:root{--ink:#14221c;--muted:#617068;--paper:#fbfcf9;--surface:#fff;--line:#dbe5dc;--green:#15835b;--green-dark:#0d5e40;--lime:#d7f36a;--warn:#a45b11;--shadow:0 16px 48px #14221c14}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background:var(--paper);margin:0;font:16px/1.5 Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Arial,sans-serif}a{color:inherit}.site-header{border-bottom:1px solid var(--line);z-index:10;backdrop-filter:blur(12px);background:#fbfcf9f0;justify-content:space-between;align-items:center;min-height:72px;padding:0 max(24px,50% - 590px);display:flex;position:sticky;top:0}.brand{letter-spacing:-1px;align-items:center;gap:8px;font-size:24px;font-weight:800;text-decoration:none;display:flex}.brand>img{object-fit:contain;width:40px;height:40px}.brand>span>span{color:var(--green)}nav{gap:24px;display:flex}nav a,footer a{color:var(--muted);font-size:14px;font-weight:650;text-decoration:none}nav a:hover,footer a:hover{color:var(--green)}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline-offset:3px;outline:3px solid #15835b75}.menu-toggle{display:none}.hero,.section{max-width:1180px;margin:auto}.hero{grid-template-columns:1.25fr .75fr;align-items:center;gap:64px;padding:88px 24px 72px;display:grid}.eyebrow{color:var(--green);text-transform:uppercase;letter-spacing:.11em;margin:0 0 10px;font-size:12px;font-weight:800}.hero h1{letter-spacing:-.055em;margin:0;font-size:clamp(40px,5.5vw,70px);line-height:1.02}.lead{max-width:660px;color:var(--muted);margin:24px 0 32px;font-size:20px}.button{background:var(--green);color:#fff;border-radius:9px;padding:13px 20px;font-weight:750;text-decoration:none;display:inline-block;box-shadow:0 8px 20px #15835b38}.button:hover{background:var(--green-dark)}.hero-card{border:1px solid var(--line);box-shadow:var(--shadow);background:linear-gradient(145deg,#fff,#f0f8f1);border-radius:16px;gap:3px;padding:28px;display:grid}.hero-card strong{margin-top:12px;font-size:17px}.hero-card strong:first-child{margin-top:0}.hero-card span{color:var(--muted);font-size:14px}.section{border-top:1px solid var(--line);padding:62px 24px}.section-heading{max-width:690px;margin-bottom:28px}.section h2{letter-spacing:-.04em;margin:0 0 8px;font-size:34px;line-height:1.15}.section-heading>p:last-child{color:var(--muted);margin:0}.calculator-tabs{gap:8px;margin-bottom:18px;padding-bottom:10px;display:flex;overflow:auto}.tab{white-space:nowrap;border:1px solid var(--line);color:var(--muted);cursor:pointer;background:#fff;border-radius:999px;padding:10px 14px;font-weight:700}.tab.active{color:#fff;border-color:var(--green);background:var(--green)}.calculator-grid{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.calculator-link{--category:#15835b;--category-bg:#e9f6ef;border:1px solid var(--line);border-top:4px solid var(--category);background:#fff;border-radius:14px;flex-direction:column;min-height:190px;padding:22px;text-decoration:none;transition:transform .15s,box-shadow .15s;display:flex;box-shadow:0 8px 24px #14221c0a}.calculator-link:hover{box-shadow:var(--shadow);transform:translateY(-3px)}.category-badge{color:var(--category);background:var(--category-bg);letter-spacing:.07em;text-transform:uppercase;border-radius:999px;align-self:flex-start;align-items:center;gap:7px;padding:5px 9px;font-size:11px;font-weight:850;display:inline-flex}.category-badge:before{content:"";background:linear-gradient(90deg,var(--category) 42%,transparent 42% 58%,var(--category) 58%),linear-gradient(0deg,var(--category) 42%,transparent 42% 58%,var(--category) 58%);opacity:.9;border-radius:3px;width:11px;height:11px}.category-otdelka{--category:#15835b;--category-bg:#e8f5ed}.category-oborudovanie{--category:#4b58aa;--category-bg:#eef0ff}.category-energiya{--category:#a06a00;--category-bg:#fff5d8}.category-kommunalnye-rashody{--category:#087c88;--category-bg:#e5f6f7}.calculator-link h3{letter-spacing:-.03em;margin:14px 