<!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: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 12px;
      line-height: 1.3;
    }
    .grid-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      width: 100%;
      max-width: 760px;
      margin: 0 auto;
    }
    @media (max-width: 540px) {
      .grid-container {
        grid-template-columns: 1fr;
        gap: 20px;
      }
    }
    .panel {
      display: flex;
      flex-direction: column;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 14px;
    }
    .panel-header {
      font-size: 14px;
      font-weight: 700;
      color: #1e2945;
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 12px;
      padding-bottom: 8px;
      border-bottom: 1px solid #e2e8f0;
    }
    .badge-num {
      background: #e2e8f0;
      color: #1e2945;
      font-size: 11px;
      font-weight: 800;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    /* Left Panel: Meniscus */
    .meniscus-svg-wrap {
      width: 100%;
      height: auto;
      display: flex;
      justify-content: center;
      align-items: center;
      flex: 1;
    }
    svg {
      width: 100%;
      max-width: 320px;
      height: auto;
      overflow: visible;
    }

    /* Right Panel: Taring */
    .tare-flow {
      display: flex;
      flex-direction: column;
      gap: 10px;
      justify-content: space-between;
      flex: 1;
    }
    .tare-step {
      display: flex;
      align-items: center;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 8px 10px;
      gap: 12px;
      position: relative;
    }
    .step-tag {
      font-size: 11px;
      font-weight: 700;
      color: #64748b;
      min-width: 44px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .balance-ui {
      display: flex;
      align-items: center;
      gap: 8px;
      flex: 1;
      justify-content: space-between;
    }
    .balance-vis {
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 52px;
    }
    .pan-dish {
      width: 38px;
      height: 12px;
      border: 1.5px solid #94a3b8;
      border-top: none;
      border-radius: 0 0 6px 6px;
      background: #f1f5f9;
      position: relative;
      margin-bottom: 2px;
    }
    .chemical-powder {
      position: absolute;
      bottom: 1px;
      left: 4px;
      right: 4px;
      height: 6px;
      background: #d97706;
      border-radius: 0 0 4px 4px;
    }
    .pan-base {
      width: 48px;
      height: 4px;
      background: #cbd5e1;
      border-radius: 2px;
    }
    .lcd-screen {
      background: #0f172a;
      border-radius: 6px;
      padding: 4px 8px;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      font-size: 13px;
      font-weight: 700;
      color: #38bdf8;
      letter-spacing: 0.5px;
      min-width: 58px;
      text-align: right;
      box-shadow: inset 0 1px 3px rgba(0,0,0,0.4);
    }
    .btn-tare-ui {
      font-size: 9px;
      font-weight: 700;
      padding: 4px 6px;
      border-radius: 4px;
      border: 1px solid #cbd5e1;
      background: #f8fafc;
      color: #64748b;
    }
    .btn-tare-ui.active {
      background: #16a34a;
      color: #ffffff;
      border-color: #15803d;
      box-shadow: 0 0 0 2px rgba(22, 163, 74, 0.25);
    }
    .step-desc {
      font-size: 11px;
      font-weight: 600;
      color: #475569;
      min-width: 80px;
    }
    .pill-green {
      display: inline-block;
      background: #dcfce7;
      color: #15803d;
      border: 1px solid #bbf7d0;
      padding: 2px 6px;
      border-radius: 4px;
      font-size: 10px;
      font-weight: 700;
    }
    .arrow-divider {
      text-align: center;
      color: #94a3b8;
      font-size: 11px;
      line-height: 1;
      margin: -6px 0;
    }
  </style>
</head>
<body>

<div class="grid-container">
  
  <div class="panel">
    <div class="panel-header">
      <span class="badge-num">1</span>
      <span>Reading Meniscus (Liquids)</span>
    </div>

    <div class="meniscus-svg-wrap">
      <svg viewBox="0 0 310 190" xmlns="http://www.w3.org/2000/svg">
        <defs>
          <clipPath id="cylinderClip">
            <rect x="25" y="15" width="46" height="165" rx="3" />
          </clipPath>
        </defs>

        
        <g clip-path="url(#cylinderClip)">
          
          <path d="M 25,75 
                   L 25,185 
                   L 71,185 
                   L 71,75 
                   C 60,95 36,95 25,75 Z" 
                fill="#bae6fd" opacity="0.85" />
          
          <path d="M 25,75 C 36,95 60,95 71,75" 
                fill="none" stroke="#0284c7" stroke-width="2" />
        </g>

        
        <rect x="25" y="15" width="46" height="165" rx="3" fill="none" stroke="#64748b" stroke-width="2" />
        
        <path d="M 12,180 L 84,180" stroke="#64748b" stroke-width="4" stroke-linecap="round" />

        
        
        <line x1="25" y1="35" x2="42" y2="35" stroke="#334155" stroke-width="1.5" />
        <text x="20" y="38" font-size="10" font-weight="700" fill="#475569" text-anchor="end">26</text>
        
        
        <line x1="25" y1="65" x2="37" y2="65" stroke="#64748b" stroke-width="1" />

        
        <line x1="25" y1="95" x2="44" y2="95" stroke="#16a34a" stroke-width="2" />
        <text x="20" y="98" font-size="10" font-weight="800" fill="#16a34a" text-anchor="end">24</text>

        
        <line x1="25" y1="125" x2="37" y2="125" stroke="#64748b" stroke-width="1" />

        
        <line x1="25" y1="155" x2="42" y2="155" stroke="#334155" stroke-width="1.5" />
        <text x="20" y="158" font-size="10" font-weight="700" fill="#475569" text-anchor="end">22</text>

