:root{--blue:#0063dc;--blue-dark:#004794;--pink:#d0006d;--text:#333;--muted:#61656b;--line:#e1e5ea;--pale:#f4f6f8;--radius:8px}*{box-sizing:border-box}html{scroll-padding-top:90px}body{margin:0;background:#fff;color:var(--text);font:16px/1.75 Arial,Helvetica,sans-serif;letter-spacing:.1px}a{color:var(--blue);text-decoration:none;font-weight:600}a:hover{text-decoration:underline;color:var(--blue-dark)}button,input,select,textarea{font:inherit}button,a,input,select,textarea,summary{ -webkit-tap-highlight-color:transparent}button,summary{cursor:pointer}button:disabled{cursor:wait}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #e39500;outline-offset:3px}h1,h2,h3,p,ul{margin-top:0}h1{color:var(--pink);font-size:28px;line-height:1.3;margin:0 0 20px;letter-spacing:0}h2{font-size:21px;line-height:1.4;margin-bottom:16px}h3{font-size:17px;line-height:1.4}p{margin-bottom:20px}ul{padding-left:22px}svg{display:block}.site-header{border-top:4px solid var(--blue);background:#fff;box-shadow:0 3px 14px #00000012;position:sticky;top:0;z-index:30}.header-inner{max-width:1380px;margin:auto;display:flex;justify-content:space-between;align-items:center;min-height:65px;padding:0 24px;gap:20px}.brand{flex-shrink:0;display:block;line-height:1;letter-spacing:-1px;font-size:28px;font-weight:800}.brand:hover{text-decoration:none;color:var(--blue)}.brand-accent{color:var(--pink)}.brand small{display:block;font-size:10px;font-weight:400;letter-spacing:.2px;text-align:right;margin-top:7px}.main-nav{display:flex;align-items:stretch;gap:0}.nav-group{position:relative}.nav-group summary{padding:20px 8px;color:var(--blue);font-weight:700;list-style:none;white-space:nowrap}.nav-group summary::-webkit-details-marker{display:none}.nav-group[open] summary,.nav-group summary:hover{background:var(--blue);color:#fff}.dropdown{position:absolute;top:100%;left:0;min-width:290px;max-height:75vh;overflow:auto;padding:8px 0;background:var(--blue);box-shadow:0 10px 20px #0002}.nav-group:nth-last-of-type(-n+4) .dropdown{left:auto;right:0}.dropdown a{display:block;font-size:14px;line-height:1.45;padding:8px 14px;color:#fff}.dropdown a:hover{background:var(--blue-dark);text-decoration:none}.dropdown .category-link{font-size:13px;border-bottom:1px solid #ffffff40;margin-bottom:6px;padding-bottom:12px}.search-link{display:flex;align-items:center;padding:0 10px;color:#626973}.menu-check,.menu-toggle{display:none}.skip-link{position:fixed;top:-100px;left:20px;background:#fff;padding:12px 20px;z-index:100}.skip-link:focus{top:10px}.page-layout{max-width:1300px;padding:30px 28px 0;margin:auto;display:grid;grid-template-columns:minmax(0,970px) 255px;gap:28px;min-height:calc(100vh - 285px)}main{min-width:0}main:focus{outline:none}.intro{font-size:17px;color:#50555a;line-height:1.85;margin-bottom:24px}.sidebar{min-width:0}.side-section{border:1px solid #77aaff;margin-bottom:25px}.side-section h2{margin:0;background:var(--blue-dark);border-left:5px solid var(--blue);color:#fff;padding:10px 12px;font-size:16px}.side-section ul{list-style:none;padding:0;margin:0}.side-section li+li{border-top:1px solid var(--line)}.side-section a{display:block;padding:9px 11px;font-size:14px;line-height:1.55}.side-section a:hover{background:var(--pale)}.help-box{background:#2962a5;color:#fff;text-align:center;border-radius:var(--radius);padding:24px 18px;font-size:14px}.help-box h2{color:#ffe574;font-size:21px;margin-bottom:12px}.help-box p{margin:12px 0;line-height:1.8}.help-box a{color:#fff}.help-symbol{width:42px;height:42px;line-height:38px;border:2px solid #ffe574;color:#ffe574;border-radius:50%;font-size:29px;font-weight:bold;margin:0 auto 15px}.search-form{background:var(--pale);padding:20px 22px;border-radius:var(--radius);margin:24px 0 30px}.search-form label{display:block;font-size:15px;font-weight:bold;margin-bottom:8px}.search-controls{display:flex}.search-controls input{flex:1;min-width:0;border:1px solid #a5afbc;background:#fff;border-radius:5px 0 0 5px;padding:12px 14px;box-shadow:0 1px 3px #00000008}.search-controls button{background:var(--blue);color:white;border:1px