:root{
    --primary:#2980FE;
    --primary-dark:#1768E8;
    --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
    --text:#1f2937;
    --muted:#64748b;
    --light:#f6f8fc;
    --line:#e5eaf3;
    --white:#fff;
    --shadow:0 18px 45px rgba(43,62,116,.12);
    --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;font-size:16px;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:50;background:rgba(255,255,255,.94);backdrop-filter:blur(16px);border-bottom:1px solid rgba(229,234,243,.8)}
.nav-shell{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:#18233f;letter-spacing:.02em;white-space:nowrap}
.brand img{width:38px;height:38px;border-radius:12px;object-fit:cover;box-shadow:0 8px 18px rgba(41,128,254,.18)}
.site-nav{display:none;position:absolute;left:16px;right:16px;top:68px;background:#fff;border:1px solid var(--line);border-radius:22px;padding:14px;box-shadow:var(--shadow)}
.site-nav a{display:block;padding:12px 14px;border-radius:14px;color:#41516b;font-size:15px}
.site-nav a:hover,.site-nav a.active{color:var(--primary);background:#eef5ff}
.nav-download{font-weight:700}
.nav-toggle{display:none}
.nav-toggle-label{width:42px;height:42px;border-radius:14px;border:1px solid var(--line);display:flex;flex-direction:column;justify-content:center;gap:5px;padding:0 10px;background:#fff}
.nav-toggle-label span{height:2px;background:#20304f;border-radius:10px}
.nav-toggle:checked~.site-nav{display:block}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 26px;border-radius:999px;background:#2980FE;color:#fff;font-weight:800;box-shadow:0 12px 28px rgba(41,128,254,.28);transition:transform .2s ease,background .2s ease,box-shadow .2s ease;white-space:nowrap}
.download-btn:hover{background:#1768E8;transform:translateY(-2px);box-shadow:0 16px 34px rgba(23,104,232,.3)}
.section{padding:70px 0}
.section-soft{background:var(--light)}
.section-title{max-width:720px;margin:0 auto 34px;text-align:center}
.section-title h2,.section-title h1{margin:0 0 12px;font-size:clamp(28px,5vw,44px);line-height:1.18;color:#172033}
.section-title p{margin:0;color:var(--muted)}
.eyebrow,.badge{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;background:#edf5ff;color:var(--primary);font-weight:800;font-size:13px;margin-bottom:14px}
.gradient-bg{background:var(--gradient);color:#fff;position:relative;overflow:hidden}
.gradient-bg:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 15% 20%,rgba(255,255,255,.28),transparent 28%),radial-gradient(circle at 85% 35%,rgba(255,255,255,.18),transparent 26%),linear-gradient(120deg,transparent 0 62%,rgba(255,255,255,.12) 62% 64%,transparent 64%)}
.vpn-network-hero{padding:72px 0 54px;position:relative;overflow:hidden}
.vpn-network-hero .container{position:relative;z-index:2;display:grid;gap:32px;align-items:center}
.hero-copy h1{margin:0 0 18px;font-size:clamp(38px,9vw,68px);line-height:1.05;letter-spacing:-.04em;color:#fff}
.hero-copy p{margin:0 0 22px;color:rgba(255,255,255,.88);font-size:18px;max-width:620px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.hero-tags span,.floating-card{padding:9px 13px;border-radius:999px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.26);color:#fff;font-size:14px;backdrop-filter:blur(12px)}
.hero-visual{position:relative;min-height:330px;display:flex;align-items:center;justify-content:center}
.hero-visual:before{content:"";position:absolute;width:92%;aspect-ratio:1;border-radius:50%;border:1px dashed rgba(255,255,255,.32)}
.hero-visual:after{content:"";position:absolute;inset:12%;border-radius:32px;background:linear-gradient(135deg,rgba(255,255,255,.16),rgba(255,255,255,.04));transform:rotate(-8deg)}
.hero-visual img{position:relative;z-index:2;width:min(470px,88%);filter:drop-shadow(0 30px 45px rgba(19,26,70,.25))}
.floating-card{position:absolute;z-index:3;box-shadow:0 18px 40px rgba(24,31,70,.18)}
.float-a{top:34px;left:0}.float-b{right:0;top:84px}.float-c{bottom:70px;left:10px}.float-d{right:18px;bottom:34px}
.node-overview{margin-top:-32px;position:relative;z-index:4}
