:root{
    --gradient:linear-gradient(90deg,#3558F2 0%,#7B4EF1 50%,#B84DDA 100%);
    --blue:#2980FE;
    --blue-hover:#1768E8;
    --dark:#182033;
    --text:#3f4858;
    --muted:#6c7788;
    --line:#e8edf5;
    --soft:#f6f8fc;
    --soft-blue:#f0f6ff;
    --white:#ffffff;
    --shadow:0 18px 48px rgba(34,59,112,.11);
    --radius:24px;
}
*{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:1.72;
    overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
main{background:linear-gradient(180deg,#fff 0%,#f8fbff 58%,#fff 100%)}
.site-header{
    position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
    backdrop-filter:blur(18px);border-bottom:1px solid rgba(232,237,245,.82)
}
.header-inner{max-width:1180px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.logo,.footer-logo{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--dark);font-size:20px;letter-spacing:.02em}
.logo img,.footer-logo img{width:36px;height:36px;border-radius:11px;object-fit:cover}
.nav-toggle{display:none}
.nav-trigger{display:flex;flex-direction:column;gap:5px;cursor:pointer;padding:8px;border:1px solid var(--line);border-radius:12px;background:var(--white)}
.nav-trigger span{width:22px;height:2px;background:var(--dark);border-radius:4px}
.main-nav{position:absolute;left:20px;right:20px;top:66px;display:none;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:20px;padding:10px;box-shadow:var(--shadow)}
.nav-toggle:checked~.main-nav{display:flex}
.main-nav a{padding:11px 14px;border-radius:14px;color:#4f5a6d;font-size:15px;font-weight:650}
.main-nav a.active,.main-nav a:hover{background:var(--soft-blue);color:var(--blue)}
.container{width:min(1120px,calc(100% - 40px));margin:0 auto}
.narrow-container{width:min(860px,calc(100% - 40px));margin:0 auto}
.section{padding:68px 0}
.section-title{margin:0 0 14px;color:var(--dark);font-size:clamp(28px,4vw,42px);line-height:1.2;letter-spacing:-.03em}
.section-lead{margin:0;color:var(--muted);font-size:17px;max-width:780px}
.eyebrow,.category-badge{display:inline-flex;align-items:center;gap:8px;margin-bottom:14px;padding:7px 12px;border-radius:999px;background:rgba(41,128,254,.1);color:var(--blue);font-size:13px;font-weight:800}
.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!important;font-weight:800;box-shadow:0 12px 28px rgba(41,128,254,.26);transition:.2s ease}
.download-btn:hover{background:var(--blue-hover);transform:translateY(-2px)}
.text-link{color:var(--blue);font-weight:800}
.text-link:hover{color:var(--blue-hover)}
.vpn-lab-hero{background:var(--gradient);color:#fff;position:relative;overflow:hidden}
.vpn-lab-hero:before{content:"";position:absolute;inset:-30% -20% auto auto;width:520px;height:520px;background:rgba(255,255,255,.16);filter:blur(10px);border-radius:50%}
.hero-inner{position:relative;z-index:2;width:min(1180px,calc(100% - 40px));margin:0 auto;padding:76px 0;display:grid;gap:42px;align-items:center}
.hero-copy h1{font-size:clamp(38px,8vw,68px);line-height:1.05;margin:0 0 18px;letter-spacing:-.055em;color:#fff}
.hero-copy p{font-size:18px;max-width:620px;margin:0 0 26px;color:rgba(255,255,255,.9)}
.hero-tags,.status-tags,.mini-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.hero-tags span,.status-tags span,.mini-tags span{display:inline-flex;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;color:#fff}
.lab-visual{position:relative;min-height:330px;display:flex;align-items:center;justify-content:center}
.lab-panel{background:rgba(255,255,255,.95);border:1px solid rgba(255,255,255,.65);border-radius:34px;padding:22px;box-shadow:0 28px 80px rgba(22,32,65,.28);width:min(440px,100%)}
.lab-panel img{border-radius:26px;background:#eef3ff;margin:auto;max-height:320px;object-fit:contain}
