:root{
  --brand:#185FA5;
  --brand-dark:#0c447c;
  --brand-light:#E6F1FB;
  --accent:#D85A30;
  --accent-dark:#993C1D;
  --ink:#0f172a;
  --text:#334155;
  --muted:#64748b;
  --line:#e2e8f0;
  --bg:#ffffff;
  --bg-soft:#f8fafc;
  --radius:12px;
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.65;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}
h1,h2,h3,h4{color:var(--ink);line-height:1.3;font-weight:600}
.btn{display:inline-block;padding:13px 26px;border-radius:8px;font-weight:600;font-size:15px;transition:.18s;cursor:pointer;border:1px solid transparent}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark)}
.btn-brand{background:var(--brand);color:#fff}
.btn-brand:hover{background:var(--brand-dark)}
.btn-ghost{background:#fff;color:var(--brand);border-color:var(--brand)}
.btn-ghost:hover{background:var(--brand-light)}
.btn-lg{padding:16px 34px;font-size:16px}

/* ===== Header / Nav ===== */
.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--ink)}
.logo .mark{width:34px;height:34px;border-radius:9px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:700}
.logo small{display:block;font-size:11px;color:var(--muted);font-weight:400;letter-spacing:1px}
.nav-menu{display:flex;align-items:center;gap:4px;list-style:none}
.nav-menu>li{position:relative}
.nav-menu>li>a{display:block;padding:10px 14px;font-size:15px;color:var(--text);border-radius:8px;font-weight:500}
.nav-menu>li>a:hover{color:var(--brand);background:var(--bg-soft)}
.nav-menu>li.active>a{color:var(--brand)}
.nav-cta{margin-left:10px}
.dropdown{position:absolute;top:100%;left:0;min-width:230px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 12px 32px rgba(15,23,42,.10);padding:8px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.16s}
.nav-menu>li:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:block;padding:9px 12px;border-radius:7px;font-size:14px;color:var(--text)}
.dropdown a:hover{background:var(--brand-light);color:var(--brand)}
.dropdown .tag{font-size:11px;color:var(--muted);margin-left:6px}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.hamburger span{width:24px;height:2px;background:var(--ink);border-radius:2px}
.mobile-menu{display:none;flex-direction:column;padding:10px 20px 20px;border-top:1px solid var(--line);background:#fff}
.mobile-menu.open{display:flex}
.mobile-menu a{padding:12px 4px;border-bottom:1px solid var(--line);font-weight:500}
.mobile-menu .sub{padding-left:18px;font-size:14px;color:var(--muted)}

/* ===== Hero ===== */
.hero{background:linear-gradient(180deg,#f4f8fc 0%,#ffffff 100%);padding:72px 0 64px}
.hero h1{font-size:42px;letter-spacing:-.5px;margin-bottom:18px}
.hero h1 .hl{color:var(--brand)}
.hero p.lead{font-size:18px;color:var(--muted);max-width:640px;margin-bottom:30px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:34px}
.hero-stats{display:flex;gap:38px;flex-wrap:wrap}
.hero-stats .s b{display:block;font-size:26px;color:var(--brand)}
.hero-stats .s span{font-size:13px;color:var(--muted)}

/* ===== Section ===== */
.section{padding:64px 0}
.section.soft{background:var(--bg-soft)}
.section h2{font-size:30px;text-align:center;margin-bottom:10px}
.section .sub{text-align:center;color:var(--muted);margin-bottom:42px;font-size:16px}
.eyebrow{color:var(--accent);font-weight:700;font-size:13px;letter-spacing:1px;text-transform:uppercase;text-align:center;display:block;margin-bottom:8px}

/* ===== Cards grid ===== */
.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:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.18s}
.card:hover{box-shadow:0 10px 30px rgba(15,23,42,.07);transform:translateY(-3px)}
.card .ic{width:46px;height:46px;border-radius:11px;background:var(--brand-light);color:var(--brand);display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.card h3{font-size:18px;margin-bottom:8px}
.card p{font-size:14px;color:var(--muted)}
.card .more{color:var(--brand);font-weight:600;font-size:14px;margin-top:12px;display:inline-block}

