<!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>Fertilisation in Animals</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
      user-select: none;
    }

    .controls {
      display: flex;
      gap: 8px;
      margin-bottom: 10px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .step-btn {
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      background: #ffffff;
      color: #64748b;
      cursor: pointer;
      box-shadow: 0 1px 2px rgba(0,0,0,0.04);
      transition: background-color 0.25s, color 0.25s, box-shadow 0.25s;
    }

    .step-btn.active {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
      box-shadow: 0 2px 8px rgba(37,99,235,0.25);
    }

    .diagram-stage {
      width: 100%;
      max-width: 660px;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    /* Step Card Transitions */
    .step-panel {
      transition: opacity 0.35s ease, filter 0.35s ease;
      cursor: pointer;
    }

    .step-panel.dimmed {
      opacity: 0.35;
      filter: grayscale(40%);
    }

    .step-panel.focused {
      opacity: 1;
      filter: none;
    }

    /* Subtle Animated Elements */
    @keyframes swim {
      0%, 100% { transform: translateX(0px); }
      50% { transform: translateX(4px); }
    }

    @keyframes pulse-shield {
      0%, 100% { stroke-opacity: 0.9; stroke-width: 4px; }
      50% { stroke-opacity: 0.5; stroke-width: 6px; }
    }

    @keyframes gentle-glow {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.03); }
    }

    .swimming-sperm {
      animation: swim 2.4s ease-in-out infinite;
    }

    .shield-ring {
      animation: pulse-shield 2s ease-in-out infinite;
      transform-origin: center;
    }

    .fused-cell {
      animation: gentle-glow 3s ease-in-out infinite;
      transform-origin: center;
    }
  </style>
</head>
<body>

  <div class="controls">
    <button class="step-btn active" id="btn-all" onclick="setStep('all')">All Steps</button>
    <button class="step-btn" id="btn-1" onclick="setStep(1)">1. The Race</button>
    <button class="step-btn" id="btn-2" onclick="setStep(2)">2. The Fusion</button>
    <button class="step-btn" id="btn-3" onclick="setStep(3)">3. One Cell</button>
  </div>

  <div class="diagram-stage">
    <svg viewBox="0 0 660 270" role="img" aria-label="3-step fertilization process">
      <defs>
        
        <marker id="arrow" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
          <path d="M 0 1.5 L 8 5 L 0 8.5 z" fill="#94a3b8" />
        </marker>
        
        
        <filter id="egg-glow" x="-20%" y="-20%" width="140%" height="140%">
          <feDropShadow dx="0" dy="3" stdDeviation="4" flood-color="#ec4899" flood-opacity="0.18" />
        </filter>
        <filter id="shield-glow" x="-30%" y="-30%" width="160%" height="160%">
          <feDropShadow dx="0" dy="0" stdDeviation="5" flood-color="#f97316" flood-opacity="0.5" />
        </filter>
      </defs>

      
      <g class="step-panel focused" id="panel-1" onclick="setStep(1)">
        
        <rect x="10" y="10" width="190" height="250" rx="16" fill="#ffffff" stroke="#e2e8f0" stroke-width="1.5" />
        
        
        <circle cx="145" cy="115" r="42" fill="#fdf2f8" stroke="#ec4899" stroke-width="2.5" filter="url(#egg-glow)" />
        <circle cx="145" cy="115" r="16" fill="#fbcfe8" />
        
        
        <g class="swimming-sperm">
          
          <path d="M 28 85 Q 42 78 54 85 T 78 85" fill="none" stroke="#2563eb" stroke-width="2" stroke-linecap="round" />
          <ellipse cx="84" cy="85" rx="7" ry="4.5" fill="#2563eb" />
          
          
          <path d="M 36 115 Q 52 108 68 115 T 94 115" fill="none" stroke="#2563eb" stroke-width="2" stroke-linecap="round" />
          <ellipse cx="100" cy="115" rx="7.5" ry="5" fill="#2563eb" />
          
          
          <path d="M 30 145 Q 46 152 60 145 T 82 145" fill="none" stroke="#2563eb" stroke-width="2" stroke-linecap="round" />
          <ellipse cx="88" cy="145" rx="7" ry="4.5" fill="#2563eb" />
        </g>

        
        <text x="105" y="210" text-anchor="middle" font-size="14" font-weight="700" fill="#1e2945">1. The Race</text>
        <text x="105" y="230" text-anchor="middle" font-size="12" font-weight="500" fill="#64748b">Many sperm swim</text>
      </g>

      
      <line x1="206" y1="135" x2="228" y2="135" stroke="#94a3b8" stroke-width="3" stroke-linecap="round" marker-end="url(#arrow)" />

      
      <g class="step-panel focused" id="panel-2" onclick="setStep(2)">
        
        <rect x="235" y="10" width="190" height="250" rx="16" fill="#ffffff" stroke="#e2e8f0" stroke-width="1.5" />
        
        
        <circle cx="330" cy="115" r="46" fill="none" stroke="#f97316" stroke-width="4" stroke-dasharray="6 3" class="shield-ring" filter="url(#shield-glow)" />
        
        
        <circle cx="330" cy="115" r="42" fill="#fdf2f8" stroke="#ec4899" stroke-width="2.5" />
        <circle cx="330" cy="115" r="16" fill="#fbcfe8" />
        
        
        <path d="M 270 115 Q 280 110 290 115" fill="none" stroke="#2563eb" stroke-width="2" stroke-linecap="round" />
        <ellipse cx="295" cy="115" rx="7.5" ry="5" fill="#2563eb" />

        
        <g opacity="0.6">
          
          <path d="M 248 68 Q 258 74 270 70" fill="none" stroke="#64748b" stroke-width="1.8" stroke-linecap="round" />
          <ellipse cx="274" cy="70" rx="5.5" ry="3.5" fill="#64748b" transform="rotate(-15 274 70)" />
          
          
          <path d="M 250 162 Q 260 156 272 160" fill="none" stroke="#64748b" stroke-width="1.8" stroke-linecap="round" />
          <ellipse cx="276" cy="160" rx="5.5" ry="3.5" fill="#64748b" transform="rotate(15 276 160)" />
        </g>

        
        <text x="330" y="210" text-anchor="middle" font-size="14" font-weight="700" fill="#1e2945">2. The Fusion</text>
        <text x="330" y="230" text-anchor="middle" font-size="12" font-weight="500" fill="#f97316">Shield locks others out</text>
      </g>

