/* =========================================================
   БурСнаб — строгая корпоративная тема. v4
   Палитра: графит + сталь + один акцент (индиго-сталь)
   ========================================================= */
:root{
  --ink:#14181B; --ink-2:#3C444B; --ink-3:#6B747C;
  --line:#DEE2E6; --line-2:#EDF0F2;
  --bg:#FFFFFF; --bg-soft:#F7F8F9; --bg-2:#F0F2F4;
  --steel:#1B3A57; --steel-2:#27547C; --steel-soft:#EAF0F6;
  --ok:#2E7D53; --ok-soft:#E9F2EC;
  --warn:#A9682A; --warn-soft:#F8EFE4;
  --wrap:1180px;
  --f: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --r:3px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 var(--f);letter-spacing:.001em}
img{max-width:100%;display:block}
a{color:var(--steel);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{margin:0;font-weight:650;letter-spacing:-.012em;line-height:1.18}
h1{font-size:clamp(30px,4.2vw,46px)}
h2{font-size:clamp(23px,2.6vw,30px)}
h3{font-size:18px}
p{margin:0 0 14px}
small{font-size:13px}
hr{border:0;border-top:1px solid var(--line);margin:0}
:focus-visible{outline:2px solid var(--steel-2);outline-offset:2px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;background:#fff;padding:8px 12px;z-index:99;border:1px solid var(--ink)}

/* ---------- служебные ---------- */
.label{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-3);font-weight:650;margin:0 0 10px}
.lead{font-size:17px;color:var(--ink-2);max-width:70ch}
.muted{color:var(--ink-3)}
.mono{font-variant-numeric:tabular-nums}

/* ---------- кнопки ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:11px 20px;border:1px solid var(--steel);
  background:var(--steel);color:#fff;font:inherit;font-weight:600;font-size:15px;border-radius:var(--r);cursor:pointer;transition:.15s}
.btn:hover{background:var(--steel-2);border-color:var(--steel-2);text-decoration:none}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{background:var(--bg-2);border-color:var(--ink-3)}
.btn.light{background:#fff;color:var(--steel);border-color:#fff}
.btn.light:hover{background:var(--steel-soft);border-color:var(--steel-soft)}
.btn.sm{min-height:38px;padding:8px 14px;font-size:14px}
.btn.block{width:100%;justify-content:center}
.btn[disabled]{opacity:.55;cursor:default}

/* ---------- хедер ---------- */
.topbar{background:var(--ink);color:#C6CDD3;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;gap:16px;padding:8px 24px}
.topbar strong{color:#fff;font-weight:600}
header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.96);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line)}
.hrow{display:flex;align-items:center;gap:24px;min-height:70px}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand svg{width:34px;height:34px;flex:none}
.bname{font-weight:700;letter-spacing:.07em;font-size:17px;display:block}
.bsub{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);display:block}
nav{margin-left:auto;display:flex;gap:2px;flex-wrap:wrap}
nav a{padding:9px 12px;font-size:15px;color:var(--ink-2);border-radius:var(--r)}
nav a:hover{background:var(--bg-2);text-decoration:none}
nav a.on{color:var(--ink);font-weight:600;box-shadow:inset 0 -2px 0 var(--steel)}
.hr-right{display:flex;align-items:center;gap:12px}
.hphone{font-weight:650;color:var(--ink);white-space:nowrap}
.count{display:inline-grid;place-items:center;min-width:20px;height:20px;padding:0 5px;background:#fff;color:var(--steel);border-radius:10px;font-size:12px;font-weight:700}
.burger{display:none;width:58px;height:44px;border:1px solid var(--line);background:#fff;border-radius:var(--r);font-size:0;cursor:pointer}
.burger::before{content:"Меню";font-size:13px;font-weight:600;color:var(--ink)}

