:root{
  --bg:#05070f;
  --bg-2:#0a0f1f;
  --panel:rgba(255,255,255,.04);
  --panel-brd:rgba(255,255,255,.09);
  --txt:#e8edf7;
  --muted:#8c97b0;
  --cyan:#22d3ee;
  --blue:#3b82f6;
  --violet:#8b5cf6;
  --grad:linear-gradient(120deg,#22d3ee,#3b82f6 55%,#8b5cf6);
  --glow:0 0 40px rgba(59,130,246,.35);
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--txt);
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}
::selection{background:rgba(34,211,238,.28);color:#fff}
a{color:inherit;text-decoration:none}
section{position:relative}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
/* latin/number runs inside CJK get a touch of breathing room & tabular figures */
.nw{white-space:nowrap}
.eyebrow{
  display:inline-block;font-size:12.5px;letter-spacing:.26em;text-transform:uppercase;
  color:var(--cyan);font-weight:600;margin-bottom:16px;
}
.eyebrow::before{content:"";display:inline-block;width:26px;height:1px;background:var(--cyan);vertical-align:middle;margin-right:10px;opacity:.7}
h2.title{font-size:clamp(28px,3.8vw,46px);font-weight:800;letter-spacing:-.01em;line-height:1.25;text-wrap:balance}
.lead{color:var(--muted);max-width:64ch;margin-top:18px;font-size:17px;line-height:1.8;text-wrap:pretty}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ===== NAV ===== */
header{position:fixed;top:0;left:0;right:0;z-index:100;transition:.35s ease}
header.scrolled{background:rgba(5,7,15,.78);backdrop-filter:blur(18px);border-bottom:1px solid var(--panel-brd)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:19px;letter-spacing:.5px}
.brand .mark{width:38px;height:38px;border-radius:11px;background:var(--grad);display:grid;place-items:center;box-shadow:var(--glow);position:relative;overflow:hidden;flex:none}
.brand .mark svg{width:22px;height:22px}
.brand small{display:block;font-size:11px;font-weight:500;color:var(--muted);letter-spacing:.18em}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a{font-size:15px;color:var(--muted);font-weight:500;transition:.25s;position:relative}
.nav-links a:hover{color:var(--txt)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-6px;height:2px;width:0;background:var(--grad);transition:.3s}
.nav-links a:hover::after{width:100%}
.nav-cta{display:flex;align-items:center;gap:14px}
.user-btn{display:inline-flex;align-items:center;gap:9px;padding:10px 20px;border-radius:999px;font-weight:600;font-size:14.5px;background:var(--grad);color:#fff;box-shadow:var(--glow);transition:.3s;position:relative}
.user-btn:hover{transform:translateY(-2px);box-shadow:0 8px 34px rgba(59,130,246,.55)}
.user-btn svg{width:17px;height:17px}
.burger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px}
.burger span{width:24px;height:2px;background:var(--txt);border-radius:2px;transition:.3s}

