:root{
    --brand-gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue:#2980FE;
    --blue-dark:#1768E8;
    --text:#1f2937;
    --muted:#64748b;
    --light:#f6f8fc;
    --line:#e5eaf3;
    --white:#ffffff;
    --deep:#111827;
    --radius:24px;
    --shadow:0 18px 45px rgba(20,38,86,.10);
}
*{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:var(--text);
    background:#fff;
    line-height:1.75;
    overflow-x:hidden;
}
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:20;background:rgba(255,255,255,.92);
    border-bottom:1px solid rgba(229,234,243,.85);backdrop-filter: blur(16px);
}
.header-inner{width:min(1180px, calc(100% - 28px));margin:0 auto;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;font-size:20px;color:#15213b;letter-spacing:.02em}
.logo{width:38px;height:38px;border-radius:12px;object-fit:cover;box-shadow:0 8px 18px rgba(41,128,254,.18)}
.nav-toggle{border:1px solid var(--line);background:#fff;color:#24304a;border-radius:999px;padding:8px 14px;font-weight:700;display:inline-flex}
.site-nav{position:absolute;left:16px;right:16px;top:76px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:10px;display:none;grid-template-columns:1fr;gap:4px}
.site-nav.is-open{display:grid}
.site-nav a{padding:11px 14px;border-radius:14px;color:#3b4664;font-weight:650;font-size:14px}
.site-nav a:hover,.site-nav a.active{background:#eef5ff;color:var(--blue)}
.download-btn{
    display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:12px 24px;
    background:var(--blue);color:#fff;border-radius:999px;font-weight:800;box-shadow:0 16px 30px rgba(41,128,254,.26);
    transition:transform .2s ease, background .2s ease, box-shadow .2s ease;
}
.download-btn:hover{background:var(--blue-dark);transform:translateY(-2px);box-shadow:0 18px 36px rgba(23,104,232,.30)}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;background:#eef5ff;color:var(--blue);font-weight:800;font-size:13px}
.section{padding:68px 0}
.section-soft{background:var(--light)}
.section-title{max-width:760px;margin:0 auto 30px;text-align:center}
.section-title h2{font-size:clamp(28px,5vw,42px);line-height:1.18;margin:12px 0;color:#14213d}
.section-title p{margin:0;color:var(--muted)}
.vpn-network-hero{position:relative;overflow:hidden;background:var(--brand-gradient);color:#fff;padding:62px 0 54px}
.vpn-network-hero:before,.vpn-network-hero:after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.18);filter:blur(4px)}
.vpn-network-hero:before{width:420px;height:420px;right:-150px;top:-130px}.vpn-network-hero:after{width:280px;height:280px;left:-90px;bottom:-90px}
.hero-grid{position:relative;z-index:1;display:grid;gap:34px;align-items:center}
.hero-copy h1{font-size:clamp(34px,9vw,60px);line-height:1.08;margin:14px 0 18px;letter-spacing:-.04em}
.hero-copy p{font-size:17px;color:rgba(255,255,255,.88);margin:0 0 24px;max-width:660px}
.hero-tags{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.hero-tags span{border:1px solid rgba(255,255,255,.35);background:rgba(255,255,255,.12);border-radius:999px;padding:7px 12px;color:#fff;font-size:13px}
.hero-visual{position:relative;min-height:320px}.hero-card{position:relative;margin:0 auto;max-width:430px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);border-radius:32px;padding:18px;box-shadow:0 30px 80px rgba(14,24,74,.25);backdrop-filter:blur(12px)}
.hero-card img{border-radius:24px;background:#fff}.status-pill{position:absolute;background:#fff;color:#182647;border-radius:999px;padding:9px 13px;font-size:13px;font-weight:800;box-shadow:0 16px 34px rgba(19,31,74,.18)}
