/* ==========================================================================
   QuickQ · 站点设计系统
   标题：QuickQ - 安全、快速、无界的网络体验
   ========================================================================== */

:root{
  --bg:#070b16;
  --bg2:#0b1222;
  --card:rgba(255,255,255,.038);
  --card2:rgba(255,255,255,.06);
  --line:rgba(255,255,255,.09);
  --line2:rgba(255,255,255,.16);
  --txt:#e9edf7;
  --muted:#96a1bb;
  --brand:#22d3ee;
  --brand2:#7c5cff;
  --grad:linear-gradient(120deg,#22d3ee 0%,#4f8cff 55%,#7c5cff 100%);
  --glow:0 24px 60px -20px rgba(34,211,238,.55);
  --radius:18px;
  --wrap:1180px;
  --ease:cubic-bezier(.22,.8,.3,1);
}

*{margin:0;padding:0;box-sizing:border-box}

html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}

body{
  font-family:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background:var(--bg);
  color:var(--txt);
  line-height:1.7;
  font-size:16px;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(900px 600px at 12% -8%,rgba(34,211,238,.16),transparent 60%),
    radial-gradient(800px 620px at 92% 4%,rgba(124,92,255,.18),transparent 62%),
    radial-gradient(760px 520px at 50% 108%,rgba(79,140,255,.12),transparent 65%);
}

img,svg{display:block;max-width:100%}

a{color:inherit;text-decoration:none;transition:.25s var(--ease)}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* ============ 通用按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  height:48px;padding:0 26px;border-radius:999px;font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;white-space:nowrap;
  transition:.28s var(--ease);
}
.btn svg{width:18px;height:18px;flex:none}
.btn.pri{background:var(--grad);color:#04121c;box-shadow:var(--glow)}
.btn.pri:hover{transform:translateY(-2px);box-shadow:0 30px 66px -18px rgba(34,211,238,.75)}
.btn.ghost{border-color:var(--line2);color:var(--txt);background:rgba(255,255,255,.02)}
.btn.ghost:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px)}
.btn.sm{height:40px;padding:0 18px;font-size:14px}

/* ============ 顶栏 ============ */
.topbar{
  font-size:13px;color:var(--muted);
  border-bottom:1px solid var(--line);
  background:rgba(7,11,22,.6);backdrop-filter:blur(12px);
}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:40px}
.topbar b{color:var(--txt);letter-spacing:.14em;font-size:12px}
.topbar .tb-l{display:flex;align-items:center;gap:12px;min-width:0}
.topbar .tb-l span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.topbar .tb-r{display:flex;align-items:center;gap:8px;flex:none}
.topbar a:hover{color:var(--brand)}

/* ============ 导航 ============ */
header.site{
  position:sticky;top:0;z-index:60;
  background:rgba(7,11,22,.78);backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
}
header.site.on{box-shadow:0 12px 40px -22px rgba(0,0,0,.9)}
.nav{display:flex;align-items:center;gap:22px;height:74px}
.brand{display:flex;align-items:center;gap:11px;flex:none}
.mark{
  width:38px;height:38px;border-radius:11px;display:grid;place-items:center;
  background:var(--grad);color:#04121c;font-weight:800;font-size:19px;
  box-shadow:0 10px 24px -10px rgba(34,211,238,.8);
}
.bn{display:flex;flex-direction:column;line-height:1.15}
.bn b{font-size:16.5px;letter-spacing:.02em;font-weight:700}
.bn span{font-size:11px;color:var(--muted);letter-spacing:.18em;text-transform:uppercase}
.menu{display:flex;align-items:center;gap:4px;margin-left:auto}
.menu a{
  padding:9px 15px;border-radius:10px;font-size:14.5px;color:var(--muted);font-weight:500;
}
.menu a:hover{color:var(--txt);background:rgba(255,255,255,.05)}
.menu a.on{color:var(--brand);background:rgba(34,211,238,.1)}
.nav>.btn{margin-left:8px}
.burger{
  display:none;width:42px;height:42px;border-radius:11px;align-items:center;justify-content:center;
  background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--txt);cursor:pointer;
}

