/* ===== 快连 VPN · 流光极速·青蓝玻璃风 ===== */
:root {
  --bg: #f5f9fc;
  --bg2: #eaf3f9;
  --bg3: #d9eaf5;
  --card: rgba(255,255,255,0.82);
  --card-solid: #ffffff;
  --border: #d4e5f2;
  --border-light: #e4eef6;
  --text: #091828;
  --text2: #2d4b68;
  --text3: #5a7d9a;
  --cyan: #0ea5e9;
  --cyan-light: #38bdf8;
  --cyan-soft: #e0f5fe;
  --cyan-glow: rgba(14,165,233,0.18);
  --ocean: #0369a1;
  --amber: #f59e0b;
  --amber-soft: #fef3c7;
  --radius: 18px;
  --radius-sm: 12px;
  --radius-xs: 8px;
  --shadow: 0 2px 12px rgba(14,82,116,0.04);
  --shadow-md: 0 8px 30px rgba(14,82,116,0.07);
  --shadow-lg: 0 20px 60px rgba(14,82,116,0.1);
  --trans: 0.3s cubic-bezier(0.4,0,0.2,1);
  --glass: rgba(255,255,255,0.7);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* Nav */
.nav-bar{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  background:var(--glass);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  max-width:1240px;margin:0 auto;padding:0 32px;height:66px;
  display:flex;align-items:center;justify-content:space-between;
}
.nav-brand{display:flex;align-items:center;gap:10px;font-size:19px;font-weight:800;letter-spacing:-0.3px}
.nav-brand img{width:32px;height:32px;border-radius:8px}
.nav-brand .accent{color:var(--cyan)}
.nav-menu{display:flex;align-items:center;gap:2px}
.nav-menu a{padding:9px 18px;border-radius:var(--radius-xs);font-size:14px;font-weight:500;color:var(--text2);transition:all var(--trans)}
.nav-menu a:hover{color:var(--cyan);background:var(--cyan-soft)}
.nav-menu a.btn-nav{background:linear-gradient(135deg,var(--cyan),var(--ocean));color:#fff;font-weight:600;border-radius:10px;padding:10px 22px;box-shadow:0 4px 16px var(--cyan-glow)}
.nav-menu a.btn-nav:hover{transform:translateY(-2px);box-shadow:0 8px 26px rgba(14,165,233,0.3)}
.nav-toggle{display:none;background:none;border:none;color:var(--text);font-size:24px;cursor:pointer}

/* Hero */
.hero{
  padding:150px 0 60px;position:relative;overflow:hidden;
  background:linear-gradient(175deg,#f5f9fc 0%,#edf6fb 30%,#e4f1f9 60%,#f5f9fc 100%);
}
.hero::before{
  content:"";position:absolute;top:-180px;right:-120px;
  width:640px;height:640px;
  background:radial-gradient(circle,rgba(14,165,233,0.08) 0%,transparent 60%);
  pointer-events:none;border-radius:50%;
}
.hero::after{
  content:"";position:absolute;bottom:-100px;left:-80px;
  width:480px;height:320px;
  background:radial-gradient(ellipse,rgba(245,158,11,0.04) 0%,transparent 60%);
  pointer-events:none;border-radius:50%;
}
/* Speed lines background */
.hero .speed-lines{
  position:absolute;inset:0;pointer-events:none;overflow:hidden;
}
.hero .speed-lines span{
  position:absolute;display:block;height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan-light),transparent);
  opacity:0.12;animation:speedLine 3s linear infinite;
}
.hero .speed-lines span:nth-child(1){top:12%;width:300px;left:-20%;animation-delay:0s}
.hero .speed-lines span:nth-child(2){top:28%;width:200px;left:-10%;animation-delay:0.8s}
.hero .speed-lines span:nth-child(3){top:44%;width:350px;left:-25%;animation-delay:1.6s}
.hero .speed-lines span:nth-child(4){top:62%;width:240px;left:-15%;animation-delay:2.2s}
.hero .speed-lines span:nth-child(5){top:78%;width:180px;left:-8%;animation-delay:2.8s}
@keyframes speedLine{from{transform:translateX(0);opacity:0}20%{opacity:0.15}80%{opacity:0.15}to{transform:translateX(120vw);opacity:0}}
.hero-grid{
  max-width:1240px;margin:0 auto;padding:0 32px;
  display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center;
  position:relative;z-index:1;
}
.hero-text .tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 18px;border-radius:99px;
  background:var(--amber-soft);color:var(--amber);
  font-size:12px;font-weight:700;letter-spacing:0.3px;margin-bottom:24px;
}
.tag .pulse{width:8px;height:8px;border-radius:50%;background:var(--amber);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.2}}
.hero-text h1{font-size:clamp(34px,5vw,54px);font-weight:900;line-height:1.08;letter-spacing:-1.5px;margin-bottom:20px}
.hero-text h1 .accent{
  background:linear-gradient(135deg,var(--cyan),#22d3ee);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;
}
.hero-text .desc{font-size:16px;color:var(--text3);line-height:1.8;margin-bottom:34px;max-width:460px}
.hero-btns{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.hero-btns .tip{font-size:12px;color:var(--text3)}

