:root{
  --blue:#0a3d7a; --blue-d:#06294f; --blue-l:#e8f1fb;
  --ink:#0e1622; --sub:#56616f; --muted:#8a93a2;
  --bg:#f1f5fa; --card:#ffffff; --line:#e6eaf1;
  --green:#1c9d5b; --amber:#c8821a; --red:#d93025; --accent:#ff7a1a;
  --radius:14px; --shadow:0 6px 20px rgba(14,22,34,.07);
  --maxw:1140px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;font-size:15px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.section{padding:72px 0}
.section.sm{padding:48px 0}
.center{text-align:center}
.muted{color:var(--muted)}

/* ---------- Top bar ---------- */
.topbar{background:var(--ink);color:#cfd6e2;font-size:13px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:38px}
.topbar a:hover{color:#fff}

/* ---------- Nav ---------- */
.nav{background:var(--card);position:sticky;top:0;z-index:50;border-bottom:1px solid var(--line);box-shadow:0 1px 6px rgba(0,0,0,.03)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--ink)}
.logo .mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,var(--blue),#3f7fd6);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px}
.logo .slogan{font-size:12px;font-weight:500;color:var(--blue);margin-left:4px;padding-left:10px;border-left:1px solid var(--line);white-space:nowrap}
.menu{display:flex;gap:28px;align-items:center}
.menu a{font-size:15px;color:var(--sub);font-weight:500;transition:.2s}
.menu a:hover,.menu a.active{color:var(--blue)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--blue);color:#fff;padding:10px 20px;border-radius:10px;font-weight:600;font-size:14px;
  border:none;cursor:pointer;transition:.2s}
.btn:hover{background:var(--blue-d);transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--blue);border:1px solid var(--blue)}
.btn.ghost:hover{background:var(--blue-l)}
.btn.lg{padding:13px 28px;font-size:16px}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.hamburger span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}

/* ---------- Hero ---------- */
.hero{background:linear-gradient(135deg,#082a55 0%,#0d4a8c 55%,#0a3d7a 100%);position:relative;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;padding:80px 20px}
.hero h1{font-size:42px;line-height:1.25;margin-bottom:18px;letter-spacing:-.5px}
.hero h1 .hl{color:var(--blue)}
.hero .slogan-hero{font-size:18px;color:var(--blue);font-weight:600;margin-bottom:16px;letter-spacing:2px}
.hero p.lead{font-size:17px;color:var(--sub);margin-bottom:28px;max-width:520px}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-art{border-radius:18px;background:var(--card);position:relative;box-shadow:0 18px 50px rgba(0,55,130,.18);overflow:hidden;border:1px solid #cfe0ff}
.hero-art img{width:100%;height:auto;display:block}
.hero-art .badge{position:absolute;top:18px;left:18px;background:var(--accent);color:#fff;
  font-weight:700;font-size:13px;padding:6px 14px;border-radius:999px;box-shadow:0 4px 12px rgba(0,0,0,.2)}
.stats{display:flex;gap:32px;margin-top:34px;flex-wrap:wrap;align-items:center}
.stats>div{position:relative;padding-right:32px}
.stats>div:not(:last-child)::after{content:"";position:absolute;right:0;top:10%;bottom:10%;width:1px;background:var(--line)}
.stats .n{font-size:28px;font-weight:800;color:var(--ink)}
.stats .l{font-size:13px;color:var(--muted)}

/* ---------- Section heading ---------- */
.sec-head{text-align:center;max-width:640px;margin:0 auto 44px}
.sec-head .kicker{color:var(--blue);font-weight:700;font-size:14px;letter-spacing:1px}
.sec-head h2{font-size:30px;margin:10px 0 12px}
.sec-head p{color:var(--sub)}

/* ---------- Grid cards ---------- */
.grid{display:grid;gap:22px}
.grid.c3{grid-template-columns:repeat(3,1fr);align-items:stretch}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:.2s}
.card:hover{transform:translateY(-3px);border-color:#cfe0ff}
.card .ico{width:48px;height:48px;border-radius:12px;background:var(--blue-l);color:var(--blue);
  display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}
.card h3{font-size:18px;margin-bottom:8px}
.card p{color:var(--sub);font-size:14px}
.card .more{display:inline-block;margin-top:14px;color:var(--blue);font-weight:600;font-size:14px}

