:root{
    --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
    --blue:#2980FE;
    --blue-dark:#1768E8;
    --text:#1F2937;
    --muted:#667085;
    --light:#F6F8FC;
    --line:#E7ECF5;
    --card:#FFFFFF;
    --deep:#111827;
    --radius:24px;
    --shadow:0 18px 45px rgba(23,46,94,.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:1.75;font-size:16px}
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,.94);backdrop-filter:blur(16px);border-bottom:1px solid rgba(231,236,245,.9)}
.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:#1c2b56;font-size:20px;letter-spacing:.03em}
.brand-logo{width:38px;height:38px;border-radius:12px;object-fit:cover;box-shadow:0 10px 25px rgba(41,128,254,.15)}
.nav-toggle{display:none}
.nav-toggle-label{display:flex;flex-direction:column;gap:5px;width:40px;height:40px;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:12px;background:#fff}
.nav-toggle-label span{display:block;width:18px;height:2px;background:#2d3748;border-radius:2px}
.site-nav{display:none;position:absolute;left:16px;right:16px;top:68px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:10px}
.site-nav a{display:block;padding:11px 14px;color:#344054;border-radius:12px;font-size:15px}
.site-nav a.active,.site-nav a:hover{background:#EFF6FF;color:var(--blue)}
.nav-toggle:checked~.site-nav{display:block}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 26px;border-radius:999px;background:var(--blue);color:#fff!important;font-weight:700;box-shadow:0 15px 30px rgba(41,128,254,.25);transition:.2s ease;border:0;white-space:nowrap}
.download-btn:hover{background:var(--blue-dark);transform:translateY(-1px);box-shadow:0 18px 36px rgba(23,104,232,.28)}
.vpn-network-hero{position:relative;overflow:hidden;background:var(--gradient);color:#fff;padding:64px 0 42px}
.vpn-network-hero:before,.vpn-network-hero:after{content:"";position:absolute;border-radius:999px;background:rgba(255,255,255,.14);filter:blur(2px)}
.vpn-network-hero:before{width:280px;height:280px;right:-90px;top:-80px}.vpn-network-hero:after{width:180px;height:180px;left:-60px;bottom:-70px}
.hero-grid{position:relative;z-index:1;display:grid;gap:34px;align-items:center}
.hero-copy h1{font-size:clamp(34px,7vw,64px);line-height:1.08;margin:0 0 18px;letter-spacing:-.04em}
.hero-copy p{font-size:17px;color:rgba(255,255,255,.9);margin:0 0 24px;max-width:620px}
.hero-tags,.status-tags,.inline-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.hero-tags span,.status-tags span,.inline-tags span{display:inline-flex;align-items:center;border-radius:999px;padding:7px 12px;font-size:13px;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.22)}
.hero-visual{position:relative;padding:18px;border-radius:32px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.24);box-shadow:0 35px 80px rgba(22,34,92,.24)}
.hero-visual:before{content:"";position:absolute;inset:20px;border:1px dashed rgba(255,255,255,.25);border-radius:28px;background:radial-gradient(circle at 20% 20%,rgba(255,255,255,.18),transparent 26%),radial-gradient(circle at 80% 30%,rgba(255,255,255,.16),transparent 25%),radial-gradient(circle at 52% 78%,rgba(255,255,255,.14),transparent 24%)}
.hero-visual img{position:relative;z-index:1;border-radius:28px;margin:auto;max-height:430px;object-fit:contain}
.float-card{position:absolute;z-index:2;background:#fff;color:#273044;border-radius:18px;padding:10px 14px;box-shadow:0 18px 45px rgba(15,23,42,.18);font-weight:700;font-size:13px}
.float-card.one{top:22px;left:18px}.float-card.two{top:34%;right:8px}.float-card.three{bottom:24px;left:22px}.float-card.four{bottom:18%;right:22px}
.section{padding:58px 0}.section-muted{background:var(--light)}
.section-title{max-width:760px;margin:0 auto 28px;text-align:center}.section-title.left{text-align:left;margin-left:0}.section-title .eyebrow,.eyebrow{display:inline-flex;align-items:center;color:var(--blue);background:#ECF4FF;border:1px solid #DCEBFF;border-radius:999px;padding:5px 11px;font-weight:800;font-size:13px;margin-bottom:10px}