/* ============ Hero ============ */
.hero{position:relative;padding:96px 0 88px;overflow:hidden}
.hero .grid{display:grid;grid-template-columns:1.08fr .92fr;gap:60px;align-items:center}
.kick{
  display:inline-flex;align-items:center;gap:9px;margin-bottom:22px;
  padding:7px 16px;border-radius:999px;font-size:13px;color:var(--brand);
  background:rgba(34,211,238,.09);border:1px solid rgba(34,211,238,.26);
}
.kick .dot{width:7px;height:7px;border-radius:50%;background:var(--brand);box-shadow:0 0 12px var(--brand);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.72)}}
.hero h1{font-size:clamp(34px,4.4vw,56px);line-height:1.16;letter-spacing:-.015em;font-weight:800}
.hero h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{margin-top:22px;font-size:17px;color:var(--muted);max-width:560px}
.hero .ctas{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
.hero .stats{display:flex;flex-wrap:wrap;gap:38px;margin-top:46px;padding-top:30px;border-top:1px solid var(--line)}
.hero .stats .num{font-size:27px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .stats .cap{font-size:13px;color:var(--muted);margin-top:2px}

/* 右侧可视化 */
.orb{position:relative;aspect-ratio:1/1;max-width:460px;margin-left:auto;display:grid;place-items:center}
.orb .ring{position:absolute;border-radius:50%;border:1px solid var(--line2)}
.orb .ring.r1{inset:0;border-style:dashed;animation:spin 34s linear infinite}
.orb .ring.r2{inset:11%;border-color:rgba(34,211,238,.28);animation:spin 22s linear infinite reverse}
.orb .ring.r3{inset:23%;border-color:rgba(124,92,255,.3)}
@keyframes spin{to{transform:rotate(360deg)}}
.orb .core{
  width:44%;aspect-ratio:1/1;border-radius:50%;background:var(--grad);
  display:grid;place-items:center;color:#04121c;font-weight:800;font-size:clamp(24px,4vw,40px);
  box-shadow:0 34px 90px -22px rgba(34,211,238,.85);animation:float 5s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(-9px)}50%{transform:translateY(9px)}}
.orb .tag{
  position:absolute;padding:8px 14px;border-radius:12px;font-size:12.5px;font-weight:600;
  background:rgba(11,18,34,.9);border:1px solid var(--line2);backdrop-filter:blur(8px);white-space:nowrap;
  box-shadow:0 14px 34px -18px rgba(0,0,0,.9);
}
.orb .tag b{color:var(--brand)}
.orb .tag.t1{top:6%;left:2%}
.orb .tag.t2{top:44%;right:-2%}
.orb .tag.t3{bottom:8%;left:10%}

/* ============ 通用区块 ============ */
.sec{padding:92px 0;position:relative}
.sec.alt{background:linear-gradient(180deg,transparent,rgba(255,255,255,.022),transparent)}
.head{max-width:720px}
.head.center{margin:0 auto;text-align:center}
.label{
  display:inline-block;font-size:12.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--brand);margin-bottom:14px;
}
.head h2{font-size:clamp(26px,3vw,38px);line-height:1.24;font-weight:800;letter-spacing:-.012em}
.head p{margin-top:16px;color:var(--muted);font-size:16px}

/* ============ 特性卡 ============ */
.feat{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:52px}
.fcard{
  padding:30px 26px;border-radius:var(--radius);border:1px solid var(--line);
  background:var(--card);position:relative;overflow:hidden;transition:.35s var(--ease);
}
.fcard::after{
  content:"";position:absolute;inset:0;opacity:0;transition:.35s var(--ease);
  background:radial-gradient(420px 220px at 50% 0%,rgba(34,211,238,.14),transparent 70%);
}
.fcard:hover{transform:translateY(-6px);border-color:var(--line2);background:var(--card2)}
.fcard:hover::after{opacity:1}
.fcard .ic{
  width:50px;height:50px;border-radius:14px;display:grid;place-items:center;margin-bottom:20px;
  background:rgba(34,211,238,.1);border:1px solid rgba(34,211,238,.24);color:var(--brand);position:relative;z-index:1;
}
.fcard .ic svg{width:25px;height:25px}
.fcard h3{font-size:18.5px;margin-bottom:10px;position:relative;z-index:1}
.fcard p{font-size:14.6px;color:var(--muted);position:relative;z-index:1}