solid var(--blue);border-radius:0 5px 5px 0;padding:10px 28px;font-weight:bold}.search-controls button:hover{background:var(--blue-dark)}.section-bar{background:#2962a5;color:#fff;text-align:center;border-radius:8px 8px 0 0;padding:11px 16px;margin:0;font-size:18px}.section-bar.muted{background:#edf0f3;color:var(--text)}.link-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));list-style:none;padding:0;margin:0;border:1px solid var(--line);border-radius:0 0 8px 8px;overflow:hidden}.link-grid li{border-bottom:1px solid var(--line);padding:10px 15px;font-size:15px}.link-grid li:nth-child(odd){border-right:1px solid var(--line)}.link-grid li::before{content:'›';color:#8a97a6;margin-right:9px}.popular-section{margin-bottom:38px}.catalog-heading{display:flex;justify-content:space-between;align-items:baseline;gap:10px;border-bottom:2px solid var(--blue);margin-bottom:22px}.catalog-heading h2{margin-bottom:10px}.catalog-heading>span{color:var(--muted);font-size:13px;white-space:nowrap}.category-grid{column-count:2;column-gap:28px}.category-section{break-inside:avoid;margin-bottom:25px}.category-section h3{padding:10px 12px;background:var(--pale);border-left:4px solid var(--blue);margin-bottom:10px}.category-section h3 a{color:#333}.category-section ul{list-style:none;margin:0;padding:0 0 0 15px}.category-section li{padding:3px 0;font-size:15px;line-height:1.65}.category-section li::before{content:'·';color:#718199;padding-right:9px}.article-section{margin:32px 0 0}.article-section h2{margin-top:28px}.article-section p{line-height:1.9}.breadcrumb{display:flex;gap:10px;align-items:center;flex-wrap:wrap;font-size:12px;color:#717781;margin-bottom:18px;line-height:1.5}.breadcrumb a{font-weight:400}.info-note{background:#e8f4fc;border:1px solid #b7d8f1;padding:13px 16px;border-radius:5px;font-size:14px;line-height:1.7;color:#175681;display:block}.info-note>span{display:inline-block;background:#1470bd;color:white;font-family:Georgia,serif;border-radius:50%;height:20px;width:20px;text-align:center;line-height:20px;font-weight:bold;margin-right:6px}.calculation-form fieldset{border:2px solid #e8eaed;border-radius:12px;padding:20px 22px 16px;margin:28px 0;min-width:0}.calculation-form legend{background:#eceeef;font-size:18px;font-weight:bold;border-radius:8px;padding:7px 13px;max-width:100%;line-height:1.5}.required-note{font-size:13px;color:var(--muted);margin-bottom:22px}.required-note>span,.required-star{color:#bf1130}.form-row{display:grid;grid-template-columns:225px 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dd{font-size:24px;color:#35651d;font-weight:700}.result-note{font-size:13px;margin:12px 0;color:#516149}.result-actions{display:flex;gap:18px;align-items:center;flex-wrap:wrap;margin-top:18px;font-size:13px}.text-button{background:none;border:0;color:var(--blue);padding:0;font-weight:600;font-size:inherit}.text-button:hover{text-decoration:underline}.js-only{display:none}.js .js-only{display:inline-block}.error-summary{background:#fff1f2;border:1px solid #e5a4af;border-left:4px solid #c11733;padding:18px 22px;border-radius:5px}.error-summary h2{font-size:18px;color:#a7162c;margin-bottom:10px}.error-summary ul{margin:0}.error-summary a{color:#a7162c;font-weight:400}.related-section{margin-top:30px}.formula{background:#f6f7f9;border-left:3px solid var(--blue);padding:15px 18px;font-weight:600;overflow-wrap:anywhere}.table-scroll{overflow-x:auto;margin-bottom:30px;border:1px solid var(--line);border-radius:6px}table{border-collapse:collapse;width:100%;font-size:13px;white-space:nowrap}th,td{text-align:right;padding:10px 12px;border-bottom:1px solid var(--line)}th{background:var(--blue-dark);color:#fff}tbody tr:nth-child(even){background:var(--pale)}.calculator-list{list-style:none;padding:0}.calculator-list li{border-bottom:1px solid var(--line);padding:18px 0}.calculator-list h2{font-size:19px;margin-bottom:8px}.calculator-list h2 span{font-weight:400;margin-left:6px}.calculator-list p{font-size:14px;color:var(--muted);margin:0}.empty-state{padding:25px 