/* stroitelnye-materialy-v-kostrome.ru — строгий швейцарский: белый, графит, один красный */
:root{
  --ink:#1C1D1F; --ink2:#3A3C40; --mute:#6E7177; --mute2:#9A9DA3;
  --line:#E4E5E7; --line2:#EFF0F1; --soft:#F6F6F7; --paper:#fff;
  --red:#E30613; --red-soft:#FDECED;
  --side:272px; --pad:48px;
  --f:'Geist',system-ui,-apple-system,'Segoe UI',sans-serif;
  --m:'Geist Mono',ui-monospace,Menlo,monospace;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:400 16px/1.5 var(--f);font-feature-settings:"tnum" 1;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
button{font:inherit;color:inherit;cursor:pointer}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:2px solid var(--red);outline-offset:2px}

/* ── каркас: боковая колонка + поле ── */
.karkas{display:grid;grid-template-columns:var(--side) minmax(0,1fr);min-height:100vh}
.kolonka{position:sticky;top:0;height:100vh;overflow:auto;border-right:1px solid var(--line);padding:30px 22px 24px 26px;display:flex;flex-direction:column;gap:22px;scrollbar-width:thin}
.znak{text-decoration:none;display:block}
.znak b{display:block;font-size:21px;line-height:1.08;font-weight:800;letter-spacing:-.02em}
.znak span{display:block;margin-top:12px;font-size:13px;line-height:1.45;color:var(--mute)}
.gruppy{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.gruppy li{border-bottom:1px solid var(--line)}
.gruppy a,.gruppy button{display:flex;justify-content:space-between;align-items:center;width:100%;padding:9px 10px;border:0;background:none;text-align:left;text-decoration:none;font-size:14.5px;position:relative;transition:background .2s,color .2s}
.gruppy em{font-style:normal;font-size:13px;color:var(--mute2);font-family:var(--m)}
.gruppy button:hover{background:var(--soft)}
.gruppy [aria-pressed="true"],.gruppy a[aria-current]{background:var(--red);color:#fff;font-weight:600}
.gruppy [aria-pressed="true"] em,.gruppy a[aria-current] em{color:#fff}
.k-mark{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:14.5px;line-height:1.3;padding:8px 10px;border-radius:4px;transition:background .2s}
.k-mark svg{width:26px;height:26px;flex:none}
.k-mark:hover{background:var(--soft)}
.k-mark[aria-current]{background:var(--red);color:#fff;font-weight:600}
.norma{background:var(--soft);border-radius:6px;padding:16px 16px 14px;margin-top:auto}
.norma h3{margin:0 0 6px;font-size:15px;font-weight:700}
.norma p{margin:0;font-size:12.5px;line-height:1.45;color:var(--mute)}
.norma .r{display:flex;align-items:baseline;gap:6px;margin:10px 0 4px;font-family:var(--m);font-size:13px;color:var(--ink2)}
.norma .r b{font-size:26px;font-weight:600;color:var(--ink);letter-spacing:-.02em}
.sloi{position:relative;margin:10px 0 6px;height:150px}
.sloi img{width:136px;height:auto}
.sloi figcaption span{position:absolute;left:112px;font-size:11px;color:var(--ink2);padding-left:22px;white-space:nowrap}
.sloi figcaption span::before{content:"";position:absolute;left:0;top:50%;width:18px;border-top:1px solid var(--ink2)}
.sloi figcaption span::after{content:"";position:absolute;left:-3px;top:calc(50% - 3px);width:6px;height:6px;border-radius:50%;background:var(--ink)}
.norma a{font-size:13px;text-decoration:none;font-weight:500}
.norma a:hover{color:var(--red)}

.pole{padding:28px var(--pad) 80px;min-width:0}
.pole>section,.pole>header{max-width:1120px}

