/* =========================================================
   杭州众驰建筑材料有限公司 · zhongchi.vip
   Design language referenced from corian.cn editorial style
   ========================================================= */

:root{
  --ink:#121417;
  --ink-2:#2b3138;
  --body:#5d646d;
  --muted:#8b9199;
  --line:#e6e2dc;
  --paper:#ffffff;
  --paper-2:#f6f4f1;
  --paper-3:#efece7;
  --accent:#b0724a;
  --accent-dark:#8f5a3a;
  --accent-soft:#f2e6dc;
  --header-h:76px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  color:var(--ink);
  background:var(--paper);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit}

::selection{background:var(--accent);color:#fff}

.container{width:min(1240px,92vw);margin-inline:auto}

/* ---------- Typography ---------- */
.kicker{
  display:inline-flex;align-items:center;gap:12px;
  font-size:12px;letter-spacing:.28em;text-transform:uppercase;
  color:var(--accent);font-weight:600;
}
.kicker::before{content:"";width:34px;height:1px;background:var(--accent)}
.kicker--light{color:rgba(255,255,255,.75)}
.kicker--light::before{background:rgba(255,255,255,.6)}

.section-head{max-width:720px;margin-bottom:56px}
.section-head h1,
.section-head h2{
  font-size:clamp(28px,3.6vw,44px);
  line-height:1.28;font-weight:600;letter-spacing:.01em;
  margin-top:18px;
}
.section-head p{color:var(--body);margin-top:18px;font-size:16.5px}
.section-head--center{margin-inline:auto;text-align:center}
.section-head--center .kicker::before{display:none}

.section{padding:clamp(72px,9vw,128px) 0}
.section--alt{background:var(--paper-2)}
.section--tight{padding:clamp(56px,6vw,88px) 0}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:15px 32px;border:1px solid var(--ink);
  font-size:14px;letter-spacing:.14em;font-weight:500;
  cursor:pointer;background:transparent;color:var(--ink);
  transition:all .35s var(--ease);position:relative;overflow:hidden;
}
.btn span{position:relative;z-index:1}
.btn::after{
  content:"";position:absolute;inset:0;background:var(--ink);
  transform:translateY(101%);transition:transform .38s var(--ease);
}
.btn:hover{color:#fff;border-color:var(--ink)}
.btn:hover::after{transform:translateY(0)}
.btn--solid{background:var(--ink);color:#fff;border-color:var(--ink)}
.btn--solid::after{background:var(--accent)}
.btn--solid:hover{border-color:var(--accent)}
.btn--light{border-color:rgba(255,255,255,.7);color:#fff}
.btn--light::after{background:#fff}
.btn--light:hover{color:var(--ink);border-color:#fff}
.btn--accent{background:var(--accent);border-color:var(--accent);color:#fff}
.btn--accent::after{background:var(--accent-dark)}
.btn--accent:hover{border-color:var(--accent-dark)}

.text-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;font-weight:600;letter-spacing:.08em;color:var(--accent);
}
.text-link svg{transition:transform .3s var(--ease)}
.text-link:hover svg{transform:translateX(5px)}

/* ---------- Header ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:200;
  height:var(--header-h);
  transition:background .4s var(--ease),box-shadow .4s var(--ease),height .4s var(--ease);
}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:100%}
.site-header:not(.solid){color:#fff}
.site-header:not(.solid) .brand-sub{color:rgba(255,255,255,.65)}
.site-header.solid{
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(12px);
  box-shadow:0 1px 0 var(--line),0 8px 30px rgba(18,20,23,.06);
  height:68px;color:var(--ink);
}
.brand{display:flex;align-items:center;gap:12px}
.brand-mark{width:38px;height:38px;flex:none}
.brand-mark svg{width:100%;height:100%;display:block}
.brand-name{display:flex;flex-direction:column;line-height:1.2}
.brand-name b{font-size:19px;font-weight:700;letter-spacing:.14em}
.brand-sub{font-size:9.5px;letter-spacing:.22em;color:var(--muted);text-transform:uppercase}

