/* ============================================================
   恒玮气体 企业官网模板样式  template/hengwei
   主色：深蓝 #0E5AA7  深蓝加深 #083B70  强调色：#F26522
   纯手写 CSS，零外部依赖，PC + 移动端自适应
   ============================================================ */
:root{
  --primary:#0E5AA7;
  --primary-dark:#083B70;
  --primary-deep:#062B52;
  --accent:#F26522;
  --text:#333;
  --text-light:#777;
  --bg-gray:#F5F7FA;
  --line:#E5E9F0;
  --white:#fff;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Roboto,sans-serif;color:var(--text);font-size:15px;line-height:1.7;background:var(--white);}
a{color:inherit;text-decoration:none;transition:color .2s;}
a:hover{color:var(--primary);}
ul,ol{list-style:none;}
img{max-width:100%;border:0;vertical-align:middle;}
input,textarea,button,select{font-family:inherit;font-size:16px;outline:none;}
.container{max-width:1200px;margin:0 auto;padding:0 16px;}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--primary-deep);color:#cfe0f2;font-size:13px;}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:36px;}
.topbar a{color:#fff;}
.topbar a:hover{color:#ffd9c4;}

/* ---------- 头部导航 ---------- */
.header{position:sticky;top:0;left:0;right:0;background:var(--white);box-shadow:0 2px 10px rgba(10,40,80,.08);z-index:999;}
.header .container{display:flex;align-items:center;justify-content:space-between;height:70px;}
.logo{display:flex;align-items:center;gap:10px;}
.logo svg{height:44px;width:auto;}
.nav{display:flex;align-items:center;}
.nav>li{position:relative;}
.nav>li>a{display:block;padding:8px 18px;font-size:16px;color:#222;line-height:54px;}
.nav>li>a:hover,.nav>li.active>a{color:var(--primary);font-weight:600;}
.nav>li.active>a::after{content:"";position:absolute;left:18px;right:18px;bottom:8px;height:3px;background:var(--primary);border-radius:2px;}
.nav .subnav{position:absolute;top:100%;left:0;min-width:150px;background:var(--white);box-shadow:0 6px 18px rgba(10,40,80,.15);border-radius:0 0 6px 6px;opacity:0;visibility:hidden;transform:translateY(8px);transition:.25s;z-index:99;}
.nav>li:hover .subnav{opacity:1;visibility:visible;transform:translateY(0);}
.nav .subnav a{display:block;padding:10px 16px;font-size:14px;color:#444;border-bottom:1px solid var(--line);}
.nav .subnav a:hover{background:var(--bg-gray);color:var(--primary);}
.header-phone{display:flex;align-items:center;gap:8px;color:var(--primary);font-weight:700;font-size:17px;margin-left:16px;white-space:nowrap;}
.header-phone svg{width:20px;height:20px;fill:var(--accent);}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px;}
.nav-toggle span{display:block;width:24px;height:3px;background:var(--primary);margin:5px 0;border-radius:2px;transition:.3s;}

/* ---------- Banner 轮播 ---------- */
.banner{position:relative;overflow:hidden;height:460px;background:var(--primary-deep);}
.banner .slide{position:absolute;inset:0;opacity:0;transition:opacity 1s;}
.banner .slide.on{opacity:1;}
.banner .slide img{width:100%;height:100%;object-fit:cover;}
.banner .slide::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,43,82,.78) 0%,rgba(6,43,82,.35) 55%,rgba(6,43,82,.1) 100%);}
.banner .slide-txt{position:absolute;z-index:2;top:50%;left:0;right:0;transform:translateY(-50%);color:#fff;}
.banner .slide-txt h2{font-size:40px;letter-spacing:2px;text-shadow:0 2px 8px rgba(0,0,0,.35);}
.banner .slide-txt p{font-size:18px;margin-top:12px;opacity:.92;letter-spacing:1px;}
.banner .btn-cta{display:inline-block;margin-top:28px;padding:12px 34px;background:var(--accent);color:#fff;border-radius:4px;font-size:16px;letter-spacing:1px;box-shadow:0 6px 16px rgba(242,101,34,.4);}
.banner .btn-cta:hover{background:#e05614;color:#fff;}
.banner .dots{position:absolute;bottom:18px;left:0;right:0;display:flex;justify-content:center;gap:10px;z-index:3;}
.banner .dots i{width:28px;height:5px;background:rgba(255,255,255,.4);border-radius:3px;cursor:pointer;transition:.3s;}
.banner .dots i.on{background:#fff;}

