/* Layout: архитектурная сетка — тёмная «потолочная» полоса со светящимися линиями сверху, дальше светлый бетонный лист с каталогом на сетке 12 колонок */
:root{
  --bg:#eef0ef;        /* бетон */
  --surface:#f8f9f8;
  --ink:#1c2321;
  --muted:#5d6865;
  --line:#d3d8d6;
  --ceiling:#1e2524;   /* потолочная плита */
  --ceiling-ink:#e9ecea;
  --glow:#ffcf8a;      /* 3000K */
  --glow-cool:#e6f0ff; /* 4000K */
  --accent:#b0651c;    /* тёплая медь для действий */
  --accent-ink:#ffffff;
  --ok:#2f7a4f;
  --display:"Jost","Futura","Century Gothic",system-ui,sans-serif;
  --body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#141918;--surface:#1b2120;--ink:#e6eae8;--muted:#9aa5a1;--line:#2c3533;
  --ceiling:#0d1110;--ceiling-ink:#e9ecea;--accent:#e0954d;--accent-ink:#1a1206;--ok:#6cc391;color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#141918;--surface:#1b2120;--ink:#e6eae8;--muted:#9aa5a1;--line:#2c3533;
  --ceiling:#0d1110;--ceiling-ink:#e9ecea;--accent:#e0954d;--accent-ink:#1a1206;--ok:#6cc391;color-scheme:dark}

*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.55}
a{color:inherit}
.wrap{max-width:1180px;margin:0 auto;padding-inline:20px}
h1,h2,h3{font-family:var(--display);font-weight:400;text-wrap:balance;margin:0;letter-spacing:.01em}
h2{font-size:clamp(28px,4vw,40px);line-height:1.15}
h3{font-size:20px;font-weight:500}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.btn{display:inline-flex;align-items:center;gap:8px;font:500 15px var(--body);padding:13px 22px;border-radius:2px;border:1px solid transparent;cursor:pointer;text-decoration:none;transition:background .2s,color .2s,border-color .2s}
.btn-primary{background:var(--accent);color:var(--accent-ink)}
.btn-primary:hover{filter:brightness(1.08)}
.btn-ghost{background:transparent;border-color:currentColor;color:inherit}
.btn:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- header + hero (потолок) ---------- */
.ceiling{background:var(--ceiling);color:var(--ceiling-ink);position:relative;overflow:hidden}
header.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:color-mix(in srgb,var(--ceiling) 92%,transparent);backdrop-filter:blur(8px);color:var(--ceiling-ink);border-bottom:1px solid rgba(255,255,255,.08)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:14px}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--display);font-size:20px;letter-spacing:.08em;text-transform:uppercase;text-decoration:none}
.logo i{display:block;width:28px;height:4px;border-radius:2px;background:var(--glow);box-shadow:0 0 12px 2px rgba(255,207,138,.7)}
nav.menu{display:flex;gap:22px;font-size:14px}
nav.menu a{text-decoration:none;opacity:.8}
nav.menu a:hover{opacity:1}
.top .phone{font-family:var(--mono);font-size:14px;white-space:nowrap}
@media (max-width:860px){nav.menu{display:none}}
@media (max-width:480px){.top .phone{display:none}}

.hero{position:relative;padding-block:72px 64px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero h1{font-size:clamp(34px,5.4vw,60px);line-height:1.05;font-weight:300}
.hero h1 b{font-weight:500;color:var(--glow)}
.hero p.lead{font-size:18px;color:rgba(233,236,234,.75);max-width:34em;margin:20px 0 28px}
.hero .actions{display:flex;flex-wrap:wrap;gap:12px}
.hero .facts{display:flex;flex-wrap:wrap;gap:28px;margin-top:40px;font-family:var(--mono);font-size:13px;color:rgba(233,236,234,.65)}
.hero .facts b{display:block;font-family:var(--display);font-size:26px;font-weight:400;color:var(--ceiling-ink)}
.lamps{width:100%;max-width:520px;aspect-ratio:1/1;justify-self:center}
.lamps .cable{stroke:rgba(233,236,234,.25);stroke-width:1}
.lamps .tube{stroke:var(--glow);stroke-linecap:round;fill:none;filter:url(#glow)}
.lamps .tube.cool{stroke:var(--glow-cool)}
.lamps .shine{animation:breathe 6s ease-in-out infinite}
@keyframes breathe{0%,100%{opacity:1}50%{opacity:.82}}
@media (prefers-reduced-motion:reduce){.lamps .shine{animation:none}}
@media (max-width:860px){.hero-grid{grid-template-columns:1fr}.lamps{max-width:340px;order:-1}}

/* ---------- sections ---------- */
section{padding-block:72px}
.sec-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:end;gap:16px;margin-bottom:36px}
.sec-head p{max-width:36em;color:var(--muted);margin:10px 0 0}

/* catalog categories */
.cats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.cat{background:var(--surface);padding:22px 20px 20px;display:flex;flex-direction:column;gap:10px;min-width:0;cursor:pointer;text-align:left;border:0;font:inherit;color:inherit;transition:background .2s}
.cat:hover{background:var(--bg)}
.cat svg{width:100%;height:84px}
.cat svg .t{stroke:var(--accent);stroke-width:4;stroke-linecap:round;fill:none}
.cat svg .c{stroke:var(--muted);stroke-width:1;opacity:.6}
.cat .price{font-family:var(--mono);font-size:13px;color:var(--muted)}
.cat p{margin:0;font-size:14px;color:var(--muted)}
@media (max-width:960px){.cats{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.cats{grid-template-columns:1fr}}

