<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      background: transparent;
      color: #1e2945;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }
    .grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
      width: 100%;
      max-width: 580px;
    }
    .cup-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px 8px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    }
    .title {
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .cup-svg {
      width: 100%;
      max-width: 110px;
      height: 100px;
      display: block;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-size: 11px;
      font-weight: 800;
      letter-spacing: 0.5px;
      padding: 3px 8px;
      border-radius: 20px;
      margin-top: 6px;
      text-transform: uppercase;
    }
    .badge.soluble {
      background: #dcfce7;
      color: #15803d;
      border: 1px solid #86efac;
    }
    .badge.insoluble {
      background: #fee2e2;
      color: #b91c1c;
      border: 1px solid #fca5a5;
    }
    @media (max-width: 380px) {
      .grid {
        gap: 8px;
      }
      .title {
        font-size: 13px;
      }
      .cup-svg {
        height: 85px;
      }
      .badge {
        font-size: 10px;
        padding: 2px 6px;
      }
    }
  </style>
</head>
<body>
  <div class="grid">
    
    <div class="cup-card">
      <div class="title">🧂 Table Salt</div>
      <svg class="cup-svg" viewBox="0 0 120 110">
        
        <rect x="25" y="15" width="70" height="82" rx="6" fill="#f0f9ff" stroke="#94a3b8" stroke-width="2.5" />
        
        <rect x="27" y="38" width="66" height="57" rx="3" fill="#bae6fd" opacity="0.65" />
        
        <ellipse cx="60" cy="38" rx="33" ry="4" fill="#7dd3fc" />
        
        <circle cx="45" cy="55" r="1.5" fill="#38bdf8" />
        <circle cx="75" cy="68" r="1.5" fill="#38bdf8" />
        <circle cx="58" cy="80" r="1.5" fill="#38bdf8" />
        
        <line x1="32" y1="25" x2="32" y2="88" stroke="#ffffff" stroke-width="2.5" stroke-linecap="round" opacity="0.8" />
      </svg>
      <span class="badge soluble">✓ Soluble</span>
    </div>

    
    <div class="cup-card">
      <div class="title">🌶️ Black Pepper</div>
      <svg class="cup-svg" viewBox="0 0 120 110">
        
        <rect x="25" y="15" width="70" height="82" rx="6" fill="#f0f9ff" stroke="#94a3b8" stroke-width="2.5" />
        
        <rect x="27" y="38" width="66" height="57" rx="3" fill="#bae6fd" opacity="0.65" />
        <ellipse cx="60" cy="38" rx="33" ry="4" fill="#7dd3fc" />
        
        <polygon points="40,36 43,38 41,40 38,38" fill="#1e293b" />
        <polygon points="52,37 55,36 54,39 50,38" fill="#334155" />
        <polygon points="62,38 66,37 64,40 60,39" fill="#0f172a" />
        <polygon points="73,36 77,38 75,41 72,39" fill="#1e293b" />
        <polygon points="82,37 85,39 82,41 80,38" fill="#334155" />
        <circle cx="47" cy="40" r="1.2" fill="#0f172a" />
        <circle cx="68" cy="39" r="1.2" fill="#0f172a" />
        
        <line x1="32" y1="25" x2="32" y2="88" stroke="#ffffff" stroke-width="2.5" stroke-linecap="round" opacity="0.8" />
      </svg>
      <span class="badge insoluble">✗ Insoluble</span>
    </div>

    
    <div class="cup-card">
      <div class="title">🥄 Baking Soda</div>
      <svg class="cup-svg" viewBox="0 0 120 110">
        
        <rect x="25" y="15" width="70" height="82" rx="6" fill="#f0f9ff" stroke="#94a3b8" stroke-width="2.5" />
        
        <rect x="27" y="38" width="66" height="57" rx="3" fill="#bae6fd" opacity="0.65" />
        
        <ellipse cx="60" cy="38" rx="33" ry="4" fill="#7dd3fc" />
        
        <circle cx="42" cy="72" r="1.2" fill="#ffffff" opacity="0.9" />
        <circle cx="70" cy="62" r="1.2" fill="#ffffff" opacity="0.9" />
        <circle cx="56" cy="50" r="1.2" fill="#ffffff" opacity="0.9" />
        
        <line x1="32" y1="25" x2="32" y2="88" stroke="#ffffff" stroke-width="2.5" stroke-linecap="round" opacity="0.8" />
      </svg>
      <span class="badge soluble">✓ Soluble</span>
    </div>

    
    <div class="cup-card">
      <div class="title">🌻 Cooking Oil</div>
      <svg class="cup-svg" viewBox="0 0 120 110">
        
