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

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 16px 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      user-select: none;
    }

    .container {
      width: 100%;
      max-width: 620px;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .counter-bar {
      display: flex;
      align-items: baseline;
      justify-content: center;
      gap: 10px;
      margin-bottom: 16px;
      font-weight: 700;
      font-size: 14px;
      color: #475569;
      text-transform: uppercase;
      letter-spacing: 0.8px;
    }

    .counter-value {
      font-size: 36px;
      font-weight: 800;
      color: #059669;
      min-width: 120px;
      text-align: left;
      font-variant-numeric: tabular-nums;
      transition: color 0.3s ease;
    }

    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      width: 100%;
      margin-bottom: 18px;
    }

    .stage-card {
      border-radius: 16px;
      padding: 14px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      cursor: pointer;
      border: 2px solid transparent;
      transition: box-shadow 0.25s ease, opacity 0.25s ease, border-color 0.25s ease;
      opacity: 0.65;
      position: relative;
    }

    .stage-card.active {
      opacity: 1;
    }

    /* Card 1: Thriving */
    .card-thriving {
      background: #ecfdf5;
      border-color: #a7f3d0;
      color: #064e3b;
    }
    .card-thriving .stage-num {
      color: #047857;
    }
    .card-thriving .stage-desc {
      color: #065f46;
    }
    .card-thriving.active {
      border-color: #059669;
      box-shadow: 0 0 0 3px #10b981, 0 8px 20px rgba(16, 185, 129, 0.22);
    }

    /* Card 2: Endangered */
    .card-endangered {
      background: #fffbeb;
      border-color: #fde68a;
      color: #7c2d12;
    }
    .card-endangered .stage-num {
      color: #b45309;
    }
    .card-endangered .stage-desc {
      color: #9a3412;
    }
    .card-endangered.active {
      border-color: #d97706;
      box-shadow: 0 0 0 3px #f59e0b, 0 8px 20px rgba(245, 158, 11, 0.22);
    }

    /* Card 3: Extinct */
    .card-extinct {
      background: #1e293b;
      border-color: #334155;
      color: #f8fafc;
    }
    .card-extinct .stage-num {
      color: #94a3b8;
    }
    .card-extinct .stage-desc {
      color: #e2e8f0;
    }
    .card-extinct.active {
      border-color: #ef4444;
      box-shadow: 0 0 0 3px #ef4444, 0 8px 20px rgba(239, 68, 68, 0.28);
    }

    .stage-num {
      font-size: 11px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.6px;
      margin-bottom: 4px;
    }

    .stage-title {
      font-size: 16px;
      font-weight: 800;
      margin-bottom: 12px;
      line-height: 1.2;
    }

    .icons-area {
      height: 64px;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 4px;
      margin-bottom: 10px;
    }

    .animal-icon {
      font-size: 22px;
      line-height: 1;
      display: inline-block;
    }

    .gentle-pulse {
      animation: gentlePulse 1.8s ease-in-out infinite;
    }

    .faded-icon {
      opacity: 0.38;
      filter: grayscale(0.75);
    }

    .slash-box {
      position: relative;
      font-size: 34px;
      line-height: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .slash-box .faded-icon {
      opacity: 0.42;
      filter: grayscale(1);
    }

    .slash-line {
      position: absolute;
      width: 48px;
      height: 4px;
      background: #ef4444;
      transform: rotate(-45deg);
      border-radius: 2px;
      box-shadow: 0 0 4px rgba(239, 68, 68, 0.6);
    }

    .stage-desc {
      font-size: 12px;
      font-weight: 700;
      line-height: 1.35;
      margin-top: auto;
      min-height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .controls-row {
      display: flex;
      gap: 10px;
      width: 100%;
      justify-content: center;
    }

    .btn-step {
      flex: 1;
      padding: 12px 6px;
      border: 1.5px solid #cbd5e1;
      background: #ffffff;
      border-radius: 12px;
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
      box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .btn-step.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
      box-shadow: 0 4px 10px rgba(30, 41, 69, 0.2);
    }

    @keyframes gentlePulse {
      0%, 100% {
        opacity: 1;
        transform: scale(1);
      }
      50% {
        opacity: 0.45;
        transform: scale(0.94);
      }
    }

    @media (max-width: 450px) {
      .counter-value { font-size: 28px; min-width: 95px; }
      .counter-bar { font-size: 13px; margin-bottom: 12px; }
      .cards-grid { gap: 8px; margin-bottom: 14px; }
      .stage-card { padding: 10px 4px; border-radius: 12px; }
      .stage-title { font-size: 13px; margin-bottom: 8px; }
      .stage-num { font-size: 10px; }
      .stage-desc { font-size: 10.5px; line-height: 1.25; min-height: 38px; }
      .animal-icon { font-size: 17px; }
      .slash-box { font-size: 26px; }
      .slash-line { width: 36px; height: 3px; }
      .icons-area { height: 50px; margin-bottom: 6px; }
      .btn-step { font-size: 11.5px; padding: 10px 3px; border-radius: 10px; }
    }
  </style>
</head>
<body>

  <div class="container">
    <div class="counter-bar">
      <span>Population</span>
      <span class="counter-value" id="popCounter">10,000</span>
    </div>

    <div class="cards-grid">
      
      <div class="stage-card card-thriving active" id="card0" onclick="goToStep(0)">
        <div class="stage-num">Stage 1</div>
        <div class="stage-title">Thriving</div>
        <div class="icons-area">
          <span class="animal-icon">🐅</span>
          <span class="animal-icon">🐅</span>
          <span class="animal-icon">🐅</span>
          <span class="animal-icon">🐅</span>
          <span class="animal-icon">🐅</span>
        </div>
        <div class="stage-desc">Many alive in the wild</div>
      </div>

      
      <div class="stage-card card-endangered" id="card1" onclick="goToStep(1)">
        <div class="stage-num">Stage 2</div>
        <div class="stage-title">Endangered</div>
        <div class="icons-area">
          <span class="animal-icon gentle-pulse">🐅</span>
          <span class="animal-icon faded-icon">🐅</span>
          <span class="animal-icon faded-icon">🐅</span>
          <span class="animal-icon faded-icon">🐅</span>
          <span class="animal-icon faded-icon">🐅</span>
        </div>
        <div class="stage-desc">Very few left — at risk!</div>
      </div>

      
      <div class="stage-card card-extinct" id="card2" onclick="goToStep(2)">
        <div class="stage-num">Stage 3</div>
        <div class="stage-title">Extinct</div>
        <div class="icons-area">
          <div class="slash-box">
            <span class="animal-icon faded-icon">🐅</span>
            <div class="slash-line"></div>
          </div>
        </div>
        <div class="stage-desc">0 left on Earth — Gone Forever</div>
      </div>
    </div>

    <div class="controls-row">
      <button class="btn-step active" id="btn0" onclick="goToStep(0)">1. Thriving</button>
      <button class="btn-step" id="btn1" onclick="goToStep(1)">2. Endangered</button>
      <button class="btn-step" id="btn2" onclick="goToStep(2)">3. Extinct</button>
    </div>
  </div>

  <script>
    const pops = [10000, 25, 0];
    const colors = ['#059669', '#d97706', '#ef4444'];
    let currentStep = 0;
    let animId = null;

    function animateCount(start, end, duration) {
      if (animId) clearInterval(animId);
      const startTime = Date.now();
      const el = document.getElementById('popCounter');
      
      animId = setInterval(() => {
        const elapsed = Date.now() - startTime;
        const progress = Math.min(elapsed / duration, 1);
        const ease = 1 - Math.pow(1 - progress, 3);
        const current = Math.round(start + (end - start) * ease);
        
        el.textContent = current.toLocaleString();
        
        if (progress >= 1) {
          clearInterval(animId);
          el.textContent = end.toLocaleString();
        }
      }, 20);
    }

    function goToStep(idx) {
      if (idx === currentStep && document.getElementById('popCounter').textContent === pops[idx].toLocaleString()) return;
      
      const prevVal = pops[currentStep];
      currentStep = idx;

      for (let i = 0; i < 3; i++) {
        document.getElementById(`card${i}`).classList.toggle('active', i === idx);
        document.getElementById(`btn${i}`).classList.toggle('active', i === idx);
      }

      const counterEl = document.getElementById('popCounter');
      counterEl.style.color = colors[idx];
      animateCount(prevVal, pops[idx], 400);
    }

    // Auto-advance demonstration loop
    let loopInterval = setInterval(() => {
      goToStep((currentStep + 1) % 3);
    }, 4500);

    // Stop auto-advance once user interacts
    document.body.addEventListener('pointerdown', () => {
      clearInterval(loopInterval);
    }, { once: true });
  </script>
</body>
</html>

What Does Extinct Mean?

