/* ============================================================
   安昇能源 · 官网样式
   视觉方向：工业能源自动化 · 深科技蓝 + 白 + 红点缀
   ============================================================ */
:root{
  --navy-900:#081A33;
  --navy-800:#0B2450;
  --navy-700:#12325F;
  --blue-600:#1E4E9E;
  --blue-500:#2F6FDB;
  --red-600:#E2231A;
  --red-700:#C81D15;
  --ink:#16202E;
  --muted:#5A6B84;
  --bg:#FFFFFF;
  --bg-soft:#F2F5F9;
  --line:#E3E9F1;
  --white:#FFFFFF;
  --shadow-1:0 6px 24px rgba(11,36,80,.08);
  --shadow-2:0 14px 44px rgba(11,36,80,.14);
  --radius:14px;
  --container:1200px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{line-height:1.25;margin:0;}
p{margin:0;}
ul{list-style:none;margin:0;padding:0;}

/* ---------- 容器 ---------- */
.container{max-width:var(--container);margin:0 auto;padding:0 24px;}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  gap:8px;min-height:48px;padding:0 26px;
  font-size:16px;font-weight:600;border-radius:10px;
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--red-600);color:#fff;}
.btn-primary:hover{background:var(--red-700);box-shadow:0 10px 22px rgba(226,35,26,.28);}
.btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.7);}
.btn-outline:hover{background:rgba(255,255,255,.12);border-color:#fff;}
.btn-navy{background:var(--navy-800);color:#fff;}
.btn-navy:hover{background:var(--navy-700);}
.btn-ghost{background:transparent;color:var(--navy-800);border-color:var(--blue-500);}
.btn-ghost:hover{background:var(--bg-soft);}

/* 焦点可见 */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{
  outline:3px solid rgba(47,111,219,.55);outline-offset:2px;border-radius:6px;
}

/* ============================================================
   页头 / 导航
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  max-width:var(--container);margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;height:72px;
}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{
  width:42px;height:42px;border-radius:10px;
  background:linear-gradient(135deg,var(--blue-600),var(--navy-800));
  display:flex;align-items:center;justify-content:center;color:#fff;
}
.brand-mark svg{width:24px;height:24px;}
.brand-name{font-size:20px;font-weight:900;color:var(--navy-800);letter-spacing:.5px;}
.brand-name em{font-style:normal;color:var(--red-600);}

.main-nav{display:flex;align-items:center;gap:6px;}
.main-nav a{
  padding:9px 16px;border-radius:8px;font-size:15px;font-weight:500;color:var(--ink);
  transition:color .15s,background .15s;
}
.main-nav a:hover{color:var(--blue-600);}
.main-nav a.active{color:#fff;background:var(--navy-800);}
.nav-cta{display:none;}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:44px;height:44px;align-items:center;justify-content:center;}
.nav-toggle svg{width:26px;height:26px;stroke:var(--navy-800);}

/* ============================================================
   视图基础
   ============================================================ */
.view{display:none;}
.view.active{display:block;}
.page-hero{
  background:linear-gradient(135deg,var(--navy-900),var(--blue-600));
  color:#fff;padding:84px 0;
}
.page-hero h1{font-size:clamp(28px,4.6vw,44px);font-weight:900;}
.page-hero .crumb{margin-top:12px;color:rgba(255,255,255,.78);font-size:14px;}
.page-hero .crumb b{color:#fff;font-weight:500;}

/* ============================================================
   首页
   ============================================================ */
.home-hero{position:relative;color:#fff;overflow:hidden;}
.home-hero .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;}
.home-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(8,26,51,.86) 0%,rgba(11,36,80,.62) 46%,rgba(11,36,80,.28) 100%);}
.home-hero .hero-inner{position:relative;z-index:2;max-width:var(--container);margin:0 auto;padding:96px 24px 110px;}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:13px;letter-spacing:1px;color:rgba(255,255,255,.82);
  border:1px solid rgba(255,255,255,.3);padding:6px 14px;border-radius:999px;
}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--red-600);}
.home-hero h1{
  font-size:clamp(30px,5.4vw,54px);font-weight:900;
  margin:22px 0 18px;max-width:760px;letter-spacing:.5px;
}
.home-hero .lead{font-size:clamp(15px,1.8vw,19px);color:rgba(255,255,255,.9);max-width:640px;}
.home-hero .actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:34px;}

