/* ===================== 基础与变量 ===================== */
:root{
  --bg:#0f1830;
  --bg-2:#121d3d;
  --bg-3:#1a2858;
  --panel:rgba(36,56,110,.55);
  --panel-2:rgba(46,70,130,.45);
  --line:rgba(120,170,255,.22);
  --line-2:rgba(120,170,255,.40);
  --txt:#f2f6ff;
  --txt-2:#b8c5e8;
  --txt-3:#8595c0;
  --cyan:#34d9ee;
  --blue:#4a90ff;
  --indigo:#7c8af5;
  --violet:#a07bf5;
  --green:#34d399;
  --emerald:#10b981;
  --amber:#fbbf24;
  --grad:linear-gradient(135deg,#34d399 0%,#22d3ee 40%,#4a90ff 75%,#7c8af5 100%);
  --grad-2:linear-gradient(135deg,#34d399 0%,#22d3ee 100%);
  --grad-green:linear-gradient(135deg,#34d399 0%,#10b981 100%);
  --glow:0 0 40px rgba(52,211,153,.30);
  --radius:18px;
  --max:1240px;
  --shadow:0 24px 60px -20px rgba(0,0,0,.45);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--txt);
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:rgba(34,211,238,.3);color:#fff}

/* 全局背景装饰 */
.bg-deco{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none}
.bg-deco::before{
  content:"";position:absolute;inset:-20%;
  background:
    radial-gradient(620px 620px at 12% 18%,rgba(34,211,238,.14),transparent 60%),
    radial-gradient(720px 720px at 88% 12%,rgba(99,102,241,.16),transparent 60%),
    radial-gradient(640px 640px at 60% 92%,rgba(139,92,246,.12),transparent 60%);
}
.grid-overlay{
  position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(96,165,250,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(96,165,250,.05) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 80% 70% at 50% 30%,#000 40%,transparent 100%);
}

/* ===================== 容器 ===================== */
.wrap{max-width:var(--max);margin:0 auto;padding:0 28px}
.section{padding:110px 0;position:relative}
.section-head{text-align:center;max-width:760px;margin:0 auto 64px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--cyan);font-weight:600;margin-bottom:18px;
}
.eyebrow::before{content:"";width:24px;height:1px;background:var(--cyan)}
.section-head h2{
  font-size:clamp(30px,4vw,46px);font-weight:800;line-height:1.2;
  letter-spacing:-.01em;margin-bottom:18px;
}
.section-head h2 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.section-head p{color:var(--txt-2);font-size:17px}

/* ===================== 导航 ===================== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:all .35s ease;
}
.nav-inner{
  max-width:var(--max);margin:0 auto;padding:18px 28px;
  display:flex;align-items:center;justify-content:space-between;
  transition:all .35s ease;
}
.nav.scrolled .nav-inner{
  background:rgba(15,24,48,.78);backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);
  padding:14px 28px;border-radius:0 0 18px 18px;
  margin:8px auto 0;max-width:1180px;
}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;font-size:19px}
.brand .logo{
  width:42px;height:42px;border-radius:11px;background:rgba(255,255,255,.06);
  border:1px solid var(--line-2);
  display:grid;place-items:center;box-shadow:var(--glow);
  position:relative;overflow:hidden;
}
.brand .logo img{width:30px;height:30px;object-fit:contain}
.brand .name b{display:block;font-size:19px;line-height:1.1}
.brand .name span{display:block;font-size:10px;letter-spacing:.22em;color:var(--txt-2);font-weight:500;text-transform:uppercase}
.nav-links{display:flex;align-items:center;gap:34px}
.nav-links a{font-size:15px;color:var(--txt-2);font-weight:500;transition:color .2s;position:relative}
.nav-links a:hover{color:var(--txt)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--grad);transition:width .3s}
.nav-links a:hover::after{width:100%}
.nav-links a.is-active{color:var(--txt)}
.nav-links a.is-active::after{width:100%}
.nav-links .nav-cta{
  padding:10px 22px;border-radius:30px;font-weight:600;font-size:14px;
  background:var(--grad);color:#fff !important;transition:transform .25s,box-shadow .25s;
}
.nav-links .nav-cta:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(34,211,238,.4)}
.menu-btn{display:none;background:none;border:none;color:var(--txt);cursor:pointer;padding:8px}
.menu-btn svg{width:26px;height:26px}

