*{box-sizing:border-box}
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:#202838;background:#f6f8fc;line-height:1.72;overflow-x:hidden}
a{color:#256fe8;text-decoration:none}
a:hover{color:#1768E8}
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(16px);border-bottom:1px solid #e8edf6}
.nav-wrap{width:min(1180px,calc(100% - 28px));margin:0 auto;min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:22px;color:#17213a}
.brand img{width:42px;height:42px;border-radius:12px;object-fit:cover;border:1px solid #e8edf6}
.site-nav{display:none;position:absolute;left:14px;right:14px;top:72px;padding:14px;background:#fff;border:1px solid #e8edf6;border-radius:22px;box-shadow:0 18px 40px rgba(34,48,74,.12)}
.site-nav a{display:block;padding:12px 14px;border-radius:14px;color:#3f4a5f;font-size:15px;font-weight:600}
.site-nav a.active,.site-nav a:hover{background:#eef5ff;color:#1768E8}
.nav-toggle{position:absolute;opacity:0;pointer-events:none}
.nav-toggle-btn{width:44px;height:44px;border:1px solid #dde6f3;border-radius:14px;display:flex;flex-direction:column;justify-content:center;gap:5px;padding:0 11px;background:#fff;cursor:pointer}
.nav-toggle-btn span{height:2px;background:#1f2a44;border-radius:2px}
.nav-toggle:checked~.site-nav{display:block}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 24px;border-radius:999px;background:#2980FE;color:#fff!important;font-weight:800;letter-spacing:.02em;box-shadow:0 14px 24px rgba(41,128,254,.24);transition:transform .2s ease,background .2s ease,box-shadow .2s ease;white-space:nowrap}
.download-btn:hover{background:#1768E8;color:#fff!important;transform:translateY(-2px);box-shadow:0 16px 28px rgba(23,104,232,.28)}
.section{padding:64px 0}
.section-soft{background:#eef4fb}
.section-title{font-size:30px;line-height:1.22;margin:0 0 14px;color:#17213a;letter-spacing:-.02em}
.section-desc{margin:0;color:#647086;font-size:16px}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:999px;background:#eaf3ff;color:#1768E8;font-size:13px;font-weight:800;margin-bottom:14px}
.gradient-bg{background:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%)}
.vpn-network-hero{position:relative;overflow:hidden;color:#fff;padding:72px 0 56px}
.vpn-network-hero:before{content:"";position:absolute;inset:0;background:
radial-gradient(circle at 15% 20%,rgba(255,255,255,.26),transparent 18%),
radial-gradient(circle at 78% 20%,rgba(255,255,255,.20),transparent 16%),
linear-gradient(135deg,rgba(255,255,255,.16) 1px,transparent 1px);background-size:auto,auto,46px 46px;opacity:.75}
.vpn-network-hero:after{content:"";position:absolute;width:620px;height:620px;border:1px solid rgba(255,255,255,.22);border-radius:50%;right:-210px;top:-180px}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1fr;gap:34px;align-items:center}
.hero-content h1{font-size:40px;line-height:1.1;margin:0 0 18px;letter-spacing:-.04em}
.hero-content p{font-size:17px;color:rgba(255,255,255,.86);margin:0 0 22px;max-width:650px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 0}
.hero-tags span{padding:8px 12px;border:1px solid rgba(255,255,255,.25);border-radius:999px;background:rgba(255,255,255,.13);font-size:13px;color:#fff}
.hero-visual{position:relative;min-height:320px;padding:20px}
.hero-visual .visual-card{position:relative;margin:auto;max-width:420px;padding:18px;border-radius:32px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.23);box-shadow:0 30px 70px rgba(17,28,75,.25);backdrop-filter:blur(14px)}
.hero-visual img{border-radius:24px;margin:auto}
.status-chip{position:absolute;padding:10px 14px;border-radius:16px;background:#fff;color:#1f2a44;box-shadow:0 18px 35px rgba(32,40,56,.16);font-weight:800;font-size:13px;border:1px solid #e9edf5}
.status-chip.one{left:0;top:36px}
.status-chip.two{right:4px;top:92px}
.status-chip.three{left:8px;bottom:54px}
.status-chip.four{right:18px;bottom:16px}
.node-overview{margin-top:-26px;position:relative;z-index:3}
.node-grid{display:grid;grid-template-columns:1fr;gap:16px}
.node-card{background:#fff;border:1px solid #e5eaf3;border-radius:24px;padding:22px;box-shadow:0 16px 38px rgba(34,48,74,.08)}
