/* Кровля·Расчёты — design tokens + styles (ported from Claude Design handoff, 4-screen DC → static) */
:root{
  --bg:#F4F3EF; --paper:#FBFAF7; --card:#fff; --header:rgba(247,246,242,0.92);
  --ink:#1A1B17; --ink2:#3A3C34; --ink3:#54564F; --ink4:#6A6C62;
  --muted:#8A8C82; --muted2:#9A9C90; --muted3:#A0A296;
  --line:#E2E0D8; --line2:#ECEAE2; --line3:#F0EEE7; --hair:#F0EFE9;
  --field:#FBFAF7; --field-bd:#CFCDC3;
  /* accent (cool technical green). Swap these 4 to retheme (teal #0A7C66 / чертёжный синий #2E6FB0). */
  --accent:#0E8A5F; --accent-strong:#0A6F4C; --accent-soft:#E7F3EC; --accent-line:#BCE0CC;
  --sans:'Onest',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.5;letter-spacing:-0.01em;-webkit-font-smoothing:antialiased;min-height:100vh}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;color:inherit;background:none;border:none;padding:0}
input,select{font:inherit;color:inherit}
img,svg{display:block}
h1,h2,h3,p{margin:0}
*:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:2px}
::selection{background:var(--accent);color:#fff}

.mono{font-family:var(--mono)}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:0.06em;color:var(--muted);text-transform:uppercase}
.accent-strong{color:var(--accent-strong)}

/* ---------- header ---------- */
.site-head{position:sticky;top:0;z-index:50;background:var(--header);backdrop-filter:saturate(140%) blur(6px);-webkit-backdrop-filter:saturate(140%) blur(6px);border-bottom:1px solid var(--line)}
.head-inner{max-width:1200px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:10px}
.brand svg{stroke:var(--accent)}
.brand-name{font-weight:700;font-size:16.5px;letter-spacing:-0.02em}
.brand-name .dot{color:var(--muted2);font-weight:600}
.nav{display:flex;align-items:center;gap:4px;margin-left:6px}
.nav-link{position:relative;padding:8px 12px;font-size:14.5px;font-weight:500;color:var(--ink2);border-radius:6px}
.nav-link:hover{color:var(--ink)}
.nav-link.is-active::after{content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;background:var(--accent)}
.head-right{margin-left:auto;display:flex;align-items:center;gap:16px}
.head-region{font-family:var(--mono);font-size:11.5px;letter-spacing:0.04em;color:var(--muted);text-transform:uppercase}

/* ---------- buttons ---------- */
.btn-accent{background:var(--accent);color:#fff;border-radius:8px;padding:10px 16px;font-size:14px;font-weight:600;display:inline-block}
.btn-accent:hover{background:var(--accent-strong)}
.btn-accent.lg{padding:13px 22px;font-size:14.5px}
.btn-light{background:#fff;color:var(--accent-strong);border-radius:8px;padding:12px 20px;font-size:14.5px;font-weight:600;display:inline-block}
.btn-light:hover{background:#F2F1EC}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--field-bd);border-radius:8px;padding:12px 20px;font-size:14.5px;font-weight:600;display:inline-block}
.btn-ghost:hover{border-color:var(--ink)}
.link-accent{font-size:14.5px;font-weight:600;color:var(--accent-strong)}

/* ---------- home ---------- */
.hero{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;flex-wrap:wrap;border-bottom:1px solid var(--line);padding:64px 0 40px}
.hero-l{max-width:660px}
.hero h1{font-size:46px;line-height:1.04;font-weight:700;letter-spacing:-0.03em;text-wrap:balance;margin-top:18px}
.hero-lead{margin-top:20px;font-size:17.5px;line-height:1.5;color:var(--ink3);max-width:560px}
.hero-checks{display:flex;flex-direction:column;gap:14px;min-width:240px}
.check{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--ink2)}
.check svg{stroke:var(--accent)}

.sec{padding-top:44px}
.sec.tight{padding-top:40px}
.sec-head{display:flex;align-items:baseline;gap:14px;margin-bottom:18px}
.sec-head h2{font-size:20px;font-weight:700;letter-spacing:-0.02em}
.sec-num{font-family:var(--mono);font-size:12px;color:var(--muted3)}

.grid-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.two-col{display:grid;grid-template-columns:repeat(auto-fit,minmax(330px,1fr));gap:40px;padding-top:40px}

