/* ===== 实力工业风 · 深蓝 + 橙 ===== */
:root{
  --navy:#0b2d5c;
  --navy-dark:#071c3a;
  --navy-soft:#133f7c;
  --accent:#ff6a00;
  --accent-dark:#e05500;
  --text:#222a36;
  --text-light:#67738a;
  --bg:#ffffff;
  --bg-gray:#f4f6f9;
  --border:#e2e7ef;
  --radius:4px;
  --shadow:0 4px 16px rgba(11,45,92,.10);
  --shadow-lg:0 12px 32px rgba(11,45,92,.18);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--text);background:var(--bg);line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* 通用小标签 */
.section-tag{
  display:inline-flex;align-items:center;gap:7px;font-size:12px;letter-spacing:2px;
  color:var(--accent);font-weight:700;margin-bottom:10px;text-transform:uppercase;
}
.section-tag::before{content:"";width:14px;height:3px;background:var(--accent);display:block}

/* ===== 导航：深蓝底 ===== */
.navbar{position:fixed;top:0;left:0;right:0;z-index:100;background:var(--navy-dark);transition:.3s}
.navbar.scrolled{box-shadow:0 2px 14px rgba(0,0,0,.28)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;color:#fff;letter-spacing:.5px}
.brand-logo{
  width:34px;height:34px;flex:none;background:var(--accent);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800;
  border-radius:2px;
}
.brand-logo img{width:100%;height:100%;object-fit:contain}
.brand-text small{display:block;font-size:10px;font-weight:400;color:rgba(255,255,255,.55);letter-spacing:1px}
.nav-links{display:flex;gap:26px;margin-left:auto}
.nav-links a{font-size:14.5px;color:rgba(255,255,255,.85);position:relative;padding:6px 0;transition:.2s}
.nav-links a:hover,.nav-links a.active{color:#fff}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--accent)}
/* 语言切换按钮 */
.lang-switch{
  flex:none;margin-left:auto;font-size:13px;font-weight:700;letter-spacing:.6px;
  color:rgba(255,255,255,.9);border:1px solid rgba(255,255,255,.4);
  border-radius:2px;padding:5px 13px;transition:.2s;
}
.lang-switch:hover{background:var(--accent);border-color:var(--accent);color:#fff}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{width:22px;height:2px;background:#fff;display:block}

/* ===== Banner ===== */
.hero{position:relative;padding:140px 0 0;color:#fff;background:var(--navy-dark);overflow:hidden}
.hero-bg{
  position:absolute;inset:0;background:var(--navy);
  background-image:repeating-linear-gradient(115deg,rgba(255,255,255,.035) 0 2px,transparent 2px 14px);
}
.hero-bg::after{
  content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 78% 25%,rgba(255,106,0,.25),transparent 55%);
}
.hero-inner{position:relative;z-index:1;padding-bottom:70px}
.hero-eyebrow{font-size:12px;letter-spacing:4px;color:var(--accent);font-weight:700;margin-bottom:16px}
.hero-title{font-size:48px;line-height:1.22;font-weight:800;max-width:840px;margin-bottom:20px;letter-spacing:-.5px}
.hero-sub{font-size:17px;color:rgba(255,255,255,.8);max-width:700px;margin-bottom:34px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-block;padding:14px 34px;font-size:15px;font-weight:700;cursor:pointer;
  border:none;border-radius:2px;transition:.25s;letter-spacing:.5px;
}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px);box-shadow:0 8px 22px rgba(255,106,0,.35)}
.btn-ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.5)}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.hero-stats{
  position:relative;z-index:1;display:grid;grid-template-columns:repeat(4,1fr);
  background:var(--navy-dark);border-top:3px solid var(--accent);
}
.hero-stats>div{padding:26px 20px;text-align:center;border-left:1px solid rgba(255,255,255,.12)}
.hero-stats>div:first-child{border-left:none}
.stat-num{font-size:34px;font-weight:800;color:var(--accent);line-height:1.1}
.stat-label{font-size:13px;color:rgba(255,255,255,.7);margin-top:4px}