<!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;
    }

    body {
      background: transparent;
      color: #1e2945;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 680px;
      margin: 0 auto;
    }

    /* Interactive filter buttons */
    .controls {
      display: flex;
      justify-content: center;
      gap: 8px;
      flex-wrap: wrap;
    }

    .filter-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 5px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .filter-btn.active, .filter-btn:hover {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
    }

    /* Comparison Grid */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      position: relative;
    }

    /* Middle divider line */
    .comparison-grid::after {
      content: '';
      position: absolute;
      top: 0;
      bottom: 0;
      left: 50%;
      width: 1px;
      background: #e2e8f0;
      transform: translateX(-50%);
    }

    .column {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    /* Status Badges */
    .badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 6px 10px;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.02em;
      text-align: center;
    }

    .badge-endangered {
      background: #d1fae5;
      color: #065f46;
      border: 1px solid #6ee7b7;
    }

    .badge-extinct {
      background: #ffe4e6;
      color: #9f1239;
      border: 1px solid #fecdd3;
    }

    /* Visual hero cards */
    .visual-box {
      border-radius: 12px;
      padding: 12px;
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 90px;
      position: relative;
    }

    .visual-endangered {
      background: #f0fdf4;
      border: 1px dashed #86efac;
    }

    .visual-extinct {
      background: #fff1f2;
      border: 1px dashed #fca5a5;
    }

    .animal-emoji {
      font-size: 36px;
      line-height: 1;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .faded {
      opacity: 0.35;
      filter: grayscale(80%);
    }

    .cross-mark {
      font-size: 20px;
      color: #e11d48;
      font-weight: 900;
    }

    .pulse-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: #10b981;
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
    }

    /* Metric Tiles */
    .metric-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .metric-tile {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 8px 10px;
      font-size: 13px;
      transition: all 0.2s ease;
      cursor: pointer;
    }

    .metric-tile.highlight {
      border-color: #3b82f6;
      box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
    }

    .metric-label {
      font-size: 10px;
      text-transform: uppercase;
      font-weight: 700;
      color: #64748b;
      margin-bottom: 2px;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .metric-value {
      font-weight: 700;
      font-size: 13px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .endangered-val {
      color: #047857;
    }

    .extinct-val {
      color: #be123c;
    }

    .metric-desc {
      font-size: 11px;
      color: #64748b;
      margin-top: 2px;
      font-weight: 500;
    }

    /* Key Takeaway Banner */
    .takeaway-ribbon {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      border-left: 4px solid #3b82f6;
      border-radius: 8px;
      padding: 10px 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .takeaway-icon {
      font-size: 20px;
      flex-shrink: 0;
    }

    .takeaway-text {
      font-size: 12px;
      font-weight: 600;
      color: #1e2945;
      line-height: 1.4;
    }

    @media (max-width: 440px) {
      .comparison-grid {
        gap: 8px;
      }
      .badge {
        font-size: 11px;
        padding: 5px 6px;
      }
      .animal-emoji {
        font-size: 28px;
      }
      .metric-tile {
        padding: 6px 8px;
      }
      .metric-value {
        font-size: 12px;
      }
      .takeaway-text {
        font-size: 11px;
      }
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <button class="filter-btn active" onclick="setHighlight('all', this)">Show All</button>
    <button class="filter-btn" onclick="setHighlight('pop', this)">1. Population</button>
    <button class="filter-btn" onclick="setHighlight('rep', this)">2. Reproduction</button>
    <button class="filter-btn" onclick="setHighlight('out', this)">3. Recovery</button>
  </div>

  
  <div class="comparison-grid">
    
    
    <div class="column">
      <div class="badge badge-endangered">
        <span class="pulse-dot"></span> ENDANGERED
      </div>

      <div class="visual-box visual-endangered">
        <div class="animal-emoji">
          <span>🐼</span>
          <span style="font-size: 20px;">🐾</span>
        </div>
        <span style="font-size: 11px; font-weight: 700; color: #065f46; margin-top: 4px;">Living Lineage</span>
      </div>

      <div class="metric-list">
        <div class="metric-tile" data-cat="pop" onclick="highlightCategory('pop')">
          <div class="metric-label">👥 Population</div>
          <div class="metric-value endangered-val">Very Few Left</div>
          <div class="metric-desc">~1,800 in wild</div>
        </div>

        <div class="metric-tile" data-cat="rep" onclick="highlightCategory('rep')">
          <div class="metric-label">🌱 Reproduction</div>
          <div class="metric-value endangered-val">Parents Alive</div>
          <div class="metric-desc">Can give birth</div>
        </div>

        <div class="metric-tile" data-cat="out" onclick="highlightCategory('out')">
          <div class="metric-label">🔄 Future</div>
          <div class="metric-value endangered-val">Can Recover</div>
          <div class="metric-desc">Reversible loss</div>
        </div>
      </div>
    </div>

    
    <div class="column">
      <div class="badge badge-extinct">
        <span>⚰️</span> EXTINCT
      </div>

      <div class="visual-box visual-extinct">
        <div class="animal-emoji">
          <span class="faded">🦤</span>
          <span class="cross-mark">✕</span>
        </div>
        <span style="font-size: 11px; font-weight: 700; color: #9f1239; margin-top: 4px;">Broken Lineage</span>
      </div>

      <div class="metric-list">
        <div class="metric-tile" data-cat="pop" onclick="highlightCategory('pop')">
          <div class="metric-label">👥 Population</div>
          <div class="metric-value extinct-val">Zero (0) Alive</div>
          <div class="metric-desc">None on Earth</div>
        </div>

        <div class="metric-tile" data-cat="rep" onclick="highlightCategory('rep')">
          <div class="metric-label">🌱 Reproduction</div>
          <div class="metric-value extinct-val">No Parents Left</div>
          <div class="metric-desc">Chain is broken</div>
        </div>

        <div class="metric-tile" data-cat="out" onclick="highlightCategory('out')">
          <div class="metric-label">🔄 Future</div>
          <div class="metric-value extinct-val">Gone Forever</div>
          <div class="metric-desc">Permanent loss</div>
        </div>
      </div>
    </div>

  </div>

  
  <div class="takeaway-ribbon">
    <div class="takeaway-icon">💡</div>
    <div class="takeaway-text">
      <strong>Key Rule:</strong> Extinction is permanent because living things must have <strong>living parents</strong> to reproduce.
    </div>
  </div>

  <script>
    function setHighlight(category, buttonEl) {
      // Update active button
      document.querySelectorAll('.filter-btn').forEach(btn => btn.classList.remove('active'));
      if (buttonEl) {
        buttonEl.classList.add('active');
      }

      // Update tile highlights
      const tiles = document.querySelectorAll('.metric-tile');
      tiles.forEach(tile => {
        if (category === 'all') {
          tile.classList.remove('highlight');
          tile.style.opacity = '1';
        } else if (tile.dataset.cat === category) {
          tile.classList.add('highlight');
          tile.style.opacity = '1';
        } else {
          tile.classList.remove('highlight');
          tile.style.opacity = '0.4';
        }
      });
    }

    function highlightCategory(category) {
      const btn = Array.from(document.querySelectorAll('.filter-btn')).find(b => {
        if (category === 'pop') return b.textContent.includes('Population');
        if (category === 'rep') return b.textContent.includes('Reproduction');
        if (category === 'out') return b.textContent.includes('Recovery');
        return false;
      });
      setHighlight(category, btn);
    }
  </script>
</body>
</html>

<!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, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      padding: 10px;
      display: flex;
      justify-content: center;
      align-items: flex-start;
    }

    .bone-container {
      width: 100%;
      max-width: 520px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .bone-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 10px;
      padding: 10px 12px;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
    }

    .bone-card-header {
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 6px;
    }

    .tag-heavy {
      font-size: 11.5px;
      font-weight: 700;
      padding: 2px 8px;
      background: #fee2e2;
      color: #991b1b;
      border-radius: 12px;
      border: 1px solid #fecaca;
    }

    .tag-light {
      font-size: 11.5px;
      font-weight: 700;
      padding: 2px 8px;
      background: #e0f2fe;
      color: #0369a1;
      border-radius: 12px;
      border: 1px solid #bae6fd;
    }

    .svg-wrap {
      width: 100%;
      overflow: visible;
    }

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

    .label-text {
      font-size: 14.5px;
      font-weight: 700;
      fill: #1e2945;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    .label-sub {
      font-size: 11.5px;
      font-weight: 600;
      fill: #64748b;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    .leader-line {
      stroke: #64748b;
      stroke-width: 1.5;
      stroke-dasharray: 3 2;
    }

    /* Gentle, smooth airflow animation without flickering */
    @keyframes airFlow {
      0% {
        transform: translateX(-40px);
        opacity: 0;
      }
      25% {
        opacity: 0.75;
      }
      75% {
        opacity: 0.75;
      }
      100% {
        transform: translateX(250px);
        opacity: 0;
      }
    }

    .air-particle {
      animation: airFlow 4.5s ease-in-out infinite;
    }

    .air-particle-d1 {
      animation: airFlow 4.5s ease-in-out infinite;
      animation-delay: 1.5s;
    }

    .air-particle-d2 {
      animation: airFlow 4.5s ease-in-out infinite;
      animation-delay: 3s;
    }

    @keyframes pulseGlow {
      0%, 100% {
        fill-opacity: 0.15;
      }
      50% {
        fill-opacity: 0.32;
      }
    }

    .air-chamber-glow {
      animation: pulseGlow 3.5s ease-in-out infinite;
    }

    .card-footer {
      margin-top: 6px;
      padding-top: 6px;
      border-top: 1px solid #f1f5f9;
      font-size: 11.5px;
      color: #475569;
      line-height: 1.35;
    }

    @media (max-width: 380px) {
      .bone-card-header {
        font-size: 13px;
      }
      .label-text {
        font-size: 15px;
      }
      .label-sub {
        font-size: 12px;
      }
    }
  </style>
</head>
<body>

  <div class="bone-container">
    
    
    <div class="bone-card">
      <div class="bone-card-header">
        <span>Mammal Bone</span>
        <span class="tag-heavy">Solid &amp; Heavy</span>
      </div>

      <div class="svg-wrap">
        <svg viewBox="0 0 440 92">
          <defs>
            <linearGradient id="boneWallMammal" x1="0%" y1="0%" x2="0%" y2="100%">
              <stop offset="0%" stop-color="#f5f0e6"/>
              <stop offset="50%" stop-color="#e2d8c3"/>
              <stop offset="100%" stop-color="#cfbe9f"/>
            </linearGradient>
            <linearGradient id="marrowGrad" x1="0%" y1="0%" x2="100%" y2="0%">
              <stop offset="0%" stop-color="#f43f5e"/>
              <stop offset="50%" stop-color="#fda4af"/>
              <stop offset="100%" stop-color="#e11d48"/>
            </linearGradient>
            <pattern id="marrowPattern" width="14" height="14" patternUnits="userSpaceOnUse">
              <circle cx="7" cy="7" r="4" fill="#f43f5e" fill-opacity="0.8"/>
              <circle cx="2" cy="2" r="2.2" fill="#be123c" fill-opacity="0.85"/>
              <circle cx="12" cy="11" r="2.5" fill="#9f1239" fill-opacity="0.9"/>
              <circle cx="7" cy="7" r="1.8" fill="#ffe4e6"/>
            </pattern>
          </defs>

          
          <rect x="20" y="14" width="260" height="64" rx="14" fill="url(#boneWallMammal)" stroke="#b8a88a" stroke-width="2"/>
          