/* product card */
.pcard{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--card);box-shadow:var(--shadow);transition:.2s}
.pcard:hover{transform:translateY(-3px)}
.pcard .thumb{aspect-ratio:16/9;background:linear-gradient(135deg,#dbe7ff,#eef3ff);background-size:cover;background-position:center;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:700;text-shadow:0 2px 4px rgba(0,0,0,.4)}
.pcard .body{padding:20px}
.pcard .spec{margin-top:10px;padding-top:10px;border-top:1px dashed var(--line);font-size:12px;color:var(--sub);display:flex;gap:6px 14px;flex-wrap:wrap}
.pcard .spec b{color:var(--accent);font-weight:700}
.pcard h3{font-size:17px;margin-bottom:6px}
.pcard p{color:var(--sub);font-size:14px}
.tagrow{margin-top:12px;display:flex;gap:8px;flex-wrap:wrap}
.tag{font-size:12px;background:var(--blue-l);color:var(--blue-d);padding:4px 10px;border-radius:999px}

/* case card */
.ccard{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--card);box-shadow:var(--shadow);transition:.2s}
.ccard:hover{transform:translateY(-3px)}
.ccard .cover{position:relative;background:#0f1620;line-height:0;aspect-ratio:4/3;overflow:hidden}
.ccard .cover img{display:block;width:100%;height:100%;object-fit:cover;object-position:center}
.ccard .cover span{position:absolute;left:16px;bottom:14px;color:#fff;font-weight:700;font-size:15px;text-shadow:0 2px 4px rgba(0,0,0,.4)}
.ccard .body{padding:18px}
.ccard .body .meta{font-size:13px;color:var(--muted);margin-bottom:6px}
.ccard .body p{color:var(--sub);font-size:14px}
.ccard .kpi{margin-top:12px;display:flex;gap:18px}
.ccard .kpi b{color:var(--green);font-size:18px;display:block}
.ccard .kpi span{font-size:12px;color:var(--muted)}

/* timeline */
.timeline{position:relative;margin:0 auto;max-width:760px;padding-left:24px}
.timeline::before{content:"";position:absolute;left:7px;top:6px;bottom:6px;width:2px;background:var(--line)}
.tl-item{position:relative;padding:0 0 28px 28px}
.tl-item::before{content:"";position:absolute;left:-21px;top:4px;width:16px;height:16px;border-radius:50%;
  background:var(--blue);border:3px solid #fff;box-shadow:0 0 0 2px var(--blue-l)}
.tl-item .y{font-weight:800;color:var(--blue-d)}
.tl-item h4{font-size:16px;margin:2px 0 4px}
.tl-item p{color:var(--sub);font-size:14px}

/* values */
.value{display:flex;gap:14px;align-items:flex-start}
.value .vico{flex:0 0 42px;height:42px;border-radius:11px;background:var(--blue-l);color:var(--blue);
  display:flex;align-items:center;justify-content:center;font-size:20px}

/* CTA band */
.cta{background:linear-gradient(135deg,var(--blue) 0%,var(--accent) 100%);color:#fff;border-radius:18px;padding:48px;text-align:center}
.cta h2{font-size:28px;margin-bottom:10px}
.cta p{opacity:.92;margin-bottom:24px}

/* contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}
.info-item{display:flex;gap:14px;margin-bottom:22px}
.info-item .iico{flex:0 0 44px;height:44px;border-radius:11px;background:var(--blue-l);color:var(--blue);
  display:flex;align-items:center;justify-content:center;font-size:20px}
.info-item h4{font-size:15px;margin-bottom:2px}
.info-item p{color:var(--sub);font-size:14px}
.map-ph{aspect-ratio:16/9;border-radius:14px;background:
  repeating-linear-gradient(45deg,#e9eef7 0 14px,#f3f6fc 14px 28px);
  display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px;border:1px solid var(--line)}
.form{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.form label{display:block;font-size:14px;font-weight:600;margin:14px 0 6px}
.form label:first-child{margin-top:0}
.form input,.form textarea{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:10px;font-size:14px;
  font-family:inherit;background:#fbfcfe;transition:.2s}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--blue);background:#fff}
.form textarea{resize:vertical;min-height:110px}
.form .err{border-color:var(--red)!important}
.form .msg{font-size:13px;margin-top:10px;min-height:18px}
.form .msg.ok{color:var(--green)}
.form .msg.bad{color:var(--red)}

/* wechat QR */
.wechat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;text-align:center;box-shadow:var(--shadow);margin-top:18px}
.wechat-card img.qr{width:170px;height:auto;margin:0 auto 8px;border-radius:10px;border:1px solid var(--line)}
.wechat-card h4{font-size:15px;margin-bottom:4px}
.wechat-card p{color:var(--muted);font-size:13px;margin-bottom:12px}
.wechat-row{display:flex;gap:16px;justify-content:center;align-items:flex-start;flex-wrap:wrap}
.wechat-row .qr-sm{width:100px}

