:root{
  --primary:#2980FE;
  --primary-hover:#1768E8;
  --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
  --text:#20283A;
  --muted:#647084;
  --soft:#F5F7FB;
  --soft-blue:#F0F5FF;
  --line:#E6EBF3;
  --white:#FFFFFF;
  --shadow:0 18px 45px rgba(33,55,105,.12);
  --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:1.7;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
p{margin:0 0 14px}
h1,h2,h3{line-height:1.25;margin:0;color:#17213A}
h1{font-size:34px;letter-spacing:-.4px}
h2{font-size:28px;margin-bottom:16px}
h3{font-size:19px;margin-bottom:10px}
.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);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(16px);
}
.header-inner{
  width:min(1180px,calc(100% - 24px));
  margin:0 auto;
  min-height:68px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:#17213A}
.logo img{width:38px;height:38px;border-radius:12px;object-fit:cover}
.nav-toggle{
  border:1px solid var(--line);
  background:#fff;
  color:#24304A;
  border-radius:12px;
  padding:9px 12px;
  font-weight:700;
}
.main-nav{
  display:none;
  position:absolute;
  left:12px;
  right:12px;
  top:68px;
  padding:12px;
  border:1px solid var(--line);
  border-radius:18px;
  background:#fff;
  box-shadow:var(--shadow);
}
.main-nav.open{display:grid;gap:6px}
.main-nav a{
  padding:10px 12px;
  border-radius:12px;
  color:#526075;
  font-weight:700;
  font-size:14px;
}
.main-nav a.active,.main-nav a:hover{background:var(--soft-blue);color:var(--primary)}
.download-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:13px 24px;
  border-radius:999px;
  background:var(--primary);
  color:#fff;
  font-weight:800;
  box-shadow:0 14px 24px rgba(41,128,254,.25);
  transition:.2s ease;
}
.download-btn:hover{background:var(--primary-hover);transform:translateY(-1px)}
.section{padding:64px 0}
.section-soft{background:var(--soft)}
.section-title{max-width:760px;margin:0 auto 28px;text-align:center}
.section-title p{color:var(--muted);font-size:16px}
.text-link{color:var(--primary);font-weight:800}
.badge,.category-badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 12px;
  border-radius:999px;
  background:rgba(41,128,254,.1);
  color:var(--primary);
  font-size:13px;
  font-weight:800;
}
.vpn-network-hero{
  position:relative;
  color:#fff;
  overflow:hidden;
  background:var(--gradient);
}
.vpn-network-hero:before{
  content:"";
  position:absolute;
  inset:0;
  background:
    radial-gradient(circle at 18% 20%,rgba(255,255,255,.2),transparent 26%),
    radial-gradient(circle at 80% 15%,rgba(255,255,255,.18),transparent 30%),
    linear-gradient(135deg,rgba(255,255,255,.16) 1px,transparent 1px);
  background-size:auto,auto,42px 42px;
  opacity:.78;
}
.hero-inner{
  position:relative;
  z-index:1;
  width:min(1180px,calc(100% - 32px));
  margin:0 auto;
  padding:72px 0 70px;
  display:grid;
  gap:34px;
}
.hero-copy h1{color:#fff;font-size:40px;margin:18px 0 16px}
.hero-copy p{color:rgba(255,255,255,.9);font-size:17px;max-width:650px}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin:26px 0}
.hero-tags,.status-tags,.mini-tags{display:flex;flex-wrap:wrap;gap:10px}
.hero-tags span,.status-tags span,.mini-tags span{
  display:inline-flex;
  align-items:center;
  border:1px solid rgba(255,255,255,.26);
  background:rgba(255,255,255,.14);
  color:#fff;
  border-radius:999px;
  padding:7px 12px;
  font-size:13px;
  font-weight:700;
}
.hero-visual{
  position:relative;
  min-height:330px;
  display:flex;
  align-items:center;
  justify-content:center;
}
.hero-device{
  position:relative;
  z-index:2;
  width:min(440px,92%);
  padding:18px;
  border-radius:32px;
  background:rgba(255,255,255,.17);
  box-shadow:0 30px 80px rgba(22,22,70,.24);
  backdrop-filter:blur(12px);
}
.hero-device img{border-radius:24px;margin:auto}
.float-card{
  position:absolute;
  z-index:3;
  border-radius:16px;
  padding:10px 13px;
  background:rgba(255,255,255,.92);
  color:#24304A;
  box-shadow:0 14px 35px rgba(20,30,80,.18);
  font-size:13px;
  font-weight:800;
}
.float-card.one{top:24px;left:4px}
.float-card.two{top:62px;right:0}
.float-card.three{bottom:68px;left:0}
.float-card.four{bottom:22px;right:16px}
.node-overview{
  margin-top:-36px;
  position:relative;
