:root{
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue:#2980FE;
  --blue-dark:#1768E8;
  --text:#182032;
  --muted:#667085;
  --light:#F6F8FC;
  --line:#E6EAF2;
  --panel:#FFFFFF;
  --soft:#EEF4FF;
  --shadow:0 18px 48px rgba(33, 46, 94, .10);
  --radius:28px;
}
*{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}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(16px);border-bottom:1px solid rgba(230,234,242,.85)}
.nav-wrap{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand,.footer-brand{display:flex;align-items:center;gap:10px;font-weight:800;color:#111827;letter-spacing:.2px}
.logo,.footer-brand img{width:38px;height:38px;border-radius:12px;object-fit:cover;box-shadow:0 8px 20px rgba(41,128,254,.18)}
.main-nav{display:none;position:absolute;left:16px;right:16px;top:72px;background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:14px;grid-template-columns:1fr;gap:4px}
.main-nav a{padding:10px 12px;border-radius:14px;color:#4B5563;font-size:14px;font-weight:650}
.main-nav a:hover,.main-nav a.active{background:var(--soft);color:var(--blue)}
.nav-toggle{position:absolute;opacity:0;pointer-events:none}
.nav-toggle-label{width:44px;height:44px;border:1px solid var(--line);border-radius:14px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;background:#fff}
.nav-toggle-label span{width:20px;height:2px;background:#1F2937;border-radius:99px}
.nav-toggle:checked~.main-nav{display:grid}
.section{padding:72px 0}
.section-soft{background:linear-gradient(180deg,#F7FAFF 0%,#fff 100%)}
.section-title{font-size:clamp(28px,4vw,44px);line-height:1.18;margin:0 0 16px;letter-spacing:-.8px}
.section-lead{max-width:760px;color:var(--muted);margin:0 0 28px;font-size:16px}
.kicker,.category-badge{display:inline-flex;align-items:center;gap:8px;color:var(--blue);background:#EEF5FF;border:1px solid #D9E8FF;border-radius:999px;padding:7px 12px;font-size:13px;font-weight:800;margin-bottom:16px}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 24px;border-radius:999px;background:var(--blue);color:#fff!important;font-weight:800;box-shadow:0 14px 28px rgba(41,128,254,.22);transition:.2s ease;border:0;white-space:nowrap}
.download-btn:hover{background:var(--blue-dark);transform:translateY(-1px)}
.text-link{color:var(--blue);font-weight:800}
.text-link:hover{text-decoration:underline}
.vpn-saas-hero{position:relative;padding:56px 0 72px;overflow:hidden;color:#fff;background:var(--gradient);border-bottom-left-radius:36px;border-bottom-right-radius:36px}
.vpn-saas-hero:after{content:"";position:absolute;left:-8%;right:-8%;bottom:-70px;height:140px;background:#fff;transform:skewY(-3deg);transform-origin:left top}
.hero-grid{position:relative;z-index:1;display:grid;gap:38px;align-items:center}
.hero-copy h1{font-size:clamp(38px,7vw,68px);line-height:1.05;margin:0 0 18px;letter-spacing:-1.4px}
.hero-copy p{font-size:17px;color:rgba(255,255,255,.88);margin:0 0 24px;max-width:680px}
.hero-tags,.floating-tags,.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.hero-tags span,.floating-tags span,.tag-row span{display:inline-flex;border:1px solid rgba(255,255,255,.30);background:rgba(255,255,255,.14);padding:7px 11px;border-radius:999px;font-size:13px;font-weight:700;color:#fff}
.hero-visual{position:relative;min-height:360px;display:flex;align-items:center;justify-content:center}
.product-device{position:relative;width:min(430px,90%);padding:16px;border-radius:36px;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.28);box-shadow:0 30px 80px rgba(16,24,40,.22)}
.product-device img{border-radius:28px;background:#fff;box-shadow:0 20px 50px rgba(16,24,40,.20)}
