<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #f8f9fa;
      color: #1e2945;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .nav-bar {
      display: flex;
      gap: 6px;
      margin-bottom: 8px;
      background: #e2e8f0;
      padding: 3px;
      border-radius: 8px;
    }

    .nav-btn {
      background: transparent;
      border: none;
      padding: 5px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      border-radius: 6px;
      cursor: pointer;
      box-shadow: none;
      transition: background 0.15s, color 0.15s;
    }

    .nav-btn.active {
      background: #ffffff;
      color: #0284c7;
      box-shadow: 0 1px 2px rgba(0,0,0,0.08);
    }

    .chart-wrapper {
      width: 100%;
      max-width: 560px;
    }

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

    .gen-row {
      transition: opacity 0.3s ease;
    }

    .gen-row.dimmed {
      opacity: 0.22;
    }

    .mean-line {
      stroke-dasharray: 4 3;
      stroke-width: 1.5;
    }

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

    .mean-val {
      font-size: 12px;
      font-weight: 700;
      fill: #0284c7;
    }

    .selected-tag {
      font-size: 11px;
      font-weight: 700;
      fill: #16a34a;
    }

    .axis-text {
      font-size: 11px;
      fill: #64748b;
      font-weight: 600;
    }
  </style>
</head>
<body>

  <div class="nav-bar">
    <button class="nav-btn active" onclick="showGen('all')">All Generations</button>
    <button class="nav-btn" onclick="showGen(1)">Gen 1</button>
    <button class="nav-btn" onclick="showGen(2)">Gen 2</button>
    <button class="nav-btn" onclick="showGen(10)">Gen 10</button>
  </div>

  <div class="chart-wrapper">
    <svg viewBox="0 0 500 272" id="plotSvg">
      
      <line x1="60" y1="230" x2="480" y2="230" stroke="#cbd5e1" stroke-width="1.5" />
      
      
      
      <line x1="60" y1="230" x2="60" y2="236" stroke="#94a3b8" stroke-width="1" />
      <text x="60" y="248" text-anchor="middle" class="axis-text">0</text>

      
      <line x1="144" y1="230" x2="144" y2="236" stroke="#94a3b8" stroke-width="1" />
      <text x="144" y="248" text-anchor="middle" class="axis-text">10</text>

      
      <line x1="228" y1="230" x2="228" y2="236" stroke="#94a3b8" stroke-width="1" />
      <text x="228" y="248" text-anchor="middle" class="axis-text">20</text>

      
      <line x1="312" y1="230" x2="312" y2="236" stroke="#94a3b8" stroke-width="1" />
      <text x="312" y="248" text-anchor="middle" class="axis-text">30</text>

      
      <line x1="396" y1="230" x2="396" y2="236" stroke="#94a3b8" stroke-width="1" />
      <text x="396" y="248" text-anchor="middle" class="axis-text">40</text>

      
      <line x1="480" y1="230" x2="480" y2="236" stroke="#94a3b8" stroke-width="1" />
      <text x="480" y="248" text-anchor="middle" class="axis-text">50</text>

      <text x="270" y="266" text-anchor="middle" class="axis-text" style="font-weight:700; fill:#1e2945;">Milk Yield (L/day)</text>

      
      <g id="row-1" class="gen-row">
        <text x="10" y="60" class="label-badge">Gen 1</text>
        <path id="curve1-base" fill="#e0f2fe" stroke="#38bdf8" stroke-width="2" />
        <path id="curve1-sel" fill="#86efac" stroke="#22c55e" stroke-width="2" />
        <line x1="186" y1="20" x2="186" y2="70" stroke="#0284c7" class="mean-line" />
        <text x="186" y="16" text-anchor="middle" class="mean-val">15 L</text>
        <text x="238" y="42" class="selected-tag">Top 20% ✦</text>
      </g>

