:root{
  --bg:#eef3fb;
  --bg-2:#ffffff;
  --panel:#ffffff;
  --panel-tint:#f4f8fe;
  --panel-bd:rgba(22,48,94,.10);
  --txt:#101c33;
  --muted:#5b6b86;
  --cyan:#0e9ec2;
  --cyan-bright:#22d3ee;
  --blue:#2563eb;
  --accent:#0ea5a5;
  --glow:0 10px 30px rgba(37,99,235,.16);
  --shadow:0 6px 22px rgba(20,40,90,.08);
  --max:1200px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  line-height:1.65;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.lang-en .zh{display:none}
.lang-zh .en{display:none}

/* ambient background (subtle on light) */
.aurora{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.aurora::before,.aurora::after{content:"";position:absolute;border-radius:50%;filter:blur(130px);opacity:.20}
.aurora::before{width:600px;height:600px;background:radial-gradient(circle,#7db0ff,transparent 70%);top:-200px;left:-140px;animation:float1 18s ease-in-out infinite}
.aurora::after{width:560px;height:560px;background:radial-gradient(circle,#7ce0f0,transparent 70%);top:32%;right:-180px;animation:float2 22s ease-in-out infinite}
@keyframes float1{0%,100%{transform:translate(0,0)}50%{transform:translate(60px,80px)}}
@keyframes float2{0%,100%{transform:translate(0,0)}50%{transform:translate(-70px,-50px)}}
.grid-bg{position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(37,99,235,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(37,99,235,.05) 1px,transparent 1px);
  background-size:48px 48px;mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 35%,transparent 100%)}

/* header */
header{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:rgba(255,255,255,.82);border-bottom:1px solid var(--panel-bd)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:19px;letter-spacing:.2px}
.brand .logo{width:36px;height:36px;display:block}
.brand .logo svg,.brand .logo img{width:100%;height:100%;display:block}
.brand .name .accent{color:var(--cyan)}
.navlinks{display:flex;align-items:center;gap:26px}
.navlinks a.navlink{color:var(--muted);font-size:14.5px;font-weight:500;transition:color .2s}
.navlinks a.navlink:hover,.navlinks a.navlink.active{color:var(--blue)}
.langbtn{border:1px solid var(--panel-bd);background:var(--panel);color:var(--txt);padding:7px 14px;border-radius:999px;font-size:13px;font-weight:600;cursor:pointer;transition:all .2s;display:flex;align-items:center;gap:6px}
.langbtn:hover{border-color:var(--blue);color:var(--blue)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:9px;padding:13px 26px;border-radius:12px;font-weight:600;font-size:15px;cursor:pointer;transition:all .25s;border:1px solid transparent}
.btn-primary{background:linear-gradient(135deg,var(--blue),var(--cyan-bright));color:#fff;box-shadow:var(--glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 36px rgba(37,99,235,.28)}
.btn-ghost{border-color:var(--panel-bd);background:var(--panel);color:var(--txt);box-shadow:var(--shadow)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}

/* sections */
section{position:relative;z-index:2;padding:96px 0}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--cyan);margin-bottom:18px}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--cyan)}
h1,h2,h3{line-height:1.15;font-weight:700;letter-spacing:-.5px;color:var(--txt)}
h2{font-size:clamp(28px,4vw,42px);margin-bottom:18px}
.lead{color:var(--muted);font-size:clamp(16px,2vw,18px);max-width:680px}

/* hero (home) */
.hero{padding:120px 0 90px;text-align:center}
.hero h1{font-size:clamp(36px,6.5vw,66px);background:linear-gradient(180deg,#0f1b30,#2563eb);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:24px}
.hero .lead{margin:0 auto 36px}
.hero-cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:64px}
.stats{display:flex;gap:28px;justify-content:center;flex-wrap:wrap}
.stat{background:var(--panel);border:1px solid var(--panel-bd);border-radius:18px;padding:26px 38px;min-width:170px;box-shadow:var(--shadow)}
.stat .num{font-size:42px;font-weight:800;background:linear-gradient(135deg,var(--blue),var(--cyan));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat .lbl{color:var(--muted);font-size:14px;margin-top:4px}

/* page hero (subpages) */
.page-hero{padding:90px 0 24px;text-align:center}
.page-hero h1{font-size:clamp(32px,5vw,52px);background:linear-gradient(180deg,#0f1b30,#2563eb);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:18px}
.page-hero .lead{margin:0 auto}

/* hero tagline (Believe Internet Harbor) */
.hero-tagline{display:inline-block;color:var(--cyan);font-weight:700;letter-spacing:3px;text-transform:uppercase;font-size:13.5px;margin-bottom:26px}
.hero-tagline b{color:var(--blue)}

/* about */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.about-grid p{color:var(--muted);margin-bottom:16px}
.highlight-card{background:linear-gradient(160deg,#eef4ff,#f6fbff);border:1px solid var(--panel-bd);border-radius:22px;padding:36px;box-shadow:var(--shadow)}
.highlight-card h3{font-size:18px;margin-bottom:24px;color:var(--blue)}
.hl-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.hl{padding:18px;border-radius:14px;background:var(--panel);border:1px solid var(--panel-bd)}
.hl .num{font-size:30px;font-weight:800;color:var(--blue)}
.hl .lbl{font-size:13px;color:var(--muted)}

