*{box-sizing:border-box}
:root{--primary:#2980FE;--primary-dark:#1768E8;--text:#1f2937;--muted:#64748b;--light:#f6f8fc;--line:#e5eaf3;--deep:#111827;--gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);--radius:24px;--shadow:0 18px 48px rgba(31,41,55,.10)}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;background:#fff;color:var(--text);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:20;background:rgba(255,255,255,.92);backdrop-filter:blur(16px);border-bottom:1px solid rgba(229,234,243,.8)}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:18px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;color:#162033;font-size:20px}
.logo img,.footer-brand img{width:38px;height:38px;border-radius:12px;object-fit:cover;box-shadow:0 8px 22px rgba(41,128,254,.22)}
.responsive-nav{display:none;align-items:center;gap:4px}
.responsive-nav a{padding:10px 12px;border-radius:999px;color:#475569;font-weight:650;font-size:14px;white-space:nowrap}
.responsive-nav a:hover,.responsive-nav a.active{background:#eef5ff;color:var(--primary)}
.nav-toggle{position:absolute;opacity:0;pointer-events:none}
.mobile-nav{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:999px;padding:9px 14px;color:#334155;background:#fff;font-weight:700;cursor:pointer}
.nav-toggle:checked~.responsive-nav{display:flex;position:absolute;left:16px;right:16px;top:72px;flex-direction:column;align-items:stretch;background:#fff;border:1px solid var(--line);border-radius:18px;padding:10px;box-shadow:var(--shadow)}
.nav-toggle:checked~.responsive-nav a{border-radius:12px}
.gradient-bg{background:var(--gradient);color:#fff}
.content-container{width:min(880px,calc(100% - 32px));margin:0 auto}
.section{padding:72px 0}
.section-soft{background:#f7f9fd}
.section-title{font-size:30px;line-height:1.25;margin:0 0 14px;color:#111827;letter-spacing:-.02em}
.section-desc{margin:0 0 26px;color:var(--muted)}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 24px;border-radius:999px;background:#2980FE;color:#fff!important;font-weight:800;box-shadow:0 14px 30px rgba(41,128,254,.28);transition:.2s ease;border:0}
.download-btn:hover{background:#1768E8;transform:translateY(-1px)}
.text-link{display:inline-flex;align-items:center;gap:6px;color:#1e6eea;font-weight:800}
.badge,.category-badge{display:inline-flex;align-items:center;gap:8px;border-radius:999px;background:#eef5ff;color:#196dde;padding:7px 12px;font-weight:800;font-size:13px}
.vpn-network-hero{position:relative;overflow:hidden;padding:74px 0 86px;background:var(--gradient);color:#fff}
.vpn-network-hero:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 78% 18%,rgba(255,255,255,.24),transparent 28%),radial-gradient(circle at 20% 72%,rgba(255,255,255,.16),transparent 28%)}
.vpn-network-hero:after{content:"";position:absolute;inset:0;background-image:linear-gradient(135deg,rgba(255,255,255,.16) 1px,transparent 1px),radial-gradient(circle,rgba(255,255,255,.35) 1.5px,transparent 2px);background-size:84px 84px,96px 96px;opacity:.28}
.hero-grid{position:relative;z-index:2;display:grid;gap:32px;align-items:center}
.hero-copy h1{font-size:40px;line-height:1.12;margin:0 0 18px;letter-spacing:-.04em}
.hero-copy p{font-size:17px;color:rgba(255,255,255,.88);margin:0 0 24px}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.hero-tags span{border:1px solid rgba(255,255,255,.25);background:rgba(255,255,255,.12);border-radius:999px;padding:8px 12px;font-weight:700;font-size:13px}
.hero-visual{position:relative;min-height:330px;display:flex;align-items:center;justify-content:center}
.hero-device{width:min(430px,92%);border-radius:32px;filter:drop-shadow(0 28px 42px rgba(0,0,0,.25))}
.status-pill{position:absolute;border-radius:18px;background:rgba(255,255,255,.92);color:#162033;box-shadow:0 16px 34px rgba(0,0,0,.18);padding:10px 14px;font-weight:800;font-size:13px}