      
      <line x1="431" y1="135" x2="453" y2="135" stroke="#94a3b8" stroke-width="3" stroke-linecap="round" marker-end="url(#arrow)" />

      
      <g class="step-panel focused" id="panel-3" onclick="setStep(3)">
        
        <rect x="460" y="10" width="190" height="250" rx="16" fill="#ffffff" stroke="#e2e8f0" stroke-width="1.5" />
        
        
        <g class="fused-cell">
          <circle cx="555" cy="115" r="44" fill="#fdf4ff" stroke="#a855f7" stroke-width="3" filter="url(#egg-glow)" />
          
          
          <g transform="translate(555, 115)">
            
            <path d="M 0 -18 A 18 18 0 0 0 0 18 Z" fill="#2563eb" opacity="0.85" />
            
            <path d="M 0 -18 A 18 18 0 0 1 0 18 Z" fill="#ec4899" opacity="0.85" />
            
            <line x1="0" y1="-18" x2="0" y2="18" stroke="#ffffff" stroke-width="1.5" stroke-dasharray="2 2" />
          </g>
        </g>

        
        <text x="520" y="75" font-size="12" fill="#a855f7">✦</text>
        <text x="585" y="155" font-size="12" fill="#a855f7">✦</text>

        
        <text x="555" y="210" text-anchor="middle" font-size="14" font-weight="700" fill="#1e2945">3. One New Cell</text>
        <text x="555" y="230" text-anchor="middle" font-size="12" font-weight="500" fill="#a855f7">Combined instructions</text>
      </g>
    </svg>
  </div>

  <script>
    function setStep(step) {
      const panels = [
        document.getElementById('panel-1'),
        document.getElementById('panel-2'),
        document.getElementById('panel-3')
      ];
      const buttons = [
        document.getElementById('btn-all'),
        document.getElementById('btn-1'),
        document.getElementById('btn-2'),
        document.getElementById('btn-3')
      ];

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

      if (step === 'all') {
        buttons[0].classList.add('active');
        panels.forEach(p => {
          p.classList.remove('dimmed');
          p.classList.add('focused');
        });
      } else {
        buttons[step].classList.add('active');
        panels.forEach((p, idx) => {
          if (idx + 1 === step) {
            p.classList.remove('dimmed');
            p.classList.add('focused');
          } else {
            p.classList.remove('focused');
            p.classList.add('dimmed');
          }
        });
      }
    }
  </script>
</body>
</html>

Fertilisation in Animals

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px 10px;
    }

    .flow-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 8px;
      width: 100%;
      max-width: 660px;
      margin: auto 0;
    }

    @media (max-width: 480px) {
      .flow-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
      }
    }

    .stage-card {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 14px;
      padding: 10px 6px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      cursor: pointer;
      position: relative;
      transition: border-color 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
      user-select: none;
    }

    .stage-card.active {
      border-color: #22b7ff;
      background: #f0f9ff;
      box-shadow: 0 0 0 3px rgba(34, 183, 255, 0.25);
    }

    .step-num {
      position: absolute;
      top: 6px;
      left: 8px;
      font-size: 11px;
      font-weight: 800;
      color: #94a3b8;
      background: #f1f5f9;
      border-radius: 6px;
      padding: 2px 5px;
    }

    .stage-card.active .step-num {
      color: #0284c7;
      background: #e0f2fe;
    }

    .art-box {
      width: 100%;
      height: 80px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 14px 0 6px;
    }

    .art-box svg {
      width: 76px;
      height: 76px;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.06));
    }

    .embryo-icon {
      font-size: 46px;
      line-height: 1;
      filter: drop-shadow(0 4px 6px rgba(0,0,0,0.1));
    }

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

    .stage-sub {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
      margin-top: 2px;
    }

    .stage-card.active .stage-sub {
      color: #0284c7;
    }

    .arrow-indicator {
      display: none;
    }

    /* Controls */
    .controls-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      margin: 10px 0 6px;
    }

    .btn-ctrl {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 600;
      color: #1e2945;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }

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

    .dot {
      width: 9px;
      height: 9px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      border: none;
      padding: 0;
      transition: background 0.2s ease;
    }

    .dot.active {
      background: #22b7ff;
    }

    .banner {
      background: #e0f2fe;
      border: 1px solid #bae6fd;
      color: #0369a1;
      font-size: 13px;
      font-weight: 700;
      text-align: center;
      padding: 8px 12px;
      border-radius: 10px;
      width: 100%;
      max-width: 660px;
    }
  </style>
</head>
<body>

  
  <div class="flow-grid" id="flowGrid">
    
    
    <div class="stage-card active" data-step="0">
      <span class="step-num">1</span>
      <div class="art-box">
        <svg viewBox="0 0 100 100">
          <circle cx="50" cy="50" r="38" fill="#38bdf8" fill-opacity="0.2" stroke="#0284c7" stroke-width="4"/>
          <circle cx="50" cy="50" r="16" fill="#818cf8" stroke="#4f46e5" stroke-width="3"/>
          <circle cx="46" cy="46" r="4" fill="#ffffff" opacity="0.8"/>
        </svg>
      </div>
      <div class="stage-label">Day 1</div>
      <div class="stage-sub">1 Cell</div>
    </div>

    
    <div class="stage-card" data-step="1">
      <span class="step-num">2</span>
      <div class="art-box">
        <svg viewBox="0 0 100 100">
          <circle cx="34" cy="50" r="25" fill="#38bdf8" fill-opacity="0.25" stroke="#0284c7" stroke-width="3.5"/>
          <circle cx="34" cy="50" r="10" fill="#818cf8" stroke="#4f46e5" stroke-width="2.5"/>
          <circle cx="66" cy="50" r="25" fill="#38bdf8" fill-opacity="0.25" stroke="#0284c7" stroke-width="3.5"/>
          <circle cx="66" cy="50" r="10" fill="#818cf8" stroke="#4f46e5" stroke-width="2.5"/>
        </svg>
      </div>
      <div class="stage-label">Splits</div>
      <div class="stage-sub">2 Cells</div>
    </div>

