/* ==================== Reset & Base ==================== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  font-size:15px;line-height:1.7;color:#333;background:#fff;
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color .2s}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
ul,ol{list-style:none}
h1,h2,h3,h4{font-weight:600;line-height:1.3;color:#0a2540}

:root{
  --bg:#fff;
  --bg-alt:#f6f8fb;
  --ink:#0a2540;
  --ink-2:#1a3556;
  --text:#333;
  --text-2:#666;
  --text-3:#999;
  --line:#e6ebf1;
  --line-2:#eef2f7;
  --accent:#1890ff;
  --accent-2:#0a2540;
  --shadow:0 8px 30px rgba(10,37,64,.06);
  --shadow-2:0 14px 50px rgba(10,37,64,.10);
  --radius:10px;
  --container:1240px;
}

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

/* ==================== Header ==================== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(255,255,255,.85);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid transparent;
  transition:background .25s,border-color .25s,box-shadow .25s;
}
.site-header.scrolled{background:rgba(255,255,.95);border-color:var(--line);box-shadow:0 2px 18px rgba(10,37,64,.05)}
.header-inner{
  max-width:var(--container);margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;height:68px;
}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand-logo{display:flex;align-items:center;gap:8px;min-width:0}
.brand-main{
  position:relative;font-size:24px;font-weight:800;color:var(--accent-2);
  letter-spacing:1px;white-space:nowrap;
  background:linear-gradient(90deg,#0a2540 0%,#1890ff 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.brand-r{font-size:11px;font-weight:600;color:#ff5a1f;-webkit-text-fill-color:#ff5a1f;margin-left:2px;vertical-align:super;position:relative;top:-6px}
.brand-divider{color:#cfd6df;font-weight:300}
.brand-sub{font-size:14px;color:var(--text-2);white-space:nowrap}

.nav{display:flex;gap:4px;align-items:center}
.nav a{
  position:relative;padding:10px 14px;font-size:15px;color:var(--text);font-weight:500;
  border-radius:6px;transition:color .2s,background .2s;
}
.nav a:hover,.nav a.active{color:var(--accent)}
.nav a.active::after{
  content:"";position:absolute;left:50%;bottom:4px;width:18px;height:2px;background:var(--accent);
  transform:translateX(-50%);border-radius:1px;
}

.header-cta{display:flex;align-items:center;gap:12px}
.phone{
  display:inline-flex;align-items:center;gap:6px;padding:8px 14px;
  background:var(--accent-2);color:#fff;border-radius:999px;font-weight:600;font-size:14px;
  transition:transform .2s,background .2s;
}
.phone:hover{background:var(--accent);transform:translateY(-1px)}

.nav-toggle{display:none;width:40px;height:40px;flex-direction:column;justify-content:center;align-items:center;gap:5px}
.nav-toggle span{width:22px;height:2px;background:var(--ink);border-radius:2px;transition:transform .25s,opacity .25s}

/* ==================== Hero ==================== */
.hero{
  position:relative;height:100vh;min-height:560px;max-height:820px;
  overflow:hidden;color:#fff;
}
.hero-bg{position:absolute;inset:0}
.hero-slide{
  position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:0;transition:opacity 1.2s ease;
}
.hero-slide.active{opacity:1}
.hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(10,37,64,.10) 0%, rgba(10,37,64,.55) 100%);
  pointer-events:none;
}
.hero-inner{
  position:relative;z-index:2;height:100%;
  max-width:var(--container);margin:0 auto;padding:0 24px;
  display:flex;align-items:center;
}
.hero-content{max-width:780px}
.hero-eyebrow{
  display:inline-block;font-size:12px;letter-spacing:4px;color:#9ec5ff;
  border:1px solid rgba(158,197,255,.4);padding:6px 14px;border-radius:999px;
  margin-bottom:22px;backdrop-filter:blur(4px);
}
.hero-title{
  font-size:clamp(40px,7vw,76px);font-weight:800;color:#fff;letter-spacing:2px;
  line-height:1.1;margin-bottom:18px;
}
.hero-r{font-size:.35em;color:#ff8a3d;vertical-align:super;margin-left:6px}
.hero-sub{font-size:clamp(15px,1.6vw,19px);color:rgba(255,255,255,.88);margin-bottom:24px;max-width:680px}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:32px}
.hero-tags span{
  font-size:13px;color:#fff;background:rgba(255,255,255,.12);
  border:1px solid rgba(255,255,255,.25);padding:6px 14px;border-radius:999px;
  backdrop-filter:blur(4px);
}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:13px 28px;font-size:15px;font-weight:600;border-radius:6px;
  transition:all .2s;cursor:pointer;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#40a9ff;transform:translateY(-2px);box-shadow:0 10px 30px rgba(24,144,255,.35)}
.btn-outline{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.6)}
.btn-outline:hover{background:#fff;color:var(--ink);border-color:#fff}

