<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Bunsen Burner Interactive Diagram</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;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      gap: 10px;
      min-height: auto;
      padding: 12px 10px;
      user-select: none;
    }

    /* Safe Lighting Order Bar */
    .steps-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      width: 100%;
      max-width: 440px;
      gap: 6px;
    }
    .step-badge {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 5px 3px;
      font-size: 10.5px;
      font-weight: 600;
      text-align: center;
      color: #475569;
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      line-height: 1.2;
    }
    .step-badge span {
      font-size: 9px;
      font-weight: 700;
      color: #0284c7;
      text-transform: uppercase;
      letter-spacing: 0.3px;
    }

    /* Main Burner Stage */
    .burner-stage {
      position: relative;
      width: 100%;
      max-width: 440px;
      height: 245px;
      display: flex;
      justify-content: center;
      align-items: center;
    }

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

    /* Flame Animations - Gentle and Calm (>=1.5s) to eliminate flicker */
    @keyframes waveFlame {
      0%, 100% { transform: scaleX(1) skewX(0deg) scaleY(1); }
      33% { transform: scaleX(1.04) skewX(1.8deg) scaleY(1.02); }
      66% { transform: scaleX(0.96) skewX(-1.5deg) scaleY(0.98); }
    }
    @keyframes hissFlame {
      0%, 100% { transform: scaleY(1) scaleX(1); }
      50% { transform: scaleY(1.025) scaleX(0.985); }
    }

    .flame-yellow {
      transform-origin: 210px 140px;
      animation: waveFlame 2.4s ease-in-out infinite;
      transition: opacity 0.25s ease;
    }
    .flame-blue {
      transform-origin: 210px 140px;
      animation: hissFlame 1.8s ease-in-out infinite;
      transition: opacity 0.25s ease;
    }

    /* Controls Panel */
    .controls-panel {
      width: 100%;
      max-width: 440px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      padding: 10px 14px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .slider-labels {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 11.5px;
      font-weight: 600;
    }
    .lbl-safety { color: #d97706; }
    .lbl-heating { color: #0284c7; }

    .slider-row {
      display: flex;
      align-items: center;
      width: 100%;
    }
    input[type=range] {
      width: 100%;
      accent-color: #0284c7;
      cursor: pointer;
      height: 6px;
    }

    /* SVG text and labels */
    .svg-lbl {
      font-size: 11px;
      font-weight: 600;
      fill: #475569;
      font-family: inherit;
    }
    .temp-lbl-yellow {
      fill: #b45309;
      font-weight: 700;
      font-size: 11.5px;
      font-family: inherit;
    }
    .temp-lbl-blue {
      fill: #0369a1;
      font-weight: 700;
      font-size: 11.5px;
      font-family: inherit;
    }

    @media (max-width: 380px) {
      .step-badge {
        font-size: 9.5px;
        padding: 4px 2px;
      }
      .slider-labels {
        font-size: 10.5px;
      }
    }
  </style>
</head>
<body>

  
  <div class="steps-bar">
    <div class="step-badge"><span>Step 1</span>1. Close collar</div>
    <div class="step-badge"><span>Step 2</span>2. Light match</div>
    <div class="step-badge"><span>Step 3</span>3. Gas on</div>
    <div class="step-badge"><span>Step 4</span>4. Open collar</div>
  </div>

  
  <div class="burner-stage">
    <svg viewBox="0 0 420 245" preserveAspectRatio="xMidYMid meet">
      <defs>
        
        <linearGradient id="metal" x1="0" y1="0" x2="1" y2="0">
          <stop offset="0%" stop-color="#94a3b8"/>
          <stop offset="40%" stop-color="#cbd5e1"/>
          <stop offset="100%" stop-color="#64748b"/>
        </linearGradient>
        <linearGradient id="brass" x1="0" y1="0" x2="1" y2="0">
          <stop offset="0%" stop-color="#d97706"/>
          <stop offset="50%" stop-color="#fde68a"/>
          <stop offset="100%" stop-color="#b45309"/>
        </linearGradient>
        <radialGradient id="gradYellow" cx="50%" cy="80%" r="60%">
          <stop offset="0%" stop-color="#fffbeb"/>
          <stop offset="40%" stop-color="#f59e0b"/>
          <stop offset="90%" stop-color="#ea580c"/>
          <stop offset="100%" stop-color="rgba(234,88,12,0)"/>
        </radialGradient>
        <radialGradient id="gradBlueOuter" cx="50%" cy="80%" r="70%">
          <stop offset="0%" stop-color="rgba(186,230,253,0.85)"/>
          <stop offset="70%" stop-color="rgba(56,189,248,0.7)"/>
          <stop offset="100%" stop-color="rgba(2,132,199,0)"/>
        </radialGradient>
        <radialGradient id="gradBlueInner" cx="50%" cy="85%" r="60%">
          <stop offset="0%" stop-color="#ffffff"/>
          <stop offset="50%" stop-color="#38bdf8"/>
          <stop offset="100%" stop-color="#0284c7"/>
        </radialGradient>
      </defs>

      
      <g id="yellowFlameGroup" class="flame-yellow">
        <path d="M 197 140 C 185 90 190 45 210 12 C 230 45 235 90 223 140 Z" fill="url(#gradYellow)"/>
        
        <path d="M 225 50 L 265 35" stroke="#d97706" stroke-width="1.5" stroke-dasharray="3,2" fill="none"/>
        <circle cx="225" cy="50" r="3" fill="#d97706"/>
        <text x="272" y="32" class="temp-lbl-yellow">Luminous Flame (~300°C)</text>
        <text x="272" y="47" class="svg-lbl">Safety • Sooty • Visible</text>
      </g>

      
      <g id="blueFlameGroup" class="flame-blue" style="opacity: 0;">
        
        <path d="M 198 140 C 190 100 196 60 210 40 C 224 60 230 100 222 140 Z" fill="url(#gradBlueOuter)"/>
        
        <path d="M 201 140 C 198 120 202 95 210 88 C 218 95 222 120 219 140 Z" fill="url(#gradBlueInner)"/>
        
        <circle cx="210" cy="84" r="3.5" fill="#0284c7"/>
        <path d="M 210 84 L 265 72" stroke="#0284c7" stroke-width="1.5" fill="none"/>
        <text x="272" y="69" class="temp-lbl-blue">Hottest Point (~1500°C)</text>
        <text x="272" y="84" class="svg-lbl">Tip of inner blue cone</text>
      </g>

      
      
      <path d="M 140 215 L 195 215" stroke="url(#metal)" stroke-width="10" stroke-linecap="round"/>
      <path d="M 135 215 L 142 215" stroke="#64748b" stroke-width="12" stroke-linecap="round"/>
      <text x="95" y="219" class="svg-lbl" text-anchor="middle">Gas inlet</text>
      <path d="M 130 215 L 155 215" stroke="#94a3b8" stroke-width="1" stroke-dasharray="2,2"/>

      
      <ellipse cx="210" cy="235" rx="55" ry="10" fill="url(#metal)"/>
      <ellipse cx="210" cy="233" rx="46" ry="7" fill="#475569"/>

      
      <rect x="200" y="140" width="20" height="78" fill="url(#metal)" rx="1"/>
      <line x1="200" y1="140" x2="220" y2="140" stroke="#475569" stroke-width="2"/>

      
      <rect x="198" y="196" width="24" height="20" fill="url(#brass)" rx="2"/>
      
      <ellipse id="airHole" cx="210" cy="206" rx="0.5" ry="6" fill="#1e293b"/>

      
      <text x="285" y="165" class="svg-lbl">Barrel</text>
      <path d="M 278 162 L 222 155" stroke="#94a3b8" stroke-width="1.2" fill="none"/>

      <text x="285" y="208" class="svg-lbl">Air collar</text>
      <path d="M 278 205 L 224 205" stroke="#94a3b8" stroke-width="1.2" fill="none"/>
    </svg>
  </div>

  
  <div class="controls-panel">
    <div class="slider-labels">
      <span class="lbl-safety">◀ Closed (Safety)</span>
      <span id="collarState" style="color: #d97706; font-weight:700;">Collar: Closed (Safety)</span>
      <span class="lbl-heating">Open (Heating) ▶</span>
    </div>
    <div class="slider-row">
      <input type="range" id="collarSlider" min="0" max="100" value="0" step="1" aria-label="Air collar control slider">
    </div>
  </div>

  <script>
    const slider = document.getElementById('collarSlider');
    const airHole = document.getElementById('airHole');
    const yellowFlame = document.getElementById('yellowFlameGroup');
    const blueFlame = document.getElementById('blueFlameGroup');
    const collarState = document.getElementById('collarState');

    function updateState(val) {
      const pct = val / 100;
      
      // Update Air Hole aperture width smoothly
      airHole.setAttribute('rx', (0.5 + pct * 4.5).toFixed(1));

      // Transition flame opacities
      yellowFlame.style.opacity = (1 - pct).toFixed(2);
      blueFlame.style.opacity = pct.toFixed(2);