  z-index:3;
}
.node-overview-grid{
  display:grid;
  gap:16px;
}
.node-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:22px;
  padding:22px;
  box-shadow:0 16px 40px rgba(30,55,100,.08);
}
.node-card .badge{margin-bottom:12px}
.node-card p{color:var(--muted)}
.split-section{
  display:grid;
  gap:26px;
  align-items:center;
}
.content-panel{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:26px;
  box-shadow:var(--shadow);
}
.content-panel p,.feature-copy p,.page-summary{color:var(--muted)}
.feature-list,.check-list{
  list-style:none;
  padding:0;
  margin:18px 0;
  display:grid;
  gap:10px;
}
.feature-list li,.check-list li{
  position:relative;
  padding-left:28px;
  color:#34415A;
}
.feature-list li:before,.check-list li:before{
  content:"";
  width:10px;
  height:10px;
  border-radius:50%;
  background:var(--primary);
  position:absolute;
  left:4px;
  top:.65em;
  box-shadow:0 0 0 5px rgba(41,128,254,.12);
}
.image-card{
  border-radius:30px;
  background:#fff;
  border:1px solid var(--line);
  padding:18px;
  box-shadow:var(--shadow);
}
.image-card img{border-radius:22px;margin:auto}
.global-nodes-section{
  position:relative;
  overflow:hidden;
  background:
    radial-gradient(circle at 20% 22%,rgba(41,128,254,.14),transparent 30%),
    radial-gradient(circle at 80% 70%,rgba(123,78,241,.14),transparent 28%),
    #fff;
}
.global-map{
  border:1px solid var(--line);
  border-radius:30px;
  padding:24px;
  background:
    linear-gradient(135deg,rgba(41,128,254,.08) 1px,transparent 1px),
    #fff;
  background-size:34px 34px;
  box-shadow:var(--shadow);
}
.node-mini-grid{
  display:grid;
  gap:12px;
  margin-top:18px;
}
.node-mini-grid div,.speed-card,.policy-card,.risk-item,.faq-item,.related-card,.protocol-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:20px;
  padding:18px;
}
.node-mini-grid strong,.speed-card strong,.policy-card strong,.risk-item strong{display:block;margin-bottom:6px;color:#17213A}
.node-mini-grid span,.speed-card span,.policy-card span,.risk-item span{color:var(--muted);font-size:14px}
.high-speed-section{background:linear-gradient(180deg,#F6F9FF 0%,#fff 100%)}
.speed-grid{
  display:grid;
  gap:14px;
  margin-top:20px;
}
.speed-card{border-left:4px solid var(--primary)}
.privacy-protection-section .privacy-board{
  display:grid;
  gap:16px;
}
.security-panel{
  background:#17213A;
  color:#fff;
  border-radius:28px;
  padding:26px;
  overflow:hidden;
  position:relative;
}
.security-panel:before{
  content:"";
  position:absolute;
  inset:auto -50px -70px auto;
  width:190px;
  height:190px;
  border-radius:50%;
  background:rgba(41,128,254,.25);
}
.security-panel h3{color:#fff}
.security-panel p{color:rgba(255,255,255,.78)}
.security-panel img{position:relative;z-index:1;border-radius:20px;margin-top:18px}
.no-log-policy-section .policy-grid,.protocol-grid,.risk-grid,.faq-grid,.related-grid{
  display:grid;
  gap:16px;
}
.policy-card,.protocol-card{box-shadow:0 10px 28px rgba(30,55,100,.06)}
.multi-device-section{background:#fff}
.device-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:14px;
  margin-top:18px;
}
.device-card{
  padding:18px;
  border-radius:22px;
  background:var(--soft);
  border:1px solid var(--line);
}
.encryption-protocol-section{background:#F7F9FD}
.tech-panel{
  border-radius:30px;
  padding:24px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:var(--shadow);
}
.protocol-card{border-top:4px solid var(--primary)}
.process-steps{
  display:grid;
  gap:16px;
  counter-reset:step;
}
.step-card{
  position:relative;
  background:#fff;
  border:1px solid var(--line);
  border-radius:22px;
  padding:22px 22px 22px 76px;
}
.step-card:before{
  counter-increment:step;
  content:counter(step);
  position:absolute;
  left:22px;
  top:22px;
  width:38px;
  height:38px;
  border-radius:14px;
  display:grid;
  place-items:center;
  background:var(--primary);
  color:#fff;
  font-weight:900;
}
.step-card p{color:var(--muted)}
.risk-item{border-left:4px solid var(--primary)}
.risk-item p{color:var(--muted)}
.faq-item h3{font-size:17px}
.faq-item p{color:var(--muted)}
.cta-section{
  background:var(--gradient);
  color:#fff;
  text-align:center;
  padding:66px 0;
  position:relative;
  overflow:hidden;