/* footer */
.footer{background:var(--ink);color:#aeb6c4;padding:54px 0 26px;font-size:14px}
.footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.footer h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer a{display:block;color:#aeb6c4;margin-bottom:9px;font-size:14px}
.footer a:hover{color:#fff}
.footer .brand{font-size:18px;font-weight:800;color:#fff;margin-bottom:4px}
.footer .brand .brand-tagline{display:block;font-size:12px;font-weight:400;color:#6b7b92;margin-top:4px;letter-spacing:1px}
.footer .desc{font-size:13px;line-height:1.8}
.footer .bottom{border-top:1px solid #2c3138;margin-top:36px;padding-top:18px;display:flex;
  justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#7b8494}

/* breadcrumb */
.crumb{font-size:13px;color:var(--muted);padding:18px 0}
.crumb a:hover{color:var(--blue)}

/* page hero banner (generated visual) */
.page-hero{position:relative;padding:96px 0;background-size:cover;background-position:center;color:#fff;overflow:hidden}
.page-hero::before{content:"";position:absolute;inset:0;background:linear-gradient(120deg,rgba(8,42,85,.9),rgba(10,61,122,.55) 55%,rgba(10,61,122,.12))}
.page-hero .wrap{position:relative;z-index:1}
.page-hero .kicker{color:#bfe0ff;font-weight:700;font-size:14px;letter-spacing:1px;margin-bottom:10px}
.page-hero h1{font-size:38px;line-height:1.25;margin-bottom:14px;text-shadow:0 2px 10px rgba(0,0,0,.35)}
.page-hero .slogan-hero{font-size:18px;font-weight:600;letter-spacing:2px;margin-bottom:14px;color:#bfe0ff;text-shadow:0 1px 5px rgba(0,0,0,.35)}
.page-hero p{font-size:17px;opacity:.96;max-width:600px;text-shadow:0 1px 5px rgba(0,0,0,.35)}
@media(max-width:640px){.page-hero{padding:64px 0}.page-hero h1{font-size:27px}}

/* placeholder note */
.ph-note{display:inline-block;background:#fff7ec;color:var(--amber);font-size:12px;
  border:1px solid #f3d9a6;border-radius:6px;padding:2px 8px;margin-left:8px;vertical-align:middle}

/* ---------- Scroll progress bar ---------- */
.scroll-progress{position:fixed;top:0;left:0;height:3px;width:0%;
  background:linear-gradient(90deg,var(--blue),#5b8def);z-index:100;transition:width .1s ease-out}

/* ---------- Nav scroll shrink ---------- */
.nav{background:var(--card);position:sticky;top:0;z-index:50;border-bottom:1px solid var(--line);
  box-shadow:0 1px 6px rgba(0,0,0,.03);transition:box-shadow .3s,padding .3s}
.nav.scrolled{box-shadow:0 2px 12px rgba(10,61,122,.12)}
.nav.scrolled .wrap{height:56px}
.nav .wrap{transition:height .3s}

/* ---------- Scroll reveal animation ---------- */
.reveal{opacity:0;transform:translateY(32px);transition:opacity .7s cubic-bezier(.22,1,.36,1),transform .7s cubic-bezier(.22,1,.36,1)}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal.delay-1{transition-delay:.1s}
.reveal.delay-2{transition-delay:.2s}
.reveal.delay-3{transition-delay:.3s}

/* ---------- Stats counter ---------- */
.stats .n{font-size:40px;font-weight:900;color:var(--accent);line-height:1.1;letter-spacing:-1px}
.stats .l{font-size:13px;color:var(--muted);margin-top:2px;font-weight:500}

/* ---------- Back to top ---------- */
.back-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;border-radius:12px;
  background:var(--blue);color:#fff;border:none;cursor:pointer;font-size:20px;
  display:flex;align-items:center;justify-content:center;z-index:90;
  opacity:0;transform:translateY(16px);pointer-events:none;
  transition:opacity .3s,transform .3s,background .2s;
  box-shadow:0 6px 20px rgba(0,71,160,.3)}
.back-top.show{opacity:1;transform:translateY(0);pointer-events:auto}
.back-top:hover{background:var(--blue-d);transform:translateY(-2px)}

/* ---------- Card image zoom ---------- */
.pcard .thumb,.ccard .cover{overflow:hidden;transition:none}
.pcard:hover .thumb{transform:scale(1.05)}
.ccard:hover .cover{transform:scale(1.05)}
.pcard .thumb,.ccard .cover{transition:transform .5s cubic-bezier(.22,1,.36,1)}