0 6px;font-size:22px}.calculator-link p{color:var(--muted);margin:0;font-size:14px}.calculator-link b{color:var(--category);margin-top:auto;padding-top:18px;font-size:14px}.page-hero{max-width:1180px;margin:auto;padding:56px 24px 30px}.breadcrumbs{color:var(--muted);margin:0 0 24px;font-size:13px}.breadcrumbs a{color:var(--green)}.page-hero h1{letter-spacing:-.045em;max-width:760px;margin:0;font-size:clamp(38px,5vw,58px);line-height:1.08}.page-hero>p:last-child{max-width:710px;color:var(--muted);margin:16px 0 0;font-size:18px}.compact{padding-top:30px;padding-bottom:30px}.formula-section h2{margin:0 0 18px}.formula-grid{grid-template-columns:1fr 1fr;gap:16px;display:grid}.formula-grid article{border:1px solid var(--line);background:#fff;border-radius:12px;padding:20px}.formula-grid code{color:#185137;background:#eef6ef;border-radius:7px;padding:12px;font:600 14px/1.45 ui-monospace,SFMono-Regular,Consolas,monospace;display:block}.formula-grid h3{margin:0 0 7px;font-size:17px}.formula-grid p{color:var(--muted);margin:12px 0 0;font-size:14px}.sources{color:var(--muted);margin:16px 0 0;font-size:13px}.sources a{color:var(--green);font-weight:700}.calculator-panel{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:16px;grid-template-columns:.8fr 1.15fr .8fr;gap:24px;padding:28px;display:grid}.calculator-copy h3{letter-spacing:-.035em;margin:0 0 12px;font-size:28px;line-height:1.15}.calculator-copy>p:not(.eyebrow){color:var(--muted);margin:0}.hint{background:#f1f6f1;border-radius:8px;padding:11px 12px;font-size:13px;line-height:1.4;margin-top:20px!important}.hint.warning{color:#754313;background:#fff6e8}.calculator-form{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.calculator-form label{color:#4d5c54;gap:5px;font-size:13px;font-weight:700;display:grid}.calculator-form input{width:100%;min-width:0;color:var(--ink);font:inherit;background:#fff;border:1px solid #cbd8cd;border-radius:8px;padding:10px 11px}.calculator-form input:focus{border-color:var(--green);outline:3px solid #15835b29}.result-card{color:#fff;background:#143b2c;border-radius:14px;align-self:start;min-height:250px;padding:20px}.result-card h4{color:#bcdbcb;margin:0 0 4px;font-size:14px;font-weight:700}.result-main{letter-spacing:-.05em;margin:2px 0 18px;font-size:35px;line-height:1;display:block}.result-row{border-top:1px solid #ffffff29;justify-content:space-between;gap:10px;padding:9px 0;font-size:14px;display:flex}.result-row span{color:#c4d8cb}.result-note{color:#b9d2c3;margin:15px 0 0;font-size:12px;line-height:1.4}.principles{padding-bottom:88px}.principle-grid{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.principle-grid article{border:1px solid var(--line);background:#fff;border-radius:12px;padding:22px}.principle-grid strong{font-size:17px}.principle-grid p{color:var(--muted);margin:8px 0 0;font-size:14px}footer{border-top:1px solid var(--line);justify-content:space-between;max-width:1180px;margin:auto;padding:24px;font-size:14px;display:flex}footer span{font-weight:800}.how-to-grid{counter-reset:steps;grid-template-columns:repeat(4,1fr);gap:16px;margin:0;padding:0;list-style:none;display:grid}.how-to-grid li{counter-increment:steps;border:1px solid var(--line);background:#fff;border-radius:12px;padding:22px}.how-to-grid li:before{content:counter(steps);color:#fff;background:var(--green);border-radius:50%;place-items:center;width:29px;height:29px;margin-bottom:15px;font-size:14px;font-weight:800;display:grid}.how-to-grid strong{font-size:17px}.how-to-grid p{color:var(--muted);margin:8px 0 0;font-size:14px}.feedback-section{padding-bottom:72px}.feedback-form{border:1px solid var(--line);max-width:800px;box-shadow:var(--shadow);background:#fff;border-radius:14px;grid-template-columns:1fr 1fr;gap:16px;padding:24px;display:grid}.feedback-form label{color:#4d5c54;gap:6px;font-size:14px;font-weight:700;display:grid}.feedback-form input,.feedback-form