/* ---------- hero ---------- */
.hero{border-bottom:1px solid var(--line);background:
  linear-gradient(180deg,#fff 0%,var(--bg-soft) 100%)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;padding:56px 0 44px;align-items:start}
.hero h1{margin-bottom:18px}
.hero h1 em{font-style:normal;color:var(--steel)}
.hero .lead{margin-bottom:24px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:26px}
.hero-note{display:flex;gap:12px;padding:14px 16px;border:1px solid var(--line);background:#fff;border-radius:var(--r);font-size:14px;color:var(--ink-2)}
.hero-note b{color:var(--ink);display:block}
.hero-fig{border:1px solid var(--line);background:#fff;border-radius:var(--r);overflow:hidden}
.hero-fig img{width:100%;height:330px;object-fit:cover}
.hero-fig figcaption{display:flex;justify-content:space-between;gap:12px;padding:12px 16px;border-top:1px solid var(--line);font-size:13px;color:var(--ink-3)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:var(--r);background:#fff;margin-bottom:-1px}
.stats div{padding:18px 20px;border-right:1px solid var(--line)}
.stats div:last-child{border-right:0}
.stats small{display:block;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-3);margin-bottom:6px}
.stats strong{font-size:19px;font-weight:650;letter-spacing:-.01em}

/* ---------- секции ---------- */
section{padding:64px 0}
section.tight{padding:44px 0}
section.soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
section.dark{background:var(--ink);color:#E7EBEE;border:0}
section.dark h2,section.dark h3{color:#fff}
section.dark .label{color:#8D979F}
section.dark p{color:#BFC7CD}
.shead{display:grid;grid-template-columns:1.1fr .9fr;gap:32px;align-items:end;margin-bottom:32px}
.shead p{margin:0;color:var(--ink-3);font-size:15px}

/* ---------- сетка категорий ---------- */
.grid-cats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.cat{background:#fff;padding:26px 24px 22px;display:flex;flex-direction:column;gap:8px;color:var(--ink)}
.cat:hover{background:var(--bg-soft);text-decoration:none}
.cat .n{font-size:12px;color:var(--ink-3);letter-spacing:.08em;text-transform:uppercase}
.cat p{font-size:14px;color:var(--ink-2);margin:0;flex:1}
.cat .go{font-size:14px;color:var(--steel);font-weight:600}

/* ---------- карточки товаров ---------- */
.grid-prod{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--r);background:#fff;overflow:hidden;transition:.15s}
.card:hover{border-color:var(--ink-3)}
.card-ph{position:relative;background:var(--bg-2);aspect-ratio:4/3;overflow:hidden}
.card-ph img{width:100%;height:100%;object-fit:contain;background:#fff;padding:12px;cursor:zoom-in;transition:transform .3s}
.card:hover .card-ph img{transform:scale(1.03)}
.badges{position:absolute;left:10px;top:10px;display:flex;gap:6px;flex-wrap:wrap}
.tag{font-size:11px;letter-spacing:.06em;text-transform:uppercase;font-weight:700;padding:4px 8px;border-radius:2px;background:#fff;border:1px solid var(--line);color:var(--ink-2)}
.tag.ok{background:var(--ok-soft);border-color:#C7E0D1;color:var(--ok)}
.tag.wait{background:var(--warn-soft);border-color:#E8D5BC;color:var(--warn)}
.card-body{padding:18px;display:flex;flex-direction:column;gap:12px;flex:1}
.card h3{font-size:16.5px;line-height:1.3}
.card h3 a{color:var(--ink)}
.card .art{font-size:12px;color:var(--ink-3);letter-spacing:.04em}
.spec-mini{display:grid;gap:5px;font-size:13.5px;color:var(--ink-2);margin:0;padding:0;list-style:none}
.spec-mini li{display:flex;justify-content:space-between;gap:12px;border-bottom:1px dashed var(--line-2);padding-bottom:4px}
.spec-mini b{font-weight:600;color:var(--ink);text-align:right}
.card-foot{margin-top:auto;display:grid;grid-template-columns:minmax(0,1fr);gap:14px;padding-top:6px}
.price{font-size:19px;font-weight:700;letter-spacing:-.01em;min-width:0}
.price small{display:block;font-size:11.5px;font-weight:500;color:var(--ink-3);letter-spacing:.02em}
.card-actions{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:8px;width:100%}
.card-actions .btn{width:100%;justify-content:center;min-width:0;padding-left:10px;padding-right:10px;white-space:nowrap}

