:root{
  --navy:#0b1730;
  --navy-2:#111e3d;
  --gold:#c8952f;
  --gold-light:#e8b95a;
  --ink:#16213c;
  --muted:#5b6478;
  --bg:#f7f8fb;
  --card:#ffffff;
  --border:#e6e8f0;
  --radius:16px;
  --shadow:0 10px 30px rgba(15,25,55,.08);
  --maxw:1180px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Segoe UI",-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

/* language visibility */
[data-zh]{ }
html[data-lang="en"] [data-zh-only]{display:none;}
html[data-lang="zh"] [data-en-only]{display:none;}

/* progress bar */
.progress-bar{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,var(--gold),var(--gold-light));width:0%;z-index:9999;transition:width .1s ease-out;}

/* header */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:rgba(11,23,48,.0);
  backdrop-filter:blur(0px);
  transition:background .35s ease, box-shadow .35s ease, backdrop-filter .35s ease;
  padding:18px 0;
}
.site-header.scrolled{
  background:rgba(11,23,48,.92);
  backdrop-filter:blur(10px);
  box-shadow:0 6px 24px rgba(0,0,0,.15);
  padding:10px 0;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;}
.logo{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:18px;letter-spacing:.2px;}
.logo-mark{width:36px;height:36px;flex-shrink:0;filter:drop-shadow(0 2px 6px rgba(200,149,47,.4));}
.logo-text small{display:block;font-weight:400;font-size:11px;color:#c7cee0;letter-spacing:.5px;}

.main-nav{display:flex;gap:28px;}
.main-nav a{color:#e7ebf6;font-size:14.5px;font-weight:500;position:relative;padding:4px 0;}
.main-nav a::after{content:"";position:absolute;left:0;bottom:-2px;height:2px;width:0;background:var(--gold-light);transition:width .25s ease;}
.main-nav a:hover::after{width:100%;}

.header-actions{display:flex;align-items:center;gap:16px;}
.lang-toggle{
  display:flex;align-items:center;gap:6px;background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.18);border-radius:20px;padding:6px 12px;cursor:pointer;color:#fff;font-size:13px;
}
.lang-opt{opacity:.55;transition:opacity .2s;}
.lang-opt.active{opacity:1;font-weight:700;color:var(--gold-light);}
.lang-sep{opacity:.4;}
.nav-burger{display:none;flex-direction:column;gap:4px;background:none;border:none;cursor:pointer;padding:6px;}
.nav-burger span{width:22px;height:2px;background:#fff;border-radius:2px;}

/* hero */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  background-size:cover;background-position:center;
  color:#fff;
}
.hero-inner{max-width:760px;padding-top:80px;}
.eyebrow{
  display:inline-block;color:var(--gold-light);font-weight:600;letter-spacing:1px;font-size:13px;
  text-transform:uppercase;margin-bottom:18px;
}
.hero h1{font-size:clamp(32px,5.2vw,58px);line-height:1.12;margin:0 0 20px;font-weight:800;}
.hero-sub{font-size:17px;color:#dbe1f0;max-width:600px;margin:0 0 34px;}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;}

.btn{display:inline-block;padding:14px 26px;border-radius:30px;font-weight:600;font-size:14.5px;transition:transform .25s ease, box-shadow .25s ease, background .25s ease;}
.btn-primary{background:linear-gradient(135deg,var(--gold-light),var(--gold));color:var(--navy);box-shadow:0 8px 20px rgba(200,149,47,.35);}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 12px 26px rgba(200,149,47,.45);}
.btn-ghost{border:1.5px solid rgba(255,255,255,.5);color:#fff;}
.btn-ghost:hover{background:rgba(255,255,255,.12);transform:translateY(-3px);}
.btn-block{display:block;text-align:center;margin-top:22px;}

