/* ===== Zhonghuai Group — v2 ===== */
:root{
  --bg:#f8f6f2;
  --surface:#ffffff;
  --ink:#1c1b1a;
  --ink-2:#4d4a46;
  --muted:#8a857e;
  --line:#e6e1d9;
  --accent:#1f2a44;      /* deep navy */
  --accent-2:#b8552f;    /* terracotta, used sparingly */
  --tint:#f1ede6;
  --radius:14px;
  --radius-s:8px;
  --shadow:0 1px 2px rgba(28,27,26,.04),0 8px 24px -12px rgba(28,27,26,.18);
  --sans:"Inter",-apple-system,"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --serif:"Cormorant Garamond","Songti SC","Noto Serif CJK SC",Georgia,serif;
  --max:1240px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;padding:0}
h1,h2,h3{margin:0;font-weight:600;line-height:1.15;letter-spacing:-.01em}
h1{font-family:var(--serif);font-size:clamp(2.2rem,4.6vw,3.6rem);font-weight:500}
h2{font-family:var(--serif);font-size:clamp(1.8rem,3vw,2.5rem);font-weight:500}
h3{font-size:1.05rem}
html[lang="zh-CN"] h1,html[lang="zh-CN"] h2{font-family:var(--sans);font-weight:600;letter-spacing:0}
html[lang="zh-CN"] h1{font-size:clamp(1.9rem,3.8vw,2.9rem)}
html[lang="zh-CN"] h2{font-size:clamp(1.5rem,2.6vw,2.1rem)}
p{margin:0 0 1em}
.container{width:min(var(--max),100% - 48px);margin-inline:auto}
.container.narrow{max-width:760px}
.eyebrow{font-size:.75rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 .9rem;font-weight:500}
.eyebrow.light{color:rgba(255,255,255,.6)}
.muted{color:var(--ink-2)}
.lead{font-size:1.1rem;color:var(--ink-2);max-width:56ch}
.text-link{font-weight:500;border-bottom:1px solid transparent;transition:border-color .2s}
.text-link:hover{border-color:currentColor}

/* buttons */
.button{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.85rem 1.5rem;border-radius:999px;font-weight:500;font-size:.95rem;border:1px solid transparent;transition:transform .15s,background .2s,color .2s,border-color .2s;white-space:nowrap}
.button:active{transform:translateY(1px)}
.button.primary{background:var(--accent);color:#fff}
.button.primary:hover{background:#2b3a5e}
.button.ghost{border-color:var(--ink);color:var(--ink)}
.button.ghost:hover{background:var(--ink);color:#fff}
.button.light{background:#fff;color:var(--accent)}
.button.light:hover{background:var(--tint)}
.button.small{padding:.55rem 1.1rem;font-size:.875rem}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(248,246,242,.85);backdrop-filter:saturate(1.4) blur(12px);-webkit-backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid transparent;transition:border-color .2s}
.site-header.scrolled{border-color:var(--line)}
.header-inner{display:flex;align-items:center;gap:2rem;height:72px}
.brand{display:flex;align-items:center;gap:.75rem}
.brand-mark{width:40px;height:40px;border-radius:10px;object-fit:cover}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text strong{font-size:1.05rem;letter-spacing:.01em}
.brand-text small{font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.nav{display:flex;gap:2rem;margin-left:auto}
.nav a{font-size:.95rem;font-weight:500;color:var(--ink-2);padding:.3rem 0;border-bottom:1.5px solid transparent;transition:color .2s,border-color .2s}
.nav a:hover,.nav a.active{color:var(--ink);border-color:var(--ink)}
.header-actions{display:flex;align-items:center;gap:1rem}
.lang-toggle{display:inline-flex;gap:.35rem;font-size:.8rem;letter-spacing:.06em;color:var(--muted);padding:.4rem .6rem;border:1px solid var(--line);border-radius:999px}
.lang-toggle i{font-style:normal;opacity:.4}
.lang-toggle span.on{color:var(--ink);font-weight:600}
.menu-toggle{display:none;width:40px;height:40px;flex-direction:column;justify-content:center;gap:6px;align-items:center}
.menu-toggle span{display:block;width:22px;height:1.5px;background:var(--ink);transition:transform .2s}
.menu-toggle.open span:first-child{transform:translateY(3.75px) rotate(45deg)}
.menu-toggle.open span:last-child{transform:translateY(-3.75px) rotate(-45deg)}

