:root{
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue:#2980FE;
  --blue-dark:#1768E8;
  --text:#20263A;
  --muted:#677086;
  --soft:#F4F7FB;
  --line:#E7ECF4;
  --card:#FFFFFF;
  --deep:#111827;
  --radius:28px;
  --shadow:0 18px 45px rgba(37, 61, 120, .12);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","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%;height:auto;display:block}
.container{
  width:min(1120px, calc(100% - 36px));
  margin:0 auto;
}
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter: blur(18px);
  border-bottom:1px solid rgba(231,236,244,.78);
}
.nav-shell{
  width:min(1180px, calc(100% - 30px));
  min-height:72px;
  margin:0 auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  letter-spacing:.02em;
  color:#172033;
  white-space:nowrap;
}
.brand img{
  width:40px;
  height:40px;
  border-radius:12px;
  object-fit:cover;
  box-shadow:0 8px 22px rgba(41,128,254,.22);
}
.nav-toggle{
  border:1px solid var(--line);
  background:#fff;
  border-radius:999px;
  padding:9px 14px;
  color:var(--text);
  font-weight:700;
}
.main-nav{
  position:absolute;
  left:18px;
  right:18px;
  top:74px;
  display:none;
  flex-direction:column;
  gap:6px;
  padding:14px;
  border:1px solid var(--line);
  border-radius:22px;
  background:#fff;
  box-shadow:var(--shadow);
}
.main-nav.is-open{display:flex}
.main-nav a{
  padding:10px 12px;
  border-radius:14px;
  color:#42506A;
  font-weight:600;
  font-size:14px;
}
.main-nav a:hover{background:var(--soft);color:var(--blue)}
.section{padding:58px 0}
.section-soft{background:linear-gradient(180deg,#F7FAFF 0%,#FFFFFF 100%)}
.section-title{
  max-width:760px;
  margin:0 auto 28px;
  text-align:center;
}
.section-title .eyebrow,.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 12px;
  border-radius:999px;
  background:#EEF5FF;
  color:var(--blue);
  font-size:13px;
  font-weight:800;
}
.section-title h2,.page-title h1{
  margin:14px 0 10px;
  font-size:clamp(28px,5vw,46px);
  line-height:1.16;
  color:#141B2D;
}
.section-title p,.page-title p{margin:0;color:var(--muted)}
.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:800;
  box-shadow:0 14px 26px rgba(41,128,254,.25);
  transition:.2s ease;
}
.download-btn:hover{
  background:var(--blue-dark);
  transform:translateY(-2px);
}
.text-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--blue);
  font-weight:800;
}
.vpn-saas-hero{
  position:relative;
  overflow:hidden;
  padding:42px 0 64px;
  color:#fff;
  background:var(--gradient);
}
.vpn-saas-hero:after{
  content:"";
  position:absolute;
  left:-10%;
  right:-10%;
  bottom:-96px;
  height:160px;
  background:#fff;
  transform:skewY(-4deg);
  transform-origin:left top;
}
.hero-grid{
  position:relative;
  z-index:2;
  display:grid;
  gap:32px;
  align-items:center;
}
.hero-copy h1{
  margin:16px 0 16px;
  font-size:clamp(36px,8vw,64px);
  line-height:1.05;
  letter-spacing:-.04em;
}
.hero-copy p{
  max-width:670px;
  margin:0 0 24px;
  color:rgba(255,255,255,.88);
  font-size:17px;
}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.hero-tags,.floating-tags,.mini-tags{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:22px;
}
.hero-tags span,.mini-tags span{
  padding:8px 12px;
  border-radius:999px;
  background:rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.25);
  font-size:13px;
  font-weight:700;
}
.hero-visual{
  position:relative;
  min-height:320px;
  border-radius:36px;
  padding:22px;
  background:rgba(255,255,255,.13);
  border:1px solid rgba(255,255,255,.2);
  box-shadow:0 30px 70px rgba(20,23,65,.24);
}
.hero-visual img{
  width:100%;
  border-radius:28px;
  object-fit:cover;
}
.float-card{
  position:absolute;
  padding:10px 13px;
  border-radius:16px;
  background:rgba(255,255,255,.9);
  color:#263044;
  font-size:13px;
  font-weight:800;
  box-shadow:0 14px 32px rgba(21,33,70,.16);
}
.f1{left:18px;top:22px}.f2{right:18px;top:82px}.f3{left:24px;bottom:58px}.f4{right:28px;bottom:18px}
.product-highlights{
