<!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;
      color: #1e2945;
      background: transparent;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      min-height: 100%;
    }

    .controls {
      display: flex;
      gap: 10px;
      margin-bottom: 10px;
      width: 100%;
      max-width: 600px;
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    .btn {
      flex: 1;
      padding: 8px 14px;
      border: 1.5px solid #cbd5e1;
      border-radius: 6px;
      background: #ffffff;
      color: #1e2945;
      font-size: 13px;
      font-weight: 700;
      cursor: pointer;
      text-align: center;
      transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, box-shadow 0.3s ease;
    }

    .btn.active {
      background: #1b4d3e;
      color: #ffffff;
      border-color: #1b4d3e;
      box-shadow: 0 2px 5px rgba(27, 77, 62, 0.25);
    }

    .diagram-stage {
      width: 100%;
      max-width: 600px;
      aspect-ratio: 600 / 320;
      position: relative;
    }

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

    .panel {
      transition: opacity 0.5s ease;
      opacity: 1;
    }

    .panel.hidden {
      display: none;
      opacity: 0;
    }

    /* Slow, smooth flow animation without flicker */
    .flow-line {
      stroke-dasharray: 8 8;
      animation: flowAnim 4s linear infinite;
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    @keyframes flowAnim {
      from { stroke-dashoffset: 64; }
      to { stroke-dashoffset: 0; }
    }

    .legend {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 14px;
      margin-top: 10px;
      font-size: 12px;
      color: #1e2945;
      font-weight: 600;
    }

    .legend-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .swatch {
      width: 14px;
      height: 14px;
      border-radius: 3px;
    }

    .swatch-corridor { background: #2e7d32; }
    .swatch-flow { background: #0284c7; }
    .swatch-blocked { background: #e11d48; }

    @media (max-width: 480px) {
      .btn {
        font-size: 11.5px;
        padding: 6px 8px;
      }
      .legend {
        font-size: 11px;
        gap: 8px;
      }
    }
  </style>
</head>
<body>

  <div class="controls">
    <button id="btnA" class="btn active" onclick="showPanel('A')">A: Intact Agroecosystem</button>
    <button id="btnB" class="btn" onclick="showPanel('B')">B: Intensive Farm</button>
  </div>

  <div class="diagram-stage">
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      <text x="552" y="168" fill="#a7f3d0" font-size="11" text-anchor="middle">Reserve B</text>

      
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        <g transform="translate(300, 15)">
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          <text x="0" y="3" fill="#ffffff" font-size="9.5" font-weight="700" text-anchor="middle">Hedgerow Corridor</text>
        </g>

        
        
        <path d="M 85,160 L 515,160" stroke="#0284c7" stroke-width="3" stroke-linecap="round" fill="none" class="flow-line" />
        
        
        <path d="M 85,160 L 197,160 L 197,12 L 397,12 L 397,160 L 515,160" stroke="#38bdf8" stroke-width="2" stroke-linecap="round" fill="none" class="flow-line" opacity="0.9" />

        
        <path d="M 85,160 L 297,160 L 297,308 L 515,308" stroke="#38bdf8" stroke-width="2" stroke-linecap="round" fill="none" class="flow-line" opacity="0.9" />

        
        <g transform="translate(148, 160)">
          <circle cx="0" cy="0" r="10" fill="#ffffff" opacity="0.9" />
          <text x="0" y="4" font-size="11" text-anchor="middle">🦔</text>
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        <g transform="translate(348, 160)">
          <circle cx="0" cy="0" r="10" fill="#ffffff" opacity="0.9" />
          <text x="0" y="4" font-size="11" text-anchor="middle">🐞</text>
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        <g transform="translate(450, 160)">
          <circle cx="0" cy="0" r="10" fill="#ffffff" opacity="0.9" />
          <text x="0" y="4" font-size="11" text-anchor="middle">🐦</text>
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      </g>

      
      <g id="panelB" class="panel hidden">
        
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        <text x="300" y="157" fill="#854d0e" font-size="11" font-weight="700" text-anchor="middle">Consolidated Giant Field</text>
        <text x="300" y="171" fill="#a16207" font-size="9.5" text-anchor="middle">Hedgerows Removed</text>

        
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        <g transform="translate(47, 85)">
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        <g transform="translate(552, 235)">
          <circle cx="0" cy="0" r="13" fill="#143d31" />
          <text x="0" y="5" font-size="14" text-anchor="middle">🐞</text>
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        <g transform="translate(47, 285)">
          <rect x="-35" y="-9" width="70" height="18" rx="4" fill="#fee2e2" stroke="#fca5a5" stroke-width="1" />
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        </g>
      </g>
    </svg>
  </div>

  
  <div class="legend">
    <div class="legend-item">
      <div class="swatch swatch-corridor"></div>
      <span>Hedgerow Corridor</span>
    </div>
    <div class="legend-item">
      <div class="swatch swatch-flow"></div>
      <span>Dispersal Pathway</span>
    </div>
    <div class="legend-item">
      <div class="swatch swatch-blocked"></div>
      <span>Blocked Dispersal</span>
    </div>
  </div>

