:root{--bg:#fff;--surface:#f8fafc;--text:#0f172a;--muted:#64748b;--border:#e2e8f0;--accent:#0ea5e9;--soft:#e0f2fe}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;background:var(--surface);color:var(--text)}header{background:#fff;border-bottom:1px solid var(--border)}.header{max-width:1100px;margin:auto;padding:18px;display:flex;justify-content:space-between;align-items:center}.logo{display:flex;gap:10px;font-weight:800}.logo span{background:var(--accent);color:#fff;border-radius:8px;padding:6px 10px}.tabs a{margin-left:6px;padding:10px 16px;min-height:44px;display:inline-flex;align-items:center;border-radius:999px;border:1px solid var(--border);text-decoration:none;color:var(--muted)}.tabs a.active{background:var(--accent);color:#fff;border-color:var(--accent)}main{max-width:760px;margin:auto;padding:24px}h1{font-size:28px;font-weight:700;margin:0 0 24px 0;color:var(--text)}.card{background:#fff;border:1px solid var(--border);border-radius:16px;padding:24px;margin-bottom:32px}.inputs{display:grid;grid-template-columns:1fr 1fr;gap:16px}label{font-size:14px;color:var(--muted)}input{width:100%;padding:14px;border-radius:10px;border:1px solid var(--border);font-size:16px}.result{margin-top:18px;padding:16px;background:var(--surface);border-radius:12px;min-height:64px}.example{color:var(--muted)}.nl{font-size:20px;font-weight:600}.pill{background:var(--soft);padding:4px 10px;border-radius:999px}.faq-item{border-top:1px solid var(--border)}.faq-q{width:100%;text-align:left;background:0 0;border:none;padding:16px 0;font-weight:600;cursor:pointer}.faq-a{display:none;color:var(--muted);padding-bottom:16px}.faq-item.open .faq-a{display:block}.content{background:#fff;border:1px solid var(--border);border-radius:16px;padding:24px;margin-bottom:32px;line-height:1.7}.content h2{margin-top:0;margin-bottom:16px;font-size:22px}.content h3{margin-top:24px;margin-bottom:12px;font-size:18px}.content p{margin:0 0 16px 0;color:var(--text)}.content ol,.content ul{margin:0 0 16px 0;padding-left:24px}.content li{margin-bottom:8px}.content code{background:var(--surface);padding:2px 6px;border-radius:4px;font-size:14px}.layout{display:block}.ad-slot{margin:32px 0;text-align:center;min-height:90px}.ad-after-calculator{margin-top:24px}.ad-in-content{margin:24px 0}.sidebar-ad{display:none}@media (min-width:1200px){.layout{display:grid;grid-template-columns:1fr 300px;gap:40px;max-width:1200px;margin:0 auto;padding:0 24px}main{max-width:800px}.sidebar-ad{display:block;position:sticky;top:120px;height:fit-content;min-height:600px}}footer{background:#fff;border-top:1px solid var(--border);margin-top:48px;padding:32px 0}.footer{max-width:760px;margin:auto;padding:0 24px;text-align:center}.footer-links{display:flex;justify-content:center;flex-wrap:wrap;gap:24px;margin-bottom:16px}.footer-links a{color:var(--muted);text-decoration:none;font-size:14px;padding:12px 8px;min-height:44px;display:inline-flex;align-items:center}.footer-links a:hover{color:var(--accent)}.footer-copy{color:var(--muted);font-size:13px}.calculator-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px}.calc-card{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--border);border-radius:12px;padding:16px;text-decoration:none;color:var(--text);transition:border-color .2s,box-shadow .2s}.calc-card:hover{border-color:var(--accent);box-shadow:0 2px 8px rgba(14,165,233,.12)}.calc-card .card-icon{font-size:24px;flex-shrink:0}.calc-card .card-info{min-width:0}.calc-card .card-name{font-weight:600;font-size:15px;margin-bottom:2px}.calc-card .card-desc{font-size:13px;color:var(--muted);line-height:1.3}.inline-calcs{background:#fff;border:1px solid var(--border);border-radius:16px;padding:20px 24px;margin-bottom:24px}.inline-calcs h2{font-size:20px;margin:0 0 16px 0}.inline-row{display:flex;align-items:center;flex-wrap:wrap;gap:6px;font-size:17px;font-weight:500;padding:14px 0;border-bottom:1px solid var(--border);line-height:1.6}.inline-row:last-child{border-bottom:none;padding-bottom:4px}.inline-row .inline-label{white-space:nowrap}.inline-row input{width:72px;padding:8px 10px;border-radius:8px;border:1px