.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{
  position:relative;display:block;padding:10px 18px;
  font-size:15px;font-weight:500;letter-spacing:.06em;
}
.main-nav a::after{
  content:"";position:absolute;left:18px;right:18px;bottom:4px;height:2px;
  background:var(--accent);transform:scaleX(0);transform-origin:left;
  transition:transform .3s var(--ease);
}
.main-nav a:hover::after,.main-nav a.active::after{transform:scaleX(1)}

.nav-toggle{
  display:none;width:44px;height:44px;border:0;background:transparent;
  cursor:pointer;position:relative;z-index:320;
}
.nav-toggle i{
  display:block;width:24px;height:2px;background:currentColor;margin:5px auto;
  transition:transform .3s var(--ease),opacity .3s var(--ease);
}
.nav-toggle.open i:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open i:nth-child(2){opacity:0}
.nav-toggle.open i:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.mobile-nav{
  position:fixed;inset:0;z-index:300;background:var(--ink);
  display:flex;flex-direction:column;justify-content:center;
  padding:0 8vw;
  clip-path:circle(0% at calc(100% - 44px) 38px);
  transition:clip-path .6s var(--ease);
  visibility:hidden;
}
.mobile-nav.open{clip-path:circle(150% at calc(100% - 44px) 38px);visibility:visible}
.mobile-nav a{
  color:#fff;font-size:26px;font-weight:600;letter-spacing:.1em;
  padding:14px 0;border-bottom:1px solid rgba(255,255,255,.1);
  display:flex;justify-content:space-between;align-items:center;
  opacity:0;transform:translateY(14px);transition:opacity .4s var(--ease),transform .4s var(--ease);
}
.mobile-nav.open a{opacity:1;transform:none}
.mobile-nav.open a:nth-child(2){transition-delay:.06s}
.mobile-nav.open a:nth-child(3){transition-delay:.12s}
.mobile-nav.open a:nth-child(4){transition-delay:.18s}
.mobile-nav.open a:nth-child(5){transition-delay:.24s}
.mobile-nav.open a:nth-child(6){transition-delay:.3s}
.mobile-nav a small{font-size:11px;letter-spacing:.2em;color:rgba(255,255,255,.4);font-weight:400}

/* ---------- Hero (home) ---------- */
.hero{
  position:relative;min-height:100vh;
  display:flex;align-items:flex-end;
  color:#fff;overflow:hidden;
  isolation:isolate;
}
.hero-media{position:absolute;inset:0;z-index:-2}
.hero-media img{width:100%;height:100%;object-fit:cover;transform:scale(1.08);animation:heroZoom 9s var(--ease) forwards}
@keyframes heroZoom{to{transform:scale(1)}}
.hero::after{
  content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(to top,rgba(10,11,13,.78) 0%,rgba(10,11,13,.35) 42%,rgba(10,11,13,.25) 100%);
}
.hero-inner{width:min(1240px,92vw);margin-inline:auto;padding:0 0 12vh}
.hero-kicker{font-size:13px;letter-spacing:.42em;text-transform:uppercase;color:rgba(255,255,255,.72);font-weight:500}
.hero h1{
  font-size:clamp(38px,6.2vw,78px);
  line-height:1.16;font-weight:700;letter-spacing:.02em;
  margin:26px 0 8px;
}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p{
  max-width:620px;font-size:clamp(15px,1.4vw,18px);
  color:rgba(255,255,255,.82);margin-top:22px;
}
.hero-actions{display:flex;gap:16px;margin-top:44px;flex-wrap:wrap}

.hero-scroll{
  position:absolute;left:50%;bottom:34px;transform:translateX(-50%);
  display:flex;flex-direction:column;align-items:center;gap:10px;
  font-size:10px;letter-spacing:.3em;text-transform:uppercase;color:rgba(255,255,255,.6);
}
.hero-scroll i{display:block;width:1px;height:52px;background:rgba(255,255,255,.35);position:relative;overflow:hidden}
.hero-scroll i::after{
  content:"";position:absolute;left:0;top:-50%;width:100%;height:50%;
  background:#fff;animation:scrollHint 2.2s var(--ease) infinite;
}
@keyframes scrollHint{to{top:110%}}

