:root{
  --blue:#1F4E79;
  --blue-2:#2E74B5;
  --blue-3:#4a90d9;
  --ink:#0f1e2e;
  --muted:#5a6472;
  --line:#e3e8ef;
  --bg:#f4f6f9;
  --white:#fff;
  --accent:#E67E22;
  --green:#1a9d5c;
  --radius:16px;
  --shadow:0 10px 30px rgba(20,45,80,.08);
  --shadow-lg:0 24px 60px rgba(20,45,80,.16);
  --maxw:1160px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--white);line-height:1.7;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul,ol{list-style:none;}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px;}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:15px;font-weight:600;padding:13px 26px;border-radius:999px;
  cursor:pointer;border:1px solid transparent;transition:.25s;white-space:nowrap;
}
.btn-primary{background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;box-shadow:0 10px 24px rgba(31,78,121,.28);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(31,78,121,.36);}
.btn-ghost{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.55);backdrop-filter:blur(4px);}
.btn-ghost:hover{background:rgba(255,255,255,.22);}
.btn-light{background:#fff;color:var(--blue);}
.btn-light:hover{transform:translateY(-2px);}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.86);backdrop-filter:blur(14px);border-bottom:1px solid transparent;transition:.3s;}
.site-header.scrolled{border-bottom-color:var(--line);box-shadow:0 6px 22px rgba(20,45,80,.07);}
.header-inner{display:flex;align-items:center;gap:24px;height:72px;}
.brand{display:flex;align-items:center;gap:12px;}
.brand-logo{width:46px;height:44px;object-fit:contain;border-radius:8px;}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-text b{font-size:16px;letter-spacing:.5px;}
.brand-text i{font-size:11px;color:var(--muted);font-style:normal;letter-spacing:.5px;}
.nav{margin-left:auto;display:flex;gap:21px;}
.nav a{font-size:14.5px;color:#2b3646;font-weight:500;position:relative;padding:6px 0;transition:.2s;}
.nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--blue-2);transition:.25s;}
.nav a:hover{color:var(--blue);}
.nav a:hover::after{width:100%;}
.nav-cta{background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;font-size:14px;font-weight:600;padding:10px 20px;border-radius:999px;margin-left:10px;box-shadow:0 8px 18px rgba(31,78,121,.24);transition:.25s;}
.nav-cta:hover{transform:translateY(-2px);}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px;}
.nav-toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.25s;}

/* ===== Language switch ===== */
.lang-switch{display:flex;align-items:center;gap:2px;margin-left:14px;background:#eef2f7;border-radius:999px;padding:4px;}
.lang-switch a{font-size:12.5px;font-weight:600;color:var(--muted);padding:6px 12px;border-radius:999px;transition:.2s;white-space:nowrap;}
.lang-switch a.active{background:#fff;color:var(--blue);box-shadow:0 2px 8px rgba(20,45,80,.12);}
.lang-switch a:hover{color:var(--blue);}

/* ===== Hero ===== */
.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#12345a,#1F4E79 45%,#2E74B5);}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.22;}
.hero-overlay{position:absolute;inset:0;background:
  radial-gradient(1000px 500px at 80% 10%,rgba(74,144,217,.45),transparent 60%),
  linear-gradient(135deg,rgba(18,52,90,.94),rgba(31,78,121,.82) 55%,rgba(46,116,181,.7));}
.hero-inner{position:relative;z-index:2;display:grid;grid-template-columns:1.35fr .95fr;gap:48px;align-items:center;padding:82px 22px 92px;color:#fff;}
.hero-tag{display:inline-block;font-size:12.5px;letter-spacing:2px;border:1px solid rgba(255,255,255,.5);padding:6px 16px;border-radius:999px;margin-bottom:22px;}
.hero h1{font-size:48px;line-height:1.2;letter-spacing:1px;font-weight:800;}
.hero-sub{margin-top:20px;font-size:16px;color:rgba(255,255,255,.88);line-height:1.9;}
.hero-actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap;}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:44px;padding-top:26px;border-top:1px solid rgba(255,255,255,.2);}
.hero-stats b{display:block;font-size:26px;font-weight:800;letter-spacing:.5px;}
.hero-stats b em{font-size:14px;font-style:normal;font-weight:600;margin-left:2px;}
.hero-stats span{font-size:12px;color:rgba(255,255,255,.75);}
.hero-card{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.24);border-radius:20px;padding:26px;backdrop-filter:blur(10px);box-shadow:var(--shadow-lg);}
.hero-card-top{font-size:13px;letter-spacing:1.5px;color:rgba(255,255,255,.85);padding-bottom:14px;border-bottom:1px solid rgba(255,255,255,.2);}
.hero-flow{margin-top:8px;}
.hero-flow li{display:flex;align-items:center;gap:12px;font-size:14.5px;padding:11px 0;border-bottom:1px dashed rgba(255,255,255,.16);}
.hero-flow li:last-child{border-bottom:none;}
.hero-flow .dot{width:9px;height:9px;border-radius:50%;background:var(--blue-3);box-shadow:0 0 0 4px rgba(74,144,217,.28);flex-shrink:0;}
.hero-card-foot{margin-top:16px;font-size:12px;letter-spacing:1px;color:rgba(255,255,255,.7);text-align:center;}