/* ── первый экран ── */
h1{font-size:clamp(38px,5.4vw,76px);line-height:.98;letter-spacing:-.045em;font-weight:800;margin:6px 0 20px}
.lid{font-size:21px;line-height:1.4;color:var(--mute);max-width:760px;margin:0 0 30px;letter-spacing:-.01em}
.vitrina{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:22px;margin:0 0 30px;padding:0;list-style:none}
.vitrina li{min-width:0}
.vitrina button{display:block;width:100%;text-align:left;border:0;background:none;padding:0}
.vitrina .obr{height:150px;display:flex;align-items:flex-end;justify-content:center}
.vitrina .obr img{max-height:150px;max-width:100%;width:auto;filter:drop-shadow(0 14px 14px rgba(0,0,0,.14));transition:transform .5s cubic-bezier(.2,.7,.2,1)}
.vitrina button:hover .obr img{transform:translateY(-8px) rotate(-2deg) scale(1.04)}
.vitrina .n{display:block;margin-top:14px;font:500 12px var(--m);color:var(--mute2)}
.vitrina b{display:block;font-size:17px;font-weight:700;margin-top:2px;letter-spacing:-.01em}
.vitrina small{display:block;font-size:13.5px;line-height:1.4;color:var(--mute);margin-top:4px}
.vitrina button[aria-pressed="true"] b{color:var(--red)}

/* ── фильтры ── */
.filtr{border-top:1px solid var(--line);padding:22px 0 18px;display:grid;grid-template-columns:auto 1fr auto;gap:12px 18px;align-items:center}
.filtr .l{font-size:15px;color:var(--ink2)}
.chipy{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1px solid var(--line);background:var(--soft);border-radius:999px;padding:7px 18px;font-size:14px;transition:background .2s,color .2s,border-color .2s}
.chip:hover{border-color:var(--mute2)}
.chip[aria-pressed="true"]{background:var(--red);border-color:var(--red);color:#fff;font-weight:600}
.sort{grid-column:3;grid-row:2;display:flex;align-items:center;gap:12px;font-size:15px}
.sort select{font:inherit;font-size:14px;border:1px solid var(--line);border-radius:6px;padding:9px 34px 9px 14px;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%231C1D1F' stroke-width='1.6'/%3E%3C/svg%3E") no-repeat right 12px center;-webkit-appearance:none;appearance:none;min-width:210px}
.filtr .itog{grid-column:1/-1;font-size:13px;color:var(--mute);font-family:var(--m)}

/* ── реестр ── */
.reestr{border:1px solid var(--line);border-radius:4px;margin-bottom:22px}
.r-shapka,.r-str{display:grid;grid-template-columns:minmax(0,2.3fr) minmax(0,1fr) minmax(0,1.05fr) minmax(0,1fr) minmax(0,1.3fr) minmax(0,1.5fr) 74px;align-items:center}
.r-shapka{font-size:12px;line-height:1.3;color:var(--ink2);font-weight:600;border-bottom:1px solid var(--line);background:#FCFCFC;position:sticky;top:0;z-index:3}
.r-shapka>*{padding:14px 12px}
.r-shapka small{display:block;font-weight:400;color:var(--mute)}
.r-shapka>:not(:first-child),.r-str>:not(:first-child){border-left:1px solid var(--line2)}
.r-zap{border-bottom:1px solid var(--line)}
.r-zap:last-child{border-bottom:0}
.r-str{min-height:76px;cursor:pointer;transition:background .2s}
.r-str:hover{background:#FAFAFB}
.r-str>*{padding:10px 12px;font-size:14px;align-self:stretch;display:flex;align-items:center}
.r-str .nm{gap:14px;font-weight:600;line-height:1.25;font-size:14.5px}
.r-str .nm img{width:64px;height:52px;object-fit:contain;flex:none;transition:transform .4s}
.r-str:hover .nm img{transform:scale(1.08) rotate(-3deg)}
.r-str .nm i{display:block;font-style:normal;font-weight:400;font-size:12.5px;color:var(--mute);margin-top:2px}
.r-str .chislo{font-family:var(--m);font-size:13.5px;color:var(--ink2)}
.r-str .nelzya{font-size:13px;line-height:1.35;color:var(--ink2)}
.r-str .tol{flex-direction:column;align-items:stretch;justify-content:center;gap:6px}
.shkala{height:10px;background:var(--line2);border-radius:2px;overflow:hidden}
.shkala i{display:block;height:100%;background:var(--red);border-radius:2px;width:0;transition:width .8s cubic-bezier(.2,.7,.2,1)}
.tol b{font-size:15px;font-weight:700;font-family:var(--f)}
.tol b small{font-weight:400;font-size:12px;color:var(--mute)}
.tol .net{font-size:12.5px;color:var(--mute);line-height:1.35}
.r-str .sr{justify-content:center}
.kv{width:22px;height:22px;border:1.6px solid #C9CBCF;border-radius:4px;display:grid;place-items:center;background:#fff;transition:background .2s,border-color .2s}
.kv svg{width:14px;height:14px;opacity:0;color:#fff}
.kv[aria-checked="true"]{background:var(--red);border-color:var(--red)}
.kv[aria-checked="true"] svg{opacity:1}
.r-pod{display:grid;grid-template-columns:1.25fr 1fr 1.15fr 26px;gap:28px;padding:22px 24px 24px 24px;border-top:1px solid var(--line2);background:#fff;animation:vyezd .35s ease}
@keyframes vyezd{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
.r-pod p{margin:0;font-size:14.5px;line-height:1.55;color:var(--ink2)}
.r-pod h4{margin:0 0 10px;font-size:15px;font-weight:700}
.r-pod ul{margin:0;padding:0;list-style:none}
.r-pod li{position:relative;padding-left:16px;font-size:14px;line-height:1.45;margin-bottom:6px;color:var(--ink2)}
.r-pod li::before{content:"";position:absolute;left:0;top:.6em;width:6px;height:6px;border-radius:50%;background:var(--red)}
.r-pod .razd{border-left:1px solid var(--line);padding-left:24px}
.r-pod .zakr{border:0;background:none;padding:0;align-self:start;color:var(--mute2);font-size:22px;line-height:1}
.r-pod .zakr:hover{color:var(--ink)}
.r-pod .ist{grid-column:1/-1;font-size:12px;color:var(--mute);font-family:var(--m);margin-top:-6px}
.esche{display:flex;gap:10px;align-items:center;margin:0 auto 10px;border:0;background:none;font-size:15px;font-weight:500}
.esche svg{width:16px;height:16px;color:var(--red)}
.pusto{padding:34px;text-align:center;color:var(--mute)}