          
          <rect x="30" y="24" width="240" height="44" rx="8" fill="url(#marrowGrad)"/>
          <rect x="30" y="24" width="240" height="44" rx="8" fill="url(#marrowPattern)"/>

          
          <ellipse cx="32" cy="46" rx="14" ry="32" fill="#e2d8c3" stroke="#b8a88a" stroke-width="2"/>
          <ellipse cx="32" cy="46" rx="7.5" ry="21" fill="#be123c"/>

          
          <line x1="175" y1="46" x2="295" y2="46" class="leader-line"/>
          <circle cx="175" cy="46" r="3.5" fill="#1e2945"/>
          <text x="302" y="44" class="label-text">Dense Marrow</text>
          <text x="302" y="58" class="label-sub">Fat &amp; Blood Cells</text>
        </svg>
      </div>
      <div class="card-footer">
        Solid interior provides maximum compressive strength for load-bearing terrestrial weight.
      </div>
    </div>

    
    <div class="bone-card">
      <div class="bone-card-header">
        <span>Theropod &amp; Bird Bone</span>
        <span class="tag-light">Hollow &amp; Light</span>
      </div>

      <div class="svg-wrap">
        <svg viewBox="0 0 440 100">
          <defs>
            <linearGradient id="boneWallBird" x1="0%" y1="0%" x2="0%" y2="100%">
              <stop offset="0%" stop-color="#fbf8f1"/>
              <stop offset="50%" stop-color="#ebdcc4"/>
              <stop offset="100%" stop-color="#d6c3a1"/>
            </linearGradient>
            <clipPath id="innerChamberClip">
              <rect x="30" y="24" width="240" height="44" rx="8"/>
            </clipPath>
          </defs>

          
          <rect x="20" y="14" width="260" height="64" rx="14" fill="url(#boneWallBird)" stroke="#b8a88a" stroke-width="2"/>

          
          <rect x="30" y="24" width="240" height="44" rx="8" fill="#e0f2fe"/>
          <rect x="30" y="24" width="240" height="44" rx="8" fill="#38bdf8" class="air-chamber-glow"/>

          
          <g clip-path="url(#innerChamberClip)">
            
            <line x1="45" y1="24" x2="75" y2="68" stroke="#c4b18f" stroke-width="3" stroke-linecap="round"/>
            <line x1="85" y1="24" x2="55" y2="68" stroke="#c4b18f" stroke-width="3" stroke-linecap="round"/>
            
            <line x1="105" y1="24" x2="135" y2="68" stroke="#c4b18f" stroke-width="3" stroke-linecap="round"/>
            <line x1="145" y1="24" x2="115" y2="68" stroke="#c4b18f" stroke-width="3" stroke-linecap="round"/>

            <line x1="165" y1="24" x2="195" y2="68" stroke="#c4b18f" stroke-width="3" stroke-linecap="round"/>
            <line x1="205" y1="24" x2="175" y2="68" stroke="#c4b18f" stroke-width="3" stroke-linecap="round"/>

            <line x1="225" y1="24" x2="255" y2="68" stroke="#c4b18f" stroke-width="3" stroke-linecap="round"/>
            <line x1="265" y1="24" x2="235" y2="68" stroke="#c4b18f" stroke-width="3" stroke-linecap="round"/>

            
            <g>
              <g class="air-particle">
                <ellipse cx="40" cy="38" rx="16" ry="4" fill="#0284c7"/>
                <ellipse cx="36" cy="54" rx="13" ry="3.5" fill="#0284c7"/>
              </g>
              <g class="air-particle-d1">
                <ellipse cx="40" cy="46" rx="18" ry="4.5" fill="#0284c7"/>
                <ellipse cx="34" cy="36" rx="14" ry="3.5" fill="#0284c7"/>
              </g>
              <g class="air-particle-d2">
                <ellipse cx="40" cy="52" rx="16" ry="4" fill="#0284c7"/>
                <ellipse cx="38" cy="40" rx="13" ry="3.5" fill="#0284c7"/>
              </g>
            </g>
          </g>

          
          <ellipse cx="32" cy="46" rx="14" ry="32" fill="#ebdcc4" stroke="#b8a88a" stroke-width="2"/>
          <ellipse cx="32" cy="46" rx="7.5" ry="21" fill="#bae6fd" stroke="#93c5fd" stroke-width="1.5"/>

          
          <line x1="125" y1="34" x2="295" y2="28" class="leader-line"/>
          <circle cx="125" cy="34" r="3.5" fill="#1e2945"/>
          <text x="302" y="26" class="label-text">Bone Struts</text>
          <text x="302" y="40" class="label-sub">Trabeculae braces</text>

          
          <line x1="195" y1="58" x2="295" y2="74" class="leader-line"/>
          <circle cx="195" cy="58" r="3.5" fill="#0284c7"/>
          <text x="302" y="74" class="label-text" fill="#0284c7">Air Pockets</text>
          <text x="302" y="88" class="label-sub">Pneumatic spaces</text>
        </svg>
      </div>
      <div class="card-footer">
        Internal air sacs &amp; thin trusses reduce skeletal mass while maintaining bending strength.
      </div>
    </div>

  </div>

</body>
</html>

How Birds Are Linked to Theropod Dinosaurs

<!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;
      color: #1e2945;
      background: transparent;
      padding: 10px 6px;
    }
    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      width: 100%;
      max-width: 680px;
      margin: 0 auto;
    }
    @media (max-width: 520px) {
      .grid { 
        grid-template-columns: 1fr; 
        gap: 18px;
      }
    }
    .panel {
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
      background: transparent;
      border: none;
      padding: 0;
    }
    .panel-title {
      font-size: 13px;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 6px;
      text-transform: uppercase;
      letter-spacing: 0.6px;
      text-align: center;
    }
    .foot-stage {
      width: 100%;
      height: 165px;
      display: flex;
      justify-content: space-around;
      align-items: stretch;
      gap: 8px;
    }
    .foot-col {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      flex: 1;
      height: 100%;
    }
    .foot-svg-wrap {
      width: 100%;
      height: 138px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .foot-svg-wrap svg {
      width: 100%;
      height: 100%;
      max-height: 138px;
    }
    .foot-label {
      font-size: 11.5px;
      font-weight: 700;
      color: #334155;
      text-align: center;
      line-height: 1.2;
      margin-top: 2px;
    }
    .wrist-container {
      width: 100%;
      height: 165px;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .wrist-container svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }
    .wrist-controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-top: 8px;
      height: 28px;
    }
    .btn {
      background: #0284c7;
      color: #ffffff;
      border: none;
      border-radius: 6px;
      padding: 5px 14px;
      font-size: 11.5px;
      font-weight: 700;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 1px 2px rgba(2,132,199,0.25);
      transition: background-color 0.15s ease, opacity 0.15s ease;
    }
    .btn:hover {
      background: #0369a1;
    }
    .btn:active {
      background: #075985;
    }
    .badge-wrap {
      margin-top: 8px;
      height: 28px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      background: #e0f2fe;
      border: 1px solid #bae6fd;
      color: #0369a1;
      font-size: 11px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 6px;
      white-space: nowrap;
    }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="panel">
      <div class="panel-title">Foot Anatomy</div>
      <div class="foot-stage">
        
        
        <div class="foot-col">
          <div class="foot-svg-wrap">
            <svg viewBox="0 0 130 140" aria-label="Theropod Foot">
              
              <path d="M 65 10 L 65 62" stroke="#94a3b8" stroke-width="7" stroke-linecap="round"/>
              
              
              <path d="M 65 62 L 32 102" stroke="#22b7ff" stroke-width="5.5" stroke-linecap="round"/>
              <path d="M 32 102 Q 25 114 16 117" fill="none" stroke="#0284c7" stroke-width="3.5" stroke-linecap="round"/>
              <circle cx="27" cy="104" r="8" fill="#0284c7"/>
              <text x="27" y="108" fill="#ffffff" font-size="9.5" font-weight="bold" text-anchor="middle">II</text>

              
              <path d="M 65 62 L 65 110" stroke="#22b7ff" stroke-width="5.5" stroke-linecap="round"/>
              <path d="M 65 110 Q 65 125 61 130" fill="none" stroke="#0284c7" stroke-width="3.5" stroke-linecap="round"/>
              <circle cx="65" cy="111" r="8" fill="#0284c7"/>
              <text x="65" y="115" fill="#ffffff" font-size="9.5" font-weight="bold" text-anchor="middle">III</text>

              
              <path d="M 65 62 L 98 102" stroke="#22b7ff" stroke-width="5.5" stroke-linecap="round"/>
              <path d="M 98 102 Q 105 114 114 117" fill="none" stroke="#0284c7" stroke-width="3.5" stroke-linecap="round"/>
              <circle cx="103" cy="104" r="8" fill="#0284c7"/>
              <text x="103" y="108" fill="#ffffff" font-size="9.5" font-weight="bold" text-anchor="middle">IV</text>
            </svg>
          </div>
          <div class="foot-label">Theropod</div>
        </div>

        
        <div class="foot-col">
          <div class="foot-svg-wrap">
            <svg viewBox="0 0 130 140" aria-label="Bird Foot">
              
              <path d="M 65 10 L 65 62" stroke="#94a3b8" stroke-width="5.5" stroke-linecap="round"/>
              
              
              <path d="M 65 62 L 84 40" stroke="#94a3b8" stroke-width="3.5" stroke-linecap="round"/>
              <path d="M 84 40 Q 90 35 94 37" fill="none" stroke="#64748b" stroke-width="2.5" stroke-linecap="round"/>
              <text x="96" y="32" fill="#64748b" font-size="8.5" font-weight="700" text-anchor="middle">I</text>

              
              <path d="M 65 62 L 32 102" stroke="#22b7ff" stroke-width="5" stroke-linecap="round"/>
              <path d="M 32 102 Q 25 114 16 117" fill="none" stroke="#0284c7" stroke-width="3.5" stroke-linecap="round"/>
              <circle cx="27" cy="104" r="8" fill="#0284c7"/>
              <text x="27" y="108" fill="#ffffff" font-size="9.5" font-weight="bold" text-anchor="middle">II</text>

