<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Systematic vs Random Error</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;
      gap: 12px;
      user-select: none;
      max-width: 680px;
      margin: 0 auto;
    }

    .controls {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 8px;
    }

    .tab-btn {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      cursor: pointer;
      transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
    }

    .tab-btn:hover {
      background: #e2e8f0;
      color: #0f172a;
    }

    .tab-btn.active {
      background: #0f172a;
      color: #ffffff;
      border-color: #0f172a;
    }

    .diagram-content {
      display: flex;
      flex-direction: column;
      gap: 10px;
      width: 100%;
    }

    .scenario-card {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      padding: 10px 12px 6px;
      transition: opacity 0.25s ease;
    }

    .scenario-card.dimmed {
      opacity: 0.22;
    }

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

    .badge {
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.3px;
      padding: 3px 8px;
      border-radius: 4px;
    }

    .badge-purple {
      background: #ede9fe;
      color: #581c87;
    }

    .badge-teal {
      background: #ccfbf1;
      color: #115e59;
    }

    .desc-tag {
      font-size: 12px;
      font-weight: 600;
      color: #334155;
    }

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

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

    .axis-section {
      padding: 0 12px;
      margin-top: -2px;
    }

    .legend-note {
      text-align: center;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
      margin-top: 2px;
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <button class="tab-btn active" onclick="setMode('all')">Compare Both</button>
    <button class="tab-btn" onclick="setMode('systematic')">Systematic Error</button>
    <button class="tab-btn" onclick="setMode('random')">Random Error</button>
  </div>

  <div class="diagram-content">
    
    
    <div id="cardSystematic" class="scenario-card">
      <div class="header-row">
        <span class="badge badge-purple">Scenario A: Systematic Error</span>
        <span class="desc-tag">Consistent shift (+4.2) caused by zero error</span>
      </div>
      <div class="svg-container">
        <svg viewBox="0 0 500 70" preserveAspectRatio="xMidYMid meet">
          <defs>
            <marker id="arrow-purple" viewBox="0 0 10 10" refX="7" refY="5" markerWidth="6" markerHeight="6" orient="auto">
              <path d="M 1 2 L 8 5 L 1 8 z" fill="#6d28d9" />
            </marker>
          </defs>

          
          <line x1="30" y1="46" x2="470" y2="46" stroke="#cbd5e1" stroke-width="1.5" stroke-dasharray="3 3" />
          
          
          <line x1="206" y1="6" x2="206" y2="64" stroke="#64748b" stroke-width="1.5" stroke-dasharray="3 3" />
          
          
          <line x1="206" y1="18" x2="384" y2="18" stroke="#6d28d9" stroke-width="2" marker-end="url(#arrow-purple)" />
          <text x="298" y="13" fill="#581c87" font-size="12" font-weight="700" text-anchor="middle">+4.2 shift</text>
          
          
          <circle cx="386.4" cy="46" r="5.5" fill="#8b5cf6" stroke="#4c1d95" stroke-width="1.5" />
          <circle cx="390.8" cy="38" r="5.5" fill="#8b5cf6" stroke="#4c1d95" stroke-width="1.5" />
          <circle cx="390.8" cy="54" r="5.5" fill="#8b5cf6" stroke="#4c1d95" stroke-width="1.5" />
        </svg>
      </div>
    </div>

    
    <div id="cardRandom" class="scenario-card">
      <div class="header-row">
        <span class="badge badge-teal">Scenario B: Random Error</span>
        <span class="desc-tag">Unpredictable spread around true value</span>
      </div>
      <div class="svg-container">
        <svg viewBox="0 0 500 70" preserveAspectRatio="xMidYMid meet">
          <defs>
            <marker id="arrow-teal-r" viewBox="0 0 10 10" refX="7" refY="5" markerWidth="6" markerHeight="6" orient="auto">
              <path d="M 1 2 L 8 5 L 1 8 z" fill="#0f766e" />
            </marker>
            <marker id="arrow-teal-l" viewBox="0 0 10 10" refX="3" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
              <path d="M 9 2 L 2 5 L 9 8 z" fill="#0f766e" />
            </marker>
          </defs>

          
          <line x1="30" y1="46" x2="470" y2="46" stroke="#cbd5e1" stroke-width="1.5" stroke-dasharray="3 3" />
          