      // Label updates
      if (val === 0) {
        collarState.textContent = 'Collar: Closed (Safety)';
        collarState.style.color = '#d97706';
      } else if (val === 100) {
        collarState.textContent = 'Collar: Fully Open (Heating)';
        collarState.style.color = '#0284c7';
      } else {
        collarState.textContent = `Collar: ${val}% Open`;
        collarState.style.color = '#475569';
      }
    }

    slider.addEventListener('input', (e) => {
      updateState(parseInt(e.target.value, 10));
    });

    updateState(0);
  </script>
</body>
</html>

Using Lab Tools and Instruments Safely

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Laboratory Tool Safety: Balance & Centrifuge</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: #0f172a;
      padding: 16px;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      gap: 16px;
    }

    .header-banner {
      text-align: center;
      padding-bottom: 4px;
    }

    .header-banner h1 {
      font-size: 17px;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.01em;
    }

    .header-banner p {
      font-size: 12px;
      color: #334155;
      margin-top: 2px;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 16px;
      width: 100%;
      max-width: 860px;
      margin: 0 auto;
      flex: 1;
    }

    .tool-card {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 12px;
      padding: 16px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
      position: relative;
    }

    .tool-header {
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
    }

    .tool-title {
      font-size: 14px;
      font-weight: 800;
      color: #0f172a;
      text-transform: uppercase;
      letter-spacing: 0.6px;
    }

    .toggle-group {
      display: flex;
      background: #e2e8f0;
      border-radius: 20px;
      padding: 3px;
      gap: 2px;
    }

    .toggle-btn {
      border: none;
      background: transparent;
      padding: 5px 14px;
      font-size: 12px;
      font-weight: 700;
      color: #334155;
      border-radius: 16px;
      cursor: pointer;
      transition: background 0.25s ease, color 0.25s ease, box-shadow 0.25s ease;
    }

    .toggle-btn.active {
      background: #ffffff;
      color: #0369a1;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
    }

    .toggle-btn.active.danger {
      background: #ffffff;
      color: #b91c1c;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
    }

    /* Stage Containers */
    .stage {
      width: 100%;
      height: 190px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: #f1f5f9;
      border-radius: 8px;
      border: 1px dashed #cbd5e1;
      margin: 8px 0;
      overflow: hidden;
    }

    /* Balance Graphic */
    .balance-box {
      width: 150px;
      height: 175px;
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-end;
      padding-bottom: 6px;
    }

    .draft-shield {
      width: 120px;
      height: 110px;
      border: 2px solid #64748b;
      border-bottom: none;
      background: rgba(240, 249, 255, 0.7);
      border-radius: 6px 6px 0 0;
      position: relative;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-end;
      box-shadow: inset 0 0 8px rgba(186, 230, 253, 0.4);
    }

    .shield-label {
      position: absolute;
      top: 3px;
      left: 6px;
      font-size: 8px;
      font-weight: 700;
      color: #64748b;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .flask-svg-wrap {
      width: 44px;
      height: 52px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 2px;
      transition: filter 0.4s ease;
      position: relative;
      z-index: 2;
    }

    .flask-svg {
      width: 100%;
      height: 100%;
    }

    .flask-svg-wrap.hot {
      filter: drop-shadow(0 0 6px rgba(239, 68, 68, 0.85));
    }

    .pan {
      width: 70px;
      height: 4px;
      background: #475569;
      border-radius: 2px;
      position: relative;
      z-index: 2;
    }

    .pan-stem {
      width: 6px;
      height: 7px;
      background: #64748b;
      margin: 0 auto;
    }

    .base {
      width: 136px;
      height: 44px;
      background: #e2e8f0;
      border: 2px solid #94a3b8;
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
    }

    .screen {
      background: #090d16;
      color: #38bdf8;
      font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', monospace;
      font-size: 13px;
      font-weight: 700;
      padding: 4px 8px;
      border-radius: 3px;
      letter-spacing: 1px;
      min-width: 105px;
      text-align: right;
      border: 1px solid #1e293b;
      transition: color 0.3s ease;
    }

    .screen.unstable {
      color: #f87171;
    }

    /* Thermal Currents */
    .convection-svg {
      position: absolute;
      top: 6px;
      width: 100px;
      height: 85px;
      pointer-events: none;
      opacity: 0;
      transition: opacity 0.4s ease;
      z-index: 3;
    }

    .convection-svg.visible {
      opacity: 1;
    }

    .draft-line {
      stroke: #dc2626;
      stroke-width: 2.2;
      stroke-dasharray: 6 4;
      fill: none;
      stroke-linecap: round;
      animation: rise 1.8s linear infinite;
    }

    @keyframes rise {
      0% { stroke-dashoffset: 20; }
      100% { stroke-dashoffset: 0; }
    }

    /* Centrifuge Graphic */
    .centrifuge-chamber {
      width: 154px;
      height: 154px;
      background: #cbd5e1;
      border: 3px solid #94a3b8;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.2);
    }

    .rotor-wrapper {
      position: relative;
      width: 134px;
      height: 134px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .rotor {
      width: 124px;
      height: 124px;
      background: #e2e8f0;
      border: 2px solid #64748b;
      border-radius: 50%;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
    }

    .rotor.spin-stable {
      animation: spin 2.2s linear infinite;
    }

    .rotor.spin-wobble {
      animation: wobbleSpin 0.9s ease-in-out infinite;
    }

    @keyframes spin {
      100% { transform: rotate(360deg); }
    }

    @keyframes wobbleSpin {
      0% { transform: translate(-3px, 2px) rotate(0deg); }
      25% { transform: translate(3px, -2px) rotate(90deg); }
      50% { transform: translate(-2px, -3px) rotate(180deg); }
      75% { transform: translate(2px, 3px) rotate(270deg); }
      100% { transform: translate(-3px, 2px) rotate(360deg); }
    }

    .spindle {
      width: 22px;
      height: 22px;
      background: #334155;
      border-radius: 50%;
      border: 2px solid #94a3b8;
      z-index: 3;
      box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.4);
    }

    .tube-slot {
      position: absolute;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: #94a3b8;
      border: 1px solid #64748b;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .tube {
      width: 18px;
      height: 18px;
      border-radius: 50%;
      background: #0284c7;
      border: 2px solid #ffffff;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
      position: relative;
    }

    .tube::after {
      content: '';
      position: absolute;
      top: 2px;
      left: 2px;
      width: 4px;
      height: 4px;
      background: rgba(255, 255, 255, 0.7);
      border-radius: 50%;
    }

    /* Slot Positions (6-place rotor) */
    .slot-0 { transform: rotate(0deg) translate(44px) rotate(0deg); }
    .slot-1 { transform: rotate(60deg) translate(44px) rotate(-60deg); }
    .slot-2 { transform: rotate(120deg) translate(44px) rotate(-120deg); }
    .slot-3 { transform: rotate(180deg) translate(44px) rotate(-180deg); }
    .slot-4 { transform: rotate(240deg) translate(44px) rotate(-240deg); }
    .slot-5 { transform: rotate(300deg) translate(44px) rotate(-300deg); }

    /* Badges & Explanations */
    .status-badge {
      font-size: 12px;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 20px;
      display: inline-flex;
      align-items: center;
      gap: 5px;
      margin-bottom: 6px;
    }

    .status-badge.ok {
      background: #dcfce7;
      color: #166534;
      border: 1px solid #bbf7d0;
    }

    .status-badge.err {
      background: #fee2e2;
      color: #991b1b;
      border: 1px solid #fecaca;
    }

    .info-desc {
      font-size: 11.5px;
      line-height: 1.4;
      color: #334155;
      text-align: center;
      min-height: 34px;
    }

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

    @media (max-width: 600px) {
      body {
        padding: 10px;
        gap: 10px;
      }
      .grid {
        grid-template-columns: 1fr;
      }
      .stage {
        height: 170px;
      }
    }
  </style>
</head>
<body>

  <header class="header-banner">
    <h1>Precision Lab Tool Safety Procedures</h1>
    <p>Compare correct operational balance and symmetry requirements</p>
  </header>

  <main class="grid">
    
    <article class="tool-card">
      <div class="tool-header">
        <h2 class="tool-title">Analytical Balance</h2>
        <div class="toggle-group" role="group" aria-label="Sample Temperature">
          <button type="button" class="toggle-btn active" id="btnTare" onclick="setBalance(false)">Room Temp</button>
          <button type="button" class="toggle-btn danger" id="btnHot" onclick="setBalance(true)">Hot Flask</button>
        </div>
      </div>

      <div class="stage" aria-live="polite">
        <div class="balance-box">
          
          <svg class="convection-svg" id="thermalDraft" viewBox="0 0 100 85" fill="none">
            <path class="draft-line" d="M25,75 Q15,40 30,10" />
            <path class="draft-line" d="M50,70 Q65,40 50,8" />
            <path class="draft-line" d="M75,75 Q85,40 70,10" />
            <polygon points="30,8 26,16 35,14" fill="#dc2626" />
            <polygon points="50,6 46,14 55,14" fill="#dc2626" />
            <polygon points="70,8 65,14 74,16" fill="#dc2626" />
          </svg>
          
