/* ===== QuickQ · 锋速极客·靛蓝白风 ===== */
:root {
  --bg: #f7f8fb;
  --bg2: #eef0f6;
  --bg3: #e2e5f0;
  --card: #ffffff;
  --border: #e0e3ed;
  --border-light: #eceef5;
  --text: #0f1222;
  --text2: #3a3f5c;
  --text3: #7b7f9a;
  --indigo: #4338ca;
  --indigo-light: #6366f1;
  --indigo-soft: #eef0ff;
  --indigo-glow: rgba(67,56,202,0.12);
  --violet: #7c3aed;
  --violet-soft: #f5f0ff;
  --amber: #f59e0b;
  --amber-soft: #fffbeb;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow: 0 2px 12px rgba(67,56,202,0.04);
  --shadow-md: 0 8px 28px rgba(67,56,202,0.07);
  --shadow-lg: 0 20px 56px rgba(67,56,202,0.1);
  --trans: 0.3s cubic-bezier(0.4,0,0.2,1);
}
*,*::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:rgba(247,248,251,0.85);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  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:8px;font-size:18px;font-weight:800;letter-spacing:-0.3px}
.nav-brand .brand-mark{
  width:34px;height:34px;border-radius:var(--radius-xs);
  background:linear-gradient(135deg,var(--indigo),var(--violet));
  display:grid;place-items:center;font-size:16px;color:#fff;font-weight:900;
}
.nav-brand .accent{color:var(--indigo)}
.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(--indigo);background:var(--indigo-soft)}
.nav-menu a.btn-nav{background:linear-gradient(135deg,var(--indigo),#3730a3);color:#fff;font-weight:600;border-radius:8px;padding:10px 22px;box-shadow:0 4px 16px var(--indigo-glow)}
.nav-menu a.btn-nav:hover{transform:translateY(-2px);box-shadow:0 8px 26px rgba(67,56,202,0.25)}
.nav-toggle{display:none;background:none;border:none;color:var(--text);font-size:24px;cursor:pointer}

/* Hero */
.hero{
  padding:152px 0 64px;position:relative;overflow:hidden;
  background:linear-gradient(175deg,#f7f8fb 0%,#f0f2f8 30%,#eef0f6 60%,#f7f8fb 100%);
}
.hero::before{
  content:"";position:absolute;top:-160px;right:-100px;
  width:560px;height:560px;
  background:radial-gradient(circle,rgba(67,56,202,0.06) 0%,transparent 60%);
  pointer-events:none;border-radius:50%;
}
.hero::after{
  content:"";position:absolute;bottom:-80px;left:5%;
  width:400px;height:280px;
  background:radial-gradient(ellipse,rgba(124,58,237,0.04) 0%,transparent 60%);
  pointer-events:none;border-radius:50%;
}
.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;margin-bottom:24px;
}
.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 .hl{
  background:linear-gradient(135deg,var(--indigo),var(--violet));
  -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 .ver{font-size:12px;color:var(--text3)}

.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:all var(--trans);border:none;white-space:nowrap}
.btn-fill{background:linear-gradient(135deg,var(--indigo),#3730a3);color:#fff;box-shadow:0 6px 24px var(--indigo-glow)}
.btn-fill:hover{transform:translateY(-2px);box-shadow:0 12px 36px rgba(67,56,202,0.25)}
.btn-line{background:var(--card);color:var(--text);border:1.5px solid var(--border)}
.btn-line:hover{border-color:var(--indigo);color:var(--indigo);background:var(--indigo-soft)}
.btn-muted{background:var(--bg2);color:var(--text);border:1px solid var(--border);border-radius:8px}
.btn-muted:hover{background:#fff;border-color:var(--indigo)}

