<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Causes of Infertility: Fallopian Tube Blockage</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: #ffffff;
      color: #1e293b;
      padding: 12px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 680px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
    }

    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      width: 100%;
    }

    .panel {
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 4px 0;
    }

    .header-tag {
      font-size: 14px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 8px;
      letter-spacing: -0.01em;
    }

    .tag-healthy {
      color: #15803d;
    }

    .tag-blocked {
      color: #b91c1c;
    }

    .svg-container {
      width: 100%;
      height: auto;
      max-height: 240px;
      display: block;
    }

    .status-badge {
      margin-top: 10px;
      font-size: 12.5px;
      font-weight: 700;
      padding: 6px 14px;
      border-radius: 9999px;
      text-align: center;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      line-height: 1.2;
    }

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

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

    /* SVG animations and timing */
    @keyframes healthySpermFlow {
      0% {
        offset-distance: 0%;
        opacity: 0;
      }
      10% {
        opacity: 1;
      }
      60%, 85% {
        offset-distance: 62%;
        opacity: 1;
      }
      95%, 100% {
        offset-distance: 62%;
        opacity: 0;
      }
    }

    @keyframes healthyEggFlow {
      0% {
        offset-distance: 100%;
        opacity: 0;
      }
      10% {
        opacity: 1;
      }
      60%, 85% {
        offset-distance: 62%;
        opacity: 1;
      }
      95%, 100% {
        offset-distance: 62%;
        opacity: 0;
      }
    }

    @keyframes blockedSpermFlow {
      0% {
        offset-distance: 0%;
        opacity: 0;
      }
      10% {
        opacity: 1;
      }
      50%, 85% {
        offset-distance: 40%;
        opacity: 1;
      }
      95%, 100% {
        offset-distance: 40%;
        opacity: 0;
      }
    }

    @keyframes blockedEggFlow {
      0% {
        offset-distance: 100%;
        opacity: 0;
      }
      10% {
        opacity: 1;
      }
      50%, 85% {
        offset-distance: 74%;
        opacity: 1;
      }
      95%, 100% {
        offset-distance: 74%;
        opacity: 0;
      }
    }

    @keyframes pulseFertilization {
      0%, 55% {
        opacity: 0;
        transform: scale(0.6);
      }
      65%, 85% {
        opacity: 1;
        transform: scale(1.1);
      }
      95%, 100% {
        opacity: 0;
        transform: scale(0.9);
      }
    }

    @keyframes pulseAdhesion {
      0%, 100% {
        transform: scale(1);
      }
      50% {
        transform: scale(1.08);
      }
    }

    .anim-healthy-sperm {
      offset-path: path("M 35 155 C 50 120 70 95 100 77 C 135 65 175 64 208 72 C 222 76 233 86 238 98");
      animation: healthySpermFlow 5.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    }

    .anim-healthy-egg {
      offset-path: path("M 35 155 C 50 120 70 95 100 77 C 135 65 175 64 208 72 C 222 76 233 86 238 98");
      animation: healthyEggFlow 5.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    }

    .anim-blocked-sperm {
      offset-path: path("M 35 155 C 50 120 70 95 100 77 C 135 65 175 64 208 72 C 222 76 233 86 238 98");
      animation: blockedSpermFlow 5.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    }

    .anim-blocked-egg {
      offset-path: path("M 35 155 C 50 120 70 95 100 77 C 135 65 175 64 208 72 C 222 76 233 86 238 98");
      animation: blockedEggFlow 5.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    }

    .anim-sparkle {
      transform-origin: 142px 66px;
      animation: pulseFertilization 5.2s ease-in-out infinite;
    }

    .anim-adhesions {
      transform-origin: 130px 68px;
      animation: pulseAdhesion 2.6s ease-in-out infinite;
    }

    @media (max-width: 500px) {
      .comparison-grid {
        grid-template-columns: 1fr;
        gap: 20px;
      }
      .panel {
        max-width: 320px;
        margin: 0 auto;
      }
    }
  </style>
</head>
<body>

  <div class="container">
    <div class="comparison-grid">
      
      <div class="panel">
        <div class="header-tag tag-healthy">
          <svg width="18" height="18" viewBox="0 0 20 20" fill="none">
            <circle cx="10" cy="10" r="9" fill="#dcfce7" stroke="#16a34a" stroke-width="1.8"/>
            <path d="M6 10.2 L8.8 13 L14 7.5" stroke="#16a34a" stroke-width="2.2" stroke-linecap="round" stroke-linejoin="round"/>
          </svg>
          <span>Healthy Open Pathway</span>
        </div>

        <svg class="svg-container" viewBox="0 0 260 190" aria-label="Diagram showing healthy fallopian tube with open pathway for sperm and egg">
          <defs>
            <radialGradient id="eggGradHealthy" cx="40%" cy="40%" r="60%">
              <stop offset="0%" stop-color="#fdba74"/>
              <stop offset="60%" stop-color="#ea580c"/>
              <stop offset="100%" stop-color="#c2410c"/>
            </radialGradient>
          </defs>