.node-card .label{display:inline-flex;margin-bottom:12px;padding:4px 10px;border-radius:999px;background:#eef5ff;color:#2980FE;font-weight:800;font-size:12px}
.node-card h3{margin:0 0 8px;font-size:19px;color:#17213a}
.node-card p{margin:0 0 12px;color:#667287;font-size:15px}
.node-card a{font-weight:800}
.split-section{display:grid;grid-template-columns:1fr;gap:28px;align-items:center}
.media-panel{background:#fff;border:1px solid #e6ebf4;border-radius:30px;padding:18px;box-shadow:0 20px 48px rgba(34,48,74,.08)}
.media-panel img{border-radius:24px;margin:auto}
.feature-list{display:grid;gap:12px;margin:22px 0}
.feature-list .item{padding:14px 16px;border-left:4px solid #2980FE;background:#fff;border-radius:14px;border-top:1px solid #e9edf5;border-right:1px solid #e9edf5;border-bottom:1px solid #e9edf5;color:#4d5b72}
.related-link{font-weight:800}
.vpn-connection-section{background:#fff}
.global-nodes-section{position:relative;overflow:hidden}
.global-nodes-section .map-panel{position:relative;padding:28px;border-radius:32px;background:linear-gradient(135deg,#ffffff,#eef5ff);border:1px solid #dfe8f6;overflow:hidden}
.map-panel:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 20% 30%,#2980FE 0 3px,transparent 4px),radial-gradient(circle at 68% 50%,#7B4EF1 0 4px,transparent 5px),radial-gradient(circle at 82% 28%,#B84DDA 0 3px,transparent 4px),linear-gradient(115deg,transparent 0 35%,rgba(41,128,254,.12) 36% 37%,transparent 38%);background-size:100% 100%;opacity:.78}
.map-panel>*{position:relative}
.network-card{background:#fff;border:1px solid #e5eaf3;border-radius:24px;padding:20px;box-shadow:0 16px 38px rgba(34,48,74,.08)}
.high-speed-section{background:#eef4fb}
.speed-lines{display:grid;gap:12px;margin-top:20px}
.speed-line{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;background:#fff;border:1px solid #e4ebf5;border-radius:18px;color:#4b5970}
.speed-line span:last-child{font-weight:800;color:#2980FE}
.privacy-protection-section .privacy-panel{background:#fff;border:1px solid #e5eaf3;border-radius:30px;padding:26px;box-shadow:0 18px 46px rgba(34,48,74,.08)}
.privacy-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.privacy-tags span{background:#eef5ff;color:#1768E8;padding:8px 12px;border-radius:999px;font-size:13px;font-weight:800}
.no-log-policy-section{background:#fff}
.info-grid{display:grid;grid-template-columns:1fr;gap:16px;margin-top:26px}
.info-card{background:#fff;border:1px solid #e5eaf3;border-radius:24px;padding:22px;box-shadow:0 14px 34px rgba(34,48,74,.06)}
.info-card h3{margin:0 0 10px;color:#17213a}
.info-card p{margin:0;color:#647086}
.multi-device-section{background:#f8fbff}
.device-grid{display:grid;grid-template-columns:1fr;gap:16px;margin-top:22px}
.device-card{padding:18px;border-radius:22px;background:#fff;border:1px solid #e5eaf3}
.encryption-protocol-section{background:#fff}
.tech-panel{display:grid;grid-template-columns:1fr;gap:16px;background:#17213a;color:#fff;border-radius:32px;padding:24px;overflow:hidden;position:relative}
.tech-panel:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 82% 12%,rgba(41,128,254,.36),transparent 24%)}
.tech-panel>*{position:relative}
.tech-panel .protocol-card{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);border-radius:22px;padding:18px}
.tech-panel p{color:rgba(255,255,255,.76);margin:0}
.process-steps{display:grid;grid-template-columns:1fr;gap:14px;margin-top:26px}
.step-card{position:relative;background:#fff;border:1px solid #e5eaf3;border-radius:22px;padding:20px;box-shadow:0 12px 30px rgba(34,48,74,.06)}
.step-number{display:inline-flex;width:32px;height:32px;border-radius:50%;align-items:center;justify-content:center;background:#2980FE;color:#fff;font-weight:900;margin-bottom:10px}
.step-card h3{margin:0 0 8px;color:#17213a}
.step-card p{margin:0 0 10px;color:#647086}
.risk-grid{display:grid;grid-template-columns:1fr;gap:16px;margin-top:26px}
.risk-card{background:#fff;border:1px solid #e5eaf3;border-left:4px solid #2980FE;border-radius:22px;padding:18px}
.risk-card h3{margin:0 0 8px;color:#17213a}
.risk-card p{margin:0 0 8px;color:#647086}
.risk-card strong{color:#26344d}