/* ── панель сравнения ── */
.sravn{position:fixed;left:var(--side);right:0;bottom:0;z-index:20;background:rgba(243,243,244,.97);backdrop-filter:blur(6px);border-top:1px solid var(--line);padding:16px var(--pad) 18px;transform:translateY(110%);transition:transform .45s cubic-bezier(.2,.7,.2,1)}
.sravn>*{max-width:1120px}
body.s-est #katalog{padding-bottom:60px}
#katalog+.blok{padding-top:40px}
.sravn.est{transform:none}
.sravn.est.skryt{transform:translateY(110%)}
.sravn h2{font-size:17px;margin:0 0 10px;font-weight:700}
.sravn-ryad{display:grid;grid-template-columns:repeat(3,minmax(0,1fr)) 210px;gap:14px;align-items:stretch}
.sv{background:#fff;border:1px solid var(--line);border-radius:6px;display:flex;align-items:center;gap:14px;padding:10px 14px;position:relative;min-height:74px}
.sv img{width:72px;height:56px;object-fit:contain}
.sv span{font-size:14px;line-height:1.3}
.sv b{display:block;font-size:17px;margin-top:4px}
.sv .x{position:absolute;right:8px;top:6px;border:0;background:none;font-size:20px;color:var(--ink2);padding:2px 6px}
.sv.pust{border-style:dashed;color:var(--mute2);font-size:13px;justify-content:center;background:transparent}
.sv-go{background:var(--red);color:#fff;border:0;border-radius:6px;font-weight:600;font-size:15px;padding:0 16px;transition:filter .2s}
.sv-go:hover{filter:brightness(1.08)}
.sv-tabl{margin-top:14px;background:#fff;border:1px solid var(--line);border-radius:6px;overflow:auto;max-height:52vh}
.sv-tabl table{width:100%;border-collapse:collapse;font-size:14px}
.sv-tabl th,.sv-tabl td{padding:10px 14px;border-bottom:1px solid var(--line2);text-align:left;vertical-align:top}
.sv-tabl th{width:200px;color:var(--mute);font-weight:500}
.sv-tabl td.luch{color:var(--red);font-weight:700}