.hero-scroll-hint{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);}
.hero-scroll-hint span{
  display:block;width:22px;height:36px;border:2px solid rgba(255,255,255,.6);border-radius:14px;position:relative;
}
.hero-scroll-hint span::after{
  content:"";position:absolute;top:6px;left:50%;transform:translateX(-50%);
  width:4px;height:8px;background:var(--gold-light);border-radius:2px;
  animation:scrollDot 1.6s ease-in-out infinite;
}
@keyframes scrollDot{0%{opacity:1;top:6px;}70%{opacity:0;top:18px;}100%{opacity:0;top:6px;}}

/* strip */
.strip{background:var(--navy-2);color:#fff;padding:34px 0;}
.strip-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center;}
.strip-item strong{display:block;font-size:28px;color:var(--gold-light);font-weight:800;}
.strip-item span{font-size:13px;color:#c3cadf;}

/* section commons */
section{padding:96px 0;}
.section-label{color:var(--gold);font-weight:700;letter-spacing:1.5px;text-transform:uppercase;font-size:12.5px;margin:0 0 10px;}
.section-sub{color:var(--muted);margin-top:-8px;}
.center{text-align:center;margin-left:auto;margin-right:auto;}
h2{font-size:clamp(26px,3.4vw,38px);margin:0 0 14px;font-weight:800;}

/* about */
.about{background:var(--card);}
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center;}
.about-copy p{color:var(--muted);font-size:15.5px;}
.about-visual{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);}
.about-visual img{transition:transform .6s ease;}
.about-visual:hover img{transform:scale(1.05);}

/* products */
.products{background:var(--bg);}
.product-grid{
  margin-top:50px;display:grid;grid-template-columns:repeat(3,1fr);gap:28px;
}
.product-card{
  background:var(--card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);
  box-shadow:var(--shadow);transition:transform .35s ease, box-shadow .35s ease;
}
.product-card:hover{transform:translateY(-8px);box-shadow:0 20px 40px rgba(15,25,55,.14);}
.product-media{height:200px;overflow:hidden;background:#eef1f8;}
.product-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.product-card:hover .product-media img{transform:scale(1.08);}
.product-media-icon{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#101c3a,#1c2c56);}
.cat-icon{width:64px;height:64px;fill:var(--gold-light);}
.product-body{padding:22px 24px 26px;}
.product-body h3{margin:0 0 8px;font-size:18px;}
.product-body p{margin:0;color:var(--muted);font-size:14px;}

.product-card-link{display:block;}
.product-view{
  display:flex;align-items:center;gap:6px;color:var(--gold);font-weight:700;font-size:13px;
  margin-top:14px;transition:gap .25s ease;
}
.product-card-link:hover .product-view{gap:11px;}

/* category / product page */
.page-hero{
  position:relative;min-height:46vh;display:flex;align-items:flex-end;
  background-size:cover;background-position:center;color:#fff;padding-bottom:56px;
}
.breadcrumb{
  display:flex;align-items:center;gap:8px;font-size:13px;color:#cfd6e8;margin-bottom:14px;
}
.breadcrumb a{color:#cfd6e8;transition:color .2s ease;}
.breadcrumb a:hover{color:var(--gold-light);}
.breadcrumb span{opacity:.5;}
.page-hero h1{font-size:clamp(28px,4.4vw,44px);margin:0 0 12px;font-weight:800;}
.page-hero-sub{color:#dbe1f0;max-width:640px;font-size:15.5px;margin:0;}

.category-intro{background:var(--card);padding:70px 0 20px;}
.category-intro p{color:var(--muted);max-width:760px;font-size:15.5px;}

.item-grid{
  margin-top:10px;display:grid;grid-template-columns:repeat(4,1fr);gap:26px;
}
.item-card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow);
  transition:transform .35s ease, box-shadow .35s ease;
}
.item-card:hover{transform:translateY(-8px);box-shadow:0 20px 40px rgba(15,25,55,.14);}
.item-media{
  height:150px;overflow:hidden;background:linear-gradient(135deg,#101c3a,#1c2c56);
  display:flex;align-items:center;justify-content:center;
}
.item-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.item-card:hover .item-media img{transform:scale(1.08);}
.item-media svg{width:40px;height:40px;stroke:var(--gold-light);fill:none;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;}
.item-body{padding:20px 20px 24px;}
.item-card h3{margin:0 0 8px;font-size:15.5px;}
.item-card p{margin:0;color:var(--muted);font-size:13px;}