    
    <div class="stage-card" data-step="2">
      <span class="step-num">3</span>
      <div class="art-box">
        <svg viewBox="0 0 100 100">
          <circle cx="36" cy="36" r="17" fill="#38bdf8" fill-opacity="0.25" stroke="#0284c7" stroke-width="2.5"/>
          <circle cx="36" cy="36" r="7" fill="#818cf8"/>
          <circle cx="64" cy="36" r="17" fill="#38bdf8" fill-opacity="0.25" stroke="#0284c7" stroke-width="2.5"/>
          <circle cx="64" cy="36" r="7" fill="#818cf8"/>
          <circle cx="36" cy="64" r="17" fill="#38bdf8" fill-opacity="0.25" stroke="#0284c7" stroke-width="2.5"/>
          <circle cx="36" cy="64" r="7" fill="#818cf8"/>
          <circle cx="64" cy="64" r="17" fill="#38bdf8" fill-opacity="0.25" stroke="#0284c7" stroke-width="2.5"/>
          <circle cx="64" cy="64" r="7" fill="#818cf8"/>
        </svg>
      </div>
      <div class="stage-label">Dividing</div>
      <div class="stage-sub">4 → 8 Cells</div>
    </div>

    
    <div class="stage-card" data-step="3">
      <span class="step-num">4</span>
      <div class="art-box">
        <div class="embryo-icon">🐶</div>
      </div>
      <div class="stage-label">Embryo</div>
      <div class="stage-sub">Baby Animal</div>
    </div>

  </div>

  
  <div class="controls-row">
    <button class="btn-ctrl" id="playBtn">⏸ Pause</button>
    <div class="dots-container">
      <button class="dot active" data-step="0" aria-label="Step 1"></button>
      <button class="dot" data-step="1" aria-label="Step 2"></button>
      <button class="dot" data-step="2" aria-label="Step 3"></button>
      <button class="dot" data-step="3" aria-label="Step 4"></button>
    </div>
  </div>

  
  <div class="banner">
    1 cell divides millions of times to make a complete animal!
  </div>

  <script>
    const cards = document.querySelectorAll('.stage-card');
    const dots = document.querySelectorAll('.dot');
    const playBtn = document.getElementById('playBtn');

    let current = 0;
    let playing = true;
    let timer = null;

    function setStep(idx) {
      current = idx;
      cards.forEach((c, i) => c.classList.toggle('active', i === current));
      dots.forEach((d, i) => d.classList.toggle('active', i === current));
    }

    function nextStep() {
      setStep((current + 1) % cards.length);
    }

    function startAuto() {
      if (timer) clearInterval(timer);
      timer = setInterval(nextStep, 2800);
      playing = true;
      playBtn.textContent = '⏸ Pause';
    }

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

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

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

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

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

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      user-select: none;
      -webkit-user-select: none;
    }

    body {
      background-color: #f8f9fa;
      color: #1e2945;
      width: 100%;
      min-height: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 12px;
      gap: 8px;
    }

    /* Controls Bar */
    .controls {
      display: flex;
      gap: 8px;
      background: #e2e8f0;
      padding: 3px;
      border-radius: 20px;
    }

    .tab-btn {
      border: none;
      background: transparent;
      padding: 6px 14px;
      border-radius: 16px;
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      cursor: pointer;
      transition: all 0.25s ease;
    }

    .tab-btn.active {
      background: #ffffff;
      color: #0f172a;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    }

    /* SVG Canvas */
    .canvas-container {
      width: 100%;
      max-width: 600px;
      position: relative;
    }

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

    /* Animations */
    @keyframes swimTail {
      0% {
        d: path("M 160,150 Q 125,130 90,150 T 20,150");
      }
      50% {
        d: path("M 160,150 Q 125,170 90,150 T 20,150");
      }
      100% {
        d: path("M 160,150 Q 125,130 90,150 T 20,150");
      }
    }

    .swimming-tail {
      animation: swimTail 1.2s ease-in-out infinite;
    }

    /* Interactive mode transitions */
    .scale-mode-elem {
      transition: opacity 0.35s ease, transform 0.45s ease;
      transform-origin: center;
    }

    .structure-label {
      transition: opacity 0.3s ease;
    }

    /* Badges */
    .badge-sperm {
      fill: #2563eb;
    }

    .badge-egg {
      fill: #db2777;
    }

    .scale-bar-container {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
      background: #ffffff;
      padding: 5px 12px;
      border-radius: 12px;
      border: 1px solid #e2e8f0;
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <button class="tab-btn active" id="btnStructure" onclick="setMode('structure')">🔍 Structure</button>
    <button class="tab-btn" id="btnScale" onclick="setMode('scale')">⚖️ True Size Ratio</button>
  </div>

  
  <div class="canvas-container">
    <svg viewBox="0 0 600 320">
      <defs>
        
        <radialGradient id="eggGrad" cx="45%" cy="45%" r="55%">
          <stop offset="0%" stop-color="#fff1f2" />
          <stop offset="70%" stop-color="#fce7f3" />
          <stop offset="100%" stop-color="#fbcfe8" />
        </radialGradient>

        <radialGradient id="eggNucleus" cx="40%" cy="40%" r="60%">
          <stop offset="0%" stop-color="#f43f5e" />
          <stop offset="100%" stop-color="#be123c" />
        </radialGradient>

        <linearGradient id="spermHeadGrad" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#60a5fa" />
          <stop offset="100%" stop-color="#1d4ed8" />
        </linearGradient>

        
        <pattern id="jellyPattern" width="12" height="12" patternUnits="userSpaceOnUse">
          <circle cx="6" cy="6" r="1.5" fill="#f472b6" opacity="0.4"/>
        </pattern>
      </defs>

      
      <g id="spermGroup" class="scale-mode-elem">
        
        <g id="spermBadges" class="structure-label">
          <rect x="35" y="16" width="110" height="26" rx="13" class="badge-sperm" />
          <text x="90" y="33" fill="#ffffff" font-size="12" font-weight="700" text-anchor="middle">Sperm Cell</text>
          
          <rect x="30" y="47" width="120" height="20" rx="10" fill="#eff6ff" stroke="#bfdbfe" />
          <text x="90" y="61" fill="#1e40af" font-size="10" font-weight="600" text-anchor="middle">Tiny &amp; Swims fast</text>
        </g>

        
        <g id="spermModel">
          
          <path id="tailPath" class="swimming-tail" fill="none" stroke="#2563eb" stroke-width="3.5" stroke-linecap="round"
                d="M 160,150 Q 125,130 90,150 T 20,150" />

          
          <rect x="156" y="145" width="16" height="10" rx="3" fill="#1d4ed8" />

          
          <ellipse cx="184" cy="150" rx="15" ry="10" fill="url(#spermHeadGrad)" />
          
          
          <ellipse cx="182" cy="150" rx="8" ry="5.5" fill="#ffffff" opacity="0.85" />
        </g>