  <script>
    function showPanel(panel) {
      const panelA = document.getElementById('panelA');
      const panelB = document.getElementById('panelB');
      const btnA = document.getElementById('btnA');
      const btnB = document.getElementById('btnB');

      if (panel === 'A') {
        panelB.classList.add('hidden');
        panelA.classList.remove('hidden');
        btnA.classList.add('active');
        btnB.classList.remove('active');
      } else {
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        panelB.classList.remove('hidden');
        btnA.classList.remove('active');
        btnB.classList.add('active');
      }
    }
  </script>
</body>
</html>

Agricultural Practices and Their Impact on Species and Habitat Diversity

<!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: #0f172a;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100vh;
      overflow-x: hidden;
    }

    .header-bar {
      width: 100%;
      max-width: 480px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 8px;
      margin-bottom: 6px;
    }

    .badge-group {
      display: flex;
      gap: 6px;
    }

    .pill-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 16px;
      padding: 4px 10px;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: background-color 0.2s, border-color 0.2s, color 0.2s;
      white-space: nowrap;
    }

    .pill-btn.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
      box-shadow: 0 2px 4px rgba(2, 132, 199, 0.25);
    }

    .mag-tag {
      font-size: 11px;
      font-weight: 700;
      color: #c2410c;
      background: #ffffff;
      padding: 3px 8px;
      border-radius: 6px;
      border: 1px solid #fdba74;
      white-space: nowrap;
      text-align: right;
    }

    .pyramid-container {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 350px;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      align-items: center;
      gap: 6px;
      margin: 4px 0;
    }

    .tier {
      position: relative;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 8px;
      cursor: pointer;
      transition: box-shadow 0.2s ease, border-color 0.2s ease;
      border: 1px solid rgba(0, 0, 0, 0.12);
      overflow: hidden;
    }

    .tier:hover {
      box-shadow: 0 0 0 2px #0284c7;
    }

    .tier.highlighted {
      box-shadow: 0 0 0 2px #ea580c;
    }

    /* Tier Widths & Heights calibrated for clear readability */
    .t5 { width: 62%; height: 56px; background: #fee2e2; }
    .t4 { width: 72%; height: 54px; background: #ffedd5; }
    .t3 { width: 82%; height: 54px; background: #fef3c7; }
    .t2 { width: 92%; height: 54px; background: #dcfce7; }
    .t1 { width: 100%; height: 54px; background: #e0f2fe; }

    /* High-contrast badges protecting text from canvas particles */
    .tier-badge {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(4px);
      -webkit-backdrop-filter: blur(4px);
      padding: 3px 7px;
      border-radius: 6px;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
      border: 1px solid rgba(255, 255, 255, 0.8);
      z-index: 3;
    }

    .tier-left {
      z-index: 3;
      font-size: 12px;
      font-weight: 700;
      color: #0f172a;
      white-space: nowrap;
    }

    .tier-left .icon {
      font-size: 16px;
      line-height: 1;
      display: inline-block;
    }

    .tier-right {
      z-index: 3;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .ppm-val {
      font-size: 12px;
      font-weight: 800;
      font-variant-numeric: tabular-nums;
      color: #c2410c;
      white-space: nowrap;
    }

    .t1 .ppm-val { color: #0369a1; }

    .tier-note-icon {
      font-size: 14px;
      line-height: 1;
    }

    /* Orange pesticide dots canvas */
    .dots-canvas {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 1;
    }

    /* Floral spray layer overlay */
    .spray-warning {
      position: absolute;
      bottom: 58px;
      left: 8px;
      right: 8px;
      background: rgba(220, 38, 38, 0.96);
      color: #ffffff;
      padding: 8px 12px;
      border-radius: 8px;
      font-size: 12px;
      font-weight: 700;
      display: none;
      align-items: center;
      justify-content: center;
      text-align: center;
      box-shadow: 0 4px 12px rgba(220, 38, 38, 0.35);
      z-index: 10;
      animation: fadeIn 0.25s ease;
    }

    .spray-active .t2 {
      filter: grayscale(0.85) opacity(0.55);
      border-color: #ef4444;
    }

    .spray-active .t3 {
      opacity: 0.55;
    }

    .spray-active .spray-warning {
      display: flex;
    }

    /* Educational Info Box */
    .info-bar {
      width: 100%;
      max-width: 480px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 6px 10px;
      font-size: 11px;
      color: #475569;
      line-height: 1.35;
      text-align: center;
      margin-top: 4px;
    }

    .info-bar strong {
      color: #0f172a;
    }

    /* Step indicator dots */
    .controls {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      margin-top: 6px;
    }

    .step-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #cbd5e1;
      cursor: pointer;
      transition: background-color 0.2s;
    }

    .step-dot.active {
      background: #0284c7;
      box-shadow: 0 0 0 2px #bae6fd;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(3px); }
      to { opacity: 1; transform: translateY(0); }
    }