/* hero */
.hero{padding:3.5rem 0 2rem}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:4rem;align-items:center}
.hero-copy h1{margin-bottom:1.25rem;max-width:18ch}
html[lang="zh-CN"] .hero-copy h1{max-width:22ch}
.hero-actions{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:1.75rem}
.hero-media{margin:0;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3.4;background:var(--tint)}
.hero-media img{width:100%;height:100%;object-fit:cover}
.stats{list-style:none;margin:3rem 0 0;padding:1.75rem 0 0;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);gap:2rem}
.stats li{display:flex;flex-direction:column;gap:.2rem}
.stats strong{font-family:var(--serif);font-size:2.2rem;font-weight:500;line-height:1}
.stats span{font-size:.85rem;color:var(--muted)}
.stats.inline{grid-template-columns:repeat(3,1fr);margin:2rem 0 3rem}

/* sections */
.section{padding:4.5rem 0}
.section-tint{background:var(--tint)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:2rem;margin-bottom:2rem}
.section-head .eyebrow{margin-bottom:.5rem}
.page-head{padding:3rem 0 1.5rem}
.page-head h1{margin-bottom:.5rem}
.page-head.narrow{max-width:760px}

/* series grid (home) */
.series-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.series-card{position:relative;aspect-ratio:4/3;border-radius:var(--radius);overflow:hidden;background:var(--tint);display:block}
.series-card img{width:100%;height:100%;object-fit:cover;transition:transform .6s cubic-bezier(.2,.7,.2,1)}
.series-card:hover img{transform:scale(1.05)}
.series-card .cap{position:absolute;inset:auto 0 0 0;padding:2.5rem 1.1rem 1rem;background:linear-gradient(to top,rgba(20,18,16,.72),rgba(20,18,16,0));color:#fff;display:flex;justify-content:space-between;align-items:end;gap:.5rem}
.series-card .cap strong{font-size:1rem;font-weight:600}
.series-card .cap small{font-size:.75rem;opacity:.75}
.series-card.featured .cap strong::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent-2);margin-right:.5rem;vertical-align:middle}

.series-card.featured{grid-column:span 2;grid-row:span 2;aspect-ratio:auto}
.series-card.featured .cap strong{font-size:1.3rem}
.lang-toggle{white-space:nowrap}

/* product cards */
.product-grid{display:grid;gap:1.5rem 1.25rem}
.cols-4{grid-template-columns:repeat(4,1fr)}
.cols-3{grid-template-columns:repeat(3,1fr)}
.product-card{display:block;cursor:pointer}
.product-card .thumb{aspect-ratio:4/5;border-radius:var(--radius-s);overflow:hidden;background:var(--tint);position:relative}
.product-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .6s cubic-bezier(.2,.7,.2,1)}
.product-card:hover .thumb img{transform:scale(1.04)}
.product-card .tag{position:absolute;top:.6rem;left:.6rem;font-size:.65rem;letter-spacing:.1em;text-transform:uppercase;background:#fff;color:var(--ink);padding:.25rem .55rem;border-radius:999px;font-weight:600}
.product-card .body{padding:.8rem .1rem 0}
.product-card h3{font-size:.98rem;font-weight:600;margin-bottom:.2rem}
.product-card .sub{font-size:.8rem;color:var(--muted);margin:0 0 .35rem}
.product-card .spec{font-size:.82rem;color:var(--ink-2);margin:0;display:flex;gap:.6rem;flex-wrap:wrap}
.product-card .spec b{font-weight:500;color:var(--ink)}

/* capabilities */
.cap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem}
.cap{padding:1.75rem;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.cap span{font-family:var(--serif);font-size:1.4rem;color:var(--muted);display:block;margin-bottom:1.25rem}
.cap h3{margin-bottom:.6rem}
.cap p{margin:0;color:var(--ink-2);font-size:.95rem}

/* about band */
.about-grid{display:grid;grid-template-columns:1fr 1.4fr;gap:4rem}
.about-text p{color:var(--ink-2);font-size:1.02rem}
.prose p{font-size:1.05rem;color:var(--ink-2)}
.prose h2{margin:2.5rem 0 1rem}
.service-list{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:3rem}
.service-list div{padding:1.25rem;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-s);display:flex;flex-direction:column;gap:.25rem}
.service-list span{font-size:.9rem;color:var(--ink-2)}

/* contact band */
.contact-band{background:var(--accent);color:#fff;padding:4rem 0}
.contact-band-inner{display:flex;justify-content:space-between;align-items:center;gap:3rem}
.contact-band h2{color:#fff;margin-bottom:.6rem}
.contact-band p{color:rgba(255,255,255,.75);margin:0;max-width:48ch}
.band-actions{display:flex;flex-direction:column;align-items:flex-end;gap:.75rem}
.band-mail{color:rgba(255,255,255,.75);font-size:.9rem;border-bottom:1px solid rgba(255,255,255,.3)}