/* ── столбы ── */
.blok{padding:70px 0 0}
h2{font-size:clamp(28px,3vw,42px);line-height:1.05;letter-spacing:-.035em;font-weight:800;margin:0 0 14px}
.blok>.lid{font-size:18px;margin-bottom:34px}
.stolby{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:22px;align-items:end;height:400px;border-bottom:1px solid var(--line);padding-bottom:0;position:relative}
.stolb{display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%}
.stolb b{font-size:16px;font-weight:700;margin-bottom:10px;white-space:nowrap}
.stolb .tel{width:72%;position:relative;height:0;transition:height 1.1s cubic-bezier(.2,.7,.2,1);background-size:100% auto;background-position:bottom center;box-shadow:inset -10px 0 14px -10px rgba(0,0,0,.35)}
.stolb .tel::before{content:"";position:absolute;left:0;right:-14%;top:-16px;height:16px;background:inherit;background-size:100% auto;filter:brightness(1.18);transform:skewX(-40deg);transform-origin:bottom left}
.stolb .tel::after{content:"";position:absolute;top:-16px;right:-14%;width:14%;bottom:0;background:inherit;filter:brightness(.72);clip-path:polygon(0 16px,100% 0,100% calc(100% - 16px),0 100%)}
.stolby-pod{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:22px;margin-top:12px}
.stolby-pod span{text-align:center;font-size:14px;line-height:1.35;color:var(--ink2)}
.stolby-pod small{display:block;color:var(--mute);font-size:12.5px}
.snoska{font-size:13px;color:var(--mute);margin:18px 0 0;max-width:820px;line-height:1.5}

/* ── вопросы продавцу ── */
.prodavcu{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:0;padding:0;list-style:none}
.prodavcu li{border:1px solid var(--line);border-radius:6px;padding:20px 20px 20px 18px;display:grid;grid-template-columns:56px 1fr;transition:border-color .25s,transform .25s}
.prodavcu li:hover{border-color:var(--ink);transform:translateY(-2px)}
.prodavcu .nn{font-size:30px;line-height:1;color:var(--red);font-weight:400;letter-spacing:-.03em}
.prodavcu b{display:block;font-size:16px;line-height:1.3;margin-bottom:6px}
.prodavcu p{margin:0;font-size:14px;line-height:1.45;color:var(--mute)}

/* ── вопросы и ответы ── */
.faq{border:1px solid var(--line);border-radius:6px}
.faq details{border-bottom:1px solid var(--line)}
.faq details:last-child{border-bottom:0}
.faq summary{list-style:none;cursor:pointer;padding:15px 18px;font-size:16px;display:flex;justify-content:space-between;gap:16px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary svg{width:14px;height:14px;flex:none;transition:transform .3s}
.faq details[open] summary svg{transform:rotate(180deg)}
.faq summary:hover{color:var(--red)}
.faq .otv{padding:0 18px 18px;font-size:15px;line-height:1.6;color:var(--ink2);max-width:900px}
.faq .otv p{margin:0 0 10px}

/* ── подвал ── */
.podval{border-top:1px solid var(--line);margin-top:0;padding:28px var(--pad) 34px 26px;display:grid;grid-template-columns:var(--side) 1.2fr 1.4fr 1fr;gap:20px;align-items:start;font-size:13px;color:var(--mute)}
.podval b{color:var(--ink);font-size:15px;line-height:1.2;display:block}
.podval nav{display:flex;gap:26px;flex-wrap:wrap}
.podval nav a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line)}
.podval nav a:hover{border-color:var(--red)}
.podval p{margin:0}

/* ── появление ── */
.rv{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s cubic-bezier(.2,.7,.2,1)}
.rv.on{opacity:1;transform:none}