/* ============ 全球线路 ============ */
.net-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:50px}
.node{
  display:flex;flex-direction:column;gap:6px;padding:20px;border-radius:14px;
  border:1px solid var(--line);background:var(--card);transition:.3s var(--ease);
}
.node:hover{transform:translateY(-4px);border-color:rgba(34,211,238,.4);background:var(--card2)}
.node .city{font-size:16px;font-weight:700}
.node .reg{font-size:12.5px;color:var(--muted);letter-spacing:.06em}
.node .ping{display:flex;align-items:center;gap:7px;font-size:12.5px;color:#3ddc97;margin-top:4px}
.node .ping i{width:6px;height:6px;border-radius:50%;background:#3ddc97;box-shadow:0 0 10px #3ddc97}

/* ============ 步骤 ============ */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:50px;counter-reset:s}
.step{padding:30px 26px;border-radius:var(--radius);border:1px solid var(--line);background:var(--card);position:relative}
.step .no{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-weight:800;
  background:var(--grad);color:#04121c;margin-bottom:18px;
}
.step h3{font-size:17.5px;margin-bottom:9px}
.step p{font-size:14.5px;color:var(--muted)}

/* ============ FAQ ============ */
.faq{max-width:860px;margin:48px auto 0}
.qa{border:1px solid var(--line);border-radius:14px;background:var(--card);margin-bottom:12px;overflow:hidden}
.qa summary{
  list-style:none;cursor:pointer;padding:19px 24px;font-size:16px;font-weight:600;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{
  content:"+";font-size:22px;font-weight:400;color:var(--brand);flex:none;transition:.3s var(--ease);
}
.qa[open] summary::after{transform:rotate(45deg)}
.qa .ans{padding:0 24px 20px;color:var(--muted);font-size:14.6px}

/* ============ CTA 条 ============ */
.cta-band{
  padding:70px 0;background:linear-gradient(120deg,rgba(34,211,238,.12),rgba(124,92,255,.14));
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.cta-band .wrap{display:flex;align-items:center;justify-content:space-between;gap:34px;flex-wrap:wrap}
.cta-band h2{font-size:clamp(23px,2.6vw,32px);font-weight:800;letter-spacing:-.01em}
.cta-band p{color:var(--muted);margin-top:8px}

/* ============ 页脚 ============ */
footer.site{border-top:1px solid var(--line);padding:64px 0 28px;background:rgba(4,8,16,.6)}
.fgrid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:38px}
.fbrand .brand{margin-bottom:18px}
.fbrand p{font-size:14px;color:var(--muted);max-width:330px}
footer.site h5{font-size:14px;margin-bottom:16px;letter-spacing:.04em}
footer.site .fcol a{display:block;font-size:14px;color:var(--muted);padding:5px 0}
footer.site .fcol a:hover{color:var(--brand);transform:translateX(3px)}
.fbottom{
  margin-top:44px;padding-top:22px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:var(--muted);
}
.fbottom .demo{color:rgba(150,161,187,.75)}

/* ============ 下载页 ============ */
.page-head{padding:64px 0 46px;border-bottom:1px solid var(--line)}
.crumb{font-size:13.5px;color:var(--muted);margin-bottom:16px}
.crumb a:hover{color:var(--brand)}
.crumb b{color:var(--txt);font-weight:600}
.page-head h1{font-size:clamp(30px,3.6vw,44px);font-weight:800;letter-spacing:-.014em;line-height:1.2}
.page-head p{margin-top:16px;color:var(--muted);max-width:680px}

