* { box-sizing:border-box;margin:0;padding:0;font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;} body { background-color:#f5f5f5;color:#333;line-height:1.6;} .calculator-container { max-width:800px;margin:30px auto;padding:20px;background-color:#fff;border-radius:8px;box-shadow:0 2px 10px rgba(0, 0, 0, 0.1);} h1 { text-align:center;color:#2c3e50;margin-bottom:30px;padding-bottom:15px;border-bottom:2px solid #eee;} h2 { color:#3498db;margin-bottom:20px;} h3 { color:#2c3e50;margin-bottom:10px;} .step { display:none;margin-bottom:30px;} .step.active { display:block;} .options { display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px;} .option-btn { flex:1 0 calc(33.333% - 10px);min-width:200px;padding:12px 15px;background-color:#f8f9fa;border:1px solid #ddd;border-radius:4px;cursor:pointer;transition:all 0.3s ease;font-size:14px;text-align:left;} .option-btn:hover { background-color:#e9ecef;border-color:#adb5bd;} .option-btn.selected { background-color:#3498db;color:white;border-color:#2980b9;} .result-info { background-color:#f8f9fa;padding:20px;border-radius:6px;margin-top:20px;} .result-section { margin-bottom:20px;padding-bottom:15px;border-bottom:1px solid #eee;} .result-section:last-child { border-bottom:none;} .highlight { font-size:24px;font-weight:bold;color:#e74c3c;} .note, .disclaimer, .small-text { font-size:14px;color:#7f8c8d;margin-top:5px;} .disclaimer { font-style:italic;margin-top:20px;text-align:center;} .selected-info { display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;} #selected-electrode { font-weight:bold;font-size:18px;} .start-over-btn { padding:8px 15px;background-color:#e74c3c;color:white;border:none;border-radius:4px;cursor:pointer;transition:background-color 0.3s ease;} .start-over-btn:hover { background-color:#c0392b;} @media (max-width:768px) { .calculator-container { margin:15px;padding:15px;} .option-btn { flex:1 0 100%;} h1 { font-size:24px;} h2 { font-size:20px;} }