  position:relative;
  z-index:3;
  margin-top:-34px;
}
.highlights-grid{
  display:grid;
  gap:16px;
}
.highlight-card,.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:24px;
  padding:22px;
  box-shadow:0 12px 32px rgba(37,61,120,.08);
}
.highlight-card span{
  display:inline-flex;
  padding:6px 10px;
  border-radius:999px;
  background:#EEF5FF;
  color:var(--blue);
  font-size:12px;
  font-weight:800;
}
.highlight-card h3,.card h3{margin:14px 0 8px;color:#172033}
.highlight-card p,.card p{margin:0 0 12px;color:var(--muted)}
.feature-split,.image-split{
  display:grid;
  gap:24px;
  align-items:center;
}
.feature-panel{
  border-radius:var(--radius);
  padding:28px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:var(--shadow);
}
.feature-panel h2{
  margin:10px 0 12px;
  font-size:clamp(28px,5vw,42px);
  line-height:1.18;
}
.feature-panel p{color:var(--muted);margin:0 0 18px}
.feature-list{
  display:grid;
  gap:10px;
  margin:18px 0 20px;
  padding:0;
  list-style:none;
}
.feature-list li{
  padding:12px 14px;
  border-radius:16px;
  background:#F6F9FE;
  border:1px solid #ECF1F8;
  color:#41506B;
}
.visual-card{
  border-radius:34px;
  padding:18px;
  background:linear-gradient(180deg,#FFFFFF,#F4F8FF);
  border:1px solid var(--line);
  box-shadow:var(--shadow);
}
.visual-card img{border-radius:24px}
.high-speed-section{
  background:linear-gradient(180deg,#F7FAFF,#EEF5FF);
}
.speed-card{
  display:grid;
  gap:18px;
  padding:24px;
  border-radius:34px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:var(--shadow);
}
.metric-row{
  display:grid;
  grid-template-columns:1fr;
  gap:12px;
}
.metric{
  border-radius:20px;
  background:#F7FAFF;
  border:1px solid #E7ECF4;
  padding:18px;
}
.metric strong{display:block;color:#16203A;font-size:24px}
.metric span{color:var(--muted);font-size:14px}
.nodes-layout{
  display:grid;
  gap:20px;
  align-items:center;
}
.node-list{
  display:grid;
  gap:12px;
}
.node-item{
  display:flex;
  gap:12px;
  padding:16px;
  border-radius:20px;
  background:#fff;
  border:1px solid var(--line);
}
.node-dot{
  width:12px;
  height:12px;
  flex:0 0 12px;
  border-radius:50%;
  margin-top:8px;
  background:var(--blue);
  box-shadow:0 0 0 6px rgba(41,128,254,.1);
}
.privacy-protection-section{
  background:#F8FAFE;
}
.privacy-board{
  display:grid;
  gap:18px;
  padding:22px;
  border-radius:34px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:var(--shadow);
}
.privacy-cards,.policy-grid,.protocol-grid,.risk-grid,.faq-grid{
  display:grid;
  gap:16px;
}
.privacy-card,.policy-card,.protocol-card,.risk-card,.faq-item{
  padding:20px;
  border-radius:22px;
  background:#fff;
  border:1px solid var(--line);
}
.privacy-card{background:#F8FBFF}
.policy-card{
  border-top:4px solid var(--blue);
}
.multi-device-section .device-board{
  display:grid;
  gap:18px;
  padding:22px;
  border-radius:34px;
  background:linear-gradient(135deg,#FFFFFF 0%,#F4F8FF 100%);
  border:1px solid var(--line);
  box-shadow:var(--shadow);
}
.device-cards{
  display:grid;
  gap:14px;
}
.device-pill{
  padding:16px;
  border-radius:20px;
  background:#fff;
  border:1px solid var(--line);
}
.encryption-protocol-section{
  background:linear-gradient(180deg,#FFFFFF,#F8FAFE);
}
.protocol-card{
  background:#F7FAFF;
}
.process-steps{
  display:grid;
  gap:16px;
  counter-reset:steps;
}
.step-card{
  position:relative;
  padding:22px;
  border-radius:24px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:0 10px 28px rgba(37,61,120,.07);
}
.step-number{
  display:inline-flex;
  width:38px;
  height:38px;
  align-items:center;
  justify-content:center;
  border-radius:14px;
  background:var(--gradient);
  color:#fff;
  font-weight:900;
}
.step-card h3{margin:14px 0 6px}
.step-card p{margin:0 0 12px;color:var(--muted)}
.safety-panel{
  padding:26px;
  border-radius:34px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:var(--shadow);
}
.risk-card{
  border-left:4px solid var(--blue);
}