/* ---------- 通用区块 ---------- */
.section{padding:70px 0;}
.section.gray{background:var(--bg-gray);}
.sec-head{text-align:center;margin-bottom:44px;}
.sec-head h2{font-size:30px;color:var(--text);letter-spacing:2px;}
.sec-head h2 em{color:var(--primary);font-style:normal;}
.sec-head .en{font-size:13px;color:#9aa7b5;text-transform:uppercase;letter-spacing:3px;margin-top:6px;}
.sec-head .bar{width:46px;height:4px;background:var(--primary);border-radius:2px;margin:14px auto 0;}
.sec-head.left{text-align:left;}
.sec-head.left .bar{margin-left:0;}

/* ---------- 首页分类卡 ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.cat-card{position:relative;height:200px;border-radius:8px;overflow:hidden;display:block;}
.cat-card img{width:100%;height:100%;object-fit:cover;transition:transform .5s;}
.cat-card:hover img{transform:scale(1.08);}
.cat-card .mask{position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,43,82,.1) 30%,rgba(6,43,82,.85) 100%);}
.cat-card .txt{position:absolute;left:0;right:0;bottom:0;padding:16px 18px;color:#fff;}
.cat-card .txt h3{font-size:19px;letter-spacing:1px;}
.cat-card .txt span{font-size:12px;opacity:.75;letter-spacing:1px;text-transform:uppercase;}
.cat-card .more{position:absolute;top:12px;right:14px;width:30px;height:30px;border-radius:50%;background:rgba(255,255,255,.22);color:#fff;text-align:center;line-height:30px;font-size:16px;opacity:0;transition:.3s;}
.cat-card:hover .more{opacity:1;}

/* ---------- 产品网格 ---------- */
.prod-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.prod-card{background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden;transition:.3s;display:block;}
.prod-card:hover{box-shadow:0 10px 26px rgba(14,90,167,.15);transform:translateY(-4px);border-color:transparent;}
.prod-card .img{height:200px;overflow:hidden;background:#eef2f7;}
.prod-card .img img{width:100%;height:100%;object-fit:cover;transition:transform .5s;}
.prod-card:hover .img img{transform:scale(1.06);}
.prod-card .body{padding:14px 16px 16px;}
.prod-card .body h3{font-size:15.5px;font-weight:600;color:#222;line-height:1.45;height:44px;overflow:hidden;}
.prod-card:hover .body h3{color:var(--primary);}
.prod-card .body p{font-size:13px;color:var(--text-light);margin-top:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.center-btn{text-align:center;margin-top:40px;}
.btn-more{display:inline-block;padding:11px 40px;border:1px solid var(--primary);color:var(--primary);border-radius:4px;font-size:15px;letter-spacing:2px;transition:.3s;background:#fff;}
.btn-more:hover{background:var(--primary);color:#fff;}
.btn-more.solid{background:var(--primary);color:#fff;}
.btn-more.solid:hover{background:var(--primary-dark);}

/* ---------- 首页关于我们 ---------- */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;}
.about-grid .pic{border-radius:8px;overflow:hidden;box-shadow:0 12px 30px rgba(6,43,82,.18);position:relative;}
.about-grid .pic img{width:100%;height:340px;object-fit:cover;display:block;}
.about-grid .exp{position:absolute;right:0;bottom:0;background:var(--accent);color:#fff;padding:12px 20px;font-size:14px;}
.about-grid .exp b{display:block;font-size:26px;}
.about-txt h2{font-size:28px;letter-spacing:1px;}
.about-txt h2 em{color:var(--primary);font-style:normal;}
.about-txt .en{font-size:12px;color:#9aa7b5;letter-spacing:3px;margin:4px 0 18px;text-transform:uppercase;}
.about-txt p{color:#555;text-align:justify;margin-bottom:12px;}
.about-feats{display:grid;grid-template-columns:repeat(2,1fr);gap:10px 18px;margin-top:18px;}
.about-feats li{position:relative;padding-left:22px;font-size:14px;color:#444;}
.about-feats li::before{content:"";position:absolute;left:0;top:8px;width:10px;height:10px;background:var(--primary);border-radius:2px;transform:rotate(45deg);}