        
        <g id="spermLabels" class="structure-label">
          
          <line x1="80" y1="150" x2="80" y2="210" stroke="#94a3b8" stroke-dasharray="2 2" stroke-width="1.2"/>
          <circle cx="80" cy="150" r="3" fill="#2563eb" />
          <text x="80" y="226" fill="#475569" font-size="11" font-weight="600" text-anchor="middle">Flagellum (Tail)</text>

          
          <line x1="184" y1="140" x2="184" y2="95" stroke="#94a3b8" stroke-dasharray="2 2" stroke-width="1.2"/>
          <circle cx="184" cy="140" r="3" fill="#2563eb" />
          <text x="184" y="86" fill="#475569" font-size="11" font-weight="600" text-anchor="middle">Head (DNA)</text>
        </g>
      </g>

      
      <line id="centerDivider" class="structure-label" x1="265" y1="30" x2="265" y2="275" stroke="#e2e8f0" stroke-width="1.5" stroke-dasharray="4 4" />

      
      <g id="eggGroup" class="scale-mode-elem">
        
        <g id="eggBadges" class="structure-label">
          <rect x="385" y="16" width="110" height="26" rx="13" class="badge-egg" />
          <text x="440" y="33" fill="#ffffff" font-size="12" font-weight="700" text-anchor="middle">Egg Cell</text>

          <rect x="355" y="47" width="170" height="20" rx="10" fill="#fdf2f8" stroke="#fbcfe8" />
          <text x="440" y="61" fill="#9d174d" font-size="10" font-weight="600" text-anchor="middle">Large &amp; Full of nutrients</text>
        </g>

        
        <g id="eggModel" transform="translate(440, 165)">
          
          <circle cx="0" cy="0" r="92" fill="url(#jellyPattern)" stroke="#f472b6" stroke-width="1.5" stroke-dasharray="3 3"/>
          <circle cx="0" cy="0" r="92" fill="#fdf2f8" opacity="0.35"/>

          
          <circle cx="0" cy="0" r="76" fill="url(#eggGrad)" stroke="#db2777" stroke-width="2.5" />

          
          <g fill="#f472b6" opacity="0.65">
            <circle cx="-35" cy="-25" r="4.5" />
            <circle cx="-45" cy="18" r="3.5" />
            <circle cx="-15" cy="-48" r="4" />
            <circle cx="30" cy="-35" r="4.5" />
            <circle cx="48" cy="-5" r="3.5" />
            <circle cx="38" cy="35" r="5" />
            <circle cx="-25" cy="42" r="4" />
            <circle cx="8" cy="48" r="3.5" />
            <circle cx="-52" cy="-8" r="3" />
            <circle cx="50" cy="-28" r="3" />
            <circle cx="-8" cy="-30" r="3.5" />
            <circle cx="20" cy="-15" r="4" />
            <circle cx="-28" cy="10" r="3" />
            <circle cx="24" cy="22" r="3.5" />
          </g>

          
          <circle cx="0" cy="0" r="22" fill="url(#eggNucleus)" />
          <circle cx="-5" cy="-5" r="6" fill="#ffffff" opacity="0.35" />
        </g>

        
        <g id="eggLabels" class="structure-label">
          
          <line x1="532" y1="165" x2="570" y2="165" stroke="#94a3b8" stroke-dasharray="2 2" stroke-width="1.2"/>
          <circle cx="532" cy="165" r="3" fill="#db2777" />
          <text x="548" y="152" fill="#475569" font-size="10" font-weight="600" text-anchor="middle">Jelly coat</text>

          
          <line x1="405" y1="125" x2="330" y2="125" stroke="#94a3b8" stroke-dasharray="2 2" stroke-width="1.2"/>
          <circle cx="405" cy="125" r="3" fill="#db2777" />
          <text x="330" y="117" fill="#475569" font-size="10" font-weight="600" text-anchor="middle">Food store</text>

          
          <line x1="440" y1="187" x2="440" y2="280" stroke="#94a3b8" stroke-dasharray="2 2" stroke-width="1.2"/>
          <circle cx="440" cy="187" r="3" fill="#db2777" />
          <text x="440" y="295" fill="#475569" font-size="11" font-weight="600" text-anchor="middle">Nucleus (DNA)</text>
        </g>
      </g>

      
      <g id="scaleComparisonInfo" opacity="0" pointer-events="none" style="transition: opacity 0.35s ease;">
        <rect x="50" y="235" width="220" height="50" rx="8" fill="#ffffff" stroke="#cbd5e1" stroke-width="1"/>
        <text x="160" y="256" fill="#0f172a" font-size="11" font-weight="700" text-anchor="middle">Egg is &gt;20× wider</text>
        <text x="160" y="272" fill="#64748b" font-size="10" font-weight="500" text-anchor="middle">Over 1,000× more volume!</text>
      </g>
    </svg>
  </div>

  
  <div class="scale-bar-container">
    <span>🔬</span>
    <span id="scaleText">The egg cell provides all early nutrients; the sperm provides mobility.</span>
  </div>

  <script>
    function setMode(mode) {
      const btnStructure = document.getElementById('btnStructure');
      const btnScale = document.getElementById('btnScale');
      const spermGroup = document.getElementById('spermGroup');
      const eggGroup = document.getElementById('eggGroup');
      const divider = document.getElementById('centerDivider');
      const spermLabels = document.getElementById('spermLabels');
      const eggLabels = document.getElementById('eggLabels');
      const spermBadges = document.getElementById('spermBadges');
      const scaleInfo = document.getElementById('scaleComparisonInfo');
      const scaleText = document.getElementById('scaleText');

      if (mode === 'scale') {
        btnStructure.classList.remove('active');
        btnScale.classList.add('active');

        // Hide structural callout lines & labels
        spermLabels.style.opacity = '0';
        eggLabels.style.opacity = '0';
        divider.style.opacity = '0';
        spermBadges.style.opacity = '0';

        // Shrink sperm to actual proportional size relative to egg
        spermGroup.style.transform = 'translate(140px, 12px) scale(0.18)';
        eggGroup.style.transform = 'translate(-30px, 0px) scale(1.08)';
        
        scaleInfo.style.opacity = '1';
        scaleText.textContent = 'Actual scale: A human egg is visible to the naked eye; sperm is microscopic.';
      } else {
        btnScale.classList.remove('active');
        btnStructure.classList.add('active');

