/* ===== QuickQ - 网络加速·赛博朋克科技风 ===== */
:root {
  --bg: #060b14;
  --bg2: #0a1022;
  --bg3: #0f172e;
  --card: #0b1226;
  --card-hover: #101a34;
  --border: #182442;
  --border-light: #1f3058;
  --text: #e8effa;
  --text2: #9aafce;
  --text3: #546888;
  --cyan: #00e5a0;
  --cyan-light: #3dffbf;
  --teal: #0ea5e9;
  --teal-light: #38bdf8;
  --grad: linear-gradient(135deg, #00e5a0, #0ea5e9);
  --grad-soft: linear-gradient(135deg, rgba(0,229,160,0.06), rgba(14,165,233,0.06));
  --radius: 14px;
  --radius-sm: 8px;
  --shadow: 0 6px 28px rgba(0,0,0,0.4);
  --shadow-lg: 0 20px 56px rgba(0,0,0,0.6);
  --trans: 0.28s 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:1.65;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
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(6,11,20,0.9);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid rgba(24,36,66,0.5);
}
.nav-inner{
  max-width:1240px;margin:0 auto;padding:0 32px;height:64px;
  display:flex;align-items:center;justify-content:space-between;
}
.nav-brand{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:800;letter-spacing:-0.2px}
.nav-brand .dot{width:8px;height:8px;background:var(--cyan);border-radius:50%;box-shadow:0 0 10px var(--cyan);animation:pulse-glow 2s infinite}
@keyframes pulse-glow{0%,100%{opacity:1;box-shadow:0 0 8px var(--cyan)}50%{opacity:0.35;box-shadow:0 0 18px var(--cyan)}}
.nav-brand .accent{color:var(--cyan)}
.nav-menu{display:flex;align-items:center;gap:4px}
.nav-menu a{padding:8px 16px;border-radius:6px;font-size:13px;font-weight:500;color:var(--text2);transition:all var(--trans)}
.nav-menu a:hover{color:#fff;background:rgba(0,229,160,0.05)}
.nav-menu a.btn-nav{background:var(--grad);color:#000;font-weight:700;border-radius:6px;padding:9px 20px}
.nav-menu a.btn-nav:hover{transform:translateY(-1px);box-shadow:0 4px 20px rgba(0,229,160,0.3)}
.nav-toggle{display:none;background:none;border:none;color:var(--text);font-size:24px;cursor:pointer}

/* Hero */
.hero{
  padding:148px 0 80px;position:relative;overflow:hidden;
  background:
    radial-gradient(ellipse 70% 50% at 40% 10%,rgba(0,229,160,0.05) 0%,transparent 55%),
    radial-gradient(ellipse 50% 40% at 80% 60%,rgba(14,165,233,0.04) 0%,transparent 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:4px 14px;border-radius:4px;
  background:rgba(0,229,160,0.06);border:1px solid rgba(0,229,160,0.12);
  color:var(--cyan-light);font-size:11px;font-weight:700;letter-spacing:0.5px;margin-bottom:24px
}
.hero-text h1{font-size:clamp(34px,5vw,52px);font-weight:900;line-height:1.04;letter-spacing:-1px;margin-bottom:18px}
.hero-text h1 .hl{background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-text .desc{font-size:15px;color:var(--text3);line-height:1.8;margin-bottom:32px;max-width:440px}
.hero-btns{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.hero-btns .ver{font-size:11px;color:var(--text3);margin-left:8px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:6px;font-size:13px;font-weight:600;cursor:pointer;transition:all var(--trans);border:none;white-space:nowrap}
.btn-fill{background:var(--grad);color:#000;font-weight:700;box-shadow:0 6px 22px rgba(0,229,160,0.25)}
.btn-fill:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(0,229,160,0.4)}
.btn-line{background:transparent;color:var(--text);border:1px solid var(--border-light)}
.btn-line:hover{border-color:var(--cyan);color:var(--cyan-light)}
.btn-muted{background:rgba(255,255,255,0.03);color:var(--text);border:1px solid var(--border)}
.btn-muted:hover{background:rgba(255,255,255,0.06)}

/* Network visual */
.net-visual{position:relative;height:380px;display:grid;place-items:center}
.net-node{
  position:relative;width:300px;height:300px;
  background:radial-gradient(circle at 50% 50%,rgba(0,229,160,0.06) 0%,transparent 70%);
  border-radius:50%;border:1px solid rgba(0,229,160,0.10)
}
.net-node::before{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:14px;height:14px;background:var(--cyan);border-radius:50%;box-shadow:0 0 24px var(--cyan);z-index:2}
.nd{position:absolute;z-index:1}
.nd1{top:12%;left:18%}.nd2{top:16%;right:20%}.nd3{bottom:18%;left:16%}.nd4{bottom:16%;right:22%}.nd5{top:42%;right:8%}.nd6{bottom:38%;left:6%}
.nd .nd-dot{width:8px;height:8px;background:var(--teal);border-radius:50%;display:block;box-shadow:0 0 8px var(--teal);transition:all 0.5s}
.nd:hover .nd-dot{background:var(--cyan);box-shadow:0 0 16px var(--cyan);transform:scale(1.5)}
.nd .nd-label{position:absolute;top:-22px;left:50%;transform:translateX(-50%);font-size:9px;color:var(--teal-light);white-space:nowrap;font-weight:600;opacity:0;transition:opacity 0.3s}
.nd:hover .nd-label{opacity:1}
.net-card{
  position:absolute;bottom:8px;right:0;
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:14px 18px;box-shadow:var(--shadow)
}
.net-card .nc-row{display:flex;align-items:center;gap:8px}
.nc-row .nc-dot{width:7px;height:7px;background:var(--cyan);border-radius:50%;animation:pulse-glow 2s infinite}
.nc-row strong{font-size:12px;color:var(--text2)}
.nc-row span{font-size:10px;color:var(--cyan-light)}