/* ===== HERO ===== */
.hero{min-height:100vh;display:flex;align-items:center;position:relative;overflow:hidden;padding-top:74px}
#net-canvas{position:absolute;inset:0;width:100%;height:100%;z-index:0}
.hero::after{content:"";position:absolute;inset:0;z-index:1;
  background:radial-gradient(ellipse 70% 60% at 70% 30%,rgba(59,130,246,.18),transparent 60%),
             radial-gradient(ellipse 50% 50% at 15% 80%,rgba(139,92,246,.14),transparent 60%),
             linear-gradient(180deg,transparent 60%,var(--bg));
  pointer-events:none}
.hero .wrap{position:relative;z-index:2;width:100%}
.hero-badge{display:inline-flex;align-items:center;gap:9px;padding:7px 16px;border-radius:999px;background:var(--panel);border:1px solid var(--panel-brd);font-size:13.5px;color:var(--muted);backdrop-filter:blur(8px);margin-bottom:26px}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:#22d3ee;box-shadow:0 0 12px #22d3ee;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.hero h1{font-size:clamp(38px,6.2vw,74px);font-weight:850;line-height:1.14;letter-spacing:-.02em;max-width:18ch}
.hero h1 .grad-text{margin-right:.04em}
.hero p.sub{color:var(--muted);font-size:clamp(16px,1.45vw,19px);margin-top:22px;max-width:46ch;line-height:1.85;text-wrap:pretty}
.hero p.sub-spec{margin-top:12px;color:#aeb9d0}
.hero p.sub .hl{color:var(--txt);font-weight:500;white-space:nowrap}
.hero p.sub .hl em{font-style:normal;font-weight:700;color:var(--cyan);font-variant-numeric:tabular-nums;letter-spacing:.01em}
.dot-sep{display:inline-block;width:5px;height:5px;border-radius:50%;background:var(--cyan);opacity:.7;margin:0 12px;vertical-align:middle}
.hero-actions{display:flex;gap:14px;margin-top:40px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:9px;padding:14px 28px;border-radius:12px;font-weight:600;font-size:15.5px;transition:.3s;cursor:pointer}
.btn-primary{background:var(--grad);color:#fff;box-shadow:var(--glow)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 40px rgba(59,130,246,.5)}
.btn-ghost{background:var(--panel);border:1px solid var(--panel-brd);color:var(--txt)}
.btn-ghost:hover{border-color:var(--cyan);background:rgba(34,211,238,.08)}
.btn-wechat{background:linear-gradient(120deg,#22c55e,#16a34a);color:#fff;border:none;font-family:inherit;box-shadow:0 0 30px rgba(34,197,94,.35)}
.btn-wechat:hover{transform:translateY(-3px);box-shadow:0 14px 40px rgba(34,197,94,.5)}
.btn-wechat svg{width:18px;height:18px}

/* ===== WECHAT QR MODAL ===== */
.qr-overlay{position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;padding:24px;
  background:rgba(3,5,12,.7);backdrop-filter:blur(8px);opacity:0;visibility:hidden;transition:.3s}
.qr-overlay.open{opacity:1;visibility:visible}
.qr-card{position:relative;width:min(360px,92vw);background:linear-gradient(180deg,#0e1426,#0a0f1f);
  border:1px solid var(--panel-brd);border-radius:24px;padding:34px 30px 28px;text-align:center;
  box-shadow:0 30px 80px rgba(0,0,0,.6);transform:scale(.9) translateY(20px);transition:.35s cubic-bezier(.2,.8,.2,1)}
.qr-overlay.open .qr-card{transform:none}
.qr-close{position:absolute;top:14px;right:18px;background:none;border:none;color:var(--muted);font-size:28px;line-height:1;cursor:pointer;transition:.25s}
.qr-close:hover{color:#fff;transform:rotate(90deg)}
.qr-card h3{font-size:20px;font-weight:800}
.qr-sub{color:var(--muted);font-size:14px;margin-top:6px}
.qr-img{margin:22px auto 16px;width:230px;max-width:72vw;border-radius:16px;overflow:hidden;background:#fff;padding:8px;box-shadow:var(--glow)}
.qr-img img{width:100%;height:auto;display:block;border-radius:10px}
.qr-tip{color:var(--muted);font-size:13px}
.hero-stats{display:flex;gap:clamp(28px,4vw,52px);margin-top:64px;flex-wrap:wrap}
.hero-stats .stat .num{font-size:clamp(32px,3.4vw,46px);font-weight:850;line-height:1;letter-spacing:-.01em;font-variant-numeric:tabular-nums}
.hero-stats .stat .lbl{color:var(--muted);font-size:14px;margin-top:10px;letter-spacing:.02em}

/* ===== SECTION SHELL ===== */
.sec{padding:110px 0}
.sec-head{margin-bottom:54px;max-width:780px}
.reveal{opacity:0;transform:translateY(34px);transition:.8s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* ===== TRIPLE NETWORK ===== */
.triple{background:linear-gradient(180deg,var(--bg),var(--bg-2))}
.triple-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:60px;align-items:center}
.carrier-row{display:flex;gap:18px;margin:30px 0}
.carrier{flex:1;text-align:center;padding:22px 12px;border-radius:16px;background:var(--panel);border:1px solid var(--panel-brd);transition:.35s}
.carrier:hover{transform:translateY(-6px);border-color:var(--cyan);box-shadow:var(--glow)}
.carrier b{font-size:22px;display:block;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.carrier span{font-size:12.5px;color:var(--muted)}
.triple-points li{list-style:none;padding:13px 0 13px 34px;position:relative;color:var(--muted);border-bottom:1px solid rgba(255,255,255,.05)}
.triple-points li::before{content:"";position:absolute;left:0;top:18px;width:18px;height:18px;border-radius:6px;background:var(--grad);box-shadow:var(--glow)}
.triple-points li b{color:var(--txt)}
.net-diagram{position:relative;aspect-ratio:1;display:grid;place-items:center}
.net-diagram svg{width:100%;height:100%;overflow:visible}
.ring{fill:none;stroke:rgba(255,255,255,.07);stroke-width:1}
.orbit-dot{fill:var(--cyan);filter:drop-shadow(0 0 6px var(--cyan))}
.core-label{font:700 15px/1 "PingFang SC",sans-serif;fill:#fff;text-anchor:middle}