/* ===== 区块 ===== */
.section{padding:80px 0}
.section-gray{background:var(--bg-gray)}
.section-head{margin-bottom:44px}
.section-head.center{text-align:center}
.section-head.center .section-tag{justify-content:center}
.section-head.center::after{content:"";display:block;width:56px;height:3px;background:var(--accent);margin:14px auto 0}
.section-head h2{font-size:31px;font-weight:800;color:var(--navy);letter-spacing:-.3px}
.section-head.center::after{margin:14px auto 0}
.section-desc{color:var(--text-light);max-width:760px;font-size:15px;margin-top:10px}

/* ===== 产品 ===== */
.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:30px}
.filter-btn{
  padding:9px 22px;border:1px solid var(--border);background:#fff;font-size:14px;
  cursor:pointer;transition:.2s;color:var(--text);border-radius:2px;font-weight:500;
}
.filter-btn:hover{border-color:var(--accent);color:var(--accent)}
.filter-btn.active{background:var(--navy);border-color:var(--navy);color:#fff}
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(265px,1fr));gap:22px}
.product-card{
  background:#fff;border:1px solid var(--border);border-top:3px solid var(--navy);
  transition:.25s;display:flex;flex-direction:column;
}
.product-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-top-color:var(--accent)}
.product-img{aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;background:#eef1f6;position:relative}
.product-img img{width:100%;height:100%;object-fit:cover}
.product-img .ph{font-size:13px;color:#98a3b5;display:flex;flex-direction:column;align-items:center;gap:8px}
.product-tag{
  position:absolute;top:0;left:0;background:var(--navy);color:#fff;font-size:11px;
  padding:4px 12px;letter-spacing:.5px;
}
.product-body{padding:18px;flex:1;display:flex;flex-direction:column}
.product-name{font-size:16px;font-weight:700;color:var(--navy);margin-bottom:3px}
.product-model{font-size:12px;color:var(--accent);font-weight:700;letter-spacing:1px;margin-bottom:8px}
.product-desc{font-size:13.5px;color:var(--text-light);flex:1}
.product-spec{
  margin-top:12px;padding-top:12px;border-top:1px dashed var(--border);
  font-size:12.5px;color:var(--text-light);display:flex;justify-content:space-between;
}
.product-spec b{color:var(--navy);font-weight:700}
.empty-tip{text-align:center;color:var(--text-light);padding:40px 0}

/* ===== 品质对比表 ===== */
.compare-wrap{overflow-x:auto;border:1px solid var(--border)}
table.compare{width:100%;border-collapse:collapse;min-width:620px;font-size:14.5px}
table.compare th,table.compare td{padding:15px 18px;text-align:left;border-bottom:1px solid var(--border)}
table.compare thead th{background:var(--navy);color:#fff;font-weight:700;font-size:14px}
table.compare thead th.ours{background:var(--accent)}
table.compare tbody tr:nth-child(even){background:#fafbfd}
table.compare td:first-child{font-weight:700;color:var(--navy)}
table.compare td.ours{color:var(--accent-dark);font-weight:700;background:rgba(255,106,0,.06)}
table.compare tbody tr:hover{background:#f2f5fa}

/* ===== 制造实力 ===== */
.equip-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:18px;margin-bottom:36px}
.equip-card{
  background:var(--navy);color:#fff;padding:26px 22px;border-radius:2px;position:relative;overflow:hidden;
}
.equip-card::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:3px;background:var(--accent)}
.equip-num{font-size:36px;font-weight:800;color:var(--accent);line-height:1}
.equip-name{font-size:15px;font-weight:700;margin:10px 0 6px}
.equip-desc{font-size:13px;color:rgba(255,255,255,.72)}
.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px}
.gallery-ph{
  aspect-ratio:4/3;background:linear-gradient(135deg,#e7ecf3,#d7dee9);border-radius:2px;
  display:flex;align-items:center;justify-content:center;color:#93a0b1;font-size:13px;
}
.gallery img{aspect-ratio:4/3;object-fit:cover;border-radius:2px}

