:root{
  --primary:#2980FE;
  --primary-dark:#1768E8;
  --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
  --text:#1f2937;
  --muted:#64748b;
  --light:#f6f8fc;
  --lighter:#eef4ff;
  --line:#e5e7eb;
  --card:#ffffff;
  --shadow:0 18px 45px rgba(31,41,55,.08);
  --radius:24px;
}
*{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:1.75;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;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,.92);backdrop-filter:blur(18px);border-bottom:1px solid rgba(229,231,235,.8)}
.header-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:#111827;letter-spacing:.02em}
.logo-img{width:42px;height:42px;border-radius:12px;object-fit:cover;box-shadow:0 8px 20px rgba(41,128,254,.18)}
.brand-text{font-size:20px}
.nav-toggle{display:none}
.nav-toggle-label{display:flex;flex-direction:column;gap:5px;cursor:pointer;padding:10px;border:1px solid var(--line);border-radius:14px;background:#fff}
.nav-toggle-label span{width:22px;height:2px;background:#111827;border-radius:999px}
.site-nav{position:absolute;top:68px;left:16px;right:16px;display:none;flex-direction:column;padding:14px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.site-nav a{font-size:15px;color:#334155;padding:10px 12px;border-radius:12px}
.site-nav a:hover,.site-nav a.active{color:var(--primary);background:#eef5ff}
.nav-toggle:checked~.site-nav{display:flex}
.section{padding:64px 0}
.section-soft{background:var(--light)}
.section-title{font-size:30px;line-height:1.22;margin:0 0 14px;color:#111827;letter-spacing:-.03em}
.section-lead{font-size:16px;color:var(--muted);max-width:760px;margin:0 0 28px}
.badge{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:#eef5ff;color:var(--primary);font-weight:700;font-size:13px;margin-bottom:16px}
.badge.white{background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.28)}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:13px 24px;border-radius:999px;background:#2980FE;color:#fff!important;font-weight:800;box-shadow:0 14px 28px rgba(41,128,254,.28);transition:transform .2s ease,background .2s ease,box-shadow .2s ease}
.download-btn:hover{background:#1768E8;transform:translateY(-2px);box-shadow:0 18px 34px rgba(23,104,232,.32)}
.text-link{display:inline-flex;align-items:center;color:var(--primary);font-weight:750;margin-top:12px}
.text-link:after{content:"→";margin-left:6px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:0 12px 32px rgba(31,41,55,.05)}
.card h3{margin:0 0 8px;font-size:20px;line-height:1.35;color:#111827}
.card p{margin:0;color:var(--muted)}
.card ul,.content-card ul{padding-left:20px;margin:12px 0 0;color:var(--muted)}
.card li,.content-card li{margin:6px 0}
.vpn-network-hero{position:relative;overflow:hidden;background:var(--gradient);color:#fff;padding:72px 0 84px}
.vpn-network-hero:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 18% 22%,rgba(255,255,255,.25),transparent 24%),radial-gradient(circle at 82% 14%,rgba(255,255,255,.18),transparent 28%),linear-gradient(135deg,rgba(255,255,255,.14) 1px,transparent 1px);background-size:auto,auto,42px 42px;opacity:.75}
.hero-grid{position:relative;display:grid;gap:36px;align-items:center}
.hero-copy h1{font-size:40px;line-height:1.12;margin:0 0 18px;letter-spacing:-.05em}
.hero-copy p{font-size:17px;color:rgba(255,255,255,.9);margin:0 0 24px;max-width:660px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.hero-tags span,.floating-tag{display:inline-flex;align-items:center;padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.26);color:#fff;font-size:13px;font-weight:700}
.hero-visual{position:relative;min-height:320px;display:flex;align-items:center;justify-content:center}
.hero-device{width:min(430px,90%);border-radius:32px;box-shadow:0 28px 70px rgba(16,24,40,.22);background:rgba(255,255,255,.12);padding:14px}
.hero-device img{border-radius:24px;object-fit:cover}
.floating-tag{position:absolute;backdrop-filter:blur(10px)}
.tag-1{top:10%;left:2%}.tag-2{top:18%;right:0}.tag-3{bottom:16%;left:1%}.tag-4{right:5%;bottom:6%}
.node-overview{margin-top:-46px;position:relative;z-index:5}
.node-grid{display:grid;gap:16px}
.node-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:var(--shadow)}
