/* ===== hltjc1 · 科技蓝 (Tech Blue) ===== */
:root{
  --primary:#0A3D91;
  --primary-2:#0E5BD6;
  --steel:#2E9BE6;
  --steel-3:#7CC4F2;
  --accent:#15D6C9;
  --accent-2:#0FB5AA;
  --bg:#F2F6FC;
  --surface:#ffffff;
  --surface-2:#EAF2FB;
  --text:#16202E;
  --muted:#54657D;
  --line:#DCE6F2;
  --radius:16px;
  --radius-sm:12px;
  --shadow-sm:0 1px 2px rgba(10,61,145,.06),0 6px 18px rgba(10,61,145,.07);
  --shadow-md:0 14px 38px rgba(10,61,145,.16);
  --shadow-lg:0 24px 64px rgba(10,61,145,.22);
  --maxw:1200px;
  --font:'PingFang SC','Noto Sans SC','Microsoft YaHei',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--text);background:var(--bg);line-height:1.7;font-size:16px;-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 24px}

/* ===== Header ===== */
.header{position:sticky;top:0;z-index:80;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(14px);border-bottom:2px solid var(--accent)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;font-size:17px;color:var(--primary)}
.brand .logo{width:42px;height:42px;border-radius:11px;background:linear-gradient(135deg,var(--primary),var(--steel));display:grid;place-items:center;color:#fff;font-size:21px;font-weight:800;box-shadow:0 6px 16px rgba(46,155,230,.35);letter-spacing:0}
.brand small{display:block;font-size:11px;color:var(--muted);font-weight:500;letter-spacing:1px;margin-top:1px}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a{font-size:15px;color:var(--text);font-weight:500;position:relative;padding:6px 0;transition:color .2s}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;height:2px;width:0;background:var(--accent);transition:width .25s}
.nav-links a:hover,.nav-links a.active{color:var(--primary)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{background:linear-gradient(135deg,var(--primary),var(--steel));color:#fff !important;padding:10px 20px !important;border-radius:999px;font-weight:700;box-shadow:0 6px 16px rgba(46,155,230,.35)}
.nav-cta:hover{filter:brightness(1.07)}
.nav-toggle{display:none;background:none;border:none;font-size:26px;color:var(--primary);cursor:pointer}

/* ===== Carousel (homepage hero) ===== */
.carousel{position:relative;height:min(78vh,640px);min-height:480px;overflow:hidden;background:#06203f}
.carousel .track{position:absolute;inset:0}
.carousel .slide{position:absolute;inset:0;opacity:0;transition:opacity .9s ease;background-size:cover;background-position:center}
.carousel .slide::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,32,63,.40) 0%,rgba(6,32,63,.80) 100%)}
.carousel .slide.active{opacity:1}
.carousel .slide-content{position:relative;z-index:2;height:100%;display:flex;align-items:flex-end;padding:0 0 86px;color:#fff}
.carousel .slide-inner{max-width:var(--maxw);margin:0 auto;width:100%;padding:0 24px}
.carousel .eyebrow{display:inline-block;background:var(--accent);color:#06203f;padding:6px 16px;border-radius:999px;font-size:12px;font-weight:700;letter-spacing:2px;margin-bottom:18px}
.carousel h1{font-size:clamp(28px,4.6vw,52px);line-height:1.18;font-weight:800;max-width:780px;letter-spacing:1px;text-shadow:0 2px 20px rgba(0,0,0,.3)}
.carousel p{max-width:620px;margin-top:14px;font-size:16px;color:#dfeaff;line-height:1.7}
.carousel .dots{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:3}
.carousel .dot{width:32px;height:4px;background:rgba(255,255,255,.35);border-radius:2px;cursor:pointer;transition:.3s}
.carousel .dot.active{background:var(--accent);width:48px}
.carousel .arrow{position:absolute;top:50%;transform:translateY(-50%);width:48px;height:48px;border-radius:50%;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);color:#fff;display:grid;place-items:center;cursor:pointer;z-index:3;font-size:20px;transition:.2s}
.carousel .arrow:hover{background:rgba(46,155,230,.5)}
.carousel .arrow.prev{left:24px}
.carousel .arrow.next{right:24px}

/* ===== Single banner (sub pages) ===== */
.banner{position:relative;height:360px;overflow:hidden;background:#06203f;color:#fff}
.banner::after{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(6,32,63,.80) 0%,rgba(10,61,145,.55) 60%,rgba(46,155,230,.25) 100%)}
.banner .bg{position:absolute;inset:0;background-size:cover;background-position:center}
.banner .inner{position:relative;z-index:2;height:100%;display:flex;flex-direction:column;justify-content:center}
.banner .eyebrow{display:inline-block;background:var(--accent);color:#06203f;padding:5px 14px;border-radius:999px;font-size:12px;font-weight:700;letter-spacing:2px;margin-bottom:14px;width:fit-content}
.banner h1{font-size:clamp(28px,4vw,44px);font-weight:800;letter-spacing:1px}
.banner .crumb{margin-top:10px;font-size:13px;color:#cfe0f5}
.banner .crumb b{color:var(--accent)}