.float-card{position:absolute;background:#fff;color:var(--dark);border:1px solid rgba(255,255,255,.75);box-shadow:0 18px 42px rgba(20,31,62,.22);border-radius:18px;padding:12px 14px;font-size:13px;font-weight:800}
.float-card small{display:block;color:var(--muted);font-weight:650;margin-top:2px}
.float-card.one{top:18px;left:0}.float-card.two{right:0;top:72px}.float-card.three{left:22px;bottom:38px}.float-card.four{right:20px;bottom:6px}
.privacy-summary{margin-top:-34px;position:relative;z-index:4}
.summary-grid{display:grid;gap:18px}
.security-card,.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:0 14px 36px rgba(46,69,116,.07)}
.security-card strong{display:inline-flex;color:var(--blue);font-size:13px;margin-bottom:10px}
.security-card h2,.card h3{margin:0 0 10px;color:var(--dark);font-size:22px;line-height:1.25}
.security-card p,.card p{margin:0 0 14px;color:var(--muted)}
.feature-section{padding:72px 0}
.feature-grid{display:grid;gap:30px;align-items:center}
.feature-media{background:#fff;border:1px solid var(--line);border-radius:34px;padding:22px;box-shadow:var(--shadow)}
.feature-media img{border-radius:26px;margin:auto;max-height:340px;object-fit:contain}
.feature-content{padding:4px 0}
.feature-content h2{margin:0 0 16px;color:var(--dark);font-size:clamp(30px,4.2vw,46px);line-height:1.12;letter-spacing:-.04em}
.feature-content p{font-size:17px;color:var(--muted);margin:0 0 18px}
.check-list{display:grid;gap:10px;margin:22px 0;padding:0;list-style:none}
.check-list li{position:relative;padding-left:28px;color:#4b5567}
.check-list li:before{content:"";position:absolute;left:0;top:11px;width:10px;height:10px;border-radius:50%;background:var(--blue);box-shadow:0 0 0 5px rgba(41,128,254,.12)}
.vpn-connection-section{background:#fff}
.privacy-protection-section{background:linear-gradient(180deg,#f7faff,#fff)}
.privacy-protection-section .safety-panel{margin-top:22px}
.no-log-policy-section{background:#fff}
.global-nodes-section{background:#fff}
.high-speed-section{background:#f5f8fd}
.multi-device-section{background:#fff}
.encryption-protocol-section{background:linear-gradient(180deg,#fff,#f7faff)}
.safety-panel{background:#fff;border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:0 14px 32px rgba(46,69,116,.07)}
.safety-panel h3{margin:0 0 12px;color:var(--dark)}
.panel-grid{display:grid;gap:16px;margin-top:24px}
.panel-item{padding:18px;border:1px solid var(--line);border-radius:20px;background:var(--soft)}
.panel-item h3{margin:0 0 8px;color:var(--dark)}
.panel-item p{margin:0;color:var(--muted)}
.node-list{display:grid;gap:12px;margin-top:18px}
.node-item{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 16px;border:1px solid var(--line);border-radius:18px;background:#fff}
.node-item span:last-child{color:var(--blue);font-weight:800}
.process-steps{display:grid;gap:16px;margin-top:34px}
.step-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 10px 26px rgba(46,69,116,.06)}
.step-num{display:inline-flex;width:36px;height:36px;align-items:center;justify-content:center;border-radius:12px;background:var(--blue);color:#fff;font-weight:900;margin-bottom:14px}
.step-card h3{margin:0 0 8px;color:var(--dark)}
.step-card p{margin:0 0 12px;color:var(--muted)}
.risk-grid{display:grid;gap:16px;margin-top:34px}
.risk-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:20px;padding:20px;box-shadow:0 10px 24px rgba(46,69,116,.06)}
.risk-card h3{margin:0 0 8px;color:var(--dark);font-size:19px}
.risk-card p{margin:0 0 10px;color:var(--muted)}
.risk-card b{color:#39445a}
.faq-list{display:grid;gap:14px;margin-top:28px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:0 10px 24px rgba(46,69,116,.05)}
.faq-item h3{margin:0 0 8px;color:var(--dark);font-size:20px}
.faq-item p{margin:0;color:var(--muted)}
.cta-section{padding:78px 0;background:var(--gradient);color:#fff;text-align:center}