.hero-indicators{position:absolute;right:40px;top:50%;transform:translateY(-50%);z-index:3;display:flex;flex-direction:column;gap:10px}
.hero-indicators button{
  width:30px;height:3px;background:rgba(255,255,255,.4);border-radius:2px;transition:all .3s;
}
.hero-indicators button.active{background:#fff;width:42px}

.hero-scroll{
  position:absolute;left:50%;bottom:30px;transform:translateX(-50%);z-index:3;
  font-size:11px;letter-spacing:4px;color:rgba(255,255,255,.6);
  writing-mode:vertical-rl;
}
.hero-scroll::after{content:"";display:block;width:1px;height:30px;background:rgba(255,255,255,.5);margin:8px auto 0;animation:scrollLine 2s infinite}
@keyframes scrollLine{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ==================== Strip ==================== */
.strip{background:#fff;border-bottom:1px solid var(--line)}
.strip-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.strip-item{
  padding:28px 20px;text-align:center;border-right:1px solid var(--line);
  display:flex;flex-direction:column;gap:4px;
}
.strip-item:last-child{border-right:0}
.strip-item b{font-size:22px;color:var(--ink);font-weight:700;letter-spacing:1px}
.strip-item span{font-size:13px;color:var(--text-2)}

/* ==================== Section ==================== */
.section{padding:96px 0}
.section-alt{background:var(--bg-alt)}
.section-dark{background:var(--ink);color:#cdd6e4}
.section-dark .section-title{color:#fff}
.section-dark .section-desc{color:#9aa8bd}
.section-head{text-align:center;max-width:760px;margin:0 auto 56px}
.section-eyebrow{font-size:12px;letter-spacing:6px;color:var(--accent);font-weight:600;margin-bottom:14px}
.section-title{font-size:clamp(28px,3.4vw,40px);color:var(--ink);margin-bottom:14px;letter-spacing:1px}
.section-title.light{color:#fff}
.section-desc{font-size:15px;color:var(--text-2)}
.section-desc.light{color:#9aa8bd}

/* ==================== About ==================== */
.about-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:60px;align-items:center}
.about-text p{color:var(--text);margin-bottom:16px;font-size:15.5px}
.about-text strong{color:var(--ink);font-weight:600}
.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.tag{
  font-size:13px;color:var(--ink);background:#fff;border:1px solid var(--line);
  padding:6px 14px;border-radius:999px;transition:all .2s;
}
.tag:hover{background:var(--accent);color:#fff;border-color:var(--accent)}
.about-stats{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.stat{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 24px;text-align:center;transition:all .25s;
}
.stat:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:transparent}
.stat b{display:block;font-size:32px;color:var(--accent);font-weight:800;letter-spacing:1px;margin-bottom:4px}
.stat span{font-size:13px;color:var(--text-2)}

/* ==================== Product Tabs ==================== */
.cat-tabs{
  display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:36px;
}
.cat-tab{
  padding:11px 22px;font-size:14px;font-weight:600;color:var(--text);
  background:#fff;border:1px solid var(--line);border-radius:999px;transition:all .2s;
}
.cat-tab:hover{color:var(--accent);border-color:var(--accent)}
.cat-tab.active{background:var(--ink);color:#fff;border-color:var(--ink)}

.cat-intro{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:24px 28px;margin-bottom:28px;
}
.cat-intro h3{font-size:22px;color:var(--ink);margin-bottom:8px}
.cat-intro p{color:var(--text-2);font-size:15px}