        
        <line x1="25" y1="50" x2="32" y2="50" stroke="#94a3b8" stroke-width="1" />
        <line x1="25" y1="80" x2="32" y2="80" stroke="#94a3b8" stroke-width="1" />
        <line x1="25" y1="110" x2="32" y2="110" stroke="#94a3b8" stroke-width="1" />
        <line x1="25" y1="140" x2="32" y2="140" stroke="#94a3b8" stroke-width="1" />

        
        
        <line x1="172" y1="95" x2="48" y2="95" stroke="#16a34a" stroke-width="2" />
        <circle cx="48" cy="95" r="3" fill="#16a34a" />

        
        <line x1="172" y1="36" x2="71" y2="75" stroke="#dc2626" stroke-width="1.5" stroke-dasharray="3,3" />
        <circle cx="71" cy="75" r="2.5" fill="#dc2626" />

        
        <line x1="172" y1="154" x2="48" y2="95" stroke="#dc2626" stroke-width="1.5" stroke-dasharray="3,3" />

        
        <g transform="translate(178, 26)">
          <path d="M 0,10 Q 11,0 22,10 Q 11,20 0,10 Z" fill="#fee2e2" stroke="#dc2626" stroke-width="1.5" />
          <circle cx="9" cy="10" r="4" fill="#dc2626" />
          <circle cx="8" cy="9" r="1" fill="#ffffff" />
        </g>
        <rect x="206" y="27" width="98" height="18" rx="4" fill="#fee2e2" stroke="#fecaca" />
        <text x="255" y="40" font-size="9.5" font-weight="700" fill="#dc2626" text-anchor="middle">High: +Over (~24.6)</text>

        
        <g transform="translate(178, 85)">
          <path d="M 0,10 Q 11,0 22,10 Q 11,20 0,10 Z" fill="#dcfce7" stroke="#16a34a" stroke-width="1.5" />
          <circle cx="9" cy="10" r="4" fill="#16a34a" />
          <circle cx="8" cy="9" r="1" fill="#ffffff" />
        </g>
        <rect x="206" y="86" width="98" height="18" rx="4" fill="#dcfce7" stroke="#bbf7d0" />
        <text x="255" y="99" font-size="9.5" font-weight="800" fill="#15803d" text-anchor="middle">Correct: 24.0 mL</text>

        
        <g transform="translate(178, 144)">
          <path d="M 0,10 Q 11,0 22,10 Q 11,20 0,10 Z" fill="#fee2e2" stroke="#dc2626" stroke-width="1.5" />
          <circle cx="9" cy="10" r="4" fill="#dc2626" />
          <circle cx="8" cy="9" r="1" fill="#ffffff" />
        </g>
        <rect x="206" y="145" width="98" height="18" rx="4" fill="#fee2e2" stroke="#fecaca" />
        <text x="255" y="158" font-size="9.5" font-weight="700" fill="#dc2626" text-anchor="middle">Low: -Under (~23.4)</text>
      </svg>
    </div>
  </div>

  
  <div class="panel">
    <div class="panel-header">
      <span class="badge-num">2</span>
      <span>Taring a Balance (Solids)</span>
    </div>

    <div class="tare-flow">
      
      <div class="tare-step">
        <span class="step-tag">Step 1</span>
        <div class="balance-ui">
          <div class="balance-vis">
            <div class="pan-dish"></div>
            <div class="pan-base"></div>
          </div>
          <div class="lcd-screen">4.20 g</div>
          <div class="btn-tare-ui">TARE</div>
        </div>
        <div class="step-desc">Dish mass only</div>
      </div>

      <div class="arrow-divider">↓</div>

      
      <div class="tare-step">
        <span class="step-tag">Step 2</span>
        <div class="balance-ui">
          <div class="balance-vis">
            <div class="pan-dish"></div>
            <div class="pan-base"></div>
          </div>
          <div class="lcd-screen">0.00 g</div>
          <div class="btn-tare-ui active">TARE ✓</div>
        </div>
        <div class="step-desc">Reset to zero</div>
      </div>

      <div class="arrow-divider">↓</div>

      
      <div class="tare-step">
        <span class="step-tag">Step 3</span>
        <div class="balance-ui">
          <div class="balance-vis">
            <div class="pan-dish">
              <div class="chemical-powder"></div>
            </div>
            <div class="pan-base"></div>
          </div>
          <div class="lcd-screen">1.50 g</div>
          <div class="btn-tare-ui">TARE</div>
        </div>
        <div class="step-desc">
          <span class="pill-green">Sample: 1.50 g</span>
        </div>
      </div>
    </div>
  </div>
</div>

</body>
</html>

Following Multistep Scientific Laboratory Protocols

<!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">
  <title>Environmental Parameter Control</title>
  <link rel="stylesheet" href="{{VENDOR_CDN}}/katex.min.css">
  <script src="{{VENDOR_CDN}}/katex.min.js"></script>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
      width: 100%;
      background: transparent;
      color: #1e2945;
      padding: 8px;
    }

    .grid-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      width: 100%;
      max-width: 620px;
      margin: 0 auto;
    }

    .param-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 180px;
      position: relative;
      cursor: pointer;
      user-select: none;
      transition: box-shadow 0.2s ease, border-color 0.2s ease;
    }

    .param-card:hover {
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
      border-color: #cbd5e1;
    }

    .card-header {
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      border-bottom: 1px solid #f1f5f9;
      padding-bottom: 4px;
    }

    .badge {
      font-size: 11px;
      font-weight: 600;
      padding: 2px 6px;
      border-radius: 6px;
      background: #eff6ff;
      color: #2563eb;
    }