        <rect x="25" y="15" width="70" height="82" rx="6" fill="#f0f9ff" stroke="#94a3b8" stroke-width="2.5" />
        
        <rect x="27" y="52" width="66" height="43" rx="3" fill="#bae6fd" opacity="0.65" />
        
        <rect x="27" y="38" width="66" height="15" fill="#fde047" opacity="0.9" />
        
        <ellipse cx="60" cy="38" rx="33" ry="4" fill="#facc15" />
        
        <ellipse cx="60" cy="53" rx="33" ry="3.5" fill="#eab308" opacity="0.8" />
        
        <line x1="32" y1="25" x2="32" y2="88" stroke="#ffffff" stroke-width="2.5" stroke-linecap="round" opacity="0.8" />
      </svg>
      <span class="badge insoluble">✗ Insoluble</span>
    </div>
  </div>
</body>
</html>

Solubility: Testing Substances That Dissolve in Water

<!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, sans-serif;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 12px;
      gap: 10px;
      user-select: none;
    }

    /* Substance selector buttons */
    .controls {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 6px;
      width: 100%;
      max-width: 480px;
    }
    .test-btn {
      background: #f1f5f9;
      border: 2px solid #e2e8f0;
      border-radius: 20px;
      padding: 6px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: background-color 0.2s, border-color 0.2s, color 0.2s;
    }
    .test-btn.active {
      background: #22b7ff;
      border-color: #0284c7;
      color: #ffffff;
    }

    /* Flowchart Container */
    .flowchart {
      width: 100%;
      max-width: 480px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      position: relative;
    }

    /* Flow Nodes */
    .node {
      border-radius: 10px;
      padding: 8px 12px;
      text-align: center;
      font-size: 13px;
      font-weight: 600;
      transition: background-color 0.3s, border-color 0.3s, box-shadow 0.3s, opacity 0.3s;
      background: #f8fafc;
      border: 2px solid #cbd5e1;
      color: #334155;
    }
    .node.active {
      border-color: #22b7ff;
      background: #e0f2fe;
      color: #0369a1;
      box-shadow: 0 0 0 3px rgba(34, 183, 255, 0.25);
    }

    .start-node {
      display: flex;
      align-items: center;
      gap: 8px;
      width: 85%;
      justify-content: center;
    }

    .arrow-down {
      color: #94a3b8;
      font-size: 14px;
      line-height: 1;
    }
    .arrow-down.active {
      color: #22b7ff;
      font-weight: bold;
    }

    /* Decision Diamond Box */
    .diamond-node {
      background: #fefce8;
      border-color: #fde047;
      color: #854d0e;
      border-radius: 12px;
      width: 90%;
      padding: 8px 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }
    .diamond-node.active {
      background: #fef9c3;
      border-color: #eab308;
      color: #713f12;
      box-shadow: 0 0 0 3px rgba(234, 179, 8, 0.25);
    }

    /* Branches Split */
    .branches {
      display: grid;
      grid-template-columns: 1fr 1.3fr;
      gap: 8px;
      width: 100%;
      margin-top: 2px;
    }

    .branch-col {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
    }

    .branch-tag {
      font-size: 11px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 6px;
    }
    .tag-yes { background: #dcfce7; color: #15803d; }
    .tag-no { background: #fee2e2; color: #b91c1c; }

    /* Result Cards */
    .result-card {
      width: 100%;
      border-radius: 10px;
      padding: 8px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      text-align: center;
      border: 2px solid transparent;
      transition: opacity 0.3s, border-color 0.3s, box-shadow 0.3s;
    }

    .res-soluble {
      background: #f0fdf4;
      border-color: #86efac;
      color: #166534;
      height: 100%;
      justify-content: center;
    }
    .res-soluble.active {
      border-color: #22c55e;
      box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.25);
      background: #dcfce7;
    }

    .res-insoluble-group {
      background: #fff1f2;
      border-color: #fecdd3;
      color: #9f1239;
    }
    .res-insoluble-group.active {
      border-color: #f43f5e;
      box-shadow: 0 0 0 3px rgba(244, 63, 94, 0.25);
    }

    .sub-cases {
      display: flex;
      flex-direction: column;
      gap: 4px;
      width: 100%;
    }
    .sub-item {
      font-size: 11px;
      font-weight: 600;
      padding: 4px 6px;
      background: rgba(255, 255, 255, 0.8);
      border-radius: 6px;
      border: 1px solid #fecdd3;
      color: #881337;
      display: flex;
      align-items: center;
      gap: 4px;
      text-align: left;
      transition: background-color 0.2s, border-color 0.2s;
    }
    .sub-item.active {
      background: #ffe4e6;
      border-color: #e11d48;
      font-weight: 700;
    }

