/* ===== 畅捷通风格静态站 · 共享样式 ===== */
:root{
  --brand:#165dff;
  --brand-dark:#0e42c4;
  --brand-light:#e8f0ff;
  --accent:#ff7a18;
  --ink:#1a2233;
  --ink-2:#4a5468;
  --ink-3:#8a93a6;
  --line:#e6eaf2;
  --bg:#ffffff;
  --bg-soft:#f5f8ff;
  --bg-deep:#0b1733;
  --radius:14px;
  --shadow:0 8px 30px rgba(20,40,90,.08);
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:21px;letter-spacing:.5px}
.logo .mark{
  width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--brand),#36b3ff);
  display:grid;place-items:center;color:#fff;font-size:17px;font-weight:900;
  box-shadow:0 6px 16px rgba(22,93,255,.35);
}
.logo b{color:var(--brand)}
.logo span{font-size:13px;color:var(--ink-3);font-weight:600;align-self:flex-end;margin-bottom:3px}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:15.5px;font-weight:600;color:var(--ink-2);position:relative;padding:6px 0;transition:color .2s}
.nav-links a::after{
  content:"";position:absolute;left:0;bottom:-2px;height:3px;width:0;
  background:var(--brand);border-radius:3px;transition:width .25s;
}
.nav-links a:hover,.nav-links a.active{color:var(--brand)}
.nav-links a.active::after,.nav-links a:hover::after{width:100%}
.nav-cta{
  background:var(--brand);color:#fff;padding:9px 18px;border-radius:999px;
  font-weight:700;font-size:14.5px;transition:transform .15s,box-shadow .2s;
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 8px 20px rgba(22,93,255,.35);color:#fff}
.menu-toggle{display:none;background:none;border:0;cursor:pointer;flex-direction:column;gap:5px}
.menu-toggle span{width:24px;height:2.5px;background:var(--ink);border-radius:2px}

/* ===== Hero ===== */
.hero{
  position:relative;overflow:hidden;
  background:radial-gradient(1200px 500px at 80% -10%,#dbe9ff 0,transparent 60%),
             radial-gradient(900px 500px at 0% 10%,#eef4ff 0,transparent 55%),
             linear-gradient(180deg,#f7faff,#ffffff);
  padding:84px 0 70px;
}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.hero .eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--brand-light);color:var(--brand-dark);
  font-weight:700;font-size:13.5px;padding:6px 14px;border-radius:999px;margin-bottom:18px;
}
.hero h1{font-size:46px;line-height:1.18;font-weight:850;letter-spacing:-.5px;margin-bottom:18px}
.hero h1 .hl{background:linear-gradient(120deg,var(--brand),#36b3ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:18px;color:var(--ink-2);max-width:520px;margin-bottom:28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:15.5px;
  padding:13px 26px;border-radius:999px;transition:transform .15s,box-shadow .2s,background .2s;
}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 10px 24px rgba(22,93,255,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(22,93,255,.4);color:#fff}
.btn-ghost{background:#fff;color:var(--brand);border:1.5px solid var(--brand)}
.btn-ghost:hover{background:var(--brand-light);transform:translateY(-2px)}
.hero-visual{
  position:relative;border-radius:22px;padding:30px;
  background:linear-gradient(160deg,#0e2a6e,#165dff 60%,#36b3ff);
  box-shadow:0 30px 60px rgba(22,93,255,.35);color:#fff;
}
.hero-visual .tag{font-size:13px;opacity:.85;letter-spacing:2px;text-transform:uppercase}
.hero-visual h3{font-size:26px;margin:8px 0 18px;font-weight:800}
.hero-visual .dash{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
.hero-visual .dash .cell{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);border-radius:14px;padding:16px}
.hero-visual .dash .num{font-size:30px;font-weight:850}
.hero-visual .dash .lbl{font-size:13px;opacity:.9}

