scaleVal = easeOutBack(popProgress);
        const pulse = 1 + 0.08 * Math.sin((t - 4.2) * 12);
        const finalScale = scaleVal * pulse;

        seedStarburst.setAttribute('transform', `translate(120, 140) scale(${finalScale})`);
        seedStarburst.setAttribute('opacity', Math.min(1, (t - 4.2) * 3).toString());
        seedBanner.setAttribute('opacity', Math.min(1, (t - 4.3) * 3).toString());
      } else {
        // Hold result until reset
        pollenTube.setAttribute('stroke-dashoffset', '0');
        seedStarburst.setAttribute('transform', 'translate(120, 140) scale(1)');
        seedStarburst.setAttribute('opacity', '1');
        seedBanner.setAttribute('opacity', '1');
      }
    }

    function animate(now) {
      if (isPlaying) {
        const elapsed = (now - startTime) / 1000;
        render(elapsed);
      }
      requestAnimationFrame(animate);
    }
    requestAnimationFrame(animate);

    // Controls and Tab Navigation
    function setActiveTab(btn) {
      [tabAll, tabPol, tabFert].forEach(b => b.classList.remove('active'));
      btn.classList.add('active');
    }

    tabAll.addEventListener('click', () => {
      setActiveTab(tabAll);
      panelPol.style.display = 'flex';
      panelFert.style.display = 'flex';
      if (!isPlaying) togglePlay();
    });

    tabPol.addEventListener('click', () => {
      setActiveTab(tabPol);
      panelPol.style.display = 'flex';
      panelFert.style.display = 'none';
      startTime = performance.now();
      if (!isPlaying) togglePlay();
    });

    tabFert.addEventListener('click', () => {
      setActiveTab(tabFert);
      panelPol.style.display = 'none';
      panelFert.style.display = 'flex';
      startTime = performance.now() - 2500; // Jump to fertilisation start
      if (!isPlaying) togglePlay();
    });

    function togglePlay() {
      if (isPlaying) {
        pausedTime = performance.now();
        isPlaying = false;
        playToggle.textContent = '▶ Play';
      } else {
        startTime += (performance.now() - pausedTime);
        isPlaying = true;
        playToggle.textContent = '⏸ Pause';
      }
    }

    playToggle.addEventListener('click', togglePlay);
  </script>
</body>
</html>

science.ks3

Child standards (2)

Aligned learning resources

Related diagrams