              
              <path d="M 65 62 L 65 110" stroke="#22b7ff" stroke-width="5" stroke-linecap="round"/>
              <path d="M 65 110 Q 65 125 61 130" fill="none" stroke="#0284c7" stroke-width="3.5" stroke-linecap="round"/>
              <circle cx="65" cy="111" r="8" fill="#0284c7"/>
              <text x="65" y="115" fill="#ffffff" font-size="9.5" font-weight="bold" text-anchor="middle">III</text>

              
              <path d="M 65 62 L 98 102" stroke="#22b7ff" stroke-width="5" stroke-linecap="round"/>
              <path d="M 98 102 Q 105 114 114 117" fill="none" stroke="#0284c7" stroke-width="3.5" stroke-linecap="round"/>
              <circle cx="103" cy="104" r="8" fill="#0284c7"/>
              <text x="103" y="108" fill="#ffffff" font-size="9.5" font-weight="bold" text-anchor="middle">IV</text>
            </svg>
          </div>
          <div class="foot-label">Bird (Chicken)</div>
        </div>

      </div>
      <div class="badge-wrap">
        <div class="badge">3 Forward Weight-Bearing Toes (II, III, IV)</div>
      </div>
    </div>

    
    <div class="panel">
      <div class="panel-title">Swivel Wrist</div>
      <div class="wrist-container">
        <svg viewBox="0 0 250 165" id="wristSvg">
          
          <text id="wristStateLabel" x="195" y="24" fill="#0284c7" font-size="11" font-weight="700" text-anchor="middle">Wing / Hand (Extended)</text>

          
          <path d="M 216 72 A 56 56 0 0 1 125 114" fill="none" stroke="#0284c7" stroke-width="1.8" stroke-dasharray="3,3" opacity="0.75"/>
          <polygon points="126,108 118,116 128,119" fill="#0284c7" opacity="0.85"/>

          
          <circle cx="34" cy="120" r="5.5" fill="#64748b"/>
          <text x="34" y="139" fill="#475569" font-size="9.5" font-weight="700" text-anchor="middle">Shoulder</text>

          
          <line id="humerus" x1="34" y1="120" x2="95" y2="64" stroke="#1e2945" stroke-width="6.5" stroke-linecap="round"/>
          <text x="56" y="84" fill="#64748b" font-size="9" font-weight="600" text-anchor="middle">Humerus</text>

          
          <circle id="elbow" cx="95" cy="64" r="4.5" fill="#64748b"/>

          
          <line id="radius" x1="95" y1="61" x2="160" y2="69" stroke="#475569" stroke-width="4.5" stroke-linecap="round"/>
          <line id="ulna" x1="95" y1="67" x2="160" y2="75" stroke="#64748b" stroke-width="4.5" stroke-linecap="round"/>
          <text x="127" y="54" fill="#64748b" font-size="9" font-weight="600" text-anchor="middle">Forearm</text>

          
          <g id="wristGroup" transform="translate(160, 72)">
            
            <g id="handBone" transform="rotate(0)">
              
              <line x1="0" y1="0" x2="56" y2="0" stroke="#22b7ff" stroke-width="5" stroke-linecap="round"/>
              
              <line x1="22" y1="0" x2="43" y2="-9" stroke="#22b7ff" stroke-width="3" stroke-linecap="round"/>
              <line x1="28" y1="0" x2="50" y2="7" stroke="#22b7ff" stroke-width="3" stroke-linecap="round"/>
              
              <path d="M 56 0 Q 64 2 62 8" fill="none" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round"/>
              <path d="M 43 -9 Q 49 -7 47 -2" fill="none" stroke="#0284c7" stroke-width="2.2" stroke-linecap="round"/>
            </g>

            
            <circle cx="0" cy="0" r="6.5" fill="#0284c7"/>
            <circle cx="0" cy="0" r="2.2" fill="#ffffff"/>
            <text x="0" y="-12" fill="#0284c7" font-size="9" font-weight="700" text-anchor="middle">Swivel Carpal</text>
          </g>
        </svg>
      </div>

      <div class="wrist-controls">
        <button class="btn" id="toggleBtn" onclick="toggleFold()" aria-label="Toggle Wing Motion">
          <span id="btnIcon">▶</span> <span id="btnText">Fold Wing</span>
        </button>
      </div>
    </div>
  </div>

  <script>
    let folded = false;
    let autoPlay = true;
    let angle = 0;
    let targetAngle = 0;
    let animFrame;

    const handBone = document.getElementById('handBone');
    const wristStateLabel = document.getElementById('wristStateLabel');
    const btnText = document.getElementById('btnText');
    const btnIcon = document.getElementById('btnIcon');

    function animate() {
      angle += (targetAngle - angle) * 0.12;
      handBone.setAttribute('transform', `rotate(${angle})`);

      if (Math.abs(targetAngle - angle) > 0.2) {
        animFrame = requestAnimationFrame(animate);
      } else {
        angle = targetAngle;
        handBone.setAttribute('transform', `rotate(${angle})`);
      }
    }

    function setFoldState(isFolded) {
      folded = isFolded;
      targetAngle = folded ? 135 : 0;
      btnText.textContent = folded ? "Extend Arm" : "Fold Wing";
      btnIcon.textContent = folded ? "↺" : "▶";
      wristStateLabel.textContent = folded ? "Wing / Hand (Folded)" : "Wing / Hand (Extended)";
      cancelAnimationFrame(animFrame);
      animate();
    }

    function toggleFold() {
      autoPlay = false;
      setFoldState(!folded);
    }

    // Auto-cycle demonstration
    setInterval(() => {
      if (autoPlay) {
        setFoldState(!folded);
      }
    }, 3200);
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: transparent;
      color: #1e2945;
      padding: 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      user-select: none;
    }
    .main-grid {
      width: 100%;
      max-width: 540px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .header-row {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      align-items: center;
      text-align: center;
      padding: 6px 12px;
      background: #f1f5f9;
      border-radius: 12px;
      font-weight: 700;
      font-size: 14px;
    }
    .species-col {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .species-icon {
      font-size: 20px;
    }
    .vs-tag {
      font-size: 11px;
      color: #64748b;
      font-weight: 800;
      padding: 2px 8px;
      background: #e2e8f0;
      border-radius: 20px;
    }
    .trait-list {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .trait-card {
      display: grid;
      grid-template-columns: 50px 1fr 50px;
      align-items: center;
      padding: 10px 12px;
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 10px;
      cursor: pointer;
      transition: border-color 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
    }
    .trait-card:hover {
      border-color: #94a3b8;
    }
    .trait-card.active {
      border-color: #10b981;
      background: #f0fdf4;
      box-shadow: 0 2px 8px rgba(16, 185, 129, 0.12);
    }
    .check-box {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto;
      font-weight: 900;
      font-size: 15px;
      transition: all 0.25s ease;
      background: #e2e8f0;
      color: #94a3b8;
    }
    .trait-card.active .check-box {
      background: #10b981;
      color: #ffffff;
      box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
    }
    .trait-info {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      text-align: center;
    }
    .trait-icon {
      font-size: 18px;
    }
    .trait-name {
      font-size: 14px;
      font-weight: 600;
      color: #334155;
    }
    .trait-card.active .trait-name {
      color: #065f46;
      font-weight: 700;
    }
    .controls {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-top: 4px;
      padding: 0 4px;
    }
    .btn {
      padding: 6px 14px;
      border-radius: 8px;
      border: none;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      background: #2563eb;
      color: #ffffff;
      transition: opacity 0.2s ease;
    }
    .btn:hover {
      opacity: 0.9;
    }
    .btn-outline {
      background: #f1f5f9;
      color: #475569;
    }
    .status-text {
      font-size: 12px;
      font-weight: 700;
      color: #059669;
      display: flex;
      align-items: center;
      gap: 4px;
    }
  </style>
</head>
<body>
  <div class="main-grid">
    <div class="header-row">
      <div class="species-col">
        <span class="species-icon">🦖</span>
        <span>Theropod</span>
      </div>
      <span class="vs-tag">5 / 5 SHARED</span>
      <div class="species-col">
        <span class="species-icon">🦅</span>
        <span>Modern Bird</span>
      </div>
    </div>

    <div class="trait-list" id="traitList">
      <div class="trait-card active" data-index="0">
        <div class="check-box">✓</div>
        <div class="trait-info">
          <span class="trait-icon">🦴</span>
          <span class="trait-name">Wishbone (Furcula)</span>
        </div>
        <div class="check-box">✓</div>
      </div>

      <div class="trait-card active" data-index="1">
        <div class="check-box">✓</div>
        <div class="trait-info">
          <span class="trait-icon">🫧</span>
          <span class="trait-name">Hollow Air Bones</span>
        </div>
        <div class="check-box">✓</div>
      </div>

      <div class="trait-card active" data-index="2">
        <div class="check-box">✓</div>
        <div class="trait-info">
          <span class="trait-icon">🐾</span>
          <span class="trait-name">Three-Toed Feet</span>
        </div>
        <div class="check-box">✓</div>
      </div>

      <div class="trait-card active" data-index="3">
        <div class="check-box">✓</div>
        <div class="trait-info">
          <span class="trait-icon">🔄</span>
          <span class="trait-name">Swiveling Wrist</span>
        </div>
        <div class="check-box">✓</div>
      </div>

      <div class="trait-card active" data-index="4">
        <div class="check-box">✓</div>
        <div class="trait-info">
          <span class="trait-icon">🪶</span>
          <span class="trait-name">True Feathers</span>
        </div>
        <div class="check-box">✓</div>
      </div>
    </div>

    <div class="controls">
      <button class="btn btn-outline" id="toggleAllBtn">Toggle All</button>
      <div class="status-text" id="statusLabel">
        <span>✦ Shared Heritage ✦</span>
      </div>
      <button class="btn" id="stepBtn">Next Feature →</button>
    </div>
  </div>