/* ===== Section ===== */
.section{padding:74px 0}
.section-head{text-align:center;max-width:740px;margin:0 auto 44px}
.section-head .eyebrow{color:var(--steel);font-weight:700;letter-spacing:3px;font-size:12px}
.section-head h2{font-size:clamp(24px,2.8vw,34px);margin:10px 0 12px;color:var(--primary)}
.section-head p{color:var(--muted)}
.bg-soft{background:var(--surface-2)}

/* ===== Stats ===== */
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.stat{background:var(--surface);border-radius:var(--radius);padding:26px 18px;text-align:center;box-shadow:var(--shadow-sm);border:1px solid var(--line)}
.stat .num{font-size:32px;font-weight:800;color:var(--primary);line-height:1}
.stat .num span{color:var(--accent)}
.stat .label{margin-top:8px;color:var(--muted);font-size:13px}

/* ===== Cards ===== */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--steel);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm);transition:.25s}
.card:hover{transform:translateY(-3px);box-shadow:0 14px 36px rgba(46,155,230,.22);border-color:var(--steel-3)}
.card .ico{width:50px;height:50px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--steel));display:grid;place-items:center;color:#fff;font-size:22px;margin-bottom:14px}
.card h3{font-size:18px;margin-bottom:8px;color:var(--primary)}
.card p{color:var(--muted);font-size:14.5px}

/* ===== Image card ===== */
.img-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);transition:.25s;display:flex;flex-direction:column}
.img-card:hover{transform:translateY(-4px);box-shadow:0 16px 42px rgba(46,155,230,.26);border-color:var(--steel-3)}
.img-card .ph{height:190px;overflow:hidden;position:relative}
.img-card img{width:100%;height:190px;object-fit:cover;transition:.45s}
.img-card:hover img{transform:scale(1.07)}
.img-card .cap{padding:22px;flex:1;display:flex;flex-direction:column}
.img-card h3{font-size:18px;margin-bottom:8px;color:var(--primary)}
.img-card p{color:var(--muted);font-size:14px;line-height:1.7}
.img-card .tag{display:inline-block;background:var(--accent);color:#06203f;padding:3px 11px;border-radius:999px;font-size:11px;font-weight:700;margin-bottom:10px;letter-spacing:1px;align-self:flex-start}
.img-card .more{display:inline-flex;align-items:center;gap:6px;margin-top:auto;color:var(--steel);font-weight:700;font-size:13px}
.clamp-2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.clamp-3{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.grid.equal{grid-auto-rows:1fr}

/* ===== Tabs ===== */
.tabs{display:flex;gap:0;justify-content:center;flex-wrap:wrap;margin-bottom:38px;background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:6px;width:fit-content;margin-left:auto;margin-right:auto;box-shadow:var(--shadow-sm)}
.tab{padding:10px 26px;border-radius:999px;border:none;background:transparent;color:var(--muted);font-weight:600;cursor:pointer;transition:.2s;font-size:15px}
.tab:hover{color:var(--primary)}
.tab.active{background:linear-gradient(135deg,var(--primary),var(--steel));color:#fff;box-shadow:0 6px 18px rgba(46,155,230,.4)}
.panel{display:none;animation:fade .45s ease}
.panel.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

.split{display:grid;grid-template-columns:1fr 1fr;gap:46px;align-items:center}
.split.flip{direction:rtl}
.split.flip > *{direction:ltr}
.split img{border-radius:var(--radius);box-shadow:var(--shadow-md);width:100%;height:380px;object-fit:cover}
.split h3{font-size:24px;color:var(--primary);margin-bottom:14px}
.split h3 small{display:block;color:var(--accent);font-size:13px;letter-spacing:3px;font-weight:700;margin-bottom:8px}
.split p{color:#3a4655;margin-bottom:12px}
.split ul{color:var(--muted);padding-left:18px;margin-top:10px}
.split ul li{margin:6px 0}