/* ===== CORE BUSINESS TABS ===== */
.tabs{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:38px}
.tab{padding:14px 26px;border-radius:14px;border:1px solid var(--panel-brd);background:var(--panel);cursor:pointer;font-weight:600;font-size:16px;color:var(--muted);transition:.3s;display:flex;align-items:center;gap:11px}
.tab .ti{width:24px;height:24px;color:var(--cyan)}
.tab.active{color:#fff;border-color:transparent;background:var(--grad);box-shadow:var(--glow)}
.tab.active .ti{color:#fff}
.panel{display:none;animation:fade .5s ease}
.panel.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{padding:28px 24px;border-radius:18px;background:var(--panel);border:1px solid var(--panel-brd);transition:.35s;position:relative;overflow:hidden}
.feat::before{content:"";position:absolute;inset:0;background:var(--grad);opacity:0;transition:.35s;z-index:0}
.feat:hover{transform:translateY(-6px);border-color:transparent}
.feat:hover::before{opacity:.12}
.feat .ic{width:46px;height:46px;border-radius:12px;background:rgba(34,211,238,.12);display:grid;place-items:center;margin-bottom:16px;position:relative;z-index:1;font-size:22px}
.feat h4{font-size:18px;position:relative;z-index:1}
.feat p{color:var(--muted);font-size:14.5px;margin-top:8px;position:relative;z-index:1}

/* ===== GLOBAL MAP ===== */
.map-wrap{background:linear-gradient(180deg,var(--bg-2),var(--bg))}
.map-stage{position:relative;border-radius:24px;border:1px solid var(--panel-brd);background:radial-gradient(ellipse at 50% 40%,rgba(59,130,246,.1),transparent 70%),var(--panel);padding:30px;overflow:hidden}
.map-svg{width:100%;height:auto;display:block}
.pop{cursor:pointer}
.pop circle.core{fill:var(--cyan);filter:drop-shadow(0 0 6px var(--cyan))}
.pop circle.halo{fill:var(--cyan);opacity:.25;transform-origin:center;animation:ripple 3s infinite ease-out}
@keyframes ripple{0%{transform:scale(.6);opacity:.5}100%{transform:scale(3);opacity:0}}
.pop:hover circle.core{fill:#fff}
.pop text{font:600 11px sans-serif;fill:#cdd6ea;opacity:0;transition:.2s;text-anchor:middle}
.pop:hover text{opacity:1}
.map-legend{display:flex;gap:30px;flex-wrap:wrap;margin-top:26px;color:var(--muted);font-size:14px}
.map-legend b{color:var(--txt)}
.region-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px}
.region{padding:24px;border-radius:16px;background:var(--panel);border:1px solid var(--panel-brd);transition:.3s}
.region:hover{border-color:var(--cyan);transform:translateY(-4px)}
.region h4{font-size:17px;margin-bottom:6px}
.region h4 .tag{font-size:11px;color:var(--cyan);border:1px solid rgba(34,211,238,.4);padding:2px 9px;border-radius:999px;margin-left:8px;vertical-align:middle}
.region p{color:var(--muted);font-size:14px}