        // Restore structure view
        spermLabels.style.opacity = '1';
        eggLabels.style.opacity = '1';
        divider.style.opacity = '1';
        spermBadges.style.opacity = '1';

        spermGroup.style.transform = 'none';
        eggGroup.style.transform = 'none';

        scaleInfo.style.opacity = '0';
        scaleText.textContent = 'The egg cell provides all early nutrients; the sperm provides mobility.';
      }
    }
  </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>Flower Parts: Stamen vs Carpel</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      width: 100%;
      min-height: 100%;
      background: #ffffff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    /* Header */
    .header {
      text-align: center;
    }
    .header h1 {
      font-size: 17px;
      font-weight: 700;
      color: #1e2945;
    }
    .header p {
      font-size: 13px;
      color: #64748b;
      margin-top: 2px;
    }

    /* 2-Column Grid */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      flex: 1;
    }

    .column-card {
      border-radius: 12px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
    }

    .stamen-card {
      background: #f0f7ff;
      border: 1.5px solid #93c5fd;
    }

    .carpel-card {
      background: #f0fdf4;
      border: 1.5px solid #86efac;
    }

    .col-badge {
      font-size: 13px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
      margin-bottom: 8px;
    }
    .stamen-badge {
      background: #2563eb;
      color: #ffffff;
    }
    .carpel-badge {
      background: #16a34a;
      color: #ffffff;
    }

    /* SVG Area */
    .svg-wrapper {
      width: 100%;
      max-width: 200px;
      height: 180px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    /* Interactive hotspots */
    .hotspot {
      cursor: pointer;
      transition: filter 0.2s ease, opacity 0.2s ease;
    }
    .hotspot:hover {
      filter: brightness(1.15) drop-shadow(0 0 4px rgba(37,99,235,0.4));
    }
    .hotspot.active {
      filter: drop-shadow(0 0 6px #f59e0b) brightness(1.1);
    }

    /* Part selection buttons */
    .button-group {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      justify-content: center;
      margin-top: 6px;
      width: 100%;
    }

    .part-btn {
      background: #ffffff;
      border: 1.5px solid #cbd5e1;
      border-radius: 8px;
      padding: 4px 8px;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: all 0.2s ease;
    }
    .part-btn:hover {
      background: #f8fafc;
      border-color: #94a3b8;
    }
    .part-btn.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
      box-shadow: 0 2px 6px rgba(30, 41, 69, 0.25);
    }

    /* Info Banner */
    .info-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 14px;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .info-header {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .info-title {
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
    }

    .info-badge {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 4px;
      text-transform: uppercase;
    }
    .info-badge.male { background: #dbeafe; color: #1e40af; }
    .info-badge.female { background: #dcfce7; color: #15803d; }

    .info-desc {
      font-size: 13px;
      color: #475569;
      line-height: 1.35;
    }

    .memory-tip {
      font-size: 12px;
      font-weight: 600;
      color: #b45309;
      background: #fef3c7;
      padding: 4px 8px;
      border-radius: 6px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    @media (max-width: 480px) {
      .comparison-grid {
        gap: 8px;
      }
      .svg-wrapper {
        height: 150px;
      }
      .part-btn {
        font-size: 12px;
        padding: 3px 6px;
      }
      .header h1 {
        font-size: 15px;
      }
    }
  </style>
</head>
<body>

  
  <div class="header">
    <h1>Flower Parts: Stamen (♂) vs Carpel (♀)</h1>
    <p>Tap any part to discover what it does!</p>
  </div>

  
  <div class="comparison-grid">

    
    <div class="column-card stamen-card">
      <div class="col-badge stamen-badge">Male: Stamen ♂</div>
      <div class="svg-wrapper">
        <svg viewBox="0 0 160 180">
          <defs>
            <linearGradient id="antherGrad" x1="0" y1="0" x2="1" y2="1">
              <stop offset="0%" stop-color="#fbbf24"/>
              <stop offset="100%" stop-color="#d97706"/>
            </linearGradient>
            <linearGradient id="stemGrad" x1="0" y1="0" x2="1" y2="0">
              <stop offset="0%" stop-color="#86efac"/>
              <stop offset="100%" stop-color="#22c55e"/>
            </linearGradient>
          </defs>

          
          <path d="M 30 170 Q 80 160 130 170 C 130 178 30 178 30 170 Z" fill="#bbf7d0" stroke="#16a34a" stroke-width="1.5"/>

          
          <g id="svg-filament" class="hotspot" onclick="selectPart('filament')">
            <path d="M 80 165 C 75 120 70 85 78 50" fill="none" stroke="url(#stemGrad)" stroke-width="7" stroke-linecap="round"/>
            <path d="M 80 165 C 75 120 70 85 78 50" fill="none" stroke="#15803d" stroke-width="1.5" stroke-linecap="round"/>
          </g>

          
          <g id="svg-anther" class="hotspot" onclick="selectPart('anther')">
            
            <ellipse cx="68" cy="45" rx="14" ry="9" fill="url(#antherGrad)" stroke="#b45309" stroke-width="1.5" transform="rotate(-25 68 45)"/>
            <ellipse cx="88" cy="45" rx="14" ry="9" fill="url(#antherGrad)" stroke="#b45309" stroke-width="1.5" transform="rotate(25 88 45)"/>
            <circle cx="78" cy="46" r="5" fill="#f59e0b"/>

            
            <circle cx="62" cy="38" r="2.5" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
            <circle cx="94" cy="38" r="2.5" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
            <circle cx="78" cy="32" r="2.2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
            <circle cx="56" cy="48" r="2.2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
            <circle cx="100" cy="48" r="2.2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
            <circle cx="70" cy="52" r="2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
            <circle cx="86" cy="52" r="2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
          </g>
        </svg>
      </div>

      
      <div class="button-group">
        <button id="btn-anther" class="part-btn" onclick="selectPart('anther')">🟡 Anther</button>
        <button id="btn-filament" class="part-btn" onclick="selectPart('filament')">🌱 Filament</button>
      </div>
    </div>

    
    <div class="column-card carpel-card">
      <div class="col-badge carpel-badge">Female: Carpel ♀</div>
      <div class="svg-wrapper">
        <svg viewBox="0 0 160 180">
          <defs>
            <linearGradient id="carpelGrad" x1="0" y1="0" x2="1" y2="0">
              <stop offset="0%" stop-color="#bbf7d0"/>
              <stop offset="100%" stop-color="#4ade80"/>
            </linearGradient>
            <radialGradient id="ovuleGrad" cx="35%" cy="35%">
              <stop offset="0%" stop-color="#ffffff"/>
              <stop offset="100%" stop-color="#fef08a"/>
            </radialGradient>
          </defs>