/* ===== Project list ===== */
.proj-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.proj{position:relative;display:flex;gap:18px;padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);transition:.25s}
.proj:hover{box-shadow:0 14px 34px rgba(46,155,230,.2);border-color:var(--steel-3);transform:translateY(-2px)}
.proj .num{flex:0 0 auto;width:50px;height:50px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--steel));color:#fff;display:grid;place-items:center;font-weight:800;font-size:18px}
.proj h4{font-size:16px;color:var(--primary);margin-bottom:4px}
.proj p{color:var(--muted);font-size:13.5px}
.proj .tag{display:inline-block;background:var(--surface-2);color:var(--steel);padding:3px 10px;border-radius:999px;font-size:11px;font-weight:700;margin-bottom:6px;letter-spacing:1px}

/* ===== News list ===== */
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;align-items:stretch;grid-auto-rows:1fr}
.news-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);transition:.25s;display:flex;flex-direction:column;height:100%}
.news-card:hover{box-shadow:0 16px 40px rgba(46,155,230,.22);transform:translateY(-3px)}
.news-card img{width:100%;height:200px;object-fit:cover}
.news-card .body{padding:22px;flex:1;display:flex;flex-direction:column}
.news-date{display:flex;align-items:baseline;gap:8px;color:var(--steel);font-size:13px;font-weight:600;margin-bottom:10px}
.news-date .d{background:var(--primary);color:#fff;padding:3px 10px;border-radius:6px;font-size:12px}
.news-card h3{font-size:18px;color:var(--primary);margin-bottom:10px;line-height:1.4}
.news-card p{color:var(--muted);font-size:14px;line-height:1.7;flex:1}
.news-card .more{display:inline-flex;align-items:center;gap:6px;margin-top:14px;color:var(--steel);font-weight:700;font-size:13px}

/* ===== Contact ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.contact-info .row{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}
.contact-info .row .ico{color:var(--accent);font-size:22px;width:32px;flex:0 0 32px;text-align:center}
.contact-info h3{color:var(--primary);font-size:22px;margin-bottom:18px}
.form input,.form textarea{width:100%;padding:13px 15px;border:1px solid var(--line);border-radius:var(--radius-sm);font-family:inherit;font-size:15px;margin-bottom:14px;background:var(--surface)}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--steel);box-shadow:0 0 0 3px rgba(46,155,230,.15)}
.map{height:300px;border-radius:var(--radius);background:linear-gradient(135deg,#dce8f7,#c3d8f0);display:grid;place-items:center;color:var(--muted);border:1px solid var(--line)}

/* ===== Footer ===== */
.footer{background:var(--primary);color:#cfe0f5;padding:50px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.footer h4{color:#fff;font-size:16px;margin-bottom:16px}
.footer a{color:#a9c4e6;display:block;padding:5px 0;font-size:14px;transition:.2s}
.footer a:hover{color:var(--accent)}
.footer .copy{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:18px;font-size:13px;color:#8fa9cc;text-align:center}

/* ===== Reveal ===== */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .55s ease,transform .55s ease}
.reveal.in{opacity:1;transform:none}

/* ===== Back to top ===== */
.to-top{position:fixed;right:26px;bottom:26px;z-index:60;width:48px;height:48px;border-radius:50%;background:var(--primary);color:#fff;border:none;cursor:pointer;display:grid;place-items:center;font-size:20px;box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transform:translateY(14px);transition:opacity .3s,transform .3s,visibility .3s,background .2s}
.to-top:hover{background:var(--steel);transform:translateY(0) scale(1.06);box-shadow:0 10px 26px rgba(46,155,230,.4)}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
@media(max-width:560px){.to-top{right:16px;bottom:16px;width:44px;height:44px}}

/* ===== Responsive ===== */
@media(max-width:960px){
  .nav-links{position:fixed;inset:74px 0 0 0;background:#fff;flex-direction:column;padding:24px;gap:18px;transform:translateX(100%);transition:.3s;box-shadow:var(--shadow-md);z-index:75;overflow-y:auto}
  .nav-links.open{transform:none;height: 100vh;}
  .nav-toggle{display:block}
  .grid-2,.grid-3,.grid-4,.stats,.footer-grid,.split,.proj-list,.news-grid,.contact-grid{grid-template-columns:1fr !important}
  .split.flip{direction:ltr}
  .split img{height:260px}
  .carousel .arrow{display:none}
  .banner{height:300px}
  /* 菜单打开时锁定背景滚动，并隐藏第三方浮窗（AI客服/翻译条），避免浮在菜单之上 */
  body.nav-open{overflow:hidden}
  body.nav-open [id*="chat"],body.nav-open [class*="chat"],
  body.nav-open [id*="dometa"],body.nav-open [class*="dometa"],
  body.nav-open [id*="translate-widget"],body.nav-open [class*="translate-widget"]{display:none !important}
}
@media(max-width:560px){
  .stat .num{font-size:26px}
  .section{padding:54px 0}
  .tabs{padding:4px}
  .tab{padding:9px 16px;font-size:13px}
}