          <div class="draft-shield">
            <span class="shield-label">Glass Enclosure</span>
            
            
            <div class="flask-svg-wrap" id="flaskIcon">
              <svg class="flask-svg" viewBox="0 0 44 52" fill="none" xmlns="http://www.w3.org/2000/svg">
                
                <rect x="17" y="4" width="10" height="4" rx="1.5" fill="#94a3b8" />
                <path d="M19 8V20L7 44C5.5 47 7.7 50 11 50H33C36.3 50 38.5 47 37 44L25 20V8H19Z" 
                      fill="#e0f2fe" stroke="#334155" stroke-width="2.2" stroke-linejoin="round" />
                
                <path d="M11 44L17 32H27L33 44C34.5 47 32.5 48 30 48H14C11.5 48 9.5 47 11 44Z" 
                      id="flaskLiquid" fill="#38bdf8" fill-opacity="0.75" />
                
                <line x1="16" y1="36" x2="21" y2="36" stroke="#475569" stroke-width="1.5" stroke-linecap="round" />
                <line x1="18" y1="41" x2="24" y2="41" stroke="#475569" stroke-width="1.5" stroke-linecap="round" />
              </svg>
            </div>

            <div class="pan"></div>
            <div class="pan-stem"></div>
          </div>
          
          <div class="base">
            <div class="screen" id="balanceScreen" aria-label="Balance reading">0.0000 g</div>
          </div>
        </div>
      </div>

      <div class="status-badge ok" id="balanceStatus">✓ Zero Tare (Stable)</div>
      <p class="info-desc" id="balanceDesc">
        <strong>Draft Shield Closed:</strong> Enclosure isolates convective air currents for stable 4-decimal accuracy.
      </p>
    </article>

    
    <article class="tool-card">
      <div class="tool-header">
        <h2 class="tool-title">Centrifuge Rotor</h2>
        <div class="toggle-group" role="group" aria-label="Rotor Balancing">
          <button type="button" class="toggle-btn active" id="btnBalanced" onclick="setCentrifuge(true)">Balanced</button>
          <button type="button" class="toggle-btn danger" id="btnUnbalanced" onclick="setCentrifuge(false)">Unbalanced</button>
        </div>
      </div>

      <div class="stage" aria-live="polite">
        <div class="centrifuge-chamber">
          <div class="rotor-wrapper">
            <div class="rotor spin-stable" id="rotor">
              <div class="spindle"></div>
              <div class="tube-slot slot-0" title="Tube 1"><div class="tube"></div></div>
              <div class="tube-slot slot-1" title="Slot 2"></div>
              <div class="tube-slot slot-2" title="Slot 3"></div>
              <div class="tube-slot slot-3" id="opposingTube" title="Tube 2 (Opposing)"><div class="tube"></div></div>
              <div class="tube-slot slot-4" title="Slot 5"></div>
              <div class="tube-slot slot-5" title="Slot 6"></div>
            </div>
          </div>
        </div>
      </div>

      <div class="status-badge ok" id="centrifugeStatus">✓ Balanced (180° Symmetry)</div>
      <p class="info-desc" id="centrifugeDesc">
        <strong>Equal Opposing Mass:</strong> Tubes placed directly opposite neutralize centrifugal forces and protect spindle bearings.
      </p>
    </article>
  </main>

  <script>
    let balInterval = null;

    function setBalance(isHot) {
      const btnTare = document.getElementById('btnTare');
      const btnHot = document.getElementById('btnHot');
      btnTare.classList.toggle('active', !isHot);
      btnHot.classList.toggle('active', isHot);
      
      const flask = document.getElementById('flaskIcon');
      const liquid = document.getElementById('flaskLiquid');
      const draft = document.getElementById('thermalDraft');
      const screen = document.getElementById('balanceScreen');
      const status = document.getElementById('balanceStatus');
      const desc = document.getElementById('balanceDesc');

      if (balInterval) {
        clearInterval(balInterval);
        balInterval = null;
      }

      if (isHot) {
        flask.classList.add('hot');
        liquid.setAttribute('fill', '#f87171');
        draft.classList.add('visible');
        screen.classList.add('unstable');
        status.className = 'status-badge err';
        status.textContent = '⚠️ Thermal Buoyancy & Drift';
        desc.innerHTML = '<strong>Hazard:</strong> Hot vessels heat internal air, creating upward convective draft currents and false lower mass.';

        balInterval = setInterval(() => {
          const drift = (24.7800 + (Math.random() * 0.05 - 0.025)).toFixed(4);
          screen.textContent = drift + ' g';
        }, 800);
      } else {
        flask.classList.remove('hot');
        liquid.setAttribute('fill', '#38bdf8');
        draft.classList.remove('visible');
        screen.classList.remove('unstable');
        screen.textContent = '0.0000 g';
        status.className = 'status-badge ok';
        status.textContent = '✓ Zero Tare (Stable)';
        desc.innerHTML = '<strong>Draft Shield Closed:</strong> Enclosure isolates convective air currents for stable 4-decimal accuracy.';
      }
    }

    function setCentrifuge(isBalanced) {
      const btnBalanced = document.getElementById('btnBalanced');
      const btnUnbalanced = document.getElementById('btnUnbalanced');
      btnBalanced.classList.toggle('active', isBalanced);
      btnUnbalanced.classList.toggle('active', !isBalanced);

      const rotor = document.getElementById('rotor');
      const oppTube = document.getElementById('opposingTube');
      const status = document.getElementById('centrifugeStatus');
      const desc = document.getElementById('centrifugeDesc');

      if (isBalanced) {
        oppTube.innerHTML = '<div class="tube"></div>';
        rotor.className = 'rotor spin-stable';
        status.className = 'status-badge ok';
        status.textContent = '✓ Balanced (180° Symmetry)';
        desc.innerHTML = '<strong>Equal Opposing Mass:</strong> Tubes placed directly opposite neutralize centrifugal forces and protect spindle bearings.';
      } else {
        oppTube.innerHTML = '';
        rotor.className = 'rotor spin-wobble';
        status.className = 'status-badge err';
        status.textContent = '⚠️ Rotor Wobble & Wear';
        desc.innerHTML = '<strong>Critical Risk:</strong> Asymmetrical loading generates violent harmonic oscillations, risking rotor failure and motor damage.';
      }
    }
  </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: #f8fafc;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
      padding: 12px;
      user-select: none;
    }

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

    .btn-test {
      background: #0284c7;
      color: #fff;
      border: none;
      border-radius: 6px;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    }
    .btn-test:active {
      background: #0369a1;
    }

    .diagram-svg {
      width: 100%;
      max-width: 640px;
      height: auto;
      display: block;
    }

    /* Flow Animations */
    .flow-normal {
      stroke-dasharray: 8 8;
      animation: flowCW 2s linear infinite;
    }

    .flow-surge {
      stroke-dasharray: 6 6;
      animation: flowSurge 0.4s linear infinite;
    }

    @keyframes flowCW {
      to { stroke-dashoffset: -32; }
    }
    @keyframes flowSurge {
      to { stroke-dashoffset: -36; }
    }

    /* Blown State Classes */
    .blown-hide { transition: opacity 0.3s; }
    .is-blown .blown-hide { opacity: 0; }
    .blown-show { opacity: 0; transition: opacity 0.3s; }
    .is-blown .blown-show { opacity: 1; }
    
    .spark {
      transform-origin: center;
      animation: pop 0.4s ease-out forwards;
    }
    @keyframes pop {
      0% { transform: scale(0.2); opacity: 0; }
      50% { transform: scale(1.4); opacity: 1; }
      100% { transform: scale(1); opacity: 1; }
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <div style="font-size: 13px; font-weight: 700; color: #64748b; letter-spacing: 0.5px;">AMMETER WIRING SAFETY</div>
    <button id="btnAction" class="btn-test" onclick="triggerTest()">
      <span id="btnIcon">⚡</span> <span id="btnText">Test Fault</span>
    </button>
  </div>

  <svg class="diagram-svg" viewBox="0 0 600 360" id="circuitSvg">
    <defs>
      
      <filter id="glow-bulb" x="-30%" y="-30%" width="160%" height="160%">
        <feGaussianBlur stdDeviation="6" result="blur" />
        <feComposite in="SourceGraphic" in2="blur" operator="over" />
      </filter>
      <filter id="glow-spark" x="-50%" y="-50%" width="200%" height="200%">
        <feGaussianBlur stdDeviation="4" result="blur" />
        <feComposite in="SourceGraphic" in2="blur" operator="over" />
      </filter>
    </defs>

    
    <g transform="translate(10, 0)">
      
      <rect x="10" y="10" width="260" height="28" rx="6" fill="#ecfdf5" stroke="#a7f3d0" stroke-width="1.5"/>
      <text x="140" y="29" font-size="13" font-weight="700" fill="#059669" text-anchor="middle">✓ CORRECT: Series Loop</text>

      
      <rect x="40" y="70" width="200" height="210" rx="14" fill="none" stroke="#cbd5e1" stroke-width="6"/>
      
      <rect x="40" y="70" width="200" height="210" rx="14" fill="none" stroke="#10b981" stroke-width="3" class="flow-normal"/>