/* Network Visual - speed chart */
.net-visual{position:relative;display:grid;place-items:center}
.net-node{
  position:relative;width:320px;height:320px;
  background:var(--card);border:1.5px solid var(--border);
  border-radius:50%;display:grid;place-items:center;
  box-shadow:var(--shadow-lg);
}
.net-node::before{
  content:"";width:180px;height:180px;
  border-radius:50%;border:1px dashed var(--border);
  position:absolute;
}
.net-node::after{
  content:"";width:80px;height:80px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--indigo),var(--violet));
  box-shadow:0 0 32px var(--indigo-glow);
}
.nd{position:absolute;z-index:2}
.nd .nd-dot{
  width:10px;height:10px;border-radius:50%;
  background:var(--indigo);display:block;box-shadow:0 0 10px var(--indigo-glow);
  transition:all var(--trans);
}
.nd .nd-label{
  position:absolute;top:-20px;left:50%;transform:translateX(-50%);
  font-size:10px;color:var(--text3);white-space:nowrap;font-weight:600;opacity:0;
  transition:opacity var(--trans);
}
.nd:hover .nd-dot{background:var(--violet);transform:scale(1.4);box-shadow:0 0 16px rgba(124,58,237,0.3)}
.nd:hover .nd-label{opacity:1}
.nd1{top:12%;left:20%}.nd2{top:18%;right:22%}.nd3{bottom:16%;left:18%}.nd4{bottom:20%;right:20%}.nd5{top:44%;right:6%}.nd6{bottom:40%;left:6%}
.net-card{
  position:absolute;bottom:0;right:-20px;
  background:var(--card);border:1px solid var(--border);
  border-radius:12px;padding:14px 18px;box-shadow:var(--shadow-md);
}
.net-card .nc-row{display:flex;align-items:center;gap:10px}
.nc-row .nc-dot{width:9px;height:9px;background:#22c55e;border-radius:50%;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.3}}
.nc-row strong{display:block;font-size:13px;font-weight:700}
.nc-row span{font-size:11px;color:var(--indigo)}

/* Connection bar */
.conn-bar{max-width:1240px;margin:0 auto;padding:0 32px 72px;position:relative;z-index:1}
.conn-inner{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:22px 36px;
  display:flex;align-items:center;justify-content:center;gap:36px;flex-wrap:wrap;
  box-shadow:var(--shadow);
}
.conn-inner .ci{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text2);font-weight:500}
.ci .cii{font-size:16px}

/* Sections */
.sec{max-width:1240px;margin:0 auto;padding:80px 32px}
.sec-head{text-align:center;margin-bottom:56px}
.sec-head .label{
  display:inline-block;padding:5px 16px;border-radius:99px;
  background:var(--indigo-soft);color:var(--indigo);
  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}

/* Features */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feat-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:30px 26px;
  transition:all var(--trans);position:relative;overflow:hidden;
}
.feat-card::after{
  content:"";position:absolute;bottom:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--indigo),var(--violet));
  opacity:0;transition:opacity var(--trans);
}
.feat-card:hover::after{opacity:1}
.feat-card:hover{box-shadow:var(--shadow-md);transform:translateY(-3px);border-color:#ccc8f0}
.feat-card .fc-icon{
  width:44px;height:44px;border-radius:12px;
  background:linear-gradient(135deg,var(--indigo-soft),rgba(67,56,202,0.03));
  display:grid;place-items:center;font-size:20px;margin-bottom:16px;
}
.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}

/* Protocol dark zone */
.dark-zone{
  background:linear-gradient(160deg,#0c0e1a 0%,#131836 40%,#0f1228 100%);
  color:#fff;position:relative;overflow:hidden;
}
.dark-zone::before{
  content:"";position:absolute;top:-100px;right:-80px;
  width:400px;height:400px;
  background:radial-gradient(circle,rgba(99,102,241,0.1) 0%,transparent 60%);
  pointer-events:none;
}
.dark-zone .sec-head .label{background:rgba(99,102,241,0.12);color:#818cf8}
.dark-zone .sec-head h2{color:#fff}
.dark-zone .sec-head p{color:#7179a8}
.proto-row{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;position:relative;z-index:1}
.proto-card{
  background:rgba(255,255,255,0.03);border:1px solid rgba(255,255,255,0.06);
  border-radius:var(--radius);padding:28px 20px;text-align:center;
  transition:all var(--trans);
}
.proto-card:hover{background:rgba(255,255,255,0.06);transform:translateY(-3px);border-color:rgba(99,102,241,0.2)}
.proto-card .pc-icon{font-size:32px;margin-bottom:10px;display:block}
.proto-card h3{font-size:15px;font-weight:700;margin-bottom:6px}
.proto-card p{font-size:11px;color:#7179a8;line-height:1.6}

