*{box-sizing:border-box}
:root{
  --blue:#2980FE;
  --blue-dark:#1768E8;
  --purple:#7B4EF1;
  --pink:#B84DDA;
  --ink:#1f2937;
  --muted:#5f6b7a;
  --light:#f6f8fc;
  --line:#e6ebf3;
  --card:#ffffff;
  --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
  --radius:24px;
  --shadow:0 18px 48px rgba(37,61,125,.12);
}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
  color:var(--ink);
  background:#fff;
  line-height:1.72;
  font-size:16px;
}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-dark)}
.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 rgba(230,235,243,.85);backdrop-filter:blur(16px)
}
.header-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;letter-spacing:.2px}
.brand img{width:38px;height:38px;border-radius:12px;object-fit:cover}
.site-nav{display:none;position:absolute;left:16px;right:16px;top:68px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}
.site-nav a{display:block;color:#374151;padding:10px 12px;border-radius:12px;font-weight:650}
.site-nav a.active,.site-nav a:hover{background:#eef5ff;color:var(--blue)}
.nav-toggle{position:absolute;opacity:0;pointer-events:none}
.nav-toggle:checked~.site-nav{display:block}
.menu-button{width:42px;height:42px;border:1px solid var(--line);border-radius:13px;display:grid;place-content:center;gap:5px;background:#fff}
.menu-button span{display:block;width:19px;height:2px;border-radius:2px;background:#263445}
.download-btn{
  display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:13px 26px;
  border-radius:999px;background:var(--blue);color:#fff!important;font-weight:800;
  box-shadow:0 12px 26px rgba(41,128,254,.24);transition:transform .2s ease,background .2s ease,box-shadow .2s ease
}
.download-btn:hover{background:var(--blue-dark);transform:translateY(-2px);box-shadow:0 16px 32px rgba(23,104,232,.28)}
.section{padding:64px 0}
.section-light{background:var(--light)}
.section-head{max-width:760px;margin:0 auto 28px;text-align:center}
.section-head .eyebrow,.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:5px 12px;border-radius:999px;background:#eef5ff;color:var(--blue);font-weight:800;font-size:13px}
.section-head h2,.content-block h2{font-size:30px;line-height:1.25;margin:14px 0 12px}
.section-head p,.content-block p,.plain-page p{color:var(--muted)}
.vpn-network-hero{
  position:relative;overflow:hidden;color:#fff;background:var(--gradient);padding:72px 0 46px
}
.vpn-network-hero:before,.vpn-network-hero:after{
  content:"";position:absolute;inset:auto;border-radius:999px;filter:blur(4px);opacity:.45;pointer-events:none
}
.vpn-network-hero:before{width:420px;height:420px;right:-130px;top:-120px;background:rgba(255,255,255,.22)}
.vpn-network-hero:after{width:280px;height:280px;left:-90px;bottom:-80px;background:rgba(152,201,255,.22)}
.hero-grid{position:relative;display:grid;gap:34px;align-items:center}
.hero-copy h1{font-size:38px;line-height:1.14;margin:14px 0 16px;letter-spacing:-.8px}
.hero-copy p{font-size:17px;color:rgba(255,255,255,.9);margin:0 0 24px}
.hero-tags,.floating-tags,.tag-row{display:flex;gap:10px;flex-wrap:wrap}
.hero-tags span,.floating-tags span,.tag-row span{
  display:inline-flex;padding:7px 12px;border-radius:999px;background:rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.24);font-size:13px;font-weight:750;color:#fff
}
.hero-visual{position:relative;padding:18px;border-radius:32px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);box-shadow:0 28px 80px rgba(16,24,40,.22)}
.hero-visual img{border-radius:25px;margin:auto;max-height:410px;object-fit:contain}
.status-card{
  position:absolute;right:10px;bottom:10px;padding:12px 14px;border-radius:18px;background:rgba(255,255,255,.94);
  color:#213044;box-shadow:0 16px 40px rgba(31,41,55,.2);font-weight:800;font-size:14px
}
