:root{
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue:#2980FE;
  --blue-hover:#1768E8;
  --text:#1f2937;
  --muted:#667085;
  --light:#f6f8fc;
  --line:#e6eaf2;
  --white:#ffffff;
  --deep:#111827;
  --radius:24px;
  --shadow:0 18px 45px rgba(31,41,55,.08);
}
*{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:1.72;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
p{margin:0 0 14px;color:var(--muted)}
h1,h2,h3{margin:0;color:var(--deep);line-height:1.25}
.container{width:min(1120px,calc(100% - 36px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid rgba(230,234,242,.8)}
.header-inner{width:min(1180px,calc(100% - 28px));margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:72px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:#14213d}
.brand-logo{width:38px;height:38px;border-radius:12px;object-fit:cover;box-shadow:0 8px 24px rgba(41,128,254,.18)}
.brand-name{font-size:20px;letter-spacing:.02em}
.main-nav{display:none;flex-direction:column;gap:8px;position:absolute;top:72px;left:14px;right:14px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:14px;box-shadow:var(--shadow)}
.main-nav.open{display:flex}
.main-nav a{padding:10px 12px;border-radius:12px;color:#475467;font-weight:600;font-size:14px}
.main-nav a:hover,.main-nav a.active{color:var(--blue);background:#eef5ff}
.nav-toggle{appearance:none;border:1px solid var(--line);background:#fff;border-radius:12px;width:42px;height:42px;font-size:22px;color:#1f2937}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 24px;border-radius:999px;background:var(--blue);color:#fff!important;font-weight:800;letter-spacing:.02em;box-shadow:0 12px 30px rgba(41,128,254,.25);transition:.2s ease;border:0;cursor:pointer}
.download-btn:hover{background:var(--blue-hover);transform:translateY(-1px)}
.kicker,.badge{display:inline-flex;align-items:center;gap:6px;border-radius:999px;background:#eef5ff;color:var(--blue);padding:6px 12px;font-weight:800;font-size:13px}
.section{padding:70px 0}
.section-soft{background:var(--light)}
.section-heading{max-width:760px;margin:0 auto 34px;text-align:center}
.section-heading h2{font-size:30px;margin-bottom:12px}
.section-heading p{font-size:16px}
.vpn-network-hero{position:relative;overflow:hidden;background:var(--gradient);color:#fff;padding:74px 0 88px}
.vpn-network-hero:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 20% 25%,rgba(255,255,255,.24),transparent 26%),radial-gradient(circle at 78% 18%,rgba(255,255,255,.2),transparent 22%),linear-gradient(135deg,rgba(255,255,255,.12) 1px,transparent 1px);background-size:auto,auto,44px 44px;opacity:.85}
.vpn-network-hero:after{content:"";position:absolute;right:-90px;bottom:-120px;width:430px;height:430px;border-radius:50%;background:rgba(255,255,255,.14);filter:blur(2px)}
.hero-grid{position:relative;z-index:1;display:grid;gap:34px;align-items:center}
.hero-copy h1{font-size:38px;color:#fff;margin-bottom:16px;letter-spacing:-.03em}
.hero-copy p{color:rgba(255,255,255,.88);font-size:17px;margin-bottom:22px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center;margin-bottom:18px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px}
.hero-tags span,.status-pill{display:inline-flex;border:1px solid rgba(255,255,255,.28);background:rgba(255,255,255,.14);color:#fff;border-radius:999px;padding:8px 12px;font-size:13px;font-weight:700;backdrop-filter:blur(8px)}
.hero-visual{position:relative;min-height:320px;display:flex;align-items:center;justify-content:center}
.device-frame{position:relative;width:min(430px,92%);padding:22px;border-radius:32px;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.28);box-shadow:0 30px 80px rgba(18,22,51,.2);backdrop-filter:blur(12px)}
.device-frame img{border-radius:24px;box-shadow:0 18px 45px rgba(17,24,39,.2)}