.floating-card{position:absolute;background:#fff;color:#19243A;border:1px solid rgba(230,234,242,.7);border-radius:18px;padding:10px 14px;box-shadow:0 18px 45px rgba(11,25,62,.16);font-weight:800;font-size:13px}
.floating-card:nth-child(2){left:2%;top:22%}.floating-card:nth-child(3){right:0;top:13%}.floating-card:nth-child(4){left:8%;bottom:18%}.floating-card:nth-child(5){right:4%;bottom:9%}
.product-highlights{margin-top:-34px;position:relative;z-index:3}
.highlight-grid{display:grid;grid-template-columns:1fr;gap:16px}
.highlight-card,.info-card,.risk-card,.faq-card,.step-card,.mini-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:0 12px 32px rgba(17,24,39,.06)}
.highlight-card .label,.info-card .label{display:inline-block;color:var(--blue);font-weight:900;font-size:13px;margin-bottom:10px}
.highlight-card h3,.info-card h3,.risk-card h3,.faq-card h3,.step-card h3,.mini-card h3{margin:0 0 8px;font-size:19px;line-height:1.3}
.highlight-card p,.info-card p,.risk-card p,.faq-card p,.step-card p,.mini-card p{margin:0 0 12px;color:var(--muted)}
.split-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:var(--shadow)}
.feature-panel.gradient-bg{background:linear-gradient(135deg,#F7FAFF,#FFFFFF)}
.feature-points{display:grid;gap:12px;margin-top:18px}
.feature-points div{padding:14px 16px;border:1px solid var(--line);border-radius:18px;background:#FBFCFF;color:#46546A}
.image-card{border-radius:34px;background:#F4F7FF;border:1px solid var(--line);padding:18px;box-shadow:var(--shadow)}
.image-card img{border-radius:26px;background:#fff}
.high-speed-section{background:linear-gradient(180deg,#F7FAFF 0%,#EEF4FF 100%)}
.speed-card{display:grid;gap:20px;background:#fff;border:1px solid var(--line);border-radius:34px;padding:26px;box-shadow:var(--shadow)}
.speed-metrics{display:grid;grid-template-columns:1fr;gap:12px}
.speed-metrics div{padding:16px;border-radius:20px;background:#F6F8FC;border:1px solid var(--line)}
.speed-metrics strong{display:block;font-size:22px;color:var(--blue)}
.nodes-layout{display:grid;gap:18px}
.node-list{display:grid;gap:12px}
.node-list div{border:1px solid var(--line);background:#fff;border-radius:20px;padding:16px}
.privacy-grid,.policy-grid,.device-grid,.protocol-grid,.risk-grid,.faq-grid,.simple-grid,.install-steps{display:grid;grid-template-columns:1fr;gap:16px}
.privacy-protection-section .privacy-shell{background:#fff;border:1px solid var(--line);border-radius:34px;padding:26px;box-shadow:var(--shadow)}
.policy-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:0 12px 32px rgba(17,24,39,.06);border-top:4px solid var(--blue)}
.device-panel{background:linear-gradient(135deg,#F8FAFF,#FFFFFF);border:1px solid var(--line);border-radius:34px;padding:26px;box-shadow:var(--shadow)}
.protocol-panel{background:#111827;color:#fff;border-radius:34px;padding:28px;box-shadow:0 24px 60px rgba(17,24,39,.16)}
.protocol-panel p{color:#D7DFEA}.protocol-panel .mini-card{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.16)}.protocol-panel .mini-card p{color:#D7DFEA}
.process-steps{display:grid;grid-template-columns:1fr;gap:14px;counter-reset:step}
.step-card{position:relative;padding-left:74px;min-height:118px}
.step-card:before{counter-increment:step;content:counter(step);position:absolute;left:22px;top:24px;width:36px;height:36px;border-radius:13px;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:900}
.risk-card{border-left:4px solid var(--blue)}
.cta-section{padding:72px 0;background:var(--gradient);color:#fff;text-align:center;border-top-left-radius:36px;border-top-right-radius:36px}
.cta-section p{color:rgba(255,255,255,.88);max-width:720px;margin:0 auto 22px}
.page-hero{padding:56px 0 34px;background:linear-gradient(180deg,#F5F8FF 0%,#fff 100%)}