.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:10px;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--trans);border:none;white-space:nowrap;position:relative;overflow:hidden}
.btn-primary{background:linear-gradient(135deg,var(--cyan),#0284c7);color:#fff;box-shadow:0 6px 24px var(--cyan-glow)}
.btn-primary::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(135deg,transparent 40%,rgba(255,255,255,0.2) 50%,transparent 60%);
  transform:translateX(-100%);transition:transform 0.6s;
}
.btn-primary:hover::after{transform:translateX(100%)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 36px rgba(14,165,233,0.28)}
.btn-outline{background:var(--card-solid);color:var(--text);border:1.5px solid var(--border);backdrop-filter:blur(8px)}
.btn-outline:hover{border-color:var(--cyan);color:var(--cyan);background:var(--cyan-soft)}
.btn-light{background:var(--bg2);color:var(--text);border:1px solid var(--border);border-radius:10px}
.btn-light:hover{background:#fff;border-color:var(--cyan)}

/* Connection Visual - Glass node map */
.connect-visual{position:relative}
.connect-box{
  background:var(--card-solid);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-lg);backdrop-filter:blur(8px);
}
.connect-box .cb-top{
  padding:14px 18px;background:var(--bg2);border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:8px;
}
.cb-top .c-dot{width:9px;height:9px;border-radius:50%;background:#22c55e;animation:pulse 2s infinite}
.cb-top span{font-size:12px;color:var(--text2);font-weight:500}
.connect-box .cb-body{
  height:260px;background:linear-gradient(135deg,#f0f7fd 0%,#e3f1fa 30%,#edf6fc 70%);
  position:relative;display:grid;place-items:center;
}
.cb-body .node-map{position:relative;width:100%;height:100%;
  background:radial-gradient(circle at 50% 50%,rgba(14,165,233,0.06) 0%,transparent 60%),
             radial-gradient(circle at 30% 40%,rgba(14,165,233,0.04) 0%,transparent 40%),
             radial-gradient(circle at 70% 60%,rgba(14,165,233,0.04) 0%,transparent 40%);
}
.cb-body .node-dot{
  position:absolute;width:10px;height:10px;border-radius:50%;
  background:var(--cyan);box-shadow:0 0 12px var(--cyan-glow);
  animation:nodePulse 1.8s ease-in-out infinite;
}
.cb-body .node-dot:nth-child(1){top:20%;left:25%;animation-delay:0s}
.cb-body .node-dot:nth-child(2){top:35%;left:60%;animation-delay:0.4s}
.cb-body .node-dot:nth-child(3){top:55%;left:40%;animation-delay:0.8s}
.cb-body .node-dot:nth-child(4){top:70%;left:70%;animation-delay:1.2s}
.cb-body .node-dot:nth-child(5){top:45%;left:80%;animation-delay:1.6s}
.cb-body .node-line{
  position:absolute;top:50%;left:50%;width:120px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(14,165,233,0.2),transparent);
  transform-origin:left center;
}
@keyframes nodePulse{0%,100%{transform:scale(1);opacity:0.7}50%{transform:scale(1.8);opacity:1}}
.connect-info{
  position:absolute;bottom:-20px;left:-28px;
  background:var(--card);backdrop-filter:blur(16px);
  border:1px solid var(--border);border-radius:14px;
  padding:16px 22px;display:flex;align-items:center;gap:12px;
  box-shadow:var(--shadow-md);
}
.connect-info .ci-icon{
  width:42px;height:42px;border-radius:12px;
  background:linear-gradient(135deg,var(--cyan),var(--ocean));
  display:grid;place-items:center;font-size:18px;color:#fff;
}
.connect-info strong{display:block;font-size:13px;font-weight:700}
.connect-info span{font-size:11px;color:var(--cyan)}

