:root{
    --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
    --blue:#2980FE;
    --blue-dark:#1768E8;
    --text:#202638;
    --muted:#667085;
    --light:#F6F8FC;
    --line:#E7ECF3;
    --panel:#FFFFFF;
    --soft:#EEF4FF;
    --radius:28px;
    --shadow:0 18px 45px rgba(32,38,56,.09);
}
*{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%;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(18px);
    border-bottom:1px solid rgba(231,236,243,.85);
}
.header-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:#1B2546;white-space:nowrap}
.logo-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:68px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow)}
.main-nav a{display:block;padding:10px 12px;border-radius:14px;color:#536079;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:grid;place-content:center;gap:5px;background:#fff;cursor:pointer}
.nav-toggle-label span{display:block;width:20px;height:2px;background:#1F2937;border-radius:999px}
.nav-toggle:checked ~ .main-nav{display:block}
.download-btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    min-height:48px;
    padding:12px 24px;
    border-radius:999px;
    background:var(--blue);
    color:#fff;
    font-weight:800;
    box-shadow:0 16px 34px rgba(41,128,254,.26);
    transition:transform .18s ease, background .18s ease, box-shadow .18s ease;
}
.download-btn:hover{background:var(--blue-dark);transform:translateY(-2px);box-shadow:0 18px 38px rgba(23,104,232,.32)}
.section{padding:70px 0}
.section-soft{background:var(--light)}
.section-head{max-width:760px;margin:0 auto 30px;text-align:center}
.section-kicker,.badge{
    display:inline-flex;
    align-items:center;
    gap:6px;
    padding:6px 12px;
    border-radius:999px;
    color:var(--blue);
    background:#EEF5FF;
    font-weight:800;
    font-size:13px;
}
h1,h2,h3{line-height:1.18;margin:0 0 14px;color:#101828}
h1{font-size:clamp(34px,7vw,62px);letter-spacing:-1.3px}
h2{font-size:clamp(27px,4.5vw,42px);letter-spacing:-.6px}
h3{font-size:20px}
p{margin:0 0 14px;color:var(--muted)}
.lead{font-size:18px;color:#EAF0FF;max-width:680px}
.vpn-saas-hero{position:relative;padding:58px 0 76px;background:var(--gradient);overflow:hidden;color:#fff}
.vpn-saas-hero:after{content:"";position:absolute;inset:auto -12% -130px -12%;height:230px;background:#fff;transform:skewY(-5deg);transform-origin:left top}
.vpn-saas-hero .container{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1fr;gap:34px;align-items:center}
.hero-copy h1,.hero-copy p{color:#fff}
.hero-tags{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 28px}
.hero-tags span{padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.24);font-weight:700;font-size:13px;color:#fff}
.hero-visual{position:relative;min-height:330px;border-radius:36px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.22);padding:22px;box-shadow:0 24px 60px rgba(18,28,75,.22)}
.hero-visual img{width:min(420px,100%);margin:auto;border-radius:30px;object-fit:cover}
.float-card{position:absolute;background:rgba(255,255,255,.94);border:1px solid rgba(255,255,255,.8);border-radius:18px;padding:10px 13px;color:#26304A;font-weight:800;font-size:13px;box-shadow:0 12px 35px rgba(20,29,64,.17)}
.float-card.one{left:12px;top:18px}.float-card.two{right:12px;top:78px}.float-card.three{left:20px;bottom:72px}.float-card.four{right:18px;bottom:24px}
.product-highlights{display:grid;grid-template-columns:1fr;gap:16px;margin-top:-42px;position:relative;z-index:3}
.highlight-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:0 16px 40px rgba(34,48,80,.08)}
.highlight-card .tag{display:inline-flex;margin-bottom:12px;padding:5px 10px;border-radius:999px;background:#EEF5FF;color:var(--blue);font-size:12px;font-weight:800}
.highlight-card a,.text-link{color:var(--blue);font-weight:800}
.feature-section{padding:76px 0}
.feature-panel{display:grid;grid-template-columns:1fr;gap:28px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:34px;padding:24px;box-shadow:var(--shadow)}
.feature-panel.reverse .feature-image{order:-1}
.feature-image{border-radius:30px;overflow:hidden;background:linear-gradient(180deg,#F2F6FF,#FFFFFF);padding:18px;border:1px solid #EDF1F8}
.feature-image img{border-radius:24px;width:100%;object-fit:cover}
.feature-list{display:grid;gap:12px;margin:20px 0}
.feature-list div{display:flex;gap:10px;align-items:flex-start;color:#475467}
.feature-list div:before{content:"";width:9px;height:9px;border-radius:50%;background:var(--blue);margin-top:10px;flex:0 0 auto}
.high-speed-section{background:linear-gradient(180deg,#F7FAFF 0%,#FFFFFF 100%)}
.speed-card{display:grid;grid-template-columns:1fr;gap:20px;background:#fff;border:1px solid var(--line);border-radius:34px;padding:24px;box-shadow:var(--shadow)}
.speed-meter{display:grid;gap:14px}
.meter-row{background:#F4F7FB;border-radius:18px;padding:14px;border:1px solid #EAF0F7}
.meter-line{height:8px;border-radius:999px;background:linear-gradient(90deg,#DCE8FF,#2980FE);margin-top:10px}
.global-nodes-section .node-grid{display:grid;grid-template-columns:1fr;gap:18px;margin-top:18px}
.node-card{padding:18px;border-radius:22px;background:#F8FAFD;border:1px solid var(--line)}
.privacy-protection-section{background:#F7F9FC}