.line-card{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);padding:30px;background:#fff}
.line-card .badge{position:absolute;top:18px;right:18px;font-size:12px;padding:4px 10px;border-radius:20px;background:var(--brand-light);color:var(--brand);font-weight:600}
.line-card h3{font-size:21px;margin-bottom:6px}
.line-card .desc{color:var(--muted);font-size:14px;margin-bottom:16px;min-height:42px}
.line-card ul{list-style:none;margin:0 0 18px}
.line-card ul li{padding:5px 0 5px 22px;position:relative;font-size:14px}
.line-card ul li:before{content:"";position:absolute;left:0;top:12px;width:7px;height:7px;border-radius:50%;background:var(--accent)}
.line-card.catering{border-top:3px solid #E24B4A}
.line-card.retail{border-top:3px solid #185FA5}
.line-card.software{border-top:3px solid #639922}
.line-card.hardware{border-top:3px solid #BA7517}

/* ===== Feature list ===== */
.feat{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:10px}
.feat .item{display:flex;gap:12px;align-items:flex-start}
.feat .item .dot{flex:0 0 34px;height:34px;border-radius:9px;background:var(--brand-light);color:var(--brand);display:flex;align-items:center;justify-content:center;font-weight:700}
.feat .item h4{font-size:15px;margin-bottom:2px}
.feat .item p{font-size:13px;color:var(--muted)}

/* ===== Steps ===== */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:s}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;position:relative}
.step:before{counter-increment:s;content:counter(s);position:absolute;top:-14px;left:24px;width:34px;height:34px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.step h4{margin:10px 0 6px;font-size:16px}
.step p{font-size:13px;color:var(--muted)}

/* ===== CTA band ===== */
.cta-band{background:var(--brand);color:#fff;border-radius:16px;padding:48px;text-align:center;margin:0 0 64px}
.cta-band h2{color:#fff;font-size:28px;margin-bottom:12px}
.cta-band p{color:#cfe2f5;margin-bottom:24px;font-size:16px}
.cta-band .btn-primary{background:#fff;color:var(--brand)}

/* ===== Footer ===== */
.footer{background:#0f172a;color:#cbd5e1;padding:52px 0 28px;margin-top:0}
.footer .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px}
.footer h4{color:#fff;font-size:15px;margin-bottom:16px}
.footer a{color:#cbd5e1;font-size:14px;display:block;padding:5px 0}
.footer a:hover{color:#fff}
.footer .brand .logo{color:#fff;margin-bottom:12px}
.footer .brand p{font-size:13px;color:#94a3b8;max-width:300px}
.footer .bottom{border-top:1px solid #1e293b;margin-top:36px;padding-top:18px;font-size:13px;color:#94a3b8;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* ===== Breadcrumb / page head ===== */
.page-head{background:var(--brand-light);padding:46px 0 38px}
.page-head h1{font-size:34px;margin-bottom:8px}
.page-head p{color:var(--muted);font-size:16px;max-width:680px}

/* ===== Form ===== */
.form-wrap{max-width:560px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px}
.field{margin-bottom:18px}
.field label{display:block;font-weight:600;font-size:14px;margin-bottom:7px;color:var(--ink)}
.field input,.field select,.field textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:8px;font-size:15px;font-family:inherit;color:var(--ink)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-light)}
.form-note{font-size:13px;color:var(--muted);text-align:center;margin-top:14px}
.form-ok{display:none;background:#EAF3DE;border:1px solid #97C459;color:#27500A;padding:14px 16px;border-radius:8px;margin-bottom:16px;font-size:14px}

/* ===== Table ===== */
.table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.table th,.table td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}
.table th{background:var(--bg-soft);color:var(--ink);font-weight:600}
.table tr:last-child td{border-bottom:0}