.dl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:46px}
.dcard{
  padding:30px 28px;border-radius:var(--radius);border:1px solid var(--line);
  background:var(--card);display:flex;gap:22px;align-items:flex-start;transition:.35s var(--ease);
}
.dcard:hover{transform:translateY(-5px);border-color:var(--line2);background:var(--card2)}
.dcard .d-ic{
  width:58px;height:58px;border-radius:16px;flex:none;display:grid;place-items:center;
  background:rgba(34,211,238,.1);border:1px solid rgba(34,211,238,.24);color:var(--brand);
}
.dcard .d-ic svg{width:29px;height:29px}
.dcard h3{font-size:19px;margin-bottom:6px}
.dcard .meta{font-size:13px;color:var(--muted);margin-bottom:14px}
.dcard ul{list-style:none;margin-bottom:18px}
.dcard ul li{font-size:14px;color:var(--muted);display:flex;gap:9px;align-items:flex-start;padding:3px 0}
.dcard ul li svg{width:15px;height:15px;flex:none;margin-top:5px;color:var(--brand)}
.dcard .dl-actions{display:flex;gap:10px;flex-wrap:wrap}

.dl-note{
  margin-top:26px;padding:22px 26px;border-radius:14px;
  border:1px solid rgba(34,211,238,.24);background:rgba(34,211,238,.07);
  display:flex;gap:14px;align-items:flex-start;font-size:14.5px;color:var(--muted);
}
.dl-note svg{width:20px;height:20px;flex:none;color:var(--brand);margin-top:3px}
.dl-note b{color:var(--txt)}

.sys-table{width:100%;border-collapse:collapse;margin-top:44px;font-size:14.4px}
.sys-table caption{text-align:left;font-size:16px;font-weight:700;padding-bottom:14px;color:var(--txt)}
.sys-table th,.sys-table td{padding:14px 16px;border:1px solid var(--line);text-align:left}
.sys-table th{background:rgba(255,255,255,.045);font-weight:600;white-space:nowrap}
.sys-table td{color:var(--muted)}

/* ============ 404 ============ */
.e404{min-height:calc(100vh - 340px);display:grid;place-items:center;position:relative;padding:80px 0;text-align:center}
.e404 .code{
  font-size:clamp(96px,17vw,190px);font-weight:800;line-height:1;letter-spacing:-.03em;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
  filter:drop-shadow(0 20px 50px rgba(34,211,238,.35));
}
.e404 h1{font-size:clamp(23px,3vw,32px);margin-top:12px;font-weight:800}
.e404 p{color:var(--muted);margin-top:16px;max-width:520px;margin-left:auto;margin-right:auto}
.e404 .ctas{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:32px}
.e404 .quick{margin-top:52px;font-size:14px;color:var(--muted)}
.e404 .quick span{display:block;margin-bottom:12px;font-size:13px;letter-spacing:.14em;text-transform:uppercase}
.e404 .quick ul{list-style:none;display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.e404 .quick a{
  padding:9px 18px;border-radius:999px;border:1px solid var(--line);background:var(--card);font-size:14px;
}
.e404 .quick a:hover{border-color:var(--brand);color:var(--brand)}

/* ============ 动效 ============ */
.rv{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.rv.in{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (max-width:1040px){
  .hero .grid{grid-template-columns:1fr;gap:46px}
  .orb{margin:0 auto;max-width:380px}
  .feat,.net-grid,.steps{grid-template-columns:repeat(2,1fr)}
  .fgrid{grid-template-columns:1fr 1fr}
  .dl-grid{grid-template-columns:1fr}
}
@media (max-width:760px){
  .menu{
    position:fixed;inset:74px 0 auto;flex-direction:column;align-items:stretch;gap:2px;
    padding:16px 20px 24px;background:rgba(7,11,22,.98);backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);transform:translateY(-130%);transition:.4s var(--ease);
  }
  .menu.open{transform:none}
  .menu a{padding:13px 14px;font-size:15.5px}
  .nav>.btn{display:none}
  .burger{display:flex;margin-left:auto}
  .topbar .tb-l span{display:none}
  .hero{padding:66px 0 60px}
  .sec{padding:68px 0}
  .feat,.net-grid,.steps,.fgrid{grid-template-columns:1fr}
  .hero .stats{gap:26px}
  .cta-band .wrap{flex-direction:column;align-items:flex-start}
  .dcard{flex-direction:column;gap:16px}
  .fbottom{flex-direction:column;align-items:flex-start}
}