solid var(--border);font-size:16px;font-weight:600;text-align:center;background:var(--surface)}.inline-row input:focus{outline:0;border-color:var(--accent);background:#fff}.inline-row .inline-result{display:inline-flex;align-items:center;gap:4px;font-weight:700;color:var(--accent);min-width:48px}.inline-row .inline-result.example-result{color:#b0bec5;font-weight:400;font-size:14px;font-style:italic}.result-actions{display:flex;gap:8px;margin-top:10px}.copy-btn,.share-btn{display:inline-flex;align-items:center;gap:4px;padding:6px 14px;border-radius:8px;border:1px solid var(--border);background:#fff;color:var(--muted);font-size:13px;cursor:pointer;transition:border-color .2s,color .2s;min-height:36px}.copy-btn:hover,.share-btn:hover{border-color:var(--accent);color:var(--accent)}.copy-btn.copied{border-color:#22c55e;color:#22c55e}.share-btn{color:#25d366;border-color:#25d366}.share-btn:hover{background:#25d366;color:#fff}.clear-btn{display:inline-block;margin-top:8px;padding:4px 0;background:0 0;border:none;color:var(--muted);font-size:13px;cursor:pointer;text-decoration:underline;text-underline-offset:2px}.clear-btn:hover{color:var(--accent)}.answer-hero{background:linear-gradient(135deg,var(--accent),#0284c7);color:#fff;border-radius:16px;padding:32px;margin-bottom:32px;text-align:center}.answer-hero .answer-value{font-size:48px;font-weight:800;margin:8px 0}.answer-hero .answer-label{font-size:18px;opacity:.9}.quick-table{width:100%;border-collapse:collapse;margin:16px 0}.quick-table td,.quick-table th{padding:12px 16px;text-align:left;border-bottom:1px solid var(--border)}.quick-table th{background:var(--surface);font-weight:600;font-size:14px;color:var(--muted)}.quick-table td{font-size:15px}.quick-table tr:last-child td{border-bottom:none}.quick-table td:last-child{font-weight:600;color:var(--accent)}.quick-table a{color:var(--accent);text-decoration:none}.quick-table a:hover{text-decoration:underline}.step-box{background:var(--surface);border-radius:12px;padding:20px 24px;margin:16px 0}.step-box .step{margin-bottom:12px;padding-left:32px;position:relative}.step-box .step:last-child{margin-bottom:0}.step-box .step-num{position:absolute;left:0;top:0;width:24px;height:24px;background:var(--accent);color:#fff;border-radius:50%;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center}.tip{background:var(--soft);border-left:3px solid var(--accent);padding:12px 16px;border-radius:0 8px 8px 0;margin:16px 0}.tip a{color:var(--accent);text-decoration:none;font-weight:600}.tip a:hover{text-decoration:underline}.recent-history{display:flex;align-items:center;gap:8px;padding:8px 0;flex-wrap:wrap;font-size:13px}.history-label{color:var(--muted);font-weight:500;white-space:nowrap}.history-list{display:flex;gap:6px;flex-wrap:wrap}.history-item{background:var(--soft);color:var(--accent);padding:3px 10px;border-radius:12px;font-size:12px;white-space:nowrap}.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:16px}.breadcrumb a{color:var(--muted);text-decoration:none}.breadcrumb a:hover{color:var(--accent)}.popular-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px}.popular-grid a{display:block;padding:10px 14px;background:var(--surface);border:1px solid var(--border);border-radius:8px;text-decoration:none;color:var(--text);font-size:14px;text-align:center;transition:border-color .2s}.popular-grid a:hover{border-color:var(--accent);color:var(--accent)}@media (max-width:640px){.header{flex-direction:column;gap:12px}.tabs{display:flex;flex-wrap:wrap;justify-content:center;gap:8px}.tabs a{margin-left:0}.inputs{grid-template-columns:1fr}.footer-links{gap:8px 16px}.calculator-grid{grid-template-columns:repeat(2,1fr);gap:12px}.calc-card{padding:12px}.calc-card .card-name{font-size:14px}.calc-card .card-desc{font-size:12px}.answer-hero .answer-value{font-size:36px}.answer-hero{padding:24px 16px}.popular-grid{grid-template-columns:repeat(2,1fr)}.quick-table td,.quick-table th{padding:10px 12px;font-size:14px}.inline-calcs{padding:16px}.inline-row{font-size:15px;gap:5px;padding:8px 0}.inline-row input{width:64px;padding:7px 6px;font-size:15px}}