          
          <path d="M 20 180 C 40 140 50 110 70 95 C 100 75 160 60 205 70 C 220 73 235 85 240 100" 
                fill="none" stroke="#fbcfe8" stroke-width="26" stroke-linecap="round"/>
          
          
          <path d="M 20 180 C 40 140 50 110 70 95 C 100 75 160 60 205 70 C 220 73 235 85 240 100" 
                fill="none" stroke="#f8fafc" stroke-width="13" stroke-linecap="round"/>

          
          <path d="M 235 88 C 248 85 252 95 245 102 C 254 105 248 116 238 112 C 244 120 234 125 228 115" 
                fill="none" stroke="#f472b6" stroke-width="3.2" stroke-linecap="round"/>

          
          <ellipse cx="215" cy="135" rx="22" ry="16" fill="#fdf2f8" stroke="#f472b6" stroke-width="2"/>
          <text x="215" y="139" font-size="10.5" font-weight="700" fill="#be185d" text-anchor="middle">Ovary</text>

          
          <path d="M 35 155 C 50 120 70 95 100 77 C 135 65 175 64 208 72 C 222 76 233 86 238 98" 
                fill="none" stroke="#86efac" stroke-width="2" stroke-dasharray="3.5 3.5"/>

          
          <text x="46" y="168" font-size="10.5" font-weight="700" fill="#2563eb" text-anchor="start">Sperm</text>
          <text x="225" y="58" font-size="10.5" font-weight="700" fill="#ea580c" text-anchor="middle">Egg (Ovum)</text>
          <text x="26" y="186" font-size="9.5" font-weight="600" fill="#94a3b8" text-anchor="start">Uterus</text>

          
          <g class="anim-healthy-egg">
            <circle cx="0" cy="0" r="6" fill="url(#eggGradHealthy)" stroke="#ffffff" stroke-width="1.2"/>
            <circle cx="-1.5" cy="-1.5" r="1.8" fill="#fef08a"/>
          </g>

          
          <g class="anim-healthy-sperm">
            
            <ellipse cx="0" cy="0" rx="4.2" ry="2.6" fill="#2563eb"/>
            <path d="M -4 0 Q -8 -2.5 -12 0" fill="none" stroke="#2563eb" stroke-width="1.4" stroke-linecap="round"/>
          </g>

          
          <g class="anim-sparkle">
            <circle cx="142" cy="66" r="15" fill="#22c55e" fill-opacity="0.22"/>
            <circle cx="142" cy="66" r="7.5" fill="#16a34a"/>
            <text x="142" y="70" font-size="10" font-weight="bold" fill="#ffffff" text-anchor="middle">✓</text>
            <text x="142" y="47" font-size="9.5" font-weight="700" fill="#15803d" text-anchor="middle">Fertilization</text>
          </g>
        </svg>

        <div class="status-badge badge-healthy">
          <span>✓</span> Fertilization Pathway Open
        </div>
      </div>

      
      <div class="panel">
        <div class="header-tag tag-blocked">
          <svg width="18" height="18" viewBox="0 0 20 20" fill="none">
            <circle cx="10" cy="10" r="9" fill="#fee2e2" stroke="#dc2626" stroke-width="1.8"/>
            <path d="M7 7 L13 13 M13 7 L7 13" stroke="#dc2626" stroke-width="2.2" stroke-linecap="round"/>
          </svg>
          <span>Blocked Fallopian Tube</span>
        </div>

        <svg class="svg-container" viewBox="0 0 260 190" aria-label="Diagram showing blocked fallopian tube preventing sperm from reaching egg">
          <defs>
            <radialGradient id="eggGradBlocked" cx="40%" cy="40%" r="60%">
              <stop offset="0%" stop-color="#fdba74"/>
              <stop offset="60%" stop-color="#ea580c"/>
              <stop offset="100%" stop-color="#c2410c"/>
            </radialGradient>
          </defs>

          
          <path d="M 20 180 C 40 140 50 110 70 95 C 100 75 160 60 205 70 C 220 73 235 85 240 100" 
                fill="none" stroke="#fbcfe8" stroke-width="26" stroke-linecap="round"/>
          
          
          <path d="M 20 180 C 40 140 50 110 70 95 C 100 75 160 60 205 70 C 220 73 235 85 240 100" 
                fill="none" stroke="#f8fafc" stroke-width="13" stroke-linecap="round"/>

          
          <path d="M 235 88 C 248 85 252 95 245 102 C 254 105 248 116 238 112 C 244 120 234 125 228 115" 
                fill="none" stroke="#f472b6" stroke-width="3.2" stroke-linecap="round"/>