          
          <line x1="206" y1="6" x2="206" y2="64" stroke="#64748b" stroke-width="1.5" stroke-dasharray="3 3" />
          
          
          <line x1="133" y1="18" x2="283" y2="18" stroke="#0f766e" stroke-width="2" marker-start="url(#arrow-teal-l)" marker-end="url(#arrow-teal-r)" />
          <text x="206" y="13" fill="#0f766e" font-size="12" font-weight="700" text-anchor="middle">Spread (±)</text>
          
          
          <circle cx="126.8" cy="46" r="5.5" fill="#14b8a6" stroke="#115e59" stroke-width="1.5" />
          <circle cx="210.4" cy="46" r="5.5" fill="#14b8a6" stroke="#115e59" stroke-width="1.5" />
          <circle cx="289.6" cy="46" r="5.5" fill="#14b8a6" stroke="#115e59" stroke-width="1.5" />
        </svg>
      </div>
    </div>

    
    <div class="axis-section">
      <svg viewBox="0 0 500 52" preserveAspectRatio="xMidYMid meet">
        
        <line x1="30" y1="8" x2="470" y2="8" stroke="#334155" stroke-width="2" stroke-linecap="round" />

        
        <line x1="30" y1="8" x2="30" y2="16" stroke="#334155" stroke-width="1.5" />
        <text x="30" y="30" fill="#334155" font-size="12" font-weight="600" text-anchor="middle">96.0</text>

        
        <line x1="118" y1="8" x2="118" y2="16" stroke="#334155" stroke-width="1.5" />
        <text x="118" y="30" fill="#334155" font-size="12" font-weight="600" text-anchor="middle">98.0</text>

        
        <line x1="206" y1="4" x2="206" y2="20" stroke="#0f172a" stroke-width="2.5" />
        <text x="206" y="30" fill="#0f172a" font-size="13" font-weight="800" text-anchor="middle">100.0</text>
        <text x="206" y="44" fill="#b45309" font-size="11" font-weight="800" text-anchor="middle">True Value</text>

        
        <line x1="294" y1="8" x2="294" y2="16" stroke="#334155" stroke-width="1.5" />
        <text x="294" y="30" fill="#334155" font-size="12" font-weight="600" text-anchor="middle">102.0</text>

        
        <line x1="382" y1="8" x2="382" y2="16" stroke="#334155" stroke-width="1.5" />
        <text x="382" y="30" fill="#334155" font-size="12" font-weight="600" text-anchor="middle">104.0</text>

        
        <line x1="470" y1="8" x2="470" y2="16" stroke="#334155" stroke-width="1.5" />
        <text x="470" y="30" fill="#334155" font-size="12" font-weight="600" text-anchor="middle">106.0</text>
      </svg>
      <div class="legend-note">Scale: measured values on horizontal axis</div>
    </div>

  </div>

  <script>
    function setMode(mode) {
      const cardSys = document.getElementById('cardSystematic');
      const cardRand = document.getElementById('cardRandom');
      const btns = document.querySelectorAll('.tab-btn');

      btns.forEach(b => b.classList.remove('active'));

      if (mode === 'all') {
        btns[0].classList.add('active');
        cardSys.classList.remove('dimmed');
        cardRand.classList.remove('dimmed');
      } else if (mode === 'systematic') {
        btns[1].classList.add('active');
        cardSys.classList.remove('dimmed');
        cardRand.classList.add('dimmed');
      } else if (mode === 'random') {
        btns[2].classList.add('active');
        cardSys.classList.add('dimmed');
        cardRand.classList.remove('dimmed');
      }
    }
  </script>
</body>
</html>

Accuracy, Precision and Sources of Error in Measurements

<!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">
  <title>Accuracy vs Precision</title>
  <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: #1e293b;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    /* Target Bar */
    .target-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      padding: 6px 12px;
      font-size: 13px;
      font-weight: 600;
    }
    .target-val {
      color: #0284c7;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* Filter Controls */
    .filter-bar {
      display: flex;
      gap: 6px;
      flex-wrap: wrap;
    }
    .filter-btn {
      flex: 1 1 auto;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 6px 10px;
      font-size: 12px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      text-align: center;
      transition: background-color 0.2s, border-color 0.2s, color 0.2s;
    }
    .filter-btn.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
    }