      
      <g id="row-2" class="gen-row">
        <text x="10" y="135" class="label-badge">Gen 2</text>
        <path id="curve2-base" fill="#e0f2fe" stroke="#38bdf8" stroke-width="2" />
        <path id="curve2-sel" fill="#86efac" stroke="#22c55e" stroke-width="2" />
        <line x1="245" y1="95" x2="245" y2="145" stroke="#0284c7" class="mean-line" />
        <text x="245" y="91" text-anchor="middle" class="mean-val">22 L</text>
        <text x="295" y="117" class="selected-tag">Top 20% ✦</text>
      </g>

      
      <g id="row-10" class="gen-row">
        <text x="10" y="210" class="label-badge">Gen 10</text>
        <path id="curve10-base" fill="#bae6fd" stroke="#0284c7" stroke-width="2" />
        <line x1="396" y1="170" x2="396" y2="220" stroke="#0284c7" class="mean-line" />
        <text x="396" y="166" text-anchor="middle" class="mean-val">40 L</text>
      </g>
    </svg>
  </div>

  <script>
    function xToPx(liters) {
      return 60 + liters * 8.4;
    }

    function normalPdf(x, mean, sigma) {
      return Math.exp(-0.5 * Math.pow((x - mean) / sigma, 2));
    }

    function generatePath(mean, sigma, baseY, height, xMin, xMax) {
      const step = 0.5;
      let d = `M ${xToPx(xMin)} ${baseY}`;
      for (let x = xMin; x <= xMax; x += step) {
        const px = xToPx(x);
        const py = baseY - normalPdf(x, mean, sigma) * height;
        d += ` L ${px.toFixed(1)} ${py.toFixed(1)}`;
      }
      d += ` L ${xToPx(xMax)} ${baseY} Z`;
      return d;
    }

    // Gen 1: mean 15, sigma 4.2 -> top 20% is x >= 18.5
    document.getElementById('curve1-base').setAttribute('d', generatePath(15, 4.2, 70, 48, 2, 18.5));
    document.getElementById('curve1-sel').setAttribute('d', generatePath(15, 4.2, 70, 48, 18.5, 28));

    // Gen 2: mean 22, sigma 4.2 -> top 20% is x >= 25.5
    document.getElementById('curve2-base').setAttribute('d', generatePath(22, 4.2, 145, 48, 9, 25.5));
    document.getElementById('curve2-sel').setAttribute('d', generatePath(22, 4.2, 145, 48, 25.5, 35));

    // Gen 10: mean 40, sigma 3.8
    document.getElementById('curve10-base').setAttribute('d', generatePath(40, 3.8, 220, 48, 26, 50));

    function showGen(gen) {
      const buttons = document.querySelectorAll('.nav-btn');
      buttons.forEach(btn => btn.classList.remove('active'));

      const rows = [
        { id: 'row-1', key: 1 },
        { id: 'row-2', key: 2 },
        { id: 'row-10', key: 10 }
      ];

      if (gen === 'all') {
        buttons[0].classList.add('active');
        rows.forEach(r => document.getElementById(r.id).classList.remove('dimmed'));
      } else {
        const idx = gen === 1 ? 1 : gen === 2 ? 2 : 3;
        buttons[idx].classList.add('active');
        rows.forEach(r => {
          const el = document.getElementById(r.id);
          if (r.key === gen) {
            el.classList.remove('dimmed');
          } else {
            el.classList.add('dimmed');
          }
        });
      }
    }
  </script>
</body>
</html>

Selective Breeding in Plants and 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, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
    }

    .header-bar {
      display: flex;
      justify-content: center;
      margin-bottom: 10px;
      width: 100%;
    }

    .btn-action {
      background: #2563eb;
      color: #ffffff;
      border: none;
      border-radius: 20px;
      padding: 8px 18px;
      font-size: 14px;
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
      transition: background 0.2s, transform 0.1s;
    }
    .btn-action:active {
      transform: scale(0.97);
    }
    .btn-action.active {
      background: #dc2626;
      box-shadow: 0 2px 6px rgba(220, 38, 38, 0.25);
    }

    .grid-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
      max-width: 620px;
    }

    @media (max-width: 480px) {
      .grid-container {
        grid-template-columns: 1fr;
      }
    }

    .pop-card {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 14px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
      overflow: hidden;
    }

    .pop-title {
      font-size: 14px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 12px;
      text-align: center;
    }