select,.feedback-form textarea{width:100%;color:var(--ink);font:inherit;background:#fff;border:1px solid #cbd8cd;border-radius:8px;padding:11px}.feedback-form textarea{resize:vertical}.feedback-form input:focus,.feedback-form select:focus,.feedback-form textarea:focus{border-color:var(--green);outline:3px solid #15835b29}.feedback-message,.feedback-note{grid-column:1/-1}.feedback-form .button{cursor:pointer;border:0;justify-self:start}.feedback-note{color:var(--muted);margin:0;font-size:13px}.visually-hidden{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.related-section{padding-top:0}.related-section p{color:#315342;background:#eef6ef;border-radius:10px;margin:0;padding:14px 18px}.related-section a{color:var(--green);font-weight:750}@media (width<=900px){.hero{grid-template-columns:1fr;gap:30px;padding-top:58px}.calculator-panel{grid-template-columns:1fr}.calculator-grid,.how-to-grid{grid-template-columns:repeat(2,1fr)}.result-card{min-height:auto}.calculator-copy{max-width:700px}}@media (width<=600px){.site-header{padding:0 16px}.site-header nav a:not(:last-child){display:none}.hero,.section,.page-hero{padding-left:16px;padding-right:16px}.hero h1{font-size:42px}.lead{font-size:17px}.calculator-form,.calculator-grid,.formula-grid,.how-to-grid,.feedback-form{grid-template-columns:1fr}.section h2{font-size:29px}.calculator-panel{padding:18px}.calculator-tabs{margin-right:-16px}.tab{font-size:13px}footer{flex-wrap:wrap;gap:12px;padding:20px 16px}}.feedback-section{background:linear-gradient(#d7f36a29,#d7f36a00);border-top:0}.feedback-form{background:#fff;border:0;border-radius:18px;gap:20px;max-width:900px;padding:30px;position:relative;box-shadow:0 18px 55px #14221c21}.feedback-form:before{content:"";background:linear-gradient(90deg,var(--green),#7aac24);border-radius:18px 18px 0 0;height:5px;position:absolute;top:0;left:0;right:0}.feedback-form label{color:#263b30;gap:8px;font-size:14px}.feedback-form input,.feedback-form select,.feedback-form textarea{border-color:#c6d4c8;border-radius:10px;padding:13px 14px;transition:border-color .15s,box-shadow .15s}.feedback-form textarea{min-height:145px;line-height:1.5}.feedback-form input:hover,.feedback-form select:hover,.feedback-form textarea:hover{border-color:#94ac9a}.feedback-form input:focus,.feedback-form select:focus,.feedback-form textarea:focus{box-shadow:0 0 0 4px #15835b21}.feedback-actions{grid-column:1/-1;align-items:center;gap:18px;padding-top:4px;display:flex}.feedback-actions .button{padding:14px 20px}.feedback-actions .button:disabled{opacity:.65;cursor:wait}.feedback-actions .feedback-note{max-width:530px}.feedback-status{border-radius:10px;grid-column:1/-1;margin:0;padding:12px 14px;font-size:14px;font-weight:650;display:none}.feedback-status:not(:empty){color:#315342;background:#f1f6f1;display:block}.feedback-status[data-state=success]{color:#245d30;background:#e7f6dd}.feedback-status[data-state=error]{color:#9a331d;background:#fff0ed}@media (width<=600px){.feedback-form{padding:23px 18px}.feedback-actions{flex-direction:column;align-items:flex-start;gap:10px}.feedback-actions .button{width:100%}}.feedback-consent{grid-column:1/-1;align-items:flex-start;gap:9px;line-height:1.45;font-size:13px!important;display:flex!important}.feedback-consent input{margin:3px 0 0;width:auto!important;padding:0!important}.feedback-consent a{color:var(--green);font-weight:750}.result-error{font-size:25px}.example-card{border:1px solid var(--line);border-left:4px solid var(--green);background:#fff;border-radius:12px;max-width:820px;padding:22px 24px}.example-card p{color:var(--muted);margin:0 0 12px}.example-card p:last-child{margin-bottom:0}.example-card strong{color:var(--ink)}.example-card .example-note{border-top:1px solid var(--line);padding-top:12px;font-size:14px}.faq-section details{border:1px solid var(--line);background:#fff;border-radius:12px;margin:10px 0;transition:border-color .15s,box-shadow .15s}.faq-section details[open]{border-color:#b7d9c4;box-shadow:0 8px 20px #14221c0d}.faq-section summary{cursor:pointer;padding:18px 52px 18px 20px;font-weight:800;line-height:1.35;list-style:none;position:relative}.faq-section summary::-webkit-details-marker{display:none}.faq-section summary:after{content:"+";width:24px;height:24px;color:var(--green);background:#e8f5ed;border-radius:50%;place-items:center;font-size:20px;font-weight:500;display:grid;position:absolute;top:50%;right:20px;transform:translateY(-50%)}.faq-section details[open] summary:after{content:"−"}.faq-section details p{color:var(--muted);margin:0;padding:0 20px 20px}.related-section h2{margin-bottom:18px}.related-grid{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.related-card{--category:#15835b;--category-bg:#e9f6ef;border:1px solid var(--line);border-top:4px solid var(--category);background:#fff;border-radius:12px;flex-direction:column;align-items:flex-start;min-height:168px;padding:20px;text-decoration:none;display:flex}.related-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}.related-card strong{letter-spacing:-.02em;margin:14px 0 7px;font-size:19px}.related-card>span:last-child{color:var(--muted);font-size:13px}.related-feedback{color:#315342;background:#eef6ef;border-radius:10px;margin:18px 0 0;padding:14px 18px}.related-feedback a,.prose a{color:var(--green);font-weight:750}.prose{max-width:900px}.prose h2{margin-top:30px}.prose h2:first-child{margin-top:0}.prose p,.prose li{color:var(--muted)}.prose li{margin:8px 0}footer>div{flex-wrap:wrap;justify-content:flex-end;gap:12px 20px;display:flex}.related-feedback{margin-top:26px}.prose a.button{color:#fff}.prose .info-card{border:1px solid var(--line);background:#fff;border-radius:14px;margin:24px 0;padding:22px 24px}.prose .info-card h2{margin-top:0}.prose .info-card p:last-child{margin-bottom:0}.prose .small-note{font-size:14px}.prose table{border-collapse:collapse;width:100%;margin:16px 0}.prose th,.prose td{border:1px solid var(--line);text-align:left;vertical-align:top;padding:12px}.prose th{color:var(--ink);background:#eef6ef}@media (width<=900px){.related-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=600px){.menu-toggle{border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:9px;align-items:center;gap:8px;padding:9px 11px;font:750 13px inherit;display:flex}.menu-toggle i,.menu-toggle i:before,.menu-toggle i:after{background:var(--green);content:"";border-radius:2px;width:17px;height:2px;transition:transform .15s;display:block}.menu-toggle i{position:relative}.menu-toggle i:before{position:absolute;top:-5px}.menu-toggle i:after{position:absolute;top:5px}.menu-toggle[aria-expanded=true] i{background:0 0}.menu-toggle[aria-expanded=true] i:before{top:0;transform:rotate(45deg)}.menu-toggle[aria-expanded=true] i:after{top:0;transform:rotate(-45deg)}.site-header nav{border:1px solid var(--line);box-shadow:var(--shadow);background:#fff;border-radius:12px;padding:8px;display:none;position:absolute;top:calc(100% + 1px);left:12px;right:12px}.site-header nav.is-open{gap:2px;display:grid}.site-header nav a,.site-header nav a:not(:last-child){color:var(--ink);border-radius:8px;padding:12px;display:block}.site-header nav a:hover{background:#eef6ef}.related-grid{grid-template-columns:1fr}.example-card{padding:18px}.faq-section summary{padding:16px 48px 16px 16px}.faq-section details p{padding:0 16px 16px}.related-feedback{padding:14px 16px}footer>div{justify-content:flex-start;gap:9px 16px}}@media (width<=760px){.principle-grid{grid-template-columns:1fr}.principle-grid article{padding:20px}.principle-grid p{max-width:38rem}}.faq-section h2{margin:0 0 14px}.faq-section details{border:1px solid var(--line);background:#fff;border-radius:10px;padding:15px 18px}.faq-section summary{cursor:pointer;font-weight:750}.faq-section details p{color:var(--muted);margin:10px 0 0}