/* ===================== Hero ===================== */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  padding:120px 0 80px;overflow:hidden;
}
.hero-bg{position:absolute;inset:0;z-index:-2}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.72}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(circle at 70% 30%,rgba(52,211,153,.18),transparent 50%),
    linear-gradient(180deg,rgba(15,24,48,.25) 0%,rgba(15,24,48,.7) 70%,var(--bg) 100%);
}
.hero-orb{position:absolute;border-radius:50%;filter:blur(60px);opacity:.55;z-index:-1;animation:float 12s ease-in-out infinite}
.hero-orb.o1{width:300px;height:300px;background:rgba(52,211,153,.45);top:20%;left:-60px}
.hero-orb.o2{width:380px;height:380px;background:rgba(124,138,245,.40);bottom:10%;right:-80px;animation-delay:-4s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-28px)}}

.hero-inner{position:relative;z-index:2;max-width:var(--max);margin:0 auto;padding:0 28px}
.hero-badge{
  display:inline-flex;align-items:center;gap:10px;padding:8px 18px;
  border-radius:40px;background:rgba(34,211,238,.1);border:1px solid rgba(34,211,238,.3);
  font-size:13px;color:var(--cyan);font-weight:600;margin-bottom:28px;
}
.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{
  font-size:clamp(40px,6vw,78px);font-weight:800;line-height:1.08;
  letter-spacing:-.02em;margin-bottom:26px;max-width:980px;
}
.hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero h1 .thin{font-weight:300;color:var(--txt-2)}
.hero p.lead{
  font-size:clamp(16px,2vw,20px);color:var(--txt-2);max-width:680px;
  margin-bottom:42px;line-height:1.7;
}
.hero-actions{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:60px}
.btn{
  display:inline-flex;align-items:center;gap:10px;padding:15px 32px;
  border-radius:40px;font-weight:600;font-size:16px;transition:all .3s;cursor:pointer;border:none;
}
.btn-primary{background:var(--grad);color:#04122b;box-shadow:0 12px 40px rgba(59,130,246,.4)}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 18px 50px rgba(34,211,238,.5)}
.btn-ghost{background:rgba(255,255,255,.04);color:var(--txt);border:1px solid var(--line-2)}
.btn-ghost:hover{background:rgba(255,255,255,.08);border-color:var(--cyan)}
.btn svg{width:18px;height:18px}

.hero-stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
  padding:32px;border-radius:var(--radius);
  background:var(--panel);backdrop-filter:blur(20px);
  border:1px solid var(--line);max-width:920px;
}
.stat .num{font-size:clamp(28px,3.5vw,42px);font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.stat .lbl{font-size:13px;color:var(--txt-2);margin-top:6px}
.scroll-hint{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);color:var(--txt-3);font-size:12px;letter-spacing:.2em;text-transform:uppercase;display:flex;flex-direction:column;align-items:center;gap:8px;animation:bounce 2s infinite}
.scroll-hint .line{width:1px;height:40px;background:linear-gradient(var(--cyan),transparent)}
@keyframes bounce{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}

/* ===================== 关于 ===================== */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.about-text h3{font-size:28px;font-weight:700;margin-bottom:20px;line-height:1.3}
.about-text p{color:var(--txt-2);margin-bottom:18px;font-size:16px}
.about-text ul{list-style:none;margin:24px 0}
.about-text ul li{display:flex;gap:12px;margin-bottom:14px;color:var(--txt-2)}
.about-text ul li .ck{color:var(--cyan);flex-shrink:0;margin-top:4px}
.about-text ul li svg{width:18px;height:18px}
.about-visual{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow)}
.about-visual img{width:100%;height:100%;object-fit:cover}
.about-visual::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(15,24,48,.6) 100%)}
.about-tag{position:absolute;left:24px;bottom:24px;z-index:2;padding:12px 20px;border-radius:12px;background:rgba(15,24,48,.7);backdrop-filter:blur(10px);border:1px solid var(--line)}
.about-tag b{font-size:22px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.about-tag span{display:block;font-size:12px;color:var(--txt-2)}

/* 能力标签 */
.cap-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.cap-chip{padding:8px 16px;border-radius:30px;background:rgba(59,130,246,.08);border:1px solid var(--line);font-size:13px;color:var(--txt);font-weight:500}