/* ===== Sections ===== */
.section{padding:88px 0;}
.section-alt{background:var(--bg);}
.section-dark{background:linear-gradient(135deg,#12345a,#1F4E79 60%,#2E74B5);color:#fff;}
.section-head{text-align:center;max-width:720px;margin:0 auto 52px;}
.eyebrow{display:inline-block;font-size:12.5px;letter-spacing:2px;color:var(--blue-2);font-weight:700;text-transform:uppercase;margin-bottom:14px;}
.eyebrow-light{color:#8fc0f0;}
.section-head h2{font-size:34px;letter-spacing:.5px;font-weight:800;line-height:1.3;}
.section-desc{margin-top:16px;color:var(--muted);font-size:16px;}
.section-dark .section-desc{color:rgba(255,255,255,.8);}

.grid{display:grid;gap:22px;}
.grid-4{grid-template-columns:repeat(4,1fr);}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow);transition:.28s;}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:#cfe0f4;}
.service .svc-icon{font-size:34px;width:66px;height:66px;display:flex;align-items:center;justify-content:center;border-radius:18px;background:linear-gradient(135deg,#eaf2fb,#dbe9f8);margin-bottom:18px;}
.service h3{font-size:18px;margin-bottom:10px;}
.service p{font-size:14px;color:var(--muted);line-height:1.85;}

/* ===== Products ===== */
.product-wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:48px;align-items:center;}
.product-visual{position:relative;background:linear-gradient(160deg,#eef4fb,#dce9f7);border-radius:24px;padding:34px;box-shadow:var(--shadow);}
.product-visual img{margin:0 auto;max-height:430px;width:auto;border-radius:12px;}
.product-badge{position:absolute;top:20px;left:20px;background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;font-size:12px;font-weight:700;letter-spacing:1px;padding:7px 16px;border-radius:999px;}
.series-tabs{display:flex;gap:10px;margin-bottom:22px;}
.series-tabs .tab{font-family:inherit;font-size:14.5px;font-weight:600;color:var(--muted);background:#eef2f7;border:none;padding:11px 20px;border-radius:999px;cursor:pointer;transition:.25s;}
.series-tabs .tab.active{background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;box-shadow:0 8px 18px rgba(31,78,121,.24);}
.series-panel h3{font-size:22px;margin-bottom:12px;}
.series-panel>p{color:var(--muted);font-size:15px;margin-bottom:18px;}
.spec-list{display:grid;grid-template-columns:1fr 1fr;gap:10px 20px;margin-bottom:20px;}
.spec-list li{font-size:14px;color:#334155;padding-left:22px;position:relative;}
.spec-list li::before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:700;}
.spec-list li b{color:var(--blue);}
.product-note{font-size:12.5px;color:#94a0b0;margin-bottom:22px;}
.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:56px;}
.gallery figure{border-radius:14px;overflow:hidden;aspect-ratio:4/3;box-shadow:var(--shadow);}
.gallery img{width:100%;height:100%;object-fit:cover;transition:.4s;}
.gallery figure:hover img{transform:scale(1.06);}
.gallery-cap{text-align:center;font-size:12.5px;color:#94a0b0;margin-top:16px;}

/* ===== Timeline ===== */
.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.timeline li{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;box-shadow:var(--shadow);}
.timeline .step-no{font-size:30px;font-weight:800;color:#cfe0f4;letter-spacing:1px;}
.timeline h4{font-size:18px;margin:8px 0 10px;}
.timeline p{font-size:14px;color:var(--muted);line-height:1.8;}
.loop-banner{margin-top:40px;background:linear-gradient(135deg,var(--blue),var(--blue-2));border-radius:20px;padding:36px 40px;display:flex;align-items:center;justify-content:space-between;gap:28px;color:#fff;flex-wrap:wrap;box-shadow:var(--shadow-lg);}
.loop-text h3{font-size:22px;margin-bottom:8px;}
.loop-text p{font-size:14.5px;color:rgba(255,255,255,.85);max-width:720px;}