.calc-card{text-align:left;display:flex;flex-direction:column;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px}
.calc-card:hover{border-color:var(--ink)}
.calc-card.feature{border-color:var(--accent-line)}
.calc-card.feature:hover{border-color:var(--accent)}
.calc-card .top{display:flex;align-items:flex-start;justify-content:space-between}
.calc-card svg{stroke:var(--ink3)}
.calc-card.feature svg{stroke:var(--accent)}
.calc-card .name{font-size:16px;font-weight:600;margin-bottom:5px}
.calc-card .desc{font-size:13.5px;line-height:1.45;color:var(--ink4)}
.badge{font-family:var(--mono);font-size:10px;letter-spacing:0.06em;color:var(--accent-strong);background:var(--accent-soft);padding:3px 7px;border-radius:4px}
.calc-row{flex-direction:row;align-items:center;gap:16px;padding:16px 18px}
.calc-row .name{font-size:15.5px;margin-bottom:3px}
.calc-row .desc{font-size:13px}

.trust{margin-top:56px;border-top:1px solid var(--line);padding:40px 0 24px}
.trust-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:32px}
.trust-rule{width:26px;height:2px;background:var(--accent);margin-bottom:14px}
.trust h3{font-size:17px;font-weight:600;margin-bottom:8px}
.trust p{font-size:14.5px;line-height:1.5;color:var(--ink3)}

/* ---------- breadcrumb / page title ---------- */
.crumbs{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:16px;flex-wrap:wrap}
.crumbs a:hover{color:var(--ink2)}
.crumbs .here{color:var(--ink2)}
.page{padding:36px 0 64px}
.page h1{font-size:34px;font-weight:700;letter-spacing:-0.03em}
.page-lead{margin:8px 0 28px;font-size:16px;line-height:1.5;color:var(--ink3);max-width:620px}

/* ---------- calculator ---------- */
.calc-grid{display:flex;gap:24px;flex-wrap:wrap;align-items:flex-start}
.inputs{flex:1 1 440px;min-width:320px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:26px}
.inputs .label{font-family:var(--mono);font-size:12px;letter-spacing:0.06em;color:var(--muted);text-transform:uppercase;margin-bottom:20px}
.field-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.ins-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px 16px;align-items:end}
.ins-field.span2,.angle-block.span2{grid-column:1/-1}
.angle-block.span2{margin-top:0}
.field>span{display:block;font-size:13.5px;color:var(--ink3);margin-bottom:7px}
.field input,.field select{width:100%}
.inp{font-family:var(--mono);font-size:18px;padding:11px 13px;border:1px solid var(--field-bd);border-radius:8px;background:var(--field)}
.inp:focus{border-color:var(--accent);outline:none}
.sel{font-size:15px;padding:12px;border:1px solid var(--field-bd);border-radius:8px;background:var(--field)}
.sel:focus{border-color:var(--accent);outline:none}
.angle-block{margin-top:22px}
.angle-top{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:10px}
.angle-top span:first-child{font-size:13.5px;color:var(--ink3)}
.angle-row{display:flex;align-items:center;gap:16px}
.angle-row input[type=range]{flex:1;accent-color:var(--accent);height:4px}
.angle-num{display:flex;align-items:baseline;gap:4px;width:96px;justify-content:flex-end}
.angle-num .inp{width:64px;text-align:right;padding:8px 10px}
.grid-end{margin-top:22px;display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:end}
.formula{margin-top:24px;border-top:1px dashed #DCDAD2;padding-top:18px}
.formula .cap{font-family:var(--mono);font-size:11.5px;letter-spacing:0.05em;color:var(--muted2);text-transform:uppercase;margin-bottom:10px}
.formula .body{font-family:var(--mono);font-size:13px;line-height:1.7;color:var(--ink3)}
.formula sub{font-size:10px}