/* ===================== 业务版块 ===================== */
.biz-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.biz-card{
  position:relative;border-radius:var(--radius);overflow:hidden;
  background:var(--panel);border:1px solid var(--line);
  transition:all .4s;cursor:default;
}
.biz-card:hover{transform:translateY(-8px);border-color:var(--line-2);box-shadow:var(--shadow)}
.biz-img{height:200px;overflow:hidden;position:relative}
.biz-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.biz-card:hover .biz-img img{transform:scale(1.08)}
.biz-img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 30%,rgba(15,24,48,.85) 100%)}
.biz-icon{
  position:absolute;top:16px;left:16px;z-index:2;width:44px;height:44px;
  border-radius:12px;background:rgba(15,24,48,.7);backdrop-filter:blur(10px);
  border:1px solid var(--line-2);display:grid;place-items:center;
}
.biz-icon svg{width:24px;height:24px;color:var(--cyan)}
.biz-body{padding:26px}
.biz-body .tag{font-size:12px;color:var(--cyan);font-weight:600;letter-spacing:.1em;text-transform:uppercase}
.biz-body h3{font-size:21px;font-weight:700;margin:8px 0 12px}
.biz-body p{color:var(--txt-2);font-size:14.5px;line-height:1.7}
.biz-feats{list-style:none;margin-top:16px;display:flex;flex-direction:column;gap:8px}
.biz-feats li{display:flex;align-items:flex-start;gap:8px;font-size:13.5px;color:var(--txt-2)}
.biz-feats li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--cyan);margin-top:8px;flex-shrink:0}

/* ===================== 产品详情 ===================== */
.product{padding:0 0 40px}
.product:nth-child(even) .prod-grid{direction:rtl}
.product:nth-child(even) .prod-grid>*{direction:ltr}
.prod-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:56px;align-items:center;margin-bottom:120px}
.prod-visual{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow)}
.prod-visual img{width:100%;height:420px;object-fit:cover}
.prod-visual::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(52,211,153,.08),transparent 50%,rgba(124,138,245,.16))}
.prod-badge{position:absolute;top:20px;right:20px;z-index:2;padding:8px 16px;border-radius:30px;background:rgba(15,24,48,.75);backdrop-filter:blur(10px);border:1px solid var(--line-2);font-size:12px;color:var(--green);font-weight:600;letter-spacing:.1em}
.prod-text .num{font-size:13px;color:var(--cyan);font-weight:700;letter-spacing:.2em;margin-bottom:14px}
.prod-text h3{font-size:32px;font-weight:800;margin-bottom:8px;line-height:1.2}
.prod-text .sub{color:var(--txt-2);font-size:16px;margin-bottom:24px;font-weight:500}
.prod-text p{color:var(--txt-2);margin-bottom:20px;font-size:15px}
.prod-feats{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:28px 0}
.prod-feat{padding:18px;border-radius:14px;background:var(--panel-2);border:1px solid var(--line)}
.prod-feat .ft{display:flex;align-items:center;gap:10px;font-weight:700;font-size:14px;margin-bottom:8px}
.prod-feat .ft svg{width:20px;height:20px;color:var(--cyan)}
.prod-feat p{font-size:13px;color:var(--txt-2);margin:0;line-height:1.6}
.prod-metrics{display:flex;gap:32px;margin-top:24px;padding-top:24px;border-top:1px solid var(--line)}
.prod-metrics .m .v{font-size:26px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.prod-metrics .m .l{font-size:12px;color:var(--txt-3);margin-top:4px}

