:root{
  --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
  --blue:#2980FE;
  --blue-dark:#1768E8;
  --text:#1f2937;
  --muted:#667085;
  --light:#f5f7fb;
  --soft:#eef4ff;
  --border:#e5eaf3;
  --white:#ffffff;
  --radius:24px;
  --shadow:0 18px 45px rgba(31,41,55,.08);
}
*{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}
.narrow{width:min(860px,calc(100% - 32px))}
.section{padding:64px 0}
.section-soft{background:var(--light)}
.section-title{font-size:clamp(28px,4vw,42px);line-height:1.2;margin:0 0 14px;color:#101828}
.section-lead{font-size:17px;color:var(--muted);margin:0 0 24px}.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(18px);border-bottom:1px solid rgba(229,234,243,.9)}
.header-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand,.footer-brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:22px;color:#111827}.brand img,.footer-brand img{width:38px;height:38px;border-radius:12px;object-fit:cover}.main-nav{display:flex;align-items:center;gap:4px;flex-wrap:wrap}.main-nav a{font-size:14px;color:#475467;padding:10px 12px;border-radius:999px}.main-nav a:hover,.main-nav a.active{color:var(--blue);background:#eef5ff}.nav-toggle,.nav-toggle-label{display:none}.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:13px 24px;border-radius:999px;background:var(--blue);color:#fff;font-weight:700;box-shadow:0 12px 28px rgba(41,128,254,.24);transition:.2s ease;border:0}.download-btn:hover{background:var(--blue-dark);transform:translateY(-1px);box-shadow:0 16px 32px rgba(23,104,232,.27)}.link-more{color:var(--blue);font-weight:700;display:inline-flex;align-items:center;gap:4px}.link-more:after{content:"→"}.vpn-network-hero{position:relative;overflow:hidden;background:var(--gradient);color:#fff;padding:72px 0 82px}.vpn-network-hero:before,.vpn-network-hero:after{content:"";position:absolute;inset:auto;pointer-events:none}.vpn-network-hero:before{width:640px;height:640px;right:-250px;top:-250px;background:radial-gradient(circle,rgba(255,255,255,.34),rgba(255,255,255,0) 68%)}.vpn-network-hero:after{left:0;right:0;top:0;bottom:0;background-image:radial-gradient(circle at 18% 22%,rgba(255,255,255,.28) 0 2px,transparent 3px),radial-gradient(circle at 78% 34%,rgba(255,255,255,.22) 0 2px,transparent 3px),radial-gradient(circle at 58% 70%,rgba(255,255,255,.18) 0 2px,transparent 3px),linear-gradient(135deg,rgba(255,255,255,.18) 0 1px,transparent 1px);background-size:220px 180px,260px 220px,300px 260px,80px 80px;opacity:.45}.hero-grid{position:relative;z-index:1;display:grid;gap:38px;align-items:center}.hero-copy h1{font-size:clamp(36px,8vw,66px);line-height:1.08;margin:0 0 18px;letter-spacing:-.04em}.hero-copy p{font-size:18px;color:rgba(255,255,255,.88);margin:0 0 26px;max-width:620px}.hero-tags,.status-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.hero-tags span,.status-tags span,.category-badge{display:inline-flex;align-items:center;border-radius:999px;font-size:13px;font-weight:700}.hero-tags span{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.26);padding:7px 12px;color:#fff}.hero-visual{position:relative;border-radius:32px;padding:18px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.22);box-shadow:0 24px 80px rgba(28,39,78,.22)}.hero-visual img{border-radius:24px;background:#fff}.floating-card{position:absolute;background:#fff;color:#1f2937;border:1px solid rgba(255,255,255,.8);box-shadow:0 14px 34px rgba(31,41,55,.16);border-radius:16px;padding:10px 14px;font-size:13px;font-weight:800}.float-a{left:6px;top:16%}.float-b{right:4px;top:40%}.float-c{left:12%;bottom:10%}.float-d{right:10%;bottom:-10px}.node-overview{margin-top:-44px;position:relative;z-index:3}.node-grid{display:grid;grid-template-columns:1fr;gap:16px}.node-card{background:#fff;border:1px