/* ===== 检测品控 ===== */
.qc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:18px;margin-top:30px}
.qc-card{background:#fff;border:1px solid var(--border);padding:22px;border-left:3px solid var(--accent)}
.qc-step{
  display:inline-flex;width:26px;height:26px;background:var(--navy);color:#fff;border-radius:50%;
  align-items:center;justify-content:center;font-size:13px;font-weight:700;margin-bottom:10px;
}
.qc-name{font-size:15px;font-weight:700;color:var(--navy);margin-bottom:6px}
.qc-desc{font-size:13px;color:var(--text-light)}

/* ===== 成本账 ===== */
.cost-wrap{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:stretch}
.cost-col{background:#fff;border:1px solid var(--border);padding:28px}
.cost-col.bad{border-top:3px solid #98a3b5}
.cost-col.good{border-top:3px solid var(--accent)}
.cost-col h3{font-size:17px;font-weight:800;margin-bottom:6px}
.cost-col.bad h3{color:#77808f}
.cost-col.good h3{color:var(--accent-dark)}
.cost-col .sub{font-size:13px;color:var(--text-light);margin-bottom:18px}
.cost-col li{padding:11px 0;border-bottom:1px dashed var(--border);font-size:14px;display:flex;gap:10px}
.cost-col li:last-child{border:none}
.cost-col.bad li::before{content:"✕";color:#98a3b5;font-weight:700}
.cost-col.good li::before{content:"✓";color:var(--accent);font-weight:700}
.cost-total{margin-top:16px;padding-top:14px;border-top:2px solid var(--border);font-size:15px;font-weight:800}
.cost-col.good .cost-total{color:var(--accent-dark)}
.cost-conclusion{
  margin-top:26px;background:var(--navy);color:#fff;padding:24px 28px;border-left:4px solid var(--accent);
  font-size:15.5px;line-height:1.75;
}

/* ===== 关于 ===== */
.about-wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:52px;align-items:start}
.about-text p{color:var(--text-light);margin-bottom:15px;font-size:15px}
.about-adv{display:grid;grid-template-columns:repeat(auto-fit,minmax(175px,1fr));gap:14px}
.adv-card{background:var(--bg-gray);padding:18px;border-left:3px solid var(--navy)}
.adv-card h4{font-size:14.5px;color:var(--navy);margin-bottom:6px;font-weight:700}
.adv-card p{font-size:13px;color:var(--text-light)}

/* ===== 资质 ===== */
.cert-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(165px,1fr));gap:16px}
.cert-card{
  background:#fff;border:1px solid var(--border);padding:26px 16px;text-align:center;transition:.25s;
}
.cert-card:hover{border-color:var(--accent);transform:translateY(-4px);box-shadow:var(--shadow)}
.cert-icon{
  width:50px;height:50px;margin:0 auto 14px;background:#fff3ec;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
}
.cert-icon svg{stroke:var(--accent)}
.cert-name{font-size:14.5px;font-weight:700;color:var(--navy);margin-bottom:4px}
.cert-desc{font-size:12.5px;color:var(--text-light)}

/* ===== 客户案例 ===== */
.case-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.case-card{background:#fff;border:1px solid var(--border);padding:26px;transition:.25s}
.case-card:hover{box-shadow:var(--shadow);border-color:var(--navy)}
.case-client{font-size:15.5px;font-weight:800;color:var(--navy);margin-bottom:4px}
.case-industry{font-size:12px;color:var(--accent);font-weight:700;letter-spacing:.5px;margin-bottom:12px}
.case-result{font-size:14px;color:var(--text-light)}
.case-num{font-size:26px;font-weight:800;color:var(--navy);margin-bottom:6px}
.case-num span{font-size:13px;font-weight:400;color:var(--text-light);margin-left:4px}