/* ===================== 案例时间线 ===================== */
.cases-bg{position:absolute;inset:0;z-index:-1;opacity:.18}
.cases-bg img{width:100%;height:100%;object-fit:cover}
.timeline{position:relative;max-width:980px;margin:0 auto}
.timeline::before{content:"";position:absolute;left:50%;top:0;bottom:0;width:2px;background:linear-gradient(var(--cyan),var(--indigo),var(--violet));transform:translateX(-50%)}
.tl-item{position:relative;padding:0 0 70px;display:grid;grid-template-columns:1fr 60px 1fr;align-items:start;gap:0}
.tl-item:last-child{padding-bottom:0}
.tl-dot{
  width:22px;height:22px;border-radius:50%;background:var(--bg);
  border:3px solid var(--cyan);box-shadow:0 0 20px rgba(34,211,238,.6);
  justify-self:center;margin-top:6px;position:relative;z-index:2;
}
.tl-item:nth-child(even) .tl-content{grid-column:3;text-align:left;padding-left:24px}
.tl-item:nth-child(odd) .tl-content{grid-column:1;text-align:right;padding-right:24px}
.tl-item:nth-child(odd) .tl-empty{grid-column:3}
.tl-item:nth-child(even) .tl-empty{grid-column:1}
.tl-content .year{font-size:30px;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.tl-content .venues{margin-top:12px;display:flex;flex-direction:column;gap:6px}
.tl-item:nth-child(odd) .tl-content .venues{align-items:flex-end}
.tl-content .venues span{display:inline-block;padding:6px 14px;border-radius:20px;background:var(--panel);border:1px solid var(--line);font-size:13px;color:var(--txt)}
.tl-content .venues span.hot{border-color:rgba(245,158,11,.4);color:var(--amber)}

/* ===================== 研发能力 ===================== */
.rd-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.rd-text h3{font-size:28px;margin-bottom:20px;font-weight:700}
.rd-text p{color:var(--txt-2);margin-bottom:18px}
.rd-stack{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:32px}
.rd-card{padding:22px;border-radius:14px;background:var(--panel);border:1px solid var(--line);transition:all .3s}
.rd-card:hover{border-color:var(--line-2);transform:translateY(-4px)}
.rd-card .ic{width:42px;height:42px;border-radius:11px;background:var(--grad-2);display:grid;place-items:center;margin-bottom:14px}
.rd-card .ic svg{width:22px;height:22px;color:#fff}
.rd-card h4{font-size:16px;font-weight:700;margin-bottom:8px}
.rd-card p{font-size:13px;color:var(--txt-2);line-height:1.6}

/* 能力雷达条 */
.skill-bars{display:flex;flex-direction:column;gap:18px;margin-top:30px}
.skill{display:grid;grid-template-columns:140px 1fr 50px;align-items:center;gap:14px}
.skill .nm{font-size:14px;color:var(--txt)}
.skill .track{height:8px;border-radius:8px;background:rgba(255,255,255,.06);overflow:hidden}
.skill .fill{height:100%;border-radius:8px;background:var(--grad);width:0;transition:width 1.2s cubic-bezier(.2,.8,.2,1)}
.skill .pct{font-size:13px;color:var(--cyan);font-weight:700;text-align:right}

/* ===================== 生态合作 ===================== */
.eco{padding:70px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.eco-row{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-top:30px}
.eco-chip{padding:12px 24px;border-radius:30px;background:var(--panel);border:1px solid var(--line);font-size:14px;color:var(--txt-2);font-weight:500;transition:all .3s}
.eco-chip:hover{border-color:var(--cyan);color:var(--txt);transform:translateY(-2px)}

/* ===================== CTA ===================== */
.cta{position:relative;padding:120px 0;text-align:center;overflow:hidden}
.cta-bg{position:absolute;inset:0;z-index:-1}
.cta-bg img{width:100%;height:100%;object-fit:cover;opacity:.35}
.cta-bg::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 50%,rgba(15,24,48,.5),rgba(15,24,48,.88))}
.cta-inner{position:relative;max-width:760px;margin:0 auto;padding:0 28px}
.cta h2{font-size:clamp(32px,5vw,52px);font-weight:800;margin-bottom:20px;line-height:1.2}
.cta h2 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.cta p{color:var(--txt-2);font-size:18px;margin-bottom:36px}
.cta-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ===================== Footer ===================== */
.footer{background:var(--bg-2);border-top:1px solid var(--line);padding:70px 0 30px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:48px;margin-bottom:50px}
.foot-brand .brand{margin-bottom:18px}
.foot-brand p{color:var(--txt-2);font-size:14px;max-width:340px}
.foot-col h5{font-size:15px;font-weight:700;margin-bottom:18px;color:var(--txt)}
.foot-col ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.foot-col ul a{color:var(--txt-2);font-size:14px;transition:color .2s}
.foot-col ul a:hover{color:var(--cyan)}
.foot-contact li{color:var(--txt-2);font-size:14px;display:flex;gap:10px;align-items:flex-start}
.foot-contact svg{width:18px;height:18px;color:var(--cyan);flex-shrink:0;margin-top:3px}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px;padding-top:28px;border-top:1px solid var(--line)}
.foot-bottom p{color:var(--txt-3);font-size:13px}
.foot-bottom .links{display:flex;gap:20px}
.foot-bottom .links a{color:var(--txt-3);font-size:13px;transition:color .2s}
.foot-bottom .links a:hover{color:var(--cyan)}