.status-a{top:24px;left:0}.status-b{top:78px;right:6px}.status-c{bottom:74px;left:10px}.status-d{bottom:22px;right:18px}
.node-overview{margin-top:-42px;position:relative;z-index:3}
.node-overview-grid{display:grid;gap:16px}
.node-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 15px 38px rgba(31,41,55,.08)}
.node-card .mini-label{display:inline-flex;background:#eef5ff;color:#2980FE;border-radius:999px;padding:5px 10px;font-size:12px;font-weight:900;margin-bottom:12px}
.node-card h3{margin:0 0 8px;font-size:19px;color:#111827}
.node-card p{margin:0 0 14px;color:#64748b}
.vpn-connection-section,.global-nodes-section,.high-speed-section,.privacy-protection-section,.multi-device-section,.encryption-protocol-section{display:grid;gap:28px;align-items:center}
.feature-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:0 16px 42px rgba(31,41,55,.08)}
.feature-panel ul{padding-left:20px;margin:18px 0;color:#475569}
.feature-image-card{border-radius:30px;background:#fff;padding:18px;box-shadow:var(--shadow);border:1px solid rgba(229,234,243,.8)}
.global-nodes-wrap{background:linear-gradient(135deg,#f7fbff 0%,#eef5ff 100%);border:1px solid #dbeafe;border-radius:30px;padding:28px;position:relative;overflow:hidden}
.global-nodes-wrap:before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle,#2980FE 2px,transparent 2px),linear-gradient(90deg,rgba(41,128,254,.10) 1px,transparent 1px);background-size:82px 82px,82px 82px;opacity:.32}
.global-nodes-wrap>*{position:relative}
.speed-lines{display:grid;gap:12px;margin-top:18px}
.speed-line{background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px;display:flex;justify-content:space-between;gap:12px;color:#475569}
.speed-line strong{color:#111827}
.privacy-board{background:#fff;border:1px solid var(--line);border-radius:30px;padding:24px;box-shadow:var(--shadow)}
.privacy-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.privacy-tags span{border-radius:999px;background:#f1f5f9;color:#334155;padding:8px 12px;font-weight:750;font-size:13px}
.no-log-policy-section{display:grid;gap:18px}
.policy-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 14px 36px rgba(31,41,55,.07)}
.device-grid{display:grid;gap:14px}
.device-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px}
.protocol-grid{display:grid;gap:16px}
.protocol-card{background:#111827;color:#fff;border-radius:24px;padding:22px;position:relative;overflow:hidden}
.protocol-card:after{content:"";position:absolute;right:-40px;top:-40px;width:140px;height:140px;border-radius:50%;background:rgba(41,128,254,.28)}
.protocol-card p{color:#dbe4f0}
.safety-panel{background:#fff;border:1px solid var(--line);border-radius:26px;padding:24px;box-shadow:0 12px 34px rgba(31,41,55,.07)}
.process-steps{display:grid;gap:16px;counter-reset:step}
.step-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px 22px 22px 66px;box-shadow:0 12px 32px rgba(31,41,55,.06)}
.step-card:before{counter-increment:step;content:counter(step);position:absolute;left:20px;top:22px;width:34px;height:34px;border-radius:12px;background:#eef5ff;color:#2980FE;display:flex;align-items:center;justify-content:center;font-weight:900}
.step-card h3{margin:0 0 6px}
.step-card p{margin:0 0 10px;color:#64748b}
.risk-grid{display:grid;gap:16px}
.risk-card{background:#fff;border:1px solid var(--line);border-left:4px solid #2980FE;border-radius:20px;padding:18px;box-shadow:0 12px 30px rgba(31,41,55,.06)}
.risk-card h3{margin:0 0 6px;font-size:18px}.risk-card p{margin:0 0 8px;color:#64748b}
.faq-list{display:grid;gap:14px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:20px;padding:20px}
.faq-item h3{margin:0 0 8px;color:#111827;font-size:18px}
.faq-item p{margin:0;color:#64748b}
.cta-section{padding:68px 0;background:var(--gradient);color:#fff;text-align:center;position:relative;overflow:hidden}