solid var(--border);border-radius:22px;padding:22px;box-shadow:var(--shadow)}.node-card .tag{display:inline-flex;background:#eef5ff;color:var(--blue);border-radius:999px;padding:5px 10px;font-size:12px;font-weight:800;margin-bottom:12px}.node-card h3{margin:0 0 8px;font-size:20px}.node-card p{color:var(--muted);margin:0 0 14px}.split-section{display:grid;grid-template-columns:1fr;gap:28px;align-items:center}.content-panel{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}.image-panel{position:relative;border-radius:30px;background:linear-gradient(180deg,#f8fbff,#eef4ff);padding:22px;border:1px solid var(--border);overflow:hidden}.image-panel img{border-radius:22px;margin:auto}.feature-list{display:grid;gap:12px;margin:22px 0}.feature-list div,.mini-card{background:#f8fafc;border:1px solid var(--border);border-radius:18px;padding:14px}.feature-list strong{display:block;color:#101828}.feature-list p,.mini-card p{margin:4px 0 0;color:var(--muted);font-size:15px}.global-nodes-section{background:linear-gradient(180deg,#fff,#f6f9ff);position:relative;overflow:hidden}.map-panel{border-radius:32px;background:var(--gradient);padding:28px;color:#fff;position:relative;overflow:hidden;min-height:300px}.map-panel:before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 18% 42%,rgba(255,255,255,.95) 0 4px,transparent 5px),radial-gradient(circle at 45% 28%,rgba(255,255,255,.8) 0 3px,transparent 4px),radial-gradient(circle at 72% 55%,rgba(255,255,255,.9) 0 4px,transparent 5px),linear-gradient(28deg,transparent 48%,rgba(255,255,255,.18) 49%,transparent 51%);opacity:.75}.map-panel img{position:relative;z-index:1;border-radius:22px;background:rgba(255,255,255,.1)}.speed-lines{display:grid;gap:14px;margin:20px 0}.speed-line{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--border);border-radius:16px;padding:14px}.speed-line span{width:42px;height:8px;border-radius:999px;background:linear-gradient(90deg,#2980FE,#7B4EF1)}.privacy-protection-section .security-panel{background:#fff;border:1px solid var(--border);border-radius:28px;padding:24px;box-shadow:var(--shadow)}.privacy-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.privacy-tags span{background:#eef5ff;color:#2765d8;border-radius:999px;padding:8px 12px;font-weight:700;font-size:13px}.policy-grid,.device-grid,.protocol-grid,.risk-grid,.faq-grid{display:grid;grid-template-columns:1fr;gap:16px}.policy-card,.device-card,.protocol-card,.risk-card,.faq-item,.step-card,.info-card{background:#fff;border:1px solid var(--border);border-radius:22px;padding:22px;box-shadow:0 12px 28px rgba(31,41,55,.05)}.policy-card h3,.device-card h3,.protocol-card h3,.risk-card h3,.faq-item h3,.step-card h3,.info-card h3{margin:0 0 8px;color:#101828}.policy-card p,.device-card p,.protocol-card p,.risk-card p,.faq-item p,.step-card p,.info-card p{margin:0;color:var(--muted)}.process-steps{display:grid;grid-template-columns:1fr;gap:16px;counter-reset:step}.step-card{position:relative;padding-top:54px}.step-card:before{counter-increment:step;content:counter(step,decimal-leading-zero);position:absolute;top:18px;left:22px;background:var(--blue);color:#fff;border-radius:999px;padding:4px 10px;font-size:12px;font-weight:800}.risk-card{border-left:4px solid var(--blue)}.cta-section{background:var(--gradient);color:#fff;border-radius:32px;padding:44px 24px;text-align:center;position:relative;overflow:hidden}.cta-section h2{font-size:clamp(28px,5vw,42px);line-height:1.2;margin:0 0 12px}.cta-section p{color:rgba(255,255,255,.88);margin:0 auto 