/* ===== Stats ===== */
.stats{background:var(--bg-deep);color:#fff}
.stats .container{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:40px 22px}
.stat .num{font-size:34px;font-weight:850;background:linear-gradient(120deg,#7db4ff,#36e0ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .lbl{color:#aebbe0;font-size:14.5px;margin-top:4px}

/* ===== Section ===== */
.section{padding:74px 0}
.section.soft{background:var(--bg-soft)}
.sec-head{text-align:center;max-width:680px;margin:0 auto 46px}
.sec-head .kicker{color:var(--brand);font-weight:800;letter-spacing:2px;font-size:13px;text-transform:uppercase}
.sec-head h2{font-size:34px;font-weight:850;margin:10px 0 12px;letter-spacing:-.4px}
.sec-head p{color:var(--ink-2);font-size:16.5px}

/* ===== Cards grid ===== */
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;transition:transform .2s,box-shadow .25s,border-color .2s;
}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:transparent}
.card .ic{
  width:52px;height:52px;border-radius:13px;display:grid;place-items:center;
  background:var(--brand-light);color:var(--brand);font-size:24px;font-weight:800;margin-bottom:16px;
}
.card h3{font-size:20px;font-weight:800;margin-bottom:8px}
.card p{color:var(--ink-2);font-size:15px}
.card .more{display:inline-block;margin-top:14px;color:var(--brand);font-weight:700;font-size:14.5px}
.card .more::after{content:" →";transition:margin .2s}
.card:hover .more::after{margin-left:5px}

/* product card */
.pcard{display:flex;flex-direction:column;gap:6px}
.pcard .badge{display:inline-block;align-self:flex-start;background:var(--brand-light);color:var(--brand-dark);font-size:12.5px;font-weight:700;padding:4px 11px;border-radius:999px;margin-bottom:10px}
.pcard h3{font-size:22px;font-weight:850}
.pcard .desc{color:var(--ink-2);font-size:15px;flex:1}
.pcard .feats{list-style:none;margin:14px 0;display:grid;gap:8px}
.pcard .feats li{display:flex;gap:9px;align-items:flex-start;font-size:14.5px;color:var(--ink-2)}
.pcard .feats li::before{content:"✓";color:var(--brand);font-weight:900;flex:none}

/* ===== Feature split ===== */
.split{display:grid;grid-template-columns:1fr 1fr;gap:54px;align-items:center}
.split .visual{
  border-radius:20px;min-height:320px;padding:34px;color:#fff;
  background:linear-gradient(160deg,#0e2a6e,#165dff 65%,#36b3ff);
  box-shadow:0 26px 50px rgba(22,93,255,.3);
}
.split h2{font-size:32px;font-weight:850;margin-bottom:14px;letter-spacing:-.3px}
.split p{color:var(--ink-2);font-size:16px;margin-bottom:18px}
.flist{list-style:none;display:grid;gap:14px}
.flist li{display:flex;gap:13px;align-items:flex-start}
.flist .dot{flex:none;width:26px;height:26px;border-radius:8px;background:var(--brand-light);color:var(--brand);display:grid;place-items:center;font-weight:900;font-size:14px;margin-top:2px}
.flist b{display:block;font-size:16px;font-weight:700}
.flist span{color:var(--ink-2);font-size:14.5px}

/* ===== Partner card ===== */
.partner-card{display:flex;gap:26px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;box-shadow:0 10px 30px rgba(20,40,90,.06)}
.partner-badge{flex:none;width:84px;height:84px;border-radius:16px;background:linear-gradient(135deg,var(--brand),var(--brand-dark));color:#fff;display:grid;place-items:center;font-size:26px;font-weight:850;letter-spacing:1px}
.partner-body{flex:1}
.partner-body h3{font-size:22px;font-weight:800;margin-bottom:6px}
.partner-tag{display:inline-block;background:var(--brand-light);color:var(--brand);font-weight:700;font-size:13.5px;padding:5px 12px;border-radius:999px;margin-bottom:14px}
.partner-body p{color:var(--ink-2);font-size:15px;line-height:1.75;margin-bottom:16px}
.partner-body .flist{margin-top:4px}
@media(max-width:680px){.partner-card{flex-direction:column;gap:18px;padding:22px}}