/* ---------- Button glow ---------- */
.btn{position:relative;overflow:hidden}
.btn::after{content:"";position:absolute;inset:0;background:rgba(255,255,255,.2);
  opacity:0;transition:opacity .3s}
.btn:hover::after{opacity:1}
.btn:active{transform:translateY(0) scale(.98)}

/* ---------- Enhanced form ---------- */
.form input,.form textarea{transition:border-color .2s,box-shadow .2s,background .2s}
.form input:focus,.form textarea:focus{outline:none;border-color:var(--blue);background:#fff;
  box-shadow:0 0 0 3px rgba(0,71,160,.1)}
.form input.err,.form textarea.err{border-color:var(--red)!important;box-shadow:0 0 0 3px rgba(217,48,37,.1)}
.form .field-wrap{position:relative}
.form .field-wrap .err-hint{font-size:12px;color:var(--red);margin-top:4px;display:none}
.form .field-wrap.has-error .err-hint{display:block}

/* ---------- Custom scrollbar ---------- */
::-webkit-scrollbar{width:10px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:#c5cdd9;border-radius:5px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:var(--muted)}

/* ---------- Accessibility ---------- */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible{
  outline:2px solid var(--blue);outline-offset:2px}

/* ---------- Reduced motion ---------- */
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  .reveal{opacity:1!important;transform:none!important}
  .scroll-progress{transition:none!important}
}
@media(max-width:900px){
  .hero .wrap{grid-template-columns:1fr;padding:54px 20px}
  .hero h1{font-size:32px}
  .hero-art{order:-1}
  .grid.c3,.grid.c4{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .footer .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .menu{position:fixed;top:102px;left:0;right:0;background:var(--card);flex-direction:column;
    gap:0;padding:10px 20px 20px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);
    transform:translateY(-150%);transition:.3s;z-index:40}
  .menu.open{transform:translateY(0)}
  .menu a{padding:12px 0;width:100%;border-bottom:1px solid var(--line)}
  .menu .btn{margin-top:12px}
  .hamburger{display:flex}
  .grid.c3,.grid.c4,.grid.c2{grid-template-columns:1fr}
  .stats{gap:22px}
  .section{padding:52px 0}
  .sec-head h2{font-size:24px}
  .cta{padding:34px 22px}
  .footer .cols{grid-template-columns:1fr}
  .topbar .wrap{font-size:12px}
}

/* ---------- Hero dark theme (大气深色首屏) ---------- */
.hero h1{color:#fff}
.hero h1 .hl{color:#ffb070}
.hero .slogan-hero{color:#bfe0ff}
.hero p.lead{color:#c4d2e3}
.hero-art{box-shadow:0 22px 56px rgba(0,0,0,.42);border:1px solid rgba(255,255,255,.16)}
.hero .stats .l{color:#9fb3c8}
.hero .stats>div:not(:last-child)::after{background:rgba(255,255,255,.18)}
.hero .actions .btn{background:var(--accent);color:#fff}
.hero .actions .btn:hover{background:#e6690a}
.hero .actions .btn.ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.55)}
.hero .actions .btn.ghost:hover{background:rgba(255,255,255,.12)}

/* FAQ 技术问答 */
.faq-list{max-width:880px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;margin-bottom:14px;box-shadow:var(--shadow)}
.faq-item h3{font-size:17px;color:var(--blue);margin-bottom:8px;line-height:1.5}
.faq-item p{color:var(--sub);line-height:1.85;font-size:15px}
.faq-item strong{color:var(--ink)}
.faq-cat{font-size:20px;color:var(--ink);font-weight:700;max-width:880px;margin:36px auto 14px;padding-left:13px;border-left:4px solid var(--accent);line-height:1.3}
.faq-cat:first-of-type{margin-top:6px}
.faq-cat small{display:block;font-size:13px;color:var(--muted);font-weight:400;margin-top:4px}
.articles{max-width:880px;margin:18px auto 0;display:grid;grid-template-columns:1fr 1fr;gap:16px}
.article{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.article .tag{display:inline-block;font-size:12px;color:var(--accent);border:1px solid var(--accent);border-radius:20px;padding:2px 10px;margin-bottom:10px}
.article h3{color:var(--blue);font-size:17px;margin-bottom:10px;line-height:1.5}
.article p{color:var(--sub);line-height:1.85;font-size:14px}
.article p+p{margin-top:10px}
@media(max-width:720px){.articles{grid-template-columns:1fr}}