/* catalog */
.catalog-layout{display:grid;grid-template-columns:240px 1fr;gap:3rem;padding-bottom:5rem;align-items:start}
.catalog-side{position:sticky;top:92px}
.series-nav{display:flex;flex-direction:column;gap:.1rem}
.series-nav a{display:flex;justify-content:space-between;align-items:center;padding:.55rem .75rem;border-radius:var(--radius-s);color:var(--ink-2);font-size:.92rem;transition:background .15s,color .15s}
.series-nav a:hover{background:var(--tint);color:var(--ink)}
.series-nav a.active{background:var(--ink);color:#fff}
.series-nav a span{font-size:.72rem;opacity:.55}
.series-nav a.child{padding-left:1.75rem;font-size:.86rem}
.series-nav .group{margin-top:.75rem;padding-top:.75rem;border-top:1px solid var(--line)}
.empty{color:var(--muted);padding:3rem 0}

/* detail */
.crumbs{font-size:.82rem;color:var(--muted);padding:1.75rem 0 1.5rem;display:flex;gap:.5rem;flex-wrap:wrap}
.crumbs a:hover{color:var(--ink)}
.detail{display:grid;grid-template-columns:1.15fr .85fr;gap:3.5rem;align-items:start;padding-bottom:4rem}
.gallery{display:grid;grid-template-columns:72px 1fr;gap:.75rem}
.gallery-thumbs{display:flex;flex-direction:column;gap:.5rem;max-height:620px;overflow:auto}
.gallery-thumbs button{aspect-ratio:1;border-radius:6px;overflow:hidden;border:1.5px solid transparent;opacity:.7;transition:opacity .15s,border-color .15s;flex:none}
.gallery-thumbs button.active,.gallery-thumbs button:hover{opacity:1;border-color:var(--ink)}
.gallery-thumbs img{width:100%;height:100%;object-fit:cover}
.gallery-main{aspect-ratio:4/4.6;border-radius:var(--radius);overflow:hidden;background:var(--tint);cursor:zoom-in}
.gallery-main img{width:100%;height:100%;object-fit:cover}
.detail-info{position:sticky;top:100px}
.detail-info .eyebrow{margin-bottom:.5rem}
.detail-info h1{font-size:clamp(1.7rem,2.6vw,2.3rem);margin-bottom:.25rem}
.detail-info .alt-name{color:var(--muted);margin-bottom:1.5rem}
.spec-table{width:100%;border-collapse:collapse;margin:0 0 1.5rem;font-size:.95rem}
.spec-table th,.spec-table td{text-align:left;padding:.8rem 0;border-top:1px solid var(--line);vertical-align:top}
.spec-table th{width:34%;font-weight:500;color:var(--muted);padding-right:1rem}
.spec-table tr:last-child td,.spec-table tr:last-child th{border-bottom:1px solid var(--line)}
.colorcards{margin:1.25rem 0 1.75rem}
.colorcards .label{font-size:.75rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:.6rem;font-weight:500}
.colorcards .strip{display:grid;grid-template-columns:repeat(5,1fr);gap:.5rem}
.colorcards button{aspect-ratio:1;border-radius:6px;overflow:hidden;border:1px solid var(--line);cursor:zoom-in}
.colorcards img{width:100%;height:100%;object-fit:cover;background:#fff}
.detail-actions{display:flex;gap:.75rem;flex-wrap:wrap}
.related{padding-bottom:5rem}
.related h2{font-size:1.4rem;margin-bottom:1.25rem}

/* contact page */
.contact-layout{display:grid;grid-template-columns:1fr 280px;gap:4rem;padding-bottom:5rem;align-items:start}
.contact-list{margin:0 0 2.5rem;display:grid;gap:0}
.contact-list div{display:grid;grid-template-columns:200px 1fr;padding:1rem 0;border-top:1px solid var(--line)}
.contact-list div:last-child{border-bottom:1px solid var(--line)}
.contact-list dt{color:var(--muted);font-size:.9rem}
.contact-list dd{margin:0;font-size:1.05rem;font-weight:500}
.address-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem}
.address{padding:1.5rem;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.address strong{display:block;margin-bottom:.4rem}
.address p{color:var(--ink-2);font-size:.95rem}
.wechat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;text-align:center}
.wechat img{width:100%;border-radius:var(--radius-s);margin-bottom:1rem}
.wechat p{margin:0;color:var(--muted);font-size:.9rem}
.interest{display:inline-block;background:var(--tint);border:1px solid var(--line);border-radius:999px;padding:.4rem .9rem;font-size:.9rem;margin-top:.5rem}