.float-tag{position:absolute;background:#fff;color:#26354f;border-radius:999px;padding:9px 13px;font-size:13px;font-weight:800;box-shadow:0 12px 30px rgba(17,24,39,.16)}
.float-tag.t1{top:10px;left:0}.float-tag.t2{right:2px;top:74px}.float-tag.t3{left:18px;bottom:44px}.float-tag.t4{right:8px;bottom:0}
.node-overview{margin-top:-46px;position:relative;z-index:3}
.node-grid{display:grid;gap:16px}
.node-card,.card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 12px 30px rgba(31,41,55,.06)}
.node-card strong{display:block;font-size:18px;margin:8px 0;color:var(--deep)}
.node-card a,.text-link{color:var(--blue);font-weight:800}
.node-label{display:inline-flex;color:var(--blue);background:#eef5ff;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:800}
.split{display:grid;gap:28px;align-items:center}
.split .image-card{padding:16px;background:#fff;border:1px solid var(--line);border-radius:30px;box-shadow:var(--shadow)}
.feature-list{display:grid;gap:12px;margin-top:18px}
.feature-list div{padding:14px 16px;background:#f8fbff;border:1px solid var(--line);border-radius:16px;color:#475467}
.global-nodes-section{position:relative;overflow:hidden;background:#f8fbff}
.map-panel{position:relative;border-radius:32px;background:#fff;border:1px solid var(--line);padding:24px;box-shadow:var(--shadow);overflow:hidden}
.map-panel:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 18% 32%,rgba(41,128,254,.22) 0 5px,transparent 6px),radial-gradient(circle at 68% 24%,rgba(123,78,241,.20) 0 5px,transparent 6px),radial-gradient(circle at 80% 68%,rgba(184,77,218,.18) 0 5px,transparent 6px),linear-gradient(35deg,transparent 48%,rgba(41,128,254,.13) 49%,transparent 50%);opacity:.8}
.map-panel img,.map-panel .map-content{position:relative;z-index:1}
.speed-cards{display:grid;gap:14px;margin-top:18px}
.speed-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:18px;padding:16px;box-shadow:0 10px 26px rgba(31,41,55,.05)}
.privacy-panel{background:#fff;border:1px solid var(--line);border-radius:32px;padding:26px;box-shadow:var(--shadow)}
.security-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.security-tags span{border-radius:999px;background:#eef5ff;color:var(--blue);padding:7px 11px;font-size:13px;font-weight:800}
.info-grid{display:grid;gap:16px}
.info-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 12px 30px rgba(31,41,55,.06)}
.info-card h3{font-size:20px;margin-bottom:8px}
.device-showcase{display:grid;gap:16px}
.device-item{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px;box-shadow:0 10px 26px rgba(31,41,55,.05)}
.device-icon{width:42px;height:42px;display:grid;place-items:center;border-radius:14px;background:#eef5ff;color:var(--blue);font-weight:900}
.tech-panel{background:#111827;color:#fff;border-radius:30px;padding:26px;position:relative;overflow:hidden}
.tech-panel h2,.tech-panel h3{color:#fff}.tech-panel p{color:#cbd5e1}
.tech-panel:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(41,128,254,.25),transparent 45%),radial-gradient(circle at 85% 15%,rgba(184,77,218,.25),transparent 28%);pointer-events:none}
.tech-panel>*{position:relative;z-index:1}
.protocol-grid{display:grid;gap:14px;margin-top:18px}
.protocol-card{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);border-radius:18px;padding:16px}
.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 74px;box-shadow:0 12px 30px rgba(31,41,55,.06)}
.step-card:before{counter-increment:step;content:counter(step);position:absolute;left:22px;top:22px;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--blue);color:#fff;font-weight:900}
.risk-grid{display:grid;gap:16px}
.risk-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:20px;padding:18px;box-shadow:0 10px 26px rgba(31,41,55,.05)}
.risk-card b{display:block;margin-bottom:6px;color:#111827}
.faq-list{display:grid;gap:14px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px;box-shadow:0 10px 26px rgba(31,41,55,.04)}
