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

    .diagram-wrap {
      width: 100%;
      max-width: 520px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
    }

    /* Interactive filter buttons */
    .controls {
      display: flex;
      gap: 8px;
      margin-bottom: 8px;
      z-index: 10;
    }
    .btn {
      padding: 5px 12px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 20px;
      border: 1px solid #cbd5e1;
      background: #f8fafc;
      color: #475569;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .btn.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
    }
    .btn.xylem-btn.active {
      background: #0284c7;
      border-color: #0284c7;
    }
    .btn.phloem-btn.active {
      background: #ea580c;
      border-color: #ea580c;
    }

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

    /* Dynamic highlighting */
    .dimmed {
      opacity: 0.18;
      transition: opacity 0.3s ease;
    }
    .highlighted {
      opacity: 1;
      transition: opacity 0.3s ease;
    }

    /* Flow Animations */
    @keyframes flowUp {
      from { stroke-dashoffset: 40; }
      to { stroke-dashoffset: 0; }
    }
    @keyframes flowDown {
      from { stroke-dashoffset: 0; }
      to { stroke-dashoffset: 40; }
    }

    .animate-up {
      stroke-dasharray: 6, 6;
      animation: flowUp 1.2s linear infinite;
    }
    .animate-bidir-up {
      stroke-dasharray: 5, 5;
      animation: flowUp 1.6s linear infinite;
    }
    .animate-bidir-down {
      stroke-dasharray: 5, 5;
      animation: flowDown 1.6s linear infinite;
    }

    .label-badge {
      font-size: 12px;
      font-weight: 700;
      fill: #1e2945;
    }
    .sub-badge {
      font-size: 10px;
      font-weight: 600;
    }
  </style>
</head>
<body>

<div class="diagram-wrap">
  <div class="controls">
    <button class="btn active" id="btn-all" onclick="setView('all')">All</button>
    <button class="btn xylem-btn" id="btn-xylem" onclick="setView('xylem')">Xylem</button>
    <button class="btn phloem-btn" id="btn-phloem" onclick="setView('phloem')">Phloem</button>
  </div>

  <svg viewBox="0 0 500 370" xmlns="http://www.w3.org/2000/svg">
    <defs>
      
      <linearGradient id="stemCylinder" x1="0%" y1="0%" x2="100%" y2="0%">
        <stop offset="0%" stop-color="#15803d"/>
        <stop offset="35%" stop-color="#22c55e"/>
        <stop offset="80%" stop-color="#16a34a"/>
        <stop offset="100%" stop-color="#14532d"/>
      </linearGradient>
      
      <linearGradient id="cutFace" x1="0%" y1="0%" x2="0%" y2="100%">
        <stop offset="0%" stop-color="#f0fdf4"/>
        <stop offset="100%" stop-color="#dcfce7"/>
      </linearGradient>

      
      <linearGradient id="xylemGrad" x1="0%" y1="0%" x2="100%" y2="0%">
        <stop offset="0%" stop-color="#0284c7"/>
        <stop offset="100%" stop-color="#38bdf8"/>
      </linearGradient>

      
      <linearGradient id="phloemGrad" x1="0%" y1="0%" x2="100%" y2="0%">
        <stop offset="0%" stop-color="#ea580c"/>
        <stop offset="100%" stop-color="#fb923c"/>
      </linearGradient>

      
      <marker id="arrow-blue" viewBox="0 0 10 10" refX="5" refY="5" markerWidth="4" markerHeight="4" orient="auto-start-reverse">
        <path d="M 0 1.5 L 8 5 L 0 8.5 z" fill="#0284c7"/>
      </marker>
      <marker id="arrow-orange-up" viewBox="0 0 10 10" refX="5" refY="5" markerWidth="4" markerHeight="4" orient="auto-start-reverse">
        <path d="M 0 1.5 L 8 5 L 0 8.5 z" fill="#ea580c"/>
      </marker>
      <marker id="arrow-orange-down" viewBox="0 0 10 10" refX="5" refY="5" markerWidth="4" markerHeight="4" orient="auto-start-reverse">
        <path d="M 0 1.5 L 8 5 L 0 8.5 z" fill="#ea580c"/>
      </marker>
    </defs>

    
    <g id="stem-base">
      
      <path d="M 90,140 L 90,260 C 90,305 310,305 310,260 L 310,140 Z" fill="url(#stemCylinder)" />
      
      
      <path d="M 90,180 C 120,215 280,215 310,180" fill="none" stroke="#15803d" stroke-width="2" opacity="0.6"/>
      <path d="M 90,220 C 120,255 280,255 310,220" fill="none" stroke="#15803d" stroke-width="2" opacity="0.6"/>

      
      <ellipse cx="200" cy="140" rx="110" ry="46" fill="url(#cutFace)" stroke="#16a34a" stroke-width="4"/>

      
      <ellipse cx="200" cy="140" rx="42" ry="18" fill="#dcfce7" stroke="#bbf7d0" stroke-width="2"/>

      
      <g opacity="0.5">
        <ellipse cx="125" cy="140" rx="7" ry="12" fill="#0284c7" />
        <ellipse cx="145" cy="116" rx="9" ry="7" fill="#0284c7" />
        <ellipse cx="255" cy="116" rx="9" ry="7" fill="#0284c7" />
        <ellipse cx="275" cy="140" rx="7" ry="12" fill="#0284c7" />
        <ellipse cx="245" cy="164" rx="9" ry="7" fill="#0284c7" />
        <ellipse cx="155" cy="164" rx="9" ry="7" fill="#0284c7" />
      </g>
    </g>

    
    