/* lightbox */
.lightbox{position:fixed;inset:0;z-index:100;background:rgba(20,18,16,.92);display:flex;align-items:center;justify-content:center;padding:3rem}
.lightbox[hidden]{display:none}
.lightbox img{max-width:100%;max-height:100%;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lightbox-close{position:absolute;top:1rem;right:1.25rem;color:#fff;font-size:2.4rem;line-height:1;opacity:.7}
.lightbox-close:hover{opacity:1}

/* footer */
.footer{border-top:1px solid var(--line);padding:2.5rem 0;font-size:.85rem;color:var(--muted)}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:2rem;flex-wrap:wrap}
.footer-brand{display:flex;flex-direction:column;gap:.2rem}
.footer-brand strong{color:var(--ink)}
.footer-nav{display:flex;gap:1.5rem}
.footer-nav a:hover{color:var(--ink)}

/* views */
.view[hidden]{display:none}
.fade-in{animation:fade .35s ease both}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ===== responsive ===== */
@media (max-width:1024px){
  .series-grid{grid-template-columns:repeat(3,1fr)}
  .cols-4{grid-template-columns:repeat(3,1fr)}
  .hero-grid{gap:2.5rem}
  .cap-grid{grid-template-columns:1fr}
  .series-card.featured{grid-column:span 3;grid-row:auto;aspect-ratio:21/9}
  .about-grid{grid-template-columns:1fr;gap:1.5rem}
  .detail{grid-template-columns:1fr;gap:2rem}
  .detail-info{position:static}
  .catalog-layout{grid-template-columns:1fr;gap:1.5rem}
  .catalog-side{position:static}
  .series-nav{flex-direction:row;overflow-x:auto;gap:.4rem;padding-bottom:.5rem;scrollbar-width:none}
  .series-nav::-webkit-scrollbar{display:none}
  .series-nav a{white-space:nowrap;border:1px solid var(--line);background:var(--surface);gap:.5rem}
  .series-nav a.child{padding-left:.75rem}
  .series-nav .group{margin:0;padding:0;border:0;display:contents}
  .contact-layout{grid-template-columns:1fr}
  .wechat{max-width:280px}
}
@media (max-width:760px){
  .container{width:min(var(--max),100% - 32px)}
  .header-inner{height:64px;gap:1rem}
  .nav{position:fixed;inset:64px 0 auto 0;background:var(--bg);flex-direction:column;gap:0;padding:.5rem 16px 1rem;border-bottom:1px solid var(--line);display:none}
  .nav.open{display:flex}
  .nav a{padding:.9rem 0;border-bottom:1px solid var(--line);font-size:1.05rem}
  .header-cta{display:none}
  .menu-toggle{display:flex}
  .hero{padding:2rem 0 1.5rem}
  .hero-grid{grid-template-columns:1fr;gap:1.75rem}
  .hero-media{order:-1;aspect-ratio:16/10}
  .stats{grid-template-columns:1fr 1fr;gap:1.25rem;margin-top:2rem}
  .stats strong{font-size:1.8rem}
  .section{padding:3rem 0}
  .section-head{flex-direction:column;align-items:flex-start;gap:.5rem}
  .series-grid{grid-template-columns:1fr 1fr;gap:.6rem}
  .series-card{aspect-ratio:1}
  .series-card.featured{grid-column:span 2;aspect-ratio:16/9}
  .brand-text small{display:none}
  .series-card .cap{padding:2rem .8rem .7rem}
  .series-card .cap small{display:none}
  .cols-4,.cols-3{grid-template-columns:1fr 1fr;gap:1.25rem .75rem}
  .product-card h3{font-size:.9rem}
  .product-card .spec{font-size:.78rem}
  .gallery{grid-template-columns:1fr}
  .gallery-thumbs{flex-direction:row;order:2;max-height:none}
  .gallery-thumbs button{width:56px}
  .gallery-main{aspect-ratio:1}
  .contact-band-inner{flex-direction:column;align-items:flex-start}
  .band-actions{align-items:flex-start}
  .contact-list div{grid-template-columns:1fr;gap:.2rem}
  .address-grid{grid-template-columns:1fr}
  .service-list{grid-template-columns:1fr}
  .footer-inner{flex-direction:column;align-items:flex-start}
  .lightbox{padding:1rem}
}