    @media (max-width: 380px) {
      .header-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 6px;
      }
      .badge-group {
        justify-content: space-between;
      }
      .pill-btn {
        flex: 1;
        justify-content: center;
        padding: 4px 6px;
        font-size: 11px;
      }
      .mag-tag {
        text-align: center;
      }
      .t5 { width: 78%; }
      .t4 { width: 84%; }
      .t3 { width: 90%; }
      .t2 { width: 96%; }
      .t1 { width: 100%; }
      .tier-badge {
        padding: 2px 5px;
        gap: 3px;
      }
      .tier-left {
        font-size: 11px;
      }
      .ppm-val {
        font-size: 11px;
      }
      .tier-left .icon {
        font-size: 14px;
      }
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <div class="badge-group">
      <button class="pill-btn active" id="btnBiomag" onclick="setMode('biomag')">Biomagnification</button>
      <button class="pill-btn" id="btnHerbicide" onclick="setMode('spray')">Herbicide Spray</button>
    </div>
    <div class="mag-tag" id="factorTag">500,000× Concentrated</div>
  </div>

  <div class="pyramid-container" id="pyramid">
    
    <div class="tier t5" id="tier-4" onclick="selectTier(4)" title="Apex Predator Biomagnification">
      <canvas class="dots-canvas" id="cvs4"></canvas>
      <div class="tier-badge tier-left">
        <span class="icon">🦅</span>
        <span>Apex Raptor</span>
      </div>
      <div class="tier-badge tier-right">
        <span class="ppm-val">25.0 ppm</span>
        <span class="tier-note-icon" title="Eggshell thinning and reproductive failure">🥚💥</span>
      </div>
    </div>

    
    <div class="tier t4" id="tier-3" onclick="selectTier(3)" title="Secondary Consumer">
      <canvas class="dots-canvas" id="cvs3"></canvas>
      <div class="tier-badge tier-left">
        <span class="icon">🐦</span>
        <span>Insectivore Birds</span>
      </div>
      <div class="tier-badge tier-right">
        <span class="ppm-val">2.0 ppm</span>
      </div>
    </div>

    
    <div class="tier t3" id="tier-2" onclick="selectTier(2)" title="Primary Consumer">
      <canvas class="dots-canvas" id="cvs2"></canvas>
      <div class="tier-badge tier-left">
        <span class="icon">🦗</span>
        <span>Herbivore Insects</span>
      </div>
      <div class="tier-badge tier-right">
        <span class="ppm-val">0.5 ppm</span>
      </div>
    </div>

    
    <div class="tier t2" id="tier-1" onclick="selectTier(1)" title="Primary Producers">
      <canvas class="dots-canvas" id="cvs1"></canvas>
      <div class="tier-badge tier-left">
        <span class="icon">🌱</span>
        <span>Primary Producers</span>
      </div>
      <div class="tier-badge tier-right">
        <span class="ppm-val">0.04 ppm</span>
      </div>
    </div>

    
    <div class="tier t1" id="tier-0" onclick="selectTier(0)" title="Abiotic Environment">
      <canvas class="dots-canvas" id="cvs0"></canvas>
      <div class="tier-badge tier-left">
        <span class="icon">💧</span>
        <span>Water &amp; Soil</span>
      </div>
      <div class="tier-badge tier-right">
        <span class="ppm-val">0.00005 ppm</span>
      </div>
    </div>

    
    <div class="spray-warning">
      <span>🥀 Wild Flora Eliminated → Pollinators &amp; Insects Starve</span>
    </div>
  </div>

  <div class="info-bar" id="infoBar">
    <strong>Apex Raptor (25.0 ppm):</strong> Synthetic pesticides bioaccumulate up trophic tiers, causing eggshell thinning and raptor population collapse.
  </div>

  
  <div class="controls">
    <div class="step-dot" onclick="selectTier(0)" title="Water & Soil"></div>
    <div class="step-dot" onclick="selectTier(1)" title="Producers"></div>
    <div class="step-dot" onclick="selectTier(2)" title="Insects"></div>
    <div class="step-dot" onclick="selectTier(3)" title="Birds"></div>
    <div class="step-dot active" onclick="selectTier(4)" title="Apex Raptor"></div>
  </div>

  <script>
    const tierDescriptions = [
      "<strong>Water & Soil (0.00005 ppm):</strong> Trace synthetic pesticide runoff enters the abiotic base of the ecosystem.",
      "<strong>Primary Producers (0.04 ppm):</strong> Plants absorb chemical residues directly from soil and water (800× initial concentration).",
      "<strong>Herbivore Insects (0.5 ppm):</strong> Insects consume large plant volumes, accumulating persistent pesticide in lipid tissue.",
      "<strong>Insectivore Birds (2.0 ppm):</strong> Small birds ingest thousands of contaminated insects, further multiplying toxicity.",
      "<strong>Apex Raptor (25.0 ppm):</strong> 500,000× magnification leads to fragile eggshell thinning and reproductive failure."
    ];