.faq-list{display:grid;gap:14px;margin-top:24px}
.faq-item{background:#fff;border:1px solid #e5eaf3;border-radius:22px;padding:20px}
.faq-item h3{margin:0 0 8px;color:#17213a;font-size:18px}
.faq-item p{margin:0;color:#647086}
.cta-section{padding:58px 0;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 20%),radial-gradient(circle at 80% 20%,rgba(255,255,255,.18),transparent 18%)}
.cta-section .container{position:relative}
.cta-section h2{font-size:30px;line-height:1.25;margin:0 0 12px}
.cta-section p{margin:0 auto 22px;max-width:680px;color:rgba(255,255,255,.84)}
.page-hero{padding:58px 0 36px;background:linear-gradient(180deg,#f7faff,#eef4fb)}
.page-hero .container{display:grid;gap:16px}
.page-hero h1{font-size:34px;line-height:1.18;margin:0;color:#17213a;letter-spacing:-.03em}
.page-hero p{margin:0;max-width:760px;color:#647086}
.content-layout{display:grid;grid-template-columns:1fr;gap:24px;align-items:start;padding:40px 0 66px}
.article-panel{background:#fff;border:1px solid #e5eaf3;border-radius:28px;padding:24px;box-shadow:0 16px 38px rgba(34,48,74,.06)}
.article-panel h2{color:#17213a;margin:24px 0 10px;font-size:24px}
.article-panel h2:first-child{margin-top:0}
.article-panel p{color:#4d5b72;margin:0 0 16px}
.check-list{display:grid;gap:12px;margin:18px 0}
.check-list li{list-style:none;background:#f5f8fd;border:1px solid #e6edf7;border-radius:16px;padding:12px 14px;color:#4d5b72}
.tip-box{background:#eef5ff;border:1px solid #d7e8ff;color:#335070;border-radius:20px;padding:18px;margin:20px 0}
.side-panel{background:#fff;border:1px solid #e5eaf3;border-radius:26px;padding:20px;box-shadow:0 12px 32px rgba(34,48,74,.06)}
.side-panel h3{margin:0 0 12px;color:#17213a}
.side-panel a{display:block;padding:10px 0;border-bottom:1px solid #eef2f7;font-weight:700}
.side-panel a:last-child{border-bottom:none}
.inline-image{margin:18px 0;border-radius:24px;overflow:hidden;border:1px solid #e5eaf3;background:#f7faff}
.download-note{display:flex;align-items:center;justify-content:center;margin-top:26px}
.download-steps{counter-reset:step;display:grid;gap:14px;margin-top:22px}
.download-step{background:#fff;border:1px solid #e5eaf3;border-radius:20px;padding:18px}
.download-step h3{margin:0 0 8px;color:#17213a}
.download-step p{margin:0;color:#647086}
.site-footer{background:#17213a;color:#c4ccda;padding:46px 0 20px}
.footer-grid{display:grid;grid-template-columns:1fr;gap:26px}
.footer-logo{font-size:24px;font-weight:900;color:#fff;margin-bottom:10px}
.footer-brand p{margin:0;color:#aeb8c8}
.footer-links h3{font-size:16px;margin:0 0 10px;color:#fff}
.footer-links a{display:block;color:#c4ccda;padding:6px 0}
.footer-links a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:18px;font-size:13px;color:#9faabd}
@media (min-width:680px){
  .hero-content h1{font-size:52px}
  .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)}
  .device-grid{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr}
}
@media (min-width:960px){
  .site-nav{display:flex;position:static;padding:0;background:transparent;border:0;box-shadow:none;align-items:center;gap:4px}
  .site-nav a{padding:9px 12px}
  .nav-toggle-btn{display:none}
  .vpn-network-hero{padding:96px 0 72px}
  .hero-grid{grid-template-columns:1.05fr .95fr;gap:44px}
  .hero-content h1{font-size:62px}
  .node-grid{grid-template-columns:repeat(4,1fr)}
  .split-section{grid-template-columns:1fr 1fr}
  .split-section.reverse .text-panel{order:2}
  .split-section.reverse .media-panel{order:1}
  .info-grid{grid-template-columns:repeat(3,1fr)}
  .risk-grid{grid-template-columns:repeat(3,1fr)}
  .process-steps{grid-template-columns:repeat(3,1fr)}
  .tech-panel{grid-template-columns:1.1fr repeat(2,1fr)}
  .content-layout{grid-template-columns:minmax(0,1fr) 320px}
  .article-panel{padding:34px}
  .footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr}
}
@media (max-width:420px){
  .container{width:min(100% - 24px,1120px)}
  .hero-content h1{font-size:34px}
  .section-title,.cta-section h2{font-size:26px}
  .page-hero h1{font-size:30px}
  .download-btn{width:100%}
  .status-chip{position:static;margin:8px 0;display:inline-flex}
  .hero-visual{padding:8px}
}