}
.cta-section:before{
  content:"";
  position:absolute;
  inset:0;
  background:radial-gradient(circle at 50% 0,rgba(255,255,255,.22),transparent 34%);
}
.cta-section .container{position:relative;z-index:1}
.cta-section h2{color:#fff}
.cta-section p{max-width:720px;margin:0 auto 24px;color:rgba(255,255,255,.88)}
.page-hero{
  padding:54px 0 38px;
  background:linear-gradient(180deg,#F5F8FF 0%,#fff 100%);
}
.page-hero .container{max-width:920px}
.page-hero h1{margin:14px 0;font-size:36px}
.page-hero p{color:var(--muted);font-size:17px}
.page-layout{
  width:min(1120px,calc(100% - 32px));
  margin:0 auto;
  padding:40px 0 70px;
  display:grid;
  gap:24px;
}
.article-body{
  background:#fff;
  border:1px solid var(--line);
  border-radius:28px;
  padding:26px;
  box-shadow:0 16px 40px rgba(30,55,100,.06);
}
.article-body h2{font-size:24px;margin-top:28px}
.article-body p{color:#4E5B70}
.info-box,.tip-box{
  border-radius:22px;
  padding:20px;
  background:var(--soft-blue);
  border:1px solid #DDE9FF;
  margin:22px 0;
}
.tip-box{background:#FAFBFD;border-color:var(--line)}
.sidebar{
  display:grid;
  gap:16px;
  align-content:start;
}
.sidebar-card{
  border-radius:24px;
  border:1px solid var(--line);
  background:#fff;
  padding:20px;
  box-shadow:0 12px 30px rgba(30,55,100,.06);
}
.sidebar-card a{
  display:block;
  color:var(--primary);
  font-weight:800;
  margin-top:9px;
}
.download-page-card{
  max-width:860px;
  margin:0 auto;
  text-align:center;
}
.download-steps{
  display:grid;
  gap:14px;
  margin:28px 0;
  text-align:left;
}
.download-step{
  display:flex;
  gap:14px;
  align-items:flex-start;
  padding:18px;
  border:1px solid var(--line);
  border-radius:20px;
  background:#fff;
}
.download-step span{
  flex:0 0 36px;
  width:36px;
  height:36px;
  border-radius:13px;
  display:grid;
  place-items:center;
  background:var(--primary);
  color:#fff;
  font-weight:900;
}
.site-footer{
  background:#F5F7FB;
  border-top:1px solid var(--line);
  padding:44px 0 0;
}
.footer-grid{
  display:grid;
  gap:24px;
}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.footer-brand img{width:38px;height:38px;border-radius:12px;object-fit:cover}
.site-footer p{color:var(--muted)}
.site-footer h3{font-size:16px}
.site-footer a{
  display:block;
  color:#5B667A;
  margin:7px 0;
}
.site-footer a:hover{color:var(--primary)}
.footer-bottom{
  border-top:1px solid var(--line);
  margin-top:30px;
  padding:18px 16px;
  text-align:center;
  color:var(--muted);
}
@media (min-width:680px){
  h1{font-size:42px}
  .node-overview-grid{grid-template-columns:repeat(2,1fr)}
  .risk-grid,.faq-grid,.related-grid,.policy-grid,.protocol-grid,.speed-grid{grid-template-columns:repeat(2,1fr)}
  .process-steps{grid-template-columns:repeat(2,1fr)}
  .download-steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1.2fr 1fr 1fr 1fr}
}
@media (min-width:960px){
  .nav-toggle{display:none}
  .main-nav{
    position:static;
    display:flex;
    align-items:center;
    justify-content:flex-end;
    gap:2px;
    padding:0;
    border:0;
    border-radius:0;
    background:transparent;
    box-shadow:none;
  }
  .main-nav a{font-size:14px}
  .hero-inner{grid-template-columns:1.04fr .96fr;align-items:center;min-height:620px}
  .hero-copy h1{font-size:56px}
  .node-overview-grid{grid-template-columns:repeat(4,1fr)}
  .split-section{grid-template-columns:1fr 1fr;gap:40px}
  .split-section.reverse .feature-copy{order:2}
  .split-section.reverse .image-card{order:1}
  .privacy-protection-section .privacy-board{grid-template-columns:1fr .9fr;align-items:center}
  .policy-grid,.protocol-grid{grid-template-columns:repeat(3,1fr)}
  .risk-grid{grid-template-columns:repeat(3,1fr)}
  .page-layout{grid-template-columns:minmax(0,1fr) 310px;align-items:start}
  .article-body{padding:34px}
  .device-grid{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:420px){
  .container,.page-layout,.hero-inner{width:min(100% - 24px,1120px)}
  h1,.hero-copy h1{font-size:32px}
  h2{font-size:24px}
  .section{padding:48px 0}
  .float-card{position:static;margin:8px;display:inline-flex}
  .hero-visual{display:block;min-height:auto;text-align:center}
  .hero-device{margin:18px auto}
  .step-card{padding-left:68px}
}