    const dotConfigs = [
      { count: 6, size: 2.5, color: 'rgba(2, 132, 199, 0.65)' },    // Tier 0: 0.00005 ppm
      { count: 24, size: 2.5, color: 'rgba(234, 88, 12, 0.7)' },     // Tier 1: 0.04 ppm
      { count: 55, size: 3, color: 'rgba(234, 88, 12, 0.85)' },      // Tier 2: 0.5 ppm
      { count: 110, size: 3.5, color: 'rgba(220, 38, 38, 0.9)' },    // Tier 3: 2.0 ppm
      { count: 200, size: 4, color: 'rgba(194, 65, 12, 1.0)' }       // Tier 4: 25.0 ppm
    ];

    let currentTier = 4;
    let mode = 'biomag';

    function drawDots() {
      for (let i = 0; i < 5; i++) {
        const canvas = document.getElementById(`cvs${i}`);
        if (!canvas) continue;
        const rect = canvas.getBoundingClientRect();
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        canvas.width = rect.width * dpr;
        canvas.height = rect.height * dpr;
        const ctx = canvas.getContext('2d');
        ctx.clearRect(0, 0, canvas.width, canvas.height);

        const cfg = dotConfigs[i];
        ctx.fillStyle = cfg.color;

        // Pseudorandom deterministic seed per tier
        let seed = (i + 1) * 7919;
        function rnd() {
          seed = (seed * 9301 + 49297) % 233280;
          return seed / 233280;
        }

        for (let d = 0; d < cfg.count; d++) {
          const x = rnd() * canvas.width;
          const y = rnd() * canvas.height;
          ctx.beginPath();
          ctx.arc(x, y, cfg.size * dpr, 0, Math.PI * 2);
          ctx.fill();
        }
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    }

    function selectTier(idx) {
      currentTier = idx;
      document.querySelectorAll('.tier').forEach((t, i) => {
        t.classList.toggle('highlighted', i === idx);
      });
      document.querySelectorAll('.step-dot').forEach((d, i) => {
        d.classList.toggle('active', i === idx);
      });
      if (mode === 'biomag') {
        document.getElementById('infoBar').innerHTML = tierDescriptions[idx];
      }
    }

    function setMode(m) {
      mode = m;
      const pyramid = document.getElementById('pyramid');
      const btnB = document.getElementById('btnBiomag');
      const btnH = document.getElementById('btnHerbicide');
      const tag = document.getElementById('factorTag');
      const info = document.getElementById('infoBar');

      if (m === 'spray') {
        pyramid.classList.add('spray-active');
        btnH.classList.add('active');
        btnB.classList.remove('active');
        tag.textContent = 'Floral Bank Loss';
        tag.style.borderColor = '#ef4444';
        tag.style.color = '#dc2626';
        info.innerHTML = '<strong>Herbicide Impact:</strong> Non-target wild floral destruction collapses pollinator foraging, halting insect biomass support for upper tiers.';
      } else {
        pyramid.classList.remove('spray-active');
        btnB.classList.add('active');
        btnH.classList.remove('active');
        tag.textContent = '500,000× Concentrated';
        tag.style.borderColor = '#fdba74';
        tag.style.color = '#c2410c';
        info.innerHTML = tierDescriptions[currentTier];
      }
    }

    window.addEventListener('resize', drawDots);
    window.addEventListener('load', () => {
      drawDots();
      selectTier(4);
    });
  </script>
</body>
</html>

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</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Simpson's Diversity Index Calculation</title>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
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      gap: 10px;
    }

    /* Controls Bar */
    .controls {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
    }

    .step-tabs {
      display: flex;
      gap: 6px;
      flex: 1;
    }

    .step-btn {
      flex: 1;
      padding: 7px 8px;
      font-size: 12px;
      font-weight: 600;
      background: #f1f5f9;
      color: #475569;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
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      transition: background 0.2s, color 0.2s, border-color 0.2s;
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      display: flex;
      align-items: center;
      gap: 4px;
      white-space: nowrap;
    }

    .play-btn:hover {
      background: #f8fafc;
    }

    /* Comparison Grid */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
    }

    @media (max-width: 520px) {
      .comparison-grid {
        grid-template-columns: 1fr;
      }
      .step-btn {
        font-size: 11px;
        padding: 6px 4px;
      }
    }

    .hab-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 10px 12px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
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    .hab-header {
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      font-size: 13.5px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 5px;
    }

    .hab-badge {
      font-size: 11px;
      font-weight: 600;
      padding: 2px 7px;
      border-radius: 12px;
      white-space: nowrap;
    }

    .badge-meadow { background: #dcfce7; color: #166534; }
    .badge-wheat { background: #fef3c7; color: #92400e; }

    /* Visual Distribution Bar */
    .species-bar {
      display: flex;
      height: 12px;
      border-radius: 4px;
      overflow: hidden;
      background: #e2e8f0;
    }

    .species-seg {
      height: 100%;
    }

    .c-0 { background: #22c55e; }
    .c-1 { background: #3b82f6; }
    .c-2 { background: #a855f7; }
    .c-3 { background: #f97316; }
    .c-4 { background: #ec4899; }
    .c-wheat { background: #eab308; }