/* ---------- Page hero (subpages) ---------- */
.page-hero{
  position:relative;padding:calc(var(--header-h) + 96px) 0 104px;
  color:#fff;overflow:hidden;isolation:isolate;
}
.page-hero .hero-media{z-index:-2}
.page-hero::after{
  content:"";position:absolute;inset:0;z-index:-1;
  background:linear-gradient(to bottom,rgba(10,11,13,.72),rgba(10,11,13,.45));
}
.page-hero .container{position:relative}
.breadcrumb{
  display:flex;gap:10px;align-items:center;
  font-size:13px;letter-spacing:.1em;color:rgba(255,255,255,.65);margin-bottom:22px;
}
.breadcrumb a{color:rgba(255,255,255,.65)}
.breadcrumb a:hover{color:#fff}
.breadcrumb span::before{content:"/";margin-right:10px;opacity:.5}
.page-hero h1{font-size:clamp(34px,5vw,58px);font-weight:700;letter-spacing:.03em}
.page-hero p{max-width:640px;color:rgba(255,255,255,.8);margin-top:18px}

/* ---------- Intro split ---------- */
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:clamp(40px,6vw,96px);align-items:center}
.split-media{position:relative}
.split-media img{width:100%;aspect-ratio:4/3;object-fit:cover}
.split-media::after{
  content:"";position:absolute;right:-22px;bottom:-22px;width:60%;height:60%;
  border:1px solid var(--accent);z-index:-1;
}
.split-body h2{font-size:clamp(26px,3vw,40px);line-height:1.3;font-weight:600;margin-top:18px}
.split-body>p{color:var(--body);margin-top:20px}
.feature-list{margin-top:34px;display:grid;gap:0}
.feature-list li{
  display:flex;gap:18px;padding:20px 0;border-top:1px solid var(--line);
}
.feature-list li:last-child{border-bottom:1px solid var(--line)}
.feature-list .no{
  font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.1em;
  font-variant-numeric:tabular-nums;padding-top:2px;min-width:34px;
}
.feature-list b{display:block;font-size:17px;font-weight:600}
.feature-list p{color:var(--body);font-size:15px;margin-top:4px}

/* ---------- Stats band ---------- */
.stats{background:var(--ink);color:#fff;position:relative;overflow:hidden}
.stats::before{
  content:"";position:absolute;inset:0;
  background-image:url("../img/texture-dark.jpg");
  background-size:cover;background-position:center;opacity:.16;
}
.stats .container{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:32px;padding:clamp(56px,6vw,84px) 0}
.stat{text-align:left;border-left:1px solid rgba(255,255,255,.18);padding-left:28px}
.stat b{
  display:flex;align-items:baseline;gap:4px;
  font-size:clamp(38px,4.4vw,58px);font-weight:700;line-height:1;
  font-variant-numeric:tabular-nums;letter-spacing:.01em;
}
.stat b i{font-style:normal;font-size:20px;color:var(--accent)}
.stat span{display:block;margin-top:12px;font-size:14px;color:rgba(255,255,255,.65);letter-spacing:.06em}

/* ---------- Product cards ---------- */
.card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.card-grid--3{grid-template-columns:repeat(3,1fr)}
.card-grid--2{grid-template-columns:repeat(2,1fr)}

.p-card{position:relative;overflow:hidden;background:var(--paper);display:block}
.p-card .thumb{position:relative;overflow:hidden;aspect-ratio:4/3;background:var(--paper-3)}
.p-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .8s var(--ease)}
.p-card:hover .thumb img{transform:scale(1.06)}
.p-card .body{padding:24px 4px 0}
.p-card .cat{font-size:11.5px;letter-spacing:.2em;color:var(--accent);text-transform:uppercase;font-weight:600}
.p-card h3{font-size:19px;font-weight:600;margin-top:10px;line-height:1.4}
.p-card p{font-size:14.5px;color:var(--body);margin-top:8px}
.p-card .more{
  margin-top:16px;display:inline-flex;align-items:center;gap:8px;
  font-size:13px;letter-spacing:.12em;color:var(--ink);font-weight:600;
}
.p-card .more::after{content:"→";color:var(--accent);transition:transform .3s var(--ease)}
.p-card:hover .more::after{transform:translateX(5px)}