      
      <g transform="translate(40, 175)">
        <rect x="-18" y="-28" width="36" height="56" rx="4" fill="#334155"/>
        <rect x="-10" y="-34" width="20" height="6" rx="2" fill="#94a3b8"/>
        <text x="0" y="4" font-size="11" font-weight="800" fill="#f8fafc" text-anchor="middle">9V</text>
        <text x="0" y="-14" font-size="12" font-weight="900" fill="#38bdf8" text-anchor="middle">+</text>
        <text x="0" y="20" font-size="14" font-weight="900" fill="#94a3b8" text-anchor="middle">−</text>
      </g>

      
      <g transform="translate(140, 70)">
        <rect x="-44" y="-22" width="88" height="44" rx="6" fill="#0284c7" stroke="#0369a1" stroke-width="2"/>
        <rect x="-36" y="-16" width="72" height="22" rx="3" fill="#0f172a"/>
        <text x="0" y="0" font-family="monospace" font-size="14" font-weight="700" fill="#38bdf8" text-anchor="middle">0.25 A</text>
        <text x="0" y="16" font-size="9" font-weight="700" fill="#e0f2fe" text-anchor="middle">AMMETER</text>
      </g>

      
      <g transform="translate(140, 280)">
        <circle cx="0" cy="0" r="22" fill="#fef08a" filter="url(#glow-bulb)" opacity="0.6"/>
        <circle cx="0" cy="0" r="16" fill="#fef9c3" stroke="#eab308" stroke-width="2"/>
        <text x="0" y="6" font-size="18" text-anchor="middle">💡</text>
        <text x="0" y="32" font-size="11" font-weight="700" fill="#475569" text-anchor="middle">Bulb Lit (Safe)</text>
      </g>
    </g>

    
    <line x1="300" y1="20" x2="300" y2="330" stroke="#e2e8f0" stroke-width="1.5" stroke-dasharray="4 4"/>

    
    <g transform="translate(310, 0)" id="dangerSide">
      
      <rect x="10" y="10" width="260" height="28" rx="6" fill="#fef2f2" stroke="#fecaca" stroke-width="1.5"/>
      <text x="140" y="29" font-size="13" font-weight="700" fill="#dc2626" text-anchor="middle">⚠ DANGER: Parallel Fault</text>

      
      <rect x="40" y="70" width="200" height="210" rx="14" fill="none" stroke="#cbd5e1" stroke-width="6"/>

      
      <line x1="140" y1="70" x2="140" y2="280" stroke="#cbd5e1" stroke-width="6"/>

      
      <path d="M 40,175 L 40,70 L 140,70 L 140,280 L 40,280 Z" fill="none" stroke="#ef4444" stroke-width="4" class="flow-surge blown-hide"/>

      
      <g transform="translate(40, 175)">
        <rect x="-18" y="-28" width="36" height="56" rx="4" fill="#334155"/>
        <rect x="-10" y="-34" width="20" height="6" rx="2" fill="#94a3b8"/>
        <text x="0" y="4" font-size="11" font-weight="800" fill="#f8fafc" text-anchor="middle">9V</text>
        <text x="0" y="-14" font-size="12" font-weight="900" fill="#38bdf8" text-anchor="middle">+</text>
        <text x="0" y="20" font-size="14" font-weight="900" fill="#94a3b8" text-anchor="middle">−</text>
      </g>

      
      <g transform="translate(240, 175)">
        <circle cx="0" cy="0" r="16" fill="#f1f5f9" stroke="#94a3b8" stroke-width="2"/>
        <text x="0" y="6" font-size="16" opacity="0.4" text-anchor="middle">💡</text>
        <text x="0" y="32" font-size="10" font-weight="600" fill="#94a3b8" text-anchor="middle">0 A (Bypassed)</text>
      </g>

      
      <g transform="translate(140, 175)">
        
        <rect x="-46" y="-36" width="92" height="72" rx="8" fill="#e11d48" stroke="#9f1239" stroke-width="2"/>
        
        
        <g class="blown-hide">
          <rect x="-38" y="-28" width="76" height="22" rx="3" fill="#0f172a"/>
          <text x="0" y="-12" font-family="monospace" font-size="12" font-weight="700" fill="#f87171" text-anchor="middle">SURGE &gt;20A</text>
          
          <line x1="-24" y1="12" x2="24" y2="12" stroke="#fecdd3" stroke-width="3"/>
          <text x="0" y="26" font-size="8" font-weight="700" fill="#ffe4e6" text-anchor="middle">R_shunt ≈ 0 Ω</text>
        </g>

        
        <g class="blown-show">
          <rect x="-38" y="-28" width="76" height="22" rx="3" fill="#450a0a"/>
          <text x="0" y="-12" font-family="monospace" font-size="13" font-weight="800" fill="#fca5a5" text-anchor="middle">O.L. (OPEN)</text>
          
          
          <line x1="-24" y1="12" x2="-8" y2="12" stroke="#64748b" stroke-width="3"/>
          <line x1="8" y1="12" x2="24" y2="12" stroke="#64748b" stroke-width="3"/>
          
          
          <path d="M 0,4 L 3,9 L 8,7 L 5,12 L 9,15 L 3,16 L 0,21 L -3,16 L -9,15 L -5,12 L -8,7 L -3,9 Z" fill="#fbbf24" stroke="#dc2626" stroke-width="1" class="spark" filter="url(#glow-spark)"/>
        </g>
      </g>

      
      <g transform="translate(140, 310)">
        <g class="blown-show">
          <rect x="-85" y="-14" width="170" height="26" rx="6" fill="#fee2e2" stroke="#ef4444" stroke-width="1.5"/>
          <text x="0" y="4" font-size="11" font-weight="800" fill="#b91c1c" text-anchor="middle">💥 FUSE BLOWN (0 Ω Short)</text>
        </g>
        <g class="blown-hide">
          <rect x="-70" y="-14" width="140" height="24" rx="5" fill="#fef3c7" stroke="#f59e0b" stroke-width="1"/>
          <text x="0" y="3" font-size="10" font-weight="700" fill="#b45309" text-anchor="middle">Dead Short Hazard</text>
        </g>
      </g>
    </g>
  </svg>

  <script>
    let isBlown = false;

    // Audio synthesizer for educational feedback on direct user interaction
    function playFx(freq, type, duration) {
      try {
        const ctx = new (window.AudioContext || window.webkitAudioContext)();
        const osc = ctx.createOscillator();
        const gain = ctx.createGain();
        osc.type = type || 'sine';
        osc.frequency.setValueAtTime(freq, ctx.currentTime);
        if (type === 'sawtooth') {
          osc.frequency.exponentialRampToValueAtTime(80, ctx.currentTime + duration);
        }
        gain.gain.setValueAtTime(0.2, ctx.currentTime);
        gain.gain.exponentialRampToValueAtTime(0.01, ctx.currentTime + duration);
        osc.connect(gain);
        gain.connect(ctx.destination);
        osc.start();
        osc.stop(ctx.currentTime + duration);
      } catch (e) {}
    }

    function triggerTest() {
      const dangerSide = document.getElementById('dangerSide');
      const btnText = document.getElementById('btnText');
      const btnIcon = document.getElementById('btnIcon');
      const btnAction = document.getElementById('btnAction');

      if (!isBlown) {
        // Surge sound -> POP!
        playFx(320, 'sawtooth', 0.25);
        setTimeout(() => playFx(180, 'square', 0.15), 180);

        dangerSide.classList.add('is-blown');
        isBlown = true;
        btnText.textContent = 'Reset Fuse';
        btnIcon.textContent = '🔄';
        btnAction.style.background = '#475569';
      } else {
        // Reset sound
        playFx(580, 'sine', 0.15);

        dangerSide.classList.remove('is-blown');
        isBlown = false;
        btnText.textContent = 'Test Fault';
        btnIcon.textContent = '⚡';
        btnAction.style.background = '#0284c7';
      }
    }
  </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>Micropipette Two-Stop Displacement Technique</title>
  <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;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 8px 10px;
      width: 100%;
      min-height: 100%;
    }

    /* Controls Bar */
    .controls {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 6px;
      width: 100%;
      max-width: 580px;
      margin-bottom: 8px;
    }
    .step-btn {
      padding: 7px 4px;
      font-size: 12px;
      font-weight: 700;
      background: #ffffff;
      color: #475569;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      cursor: pointer;
      text-align: center;
      transition: background 0.15s, color 0.15s, border-color 0.15s;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    .step-btn:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }
    .step-btn.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
    }

    /* Responsive Panels Container */
    .panels-container {
      display: flex;
      flex-direction: row;
      gap: 8px;
      width: 100%;
      max-width: 580px;
      justify-content: center;
    }

    .panel {
      flex: 1 1 50%;
      min-width: 0;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    svg {
      width: 100%;
      height: auto;
      display: block;
      max-height: 220px;
    }