.pill-a{left:2px;top:24px}.pill-b{right:2px;top:78px}.pill-c{left:16px;bottom:74px}.pill-d{right:12px;bottom:28px}
.node-lines{position:absolute;inset:0;background-image:radial-gradient(circle at 18% 28%,rgba(255,255,255,.75) 0 2px,transparent 3px),radial-gradient(circle at 76% 32%,rgba(255,255,255,.72) 0 2px,transparent 3px),radial-gradient(circle at 62% 72%,rgba(255,255,255,.72) 0 2px,transparent 3px),linear-gradient(135deg,transparent 0 45%,rgba(255,255,255,.18) 45.2%,transparent 45.8%),linear-gradient(25deg,transparent 0 54%,rgba(255,255,255,.14) 54.2%,transparent 54.8%);opacity:.75}
.node-overview{margin-top:-32px;position:relative;z-index:2}.node-grid{display:grid;gap:16px}.node-card,.feature-card,.risk-card,.faq-item,.step-card,.policy-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 10px 30px rgba(25,41,82,.06)}
.node-card strong{display:block;color:#14213d;font-size:18px;margin:8px 0}.node-card p,.feature-card p,.risk-card p,.step-card p,.policy-card p{color:var(--muted);margin:0}.text-link{display:inline-flex;margin-top:14px;color:var(--blue);font-weight:800}.text-link:hover{color:var(--blue-dark)}
.split-section{display:grid;gap:28px;align-items:center}.split-section.reverse .visual{order:-1}.visual-panel{position:relative;border-radius:30px;background:linear-gradient(145deg,#eef5ff,#fff);padding:20px;border:1px solid var(--line);box-shadow:var(--shadow)}
.visual-panel img{border-radius:24px}.content-panel h2{font-size:clamp(26px,5vw,40px);line-height:1.2;color:#14213d;margin:14px 0}.content-panel p{color:var(--muted);margin:0 0 16px}.bullet-list{display:grid;gap:10px;margin:18px 0;padding:0;list-style:none}.bullet-list li{padding-left:28px;position:relative;color:#39455e}.bullet-list li:before{content:"";width:10px;height:10px;background:var(--blue);border-radius:50%;position:absolute;left:0;top:.72em}
.global-nodes-section{background:#f7f9fe}.map-panel{position:relative;overflow:hidden;border-radius:32px;background:linear-gradient(135deg,#f7fbff,#eef4ff);border:1px solid var(--line);padding:26px;box-shadow:var(--shadow)}
.map-panel:before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 20% 30%,#2980FE 0 3px,transparent 4px),radial-gradient(circle at 60% 24%,#7B4EF1 0 3px,transparent 4px),radial-gradient(circle at 78% 68%,#B84DDA 0 3px,transparent 4px),linear-gradient(20deg,transparent 0 48%,rgba(41,128,254,.20) 48.4%,transparent 49%);opacity:.45}.map-panel>*{position:relative;z-index:1}
.speed-cards,.policy-grid,.device-grid,.protocol-grid,.risk-grid,.detail-cards{display:grid;gap:16px}.speed-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px}.speed-card span{color:var(--blue);font-weight:900;font-size:22px}.privacy-panel{background:#fff;border:1px solid var(--line);border-radius:30px;padding:26px;box-shadow:var(--shadow)}.tag-row{display:flex;gap:8px;flex-wrap:wrap}.tag-row span{background:#eef5ff;color:#1d65ca;border-radius:999px;padding:7px 10px;font-weight:750;font-size:13px}
.process-steps{display:grid;gap:14px;counter-reset:step}.step-card{position:relative;padding-left:72px}.step-card:before{counter-increment:step;content:counter(step);position:absolute;left:22px;top:24px;width:34px;height:34px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:900}.step-card h3,.risk-card h3,.feature-card h3,.policy-card h3{margin:0 0 8px;color:#14213d}.risk-card{border-left:4px solid var(--blue)}.risk-card em{display:block;margin-top:10px;color:#334155;font-style:normal;font-weight:800}