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    }

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    }

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      font-weight: 700;
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      color: #15803d;
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    .res-low {
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      border: 1px solid #fed7aa;
      color: #c2410c;
    }
  </style>
</head>
<body>

  <div class="controls">
    <div class="step-tabs">
      <button class="step-btn active" id="tab0" type="button">Step 1: ∑n(n−1)</button>
      <button class="step-btn" id="tab1" type="button">Step 2: N(N−1)</button>
      <button class="step-btn" id="tab2" type="button">Step 3: Index D</button>
    </div>
    <button class="play-btn" id="playBtn" type="button"><span id="playIcon">⏸</span> Auto</button>
  </div>

  <div class="comparison-grid">
    
    <div class="hab-card">
      <div class="hab-header">
        <div class="hab-title">🌸 Traditional Meadow</div>
        <span class="hab-badge badge-meadow">Balanced (N=100)</span>
      </div>

      <div>
        <div class="species-bar" title="5 species, 20 each">
          <div class="species-seg c-0" style="width: 20%;"></div>
          <div class="species-seg c-1" style="width: 20%;"></div>
          <div class="species-seg c-2" style="width: 20%;"></div>
          <div class="species-seg c-3" style="width: 20%;"></div>
          <div class="species-seg c-4" style="width: 20%;"></div>
        </div>
        <div class="species-legend">
          <span>5 species</span>
          <span>n = 20 each</span>
        </div>
      </div>

      <div class="calc-steps">
        <div class="calc-box active-box" id="m-box0">
          <div class="calc-label">Step 1: Numerator ∑n(n−1)</div>
          <div class="calc-math" id="m-math0">5 × (20 × 19) = 1900</div>
        </div>

        <div class="calc-box" id="m-box1">
          <div class="calc-label">Step 2: Denominator N(N−1)</div>
          <div class="calc-math" id="m-math1">100 × 99 = 9900</div>
        </div>

        <div class="calc-box" id="m-box2">
          <div class="calc-label">Step 3: Diversity Index D</div>
          <div class="calc-math" id="m-math2">1 − (1900 / 9900) = 1 − 0.192 = 0.808</div>
        </div>
      </div>

      <div class="result-row res-high" id="m-res" style="opacity: 0.4;">
        <span>Diversity Level</span>
        <span>D = 0.808 (High)</span>
      </div>
    </div>

    
    <div class="hab-card">
      <div class="hab-header">
        <div class="hab-title">🌾 Wheat Field</div>
        <span class="hab-badge badge-wheat">Monoculture (N=100)</span>
      </div>

      <div>
        <div class="species-bar" title="Wheat 96%, 4 weeds 1% each">
          <div class="species-seg c-wheat" style="width: 96%;"></div>
          <div class="species-seg c-0" style="width: 1%;"></div>
          <div class="species-seg c-1" style="width: 1%;"></div>
          <div class="species-seg c-2" style="width: 1%;"></div>
          <div class="species-seg c-3" style="width: 1%;"></div>
        </div>
        <div class="species-legend">
          <span>Wheat n=96</span>
          <span>4 weeds n=1</span>
        </div>
      </div>

      <div class="calc-steps">
        <div class="calc-box active-box" id="w-box0">
          <div class="calc-label">Step 1: Numerator ∑n(n−1)</div>
          <div class="calc-math" id="w-math0">96(95) + 4(1 × 0) = 9120</div>
        </div>

        <div class="calc-box" id="w-box1">
          <div class="calc-label">Step 2: Denominator N(N−1)</div>
          <div class="calc-math" id="w-math1">100 × 99 = 9900</div>
        </div>

        <div class="calc-box" id="w-box2">
          <div class="calc-label">Step 3: Diversity Index D</div>
          <div class="calc-math" id="w-math2">1 − (9120 / 9900) = 1 − 0.921 = 0.079</div>
        </div>
      </div>

      <div class="result-row res-low" id="w-res" style="opacity: 0.4;">
        <span>Diversity Level</span>
        <span>D = 0.079 (Low)</span>
      </div>
    </div>
  </div>

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      } else {
        startAuto();
      }
    });

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

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Natural Mosaic vs Agroecosystem</title>
  <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;
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100%;
      min-height: 100%;
      padding: 6px 8px;
    }

    .header-tabs {
      display: flex;
      gap: 8px;
      margin-bottom: 8px;
      width: 100%;
      max-width: 660px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .tab-btn {
      background: #f1f5f9;
      border: 1.5px solid #cbd5e1;
      border-radius: 18px;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      cursor: pointer;
      transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    }

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

    .tab-btn.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
    }

    .panels-container {
      display: flex;
      flex-direction: row;
      gap: 10px;
      width: 100%;
      max-width: 660px;
      justify-content: center;
    }

    .panel {
      flex: 1;
      min-width: 0;
      display: flex;
      flex-direction: column;
    }

    .panel-svg {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 8px;
      border: 1px solid #cbd5e1;
      box-sizing: border-box;
    }