/* ===== Timeline ===== */
.timeline{position:relative;margin-top:20px;padding-left:26px}
.timeline::before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;background:var(--line)}
.tl-item{position:relative;padding:0 0 30px 26px}
.tl-item::before{content:"";position:absolute;left:-26px;top:5px;width:16px;height:16px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 4px var(--brand-light)}
.tl-item .yr{font-weight:850;color:var(--brand);font-size:16px}
.tl-item h4{font-size:17px;margin:3px 0 5px}
.tl=true .tl-item p{color:var(--ink-2);font-size:14.5px}

/* ===== Case ===== */
.case{padding:0;overflow:hidden}
.case .top{padding:26px;background:linear-gradient(135deg,#102a66,#165dff);color:#fff}
.case .top .ind{font-size:12.5px;opacity:.85;letter-spacing:1px}
.case .top h3{font-size:21px;font-weight:850;margin-top:6px}
.case .body{padding:24px 26px}
.case .body .quote{font-size:15px;color:var(--ink-2);border-left:3px solid var(--brand);padding-left:14px;margin-bottom:16px}
.case .metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;text-align:center}
.case .metrics .m .v{font-size:22px;font-weight:850;color:var(--brand)}
.case .metrics .m .k{font-size:12.5px;color:var(--ink-3)}

/* ===== CTA banner ===== */
.cta{
  margin:0 auto;max-width:var(--maxw);
  background:linear-gradient(120deg,#0e2a6e,#165dff 60%,#36b3ff);
  border-radius:22px;padding:54px 48px;color:#fff;text-align:center;
  box-shadow:0 26px 60px rgba(22,93,255,.32);
}
.cta h2{font-size:32px;font-weight:850;margin-bottom:12px}
.cta p{font-size:17px;opacity:.92;margin-bottom:24px}

/* ===== Breadcrumb ===== */
.crumb{background:var(--bg-soft);border-bottom:1px solid var(--line);padding:16px 0;font-size:14px;color:var(--ink-3)}
.crumb a{color:var(--brand);font-weight:600}
.crumb span{margin:0 8px;color:var(--ink-3)}

/* ===== Page hero (inner pages) ===== */
.phero{background:linear-gradient(160deg,#0e2a6e,#165dff 70%,#36b3ff);color:#fff;padding:60px 0}
.phero .kicker{font-size:13px;letter-spacing:2px;opacity:.85;text-transform:uppercase}
.phero h1{font-size:40px;font-weight:850;margin:10px 0 12px}
.phero p{font-size:17px;opacity:.92;max-width:640px}

/* ===== Footer ===== */
.site-footer{background:var(--bg-deep);color:#c7d2ee;padding:56px 0 26px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr 1fr;gap:30px}
.footer-grid .brand .logo{color:#fff;margin-bottom:14px}
.footer-grid .brand p{font-size:14px;color:#9fb0d8;max-width:300px}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:14px;font-weight:800}
.footer-col a{display:block;font-size:14px;color:#a9b8de;padding:5px 0;transition:color .2s}
.footer-col a:hover{color:#fff}
.f-contact{font-size:14px;color:#a9b8de;padding:4px 0;line-height:1.6}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:38px;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#8295c2}
.footer-bottom .note{color:#6f82b3}

/* ===== Responsive ===== */
@media(max-width:980px){
  .hero-grid,.split{grid-template-columns:1fr;gap:34px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .stats .container{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .menu-toggle{display:flex}
  .nav-links{
    position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;gap:0;
    padding:10px 22px 20px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);
    display:none;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 0;border-bottom:1px solid var(--line);width:100%}
  .nav-cta{margin-top:12px;text-align:center}
  .hero h1{font-size:34px}
  .grid-3,.grid-2,.grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .sec-head h2,.cta h2,.phero h1{font-size:27px}
}