/* Numbered index card (products page) */
.p-card--index .thumb::after{
  content:attr(data-index);
  position:absolute;top:16px;left:18px;
  font-size:13px;font-weight:700;letter-spacing:.08em;color:#fff;
  background:rgba(18,20,23,.55);padding:5px 11px;backdrop-filter:blur(4px);
}

/* ---------- Project cards ---------- */
.proj-card{position:relative;display:block;overflow:hidden;isolation:isolate}
.proj-card .thumb{aspect-ratio:4/3;overflow:hidden;background:var(--paper-3)}
.proj-card img{width:100%;height:100%;object-fit:cover;transition:transform .9s var(--ease)}
.proj-card:hover img{transform:scale(1.07)}
.proj-card .veil{
  position:absolute;inset:0;z-index:1;
  background:linear-gradient(to top,rgba(10,11,13,.82) 0%,rgba(10,11,13,.1) 55%,transparent 100%);
}
.proj-card .meta{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:28px;color:#fff;
}
.proj-card .meta small{
  font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  color:rgba(255,255,255,.72);font-weight:600;
}
.proj-card .meta h3{font-size:21px;font-weight:600;margin-top:8px}
.proj-card .meta p{
  max-height:0;overflow:hidden;opacity:0;
  font-size:14px;color:rgba(255,255,255,.8);margin-top:0;
  transition:max-height .5s var(--ease),opacity .5s var(--ease),margin .5s var(--ease);
}
.proj-card:hover .meta p{max-height:90px;opacity:1;margin-top:10px}

/* ---------- News ---------- */
.n-card{display:block;background:var(--paper);border:1px solid var(--line);transition:box-shadow .35s var(--ease),transform .35s var(--ease)}
.n-card:hover{box-shadow:0 22px 50px rgba(18,20,23,.1);transform:translateY(-4px)}
.n-card .thumb{aspect-ratio:16/9;overflow:hidden;background:var(--paper-3)}
.n-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .8s var(--ease)}
.n-card:hover .thumb img{transform:scale(1.05)}
.n-card .body{padding:26px 26px 30px}
.n-card time{font-size:12.5px;letter-spacing:.14em;color:var(--muted);font-variant-numeric:tabular-nums}
.n-card h3{font-size:18px;font-weight:600;line-height:1.5;margin-top:10px}
.n-card p{font-size:14.5px;color:var(--body);margin-top:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- CTA band ---------- */
.cta{
  position:relative;overflow:hidden;color:#fff;isolation:isolate;text-align:center;
  padding:clamp(80px,10vw,140px) 0;
}
.cta .bg{position:absolute;inset:0;z-index:-2}
.cta .bg img{width:100%;height:100%;object-fit:cover}
.cta::after{content:"";position:absolute;inset:0;z-index:-1;background:rgba(12,13,15,.72)}
.cta h2{font-size:clamp(30px,4.4vw,52px);font-weight:700;letter-spacing:.03em}
.cta p{max-width:560px;margin:20px auto 0;color:rgba(255,255,255,.78)}
.cta .actions{margin-top:44px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ---------- Values (about) ---------- */
.value-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line)}
.value{background:var(--paper);padding:44px 32px}
.value .no{font-size:13px;font-weight:700;color:var(--accent);letter-spacing:.1em}
.value h3{font-size:20px;font-weight:600;margin-top:16px}
.value p{font-size:14.5px;color:var(--body);margin-top:12px}