.other-categories{background:var(--navy-2);color:#fff;}
.other-categories h2{color:#fff;}
.chip-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px;}
.chip{
  padding:10px 20px;border-radius:24px;border:1px solid rgba(255,255,255,.2);color:#e7ebf6;
  font-size:13.5px;font-weight:600;transition:background .25s ease, border-color .25s ease, transform .25s ease;
}
.chip:hover{background:rgba(232,185,90,.15);border-color:var(--gold-light);transform:translateY(-2px);}
.chip.is-current{background:linear-gradient(135deg,var(--gold-light),var(--gold));color:var(--navy);border-color:transparent;}

/* why */
.why{background:var(--navy);color:#fff;}
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;}
.why-num{font-size:34px;font-weight:800;color:rgba(255,255,255,.15);margin-bottom:6px;}
.why-item h3{margin:0 0 8px;font-size:17px;}
.why-item p{margin:0;color:#b9c1d8;font-size:14px;}

/* contact */
.contact{background:var(--card);}
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:start;}
.contact-copy p{color:var(--muted);}
.contact-list{list-style:none;padding:0;margin:30px 0 0;display:flex;flex-direction:column;gap:20px;}
.contact-list li{display:flex;gap:14px;align-items:flex-start;}
.contact-ic{font-size:20px;}
.contact-list strong{display:block;font-size:12.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:2px;}
.contact-list a{color:var(--navy);font-weight:600;}
.contact-list a:hover{color:var(--gold);}

.contact-card{
  background:linear-gradient(160deg,#101c3a,#1a2c58);color:#fff;border-radius:var(--radius);
  padding:34px;box-shadow:var(--shadow);
}
.contact-card h3{margin:0 0 18px;font-size:18px;}
.contact-card dl{margin:0;display:grid;grid-template-columns:auto;row-gap:4px;}
.contact-card dt{font-size:12px;color:#9fabce;text-transform:uppercase;letter-spacing:.5px;margin-top:14px;}
.contact-card dd{margin:0;font-size:14.5px;font-weight:600;}

/* footer */
.site-footer{background:var(--navy-2);color:#a9b2ca;padding:26px 0;font-size:13px;}
.footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;}

/* back to top */
.back-to-top{
  position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:50%;
  background:linear-gradient(135deg,var(--gold-light),var(--gold));color:var(--navy);
  display:flex;align-items:center;justify-content:center;font-weight:800;box-shadow:0 8px 20px rgba(200,149,47,.4);
  opacity:0;pointer-events:none;transform:translateY(10px);transition:opacity .3s ease, transform .3s ease;z-index:900;
}
.back-to-top.show{opacity:1;pointer-events:auto;transform:translateY(0);}

/* reveal on scroll */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease, transform .7s ease;}
.reveal.in-view{opacity:1;transform:translateY(0);}
.delay-1{transition-delay:.1s;}
.delay-2{transition-delay:.2s;}
.delay-3{transition-delay:.3s;}

/* responsive */
@media (max-width:960px){
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:36px;}
  .product-grid{grid-template-columns:repeat(2,1fr);}
  .why-grid{grid-template-columns:repeat(2,1fr);}
  .strip-inner{grid-template-columns:repeat(2,1fr);}
}
@media (max-width:760px){
  .main-nav{
    position:fixed;top:0;right:0;height:100vh;width:240px;background:var(--navy);
    flex-direction:column;padding:100px 30px;gap:26px;transform:translateX(100%);transition:transform .35s ease;
  }
  .main-nav.open{transform:translateX(0);}
  .nav-burger{display:flex;}
  .product-grid{grid-template-columns:1fr;}
  .item-grid{grid-template-columns:1fr 1fr;}
  .why-grid{grid-template-columns:1fr;}
  .strip-inner{grid-template-columns:1fr;}
  section{padding:70px 0;}
}
@media (max-width:520px){
  .item-grid{grid-template-columns:1fr;}
}