    /* Stack on mobile viewports (< 500px) */
    @media (max-width: 499px) {
      body {
        padding: 4px;
      }
      .panels-container {
        flex-direction: column;
        gap: 8px;
      }
      .tab-btn {
        padding: 5px 10px;
        font-size: 12px;
      }
    }

    /* Interactivity transitions */
    .tier-marker, .root-highlight, .subsoil-label {
      transition: opacity 0.25s ease;
    }
  </style>
</head>
<body>

  <div class="header-tabs" role="tablist" aria-label="Ecosystem Views">
    <button class="tab-btn active" id="btn-all" onclick="setView('all')">Architecture</button>
    <button class="tab-btn" id="btn-tiers" onclick="setView('tiers')">Vertical Tiers</button>
    <button class="tab-btn" id="btn-roots" onclick="setView('roots')">Root Systems</button>
  </div>

  <div class="panels-container">
    
    <div class="panel">
      <svg class="panel-svg" viewBox="0 0 330 350" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <linearGradient id="skyNat" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="#e0f2fe" />
            <stop offset="100%" stop-color="#ffffff" />
          </linearGradient>
          <linearGradient id="soilNat" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="#3d2617" />
            <stop offset="30%" stop-color="#543825" />
            <stop offset="100%" stop-color="#785338" />
          </linearGradient>
        </defs>

        
        <rect x="0" y="0" width="330" height="350" fill="url(#skyNat)" />
        <rect x="0" y="195" width="330" height="155" fill="url(#soilNat)" />

        
        <g transform="translate(8, 8)">
          <rect width="314" height="24" rx="12" fill="#dcfce7" stroke="#15803d" stroke-width="1.2" />
          <text x="157" y="16.5" font-size="11.5" font-weight="800" fill="#14532d" text-anchor="middle">High Structural Diversity • 6 Tiers</text>
        </g>

        
        
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        <path d="M 260 195 Q 290 197 330 195" stroke="#0284c7" stroke-width="2" fill="none" />
        <text x="295" y="209" font-size="8" font-weight="700" fill="#0369a1" text-anchor="middle">Stream</text>

        
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        <ellipse cx="160" cy="135" rx="18" ry="14" fill="#52b788" />

        
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        <rect x="0" y="195" width="260" height="7" fill="#27180e" />
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        <circle cx="38" cy="196" r="2" fill="#d97706" />
        <circle cx="140" cy="196" r="2.5" fill="#b45309" />

        
        <g id="nat-roots" stroke="#d79a61" stroke-linecap="round" fill="none">
          
          <path d="M 74 195 Q 74 250 76 315" stroke-width="4.5" />
          <path d="M 74 220 Q 102 255 120 295" stroke-width="2.8" />
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          <path d="M 175 195 Q 176 215 174 230" stroke-width="1.5" stroke="#a86e3d" />
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        <g id="nat-roots-tag" opacity="0" class="root-highlight" transform="translate(14, 275)">
          <rect width="145" height="38" rx="4" fill="#0f172a" opacity="0.9" />
          <text x="72" y="16" font-size="10.5" font-weight="700" fill="#4ade80" text-anchor="middle">Deep Multi-Tier Roots</text>
          <text x="72" y="30" font-size="9.5" font-weight="500" fill="#f8fafc" text-anchor="middle">Variable depths prevent erosion</text>
        </g>

        
        <g id="nat-tiers-overlay" class="tier-marker" opacity="0">
          <line x1="104" y1="72" x2="230" y2="72" stroke="#0f172a" stroke-width="1.2" stroke-dasharray="3 2" />
          <line x1="172" y1="128" x2="230" y2="128" stroke="#0f172a" stroke-width="1.2" stroke-dasharray="3 2" />
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          <g transform="translate(230, 63)"><rect width="92" height="18" rx="3" fill="#14532d"/><text x="46" y="13" font-size="10" font-weight="700" fill="#ffffff" text-anchor="middle">1. Canopy</text></g>
          <g transform="translate(230, 119)"><rect width="92" height="18" rx="3" fill="#14532d"/><text x="46" y="13" font-size="10" font-weight="700" fill="#ffffff" text-anchor="middle">2. Understory</text></g>
          <g transform="translate(230, 159)"><rect width="92" height="18" rx="3" fill="#14532d"/><text x="46" y="13" font-size="10" font-weight="700" fill="#ffffff" text-anchor="middle">3. Shrub Layer</text></g>
          <g transform="translate(230, 175)"><rect width="92" height="18" rx="3" fill="#14532d"/><text x="46" y="13" font-size="10" font-weight="700" fill="#ffffff" text-anchor="middle">4. Herb Layer</text></g>
          <g transform="translate(230, 195)"><rect width="92" height="18" rx="3" fill="#1e293b"/><text x="46" y="13" font-size="10" font-weight="700" fill="#ffffff" text-anchor="middle">5. Leaf Litter</text></g>
          <g transform="translate(230, 290)"><rect width="92" height="18" rx="3" fill="#1e293b"/><text x="46" y="13" font-size="10" font-weight="700" fill="#ffffff" text-anchor="middle">6. Deep Roots</text></g>
        </g>