/* Stats - Glass stripe */
.stats-strip{max-width:1240px;margin:0 auto;padding:0 32px 72px;position:relative;z-index:1}
.stats-inner{
  background:var(--card);backdrop-filter:blur(12px);
  border:1px solid var(--border);border-radius:var(--radius);
  padding:32px 44px;display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
  box-shadow:var(--shadow);
}
.stat-item{text-align:center;position:relative}
.stat-item:not(:last-child)::after{
  content:"";position:absolute;right:0;top:50%;transform:translateY(-50%);
  width:1px;height:36px;background:var(--border);
}
.stat-item .s-num{font-size:36px;font-weight:900;background:linear-gradient(135deg,var(--cyan),#22d3ee);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-1px}
.stat-item .s-label{font-size:12px;color:var(--text3);margin-top:4px;font-weight:500}

/* Sections */
.sec{max-width:1240px;margin:0 auto;padding:80px 32px}
.sec.sm{padding-top:0}
.sec-head{text-align:center;margin-bottom:56px}
.sec-head .label{
  display:inline-block;padding:6px 18px;border-radius:99px;
  background:var(--cyan-soft);color:var(--cyan);
  font-size:12px;font-weight:700;letter-spacing:0.8px;margin-bottom:16px;
}
.sec-head h2{font-size:clamp(28px,4vw,40px);font-weight:800;letter-spacing:-0.5px;margin-bottom:12px}
.sec-head p{color:var(--text3);font-size:15px;max-width:520px;margin:0 auto}

/* Feature - Glass cards */
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feat-card{
  background:var(--card);backdrop-filter:blur(12px);
  border:1px solid var(--border);border-radius:var(--radius);
  padding:32px 24px;transition:all var(--trans);
  position:relative;
}
.feat-card::before{
  content:"";position:absolute;top:-1px;left:20px;right:20px;height:2px;
  background:linear-gradient(90deg,transparent,var(--cyan),transparent);
  opacity:0;transition:opacity var(--trans);
}
.feat-card:hover::before{opacity:1}
.feat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-4px);border-color:#b8d8f0}
.feat-card .fc-icon{
  width:50px;height:50px;border-radius:14px;
  background:linear-gradient(135deg,var(--cyan-soft),rgba(14,165,233,0.05));
  display:grid;place-items:center;font-size:22px;margin-bottom:18px;
}
.feat-card h3{font-size:16px;font-weight:700;margin-bottom:8px}
.feat-card p{font-size:13px;color:var(--text3);line-height:1.7}

/* Device - Ocean dark area */
.dark-area{
  background:linear-gradient(160deg,#0a1929 0%,#0f2847 40%,#0d2137 100%);
  color:#fff;position:relative;overflow:hidden;
}
.dark-area::before{
  content:"";position:absolute;bottom:-100px;right:-100px;
  width:500px;height:400px;
  background:radial-gradient(ellipse,rgba(14,165,233,0.1) 0%,transparent 60%);
  pointer-events:none;
}
.dark-area::after{
  content:"";position:absolute;top:-60px;left:-60px;
  width:300px;height:300px;
  background:radial-gradient(circle,rgba(34,211,238,0.06) 0%,transparent 60%);
  pointer-events:none;
}
.dark-area .sec-head .label{background:rgba(14,165,233,0.12);color:#38bdf8}
.dark-area .sec-head h2{color:#fff}
.dark-area .sec-head p{color:#6b96b8}
.device-row{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;position:relative;z-index:1}
.device-card{
  background:rgba(255,255,255,0.03);border:1px solid rgba(255,255,255,0.06);
  border-radius:var(--radius);padding:36px 24px;text-align:center;
  transition:all var(--trans);backdrop-filter:blur(4px);
}
.device-card:hover{
  background:rgba(255,255,255,0.07);transform:translateY(-4px);
  border-color:rgba(14,165,233,0.25);box-shadow:0 12px 40px rgba(14,165,233,0.06);
}
.device-card .dv-icon{font-size:38px;margin-bottom:14px;display:block}
.device-card h4{font-size:16px;font-weight:700}
.device-card p{font-size:12px;color:#6b96b8;margin-top:6px}

