:root{
  --background:0 0% 100%; --foreground:240 10% 3.9%;
  --card:0 0% 100%; --muted:240 4.8% 95.9%; --muted-foreground:240 3.8% 46.1%;
  --accent:240 4.8% 95.9%; --primary:240 5.9% 10%; --primary-foreground:0 0% 98%;
  --border:240 5.9% 90%; --input:240 5.9% 90%; --ring:240 10% 3.9%; --radius:.5rem;
}
*,*::before,*::after{box-sizing:border-box;border-color:hsl(var(--border));}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;background:hsl(var(--background));color:hsl(var(--foreground));
  font-family:"Inter","Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;overflow-x:clip;line-height:1.5;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;margin:0;padding:0;}
h1,h2,h3,h4{letter-spacing:-.02em;text-wrap:balance;margin:0;font-weight:600;}
:lang(zh-CN) h1,:lang(zh-CN) h2,:lang(zh-CN) h3{letter-spacing:0;}
p{margin:0;}
.ico{width:1rem;height:1rem;flex-shrink:0;}
.ico-sm{width:1rem;height:1rem;flex-shrink:0;}
.muted{color:hsl(var(--muted-foreground));}
.container-page{margin:0 auto;width:100%;max-width:72rem;padding:0 1.5rem;}

/* ---------- header ---------- */
.site-header{position:fixed;inset:0 0 auto 0;z-index:50;background:hsl(var(--background));transition:border-color .3s;border-bottom:1px solid transparent;}
.site-header.scrolled{background:hsl(var(--background)/.9);backdrop-filter:blur(12px);border-bottom-color:hsl(var(--border));}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:6rem;}
.logo img{height:4rem;width:auto;object-fit:contain;object-position:left;}
.nav-desktop{display:none;align-items:center;gap:2rem;}
.nav-desktop a{font-size:.875rem;color:hsl(var(--muted-foreground));transition:color .2s;}
.nav-desktop a:hover,.nav-desktop a[aria-current="page"]{color:hsl(var(--foreground));}
.nav-desktop a[aria-current="page"]{font-weight:500;}
.header-actions{display:flex;align-items:center;gap:.75rem;}
.lang-toggle{font-size:.875rem;font-weight:500;color:hsl(var(--muted-foreground));transition:color .2s;}
.lang-toggle:hover{color:hsl(var(--foreground));}
.menu-btn{display:grid;place-items:center;width:2.25rem;height:2.25rem;margin-right:-.5rem;background:none;border:0;padding:0;color:inherit;cursor:pointer;}
.menu-btn .ico{width:1.25rem;height:1.25rem;}
.nav-mobile{display:none;border-top:1px solid hsl(var(--border));background:hsl(var(--background));}
.nav-mobile.open{display:block;}
.nav-mobile .container-page{display:flex;flex-direction:column;gap:1.25rem;padding-top:1.5rem;padding-bottom:1.5rem;}
.nav-mobile a{font-size:1rem;font-weight:500;}
main{padding-top:6rem;}

/* ---------- type ---------- */
.eyebrow{font-size:.875rem;font-weight:500;color:hsl(var(--muted-foreground));}
.h-hero{font-size:2.25rem;line-height:1.08;}
.h-sec{font-size:1.875rem;line-height:1.15;}
.h-page{font-size:2.25rem;line-height:1.1;}
.lead{font-size:1.125rem;color:hsl(var(--muted-foreground));line-height:1.7;}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;height:2.75rem;padding:0 1.5rem;border-radius:var(--radius);font-size:.875rem;font-weight:500;transition:opacity .2s,background-color .2s;cursor:pointer;}
.btn:active{transform:scale(.98);}
.btn-primary{background:hsl(var(--primary));color:hsl(var(--primary-foreground));border:1px solid hsl(var(--primary));}
.btn-primary:hover{opacity:.9;}
.btn-outline{border:1px solid hsl(var(--border));background:transparent;}
.btn-outline:hover{background:hsl(var(--accent));}
.btn-ghost{display:inline-flex;align-items:center;gap:.5rem;font-size:.875rem;font-weight:500;transition:gap .2s;}
.btn-ghost:hover{gap:.75rem;}
.btn-disabled{display:inline-flex;align-items:center;height:2.75rem;padding:0 1.5rem;border-radius:var(--radius);border:1px dashed hsl(var(--border));font-size:.875rem;color:hsl(var(--muted-foreground));}