.risk-card h3,.faq-item h3{margin:0 0 8px}
.risk-card p,.faq-item p{margin:0;color:var(--muted)}
.cta-section{
  padding:62px 0;
}
.cta-box{
  text-align:center;
  border-radius:36px;
  padding:42px 24px;
  color:#fff;
  background:var(--gradient);
  box-shadow:0 26px 70px rgba(69,82,210,.2);
}
.cta-box h2{
  margin:0 0 12px;
  font-size:clamp(28px,5vw,44px);
}
.cta-box p{
  max-width:680px;
  margin:0 auto 22px;
  color:rgba(255,255,255,.86);
}
.page-hero{
  padding:44px 0 30px;
  background:linear-gradient(180deg,#F4F8FF,#FFFFFF);
}
.page-title{
  max-width:820px;
}
.page-title h1{
  text-align:left;
}
.content-layout{
  display:grid;
  gap:24px;
  align-items:start;
}
.article-panel{
  padding:26px;
  border-radius:30px;
  background:#fff;
  border:1px solid var(--line);
  box-shadow:var(--shadow);
}
.article-panel h2{margin:18px 0 10px;color:#172033}
.article-panel p{color:var(--muted);margin:0 0 14px}
.side-panel{
  padding:22px;
  border-radius:26px;
  background:#F7FAFF;
  border:1px solid var(--line);
}
.side-panel h2,.side-panel h3{margin-top:0}
.check-list,.number-list{
  display:grid;
  gap:10px;
  padding:0;
  margin:16px 0;
  list-style:none;
}
.check-list li,.number-list li{
  padding:12px 14px;
  border-radius:16px;
  background:#fff;
  border:1px solid var(--line);
  color:#42506A;
}
.notice-box{
  margin:18px 0;
  padding:18px;
  border-radius:20px;
  background:#F7FAFF;
  border-left:4px solid var(--blue);
  color:#44516A;
}
.related-links{
  display:grid;
  gap:10px;
  margin-top:16px;
}
.related-links a{
  padding:12px 14px;
  border-radius:16px;
  background:#fff;
  border:1px solid var(--line);
  color:var(--blue);
  font-weight:800;
}
.download-area{
  margin-top:24px;
  padding-top:20px;
  border-top:1px solid var(--line);
}
.download-steps{
  display:grid;
  gap:14px;
  margin-top:20px;
}
.download-step{
  padding:18px;
  border-radius:20px;
  background:#F7FAFF;
  border:1px solid var(--line);
}
.site-footer{
  padding:46px 0 24px;
  background:#111827;
  color:#CBD5E1;
}
.footer-grid{
  display:grid;
  gap:24px;
}
.footer-brand{
  color:#fff;
  font-weight:900;
  font-size:22px;
  margin-bottom:10px;
}
.site-footer h2{
  color:#fff;
  font-size:16px;
  margin:0 0 12px;
}
.site-footer a{
  display:block;
  color:#CBD5E1;
  margin:8px 0;
}
.site-footer p{margin:0;color:#AAB6C8}
.footer-bottom{
  margin-top:28px;
  padding-top:20px;
  border-top:1px solid rgba(255,255,255,.1);
  color:#94A3B8;
  font-size:14px;
}
@media (min-width: 680px){
  .highlights-grid,.privacy-cards,.policy-grid,.protocol-grid,.risk-grid,.faq-grid,.device-cards,.metric-row{
    grid-template-columns:repeat(2,1fr);
  }
  .process-steps{
    grid-template-columns:repeat(2,1fr);
  }
  .footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr}
}
@media (min-width: 960px){
  .nav-toggle{display:none}
  .main-nav{
    position:static;
    display:flex;
    flex-direction:row;
    align-items:center;
    padding:0;
    border:0;
    box-shadow:none;
    background:transparent;
    gap:4px;
  }
  .main-nav a{font-size:14px}
  .vpn-saas-hero{padding:68px 0 112px}
  .hero-grid{grid-template-columns:1.02fr .98fr;gap:46px}
  .highlights-grid{grid-template-columns:repeat(4,1fr)}
  .feature-split,.image-split,.nodes-layout,.privacy-board,.device-board,.speed-card,.content-layout{
    grid-template-columns:1fr 1fr;
  }
  .content-layout{grid-template-columns:minmax(0,1fr) 320px}
  .speed-card{grid-template-columns:.9fr 1.1fr}
  .protocol-grid{grid-template-columns:repeat(3,1fr)}
  .policy-grid{grid-template-columns:repeat(3,1fr)}
  .risk-grid{grid-template-columns:repeat(3,1fr)}
  .process-steps{grid-template-columns:repeat(3,1fr)}
  .section{padding:78px 0}
}
@media (max-width: 420px){
  .container{width:min(100% - 26px,1120px)}
  .hero-visual{padding:14px;border-radius:28px}
  .feature-panel,.article-panel,.safety-panel{padding:20px;border-radius:24px}
  .float-card{font-size:12px;padding:8px 10px}
  .download-btn{width:100%}
}