    .plants-row {
      display: flex;
      justify-content: center;
      align-items: flex-end;
      gap: 8px;
      margin-bottom: 14px;
      width: 100%;
      height: 90px;
    }

    .plant-col {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }

    .plant-icon {
      font-size: 26px;
      line-height: 1;
      transition: transform 0.4s ease, filter 0.4s ease, opacity 0.4s ease;
    }

    .dna-pill {
      display: flex;
      flex-direction: column;
      gap: 2px;
      padding: 2px;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 4px;
      width: 14px;
      height: 38px;
      justify-content: space-around;
      align-items: center;
    }

    .allele {
      width: 8px;
      height: 5px;
      border-radius: 1px;
    }

    /* Allele colors */
    .al-blue   { background: #3b82f6; }
    .al-purple { background: #8b5cf6; }
    .al-amber  { background: #f59e0b; }
    .al-green  { background: #10b981; }
    .al-rose   { background: #f43f5e; }
    .al-yellow { background: #eab308; }

    /* Outbreak state styling */
    .outbreak .wilted .plant-icon {
      transform: rotate(65deg) translateY(4px);
      filter: grayscale(0.9) brightness(0.6) sepia(0.6) hue-rotate(-30deg);
      opacity: 0.6;
    }

    .outbreak .resistant .plant-icon {
      transform: scale(1.08);
      filter: drop-shadow(0 0 4px rgba(34, 197, 94, 0.5));
    }

    .pill-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 700;
      padding: 6px 14px;
      border-radius: 20px;
      transition: all 0.3s ease;
      width: 100%;
      max-width: 170px;
      text-align: center;
    }

    .pill-neutral {
      background: #e2e8f0;
      color: #475569;
    }

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

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

    .pathogen-particles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      opacity: 0;
      transition: opacity 0.4s ease;
      background: radial-gradient(circle at 50% 30%, rgba(239, 68, 68, 0.12) 0%, transparent 70%);
    }

    .outbreak .pathogen-particles {
      opacity: 1;
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <button id="outbreakBtn" class="btn-action" onclick="toggleOutbreak()">
      <span id="btnIcon">🦠</span>
      <span id="btnText">Release Pathogen</span>
    </button>
  </div>

  <div class="grid-container" id="grid">
    
    <div class="pop-card">
      <div class="pathogen-particles"></div>
      <div class="pop-title">Wild Population</div>
      
      <div class="plants-row">
        
        <div class="plant-col resistant">
          <div class="plant-icon">🌿</div>
          <div class="dna-pill">
            <div class="allele al-blue"></div>
            <div class="allele al-green"></div>
            <div class="allele al-purple"></div>
          </div>
        </div>
        
        <div class="plant-col resistant">
          <div class="plant-icon">🌿</div>
          <div class="dna-pill">
            <div class="allele al-purple"></div>
            <div class="allele al-rose"></div>
            <div class="allele al-blue"></div>
          </div>
        </div>
        
        <div class="plant-col wilted">
          <div class="plant-icon">🌿</div>
          <div class="dna-pill">
            <div class="allele al-yellow"></div>
            <div class="allele al-amber"></div>
            <div class="allele al-yellow"></div>
          </div>
        </div>
        
        <div class="plant-col resistant">
          <div class="plant-icon">🌿</div>
          <div class="dna-pill">
            <div class="allele al-green"></div>
            <div class="allele al-blue"></div>
            <div class="allele al-rose"></div>
          </div>
        </div>
        
        <div class="plant-col resistant">
          <div class="plant-icon">🌿</div>
          <div class="dna-pill">
            <div class="allele al-rose"></div>
            <div class="allele al-purple"></div>
            <div class="allele al-green"></div>
          </div>
        </div>
      </div>

      <div id="wildBadge" class="pill-badge pill-neutral">Diverse Alleles</div>
    </div>

    
    <div class="pop-card">
      <div class="pathogen-particles"></div>
      <div class="pop-title">Monoculture Crop</div>
      