/* ===== SOLUTIONS ===== */
.sol-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.sol{padding:34px;border-radius:20px;background:var(--panel);border:1px solid var(--panel-brd);transition:.35s;position:relative;overflow:hidden}
.sol:hover{transform:translateY(-6px);box-shadow:var(--glow);border-color:rgba(34,211,238,.4)}
.sol .pill{display:inline-block;font-size:12px;color:var(--cyan);background:rgba(34,211,238,.1);padding:5px 13px;border-radius:999px;margin-bottom:14px;font-weight:600}
.sol h3{font-size:21px}
.sol ul{margin-top:16px}
.sol li{list-style:none;color:var(--muted);font-size:14.5px;padding:7px 0 7px 26px;position:relative}
.sol li::before{content:"✓";position:absolute;left:0;color:var(--cyan);font-weight:700}

/* ===== TECH & PROCESS ===== */
.tech-wrap{background:linear-gradient(180deg,var(--bg),var(--bg-2))}
.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.tech-card{padding:30px 26px;border-radius:18px;background:var(--panel);border:1px solid var(--panel-brd);transition:.35s;position:relative;overflow:hidden}
.tech-card:hover{transform:translateY(-6px);border-color:rgba(34,211,238,.4);box-shadow:var(--glow)}
.tech-card .tn{font-size:30px;font-weight:850;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;opacity:.85}
.tech-card h4{font-size:18px;margin:6px 0 8px}
.tech-card p{color:var(--muted);font-size:14.5px}
.process-title{font-size:24px;font-weight:800;margin:64px 0 30px;text-align:center}
.process{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;position:relative}
.process::before{content:"";position:absolute;top:22px;left:8%;right:8%;height:2px;background:linear-gradient(90deg,transparent,rgba(34,211,238,.5),transparent)}
.step{text-align:center;position:relative;padding:0 6px}
.step .dot{width:46px;height:46px;margin:0 auto 16px;border-radius:50%;background:var(--bg-2);border:2px solid var(--cyan);color:var(--cyan);display:grid;place-items:center;font-weight:800;font-size:18px;position:relative;z-index:1;transition:.35s}
.step:hover .dot{background:var(--grad);color:#fff;border-color:transparent;box-shadow:var(--glow);transform:scale(1.12)}
.step h5{font-size:15.5px;margin-bottom:8px}
.step p{color:var(--muted);font-size:13.5px;line-height:1.55}

/* ===== CLIENTS ===== */
.clients{background:linear-gradient(180deg,var(--bg-2),var(--bg))}
.client-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cc{padding:30px;border-radius:18px;background:var(--panel);border:1px solid var(--panel-brd);transition:.4s;position:relative;overflow:hidden}
.cc::after{content:"";position:absolute;top:0;left:0;width:100%;height:3px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:.4s}
.cc:hover{transform:translateY(-8px);box-shadow:0 20px 50px rgba(0,0,0,.4)}
.cc:hover::after{transform:scaleX(1)}
.cc .cnum{font-size:30px;font-weight:850;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.cc h4{font-size:18px;margin:6px 0 10px}
.cc p{color:var(--muted);font-size:14px}

/* ===== GUARANTEE ===== */
.guard-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.guard{text-align:center;padding:30px 18px;border-radius:18px;background:var(--panel);border:1px solid var(--panel-brd);transition:.3s}
.guard:hover{transform:translateY(-6px);border-color:var(--cyan)}
.guard .big{font-size:38px;font-weight:850;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.guard p{color:var(--muted);font-size:14px;margin-top:8px}

/* ===== CONTACT / CTA ===== */
.cta-band{margin:0 24px 100px}
.cta-inner{max-width:var(--maxw);margin:0 auto;border-radius:28px;padding:64px 50px;text-align:center;position:relative;overflow:hidden;background:linear-gradient(120deg,rgba(34,211,238,.14),rgba(139,92,246,.14));border:1px solid var(--panel-brd)}
.cta-inner h2{font-size:clamp(28px,4vw,42px);font-weight:850}
.cta-inner p{color:var(--muted);margin:16px auto 36px;max-width:520px}
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;max-width:880px;margin:0 auto;text-align:left}
.contact-card{padding:26px;border-radius:18px;background:rgba(5,7,15,.45);border:1px solid var(--panel-brd);transition:.35s;display:block}
.contact-card:hover{transform:translateY(-5px);border-color:var(--cyan);box-shadow:var(--glow)}
.contact-card .ci{font-size:24px}
.contact-card .ck{display:block;color:var(--muted);font-size:13px;margin:12px 0 6px;letter-spacing:.05em}
.contact-card b{display:block;font-size:19px;font-weight:800}
.contact-card .cs{display:block;color:var(--muted);font-size:13px;margin-top:6px}
.contact-card .phone-line{display:block;font-size:19px;font-weight:800;color:var(--txt);line-height:1.5;transition:.2s;white-space:nowrap}
.contact-card .phone-line:hover{color:var(--cyan)}