.node-card .label{display:inline-flex;color:var(--primary);background:#eef5ff;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:800;margin-bottom:10px}
.node-card h3{font-size:18px;margin:0 0 8px}.node-card p{color:var(--muted);margin:0}.node-card a{color:var(--primary);font-weight:750;margin-top:10px;display:inline-block}
.split-section{display:grid;gap:28px;align-items:center}
.image-panel{background:linear-gradient(180deg,#f8fbff,#eef4ff);border:1px solid var(--line);border-radius:32px;padding:22px;box-shadow:var(--shadow)}
.image-panel img{border-radius:24px;margin:auto}
.feature-list{display:grid;gap:12px;margin:18px 0}
.feature-item{display:flex;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--line);border-radius:18px;background:#fff}
.feature-dot{width:10px;height:10px;border-radius:999px;background:var(--primary);margin-top:9px;flex:0 0 auto;box-shadow:0 0 0 6px #e8f1ff}
.feature-item strong{display:block;color:#111827}.feature-item span{display:block;color:var(--muted);font-size:14px}
.global-nodes-section{background:linear-gradient(180deg,#ffffff,#f4f7ff)}
.map-panel{position:relative;overflow:hidden;border-radius:32px;background:var(--gradient);padding:26px;color:#fff;min-height:320px;display:flex;align-items:center;justify-content:center}
.map-panel:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 30% 32%,rgba(255,255,255,.38) 0 3px,transparent 4px),radial-gradient(circle at 70% 42%,rgba(255,255,255,.34) 0 3px,transparent 4px),radial-gradient(circle at 48% 68%,rgba(255,255,255,.28) 0 3px,transparent 4px),linear-gradient(30deg,transparent 48%,rgba(255,255,255,.22) 49%,rgba(255,255,255,.22) 50%,transparent 51%);background-size:auto,auto,auto,100% 100%}
.map-panel img{position:relative;z-index:2;border-radius:24px;background:rgba(255,255,255,.14);padding:10px;box-shadow:0 20px 55px rgba(15,23,42,.22)}
.speed-line{display:grid;gap:14px;margin:18px 0}
.speed-card{border:1px solid var(--line);border-radius:20px;padding:16px;background:#fff;display:flex;justify-content:space-between;gap:14px;align-items:center}
.speed-card span{color:var(--muted);font-size:14px}.speed-bar{height:8px;flex:1;background:#e8eef8;border-radius:999px;overflow:hidden}.speed-bar i{display:block;height:100%;width:70%;background:#2980FE;border-radius:999px}.speed-card:nth-child(2) .speed-bar i{width:56%}.speed-card:nth-child(3) .speed-bar i{width:82%}
.privacy-protection-section .privacy-panel{background:#fff;border:1px solid var(--line);border-radius:32px;padding:24px;box-shadow:var(--shadow)}
.panel-tags{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0}.panel-tags span{background:#f1f5f9;color:#334155;border-radius:999px;padding:8px 12px;font-size:13px;font-weight:700}
.three-grid{display:grid;gap:16px}.mini-card{border:1px solid var(--line);border-radius:22px;background:#fff;padding:20px}.mini-card h3{margin:0 0 8px;font-size:18px}.mini-card p{margin:0;color:var(--muted)}
.device-grid{display:grid;gap:16px;margin-top:18px}.device-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px}.device-card strong{display:block;color:#111827}.device-card span{color:var(--muted);font-size:14px}
.tech-panel{background:#101d3f;color:#fff;border-radius:32px;padding:24px;box-shadow:var(--shadow)}
.tech-panel p{color:rgba(255,255,255,.75)}.protocol-row{display:grid;gap:12px;margin-top:18px}.protocol-row div{padding:14px;border-radius:18px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.16)}
.process-steps{display:grid;gap:14px;counter-reset:step}.process-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px 22px 22px 70px;box-shadow:0 10px 25px rgba(31,41,55,.04)}
.process-card:before{counter-increment:step;content:counter(step);position:absolute;left:22px;top:22px;width:34px;height:34px;border-radius:12px;display:grid;place-items:center;background:#eaf2ff;color:var(--primary);font-weight:900}.process-card h3{margin:0 0 6px;font-size:18px}.process-card p{margin:0;color:var(--muted)}
.risk-grid{display:grid;gap:16px}.risk-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--primary);border-radius:20px;padding:18px;box-shadow:0 10px 26px rgba(31,41,55,.04)}.risk-card h3{font-size:18px;margin:0 0 8px}.risk-card p{margin:0 0 8px;color:var(--muted)}.risk-card strong{color:#111827}.risk-card a{color:var(--primary);font-weight:750}