.section{padding:84px 0;}
.section-alt{background:var(--bg-soft);}
.section-head{max-width:760px;margin-bottom:44px;}
.section-kicker{color:var(--red-600);font-weight:700;font-size:14px;letter-spacing:1.5px;display:flex;align-items:center;gap:8px;}
.section-kicker::before{content:"";width:22px;height:2px;background:var(--red-600);}
.section-head h2{font-size:clamp(26px,3.6vw,38px);font-weight:900;color:var(--navy-800);margin-top:12px;}
.section-head p{color:var(--muted);margin-top:14px;font-size:16px;}

/* 首页产品卡片 */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.product-card{
  background:#fff;border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--line);box-shadow:var(--shadow-1);
  transition:transform .2s ease,box-shadow .2s ease;display:flex;flex-direction:column;
}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-2);}
.product-card .thumb{height:200px;overflow:hidden;background:var(--bg-soft);}
.product-card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease;}
.product-card:hover .thumb img{transform:scale(1.05);}
.product-card .body{padding:22px;display:flex;flex-direction:column;flex:1;}
.product-card .body h3{font-size:20px;font-weight:700;color:var(--navy-800);}
.product-card .body .en{font-size:13px;color:var(--muted);margin-top:2px;}
.product-card .body p{color:var(--muted);font-size:14px;margin-top:10px;flex:1;}
.product-card .go{
  margin-top:16px;display:inline-flex;align-items:center;gap:6px;
  color:var(--blue-600);font-weight:600;font-size:14px;
}
.product-card .go svg{width:16px;height:16px;transition:transform .2s;}
.product-card:hover .go svg{transform:translateX(4px);}

/* 关于我们条 */
.about-strip{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:center;}
.about-strip .media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-2);}
.about-strip .media img{width:100%;height:100%;object-fit:cover;min-height:340px;}
.about-strip .kicker{color:var(--red-600);font-weight:700;font-size:14px;letter-spacing:1.5px;}
.about-strip h2{font-size:clamp(24px,3.2vw,34px);font-weight:900;color:var(--navy-800);margin:12px 0 18px;}
.about-strip p{color:var(--muted);font-size:16px;margin-bottom:12px;}
.about-strip .btn{margin-top:16px;}

/* 价值条目 */
.values-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.value-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-1);}
.value-item .ico{
  width:52px;height:52px;border-radius:12px;background:var(--bg-soft);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;color:var(--blue-600);
}
.value-item .ico svg{width:26px;height:26px;}
.value-item h3{font-size:18px;font-weight:700;color:var(--navy-800);}
.value-item p{color:var(--muted);font-size:14px;margin-top:8px;}

/* 联系 CTA 带 */
.cta-band{background:linear-gradient(120deg,var(--navy-900),var(--blue-600));color:#fff;}
.cta-band .inner{max-width:var(--container);margin:0 auto;padding:70px 24px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;}
.cta-band h2{font-size:clamp(22px,3vw,30px);font-weight:900;}
.cta-band p{color:rgba(255,255,255,.85);margin-top:10px;font-size:15px;}
.cta-band .actions{display:flex;gap:16px;flex-wrap:wrap;}

/* ============================================================
   产品中心
   ============================================================ */
.prod-group{margin-bottom:64px;}
.prod-group:last-child{margin-bottom:0;}
.prod-group .ghead{display:flex;align-items:baseline;gap:14px;margin-bottom:22px;}
.prod-group .ghead h3{font-size:24px;font-weight:900;color:var(--navy-800);}
.prod-group .ghead span{color:var(--muted);font-size:14px;}
.prod-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.prod-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow-1);transition:transform .2s,box-shadow .2s;display:flex;flex-direction:column;
}
.prod-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-2);}
.prod-card .thumb{height:210px;background:var(--bg-soft);overflow:hidden;}
.prod-card .thumb img{width:100%;height:100%;object-fit:cover;}
.prod-card .body{padding:22px;display:flex;flex-direction:column;flex:1;}
.prod-card .body h4{font-size:19px;font-weight:700;color:var(--navy-800);}
.prod-card .body .en{font-size:12px;color:var(--muted);}
.prod-card .body p.desc{color:var(--muted);font-size:14px;margin:10px 0 14px;}
.prod-card .specs{border-top:1px dashed var(--line);padding-top:14px;margin-bottom:18px;}
.prod-card .specs li{font-size:13px;color:var(--ink);display:flex;gap:8px;align-items:center;padding:5px 0;}
.prod-card .specs li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--blue-500);flex:none;}
.prod-card .btn{margin-top:auto;width:100%;}
.notice{margin-top:40px;background:#fff8EC;border:1px solid #f3d8a5;color:#8a5a12;padding:16px 20px;border-radius:10px;font-size:14px;}