    <g id="grp-xylem">
      
      <path d="M 176,145 C 185,147 195,147 204,145 L 204,265 C 195,268 185,268 176,265 Z" fill="url(#xylemGrad)" opacity="0.9"/>
      <ellipse cx="190" cy="145" rx="14" ry="5" fill="#38bdf8"/>
      
      
      <line x1="184" y1="255" x2="184" y2="155" stroke="#ffffff" stroke-width="2.5" class="animate-up" stroke-linecap="round"/>
      <line x1="196" y1="255" x2="196" y2="155" stroke="#ffffff" stroke-width="2.5" class="animate-up" stroke-linecap="round"/>
      
      
      <path d="M 190,205 L 190,175" stroke="#0284c7" stroke-width="3" marker-end="url(#arrow-blue)"/>
    </g>

    
    <g id="grp-phloem">
      
      <path d="M 196,148 C 208,151 220,151 232,148 L 232,268 C 220,272 208,272 196,268 Z" fill="url(#phloemGrad)" opacity="0.95"/>
      <ellipse cx="214" cy="148" rx="18" ry="6" fill="#fb923c"/>
      
      
      <line x1="206" y1="258" x2="206" y2="158" stroke="#ffffff" stroke-width="2.5" class="animate-bidir-up" stroke-linecap="round"/>
      <line x1="222" y1="158" x2="222" y2="258" stroke="#ffffff" stroke-width="2.5" class="animate-bidir-down" stroke-linecap="round"/>
      
      
      <path d="M 214,215 L 214,185" stroke="#ea580c" stroke-width="2.5" marker-end="url(#arrow-orange-up)"/>
      <path d="M 214,195 L 214,225" stroke="#ea580c" stroke-width="2.5" marker-end="url(#arrow-orange-down)"/>
    </g>

    

    
    <g id="grp-epidermis">
      <path d="M 90,200 L 40,200" fill="none" stroke="#15803d" stroke-width="1.5" stroke-dasharray="2,2"/>
      <circle cx="90" cy="200" r="3.5" fill="#15803d"/>
      <rect x="5" y="186" width="70" height="26" rx="6" fill="#f0fdf4" stroke="#16a34a" stroke-width="1.5"/>
      <text x="40" y="203" text-anchor="middle" class="label-badge" fill="#15803d">Epidermis</text>
    </g>

    
    <g id="label-xylem">
      <path d="M 180,210 L 130,265 L 105,265" fill="none" stroke="#0284c7" stroke-width="1.5"/>
      <circle cx="180" cy="210" r="3.5" fill="#0284c7"/>
      
      <rect x="5" y="270" width="170" height="48" rx="8" fill="#f0f9ff" stroke="#0284c7" stroke-width="1.5"/>
      <text x="16" y="290" class="label-badge" fill="#0369a1">Xylem</text>
      <text x="16" y="306" class="sub-badge" fill="#0284c7">Water &amp; Minerals (One-way Up)</text>
    </g>

    
    <g id="label-phloem">
      <path d="M 228,210 L 285,265 L 320,265" fill="none" stroke="#ea580c" stroke-width="1.5"/>
      <circle cx="228" cy="210" r="3.5" fill="#ea580c"/>
      
      <rect x="305" y="270" width="185" height="48" rx="8" fill="#fff7ed" stroke="#ea580c" stroke-width="1.5"/>
      <text x="316" y="290" class="label-badge" fill="#c2410c">Phloem</text>
      <text x="316" y="306" class="sub-badge" fill="#ea580c">Sugars &amp; Food (Two-way Flow)</text>
    </g>

    
    <path d="M 176,132 C 176,124 204,124 204,124 C 204,124 232,124 232,132" fill="none" stroke="#64748b" stroke-width="1.5"/>
    <path d="M 204,124 L 204,108" fill="none" stroke="#64748b" stroke-width="1.5"/>
    <rect x="150" y="86" width="110" height="22" rx="4" fill="#ffffff" stroke="#cbd5e1" stroke-width="1"/>
    <text x="205" y="101" text-anchor="middle" class="label-badge" font-size="11" fill="#475569">Vascular Bundle</text>

  </svg>
</div>

<script>
  function setView(view) {
    document.querySelectorAll('.btn').forEach(b => b.classList.remove('active'));
    
    const gx = document.getElementById('grp-xylem');
    const gp = document.getElementById('grp-phloem');
    const lx = document.getElementById('label-xylem');
    const lp = document.getElementById('label-phloem');
    const ep = document.getElementById('grp-epidermis');
    const st = document.getElementById('stem-base');

    if (view === 'xylem') {
      document.getElementById('btn-xylem').classList.add('active');
      gx.className.baseVal = 'highlighted';
      lx.className.baseVal = 'highlighted';
      gp.className.baseVal = 'dimmed';
      lp.className.baseVal = 'dimmed';
      ep.className.baseVal = 'dimmed';
      st.className.baseVal = 'dimmed';
    } else if (view === 'phloem') {
      document.getElementById('btn-phloem').classList.add('active');
      gp.className.baseVal = 'highlighted';
      lp.className.baseVal = 'highlighted';
      gx.className.baseVal = 'dimmed';
      lx.className.baseVal = 'dimmed';
      ep.className.baseVal = 'dimmed';
      st.className.baseVal = 'dimmed';
    } else {
      document.getElementById('btn-all').classList.add('active');
      gx.className.baseVal = 'highlighted';
      gp.className.baseVal = 'highlighted';
      lx.className.baseVal = 'highlighted';
      lp.className.baseVal = 'highlighted';
      ep.className.baseVal = 'highlighted';
      st.className.baseVal = 'highlighted';
    }
  }
</script>