/* ===================== 滚动动画 ===================== */
.reveal{opacity:0;transform:translateY(40px);transition:opacity .8s,transform .8s}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.1s}.reveal.d2{transition-delay:.2s}.reveal.d3{transition-delay:.3s}.reveal.d4{transition-delay:.4s}

/* ===================== 移动端 ===================== */
@media(max-width:980px){
  .nav-links{display:none}
  .menu-btn{display:block}
  .nav.scrolled .nav-inner{padding:12px 20px}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .about-grid,.prod-grid,.rd-grid{grid-template-columns:1fr;gap:36px}
  .product:nth-child(even) .prod-grid{direction:ltr}
  .biz-grid{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr 1fr;gap:36px}
  .timeline::before{left:20px}
  .tl-item{grid-template-columns:40px 1fr}
  .tl-dot{justify-self:start}
  .tl-item:nth-child(even) .tl-content,.tl-item:nth-child(odd) .tl-content{grid-column:2;text-align:left;padding-left:20px;padding-right:0}
  .tl-item:nth-child(odd) .tl-content .venues,.tl-item:nth-child(even) .tl-content .venues{align-items:flex-start}
  .tl-item:nth-child(odd) .tl-empty,.tl-item:nth-child(even) .tl-empty{display:none}
  .prod-feats{grid-template-columns:1fr}
}
@media(max-width:640px){
  .wrap{padding:0 20px}
  .section{padding:80px 0}
  .biz-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:1fr 1fr;padding:24px}
  .skill{grid-template-columns:110px 1fr 40px}
}

/* 移动菜单展开 */
.mobile-menu{
  display:none;position:fixed;top:70px;left:0;right:0;z-index:99;
  background:rgba(15,24,48,.96);backdrop-filter:blur(20px);
  border-bottom:1px solid var(--line);padding:20px 28px;
  flex-direction:column;gap:8px;
}
.mobile-menu.open{display:flex}
.mobile-menu a{padding:12px 0;color:var(--txt-2);font-size:16px;border-bottom:1px solid var(--line)}
.mobile-menu a:last-child{border:none}

/* ===================== 右侧数字导航 ===================== */
.page-nav{
  position:fixed;right:28px;top:50%;transform:translateY(-50%);
  z-index:90;display:flex;flex-direction:column;gap:6px;
}
.page-nav__item{
  display:flex;align-items:center;justify-content:flex-end;gap:12px;
  cursor:pointer;background:none;border:none;padding:6px 0;
  color:var(--txt-3);font-family:inherit;transition:all .35s ease;
}
.page-nav__num{
  font-size:14px;font-weight:700;letter-spacing:.06em;
  color:var(--txt-3);transition:all .35s ease;
  font-variant-numeric:tabular-nums;
}
.page-nav__label{
  font-size:13px;color:var(--txt-2);white-space:nowrap;
  opacity:0;transform:translateX(-8px);transition:all .35s ease;
  font-weight:500;
}
.page-nav__bar{
  width:2px;height:18px;border-radius:2px;background:var(--line);
  transition:all .35s ease;flex-shrink:0;
}
.page-nav__item:hover .page-nav__num{color:var(--cyan)}
.page-nav__item:hover .page-nav__label{opacity:.8;transform:translateX(0)}
.page-nav__item:hover .page-nav__bar{background:var(--cyan);height:22px}
.page-nav__item.is-active .page-nav__num{
  font-size:18px;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.page-nav__item.is-active .page-nav__label{opacity:1;transform:translateX(0);color:var(--txt)}
.page-nav__item.is-active .page-nav__bar{background:var(--grad);height:28px;box-shadow:0 0 10px rgba(34,211,238,.5)}

/* 小屏隐藏数字导航，避免与内容冲突 */
@media(max-width:768px){
  .page-nav{display:none}
}