    .card-body {
      width: 100%;
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 6px 0;
      position: relative;
    }

    .footer-label {
      font-size: 11px;
      font-weight: 600;
      color: #64748b;
      text-align: center;
      width: 100%;
      background: #f8fafc;
      padding: 4px;
      border-radius: 6px;
    }

    /* Card 1: Temp */
    .temp-stage {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .thermometer {
      width: 14px;
      height: 60px;
      background: #e2e8f0;
      border-radius: 10px;
      position: relative;
      border: 2px solid #cbd5e1;
    }
    .mercury {
      position: absolute;
      bottom: 2px;
      left: 2px;
      right: 2px;
      height: 55%;
      background: #2563eb;
      border-radius: 6px;
      transition: height 0.3s ease, background 0.3s ease;
    }
    .bulb {
      position: absolute;
      bottom: -8px;
      left: -5px;
      width: 20px;
      height: 20px;
      background: #2563eb;
      border-radius: 50%;
      border: 2px solid #cbd5e1;
      transition: background 0.3s ease;
    }
    .temp-math {
      font-size: 12px;
      color: #1e2945;
    }
    .warn-pill {
      font-size: 10px;
      font-weight: 700;
      color: #d97706;
      background: #fffbeb;
      border: 1px solid #fef3c7;
      padding: 2px 6px;
      border-radius: 4px;
      margin-top: 4px;
    }

    /* Card 2: Light */
    .vial-container {
      position: relative;
      width: 90px;
      height: 65px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .amber-vial {
      width: 32px;
      height: 52px;
      background: linear-gradient(135deg, #b45309, #78350f);
      border-radius: 4px 4px 8px 8px;
      position: relative;
      border: 1.5px solid #92400e;
      box-shadow: inset -3px 0 6px rgba(0,0,0,0.3);
    }
    .vial-cap {
      position: absolute;
      top: -8px;
      left: 4px;
      width: 24px;
      height: 8px;
      background: #334155;
      border-radius: 2px;
    }
    .vial-content {
      position: absolute;
      bottom: 4px;
      left: 3px;
      right: 3px;
      height: 30px;
      background: #60a5fa;
      border-radius: 2px 2px 6px 6px;
      opacity: 0.85;
    }
    .uv-beam {
      position: absolute;
      left: 0;
      top: 15px;
      width: 28px;
      height: 2px;
      background: #8b5cf6;
      transform: rotate(20deg);
      box-shadow: 0 0 6px #8b5cf6;
    }
    .deflect-ray {
      position: absolute;
      left: 20px;
      top: 24px;
      width: 22px;
      height: 2px;
      background: #a78bfa;
      transform: rotate(-40deg);
      opacity: 0.9;
    }

    /* Card 3: pH */
    .meter-box {
      background: #0f172a;
      border-radius: 8px;
      padding: 6px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      border: 1px solid #334155;
      box-shadow: inset 0 1px 4px rgba(0,0,0,0.5);
    }
    .lcd-display {
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
      font-size: 16px;
      font-weight: 700;
      color: #38bdf8;
      letter-spacing: 0.5px;
    }
    .ph-sub {
      font-size: 10px;
      color: #22c55e;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 3px;
      margin-top: 2px;
    }

    /* Card 4: Pressure */
    .piston-box {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      width: 100%;
    }
    .reaction-eq {
      font-size: 12px;
      font-weight: 700;
      color: #1e2945;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .shift-arrow {
      color: #2563eb;
      font-weight: 900;
      font-size: 14px;
    }

    @media (max-width: 480px) {
      .grid-container {
        grid-template-columns: 1fr;
        gap: 8px;
      }
      .param-card {
        min-height: 140px;
      }
    }
  </style>
</head>
<body>

  <div class="grid-container">
    
    <div class="param-card">
      <div class="card-header">
        <span>Temperature (T)</span>
        <span class="badge">Thermal</span>
      </div>
      <div class="card-body">
        <div class="temp-stage">
          <div class="thermometer">
            <div class="mercury" id="mercury"></div>
            <div class="bulb" id="bulb"></div>
          </div>
          <div>
            <div class="temp-math" id="arrhenius"></div>
            <div class="warn-pill">⚠️ Rate Doubling / 10°C</div>
          </div>
        </div>
      </div>
      <div class="footer-label">Arrhenius Kinetics</div>
    </div>

    
    <div class="param-card">
      <div class="card-header">
        <span>Ambient Light</span>
        <span class="badge">Photolysis</span>
      </div>
      <div class="card-body">
        <div class="vial-container">
          <div class="uv-beam" title="UV Light"></div>
          <div class="deflect-ray"></div>
          <div class="amber-vial">
            <div class="vial-cap"></div>
            <div class="vial-content"></div>
          </div>
        </div>
      </div>
      <div class="footer-label">Amber Shielded · UV Block</div>
    </div>

    
    <div class="param-card">
      <div class="card-header">
        <span>Buffer pH</span>
        <span class="badge">Ion Balance</span>
      </div>
      <div class="card-body">
        <div class="meter-box">
          <div class="lcd-display">7.40 pH</div>
          <div class="ph-sub"><span>✓</span> ±0.05 Stable</div>
        </div>
      </div>
      <div class="footer-label">Enzyme Stability Window</div>
    </div>

    
    <div class="param-card">
      <div class="card-header">
        <span>Pressure (P)</span>
        <span class="badge">Equilibrium</span>
      </div>
      <div class="card-body">
        <div class="piston-box">
          <div class="reaction-eq">
            <span>2 NO₂(g)</span>
            <span class="shift-arrow">⇌</span>
            <span>N₂O₄(g)</span>
          </div>
          <div style="font-size: 11px; color: #2563eb; font-weight: 600; margin-top: 4px;">
            ↑ P &nbsp;→&nbsp; Fewer Gas Moles
          </div>
        </div>
      </div>
      <div class="footer-label">Le Chatelier's Principle</div>
    </div>
  </div>