  <script>
    const cards = Array.from(document.querySelectorAll('.trait-card'));
    const toggleAllBtn = document.getElementById('toggleAllBtn');
    const stepBtn = document.getElementById('stepBtn');
    const statusLabel = document.getElementById('statusLabel');

    let currentStep = 0;

    function updateStatus() {
      const activeCount = cards.filter(c => c.classList.contains('active')).length;
      if (activeCount === 5) {
        statusLabel.innerHTML = '<span>✦ 100% Shared Traits ✦</span>';
      } else {
        statusLabel.textContent = `${activeCount} / 5 Traits Matched`;
      }
    }

    cards.forEach((card, idx) => {
      card.addEventListener('click', () => {
        card.classList.toggle('active');
        currentStep = idx;
        updateStatus();
      });
    });

    toggleAllBtn.addEventListener('click', () => {
      const allActive = cards.every(c => c.classList.contains('active'));
      cards.forEach(c => {
        if (allActive) {
          c.classList.remove('active');
        } else {
          c.classList.add('active');
        }
      });
      updateStatus();
    });

    stepBtn.addEventListener('click', () => {
      currentStep = (currentStep + 1) % cards.length;
      cards.forEach((c, idx) => {
        if (idx === currentStep) {
          c.classList.add('active');
        }
      });
      updateStatus();
    });

    updateStatus();
  </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>Theropod vs Bird Skeleton Comparison</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      width: 100%;
      height: auto;
      min-height: auto;
      background: #f8f9fa;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 8px 10px 12px;
      user-select: none;
      overflow-x: hidden;
    }

    .header-grid {
      width: 100%;
      max-width: 640px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
      margin-bottom: 6px;
    }

    .header-col {
      text-align: center;
      padding: 4px 6px;
      border-radius: 6px;
      background: rgba(30, 41, 69, 0.04);
    }

    .header-col h2 {
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      color: #1e2945;
      line-height: 1.2;
    }

    .header-col .sub {
      font-size: 11px;
      font-weight: 500;
      color: #556987;
      line-height: 1.2;
    }

    .svg-wrapper {
      width: 100%;
      max-width: 640px;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      margin-bottom: 4px;
    }

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

    /* Skeleton stroke styling */
    .bone {
      stroke: #1e2945;
      stroke-width: 2;
      stroke-linecap: round;
      stroke-linejoin: round;
      fill: none;
    }

    .bone-thin {
      stroke: #1e2945;
      stroke-width: 1.4;
      stroke-linecap: round;
      stroke-linejoin: round;
      fill: none;
    }

    .bone-fill {
      fill: #1e2945;
    }

    .sternum-fill {
      fill: rgba(30, 41, 69, 0.08);
      stroke: #1e2945;
      stroke-width: 1.8;
      stroke-linejoin: round;
    }

    /* Furcula steady highlighting with smooth transitions (no rapid flicker) */
    .furcula {
      stroke: #22b7ff;
      stroke-width: 4;
      stroke-linecap: round;
      stroke-linejoin: round;
      fill: none;
      filter: drop-shadow(0 0 5px rgba(34, 183, 255, 0.85));
      cursor: pointer;
      transition: stroke-width 0.5s ease, filter 0.5s ease, stroke 0.5s ease;
    }

    .furcula.active {
      stroke: #00a2f5;
      stroke-width: 6;
      filter: drop-shadow(0 0 9px rgba(0, 162, 245, 1));
    }

    /* Pointers and callout lines */
    .pointer-line {
      stroke: #0284c7;
      stroke-width: 1.6;
      stroke-dasharray: 4, 3;
      fill: none;
    }

    .pointer-dot {
      fill: #0284c7;
    }

    .callout-badge-bg {
      fill: #ffffff;
      stroke: #0284c7;
      stroke-width: 1.5;
      filter: drop-shadow(0 2px 4px rgba(2, 132, 199, 0.15));
    }

    .callout-text {
      font-size: 13px;
      font-weight: 700;
      fill: #0284c7;
      text-anchor: middle;
      font-family: inherit;
    }

    /* Interactive controls and info banner */
    .controls {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      width: 100%;
      max-width: 640px;
    }

    .label-badge {
      background: #ffffff;
      border: 1.5px solid #22b7ff;
      border-radius: 20px;
      padding: 5px 14px;
      font-size: 12px;
      font-weight: 700;
      color: #0284c7;
      box-shadow: 0 2px 5px rgba(34, 183, 255, 0.2);
      display: inline-flex;
      align-items: center;
      gap: 7px;
      cursor: pointer;
      transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    }

    .label-badge:hover {
      background: #f0f9ff;
      border-color: #0284c7;
    }

    .dot-cyan {
      width: 8px;
      height: 8px;
      background: #22b7ff;
      border-radius: 50%;
      box-shadow: 0 0 5px #22b7ff;
    }

    .info-box {
      font-size: 11.5px;
      line-height: 1.4;
      color: #334155;
      text-align: center;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 6px;
      padding: 6px 12px;
      width: 100%;
      max-width: 600px;
    }

    .info-box strong {
      color: #0284c7;
    }

    @media (min-width: 520px) {
      .header-col h2 {
        font-size: 14px;
      }
      .header-col .sub {
        font-size: 12px;
      }
      .label-badge {
        font-size: 13px;
        padding: 6px 16px;
      }
      .info-box {
        font-size: 12px;
        padding: 8px 14px;
      }
    }
  </style>
</head>
<body>

  
  <div class="header-grid">
    <div class="header-col">
      <h2>Theropod</h2>
      <div class="sub">e.g., Velociraptor</div>
    </div>
    <div class="header-col">
      <h2>Bird</h2>
      <div class="sub">e.g., Falcon</div>
    </div>
  </div>

  
  <div class="svg-wrapper">
    <svg viewBox="0 0 640 270" aria-label="Comparative diagram of Theropod and Bird skeletons showing the homologous wishbone (furcula)">
      
      <line x1="320" y1="12" x2="320" y2="258" stroke="#e2e8f0" stroke-width="1.5" stroke-dasharray="4,4" />

      
      <g id="theropod-skeleton">
        
        <path class="bone" d="M 45,72 L 92,62 C 104,62 112,68 114,78 C 114,88 105,92 94,92 L 48,82 Z" />
        
        <polygon points="62,71 75,69 73,77 62,77" class="bone-thin" />
        <circle cx="94" cy="74" r="5.5" class="bone-thin" />
        <circle cx="94" cy="74" r="2" class="bone-fill" />
        
        <path class="bone" d="M 46,82 L 112,82" />
        
        <path class="bone-thin" d="M 52,80 L 52,83 M 59,79 L 59,83 M 66,79 L 66,83 M 73,79 L 73,83" />

        
        <path class="bone" d="M 112,78 Q 135,84 138,112 Q 140,126 152,129" />

        
        <path class="bone" d="M 152,129 Q 185,124 220,126" />

        
        <path class="bone" d="M 220,126 Q 255,127 300,114" />
        
        <path class="bone-thin" d="M 235,128 L 240,134 M 250,127 L 255,132 M 265,124 L 270,129 M 280,120 L 285,124" />

        
        <path class="bone-thin" d="M 160,130 Q 166,149 160,168" />
        <path class="bone-thin" d="M 170,128 Q 178,151 172,172" />
        <path class="bone-thin" d="M 180,127 Q 189,151 184,170" />
        <path class="bone-thin" d="M 190,127 Q 198,149 195,166" />

        
        <path class="bone" d="M 205,122 C 215,119 230,121 240,126" />
        
        <path class="bone" d="M 220,126 L 202,170" />
        
        <path class="bone" d="M 224,128 L 244,159" />

        
        
        <path class="bone" d="M 218,126 L 195,172" />
        
        <path class="bone" d="M 195,172 L 222,222" />
        <path class="bone-thin" d="M 197,174 L 224,220" />
        
        <path class="bone" d="M 222,222 L 196,252" />
        
        <path class="bone" d="M 196,252 L 168,256 M 168,256 Q 163,256 160,260" />
        <path class="bone" d="M 196,252 L 172,264 M 172,264 Q 167,266 165,270" />
        <path class="bone" d="M 196,252 L 182,268 M 182,268 Q 179,272 178,275" />
        
        <path class="bone" d="M 192,246 Q 182,240 184,232" />

        
        
        <path class="bone-thin" d="M 148,132 L 180,140" />
        
        <path class="bone" d="M 146,134 L 130,166" />
        
        <path class="bone" d="M 130,166 L 152,188" />
        <path class="bone-thin" d="M 133,166 L 155,186" />
        
        <path class="bone-thin" d="M 152,188 L 168,191" />
        <path class="bone-thin" d="M 152,188 L 167,198" />
        <path class="bone-thin" d="M 152,188 L 162,204" />

        
        <path id="theropod-furcula" class="furcula" d="M 136,129 Q 146,150 142,162 Q 150,148 153,132" />
      </g>


      
      <g id="bird-skeleton">
        
        <path class="bone" d="M 370,76 L 416,64 C 428,64 436,72 436,84 C 434,92 424,95 414,94 L 372,81 Z" />
        
        <circle cx="414" cy="77" r="6.5" class="bone-thin" />
        <circle cx="414" cy="77" r="2.5" class="bone-fill" />
        <path class="bone" d="M 370,76 L 410,83" />

        
        <path class="bone" d="M 432,84 Q 452,94 442,116 Q 436,128 450,132" />

        
        <path class="bone" d="M 450,132 Q 482,124 520,128" />

        
        <path class="bone" d="M 520,128 L 542,122" />
        <polygon points="542,120 550,117 546,127" class="bone-thin" />

        
        <path class="sternum-fill" d="M 444,142 Q 436,176 462,188 Q 488,188 496,156 L 444,142 Z" />

        
        <path class="bone-thin" d="M 460,132 L 458,149" />
        <path class="bone-thin" d="M 470,130 L 472,159" />
        <path class="bone-thin" d="M 480,129 L 485,159" />

        
        <path class="bone" d="M 490,128 L 526,140" />

        
        