/* Speed cards */
.speed-row{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.speed-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:30px 18px;text-align:center;
  transition:all var(--trans);
}
.speed-card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}
.speed-card .sn{
  font-size:38px;font-weight:900;
  background:linear-gradient(135deg,var(--indigo),var(--violet));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;
  background-clip:text;letter-spacing:-1px;
}
.speed-card .sl{font-size:13px;color:var(--text2);margin-top:4px;font-weight:600}
.speed-card .ss{font-size:11px;color:var(--text3);margin-top:4px}

/* Steps */
.step-list{max-width:880px;margin:0 auto;display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.step-item{text-align:center;position:relative}
.step-item:not(:last-child)::after{
  content:"";position:absolute;top:24px;right:-14px;width:28px;height:2px;
  background:var(--border);
}
.step-item .step-num{
  width:48px;height:48px;margin:0 auto 16px;border-radius:50%;
  background:linear-gradient(135deg,var(--indigo),var(--violet));
  display:grid;place-items:center;font-size:17px;font-weight:800;color:#fff;
  box-shadow:0 4px 16px var(--indigo-glow);
}
.step-item h3{font-size:16px;font-weight:700;margin-bottom:8px}
.step-item p{font-size:13px;color:var(--text3);line-height:1.6}

/* FAQ */
.faq-wrap{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden;transition:all var(--trans)}
.faq-item:hover{border-color:#ccc8f0}
.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(--indigo);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(--indigo);box-shadow:0 0 0 4px var(--indigo-glow)}

/* CTA */
.cta-box{
  background:linear-gradient(135deg,rgba(67,56,202,0.04),rgba(124,58,237,0.05));
  border:1.5px solid rgba(67,56,202,0.12);border-radius:var(--radius);
  padding:60px 48px;text-align:center;
}
.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;opacity:1}
.footer-brand .fl .brand-mark{width:28px;height:28px;border-radius:6px;background:linear-gradient(135deg,var(--indigo),var(--violet));display:grid;place-items:center;font-size:13px;color:#fff;font-weight:900}
.footer-brand .fl .fc{color:var(--indigo)}
.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(--indigo)}
.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 */
.dl-hero{padding:130px 0 56px;text-align:center;background:linear-gradient(180deg,#f7f8fb,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}
.dl-grid{max-width:1240px;margin:0 auto 56px;padding:0 32px;display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.dl-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:32px 26px;text-align:center;
  transition:all var(--trans);display:flex;flex-direction:column;gap:14px;
}
.dl-card:hover{border-color:var(--indigo);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(--indigo-soft);color:var(--indigo);align-self:center}
.dl-card h3{font-size:18px;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)}
.dl-tips{max-width:1240px;margin:0 auto 56px;padding:0 32px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.dl-tips .tp{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);padding:22px 18px;display:flex;gap:14px;align-items:flex-start}
.tp .tp-num{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--indigo),var(--violet));color:#fff;display:grid;place-items:center;font-size:13px;font-weight:800;flex-shrink:0}
.tp strong{display:block;font-size:14px;margin-bottom:4px}
.tp p{font-size:12px;color:var(--text3);line-height:1.6}

.specs-tbl{max-width:760px;margin:0 auto;background:var(--card);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(--indigo-soft);font-size:12px;font-weight:700;color:var(--indigo)}
.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,#f7f8fb 0%,#eef0f6 100%)}
.err-card{
  max-width:480px;text-align:center;
  background:var(--card);border:1px 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(--indigo),var(--violet));
  -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}
  .net-visual{margin-top:20px}
  .feat-grid{grid-template-columns:repeat(2,1fr)}
  .proto-row{grid-template-columns:repeat(2,1fr)}
  .dl-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .step-item:not(:last-child)::after{display:none}
}
@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}
  .feat-grid{grid-template-columns:1fr}
  .proto-row{grid-template-columns:1fr}
  .speed-row{grid-template-columns:repeat(2,1fr)}
  .step-list{grid-template-columns:1fr;gap:20px}
  .dl-grid,.dl-tips{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .sec{padding:52px 20px}
  .cta-box{padding:44px 24px}
}