.faq-item h3{font-size:18px;margin-bottom:8px}
.cta-section{background:var(--gradient);color:#fff;text-align:center;padding:62px 0;position:relative;overflow:hidden}
.cta-section:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 30% 20%,rgba(255,255,255,.22),transparent 30%),radial-gradient(circle at 78% 70%,rgba(255,255,255,.16),transparent 24%)}
.cta-section .container{position:relative;z-index:1}
.cta-section h2{color:#fff;font-size:30px;margin-bottom:12px}.cta-section p{color:rgba(255,255,255,.88);max-width:680px;margin:0 auto 22px}
.page-hero{background:linear-gradient(180deg,#f7faff 0%,#fff 100%);padding:58px 0 28px;border-bottom:1px solid var(--line)}
.page-hero h1{font-size:34px;margin:12px 0}.page-hero p{max-width:760px;font-size:17px}
.page-layout{display:grid;gap:24px;align-items:start;padding:46px 0 74px}
.article-panel{background:#fff;border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:var(--shadow)}
.article-panel h2{font-size:24px;margin:24px 0 12px}.article-panel h2:first-child{margin-top:0}
.article-panel ul,.article-panel ol{padding-left:22px;color:#475467}
.article-panel li{margin:8px 0}
.aside-panel{background:#f8fbff;border:1px solid var(--line);border-radius:24px;padding:20px;position:sticky;top:92px}
.aside-panel h3{font-size:18px;margin-bottom:10px}.aside-panel a{display:block;color:var(--blue);font-weight:800;margin:8px 0}
.checklist{display:grid;gap:12px;margin:18px 0}
.checklist div{background:#f8fbff;border:1px solid var(--line);border-radius:16px;padding:14px}
.notice{background:#eef5ff;border:1px solid #cfe2ff;border-radius:18px;padding:16px;color:#40516c;margin:16px 0}
.download-panel{max-width:840px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:30px;padding:28px;box-shadow:var(--shadow)}
.download-steps{display:grid;gap:14px;margin:24px 0}.download-steps li{background:#f8fbff;border:1px solid var(--line);border-radius:16px;padding:14px;color:#475467}
.site-footer{background:#111827;color:#e5e7eb;padding-top:48px}
.footer-grid{display:grid;gap:26px}.footer-brand{font-size:24px;font-weight:900;margin-bottom:10px}.site-footer p{color:#cbd5e1}.site-footer h3{color:#fff;font-size:16px;margin-bottom:12px}.site-footer a{display:block;color:#cbd5e1;margin:7px 0}.site-footer a:hover{color:#fff}.footer-bottom{text-align:center;border-top:1px solid rgba(255,255,255,.1);margin-top:36px;padding:18px;color:#cbd5e1;font-size:14px}
@media (min-width:680px){
  .node-grid{grid-template-columns:repeat(2,1fr)}
  .info-grid{grid-template-columns:repeat(2,1fr)}
  .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 1fr}
}
@media (min-width:980px){
  .nav-toggle{display:none}.main-nav{display:flex;position:static;flex-direction:row;align-items:center;gap:4px;padding:0;border:0;box-shadow:none;background:transparent}.main-nav a{font-size:14px;padding:9px 10px}
  .hero-grid,.split{grid-template-columns:1.05fr .95fr}.hero-copy h1{font-size:58px}.hero-copy p{font-size:18px}.section-heading h2{font-size:38px}
  .node-grid{grid-template-columns:repeat(4,1fr)}
  .info-grid.three{grid-template-columns:repeat(3,1fr)}
  .risk-grid{grid-template-columns:repeat(4,1fr)}
  .process-steps{grid-template-columns:repeat(3,1fr)}
  .page-layout{grid-template-columns:minmax(0,1fr) 300px}.article-panel{padding:34px}.page-hero h1{font-size:44px}
  .reverse .image-card{order:-1}
}
@media (max-width:480px){
  .container{width:min(100% - 28px,1120px)}.vpn-network-hero{padding:54px 0 74px}.hero-copy h1{font-size:34px}.section{padding:54px 0}.float-tag{position:static;margin:8px 6px 0 0;display:inline-flex}.device-frame{width:100%}.hero-visual{display:block;min-height:0}.page-hero h1{font-size:30px}.download-btn{width:100%;padding:0 18px}.hero-actions .download-btn{width:auto}.article-panel{padding:20px;border-radius:22px}
}