    /* Grid of Cards */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 8px;
    }
    @media (max-width: 540px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
    }

    .group-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 10px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      transition: opacity 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
    }
    .group-card.dimmed {
      opacity: 0.35;
    }
    .group-card.highlighted {
      border-color: #0284c7;
      box-shadow: 0 0 0 2px rgba(2, 132, 199, 0.2);
    }

    .card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      font-weight: 700;
    }

    /* SVG Strip Chart */
    .chart-container {
      width: 100%;
      height: 48px;
      background: #f1f5f9;
      border-radius: 6px;
      overflow: hidden;
    }
    svg {
      width: 100%;
      height: 100%;
      display: block;
    }

    /* Data Row */
    .data-row {
      display: flex;
      justify-content: space-between;
      font-size: 11px;
      background: #f8fafc;
      padding: 4px 6px;
      border-radius: 4px;
      border: 1px solid #e2e8f0;
    }
    .data-item {
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    .data-label {
      color: #64748b;
      font-size: 9px;
      text-transform: uppercase;
      font-weight: 600;
    }
    .data-value {
      font-weight: 700;
      color: #0f172a;
    }

    /* Badges */
    .badges-container {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .badge-row {
      display: flex;
      gap: 4px;
    }
    .badge {
      flex: 1;
      font-size: 10px;
      font-weight: 700;
      padding: 3px 4px;
      border-radius: 4px;
      text-align: center;
      white-space: nowrap;
    }
    .badge-good {
      background: #dcfce7;
      color: #15803d;
      border: 1px solid #86efac;
    }
    .badge-bad {
      background: #fee2e2;
      color: #b91c1c;
      border: 1px solid #fca5a5;
    }

    .error-tag {
      font-size: 10px;
      font-weight: 700;
      padding: 4px 6px;
      border-radius: 4px;
      text-align: center;
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      color: #334155;
    }
    .tag-systematic {
      background: #fef3c7;
      color: #92400e;
      border-color: #fde68a;
    }
    .tag-random {
      background: #ffedd5;
      color: #9a3412;
      border-color: #fed7aa;
    }
    .tag-ideal {
      background: #ecfdf5;
      color: #065f46;
      border-color: #a7f3d0;
    }
  </style>
</head>
<body>

  
  <div class="target-banner">
    <span>True Boiling Point</span>
    <span class="target-val">🎯 100.0°C</span>
  </div>

  
  <div class="filter-bar">
    <button class="filter-btn active" data-filter="all">All Groups</button>
    <button class="filter-btn" data-filter="group-a">Group A</button>
    <button class="filter-btn" data-filter="group-b">Group B</button>
    <button class="filter-btn" data-filter="group-c">Group C</button>
  </div>

  
  <div class="cards-grid">

    
    <div class="group-card" id="card-group-a">
      <div class="card-header">
        <span>Group A</span>
        <span style="font-size: 11px; color: #64748b;">3 Trials</span>
      </div>

      
      <div class="chart-container">
        <svg viewBox="0 0 200 48">
          
          <line x1="20" y1="36" x2="180" y2="36" stroke="#cbd5e1" stroke-width="2" />
          <text x="20" y="45" font-size="8" fill="#94a3b8" text-anchor="middle">97°</text>
          <text x="80" y="45" font-size="8" fill="#0284c7" font-weight="700" text-anchor="middle">100°</text>
          <text x="170" y="45" font-size="8" fill="#94a3b8" text-anchor="middle">106°</text>

          
          <line x1="80" y1="4" x2="80" y2="34" stroke="#0284c7" stroke-width="1.5" stroke-dasharray="2,2" />

          
          <circle cx="147.5" cy="18" r="4.5" fill="#ea580c" opacity="0.85" />
          <circle cx="149.0" cy="12" r="4.5" fill="#ea580c" opacity="0.85" />
          <circle cx="147.5" cy="24" r="4.5" fill="#ea580c" opacity="0.85" />

          
          <polygon points="148,29 144,35 152,35" fill="#c2410c" />
        </svg>
      </div>

      <div class="data-row">
        <div class="data-item">
          <span class="data-label">Mean (x̄)</span>
          <span class="data-value">104.5°C</span>
        </div>
        <div class="data-item">
          <span class="data-label">Range (R)</span>
          <span class="data-value">0.1°C</span>
        </div>
      </div>