</body>
</html>

Plant Organs: Roots, Stems, and Leaves

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      width: 100%;
      padding: 8px;
      user-select: none;
    }
    .wrapper {
      width: 100%;
      max-width: 580px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }
    .controls {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .btn:hover {
      background: #e2e8f0;
    }
    .btn.active {
      background: #0284c7;
      color: #ffffff;
      border-color: #0284c7;
    }
    svg {
      width: 100%;
      height: auto;
      display: block;
      overflow: visible;
    }
    .sun-beam {
      animation: pulseLight 3s infinite ease-in-out;
    }
    @keyframes pulseLight {
      0%, 100% { opacity: 0.25; }
      50% { opacity: 0.7; }
    }
    .gas-flow {
      stroke-dasharray: 6, 6;
      animation: dashFlow 3s linear infinite;
    }
    @keyframes dashFlow {
      to { stroke-dashoffset: -24; }
    }
    .gas-flow-out {
      stroke-dasharray: 6, 6;
      animation: dashFlowOut 3s linear infinite;
    }
    @keyframes dashFlowOut {
      to { stroke-dashoffset: 24; }
    }
    .label {
      font-size: 11px;
      font-weight: 700;
      fill: #334155;
    }
    .sublabel {
      font-size: 9px;
      font-weight: 600;
      fill: #64748b;
    }
    .layer-group {
      transition: opacity 0.3s ease;
    }
    .dimmed {
      opacity: 0.2;
    }
  </style>
</head>
<body>
  <div class="wrapper">
    <div class="controls">
      <button class="btn active" onclick="setMode('all', this)">All Layers</button>
      <button class="btn" onclick="setMode('sun', this)">☀️ Sunlight & Palisade</button>
      <button class="btn" onclick="setMode('gas', this)">💨 Gas Exchange</button>
      <button class="btn" onclick="setMode('vein', this)">💧 Vein Bundle</button>
    </div>

    <svg viewBox="0 0 540 370">
      <defs>
        
        <linearGradient id="sunGrad" x1="0" y1="0" x2="0.3" y2="1">
          <stop offset="0%" stop-color="#fde047" stop-opacity="0.8"/>
          <stop offset="100%" stop-color="#fde047" stop-opacity="0.05"/>
        </linearGradient>

        
        <linearGradient id="xylemGrad" x1="0" y1="0" x2="1" y2="1">
          <stop offset="0%" stop-color="#93c5fd"/>
          <stop offset="100%" stop-color="#3b82f6"/>
        </linearGradient>
        <linearGradient id="phloemGrad" x1="0" y1="0" x2="1" y2="1">
          <stop offset="0%" stop-color="#fed7aa"/>
          <stop offset="100%" stop-color="#f97316"/>
        </linearGradient>

        
        <marker id="arrow-co2" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="5" markerHeight="5" orient="auto-start-reverse">
          <path d="M 0 1 L 8 5 L 0 9 z" fill="#0284c7"/>
        </marker>
        <marker id="arrow-o2" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="5" markerHeight="5" orient="auto-start-reverse">
          <path d="M 0 1 L 8 5 L 0 9 z" fill="#16a34a"/>
        </marker>
        <marker id="arrow-h2o" viewBox="0 0 10 10" refX="6" refY="5" markerWidth="5" markerHeight="5" orient="auto-start-reverse">
          <path d="M 0 1 L 8 5 L 0 9 z" fill="#0284c7"/>
        </marker>
      </defs>

      
      <g id="sun-layer" class="layer-group">
        <polygon points="40,0 80,0 150,140 100,140" fill="url(#sunGrad)" class="sun-beam" />
        <polygon points="120,0 170,0 260,140 190,140" fill="url(#sunGrad)" class="sun-beam" />
        <polygon points="210,0 260,0 360,140 290,140" fill="url(#sunGrad)" class="sun-beam" />
        <text x="75" y="16" fill="#ca8a04" font-size="11" font-weight="700">☀️ Sunlight</text>
      </g>

      
      <g id="cuticle-top" class="layer-group">
        <rect x="25" y="32" width="370" height="7" rx="3.5" fill="#fef08a" opacity="0.85" stroke="#eab308" stroke-width="1.2"/>
        <text x="402" y="38" class="label">Cuticle</text>
        <text x="402" y="47" class="sublabel">Waxy barrier</text>
      </g>

      
      <g id="epidermis-top" class="layer-group">
        <g fill="#ecfdf5" stroke="#10b981" stroke-width="1.2">
          <rect x="25" y="42" width="44" height="26" rx="4"/>
          <rect x="72" y="42" width="44" height="26" rx="4"/>
          <rect x="119" y="42" width="44" height="26" rx="4"/>
          <rect x="166" y="42" width="44" height="26" rx="4"/>
          <rect x="213" y="42" width="44" height="26" rx="4"/>
          <rect x="260" y="42" width="44" height="26" rx="4"/>
          <rect x="307" y="42" width="44" height="26" rx="4"/>
          <rect x="354" y="42" width="41" height="26" rx="4"/>
        </g>
        <text x="402" y="58" class="label">Upper Epidermis</text>
      </g>