.result-col{flex:1 1 420px;min-width:340px;position:sticky;top:84px;display:flex;flex-direction:column;gap:16px}
.result{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.result .big{padding:24px 26px 22px;border-bottom:1px solid var(--line2)}
.result .tag{display:flex;align-items:center;gap:8px;margin-bottom:14px}
.result .tag svg{stroke:var(--accent)}
.result .tag span{font-family:var(--mono);font-size:11.5px;letter-spacing:0.06em;color:var(--accent-strong);text-transform:uppercase}
.result .num{display:flex;align-items:baseline;gap:10px}
.result .num .v{font-family:var(--mono);font-size:54px;font-weight:600;letter-spacing:-0.02em;line-height:1}
.result .num .u{font-family:var(--mono);font-size:22px;color:var(--muted)}
.result .sub{margin-top:12px;font-size:14px;line-height:1.5;color:var(--ink3)}
.result .sub b{font-family:var(--mono);color:var(--ink);font-weight:600}
.readouts{display:grid;grid-template-columns:1fr 1fr}
.readouts>div{padding:16px 26px;border-bottom:1px solid var(--line2)}
.readouts>div:first-child{border-right:1px solid var(--line2)}
.readouts .k{font-size:12.5px;color:var(--muted);margin-bottom:5px}
.readouts .val{font-family:var(--mono);font-size:19px;font-weight:600}
.readouts .val span{font-size:13px;color:var(--muted)}
.matlist{padding:18px 26px 22px}
.matlist .cap{font-family:var(--mono);font-size:11.5px;letter-spacing:0.05em;color:var(--muted2);text-transform:uppercase;margin-bottom:12px}
.matrow{display:flex;align-items:baseline;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--line3)}
.matrow:last-child{border-bottom:none}
.matrow .mk{font-size:14px;color:var(--ink2)}
.matrow .mv{font-family:var(--mono);font-size:15px;font-weight:600}

/* blueprint */
.blueprint{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--paper);
  background-image:linear-gradient(#E7E5DD 1px,transparent 1px),linear-gradient(90deg,#E7E5DD 1px,transparent 1px),linear-gradient(#F0EFE9 1px,transparent 1px),linear-gradient(90deg,#F0EFE9 1px,transparent 1px);
  background-size:40px 40px,40px 40px,8px 8px,8px 8px}
.blueprint .bp-head{display:flex;align-items:center;justify-content:space-between;padding:11px 16px;border-bottom:1px solid var(--line);background:rgba(251,250,247,0.7)}
.blueprint .bp-head span{font-family:var(--mono);font-size:11px;letter-spacing:0.06em;color:var(--muted);text-transform:uppercase}
.blueprint .bp-head .scale{letter-spacing:0;text-transform:none}
.blueprint svg{width:100%;max-width:360px;margin:0 auto;height:auto;padding:8px 0;font-family:var(--mono)}
.bp-roof{fill:var(--accent-soft);stroke:var(--accent);stroke-width:1.6;stroke-linejoin:round}
.bp-arc{fill:none;stroke:var(--accent);stroke-width:1.1}
.bp-angle{fill:var(--accent-strong);font-weight:600}

/* next step */
.next{margin-top:40px}
.next-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}
.route{border-radius:12px;padding:24px;display:flex;flex-direction:column}
.route h3{font-size:19px;font-weight:600;margin-bottom:8px}
.route p{font-size:14.5px;line-height:1.5;margin-bottom:20px}
.route .btn-light,.route .btn-ghost{margin-top:auto;align-self:flex-start}
.route.accent{background:var(--accent);color:#fff}
.route.accent p{color:rgba(255,255,255,0.86)}
.route.accent p b{font-family:var(--mono);font-weight:600;color:#fff}
.route.plain{background:var(--card);border:1px solid var(--line)}
.route.plain p{color:var(--ink3)}
.route.plain p b{font-family:var(--mono);font-weight:600;color:var(--ink)}

/* guide snippet + related (calc footer) */
.calc-foot{margin-top:40px;display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:32px;border-top:1px solid var(--line);padding-top:32px}
.calc-foot p{font-size:15px;line-height:1.6;color:var(--ink2);margin-bottom:12px}
.related{display:flex;flex-direction:column;gap:2px}
.related a{text-align:left;border-bottom:1px solid var(--line2);padding:11px 0;font-size:15px;display:flex;justify-content:space-between}
.related a:last-child{border-bottom:none}
.related a:hover{color:var(--accent-strong)}
.related a .arr{color:#B0B2A8}