    /* Animated Components */
    .plunger-thumb {
      transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .pipette-assembly {
      transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      transform-origin: 125px 40px;
    }
    .tip-liquid {
      transition: points 0.35s ease, opacity 0.25s ease;
    }
    .droplet {
      transition: cy 0.35s ease, opacity 0.25s ease;
    }
    .vessel-liquid {
      transition: y 0.35s ease, height 0.35s ease;
    }
    .meniscus-line {
      transition: y1 0.35s ease, y2 0.35s ease;
    }

    /* Critical Alert Box */
    .alert-box {
      width: 100%;
      max-width: 580px;
      margin-top: 8px;
      padding: 8px 12px;
      background: #fff1f2;
      border-left: 4px solid #e11d48;
      border-radius: 4px;
      font-size: 11.5px;
      line-height: 1.35;
      color: #881337;
    }
    .alert-box strong {
      color: #be123c;
      font-weight: 800;
    }

    /* Mobile Viewport Stacking */
    @media (max-width: 480px) {
      .controls {
        grid-template-columns: repeat(2, 1fr);
      }
      .panels-container {
        flex-direction: column;
        gap: 6px;
      }
      .panel {
        flex: 1 1 100%;
      }
      svg {
        max-height: 165px;
      }
      .alert-box {
        font-size: 11px;
        padding: 6px 10px;
      }
    }
  </style>
</head>
<body>

  
  <div class="controls" role="group" aria-label="Pipetting Steps">
    <button class="step-btn active" onclick="setStep(0)">1. Push 1st</button>
    <button class="step-btn" onclick="setStep(1)">2. Aspirate</button>
    <button class="step-btn" onclick="setStep(2)">3. Dispense</button>
    <button class="step-btn" onclick="setStep(3)">4. Purge 2nd</button>
  </div>

  
  <div class="panels-container">
    
    
    <div class="panel">
      <svg viewBox="0 0 250 205" aria-label="Plunger Positions Diagram">
        <defs>
          <filter id="thumbShadow" x="-10%" y="-10%" width="130%" height="130%">
            <feDropShadow dx="0" dy="1" stdDeviation="1.5" flood-color="#0284c7" flood-opacity="0.3"/>
          </filter>
        </defs>

        
        <text x="14" y="20" font-size="11" font-weight="800" fill="#1e2945" letter-spacing="0.5">PLUNGER STOPS</text>
        
        
        <line x1="34" y1="36" x2="34" y2="176" stroke="#cbd5e1" stroke-width="6" stroke-linecap="round"/>

        
        <g id="lbl-rest">
          <line x1="22" y1="46" x2="46" y2="46" stroke="#94a3b8" stroke-width="1.5" stroke-dasharray="2,2"/>
          <circle cx="34" cy="46" r="4.5" fill="#64748b"/>
          <text x="64" y="50" font-size="12" font-weight="700" fill="#1e2945">Rest Position</text>
        </g>

        
        <g id="lbl-stop1">
          <line x1="22" y1="106" x2="46" y2="106" stroke="#38bdf8" stroke-width="1.5" stroke-dasharray="2,2"/>
          <circle cx="34" cy="106" r="4.5" fill="#0284c7"/>
          <text x="64" y="102" font-size="12" font-weight="700" fill="#0284c7">First Stop</text>
          <text x="64" y="117" font-size="10.5" font-weight="600" fill="#64748b">Aspiration Volume</text>
        </g>

        
        <g id="lbl-stop2">
          <line x1="22" y1="166" x2="46" y2="166" stroke="#f87171" stroke-width="1.5" stroke-dasharray="2,2"/>
          <circle cx="34" cy="166" r="4.5" fill="#e11d48"/>
          <text x="64" y="162" font-size="12" font-weight="700" fill="#be123c">Second Stop</text>
          <text x="64" y="177" font-size="10.5" font-weight="600" fill="#64748b">Blowout Purge</text>
        </g>

        
        <g id="plungerThumb" class="plunger-thumb" transform="translate(0, 0)">
          
          <polygon points="6,46 13,41 13,51" fill="#0284c7"/>
          
          <rect x="14" y="38" width="36" height="16" rx="4" fill="#22b7ff" stroke="#0284c7" stroke-width="1.5" filter="url(#thumbShadow)"/>
          
          <line x1="27" y1="42" x2="27" y2="50" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round"/>
          <line x1="32" y1="42" x2="32" y2="50" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round"/>
          <line x1="37" y1="42" x2="37" y2="50" stroke="#ffffff" stroke-width="1.5" stroke-linecap="round"/>
        </g>
      </svg>
    </div>

    
    <div class="panel">
      <svg viewBox="0 0 250 205" aria-label="Micropipette Action Simulation">
        <defs>
          <linearGradient id="bodyGrad" x1="0" y1="0" x2="1" y2="0">
            <stop offset="0%" stop-color="#1e2945"/>
            <stop offset="100%" stop-color="#0f172a"/>
          </linearGradient>
          <linearGradient id="shaftGrad" x1="0" y1="0" x2="1" y2="0">
            <stop offset="0%" stop-color="#f8fafc"/>
            <stop offset="100%" stop-color="#cbd5e1"/>
          </linearGradient>
        </defs>

        
        <rect x="10" y="8" width="135" height="20" rx="4" fill="#1e2945" fill-opacity="0.08"/>
        <text id="stepBadge" x="77" y="22" text-anchor="middle" font-size="10.5" font-weight="800" fill="#1e2945">1. DEPRESS TO 1ST</text>

        
        <path d="M 125,24 L 125,178" stroke="#cbd5e1" stroke-dasharray="3,3" stroke-width="1"/>
        <path d="M 125,70 A 45 45 0 0 1 139,73" fill="none" stroke="#64748b" stroke-width="1.5"/>
        <text x="142" y="68" font-size="10.5" font-weight="700" fill="#64748b">≤20°</text>

        
        <g transform="translate(93, 115)">
          
          <rect id="vesselLiquid" class="vessel-liquid" x="4" y="44" width="56" height="32" rx="3" fill="#10b981" fill-opacity="0.3"/>
          <line id="meniscus" class="meniscus-line" x1="4" y1="44" x2="60" y2="44" stroke="#10b981" stroke-width="2"/>
          
          <rect x="2" y="10" width="60" height="68" rx="6" fill="none" stroke="#64748b" stroke-width="2"/>
        </g>

        
        <g id="pipette" class="pipette-assembly" transform="translate(0, 0)">
          
          <rect x="117" y="5" width="16" height="72" rx="3" fill="url(#bodyGrad)"/>
          
          <rect x="121" y="77" width="8" height="36" fill="url(#shaftGrad)" stroke="#94a3b8" stroke-width="0.5"/>
          
          <rect x="119" y="111" width="12" height="4" rx="1" fill="#64748b"/>
          
          
          <polygon points="120,115 130,115 127,156 123,156" fill="#ffffff" fill-opacity="0.85" stroke="#22b7ff" stroke-width="1.2"/>

          
          <polygon id="tipLiquid" class="tip-liquid" points="123,156 127,156 127,156 123,156" fill="#10b981"/>

          
          <ellipse id="droplet" class="droplet" cx="125" cy="162" rx="2.2" ry="3" fill="#10b981" opacity="0"/>
        </g>
      </svg>
    </div>

  </div>

  
  <div class="alert-box" role="alert">
    <strong>CRITICAL:</strong> Never invert or lay down a loaded micropipette — fluid entering the internal piston barrel causes chemical corrosion and calibration failure.
  </div>

  <script>
    const steps = [
      {
        badge: "1. DEPRESS TO 1ST",
        plungerOffset: 60, // First Stop
        pipetteTransform: "translate(0, 0)",
        tipLiquidPoints: "123,156 127,156 127,156 123,156", // Empty
        dropletOpacity: 0,
        dropletY: 162,
        vesselLiquidY: 44,
        vesselLiquidH: 32
      },
      {
        badge: "2. ASPIRATE",
        plungerOffset: 0, // Rest Position
        pipetteTransform: "translate(0, 20)", // Submerged
        tipLiquidPoints: "121,126 129,126 127,156 123,156", // Filled
        dropletOpacity: 0,
        dropletY: 162,
        vesselLiquidY: 54,
        vesselLiquidH: 22
      },
      {
        badge: "3. DISPENSE",
        plungerOffset: 60, // First Stop
        pipetteTransform: "translate(0, 14)", // Inside target
        tipLiquidPoints: "123,153 127,153 127,156 123,156", // Minimal droplet left
        dropletOpacity: 1,
        dropletY: 161,
        vesselLiquidY: 48,
        vesselLiquidH: 28
      },
      {
        badge: "4. BLOWOUT (2ND)",
        plungerOffset: 120, // Second Stop
        pipetteTransform: "translate(0, 10)",
        tipLiquidPoints: "123,156 127,156 127,156 123,156", // Completely expelled
        dropletOpacity: 0,
        dropletY: 172,
        vesselLiquidY: 44,
        vesselLiquidH: 32
      }
    ];

    let currentStep = 0;
    let autoInterval = null;

    function setStep(index) {
      currentStep = index;
      const s = steps[index];

      // Update button states
      document.querySelectorAll('.step-btn').forEach((btn, idx) => {
        btn.classList.toggle('active', idx === index);
      });