          
          <path d="M 30 170 Q 80 160 130 170 C 130 178 30 178 30 170 Z" fill="#86efac" stroke="#16a34a" stroke-width="1.5"/>

          
          <g id="svg-ovary" class="hotspot" onclick="selectPart('ovary')">
            <path d="M 68 115 Q 40 130 46 160 Q 80 172 114 160 Q 120 130 92 115 Z" fill="url(#carpelGrad)" stroke="#16a34a" stroke-width="1.8"/>
            
            <ellipse cx="80" cy="146" rx="24" ry="17" fill="#dcfce7" stroke="#86efac" stroke-width="1.5"/>
          </g>

          
          <g id="svg-style" class="hotspot" onclick="selectPart('style')">
            <path d="M 72 50 L 70 118 Q 80 120 90 118 L 88 50 Z" fill="url(#carpelGrad)" stroke="#16a34a" stroke-width="1.8"/>
          </g>

          
          <g id="svg-stigma" class="hotspot" onclick="selectPart('stigma')">
            <ellipse cx="80" cy="40" rx="10" ry="6" fill="#15803d" stroke="#14532d" stroke-width="1.5"/>
            <ellipse cx="67" cy="45" rx="8" ry="5" fill="#22c55e" stroke="#15803d" stroke-width="1.5" transform="rotate(-20 67 45)"/>
            <ellipse cx="93" cy="45" rx="8" ry="5" fill="#22c55e" stroke="#15803d" stroke-width="1.5" transform="rotate(20 93 45)"/>
            
            <circle cx="78" cy="38" r="1.8" fill="#ffffff" opacity="0.8"/>
            <circle cx="66" cy="44" r="1.5" fill="#ffffff" opacity="0.8"/>
            <circle cx="94" cy="44" r="1.5" fill="#ffffff" opacity="0.8"/>
          </g>

          
          <g id="svg-ovules" class="hotspot" onclick="selectPart('ovules')">
            <ellipse cx="72" cy="142" rx="5.5" ry="7" fill="url(#ovuleGrad)" stroke="#ca8a04" stroke-width="1.2" transform="rotate(-15 72 142)"/>
            <ellipse cx="88" cy="142" rx="5.5" ry="7" fill="url(#ovuleGrad)" stroke="#ca8a04" stroke-width="1.2" transform="rotate(15 88 142)"/>
            <ellipse cx="80" cy="153" rx="5.5" ry="7" fill="url(#ovuleGrad)" stroke="#ca8a04" stroke-width="1.2"/>
          </g>
        </svg>
      </div>

      
      <div class="button-group">
        <button id="btn-stigma" class="part-btn" onclick="selectPart('stigma')">💧 Stigma</button>
        <button id="btn-style" class="part-btn" onclick="selectPart('style')">🎋 Style</button>
        <button id="btn-ovary" class="part-btn" onclick="selectPart('ovary')">🏺 Ovary</button>
        <button id="btn-ovules" class="part-btn" onclick="selectPart('ovules')">🥚 Ovules</button>
      </div>
    </div>

  </div>

  
  <div class="info-card">
    <div class="info-header">
      <span id="info-icon" style="font-size:18px">🟡</span>
      <span id="info-title" class="info-title">Anther</span>
      <span id="info-badge" class="info-badge male">Male Part</span>
    </div>
    <div id="info-desc" class="info-desc">
      Produces powdery yellow pollen grains (plant sperm cells).
    </div>
    <div class="memory-tip">
      💡 <strong>Memory Tip:</strong> Sta<strong>MEN</strong> makes pollen; Carpel holds the eggs that grow into seeds!
    </div>
  </div>

  <script>
    const partData = {
      anther: {
        title: "Anther",
        gender: "Male Part (Stamen)",
        badgeClass: "male",
        icon: "🟡",
        desc: "Produces powdery yellow pollen grains (the plant's male reproductive cells)."
      },
      filament: {
        title: "Filament",
        gender: "Male Part (Stamen)",
        badgeClass: "male",
        icon: "🌱",
        desc: "A tall, slender stalk that holds the anther high up so visiting insects or wind catch the pollen."
      },
      stigma: {
        title: "Stigma",
        gender: "Female Part (Carpel)",
        badgeClass: "female",
        icon: "💧",
        desc: "The sticky, sweet landing pad at the very top that catches pollen grains from visiting insects."
      },
      style: {
        title: "Style",
        gender: "Female Part (Carpel)",
        badgeClass: "female",
        icon: "🎋",
        desc: "The neck tube connecting the stigma to the ovary. Pollen tubes grow straight down through it."
      },
      ovary: {
        title: "Ovary",
        gender: "Female Part (Carpel)",
        badgeClass: "female",
        icon: "🏺",
        desc: "The swollen protective base that shelters the ovules. After fertilisation, it swells into fruit!"
      },
      ovules: {
        title: "Ovules",
        gender: "Female Part (Carpel)",
        badgeClass: "female",
        icon: "🥚",
        desc: "The plant's tiny eggs. When fertilised by pollen, they grow into seeds ready to plant!"
      }
    };

    function selectPart(partId) {
      const data = partData[partId];
      if (!data) return;

      // Update Info Banner
      document.getElementById('info-icon').textContent = data.icon;
      document.getElementById('info-title').textContent = data.title;
      document.getElementById('info-badge').textContent = data.gender;
      document.getElementById('info-badge').className = 'info-badge ' + data.badgeClass;
      document.getElementById('info-desc').textContent = data.desc;

      // Update Button active states
      document.querySelectorAll('.part-btn').forEach(btn => btn.classList.remove('active'));
      const activeBtn = document.getElementById('btn-' + partId);
      if (activeBtn) activeBtn.classList.add('active');

      // Update SVG hotspots active states
      document.querySelectorAll('.hotspot').forEach(el => el.classList.remove('active'));
      const activeSvg = document.getElementById('svg-' + partId);
      if (activeSvg) activeSvg.classList.add('active');
    }

    // Initialize with Anther selected
    selectPart('anther');
  </script>
</body>
</html>

Plant Flowers and Reproduction Parts

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="1:1">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      height: 100vh;
      min-height: 380px;
      max-height: 500px;
      padding: 12px 16px;
      user-select: none;
    }

    /* Top Bar */
    .top-bar {
      width: 100%;
      max-width: 440px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .title {
      font-size: 14px;
      font-weight: 700;
      color: #0f172a;
      letter-spacing: -0.2px;
    }
    .badge {
      font-size: 13px;
      font-weight: 700;
      background: #e2e8f0;
      color: #475569;
      padding: 4px 10px;
      border-radius: 999px;
      transition: background 0.3s ease, color 0.3s ease;
    }
    .badge.complete {
      background: #dcfce7;
      color: #15803d;
    }