        <path class="bone" d="M 496,130 L 476,166" />
        
        <path class="bone" d="M 476,166 L 502,218" />
        
        <path class="bone" d="M 502,218 L 482,254" />
        
        <path class="bone" d="M 482,254 L 504,260 M 504,260 Q 508,261 511,265" />
        <path class="bone" d="M 482,254 L 456,259 M 456,259 Q 451,260 448,264" />
        <path class="bone" d="M 482,254 L 460,268 M 460,268 Q 456,271 453,275" />
        <path class="bone" d="M 482,254 L 470,273 M 470,273 Q 467,277 465,280" />

        
        <path class="bone-thin" d="M 446,136 L 442,148" />
        
        <path class="bone" d="M 444,134 L 484,114" />
        
        <path class="bone" d="M 484,114 L 448,144" />
        <path class="bone-thin" d="M 486,118 L 452,147" />
        
        <path class="bone" d="M 448,144 L 492,170" />
        <path class="bone-thin" d="M 454,149 L 478,166" />

        
        <path id="bird-furcula" class="furcula" d="M 436,130 Q 444,152 440,164 Q 448,150 452,134" />
      </g>


      
      
      <path class="pointer-line" d="M 215,224 L 124,224 L 124,156 L 140,156" />
      <circle cx="142" cy="156" r="3.5" class="pointer-dot" />

      
      <path class="pointer-line" d="M 425,224 L 428,224 L 428,158 L 438,158" />
      <circle cx="440" cy="158" r="3.5" class="pointer-dot" />

      
      <rect x="216" y="210" width="208" height="28" rx="14" class="callout-badge-bg" />
      <text x="320" y="228" class="callout-text">
        Furcula (Fused Clavicles)
      </text>
    </svg>
  </div>

  
  <div class="controls">
    <button class="label-badge" id="furculaBadge" aria-label="Toggle Furcula Highlight">
      <span class="dot-cyan"></span>
      <span>Wishbone (Furcula)</span>
    </button>
    <div class="info-box" id="infoText">
      <strong>Homologous Trait:</strong> Both theropod dinosaurs and modern birds possess a fused, V-shaped clavicle (the furcula or "wishbone"), providing decisive anatomical evidence that birds evolved directly from theropod dinosaurs.
    </div>
  </div>

  <script>
    const badge = document.getElementById('furculaBadge');
    const tf = document.getElementById('theropod-furcula');
    const bf = document.getElementById('bird-furcula');

    let isHighlighted = false;

    function toggleHighlight() {
      isHighlighted = !isHighlighted;
      if (isHighlighted) {
        tf.classList.add('active');
        bf.classList.add('active');
        badge.style.background = '#e0f2fe';
        badge.style.borderColor = '#0284c7';
        badge.style.boxShadow = '0 2px 8px rgba(2, 132, 199, 0.35)';
      } else {
        tf.classList.remove('active');
        bf.classList.remove('active');
        badge.style.background = '#ffffff';
        badge.style.borderColor = '#22b7ff';
        badge.style.boxShadow = '0 2px 5px rgba(34, 183, 255, 0.2)';
      }
    }

    badge.addEventListener('click', toggleHighlight);
    tf.addEventListener('click', toggleHighlight);
    bf.addEventListener('click', toggleHighlight);
  </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;
      color: #1e2945;
      background: transparent;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      user-select: none;
    }

    /* Top Banner */
    .header {
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }
    .title {
      font-size: 15px;
      font-weight: 800;
      color: #1e2945;
      letter-spacing: -0.01em;
    }
    .pill-banner {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #f0f9ff;
      border: 1px solid #bae6fd;
      color: #0369a1;
      padding: 3px 10px;
      border-radius: 999px;
      font-size: 11.5px;
      font-weight: 600;
    }

    /* Interactive Trait Pills */
    .trait-bar {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 2px;
    }
    .trait-btn {
      border: 1px solid #cbd5e1;
      background: #ffffff;
      color: #475569;
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 11px;
      font-weight: 700;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: all 0.2s ease;
    }
    .trait-btn.active {
      background: #0284c7;
      color: #ffffff;
      border-color: #0284c7;
      box-shadow: 0 1px 3px rgba(2, 132, 199, 0.3);
    }

    /* Comparison Grid */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
      align-items: stretch;
    }
    @media (max-width: 480px) {
      .comparison-grid {
        grid-template-columns: 1fr;
      }
    }

    .creature-card {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 8px 10px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }
    .creature-card.fossil {
      border-top: 3px solid #786555;
    }
    .creature-card.living {
      border-top: 3px solid #d97706;
    }

    .card-header {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      margin-bottom: 4px;
    }
    .card-title {
      font-size: 13px;
      font-weight: 800;
      color: #1e2945;
    }
    .card-tag {
      font-size: 9.5px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.03em;
      padding: 2px 6px;
      border-radius: 4px;
    }
    .tag-fossil {
      background: #ede8e3;
      color: #5c4d41;
    }
    .tag-living {
      background: #fef3c7;
      color: #92400e;
    }

    .svg-wrap {
      width: 100%;
      height: 120px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .svg-wrap svg {
      width: 100%;
      height: 100%;
    }

    .badges-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 4px;
      margin-top: 4px;
      font-size: 10.5px;
      font-weight: 600;
    }
    .badge {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 2px 6px;
      border-radius: 4px;
      color: #475569;
      white-space: nowrap;
    }
    .badge.highlight {
      font-weight: 700;
      color: #0f172a;
    }

    /* Trait Highlight Effects in SVG */
    .part-shell, .part-claws, .part-tail {
      transition: filter 0.25s ease, stroke-width 0.25s ease, stroke 0.25s ease;
    }
    .hl-shell .part-shell {
      filter: drop-shadow(0 0 5px #0284c7);
      stroke: #0284c7 !important;
      stroke-width: 2.5px !important;
    }
    .hl-claws .part-claws {
      filter: drop-shadow(0 0 4px #0284c7);
      stroke: #0284c7 !important;
      stroke-width: 2.5px !important;
    }
    .hl-tail .part-tail {
      filter: drop-shadow(0 0 4px #0284c7);
      stroke: #0284c7 !important;
      stroke-width: 2.5px !important;
    }

    /* Scale Comparison Strip */
    .scale-strip {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 6px 10px;
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .scale-title {
      font-size: 10px;
      font-weight: 700;
      color: #64748b;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      display: flex;
      justify-content: space-between;
    }
    .bars-container {
      display: flex;
      flex-direction: column;
      gap: 3px;
    }
    .scale-row {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .scale-label {
      width: 70px;
      font-size: 10.5px;
      font-weight: 700;
      color: #334155;
    }
    .bar-track {
      flex: 1;
      height: 12px;
      background: #f1f5f9;
      border-radius: 999px;
      overflow: hidden;
      display: flex;
    }
    .bar-fill {
      height: 100%;
      border-radius: 999px;
      display: flex;
      align-items: center;
      justify-content: flex-end;
      padding-right: 6px;
      font-size: 8.5px;
      font-weight: 800;
      color: #ffffff;
      transition: width 0.4s ease;
    }
    .bar-glyptodon {
      width: 100%;
      background: #786555;
    }
    .bar-armadillo {
      width: 16.6%;
      background: #d97706;
    }
  </style>
</head>
<body>

  
  <div class="header">
    <div class="title">Same Region, Same Body Plan — 6× Size Difference</div>
    <div class="pill-banner">
      <span>💡 Darwin's Mystery:</span> Why do living animals mirror local extinct fossils?
    </div>
  </div>

  
  <div class="trait-bar">
    <button class="trait-btn active" onclick="setHighlight('all')">✦ View All</button>
    <button class="trait-btn" onclick="setHighlight('shell')">🛡️ Bony Armor</button>
    <button class="trait-btn" onclick="setHighlight('claws')">🐾 Heavy Claws</button>
    <button class="trait-btn" onclick="setHighlight('tail')">⚔️ Armored Tail</button>
  </div>

  
  <div class="comparison-grid" id="compGrid">
    
    
    <div class="creature-card fossil">
      <div class="card-header">
        <span class="card-title">Glyptodon</span>
        <span class="card-tag tag-fossil">Extinct Fossil</span>
      </div>

      <div class="svg-wrap">
        <svg viewBox="0 0 240 140" fill="none" xmlns="http://www.w3.org/2000/svg">
          
          <ellipse cx="120" cy="130" rx="90" ry="6" fill="#e2e8f0"/>

          
          <g class="part-tail">
            <path d="M 45 92 Q 20 95 10 85 Q 8 80 18 78 Q 35 80 50 82 Z" fill="#605043" stroke="#4a3b32" stroke-width="1.5"/>
            
            <polygon points="12,81 6,75 14,77" fill="#4a3b32"/>
            <polygon points="24,80 20,72 27,77" fill="#4a3b32"/>
            <polygon points="36,81 33,73 40,79" fill="#4a3b32"/>
            <polygon points="12,86 8,92 16,88" fill="#4a3b32"/>
            <polygon points="24,87 22,94 28,88" fill="#4a3b32"/>
          </g>

          
          <g class="part-claws">
            <rect x="62" y="90" width="22" height="34" rx="6" fill="#4a3b32"/>
            
            <path d="M 62 124 L 58 128 L 64 128 Z" fill="#2d241e"/>
            <path d="M 68 124 L 68 129 L 73 129 Z" fill="#2d241e"/>
            <path d="M 76 124 L 78 128 L 84 128 Z" fill="#2d241e"/>
          </g>

          
          <g class="part-claws">
            <rect x="150" y="92" width="20" height="32" rx="6" fill="#4a3b32"/>
            
            <path d="M 150 124 L 146 128 L 152 128 Z" fill="#2d241e"/>
            <path d="M 156 124 L 156 129 L 161 129 Z" fill="#2d241e"/>
            <path d="M 163 124 L 166 128 L 171 128 Z" fill="#2d241e"/>
          </g>

          
          <g>
            <ellipse cx="188" cy="88" rx="18" ry="14" fill="#605043" stroke="#4a3b32" stroke-width="1.5"/>
            
            <path d="M 198 84 L 210 92 L 198 98 Z" fill="#4a3b32"/>
            
            <circle cx="193" cy="85" r="2.5" fill="#1e2945"/>
            
            <path class="part-shell" d="M 176 80 Q 188 72 200 80 Q 188 76 176 80 Z" fill="#8c7b6d" stroke="#4a3b32" stroke-width="1"/>
          </g>