.status-card small{display:block;color:var(--muted);font-weight:600}
.node-lines{
  position:absolute;inset:0;opacity:.28;background:
  radial-gradient(circle at 20% 35%,#fff 0 2px,transparent 3px),
  radial-gradient(circle at 72% 22%,#fff 0 2px,transparent 3px),
  radial-gradient(circle at 62% 78%,#fff 0 2px,transparent 3px),
  radial-gradient(circle at 38% 70%,#fff 0 2px,transparent 3px);
}
.node-lines:before{
  content:"";position:absolute;left:18%;right:16%;top:34%;height:1px;background:rgba(255,255,255,.75);
  transform:rotate(13deg);box-shadow:0 88px 0 rgba(255,255,255,.55),120px -30px 0 rgba(255,255,255,.35)
}
.node-overview{margin-top:-34px;position:relative;z-index:4}
.node-overview-grid{display:grid;gap:16px}
.node-card,.feature-card,.risk-card,.faq-item,.step-card,.policy-card,.info-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 30px rgba(37,61,125,.06)
}
.node-card{padding:22px}
.node-card strong{display:inline-block;color:var(--blue);font-size:13px;margin-bottom:8px}
.node-card h3,.feature-card h3,.risk-card h3,.step-card h3,.policy-card h3{margin:0 0 8px;font-size:20px}
.node-card p,.feature-card p,.risk-card p,.step-card p,.policy-card p,.info-card p{color:var(--muted);margin:0 0 12px}
.link-more{font-weight:800;color:var(--blue)}
.split-section{display:grid;gap:28px;align-items:center}
.visual-card{border-radius:32px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);padding:18px;position:relative;overflow:hidden}
.visual-card img{border-radius:24px;margin:auto;max-height:390px;object-fit:contain}
.feature-list{display:grid;gap:12px;margin:18px 0}
.feature-list div{padding:14px 16px;border-left:4px solid var(--blue);background:#f8fbff;border-radius:14px;color:#445064}
.global-nodes-section{position:relative;overflow:hidden;background:#f8fbff}
.map-panel{position:relative;border-radius:32px;padding:24px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);overflow:hidden}
.map-panel:before{
  content:"";position:absolute;inset:0;background:
  radial-gradient(circle at 18% 30%,rgba(41,128,254,.22) 0 5px,transparent 6px),
  radial-gradient(circle at 62% 25%,rgba(123,78,241,.2) 0 5px,transparent 6px),
  radial-gradient(circle at 74% 68%,rgba(184,77,218,.18) 0 5px,transparent 6px),
  linear-gradient(120deg,transparent 10%,rgba(41,128,254,.12) 11%,transparent 12%,transparent 60%,rgba(123,78,241,.12) 61%,transparent 62%);
}
.map-panel>*{position:relative}
.speed-lines{display:grid;gap:12px;margin-top:18px}
.speed-line{height:44px;border-radius:999px;background:#fff;border:1px solid var(--line);padding:7px}
.speed-line span{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,#dfeaff,#2980FE)}
.speed-line:nth-child(2) span{width:78%}
.speed-line:nth-child(3) span{width:60%}
.privacy-panel,.protocol-panel{
  background:#fff;border:1px solid var(--line);border-radius:32px;padding:24px;box-shadow:var(--shadow)
}
.privacy-grid,.policy-grid,.device-grid,.protocol-grid,.risk-grid,.faq-grid,.related-grid,.check-grid{display:grid;gap:16px}
.privacy-chip,.protocol-chip{padding:14px;border-radius:18px;background:#f8fbff;border:1px solid var(--line)}
.policy-card,.feature-card,.risk-card,.step-card,.info-card{padding:22px}
.device-card{background:#fff;border:1px solid var(--line);border-radius:26px;padding:22px;display:flex;gap:14px;align-items:flex-start}
.device-card span{width:42px;height:42px;border-radius:16px;display:grid;place-items:center;background:#eef5ff;color:var(--blue);font-weight:900;flex:0 0 auto}
.process-steps{display:grid;gap:14px}
.step-card{position:relative;padding-left:70px}
.step-num{position:absolute;left:18px;top:22px;width:36px;height:36px;border-radius:14px;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:900}
.risk-card{border-top:4px solid var(--blue)}
.risk-card strong{display:block;color:#334155;margin-top:8px}