0}.empty-state h2{font-size:20px}.site-footer{text-align:center;background:linear-gradient(#fafbfc,#fff);border-top:7px solid var(--blue-dark);padding:28px 20px 20px;margin-top:55px;font-size:13px;color:#69717b}.site-footer .footer-motto{font-size:23px;font-weight:bold;color:var(--pink);margin-bottom:15px}.site-footer nav{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;margin:15px 0}.site-footer p:last-child{margin-bottom:0}.ad-slot{position:relative;text-align:center;overflow:hidden;min-height:300px;margin:30px 0;background:#fafafa}.ad-label{display:block;font-size:10px;letter-spacing:1px;color:#777}.adsbygoogle{display:block}.ad-sidebar{min-height:600px}.content-page{max-width:850px}.content-page h2{margin-top:30px}.content-page ul{margin-bottom:24px}
@media(min-width:1400px){.page-layout{padding-top:34px}.main-nav summary{padding-left:10px;padding-right:10px}}
@media(max-width:1199px){.header-inner{flex-wrap:wrap;gap:0;min-height:68px;padding:14px 22px}.brand{font-size:26px}.menu-toggle{display:flex;align-items:center;gap:12px;background:var(--blue);color:#fff;padding:8px 13px;border-radius:4px;cursor:pointer;font-size:14px;font-weight:600}.menu-check{display:block;position:absolute;opacity:0;width:1px;height:1px}.menu-check:focus-visible+.menu-toggle{outline:3px solid #e39500;outline-offset:3px}.main-nav{display:none;flex-basis:100%;flex-direction:column;max-height:75vh;overflow:auto;margin-top:15px;background:var(--blue)}.menu-check:checked~.main-nav{display:flex}.nav-group summary{padding:10px 15px;color:#fff;border-bottom:1px solid #ffffff30}.nav-group summary::after{content:'+';float:right}.nav-group[open] summary::after{content:'−'}.dropdown{position:static;box-shadow:none;min-width:0;background:var(--blue-dark);max-height:none}.dropdown a{padding:9px 23px}.search-link{color:#fff;padding:14px 15px}.page-layout{grid-template-columns:minmax(0,1fr) 220px;gap:22px;padding-left:22px;padding-right:22px}.form-row{grid-template-columns:180px minmax(0,1fr);gap:12px}}
@media(max-width:900px){.page-layout{grid-template-columns:minmax(0,1fr);padding-top:24px}.sidebar{display:none}.category-grid{column-gap:22px}.form-row{grid-template-columns:220px minmax(0,1fr)}}
@media(max-width:600px){body{font-size:15px}.header-inner{padding:12px 14px}.brand{font-size:22px}.brand small{font-size:8px}.menu-toggle{font-size:12px;padding:7px 9px;gap:7px}.page-layout{padding:22px 14px 0}h1{font-size:25px;margin-bottom:16px}.intro{font-size:16px}.search-form{padding:16px}.search-controls input{padding:10px}.search-controls button{padding:10px 18px}.link-grid{grid-template-columns:1fr}.link-grid li{padding:10px 12px}.link-grid li:nth-child(odd){border-right:0}.catalog-heading{display:block}.catalog-heading h2{margin-bottom:0}.catalog-heading>span{display:block;padding:3px 0 10px}.category-grid{column-count:1}.category-section li{padding:5px 0}.calculation-form fieldset{padding:14px 14px 12px;margin-top:24px}.calculation-form legend{font-size:16px;padding:7px 9px}.form-row{grid-template-columns:1fr;gap:6px;margin-bottom:20px}.form-row>label{padding:0}.input-unit input{max-width:100%}.form-actions{gap:14px}.primary-button,.secondary-button{padding:11px 25px;font-size:17px}.number-hint{font-size:10px}.result{padding:16px}.result dl>div{display:block;padding:10px 0}.result dd{text-align:left;max-width:100%;margin-top:4px}.result .primary-result dd{font-size:23px}.info-note{font-size:13px}.site-footer nav{gap:12px 20px}.site-footer .footer-motto{font-size:20px}.breadcrumb{font-size:11px;gap:7px}.ad-slot{min-height:280px}}
@media(prefers-reduced-motion:no-preference){a,button{transition:background-color .12s,color .12s}}
@media print{.site-header,.site-footer,.sidebar,.ad-slot,.result-actions,.related-section,.info-note,.calculation-form,.breadcrumb,.skip-link{display:none!important}.page-layout{display:block;padding:0;max-width:none}body{font-size:11pt}.result{break-inside:avoid}h1{font-size:21pt}.table-scroll{overflow:visible}thead{display:table-header-group}tr{break-inside:avoid}a{color:#333;text-decoration:none}}