          
          <g class="part-shell">
            <path d="M 45 92 C 45 35 175 35 178 92 C 178 96 45 96 45 92 Z" fill="#786555" stroke="#4a3b32" stroke-width="2"/>
            
            
            <path d="M 65 70 L 75 62 L 90 64 L 95 74 L 85 82 L 70 80 Z" fill="#8c7b6d" stroke="#5c4d41" stroke-width="1"/>
            <path d="M 95 74 L 105 64 L 120 64 L 125 75 L 115 84 L 100 83 Z" fill="#8c7b6d" stroke="#5c4d41" stroke-width="1"/>
            <path d="M 125 75 L 135 64 L 150 65 L 155 76 L 145 84 L 130 84 Z" fill="#8c7b6d" stroke="#5c4d41" stroke-width="1"/>
            
            <path d="M 80 58 L 92 48 L 107 48 L 112 58 L 102 66 L 88 66 Z" fill="#8c7b6d" stroke="#5c4d41" stroke-width="1"/>
            <path d="M 110 58 L 122 47 L 137 47 L 142 58 L 132 66 L 118 66 Z" fill="#8c7b6d" stroke="#5c4d41" stroke-width="1"/>
            <path d="M 98 44 L 110 36 L 124 36 L 128 44 L 120 48 L 106 48 Z" fill="#9a897b" stroke="#5c4d41" stroke-width="1"/>

            
            <path d="M 46 92 Q 110 97 177 92" stroke="#4a3b32" stroke-width="3" fill="none"/>
          </g>
        </svg>
      </div>

      <div class="badges-row">
        <span class="badge highlight">~3.0 m (10 ft)</span>
        <span class="badge">🚗 Car-sized</span>
        <span class="badge">South America</span>
      </div>
    </div>

    
    <div class="creature-card living">
      <div class="card-header">
        <span class="card-title">Armadillo</span>
        <span class="card-tag tag-living">Living Species</span>
      </div>

      <div class="svg-wrap">
        <svg viewBox="0 0 240 140" fill="none" xmlns="http://www.w3.org/2000/svg">
          
          <ellipse cx="120" cy="130" rx="80" ry="5" fill="#e2e8f0"/>

          
          <g class="part-tail">
            <path d="M 55 96 Q 25 104 15 110 Q 30 98 60 92 Z" fill="#b45309" stroke="#78350f" stroke-width="1.2"/>
            
            <line x1="28" y1="102" x2="32" y2="106" stroke="#78350f" stroke-width="1.5"/>
            <line x1="38" y1="99" x2="43" y2="103" stroke="#78350f" stroke-width="1.5"/>
            <line x1="48" y1="96" x2="53" y2="100" stroke="#78350f" stroke-width="1.5"/>
          </g>

          
          <g class="part-claws">
            <path d="M 72 96 L 68 124 L 78 124 L 84 96 Z" fill="#92400e"/>
            
            <path d="M 66 124 L 62 127 L 69 127 Z" fill="#451a03"/>
            <path d="M 72 124 L 73 128 L 78 128 Z" fill="#451a03"/>
          </g>

          
          <g class="part-claws">
            <path d="M 148 96 L 152 124 L 162 124 L 158 96 Z" fill="#92400e"/>
            
            <path d="M 152 124 L 153 128 L 158 128 Z" fill="#451a03"/>
            <path d="M 160 124 L 165 127 L 167 124 Z" fill="#451a03"/>
          </g>

          
          <g>
            
            <path d="M 160 92 Q 185 86 215 94 Q 185 104 162 100 Z" fill="#b45309" stroke="#78350f" stroke-width="1.2"/>
            
            <path d="M 168 86 L 165 72 L 173 84 Z" fill="#d97706" stroke="#78350f" stroke-width="1"/>
            <path d="M 174 86 L 175 70 L 180 84 Z" fill="#b45309" stroke="#78350f" stroke-width="1"/>
            
            <circle cx="188" cy="90" r="2.2" fill="#1e2945"/>
            
            <path class="part-shell" d="M 172 87 Q 185 82 196 88 Q 185 85 172 87 Z" fill="#f59e0b" stroke="#78350f" stroke-width="1"/>
          </g>

          
          <g class="part-shell">
            
            <path d="M 136 68 C 148 70 162 78 165 98 C 145 99 136 98 136 68 Z" fill="#f59e0b" stroke="#78350f" stroke-width="1.5"/>
            
            
            <rect x="124" y="66" width="10" height="32" rx="2" fill="#d97706" stroke="#78350f" stroke-width="1"/>
            <rect x="112" y="64" width="10" height="34" rx="2" fill="#f59e0b" stroke="#78350f" stroke-width="1"/>
            <rect x="100" y="64" width="10" height="34" rx="2" fill="#d97706" stroke="#78350f" stroke-width="1"/>
            <rect x="88" y="66" width="10" height="32" rx="2" fill="#f59e0b" stroke="#78350f" stroke-width="1"/>

            
            <path d="M 58 96 C 58 75 75 66 88 66 C 88 98 75 98 58 96 Z" fill="#d97706" stroke="#78350f" stroke-width="1.5"/>

            
            <path d="M 58 97 Q 112 101 165 97" stroke="#78350f" stroke-width="2.5" fill="none"/>
          </g>
        </svg>
      </div>

      <div class="badges-row">
        <span class="badge highlight">~0.5 m (1.5 ft)</span>
        <span class="badge">🐱 Cat-sized</span>
        <span class="badge">South America</span>
      </div>
    </div>

  </div>

  
  <div class="scale-strip">
    <div class="scale-title">
      <span>Actual Size Comparison (1 : 6 Ratio)</span>
      <span>Metric Scale</span>
    </div>
    <div class="bars-container">
      <div class="scale-row">
        <span class="scale-label">Glyptodon</span>
        <div class="bar-track">
          <div class="bar-fill bar-glyptodon">3.0 m</div>
        </div>
      </div>
      <div class="scale-row">
        <span class="scale-label">Armadillo</span>
        <div class="bar-track">
          <div class="bar-fill bar-armadillo">0.5 m</div>
        </div>
      </div>
    </div>
  </div>

  <script>
    function setHighlight(trait) {
      const grid = document.getElementById('compGrid');
      const buttons = document.querySelectorAll('.trait-btn');

      // Update button styles
      buttons.forEach(btn => btn.classList.remove('active'));
      event.target.classList.add('active');

      // Reset grid highlight classes
      grid.classList.remove('hl-shell', 'hl-claws', 'hl-tail');

      if (trait !== 'all') {
        grid.classList.add('hl-' + trait);
      }
    }
  </script>
</body>
</html>

Charles Darwin and the Voyage of HMS Beagle

<!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 {
      width: 100%;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: #ffffff;
      padding: 12px;
    }

    .header-bar {
      display: flex;
      justify-content: center;
      gap: 8px;
      margin-bottom: 12px;
    }
    .btn-tab {
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
      color: #1e2945;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 20px;
      cursor: pointer;
      transition: background 0.2s, color 0.2s, border-color 0.2s;
    }
    .btn-tab.active {
      background: #22b7ff;
      color: #ffffff;
      border-color: #22b7ff;
    }

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

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

    .island-card {
      border: 1px solid #e6e6e6;
      border-radius: 12px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      background: #fafbfc;
      transition: opacity 0.3s ease, border-color 0.3s ease;
    }

    .island-card.dimmed {
      opacity: 0.35;
    }
    .island-card.highlighted {
      border-color: #22b7ff;
      box-shadow: 0 0 0 1px #22b7ff;
    }

    .card-header {
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .lush-header {
      background: #eafaf1;
      color: #1b6338;
      border-bottom: 1px solid #d2f0dd;
    }
    .dry-header {
      background: #fef7ec;
      color: #9a5312;
      border-bottom: 1px solid #fae4c3;
    }

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

    .label-badge {
      padding: 6px 10px;
      font-size: 12px;
      font-weight: 600;
      text-align: center;
      background: #ffffff;
      border-top: 1px solid #e6e6e6;
      color: #1e2945;
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <button class="btn-tab active" id="btnBoth" onclick="filterView('both')">Compare Both</button>
    <button class="btn-tab" id="btnLush" onclick="filterView('lush')">Lush Island</button>
    <button class="btn-tab" id="btnDry" onclick="filterView('dry')">Dry Island</button>
  </div>

  <div class="comparison-grid">
    
    <div class="island-card" id="cardLush">
      <div class="card-header lush-header">
        <span>Lush Island</span>
        <span>🌿 Low Plants</span>
      </div>
      <svg class="scene-svg" viewBox="0 0 260 170" aria-label="Dome-shelled tortoise eating low grass">
        
        <rect x="0" y="0" width="260" height="170" fill="#f4fbf7" />
        <rect x="0" y="125" width="260" height="45" fill="#cbebd3" />
        
        
        <path d="M10,125 Q15,110 25,125 Q35,108 45,125" stroke="#48bb78" stroke-width="3" fill="none" />
        <path d="M50,125 Q58,115 65,125 Q75,112 85,125" stroke="#38a169" stroke-width="3" fill="none" />
        <path d="M190,125 Q205,108 220,125 Q235,112 250,125" stroke="#48bb78" stroke-width="3" fill="none" />
        <path d="M30,135 Q40,118 50,135" stroke="#2f855a" stroke-width="2.5" fill="none" />

        
        <ellipse cx="65" cy="126" rx="20" ry="8" fill="#48bb78" opacity="0.25" />

        
        
        <ellipse cx="190" cy="130" rx="10" ry="7" fill="#606f7b" />
        <ellipse cx="140" cy="130" rx="9" ry="7" fill="#606f7b" />

        
        <ellipse cx="160" cy="98" rx="44" ry="34" fill="#715d48" />
        <path d="M116,102 Q160,54 204,102 L204,115 Q160,120 116,115 Z" fill="#584534" />
        
        <circle cx="160" cy="85" r="8" fill="#463628" />
        <circle cx="140" cy="96" r="7" fill="#463628" />
        <circle cx="180" cy="96" r="7" fill="#463628" />