          
          <ellipse cx="215" cy="135" rx="22" ry="16" fill="#fdf2f8" stroke="#f472b6" stroke-width="2"/>
          <text x="215" y="139" font-size="10.5" font-weight="700" fill="#be185d" text-anchor="middle">Ovary</text>

          
          <text x="46" y="168" font-size="10.5" font-weight="700" fill="#2563eb" text-anchor="start">Sperm</text>
          <text x="225" y="58" font-size="10.5" font-weight="700" fill="#ea580c" text-anchor="middle">Egg (Ovum)</text>
          <text x="26" y="186" font-size="9.5" font-weight="600" fill="#94a3b8" text-anchor="start">Uterus</text>

          
          <g class="anim-adhesions">
            
            <path d="M 120 62 Q 130 68 140 62 Q 136 74 142 80 Q 130 72 120 78 Z" fill="#b91c1c"/>
            <ellipse cx="130" cy="69" rx="11" ry="9" fill="#dc2626"/>
            
            <path d="M 123 63 L 137 75 M 137 63 L 123 75 M 121 69 L 139 69" stroke="#fee2e2" stroke-width="1.8" stroke-linecap="round"/>
          </g>
          
          <text x="130" y="47" font-size="9.5" font-weight="700" fill="#b91c1c" text-anchor="middle">Scar Tissue / Adhesion</text>

          
          <g class="anim-blocked-sperm">
            <ellipse cx="0" cy="0" rx="4.2" ry="2.6" fill="#2563eb"/>
            <path d="M -4 0 Q -8 -2.5 -12 0" fill="none" stroke="#2563eb" stroke-width="1.4" stroke-linecap="round"/>
          </g>

          
          <g class="anim-blocked-egg">
            <circle cx="0" cy="0" r="6" fill="url(#eggGradBlocked)" stroke="#ffffff" stroke-width="1.2"/>
            <circle cx="-1.5" cy="-1.5" r="1.8" fill="#fef08a"/>
          </g>

          
          <g transform="translate(108, 80)">
            <circle cx="0" cy="0" r="6" fill="#fee2e2" stroke="#dc2626" stroke-width="1.4"/>
            <line x1="-3.5" y1="0" x2="3.5" y2="0" stroke="#dc2626" stroke-width="1.8" stroke-linecap="round"/>
          </g>
        </svg>

        <div class="status-badge badge-blocked">
          <span>⛔</span> Blocked: Fertilization Prevented
        </div>
      </div>
    </div>
  </div>

</body>
</html>

Causes of Human Infertility in Females and Males

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px 8px;
      user-select: none;
    }

    /* Tab Switcher */
    .tabs {
      display: flex;
      gap: 8px;
      background: #f1f5f9;
      padding: 4px;
      border-radius: 24px;
      margin-bottom: 8px;
    }
    .tab-btn {
      border: none;
      background: transparent;
      padding: 6px 16px;
      border-radius: 18px;
      font-size: 14px;
      font-weight: 600;
      color: #64748b;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .tab-btn.active {
      background: #0284c7;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.35);
    }

    /* Viewport Area */
    .viewports {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      width: 100%;
      max-width: 580px;
    }

    .scope-col {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      flex: 1;
      max-width: 240px;
    }

    .scope-frame {
      position: relative;
      width: 100%;
      aspect-ratio: 1;
      border-radius: 50%;
      background: #090d16;
      border: 4px solid #1e293b;
      box-shadow: inset 0 0 20px rgba(0,0,0,0.8), 0 4px 12px rgba(0,0,0,0.15);
      overflow: hidden;
    }

    /* Reticle overlay */
    .scope-frame::after {
      content: "";
      position: absolute;
      inset: 0;
      border-radius: 50%;
      border: 1px dashed rgba(56, 189, 248, 0.15);
      pointer-events: none;
    }

    canvas {
      width: 100%;
      height: 100%;
      display: block;
    }

    /* Labels & Badges */
    .badge {
      font-size: 13px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .badge-normal {
      background: #e0f2fe;
      color: #0369a1;
    }
    .badge-abnormal {
      background: #fee2e2;
      color: #b91c1c;
    }

    .caption {
      font-size: 12px;
      font-weight: 500;
      color: #64748b;
      text-align: center;
      min-height: 16px;
    }
  </style>
</head>
<body>

  
  <div class="tabs">
    <button class="tab-btn active" onclick="setMode('count')">Count</button>
    <button class="tab-btn" onclick="setMode('motility')">Motility</button>
    <button class="tab-btn" onclick="setMode('morphology')">Morphology</button>
  </div>

  
  <div class="viewports">
    
    <div class="scope-col">
      <span class="badge badge-normal">Normal</span>
      <div class="scope-frame">
        <canvas id="canvasNormal" width="240" height="240"></canvas>
      </div>
      <span class="caption" id="capNormal">High density</span>
    </div>

