:root{
    --blue:#2980FE;
    --blue-dark:#1768E8;
    --text:#243044;
    --muted:#697386;
    --light:#F5F7FB;
    --line:#E6EAF2;
    --card:#FFFFFF;
    --deep:#172033;
    --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
    --shadow:0 18px 50px rgba(31,45,78,.10);
    --radius:24px;
}
*{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:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(1120px,calc(100% - 32px));margin:0 auto}
.container.narrow{width:min(880px,calc(100% - 32px))}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.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,.footer-logo{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--deep);font-size:20px}
.brand img,.footer-logo img{width:38px;height:38px;border-radius:12px;object-fit:cover}
.nav-toggle{display:none}
.nav-toggle-label{width:42px;height:42px;border:1px solid var(--line);border-radius:14px;display:flex;flex-direction:column;justify-content:center;gap:5px;padding:0 10px;background:#fff}
.nav-toggle-label span{height:2px;background:var(--deep);border-radius:2px}
.site-nav{position:absolute;left:16px;right:16px;top:72px;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:12px;display:none;grid-template-columns:1fr 1fr;gap:6px}
.nav-toggle:checked~.site-nav{display:grid}
.site-nav a{padding:10px 12px;border-radius:12px;color:#445066;font-size:14px}
.site-nav a.active,.site-nav a:hover{background:#F0F6FF;color:var(--blue)}
.gradient-bg{background:var(--gradient);color:#fff;position:relative;overflow:hidden}
.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:700;box-shadow:0 14px 28px rgba(41,128,254,.25);transition:.2s ease;border:0;line-height:1}
.download-btn:hover{background:#1768E8;transform:translateY(-1px)}
.vpn-network-hero{padding:72px 0 54px}
.hero-network-lines{position:absolute;inset:0;opacity:.34;background:radial-gradient(circle at 15% 25%,rgba(255,255,255,.32) 0 2px,transparent 3px),radial-gradient(circle at 72% 32%,rgba(255,255,255,.28) 0 2px,transparent 3px),radial-gradient(circle at 60% 75%,rgba(255,255,255,.22) 0 2px,transparent 3px),linear-gradient(135deg,transparent 0 48%,rgba(255,255,255,.18) 49%,transparent 51%),linear-gradient(25deg,transparent 0 38%,rgba(255,255,255,.12) 39%,transparent 41%)}
.hero-grid{position:relative;display:grid;gap:34px;align-items:center}
.eyebrow,.page-badge{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:rgba(255,255,255,.16);color:#fff;font-size:13px;font-weight:700;letter-spacing:.02em}
.eyebrow.blue,.page-badge{background:#EEF5FF;color:var(--blue)}
.hero-copy h1{font-size:clamp(34px,8vw,64px);line-height:1.08;margin:18px 0 18px;letter-spacing:-.04em}
.hero-copy p{font-size:16px;color:rgba(255,255,255,.88);margin:0 0 24px;max-width:620px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.hero-tags span{padding:8px 12px;border:1px solid rgba(255,255,255,.24);background:rgba(255,255,255,.12);border-radius:999px;font-size:13px}
.hero-visual{position:relative;padding:20px;min-height:320px;display:flex;align-items:center;justify-content:center}
.hero-visual:before{content:"";position:absolute;inset:10%;background:rgba(255,255,255,.18);filter:blur(22px);border-radius:50%}
.hero-visual img{position:relative;max-height:440px;border-radius:32px;box-shadow:0 30px 80px rgba(14,22,54,.28)}
.float-card{position:absolute;background:rgba(255,255,255,.92);color:var(--deep);border-radius:16px;padding:10px 14px;font-weight:800;box-shadow:0 14px 38px rgba(31,45,78,.18);font-size:13px}
.card-a{top:26px;left:10px}.card-b{right:4px;top:70px}.card-c{left:0;bottom:78px}.card-d{right:10px;bottom:30px}
