:root{--primary: #0f766e;--primary-dark: #115e59;--primary-light: #14b8a6;--accent: #b45309;--bg: #f6f7fb;--surface: #ffffff;--surface-alt: #f8fafc;--border: #e2e8f0;--border-light: #f1f5f9;--text: #1a202c;--text-secondary: #475569;--text-muted: #94a3b8;--success: #059669;--success-bg: #ecfdf5;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", monospace;--radius-sm: 8px;--radius: 12px;--radius-lg: 16px;--shadow-sm: 0 1px 2px rgba(15, 23, 42, .05);--shadow: 0 2px 12px rgba(15, 23, 42, .07);--shadow-lg: 0 8px 30px rgba(15, 23, 42, .1)}*{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background:var(--bg);color:var(--text);line-height:1.65}.container{max-width:1080px;margin:0 auto;padding:0 20px}.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;box-shadow:var(--shadow-sm)}.header-inner{max-width:1080px;margin:0 auto;padding:0 20px;height:62px;display:flex;align-items:center;justify-content:space-between;gap:20px}.logo{font-size:1.3rem;font-weight:800;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:8px;white-space:nowrap}.logo .logo-mark{width:30px;height:30px;background:linear-gradient(135deg,var(--primary),var(--primary-light));border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:1rem;font-weight:800}.logo span.brand-accent{color:var(--primary)}.main-nav{display:flex;gap:4px;align-items:center;overflow-x:auto;scrollbar-width:none}.main-nav::-webkit-scrollbar{display:none}.main-nav a{color:var(--text-secondary);text-decoration:none;font-size:.9rem;font-weight:500;padding:7px 13px;border-radius:8px;white-space:nowrap;transition:all .15s}.main-nav a:hover{color:var(--primary);background:var(--surface-alt)}.main-nav a.active{color:var(--primary);background:#f0fdfa;font-weight:600}.page-head{padding:40px 0 28px}.page-head h1{font-size:2.1rem;font-weight:800;letter-spacing:-.02em;margin-bottom:8px}.page-head .subtitle{font-size:1.05rem;color:var(--text-secondary);max-width:640px}.breadcrumb{font-size:.82rem;color:var(--text-muted);margin-bottom:14px}.breadcrumb a{color:var(--text-muted);text-decoration:none}.breadcrumb a:hover{color:var(--primary)}.breadcrumb .sep{margin:0 6px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow)}.calc-shell{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:28px;margin-bottom:32px}.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px}@media (max-width: 720px){.calc-grid{grid-template-columns:1fr}.calc-shell{padding:20px}}.field{margin-bottom:18px}.field label{display:block;font-size:.86rem;font-weight:600;color:var(--text-secondary);margin-bottom:6px}.field input[type=number],.field input[type=text],.field input[type=date],.field select,.field textarea{width:100%;padding:11px 14px;font-size:1rem;font-family:var(--font-sans);color:var(--text);background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius-sm);transition:border-color .15s,box-shadow .15s;-webkit-appearance:none;appearance:none}.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--primary-light);box-shadow:0 0 0 3px #14b8a626}.field .hint{font-size:.78rem;color:var(--text-muted);margin-top:4px}.input-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}@media (max-width: 480px){.input-row{grid-template-columns:1fr}}.input-affix{position:relative}.input-affix .prefix,.input-affix .suffix{position:absolute;top:50%;transform:translateY(-50%);color:var(--text-muted);font-size:.95rem;pointer-events:none}.input-affix .prefix{left:14px}.input-affix .suffix{right:14px}.input-affix.has-prefix input{padding-left:30px}.input-affix.has-suffix input{padding-right:44px}.result-panel{background:linear-gradient(135deg,#f0fdfa,#ecfdf5);border:1px solid #99f6e4;border-radius:var(--radius);padding:24px}.result-main{text-align:center;padding-bottom:16px;border-bottom:1px dashed #99f6e4;margin-bottom:16px}.result-main .result-label{font-size:.82rem;font-weight:600;color:var(--primary-dark);text-transform:uppercase;letter-spacing:.04em}.result-main .result-value{font-size:2.4rem;font-weight:800;color:var(--primary-dark);line-height:1.2;word-break:break-word}.result-main .result-sub{font-size:.88rem;color:var(--text-secondary);margin-top:4px}.result-rows{display:flex;flex-direction:column;gap:10px}.result-row{display:flex;justify-content:space-between;align-items:center;font-size:.92rem}.result-row .rr-label{color:var(--text-secondary)}.result-row .rr-value{font-weight:700;color:var(--text);font-variant-numeric:tabular-nums}.result-placeholder{text-align:center;color:var(--text-muted);font-size:.95rem;padding:40px 10px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 22px;font-size:.95rem;font-weight:600;font-family:var(--font-sans);border:none;border-radius:var(--radius-sm);cursor:pointer;transition:all .15s;text-decoration:none}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}.btn-ghost{background:var(--surface-alt);color:var(--text-secondary);border:1px