:root{
  --primary:#1552d6; --primary-dark:#0e3fa8; --ink:#0d1526; --muted:#5b6472;
  --bg:#ffffff; --bg-soft:#f6f8fb; --border:#e7ebf1; --radius:14px;
  --topbar:#0d1b33; --wa:#25d366;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter','Segoe UI',Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none;transition:color .15s}
a:hover{color:var(--primary-dark)}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
h1,h2,h3,h4{line-height:1.25;font-weight:700;letter-spacing:-.01em}

/* ===== 顶部联系条 ===== */
.topbar{background:var(--topbar);color:#c8d3e6;font-size:13px}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;min-height:38px;gap:16px;flex-wrap:wrap}
.topbar-contact{display:flex;gap:22px;flex-wrap:wrap}
.topbar-item{color:#c8d3e6;display:inline-flex;align-items:center;gap:6px}
.topbar-item:hover{color:#fff}
.topbar-item svg{flex:none}
.topbar-wa svg{color:var(--wa)}
.topbar-right{display:flex;align-items:center}
.lang-switcher{position:relative}
.lang-btn{display:inline-flex;align-items:center;gap:6px;background:none;border:0;color:#c8d3e6;font:inherit;font-size:13px;cursor:pointer;padding:8px 0}
.lang-btn:hover{color:#fff}
.lang-menu{position:absolute;right:0;top:100%;background:#fff;color:var(--ink);border:1px solid var(--border);border-radius:10px;box-shadow:0 12px 32px rgba(13,21,38,.14);min-width:170px;list-style:none;padding:6px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.18s;z-index:60}
.lang-menu.open{opacity:1;visibility:visible;transform:translateY(0)}
.lang-menu a{display:block;padding:8px 12px;border-radius:8px;color:var(--ink);font-size:13.5px}
.lang-menu a:hover{background:var(--bg-soft)}
.lang-menu a.active{color:var(--primary);font-weight:600}

/* ===== 主导航 ===== */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:74px}
.logo{display:flex;align-items:center;gap:12px;color:var(--ink)}
.logo-text{display:flex;flex-direction:column;font-weight:800;font-size:18px;letter-spacing:.02em;line-height:1.2}
.logo-text small{font-weight:500;font-size:11px;color:var(--muted);letter-spacing:.01em;max-width:260px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.main-nav{display:flex;gap:6px}
.main-nav a{color:var(--ink);font-weight:500;font-size:15px;padding:8px 14px;border-radius:10px}
.main-nav a:hover{background:var(--bg-soft);color:var(--primary);text-decoration:none}
.header-right{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none;background:none;border:0;font-size:24px;cursor:pointer;color:var(--ink);line-height:1;padding:6px}
.hide-mobile{display:inline-flex}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 28px;border-radius:12px;font-weight:600;font-size:15px;border:1.5px solid transparent;cursor:pointer;transition:.18s;text-decoration:none}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);color:#fff}
.btn-outline{border-color:var(--border);color:var(--ink);background:#fff}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-wa{background:var(--wa);color:#fff}
.btn-wa:hover{background:#1fb959;color:#fff}
.btn-sm{padding:9px 18px;font-size:13.5px;border-radius:10px}

/* ===== Hero ===== */
.hero{background:linear-gradient(180deg,#f6f8fb 0%,#fff 100%);padding:90px 0 70px;text-align:center;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(900px 380px at 50% -80px,rgba(21,82,214,.07),transparent);pointer-events:none}
.hero h1{font-size:clamp(30px,4.6vw,52px);font-weight:800;max-width:860px;margin:0 auto 18px}
.hero p{font-size:clamp(16px,2vw,19px);color:var(--muted);max-width:700px;margin:0 auto 34px}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-tag{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--primary);background:rgba(21,82,214,.08);border-radius:99px;padding:6px 16px;margin-bottom:22px}

