:root{
  --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
  --blue:#2980FE;
  --blue-dark:#1768E8;
  --text:#263246;
  --muted:#667085;
  --light:#f5f7fb;
  --line:#e6eaf2;
  --card:#ffffff;
  --soft:#eef5ff;
  --radius:26px;
  --shadow:0 18px 45px rgba(31,48,90,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:#fff;line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(1120px,calc(100% - 32px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-shell{width:min(1180px,calc(100% - 28px));margin:0 auto;display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:#1f2b45;white-space:nowrap}
.brand img{width:38px;height:38px;border-radius:12px;object-fit:cover}
.site-nav{display:none;position:absolute;left:14px;right:14px;top:72px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:20px;padding:12px;grid-template-columns:1fr;gap:6px}
.site-nav a{padding:10px 12px;border-radius:12px;color:#4b5871;font-size:15px}
.site-nav a.active,.site-nav a:hover{background:var(--soft);color:var(--blue)}
.nav-toggle{display:none}
.nav-toggle-label{display:grid;gap:5px;width:42px;height:42px;place-content:center;border:1px solid var(--line);border-radius:14px;background:#fff}
.nav-toggle-label span{width:20px;height:2px;background:#263246;border-radius:2px}
.nav-toggle:checked ~ .site-nav{display:grid}
.section{padding:64px 0}
.section-soft{background:var(--light)}
.section-title{font-size:30px;line-height:1.18;margin:0 0 14px;color:#172033;letter-spacing:-.02em}
.section-lead{margin:0 0 28px;color:var(--muted);max-width:760px}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;background:#eaf3ff;color:var(--blue);font-size:13px;font-weight:700;margin-bottom:14px}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 24px;border-radius:999px;background:#2980FE;color:#fff!important;font-weight:800;border:0;box-shadow:0 12px 28px rgba(41,128,254,.25);transition:.2s ease;white-space:nowrap}
.download-btn:hover{background:#1768E8;transform:translateY(-1px);box-shadow:0 15px 32px rgba(23,104,232,.28)}
.text-link{color:var(--blue);font-weight:800}
.connection-workspace-hero{padding:32px 0 58px;background:var(--gradient);color:#fff;position:relative;overflow:hidden}
.connection-workspace-hero:before{content:"";position:absolute;inset:auto -10% -30% -10%;height:320px;background:radial-gradient(circle,rgba(255,255,255,.25),transparent 60%)}
.hero-grid{position:relative;z-index:2;display:grid;gap:32px;align-items:center}
.hero-copy h1{font-size:38px;line-height:1.12;margin:0 0 18px;letter-spacing:-.04em}
.hero-copy p{font-size:17px;margin:0 0 22px;color:rgba(255,255,255,.88)}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.hero-tags span{padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.25);font-size:13px}
.hero-visual{position:relative;min-height:360px;display:grid;place-items:center}
.hero-device{width:min(360px,82vw);border-radius:34px;filter:drop-shadow(0 25px 45px rgba(10,22,60,.25))}
.status-panel{position:absolute;right:2%;top:8%;background:rgba(255,255,255,.94);color:#1f2b45;border-radius:24px;padding:18px;box-shadow:var(--shadow);width:210px;border:1px solid rgba(255,255,255,.7)}
.status-row{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:10px 0;color:#59677f;font-size:14px}
.status-dot{width:9px;height:9px;background:#2ccf83;border-radius:50%;box-shadow:0 0 0 6px rgba(44,207,131,.14)}
.float-card{position:absolute;left:0;bottom:20px;background:#fff;color:#1f2b45;border-radius:22px;padding:14px 16px;box-shadow:var(--shadow);width:200px}
.float-card strong{display:block;color:#172033}.float-card span{color:var(--muted);font-size:13px}
.quick-task-entries{display:grid;gap:16px;margin-top:-38px;position:relative;z-index:4}
.quick-card,.task-card,.capability-card,.info-card,.faq-item,.risk-card,.step-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 10px 30px rgba(30,50,90,.06)}
.quick-card{padding:22px}.quick-card small{color:var(--blue);font-weight:800}.quick-card h3,.task-card h3,.capability-card h3,.info-card h3{margin:8px 0 8px;font-size:20px}.quick-card p,.task-card p,.capability-card p,.info-card p{margin:0 0 12px;color:var(--muted)}
.connection-capability-overview{display:grid;gap:16px}.capability-card{padding:24px}.capability-card.feature{background:linear-gradient(180deg,#fff,#f3f7ff);border-color:#dce8ff}
.task-card{padding:24px}.split-section{display:grid;gap:28px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:34px;padding:24px;box-shadow:var(--shadow)}
.feature-list{display:grid;gap:12px;margin:18px 0;padding:0;list-style:none}.feature-list li{display:flex;gap:10px;align-items:flex-start;color:#4d5a72}.feature-list li:before{content:"";width:9px;height:9px;border-radius:50%;background:var(--blue);margin-top:9px;flex:0 0 auto}
.image-card{background:linear-gradient(180deg,#f7fbff,#eef3ff);border-radius:30px;padding:18px;border:1px solid #e1e9f7}
