:root{--primary-color: #0d6efd;--light-gray: #f8f9fa;--medium-gray: #e9ecef;--dark-gray: #495057;--text-color: #212529;--success-color: #198754;--success-bg: #d1e7dd;--danger-color: #dc3545}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--light-gray);color:var(--text-color);margin:0;padding:1rem}.calculator-container{width:100%;max-width:500px;margin:1rem auto;background-color:#fff;border-radius:16px;box-shadow:0 4px 20px #00000012;padding:1.5rem;box-sizing:border-box}h1,h2,h3,h4{text-align:center;color:var(--primary-color);margin:0}h1{font-size:1.75rem;margin-bottom:1.5rem}h2{font-size:1.5rem;margin-top:2rem;margin-bottom:1rem;color:var(--dark-gray)}h3{font-size:1.25rem;margin-bottom:1rem;display:flex;align-items:center;justify-content:center;gap:.5rem}h4{font-size:1.1rem;text-align:left;margin-bottom:.75rem}.panel{background-color:#fff;border:1px solid var(--medium-gray);border-radius:12px;padding:1rem;margin-bottom:1.5rem}.compact-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.input-group{display:flex;flex-direction:column}.full-width{grid-column:1 / -1}.input-group label{margin-bottom:.4rem;font-weight:500;color:var(--dark-gray);font-size:.9rem}.input-group input{width:100%;padding:.8rem;border:1px solid #ced4da;border-radius:8px;font-size:1rem;box-sizing:border-box;-webkit-appearance:none;-moz-appearance:textfield}.input-group input:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #0d6efd40}.calculate-button{width:100%;padding:1rem;font-size:1.2rem;font-weight:700;color:#fff;background-color:var(--primary-color);border:none;border-radius:8px;cursor:pointer;transition:all .2s ease}.calculate-button:active{transform:scale(.98);background-color:#0b5ed7}.error-message,.results-panel{margin-top:1.5rem}.error-message{color:var(--danger-color);text-align:center;font-weight:500}.results-panel{border-top:2px solid var(--primary-color);padding-top:1.5rem}.result-grid{display:grid;grid-template-columns:1fr;gap:1rem;margin-bottom:1rem}.result-section{background-color:var(--light-gray);border-radius:8px;padding:1rem}.result-section p{margin:.75rem 0;display:flex;justify-content:space-between;align-items:center}.result-section p strong{font-family:Courier New,Courier,monospace;color:var(--success-color);background-color:var(--success-bg);padding:.2rem .5rem;border-radius:4px;font-size:1.1rem}.weight-grid-results{display:grid;grid-template-columns:1fr;gap:.75rem}.steps-toggle-container{margin:2rem 0 1rem;text-align:center}.steps-toggle-button{background-color:#6c757d;color:#fff;border:none;padding:.6rem 1.2rem;border-radius:20px;cursor:pointer;font-size:.9rem;transition:all .2s ease}.steps-toggle-button:hover{background-color:#5a6268}.calculation-steps{display:grid;grid-template-columns:1fr;gap:1.5rem;max-height:0;overflow:hidden;opacity:0;transition:all .5s ease-in-out;padding:0 .5rem}.calculation-steps.show{max-height:2000px;opacity:1;padding-top:1rem}.step-column ul{list-style-type:none;padding-left:0;margin:0}.step-column li{background-color:#fff;border:1px solid var(--medium-gray);padding:.75rem;border-radius:4px;margin-bottom:.75rem;font-family:Courier New,Courier,monospace;font-size:.85rem;white-space:pre-wrap;word-wrap:break-word;line-height:1.5}@media (min-width: 768px){.calculator-container{max-width:800px;padding:2.5rem}.compact-grid{grid-template-columns:repeat(3,1fr)}.result-grid{grid-template-columns:1fr 1fr}.weight-grid-results,.calculation-steps{grid-template-columns:repeat(3,1fr)}}