.page-hero h1{font-size:clamp(34px,6vw,56px);line-height:1.1;margin:0 0 16px;letter-spacing:-1px}
.page-hero p{color:var(--muted);max-width:760px;margin:0;font-size:17px}
.content-layout{display:grid;gap:24px;align-items:start;padding:34px 0 76px}
.content-main{background:#fff;border:1px solid var(--line);border-radius:30px;padding:24px;box-shadow:var(--shadow)}
.content-main h2{font-size:25px;line-height:1.25;margin:28px 0 10px}.content-main h2:first-child{margin-top:0}.content-main p{color:#4B5563;margin:0 0 16px}.content-main ul,.content-main ol{padding-left:20px;color:#4B5563}.content-main li{margin:8px 0}.content-main .download-zone{margin-top:26px;padding-top:24px;border-top:1px solid var(--line)}
.side-panel{background:#F8FAFF;border:1px solid var(--line);border-radius:26px;padding:22px;position:sticky;top:94px}.side-panel h3{margin:0 0 12px}.side-panel a{display:block;padding:10px 0;color:var(--blue);font-weight:800;border-bottom:1px solid #EAF0FA}.side-panel a:last-child{border-bottom:0}
.notice-box{background:#F6F8FC;border:1px solid var(--line);border-radius:22px;padding:18px;margin:18px 0}.notice-box strong{color:#22314D}
.download-hero{padding:70px 0;background:var(--gradient);color:#fff;border-bottom-left-radius:36px;border-bottom-right-radius:36px}.download-hero h1{font-size:clamp(34px,6vw,58px);line-height:1.1;margin:0 0 16px}.download-hero p{max-width:720px;color:rgba(255,255,255,.88)}
.download-panel{margin-top:-36px;position:relative;z-index:2;background:#fff;border:1px solid var(--line);border-radius:34px;padding:26px;box-shadow:var(--shadow)}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;margin-bottom:14px;box-shadow:0 10px 28px rgba(17,24,39,.05)}.faq-item h2{font-size:20px;margin:0 0 8px}.faq-item p{margin:0;color:#4B5563}
.site-footer{background:#111827;color:#D1D5DB;padding:48px 0 20px}.footer-grid{display:grid;grid-template-columns:1fr;gap:26px}.site-footer h3{font-size:16px;color:#fff;margin:0 0 12px}.site-footer a{display:block;color:#D1D5DB;margin:8px 0}.site-footer a:hover{color:#fff}.footer-brand{color:#fff}.footer-brand img{width:34px;height:34px}.site-footer p{max-width:360px;color:#AEB7C6}.footer-bottom{margin-top:28px;padding-top:18px;border-top:1px solid rgba(255,255,255,.10);font-size:14px;color:#AEB7C6}
@media (min-width:640px){
  .highlight-grid,.privacy-grid,.policy-grid,.device-grid,.protocol-grid,.risk-grid,.faq-grid,.simple-grid,.install-steps{grid-template-columns:repeat(2,1fr)}
  .speed-metrics{grid-template-columns:repeat(3,1fr)}
}
@media (min-width:900px){
  .nav-toggle-label{display:none}.main-nav{position:static;display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;background:transparent;border:0;box-shadow:none;padding:0;gap:4px}.main-nav a{font-size:13px;padding:8px 9px}
  .vpn-saas-hero{padding:88px 0 118px;border-bottom-left-radius:64px;border-bottom-right-radius:64px}.hero-grid{grid-template-columns:1.02fr .98fr}.hero-copy p{font-size:18px}.hero-visual{min-height:450px}.product-highlights{margin-top:-58px}.highlight-grid{grid-template-columns:repeat(4,1fr)}
  .split-section,.speed-card,.nodes-layout,.device-panel{grid-template-columns:1fr 1fr}.privacy-protection-section .privacy-shell{display:grid;grid-template-columns:1.05fr .95fr;gap:28px;align-items:center}.policy-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)}
  .content-layout{grid-template-columns:minmax(0,1fr)300px}.content-main{padding:34px}.footer-grid{grid-template-columns:1.4fr .8fr .8fr .8fr}.main-nav a:nth-last-child(1){background:#EEF5FF;color:var(--blue)}
}
@media (min-width:1120px){.main-nav a{font-size:14px;padding:9px 11px}.section{padding:88px 0}}