/* ---------- guide page ---------- */
.guide-grid{display:grid;grid-template-columns:220px 1fr;gap:48px;align-items:start}
.toc{position:sticky;top:84px}
.toc .cap{font-family:var(--mono);font-size:11px;letter-spacing:0.06em;color:var(--muted2);text-transform:uppercase;margin-bottom:14px}
.toc nav{display:flex;flex-direction:column;gap:2px;font-size:14px;border-left:1px solid var(--line)}
.toc a{padding:7px 14px;color:var(--ink3)}
.toc a:hover{color:var(--ink)}
.toc a.is-active{color:var(--accent-strong);border-left:2px solid var(--accent);margin-left:-1px}
.article{max-width:680px}
.article h1{font-size:36px;line-height:1.1;font-weight:700;letter-spacing:-0.03em;margin-bottom:16px}
.article .lead{font-size:18px;line-height:1.55;color:var(--ink2);margin-bottom:28px}
.article h2{font-size:22px;font-weight:700;letter-spacing:-0.02em;margin:36px 0 12px;scroll-margin-top:84px}
.article p{font-size:16.5px;line-height:1.65;color:var(--ink2);margin-bottom:16px}
.article ul{margin:0 0 16px;padding-left:20px;font-size:16.5px;line-height:1.7;color:var(--ink2)}
.article li{margin-bottom:6px}
.formula-box{background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:18px 20px;margin-bottom:16px;font-family:var(--mono);font-size:15px;line-height:1.8;color:var(--ink)}
.formula-box .small{color:var(--muted);font-size:13.5px}
.cta-inset{margin:32px 0 8px;background:var(--card);border:1px solid var(--accent-line);border-radius:12px;padding:22px 24px;display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.cta-inset .t{flex:1;min-width:220px}
.cta-inset .t .h{font-size:17px;font-weight:600;margin-bottom:4px}
.cta-inset .t .d{font-size:14.5px;color:var(--ink3)}

/* ---------- category page ---------- */
.cat-intro{display:flex;align-items:flex-start;gap:20px;border-bottom:1px solid var(--line);padding-bottom:32px;margin-bottom:32px}
.cat-intro svg{stroke:var(--accent);flex-shrink:0;margin-top:4px}
.cat-intro h1{margin-bottom:12px}
.cat-intro p{font-size:16.5px;line-height:1.55;color:var(--ink3)}
.cat-list{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--card)}
.cat-row{text-align:left;display:flex;align-items:center;gap:20px;padding:22px 24px;border-bottom:1px solid var(--line2)}
.cat-row:last-child{border-bottom:none}
.cat-row:hover{background:var(--paper)}
.cat-row svg{flex-shrink:0;stroke:var(--ink3)}
.cat-row.feature svg{stroke:var(--accent)}
.cat-row .t{flex:1}
.cat-row .th{display:flex;align-items:center;gap:10px;margin-bottom:4px}
.cat-row .th .n{font-size:17px;font-weight:600}
.cat-row .d{font-size:14px;color:var(--ink4)}
.cat-row .arr{font-family:var(--mono);color:#B0B2A8;font-size:18px}
.cat-row.is-soon{opacity:0.62;cursor:default}
.cat-row.is-soon:hover{background:var(--card)}
.badge.soon{color:var(--muted);background:#EEEDE7}
.cat-guide{margin-top:28px;display:flex;align-items:center;gap:16px;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:18px 22px;flex-wrap:wrap}
.cat-guide .g{font-size:15px;color:var(--ink2);flex:1;min-width:200px}

/* ---------- footer ---------- */
.site-foot{border-top:1px solid var(--line);background:var(--hair);margin-top:8px}
.foot-inner{max-width:1200px;margin:0 auto;padding:40px 24px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
.foot-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.foot-brand svg{stroke:var(--accent)}
.foot-brand span{font-weight:700;font-size:15px}
.foot p{font-size:13.5px;line-height:1.5;color:var(--ink4);max-width:340px}
.foot .cap{font-family:var(--mono);font-size:11px;letter-spacing:0.06em;color:var(--muted2);text-transform:uppercase;margin-bottom:14px}
.foot-links{display:flex;flex-direction:column;gap:9px;font-size:14px;color:var(--ink2)}
.foot-links a:hover{color:var(--ink)}

/* ---------- responsive ---------- */
@media(max-width:860px){
  .hero h1{font-size:36px}
  .page h1{font-size:28px}
  .article h1{font-size:30px}
  .result-col{position:static}
  .guide-grid{grid-template-columns:1fr;gap:24px}
  .toc{position:static;display:none}
  .foot-inner{grid-template-columns:1fr;gap:28px}
  .nav{display:none}
}
@media(max-width:560px){
  .wrap,.head-inner,.foot-inner{padding-left:16px;padding-right:16px}
  .head-region{display:none}
  .field-2,.grid-end,.readouts{grid-template-columns:1fr}
}