/* ---------- Timeline (about) ---------- */
.timeline{border-left:1px solid var(--line);margin-left:6px}
.timeline li{position:relative;padding:0 0 40px 36px}
.timeline li::before{
  content:"";position:absolute;left:-5px;top:10px;width:9px;height:9px;
  border-radius:50%;background:var(--accent);
}
.timeline time{font-size:13px;font-weight:700;letter-spacing:.12em;color:var(--accent)}
.timeline h4{font-size:17.5px;font-weight:600;margin-top:6px}
.timeline p{color:var(--body);font-size:15px;margin-top:6px}

/* ---------- Product detail blocks ---------- */
.cat-block{display:grid;grid-template-columns:1fr 1fr;gap:clamp(36px,5vw,80px);align-items:center}
.cat-block+.cat-block{margin-top:clamp(64px,8vw,110px)}
.cat-block.reverse .media{order:2}
.cat-block .media{position:relative;overflow:hidden}
.cat-block .media img{width:100%;aspect-ratio:16/11;object-fit:cover;transition:transform .9s var(--ease)}
.cat-block:hover .media img{transform:scale(1.04)}
.cat-block .tag{
  display:inline-block;font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--accent);font-weight:700;margin-bottom:16px;
}
.cat-block h3{font-size:clamp(24px,2.6vw,34px);font-weight:600;line-height:1.35}
.cat-block>p{color:var(--body);margin-top:18px}
.spec-list{margin-top:26px;display:grid;grid-template-columns:1fr 1fr;gap:14px 28px}
.spec-list li{
  font-size:14.5px;color:var(--ink-2);
  padding-left:20px;position:relative;
}
.spec-list li::before{content:"";position:absolute;left:0;top:11px;width:8px;height:2px;background:var(--accent)}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:clamp(40px,6vw,90px)}
.info-list li{display:flex;gap:22px;padding:26px 0;border-bottom:1px solid var(--line)}
.info-list .ico{
  flex:none;width:48px;height:48px;border:1px solid var(--line);
  display:grid;place-items:center;color:var(--accent);
}
.info-list b{display:block;font-size:16px;font-weight:600}
.info-list p{color:var(--body);font-size:15px;margin-top:4px}
.info-list a:hover{color:var(--accent)}

.form{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.field{display:flex;flex-direction:column;gap:8px}
.field--full{grid-column:1/-1}
.field label{font-size:13px;letter-spacing:.1em;font-weight:600;color:var(--ink-2)}
.field input,.field textarea,.field select{
  font-family:inherit;font-size:15px;color:var(--ink);
  background:var(--paper-2);border:1px solid transparent;
  padding:15px 18px;outline:none;transition:border-color .3s,background .3s;
  border-radius:0;appearance:none;
}
.field textarea{min-height:140px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--accent);background:#fff}
.form .btn{grid-column:1/-1;justify-self:start}
.form-note{grid-column:1/-1;font-size:13px;color:var(--muted)}

.form-toast{
  grid-column:1/-1;display:none;
  background:var(--accent-soft);border-left:3px solid var(--accent);
  padding:14px 18px;font-size:14.5px;color:var(--accent-dark);
}
.form-toast.show{display:block}

.map-frame{margin-top:clamp(48px,6vw,80px);border:1px solid var(--line);background:var(--paper-2)}
.map-frame .bar{display:flex;align-items:center;gap:10px;padding:16px 22px;border-bottom:1px solid var(--line);font-size:14px;color:var(--body)}
.map-frame .bar i{width:8px;height:8px;border-radius:50%;background:var(--accent);flex:none}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:rgba(255,255,255,.72)}
.footer-top{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;
  gap:clamp(32px,4vw,64px);padding:clamp(56px,7vw,88px) 0 56px;
}
.footer-top h4{
  color:#fff;font-size:14px;font-weight:600;letter-spacing:.18em;
  text-transform:uppercase;margin-bottom:24px;
}
.footer-brand .brand{color:#fff}
.footer-brand p{font-size:14.5px;margin-top:22px;max-width:360px}
.footer-col ul{display:grid;gap:12px}
.footer-col a{font-size:14.5px;transition:color .25s}
.footer-col a:hover{color:var(--accent)}
.footer-contact li{display:flex;gap:12px;font-size:14.5px;line-height:1.7}
.footer-contact svg{flex:none;margin-top:5px;color:var(--accent)}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);
  padding:26px 0;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.45);letter-spacing:.04em;
}
.footer-bottom a:hover{color:#fff}