      <div class="badges-container">
        <div class="badge-row">
          <span class="badge badge-good">High Precision</span>
          <span class="badge badge-bad">Low Accuracy</span>
        </div>
        <div class="error-tag tag-systematic">Systematic Error</div>
      </div>
    </div>

    
    <div class="group-card" id="card-group-b">
      <div class="card-header">
        <span>Group B</span>
        <span style="font-size: 11px; color: #64748b;">3 Trials</span>
      </div>

      
      <div class="chart-container">
        <svg viewBox="0 0 200 48">
          
          <line x1="20" y1="36" x2="180" y2="36" stroke="#cbd5e1" stroke-width="2" />
          <text x="20" y="45" font-size="8" fill="#94a3b8" text-anchor="middle">97°</text>
          <text x="80" y="45" font-size="8" fill="#0284c7" font-weight="700" text-anchor="middle">100°</text>
          <text x="170" y="45" font-size="8" fill="#94a3b8" text-anchor="middle">106°</text>

          
          <line x1="80" y1="4" x2="80" y2="34" stroke="#0284c7" stroke-width="1.5" stroke-dasharray="2,2" />

          
          <circle cx="51.5" cy="18" r="4.5" fill="#ea580c" opacity="0.85" />
          <circle cx="80.0" cy="18" r="4.5" fill="#16a34a" opacity="0.85" />
          <circle cx="108.5" cy="18" r="4.5" fill="#ea580c" opacity="0.85" />

          
          <polygon points="80,29 76,35 84,35" fill="#16a34a" />
        </svg>
      </div>

      <div class="data-row">
        <div class="data-item">
          <span class="data-label">Mean (x̄)</span>
          <span class="data-value">100.0°C</span>
        </div>
        <div class="data-item">
          <span class="data-label">Range (R)</span>
          <span class="data-value">3.8°C</span>
        </div>
      </div>

      <div class="badges-container">
        <div class="badge-row">
          <span class="badge badge-bad">Low Precision</span>
          <span class="badge badge-good">High Accuracy</span>
        </div>
        <div class="error-tag tag-random">Random Error</div>
      </div>
    </div>

    
    <div class="group-card" id="card-group-c">
      <div class="card-header">
        <span>Group C</span>
        <span style="font-size: 11px; color: #64748b;">3 Trials</span>
      </div>

      
      <div class="chart-container">
        <svg viewBox="0 0 200 48">
          
          <line x1="20" y1="36" x2="180" y2="36" stroke="#cbd5e1" stroke-width="2" />
          <text x="20" y="45" font-size="8" fill="#94a3b8" text-anchor="middle">97°</text>
          <text x="80" y="45" font-size="8" fill="#0284c7" font-weight="700" text-anchor="middle">100°</text>
          <text x="170" y="45" font-size="8" fill="#94a3b8" text-anchor="middle">106°</text>

          
          <line x1="80" y1="4" x2="80" y2="34" stroke="#0284c7" stroke-width="1.5" stroke-dasharray="2,2" />

          
          <circle cx="81.5" cy="12" r="4.5" fill="#16a34a" opacity="0.85" />
          <circle cx="80.0" cy="18" r="4.5" fill="#16a34a" opacity="0.85" />
          <circle cx="81.5" cy="24" r="4.5" fill="#16a34a" opacity="0.85" />

          
          <polygon points="81,29 77,35 85,35" fill="#16a34a" />
        </svg>
      </div>

      <div class="data-row">
        <div class="data-item">
          <span class="data-label">Mean (x̄)</span>
          <span class="data-value">100.1°C</span>
        </div>
        <div class="data-item">
          <span class="data-label">Range (R)</span>
          <span class="data-value">0.1°C</span>
        </div>
      </div>

      <div class="badges-container">
        <div class="badge-row">
          <span class="badge badge-good">High Precision</span>
          <span class="badge badge-good">High Accuracy</span>
        </div>
        <div class="error-tag tag-ideal">Minimal Error</div>
      </div>
    </div>