/* ===== 数据条 ===== */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin:-34px auto 0;position:relative;z-index:2;max-width:1080px;background:#fff}
.stat-card{background:#fff;padding:26px 16px;text-align:center}
.stat-card b{display:block;font-size:clamp(24px,3vw,34px);font-weight:800;color:var(--ink)}
.stat-card span{font-size:13.5px;color:var(--muted)}

/* ===== 区块 ===== */
.section{padding:76px 0}
.section.soft{background:var(--bg-soft)}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:34px}
.section-title{font-size:clamp(24px,3vw,32px);font-weight:800}
.section-sub{color:var(--muted);max-width:640px;margin-top:10px}
.eyebrow{display:block;font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--primary);margin-bottom:10px}

/* ===== 产品卡片 ===== */
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.product-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;color:var(--ink);display:flex;flex-direction:column;transition:.2s}
.product-card:hover{border-color:transparent;box-shadow:0 16px 40px rgba(13,21,38,.10);transform:translateY(-3px);text-decoration:none;color:var(--ink)}
.product-card .thumb{aspect-ratio:4/3;background:var(--bg-soft);border-bottom:1px solid var(--border)}
.product-card .thumb img{width:100%;height:100%;object-fit:cover}
.product-card .body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.product-card .cat{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--primary)}
.product-card h3{font-size:17px;font-weight:700}
.product-card p{font-size:14px;color:var(--muted);flex:1}
.product-card .more{font-size:14px;font-weight:600;color:var(--primary)}

/* ===== 为什么选择我们 ===== */
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.why-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px}
.why-card .num{font-size:13px;font-weight:800;color:var(--primary);letter-spacing:.08em}
.why-card h3{font-size:17px;margin:10px 0 8px}
.why-card p{font-size:14px;color:var(--muted)}

/* ===== 应用行业 ===== */
.industry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.industry-item{background:#fff;border:1px solid var(--border);border-radius:12px;padding:20px;font-size:15px;font-weight:600;color:var(--ink);text-align:center}

/* ===== 新闻 ===== */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.news-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;color:var(--ink);display:flex;flex-direction:column;gap:10px;transition:.2s}
.news-card:hover{border-color:transparent;box-shadow:0 16px 40px rgba(13,21,38,.10);transform:translateY(-3px);text-decoration:none;color:var(--ink)}
.news-card time{font-size:13px;color:var(--muted)}
.news-card h3{font-size:17px}
.news-card p{font-size:14px;color:var(--muted);flex:1}
.news-card .more{font-size:14px;font-weight:600;color:var(--primary)}

/* ===== CTA ===== */
.cta-band{background:var(--topbar);color:#fff;border-radius:20px;padding:56px 40px;display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap}
.cta-band h2{font-size:clamp(22px,3vw,30px);color:#fff}
.cta-band p{color:#9fb0cc;margin-top:8px}

/* ===== 内页横幅 & 面包屑 ===== */
.page-banner{background:var(--bg-soft);border-bottom:1px solid var(--border);padding:52px 0 40px}
.page-banner h1{font-size:clamp(26px,3.6vw,38px);margin-bottom:10px}
.breadcrumb{font-size:14px;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:#c3cad6}

/* ===== 产品列表 ===== */
.cat-filter{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:34px}
.cat-filter a{padding:9px 20px;border:1px solid var(--border);border-radius:99px;font-size:14px;font-weight:500;color:var(--ink)}
.cat-filter a:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}
.cat-filter a.active{background:var(--primary);border-color:var(--primary);color:#fff}