    
    <div class="scope-col">
      <span class="badge badge-abnormal">Defective</span>
      <div class="scope-frame">
        <canvas id="canvasAbnormal" width="240" height="240"></canvas>
      </div>
      <span class="caption" id="capAbnormal">Low density</span>
    </div>
  </div>

  <script>
    let currentMode = 'count';
    const cNorm = document.getElementById('canvasNormal');
    const cAbnorm = document.getElementById('canvasAbnormal');
    const ctxNorm = cNorm.getContext('2d');
    const ctxAbnorm = cAbnorm.getContext('2d');

    const capNorm = document.getElementById('capNormal');
    const capAbnorm = document.getElementById('capAbnormal');
    const tabs = document.querySelectorAll('.tab-btn');

    const captions = {
      count: { norm: 'High density', abnorm: 'Low density' },
      motility: { norm: 'Progressive swim', abnorm: 'Non-progressive' },
      morphology: { norm: 'Standard form', abnorm: 'Abnormal forms' }
    };

    function setMode(mode) {
      currentMode = mode;
      tabs.forEach(t => {
        t.classList.toggle('active', t.textContent.toLowerCase() === mode);
      });
      capNorm.textContent = captions[mode].norm;
      capAbnorm.textContent = captions[mode].abnorm;
      initPopulations();
    }

    // Sperm particle generator
    class Sperm {
      constructor(type, custom = {}) {
        this.type = type; // 'normal', 'sparse', 'straight', 'circular', 'static', 'two-head', 'coiled', 'giant-head'
        this.x = custom.x ?? Math.random() * 200 + 20;
        this.y = custom.y ?? Math.random() * 200 + 20;
        this.angle = custom.angle ?? Math.random() * Math.PI * 2;
        this.speed = custom.speed ?? 1.2;
        this.tailWave = Math.random() * 10;
        this.waveSpeed = custom.waveSpeed ?? 0.3;
        this.size = custom.size ?? 1;
        this.spinRate = custom.spinRate ?? 0;
        this.trail = [];
      }

      update() {
        this.tailWave += this.waveSpeed;
        this.angle += this.spinRate;

        if (this.type !== 'static') {
          this.x += Math.cos(this.angle) * this.speed;
          this.y += Math.sin(this.angle) * this.speed;

          // Boundary wrap (circular clamp with wrap)
          const dx = this.x - 120;
          const dy = this.y - 120;
          if (dx * dx + dy * dy > 115 * 115) {
            this.x = 120 - dx * 0.92;
            this.y = 120 - dy * 0.92;
            this.trail = [];
          }
        }

        // Keep motion trail for motility visual
        if (currentMode === 'motility') {
          this.trail.push({ x: this.x, y: this.y });
          if (this.trail.length > 14) this.trail.shift();
        }
      }

      draw(ctx) {
        ctx.save();
        ctx.translate(this.x, this.y);
        ctx.rotate(this.angle);

        // Motion trail for motility comparison
        if (currentMode === 'motility' && this.trail.length > 1) {
          ctx.restore();
          ctx.save();
          ctx.beginPath();
          ctx.strokeStyle = this.type === 'straight' ? 'rgba(56, 189, 248, 0.35)' : 'rgba(244, 63, 94, 0.35)';
          ctx.lineWidth = 1.5;
          for (let i = 0; i < this.trail.length; i++) {
            if (i === 0) ctx.moveTo(this.trail[i].x, this.trail[i].y);
            else ctx.lineTo(this.trail[i].x, this.trail[i].y);
          }
          ctx.stroke();
          ctx.restore();
          ctx.save();
          ctx.translate(this.x, this.y);
          ctx.rotate(this.angle);
        }

        const headColor = '#f8fafc';
        const acrosomeColor = '#38bdf8';
        const tailColor = 'rgba(224, 242, 254, 0.75)';

        // Draw Tail
        ctx.strokeStyle = tailColor;
        ctx.lineWidth = 1.2 * this.size;
        ctx.beginPath();
        ctx.moveTo(-3 * this.size, 0);

        if (this.type === 'coiled') {
          // Curled / coiled tail defect
          for (let t = 0; t < 25; t++) {
            let r = (t / 25) * 8;
            let a = t * 0.5 + this.tailWave * 0.2;
            ctx.lineTo(-3 - Math.cos(a) * r, Math.sin(a) * r);
          }
        } else {
          // Standard swimming tail wave
          const tailLen = 22 * this.size;
          for (let i = 0; i < tailLen; i += 2) {
            const waveAmp = (i / tailLen) * (this.type === 'static' ? 0.5 : 3.5);
            const waveY = Math.sin(this.tailWave - i * 0.35) * waveAmp;
            ctx.lineTo(-3 * this.size - i, waveY);
          }
        }
        ctx.stroke();