      // Update Plunger indicator
      document.getElementById('plungerThumb').style.transform = `translate(0px, ${s.plungerOffset}px)`;

      // Update Pipette vertical position
      document.getElementById('pipette').style.transform = s.pipetteTransform;

      // Update Liquid in tip
      document.getElementById('tipLiquid').setAttribute('points', s.tipLiquidPoints);

      // Update Droplet
      const droplet = document.getElementById('droplet');
      droplet.style.opacity = s.dropletOpacity;
      droplet.setAttribute('cy', s.dropletY);

      // Update Vessel Liquid
      const vLiquid = document.getElementById('vesselLiquid');
      vLiquid.setAttribute('y', s.vesselLiquidY);
      vLiquid.setAttribute('height', s.vesselLiquidH);
      document.getElementById('meniscus').setAttribute('y1', s.vesselLiquidY);
      document.getElementById('meniscus').setAttribute('y2', s.vesselLiquidY);

      // Update Action Badge
      document.getElementById('stepBadge').textContent = s.badge;
    }

    function startCycle() {
      autoInterval = setInterval(() => {
        setStep((currentStep + 1) % steps.length);
      }, 3400);
    }

    // Stop auto-cycle when user manually clicks
    document.querySelectorAll('.step-btn').forEach(btn => {
      btn.addEventListener('click', () => {
        if (autoInterval) clearInterval(autoInterval);
      });
    });

    // Initialize
    setStep(0);
    startCycle();
  </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>Always Add Acid (AAA) Rule</title>
  <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: #0f172a;
      width: 100%;
      padding: 6px 8px;
      display: flex;
      justify-content: center;
    }

    .container {
      width: 100%;
      max-width: 660px;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .header-rule {
      text-align: center;
      font-size: 13px;
      font-weight: 700;
      color: #334155;
      letter-spacing: 0.2px;
    }

    .rule-highlight {
      color: #2563eb;
      background: #eff6ff;
      padding: 2px 8px;
      border-radius: 6px;
      border: 1px solid #bfdbfe;
      display: inline-block;
    }

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

    @media (max-width: 440px) {
      .panels {
        grid-template-columns: 1fr;
        gap: 10px;
      }
    }

    .panel-col {
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .panel-title {
      font-size: 12px;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: 16px;
      margin-bottom: 4px;
      display: inline-flex;
      align-items: center;
      gap: 5px;
    }

    .panel-title.danger {
      background: #fee2e2;
      color: #991b1b;
      border: 1px solid #f87171;
    }

    .panel-title.safe {
      background: #dcfce7;
      color: #166534;
      border: 1px solid #4ade80;
    }

    .svg-scene {
      width: 100%;
      height: auto;
      max-height: 250px;
      display: block;
    }

    .caption {
      font-size: 11px;
      line-height: 1.35;
      text-align: center;
      margin-top: 4px;
      font-weight: 500;
      max-width: 250px;
    }

    .caption.danger {
      color: #b91c1c;
    }

    .caption.safe {
      color: #15803d;
    }

    /* Paced Smooth Keyframe Animations (4.8s cycle) */
    
    /* Left: Water Droplet Falling */
    @keyframes dropWater {
      0% { transform: translateY(0); opacity: 0; }
      4% { opacity: 1; }
      22% { transform: translateY(58px); opacity: 1; }
      23%, 100% { transform: translateY(58px); opacity: 0; }
    }

    /* Left: Flash Boiling Burst */
    @keyframes flashBurst {
      0%, 22% { opacity: 0; transform: scale(0.4); }
      26% { opacity: 1; transform: scale(1.25); }
      32% { transform: scale(1); }
      65% { opacity: 0.9; transform: scale(1.05); }
      75% { opacity: 0; transform: scale(0.8); }
      100% { opacity: 0; }
    }

    /* Left: Acid Splatter Drops */
    @keyframes spatLeft1 {
      0%, 23% { transform: translate(0, 0) scale(0.6); opacity: 0; }
      27% { opacity: 1; }
      48% { transform: translate(-34px, -52px) scale(1.1); opacity: 1; }
      68% { transform: translate(-42px, -24px) scale(0.9); opacity: 0.9; }
      76%, 100% { opacity: 0; }
    }

    @keyframes spatRight1 {
      0%, 23% { transform: translate(0, 0) scale(0.6); opacity: 0; }
      27% { opacity: 1; }
      48% { transform: translate(32px, -58px) scale(1.1); opacity: 1; }
      68% { transform: translate(40px, -28px) scale(0.9); opacity: 0.9; }
      76%, 100% { opacity: 0; }
    }

    @keyframes spatCenter {
      0%, 23% { transform: translate(0, 0) scale(0.6); opacity: 0; }
      27% { opacity: 1; }
      46% { transform: translate(6px, -70px) scale(1); opacity: 1; }
      68% { transform: translate(10px, -45px) scale(0.8); opacity: 0.8; }
      76%, 100% { opacity: 0; }
    }

    /* Left: Steam & Heat Waves */
    @keyframes steamRise {
      0%, 23% { opacity: 0; transform: translateY(0); }
      30% { opacity: 0.85; }
      65% { opacity: 0.75; transform: translateY(-16px); }
      75%, 100% { opacity: 0; transform: translateY(-24px); }
    }

    /* Left: Warning Badge Callout */
    @keyframes warnCallout {
      0%, 24% { opacity: 0; transform: scale(0.7); }
      30% { opacity: 1; transform: scale(1.05); }
      35%, 68% { opacity: 1; transform: scale(1); }
      76%, 100% { opacity: 0; transform: scale(0.9); }
    }

    /* Right: Acid Droplet Falling and Sinking */
    @keyframes dropAcidSink {
      0% { transform: translateY(0); opacity: 0; }
      4% { opacity: 1; }
      22% { transform: translateY(58px); opacity: 1; }
      32% { transform: translateY(78px); opacity: 0.85; }
      55% { transform: translateY(105px); opacity: 0.4; }
      65%, 100% { transform: translateY(115px); opacity: 0; }
    }

    /* Right: Gentle Dissolving Streams */
    @keyframes acidDissolve {
      0%, 22% { opacity: 0; transform: scaleY(0.2); }
      35% { opacity: 0.8; transform: scaleY(0.8); }
      55% { opacity: 0.6; transform: scaleY(1.1); }
      72% { opacity: 0; transform: scaleY(1.3); }
      100% { opacity: 0; }
    }

    /* Right: Gradual Safe Heat Diffusion */
    @keyframes gentleHeat {
      0%, 22% { opacity: 0; }
      35% { opacity: 0.4; }
      55%, 72% { opacity: 0.75; }
      82%, 100% { opacity: 0; }
    }

    /* Right: Stirring Rod Movement */
    @keyframes stirRodMotion {
      0%, 100% { transform: rotate(0deg); }
      25% { transform: rotate(-4.5deg); }
      75% { transform: rotate(4.5deg); }
    }

    /* Animation Classes */
    .anim-drop-water {
      animation: dropWater 4.8s infinite ease-in;
    }

    .anim-flash-burst {
      animation: flashBurst 4.8s infinite ease-out;
      transform-origin: 100px 114px;
    }

    .anim-spat-l1 {
      animation: spatLeft1 4.8s infinite cubic-bezier(0.25, 1, 0.5, 1);
    }

    .anim-spat-r1 {
      animation: spatRight1 4.8s infinite cubic-bezier(0.25, 1, 0.5, 1);
    }

    .anim-spat-c {
      animation: spatCenter 4.8s infinite cubic-bezier(0.25, 1, 0.5, 1);
    }

    .anim-steam {
      animation: steamRise 4.8s infinite ease-out;
    }

    .anim-warn-callout {
      animation: warnCallout 4.8s infinite ease-out;
      transform-origin: 100px 65px;
    }

    .anim-drop-acid-sink {
      animation: dropAcidSink 4.8s infinite cubic-bezier(0.4, 0, 0.2, 1);
    }

    .anim-acid-dissolve {
      animation: acidDissolve 4.8s infinite ease-out;
      transform-origin: 100px 114px;
    }

    .anim-gentle-heat {
      animation: gentleHeat 4.8s infinite ease-in-out;
    }

    .anim-stir-rod {
      animation: stirRodMotion 2.4s infinite ease-in-out;
      transform-origin: 130px 25px;
    }
  </style>
</head>
<body>

  <div class="container">
    <div class="header-rule">
      Safety Rule: <span class="rule-highlight">Always Add Acid to Water (AAA)</span>
    </div>

    <div class="panels">
      
      <div class="panel-col">
        <div class="panel-title danger">❌ INCORRECT: Water to Acid</div>
        <svg class="svg-scene" viewBox="0 0 200 205" aria-label="Diagram of incorrect dilution: adding water to acid causing flash boiling">
          <defs>
            
            <radialGradient id="heatBurstGrad" cx="50%" cy="50%" r="50%">
              <stop offset="0%" stop-color="#ef4444" stop-opacity="0.95" />
              <stop offset="45%" stop-color="#f97316" stop-opacity="0.8" />
              <stop offset="85%" stop-color="#fbbf24" stop-opacity="0.5" />
              <stop offset="100%" stop-color="#fbbf24" stop-opacity="0" />
            </radialGradient>
            