  <script>
    document.addEventListener("DOMContentLoaded", () => {
      // Render Arrhenius equation via KaTeX
      const eqEl = document.getElementById("arrhenius");
      if (window.katex && eqEl) {
        katex.render("k = A e^{-\\frac{E_a}{RT}}", eqEl, {
          throwOnError: false,
          displayMode: false
        });
      } else if (eqEl) {
        eqEl.textContent = "k = A·e^(-Ea/RT)";
      }
    });
  </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, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 12px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
    }
    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      width: 100%;
      max-width: 600px;
    }
    @media (max-width: 480px) {
      .grid {
        grid-template-columns: 1fr;
        gap: 10px;
      }
    }
    .panel {
      background: #ffffff;
      border-radius: 12px;
      padding: 12px 10px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
    }
    .panel.correct {
      border: 2px solid #22c55e;
      background: linear-gradient(180deg, #f0fdf4 0%, #ffffff 40%);
    }
    .panel.danger {
      border: 2px solid #ef4444;
      background: linear-gradient(180deg, #fef2f2 0%, #ffffff 40%);
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 5px;
      font-size: 13px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
      text-transform: uppercase;
      letter-spacing: 0.3px;
    }
    .badge.correct {
      background: #22c55e;
      color: #ffffff;
    }
    .badge.danger {
      background: #ef4444;
      color: #ffffff;
    }
    .svg-container {
      width: 100%;
      height: 190px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-top: 4px;
    }
    svg {
      width: 100%;
      height: 100%;
      overflow: visible;
    }
    .caption {
      font-size: 13px;
      font-weight: 600;
      margin-top: 2px;
      text-align: center;
    }
    .caption.correct { color: #15803d; }
    .caption.danger { color: #b91c1c; }

    /* Keyframe Animations */
    @keyframes dropFall {
      0% { transform: translateY(0); opacity: 0; }
      15% { opacity: 1; }
      60% { transform: translateY(52px); opacity: 1; }
      75% { transform: translateY(58px); opacity: 0; }
      100% { transform: translateY(58px); opacity: 0; }
    }
    @keyframes rippleSafe {
      0%, 55% { transform: scale(0.4); opacity: 0; }
      65% { opacity: 0.8; }
      100% { transform: scale(1.4); opacity: 0; }
    }
    @keyframes pourWater {
      0%, 100% { opacity: 0.3; }
      50% { opacity: 0.9; }
    }
    @keyframes violentSplatter {
      0%, 40% { transform: translate(0, 0) scale(0.3); opacity: 0; }
      55% { opacity: 1; }
      85% { opacity: 1; }
      100% { transform: translate(var(--tx), var(--ty)) scale(1.2); opacity: 0; }
    }
    @keyframes steamRise {
      0%, 30% { transform: translateY(0) scale(0.6); opacity: 0; }
      60% { opacity: 0.7; }
      100% { transform: translateY(-30px) scale(1.3); opacity: 0; }
    }

    .drop-anim {
      animation: dropFall 2.6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    }
    .ripple-anim {
      transform-origin: 100px 145px;
      animation: rippleSafe 2.6s ease-out infinite;
    }
    .stream-anim {
      animation: pourWater 2.6s ease-in-out infinite;
    }
    .steam-anim-1 {
      transform-origin: 90px 130px;
      animation: steamRise 2.6s ease-out infinite;
      animation-delay: 0.4s;
    }
    .steam-anim-2 {
      transform-origin: 110px 130px;
      animation: steamRise 2.6s ease-out infinite;
      animation-delay: 0.6s;
    }
    .sp-1 { --tx: -28px; --ty: -45px; animation: violentSplatter 2.6s cubic-bezier(0.1, 0.8, 0.3, 1) infinite; animation-delay: 0.4s; }
    .sp-2 { --tx: 30px; --ty: -40px; animation: violentSplatter 2.6s cubic-bezier(0.1, 0.8, 0.3, 1) infinite; animation-delay: 0.45s; }
    .sp-3 { --tx: -12px; --ty: -55px; animation: violentSplatter 2.6s cubic-bezier(0.1, 0.8, 0.3, 1) infinite; animation-delay: 0.5s; }
    .sp-4 { --tx: 18px; --ty: -52px; animation: violentSplatter 2.6s cubic-bezier(0.1, 0.8, 0.3, 1) infinite; animation-delay: 0.42s; }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="panel correct">
      <div class="badge correct">✓ AA: Acid to Water</div>
      <div class="svg-container">
        <svg viewBox="0 0 200 200">
          
          <g>
            <path d="M96 20 L104 20 L104 55 L99 75 L96 75 Z" fill="#94a3b8" opacity="0.3" stroke="#64748b" stroke-width="1.5"/>
            <rect x="94" y="10" width="12" height="12" rx="3" fill="#f59e0b"/>
            
            <path d="M97 40 L103 40 L103 55 L98 72 L97 72 Z" fill="#f59e0b"/>
          </g>

          
          <g class="drop-anim">
            <path d="M100 80 C98 84 96 87 96 90 A4 4 0 0 0 104 90 C104 87 102 84 100 80 Z" fill="#f59e0b"/>
          </g>