.cta-section:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 22% 20%,rgba(255,255,255,.22),transparent 28%),radial-gradient(circle at 80% 70%,rgba(255,255,255,.18),transparent 30%)}
.cta-section .container{position:relative}
.cta-section h2{font-size:31px;line-height:1.25;margin:0 0 12px}.cta-section p{margin:0 auto 22px;color:rgba(255,255,255,.88);max-width:720px}
.page-hero{padding:58px 0 38px;background:linear-gradient(180deg,#f8fbff 0%,#fff 100%);border-bottom:1px solid var(--line)}
.page-hero h1{font-size:34px;line-height:1.2;margin:16px 0 14px;color:#111827;letter-spacing:-.03em}
.page-hero p{margin:0;color:#64748b;font-size:17px;max-width:760px}
.article-layout{display:grid;gap:24px;align-items:start}
.article-main{background:#fff;border:1px solid var(--line);border-radius:26px;padding:24px;box-shadow:0 14px 34px rgba(31,41,55,.06)}
.article-main h2{margin:8px 0 12px;color:#111827}
.article-main p{color:#475569}
.article-main ul,.article-main ol{color:#475569;padding-left:22px}
.side-panel{background:#f8fafc;border:1px solid var(--line);border-radius:24px;padding:22px}
.side-panel h3{margin-top:0}.side-panel a{display:block;color:#1e6eea;font-weight:800;margin:9px 0}
.article-download{padding-top:8px;margin-top:24px;border-top:1px solid var(--line)}
.check-grid{display:grid;gap:12px;margin:20px 0}
.check-card{background:#f8fbff;border:1px solid #dbeafe;border-radius:18px;padding:16px}
.check-card strong{display:block;color:#111827;margin-bottom:4px}
.table-like{display:grid;gap:12px}
.table-row{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px}
.table-row strong{display:block;color:#111827}
.download-steps{display:grid;gap:14px;margin:26px 0}
.download-step{display:flex;gap:14px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px}
.download-step span{flex:0 0 34px;height:34px;border-radius:12px;background:#eef5ff;color:#2980FE;font-weight:900;display:flex;align-items:center;justify-content:center}
.site-footer{background:#0f172a;color:#cbd5e1;padding:54px 0 24px}
.footer-grid{display:grid;gap:24px}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:900;font-size:20px;margin-bottom:12px}
.site-footer h3{color:#fff;margin:0 0 12px}.site-footer a{display:block;color:#cbd5e1;margin:8px 0}.site-footer a:hover{color:#fff}
.footer-bottom{margin-top:28px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-size:14px;color:#94a3b8}
@media (min-width:700px){
  .node-overview-grid{grid-template-columns:repeat(2,1fr)}
  .risk-grid{grid-template-columns:repeat(2,1fr)}
  .process-steps{grid-template-columns:repeat(2,1fr)}
  .device-grid{grid-template-columns:repeat(3,1fr)}
  .protocol-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1.2fr 1fr 1fr 1fr}
}
@media (min-width:960px){
  .mobile-nav{display:none}
  .responsive-nav{display:flex}
  .hero-grid{grid-template-columns:1.05fr .95fr}
  .hero-copy h1{font-size:58px}
  .node-overview-grid{grid-template-columns:repeat(4,1fr)}
  .vpn-connection-section,.global-nodes-section,.high-speed-section,.privacy-protection-section,.multi-device-section,.encryption-protocol-section{grid-template-columns:1fr 1fr}
  .no-log-policy-section{grid-template-columns:repeat(3,1fr)}
  .article-layout{grid-template-columns:minmax(0,1fr) 300px}
  .risk-grid{grid-template-columns:repeat(4,1fr)}
  .process-steps{grid-template-columns:repeat(3,1fr)}
  .section{padding:88px 0}
}
@media (max-width:420px){
  .container,.content-container{width:min(100% - 24px,1120px)}
  .hero-copy h1{font-size:34px}
  .section-title,.cta-section h2{font-size:26px}
  .page-hero h1{font-size:30px}
  .status-pill{position:static;margin:8px;display:inline-flex}
  .hero-visual{display:block;text-align:center}
  .hero-device{margin:0 auto 10px}
  .download-btn{width:100%}
}