.bf-calc{--bf-primary: #92400e;--bf-secondary: #b45309;--bf-accent: #fbbf24;--bf-bg: #fef7ed;--bf-card-bg: #ffffff;--bf-text: #78350f;--bf-text-muted: #a16207;--bf-border: #fed7aa;--bf-shadow: 0 4px 20px rgba(146, 64, 14, .12);max-width:900px;margin:0 auto;font-family:system-ui,-apple-system,sans-serif}.bf-header{text-align:center;margin-bottom:2rem}.bf-title{font-size:2rem;font-weight:800;color:var(--bf-primary);margin:0 0 .5rem}.bf-description{color:var(--bf-text-muted);font-size:1.1rem;margin:0}.bf-formula-container{background:linear-gradient(135deg,var(--bf-bg) 0%,#ffedd5 100%);border-radius:16px;padding:1.5rem;margin-bottom:2rem;border:1px solid var(--bf-border)}.bf-formula-title{font-size:1.1rem;font-weight:700;color:var(--bf-primary);margin:0 0 1rem;text-align:center}.bf-formula-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.bf-formula-card{background:var(--bf-card-bg);border-radius:12px;padding:1rem;text-align:center}.bf-formula-label{display:block;font-size:.85rem;font-weight:600;color:var(--bf-text-muted);margin-bottom:.5rem}.bf-formula-math{font-size:.9rem;color:var(--bf-text);overflow-x:auto}.bf-form-container{background:var(--bf-card-bg);border-radius:16px;padding:1.5rem;box-shadow:var(--bf-shadow);margin-bottom:2rem}.bf-form{display:flex;flex-direction:column;gap:1.25rem}.bf-input-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem}.bf-input-group{display:flex;flex-direction:column;gap:.5rem}.bf-label{font-weight:600;font-size:.9rem;color:var(--bf-text)}.bf-input{width:100%;padding:.875rem 1rem;border:2px solid var(--bf-border);border-radius:10px;font-size:1rem;background:var(--bf-bg);box-sizing:border-box}.bf-input:focus{outline:none;border-color:var(--bf-primary);background:#fff}.bf-input-wrapper{display:flex;gap:.5rem}.bf-input-wrapper .bf-input{flex:1}.bf-unit-select{width:60px;padding:.875rem .5rem;border:2px solid var(--bf-border);border-radius:10px;font-size:.9rem;background:var(--bf-bg)}.bf-buttons{display:flex;gap:1rem;margin-top:.5rem}.bf-btn{flex:1;padding:1rem;border:none;border-radius:10px;font-size:1rem;font-weight:700;cursor:pointer}.bf-btn-primary{background:linear-gradient(135deg,var(--bf-primary) 0%,var(--bf-secondary) 100%);color:#fff}.bf-btn-secondary{background:var(--bf-bg);color:var(--bf-text-muted);border:2px solid var(--bf-border)}.bf-results{background:var(--bf-card-bg);border-radius:16px;padding:1.5rem;box-shadow:var(--bf-shadow);margin-bottom:2rem}.bf-results-title{font-size:1.25rem;font-weight:700;color:var(--bf-primary);margin:0 0 1.5rem;text-align:center}.bf-results-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem}.bf-result-card{background:var(--bf-bg);border-radius:12px;padding:1.25rem;text-align:center}.bf-result-main{grid-column:1 / -1;background:linear-gradient(135deg,var(--bf-primary) 0%,var(--bf-secondary) 100%)}.bf-result-main .bf-result-label,.bf-result-main .bf-result-value,.bf-result-main .bf-result-unit{color:#fff}.bf-result-label{display:block;font-size:.8rem;font-weight:600;color:var(--bf-text-muted);margin-bottom:.25rem}.bf-result-value{display:block;font-size:1.75rem;font-weight:800;color:var(--bf-primary)}.bf-result-unit{display:block;font-size:.75rem;color:var(--bf-text-muted)}.bf-content{margin-top:3rem}.bf-content-section{margin-bottom:2.5rem}.bf-content-title{font-size:1.5rem;font-weight:700;color:var(--bf-text);margin:0 0 1rem;padding-bottom:.5rem;border-bottom:3px solid var(--bf-primary)}.bf-content-text{color:var(--bf-text-muted);line-height:1.7;margin:0 0 1rem}.bf-features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1.5rem}.bf-feature-card{background:var(--bf-bg);border-radius:12px;padding:1.25rem;text-align:center}.bf-feature-icon{font-size:2rem;display:block;margin-bottom:.75rem}.bf-feature-title{font-size:1rem;font-weight:700;color:var(--bf-text);margin:0 0 .5rem}.bf-feature-desc{font-size:.85rem;color:var(--bf-text-muted);margin:0}.bf-table-wrapper{overflow-x:auto;border-radius:12px;margin-top:1.5rem}.bf-table{width:100%;border-collapse:collapse;background:#fff;font-size:.9rem}.bf-table th{background:var(--bf-primary);color:#fff;padding:.875rem 1rem;text-align:left}.bf-table td{padding:.75rem 1rem;border-bottom:1px solid var(--bf-border)}.bf-table-highlight{font-weight:700;color:var(--bf-primary)}.bf-tips-grid{display:grid;gap:1rem;margin-top:1.5rem}.bf-tip-card{display:flex;gap:1rem;background:var(--bf-card-bg);border-radius:12px;padding:1.25rem;border-left:4px solid var(--bf-primary)}.bf-tip-icon{font-size:1.5rem}.bf-tip-title{font-size:1rem;font-weight:700;color:var(--bf-text);margin:0 0 .5rem}.bf-tip-text{font-size:.9rem;color:var(--bf-text-muted);margin:0}.bf-faqs{display:flex;flex-direction:column;gap:1rem;margin-top:1.5rem}.bf-faq-item{background:var(--bf-card-bg);border-radius:12px;padding:1.25rem}.bf-faq-question{font-size:1rem;font-weight:700;color:var(--bf-primary);margin:0 0 .75rem}.bf-faq-answer{font-size:.9rem;color:var(--bf-text-muted);margin:0;line-height:1.6}@media (max-width: 768px){.bf-input-grid{grid-template-columns:1fr 1fr}.bf-results-grid{grid-template-columns:1fr}}