/* ===== 联系 ===== */
.contact-wrap{display:grid;grid-template-columns:1fr 1fr;gap:52px;align-items:start}
.contact-list li{padding:13px 0;border-bottom:1px solid var(--border);display:flex;gap:14px}
.contact-list .label{font-size:13.5px;color:var(--text-light);min-width:74px}
.contact-list .value{font-size:15px;font-weight:700;color:var(--navy)}
.qrcode{margin-top:24px;display:inline-block;text-align:center}
.qrcode-ph{
  width:150px;height:150px;border:1px dashed #c4ccd8;background:#fafbfc;
  display:flex;align-items:center;justify-content:center;color:#96a1b1;font-size:12.5px;
}
.qrcode img{width:150px;height:150px;object-fit:cover}
.qrcode p{font-size:13px;color:var(--text-light);margin-top:8px}
.brochure-btn{
  display:flex;flex-direction:column;gap:2px;margin-top:22px;max-width:340px;
  background:var(--navy);color:#fff;padding:13px 20px;border-left:4px solid var(--accent);
  text-decoration:none;transition:.25s;
}
.brochure-btn span{font-size:14.5px;font-weight:700}
.brochure-btn em{font-style:normal;font-size:11.5px;color:rgba(255,255,255,.62);letter-spacing:.3px;line-height:1.4}
.brochure-btn:hover{background:#14406f;transform:translateY(-2px);box-shadow:0 8px 22px rgba(11,45,92,.25)}
.contact-form{background:#fff;border:1px solid var(--border);border-top:3px solid var(--accent);padding:32px}
.contact-form h3{font-size:19px;color:var(--navy);margin-bottom:20px;font-weight:800}
.contact-form input,.contact-form textarea{
  width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:2px;
  font-size:14px;font-family:inherit;margin-bottom:14px;background:#fff;transition:.2s;
}
.contact-form input:focus,.contact-form textarea:focus{
  outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(255,106,0,.12);
}
.contact-form textarea{resize:vertical}
.contact-form .btn{width:100%}
.form-tip{font-size:13px;color:var(--accent);margin-top:12px;min-height:20px;text-align:center;font-weight:500}

/* ===== 页脚 ===== */
.footer{background:var(--navy-dark);color:rgba(255,255,255,.7);border-top:4px solid var(--accent);padding:44px 0 26px}
.footer-inner{display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center}
.footer-brand{font-size:17px;font-weight:800;color:#fff;letter-spacing:.5px}
.footer-links{display:flex;gap:24px;flex-wrap:wrap;justify-content:center}
.footer-links a{font-size:14px;transition:.2s}
.footer-links a:hover{color:var(--accent)}
.footer-copy{font-size:13px;color:rgba(255,255,255,.45);display:flex;gap:14px;flex-wrap:wrap;justify-content:center}

/* ===== 响应式 ===== */
@media (max-width:960px){
  .about-wrap,.contact-wrap,.cost-wrap{grid-template-columns:1fr;gap:32px}
  .hero-stats{grid-template-columns:repeat(2,1fr)}
  .hero-stats>div:nth-child(3){border-left:none}
  .hero-stats>div:nth-child(n+3){border-top:1px solid rgba(255,255,255,.12)}
}
@media (max-width:768px){
  .nav-toggle{display:flex}
  .nav-links{
    position:absolute;top:64px;left:0;right:0;background:var(--navy-dark);flex-direction:column;
    gap:0;padding:0 24px;max-height:0;overflow:hidden;transition:.3s;
  }
  .nav-links.open{max-height:400px;padding:8px 24px 18px}
  .nav-links a{padding:13px 0;border-bottom:1px solid rgba(255,255,255,.12)}
  .nav-links a::after{display:none}
  .hero{padding:110px 0 0}
  .hero-title{font-size:29px}
  .hero-sub{font-size:15px}
  .stat-num{font-size:26px}
  .section{padding:56px 0}
  .section-head h2{font-size:24px}
  .contact-form{padding:24px}
  .btn{padding:12px 26px}
}