          
          <path d="M60 95 L60 170 A10 10 0 0 0 70 180 L130 180 A10 10 0 0 0 140 170 L140 95" fill="none" stroke="#334155" stroke-width="2.5" stroke-linecap="round"/>
          <path d="M55 95 L145 95" stroke="#334155" stroke-width="2.5" stroke-linecap="round"/>

          
          <path d="M62 115 L62 170 A8 8 0 0 0 70 178 L130 178 A8 8 0 0 0 138 170 L138 115 Z" fill="#38bdf8" opacity="0.45"/>
          <line x1="63" y1="115" x2="137" y2="115" stroke="#0284c7" stroke-width="2"/>

          
          <line x1="130" y1="130" x2="138" y2="130" stroke="#64748b" stroke-width="1.5"/>
          <line x1="125" y1="145" x2="138" y2="145" stroke="#64748b" stroke-width="1.5"/>
          <line x1="130" y1="160" x2="138" y2="160" stroke="#64748b" stroke-width="1.5"/>

          
          <g class="ripple-anim">
            <ellipse cx="100" cy="145" rx="28" ry="12" fill="none" stroke="#22c55e" stroke-width="2" stroke-dasharray="3 3"/>
          </g>

          
          <text x="100" y="150" fill="#0369a1" font-size="11" font-weight="700" text-anchor="middle">Water</text>
        </svg>
      </div>
      <div class="caption correct">Safe: Heat Absorbed</div>
    </div>

    
    <div class="panel danger">
      <div class="badge danger">✗ Water to Acid</div>
      <div class="svg-container">
        <svg viewBox="0 0 200 200">
          
          <path d="M85 30 Q96 45 99 128" fill="none" stroke="#38bdf8" stroke-width="3" stroke-linecap="round" class="stream-anim"/>
          
          <path d="M70 20 L85 30 L95 22" fill="none" stroke="#64748b" stroke-width="2"/>

          
          <path d="M60 95 L60 170 A10 10 0 0 0 70 180 L130 180 A10 10 0 0 0 140 170 L140 95" fill="none" stroke="#334155" stroke-width="2.5" stroke-linecap="round"/>
          <path d="M55 95 L145 95" stroke="#334155" stroke-width="2.5" stroke-linecap="round"/>

          
          <path d="M62 135 L62 170 A8 8 0 0 0 70 178 L130 178 A8 8 0 0 0 138 170 L138 135 Z" fill="#f59e0b" opacity="0.6"/>
          <line x1="63" y1="135" x2="137" y2="135" stroke="#d97706" stroke-width="2"/>

          
          <line x1="130" y1="145" x2="138" y2="145" stroke="#64748b" stroke-width="1.5"/>
          <line x1="130" y1="160" x2="138" y2="160" stroke="#64748b" stroke-width="1.5"/>

          
          <g class="steam-anim-1">
            <path d="M90 120 Q85 105 92 95 Q98 105 92 120" fill="none" stroke="#ef4444" stroke-width="2" opacity="0.7"/>
          </g>
          <g class="steam-anim-2">
            <path d="M108 120 Q115 105 108 95 Q102 105 108 120" fill="none" stroke="#ef4444" stroke-width="2" opacity="0.7"/>
          </g>

          
          <circle cx="100" cy="130" r="3.5" fill="#ef4444" class="sp-1"/>
          <circle cx="100" cy="130" r="4" fill="#f59e0b" class="sp-2"/>
          <circle cx="100" cy="130" r="3" fill="#ef4444" class="sp-3"/>
          <circle cx="100" cy="130" r="3.5" fill="#f59e0b" class="sp-4"/>

          
          <path d="M93 130 L100 120 L107 130 L102 130 L106 138 L97 132 Z" fill="#ef4444" opacity="0.8"/>

          
          <text x="100" y="162" fill="#92400e" font-size="11" font-weight="700" text-anchor="middle">Acid</text>
        </svg>
      </div>
      <div class="caption danger">Danger: Splatter & Steam</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">
  <title>Yeast Enzyme Protocol Timeline</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      width: 100%;
      min-height: 100%;
      background: #f8fafc;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

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

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

    .step-tab {
      flex: 1;
      border: 1px solid #e2e8f0;
      background: #ffffff;
      padding: 6px 4px;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
      color: #64748b;
      cursor: pointer;
      text-align: center;
      transition: all 0.25s ease;
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    }

    .step-tab.active {
      background: #22b7ff;
      color: #ffffff;
      border-color: #22b7ff;
      box-shadow: 0 2px 8px rgba(34, 183, 255, 0.3);
    }

    .btn-play {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      width: 34px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 14px;
      color: #1e2945;
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    }

    /* Grid Layout */
    .timeline-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px;
      flex: 1;
    }

    @media (min-width: 620px) {
      .timeline-grid {
        grid-template-columns: repeat(4, 1fr);
      }
    }

    /* Step Card */
    .step-card {
      background: #ffffff;
      border: 1.5px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      cursor: pointer;
      transition: all 0.25s ease;
      position: relative;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
    }

    .step-card.active {
      border-color: #22b7ff;
      box-shadow: 0 0 0 2px rgba(34, 183, 255, 0.25), 0 4px 12px rgba(34, 183, 255, 0.12);
      background: #f0f9ff;
    }

    /* Card Header */
    .card-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .step-num {
      font-size: 12px;
      font-weight: 700;
      color: #64748b;
    }

    .step-card.active .step-num {
      color: #0284c7;
    }

    .badge {
      font-size: 11px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.3px;
      padding: 2px 6px;
      border-radius: 6px;
      background: #f1f5f9;
      color: #475569;
    }

    .step-card.active .badge {
      background: #bae6fd;
      color: #0369a1;
    }