.faq-list{display:grid;gap:14px}.faq-item{background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px}.faq-item h3{font-size:18px;margin:0 0 8px}.faq-item p{margin:0;color:var(--muted)}
.cta-section{padding:64px 0;background:var(--gradient);color:#fff;text-align:center;position:relative;overflow:hidden}.cta-section:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 20% 30%,rgba(255,255,255,.24),transparent 26%),radial-gradient(circle at 80% 70%,rgba(255,255,255,.16),transparent 28%)}.cta-section .container{position:relative}.cta-section h2{font-size:30px;margin:0 0 12px}.cta-section p{max-width:700px;margin:0 auto 24px;color:rgba(255,255,255,.86)}
.page-hero{padding:56px 0;background:linear-gradient(180deg,#f5f8ff,#fff)}.page-hero h1{font-size:36px;line-height:1.2;margin:0 0 14px;color:#111827;letter-spacing:-.04em}.page-hero p{max-width:780px;margin:0;color:var(--muted);font-size:17px}
.content-layout{display:grid;gap:22px;align-items:start}.content-card{background:#fff;border:1px solid var(--line);border-radius:26px;padding:24px;box-shadow:0 12px 34px rgba(31,41,55,.05)}.content-card h2{font-size:24px;margin:0 0 12px}.content-card p{color:var(--muted);margin:0 0 14px}.content-card p:last-child{margin-bottom:0}.side-panel{background:#f8fbff;border:1px solid #dbeafe;border-radius:26px;padding:22px;position:relative}.side-panel h2{font-size:20px;margin:0 0 10px}.side-panel p{color:var(--muted);margin:0 0 12px}.side-panel a{display:block;color:var(--primary);font-weight:750;margin-top:8px}
.checklist{display:grid;gap:12px;margin:16px 0}.check-item{padding:14px;border:1px solid var(--line);border-radius:18px;background:#fbfdff}.check-item strong{display:block;color:#111827}.check-item span{color:var(--muted);font-size:14px}
.download-center{max-width:840px;margin:0 auto;text-align:center}.download-center .content-card{text-align:left}.download-steps{display:grid;gap:14px;margin:22px 0}.download-step{display:flex;gap:14px;align-items:flex-start;text-align:left;background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px}.download-step b{display:grid;place-items:center;min-width:34px;height:34px;background:#eaf2ff;color:var(--primary);border-radius:12px}
.site-footer{background:#111827;color:#d1d5db;padding:48px 0 22px}.footer-grid{display:grid;gap:28px}.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;margin-bottom:12px}.footer-brand img{width:38px;height:38px;border-radius:12px;object-fit:cover}.site-footer p{margin:0;color:#9ca3af}.site-footer h3{font-size:16px;color:#fff;margin:0 0 12px}.site-footer a{display:block;color:#cbd5e1;margin:8px 0}.site-footer a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:32px;padding-top:18px;display:flex;flex-direction:column;gap:8px;color:#9ca3af;font-size:14px}
@media (min-width:700px){
  .node-grid{grid-template-columns:repeat(2,1fr)}.three-grid{grid-template-columns:repeat(3,1fr)}.device-grid{grid-template-columns:repeat(3,1fr)}.risk-grid{grid-template-columns:repeat(2,1fr)}.process-steps{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1.4fr 1fr 1fr}.footer-bottom{flex-direction:row;justify-content:space-between}.content-layout{grid-template-columns:minmax(0,1fr) 320px}
}
@media (min-width:980px){
  .nav-toggle-label{display:none}.site-nav{position:static;display:flex!important;flex-direction:row;align-items:center;padding:0;background:transparent;border:0;box-shadow:none}.site-nav a{padding:8px 10px}.hero-grid{grid-template-columns:1.05fr .95fr}.hero-copy h1{font-size:58px}.node-grid{grid-template-columns:repeat(4,1fr)}.split-section{grid-template-columns:1fr 1fr;gap:44px}.split-section.reverse .image-panel{order:2}.section{padding:86px 0}.risk-grid{grid-template-columns:repeat(4,1fr)}.process-steps{grid-template-columns:repeat(3,1fr)}.page-hero h1{font-size:44px}.cta-section h2{font-size:38px}
}
@media (max-width:420px){
  .container{width:min(100% - 24px,1120px)}.hero-copy h1{font-size:34px}.page-hero h1{font-size:32px}.section-title{font-size:27px}.download-btn{width:100%;min-height:52px}.floating-tag{font-size:12px;padding:6px 9px}.tag-2{right:2%;top:6%}.tag-4{right:0}.hero-visual{min-height:280px}.card,.content-card{padding:20px}
}