.encrypted-tunnel-section .secure-panel{display:grid;gap:16px}.secure-grid{display:grid;gap:16px}.info-card{padding:22px}.route-layout,.device-layout,.checkup-layout,.about-grid,.page-grid{display:grid;gap:24px;align-items:start}.route-status{background:#fff;border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:var(--shadow)}
.line-meter{height:12px;background:#e8eef8;border-radius:999px;overflow:hidden;margin:16px 0}.line-meter span{display:block;width:72%;height:100%;background:var(--gradient);border-radius:inherit}
.device-stack{display:grid;gap:14px}.device-chip{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border:1px solid var(--line);border-radius:18px;background:#fff;color:#526079}
.data-boundary-section .data-grid,.usage-grid,.risk-grid,.faq-grid,.process-steps{display:grid;gap:16px}
.process-steps{counter-reset:step}.step-card{padding:22px;position:relative}.step-card:before{counter-increment:step;content:counter(step);display:grid;place-items:center;width:36px;height:36px;border-radius:12px;background:var(--blue);color:#fff;font-weight:800;margin-bottom:12px}
.risk-card{padding:20px;border-left:4px solid var(--blue)}.risk-card h3{margin:0 0 8px}.risk-card p{margin:0 0 8px;color:var(--muted)}.risk-card strong{color:#172033}
.faq-item{padding:22px}.faq-item h3{margin:0 0 8px;font-size:18px}.faq-item p{margin:0;color:var(--muted)}
.cta-section{background:var(--gradient);color:#fff;text-align:center;padding:58px 0;border-radius:34px;margin:36px auto;width:min(1120px,calc(100% - 32px));position:relative;overflow:hidden}.cta-section h2{margin:0 0 12px;font-size:30px}.cta-section p{margin:0 auto 22px;max-width:720px;color:rgba(255,255,255,.88)}
.page-hero{padding:58px 0 30px;background:linear-gradient(180deg,#f5f8ff,#fff)}.page-hero h1{font-size:36px;line-height:1.15;margin:0 0 14px;color:#172033}.page-hero p{color:var(--muted);max-width:760px;margin:0 0 20px}
.article-card{background:#fff;border:1px solid var(--line);border-radius:30px;padding:24px;box-shadow:var(--shadow)}.article-card h2{margin:0 0 12px;font-size:24px}.article-card p{color:#526079}.article-card ul,.article-card ol{padding-left:20px;color:#526079}.side-panel{position:sticky;top:96px;background:#f7faff;border:1px solid #dce8ff;border-radius:28px;padding:22px}.side-panel h3{margin:0 0 12px}.side-panel a{display:block;color:var(--blue);font-weight:800;margin:10px 0}
.download-page-card{text-align:center;background:#fff;border:1px solid var(--line);border-radius:34px;padding:34px;box-shadow:var(--shadow)}.download-page-card .download-btn{margin:18px 0 8px}.download-steps{display:grid;gap:14px;margin-top:26px;text-align:left}
.site-footer{background:#172033;color:#d4d9e5;padding:48px 0 0}.footer-grid{display:grid;gap:28px}.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:20px}.footer-brand img{width:36px;height:36px;border-radius:12px}.site-footer h3{color:#fff;margin:0 0 12px}.site-footer a{display:block;color:#d4d9e5;margin:8px 0}.site-footer p{color:#aeb7c9}.footer-bottom{text-align:center;border-top:1px solid rgba(255,255,255,.12);margin-top:32px;padding:18px;color:#aeb7c9;font-size:14px}
@media (min-width:720px){
  .quick-task-entries,.secure-grid,.data-boundary-section .data-grid,.usage-grid,.faq-grid{grid-template-columns:repeat(2,1fr)}
  .process-steps,.risk-grid,.download-steps{grid-template-columns:repeat(2,1fr)}
  .connection-capability-overview{grid-template-columns:repeat(2,1fr)}
  .capability-card.feature{grid-column:span 2}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}
}
@media (min-width:980px){
  .nav-toggle-label{display:none}.site-nav{position:static;display:flex;align-items:center;background:transparent;border:0;box-shadow:none;border-radius:0;padding:0;gap:2px}.site-nav a{font-size:14px;padding:9px 10px}
  .connection-workspace-hero{padding:62px 0 86px}.hero-grid{grid-template-columns:1.02fr .98fr}.hero-copy h1{font-size:58px}.hero-copy p{font-size:19px}
  .quick-task-entries{grid-template-columns:repeat(4,1fr)}
  .connection-capability-overview{grid-template-columns:1.15fr 1fr 1fr}.capability-card.feature{grid-column:span 1;grid-row:span 2}
  .split-section,.route-layout,.device-layout,.checkup-layout,.about-grid{grid-template-columns:1fr 1fr;padding:34px}.page-grid{grid-template-columns:minmax(0,1fr) 320px}.secure-panel{grid-template-columns:1.1fr .9fr;align-items:center}.secure-grid,.risk-grid{grid-template-columns:repeat(3,1fr)}.process-steps{grid-template-columns:repeat(3,1fr)}.usage-grid{grid-template-columns:repeat(3,1fr)}
  .section-title{font-size:38px}.page-hero h1{font-size:46px}
}
@media (min-width:1160px){.site-nav a{padding:9px 12px}}
@media (max-width:520px){.status-panel{position:relative;right:auto;top:auto;width:100%;margin-top:10px}.float-card{position:relative;left:auto;bottom:auto;width:100%;margin-top:12px}.hero-visual{min-height:auto}.hero-copy h1{font-size:34px}.section{padding:48px 0}.download-btn{width:100%}.cta-section .download-btn{width:auto}.page-hero h1{font-size:32px}}