        // Draw Morphology Variations
        if (this.type === 'two-head') {
          // Head 1
          ctx.fillStyle = headColor;
          ctx.beginPath();
          ctx.ellipse(3 * this.size, -3 * this.size, 4 * this.size, 2.5 * this.size, 0.2, 0, Math.PI * 2);
          ctx.fill();
          // Head 2
          ctx.beginPath();
          ctx.ellipse(3 * this.size, 3 * this.size, 4 * this.size, 2.5 * this.size, -0.2, 0, Math.PI * 2);
          ctx.fill();
        } else if (this.type === 'giant-head') {
          // Macrocephalic round head
          ctx.fillStyle = headColor;
          ctx.beginPath();
          ctx.arc(3 * this.size, 0, 5.5 * this.size, 0, Math.PI * 2);
          ctx.fill();
          ctx.fillStyle = acrosomeColor;
          ctx.beginPath();
          ctx.arc(4.5 * this.size, 0, 3 * this.size, -Math.PI / 2, Math.PI / 2);
          ctx.fill();
        } else {
          // Standard Oval Head
          const headLen = 4 * this.size;
          const headW = 2.4 * this.size;
          ctx.fillStyle = headColor;
          ctx.beginPath();
          ctx.ellipse(headLen * 0.5, 0, headLen, headW, 0, 0, Math.PI * 2);
          ctx.fill();

          // Acrosome Cap
          ctx.fillStyle = acrosomeColor;
          ctx.beginPath();
          ctx.ellipse(headLen * 0.9, 0, headLen * 0.45, headW * 0.85, 0, -Math.PI/2, Math.PI/2);
          ctx.fill();
        }

        ctx.restore();
      }
    }

    let popNorm = [];
    let popAbnorm = [];

    function initPopulations() {
      popNorm = [];
      popAbnorm = [];

      if (currentMode === 'count') {
        // High count (~28 cells)
        for (let i = 0; i < 28; i++) {
          popNorm.push(new Sperm('normal', { speed: 0.8 + Math.random() * 0.6 }));
        }
        // Low count (2 cells)
        for (let i = 0; i < 2; i++) {
          popAbnorm.push(new Sperm('sparse', { speed: 0.8 + Math.random() * 0.6 }));
        }
      } else if (currentMode === 'motility') {
        // Normal: Fast progressive straight swimming
        for (let i = 0; i < 9; i++) {
          popNorm.push(new Sperm('straight', { speed: 1.8, waveSpeed: 0.45 }));
        }
        // Defective: Static, spinning tight circles, twitching
        popAbnorm.push(new Sperm('circular', { x: 80, y: 100, speed: 1.0, spinRate: 0.08, waveSpeed: 0.3 }));
        popAbnorm.push(new Sperm('circular', { x: 160, y: 150, speed: 0.9, spinRate: -0.09, waveSpeed: 0.3 }));
        popAbnorm.push(new Sperm('static', { x: 120, y: 70, speed: 0, waveSpeed: 0.02 }));
        popAbnorm.push(new Sperm('static', { x: 70, y: 160, speed: 0, waveSpeed: 0.02 }));
        popAbnorm.push(new Sperm('static', { x: 160, y: 80, speed: 0, waveSpeed: 0.02 }));
      } else if (currentMode === 'morphology') {
        // Normal: 2 clean zoomed standard forms
        popNorm.push(new Sperm('normal', { x: 110, y: 90, angle: -0.4, speed: 0.4, size: 2.0 }));
        popNorm.push(new Sperm('normal', { x: 130, y: 160, angle: 2.8, speed: 0.4, size: 2.0 }));

        // Defective: Zoomed distinct defective forms
        popAbnorm.push(new Sperm('two-head', { x: 110, y: 65, angle: 0.1, speed: 0.3, size: 1.8 }));
        popAbnorm.push(new Sperm('coiled', { x: 80, y: 150, angle: 2.2, speed: 0.2, size: 1.8 }));
        popAbnorm.push(new Sperm('giant-head', { x: 160, y: 145, angle: -1.8, speed: 0.3, size: 1.8 }));
      }
    }

    function render() {
      // Clear normal
      ctxNorm.fillStyle = '#090d16';
      ctxNorm.fillRect(0, 0, 240, 240);

      // Clear abnormal
      ctxAbnorm.fillStyle = '#090d16';
      ctxAbnorm.fillRect(0, 0, 240, 240);

      // Update & draw normal
      for (const s of popNorm) {
        s.update();
        s.draw(ctxNorm);
      }

      // Update & draw abnormal
      for (const s of popAbnorm) {
        s.update();
        s.draw(ctxAbnorm);
      }

      requestAnimationFrame(render);
    }

    // Start
    initPopulations();
    requestAnimationFrame(render);
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <script src="{{VENDOR_CDN}}/gsap.min.js"></script>
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html, body {
      width: 100%;
      height: 100%;
      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: space-between;
      padding: 10px 12px;
      overflow: hidden;
      user-select: none;
    }