/* ---------- фильтры каталога ---------- */
.cat-layout{display:grid;grid-template-columns:250px minmax(0,1fr);gap:32px;align-items:start}
.cat-layout>*{min-width:0}
.side{position:sticky;top:90px;border:1px solid var(--line);border-radius:var(--r);background:#fff}
.side h3{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);padding:16px 18px 0}
.side-list{display:flex;flex-direction:column;padding:10px 0 14px}
.side-list a{padding:9px 18px;font-size:14.5px;color:var(--ink-2);display:flex;justify-content:space-between;gap:10px}
.side-list a:hover{background:var(--bg-soft);text-decoration:none}
.side-list a.on{color:var(--ink);font-weight:650;box-shadow:inset 3px 0 0 var(--steel);background:var(--bg-soft)}
.side-list span{color:var(--ink-3);font-size:13px}
.toolbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:22px}
.field{display:flex;flex-direction:column;gap:6px}
input[type=text],input[type=tel],input[type=email],input[type=search],select,textarea{
  font:inherit;font-size:15px;padding:10px 12px;border:1px solid var(--line);border-radius:var(--r);background:#fff;color:var(--ink);min-height:44px}
textarea{min-height:96px;resize:vertical}
input:hover,select:hover,textarea:hover{border-color:var(--ink-3)}
.search{flex:1;min-width:220px}
.chip-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.chip{font-size:13.5px;padding:7px 12px;border:1px solid var(--line);border-radius:100px;background:#fff;cursor:pointer;color:var(--ink-2)}
.chip.on{background:var(--ink);border-color:var(--ink);color:#fff}

/* ---------- страница товара ---------- */
.crumbs{font-size:13px;color:var(--ink-3);padding:18px 0;border-bottom:1px solid var(--line-2)}
.crumbs a{color:var(--ink-3)}
.crumbs span{margin:0 7px}
.prod{display:grid;grid-template-columns:1fr 1fr;gap:44px;padding:36px 0 8px;align-items:start}
.gallery{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff}
.gallery .main{aspect-ratio:4/3;background:var(--bg-2)}
.gallery .main img{width:100%;height:100%;object-fit:contain;background:#fff;padding:18px;cursor:zoom-in}
.thumbs{display:flex;gap:1px;background:var(--line);border-top:1px solid var(--line)}
.thumbs button{flex:1;padding:0;border:0;background:#fff;cursor:pointer;aspect-ratio:16/10}
.thumbs img{width:100%;height:100%;object-fit:cover;opacity:.62}
.thumbs button.on img,.thumbs button:hover img{opacity:1}
.ph-hint{font-size:12px;color:var(--ink-3);padding:10px 14px;border-top:1px solid var(--line);display:flex;gap:8px;align-items:center}
.prod-h1{font-size:clamp(24px,3vw,33px);margin-bottom:10px}
.prod-meta{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px}
.buybox{border:1px solid var(--line);border-radius:var(--r);padding:20px;background:var(--bg-soft);margin:20px 0}
.buybox .price{font-size:27px}
.buybox-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.qty{display:inline-flex;border:1px solid var(--line);border-radius:var(--r);background:#fff;overflow:hidden}
.qty button{width:40px;border:0;background:#fff;font-size:17px;cursor:pointer;color:var(--ink-2)}
.qty button:hover{background:var(--bg-2)}
.qty output{min-width:44px;display:grid;place-items:center;font-weight:650;border-left:1px solid var(--line);border-right:1px solid var(--line)}
table.spec{width:100%;border-collapse:collapse;font-size:15px}
table.spec th,table.spec td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line-2);vertical-align:top}
table.spec th{width:44%;font-weight:500;color:var(--ink-3)}
table.spec td{font-weight:600}
table.spec tr:hover{background:var(--bg-soft)}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin:40px 0 22px;flex-wrap:wrap}
.tabs button{border:0;background:none;font:inherit;font-size:15px;font-weight:600;color:var(--ink-3);padding:12px 14px;cursor:pointer}
.tabs button.on{color:var(--ink);box-shadow:inset 0 -2px 0 var(--steel)}
.panel[hidden]{display:none}
.cols-2{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.fact{border:1px solid var(--line);border-radius:var(--r);padding:18px;background:#fff}
.fact b{display:block;margin-bottom:6px}
.fact span{font-size:14px;color:var(--ink-2)}