/* Advantage */
.adv-row{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.adv-card{
  background:var(--card);backdrop-filter:blur(12px);
  border:1px solid var(--border);border-radius:var(--radius);
  padding:36px 28px;transition:all var(--trans);
}
.adv-card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px);border-color:#b8d8f0}
.adv-card .av-icon{
  width:48px;height:48px;border-radius:14px;
  background:linear-gradient(135deg,var(--cyan-soft),rgba(14,165,233,0.03));
  display:grid;place-items:center;font-size:22px;margin-bottom:18px;
}
.adv-card h3{font-size:18px;font-weight:700;margin-bottom:8px}
.adv-card p{font-size:13px;color:var(--text3);line-height:1.7}
.adv-card .av-list{margin-top:16px;display:flex;flex-direction:column;gap:8px}
.adv-card .av-list span{font-size:12px;color:var(--text2);padding-left:18px;position:relative}
.adv-card .av-list span::before{
  content:"";position:absolute;left:0;top:6px;
  width:6px;height:6px;border-radius:50%;background:var(--cyan);
}

/* FAQ */
.faq-wrap{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
.faq-item{
  background:var(--card);backdrop-filter:blur(12px);
  border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;
  transition:all var(--trans);
}
.faq-item:hover{border-color:#b8d8f0}
.faq-q{
  width:100%;padding:20px 24px;background:none;border:none;
  color:var(--text);font-size:15px;font-weight:600;text-align:left;
  cursor:pointer;display:flex;justify-content:space-between;align-items:center;
  font-family:inherit;
}
.faq-q .arrow{font-size:12px;color:var(--cyan);transition:transform var(--trans)}
.faq-a{padding:0 24px 20px;font-size:14px;color:var(--text3);line-height:1.8;display:none}
.faq-item.open .faq-a{display:block}
.faq-item.open .arrow{transform:rotate(180deg)}
.faq-item.open{border-color:var(--cyan);box-shadow:0 0 0 4px var(--cyan-glow)}

/* CTA */
.cta-zone{position:relative}
.cta-box{
  background:linear-gradient(135deg,rgba(14,165,233,0.04),rgba(34,211,238,0.06));
  border:1.5px solid rgba(14,165,233,0.12);border-radius:var(--radius);
  padding:64px 48px;text-align:center;backdrop-filter:blur(8px);
}
.cta-box h2{font-size:clamp(28px,4vw,36px);font-weight:800;margin-bottom:12px}
.cta-box p{color:var(--text3);font-size:15px;margin-bottom:28px}
.cta-box .cta-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* Footer */
.footer{background:var(--bg2);border-top:1px solid var(--border)}
.footer-grid{
  max-width:1240px;margin:0 auto;padding:56px 32px 28px;
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;
}
.footer-brand .fl{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;margin-bottom:12px}
.footer-brand .fl img{width:28px;height:28px;border-radius:8px}
.footer-brand .fl .fc{color:var(--cyan)}
.footer-brand p{font-size:13px;color:var(--text3);line-height:1.7;max-width:260px}
.footer-col h4{font-size:14px;font-weight:700;margin-bottom:16px}
.footer-col a{display:block;font-size:13px;color:var(--text3);padding:5px 0;transition:color var(--trans)}
.footer-col a:hover{color:var(--cyan)}
.footer-bottom{
  max-width:1240px;margin:0 auto;padding:18px 32px;
  border-top:1px solid var(--border);
  display:flex;justify-content:space-between;font-size:12px;color:var(--text3);
  flex-wrap:wrap;gap:12px;
}