  </div>

  <script src="{{VENDOR_CDN}}/classace-diagram.js"></script>
  <script>
    const filterBtns = document.querySelectorAll('.filter-btn');
    const cards = document.querySelectorAll('.group-card');

    filterBtns.forEach(btn => {
      btn.addEventListener('click', () => {
        filterBtns.forEach(b => b.classList.remove('active'));
        btn.classList.add('active');

        const filter = btn.getAttribute('data-filter');

        cards.forEach(card => {
          if (filter === 'all') {
            card.classList.remove('dimmed', 'highlighted');
          } else {
            if (card.id === `card-${filter}`) {
              card.classList.remove('dimmed');
              card.classList.add('highlighted');
            } else {
              card.classList.add('dimmed');
              card.classList.remove('highlighted');
            }
          }
        });
      });
    });

    // Tap card directly to filter
    cards.forEach(card => {
      card.addEventListener('click', () => {
        const id = card.id.replace('card-', '');
        const targetBtn = document.querySelector(`.filter-btn[data-filter="${id}"]`);
        if (targetBtn) targetBtn.click();
      });
    });
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="1:1">
  <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: 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }
    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 8px;
      width: 100%;
      max-width: 440px;
    }
    .target-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 8px 6px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      transition: box-shadow 0.2s ease, border-color 0.2s ease;
      cursor: pointer;
      user-select: none;
    }
    .target-card:hover {
      border-color: #cbd5e1;
      box-shadow: 0 3px 8px rgba(0, 0, 0, 0.05);
    }
    .target-card.active {
      border-color: #22b7ff;
      box-shadow: 0 0 0 2px rgba(34, 183, 255, 0.25);
    }
    .badges {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 4px;
      margin-bottom: 4px;
      width: 100%;
    }
    .badge {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 6px;
      letter-spacing: 0.2px;
      white-space: nowrap;
    }
    .badge-high {
      background: #dcfce7;
      color: #15803d;
      border: 1px solid #bbf7d0;
    }
    .badge-low {
      background: #fee2e2;
      color: #b91c1c;
      border: 1px solid #fecaca;
    }
    .svg-wrap {
      width: 100%;
      max-width: 130px;
      aspect-ratio: 1;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    svg {
      width: 100%;
      height: 100%;
      display: block;
    }
    .dart {
      fill: #ef4444;
      stroke: #ffffff;
      stroke-width: 1.5;
      filter: drop-shadow(0px 1px 2px rgba(0,0,0,0.3));
    }
    .mean-marker {
      fill: #3b82f6;
      stroke: #ffffff;
      stroke-width: 1.5;
      opacity: 0;
      transition: opacity 0.25s ease;
    }
    .mean-ring {
      fill: none;
      stroke: #3b82f6;
      stroke-width: 1.5;
      stroke-dasharray: 2 2;
      opacity: 0;
      transition: opacity 0.25s ease;
    }
    body.show-means .mean-marker,
    body.show-means .mean-ring {
      opacity: 1;
    }
    .controls {
      margin-top: 8px;
      display: flex;
      justify-content: center;
      gap: 8px;
    }
    .toggle-btn {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #1e2945;
      padding: 5px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 6px;
      transition: all 0.2s ease;
    }
    .toggle-btn.active {
      background: #eff6ff;
      border-color: #3b82f6;
      color: #1d4ed8;
    }
    .indicator-dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: #94a3b8;
    }
    .toggle-btn.active .indicator-dot {
      background: #3b82f6;
    }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="target-card" onclick="toggleActive(this)">
      <div class="badges">
        <span class="badge badge-high">Acc: High</span>
        <span class="badge badge-high">Prec: High</span>
      </div>
      <div class="svg-wrap">
        <svg viewBox="0 0 120 120">
          <circle cx="60" cy="60" r="54" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="40" fill="#e2e8f0" stroke="#cbd5e1" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="26" fill="#bfdbfe" stroke="#93c5fd" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="12" fill="#fef08a" stroke="#facc15" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="4" fill="#f59e0b"/>
          
          <circle class="dart" cx="59" cy="58" r="3.5"/>
          <circle class="dart" cx="61" cy="62" r="3.5"/>
          <circle class="dart" cx="62" cy="59" r="3.5"/>
          <circle class="dart" cx="58" cy="61" r="3.5"/>
          <circle class="dart" cx="60" cy="60" r="3.5"/>
          