/* ===== 产品详情（淘宝式） ===== */
.pd-layout{display:grid;grid-template-columns:420px 1fr;gap:44px;align-items:start}
.pd-gallery{position:sticky;top:110px}
.pd-main-img{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;background:var(--bg-soft)}
.pd-main-img img{width:100%;height:100%;object-fit:cover}
.pd-thumbs{display:flex;gap:10px;margin-top:12px}
.pd-thumbs button{width:72px;height:56px;border:1px solid var(--border);border-radius:10px;overflow:hidden;background:none;padding:0;cursor:pointer}
.pd-thumbs button img{width:100%;height:100%;object-fit:cover}
.pd-info h1{font-size:clamp(22px,2.8vw,30px);font-weight:800}
.pd-info .pd-cat{color:var(--primary);font-weight:600;font-size:14px;margin-bottom:10px;display:inline-block}
.pd-short{color:var(--muted);margin:16px 0 22px;font-size:15px}
.pd-pricebox{background:var(--bg-soft);border-radius:12px;padding:18px 20px;display:flex;align-items:center;gap:22px;flex-wrap:wrap;margin-bottom:24px}
.pd-pricebox .label{font-size:13px;color:var(--muted);font-weight:600}
.pd-pricebox .value{font-size:22px;font-weight:800;color:var(--primary)}
.pd-pricebox .moq{font-size:14px;color:var(--muted)}
.pd-quickfacts{display:grid;grid-template-columns:1fr 1fr;gap:12px 24px;margin-bottom:24px;list-style:none}
.pd-quickfacts li{font-size:14.5px;display:flex;gap:8px}
.pd-quickfacts li::before{content:"✓";color:var(--primary);font-weight:800}
.pd-contact-row{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:26px}
.pd-seller{border:1px solid var(--border);border-radius:12px;padding:18px 20px;display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.pd-seller .avatar{width:48px;height:48px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;flex:none}
.pd-seller b{display:block;font-size:15px}
.pd-seller span{font-size:13.5px;color:var(--muted)}
.pd-seller .links{display:flex;gap:14px;margin-left:auto;flex-wrap:wrap}
.pd-seller .links a{font-size:14px;font-weight:600}

/* 详情分节 */
.pd-sections{margin-top:64px}
.pd-sections h2{font-size:22px;margin-bottom:18px;padding-left:14px;border-left:4px solid var(--primary)}
.pd-section{padding:8px 0 34px;border-bottom:1px solid var(--border);margin-bottom:34px}
.pd-section:last-child{border-bottom:0}
.pd-section p{margin-bottom:12px;max-width:860px}
.spec-table{width:100%;border-collapse:collapse;max-width:860px;font-size:14.5px}
.spec-table th,.spec-table td{border:1px solid var(--border);padding:11px 16px;text-align:left;vertical-align:top}
.spec-table th{background:var(--bg-soft);font-weight:600;width:220px}
.faq-list{max-width:860px}
.faq-item{border:1px solid var(--border);border-radius:12px;margin-bottom:12px;overflow:hidden}
.faq-item summary{cursor:pointer;padding:15px 20px;font-weight:600;font-size:15px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:20px;color:var(--primary);font-weight:700;transition:.2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item .faq-body{padding:0 20px 16px;color:var(--muted);font-size:14.5px}
.badge-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px}
.badge{border:1px solid var(--border);border-radius:99px;padding:5px 14px;font-size:13px;font-weight:600;color:var(--ink)}

/* 详情页内询盘表单 */
.inquiry-box{background:var(--bg-soft);border-radius:var(--radius);padding:30px;max-width:860px}
.inquiry-box h3{font-size:18px;margin-bottom:6px}
.inquiry-box .sub{font-size:14px;color:var(--muted);margin-bottom:18px}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:13.5px;font-weight:600;margin-bottom:6px}
.form-group input,.form-group textarea{width:100%;border:1px solid var(--border);border-radius:10px;padding:12px 14px;font:inherit;font-size:14.5px;background:#fff;color:var(--ink)}
.form-group input:focus,.form-group textarea:focus{outline:2px solid rgba(21,82,214,.25);border-color:var(--primary)}