    /* Visual Stage */
    .visual-stage {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      background: #ffffff;
      border: 1px solid #f1f5f9;
      border-radius: 8px;
      padding: 8px 4px;
      min-height: 140px;
      position: relative;
    }

    .step-card.active .visual-stage {
      border-color: #e0f2fe;
    }

    /* Step 1 Visual: Scale */
    .scale-box {
      width: 84px;
      height: 72px;
      background: #f8fafc;
      border: 2px solid #cbd5e1;
      border-radius: 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 6px 4px;
      position: relative;
    }

    .weigh-dish {
      width: 48px;
      height: 12px;
      border: 2px solid #94a3b8;
      border-top: none;
      border-radius: 0 0 10px 10px;
      background: #fed7aa;
      position: relative;
    }

    .powder {
      position: absolute;
      top: -3px;
      left: 6px;
      right: 6px;
      height: 6px;
      background: #f59e0b;
      border-radius: 4px 4px 0 0;
    }

    .lcd-display {
      background: #0f172a;
      color: #38bdf8;
      font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
      font-size: 13px;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 4px;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .tare-pill {
      font-size: 9px;
      background: #16a34a;
      color: #fff;
      padding: 1px 4px;
      border-radius: 4px;
      font-weight: 600;
    }

    /* Step 2 Visual: Cylinder & Swirl */
    .cylinder-swirl-wrap {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .cylinder {
      width: 22px;
      height: 80px;
      border: 2px solid #94a3b8;
      border-top: none;
      border-radius: 0 0 4px 4px;
      position: relative;
      background: rgba(241, 245, 249, 0.5);
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
    }

    .meniscus-liquid {
      width: 100%;
      height: 44px;
      background: rgba(34, 183, 255, 0.25);
      position: relative;
      border-radius: 0 0 2px 2px;
    }

    .meniscus-line {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 6px;
      border-bottom: 2px solid #0284c7;
      border-radius: 50%;
    }

    .tick-marks {
      position: absolute;
      left: 2px;
      top: 10px;
      bottom: 10px;
      width: 4px;
      border-left: 2px dashed #94a3b8;
    }

    .timer-pill {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 2px;
      font-size: 11px;
      font-weight: 700;
      color: #475569;
    }

    .timer-icon {
      font-size: 20px;
    }

    /* Step 3 Visual: Water Bath / Temp */
    .thermo-wrap {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      width: 100%;
    }

    .thermo-gauge {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .thermo-tube {
      width: 10px;
      height: 60px;
      background: #e2e8f0;
      border-radius: 6px;
      position: relative;
      overflow: hidden;
      border: 1.5px solid #cbd5e1;
    }

    .thermo-mercury {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 70%;
      background: #ef4444;
      border-radius: 0 0 4px 4px;
    }

    .temp-val {
      font-size: 15px;
      font-weight: 800;
      color: #ef4444;
    }

    .progress-bar-wrap {
      width: 80%;
      height: 6px;
      background: #e2e8f0;
      border-radius: 4px;
      overflow: hidden;
    }

    .progress-bar-fill {
      width: 100%;
      height: 100%;
      background: #22b7ff;
    }

    .timer-sub {
      font-size: 11px;
      font-weight: 700;
      color: #64748b;
    }

    /* Step 4 Visual: Split Path */
    .split-tree {
      display: flex;
      flex-direction: column;
      gap: 6px;
      width: 100%;
      padding: 0 4px;
    }

    .branch {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 4px 6px;
      border-radius: 6px;
      font-size: 11px;
      font-weight: 600;
    }

    .branch-yes {
      background: #ecfdf5;
      border: 1px solid #a7f3d0;
      color: #065f46;
    }

    .branch-no {
      background: #fef2f2;
      border: 1px solid #fecaca;
      color: #991b1b;
    }

    .branch-icon {
      font-size: 12px;
    }

    /* Bottom Info Indicator */
    .footer-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
      padding: 4px 6px;
    }

    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      color: #0284c7;
    }
  </style>
</head>
<body>

  
  <div class="controls">
    <div class="nav-tabs">
      <button class="step-tab active" data-step="0">1</button>
      <button class="step-tab" data-step="1">2</button>
      <button class="step-tab" data-step="2">3</button>
      <button class="step-tab" data-step="3">4</button>
    </div>
    <button class="btn-play" id="playBtn" aria-label="Toggle autoplay">⏸</button>
  </div>

  
  <div class="timeline-grid">

    
    <div class="step-card active" data-step="0">
      <div class="card-header">
        <span class="step-num">STEP 1</span>
        <span class="badge">Mass</span>
      </div>
      <div class="visual-stage">
        <div class="scale-box">
          <div class="weigh-dish">
            <div class="powder"></div>
          </div>
          <div class="lcd-display">2.00 g</div>
        </div>
        <span class="tare-pill" style="margin-top: 6px;">TARE ACTIVE</span>
      </div>
    </div>

    
    <div class="step-card" data-step="1">
      <div class="card-header">
        <span class="step-num">STEP 2</span>
        <span class="badge">Vol / Time</span>
      </div>
      <div class="visual-stage">
        <div class="cylinder-swirl-wrap">
          <div class="cylinder">
            <div class="tick-marks"></div>
            <div class="meniscus-liquid">
              <div class="meniscus-line"></div>
            </div>
          </div>
          <div class="timer-pill">
            <span style="font-size: 12px; color: #0284c7;">20.0 mL</span>
            <span class="timer-icon">⏱</span>
            <span>60 s</span>
          </div>
        </div>
      </div>
    </div>