    /* Controls Header */
    .controls {
      display: flex;
      gap: 8px;
      z-index: 10;
      width: 100%;
      max-width: 440px;
      justify-content: center;
    }

    .tab-btn {
      flex: 1;
      padding: 7px 12px;
      font-size: 13px;
      font-weight: 600;
      border-radius: 8px;
      border: 1px solid #e2e8f0;
      background: #ffffff;
      color: #64748b;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    }

    .tab-btn.active {
      background: #2563eb;
      color: #ffffff;
      border-color: #2563eb;
      box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
    }

    .tab-btn.active.alert-tab {
      background: #dc2626;
      border-color: #dc2626;
      box-shadow: 0 2px 6px rgba(220, 38, 38, 0.25);
    }

    /* SVG Scene Area */
    .scene-container {
      width: 100%;
      max-width: 520px;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    svg {
      width: 100%;
      height: 100%;
      max-height: 420px;
      overflow: visible;
    }

    /* Status Pill */
    .status-badge {
      font-size: 13px;
      font-weight: 700;
      padding: 4px 12px;
      border-radius: 20px;
      letter-spacing: 0.2px;
      display: inline-flex;
      align-items: center;
      gap: 5px;
      transition: all 0.3s ease;
    }

    .status-normal {
      background: #ecfdf5;
      color: #059669;
      border: 1px solid #a7f3d0;
    }

    .status-fault {
      background: #fef2f2;
      color: #dc2626;
      border: 1px solid #fecaca;
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <button id="btnNormal" class="tab-btn active" onclick="setMode('normal')">
      <span>●</span> Normal Cycle
    </button>
    <button id="btnLow" class="tab-btn" onclick="setMode('low')">
      <span>✕</span> Low FSH / LH
    </button>
  </div>

  
  <div class="scene-container">
    <svg viewBox="0 0 460 360">
      <defs>
        
        <linearGradient id="pituitaryGlow" x1="0%" y1="0%" x2="0%" y2="100%">
          <stop offset="0%" stop-color="#fbcfe8" />
          <stop offset="100%" stop-color="#f472b6" />
        </linearGradient>

        <linearGradient id="ovaryGrad" x1="0%" y1="0%" x2="100%" y2="100%">
          <stop offset="0%" stop-color="#fff7ed" />
          <stop offset="100%" stop-color="#ffedd5" />
        </linearGradient>

        <linearGradient id="tubeGrad" x1="0%" y1="0%" x2="100%" y2="0%">
          <stop offset="0%" stop-color="#fda4af" stop-opacity="0.35" />
          <stop offset="100%" stop-color="#fda4af" stop-opacity="0.85" />
        </linearGradient>

        
        <filter id="glowFsh" x="-30%" y="-30%" width="160%" height="160%">
          <feGaussianBlur stdDeviation="2" result="blur" />
          <feComposite in="SourceGraphic" in2="blur" operator="over" />
        </filter>
        <filter id="glowLh" x="-30%" y="-30%" width="160%" height="160%">
          <feGaussianBlur stdDeviation="2.5" result="blur" />
          <feComposite in="SourceGraphic" in2="blur" operator="over" />
        </filter>
      </defs>

      
      <path id="pathFSH" d="M 210,56 C 165,95 145,150 170,225" fill="none" stroke="#bfdbfe" stroke-width="2" stroke-dasharray="3 3" />
      <path id="pathLH" d="M 250,56 C 295,95 315,150 285,225" fill="none" stroke="#e9d5ff" stroke-width="2" stroke-dasharray="3 3" />

      
      <g transform="translate(230, 42)">
        
        <path d="M -70,-22 C -70,-34 70,-34 70,-22 C 70,0 45,16 30,22 L -30,22 C -45,16 -70,0 -70,-22 Z" fill="#f1f5f9" stroke="#cbd5e1" stroke-width="1.5" />
        
        <circle id="pituitaryBody" cx="0" cy="10" r="16" fill="url(#pituitaryGlow)" stroke="#db2777" stroke-width="1.5" />
        <text x="0" y="-12" text-anchor="middle" font-size="11" font-weight="700" fill="#475569">Pituitary</text>
      </g>

      
      <g transform="translate(112, 130)">
        <rect x="-6" y="-13" width="70" height="20" rx="10" fill="#eff6ff" stroke="#bfdbfe" stroke-width="1"/>
        <circle cx="2" cy="-3" r="4" fill="#2563eb" />
        <text x="12" y="1" font-size="10.5" font-weight="700" fill="#1d4ed8">FSH</text>
      </g>