/* ==================== Grid ==================== */
.grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
}
.grid-cases{grid-template-columns:repeat(4,1fr)}
.card{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:all .25s;cursor:pointer;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:transparent}
.card-img{
  position:relative;width:100%;aspect-ratio:4/3;overflow:hidden;background:#eef2f7;
}
.card-img img{
  width:100%;height:100%;object-fit:cover;transition:transform .5s ease;
}
.card:hover .card-img img{transform:scale(1.06)}
.card-img::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,transparent 60%,rgba(10,37,64,.45) 100%);
  opacity:0;transition:opacity .25s;
}
.card:hover .card-img::after{opacity:1}
.card-zoom{
  position:absolute;right:10px;bottom:10px;z-index:2;width:32px;height:32px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(255,255,255,.9);color:var(--ink);border-radius:50%;font-size:14px;
  opacity:0;transform:translateY(6px);transition:all .25s;
}
.card:hover .card-zoom{opacity:1;transform:translateY(0)}
.card-body{padding:14px 16px}
.card-title{font-size:14.5px;font-weight:600;color:var(--ink);margin-bottom:4px;line-height:1.4}
.card-desc{font-size:12.5px;color:var(--text-2);line-height:1.55;
  display:-webkit-box;-webkit-line-clamp:2;line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}

.case-card .card-body{padding:12px 14px}
.case-card .card-meta{font-size:12px;color:var(--accent);font-weight:600;margin-bottom:4px}
.case-card .card-title{font-size:14px}

/* ==================== Applications ==================== */
.app-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:20px;
}
.app-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:32px 26px;transition:all .25s;
}
.app-card:hover{border-color:transparent;box-shadow:var(--shadow-2);transform:translateY(-4px)}
.app-icon{
  width:48px;height:48px;border-radius:8px;
  background:linear-gradient(135deg,#e6f1ff,#f6f8fb);
  color:var(--accent);font-weight:800;font-size:16px;
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;letter-spacing:1px;
}
.app-card h3{font-size:17px;color:var(--ink);margin-bottom:8px}
.app-card p{font-size:13.5px;color:var(--text-2);line-height:1.7}

/* ==================== FAQ ==================== */
.faq-list{max-width:980px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;transition:all .2s;
}
.faq-item.open{border-color:var(--accent);box-shadow:0 4px 18px rgba(24,144,255,.08)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:18px 22px;text-align:left;font-size:15.5px;font-weight:600;color:var(--ink);
}
.faq-q:hover{color:var(--accent)}
.faq-icon{
  flex:0 0 28px;width:28px;height:28px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:#f0f4f9;color:var(--ink);font-size:18px;font-weight:400;line-height:1;
  transition:all .25s;
}
.faq-item.open .faq-icon{background:var(--accent);color:#fff;transform:rotate(45deg)}
.faq-a{
  max-height:0;overflow:hidden;transition:max-height .35s ease;
  color:var(--text);font-size:14.5px;line-height:1.85;
}
.faq-a-inner{padding:0 22px 20px;border-top:1px dashed var(--line);padding-top:16px;margin-top:0}
.faq-item.open .faq-a{max-height:600px}

/* ==================== Contact ==================== */
.contact-grid{
  display:grid;grid-template-columns:1.4fr 1fr;gap:50px;align-items:stretch;
}
.contact-card{
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);
  border-radius:var(--radius);padding:38px 36px;
}
.contact-card h3{font-size:13px;color:#9ec5ff;letter-spacing:2px;margin-top:20px;margin-bottom:6px;font-weight:600}
.contact-card h3:first-child{margin-top:0}
.contact-card p{color:#e6edf7;font-size:15.5px;line-height:1.8}
.contact-card .link{color:#9ec5ff}
.contact-card .link:hover{color:#fff}
.contact-qr{
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);
  border-radius:var(--radius);padding:34px 28px;text-align:center;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
}
.qr-wrap img{
  width:200px;height:200px;background:#fff;border-radius:8px;padding:10px;
}
.qr-wrap p{color:#fff;font-size:14px;font-weight:600;margin-top:10px}
.qr-tip{color:#9aa8bd;font-size:13px}