    
    <div class="step-card" data-step="2">
      <div class="card-header">
        <span class="step-num">STEP 3</span>
        <span class="badge">Temp / Time</span>
      </div>
      <div class="visual-stage">
        <div class="thermo-wrap">
          <div class="thermo-gauge">
            <div class="thermo-tube">
              <div class="thermo-mercury"></div>
            </div>
            <span class="temp-val">37°C</span>
          </div>
          <div class="progress-bar-wrap">
            <div class="progress-bar-fill"></div>
          </div>
          <span class="timer-sub">5:00 min</span>
        </div>
      </div>
    </div>

    
    <div class="step-card" data-step="3">
      <div class="card-header">
        <span class="step-num">STEP 4</span>
        <span class="badge">Conditional</span>
      </div>
      <div class="visual-stage">
        <div class="split-tree">
          <div class="branch branch-yes">
            <span>🫧 Bubbles</span>
            <span>→ 0°C Bath</span>
          </div>
          <div class="branch branch-no">
            <span>🚫 None</span>
            <span>→ +1.0 mL</span>
          </div>
        </div>
      </div>
    </div>

  </div>

  <div class="footer-bar">
    <span>4-Step Yeast Enzyme Protocol</span>
    <span class="status-badge" id="stepInfo">Step 1: Weigh Reagent</span>
  </div>

  <script src="{{VENDOR_CDN}}/classace-diagram.js"></script>
  <script>
    const stepDescriptions = [
      "Step 1: Weigh Reagent",
      "Step 2: Hydrate & Swirl",
      "Step 3: Incubate at 37°C",
      "Step 4: Check Reaction Path"
    ];

    const cards = document.querySelectorAll('.step-card');
    const tabs = document.querySelectorAll('.step-tab');
    const playBtn = document.getElementById('playBtn');
    const stepInfo = document.getElementById('stepInfo');

    let currentStep = 0;
    let isPlaying = true;
    let timer = null;

    function setStep(idx) {
      currentStep = idx;
      cards.forEach((c, i) => c.classList.toggle('active', i === idx));
      tabs.forEach((t, i) => t.classList.toggle('active', i === idx));
      if (stepInfo) {
        stepInfo.textContent = stepDescriptions[idx];
      }
    }

    function nextStep() {
      setStep((currentStep + 1) % 4);
    }

    function startAutoPlay() {
      if (timer) clearInterval(timer);
      timer = setInterval(nextStep, 3500);
      isPlaying = true;
      playBtn.textContent = '⏸';
    }

    function pauseAutoPlay() {
      if (timer) clearInterval(timer);
      isPlaying = false;
      playBtn.textContent = '▶';
    }

    playBtn.addEventListener('click', () => {
      if (isPlaying) {
        pauseAutoPlay();
      } else {
        startAutoPlay();
      }
    });

    cards.forEach((card, idx) => {
      card.addEventListener('click', () => {
        setStep(idx);
        pauseAutoPlay();
      });
    });

    tabs.forEach((tab, idx) => {
      tab.addEventListener('click', () => {
        setStep(idx);
        pauseAutoPlay();
      });
    });

    // Start auto-cycling
    startAutoPlay();
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="1:1">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      background: #f8fafc;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      min-height: 100%;
    }

    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      width: 100%;
      max-width: 560px;
      margin: 0 auto;
    }

    .proto-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      padding: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      min-height: 145px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      cursor: pointer;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      user-select: none;
    }

    .proto-card:hover, .proto-card.active {
      border-color: #2563eb;
      box-shadow: 0 0 0 1px #2563eb, 0 4px 12px rgba(37,99,235,0.08);
    }

    .card-title {
      font-size: 13px;
      font-weight: 700;
      color: #1e2945;
      letter-spacing: 0.2px;
      text-transform: uppercase;
      display: flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 4px;
    }

    .card-title .badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 18px;
      height: 18px;
      background: #eff6ff;
      color: #2563eb;
      border-radius: 50%;
      font-size: 10px;
      font-weight: 800;
    }

    .viz-area {
      width: 100%;
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    /* 1. SEQUENCE */
    .seq-row {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      width: 100%;
    }
    .seq-node {
      width: 28px;
      height: 28px;
      border-radius: 8px;
      background: #eff6ff;
      border: 1.5px solid #2563eb;
      color: #2563eb;
      font-weight: 700;
      font-size: 13px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background 0.3s ease, color 0.3s ease;
    }
    .seq-node.lit {
      background: #2563eb;
      color: #ffffff;
    }
    .seq-arrow {
      color: #94a3b8;
      font-size: 14px;
      font-weight: bold;
    }

    /* 2. MEASUREMENTS */
    .meas-wrap {
      display: flex;
      align-items: center;
      justify-content: space-evenly;
      width: 100%;
      gap: 8px;
    }
    .scale-box {
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      padding: 4px 6px;
      display: flex;
      flex-direction: column;
      align-items: center;
    }
    .scale-pan {
      width: 32px;
      height: 3px;
      background: #94a3b8;
      border-radius: 2px;
      margin-bottom: 3px;
    }
    .scale-readout {
      background: #ffffff;
      border: 1px solid #94a3b8;
      border-radius: 4px;
      font-family: ui-monospace, SFMono-Regular, monospace;
      font-size: 11px;
      font-weight: 700;
      color: #0f172a;
      padding: 1px 4px;
    }
    .cyl-wrap {
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .cylinder {
      width: 16px;
      height: 48px;
      border: 1.5px solid #64748b;
      border-top: none;
      border-radius: 0 0 4px 4px;
      position: relative;
      background: #ffffff;
      overflow: hidden;
    }
    .cyl-liquid {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 65%;
      background: #60a5fa;
      border-top: 1.5px solid #2563eb;
    }
    .cyl-marks {
      position: absolute;
      right: 1px;
      top: 6px;
      bottom: 6px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .cyl-mark {
      width: 4px;
      height: 1px;
      background: #64748b;
    }
    .cyl-label {
      font-family: ui-monospace, SFMono-Regular, monospace;
      font-size: 11px;
      font-weight: 700;
      color: #0f172a;
    }