          <circle class="mean-ring" cx="60" cy="60" r="6"/>
          <polygon class="mean-marker" points="60,56 64,60 60,64 56,60"/>
        </svg>
      </div>
    </div>

    
    <div class="target-card" onclick="toggleActive(this)">
      <div class="badges">
        <span class="badge badge-low">Acc: Low</span>
        <span class="badge badge-high">Prec: High</span>
      </div>
      <div class="svg-wrap">
        <svg viewBox="0 0 120 120">
          <circle cx="60" cy="60" r="54" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="40" fill="#e2e8f0" stroke="#cbd5e1" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="26" fill="#bfdbfe" stroke="#93c5fd" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="12" fill="#fef08a" stroke="#facc15" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="4" fill="#f59e0b"/>
          
          <circle class="dart" cx="92" cy="27" r="3.5"/>
          <circle class="dart" cx="95" cy="30" r="3.5"/>
          <circle class="dart" cx="90" cy="32" r="3.5"/>
          <circle class="dart" cx="94" cy="26" r="3.5"/>
          <circle class="dart" cx="89" cy="29" r="3.5"/>
          
          <circle class="mean-ring" cx="92" cy="29" r="6"/>
          <polygon class="mean-marker" points="92,25 96,29 92,33 88,29"/>
        </svg>
      </div>
    </div>

    
    <div class="target-card" onclick="toggleActive(this)">
      <div class="badges">
        <span class="badge badge-high">Acc: High</span>
        <span class="badge badge-low">Prec: Low</span>
      </div>
      <div class="svg-wrap">
        <svg viewBox="0 0 120 120">
          <circle cx="60" cy="60" r="54" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="40" fill="#e2e8f0" stroke="#cbd5e1" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="26" fill="#bfdbfe" stroke="#93c5fd" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="12" fill="#fef08a" stroke="#facc15" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="4" fill="#f59e0b"/>
          
          <circle class="dart" cx="28" cy="40" r="3.5"/>
          <circle class="dart" cx="92" cy="80" r="3.5"/>
          <circle class="dart" cx="42" cy="88" r="3.5"/>
          <circle class="dart" cx="78" cy="32" r="3.5"/>
          <circle class="dart" cx="60" cy="60" r="3.5"/>
          
          <circle class="mean-ring" cx="60" cy="60" r="6"/>
          <polygon class="mean-marker" points="60,56 64,60 60,64 56,60"/>
        </svg>
      </div>
    </div>

    
    <div class="target-card" onclick="toggleActive(this)">
      <div class="badges">
        <span class="badge badge-low">Acc: Low</span>
        <span class="badge badge-low">Prec: Low</span>
      </div>
      <div class="svg-wrap">
        <svg viewBox="0 0 120 120">
          <circle cx="60" cy="60" r="54" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="40" fill="#e2e8f0" stroke="#cbd5e1" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="26" fill="#bfdbfe" stroke="#93c5fd" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="12" fill="#fef08a" stroke="#facc15" stroke-width="1.5"/>
          <circle cx="60" cy="60" r="4" fill="#f59e0b"/>
          
          <circle class="dart" cx="88" cy="25" r="3.5"/>
          <circle class="dart" cx="100" cy="55" r="3.5"/>
          <circle class="dart" cx="75" cy="95" r="3.5"/>
          <circle class="dart" cx="95" cy="82" r="3.5"/>
          <circle class="dart" cx="65" cy="30" r="3.5"/>
          
          <circle class="mean-ring" cx="85" cy="57" r="6"/>
          <polygon class="mean-marker" points="85,53 89,57 85,61 81,57"/>
        </svg>
      </div>
    </div>
  </div>

  <div class="controls">
    <button class="toggle-btn" id="meanToggle" onclick="toggleMean()">
      <span class="indicator-dot"></span>
      <span>Show Average (◆)</span>
    </button>
  </div>

  <script>
    function toggleMean() {
      const isShowing = document.body.classList.toggle('show-means');
      document.getElementById('meanToggle').classList.toggle('active', isShowing);
    }

    function toggleActive(card) {
      document.querySelectorAll('.target-card').forEach(c => {
        if (c !== card) c.classList.remove('active');
      });
      card.classList.toggle('active');
    }
  </script>
</body>
</html>

UK-GCSE-SCIENCE-WS-3-01-07

Aligned learning resources

Related diagrams