/* ============================================================
   关于我们
   ============================================================ */
.about-intro{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:center;}
.about-intro .media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-2);}
.about-intro .media img{width:100%;height:100%;object-fit:cover;min-height:320px;}
.about-intro h2{font-size:clamp(24px,3.2vw,34px);font-weight:900;color:var(--navy-800);margin-bottom:18px;}
.about-intro p{color:var(--muted);font-size:16px;margin-bottom:12px;}
.mission-band{background:var(--navy-800);color:#fff;}
.mission-band .inner{max-width:var(--container);margin:0 auto;padding:60px 24px;text-align:center;}
.mission-band h2{font-size:clamp(22px,3vw,30px);font-weight:900;}
.mission-band p{color:rgba(255,255,255,.86);max-width:760px;margin:14px auto 0;font-size:16px;}

/* 业务方向 */
.flow-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.flow-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-1);}
.flow-card .ico{width:54px;height:54px;border-radius:12px;background:var(--bg-soft);display:flex;align-items:center;justify-content:center;color:var(--blue-600);margin-bottom:18px;}
.flow-card .ico svg{width:27px;height:27px;}
.flow-card h3{font-size:20px;font-weight:700;color:var(--navy-800);}
.flow-card .en{font-size:13px;color:var(--muted);}
.flow-card p{color:var(--muted);font-size:14px;margin-top:10px;}
.flow-card ul{margin-top:12px;display:flex;flex-direction:column;gap:8px;}
.flow-card ul li{font-size:14px;color:var(--ink);display:flex;gap:8px;}
.flow-card ul li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--red-600);flex:none;margin-top:8px;}

/* ============================================================
   联系我们
   ============================================================ */
.contact-grid{display:grid;grid-template-columns:1fr 1.3fr;gap:48px;}
.contact-info .ci{display:flex;gap:18px;align-items:flex-start;padding:22px 0;border-bottom:1px solid var(--line);}
.contact-info .ci:last-child{border-bottom:0;}
.contact-info .ci .ico{width:50px;height:50px;border-radius:12px;background:var(--bg-soft);display:flex;align-items:center;justify-content:center;color:var(--blue-600);flex:none;}
.contact-info .ci .ico svg{width:24px;height:24px;}
.contact-info .ci .lbl{font-size:13px;color:var(--muted);}
.contact-info .ci .val{font-size:18px;font-weight:700;color:var(--navy-800);margin-top:2px;}
.contact-info .ci .val.small{font-size:15px;font-weight:500;color:var(--ink);}