24px;max-width:720px}.page-hero{background:linear-gradient(180deg,#eef5ff,#fff);padding:54px 0 36px}.simple-hero h1{font-size:clamp(32px,6vw,52px);line-height:1.15;margin:12px 0;color:#101828}.simple-hero p{font-size:18px;color:var(--muted);max-width:760px;margin:0}.category-badge{background:#eef5ff;color:var(--blue);padding:7px 12px}.article-layout{display:grid;grid-template-columns:1fr;gap:22px;padding:42px 0 68px}.article-card{background:#fff;border:1px solid var(--border);border-radius:28px;padding:26px;box-shadow:var(--shadow)}.article-card h2{font-size:26px;margin:0 0 12px}.article-card h3{font-size:21px;margin:28px 0 10px}.article-card p{color:#4b5563;margin:0 0 16px}.article-card ul,.article-card ol{margin:12px 0 22px;padding-left:20px;color:#4b5563}.article-card li{margin:8px 0}.article-card .download-btn{margin-top:12px}.side-panel{background:#f8fafc;border:1px solid var(--border);border-radius:24px;padding:22px;align-self:start}.side-panel h3{margin:0 0 12px}.side-panel a{display:block;color:var(--blue);font-weight:700;margin:10px 0}.check-panel,.tip-panel{background:#f8fbff;border:1px solid #dce9ff;border-radius:22px;padding:18px;margin:20px 0}.check-panel h3,.tip-panel h3{margin:0 0 8px}.cards-2{display:grid;grid-template-columns:1fr;gap:16px;margin:20px 0}.download-steps{display:grid;gap:14px;counter-reset:download}.download-steps .step{background:#fff;border:1px solid var(--border);border-radius:20px;padding:18px 18px 18px 58px;position:relative}.download-steps .step:before{counter-increment:download;content:counter(download);position:absolute;left:18px;top:18px;width:28px;height:28px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:800}.site-footer{background:#101828;color:#d0d5dd;padding:48px 0 22px}.footer-grid{display:grid;grid-template-columns:1fr;gap:26px}.footer-grid h3{color:#fff;margin:0 0 12px}.footer-grid a{display:block;color:#d0d5dd;margin:8px 0}.footer-grid a:hover{color:#fff}.footer-brand{color:#fff;margin-bottom:12px}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:18px;color:#98a2b3;font-size:14px}
@media (max-width: 860px){
  .nav-toggle-label{display:flex;flex-direction:column;gap:5px;width:42px;height:42px;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:14px}.nav-toggle-label span{width:20px;height:2px;background:#1f2937;border-radius:2px}.main-nav{position:absolute;left:16px;right:16px;top:68px;background:#fff;border:1px solid var(--border);border-radius:20px;padding:12px;box-shadow:var(--shadow);display:none;align-items:stretch}.main-nav a{display:block;width:100%;padding:12px 14px}.nav-toggle:checked ~ .main-nav{display:block}.floating-card{position:static;display:inline-flex;margin:8px 6px 0 0}.hero-visual{padding-bottom:12px}.header-inner{position:relative}.section{padding:48px 0}.cta-section{border-radius:24px}
}
@media (min-width: 700px){
  .node-grid{grid-template-columns:repeat(2,1fr)}.policy-grid,.device-grid,.protocol-grid,.risk-grid,.faq-grid,.cards-2{grid-template-columns:repeat(2,1fr)}.process-steps{grid-template-columns:repeat(2,1fr)}.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}
}
@media (min-width: 960px){
  .hero-grid{grid-template-columns:1.05fr .95fr}.split-section{grid-template-columns:1fr 1fr}.split-section.reverse .content-panel{order:2}.node-grid{grid-template-columns:repeat(4,1fr)}.policy-grid,.device-grid,.protocol-grid{grid-template-columns:repeat(3,1fr)}.risk-grid{grid-template-columns:repeat(4,1fr)}.process-steps{grid-template-columns:repeat(3,1fr)}.article-layout{grid-template-columns:minmax(0,1fr) 300px}.article-layout.wide{grid-template-columns:1fr}.article-card{padding:36px}.vpn-network-hero{padding:92px 0 104px}.page-hero{padding:72px 0 48px}
}