/* ── мобильная шапка ── */
.m-shapka{display:none}

@media (max-width:1180px){
  :root{--side:236px;--pad:32px}
  .r-shapka,.r-str{grid-template-columns:minmax(0,2.2fr) minmax(0,.9fr) minmax(0,.95fr) minmax(0,.9fr) minmax(0,1.2fr) minmax(0,1.4fr) 60px}
  .vitrina{gap:14px}
}
@media (max-width:960px){
  .sravn{left:0;padding:12px 16px 14px}
  .vitrina .obr{height:110px}.vitrina .obr img{max-height:110px}
  .karkas{display:block}
  .kolonka{display:none}
  .m-shapka{display:block;position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--line);padding:12px 16px 10px}
  .m-shapka .verh{display:flex;justify-content:space-between;align-items:center;gap:12px}
  .m-shapka .znak b{font-size:16px}
  .m-shapka .k-mark{font-size:13px;padding:6px 8px;gap:6px}
  .m-shapka .k-mark svg{width:20px;height:20px}
  .m-gruppy{display:flex;gap:6px;overflow-x:auto;margin:10px -16px 0;padding:0 16px 2px;scrollbar-width:none}
  .m-gruppy::-webkit-scrollbar{display:none}
  .m-gruppy button{flex:none;border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 12px;font-size:13px;white-space:nowrap}
  .m-gruppy button[aria-pressed="true"]{background:var(--red);border-color:var(--red);color:#fff}
  :root{--pad:16px}
  .pole{padding-top:18px}
  .lid{font-size:17px}
  .vitrina{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px 14px}
  .filtr{grid-template-columns:1fr}
  .filtr .l{margin-bottom:-4px}
  .sort{grid-column:1;grid-row:auto}
  .chipy{flex-wrap:nowrap;overflow-x:auto;margin:0 -16px;padding:0 16px;scrollbar-width:none}
  .chip{flex:none}
  .reestr{border:0;border-top:1px solid var(--line);border-radius:0}
  .r-shapka{display:none}
  .r-str{grid-template-columns:72px minmax(0,1fr) 44px;grid-template-areas:"nm nm sr" "c1 c2 c3" "ne ne ne" "tl tl tl";min-height:0;padding:12px 0}
  .r-str>*{border-left:0!important;padding:4px 0}
  .r-str .nm{grid-area:nm}
  .r-str .sr{grid-area:sr;justify-content:flex-end}
  .r-str .chislo{display:block;font-size:13px}
  .r-str .chislo::before{content:attr(data-l);display:block;font:500 11px var(--f);color:var(--mute)}
  .r-str .c1{grid-area:c1}.r-str .c2{grid-area:c2}.r-str .c3{grid-area:c3}
  .r-str{grid-template-columns:repeat(3,minmax(0,1fr));grid-template-areas:"nm nm sr" "c1 c2 c3" "ne ne ne" "tl tl tl"}
  .r-str .nelzya{grid-area:ne}
  .r-str .nelzya{display:block}
  .r-str .nelzya::before{content:"Где нельзя: ";color:var(--mute)}
  .r-str .tol{grid-area:tl}
  .r-pod{grid-template-columns:1fr;gap:18px;padding:16px 0 22px}
  .r-pod .razd{border-left:0;padding-left:0}
  .r-pod .zakr{display:none}
  .sravn h2{font-size:14px;margin-bottom:8px}
  .sravn-ryad{grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}
  .sv{flex-direction:column;align-items:flex-start;gap:2px;padding:6px 8px;min-height:0}
  .sv img{display:none}
  .sv span{font-size:11.5px;line-height:1.25}.sv b{font-size:13.5px;margin-top:2px}
  .sv .x{top:2px;right:2px;font-size:17px}
  .sv.pust{font-size:11px;text-align:center}
  .sv-go{grid-column:1/-1;padding:10px;font-size:14px}
  .sv-tabl th{width:110px}
  .stolby,.stolby-pod{gap:6px}
  .stolby{height:300px}
  .stolb b{font-size:10.5px;letter-spacing:-.02em}
  .stolby-pod span{font-size:10.5px;line-height:1.25;hyphens:auto;-webkit-hyphens:auto;overflow-wrap:anywhere}
  .stolby-pod small{font-size:10.5px}
  .prodavcu{grid-template-columns:1fr}
  .podval{grid-template-columns:1fr;padding:24px 16px 30px}
  .blok{padding-top:52px}
}
@media (max-width:560px){
  .vitrina{grid-template-columns:repeat(2,minmax(0,1fr))}
  .vitrina li:nth-child(n+5){display:none}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none!important;animation:none!important}
  .rv{opacity:1;transform:none}
}
.sv-h{font-size:17px;margin:0 0 10px;font-weight:700}
.prodavcu a,.faq a,.lid a{color:inherit;text-decoration:underline;text-decoration-color:var(--red);text-underline-offset:3px}
.prodavcu a:hover,.faq a:hover,.lid a:hover{color:var(--red)}
@media (max-width:960px){.sv-h{font-size:14px;margin-bottom:8px}}