      <g transform="translate(288, 130)">
        <rect x="-6" y="-13" width="64" height="20" rx="10" fill="#faf5ff" stroke="#e9d5ff" stroke-width="1"/>
        <circle cx="2" cy="-3" r="4" fill="#9333ea" />
        <text x="12" y="1" font-size="10.5" font-weight="700" fill="#7e22ce">LH</text>
      </g>

      
      <g id="particlesFSH"></g>
      <g id="particlesLH"></g>

      
      
      <path d="M 330,215 C 345,210 365,225 385,225 C 405,225 425,210 440,195" fill="none" stroke="url(#tubeGrad)" stroke-width="20" stroke-linecap="round" />
      <path d="M 326,205 C 330,216 333,230 330,240" fill="none" stroke="#fb7185" stroke-width="3" stroke-linecap="round" />
      <path d="M 334,208 C 338,220 340,232 336,242" fill="none" stroke="#fb7185" stroke-width="2.5" stroke-linecap="round" />

      
      <ellipse cx="225" cy="265" rx="115" ry="68" fill="url(#ovaryGrad)" stroke="#fdba74" stroke-width="2" />
      <text x="145" y="318" font-size="11" font-weight="700" fill="#9a3412">Ovary</text>

      
      <g id="follicleStage" transform="translate(195, 265)">
        <circle id="follicleOuter" cx="0" cy="0" r="16" fill="#fed7aa" stroke="#f97316" stroke-width="2" />
        <circle id="follicleInner" cx="0" cy="0" r="8" fill="#ffedd5" stroke="#ea580c" stroke-width="1.5" />
        <circle id="follicleOocyte" cx="0" cy="0" r="4.5" fill="#f43f5e" />
      </g>

      
      <g id="ovulationSite" transform="translate(290, 245)">
        
        <path id="ruptureWall" d="M -10,-12 Q 0,-4 8,-14" fill="none" stroke="#ea580c" stroke-width="2" opacity="0"/>
      </g>

      
      <g id="eggCell" transform="translate(195, 265)" opacity="0">
        
        <circle cx="0" cy="0" r="9" fill="#fecdd3" stroke="#f43f5e" stroke-width="1.5" stroke-dasharray="2 1" />
        
        <circle cx="0" cy="0" r="5" fill="#e11d48" />
      </g>

      
      <g id="stalledIcon" transform="translate(195, 265)" opacity="0">
        <circle cx="0" cy="0" r="14" fill="#fee2e2" stroke="#ef4444" stroke-width="1.5" />
        <text x="0" y="4.5" text-anchor="middle" font-size="14" font-weight="900" fill="#dc2626">✕</text>
      </g>
    </svg>
  </div>

  
  <div id="statusPill" class="status-badge status-normal">
    <span>✦</span> Ovulation ✓
  </div>

  <script>
    let currentMode = 'normal';
    let tl = null;

    // Create hormone particle elements dynamically
    const fshGroup = document.getElementById('particlesFSH');
    const lhGroup = document.getElementById('particlesLH');

    for (let i = 0; i < 7; i++) {
      const c = document.createElementNS('http://www.w3.org/2000/svg', 'circle');
      c.setAttribute('r', '4');
      c.setAttribute('fill', '#2563eb');
      c.setAttribute('filter', 'url(#glowFsh)');
      c.setAttribute('class', 'p-fsh');
      fshGroup.appendChild(c);
    }

    for (let i = 0; i < 7; i++) {
      const c = document.createElementNS('http://www.w3.org/2000/svg', 'circle');
      c.setAttribute('r', '4.5');
      c.setAttribute('fill', '#9333ea');
      c.setAttribute('filter', 'url(#glowLh)');
      c.setAttribute('class', 'p-lh');
      lhGroup.appendChild(c);
    }

    function runAnimation() {
      if (tl) tl.kill();
      tl = gsap.timeline({ repeat: -1, repeatDelay: 1.2 });

      const fshDots = gsap.utils.toArray('.p-fsh');
      const lhDots = gsap.utils.toArray('.p-lh');

      if (currentMode === 'normal') {
        // RESET
        gsap.set('#eggCell', { opacity: 0, x: 195, y: 265, scale: 1 });
        gsap.set('#stalledIcon', { opacity: 0, scale: 0.5 });
        gsap.set('#follicleOuter', { attr: { r: 10 }, fill: '#fed7aa', stroke: '#f97316' });
        gsap.set('#follicleInner', { attr: { r: 5 }, opacity: 1 });
        gsap.set('#follicleOocyte', { opacity: 1 });
        gsap.set('#ruptureWall', { opacity: 0 });
        gsap.set(fshDots, { opacity: 0 });
        gsap.set(lhDots, { opacity: 0 });