        
        <g transform="translate(8, 324)">
          <rect width="314" height="20" rx="4" fill="#ffffff" opacity="0.95" />
          <text x="157" y="14" font-size="10.5" font-weight="700" fill="#14532d" text-anchor="middle">Natural Mosaic • Multiple Microclimates</text>
        </g>
      </svg>
    </div>

    
    <div class="panel">
      <svg class="panel-svg" viewBox="0 0 330 350" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <linearGradient id="skyAgro" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="#fef3c7" />
            <stop offset="100%" stop-color="#ffffff" />
          </linearGradient>
          <linearGradient id="soilAgro" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="#8c6a4e" />
            <stop offset="30%" stop-color="#ad8b70" />
            <stop offset="100%" stop-color="#cbb5a1" />
          </linearGradient>
        </defs>

        
        <rect x="0" y="0" width="330" height="350" fill="url(#skyAgro)" />
        <rect x="0" y="195" width="330" height="155" fill="url(#soilAgro)" />

        
        <g transform="translate(8, 8)">
          <rect width="314" height="24" rx="12" fill="#fef3c7" stroke="#b45309" stroke-width="1.2" />
          <text x="157" y="16.5" font-size="11.5" font-weight="800" fill="#78350f" text-anchor="middle">Low Structural Diversity • 1 Single Tier</text>
        </g>

        
        
        <g stroke="#b45309" stroke-width="2.5" stroke-linecap="round">
          <line x1="18" y1="195" x2="18" y2="148" />
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          <line x1="238" y1="195" x2="238" y2="148" />
        </g>

        
        <g fill="#d97706">
          <ellipse cx="18" cy="144" rx="3.5" ry="8" />
          <ellipse cx="38" cy="144" rx="3.5" ry="8" />
          <ellipse cx="58" cy="144" rx="3.5" ry="8" />
          <ellipse cx="78" cy="144" rx="3.5" ry="8" />
          <ellipse cx="98" cy="144" rx="3.5" ry="8" />
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          <ellipse cx="238" cy="144" rx="3.5" ry="8" />
        </g>

        
        <line x1="0" y1="195" x2="260" y2="195" stroke="#543825" stroke-width="2.5" />

        
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        <text x="295" y="209" font-size="8" font-weight="700" fill="#0f172a" text-anchor="middle">Bare Ditch</text>

        
        <g id="agro-roots" stroke="#6d4c33" stroke-width="1.8" stroke-linecap="round">
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        <rect x="8" y="234" width="248" height="78" fill="#475569" opacity="0.18" stroke="#334155" stroke-width="1.2" stroke-dasharray="4 3" rx="4" />
        
        
        <g transform="translate(32, 260)">
          <rect width="200" height="30" rx="6" fill="#ffffff" stroke="#64748b" stroke-width="1.2" opacity="0.95" />
          <text x="100" y="14" font-size="10" font-weight="800" fill="#1e293b" text-anchor="middle">Compacted Subsoil (Plow Pan)</text>
          <text x="100" y="25" font-size="8.5" font-weight="600" fill="#475569" text-anchor="middle">Limits root depth & water drainage</text>
        </g>

        
        <g id="agro-tiers-overlay" class="tier-marker" opacity="0">
          <line x1="8" y1="142" x2="245" y2="142" stroke="#78350f" stroke-width="1.5" stroke-dasharray="3 2" />
          <line x1="8" y1="195" x2="245" y2="195" stroke="#78350f" stroke-width="1.5" stroke-dasharray="3 2" />
          <g transform="translate(70, 88)">
            <rect width="120" height="24" rx="4" fill="#78350f" />
            <text x="60" y="16" font-size="11" font-weight="700" fill="#ffffff" text-anchor="middle">1 Single Uniform Tier</text>
          </g>
        </g>

        
        <g transform="translate(8, 324)">
          <rect width="314" height="20" rx="4" fill="#ffffff" opacity="0.95" />
          <text x="157" y="14" font-size="10.5" font-weight="700" fill="#78350f" text-anchor="middle">Monoculture • Uniform Niche Vulnerability</text>
        </g>
      </svg>
    </div>
  </div>

  <script>
    function setView(view) {
      document.querySelectorAll('.tab-btn').forEach(btn => btn.classList.remove('active'));
      const natTiers = document.getElementById('nat-tiers-overlay');
      const agroTiers = document.getElementById('agro-tiers-overlay');
      const natRoots = document.getElementById('nat-roots');
      const agroRoots = document.getElementById('agro-roots');
      const natRootsTag = document.getElementById('nat-roots-tag');

      if (view === 'all') {
        document.getElementById('btn-all').classList.add('active');
        natTiers.style.opacity = '0';
        agroTiers.style.opacity = '0';
        natRoots.style.opacity = '1';
        agroRoots.style.opacity = '1';
        natRootsTag.style.opacity = '0';
      } else if (view === 'tiers') {
        document.getElementById('btn-tiers').classList.add('active');
        natTiers.style.opacity = '1';
        agroTiers.style.opacity = '1';
        natRoots.style.opacity = '0.4';
        agroRoots.style.opacity = '0.4';
        natRootsTag.style.opacity = '0';
      } else if (view === 'roots') {
        document.getElementById('btn-roots').classList.add('active');
        natTiers.style.opacity = '0';
        agroTiers.style.opacity = '0';
        natRoots.style.opacity = '1';
        agroRoots.style.opacity = '1';
        natRootsTag.style.opacity = '1';
      }
    }
  </script>
</body>
</html>