      
      <g id="palisade-group" class="layer-group">
        
        <g fill="#bbf7d0" stroke="#16a34a" stroke-width="1.2">
          
          <rect x="26" y="72" width="22" height="78" rx="6"/>
          
          <rect x="51" y="72" width="22" height="78" rx="6"/>
          
          <rect x="76" y="72" width="22" height="78" rx="6"/>
          
          <rect x="101" y="72" width="22" height="78" rx="6"/>
          
          <rect x="126" y="72" width="22" height="78" rx="6"/>
          
          <rect x="151" y="72" width="22" height="78" rx="6"/>
          
          <rect x="176" y="72" width="22" height="78" rx="6"/>
          
          <rect x="201" y="72" width="22" height="78" rx="6"/>
          
          <rect x="226" y="72" width="22" height="78" rx="6"/>
          
          <rect x="251" y="72" width="22" height="78" rx="6"/>
          
          <rect x="276" y="72" width="22" height="78" rx="6"/>
          
          <rect x="301" y="72" width="22" height="78" rx="6"/>
          
          <rect x="326" y="72" width="22" height="78" rx="6"/>
          
          <rect x="351" y="72" width="22" height="78" rx="6"/>
          
          <rect x="375" y="72" width="20" height="78" rx="6"/>
        </g>
        
        <g fill="#15803d">
          <circle cx="37" cy="85" r="2.5"/><circle cx="37" cy="105" r="2.5"/><circle cx="37" cy="125" r="2.5"/><circle cx="37" cy="140" r="2.5"/>
          <circle cx="62" cy="82" r="2.5"/><circle cx="62" cy="100" r="2.5"/><circle cx="62" cy="120" r="2.5"/><circle cx="62" cy="138" r="2.5"/>
          <circle cx="87" cy="85" r="2.5"/><circle cx="87" cy="105" r="2.5"/><circle cx="87" cy="125" r="2.5"/><circle cx="87" cy="140" r="2.5"/>
          <circle cx="112" cy="82" r="2.5"/><circle cx="112" cy="100" r="2.5"/><circle cx="112" cy="120" r="2.5"/><circle cx="112" cy="138" r="2.5"/>
          <circle cx="137" cy="85" r="2.5"/><circle cx="137" cy="105" r="2.5"/><circle cx="137" cy="125" r="2.5"/><circle cx="137" cy="140" r="2.5"/>
          <circle cx="162" cy="82" r="2.5"/><circle cx="162" cy="100" r="2.5"/><circle cx="162" cy="120" r="2.5"/><circle cx="162" cy="138" r="2.5"/>
          <circle cx="187" cy="85" r="2.5"/><circle cx="187" cy="105" r="2.5"/><circle cx="187" cy="125" r="2.5"/><circle cx="187" cy="140" r="2.5"/>
          <circle cx="212" cy="82" r="2.5"/><circle cx="212" cy="100" r="2.5"/><circle cx="212" cy="120" r="2.5"/><circle cx="212" cy="138" r="2.5"/>
          <circle cx="237" cy="85" r="2.5"/><circle cx="237" cy="105" r="2.5"/><circle cx="237" cy="125" r="2.5"/><circle cx="237" cy="140" r="2.5"/>
          <circle cx="262" cy="82" r="2.5"/><circle cx="262" cy="100" r="2.5"/><circle cx="262" cy="120" r="2.5"/><circle cx="262" cy="138" r="2.5"/>
          <circle cx="287" cy="85" r="2.5"/><circle cx="287" cy="105" r="2.5"/><circle cx="287" cy="125" r="2.5"/><circle cx="287" cy="140" r="2.5"/>
          <circle cx="312" cy="82" r="2.5"/><circle cx="312" cy="100" r="2.5"/><circle cx="312" cy="120" r="2.5"/><circle cx="312" cy="138" r="2.5"/>
          <circle cx="337" cy="85" r="2.5"/><circle cx="337" cy="105" r="2.5"/><circle cx="337" cy="125" r="2.5"/><circle cx="337" cy="140" r="2.5"/>
          <circle cx="362" cy="82" r="2.5"/><circle cx="362" cy="100" r="2.5"/><circle cx="362" cy="120" r="2.5"/><circle cx="362" cy="138" r="2.5"/>
          <circle cx="385" cy="85" r="2.5"/><circle cx="385" cy="105" r="2.5"/><circle cx="385" cy="125" r="2.5"/>
        </g>
        <text x="402" y="105" class="label">Palisade Layer</text>
        <text x="402" y="116" class="sublabel">Chloroplasts (Photosynthesis)</text>
      </g>

      
      <g id="spongy-group" class="layer-group">
        
        <g fill="#dcfce7" stroke="#22c55e" stroke-width="1.2">
          <ellipse cx="45" cy="175" rx="16" ry="14"/>
          <ellipse cx="85" cy="168" rx="17" ry="12"/>
          <ellipse cx="130" cy="176" rx="16" ry="15"/>
          <ellipse cx="40" cy="215" rx="15" ry="13"/>
          <ellipse cx="78" cy="225" rx="17" ry="14"/>
          <ellipse cx="120" cy="220" rx="15" ry="13"/>
          <ellipse cx="160" cy="190" rx="14" ry="15"/>
          
          <ellipse cx="48" cy="260" rx="16" ry="14"/>
          <ellipse cx="90" cy="268" rx="15" ry="12"/>
          <ellipse cx="140" cy="262" rx="18" ry="13"/>

          
          <ellipse cx="365" cy="172" rx="16" ry="13"/>
          <ellipse cx="370" cy="215" rx="15" ry="14"/>
          <ellipse cx="360" cy="260" rx="16" ry="13"/>
        </g>
        
        <g fill="#16a34a">
          <circle cx="45" cy="175" r="2"/><circle cx="85" cy="168" r="2"/><circle cx="130" cy="176" r="2"/>
          <circle cx="40" cy="215" r="2"/><circle cx="78" cy="225" r="2"/><circle cx="120" cy="220" r="2"/>
          <circle cx="48" cy="260" r="2"/><circle cx="90" cy="268" r="2"/><circle cx="140" cy="262" r="2"/>
          <circle cx="365" cy="172" r="2"/><circle cx="370" cy="215" r="2"/><circle cx="360" cy="260" r="2"/>
        </g>
        <text x="402" y="195" class="label">Spongy Layer</text>
        <text x="402" y="206" class="sublabel">Air spaces for gas flow</text>
      </g>