        // 1. Pituitary pulses & sends FSH
        tl.to('#pituitaryBody', { scale: 1.15, transformOrigin: 'center', duration: 0.4, yoyo: true, repeat: 1, ease: 'sine.inOut' })
          .add('fshFlow')
          
        fshDots.forEach((dot, idx) => {
          tl.fromTo(dot, 
            { opacity: 0, x: 210, y: 56 },
            { 
              duration: 1.4, 
              opacity: 1,
              ease: 'power1.inOut',
              motionPath: {
                path: '#pathFSH',
                align: '#pathFSH',
                alignOrigin: [0.5, 0.5]
              }
            }, 
            `fshFlow+=${idx * 0.16}`
          );
        });

        // 2. FSH activates Follicle Growth (Stage 1)
        tl.to('#follicleOuter', { attr: { r: 24 }, fill: '#fef08a', stroke: '#eab308', duration: 1.2, ease: 'back.out(1.5)' }, 'fshFlow+=0.8')
          .to('#follicleInner', { attr: { r: 14 }, duration: 1.2, ease: 'back.out(1.5)' }, 'fshFlow+=0.8')
          .to('#follicleStage', { x: 260, y: 255, duration: 1 }, 'fshFlow+=1.0')

        // 3. LH Surge triggers Ovulation (Stage 2)
        tl.add('lhFlow', '-=0.2');
        tl.to('#pituitaryBody', { scale: 1.2, transformOrigin: 'center', duration: 0.35, yoyo: true, repeat: 1 }, 'lhFlow');

        lhDots.forEach((dot, idx) => {
          tl.fromTo(dot,
            { opacity: 0, x: 250, y: 56 },
            {
              duration: 1.2,
              opacity: 1,
              ease: 'power1.inOut',
              motionPath: {
                path: '#pathLH',
                align: '#pathLH',
                alignOrigin: [0.5, 0.5]
              }
            },
            `lhFlow+=${idx * 0.12}`
          );
        });

        // 4. Follicle Rupture & Egg Release into Fallopian Tube
        tl.to('#ruptureWall', { opacity: 1, duration: 0.2 }, 'lhFlow+=0.9')
          .set('#eggCell', { opacity: 1, x: 260, y: 255 }, 'lhFlow+=0.9')
          .to('#follicleOocyte', { opacity: 0, duration: 0.2 }, 'lhFlow+=0.9')
          .to('#follicleOuter', { attr: { r: 15 }, fill: '#fde047', stroke: '#ca8a04', duration: 0.6 }, 'lhFlow+=1.0')
          .to('#eggCell', {
            x: 375,
            y: 220,
            duration: 1.6,
            ease: 'power2.out'
          }, 'lhFlow+=0.95')
          .to('#eggCell', {
            scale: 1.1,
            repeat: 1,
            yoyo: true,
            duration: 0.4
          }, '-=0.5');

      } else {
        // LOW FSH/LH MODE
        gsap.set('#eggCell', { opacity: 0 });
        gsap.set('#ruptureWall', { opacity: 0 });
        gsap.set(fshDots, { opacity: 0 });
        gsap.set(lhDots, { opacity: 0 });
        gsap.set('#follicleStage', { x: 195, y: 265 });

        // Weak/no pituitary signal
        tl.to('#pituitaryBody', { fill: '#cbd5e1', stroke: '#94a3b8', duration: 0.4 })
          .fromTo('#follicleOuter', 
            { attr: { r: 10 }, fill: '#fed7aa', stroke: '#f97316' },
            { attr: { r: 9 }, fill: '#f1f5f9', stroke: '#94a3b8', duration: 1 }
          )
          .to('#follicleInner', { fill: '#e2e8f0', stroke: '#cbd5e1', duration: 1 }, '<')
          .to('#stalledIcon', { opacity: 1, scale: 1, duration: 0.5, ease: 'back.out(2)' }, '-=0.2')
          .to('#stalledIcon', { scale: 1.1, repeat: 1, yoyo: true, duration: 0.4 }, '+=0.5');
      }
    }

    function setMode(mode) {
      currentMode = mode;
      const btnNormal = document.getElementById('btnNormal');
      const btnLow = document.getElementById('btnLow');
      const statusPill = document.getElementById('statusPill');

      if (mode === 'normal') {
        btnNormal.className = 'tab-btn active';
        btnLow.className = 'tab-btn';
        statusPill.className = 'status-badge status-normal';
        statusPill.innerHTML = '<span>✦</span> Ovulation ✓';
      } else {
        btnNormal.className = 'tab-btn';
        btnLow.className = 'tab-btn active alert-tab';
        statusPill.className = 'status-badge status-fault';
        statusPill.innerHTML = '<span>✕</span> Ovulatory Failure';
      }

      runAnimation();
    }

    // Start immediately
    window.addEventListener('DOMContentLoaded', () => {
      runAnimation();
    });
  </script>
</body>
</html>

UK-GCSE-SCIENCE-BIO-CC-02-06

Aligned learning resources

Related diagrams