.section-title h2{font-size:clamp(26px,4vw,42px);line-height:1.2;margin:0 0 12px;color:#111827;letter-spacing:-.03em}.section-title p{margin:0;color:var(--muted)}
.node-overview{display:grid;gap:16px}.node-card,.service-card,.risk-card,.faq-item,.policy-card,.step-card,.tip-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 30px rgba(31,41,55,.05)}
.node-card{padding:22px}.node-card .tag{display:inline-flex;background:#ECF4FF;color:var(--blue);border-radius:999px;padding:4px 10px;font-size:12px;font-weight:800;margin-bottom:12px}.node-card h3{margin:0 0 8px;font-size:20px}.node-card p{margin:0 0 14px;color:var(--muted)}.text-link{color:var(--blue);font-weight:800}.text-link:hover{text-decoration:underline}
.split-section{display:grid;gap:28px;align-items:center}.split-section.reverse .media-box{order:-1}.media-box{border-radius:32px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);padding:18px;overflow:hidden}.media-box img{border-radius:24px;margin:auto;max-height:380px;object-fit:contain}.feature-list{display:grid;gap:12px;margin:20px 0 0;padding:0;list-style:none}.feature-list li{padding:14px 16px;border:1px solid var(--line);background:#fff;border-radius:16px;color:#344054}.feature-list strong{color:#111827}
.global-nodes-section{position:relative;overflow:hidden;background:#F7FAFF}.map-panel{position:relative;border-radius:32px;background:radial-gradient(circle at 20% 20%,#EAF2FF,transparent 24%),radial-gradient(circle at 82% 32%,#F4EAFE,transparent 25%),#fff;border:1px solid var(--line);padding:24px;box-shadow:var(--shadow)}.map-panel:before{content:"";position:absolute;inset:18px;border:1px dashed #C9D8F2;border-radius:26px}.map-panel>*{position:relative}.node-dots{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:18px}.node-dots span{background:#fff;border:1px solid var(--line);border-radius:16px;padding:12px;color:#344054;font-weight:700}
.speed-lines{display:grid;gap:12px;margin-top:18px}.speed-line{background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px}.speed-line b{display:block;margin-bottom:8px}.bar{height:8px;border-radius:999px;background:#EAF2FF;overflow:hidden}.bar i{display:block;height:100%;border-radius:999px;background:var(--blue)}
.privacy-protection-section .safety-panel{background:#fff;border:1px solid var(--line);border-radius:32px;padding:24px;box-shadow:var(--shadow)}.safety-panel .panel-row{display:flex;gap:12px;align-items:flex-start;padding:14px 0;border-bottom:1px solid var(--line)}.safety-panel .panel-row:last-child{border-bottom:0}.panel-dot{width:10px;height:10px;border-radius:50%;background:var(--blue);margin-top:9px;flex:0 0 auto}
.policy-grid,.device-grid,.protocol-grid,.risk-grid,.faq-grid,.page-card-grid{display:grid;gap:16px}.policy-card,.service-card,.risk-card,.faq-item,.tip-card{padding:20px}.policy-card h3,.service-card h3,.risk-card h3,.faq-item h3,.tip-card h3{margin:0 0 8px;color:#111827}.policy-card p,.service-card p,.risk-card p,.faq-item p,.tip-card p{margin:0;color:var(--muted)}
.device-card{display:grid;gap:14px;background:#fff;border:1px solid var(--line);border-radius:28px;padding:20px;box-shadow:var(--shadow)}.device-card img{border-radius:22px;max-height:240px;margin:auto}
.protocol-panel{background:#111827;color:#fff;border-radius:32px;padding:24px;overflow:hidden;position:relative}.protocol-panel:before{content:"";position:absolute;right:-60px;top:-60px;width:200px;height:200px;background:rgba(41,128,254,.28);border-radius:50%;filter:blur(12px)}.protocol-panel h2,.protocol-panel h3{color:#fff}.protocol-panel p{color:rgba(255,255,255,.78)}.protocol-panel .service-card{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.14);color:#fff}.protocol-panel .service-card p{color:rgba(255,255,255,.72)}
.process-steps{display:grid;gap:16px}.step-card{padding:20px;position:relative;overflow:hidden}.step-num{display:inline-flex;width:34px;height:34px;align-items:center;justify-content:center;background:#ECF4FF;color:var(--blue);border-radius:12px;font-weight:900;margin-bottom:10px}.risk-card{border-left:4px solid var(--blue)}