      
      <g id="vein-group" class="layer-group">
        
        <ellipse cx="260" cy="205" rx="55" ry="46" fill="#fef9c3" stroke="#eab308" stroke-width="1.5"/>
        
        
        <g>
          <circle cx="245" cy="188" r="11" fill="url(#xylemGrad)" stroke="#1d4ed8" stroke-width="1.2"/>
          <circle cx="268" cy="186" r="10" fill="url(#xylemGrad)" stroke="#1d4ed8" stroke-width="1.2"/>
          <circle cx="256" cy="173" r="8" fill="url(#xylemGrad)" stroke="#1d4ed8" stroke-width="1.2"/>
          <circle cx="282" cy="192" r="7" fill="url(#xylemGrad)" stroke="#1d4ed8" stroke-width="1.2"/>
          <circle cx="232" cy="193" r="7" fill="url(#xylemGrad)" stroke="#1d4ed8" stroke-width="1.2"/>
        </g>

        
        <g>
          <circle cx="246" cy="222" r="8" fill="url(#phloemGrad)" stroke="#c2410c" stroke-width="1.2"/>
          <circle cx="265" cy="220" r="9" fill="url(#phloemGrad)" stroke="#c2410c" stroke-width="1.2"/>
          <circle cx="254" cy="235" r="7" fill="url(#phloemGrad)" stroke="#c2410c" stroke-width="1.2"/>
          <circle cx="278" cy="216" r="6" fill="url(#phloemGrad)" stroke="#c2410c" stroke-width="1.2"/>
          <circle cx="233" cy="218" r="6" fill="url(#phloemGrad)" stroke="#c2410c" stroke-width="1.2"/>
        </g>
        <text x="402" y="240" class="label">Vein Bundle</text>
        <text x="402" y="250" class="sublabel" fill="#1d4ed8">💧 Xylem (Water)</text>
        <text x="402" y="260" class="sublabel" fill="#ea580c">🍯 Phloem (Sugar)</text>
      </g>

      
      <g id="epidermis-bottom" class="layer-group">
        
        <g fill="#ecfdf5" stroke="#10b981" stroke-width="1.2">
          <rect x="25" y="285" width="40" height="24" rx="4"/>
          <rect x="68" y="285" width="40" height="24" rx="4"/>
          <rect x="111" y="285" width="40" height="24" rx="4"/>
        </g>
        
        
        <path d="M 166,285 C 154,288 150,305 166,309 C 172,305 172,288 166,285 Z" fill="#86efac" stroke="#15803d" stroke-width="1.5"/>
        <circle cx="160" cy="297" r="2" fill="#15803d"/>
        
        
        <path d="M 184,285 C 196,288 200,305 184,309 C 178,305 178,288 184,285 Z" fill="#86efac" stroke="#15803d" stroke-width="1.5"/>
        <circle cx="190" cy="297" r="2" fill="#15803d"/>

        
        <g fill="#ecfdf5" stroke="#10b981" stroke-width="1.2">
          <rect x="202" y="285" width="37" height="24" rx="4"/>
          <rect x="242" y="285" width="37" height="24" rx="4"/>
          <rect x="282" y="285" width="37" height="24" rx="4"/>
          <rect x="322" y="285" width="37" height="24" rx="4"/>
          <rect x="362" y="285" width="33" height="24" rx="4"/>
        </g>

        
        <rect x="25" y="311" width="128" height="5" rx="2.5" fill="#fef08a" opacity="0.85" stroke="#eab308" stroke-width="1"/>
        <rect x="198" y="311" width="197" height="5" rx="2.5" fill="#fef08a" opacity="0.85" stroke="#eab308" stroke-width="1"/>

        <text x="402" y="295" class="label">Lower Epidermis</text>
        <text x="402" y="306" class="label" fill="#15803d">Guard Cells & Stoma</text>
      </g>

      
      <g id="gas-flow-group" class="layer-group">
        
        <path d="M 175,360 L 175,250 L 125,230" fill="none" stroke="#0284c7" stroke-width="2.5" marker-end="url(#arrow-co2)" class="gas-flow"/>
        <text x="125" y="356" fill="#0284c7" font-size="11" font-weight="800">CO₂ (In)</text>

        
        <path d="M 205,245 L 180,265 L 180,360" fill="none" stroke="#16a34a" stroke-width="2.5" marker-end="url(#arrow-o2)" class="gas-flow-out"/>
        <text x="192" y="356" fill="#16a34a" font-size="11" font-weight="800">O₂ & H₂O (Out)</text>
      </g>
    </svg>
  </div>

  <script>
    function setMode(mode, btn) {
      document.querySelectorAll('.btn').forEach(b => b.classList.remove('active'));
      btn.classList.add('active');

      const allGroups = [
        'sun-layer', 'cuticle-top', 'epidermis-top', 
        'palisade-group', 'spongy-group', 'vein-group', 
        'epidermis-bottom', 'gas-flow-group'
      ];

      allGroups.forEach(id => {
        const el = document.getElementById(id);
        if (!el) return;
        el.classList.remove('dimmed');
      });

      if (mode === 'sun') {
        ['spongy-group', 'vein-group', 'epidermis-bottom', 'gas-flow-group'].forEach(id => {
          document.getElementById(id)?.classList.add('dimmed');
        });
      } else if (mode === 'gas') {
        ['sun-layer', 'cuticle-top', 'epidermis-top', 'vein-group'].forEach(id => {
          document.getElementById(id)?.classList.add('dimmed');
        });
      } else if (mode === 'vein') {
        ['sun-layer', 'cuticle-top', 'epidermis-top', 'palisade-group', 'gas-flow-group'].forEach(id => {
          document.getElementById(id)?.classList.add('dimmed');
        });
      }
    }
  </script>
</body>
</html>