/* ===== Mini program ===== */
.mini-wrap{display:grid;grid-template-columns:1.25fr .75fr;gap:56px;align-items:center;}
.mini-copy h2{font-size:30px;line-height:1.35;margin-bottom:16px;}
.mini-copy>p{color:rgba(255,255,255,.85);font-size:15.5px;}
.mini-features{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:26px 0;}
.mini-features li{display:flex;gap:12px;align-items:flex-start;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.16);border-radius:12px;padding:14px;font-size:13.5px;line-height:1.55;}
.mini-features li i{font-style:normal;font-size:20px;}
.mini-features li b{display:block;font-size:14.5px;margin-bottom:2px;}
.mini-features li span{color:rgba(255,255,255,.8);}
.mini-tip{font-size:13.5px;color:#bcd9f5;}
.mini-qr{text-align:center;}
.qr-frame{background:#fff;border-radius:24px;padding:18px;box-shadow:var(--shadow-lg);display:inline-block;}
.qr-frame img{width:260px;height:260px;border-radius:12px;}
.qr-cap{margin-top:20px;font-size:17px;font-weight:700;}
.qr-sub{font-size:13px;color:rgba(255,255,255,.75);letter-spacing:1px;margin-top:4px;}

/* ===== About ===== */
.about-wrap{display:grid;grid-template-columns:1.25fr .75fr;gap:52px;align-items:start;}
.about-text h2{font-size:32px;margin:6px 0 20px;}
.about-text p{color:var(--muted);font-size:15.5px;margin-bottom:16px;}
.about-idea{margin-top:22px;padding:18px 22px;border-left:4px solid var(--blue-2);background:#eef4fb;border-radius:0 12px 12px 0;color:var(--blue);font-weight:600;font-size:15px;}
.about-facts{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.fact{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow);}
.fact.wide{grid-column:1/-1;}
.fact b{display:block;font-size:24px;color:var(--blue);font-weight:800;}
.fact b em{font-size:14px;font-style:normal;}
.fact span{font-size:12.5px;color:var(--muted);}

/* ===== Contact ===== */
.contact-wrap{display:grid;grid-template-columns:1.3fr .7fr;gap:36px;align-items:center;}
.contact-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:34px;box-shadow:var(--shadow);}
.ci{display:flex;gap:16px;align-items:center;padding:16px 0;border-bottom:1px solid var(--line);}
.ci:last-of-type{border-bottom:none;}
.ci-ic{font-size:22px;width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:#eef4fb;border-radius:12px;flex-shrink:0;}
.ci i{display:block;font-size:12.5px;color:var(--muted);font-style:normal;margin-bottom:2px;}
.ci b,.ci a{font-size:17px;font-weight:700;color:var(--ink);}
.ci a:hover{color:var(--blue);}
.contact-btn{margin-top:22px;width:100%;}
.contact-qr{text-align:center;background:#fff;border:1px solid var(--line);border-radius:20px;padding:24px;box-shadow:var(--shadow);}
.contact-qr img{width:100%;max-width:240px;margin:0 auto;border-radius:12px;}
.contact-qr p{margin-top:14px;font-size:13px;color:var(--muted);}

/* ===== Footer ===== */
.site-footer{background:#0e1e33;color:rgba(255,255,255,.8);}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:40px 22px;flex-wrap:wrap;}
.foot-brand{display:flex;align-items:center;gap:14px;}
.foot-brand img{width:44px;height:42px;object-fit:contain;border-radius:8px;background:rgba(255,255,255,.1);padding:4px;}
.foot-brand b{display:block;color:#fff;font-size:15.5px;}
.foot-brand span{display:block;font-size:12.5px;color:rgba(255,255,255,.6);}
.foot-links{display:flex;gap:22px;flex-wrap:wrap;}
.foot-links a{font-size:13.5px;color:rgba(255,255,255,.72);transition:.2s;}
.foot-links a:hover{color:#fff;}
.foot-bar{border-top:1px solid rgba(255,255,255,.12);}
.foot-bar .container{display:flex;justify-content:space-between;gap:14px;padding:18px 22px;font-size:12px;color:rgba(255,255,255,.55);flex-wrap:wrap;}

/* ===== Float mini button ===== */
.float-mini{position:fixed;right:22px;bottom:26px;z-index:90;background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;font-size:20px;width:60px;height:60px;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 12px 30px rgba(31,78,121,.4);transition:.25s;}
.float-mini span{font-size:9px;font-weight:600;letter-spacing:.5px;}
.float-mini:hover{transform:translateY(-4px) scale(1.05);}