.privacy-layout{display:grid;grid-template-columns:1fr;gap:24px;align-items:center}
.privacy-cards{display:grid;grid-template-columns:1fr;gap:14px;margin-top:22px}
.privacy-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:0 10px 26px rgba(32,38,56,.05)}
.no-log-policy-section .policy-grid,.multi-device-section .device-grid,.encryption-protocol-section .protocol-grid{display:grid;grid-template-columns:1fr;gap:16px;margin-top:24px}
.policy-card,.device-card,.protocol-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:0 12px 30px rgba(32,38,56,.06)}
.process-steps{display:grid;grid-template-columns:1fr;gap:16px;counter-reset:step}
.step-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px 22px 22px 76px;box-shadow:0 10px 28px rgba(32,38,56,.055)}
.step-card:before{counter-increment:step;content:counter(step);position:absolute;left:20px;top:22px;width:40px;height:40px;border-radius:14px;background:var(--gradient);color:#fff;font-weight:900;display:grid;place-items:center}
.risk-grid{display:grid;grid-template-columns:1fr;gap:16px}
.risk-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:20px;padding:18px;box-shadow:0 10px 24px rgba(32,38,56,.05)}
.faq-list{display:grid;gap:14px;max-width:920px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:0 10px 28px rgba(32,38,56,.045)}
.faq-item h3{font-size:18px;margin-bottom:8px}
.cta-section{padding:72px 0;background:var(--gradient);color:#fff;text-align:center;position:relative;overflow:hidden}
.cta-section:before{content:"";position:absolute;inset:-90px auto auto -100px;width:280px;height:280px;border-radius:50%;background:rgba(255,255,255,.14)}
.cta-section .container{position:relative;z-index:1}
.cta-section h2,.cta-section p{color:#fff}
.cta-section .download-btn{margin-top:14px;background:#2980FE;color:#fff}
.page-hero{padding:64px 0 34px;background:linear-gradient(180deg,#F4F7FF 0%,#FFFFFF 100%)}
.page-hero-inner{max-width:860px}
.page-hero h1{font-size:clamp(32px,5vw,52px)}
.page-content{padding:40px 0 76px}
.content-grid{display:grid;grid-template-columns:1fr;gap:24px;align-items:start}
.article-panel{background:#fff;border:1px solid var(--line);border-radius:30px;padding:24px;box-shadow:var(--shadow)}
.aside-panel{background:#F8FAFE;border:1px solid var(--line);border-radius:26px;padding:22px;position:sticky;top:92px}
.info-grid{display:grid;grid-template-columns:1fr;gap:14px;margin:24px 0}
.info-card{background:#F8FAFD;border:1px solid var(--line);border-radius:20px;padding:18px}
.check-list{display:grid;gap:10px;margin:18px 0;padding:0;list-style:none}
.check-list li{display:flex;gap:10px;align-items:flex-start;color:#475467}
.check-list li:before{content:"✓";display:grid;place-items:center;width:22px;height:22px;border-radius:8px;background:#EAF3FF;color:var(--blue);font-weight:900;flex:0 0 auto;margin-top:2px}
.notice-box{background:#F3F7FF;border:1px solid #DCE8FF;border-radius:22px;padding:18px;margin:20px 0;color:#475467}
.download-only-card{text-align:center;max-width:760px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:34px;padding:30px;box-shadow:var(--shadow)}
.install-steps{display:grid;grid-template-columns:1fr;gap:14px;margin:24px 0;text-align:left}
.install-step{background:#F8FAFD;border:1px solid var(--line);border-radius:20px;padding:18px}
.site-footer{background:#111827;color:#D5DAE4;padding:56px 0 22px}
.footer-grid{display:grid;grid-template-columns:1fr;gap:28px}
.footer-grid p{color:#AAB2C2}.footer-grid h3{color:#fff;font-size:16px}.footer-grid a{display:block;color:#C7D0DF;margin:8px 0;font-size:14px}.footer-grid a:hover{color:#fff}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;margin-bottom:12px}.footer-brand img{width:36px;height:36px;border-radius:12px;object-fit:cover}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:34px;padding-top:18px;display:flex;flex-direction:column;gap:8px;color:#9CA3AF;font-size:13px}
@media (min-width:700px){
    .product-highlights{grid-template-columns:repeat(2,1fr)}
    .policy-grid,.device-grid,.protocol-grid,.privacy-cards,.info-grid{grid-template-columns:repeat(2,1fr)}
    .risk-grid{grid-template-columns:repeat(2,1fr)}
    .process-steps{grid-template-columns:repeat(2,1fr)}
    .footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}
    .footer-bottom{flex-direction:row;justify-content:space-between}
}
@media (min-width:980px){
    .nav-toggle-label{display:none}
    .main-nav{display:flex;position:static;align-items:center;gap:2px;padding:0;background:transparent;border:0;box-shadow:none;border-radius:0}
    .main-nav a{padding:9px 10px;font-size:13px}
    .hero-grid{grid-template-columns:1.02fr .98fr;gap:56px}
    .vpn-saas-hero{padding:86px 0 128px}
    .product-highlights{grid-template-columns:repeat(4,1fr)}
    .feature-panel,.speed-card,.privacy-layout{grid-template-columns:1fr 1fr;padding:34px}
    .feature-panel.reverse .feature-image{order:0}
    .global-nodes-section .node-grid{grid-template-columns:repeat(3,1fr)}
    .policy-grid,.device-grid,.protocol-grid{grid-template-columns:repeat(3,1fr)}
    .risk-grid{grid-template-columns:repeat(4,1fr)}
    .content-grid{grid-template-columns:minmax(0,1fr) 310px}
    .article-panel{padding:34px}
}
@media (min-width:1140px){.main-nav a{font-size:14px;padding:9px 12px}}