.contact-form{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-1);padding:34px;
}
.contact-form h3{font-size:22px;font-weight:900;color:var(--navy-800);margin-bottom:22px;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.field{margin-bottom:18px;}
.field label{display:block;font-size:14px;font-weight:600;color:var(--ink);margin-bottom:8px;}
.field input,.field textarea,.field select{
  width:100%;min-height:48px;padding:12px 14px;border:1px solid var(--line);border-radius:10px;
  font-size:15px;font-family:inherit;color:var(--ink);background:#fff;transition:border-color .15s;
}
.field textarea{min-height:130px;resize:vertical;}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--blue-500);outline:none;}
.contact-form .btn{width:100%;margin-top:6px;}
.form-ok{display:none;margin-top:16px;padding:14px 18px;background:#E9F6EC;color:#1E7A3C;border:1px solid #BDE6C7;border-radius:10px;font-size:14px;}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{background:var(--navy-900);color:rgba(255,255,255,.72);}
.footer-inner{max-width:var(--container);margin:0 auto;padding:56px 24px 30px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;}
.footer-inner h4{color:#fff;font-size:16px;font-weight:700;margin-bottom:16px;}
.footer-brand .brand{color:#fff;}
.footer-brand .brand-name{color:#fff;}
.footer-brand p{font-size:14px;margin-top:16px;max-width:340px;}
.footer-links a{display:block;color:rgba(255,255,255,.72);font-size:14px;padding:6px 0;transition:color .15s;}
.footer-links a:hover{color:#fff;}
.footer-contact p{font-size:14px;margin-bottom:10px;}
.footer-contact b{color:#fff;font-weight:600;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14);padding:20px 24px;text-align:center;font-size:13px;color:rgba(255,255,255,.5);}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:960px){
  .card-grid,.prod-cards{grid-template-columns:repeat(2,1fr);}
  .values-grid{grid-template-columns:repeat(2,1fr);}
  .about-strip,.about-intro,.contact-grid,.network-strip,.partner-wrap{grid-template-columns:1fr;gap:28px;}
  .about-strip .media img,.about-intro .media img,.network-strip .media img{min-height:240px;}
  .flow-cards{grid-template-columns:1fr;}
  .coverage-cols{grid-template-columns:1fr;}
  .footer-inner{grid-template-columns:1fr 1fr;}
  .nav-toggle{display:flex;}
  .main-nav{
    position:absolute;top:72px;left:0;right:0;background:#fff;
    flex-direction:column;align-items:stretch;gap:2px;padding:14px;
    border-bottom:1px solid var(--line);box-shadow:var(--shadow-2);
    display:none;
  }
  .main-nav.open{display:flex;}
  .main-nav a{padding:14px 16px;font-size:16px;}
  .main-nav a.active{background:var(--bg-soft);color:var(--navy-800);}
  .nav-cta{display:flex;}
}
@media (max-width:600px){
  .card-grid,.prod-cards,.values-grid,.form-row{grid-template-columns:1fr;}
  .section{padding:60px 0;}
  .home-hero .hero-inner{padding:72px 20px 84px;}
  .cta-band .inner{flex-direction:column;align-items:flex-start;padding:56px 20px;}
  .footer-inner{grid-template-columns:1fr;gap:28px;}
}

/* ============================================================
   产品卡片 · 主要型号列表
   ============================================================ */
.models{margin:6px 0 14px;border-top:1px dashed var(--line);padding-top:12px;}
.models-head{font-size:12px;color:var(--muted);letter-spacing:1px;margin-bottom:8px;}
.model{padding:9px 0;border-bottom:1px solid var(--line);}
.model:last-child{border-bottom:0;}
.model b{display:block;font-size:14px;font-weight:700;color:var(--navy-800);}
.model span{display:block;font-size:12.5px;color:var(--muted);margin-top:3px;line-height:1.5;}

/* ============================================================
   服务网络 / 合作客户
   ============================================================ */
.network-strip{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:center;}
.network-strip .media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-2);}
.network-strip .media img{width:100%;height:100%;object-fit:cover;min-height:340px;}
.network-strip .kicker{color:var(--red-600);font-weight:700;font-size:14px;letter-spacing:1.5px;}
.network-strip h2{font-size:clamp(24px,3.2vw,34px);font-weight:900;color:var(--navy-800);margin:12px 0 18px;}
.network-strip p{color:var(--muted);font-size:15px;margin-bottom:10px;}
.coverage{margin:6px 0 22px;display:flex;flex-direction:column;gap:8px;}
.coverage li{font-size:15px;font-weight:600;color:var(--ink);display:flex;gap:9px;align-items:center;}
.coverage li::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--red-600);flex:none;}
.coverage-cols{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:6px;}
.coverage-cols h4{font-size:15px;font-weight:700;color:var(--navy-800);margin-bottom:6px;}
.coverage-cols p{font-size:13.5px;color:var(--muted);margin:0;}