      <div class="plants-row">
        
        <div class="plant-col wilted">
          <div class="plant-icon">🌱</div>
          <div class="dna-pill">
            <div class="allele al-yellow"></div>
            <div class="allele al-amber"></div>
            <div class="allele al-yellow"></div>
          </div>
        </div>
        
        <div class="plant-col wilted">
          <div class="plant-icon">🌱</div>
          <div class="dna-pill">
            <div class="allele al-yellow"></div>
            <div class="allele al-amber"></div>
            <div class="allele al-yellow"></div>
          </div>
        </div>
        
        <div class="plant-col wilted">
          <div class="plant-icon">🌱</div>
          <div class="dna-pill">
            <div class="allele al-yellow"></div>
            <div class="allele al-amber"></div>
            <div class="allele al-yellow"></div>
          </div>
        </div>
        
        <div class="plant-col wilted">
          <div class="plant-icon">🌱</div>
          <div class="dna-pill">
            <div class="allele al-yellow"></div>
            <div class="allele al-amber"></div>
            <div class="allele al-yellow"></div>
          </div>
        </div>
        
        <div class="plant-col wilted">
          <div class="plant-icon">🌱</div>
          <div class="dna-pill">
            <div class="allele al-yellow"></div>
            <div class="allele al-amber"></div>
            <div class="allele al-yellow"></div>
          </div>
        </div>
      </div>

      <div id="monoBadge" class="pill-badge pill-neutral">Identical Alleles</div>
    </div>
  </div>

  <script>
    let isOutbreak = false;

    function toggleOutbreak() {
      isOutbreak = !isOutbreak;
      const grid = document.getElementById('grid');
      const btn = document.getElementById('outbreakBtn');
      const btnIcon = document.getElementById('btnIcon');
      const btnText = document.getElementById('btnText');
      const wildBadge = document.getElementById('wildBadge');
      const monoBadge = document.getElementById('monoBadge');

      if (isOutbreak) {
        grid.classList.add('outbreak');
        btn.classList.add('active');
        btnIcon.textContent = '↺';
        btnText.textContent = 'Reset Simulation';
        
        wildBadge.className = 'pill-badge pill-success';
        wildBadge.textContent = '✓ 80% Survival';

        monoBadge.className = 'pill-badge pill-danger';
        monoBadge.textContent = '✗ 0% Survival';
      } else {
        grid.classList.remove('outbreak');
        btn.classList.remove('active');
        btnIcon.textContent = '🦠';
        btnText.textContent = 'Release Pathogen';

        wildBadge.className = 'pill-badge pill-neutral';
        wildBadge.textContent = 'Diverse Alleles';

        monoBadge.className = 'pill-badge pill-neutral';
        monoBadge.textContent = 'Identical Alleles';
      }
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Artificial Selection in Brassica oleracea</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8f9fa;
      color: #1e2945;
      width: 100%;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 10px 14px;
      user-select: none;
    }

    .main-wrapper {
      width: 100%;
      max-width: 580px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .header-text {
      text-align: center;
      margin-bottom: 2px;
    }

    .header-title {
      font-size: 15px;
      font-weight: 700;
      color: #1e2945;
      line-height: 1.2;
    }

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

    .diagram-container {
      position: relative;
      width: 100%;
    }

    .connectors-svg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 1;
    }

    .conn-path {
      fill: none;
      stroke: #cbd5e1;
      stroke-width: 2;
      stroke-dasharray: 4 3;
      transition: stroke 0.3s ease, stroke-width 0.3s ease, opacity 0.3s ease;
    }

    .conn-path.active {
      stroke: #10b981;
      stroke-width: 2.5;
      stroke-dasharray: none;
      filter: drop-shadow(0 1px 3px rgba(16, 185, 129, 0.4));
    }

    .diagram-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      grid-template-rows: 1fr 1fr;
      gap: 12px 16px;
      width: 100%;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .center-card {
      grid-column: 2;
      grid-row: 1 / span 2;
      background: #ffffff;
      border: 2px solid #10b981;
      border-radius: 14px;
      padding: 12px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.14);
      width: 124px;
      z-index: 3;
    }