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

    /* Top Selector Tabs */
    .controls {
      display: flex;
      gap: 6px;
      width: 100%;
      max-width: 340px;
      justify-content: center;
      margin-bottom: 4px;
      z-index: 10;
    }
    .tab-btn {
      flex: 1;
      padding: 6px 4px;
      font-size: 13px;
      font-weight: 600;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      background: #f8fafc;
      color: #64748b;
      cursor: pointer;
      text-align: center;
      transition: all 0.25s ease;
    }
    .tab-btn.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
      box-shadow: 0 2px 6px rgba(30, 41, 69, 0.2);
    }

    /* Diagram Canvas */
    .diagram-wrap {
      position: relative;
      width: 100%;
      max-width: 340px;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    svg {
      width: 100%;
      height: 100%;
      max-height: 330px;
      overflow: visible;
    }

    /* Organ groups */
    .organ-group {
      cursor: pointer;
      transition: opacity 0.3s ease, filter 0.3s ease;
    }
    .organ-group:hover {
      filter: drop-shadow(0 0 4px rgba(46, 204, 113, 0.4));
    }
    .organ-group.dimmed {
      opacity: 0.22;
      filter: grayscale(0.6);
    }
    .organ-group.active-focus {
      opacity: 1;
      filter: drop-shadow(0 0 6px rgba(46, 204, 113, 0.6));
    }

    /* Flow Animations */
    .flow-water {
      stroke: #3498db;
      stroke-width: 3;
      stroke-linecap: round;
      stroke-dasharray: 6 8;
      animation: waterFlow 1.2s linear infinite;
      filter: drop-shadow(0 0 2px #3498db);
    }
    .flow-sugar {
      stroke: #f39c12;
      stroke-width: 3;
      stroke-linecap: round;
      stroke-dasharray: 6 8;
      animation: sugarFlow 1.6s linear infinite;
      filter: drop-shadow(0 0 2px #f39c12);
    }

    @keyframes waterFlow {
      from { stroke-dashoffset: 28; }
      to { stroke-dashoffset: 0; }
    }
    @keyframes sugarFlow {
      from { stroke-dashoffset: 0; }
      to { stroke-dashoffset: 28; }
    }

    /* Callout Badges */
    .label-badge {
      font-size: 11px;
      font-weight: 700;
      fill: #1e2945;
    }
    .label-sub {
      font-size: 9.5px;
      font-weight: 500;
      fill: #64748b;
    }
    .badge-bg {
      fill: #ffffff;
      stroke: #e2e8f0;
      stroke-width: 1.5;
      rx: 6;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.06));
      transition: stroke 0.2s ease, fill 0.2s ease;
    }
    .organ-group.active-focus .badge-bg {
      stroke: #2ecc71;
      fill: #f0fdf4;
    }

    /* Legend Bar */
    .legend {
      display: flex;
      justify-content: center;
      gap: 16px;
      width: 100%;
      max-width: 340px;
      font-size: 11.5px;
      font-weight: 600;
      padding-top: 4px;
    }
    .legend-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .legend-line {
      width: 18px;
      height: 3px;
      border-radius: 2px;
    }
    .legend-water {
      background: #3498db;
    }
    .legend-sugar {
      background: #f39c12;
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <button class="tab-btn active" id="btn-all" onclick="setOrgan('all')">All</button>
    <button class="tab-btn" id="btn-leaves" onclick="setOrgan('leaves')">Leaves</button>
    <button class="tab-btn" id="btn-stem" onclick="setOrgan('stem')">Stem</button>
    <button class="tab-btn" id="btn-roots" onclick="setOrgan('roots')">Roots</button>
  </div>

  
  <div class="diagram-wrap">
    <svg viewBox="0 0 340 320" xmlns="http://www.w3.org/2000/svg">
      <defs>
        
        <linearGradient id="soilGrad" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stop-color="#8d6e63" stop-opacity="0.2"/>
          <stop offset="100%" stop-color="#8d6e63" stop-opacity="0.45"/>
        </linearGradient>
        <linearGradient id="leafGrad" x1="0" y1="0" x2="1" y2="1">
          <stop offset="0%" stop-color="#2ecc71"/>
          <stop offset="100%" stop-color="#27ae60"/>
        </linearGradient>
      </defs>

      
      <rect x="0" y="215" width="340" height="105" fill="url(#soilGrad)"/>
      <line x1="0" y1="215" x2="340" y2="215" stroke="#8d6e63" stroke-width="3" stroke-dasharray="340" stroke-linecap="round"/>
      <text x="10" y="230" fill="#8d6e63" font-size="9" font-weight="700" letter-spacing="0.5">SOIL LINE</text>

      
      <circle cx="310" cy="25" r="14" fill="#f1c40f" opacity="0.9"/>
      <circle cx="310" cy="25" r="20" fill="#f1c40f" opacity="0.2"/>

      
      <g id="roots-group" class="organ-group" onclick="setOrgan('roots')">
        
        <path d="M 170 215 Q 170 250 170 295" stroke="#8d6e63" stroke-width="6" fill="none" stroke-linecap="round"/>
        
        <path d="M 170 230 Q 140 250 115 275" stroke="#8d6e63" stroke-width="4.5" fill="none" stroke-linecap="round"/>
        <path d="M 140 250 Q 120 270 95 285" stroke="#8d6e63" stroke-width="3" fill="none" stroke-linecap="round"/>
        <path d="M 160 260 Q 145 285 130 305" stroke="#8d6e63" stroke-width="2.5" fill="none" stroke-linecap="round"/>
        