.cta-section{background:var(--gradient);color:#fff;text-align:center;padding:56px 0}.cta-box{max-width:760px;margin:auto}.cta-box h2{font-size:clamp(28px,5vw,44px);line-height:1.15;margin:0 0 12px}.cta-box p{color:rgba(255,255,255,.86);margin:0 0 24px}.cta-section .download-btn{background:#2980FE}.cta-section .download-btn:hover{background:#1768E8}
.page-hero{background:linear-gradient(135deg,#F7FAFF 0%,#FFFFFF 55%,#F7F0FF 100%);padding:54px 0 34px;border-bottom:1px solid var(--line)}.page-hero-inner{display:grid;gap:22px;align-items:center}.page-badge{display:inline-flex;width:max-content;color:var(--blue);background:#ECF4FF;border:1px solid #DCEBFF;border-radius:999px;padding:6px 12px;font-size:13px;font-weight:900}.page-hero h1{font-size:clamp(32px,6vw,52px);line-height:1.12;margin:0;color:#111827}.page-hero p{margin:0;color:var(--muted);max-width:760px}.page-actions{margin-top:6px}.content-layout{display:grid;gap:22px}.article-body{background:#fff;border:1px solid var(--line);border-radius:28px;padding:22px;box-shadow:var(--shadow)}.article-body h2{font-size:26px;line-height:1.25;margin:0 0 12px}.article-body p{margin:0 0 16px;color:#4B5563}.article-body p:last-child{margin-bottom:0}.side-panel{background:#F8FAFC;border:1px solid var(--line);border-radius:28px;padding:20px;height:max-content}.side-panel h3{margin:0 0 10px}.check-list{margin:0;padding:0;list-style:none;display:grid;gap:10px}.check-list li{padding:12px 14px;background:#fff;border:1px solid var(--line);border-radius:14px}.mini-steps{counter-reset:item;display:grid;gap:12px;margin-top:16px}.mini-step{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px}.mini-step:before{counter-increment:item;content:counter(item);display:inline-flex;width:28px;height:28px;align-items:center;justify-content:center;background:#ECF4FF;color:var(--blue);border-radius:10px;font-weight:900;margin-right:8px}.faq-list{display:grid;gap:14px}.faq-page .faq-item{padding:22px}.faq-page .faq-item h2{font-size:20px;margin:0 0 8px}.faq-page .faq-item p{margin:0;color:var(--muted)}
.site-footer{background:#111827;color:#D1D5DB;padding:46px 0 0}.footer-grid{display:grid;gap:28px}.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:900;font-size:20px;margin-bottom:10px}.footer-brand img{width:36px;height:36px;border-radius:12px;object-fit:cover}.site-footer h3{color:#fff;margin:0 0 12px;font-size:17px}.site-footer a{display:block;color:#D1D5DB;margin:8px 0}.site-footer p{margin:0;color:#B8C0CC}.footer-bottom{text-align:center;border-top:1px solid rgba(255,255,255,.09);margin-top:34px;padding:18px;color:#9CA3AF;font-size:14px}
@media (min-width:640px){.node-overview,.policy-grid,.device-grid,.protocol-grid,.risk-grid,.faq-grid,.page-card-grid{grid-template-columns:repeat(2,1fr)}.process-steps{grid-template-columns:repeat(2,1fr)}.node-dots{grid-template-columns:repeat(4,1fr)}}
@media (min-width:900px){.nav-toggle-label{display:none}.site-nav{display:flex;position:static;background:transparent;border:0;box-shadow:none;padding:0;gap:4px;align-items:center}.site-nav a{padding:8px 12px}.hero-grid{grid-template-columns:1.02fr .98fr}.section{padding:84px 0}.node-overview{grid-template-columns:repeat(4,1fr)}.split-section{grid-template-columns:1fr 1fr;gap:48px}.split-section.reverse .media-box{order:initial}.policy-grid{grid-template-columns:repeat(3,1fr)}.risk-grid{grid-template-columns:repeat(3,1fr)}.faq-grid{grid-template-columns:repeat(2,1fr)}.protocol-grid{grid-template-columns:repeat(3,1fr)}.process-steps{grid-template-columns:repeat(3,1fr)}.page-hero-inner{grid-template-columns:1fr auto}.content-layout{grid-template-columns:minmax(0,1fr) 320px}.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr}.article-body{padding:30px}.page-hero{padding:72px 0 46px}}
@media (min-width:1100px){.device-grid{grid-template-columns:repeat(3,1fr)}}