.gcf-calculator{--gcf-primary: #475569;--gcf-secondary: #64748b;--gcf-accent: #94a3b8;--gcf-bg: #f8fafc;--gcf-card-bg: #ffffff;--gcf-text: #1e293b;--gcf-text-muted: #475569;--gcf-border: #e2e8f0;--gcf-shadow: 0 4px 20px rgba(71, 85, 105, .12);max-width:900px;margin:0 auto;font-family:system-ui,-apple-system,sans-serif}.gcf-header{text-align:center;margin-bottom:2rem}.gcf-title{font-size:2rem;font-weight:800;color:var(--gcf-primary);margin:0 0 .5rem}.gcf-description{color:var(--gcf-text-muted);font-size:1.1rem;margin:0}.gcf-formula-container{background:linear-gradient(135deg,var(--gcf-bg) 0%,#e2e8f0 100%);border-radius:16px;padding:1.5rem;margin-bottom:2rem;border:1px solid var(--gcf-border)}.gcf-formula-title{font-size:1.1rem;font-weight:700;color:var(--gcf-primary);margin:0 0 1rem;text-align:center}.gcf-formula-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.gcf-formula-card{background:var(--gcf-card-bg);border-radius:12px;padding:1rem;text-align:center}.gcf-formula-label{display:block;font-size:.85rem;font-weight:600;color:var(--gcf-text-muted);margin-bottom:.5rem}.gcf-formula-math{font-size:.9rem;color:var(--gcf-text);overflow-x:auto}.gcf-form-container{background:var(--gcf-card-bg);border-radius:16px;padding:1.5rem;box-shadow:var(--gcf-shadow);margin-bottom:2rem}.gcf-form{display:flex;flex-direction:column;gap:1.25rem}.gcf-input-group{display:flex;flex-direction:column;gap:.5rem}.gcf-label{font-weight:600;font-size:.9rem;color:var(--gcf-text)}.gcf-input{width:100%;padding:.875rem 1rem;border:2px solid var(--gcf-border);border-radius:10px;font-size:1.1rem;background:var(--gcf-bg)}.gcf-input:focus{outline:none;border-color:var(--gcf-primary);background:#fff}.gcf-buttons{display:flex;gap:1rem}.gcf-btn{flex:1;padding:1rem;border:none;border-radius:10px;font-size:1rem;font-weight:700;cursor:pointer}.gcf-btn-primary{background:linear-gradient(135deg,var(--gcf-primary) 0%,var(--gcf-secondary) 100%);color:#fff}.gcf-btn-secondary{background:var(--gcf-bg);color:var(--gcf-text-muted);border:2px solid var(--gcf-border)}.gcf-results{background:var(--gcf-card-bg);border-radius:16px;padding:1.5rem;box-shadow:var(--gcf-shadow);margin-bottom:2rem}.gcf-results-title{font-size:1.25rem;font-weight:700;color:var(--gcf-primary);margin:0 0 1.5rem;text-align:center}.gcf-main-result{text-align:center;background:linear-gradient(135deg,var(--gcf-primary) 0%,var(--gcf-secondary) 100%);border-radius:16px;padding:2rem;margin-bottom:1.5rem}.gcf-main-label{display:block;font-size:.9rem;color:#ffffffe6;margin-bottom:.5rem}.gcf-main-value{font-size:3rem;font-weight:800;color:#fff}.gcf-summary-grid{display:grid;grid-template-columns:1fr;gap:1rem;margin-bottom:1.5rem}.gcf-summary-card{background:var(--gcf-bg);border-radius:12px;padding:1rem;text-align:center}.gcf-summary-label{display:block;font-size:.75rem;font-weight:600;color:var(--gcf-text-muted);margin-bottom:.25rem}.gcf-summary-value{font-size:1.25rem;font-weight:800;color:var(--gcf-text)}.gcf-factors-section,.gcf-common-section{margin-top:1.5rem}.gcf-factors-title,.gcf-common-title{font-size:1rem;font-weight:700;color:var(--gcf-text);margin:0 0 .75rem}.gcf-factors-list{display:flex;flex-direction:column;gap:.5rem}.gcf-factor-item{background:var(--gcf-bg);padding:.75rem 1rem;border-radius:8px;font-family:monospace}.gcf-factor-num{font-weight:700;color:var(--gcf-primary)}.gcf-factor-expr{color:var(--gcf-text)}.gcf-common-badges{display:flex;flex-wrap:wrap;gap:.5rem}.gcf-badge{background:var(--gcf-primary);color:#fff;padding:.5rem 1rem;border-radius:20px;font-weight:600}.gcf-content{margin-top:3rem}.gcf-content-section{margin-bottom:2.5rem}.gcf-content-title{font-size:1.5rem;font-weight:700;color:var(--gcf-text);margin:0 0 1rem;padding-bottom:.5rem;border-bottom:3px solid var(--gcf-primary)}.gcf-content-text{color:var(--gcf-text-muted);line-height:1.7;margin:0 0 1rem}.gcf-features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1.5rem}.gcf-feature-card{background:var(--gcf-bg);border-radius:12px;padding:1.25rem;text-align:center}.gcf-feature-icon{font-size:2rem;display:block;margin-bottom:.75rem}.gcf-feature-title{font-size:1rem;font-weight:700;color:var(--gcf-text);margin:0 0 .5rem}.gcf-feature-desc{font-size:.85rem;color:var(--gcf-text-muted);margin:0}.gcf-table-wrapper{overflow-x:auto;border-radius:12px;margin-top:1.5rem}.gcf-table{width:100%;border-collapse:collapse;background:#fff;font-size:.9rem}.gcf-table th{background:var(--gcf-primary);color:#fff;padding:.875rem 1rem;text-align:left}.gcf-table td{padding:.75rem 1rem;border-bottom:1px solid var(--gcf-border)}.gcf-table-nums{font-weight:700;color:var(--gcf-primary)}.gcf-tips-grid{display:grid;gap:1rem;margin-top:1.5rem}.gcf-tip-card{display:flex;gap:1rem;background:var(--gcf-card-bg);border-radius:12px;padding:1.25rem;border-left:4px solid var(--gcf-primary)}.gcf-tip-icon{font-size:1.5rem}.gcf-tip-title{font-size:1rem;font-weight:700;color:var(--gcf-text);margin:0 0 .5rem}.gcf-tip-text{font-size:.9rem;color:var(--gcf-text-muted);margin:0}.gcf-faqs{display:flex;flex-direction:column;gap:1rem;margin-top:1.5rem}.gcf-faq-item{background:var(--gcf-card-bg);border-radius:12px;padding:1.25rem}.gcf-faq-question{font-size:1rem;font-weight:700;color:var(--gcf-primary);margin:0 0 .75rem}.gcf-faq-answer{font-size:.9rem;color:var(--gcf-text-muted);margin:0;line-height:1.6}