        <path d="M 170 235 Q 200 255 225 280" stroke="#8d6e63" stroke-width="4.5" fill="none" stroke-linecap="round"/>
        <path d="M 200 255 Q 220 275 240 295" stroke="#8d6e63" stroke-width="3" fill="none" stroke-linecap="round"/>
        <path d="M 175 265 Q 195 290 205 310" stroke="#8d6e63" stroke-width="2.5" fill="none" stroke-linecap="round"/>

        
        <path d="M 100 280 Q 135 250 166 220" class="flow-water" fill="none"/>
        <path d="M 235 290 Q 195 255 166 220" class="flow-water" fill="none"/>
        <path d="M 166 300 L 166 215" class="flow-water" fill="none"/>

        
        <path d="M 174 215 L 174 275" class="flow-sugar" fill="none"/>

        
        <g transform="translate(195, 235)">
          <rect class="badge-bg" x="0" y="0" width="138" height="34"/>
          <text class="label-badge" x="8" y="15">Roots</text>
          <text class="label-sub" x="8" y="27">Absorb &amp; Anchor</text>
        </g>
      </g>

      
      <g id="stem-group" class="organ-group" onclick="setOrgan('stem')">
        
        <path d="M 170 215 L 170 65" stroke="#2ecc71" stroke-width="12" stroke-linecap="round"/>
        <path d="M 170 215 L 170 65" stroke="#27ae60" stroke-width="2" stroke-linecap="round" opacity="0.3"/>

        
        <path d="M 166 215 L 166 65" class="flow-water" fill="none"/>
        <path d="M 174 65 L 174 215" class="flow-sugar" fill="none"/>

        
        <g transform="translate(8, 140)">
          <rect class="badge-bg" x="0" y="0" width="142" height="34"/>
          <text class="label-badge" x="8" y="15">Stem</text>
          <text class="label-sub" x="8" y="27">Support &amp; Transport</text>
        </g>
      </g>

      
      <g id="leaves-group" class="organ-group" onclick="setOrgan('leaves')">
        
        <path d="M 170 160 Q 130 155 105 130 Q 140 120 170 150" fill="url(#leafGrad)" stroke="#27ae60" stroke-width="1.5"/>
        
        <path d="M 170 135 Q 210 130 235 105 Q 200 95 170 125" fill="url(#leafGrad)" stroke="#27ae60" stroke-width="1.5"/>
        
        <path d="M 170 100 Q 120 95 90 65 Q 130 55 170 90" fill="url(#leafGrad)" stroke="#27ae60" stroke-width="1.5"/>
        
        <path d="M 170 85 Q 220 80 250 50 Q 210 40 170 75" fill="url(#leafGrad)" stroke="#27ae60" stroke-width="1.5"/>
        
        <ellipse cx="170" cy="55" rx="9" ry="14" fill="url(#leafGrad)" stroke="#27ae60" stroke-width="1.5"/>

        
        <path d="M 166 100 Q 135 95 105 75" class="flow-water" fill="none"/>
        
        <path d="M 235 60 Q 200 75 174 85" class="flow-sugar" fill="none"/>

        
        <g transform="translate(192, 10)">
          <rect class="badge-bg" x="0" y="0" width="142" height="34"/>
          <text class="label-badge" x="8" y="15">Leaves</text>
          <text class="label-sub" x="8" y="27">Sunlight &amp; Food</text>
        </g>
      </g>
    </svg>
  </div>

  
  <div class="legend">
    <div class="legend-item">
      <div class="legend-line legend-water"></div>
      <span>Water ↑ (Roots to Leaves)</span>
    </div>
    <div class="legend-item">
      <div class="legend-line legend-sugar"></div>
      <span>Sugar ↓ (Leaves to Plant)</span>
    </div>
  </div>

  <script>
    const groups = {
      leaves: document.getElementById('leaves-group'),
      stem: document.getElementById('stem-group'),
      roots: document.getElementById('roots-group')
    };

    const buttons = {
      all: document.getElementById('btn-all'),
      leaves: document.getElementById('btn-leaves'),
      stem: document.getElementById('btn-stem'),
      roots: document.getElementById('btn-roots')
    };

    function setOrgan(target) {
      // Update Button Styles
      Object.keys(buttons).forEach(key => {
        buttons[key].classList.toggle('active', key === target);
      });

      // Update Diagram Visual Focus
      Object.keys(groups).forEach(key => {
        const el = groups[key];
        el.classList.remove('active-focus', 'dimmed');
        if (target === 'all') {
          // Normal state for all
        } else if (key === target) {
          el.classList.add('active-focus');
        } else {
          el.classList.add('dimmed');
        }
      });
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 8px;
      user-select: none;
    }
    .diagram-svg {
      width: 100%;
      height: auto;
      max-height: 500px;
      display: block;
    }
    .label-title {
      font-size: 15px;
      font-weight: 700;
      fill: #1e2945;
      text-anchor: middle;
    }
    .label-sub {
      font-size: 12px;
      font-weight: 600;
      fill: #64748b;
      text-anchor: middle;
    }
    .water-drop {
      animation: absorb 3.5s ease-in-out infinite;
    }
    .drop-1 { animation-delay: 0.0s; }
    .drop-2 { animation-delay: 0.7s; }
    .drop-3 { animation-delay: 1.4s; }
    .drop-4 { animation-delay: 2.1s; }
    .drop-5 { animation-delay: 2.8s; }