/* product table */
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.tab{font:500 14px var(--body);padding:8px 14px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:2px;cursor:pointer}
.tab[aria-selected="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.table-box{overflow-x:auto;border:1px solid var(--line);background:var(--surface)}
table{width:100%;border-collapse:collapse;font-size:14px;min-width:640px}
th,td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
th{font-family:var(--mono);font-weight:400;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums;font-family:var(--mono)}
td.name{font-weight:500}
tr:last-child td{border-bottom:0}
.add{font:500 13px var(--body);padding:6px 12px;border:1px solid var(--accent);color:var(--accent);background:transparent;border-radius:2px;cursor:pointer}
.add[aria-pressed="true"]{background:var(--accent);color:var(--accent-ink)}
.note{font-size:13px;color:var(--muted);margin-top:12px}

/* features */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:40px 32px}
.feature{border-top:1px solid var(--ink);padding-top:16px;min-width:0}
.feature .k{font-family:var(--display);font-size:34px;font-weight:300;line-height:1}
.feature h3{margin:10px 0 6px}
.feature p{margin:0;color:var(--muted);font-size:15px}
.ral{display:flex;gap:3px;margin-top:12px}
.ral span{flex:1;height:10px}
@media (max-width:860px){.features{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.features{grid-template-columns:1fr}}

/* pro block */
.pro{background:var(--ceiling);color:var(--ceiling-ink)}
.pro-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.pro ul{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.pro li{display:flex;gap:14px;align-items:baseline;border-bottom:1px solid rgba(255,255,255,.1);padding-bottom:14px}
.pro li::before{content:"";flex:none;width:18px;height:3px;border-radius:2px;background:var(--glow);box-shadow:0 0 8px rgba(255,207,138,.7);transform:translateY(-4px)}
.pro .eyebrow{color:rgba(233,236,234,.6)}
.pro p{color:rgba(233,236,234,.75)}
@media (max-width:860px){.pro-grid{grid-template-columns:1fr}}

/* steps */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:24px;counter-reset:s}
.step{min-width:0}
.step::before{counter-increment:s;content:counter(s,decimal-leading-zero);display:block;font-family:var(--mono);font-size:13px;color:var(--accent);margin-bottom:10px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.step h3{font-size:17px;margin-bottom:6px}
.step p{margin:0;font-size:14px;color:var(--muted)}
@media (max-width:960px){.steps{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.steps{grid-template-columns:1fr}}

/* request form */
.req-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:start}
.quote{border:1px solid var(--line);background:var(--surface);padding:20px}
.quote h3{margin-bottom:12px}
.quote ul{list-style:none;margin:0;padding:0}
.quote li{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--line);font-size:14px}
.quote li span:first-child{min-width:0;overflow-wrap:anywhere}
.quote li .num{font-family:var(--mono);font-variant-numeric:tabular-nums;white-space:nowrap}
.quote .total{display:flex;justify-content:space-between;padding-top:12px;font-weight:600}
.quote .empty{color:var(--muted);font-size:14px;margin:0}
.rm{border:0;background:none;color:var(--muted);cursor:pointer;font-size:16px;padding:0 0 0 8px}
form.req{display:grid;gap:14px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:520px){.row2{grid-template-columns:1fr}}
label{display:grid;gap:6px;font-size:13px;color:var(--muted)}
input,select,textarea{font:16px var(--body);color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:2px;padding:11px 12px;width:100%}
textarea{min-height:96px;resize:vertical}
.sent{border-left:3px solid var(--ok);padding:12px 16px;background:var(--surface);font-size:14px}
@media (max-width:860px){.req-grid{grid-template-columns:1fr}}

/* footer */
footer{background:var(--ceiling);color:rgba(233,236,234,.7);padding-block:48px;font-size:14px}
.foot{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:32px}
footer h3{color:var(--ceiling-ink);font-size:16px;margin-bottom:10px}
footer .mono{font-family:var(--mono)}
.placeholder{border-bottom:1px dashed rgba(255,207,138,.6)}
@media (max-width:760px){.foot{grid-template-columns:1fr}}

/* примеры применения */
.works-sec{padding-block:64px 24px}
.works{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.work{position:relative;display:block;overflow:hidden;background:var(--ceiling);aspect-ratio:16/10;min-width:0}
.work-big{grid-column:span 2;grid-row:span 2;aspect-ratio:auto}
.work img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .5s ease}
.work:hover img{transform:scale(1.03)}
.work-cap{position:absolute;left:0;right:0;bottom:0;padding:28px 16px 14px;background:linear-gradient(transparent,rgba(10,12,12,.85));color:#eef0ef;font-size:13px;display:grid;gap:2px}
.work-cap b{font-family:var(--display);font-weight:500;font-size:17px}
@media (max-width:760px){.works{grid-template-columns:1fr 1fr}.work-big{grid-column:span 2;grid-row:auto;aspect-ratio:16/10}}
@media (max-width:480px){.works{grid-template-columns:1fr}.work-big{grid-column:auto}}
@media (prefers-reduced-motion:reduce){.work img{transition:none}}