            
            <linearGradient id="concAcidGrad" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#f59e0b" stop-opacity="0.95" />
              <stop offset="100%" stop-color="#d97706" stop-opacity="1" />
            </linearGradient>

            <filter id="glow" x="-20%" y="-20%" width="140%" height="140%">
              <feDropShadow dx="0" dy="1" stdDeviation="1.5" flood-color="#dc2626" flood-opacity="0.4" />
            </filter>
          </defs>

          
          <path d="M95 10 L105 10 L104 42 L96 42 Z" fill="#94a3b8" />
          <path d="M96 42 L104 42 L102 54 L98 54 Z" fill="#64748b" />
          <rect x="94" y="6" width="12" height="4" rx="2" fill="#475569" />
          <text x="114" y="32" font-size="11" font-weight="700" fill="#0284c7">H₂O</text>

          
          <g class="anim-drop-water">
            <ellipse cx="100" cy="56" rx="3.5" ry="4.5" fill="#0284c7" />
          </g>

          
          <circle class="anim-flash-burst" cx="100" cy="114" r="32" fill="url(#heatBurstGrad)" />

          
          <g class="anim-steam">
            <path d="M86 102 Q84 94 88 88 T86 78" fill="none" stroke="#f87171" stroke-width="2" stroke-linecap="round" opacity="0.8" />
            <path d="M100 100 Q98 90 102 82 T100 70" fill="none" stroke="#ea580c" stroke-width="2" stroke-linecap="round" opacity="0.8" />
            <path d="M114 102 Q116 94 112 88 T114 78" fill="none" stroke="#f87171" stroke-width="2" stroke-linecap="round" opacity="0.8" />
          </g>

          
          <path d="M50 82 L56 82 L56 178 A6 6 0 0 0 62 184 L138 184 A6 6 0 0 0 144 178 L144 82 L150 82" 
                fill="none" stroke="#64748b" stroke-width="2.5" stroke-linecap="round" />
          
          <line x1="56" y1="130" x2="66" y2="130" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="56" y1="150" x2="64" y2="150" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="56" y1="170" x2="66" y2="170" stroke="#94a3b8" stroke-width="1.5" />

          
          <path d="M57 114 L143 114 L143 178 A5 5 0 0 1 138 183 L62 183 A5 5 0 0 1 57 178 Z" fill="url(#concAcidGrad)" />
          <text x="100" y="152" font-size="12" font-weight="800" fill="#78350f" text-anchor="middle">Concentrated Acid</text>
          <text x="100" y="167" font-size="9.5" font-weight="600" fill="#92400e" text-anchor="middle">(Low Heat Capacity Pool)</text>

          
          <g class="anim-spat-l1">
            <ellipse cx="98" cy="112" rx="3.5" ry="4" fill="#f59e0b" stroke="#b91c1c" stroke-width="1" />
          </g>
          <g class="anim-spat-r1">
            <ellipse cx="102" cy="112" rx="3.5" ry="4" fill="#f59e0b" stroke="#b91c1c" stroke-width="1" />
          </g>
          <g class="anim-spat-c">
            <circle cx="100" cy="112" r="3" fill="#f59e0b" stroke="#b91c1c" stroke-width="1" />
          </g>

          
          <g class="anim-warn-callout" filter="url(#glow)">
            <rect x="42" y="52" width="116" height="24" rx="6" fill="#b91c1c" />
            <text x="100" y="68" font-size="10.5" font-weight="800" fill="#ffffff" text-anchor="middle">⚠️ ACID SPLATTERS!</text>
          </g>

          
          <text x="100" y="198" font-size="10" font-weight="700" fill="#dc2626" text-anchor="middle">Localized Extreme Heat</text>
        </svg>
        <div class="caption danger">
          Small droplet flash-boils instantly on dense acid, violently spitting corrosive droplets.
        </div>
      </div>

      
      <div class="panel-col">
        <div class="panel-title safe">✅ CORRECT: Acid to Water</div>
        <svg class="svg-scene" viewBox="0 0 200 205" aria-label="Diagram of correct dilution: adding acid to water with safe heat dissipation">
          <defs>
            
            <linearGradient id="bulkWaterGrad" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#bae6fd" stop-opacity="0.85" />
              <stop offset="100%" stop-color="#38bdf8" stop-opacity="0.75" />
            </linearGradient>

            
            <radialGradient id="safeHeatGrad" cx="50%" cy="58%" r="52%">
              <stop offset="0%" stop-color="#f59e0b" stop-opacity="0.45" />
              <stop offset="55%" stop-color="#38bdf8" stop-opacity="0.25" />
              <stop offset="100%" stop-color="#38bdf8" stop-opacity="0" />
            </radialGradient>
          </defs>

          
          <path d="M75 10 L85 10 L84 42 L76 42 Z" fill="#94a3b8" />
          <path d="M76 42 L84 42 L82 54 L78 54 Z" fill="#64748b" />
          <rect x="74" y="6" width="12" height="4" rx="2" fill="#475569" />
          <text x="46" y="32" font-size="11" font-weight="700" fill="#b45309">Acid</text>

          
          <g class="anim-stir-rod">
            <line x1="132" y1="16" x2="98" y2="174" stroke="#94a3b8" stroke-width="5" stroke-linecap="round" opacity="0.7" />
            <line x1="131" y1="16" x2="97" y2="174" stroke="#ffffff" stroke-width="2" stroke-linecap="round" opacity="0.9" />
          </g>

          
          <path d="M50 82 L56 82 L56 178 A6 6 0 0 0 62 184 L138 184 A6 6 0 0 0 144 178 L144 82 L150 82" 
                fill="none" stroke="#64748b" stroke-width="2.5" stroke-linecap="round" />
          
          <line x1="56" y1="110" x2="66" y2="110" stroke="#64748b" stroke-width="1.5" />
          <line x1="56" y1="130" x2="64" y2="130" stroke="#64748b" stroke-width="1.5" />
          <line x1="56" y1="150" x2="66" y2="150" stroke="#64748b" stroke-width="1.5" />
          <line x1="56" y1="170" x2="64" y2="170" stroke="#64748b" stroke-width="1.5" />

          
          <path d="M57 96 L143 96 L143 178 A5 5 0 0 1 138 183 L62 183 A5 5 0 0 1 57 178 Z" fill="url(#bulkWaterGrad)" />

          
          <circle class="anim-gentle-heat" cx="100" cy="142" r="44" fill="url(#safeHeatGrad)" />

          
          <g class="anim-acid-dissolve">
            <path d="M80 100 Q78 120 84 135 T80 155" fill="none" stroke="#f59e0b" stroke-width="2" stroke-linecap="round" opacity="0.7" />
            <path d="M82 100 Q88 125 82 142 T86 160" fill="none" stroke="#d97706" stroke-width="1.5" stroke-linecap="round" opacity="0.6" />
          </g>

          
          <g class="anim-drop-acid-sink">
            <ellipse cx="80" cy="56" rx="3.5" ry="4.5" fill="#f59e0b" stroke="#d97706" stroke-width="0.5" />
          </g>

          
          <text x="100" y="148" font-size="12" font-weight="800" fill="#0369a1" text-anchor="middle">Large Water Volume</text>
          <text x="100" y="163" font-size="9.5" font-weight="600" fill="#0284c7" text-anchor="middle">(High Heat Capacity Sink)</text>

          
          <g class="anim-gentle-heat" opacity="0.7">
            <path d="M72 135 L64 135" stroke="#0284c7" stroke-width="1.5" marker-end="none" stroke-linecap="round" />
            <path d="M128 135 L136 135" stroke="#0284c7" stroke-width="1.5" marker-end="none" stroke-linecap="round" />
          </g>

          
          <text x="100" y="198" font-size="10" font-weight="700" fill="#15803d" text-anchor="middle">Heat Dissipates Smoothly</text>
        </svg>
        <div class="caption safe">
          Dense acid sinks into bulk water; high heat capacity absorbs energy safely with stirring.
        </div>
      </div>
    </div>
  </div>