/* ==================== Footer ==================== */
.site-footer{
  background:#061a30;color:#9aa8bd;padding:30px 0;
  font-size:13px;line-height:1.9;
}
.footer-inner{text-align:center}
.footer-inner a{color:#cfd8e3}
.footer-inner a:hover{color:#fff}
.footer-key{color:#6c7a8c;font-size:12.5px;margin-top:8px;letter-spacing:.5px}
.footer-city{margin-bottom:20px;padding-bottom:18px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-city h4{color:#fff;font-size:14px;font-weight:600;margin-bottom:10px;letter-spacing:1px}
.footer-city-links{display:flex;flex-wrap:wrap;gap:6px 14px;justify-content:center}
.footer-city-links a{color:#9ec5ff;font-size:12.5px;padding:3px 8px;border:1px solid rgba(255,255,255,.08);border-radius:4px;transition:.2s}
.footer-city-links a:hover{color:#fff;background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.2)}

/* ==================== Lightbox ==================== */
.lightbox{
  position:fixed;inset:0;z-index:200;background:rgba(0,0,0,.92);
  display:none;align-items:center;justify-content:center;padding:60px 20px;
}
.lightbox.show{display:flex}
.lb-close,.lb-prev,.lb-next{
  position:absolute;color:#fff;font-size:36px;line-height:1;
  width:50px;height:50px;display:flex;align-items:center;justify-content:center;
  border-radius:50%;background:rgba(255,255,255,.1);transition:background .2s;
}
.lb-close{top:24px;right:24px;font-size:30px}
.lb-prev{left:24px;top:50%;transform:translateY(-50%)}
.lb-next{right:24px;top:50%;transform:translateY(-50%)}
.lb-close:hover,.lb-prev:hover,.lb-next:hover{background:rgba(255,255,255,.25)}
.lb-stage{text-align:center;max-width:90vw;max-height:80vh}
.lb-stage img{max-width:100%;max-height:75vh;object-fit:contain;background:#0a2540}
.lb-stage p{color:#cdd6e4;font-size:14px;margin-top:14px;max-width:760px}

/* ==================== Floats ==================== */
.floats{
  position:fixed;right:20px;bottom:24px;z-index:90;
  display:flex;flex-direction:column;gap:10px;
}
.float{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  width:54px;height:54px;background:#fff;color:var(--ink);
  border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);
  font-size:11px;font-weight:600;transition:all .2s;
}
.float:hover{background:var(--accent);color:#fff;border-color:var(--accent);transform:translateY(-2px)}

/* ==================== Responsive ==================== */
@media (max-width:1024px){
  .grid,.grid-cases,.app-grid{grid-template-columns:repeat(3,1fr)}
  .about-grid{grid-template-columns:1fr;gap:36px}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:768px){
  .nav{
    position:fixed;top:68px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;align-items:stretch;padding:10px 16px 18px;gap:2px;
    transform:translateY(-12px);opacity:0;pointer-events:none;transition:all .25s;
  }
  .nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
  .nav a{padding:12px 14px;border-bottom:1px solid var(--line-2)}
  .nav a:last-child{border-bottom:0}
  .header-cta .phone{padding:6px 10px;font-size:13px}
  .nav-toggle{display:flex}
  .strip-grid{grid-template-columns:repeat(2,1fr)}
  .strip-item:nth-child(2){border-right:0}
  .section{padding:64px 0}
  .grid,.grid-cases,.app-grid{grid-template-columns:repeat(2,1fr)}
  .hero-indicators{right:14px}
  .hero-scroll{display:none}
  .brand-sub{display:none}
}
@media (max-width:480px){
  .grid,.grid-cases,.app-grid{grid-template-columns:1fr 1fr;gap:12px}
  .about-stats{grid-template-columns:1fr 1fr;gap:12px}
  .stat{padding:20px 14px}
  .stat b{font-size:24px}
  .floats{right:10px;bottom:14px}
  .float{width:48px;height:48px;font-size:10px}
  .card-body{padding:10px 12px}
  .card-title{font-size:13px}
  .card-desc{font-size:11.5px}
  .contact-card{padding:24px 20px}
}