.node-overview-grid{display:grid;gap:16px}
.node-card,.card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 14px 35px rgba(23,36,70,.08)}
.node-card .tag{display:inline-block;padding:4px 9px;border-radius:999px;background:#edf5ff;color:var(--primary);font-size:12px;font-weight:800;margin-bottom:10px}
.node-card h3,.card h3{margin:0 0 8px;color:#182238;font-size:20px}
.node-card p,.card p{margin:0;color:var(--muted)}
.text-link{display:inline-flex;margin-top:14px;color:var(--primary);font-weight:800}
.split{display:grid;gap:28px;align-items:center}
.split-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.media-panel{position:relative;border-radius:30px;overflow:hidden;background:#eef4ff;border:1px solid var(--line);padding:24px;box-shadow:var(--shadow)}
.media-panel img{margin:auto;max-height:420px;object-fit:contain}
.feature-list{display:grid;gap:12px;margin:20px 0 0;padding:0;list-style:none}
.feature-list li{padding:12px 14px;border-radius:16px;background:#f7f9fd;border:1px solid var(--line);color:#44546b}
.global-nodes-section{background:linear-gradient(180deg,#f8fbff,#fff)}
.map-panel{position:relative;min-height:330px;border-radius:30px;background:radial-gradient(circle at 30% 30%,rgba(41,128,254,.2),transparent 24%),radial-gradient(circle at 70% 55%,rgba(123,78,241,.18),transparent 24%),#fff;border:1px solid var(--line);overflow:hidden;box-shadow:var(--shadow);padding:26px}
.map-panel:before{content:"";position:absolute;inset:0;background-image:linear-gradient(90deg,rgba(41,128,254,.08) 1px,transparent 1px),linear-gradient(0deg,rgba(41,128,254,.08) 1px,transparent 1px);background-size:48px 48px}
.map-panel img{position:relative;z-index:2;margin:auto;max-height:300px}
.node-dot{position:absolute;z-index:3;width:12px;height:12px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 8px rgba(41,128,254,.12)}
.dot-1{left:24%;top:34%}.dot-2{right:22%;top:28%}.dot-3{left:52%;bottom:30%}
.speed-lines{display:grid;gap:14px;margin-top:22px}
.speed-line{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px}
.speed-line span{display:flex;justify-content:space-between;color:#43536a;font-weight:700;margin-bottom:10px}
.speed-line i{display:block;height:8px;border-radius:999px;background:linear-gradient(90deg,#2980FE,#9abfff)}
.privacy-protection-section .privacy-panel{background:#fff;border:1px solid var(--line);border-radius:30px;padding:26px;box-shadow:var(--shadow)}
.privacy-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.privacy-tags span{padding:8px 12px;border-radius:999px;background:#f0f6ff;color:#2d5fa8;font-weight:700;font-size:14px}
.no-log-policy-section .policy-grid,.risk-grid,.faq-grid,.related-grid{display:grid;gap:16px}
.policy-card,.risk-card,.faq-item,.related-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 12px 30px rgba(32,48,84,.07)}
.policy-card strong,.risk-card strong{display:block;color:#172033;font-size:18px;margin-bottom:8px}
.multi-device-section .device-grid{display:grid;grid-template-columns:1fr;gap:14px;margin-top:20px}
.device-card{padding:16px;border-radius:18px;background:#f8fbff;border:1px solid var(--line)}
.tech-panel{background:#14203a;color:#fff;border-radius:30px;padding:26px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.tech-panel:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 80% 20%,rgba(41,128,254,.38),transparent 28%)}
.tech-panel>*{position:relative;z-index:2}
.tech-row{display:grid;gap:14px;margin-top:18px}
.tech-row div{padding:16px;border-radius:18px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.14)}
.process-steps{display:grid;gap:16px;counter-reset:step}
.process-step{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 12px 30px rgba(32,48,84,.07);position:relative}
.process-step:before{counter-increment:step;content:counter(step);display:inline-flex;width:34px;height:34px;align-items:center;justify-content:center;border-radius:12px;background:var(--primary);color:#fff;font-weight:900;margin-bottom:12px}
.process-step h3{margin:0 0 8px}.process-step p{margin:0;color:var(--muted)}