/* ---------- выгода / презентация ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.step{background:#fff;padding:24px 22px}
.step .no{font-size:12px;font-weight:700;letter-spacing:.1em;color:var(--steel);margin-bottom:10px}
.step p{font-size:14px;color:var(--ink-2);margin:0}
section.dark .step{background:#1C2226}
section.dark .step .no{color:#7FB2DC}
.compare{width:100%;border-collapse:collapse;font-size:15px;background:#fff;border:1px solid var(--line);border-radius:var(--r)}
.compare th,.compare td{padding:14px 16px;border-bottom:1px solid var(--line-2);text-align:left}
.compare thead th{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-3);background:var(--bg-soft)}
.compare td.yes{color:var(--ok);font-weight:600}
.compare td.no{color:var(--ink-3)}
.compare tbody tr:last-child td{border-bottom:0}
.slides{display:grid;gap:20px}
.slide{border:1px solid var(--line);border-radius:var(--r);background:#fff;padding:30px;display:grid;grid-template-columns:64px 1fr;gap:22px}
.slide .big{font-size:34px;font-weight:700;color:var(--steel);letter-spacing:-.03em}
.slide h3{margin-bottom:8px;font-size:20px}
.slide p{margin:0;color:var(--ink-2)}
.calc{border:1px solid var(--line);border-radius:var(--r);background:#fff;padding:24px}
.calc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.calc-out{margin-top:20px;padding:18px;border:1px solid var(--steel);border-left-width:3px;border-radius:var(--r);background:var(--steel-soft)}
.calc-out b{font-size:22px}

/* ---------- форма заявки ---------- */
.req{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form-grid .full{grid-column:1/-1}
label.lb{font-size:13px;font-weight:600;color:var(--ink-2)}
.basket{border:1px solid var(--line);border-radius:var(--r);background:#fff;padding:8px 0;margin-bottom:14px;max-height:290px;overflow:auto}
.basket-empty{padding:14px 18px;margin:0;font-size:14px;color:var(--ink-3)}
.bitem{display:flex;gap:12px;align-items:center;justify-content:space-between;padding:11px 16px;border-bottom:1px solid var(--line-2);font-size:14px}
.bitem:last-child{border-bottom:0}
.bitem .rm{width:32px;height:32px;border:1px solid var(--line);background:#fff;border-radius:var(--r);cursor:pointer;color:var(--ink-3)}
.consent{display:flex;gap:9px;font-size:13px;color:var(--ink-3);align-items:flex-start}
.consent input{margin-top:3px}

/* ---------- футер ---------- */
footer{background:var(--ink);color:#A9B2B9;padding:52px 0 28px;font-size:14.5px}
footer h4{color:#fff;font-size:12px;letter-spacing:.12em;text-transform:uppercase;margin-bottom:14px}
footer a{color:#D3D9DE}
.fgrid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:32px;padding-bottom:32px;border-bottom:1px solid #2A3238}
.fgrid ul{list-style:none;margin:0;padding:0;display:grid;gap:9px}
.fbot{display:flex;justify-content:space-between;gap:16px;padding-top:22px;font-size:13px;color:#7E888F;flex-wrap:wrap}