/* ---------- sections ---------- */
.section{padding:5rem 0;}
.section-lg{padding:6rem 0;}
.bb{border-bottom:1px solid hsl(var(--border));}
.sec-head{max-width:42rem;margin-bottom:3.5rem;}
.sec-head .eyebrow{margin-bottom:1rem;}
.sec-head h2{margin-bottom:1.25rem;}
.page-hero{padding:4rem 0 4rem;}
.page-hero .inner{max-width:48rem;}
.page-hero .eyebrow{margin-bottom:1.25rem;}
.page-hero h1{margin-bottom:1.5rem;}
.page-hero .lead{max-width:42rem;}

/* ---------- grids ---------- */
.grid{display:grid;}
.g-2{gap:3rem;}
.hero-grid{gap:3rem;align-items:center;}
.svc-grid{gap:1px;background:hsl(var(--border));border:1px solid hsl(var(--border));border-radius:var(--radius);overflow:hidden;}
.svc-cell{background:hsl(var(--card));padding:2rem;}
.svc-cell h3{font-size:1.25rem;margin-bottom:.75rem;}
.svc-cell .desc{font-size:.875rem;color:hsl(var(--muted-foreground));line-height:1.7;margin-bottom:1.25rem;}
.dots li{display:flex;gap:.5rem;font-size:.875rem;color:hsl(var(--muted-foreground));margin-bottom:.5rem;}
.dot{margin-top:.55rem;width:.25rem;height:.25rem;border-radius:9999px;background:hsl(var(--muted-foreground)/.6);flex-shrink:0;}
.dots-bordered li{display:flex;gap:.5rem;font-size:.875rem;border-top:1px solid hsl(var(--border));padding-top:.75rem;margin-bottom:1rem;}
.prod-grid{gap:2rem;}
.prod-card{border:1px solid hsl(var(--border));border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;}
.prod-card img{width:100%;height:13rem;object-fit:cover;}
.prod-body{padding:1.75rem;display:flex;flex-direction:column;flex:1;}
.prod-body h3{font-size:1.25rem;margin-bottom:.75rem;}
.tagrow{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem;}
.pill{font-size:.75rem;font-weight:500;padding:.25rem .625rem;border-radius:9999px;border:1px solid hsl(var(--border));color:hsl(var(--muted-foreground));}
.tagtxt{font-size:.75rem;color:hsl(var(--muted-foreground));}
.img-lg{width:100%;height:20rem;object-fit:cover;border-radius:var(--radius);}
.img-md{width:100%;height:16rem;object-fit:cover;border-radius:var(--radius);}
.img-sm{width:100%;height:12.5rem;object-fit:cover;border-radius:var(--radius);}
.metric-grid{gap:1.5rem;margin-top:3rem;grid-template-columns:repeat(2,1fr);}
.metric{border-top:1px solid hsl(var(--border));padding-top:1rem;}
.metric .v{font-size:1.75rem;font-weight:600;letter-spacing:-.02em;}
.metric .l{font-size:.8125rem;color:hsl(var(--muted-foreground));margin-top:.25rem;}
.value-grid{gap:1.5rem;padding-top:1.5rem;}
.value-item{border-top:1px solid hsl(var(--border));padding-top:1rem;}
.value-item .t{font-weight:600;margin-bottom:.375rem;}
.value-item p{font-size:.875rem;color:hsl(var(--muted-foreground));}
.step-grid{gap:2.5rem;}
.step{border-top:1px solid hsl(var(--border));padding-top:1.5rem;}
.step .n{font-size:.875rem;font-weight:500;color:hsl(var(--muted-foreground));margin-bottom:1rem;}
.step h3{font-size:1.125rem;margin-bottom:.5rem;}
.step p{font-size:.875rem;color:hsl(var(--muted-foreground));line-height:1.7;}
.svc-block{display:grid;gap:2.5rem;align-items:center;margin-bottom:6rem;}
.svc-block:last-child{margin-bottom:0;}
.center-narrow{text-align:center;max-width:42rem;margin:0 auto;}
.center-narrow h2{margin-bottom:1.25rem;}
.cta-row{display:flex;flex-wrap:wrap;gap:.75rem;}
.cta-row.center{justify-content:center;}