/* ---------- Reveal animations ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal[data-delay="1"]{transition-delay:.12s}
.reveal[data-delay="2"]{transition-delay:.24s}
.reveal[data-delay="3"]{transition-delay:.36s}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .hero-media img{animation:none;transform:none}
}

/* ---------- Case gallery (projects) ---------- */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.gallery .proj-card .thumb{aspect-ratio:4/3}
.gallery .proj-card--wide{grid-column:span 2}
.gallery .proj-card--wide .thumb{aspect-ratio:16/9}
.gallery .proj-card .meta p{
  max-height:0;overflow:hidden;opacity:0;margin-top:0;
  transition:max-height .5s var(--ease),opacity .5s var(--ease),margin .5s var(--ease);
}
.gallery .proj-card:hover .meta p{max-height:90px;opacity:1;margin-top:10px}

/* ---------- Lightbox ---------- */
.lightbox{
  position:fixed;inset:0;z-index:500;display:none;place-items:center;
  background:rgba(10,11,13,.94);padding:48px 56px;
}
.lightbox.open{display:grid}
.lightbox img{max-width:90vw;max-height:82vh;object-fit:contain;box-shadow:0 30px 90px rgba(0,0,0,.55)}
.lightbox .lb-cap{
  position:absolute;bottom:24px;left:50%;transform:translateX(-50%);
  color:rgba(255,255,255,.85);font-size:14px;letter-spacing:.1em;
  white-space:nowrap;
}
.lightbox button{
  position:absolute;background:transparent;color:#fff;cursor:pointer;
  border:1px solid rgba(255,255,255,.4);transition:background .25s,color .25s;
  font-family:inherit;
}
.lightbox button:hover{background:#fff;color:var(--ink)}
.lightbox .lb-close{top:22px;right:26px;width:46px;height:46px;font-size:18px}
.lightbox .lb-nav{top:50%;transform:translateY(-50%);width:50px;height:50px;font-size:22px}
.lightbox .lb-prev{left:22px}
.lightbox .lb-next{right:22px}

/* ---------- Material swatches ---------- */
.swatches{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.swatch span{display:block;width:100%;aspect-ratio:1/1;border:1px solid var(--line)}
.swatch em{
  display:block;text-align:center;font-style:normal;
  font-size:11px;color:var(--muted);margin-top:8px;letter-spacing:.04em;
}

/* ---------- Responsive ---------- */
@media (max-width:1080px){
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .value-grid{grid-template-columns:repeat(2,1fr)}
  .stats .container{grid-template-columns:repeat(2,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
}
@media (max-width:900px){
  .main-nav{display:none}
  .nav-toggle{display:block}
  .split,.cat-block,.contact-grid{grid-template-columns:1fr}
  .cat-block.reverse .media{order:0}
  .card-grid--3{grid-template-columns:repeat(2,1fr)}
  .split-media::after{display:none}
}
@media (max-width:640px){
  .card-grid,.card-grid--3,.form{grid-template-columns:1fr}
  .field{grid-column:1/-1}
  .stats .container{grid-template-columns:1fr 1fr;gap:28px 20px}
  .value-grid{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .hero-inner{padding-bottom:16vh}
  .spec-list{grid-template-columns:1fr}
  .hero-actions .btn{width:100%;justify-content:center}
  .gallery{grid-template-columns:1fr}
  .gallery .proj-card--wide{grid-column:auto}
  .swatches{grid-template-columns:repeat(3,1fr)}
  .lightbox{padding:20px}
  .lightbox .lb-nav{display:none}
  .lightbox .lb-cap{white-space:normal;text-align:center;max-width:80vw}
}