    .wild-icon {
      font-size: 30px;
      line-height: 1;
      margin-bottom: 4px;
    }

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

    .wild-sub {
      font-size: 10.5px;
      font-style: italic;
      color: #059669;
      font-weight: 600;
      margin-top: 2px;
    }

    .wild-tag {
      margin-top: 6px;
      background: #ecfdf5;
      color: #047857;
      font-size: 9px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 6px;
      text-transform: uppercase;
      letter-spacing: 0.4px;
    }

    .veg-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 8px 10px;
      display: flex;
      align-items: center;
      gap: 9px;
      cursor: pointer;
      transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
      position: relative;
      z-index: 3;
    }

    .veg-card:hover {
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
      border-color: #94a3b8;
    }

    .veg-card.active {
      border-color: #10b981;
      background: #ffffff;
      box-shadow: 0 0 0 1px #10b981, 0 4px 12px rgba(16, 185, 129, 0.15);
    }

    .veg-icon {
      font-size: 26px;
      line-height: 1;
      flex-shrink: 0;
    }

    .veg-info {
      display: flex;
      flex-direction: column;
      min-width: 0;
    }

    .veg-name {
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      line-height: 1.2;
    }

    .veg-card.active .veg-name {
      color: #047857;
    }

    .trait-badge {
      font-size: 10.5px;
      color: #64748b;
      font-weight: 500;
      margin-top: 2px;
      line-height: 1.2;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .veg-card.active .trait-badge {
      color: #059669;
      font-weight: 600;
    }

    /* Grid positions */
    .pos-tl { grid-column: 1; grid-row: 1; }
    .pos-bl { grid-column: 1; grid-row: 2; }
    .pos-tr { grid-column: 3; grid-row: 1; }
    .pos-br { grid-column: 3; grid-row: 2; }

    /* Details Panel */
    .details-box {
      background: #ffffff;
      border: 1.5px solid #d1fae5;
      border-radius: 12px;
      padding: 10px 14px;
      box-shadow: 0 2px 6px rgba(16, 185, 129, 0.08);
      position: relative;
    }

    .details-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 4px;
    }

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

    .details-icon {
      font-size: 16px;
    }

    .details-title {
      font-size: 13px;
      font-weight: 700;
      color: #065f46;
    }

    .details-badge {
      font-size: 10px;
      font-weight: 600;
      background: #ecfdf5;
      color: #047857;
      padding: 2px 7px;
      border-radius: 10px;
      border: 1px solid #a7f3d0;
    }

    .details-desc {
      font-size: 11.5px;
      line-height: 1.45;
      color: #334155;
    }

    .details-desc strong {
      color: #0f172a;
    }

    @media (max-width: 440px) {
      .diagram-grid {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto auto;
        gap: 8px;
      }
      .center-card {
        grid-column: 1 / span 2;
        grid-row: 1;
        width: 100%;
        flex-direction: row;
        gap: 10px;
        padding: 6px 12px;
      }
      .wild-icon { margin-bottom: 0; font-size: 24px; }
      .wild-tag { margin-top: 0; margin-left: 6px; display: inline-block; }
      .pos-tl { grid-column: 1; grid-row: 2; }
      .pos-tr { grid-column: 2; grid-row: 2; }
      .pos-bl { grid-column: 1; grid-row: 3; }
      .pos-br { grid-column: 2; grid-row: 3; }
      .veg-card { padding: 7px 8px; gap: 6px; }
      .veg-icon { font-size: 22px; }
      .veg-name { font-size: 12px; }
      .trait-badge { font-size: 9.5px; }
      .details-box { padding: 8px 10px; }
      .details-desc { font-size: 11px; }
    }
  </style>
</head>
<body>

  <div class="main-wrapper">
    <div class="header-text">
      <div class="header-title">Artificial Selection from Wild Mustard</div>
      <div class="header-sub">Click a vegetable to explore the trait farmers selectively bred</div>
    </div>

    <div class="diagram-container" id="diagramContainer">
      <svg class="connectors-svg" id="connectorsSvg">
        <path id="line-0" class="conn-path"></path>
        <path id="line-1" class="conn-path"></path>
        <path id="line-2" class="conn-path"></path>
        <path id="line-3" class="conn-path"></path>
      </svg>