    /* Beaker Visualizer */
    .beaker-icon {
      width: 44px;
      height: 52px;
      border: 3px solid #64748b;
      border-top: none;
      border-radius: 0 0 8px 8px;
      position: relative;
      background: rgba(255, 255, 255, 0.5);
      overflow: hidden;
    }
    .liquid {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 75%;
      background: rgba(34, 183, 255, 0.25);
      border-top: 1px dashed #0284c7;
      transition: background 0.3s;
    }
    .beaker-sand {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 7px;
      background: #d97706;
      border-radius: 0 0 5px 5px;
    }
    .beaker-oil {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 7px;
      background: #facc15;
    }
    .beaker-cloudy {
      background: rgba(203, 213, 225, 0.85) !important;
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <button class="test-btn active" onclick="test('sugar')">🍬 Sugar</button>
    <button class="test-btn" onclick="test('sand')">🏖️ Sand</button>
    <button class="test-btn" onclick="test('oil')">🛢️ Oil</button>
    <button class="test-btn" onclick="test('chalk')">🌫️ Chalk</button>
  </div>

  
  <div class="flowchart">
    
    <div id="step1" class="node start-node active">
      <span>🥄</span>
      <span>1. Stir into water & wait 1 min</span>
    </div>

    <div id="arr1" class="arrow-down active">▼</div>

    
    <div id="step2" class="node diamond-node active">
      <span>🔍</span>
      <span>Liquid is clear & see-through?</span>
    </div>

    
    <div class="branches">
      
      
      <div class="branch-col">
        <div class="branch-tag tag-yes">YES ✓</div>
        <div id="arrYes" class="arrow-down active">▼</div>
        <div id="cardSoluble" class="result-card res-soluble active">
          <div class="beaker-icon">
            <div class="liquid"></div>
          </div>
          <div>
            <div style="font-size: 13px; font-weight: 800;">SOLUBLE</div>
            <div style="font-size: 11px; opacity: 0.85;">Forms solution</div>
          </div>
        </div>
      </div>

      
      <div class="branch-col">
        <div class="branch-tag tag-no">NO ✗</div>
        <div id="arrNo" class="arrow-down">▼</div>
        <div id="cardInsoluble" class="result-card res-insoluble-group">
          
          <div style="font-size: 13px; font-weight: 800;">INSOLUBLE</div>
          
          <div class="sub-cases">
            <div id="subSand" class="sub-item">
              <span>⬇️</span> <span>Settled at bottom</span>
            </div>
            <div id="subOil" class="sub-item">
              <span>⬆️</span> <span>Floating on top</span>
            </div>
            <div id="subChalk" class="sub-item">
              <span>☁️</span> <span>Cloudy throughout</span>
            </div>
          </div>

          <div class="beaker-icon" id="insBeaker" style="margin-top:2px;">
            <div id="insLiquid" class="liquid">
              <div id="insSand" class="beaker-sand" style="display:none;"></div>
              <div id="insOil" class="beaker-oil" style="display:none;"></div>
            </div>
          </div>

        </div>
      </div>

    </div>
  </div>

  <script>
    const substances = {
      sugar: { type: 'soluble', targetSub: null },
      sand:  { type: 'insoluble', targetSub: 'subSand' },
      oil:   { type: 'insoluble', targetSub: 'subOil' },
      chalk: { type: 'insoluble', targetSub: 'subChalk' }
    };

    function test(key) {
      // Toggle buttons
      document.querySelectorAll('.test-btn').forEach(btn => {
        btn.classList.toggle('active', btn.textContent.toLowerCase().includes(key));
      });

      const data = substances[key];
      const isSol = data.type === 'soluble';

      // Arrows
      document.getElementById('arrYes').classList.toggle('active', isSol);
      document.getElementById('arrNo').classList.toggle('active', !isSol);

      // Result Cards
      document.getElementById('cardSoluble').classList.toggle('active', isSol);
      document.getElementById('cardInsoluble').classList.toggle('active', !isSol);

      // Sub items
      ['subSand', 'subOil', 'subChalk'].forEach(id => {
        document.getElementById(id).classList.toggle('active', !isSol && data.targetSub === id);
      });

      // Beaker internal graphics
      const insLiquid = document.getElementById('insLiquid');
      const insSand = document.getElementById('insSand');
      const insOil = document.getElementById('insOil');

      insSand.style.display = key === 'sand' ? 'block' : 'none';
      insOil.style.display = key === 'oil' ? 'block' : 'none';
      insLiquid.classList.toggle('beaker-cloudy', key === 'chalk');
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, sans-serif;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 12px 8px;
      min-height: 100%;
    }