.section-lift{margin-top:-24px;position:relative;z-index:3}.content-section{padding:64px 0}.soft-bg{background:#F6F8FC}
.section-heading{margin-bottom:28px}.section-heading.centered{text-align:center}.section-heading h2,.content-panel h2,.article-main h2,.cta-inner h2{font-size:clamp(26px,5vw,42px);line-height:1.18;margin:12px 0;color:var(--deep);letter-spacing:-.03em}.section-heading p,.content-panel p{color:var(--muted);margin:0}
.overview-grid{display:grid;grid-template-columns:1fr;gap:16px}.node-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 16px 42px rgba(25,43,80,.07)}.node-card span{display:inline-flex;width:34px;height:34px;align-items:center;justify-content:center;border-radius:12px;background:#EEF5FF;color:var(--blue);font-weight:800}.node-card h3{margin:14px 0 8px;color:var(--deep)}.node-card p{color:var(--muted);margin:0 0 14px}.node-card a,.text-link{color:var(--blue);font-weight:800}.split-grid,.nodes-layout,.protocol-layout,.article-layout,.two-column-guide{display:grid;gap:28px;align-items:center}.image-panel,.privacy-panel,.node-map-card,.protocol-card,.guide-card,.side-panel,.info-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}.image-panel img,.node-map-card img,.privacy-panel img,.protocol-card img{border-radius:20px}.feature-list,.check-list{padding:0;margin:18px 0;list-style:none}.feature-list li,.check-list li{position:relative;padding-left:24px;margin:10px 0;color:#4B5567}.feature-list li:before,.check-list li:before{content:"";position:absolute;left:0;top:.72em;width:9px;height:9px;background:var(--blue);border-radius:50%}.map-note{margin:20px 0;padding:18px;border-left:4px solid var(--blue);background:#fff;border-radius:16px}.node-map-card{position:relative;overflow:hidden;background:linear-gradient(145deg,#fff,#F0F6FF)}.node-dot{position:absolute;width:14px;height:14px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 8px rgba(41,128,254,.12)}.dot-1{left:22%;top:35%}.dot-2{right:28%;top:24%}.dot-3{left:58%;bottom:24%}.speed-cards,.device-grid,.tag-row{display:grid;grid-template-columns:1fr;gap:12px;margin:20px 0}.speed-cards div,.device-grid span,.tag-row span{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px}.speed-cards strong{display:block;color:var(--deep)}.speed-cards span{color:var(--muted);font-size:14px}.privacy-panel{display:grid;gap:18px}.tag-row span,.device-grid span{color:var(--blue);font-weight:800;background:#EEF5FF}.policy-grid{display:grid;grid-template-columns:1fr;gap:16px}.policy-grid article{background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px}.policy-grid h3,.risk-grid h3,.process-steps h3{margin:0 0 8px;color:var(--deep)}.policy-grid p,.risk-grid p,.process-steps p{color:var(--muted);margin:0}.center-link{text-align:center;margin-top:18px}.protocol-card{background:linear-gradient(160deg,#fff,#F2F7FF)}.process-steps{display:grid;grid-template-columns:1fr;gap:16px}.process-steps article{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px}.process-steps span{display:inline-flex;width:36px;height:36px;align-items:center;justify-content:center;border-radius:50%;background:var(--blue);color:#fff;font-weight:900;margin-bottom:12px}.process-steps a,.risk-grid a{display:inline-flex;margin-top:12px;color:var(--blue);font-weight:800}.risk-grid{display:grid;grid-template-columns:1fr;gap:16px}.risk-grid article{background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:20px;padding:20px}.risk-grid b{display:block;margin-top:12px;color:var(--deep)}.risk-grid span{color:var(--muted)}.faq-list{display:grid;gap:12px}.faq-item,.faq-list details{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px}.faq-list