.partner-wrap{display:grid;grid-template-columns:0.9fr 1.2fr;gap:40px;align-items:stretch;}
.partner-media{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-2);min-height:300px;}
.partner-media img{width:100%;height:100%;object-fit:cover;}
.partner-chips{display:flex;flex-wrap:wrap;align-content:flex-start;gap:12px;}
.partner-chips span{
  background:#fff;border:1px solid var(--line);border-radius:999px;
  padding:10px 18px;font-size:14px;color:var(--navy-800);font-weight:500;
  box-shadow:var(--shadow-1);
}

/* 减少动效偏好 */
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
  html{scroll-behavior:auto;}
  .product-card:hover,.prod-card:hover{transform:none;}
}

/* ============================================================
   产品中心 · 两大类分组标题
   ============================================================ */
.cat-head{display:flex;gap:22px;align-items:flex-start;margin-bottom:34px;}
.cat-head-gap{margin-top:76px;}
.cat-no{
  flex:none;font-size:46px;font-weight:900;line-height:1;color:var(--navy-800);
  letter-spacing:-1px;position:relative;padding-right:20px;
}
.cat-no::after{content:"";position:absolute;right:0;top:4px;bottom:4px;width:2px;background:var(--red-600);}
.cat-copy h2{font-size:clamp(24px,3.2vw,34px);font-weight:900;color:var(--navy-800);margin-top:10px;}
.cat-copy p{color:var(--muted);font-size:15.5px;margin-top:12px;max-width:720px;}

/* ============================================================
   产品中心 · 第二类：工业滤芯卡片（横向版式）
   ============================================================ */
.filter-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.filter-card{
  display:flex;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow-1);
  transition:transform .2s ease,box-shadow .2s ease;
}
.filter-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-2);}
.filter-card .fthumb{
  flex:none;width:176px;background:#E7E6E2;overflow:hidden;
  border-right:1px solid var(--line);display:flex;align-items:center;justify-content:center;
}
.filter-card .fthumb img{width:100%;height:100%;object-fit:contain;padding:10px;}
.filter-card .fbody{padding:24px;display:flex;flex-direction:column;flex:1;min-width:0;}
.filter-card .fbody h4{font-size:18px;font-weight:700;color:var(--navy-800);line-height:1.35;}
.filter-card .fbody .en{font-size:12px;color:var(--muted);margin-top:3px;letter-spacing:.5px;text-transform:uppercase;}
.filter-card .fbody .medium{
  display:inline-block;margin-top:10px;width:fit-content;
  font-size:12.5px;color:var(--blue-600);background:#EEF4FD;border:1px solid #D7E5F8;
  border-radius:6px;padding:4px 10px;line-height:1.5;
}
.filter-card .fbody p{color:var(--muted);font-size:13.5px;margin:12px 0 14px;line-height:1.7;}
.filter-card .specs{padding-top:12px;border-top:1px dashed var(--line);margin-bottom:18px;}
.filter-card .specs li{font-size:13px;color:var(--ink);display:flex;gap:8px;padding:4px 0;line-height:1.6;}
.filter-card .specs li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--blue-500);flex:none;margin-top:7px;}
.filter-card .btn{margin-top:auto;width:fit-content;min-height:40px;padding:0 20px;font-size:14px;}

/* 滤芯通用材料结构说明 */
.filter-note{
  margin-top:34px;background:#fff;border:1px solid var(--line);border-left:4px solid var(--blue-600);
  border-radius:10px;padding:22px 26px;box-shadow:var(--shadow-1);
}
.filter-note h4{font-size:16px;font-weight:700;color:var(--navy-800);margin-bottom:10px;}
.filter-note p{font-size:13.5px;color:var(--muted);line-height:1.85;margin-bottom:8px;}
.filter-note p:last-child{margin-bottom:0;}
.filter-note b{color:var(--navy-800);font-weight:600;}

@media (max-width:960px){
  .filter-cards{grid-template-columns:1fr;}
  .cat-head{gap:16px;}
  .cat-no{font-size:36px;padding-right:14px;}
}
@media (max-width:600px){
  .filter-card{flex-direction:column;}
  .filter-card .fthumb{width:100%;height:200px;border-right:0;border-bottom:1px solid var(--line);}
  .filter-note{padding:18px 20px;}
  .cat-no{font-size:28px;padding-right:12px;}
}