    .controls {
      display: flex;
      background: #f1f5f9;
      padding: 4px;
      border-radius: 999px;
      gap: 4px;
      margin-bottom: 12px;
      border: 1px solid #e2e8f0;
    }

    .btn-toggle {
      border: none;
      background: transparent;
      padding: 6px 16px;
      font-size: 14px;
      font-weight: 600;
      color: #64748b;
      border-radius: 999px;
      cursor: pointer;
      transition: all 0.3s ease;
    }

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

    .beakers-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
      max-width: 480px;
    }

    .beaker-card {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 14px;
      padding: 10px 8px 12px;
    }

    .card-title {
      font-size: 14px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 6px;
    }

    .title-soluble { color: #7c3aed; }
    .title-insoluble { color: #b45309; }

    .svg-container {
      width: 100%;
      max-width: 170px;
      height: auto;
      aspect-ratio: 1 / 1.15;
    }

    .result-badge {
      margin-top: 8px;
      font-size: 13px;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 6px;
      text-align: center;
      transition: all 0.3s ease;
    }

    .badge-soluble {
      background: #ede9fe;
      color: #6d28d9;
    }

    .badge-insoluble {
      background: #fef3c7;
      color: #92400e;
    }

    /* SVG particle transitions */
    .particle {
      transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease;
    }

    .swirl-arrow {
      transition: opacity 0.3s ease;
      opacity: 0;
    }

    .state-stirring .swirl-arrow {
      opacity: 0.6;
    }
  </style>
</head>
<body>

  <div class="controls" role="tablist">
    <button id="btnBefore" class="btn-toggle active" role="tab" aria-selected="true" onclick="setState('before')">Before Stirring</button>
    <button id="btnAfter" class="btn-toggle" role="tab" aria-selected="false" onclick="setState('after')">After Stirring</button>
  </div>

  <div class="beakers-grid">
    
    <div class="beaker-card">
      <div class="card-title title-soluble">Soluble (Sugar)</div>
      <svg class="svg-container" viewBox="0 0 160 180">
        <defs>
          <clipPath id="waterClipLeft">
            <rect x="22" y="45" width="116" height="115" rx="6" />
          </clipPath>
          <linearGradient id="waterGradSoluble" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="#bae6fd" stop-opacity="0.6"/>
            <stop offset="100%" stop-color="#7dd3fc" stop-opacity="0.8"/>
          </linearGradient>
        </defs>

        
        <rect x="20" y="20" width="120" height="145" rx="10" fill="none" stroke="#94a3b8" stroke-width="3"/>
        <path d="M 18 20 L 28 20 M 132 20 L 142 20" stroke="#94a3b8" stroke-width="3" stroke-linecap="round"/>
        <path d="M 140 20 L 148 16" stroke="#94a3b8" stroke-width="2.5" stroke-linecap="round"/>

        
        <rect x="22" y="45" width="116" height="118" rx="8" fill="url(#waterGradSoluble)"/>
        
        <ellipse cx="80" cy="45" rx="58" ry="4" fill="#38bdf8" opacity="0.4"/>

        
        <line x1="22" y1="65" x2="34" y2="65" stroke="#64748b" stroke-width="1.5" stroke-linecap="round"/>
        <line x1="22" y1="95" x2="40" y2="95" stroke="#64748b" stroke-width="1.5" stroke-linecap="round"/>
        <line x1="22" y1="125" x2="34" y2="125" stroke="#64748b" stroke-width="1.5" stroke-linecap="round"/>

        
        <g id="sugarParticles" clip-path="url(#waterClipLeft)"></g>
      </svg>
      <div id="labelSoluble" class="result-badge badge-soluble">Forms a clear solution</div>
    </div>

    
    <div class="beaker-card">
      <div class="card-title title-insoluble">Insoluble (Sand)</div>
      <svg class="svg-container" viewBox="0 0 160 180">
        <defs>
          <clipPath id="waterClipRight">
            <rect x="22" y="45" width="116" height="115" rx="6" />
          </clipPath>
          <linearGradient id="waterGradInsoluble" x1="0" y1="0" x2="0" y2="1">
            <stop offset="0%" stop-color="#bae6fd" stop-opacity="0.6"/>
            <stop offset="100%" stop-color="#7dd3fc" stop-opacity="0.8"/>
          </linearGradient>
        </defs>