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

    body {
      background: transparent;
      color: #1e2945;
      padding: 8px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      user-select: none;
    }

    /* Controls */
    .nav-bar {
      display: flex;
      justify-content: center;
      gap: 4px;
      flex-wrap: wrap;
    }

    .tab-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 16px;
      padding: 4px 10px;
      font-size: 12px;
      font-weight: 600;
      color: #1e2945;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .tab-btn.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
    }

    /* Lanes */
    .lane {
      border-radius: 12px;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      gap: 6px;
      transition: opacity 0.3s ease, transform 0.3s ease;
    }

    .lane-polyculture {
      background: #f0fdf4;
      border: 1px solid #bbf7d0;
    }

    .lane-monoculture {
      background: #fef2f2;
      border: 1px solid #fecaca;
    }

    .lane-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 4px;
    }

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

    .badge-status {
      font-size: 10px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 10px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .badge-stable {
      background: #dcfce7;
      color: #15803d;
    }

    .badge-collapse {
      background: #fee2e2;
      color: #b91c1c;
    }

    /* Flow Grid */
    .flow-row {
      display: grid;
      grid-template-columns: 1fr 24px 1fr 24px 1fr 24px 1fr;
      align-items: center;
    }

    .node {
      background: #ffffff;
      border-radius: 8px;
      padding: 8px 4px;
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 3px;
      min-height: 70px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.06);
      border: 1px solid #e2e8f0;
      transition: all 0.25s ease;
    }

    .lane-polyculture .node {
      border-color: #86efac;
    }

    .lane-monoculture .node {
      border-color: #fca5a5;
    }

    .node.dimmed {
      opacity: 0.25;
      filter: grayscale(0.8);
    }

    .node.highlighted {
      box-shadow: 0 0 0 2px #1e2945;
      transform: translateY(-2px);
    }

    .node-icons {
      font-size: 17px;
      line-height: 1.2;
      display: flex;
      gap: 2px;
      justify-content: center;
      align-items: center;
    }

    .node-label {
      font-size: 11px;
      font-weight: 700;
      color: #1e2945;
      line-height: 1.1;
    }

    .node-sub {
      font-size: 9px;
      font-weight: 500;
      color: #64748b;
    }

    /* Connectors */
    .connector {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      color: #15803d;
      font-weight: bold;
    }

    .connector-web {
      color: #16a34a;
      line-height: 1;
      animation: pulseWeb 2.5s infinite ease-in-out;
    }

    .connector-broken {
      color: #dc2626;
      font-size: 15px;
      font-weight: 900;
      line-height: 1;
    }

    .extinct-node {
      background: #f8fafc;
      border-style: dashed !important;
      border-color: #cbd5e1 !important;
    }

    .extinct-node .node-label {
      color: #94a3b8;
      text-decoration: line-through;
    }

    @keyframes pulseWeb {
      0%, 100% { opacity: 0.6; }
      50% { opacity: 1; }
    }
  </style>
</head>
<body>

  <div class="nav-bar">
    <button class="tab-btn active" onclick="setStep('all')">Full Web</button>
    <button class="tab-btn" onclick="setStep(0)">1. Producers</button>
    <button class="tab-btn" onclick="setStep(1)">2. Herbivores</button>
    <button class="tab-btn" onclick="setStep(2)">3. Predators</button>
    <button class="tab-btn" onclick="setStep(3)">4. Apex</button>
  </div>

  
  <div class="lane lane-polyculture" id="polyLane">
    <div class="lane-header">
      <span class="lane-title">🌿 Polyculture</span>
      <span class="badge-status badge-stable">Resilient Web</span>
    </div>
    <div class="flow-row">
      <div class="node step-0">
        <div class="node-icons">🌿🌸🌾</div>
        <div class="node-label">50+ Plants</div>
      </div>
      <div class="connector connector-web">⇉</div>
      <div class="node step-1">
        <div class="node-icons">🐛🦋🐝</div>
        <div class="node-label">Diverse Herbivores</div>
      </div>
      <div class="connector connector-web">⇉</div>
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        <div class="node-icons">🕷️🐞🪲</div>
        <div class="node-label">Predators</div>
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        <div class="node-icons">🌽</div>
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        <div class="node-icons">🪲🪲🪲</div>
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        <div class="node-icons">🚫🕷️</div>
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      <div class="node step-3 extinct-node">
        <div class="node-icons">💀🦅</div>
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BIO-1.3

Aligned learning resources

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