.cta-section h2{font-size:clamp(30px,4.5vw,48px);margin:0 0 14px;color:#fff;letter-spacing:-.04em}
.cta-section p{margin:0 auto 26px;max-width:700px;color:rgba(255,255,255,.9);font-size:17px}
.page-hero{padding:70px 0 38px;background:linear-gradient(180deg,#f3f7ff,#fff)}
.page-hero h1{margin:0 0 16px;color:var(--dark);font-size:clamp(34px,6vw,58px);line-height:1.1;letter-spacing:-.045em}
.page-hero p{margin:0;color:var(--muted);font-size:18px;max-width:820px}
.page-layout{display:grid;gap:28px;width:min(1120px,calc(100% - 40px));margin:0 auto;padding:54px 0 76px}
.article{background:#fff;border:1px solid var(--line);border-radius:28px;padding:26px;box-shadow:var(--shadow)}
.article h2{color:var(--dark);font-size:28px;line-height:1.2;margin:24px 0 12px}
.article h2:first-child{margin-top:0}
.article p{color:var(--text);margin:0 0 16px}
.article ul,.article ol{margin:14px 0 22px;padding-left:22px;color:var(--text)}
.article li{margin:8px 0}
.sidebar{display:grid;gap:16px;align-content:start}
.side-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:0 12px 28px rgba(46,69,116,.06)}
.side-card h3{margin:0 0 10px;color:var(--dark)}
.side-card p,.side-card a{color:var(--muted);margin:0 0 10px;display:block}
.download-panel{margin-top:28px;padding:24px;border-radius:24px;background:var(--soft-blue);border:1px solid #dfeeff}
.download-panel p{margin:0 0 16px;color:#4a5870}
.info-grid{display:grid;gap:16px;margin:22px 0}
.info-box{padding:18px;border-radius:20px;border:1px solid var(--line);background:var(--soft)}
.info-box h3{margin:0 0 8px;color:var(--dark);font-size:19px}
.info-box p{margin:0;color:var(--muted)}
.download-page .download-panel{text-align:center;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow)}
.site-footer{background:#111827;color:#d7dde8}
.footer-inner{width:min(1120px,calc(100% - 40px));margin:0 auto;padding:50px 0;display:grid;gap:32px}
.footer-brand p{margin:16px 0 0;color:#aab4c5;max-width:470px}
.footer-logo{color:#fff}.footer-logo img{background:#fff}
.footer-links{display:grid;gap:24px}
.footer-links h3{margin:0 0 12px;color:#fff;font-size:16px}
.footer-links a{display:block;color:#aab4c5;margin:8px 0;font-size:14px}
.footer-links a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);text-align:center;color:#8f9bad;font-size:13px;padding:18px 20px}
@media (min-width:700px){
    .summary-grid{grid-template-columns:repeat(3,1fr)}
    .panel-grid{grid-template-columns:repeat(3,1fr)}
    .process-steps{grid-template-columns:repeat(2,1fr)}
    .risk-grid{grid-template-columns:repeat(2,1fr)}
    .info-grid{grid-template-columns:repeat(2,1fr)}
    .footer-links{grid-template-columns:repeat(3,1fr)}
}
@media (min-width:920px){
    .nav-trigger{display:none}
    .main-nav{position:static;display:flex;flex-direction:row;background:transparent;border:0;border-radius:0;box-shadow:none;padding:0;align-items:center;gap:2px}
    .main-nav a{font-size:14px;padding:9px 12px}
    .hero-inner{grid-template-columns:1.05fr .95fr;padding:96px 0}
    .feature-grid{grid-template-columns:1fr 1fr;gap:64px}
    .feature-grid.reverse .feature-content{order:2}
    .feature-grid.reverse .feature-media{order:1}
    .process-steps{grid-template-columns:repeat(3,1fr)}
    .risk-grid{grid-template-columns:repeat(4,1fr)}
    .page-layout{grid-template-columns:minmax(0,1fr) 310px;align-items:start}
    .article{padding:38px}
    .footer-inner{grid-template-columns:.9fr 1.1fr}
}
@media (max-width:430px){
    .container,.narrow-container,.hero-inner,.page-layout,.footer-inner{width:min(100% - 28px,1120px)}
    .section,.feature-section{padding:52px 0}
    .hero-inner{padding:58px 0 70px}
    .float-card{position:static;margin:10px 0;width:100%}
    .lab-visual{display:block;min-height:auto}
    .lab-panel{margin-bottom:14px}
    .download-btn{width:100%;padding:14px 18px}
}