.faq-list{display:grid;gap:14px}.faq-item h3{margin:0 0 8px;color:#14213d;font-size:18px}.faq-item p{margin:0;color:var(--muted)}
.cta-section{background:var(--brand-gradient);color:#fff;text-align:center;border-radius:34px;padding:40px 22px;position:relative;overflow:hidden}.cta-section h2{font-size:clamp(26px,5vw,42px);line-height:1.18;margin:0 0 12px}.cta-section p{max-width:680px;margin:0 auto 22px;color:rgba(255,255,255,.86)}
.page-hero{padding:54px 0 34px;background:linear-gradient(180deg,#f3f7ff,#fff)}.page-hero h1{font-size:clamp(32px,7vw,52px);line-height:1.12;margin:14px 0;color:#14213d}.page-hero p{color:var(--muted);max-width:780px;margin:0}.detail-layout{display:grid;gap:26px;align-items:start}.article-card{background:#fff;border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:0 12px 35px rgba(25,41,82,.06)}.article-card h2{margin:0 0 12px;color:#14213d}.article-card p{color:#4b5563}.side-panel{background:#f8fbff;border:1px solid var(--line);border-radius:24px;padding:22px;position:sticky;top:92px}.side-panel h3{margin-top:0;color:#14213d}.check-list{padding:0;margin:0;list-style:none;display:grid;gap:10px}.check-list li{padding:12px 14px;border-radius:14px;background:#fff;border:1px solid var(--line);color:#475569}.download-row{margin-top:24px}.download-page-grid{display:grid;gap:18px}.number-list{margin:0;padding-left:20px;color:#475569}.number-list li{margin:8px 0}.highlight-box{border-radius:24px;background:#eef5ff;border:1px solid #d9e8ff;padding:20px;color:#334155}.legal-note{font-size:14px;color:#64748b;margin-top:16px}
.site-footer{background:#111827;color:#d1d5db;padding:48px 0 0}.footer-grid{display:grid;gap:24px}.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-size:20px}.footer-brand img{width:38px;height:38px;border-radius:12px}.site-footer h3{font-size:15px;color:#fff;margin:0 0 10px}.site-footer a{display:block;color:#cbd5e1;margin:7px 0}.site-footer a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,.10);margin-top:34px;padding:18px;text-align:center;color:#94a3b8;font-size:13px}
@media (min-width:640px){
    .node-grid{grid-template-columns:repeat(2,1fr)}.risk-grid,.detail-cards,.policy-grid,.device-grid,.protocol-grid,.speed-cards{grid-template-columns:repeat(2,1fr)}.download-page-grid{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:900px){
    .nav-toggle{display:none}.site-nav{position:static;display:flex;align-items:center;background:transparent;border:0;box-shadow:none;padding:0;gap:4px}.site-nav a{padding:9px 10px;font-size:13px}.hero-grid{grid-template-columns:1.04fr .96fr}.vpn-network-hero{padding:92px 0 78px}.node-grid{grid-template-columns:repeat(4,1fr)}.split-section{grid-template-columns:1fr 1fr;gap:52px}.split-section.reverse .visual{order:2}.process-steps{grid-template-columns:repeat(3,1fr)}.risk-grid{grid-template-columns:repeat(4,1fr)}.policy-grid,.device-grid,.protocol-grid{grid-template-columns:repeat(3,1fr)}.detail-layout{grid-template-columns:minmax(0,1fr) 320px}.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr}.section{padding:86px 0}.article-card{padding:34px}.site-nav a.active{background:#eef5ff;color:var(--blue)}
}
@media (min-width:1100px){.site-nav a{font-size:14px;padding:9px 12px}.hero-visual{min-height:420px}}
@media (max-width:380px){.container{width:min(100% - 24px,1120px)}.download-btn{width:100%}.status-pill{font-size:12px;padding:7px 10px}.hero-card{padding:12px}.page-hero{padding-top:42px}}