.faq-item{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 .container{max-width:760px}
.cta-section p{color:rgba(255,255,255,.88)}
.cta-section .download-btn{background:var(--blue)}
.page-hero{padding:58px 0;background:linear-gradient(180deg,#f5f8ff 0%,#fff 100%);border-bottom:1px solid var(--line)}
.page-hero-inner{max-width:840px}
.page-hero h1{font-size:34px;line-height:1.18;margin:14px 0}
.page-hero p{font-size:17px;color:var(--muted);margin:0}
.category-badge{display:inline-flex;align-items:center;padding:6px 13px;border-radius:999px;background:#eef5ff;color:var(--blue);font-weight:900;font-size:13px}
.plain-page{padding:52px 0}
.page-layout{display:grid;gap:26px}
.article-card{background:#fff;border:1px solid var(--line);border-radius:30px;padding:24px;box-shadow:0 16px 38px rgba(37,61,125,.07)}
.article-card h2{font-size:25px;line-height:1.3;margin:0 0 14px}
.article-card h3{font-size:20px;margin:24px 0 10px}
.article-card ul,.article-card ol{padding-left:22px;color:var(--muted)}
.aside-card{background:#f8fbff;border:1px solid var(--line);border-radius:26px;padding:22px;align-self:start}
.aside-card h3{margin-top:0}
.aside-card a{display:block;padding:9px 0;font-weight:750}
.notice-box{background:#f8fbff;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:18px;padding:16px;margin:18px 0;color:#405066}
.download-center{max-width:900px;margin:auto;text-align:center}
.steps-list{counter-reset:item;display:grid;gap:14px;margin:28px 0;text-align:left}
.steps-list li{list-style:none;counter-increment:item;background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px 16px 16px 58px;position:relative;color:var(--muted)}
.steps-list li:before{content:counter(item);position:absolute;left:16px;top:16px;width:28px;height:28px;border-radius:10px;background:var(--blue);color:#fff;font-weight:900;display:grid;place-items:center}
.site-footer{background:#111827;color:#d9e0ea;padding:46px 0 22px}
.footer-grid{display:grid;gap:26px}
.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:#aeb8c6}
.site-footer h3{font-size:16px;color:#fff;margin:0 0 10px}
.site-footer a{display:block;color:#c9d4e4;margin:7px 0}
.footer-bottom{display:flex;flex-direction:column;gap:8px;border-top:1px solid rgba(255,255,255,.1);margin-top:30px;padding-top:18px;color:#9ca8ba;font-size:14px}

@media (min-width:700px){
  .node-overview-grid{grid-template-columns:repeat(2,1fr)}
  .privacy-grid,.policy-grid,.device-grid,.protocol-grid,.risk-grid,.related-grid,.check-grid{grid-template-columns:repeat(2,1fr)}
  .faq-grid{grid-template-columns:repeat(2,1fr)}
  .process-steps{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:960px){
  .menu-button{display:none}
  .site-nav{display:flex;position:static;padding:0;background:transparent;border:0;border-radius:0;box-shadow:none;align-items:center;gap:2px}
  .site-nav a{padding:8px 10px;font-size:14px}
  .hero-grid{grid-template-columns:1.03fr .97fr}
  .hero-copy h1{font-size:56px}
  .node-overview-grid{grid-template-columns:repeat(4,1fr)}
  .split-section{grid-template-columns:1fr 1fr}
  .split-section.reverse .visual-card{order:2}
  .privacy-grid,.protocol-grid{grid-template-columns:repeat(3,1fr)}
  .policy-grid,.risk-grid{grid-template-columns:repeat(3,1fr)}
  .device-grid{grid-template-columns:repeat(3,1fr)}
  .process-steps{grid-template-columns:repeat(3,1fr)}
  .page-layout{grid-template-columns:minmax(0,1fr) 300px}
  .footer-grid{grid-template-columns:1.4fr .8fr .8fr .8fr}
  .footer-bottom{flex-direction:row;justify-content:space-between}
}
@media (max-width:420px){
  .container{width:min(100% - 24px,1120px)}
  .hero-copy h1,.page-hero h1{font-size:32px}
  .section{padding:48px 0}
  .article-card{padding:20px;border-radius:24px}
  .download-btn{width:100%}
}