    /* Diagram Area */
    .diagram-stage {
      position: relative;
      width: 100%;
      max-width: 420px;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    svg {
      width: 100%;
      height: 100%;
      max-height: 330px;
      overflow: visible;
    }

    /* Hotspot markers */
    .hotspot {
      cursor: pointer;
      outline: none;
    }
    .hotspot-ring {
      fill: none;
      stroke: #2563eb;
      stroke-width: 2.5;
      opacity: 0.8;
      animation: pulse 2.2s infinite ease-out;
      transform-origin: center;
    }
    .hotspot-core {
      fill: #2563eb;
      transition: transform 0.2s ease, fill 0.2s ease;
      transform-origin: center;
    }
    .hotspot-num {
      fill: #ffffff;
      font-size: 12px;
      font-weight: 800;
      text-anchor: middle;
      dominant-baseline: central;
      pointer-events: none;
    }
    .hotspot.inspected .hotspot-core {
      fill: #16a34a;
    }
    .hotspot.inspected .hotspot-ring {
      stroke: #16a34a;
      animation: none;
      opacity: 0.3;
    }
    .hotspot.active .hotspot-core {
      fill: #0284c7;
      filter: drop-shadow(0 0 6px rgba(2,132,199,0.7));
    }

    @keyframes pulse {
      0% { r: 12; opacity: 0.9; }
      70% { r: 24; opacity: 0; }
      100% { r: 24; opacity: 0; }
    }

    /* Info card at bottom */
    .info-card {
      width: 100%;
      max-width: 440px;
      min-height: 52px;
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      font-size: 14px;
      font-weight: 600;
      color: #334155;
      box-shadow: 0 2px 6px rgba(0,0,0,0.04);
      transition: border-color 0.2s ease;
    }
    .info-card.highlight {
      border-color: #38bdf8;
      color: #0f172a;
    }
    .info-term {
      color: #0284c7;
      font-weight: 800;
      margin-right: 4px;
    }

    /* Highlight glows on SVG flower parts */
    .flower-part {
      transition: filter 0.3s ease, opacity 0.3s ease;
    }
    .flower-part.glow {
      filter: drop-shadow(0 0 8px #fde047);
    }
    .ovule {
      transition: transform 0.3s ease;
    }
    .glow-ovule .ovule {
      animation: bounce 0.8s ease infinite alternate;
    }
    @keyframes bounce {
      from { transform: scale(1); }
      to { transform: scale(1.25); }
    }
  </style>
</head>
<body>

  <div class="top-bar">
    <div class="title">Lily Flower Anatomy</div>
    <div id="counter" class="badge">Inspected: 0/3</div>
  </div>

  <div class="diagram-stage">
    <svg viewBox="0 0 400 320" preserveAspectRatio="xMidYMid meet">
      <defs>
        
        <linearGradient id="petalGrad1" x1="0%" y1="100%" x2="0%" y2="0%">
          <stop offset="0%" stop-color="#fbcfe8"/>
          <stop offset="40%" stop-color="#fdf2f8"/>
          <stop offset="100%" stop-color="#ffffff"/>
        </linearGradient>
        <linearGradient id="petalGrad2" x1="0%" y1="100%" x2="0%" y2="0%">
          <stop offset="0%" stop-color="#f472b6"/>
          <stop offset="60%" stop-color="#fce7f3"/>
          <stop offset="100%" stop-color="#fff1f2"/>
        </linearGradient>
        <linearGradient id="stemGrad" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#15803d"/>
          <stop offset="50%" stop-color="#22c55e"/>
          <stop offset="100%" stop-color="#166534"/>
        </linearGradient>
        <linearGradient id="antherGrad" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#facc15"/>
          <stop offset="100%" stop-color="#ca8a04"/>
        </linearGradient>
        <linearGradient id="styleGrad" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#86efac"/>
          <stop offset="50%" stop-color="#bbf7d0"/>
          <stop offset="100%" stop-color="#4ade80"/>
        </linearGradient>
      </defs>

      
      <path d="M 195 285 Q 197 315 200 320 Q 203 315 205 285 Z" fill="url(#stemGrad)"/>
      <ellipse cx="200" cy="285" rx="20" ry="8" fill="#15803d"/>

      
      <path d="M 200 270 Q 110 210 80 110 Q 140 130 190 250 Z" fill="url(#petalGrad1)" opacity="0.95"/>
      <path d="M 200 270 Q 290 210 320 110 Q 260 130 210 250 Z" fill="url(#petalGrad1)" opacity="0.95"/>
      <path d="M 200 270 Q 200 120 200 50 Q 230 120 205 260 Z" fill="url(#petalGrad1)" opacity="0.9"/>
      <path d="M 200 270 Q 170 120 200 50 Q 170 120 195 260 Z" fill="url(#petalGrad1)" opacity="0.9"/>

      
      <path d="M 200 275 Q 70 260 40 190 Q 120 190 190 270 Z" fill="url(#petalGrad2)"/>
      <path d="M 200 275 Q 330 260 360 190 Q 280 190 210 270 Z" fill="url(#petalGrad2)"/>

      
      
      <path d="M 195 260 Q 140 210 115 110" fill="none" stroke="#bbf7d0" stroke-width="3.5" stroke-linecap="round"/>
      
      <path d="M 192 260 Q 110 220 75 145" fill="none" stroke="#bbf7d0" stroke-width="3" stroke-linecap="round"/>
      
      <path d="M 205 260 Q 260 210 285 110" fill="none" stroke="#bbf7d0" stroke-width="3.5" stroke-linecap="round"/>
      
      <path d="M 208 260 Q 290 220 325 145" fill="none" stroke="#bbf7d0" stroke-width="3" stroke-linecap="round"/>

      
      <g transform="translate(75, 145) rotate(-35)">
        <rect x="-6" y="-12" width="12" height="24" rx="6" fill="url(#antherGrad)"/>
      </g>
      <g transform="translate(285, 110) rotate(25)">
        <rect x="-6" y="-12" width="12" height="24" rx="6" fill="url(#antherGrad)"/>
      </g>
      <g transform="translate(325, 145) rotate(35)">
        <rect x="-6" y="-12" width="12" height="24" rx="6" fill="url(#antherGrad)"/>
      </g>

      
      