/* Connection bar */
.conn-bar{max-width:1240px;margin:0 auto;padding:0 32px 72px;position:relative;z-index:1}
.conn-inner{
  background:var(--grad-soft);border:1px solid var(--border);
  border-radius:var(--radius);padding:20px 36px;
  display:flex;align-items:center;justify-content:center;gap:36px;flex-wrap:wrap
}
.conn-inner .ci{display:flex;align-items:center;gap:8px;font-size:12px;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:4px 14px;border-radius:4px;
  background:rgba(0,229,160,0.05);border:1px solid rgba(0,229,160,0.1);
  color:var(--cyan-light);font-size:11px;font-weight:700;letter-spacing:1px;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
}
.feat-card:hover{border-color:var(--cyan);transform:translateY(-2px);box-shadow:0 0 0 1px rgba(0,229,160,0.1),var(--shadow)}
.feat-card .fc-icon{
  width:40px;height:40px;border-radius:8px;
  background:var(--grad-soft);display:grid;place-items:center;
  font-size:18px;margin-bottom:16px
}
.feat-card h3{font-size:15px;font-weight:700;margin-bottom:8px}
.feat-card p{font-size:12px;color:var(--text3);line-height:1.7}

/* Protocol dark zone */
.dark-zone{
  background:linear-gradient(180deg,rgba(10,16,34,0.5),var(--bg2),rgba(10,16,34,0.5));
  border-top:1px solid var(--border);border-bottom:1px solid var(--border)
}
.proto-row{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.proto-card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius);padding:26px 20px;text-align:center;
  transition:all var(--trans)
}
.proto-card:hover{border-color:var(--border-light);transform:translateY(-2px);box-shadow:var(--shadow)}
.proto-card .pc-icon{font-size:30px;margin-bottom:10px;display:block}
.proto-card h3{font-size:14px;font-weight:700;margin-bottom:4px}
.proto-card p{font-size:11px;color:var(--text3);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:28px 18px;text-align:center
}
.speed-card .sn{font-size:38px;font-weight:900;background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.speed-card .sl{font-size:12px;color:var(--text2);margin-top:4px}
.speed-card .ss{font-size:10px;color:var(--text3);margin-top:2px}

/* 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:1px;
  background:var(--border-light)
}
.step-item .step-num{
  width:48px;height:48px;margin:0 auto 16px;border-radius:50%;
  background:var(--grad);display:grid;place-items:center;
  font-size:17px;font-weight:800;color:#000
}
.step-item h3{font-size:15px;font-weight:700;margin-bottom:6px}
.step-item p{font-size:12px;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}
.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:11px;color:var(--cyan-light);transition:transform var(--trans)}
.faq-a{padding:0 24px 20px;font-size:13px;color:var(--text3);line-height:1.8;display:none}
.faq-item.open .faq-a{display:block}
.faq-item.open .arrow{transform:rotate(180deg)}

/* CTA */
.cta-box{
  background:var(--grad-soft);border:1px solid rgba(0,229,160,0.12);
  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:16px;font-weight:800;margin-bottom:12px}
.footer-brand .fl .dot{width:6px;height:6px;background:var(--cyan);border-radius:50%}
.footer-brand .fl .fc{color:var(--cyan)}
.footer-brand p{font-size:12px;color:var(--text3);line-height:1.7;max-width:250px}
.footer-col h4{font-size:13px;font-weight:700;margin-bottom:16px}
.footer-col a{display:block;font-size:12px;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:11px;color:var(--text3);
  flex-wrap:wrap;gap:12px
}

/* Download */
.dl-hero{padding:130px 0 56px;text-align:center;background:radial-gradient(ellipse 60% 50% at 50% 30%,rgba(0,229,160,0.04) 0%,transparent 55%)}
.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:18px}
.dl-meta{display:inline-flex;gap:18px;font-size:12px;color:var(--text2);flex-wrap:wrap}
.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(--cyan);transform:translateY(-2px);box-shadow:0 0 0 1px rgba(0,229,160,0.1),var(--shadow)}
.dl-card .dl-tag{display:inline-block;padding:3px 12px;border-radius:4px;font-size:11px;font-weight:700;background:rgba(0,229,160,0.06);color:var(--cyan-light);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:28px;height:28px;border-radius:6px;background:var(--grad-soft);color:var(--cyan-light);display:grid;place-items:center;font-size:13px;font-weight:800;flex-shrink:0}
.tp strong{display:block;font-size:13px;margin-bottom:4px}
.tp p{font-size:11px;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:14px 18px;background:var(--bg3);font-size:12px;font-weight:700;color:var(--cyan-light)}
.specs-tbl .sv{padding:14px 18px;font-size:12px;color:var(--text2)}

/* 404 */
.err-wrap{min-height:100vh;display:grid;place-items:center;padding:32px;background:var(--bg)}
.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:var(--grad);-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{height:280px}
  .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:64px;left:0;right:0;background:var(--bg2);border-bottom:1px solid var(--border);padding:12px 24px;gap:4px;z-index:99}
  .hero{padding:120px 0 50px}
  .net-visual{display:none}
  .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}
}