</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;
    }
    body {
      background: #ffffff;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 100%;
    }
    .controls {
      display: flex;
      gap: 10px;
      margin-bottom: 12px;
      width: 100%;
      max-width: 440px;
      justify-content: center;
    }
    .btn-toggle {
      flex: 1;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 600;
      border: 1px solid #d1d5db;
      border-radius: 8px;
      background: #f8fafc;
      color: #1e2945;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      transition: all 0.25s ease;
    }
    .btn-toggle.active {
      background: #1e2945;
      color: #ffffff;
      border-color: #1e2945;
      box-shadow: 0 2px 6px rgba(30, 41, 69, 0.2);
    }
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
      max-width: 580px;
      flex: 1;
    }
    .beaker-card {
      background: #f8fafc;
      border-radius: 12px;
      padding: 10px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      position: relative;
    }
    .status-badge {
      font-size: 13px;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: 12px;
      margin-bottom: 6px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .badge-safe {
      background: #e0f2fe;
      color: #0284c7;
    }
    .badge-unsafe {
      background: #fee2e2;
      color: #dc2626;
    }
    .svg-container {
      width: 100%;
      max-width: 200px;
      height: 180px;
    }
    svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }
    /* Animated Heat & Fracture Elements */
    .heat-wave {
      transition: opacity 0.4s ease;
      opacity: 0;
    }
    .mode-heat .heat-wave {
      opacity: 1;
    }
    .burner-flame {
      transition: opacity 0.3s ease, transform 0.3s ease;
      opacity: 0;
      transform-origin: center bottom;
      transform: scale(0.6);
    }
    .mode-heat .burner-flame {
      opacity: 1;
      transform: scale(1);
    }
    .inspect-element {
      transition: opacity 0.3s ease;
      opacity: 1;
    }
    .mode-heat .inspect-element {
      opacity: 0;
      pointer-events: none;
    }
    .fracture-line {
      stroke-dasharray: 80;
      stroke-dashoffset: 80;
      transition: stroke-dashoffset 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .mode-heat .fracture-line {
      stroke-dashoffset: 0;
    }
    .shatter-stress {
      opacity: 0;
      transition: opacity 0.4s ease 0.2s;
    }
    .mode-heat .shatter-stress {
      opacity: 1;
    }
    .card-footer-label {
      font-size: 13px;
      font-weight: 600;
      margin-top: 4px;
      color: #475569;
      text-align: center;
    }
  </style>
</head>
<body id="diagramRoot">

  <div class="controls">
    <button id="btnInspect" class="btn-toggle active" onclick="setMode('inspect')">
      🔍 Check for Cracks
    </button>
    <button id="btnHeat" class="btn-toggle" onclick="setMode('heat')">
      🔥 Apply Heat
    </button>
  </div>

  <div class="comparison-grid">
    
    <div class="beaker-card">
      <span class="status-badge badge-safe">✓ Borosilicate 3.3</span>
      
      <div class="svg-container">
        <svg viewBox="0 0 160 170">
          <defs>
            <linearGradient id="safeHeatGrad" x1="0%" y1="100%" x2="0%" y2="0%">
              <stop offset="0%" stop-color="#22b7ff" stop-opacity="0.35" />
              <stop offset="100%" stop-color="#22b7ff" stop-opacity="0.02" />
            </linearGradient>
            <linearGradient id="flameSafe" x1="0%" y1="100%" x2="0%" y2="0%">
              <stop offset="0%" stop-color="#0284c7" />
              <stop offset="100%" stop-color="#38bdf8" />
            </linearGradient>
          </defs>

          
          <rect x="35" y="25" width="90" height="95" rx="8" fill="#f0f9ff" stroke="#22b7ff" stroke-width="2.5" />
          <path d="M30 25 L130 25" stroke="#22b7ff" stroke-width="3" stroke-linecap="round" />
          
          
          <line x1="105" y1="45" x2="120" y2="45" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="110" y1="65" x2="120" y2="65" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="105" y1="85" x2="120" y2="85" stroke="#94a3b8" stroke-width="1.5" />
          <line x1="110" y1="105" x2="120" y2="105" stroke="#94a3b8" stroke-width="1.5" />

          
          <g class="inspect-element">
            <rect x="42" y="48" width="52" height="28" rx="4" fill="#ffffff" stroke="#22b7ff" stroke-width="1.5" />
            <text x="68" y="60" text-anchor="middle" font-size="7.5" font-weight="700" fill="#0284c7">PYREX</text>
            <text x="68" y="70" text-anchor="middle" font-size="6.5" font-weight="600" fill="#22b7ff">BORO 3.3</text>
          </g>

          
          <g class="heat-wave">
            <rect x="37" y="27" width="86" height="91" rx="6" fill="url(#safeHeatGrad)" />
            <path d="M50 110 Q50 70 60 40" fill="none" stroke="#22b7ff" stroke-width="2" stroke-dasharray="4,4" />
            <path d="M80 110 Q80 70 80 40" fill="none" stroke="#22b7ff" stroke-width="2" stroke-dasharray="4,4" />
            <path d="M110 110 Q110 70 100 40" fill="none" stroke="#22b7ff" stroke-width="2" stroke-dasharray="4,4" />
          </g>

          
          <line x1="25" y1="140" x2="135" y2="140" stroke="#cbd5e1" stroke-width="3" />
          <g class="burner-flame">
            <path d="M80 140 Q68 126 80 116 Q92 126 80 140 Z" fill="url(#flameSafe)" />
            <path d="M80 140 Q74 130 80 123 Q86 130 80 140 Z" fill="#e0f2fe" />
          </g>
        </svg>
      </div>

      <div id="safeLabel" class="card-footer-label">Even Expansion</div>
    </div>

    
    <div class="beaker-card">
      <span class="status-badge badge-unsafe">⚠ Star Crack</span>

      <div class="svg-container">
        <svg viewBox="0 0 160 170">
          <defs>
            <linearGradient id="flameHazard" x1="0%" y1="100%" x2="0%" y2="0%">
              <stop offset="0%" stop-color="#ea580c" />
              <stop offset="100%" stop-color="#facc15" />
            </linearGradient>
            <radialGradient id="stressGlow" cx="45%" cy="85%" r="50%">
              <stop offset="0%" stop-color="#d9534f" stop-opacity="0.45" />
              <stop offset="100%" stop-color="#d9534f" stop-opacity="0" />
            </radialGradient>
          </defs>

          
          <rect x="35" y="25" width="90" height="95" rx="8" fill="#fff5f5" stroke="#94a3b8" stroke-width="2.5" />
          <path d="M30 25 L130 25" stroke="#94a3b8" stroke-width="3" stroke-linecap="round" />

          
          <line x1="105" y1="45" x2="120" y2="45" stroke="#cbd5e1" stroke-width="1.5" />
          <line x1="110" y1="65" x2="120" y2="65" stroke="#cbd5e1" stroke-width="1.5" />
          <line x1="105" y1="85" x2="120" y2="85" stroke="#cbd5e1" stroke-width="1.5" />
          <line x1="110" y1="105" x2="120" y2="105" stroke="#cbd5e1" stroke-width="1.5" />

          
          <g transform="translate(56, 110)">
            <path d="M-2 -2 L2 2 M-2 2 L2 -2 M0 -3 L0 3" stroke="#d9534f" stroke-width="1.8" />
          </g>

          
          <g class="inspect-element">
            <line x1="56" y1="110" x2="48" y2="68" stroke="#d9534f" stroke-dasharray="2,2" stroke-width="1.5" />
            <circle cx="48" cy="58" r="22" fill="#ffffff" stroke="#d9534f" stroke-width="2" />
            
            <path d="M38 58 L58 58 M48 48 L48 68 M41 51 L55 65 M41 65 L55 51" stroke="#d9534f" stroke-width="2.5" stroke-linecap="round" />
            <circle cx="48" cy="58" r="3" fill="#d9534f" />
          </g>

          
          <g class="shatter-stress">
            <rect x="37" y="27" width="86" height="91" rx="6" fill="url(#stressGlow)" />
            <path class="fracture-line" d="M56 112 L44 95 L52 75 L38 52" fill="none" stroke="#d9534f" stroke-width="3" stroke-linecap="round" />
            <path class="fracture-line" d="M56 112 L78 114 L95 102 L122 108" fill="none" stroke="#d9534f" stroke-width="3" stroke-linecap="round" />
            <path class="fracture-line" d="M78 114 L85 88 L104 70" fill="none" stroke="#d9534f" stroke-width="2.5" stroke-linecap="round" />
          </g>

          
          <line x1="25" y1="140" x2="135" y2="140" stroke="#cbd5e1" stroke-width="3" />
          <g class="burner-flame">
            <path d="M80 140 Q68 126 80 116 Q92 126 80 140 Z" fill="url(#flameHazard)" />
            <path d="M80 140 Q74 130 80 123 Q86 130 80 140 Z" fill="#fef08a" />
          </g>
        </svg>
      </div>

      <div id="unsafeLabel" class="card-footer-label">Hairline Defect</div>
    </div>
  </div>

  <script>
    function setMode(mode) {
      const root = document.getElementById('diagramRoot');
      const btnInspect = document.getElementById('btnInspect');
      const btnHeat = document.getElementById('btnHeat');
      const safeLabel = document.getElementById('safeLabel');
      const unsafeLabel = document.getElementById('unsafeLabel');

      if (mode === 'heat') {
        root.classList.add('mode-heat');
        btnHeat.classList.add('active');
        btnInspect.classList.remove('active');
        safeLabel.textContent = 'Safe Convection';
        unsafeLabel.textContent = 'Thermal Shock Failure';
        unsafeLabel.style.color = '#dc2626';
      } else {
        root.classList.remove('mode-heat');
        btnInspect.classList.add('active');
        btnHeat.classList.remove('active');
        safeLabel.textContent = 'Even Expansion';
        unsafeLabel.textContent = 'Hairline Defect';
        unsafeLabel.style.color = '#475569';
      }
    }
  </script>
</body>
</html>

OGS.10.SEP.2

Aligned learning resources

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