      <path d="M 200 260 L 200 75" fill="none" stroke="url(#styleGrad)" stroke-width="8" stroke-linecap="round"/>

      
      <g id="part-ovary" class="flower-part">
        
        <ellipse cx="200" cy="255" rx="20" ry="24" fill="#22c55e"/>
        
        <ellipse cx="200" cy="255" rx="14" ry="18" fill="#14532d"/>
        
        <g id="ovulesGroup" class="ovule-container">
          <circle class="ovule" cx="194" cy="245" r="3.2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
          <circle class="ovule" cx="206" cy="245" r="3.2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
          <circle class="ovule" cx="194" cy="255" r="3.2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
          <circle class="ovule" cx="206" cy="255" r="3.2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
          <circle class="ovule" cx="194" cy="265" r="3.2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
          <circle class="ovule" cx="206" cy="265" r="3.2" fill="#fef08a" stroke="#ca8a04" stroke-width="0.8"/>
        </g>
      </g>

      
      <g id="part-stigma" class="flower-part" transform="translate(200, 68)">
        
        <circle cx="-6" cy="-4" r="6.5" fill="#4ade80" stroke="#16a34a" stroke-width="1"/>
        <circle cx="6" cy="-4" r="6.5" fill="#4ade80" stroke="#16a34a" stroke-width="1"/>
        <circle cx="0" cy="4" r="6.5" fill="#22c55e" stroke="#16a34a" stroke-width="1"/>
        
        <circle cx="-5" cy="-5" r="1.5" fill="#ffffff" opacity="0.8"/>
        <circle cx="5" cy="-5" r="1.5" fill="#ffffff" opacity="0.8"/>
        <circle cx="0" cy="3" r="1.5" fill="#ffffff" opacity="0.8"/>
      </g>

      
      <g id="part-anther" class="flower-part" transform="translate(115, 110) rotate(-25)">
        <rect x="-8" y="-15" width="16" height="30" rx="8" fill="url(#antherGrad)" stroke="#a16207" stroke-width="1"/>
        
        <circle cx="-3" cy="-8" r="1.5" fill="#713f12" opacity="0.7"/>
        <circle cx="3" cy="-5" r="1.3" fill="#713f12" opacity="0.7"/>
        <circle cx="-2" cy="0" r="1.5" fill="#713f12" opacity="0.7"/>
        <circle cx="4" cy="5" r="1.4" fill="#713f12" opacity="0.7"/>
        <circle cx="-3" cy="8" r="1.2" fill="#713f12" opacity="0.7"/>
        <circle cx="1" cy="11" r="1.4" fill="#713f12" opacity="0.7"/>
      </g>

      
      
      <g id="spot-anther" class="hotspot" tabindex="0" role="button" aria-label="Inspect Anther" transform="translate(115, 110)">
        <circle class="hotspot-ring" cx="0" cy="0" r="14"/>
        <circle class="hotspot-core" cx="0" cy="0" r="12"/>
        <text class="hotspot-num" x="0" y="0">1</text>
      </g>

      
      <g id="spot-stigma" class="hotspot" tabindex="0" role="button" aria-label="Inspect Stigma" transform="translate(200, 68)">
        <circle class="hotspot-ring" cx="0" cy="0" r="14"/>
        <circle class="hotspot-core" cx="0" cy="0" r="12"/>
        <text class="hotspot-num" x="0" y="0">2</text>
      </g>

      
      <g id="spot-ovary" class="hotspot" tabindex="0" role="button" aria-label="Inspect Ovary" transform="translate(200, 255)">
        <circle class="hotspot-ring" cx="0" cy="0" r="14"/>
        <circle class="hotspot-core" cx="0" cy="0" r="12"/>
        <text class="hotspot-num" x="0" y="0">3</text>
      </g>
    </svg>
  </div>

  <div id="infoCard" class="info-card">
    Tap an inspection point (1–3) to explore
  </div>

  <script>
    const inspected = new Set();
    const totalPoints = 3;

    const data = {
      anther: {
        elemId: 'part-anther',
        spotId: 'spot-anther',
        text: '<span class="info-term">Anther:</span> dusty with pollen',
        freq: 580
      },
      stigma: {
        elemId: 'part-stigma',
        spotId: 'spot-stigma',
        text: '<span class="info-term">Stigma:</span> sticky pad to trap pollen',
        freq: 660
      },
      ovary: {
        elemId: 'part-ovary',
        spotId: 'spot-ovary',
        text: '<span class="info-term">Ovary:</span> holds 6 ovules for seeds',
        freq: 760
      }
    };

    function playTone(freq) {
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.type = 'sine';
        osc.frequency.setValueAtTime(freq, ctx.currentTime);
        gain.gain.setValueAtTime(0.15, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + 0.25);
        osc.connect(gain);
        gain.connect(ctx.destination);
        osc.start();
        osc.stop(ctx.currentTime + 0.25);
      } catch (e) {}
    }

    function inspect(key) {
      const item = data[key];
      if (!item) return;

      // Play soft feedback tone
      playTone(item.freq);

      // Track inspection
      inspected.add(key);

      // Update active styling
      document.querySelectorAll('.hotspot').forEach(el => el.classList.remove('active'));
      document.querySelectorAll('.flower-part').forEach(el => {
        el.classList.remove('glow');
        el.classList.remove('glow-ovule');
      });

      const hotspotEl = document.getElementById(item.spotId);
      const partEl = document.getElementById(item.elemId);
      
      hotspotEl.classList.add('inspected', 'active');
      partEl.classList.add('glow');
      if (key === 'ovary') partEl.classList.add('glow-ovule');

      // Update text
      const infoCard = document.getElementById('infoCard');
      infoCard.innerHTML = item.text;
      infoCard.classList.add('highlight');

      // Update counter
      const counter = document.getElementById('counter');
      const count = inspected.size;
      counter.textContent = `Inspected: ${count}/${totalPoints}`;
      if (count === totalPoints) {
        counter.classList.add('complete');
        counter.textContent = `All inspected ✓ (3/3)`;
      }
    }

    // Attach listeners
    Object.keys(data).forEach(key => {
      const spot = document.getElementById(data[key].spotId);
      spot.addEventListener('click', () => inspect(key));
      spot.addEventListener('keydown', (e) => {
        if (e.key === 'Enter' || e.key === ' ') {
          e.preventDefault();
          inspect(key);
        }
      });
    });
  </script>
</body>
</html>

science.ks3.y1.t1.s2

Aligned learning resources

Related diagrams