:root{
  --brand:#c8102e;
  --brand-dark:#9e0c24;
  --ink:#1f2329;
  --muted:#6b7280;
  --bg:#ffffff;
  --soft:#f6f7f9;
  --line:#e5e7eb;
  --gold:#b8860b;
  --radius:14px;
  --shadow:0 6px 24px rgba(0,0,0,.08);
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.section{padding:64px 0}
.section.soft{background:var(--soft)}
.section.dark{background:#16181d;color:#fff}
h1,h2,h3{line-height:1.25;font-weight:800}
.eyebrow{color:var(--brand);font-weight:700;letter-spacing:.12em;font-size:13px;text-transform:uppercase;margin-bottom:10px}
.h2{font-size:32px;margin-bottom:8px}
.lead{color:var(--muted);max-width:720px;margin:0 auto 36px;text-align:center;font-size:17px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:30px;font-weight:700;font-size:15px;transition:.2s}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark)}
.btn-ghost{border:1.5px solid #fff;color:#fff}
.btn-ghost:hover{background:#fff;color:var(--ink)}
.btn-line{border:1.5px solid var(--brand);color:var(--brand)}
.btn-line:hover{background:var(--brand);color:#fff}

/* Header / Nav */
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px}
.logo .mark{width:34px;height:34px;border-radius:8px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:18px}
.logo small{display:block;font-size:11px;color:var(--muted);font-weight:600;letter-spacing:.18em}
.menu{display:flex;gap:22px;font-size:15px;font-weight:600}
.menu a:hover{color:var(--brand)}
.menu a.active{color:var(--brand)}
.nav-cta{background:var(--brand);color:#fff;padding:9px 18px;border-radius:24px;font-weight:700;font-size:14px}
.nav-toggle{display:none}

/* Hero */
.hero{position:relative;color:#fff;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:linear-gradient(120deg,#1b1d22 0%,#2a2d34 45%,#c8102e 200%);background-position:center;background-size:cover;background-repeat:no-repeat}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(27,29,34,.82) 0%,rgba(42,45,52,.72) 45%,rgba(0,0,0,.55) 100%)}
.hero .wrap{position:relative;z-index:2;padding:96px 20px 104px}
.hero h1{font-size:46px;max-width:760px;margin-bottom:20px}
.hero p.sub{font-size:18px;max-width:600px;color:#e8eaee;margin-bottom:32px}
.hero-badges{display:flex;gap:12px;flex-wrap:wrap;margin-top:10px}
.badge{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.25);padding:7px 16px;border-radius:30px;font-size:14px;font-weight:600}

/* Stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:8px}
.stat{background:#fff;border-radius:var(--radius);padding:26px 22px;text-align:center;box-shadow:var(--shadow)}
.stat .num{font-size:38px;font-weight:800;color:var(--brand);line-height:1}
.stat .lbl{color:var(--muted);margin-top:8px;font-size:14px}

/* Cards grid */
.grid{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:.2s}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.card .ic{width:48px;height:48px;border-radius:12px;background:rgba(200,16,46,.1);color:var(--brand);display:grid;place-items:center;font-weight:800;font-size:18px;margin-bottom:16px}
.card h3{font-size:19px;margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}
.card .step{color:var(--brand);font-weight:800;font-size:13px;letter-spacing:.1em;margin-bottom:6px}

/* Image placeholder */
.ph{background:linear-gradient(135deg,#e9ebef,#d6dae0);border-radius:var(--radius);display:grid;place-items:center;color:#7a818c;font-size:14px;font-weight:600;text-align:center;min-height:200px;position:relative;overflow:hidden}
.ph::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 30% 20%,rgba(200,16,46,.08),transparent 60%)}
.ph span{position:relative;z-index:2;padding:10px}
.ph.tall{min-height:340px}
.ph.hero-ph{min-height:420px}
.ph img{width:100%;height:auto;max-height:100%;object-fit:contain;position:relative;display:block;margin:0 auto}
.ph.hero-ph img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.logo img{height:44px;width:auto;display:block}


/* Process / timeline */
.process{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;counter-reset:step}
.pstep{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:relative}
.pstep .n{counter-increment:step;width:36px;height:36px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:800;margin-bottom:12px}
.pstep .n::before{content:counter(step,decimal-leading-zero)}

/* Material list */
.matlist{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.matitem{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}
.matitem .k{flex:0 0 96px;font-weight:800;color:var(--brand)}
.matitem .v{color:var(--muted);font-size:14px}

/* FAQ */
.faq{display:grid;gap:14px;max-width:860px;margin:0 auto}
.qa{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 22px}
.qa h3{font-size:17px;color:var(--brand);margin-bottom:8px}
.qa p{color:var(--muted);font-size:15px}