/* Download hero */
.dl-hero{padding:130px 0 56px;text-align:center;background:linear-gradient(180deg,#f5f9fc,var(--bg2))}
.dl-hero-inner{max-width:760px;margin:0 auto;padding:0 32px}
.dl-hero-inner h1{font-size:clamp(30px,5vw,44px);font-weight:900;margin-bottom:12px}
.dl-hero-inner .dl-sub{color:var(--text3);font-size:14px;margin-bottom:20px}
.dl-meta{display:inline-flex;gap:22px;font-size:13px;color:var(--text2);flex-wrap:wrap;justify-content:center}

/* Download cards */
.dl-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;max-width:1240px;margin:0 auto;padding:0 32px 56px}
.dl-card{
  background:var(--card);backdrop-filter:blur(12px);
  border:1.5px solid var(--border);border-radius:var(--radius);
  padding:32px 24px;text-align:center;transition:all var(--trans);
  display:flex;flex-direction:column;gap:14px;
}
.dl-card:hover{border-color:var(--cyan);box-shadow:var(--shadow-md);transform:translateY(-3px)}
.dl-card .dl-tag{
  display:inline-block;padding:5px 16px;border-radius:99px;
  font-size:11px;font-weight:700;
  background:var(--cyan-soft);color:var(--cyan);
  align-self:center;
}
.dl-card h3{font-size:17px;font-weight:700}
.dl-card .dl-info{font-size:12px;color:var(--text3);line-height:1.6}
.dl-card .dl-size{font-size:11px;color:var(--text3)}

/* Notice */
.dl-notice{max-width:1240px;margin:0 auto 56px;padding:0 32px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.dl-notice .nt{
  background:var(--card);backdrop-filter:blur(12px);
  border:1px solid var(--border);border-radius:var(--radius-sm);
  padding:24px 20px;display:flex;gap:14px;align-items:flex-start;
}
.nt .nt-num{
  width:34px;height:34px;border-radius:50%;
  background:linear-gradient(135deg,var(--cyan),var(--ocean));
  color:#fff;display:grid;place-items:center;font-size:14px;font-weight:800;flex-shrink:0;
}
.nt strong{display:block;font-size:14px;margin-bottom:4px}
.nt p{font-size:12px;color:var(--text3);line-height:1.6}

/* Specs table */
.specs-tbl{max-width:760px;margin:0 auto;background:var(--card);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.specs-tbl .sr{display:grid;grid-template-columns:150px 1fr;border-bottom:1px solid var(--border)}
.specs-tbl .sr:last-child{border-bottom:none}
.specs-tbl .sl{padding:15px 20px;background:var(--cyan-soft);font-size:12px;font-weight:700;color:var(--cyan)}
.specs-tbl .sv{padding:15px 20px;font-size:12px;color:var(--text2)}

/* 404 */
.err-wrap{min-height:100vh;display:grid;place-items:center;padding:32px;background:linear-gradient(160deg,#f5f9fc 0%,#e4f1f9 100%)}
.err-card{
  max-width:480px;text-align:center;
  background:var(--card);backdrop-filter:blur(16px);
  border:1.5px solid var(--border);border-radius:var(--radius);
  padding:60px 48px;box-shadow:var(--shadow-lg);
}
.err-card .err-num{
  font-size:clamp(90px,16vw,140px);font-weight:900;
  background:linear-gradient(135deg,var(--cyan),#22d3ee);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;line-height:0.9;margin-bottom:8px;
}
.err-card h1{font-size:20px;font-weight:700;margin-bottom:12px}
.err-card p{color:var(--text3);font-size:13px;line-height:1.7;margin-bottom:28px}
.err-card .err-btns{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}

@media(max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .device-row,.dl-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:768px){
  .nav-menu{display:none}
  .nav-toggle{display:block}
  .nav-menu.open{display:flex;flex-direction:column;position:absolute;top:66px;left:0;right:0;background:rgba(255,255,255,0.98);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);padding:12px 24px;gap:4px;z-index:99}
  .hero{padding:120px 0 50px}
  .stats-inner{grid-template-columns:repeat(2,1fr)}
  .stats-inner .stat-item:not(:last-child)::after{display:none}
  .feat-grid{grid-template-columns:1fr}
  .adv-row{grid-template-columns:1fr}
  .device-row{grid-template-columns:1fr}
  .dl-grid{grid-template-columns:1fr}
  .dl-notice{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .sec{padding:52px 20px}
}