      <div class="diagram-grid">
        
        <div class="center-card" id="centerCard">
          <div class="wild-icon">🌱</div>
          <div>
            <div class="wild-title">Wild Mustard</div>
            <div class="wild-sub">Brassica oleracea</div>
            <div class="wild-tag">Ancestor</div>
          </div>
        </div>

        
        <div class="veg-card pos-tl active" data-index="0">
          <div class="veg-icon">🥬</div>
          <div class="veg-info">
            <span class="veg-name">Kale</span>
            <span class="trait-badge">Enlarged leaves</span>
          </div>
        </div>

        
        <div class="veg-card pos-bl" data-index="1">
          <div class="veg-icon">🪴</div>
          <div class="veg-info">
            <span class="veg-name">Kohlrabi</span>
            <span class="trait-badge">Swollen stem</span>
          </div>
        </div>

        
        <div class="veg-card pos-tr" data-index="2">
          <div class="veg-icon">🥦</div>
          <div class="veg-info">
            <span class="veg-name">Broccoli</span>
            <span class="trait-badge">Flower buds & stems</span>
          </div>
        </div>

        
        <div class="veg-card pos-br" data-index="3">
          <div class="veg-icon">🥗</div>
          <div class="veg-info">
            <span class="veg-name">Cabbage</span>
            <span class="trait-badge">Terminal bud</span>
          </div>
        </div>
      </div>
    </div>

    
    <div class="details-box">
      <div class="details-header">
        <div class="details-title-group">
          <span class="details-icon" id="detailIcon">🥬</span>
          <span class="details-title" id="detailName">Kale</span>
        </div>
        <span class="details-badge" id="detailTrait">Target Trait: Enlarged Leaves</span>
      </div>
      <div class="details-desc" id="detailDesc">
        <strong>Selection Purpose:</strong> Farmers selected and propagated mustard plants with larger, broader, and more nutritious leaves over generations, resulting in hardy leafy green foliage.
      </div>
    </div>
  </div>

  <script>
    const vegData = [
      {
        name: "Kale",
        icon: "🥬",
        trait: "Target Trait: Enlarged Leaves",
        desc: "Farmers selected and propagated wild mustard plants with larger, broader, and more nutritious leaves over generations, resulting in hardy, nutrient-dense leafy greens."
      },
      {
        name: "Kohlrabi",
        icon: "🪴",
        trait: "Target Trait: Swollen Stem",
        desc: "Breeders selected plants that developed thick, bulbous stems above ground, creating a crisp, juicy turnip-like vegetable rich in vitamin C and dietary fiber."
      },
      {
        name: "Broccoli",
        icon: "🥦",
        trait: "Target Trait: Flower Buds & Stems",
        desc: "Selected by arresting floral development to create dense clusters of immature flower buds and tender, edible flower stalks before they bloom into yellow petals."
      },
      {
        name: "Cabbage",
        icon: "🥗",
        trait: "Target Trait: Enlarged Terminal Bud",
        desc: "Selected for extremely short internode spacing between leaves and an oversized terminal bud, forming tightly packed, compact heads ideal for long storage."
      }
    ];

    const cards = document.querySelectorAll('.veg-card');
    const centerCard = document.getElementById('centerCard');
    const container = document.getElementById('diagramContainer');
    const detailIcon = document.getElementById('detailIcon');
    const detailName = document.getElementById('detailName');
    const detailTrait = document.getElementById('detailTrait');
    const detailDesc = document.getElementById('detailDesc');

    let currentIndex = 0;
    let autoPlayTimer = null;

    function updateConnectors() {
      const containerRect = container.getBoundingClientRect();
      const centerRect = centerCard.getBoundingClientRect();
      const isStacked = window.innerWidth <= 440;

      const cMidX = (centerRect.left + centerRect.right) / 2 - containerRect.left;
      const cMidY = (centerRect.top + centerRect.bottom) / 2 - containerRect.top;

      cards.forEach((card, idx) => {
        const line = document.getElementById(`line-${idx}`);
        if (!line) return;