/* services / cards */
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:48px}
.card{background:var(--panel);border:1px solid var(--panel-bd);border-radius:18px;padding:30px;transition:all .3s;position:relative;overflow:hidden;box-shadow:var(--shadow)}
.card.feature{background:linear-gradient(160deg,#eef4ff,#f5fbff)}
.card::after{content:"";position:absolute;inset:0;background:linear-gradient(160deg,rgba(37,99,235,.06),transparent 60%);opacity:0;transition:opacity .3s}
.card:hover{transform:translateY(-5px);border-color:rgba(37,99,235,.35);box-shadow:0 16px 38px rgba(20,40,90,.12)}
.card:hover::after{opacity:1}
.card .ico{width:50px;height:50px;border-radius:13px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(37,99,235,.12),rgba(34,211,238,.12));margin-bottom:20px;position:relative;z-index:1}
.card .ico svg{width:26px;height:26px;stroke:var(--blue)}
.card h3{font-size:19px;margin-bottom:10px;position:relative;z-index:1}
.card p{color:var(--muted);font-size:14.5px;position:relative;z-index:1}

/* band */
.band{background:linear-gradient(135deg,#e9f1ff,#eafaff);border:1px solid var(--panel-bd);border-radius:26px;padding:56px;text-align:center;margin-top:48px;box-shadow:var(--shadow)}
.band p{color:var(--muted);max-width:760px;margin:0 auto 12px}

/* network */
.net-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.loc-list{display:flex;flex-wrap:wrap;gap:11px;margin-top:8px}
.chip{display:inline-flex;align-items:center;gap:8px;padding:9px 16px;border-radius:999px;background:var(--panel);border:1px solid var(--panel-bd);font-size:14px;color:var(--txt);transition:all .2s;box-shadow:var(--shadow)}
.chip:hover{border-color:var(--blue);transform:translateY(-2px)}
.chip .dot{width:8px;height:8px;border-radius:50%;background:var(--cyan);box-shadow:0 0 8px rgba(14,158,194,.6)}
.globe-card{aspect-ratio:1;border-radius:50%;background:radial-gradient(circle at 35% 30%,#ffffff,#e9f1fd 60%,#dceafa);border:1px solid var(--panel-bd);position:relative;display:grid;place-items:center;overflow:hidden;box-shadow:0 20px 50px rgba(20,40,90,.10)}
.globe-card svg{width:100%;height:100%}

/* node cards (network page) */
.node-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;margin-top:40px}
.node{background:var(--panel);border:1px solid var(--panel-bd);border-radius:16px;padding:22px;transition:all .25s;display:flex;align-items:center;gap:14px;box-shadow:var(--shadow)}
.node:hover{transform:translateY(-4px);border-color:rgba(37,99,235,.35)}
.node .pin{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(37,99,235,.12),rgba(34,211,238,.12));flex-shrink:0}
.node .pin svg{width:20px;height:20px;stroke:var(--blue)}
.node .nm{font-weight:600;font-size:15.5px}
.node .sub{font-size:12px;color:var(--cyan);font-weight:600}

/* offices / contact cards */
.office-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:48px}
.office{background:var(--panel);border:1px solid var(--panel-bd);border-radius:20px;padding:0;overflow:hidden;box-shadow:var(--shadow)}
.office-banner{display:block;width:100%;height:170px;object-fit:cover;border-bottom:1px solid var(--panel-bd)}
.office-body{padding:28px 32px}
.office h3{font-size:20px;margin-bottom:14px}
.office .tag{display:inline-block;font-size:12px;font-weight:600;letter-spacing:1px;text-transform:uppercase;color:var(--cyan);margin-bottom:16px}
.office .row{display:flex;gap:12px;align-items:flex-start;color:var(--muted);font-size:14.5px;margin-bottom:12px}
.office .row svg{width:18px;height:18px;stroke:var(--blue);flex-shrink:0;margin-top:3px}
.office a:hover{color:var(--blue)}

/* contact band */
.contact-band{background:linear-gradient(135deg,#e9f1ff,#eafaff);border:1px solid var(--panel-bd);border-radius:26px;padding:60px;text-align:center;box-shadow:var(--shadow)}
.contact-band h2{margin-bottom:14px}
.contact-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-top:32px}

/* footer */
footer{position:relative;z-index:2;border-top:1px solid var(--panel-bd);padding:48px 0 36px;margin-top:40px;background:var(--bg-2)}
.foot{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:20px;color:var(--muted);font-size:14px}
.foot .brand{font-size:16px;color:var(--txt)}
.foot .logo{width:28px;height:28px}
.foot-brand-text{display:flex;flex-direction:column;line-height:1.2}
.foot .slogan{font-size:12px;color:var(--cyan);font-weight:600;letter-spacing:.4px;margin-top:2px}
.foot-links{display:flex;gap:20px}
.foot-links a:hover{color:var(--blue)}

@media(max-width:880px){
  .navlinks .navlink{display:none}
  .about-grid,.net-grid,.svc-grid,.office-grid{grid-template-columns:1fr}
  .hl-grid{grid-template-columns:1fr 1fr}
  section{padding:72px 0}
  .band,.contact-band{padding:40px 24px}
}