.ptb-calc{--ptb-primary: #4f46e5;--ptb-secondary: #6366f1;--ptb-accent: #a5b4fc;--ptb-bg: #eef2ff;--ptb-card-bg: #ffffff;--ptb-text: #312e81;--ptb-text-muted: #4338ca;--ptb-border: #c7d2fe;--ptb-shadow: 0 4px 20px rgba(79, 70, 229, .12);max-width:900px;margin:0 auto;font-family:system-ui,-apple-system,sans-serif}.ptb-header{text-align:center;margin-bottom:2rem}.ptb-title{font-size:2rem;font-weight:800;color:var(--ptb-primary);margin:0 0 .5rem}.ptb-description{color:var(--ptb-text-muted);font-size:1.1rem;margin:0}.ptb-formula-container{background:linear-gradient(135deg,var(--ptb-bg) 0%,#e0e7ff 100%);border-radius:16px;padding:1.5rem;margin-bottom:2rem;border:1px solid var(--ptb-border)}.ptb-formula-title{font-size:1.1rem;font-weight:700;color:var(--ptb-primary);margin:0 0 1rem;text-align:center}.ptb-formula-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.ptb-formula-card{background:var(--ptb-card-bg);border-radius:12px;padding:1rem;text-align:center}.ptb-formula-label{display:block;font-size:.85rem;font-weight:600;color:var(--ptb-text-muted);margin-bottom:.5rem}.ptb-formula-math{font-size:.9rem;color:var(--ptb-text);overflow-x:auto}.ptb-form-container{background:var(--ptb-card-bg);border-radius:16px;padding:1.5rem;box-shadow:var(--ptb-shadow);margin-bottom:2rem}.ptb-form{display:flex;flex-direction:column;gap:1.25rem}.ptb-input-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.ptb-input-group{display:flex;flex-direction:column;gap:.5rem}.ptb-label{font-weight:600;font-size:.9rem;color:var(--ptb-text)}.ptb-input{width:100%;padding:.875rem 1rem;border:2px solid var(--ptb-border);border-radius:10px;font-size:1rem;background:var(--ptb-bg);box-sizing:border-box}.ptb-input:focus{outline:none;border-color:var(--ptb-primary);background:#fff}.ptb-buttons{display:flex;gap:1rem;margin-top:.5rem}.ptb-btn{flex:1;padding:1rem;border:none;border-radius:10px;font-size:1rem;font-weight:700;cursor:pointer}.ptb-btn-primary{background:linear-gradient(135deg,var(--ptb-primary) 0%,var(--ptb-secondary) 100%);color:#fff}.ptb-btn-secondary{background:var(--ptb-bg);color:var(--ptb-text-muted);border:2px solid var(--ptb-border)}.ptb-results{background:var(--ptb-card-bg);border-radius:16px;padding:1.5rem;box-shadow:var(--ptb-shadow);margin-bottom:2rem}.ptb-results-title{font-size:1.25rem;font-weight:700;color:var(--ptb-primary);margin:0 0 1.5rem;text-align:center}.ptb-results-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem}.ptb-result-card{background:var(--ptb-bg);border-radius:12px;padding:1.25rem;text-align:center}.ptb-result-main{grid-column:1 / -1;background:linear-gradient(135deg,var(--ptb-primary) 0%,var(--ptb-secondary) 100%)}.ptb-result-main .ptb-result-label,.ptb-result-main .ptb-result-value{color:#fff}.ptb-result-label{display:block;font-size:.8rem;font-weight:600;color:var(--ptb-text-muted);margin-bottom:.25rem}.ptb-result-value{display:block;font-size:1.75rem;font-weight:800;color:var(--ptb-primary)}.ptb-content{margin-top:3rem}.ptb-content-section{margin-bottom:2.5rem}.ptb-content-title{font-size:1.5rem;font-weight:700;color:var(--ptb-text);margin:0 0 1rem;padding-bottom:.5rem;border-bottom:3px solid var(--ptb-primary)}.ptb-content-text{color:var(--ptb-text-muted);line-height:1.7;margin:0 0 1rem}.ptb-features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1.5rem}.ptb-feature-card{background:var(--ptb-bg);border-radius:12px;padding:1.25rem;text-align:center}.ptb-feature-icon{font-size:2rem;display:block;margin-bottom:.75rem}.ptb-feature-title{font-size:1rem;font-weight:700;color:var(--ptb-text);margin:0 0 .5rem}.ptb-feature-desc{font-size:.85rem;color:var(--ptb-text-muted);margin:0}.ptb-table-wrapper{overflow-x:auto;border-radius:12px;margin-top:1.5rem}.ptb-table{width:100%;border-collapse:collapse;background:#fff;font-size:.9rem}.ptb-table th{background:var(--ptb-primary);color:#fff;padding:.875rem 1rem;text-align:left}.ptb-table td{padding:.75rem 1rem;border-bottom:1px solid var(--ptb-border)}.ptb-table-highlight{font-weight:700;color:var(--ptb-primary)}.ptb-tips-grid{display:grid;gap:1rem;margin-top:1.5rem}.ptb-tip-card{display:flex;gap:1rem;background:var(--ptb-card-bg);border-radius:12px;padding:1.25rem;border-left:4px solid var(--ptb-primary)}.ptb-tip-icon{font-size:1.5rem}.ptb-tip-title{font-size:1rem;font-weight:700;color:var(--ptb-text);margin:0 0 .5rem}.ptb-tip-text{font-size:.9rem;color:var(--ptb-text-muted);margin:0}.ptb-faqs{display:flex;flex-direction:column;gap:1rem;margin-top:1.5rem}.ptb-faq-item{background:var(--ptb-card-bg);border-radius:12px;padding:1.25rem}.ptb-faq-question{font-size:1rem;font-weight:700;color:var(--ptb-primary);margin:0 0 .75rem}.ptb-faq-answer{font-size:.9rem;color:var(--ptb-text-muted);margin:0;line-height:1.6}@media (max-width: 768px){.ptb-input-grid{grid-template-columns:1fr}.ptb-results-grid{grid-template-columns:repeat(2,1fr)}}