/* ===== 产品中心（子菜单切换） ===== */
.prod-center{padding:34px 0 64px}
.subtabs{display:flex;flex-wrap:wrap;gap:6px;border-bottom:1px solid var(--line);margin-bottom:30px}
.subtab{appearance:none;background:none;border:0;border-bottom:2px solid transparent;padding:12px 16px;font-size:15px;font-weight:600;color:var(--muted);cursor:pointer;transition:.15s;font-family:inherit}
.subtab:hover{color:var(--brand)}
.subtab.active{color:var(--brand);border-bottom-color:var(--brand)}
.tabpanel.is-hidden{display:none}
.panel-grid{display:grid;grid-template-columns:1fr 1.3fr;gap:40px;align-items:start}
.panel-summary .ic.big{width:58px;height:58px;border-radius:14px;background:var(--brand-light);color:var(--brand);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.panel-summary h3{font-size:24px;margin-bottom:10px}
.tag-pill{display:inline-block;font-size:12px;padding:4px 12px;border-radius:20px;background:var(--accent);color:#fff;font-weight:600;margin-bottom:14px}
.panel-summary p{color:var(--text);margin-bottom:20px;font-size:15px}
.feat-list{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:14px}
.feat-list li{display:flex;gap:10px;align-items:flex-start}
.feat-list .dot{flex:0 0 30px;height:30px;border-radius:8px;background:var(--brand-light);color:var(--brand);display:flex;align-items:center;justify-content:center}
.feat-list b{font-size:14px;color:var(--ink)}
.feat-list p{font-size:12px;color:var(--muted);margin-top:2px}
.panel-feats h4{font-size:17px;margin-bottom:14px}

/* ===== 下载中心 ===== */
.dl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.dl-card{border:1px solid var(--line);border-radius:var(--radius);padding:24px;background:#fff}
.dl-card:hover{box-shadow:0 10px 30px rgba(15,23,42,.07)}
.dl-head{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.dl-head .ic{width:42px;height:42px;border-radius:11px;background:var(--brand-light);color:var(--brand);display:flex;align-items:center;justify-content:center}
.dl-head h3{font-size:18px}
.dl-list{list-style:none}
.dl-list li{display:flex;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid var(--line)}
.dl-list li:last-child{border-bottom:0}
.dl-name{font-weight:600;color:var(--ink);min-width:130px}
.dl-desc{color:var(--muted);font-size:13px;flex:1}
.dl-btn{padding:8px 18px;font-size:13px}

/* ===== 帮助中心 FAQ ===== */
.faq{max-width:820px;margin:0 auto;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:last-child{border-bottom:0}
.faq-q{width:100%;text-align:left;background:none;border:0;padding:18px 22px;font-size:16px;font-weight:600;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-family:inherit}
.faq-ic{font-size:22px;color:var(--brand);font-weight:400}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease}
.faq-a p{padding:0 22px 18px;color:var(--muted);font-size:14px}
.faq-item.open .faq-a{max-height:220px}
.faq-item.open .faq-ic{transform:rotate(45deg)}

/* ===== Responsive ===== */
@media(max-width:960px){
  .nav-menu,.nav-cta{display:none}
  .hamburger{display:flex}
  .grid-4,.grid-3,.feat,.steps{grid-template-columns:repeat(2,1fr)}
  .panel-grid{grid-template-columns:1fr;gap:24px}
  .dl-grid{grid-template-columns:1fr}
  .footer .cols{grid-template-columns:1fr 1fr}
  .hero h1{font-size:32px}
}
@media(max-width:600px){
  .grid-2,.grid-3,.grid-4,.feat,.steps,.feat-list{grid-template-columns:1fr}
  .footer .cols{grid-template-columns:1fr}
  .dl-list li{flex-wrap:wrap}
  .hero-stats{gap:22px}
  .cta-band{padding:34px 22px}
  .hero h1{font-size:27px}
  .section h2{font-size:24px}
}