    @keyframes absorb {
      0% {
        opacity: 0;
        transform: translate(0, 0) scale(0.6);
      }
      20% {
        opacity: 0.9;
        transform: translate(-6px, 2px) scale(1);
      }
      70% {
        opacity: 0.9;
        transform: translate(-24px, 6px) scale(0.9);
      }
      100% {
        opacity: 0;
        transform: translate(-38px, 10px) scale(0.3);
      }
    }
  </style>
</head>
<body>
  <svg class="diagram-svg" viewBox="0 0 680 440" xmlns="http://www.w3.org/2000/svg">
    <defs>
      
      <linearGradient id="soilGrad" x1="0" y1="0" x2="0" y2="1">
        <stop offset="0%" stop-color="#e8dfd5" />
        <stop offset="100%" stop-color="#d9cdbf" />
      </linearGradient>
      <linearGradient id="zoomBg" x1="0" y1="0" x2="1" y2="1">
        <stop offset="0%" stop-color="#fdfbf7" />
        <stop offset="100%" stop-color="#f5ede2" />
      </linearGradient>
      <linearGradient id="taprootGrad" x1="0" y1="0" x2="1" y2="0">
        <stop offset="0%" stop-color="#f97316" />
        <stop offset="100%" stop-color="#ea580c" />
      </linearGradient>
      <clipPath id="circleClip">
        <circle cx="505" cy="220" r="145" />
      </clipPath>
      <filter id="softGlow" x="-20%" y="-20%" width="140%" height="140%">
        <feGaussianBlur stdDeviation="3" result="blur" />
        <feComposite in="SourceGraphic" in2="blur" operator="over" />
      </filter>
    </defs>

    
    
    <rect x="20" y="100" width="145" height="290" rx="14" fill="url(#soilGrad)" opacity="0.6"/>
    <rect x="175" y="100" width="145" height="290" rx="14" fill="url(#soilGrad)" opacity="0.6"/>

    
    <line x1="20" y1="100" x2="165" y2="100" stroke="#a48c74" stroke-width="2.5" stroke-linecap="round"/>
    <line x1="175" y1="100" x2="320" y2="100" stroke="#a48c74" stroke-width="2.5" stroke-linecap="round"/>

    
    
    <path d="M92 100 Q80 70 65 65 Q85 62 92 95" fill="#22c55e"/>
    <path d="M92 100 Q92 50 102 45 Q102 65 93 95" fill="#16a34a"/>
    <path d="M93 100 Q110 70 125 65 Q105 62 93 95" fill="#22c55e"/>

    
    <path d="M85 100 Q88 230 92 345 Q96 230 100 100 Z" fill="url(#taprootGrad)"/>
    
    <path d="M88 135 Q65 145 50 160" stroke="#ea580c" stroke-width="3" stroke-linecap="round" fill="none"/>
    <path d="M97 150 Q118 165 135 180" stroke="#ea580c" stroke-width="3" stroke-linecap="round" fill="none"/>
    <path d="M89 190 Q68 205 55 225" stroke="#ea580c" stroke-width="2.5" stroke-linecap="round" fill="none"/>
    <path d="M96 210 Q115 225 130 245" stroke="#ea580c" stroke-width="2.5" stroke-linecap="round" fill="none"/>
    <path d="M90 260 Q75 275 65 295" stroke="#ea580c" stroke-width="2" stroke-linecap="round" fill="none"/>
    <path d="M95 275 Q110 290 120 310" stroke="#ea580c" stroke-width="2" stroke-linecap="round" fill="none"/>

    
    
    <path d="M248 100 Q230 65 210 50 Q235 60 246 95" fill="#22c55e"/>
    <path d="M248 100 Q248 45 242 35 Q252 55 248 95" fill="#16a34a"/>
    <path d="M248 100 Q265 65 285 50 Q260 60 250 95" fill="#22c55e"/>

    
    <g stroke="#c27803" fill="none" stroke-linecap="round">
      <path d="M248 100 Q235 150 200 190 Q185 220 182 260" stroke-width="2.5"/>
      <path d="M248 100 Q225 170 215 240 Q210 280 205 315" stroke-width="2.5"/>
      <path d="M248 100 Q240 180 235 250 Q232 300 230 340" stroke-width="2.5"/>
      <path d="M248 100 Q255 180 260 250 Q265 300 268 340" stroke-width="2.5"/>
      <path d="M248 100 Q270 170 280 240 Q285 280 290 315" stroke-width="2.5"/>
      <path d="M248 100 Q260 150 295 190 Q310 220 312 260" stroke-width="2.5"/>
      
      <path d="M210 175 Q195 200 190 225" stroke-width="1.8"/>
      <path d="M225 210 Q240 235 245 270" stroke-width="1.8"/>
      <path d="M270 210 Q255 235 250 270" stroke-width="1.8"/>
      <path d="M285 175 Q300 200 305 225" stroke-width="1.8"/>
    </g>

    
    <text x="92.5" y="415" class="label-title">Taproot</text>
    <text x="247.5" y="415" class="label-title">Fibrous Root</text>

    
    <circle cx="92" cy="345" r="9" fill="none" stroke="#22b7ff" stroke-width="2" stroke-dasharray="3,3"/>
    <path d="M99 340 L 368 140" stroke="#22b7ff" stroke-width="1.5" stroke-dasharray="4,4" opacity="0.6"/>
    <path d="M99 350 L 368 300" stroke="#22b7ff" stroke-width="1.5" stroke-dasharray="4,4" opacity="0.6"/>

    
    <g>
      
      <circle cx="505" cy="220" r="145" fill="url(#zoomBg)" stroke="#1e2945" stroke-width="3"/>
      
      <g clip-path="url(#circleClip)">
        
        <g fill="#9c7857" opacity="0.85">
          <circle cx="540" cy="115" r="16"/>
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OGS.7.LS.4

Aligned learning resources

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