/* ---------- contact ---------- */
.chan-grid{gap:1px;background:hsl(var(--border));border:1px solid hsl(var(--border));border-radius:var(--radius);overflow:hidden;}
.chan{background:hsl(var(--card));padding:1.75rem;}
.chan .top{display:flex;align-items:center;gap:.625rem;color:hsl(var(--muted-foreground));margin-bottom:.875rem;}
.chan .top span{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;}
.chan .val{font-size:.9375rem;font-weight:500;line-height:1.5;word-break:break-word;}
.chan .note{font-size:.8125rem;color:hsl(var(--muted-foreground));margin-top:.625rem;line-height:1.6;}
.bt-grid{gap:1rem;}
.bt-card{border:1px solid hsl(var(--border));border-radius:var(--radius);padding:1.5rem;display:flex;flex-direction:column;transition:background-color .2s;}
.bt-card:hover{background:hsl(var(--accent));}
.bt-card h3{font-size:1rem;margin-bottom:.5rem;}
.bt-card p{font-size:.875rem;color:hsl(var(--muted-foreground));line-height:1.7;margin-bottom:1rem;}
.bt-card .go{display:inline-flex;align-items:center;gap:.375rem;font-size:.8125rem;font-weight:500;margin-top:auto;}
.aside-box{border:1px solid hsl(var(--border));border-radius:var(--radius);padding:2rem;}
.aside-box .hd{display:flex;align-items:center;gap:.625rem;margin-bottom:1.5rem;}
.aside-box .hd h3{font-size:1rem;}
.aside-row{margin-bottom:1.5rem;}
.aside-row .k{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:hsl(var(--muted-foreground));margin-bottom:.375rem;}
.aside-row .v{font-size:.875rem;font-weight:500;line-height:1.4;word-break:break-word;}
.divider{border-top:1px solid hsl(var(--border));padding-top:1.5rem;}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid hsl(var(--border));}
.footer-grid{display:grid;gap:2.5rem;padding:3.5rem 0 0;}
.footer-brand{font-size:1.25rem;font-weight:600;letter-spacing:-.02em;margin-bottom:.75rem;}
.footer-tag{font-size:.875rem;color:hsl(var(--muted-foreground));line-height:1.7;max-width:20rem;}
.footer-h{font-size:.75rem;font-weight:500;text-transform:uppercase;letter-spacing:.05em;color:hsl(var(--muted-foreground));margin-bottom:1rem;}
.footer-list li{margin-bottom:.625rem;font-size:.875rem;}
.footer-list a,.footer-list span{color:hsl(var(--muted-foreground));transition:color .2s;}
.footer-list a:hover{color:hsl(var(--foreground));}
.footer-list .row{display:flex;gap:.5rem;align-items:flex-start;}
.footer-list .row .ico{margin-top:.15rem;}
.footer-bottom{margin-top:3rem;padding:1.5rem 0 3.5rem;border-top:1px solid hsl(var(--border));font-size:.75rem;color:hsl(var(--muted-foreground));display:flex;flex-direction:column;gap:.5rem;justify-content:space-between;}

/* ---------- responsive ---------- */
@media (min-width:640px){
  .h-hero{font-size:3rem;}
  .value-grid{grid-template-columns:repeat(3,1fr);}
  .metric-grid{grid-template-columns:repeat(4,1fr);}
  .footer-bottom{flex-direction:row;}
  .dots-bordered.two-col{grid-template-columns:repeat(2,1fr);display:grid;gap:0 1rem;}
}
@media (min-width:768px){
  .nav-desktop{display:flex;}
  .menu-btn{display:none;}
  .logo img{height:5rem;}
  .h-hero{font-size:3.75rem;}
  .h-sec,.h-page{font-size:2.25rem;}
  .svc-grid{grid-template-columns:repeat(3,1fr);}
  .prod-grid{grid-template-columns:repeat(2,1fr);}
  .step-grid{grid-template-columns:repeat(4,1fr);}
  .bt-grid{grid-template-columns:repeat(2,1fr);}
  .chan-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:repeat(3,1fr);}
  .page-hero{padding:5rem 0 5rem;}
}
@media (min-width:1024px){
  .hero-grid,.g-2{grid-template-columns:repeat(2,1fr);gap:4rem;}
  .svc-block{grid-template-columns:repeat(2,1fr);}
  .contact-grid{display:grid;grid-template-columns:3fr 2fr;gap:3rem;align-items:start;}
  .aside-box{position:sticky;top:7rem;}
  .chan-grid{grid-template-columns:repeat(4,1fr);}
  .flip-a{order:2;} .flip-b{order:1;}
}