solid var(--border)}.btn-ghost:hover{background:var(--border-light);color:var(--text)}.segmented{display:inline-flex;background:var(--surface-alt);border:1px solid var(--border);border-radius:var(--radius-sm);padding:3px;gap:3px}.segmented button{border:none;background:transparent;padding:7px 16px;font-size:.85rem;font-weight:600;font-family:var(--font-sans);color:var(--text-secondary);border-radius:6px;cursor:pointer;transition:all .15s}.segmented button.active{background:var(--surface);color:var(--primary);box-shadow:var(--shadow-sm)}.content-section{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow);padding:32px;margin-bottom:28px}.content-section h2{font-size:1.45rem;font-weight:700;margin-bottom:14px;letter-spacing:-.01em}.content-section h3{font-size:1.1rem;font-weight:650;margin:22px 0 8px;color:var(--text)}.content-section p{color:var(--text-secondary);margin-bottom:12px;font-size:.97rem}.content-section ul,.content-section ol{color:var(--text-secondary);margin:0 0 14px 22px;font-size:.97rem}.content-section li{margin-bottom:6px}.content-section code{font-family:var(--font-mono);font-size:.86em;background:var(--surface-alt);border:1px solid var(--border);padding:2px 6px;border-radius:5px;color:var(--primary-dark)}.formula-box{background:var(--surface-alt);border:1px solid var(--border);border-left:4px solid var(--primary);border-radius:var(--radius-sm);padding:16px 20px;font-family:var(--font-mono);font-size:.98rem;color:var(--text);margin:14px 0;overflow-x:auto}.ref-table{width:100%;border-collapse:collapse;font-size:.9rem;margin:14px 0}.ref-table th{background:var(--surface-alt);padding:10px 14px;text-align:left;font-weight:650;color:var(--text-secondary);border-bottom:2px solid var(--border)}.ref-table td{padding:9px 14px;border-bottom:1px solid var(--border-light);color:var(--text-secondary);font-variant-numeric:tabular-nums}.ref-table tr:hover td{background:var(--surface-alt)}.faq-item{border-bottom:1px solid var(--border-light);padding:16px 0}.faq-item:last-child{border-bottom:none}.faq-item summary{font-size:.99rem;font-weight:600;color:var(--text);cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary:after{content:"+";font-size:1.3rem;font-weight:400;color:var(--primary);flex-shrink:0;transition:transform .2s}.faq-item details[open] summary:after,.faq-item[open] summary:after{content:"−"}.faq-item .faq-answer{padding-top:10px;color:var(--text-secondary);font-size:.93rem}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}@media (max-width: 720px){.related-grid{grid-template-columns:repeat(2,1fr)}}.related-card{display:flex;flex-direction:column;gap:6px;background:var(--surface-alt);border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-decoration:none;transition:all .15s}.related-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow);transform:translateY(-2px)}.related-card .rc-icon{font-size:1.4rem}.related-card .rc-title{font-size:.93rem;font-weight:650;color:var(--text)}.related-card .rc-desc{font-size:.8rem;color:var(--text-muted)}.site-footer{background:#0f172a;color:#94a3b8;margin-top:60px;padding:44px 0 28px}.footer-inner{max-width:1080px;margin:0 auto;padding:0 20px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}@media (max-width: 720px){.footer-grid{grid-template-columns:1fr 1fr}}.footer-brand .logo{color:#fff}.footer-brand p{font-size:.86rem;margin-top:10px;max-width:300px;line-height:1.6}.footer-col h4{color:#e2e8f0;font-size:.88rem;font-weight:700;margin-bottom:12px;text-transform:uppercase;letter-spacing:.04em}.footer-col a{display:block;color:#94a3b8;text-decoration:none;font-size:.88rem;padding:4px 0;transition:color .15s}.footer-col a:hover{color:#5eead4}.footer-bottom{border-top:1px solid #1e293b;padding-top:22px;font-size:.82rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}.ad-container{margin:28px auto;text-align:center;min-height:90px;max-width:100%;overflow:hidden}.ad-container ins.adsbygoogle{display:block;margin:0 auto}.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}@media (max-width: 820px){.tool-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width: 520px){.tool-grid{grid-template-columns:1fr}}.tool-card{display:flex;align-items:flex-start;gap:14px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;text-decoration:none;transition:all .15s;box-shadow:var(--shadow-sm)}.tool-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow);transform:translateY(-2px)}.tool-card .tc-icon{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.3rem;flex-shrink:0}.tool-card .tc-title{font-size:.97rem;font-weight:650;color:var(--text)}.tool-card .tc-desc{font-size:.82rem;color:var(--text-muted);margin-top:3px;line-height:1.45}.text-muted{color:var(--text-muted)}.mt-0{margin-top:0}.text-center{text-align:center}