        
        <rect x="20" y="20" width="120" height="145" rx="10" fill="none" stroke="#94a3b8" stroke-width="3"/>
        <path d="M 18 20 L 28 20 M 132 20 L 142 20" stroke="#94a3b8" stroke-width="3" stroke-linecap="round"/>
        <path d="M 140 20 L 148 16" stroke="#94a3b8" stroke-width="2.5" stroke-linecap="round"/>

        
        <rect x="22" y="45" width="116" height="118" rx="8" fill="url(#waterGradInsoluble)"/>
        
        <ellipse cx="80" cy="45" rx="58" ry="4" fill="#38bdf8" opacity="0.4"/>

        
        <line x1="22" y1="65" x2="34" y2="65" stroke="#64748b" stroke-width="1.5" stroke-linecap="round"/>
        <line x1="22" y1="95" x2="40" y2="95" stroke="#64748b" stroke-width="1.5" stroke-linecap="round"/>
        <line x1="22" y1="125" x2="34" y2="125" stroke="#64748b" stroke-width="1.5" stroke-linecap="round"/>

        
        <g id="sandParticles" clip-path="url(#waterClipRight)"></g>
      </svg>
      <div id="labelInsoluble" class="result-badge badge-insoluble">Does not dissolve</div>
    </div>
  </div>

  <script>
    // Generate sugar particles with before (pile) and after (dissolved spread) coordinates
    const sugarContainer = document.getElementById('sugarParticles');
    const sandContainer = document.getElementById('sandParticles');

    const sugarPoints = [];
    const numSugar = 28;

    // Fixed random seeds for consistent layout
    for (let i = 0; i < numSugar; i++) {
      // Pile at bottom (x: 55-105, y: 146-158)
      const bx = 60 + Math.random() * 40;
      const by = 148 + Math.random() * 10;
      // Spread evenly in water (x: 32-128, y: 55-155)
      const row = Math.floor(i / 6);
      const col = i % 6;
      const ax = 34 + col * 18 + (Math.random() * 6 - 3);
      const ay = 56 + row * 20 + (Math.random() * 6 - 3);

      sugarPoints.push({ bx, by, ax, ay });

      const circle = document.createElementNS('http://www.w3.org/2000/svg', 'circle');
      circle.setAttribute('class', 'particle sugar-dot');
      circle.setAttribute('r', '2.8');
      circle.setAttribute('fill', '#8b5cf6');
      circle.setAttribute('cx', bx);
      circle.setAttribute('cy', by);
      sugarContainer.appendChild(circle);
    }

    // Generate sand particles (stay in pile, slight settle/jiggle on stir)
    const sandPoints = [];
    const numSand = 34;
    for (let i = 0; i < numSand; i++) {
      const bx = 52 + Math.random() * 56;
      const by = 144 + Math.random() * 14;
      sandPoints.push({ bx, by });

      const circle = document.createElementNS('http://www.w3.org/2000/svg', 'circle');
      circle.setAttribute('class', 'particle sand-dot');
      circle.setAttribute('r', (2.2 + Math.random() * 1.2).toFixed(1));
      circle.setAttribute('fill', i % 2 === 0 ? '#92400e' : '#b45309');
      circle.setAttribute('cx', bx);
      circle.setAttribute('cy', by);
      sandContainer.appendChild(circle);
    }

    function setState(state) {
      const isAfter = state === 'after';
      
      document.getElementById('btnBefore').classList.toggle('active', !isAfter);
      document.getElementById('btnAfter').classList.toggle('active', isAfter);
      document.getElementById('btnBefore').setAttribute('aria-selected', !isAfter);
      document.getElementById('btnAfter').setAttribute('aria-selected', isAfter);

      // Animate Sugar Particles
      const sugarDots = sugarContainer.querySelectorAll('.sugar-dot');
      sugarDots.forEach((dot, idx) => {
        const pt = sugarPoints[idx];
        if (isAfter) {
          dot.setAttribute('cx', pt.ax);
          dot.setAttribute('cy', pt.ay);
          dot.setAttribute('fill', '#9333ea');
          dot.setAttribute('opacity', '0.75');
        } else {
          dot.setAttribute('cx', pt.bx);
          dot.setAttribute('cy', pt.by);
          dot.setAttribute('fill', '#8b5cf6');
          dot.setAttribute('opacity', '1');
        }
      });

      // Update Labels
      document.getElementById('labelSoluble').textContent = isAfter ? 'Forms a clear solution' : 'Sugar at bottom';
      document.getElementById('labelInsoluble').textContent = isAfter ? 'Does not dissolve' : 'Sand at bottom';
    }

    // Initialize to 'before' state
    setState('before');
  </script>
</body>
</html>

science.ks3.y1.t3.s2

Aligned learning resources

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