/* ===== 联系页 ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:44px;align-items:start}
.contact-box{border:1px solid var(--border);border-radius:var(--radius);padding:28px}
.contact-box ul{list-style:none;display:flex;flex-direction:column;gap:16px}
.contact-box li{display:flex;flex-direction:column;gap:2px}
.contact-box li b{font-size:13px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.06em}
.contact-box li a,.contact-box li span{font-size:15.5px}
.wa-cta{background:rgba(37,211,102,.08);border:1px solid rgba(37,211,102,.35);border-radius:12px;padding:16px 20px;margin-top:20px;font-size:14.5px}
.wa-cta a{font-weight:700;color:#128c4b}

/* ===== 提示 ===== */
.alert{border-radius:10px;padding:14px 18px;font-size:14.5px;margin-bottom:18px}
.alert-ok{background:#e8f7ee;color:#137a3d;border:1px solid #b7e4c9}
.alert-err{background:#fdeeee;color:#b02a2a;border:1px solid #f2c4c4}

/* ===== 关于页 ===== */
.about-content{max-width:860px}
.about-content p{margin-bottom:16px;font-size:15.5px}
.about-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin:40px 0}
.cert-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;max-width:860px}
.cert-item{border:1px solid var(--border);border-radius:12px;padding:20px;font-weight:600;font-size:14.5px;text-align:center}

/* ===== 页脚 ===== */
.site-footer{background:var(--topbar);color:#c8d3e6;margin-top:0;padding:60px 0 0;font-size:14.5px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:40px;padding-bottom:44px}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:16px}
.site-footer p{color:#9fb0cc;line-height:1.7}
.site-footer a{color:#c8d3e6}
.site-footer a:hover{color:#fff}
.site-footer ul{list-style:none;display:flex;flex-direction:column;gap:10px}
.footer-badges{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.footer-badges span{border:1px solid rgba(255,255,255,.18);border-radius:99px;padding:3px 12px;font-size:12px;color:#c8d3e6}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:20px 0;font-size:13px;color:#8296b5}
.contact-list li{display:flex;flex-direction:column}
.whatsapp-float{position:fixed;right:22px;bottom:26px;width:58px;height:58px;border-radius:50%;background:var(--wa);display:flex;align-items:center;justify-content:center;box-shadow:0 10px 28px rgba(37,211,102,.45);z-index:80;transition:.2s}
.whatsapp-float:hover{transform:scale(1.08)}

/* ===== 移动端底部联系条 ===== */
.mobile-contact-bar{display:none;position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--border);z-index:70;padding:8px 6px calc(8px + env(safe-area-inset-bottom));grid-template-columns:1fr 1fr 1fr;gap:6px}
.mobile-contact-bar a{display:flex;flex-direction:column;align-items:center;gap:3px;font-size:11.5px;font-weight:600;color:var(--ink);padding:4px 2px;border-radius:10px}
.mobile-contact-bar a svg{color:var(--primary)}
.mobile-contact-bar .mcb-wa svg{color:var(--wa)}
@media (max-width:768px){
  .mobile-contact-bar{display:grid}
  .whatsapp-float{display:none}
  body{padding-bottom:62px}
}

/* ===== 响应式 ===== */
@media (max-width:1024px){
  .pd-layout{grid-template-columns:1fr}
  .pd-gallery{position:static}
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .why-grid{grid-template-columns:repeat(2,1fr)}
  .industry-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:repeat(2,1fr)}
  .about-stats{grid-template-columns:repeat(2,1fr)}
  .cert-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:768px){
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--border);flex-direction:column;padding:12px 20px 18px;gap:2px;box-shadow:0 20px 40px rgba(13,21,38,.08)}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
  .hide-mobile{display:none}
  .topbar-contact{gap:14px}
  .product-grid,.news-grid{grid-template-columns:1fr}
  .section{padding:52px 0}
  .hero{padding:60px 0 50px}
  .contact-grid{grid-template-columns:1fr}
  .cta-band{padding:36px 24px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .pd-quickfacts{grid-template-columns:1fr}
  .section-head{flex-direction:column;align-items:flex-start}
  .logo-text small{display:none}
  .spec-table th{width:130px}
}