/* ===== FOOTER ===== */
footer{padding:70px 0 40px;border-top:1px solid var(--panel-brd);background:var(--bg-2)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
.foot-grid h5{font-size:14px;letter-spacing:.06em;margin-bottom:16px;color:var(--txt)}
.foot-grid a,.foot-grid p{display:block;color:var(--muted);font-size:14px;padding:5px 0;transition:.25s}
.foot-grid a:hover{color:var(--cyan)}
.foot-bottom{border-top:1px solid rgba(255,255,255,.06);margin-top:46px;padding-top:26px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;color:var(--muted);font-size:13px}
.foot-bottom .beian{color:var(--muted);transition:.25s}
.foot-bottom .beian:hover{color:var(--cyan)}

/* ===== TYPOGRAPHY & DETAIL REFINEMENTS ===== */
.feat p,.region p,.cc p,.tech-card p,.step p,.guard p,.sol li,.triple-points li,.contact-card .cs{text-wrap:pretty}
.feat h4,.cc h4,.tech-card h4,.region h4,.sol h3,.step h5{letter-spacing:-.01em}
.feat p,.tech-card p{line-height:1.7}
.region p,.cc p{line-height:1.7}
/* tabular figures for all stat numerals */
.cc .cnum,.guard .big,.tech-card .tn,.carrier b,.contact-card b,.contact-card .phone-line{font-variant-numeric:tabular-nums}
.carrier b{letter-spacing:.02em}
/* gentler dividers + tighter list rhythm */
.triple-points li{line-height:1.6;padding-top:14px;padding-bottom:14px}
.triple-points li:last-child{border-bottom:none}
/* section heads breathe a bit more */
.sec-head .title{margin-top:2px}
/* map legend as neat chips */
.map-legend span{display:inline-flex;align-items:center;gap:7px;padding:8px 14px;border-radius:999px;background:rgba(255,255,255,.03);border:1px solid var(--panel-brd)}
.map-legend b{color:var(--cyan);font-variant-numeric:tabular-nums}
/* solution list spacing */
.sol li{line-height:1.6}
/* footer legibility */
.foot-grid p{line-height:1.7}
.foot-bottom a,.foot-bottom span{line-height:1.7}

/* ===== RESPONSIVE ===== */
@media(max-width:880px){
  .nav-links{position:fixed;top:74px;left:0;right:0;flex-direction:column;gap:0;padding:10px 24px 24px;background:rgba(5,7,15,.97);backdrop-filter:blur(18px);border-bottom:1px solid var(--panel-brd);transform:translateY(-160%);transition:.4s}
  .nav-links.open{transform:none}
  .nav-links a{padding:14px 0;width:100%;border-bottom:1px solid rgba(255,255,255,.05)}
  .burger{display:flex}
  .triple-grid{grid-template-columns:1fr;gap:36px}
  .feat-grid,.region-grid,.client-cards,.tech-grid{grid-template-columns:1fr}
  .sol-grid{grid-template-columns:1fr}
  .guard-grid{grid-template-columns:repeat(2,1fr)}
  .process{grid-template-columns:1fr;gap:24px}
  .process::before{top:0;bottom:0;left:22px;right:auto;width:2px;height:auto;background:linear-gradient(180deg,transparent,rgba(34,211,238,.5),transparent)}
  .step{display:grid;grid-template-columns:46px 1fr;column-gap:16px;row-gap:6px;text-align:left;align-items:start}
  .step .dot{margin:0;grid-column:1;grid-row:1 / span 2}
  .step h5{grid-column:2;grid-row:1;align-self:center;margin-bottom:0}
  .step p{grid-column:2;grid-row:2}
  .contact-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .hero-stats{gap:30px}
  .user-btn .lbl{display:none}
  .user-btn{padding:10px 14px}
}
@media(max-width:520px){
  .guard-grid{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr}
  .feat-grid{grid-template-columns:1fr}
}