/* AI facts block */
.ai-facts{background:#16181d;color:#fff;border-radius:var(--radius);padding:26px 28px;margin-top:32px}
.ai-facts h4{color:var(--gold);font-size:13px;letter-spacing:.1em;margin-bottom:14px;text-transform:uppercase}
.ai-facts ul{list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:10px 28px}
.ai-facts li{font-size:14px;color:#d7dae0;padding-left:18px;position:relative}
.ai-facts li::before{content:"▸";position:absolute;left:0;color:var(--brand)}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:32px;align-items:start}
.info-row{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}
.info-row .ic{width:42px;height:42px;border-radius:10px;background:rgba(200,16,46,.1);color:var(--brand);display:grid;place-items:center;font-size:18px;flex:0 0 auto}
.info-row .t{font-weight:700}
.info-row .d{color:var(--muted);font-size:14px}

/* Footer */
footer.site{background:#16181d;color:#cfd3da;padding:44px 0 22px;font-size:14px}
.foot-top{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1.15fr);gap:32px;padding-bottom:26px;border-bottom:1px solid #2a2d34}
.foot-brand .foot-logo{display:inline-block;background:#fff;border-radius:10px;padding:8px 12px;line-height:0}
.foot-brand .foot-logo img{height:38px;width:auto;display:block}
.foot-brand .slogan{color:#8b9099;font-size:12px;letter-spacing:.14em;margin-top:12px}
.foot-brand p{color:#8b9099;font-size:13px;margin-top:10px;max-width:340px;line-height:1.75}
.foot-title{color:#fff;font-weight:700;font-size:15px;margin-bottom:16px}
.foot-nav{display:grid;grid-template-columns:1fr 1fr;gap:10px 16px;font-size:14px}
.foot-nav a{transition:.2s}
.foot-nav a:hover{color:#fff}
.foot-contact .line{display:flex;gap:10px;align-items:baseline;margin-bottom:9px;font-size:14px}
.foot-contact .line .k{color:#8b9099;flex:0 0 auto}
.foot-contact .line a{transition:.2s}
.foot-contact .line a:hover{color:#fff}
.foot-contact .addr{color:#8b9099;font-size:13px;line-height:1.75;margin-bottom:16px}
.foot-cta{display:inline-block;background:var(--brand);color:#fff;font-weight:700;font-size:14px;padding:10px 22px;border-radius:26px;transition:.2s}
.foot-cta:hover{background:var(--brand-dark);color:#fff}
.copyright{padding-top:18px;color:#8b9099;font-size:13px;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.copyright a{color:#8b9099;text-decoration:underline}
.copyright a:hover{color:#cfd3da}

/* Responsive */
@media(max-width:880px){
  .menu{display:none}
  .nav-toggle{display:block;background:none;border:0;font-size:26px;cursor:pointer}
  .menu.open{display:flex;position:absolute;top:68px;left:0;right:0;flex-direction:column;background:#fff;padding:16px 20px;gap:14px;border-bottom:1px solid var(--line)}
  .hero h1{font-size:32px}
  .stats,.grid-4,.grid-3,.grid-2,.matlist,.ai-facts ul,.contact-grid,.process{grid-template-columns:1fr}
  .process{grid-template-columns:1fr}
  .h2{font-size:26px}
  .foot-top{grid-template-columns:1fr;gap:26px}
  .foot-brand p{max-width:none}
  .copyright{justify-content:center;text-align:center}
}

/* Product center cards: left config image + right scene image */
.products-list{display:block}
.pcard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin-bottom:24px;transition:.2s}
.pcard:hover{box-shadow:var(--shadow)}
.pcard-head{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.pcard-no{background:var(--brand);color:#fff;font-weight:800;font-size:15px;width:46px;height:46px;border-radius:10px;display:grid;place-items:center;flex:0 0 auto}
.pcard-head h3{font-size:20px;margin:0}
.pcard-tag{display:inline-block;font-size:12px;color:var(--brand);border:1px solid var(--brand);border-radius:20px;padding:2px 10px;margin-top:6px}
.pcard-imgs{display:grid;grid-template-columns:1fr;gap:14px}
.pcard-fig{margin:0;background:var(--soft);border-radius:12px;overflow:hidden;border:1px solid var(--line);text-align:center}
.pcard-fig img{width:100%;height:auto;max-height:640px;object-fit:contain;display:block;background:#eef0f3}
.pcard-fig figcaption{font-size:13px;color:var(--muted);text-align:center;padding:9px;font-weight:600;background:#fff;border-top:1px solid var(--line)}
.pcard-desc{color:var(--muted);font-size:15px;margin-top:16px}
@media(max-width:880px){
  .pcard-imgs{grid-template-columns:1fr}
  .pcard-fig img{max-height:520px}
}