.risk-card{border-left:4px solid var(--primary)}
.risk-card em{display:block;font-style:normal;color:#43536a;margin-top:8px}
.faq-item h3{margin:0 0 8px;font-size:18px}.faq-item p{margin:0;color:var(--muted)}
.cta-section{position:relative;padding:66px 0;text-align:center;color:#fff;overflow:hidden;background:var(--gradient)}
.cta-section:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 25% 30%,rgba(255,255,255,.22),transparent 25%),radial-gradient(circle at 75% 70%,rgba(255,255,255,.16),transparent 24%)}
.cta-section .container{position:relative;z-index:2;max-width:760px}.cta-section h2{margin:0 0 14px;font-size:clamp(28px,6vw,44px)}.cta-section p{margin:0 0 24px;color:rgba(255,255,255,.86)}
.subpage-hero{padding:54px 0;background:linear-gradient(180deg,#f7faff,#fff);border-bottom:1px solid var(--line)}
.subpage-hero-inner{max-width:860px}.subpage-hero h1{margin:0 0 12px;font-size:clamp(32px,7vw,52px);line-height:1.15;color:#172033}.subpage-hero p{margin:0;color:var(--muted);font-size:18px}
.content-layout{display:grid;gap:24px;align-items:start}.article-card{background:#fff;border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:var(--shadow)}
.article-card h2{margin:0 0 12px;color:#172033}.article-card p{color:#4a5870;margin:0 0 16px}.article-card p:last-child{margin-bottom:0}
.check-list,.number-list{display:grid;gap:12px;padding:0;margin:18px 0;list-style:none}.check-list li,.number-list li{padding:13px 14px;border-radius:16px;background:#f8fbff;border:1px solid var(--line);color:#43536a}.number-list{counter-reset:item}.number-list li:before{counter-increment:item;content:counter(item) '. ';font-weight:900;color:var(--primary)}
.side-panel{background:#f8fbff;border:1px solid var(--line);border-radius:24px;padding:22px;position:sticky;top:92px}.side-panel h3{margin:0 0 10px}.side-panel a{display:block;color:var(--primary);font-weight:800;margin-top:10px}
.download-area{margin:22px 0}.download-page .download-area{text-align:center;margin:26px 0 6px}
.site-footer{background:#172033;color:#cdd6e5;padding:52px 0 24px;margin-top:0}.footer-grid{display:grid;gap:26px}.footer-brand{color:#fff;font-weight:900;font-size:20px;margin-bottom:10px}.site-footer p{margin:0;color:#aeb9cb}.site-footer h3{color:#fff;margin:0 0 12px;font-size:16px}.site-footer a{display:block;color:#cdd6e5;margin:7px 0}.site-footer a:hover{color:#fff}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:30px;padding-top:18px;display:flex;flex-direction:column;gap:8px;color:#9aa8bc;font-size:14px}
@media (min-width:720px){
    .node-overview-grid{grid-template-columns:repeat(2,1fr)}
    .policy-grid,.risk-grid,.faq-grid,.related-grid{grid-template-columns:repeat(2,1fr)}
    .process-steps{grid-template-columns:repeat(2,1fr)}
    .multi-device-section .device-grid{grid-template-columns:repeat(3,1fr)}
    .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}.footer-bottom{flex-direction:row;justify-content:space-between}
}
@media (min-width:980px){
    .site-nav{position:static;display:flex;align-items:center;gap:2px;background:transparent;border:0;border-radius:0;padding:0;box-shadow:none}.site-nav a{padding:9px 10px;font-size:14px}.nav-toggle-label{display:none}.nav-shell{min-height:76px}
    .vpn-network-hero{padding:96px 0 76px}.vpn-network-hero .container{grid-template-columns:1.05fr .95fr;gap:48px}.hero-copy p{font-size:19px}
    .node-overview-grid{grid-template-columns:repeat(4,1fr)}
    .split{grid-template-columns:1fr 1fr;gap:42px}.split.reverse .split-card{order:2}.split.reverse .media-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)}
    .content-layout{grid-template-columns:minmax(0,1fr) 310px}.article-card{padding:34px}.section{padding:88px 0}
}
@media (max-width:420px){.container{width:min(100% - 24px,1120px)}.download-btn{width:100%;padding:0 18px}.hero-tags span{font-size:13px}.floating-card{font-size:12px}.float-a{left:4px}.float-b{right:4px}.float-c{bottom:52px}.float-d{right:6px;bottom:8px}.article-card{padding:20px}.site-nav{left:12px;right:12px}}