/* ===== Smart plug / 智能注液塞 ===== */
.section-cap{background:linear-gradient(160deg,#eef4fb,#e3eefb 55%,#dbe8f8);}
.cap-wrap{display:grid;grid-template-columns:1fr 1.15fr;gap:48px;align-items:center;}
.cap-visual{background:#fff;border:1px solid var(--line);border-radius:24px;padding:34px;box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;gap:20px;}
.plug-head{display:flex;align-items:center;gap:7px;background:linear-gradient(135deg,var(--blue),var(--blue-2));color:#fff;font-size:12px;font-weight:700;letter-spacing:1px;padding:7px 16px;border-radius:12px 12px 5px 5px;}
.plug-head .led{width:9px;height:9px;border-radius:50%;background:#39d98a;box-shadow:0 0 0 4px rgba(57,217,138,.25);}
.cell-body{position:relative;width:128px;height:180px;border:3px solid var(--blue);border-radius:10px;background:#f6fafe;overflow:hidden;margin-top:-1px;}
.cell-body .acid{position:absolute;left:0;right:0;bottom:0;height:58%;background:linear-gradient(180deg,#bfe0ff,#8fc2f5);opacity:.85;}
.cell-body .beam{position:absolute;left:50%;top:0;bottom:0;width:3px;transform:translateX(-50%);background:repeating-linear-gradient(180deg,var(--accent) 0 7px,transparent 7px 14px);opacity:.9;}
.cap-status{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;}
.cap-status .chip{font-size:12.5px;font-weight:600;padding:7px 14px;border-radius:999px;background:#eef2f7;color:var(--muted);}
.cap-status .chip.ok{background:#e6f7ee;color:#12805a;}
.cap-status .chip.low{background:#fdecec;color:#c0392b;}
.cap-visual-cap{font-size:12px;color:#94a0b0;}
.cap-info h3{font-size:24px;margin-bottom:14px;}
.cap-info>p{color:var(--muted);font-size:15px;margin-bottom:18px;}
.cap-note{font-size:12.5px;color:#94a0b0;margin:16px 0 22px;}

/* ===== Reveal animation ===== */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease;}
.reveal.in{opacity:1;transform:none;}

/* ===== Responsive ===== */
@media (max-width:980px){
  .nav{position:fixed;top:72px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:8px 22px;box-shadow:0 18px 30px rgba(20,45,80,.12);transform:translateY(-12px);opacity:0;pointer-events:none;transition:.25s;border-bottom:1px solid var(--line);}
  .nav.open{transform:none;opacity:1;pointer-events:auto;}
  .nav a{padding:14px 0;border-bottom:1px solid var(--line);}
  .nav a::after{display:none;}
  .nav-cta{display:none;}
  .nav-toggle{display:flex;margin-left:auto;}
  .header-inner{gap:12px;}
  .hero-inner{grid-template-columns:1fr;gap:36px;padding:64px 22px 72px;}
  .hero h1{font-size:36px;}
  .hero-card{max-width:520px;}
  .grid-4{grid-template-columns:1fr 1fr;}
  .product-wrap{grid-template-columns:1fr;gap:32px;}
  .mini-wrap{grid-template-columns:1fr;gap:40px;}
  .about-wrap{grid-template-columns:1fr;gap:34px;}
  .contact-wrap{grid-template-columns:1fr;gap:26px;}
  .timeline{grid-template-columns:1fr 1fr;}
  .lang-switch{margin-left:auto;}
  .cap-wrap{grid-template-columns:1fr;gap:32px;}
  .gallery{grid-template-columns:1fr 1fr;}
}
@media (max-width:600px){
  .section{padding:64px 0;}
  .hero h1{font-size:29px;}
  .hero-stats{grid-template-columns:1fr 1fr;gap:18px 12px;}
  .section-head h2{font-size:25px;}
  .grid-4{grid-template-columns:1fr;}
  .mini-features{grid-template-columns:1fr;}
  .spec-list{grid-template-columns:1fr;}
  .timeline{grid-template-columns:1fr;}
  .about-facts{grid-template-columns:1fr 1fr;}
  .brand-text b{font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:118px;}
  .brand-text{min-width:0;}
  .brand-text i{display:none;}
  .loop-banner{padding:26px;}
  .qr-frame img{width:220px;height:220px;}
  .float-mini{width:54px;height:54px;font-size:18px;}
  .lang-switch{padding:3px;}
  .lang-switch a{padding:5px 7px;font-size:10.5px;}
  .cap-info h3{font-size:21px;}
}