        const cardRect = card.getBoundingClientRect();
        const cardMidX = (cardRect.left + cardRect.right) / 2 - containerRect.left;
        const cardMidY = (cardRect.top + cardRect.bottom) / 2 - containerRect.top;

        let startX, startY, endX, endY;

        if (isStacked) {
          startX = cMidX;
          startY = centerRect.bottom - containerRect.top;
          endX = cardMidX;
          endY = cardRect.top - containerRect.top;
          line.setAttribute('d', `M ${startX} ${startY} Q ${startX} ${(startY + endY) / 2}, ${endX} ${endY}`);
        } else {
          if (cardMidX < cMidX) {
            startX = centerRect.left - containerRect.left;
            startY = cMidY;
            endX = cardRect.right - containerRect.left;
            endY = cardMidY;
          } else {
            startX = centerRect.right - containerRect.left;
            startY = cMidY;
            endX = cardRect.left - containerRect.left;
            endY = cardMidY;
          }
          const controlX = (startX + endX) / 2;
          line.setAttribute('d', `M ${startX} ${startY} C ${controlX} ${startY}, ${controlX} ${endY}, ${endX} ${endY}`);
        }

        line.classList.toggle('active', idx === currentIndex);
      });
    }

    function selectCard(index) {
      currentIndex = index;
      cards.forEach((c, i) => {
        c.classList.toggle('active', i === index);
      });

      const data = vegData[index];
      detailIcon.textContent = data.icon;
      detailName.textContent = data.name;
      detailTrait.textContent = data.trait;
      detailDesc.innerHTML = `<strong>Selection Purpose:</strong> ${data.desc}`;

      updateConnectors();
    }

    cards.forEach((card, idx) => {
      card.addEventListener('click', () => {
        clearInterval(autoPlayTimer);
        selectCard(idx);
      });
    });

    window.addEventListener('resize', updateConnectors);
    window.addEventListener('load', updateConnectors);

    // Initial connector setup
    requestAnimationFrame(updateConnectors);

    // Gentle auto-cycle every 4 seconds
    autoPlayTimer = setInterval(() => {
      currentIndex = (currentIndex + 1) % cards.length;
      selectCard(currentIndex);
    }, 4000);
  </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">
  <script src="{{VENDOR_CDN}}/classace-diagram.js"></script>
  <style>
    :root {
      --primary: #2563eb;
      --primary-light: #eff6ff;
      --primary-border: #93c5fd;
      --text: #1e2945;
      --muted: #64748b;
      --border: #e2e8f0;
      --bg-card: #ffffff;
      --active-glow: 0 0 0 3px rgba(37, 99, 235, 0.25), 0 4px 12px rgba(37, 99, 235, 0.15);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: var(--text);
      background: transparent;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }

    .diagram-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 8px;
      width: 100%;
      max-width: 680px;
      position: relative;
    }

    .step-card {
      background: var(--bg-card);
      border: 1.5px solid var(--border);
      border-radius: 12px;
      padding: 12px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      position: relative;
      cursor: pointer;
      transition: border-color 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
      min-height: 160px;
      justify-content: space-between;
    }

    .step-card.active {
      border-color: var(--primary);
      background-color: var(--primary-light);
      box-shadow: var(--active-glow);
    }

    .step-badge {
      width: 26px;
      height: 26px;
      border-radius: 50%;
      background: #e2e8f0;
      color: var(--muted);
      font-weight: 700;
      font-size: 13px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.25s ease, color 0.25s ease;
      flex-shrink: 0;
    }

    .step-card.active .step-badge {
      background: var(--primary);
      color: #ffffff;
    }

    .icon-box {
      font-size: 28px;
      line-height: 1;
      margin: 8px 0;
      height: 38px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .icon-sub {
      font-size: 14px;
      margin-left: 2px;
      opacity: 0.7;
    }

    .step-label {
      font-size: 13px;
      font-weight: 600;
      line-height: 1.25;
      color: var(--text);
      letter-spacing: -0.01em;
    }