/* ---------- lightbox ---------- */
.lb{position:fixed;inset:0;z-index:90;background:rgba(10,13,15,.93);display:none;align-items:center;justify-content:center;padding:32px}
.lb.open{display:flex}
.lb img{max-width:min(1100px,94vw);max-height:84vh;object-fit:contain;border-radius:var(--r)}
.lb-cap{position:absolute;left:0;right:0;bottom:22px;text-align:center;color:#D8DEE3;font-size:14px;padding:0 24px}
.lb-x,.lb-nav{position:absolute;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);color:#fff;width:46px;height:46px;border-radius:50%;font-size:20px;cursor:pointer}
.lb-x{top:22px;right:22px}
.lb-nav.prev{left:22px;top:50%;transform:translateY(-50%)}
.lb-nav.next{right:22px;top:50%;transform:translateY(-50%)}
.toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,18px);background:var(--ink);color:#fff;padding:13px 20px;border-radius:var(--r);font-size:14.5px;z-index:95;opacity:0;pointer-events:none;transition:.2s;max-width:90vw}
.toast.show,.toast.on{opacity:1;transform:translate(-50%,0)}

/* ---------- адаптив ---------- */
@media(max-width:1000px){
  .hero-grid,.prod,.req,.cols-2{grid-template-columns:1fr;gap:28px}
  .grid-cats,.grid-prod{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .stats div:nth-child(2){border-right:0}
  .cat-layout{grid-template-columns:minmax(0,1fr)}
  .side{position:static}
  .shead{grid-template-columns:1fr}
  .calc-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  section{padding:44px 0}
  .topbar .wrap span:last-child{display:none}
  .burger{display:block;margin-left:auto}
  nav{display:none;order:9;width:100%;margin:0;border-top:1px solid var(--line);padding:8px 0}
  nav.open{display:flex;flex-direction:column}
  .hrow{flex-wrap:wrap;gap:10px}
  .hphone{display:none}
  .grid-cats,.grid-prod,.form-grid,.calc-grid{grid-template-columns:1fr}
  .card-actions{grid-template-columns:1fr 1fr}
  .side h3{padding:14px 14px 0}
  .side-list{flex-direction:row;overflow-x:auto;padding:10px;gap:8px;scrollbar-width:thin}
  .side-list a{flex:none;padding:8px 11px;border:1px solid var(--line);border-radius:var(--r);white-space:nowrap}
  .side-list a.on{box-shadow:none;background:var(--steel);border-color:var(--steel);color:#fff}
  .side-list a.on span{color:#fff}
  .side>.fact{display:none}
  .steps{grid-template-columns:1fr}
  .fgrid{grid-template-columns:1fr 1fr}
  .slide{grid-template-columns:1fr;gap:10px;padding:22px}
  .hero-fig img{height:230px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* ---- v7: подписи полей, калькулятор, договорная цена ---- */
.field .hint{display:block;margin-top:6px;font-size:12.5px;line-height:1.45;color:var(--ink-3)}
.price small{display:block;margin-top:4px;font-size:11.5px;font-weight:400;letter-spacing:0;color:var(--ink-3);text-transform:none}
.ok-msg{margin-top:12px;padding:12px 14px;border:1px solid #BFE0CC;background:#F1F8F3;color:#1F5C3D;font-size:14px}
.calc-out{margin-top:20px;border:1px solid var(--line);background:var(--bg-soft)}
.calc-out .row{display:flex;justify-content:space-between;gap:16px;padding:12px 18px;border-bottom:1px solid var(--line);font-size:14.5px}
.calc-out .row span{color:var(--ink-2)}
.calc-out .row b{white-space:nowrap}
.calc-out .row.total{background:#fff;font-size:17px;padding:16px 18px;border-bottom:none}
.calc-out .row.total b{color:var(--steel)}
.calc-how{margin-top:16px;border:1px solid var(--line);background:#fff}
.calc-how summary{padding:12px 16px;cursor:pointer;font-size:14px;font-weight:600;color:var(--steel)}
.calc-how p{padding:0 16px 12px;margin:0;font-size:13.5px;line-height:1.6;color:var(--ink-2)}
.calc-how p:last-child{padding-bottom:16px}