    /* 3. PARAMETERS */
    .param-wrap {
      display: flex;
      align-items: center;
      justify-content: space-evenly;
      width: 100%;
      gap: 8px;
    }
    .thermo-group {
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .thermo {
      width: 8px;
      height: 44px;
      background: #e2e8f0;
      border-radius: 4px 4px 0 0;
      position: relative;
      border: 1px solid #cbd5e1;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      align-items: center;
    }
    .thermo-bulb {
      width: 14px;
      height: 14px;
      background: #ef4444;
      border-radius: 50%;
      margin-top: -4px;
      border: 1px solid #dc2626;
      z-index: 2;
    }
    .thermo-fill {
      width: 4px;
      height: 28px;
      background: #ef4444;
      border-radius: 2px 2px 0 0;
    }
    .timer-badge {
      display: flex;
      align-items: center;
      gap: 4px;
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 4px 8px;
    }
    .param-val {
      font-family: ui-monospace, SFMono-Regular, monospace;
      font-size: 11px;
      font-weight: 700;
      color: #0f172a;
    }

    /* 4. CONDITIONALS */
    .cond-flow {
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100%;
      gap: 4px;
    }
    .diamond {
      background: #fef3c7;
      border: 1.5px solid #d97706;
      color: #92400e;
      font-size: 10.5px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 6px;
      text-align: center;
      white-space: nowrap;
    }
    .branches {
      display: flex;
      justify-content: space-between;
      width: 100%;
      gap: 6px;
    }
    .branch {
      flex: 1;
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #f8fafc;
      border: 1px dashed #cbd5e1;
      border-radius: 6px;
      padding: 3px 2px;
      text-align: center;
    }
    .branch-tag {
      font-size: 9.5px;
      font-weight: 800;
      margin-bottom: 2px;
    }
    .tag-yes { color: #16a34a; }
    .tag-no { color: #dc2626; }
    .branch-act {
      font-size: 10px;
      font-weight: 600;
      color: #1e2945;
    }
  </style>
</head>
<body>

  <div class="grid">
    
    <div class="proto-card" id="cardSeq">
      <div class="card-title">
        <span class="badge">1</span> Sequence
      </div>
      <div class="viz-area">
        <div class="seq-row">
          <div class="seq-node" id="n1">1</div>
          <span class="seq-arrow">→</span>
          <div class="seq-node" id="n2">2</div>
          <span class="seq-arrow">→</span>
          <div class="seq-node" id="n3">3</div>
        </div>
      </div>
    </div>

    
    <div class="proto-card" id="cardMeas">
      <div class="card-title">
        <span class="badge">2</span> Measurements
      </div>
      <div class="viz-area">
        <div class="meas-wrap">
          <div class="scale-box">
            <div class="scale-pan"></div>
            <div class="scale-readout">2.50 g</div>
          </div>
          <div class="cyl-wrap">
            <div class="cylinder">
              <div class="cyl-liquid"></div>
              <div class="cyl-marks">
                <div class="cyl-mark"></div>
                <div class="cyl-mark"></div>
                <div class="cyl-mark"></div>
              </div>
            </div>
            <div class="cyl-label">15.0 mL</div>
          </div>
        </div>
      </div>
    </div>

    
    <div class="proto-card" id="cardParam">
      <div class="card-title">
        <span class="badge">3</span> Parameters
      </div>
      <div class="viz-area">
        <div class="param-wrap">
          <div class="thermo-group">
            <div style="display: flex; flex-direction: column; align-items: center;">
              <div class="thermo">
                <div class="thermo-fill"></div>
              </div>
              <div class="thermo-bulb"></div>
            </div>
            <span class="param-val">37°C</span>
          </div>
          <div class="timer-badge">
            <span style="font-size: 11px;">⏱</span>
            <span class="param-val">5:00 min</span>
          </div>
        </div>
      </div>
    </div>

    
    <div class="proto-card" id="cardCond">
      <div class="card-title">
        <span class="badge">4</span> Conditionals
      </div>
      <div class="viz-area">
        <div class="cond-flow">
          <div class="diamond">Precipitate?</div>
          <div class="branches">
            <div class="branch">
              <span class="branch-tag tag-yes">YES →</span>
              <span class="branch-act">Centrifuge</span>
            </div>
            <div class="branch">
              <span class="branch-tag tag-no">NO →</span>
              <span class="branch-act">Heat 2 min</span>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>

  <script>
    // Gentle pedagogical cycling of steps 1 -> 2 -> 3 in sequence box
    const nodes = [document.getElementById('n1'), document.getElementById('n2'), document.getElementById('n3')];
    let step = 0;
    
    function cycleSequence() {
      nodes.forEach((n, idx) => {
        if (idx === step) {
          n.classList.add('lit');
        } else {
          n.classList.remove('lit');
        }
      });
      step = (step + 1) % nodes.length;
    }

    cycleSequence();
    setInterval(cycleSequence, 1200);

    // Interactive card focus
    const cards = document.querySelectorAll('.proto-card');
    cards.forEach(card => {
      card.addEventListener('click', () => {
        cards.forEach(c => c.classList.remove('active'));
        card.classList.add('active');
      });
    });
  </script>
</body>
</html>

OGE.9.RI.9

Aligned learning resources

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