    .connector-arrow {
      position: absolute;
      right: -10px;
      top: 50%;
      transform: translateY(-50%);
      font-size: 14px;
      color: var(--muted);
      z-index: 2;
      pointer-events: none;
      font-weight: bold;
    }

    /* Loopback arrow indicating continuous generations */
    .loop-banner {
      width: 100%;
      max-width: 680px;
      margin-top: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      background: var(--primary-light);
      border: 1px dashed var(--primary-border);
      border-radius: 8px;
      padding: 6px 12px;
    }

    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      margin-top: 12px;
    }

    .btn-ctrl {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 20px;
      padding: 5px 14px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text);
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: background-color 0.2s ease, border-color 0.2s ease;
    }

    .btn-ctrl:active {
      background: #f1f5f9;
    }

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

    .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      transition: background-color 0.25s ease, opacity 0.25s ease;
    }

    .dot.active {
      background: var(--primary);
      box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
    }

    /* Mobile Responsive Layout */
    @media (max-width: 480px) {
      .diagram-grid {
        grid-template-columns: 1fr;
        gap: 6px;
      }

      .step-card {
        flex-direction: row;
        min-height: auto;
        padding: 8px 12px;
        text-align: left;
        justify-content: flex-start;
        gap: 10px;
      }

      .icon-box {
        margin: 0;
        height: auto;
        font-size: 24px;
      }

      .step-label {
        flex: 1;
        font-size: 13px;
      }

      .connector-arrow {
        display: none;
      }
    }
  </style>
</head>
<body>

  <div class="diagram-grid">
    
    <div class="step-card step active" data-step="0">
      <div class="step-badge">1</div>
      <div class="icon-box">🎯🌾</div>
      <div class="step-label">Identify<br>Desired Trait</div>
      <span class="connector-arrow">→</span>
    </div>

    
    <div class="step-card step" data-step="1">
      <div class="step-badge">2</div>
      <div class="icon-box">🌾<span class="icon-sub">✨</span>🌾</div>
      <div class="step-label">Select<br>Parents</div>
      <span class="connector-arrow">→</span>
    </div>

    
    <div class="step-card step" data-step="2">
      <div class="step-badge">3</div>
      <div class="icon-box">🌾 ⨉ 🌾</div>
      <div class="step-label">Breed<br>Together</div>
      <span class="connector-arrow">→</span>
    </div>

    
    <div class="step-card step" data-step="3">
      <div class="step-badge">4</div>
      <div class="icon-box">🌾🌾<span class="icon-sub">✨</span></div>
      <div class="step-label">Select Best<br>Offspring</div>
    </div>
  </div>

  
  <div class="loop-banner">
    <span>↻</span>
    <span>Repeat cycle over many generations</span>
  </div>

  
  <div class="controls">
    <button class="btn-ctrl" id="playBtn" aria-label="Play or Pause cycle">
      <span id="playIcon">⏸</span>
    </button>
    <div class="dots-container">
      <div class="dot active" data-step="0"></div>
      <div class="dot" data-step="1"></div>
      <div class="dot" data-step="2"></div>
      <div class="dot" data-step="3"></div>
    </div>
  </div>

  <script>
    const $ = (selector) => document.querySelector(selector);
    const $$ = (selector) => document.querySelectorAll(selector);

    const cards = $$('.step');
    const dots = $$('.dot');
    const playBtn = $('#playBtn');
    const playIcon = $('#playIcon');

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

    const player = new StepPlayer('.step', {
      interval: 3200,
      onChange: (idx) => {
        updateActiveState(idx);
      }
    });

    player.start();

    // Click cards directly
    cards.forEach((card, idx) => {
      onTap(card, () => {
        player.goTo(idx);
      });
    });

    // Click dots
    dots.forEach((dot, idx) => {
      onTap(dot, () => {
        player.goTo(idx);
      });
    });

    // Play/Pause toggle
    onTap(playBtn, () => {
      player.toggle();
      playIcon.textContent = player.playing ? '⏸' : '▶';
    });
  </script>
</body>
</html>

UK-GCSE-SCIENCE-BIO-IVE-04-01

Aligned learning resources

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