summary{cursor:pointer;font-weight:800;color:var(--deep)}.faq-list p{color:var(--muted);margin:10px 0 0}.cta-section{padding:64px 0;text-align:center}.cta-inner h2{color:#fff;margin-top:0}.cta-inner p{color:rgba(255,255,255,.86);margin:0 0 24px}.page-hero{padding:64px 0 52px;background:linear-gradient(180deg,#F6F8FF,#fff)}.simple-hero h1{font-size:clamp(32px,7vw,54px);line-height:1.12;margin:16px 0;color:var(--deep);letter-spacing:-.035em}.simple-hero p{font-size:17px;color:var(--muted);margin:0 0 22px}.article-layout{align-items:start}.article-main{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}.article-main p{color:#4B5567;margin:0 0 16px}.article-main h2{font-size:26px;margin:4px 0 14px}.info-box{margin-top:22px;background:#F7FAFF;box-shadow:none}.side-panel{position:relative}.side-panel h3{margin-top:0;color:var(--deep)}.side-panel a{display:block;padding:12px 0;border-bottom:1px solid var(--line);color:var(--blue);font-weight:800}.side-panel a:last-child{border-bottom:0}.number-list{list-style:none;margin:0;padding:0;display:grid;gap:14px}.number-list li{display:grid;gap:4px;padding:16px;border:1px solid var(--line);border-radius:16px;background:#F8FAFE}.number-list strong{color:var(--deep)}.number-list span{color:var(--muted)}.safety-panel{background:linear-gradient(160deg,#fff,#F3F7FF)}.site-footer{background:#101827;color:#C9D2E3;padding-top:46px}.footer-inner{width:min(1120px,calc(100% - 32px));margin:0 auto;display:grid;gap:28px}.footer-brand p{max-width:420px;color:#AEB8CA}.footer-logo{color:#fff}.footer-links{display:grid;grid-template-columns:1fr;gap:22px}.footer-links h3{color:#fff;margin:0 0 10px}.footer-links a{display:block;color:#C9D2E3;margin:8px 0}.footer-bottom{text-align:center;border-top:1px solid rgba(255,255,255,.09);margin-top:34px;padding:18px;color:#93A0B7;font-size:14px}
@media (min-width:700px){.overview-grid{grid-template-columns:repeat(2,1fr)}.speed-cards,.device-grid,.tag-row{grid-template-columns:repeat(3,1fr)}.device-grid{grid-template-columns:repeat(4,1fr)}.policy-grid,.risk-grid{grid-template-columns:repeat(2,1fr)}.process-steps{grid-template-columns:repeat(2,1fr)}.footer-links{grid-template-columns:repeat(3,1fr)}}
@media (min-width:980px){.nav-toggle-label{display:none}.site-nav{position:static;display:flex;background:transparent;border:0;box-shadow:none;padding:0;gap:2px;align-items:center}.site-nav a{font-size:14px}.vpn-network-hero{padding:96px 0 82px}.hero-grid{grid-template-columns:1.06fr .94fr}.overview-grid{grid-template-columns:repeat(4,1fr)}.split-grid,.nodes-layout,.protocol-layout,.two-column-guide{grid-template-columns:1fr 1fr}.article-layout{grid-template-columns:minmax(0,1fr) 300px}.reverse .content-panel{order:2}.reverse .image-panel{order:1}.policy-grid{grid-template-columns:repeat(3,1fr)}.risk-grid{grid-template-columns:repeat(3,1fr)}.process-steps{grid-template-columns:repeat(3,1fr)}.footer-inner{grid-template-columns:1fr 1.35fr}.content-section{padding:82px 0}.page-hero{padding:82px 0 64px}.article-main{padding:34px}.layout-alt{grid-template-columns:300px minmax(0,1fr)}.layout-alt .side-panel{order:1}.layout-alt .article-main{order:2}.layout-compact{grid-template-columns:minmax(0,1fr) 260px}}
@media (max-width:420px){.container{width:min(100% - 24px,1120px)}.header-inner{width:min(100% - 20px,1180px)}.download-btn{width:100%;padding:0 18px}.hero-visual{min-height:260px;padding:10px}.float-card{font-size:12px;padding:8px 10px}.content-section{padding:50px 0}.article-main,.image-panel,.privacy-panel,.node-map-card,.protocol-card,.guide-card,.side-panel,.info-box{padding:18px;border-radius:20px}}