        
        <path d="M125,108 Q100,112 75,124" stroke="#7e8c74" stroke-width="13" stroke-linecap="round" fill="none" />
        
        
        <ellipse cx="68" cy="125" rx="10" ry="7" fill="#7e8c74" transform="rotate(10 68 125)" />
        <circle cx="65" cy="123" r="1.5" fill="#1e2945" />

        
        <ellipse cx="120" cy="130" rx="10" ry="8" fill="#6b7c65" />

        
        <path d="M120,62 L150,72" stroke="#22b7ff" stroke-width="2" stroke-linecap="round" marker-end="url(#arrow)" />
        <rect x="52" y="44" width="102" height="20" rx="4" fill="#ffffff" stroke="#22b7ff" stroke-width="1.5" />
        <text x="103" y="58" font-size="10.5" font-weight="700" fill="#1e2945" text-anchor="middle">Round dome</text>
      </svg>
      <div class="label-badge">Round shell + short neck</div>
    </div>

    
    <div class="island-card" id="cardDry">
      <div class="card-header dry-header">
        <span>Dry Island</span>
        <span>🌵 Tall Cacti</span>
      </div>
      <svg class="scene-svg" viewBox="0 0 260 170" aria-label="Saddleback tortoise reaching up for tall cactus">
        
        <rect x="0" y="0" width="260" height="170" fill="#fdfaf3" />
        <rect x="0" y="125" width="260" height="45" fill="#e8d8be" />
        <circle cx="210" cy="135" r="5" fill="#c4b295" />
        <circle cx="230" cy="140" r="8" fill="#bfa989" />

        
        
        <rect x="35" y="65" width="12" height="65" fill="#6e8557" rx="4" />
        
        <ellipse cx="41" cy="62" rx="14" ry="18" fill="#589e5a" />
        <ellipse cx="25" cy="40" rx="12" ry="15" fill="#4ea152" transform="rotate(-20 25 40)" />
        <ellipse cx="55" cy="38" rx="13" ry="16" fill="#4ea152" transform="rotate(25 55 38)" />
        <ellipse cx="40" cy="18" rx="10" ry="13" fill="#3d8f41" />
        
        <circle cx="58" cy="24" r="3.5" fill="#f6ad55" />
        <circle cx="20" cy="28" r="3" fill="#f6ad55" />

        
        
        <ellipse cx="195" cy="130" rx="10" ry="7" fill="#606f7b" />
        <ellipse cx="150" cy="130" rx="9" ry="7" fill="#606f7b" />

        
        <path d="M120,80 Q145,98 165,85 Q195,85 208,110 L208,118 Q165,122 120,118 Z" fill="#584534" />
        <ellipse cx="170" cy="98" rx="38" ry="24" fill="#715d48" />
        <path d="M120,80 Q138,102 152,108 L120,118 Z" fill="#3d2e22" opacity="0.6" />

        
        <path d="M118,80 Q132,96 136,112" stroke="#22b7ff" stroke-width="2" fill="none" stroke-dasharray="3,2" />

        
        <path d="M132,105 Q115,70 72,42" stroke="#7e8c74" stroke-width="10" stroke-linecap="round" fill="none" />
        
        
        <ellipse cx="64" cy="38" rx="9" ry="6.5" fill="#7e8c74" transform="rotate(-30 64 38)" />
        <circle cx="63" cy="36" r="1.5" fill="#1e2945" />

        
        <ellipse cx="130" cy="128" rx="9" ry="9" fill="#6b7c65" />

        
        <rect x="135" y="44" width="112" height="20" rx="4" fill="#ffffff" stroke="#22b7ff" stroke-width="1.5" />
        <text x="191" y="58" font-size="10.5" font-weight="700" fill="#1e2945" text-anchor="middle">Arched saddle shell</text>
      </svg>
      <div class="label-badge">Curved shell + long neck</div>
    </div>
  </div>

  <script>
    function filterView(mode) {
      const cardLush = document.getElementById('cardLush');
      const cardDry = document.getElementById('cardDry');
      const btnBoth = document.getElementById('btnBoth');
      const btnLush = document.getElementById('btnLush');
      const btnDry = document.getElementById('btnDry');

      btnBoth.classList.remove('active');
      btnLush.classList.remove('active');
      btnDry.classList.remove('active');

      if (mode === 'lush') {
        btnLush.classList.add('active');
        cardLush.classList.remove('dimmed');
        cardLush.classList.add('highlighted');
        cardDry.classList.add('dimmed');
        cardDry.classList.remove('highlighted');
      } else if (mode === 'dry') {
        btnDry.classList.add('active');
        cardDry.classList.remove('dimmed');
        cardDry.classList.add('highlighted');
        cardLush.classList.add('dimmed');
        cardLush.classList.remove('highlighted');
      } else {
        btnBoth.classList.add('active');
        cardLush.classList.remove('dimmed', 'highlighted');
        cardDry.classList.remove('dimmed', 'highlighted');
      }
    }
  </script>
</body>
</html>

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

    .finch-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      width: 100%;
    }

    @media (max-width: 480px) {
      .finch-grid {
        grid-template-columns: 1fr;
        gap: 8px;
      }
    }

    .finch-card {
      background: #ffffff;
      border: 1.5px solid #e6e6e6;
      border-radius: 12px;
      padding: 12px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      gap: 8px;
      transition: border-color 0.25s ease, box-shadow 0.25s ease;
      cursor: pointer;
    }

    @media (max-width: 480px) {
      .finch-card {
        flex-direction: row;
        justify-content: space-between;
        padding: 10px 14px;
        text-align: left;
      }
    }

    .finch-card.active {
      border-color: #22b7ff;
      box-shadow: 0 0 0 2px rgba(34, 183, 255, 0.25);
    }

    .card-title {
      font-size: 14px;
      font-weight: 700;
      line-height: 1.2;
    }

    .visual-row {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      width: 100%;
    }

    @media (max-width: 480px) {
      .visual-row {
        flex-direction: row;
        width: auto;
        gap: 10px;
      }
    }

    .bird-svg {
      width: 80px;
      height: 60px;
    }

    .match-arrow {
      font-size: 16px;
      color: #22b7ff;
      font-weight: bold;
    }

    @media (max-width: 480px) {
      .match-arrow {
        transform: rotate(0deg);
      }
    }

    .food-box {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
    }

    .food-icon {
      font-size: 26px;
      line-height: 1;
    }

    .badge {
      font-size: 11px;
      font-weight: 600;
      background: #f1f5f9;
      color: #475569;
      padding: 3px 8px;
      border-radius: 6px;
      white-space: nowrap;
    }

    .finch-card.active .badge {
      background: #e0f2fe;
      color: #0369a1;
    }

    .tool-hint {
      font-size: 11px;
      color: #64748b;
      font-style: italic;
    }
  </style>
</head>
<body>

  <div class="finch-grid">
    
    <div class="finch-card active" onclick="selectCard(0)">
      <div>
        <div class="card-title">Ground Finch</div>
        <div class="tool-hint">Crushing (pliers)</div>
      </div>
      <div class="visual-row">
        
        <svg class="bird-svg" viewBox="0 0 100 70">
          <circle cx="35" cy="35" r="22" fill="#64748b" />
          <circle cx="30" cy="30" r="3.5" fill="#ffffff" />
          <circle cx="30" cy="30" r="1.8" fill="#1e2945" />
          
          <polygon points="48,20 86,34 48,50" fill="#f59e0b" stroke="#d97706" stroke-width="1.5" />
          <line points="48,34 84,34" stroke="#b45309" stroke-width="1.5" />
        </svg>

        <span class="match-arrow">↓</span>

        <div class="food-box">
          <span class="food-icon">🌰</span>
          <span class="badge">Hard Seeds</span>
        </div>
      </div>
    </div>

    
    <div class="finch-card" onclick="selectCard(1)">
      <div>
        <div class="card-title">Cactus Finch</div>
        <div class="tool-hint">Probing (tweezers)</div>
      </div>
      <div class="visual-row">
        
        <svg class="bird-svg" viewBox="0 0 100 70">
          <circle cx="32" cy="35" r="22" fill="#78716c" />
          <circle cx="28" cy="30" r="3.5" fill="#ffffff" />
          <circle cx="28" cy="30" r="1.8" fill="#1e2945" />
          
          <polygon points="46,26 92,35 46,42" fill="#fbbf24" stroke="#d97706" stroke-width="1.5" />
          <line points="46,35 90,35" stroke="#b45309" stroke-width="1.5" />
        </svg>

        <span class="match-arrow">↓</span>

        <div class="food-box">
          <span class="food-icon">🌵</span>
          <span class="badge">Cactus & Nectar</span>
        </div>
      </div>
    </div>

    
    <div class="finch-card" onclick="selectCard(2)">
      <div>
        <div class="card-title">Warbler Finch</div>
        <div class="tool-hint">Grasping (needle)</div>
      </div>
      <div class="visual-row">
        
        <svg class="bird-svg" viewBox="0 0 100 70">
          <circle cx="32" cy="35" r="22" fill="#65a30d" />
          <circle cx="28" cy="30" r="3.5" fill="#ffffff" />
          <circle cx="28" cy="30" r="1.8" fill="#1e2945" />
          
          <polygon points="46,31 88,35 46,37" fill="#fcd34d" stroke="#d97706" stroke-width="1.5" />
          <line points="46,35 86,35" stroke="#b45309" stroke-width="1.2" />
        </svg>

        <span class="match-arrow">↓</span>

        <div class="food-box">
          <span class="food-icon">🐛</span>
          <span class="badge">Small Insects</span>
        </div>
      </div>
    </div>
  </div>

  <script>
    const cards = document.querySelectorAll('.finch-card');
    let currentIndex = 0;

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

    // Auto-cycle through beaks peacefully
    setInterval(() => {
      currentIndex = (currentIndex + 1) % cards.length;
      selectCard(currentIndex);
    }, 3500);
  </script>
</body>
</html>

science.ks3.y2.t3.s1

Aligned learning resources

Related diagrams