/* ---------- 优势 ---------- */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.adv-item{background:#fff;border-radius:8px;padding:30px 22px;text-align:center;border:1px solid var(--line);transition:.3s;}
.adv-item:hover{box-shadow:0 10px 26px rgba(14,90,167,.12);transform:translateY(-4px);}
.adv-item .ic{width:64px;height:64px;margin:0 auto 16px;border-radius:50%;background:linear-gradient(135deg,#e8f1fb,#d3e5f8);display:flex;align-items:center;justify-content:center;}
.adv-item .ic svg{width:32px;height:32px;fill:var(--primary);}
.adv-item h3{font-size:17px;margin-bottom:8px;}
.adv-item p{font-size:13.5px;color:var(--text-light);}

/* ---------- CTA 横条 ---------- */
.cta-band{background:linear-gradient(100deg,var(--primary-deep) 0%,var(--primary) 70%,#1771c9 100%);color:#fff;padding:44px 0;}
.cta-band .container{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;}
.cta-band h3{font-size:24px;letter-spacing:1px;}
.cta-band p{opacity:.85;margin-top:4px;font-size:14px;}
.cta-band .tel{font-size:30px;font-weight:800;letter-spacing:1px;display:flex;align-items:center;gap:12px;}
.cta-band .tel svg{width:34px;height:34px;fill:var(--accent);}
.cta-band .btn-w{display:inline-block;padding:11px 30px;border:1px solid rgba(255,255,255,.7);border-radius:4px;font-size:15px;transition:.3s;}
.cta-band .btn-w:hover{background:#fff;color:var(--primary);}

/* ---------- 新闻 ---------- */
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.news-item{display:flex;gap:18px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:16px;transition:.3s;}
.news-item:hover{box-shadow:0 10px 26px rgba(14,90,167,.12);transform:translateY(-3px);}
.news-item .date{flex-shrink:0;width:76px;text-align:center;background:var(--bg-gray);border-radius:6px;padding:10px 0;}
.news-item .date b{display:block;font-size:26px;color:var(--primary);line-height:1.2;}
.news-item .date span{font-size:12px;color:var(--text-light);}
.news-item h3{font-size:16px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.news-item:hover h3{color:var(--primary);}
.news-item p{font-size:13px;color:var(--text-light);margin-top:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}

/* ---------- 内页 banner ---------- */
.page-banner{background:linear-gradient(100deg,var(--primary-deep),var(--primary));color:#fff;padding:52px 0;}
.page-banner h1{font-size:28px;letter-spacing:2px;}
.page-banner p{opacity:.8;font-size:14px;margin-top:6px;}
.breadcrumb{font-size:13px;color:#8b98a8;margin:18px 0 0;}
.breadcrumb a{color:var(--text-light);}
.breadcrumb a:hover{color:var(--primary);}

/* ---------- 单页内容 ---------- */
.page-wrap{display:grid;grid-template-columns:250px 1fr;gap:34px;padding:44px 0 70px;}
.side-box{background:var(--bg-gray);border-radius:8px;overflow:hidden;align-self:start;}
.side-box .hd{background:var(--primary);color:#fff;padding:14px 18px;font-size:17px;letter-spacing:1px;}
.side-box ul{padding:8px 0;}
.side-box ul li a{display:block;padding:11px 18px;font-size:14.5px;color:#444;border-left:3px solid transparent;transition:.2s;}
.side-box ul li a:hover,.side-box ul li a.on{background:#fff;color:var(--primary);border-left-color:var(--accent);}
.side-contact{background:var(--primary-deep);color:#cfe0f2;border-radius:8px;padding:20px;margin-top:20px;font-size:13.5px;}
.side-contact h4{color:#fff;font-size:16px;margin-bottom:10px;}
.side-contact li{margin-top:8px;word-break:break-all;}
.content-body{min-width:0;}
.content-body h2.title{font-size:24px;padding-bottom:14px;border-bottom:2px solid var(--line);margin-bottom:24px;}
.rich{color:#444;font-size:15px;}
.rich p{margin-bottom:14px;text-align:justify;}
.rich img{max-width:100%;height:auto;border-radius:6px;margin:6px 0;}
.rich h3{font-size:18px;margin:20px 0 10px;color:var(--primary-dark);}

/* ---------- 产品分类 tabs ---------- */
.cat-tabs{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:30px;}
.cat-tabs a{display:block;padding:9px 22px;background:var(--bg-gray);border-radius:4px;font-size:14.5px;color:#444;border:1px solid var(--line);transition:.25s;}
.cat-tabs a:hover{color:var(--primary);border-color:var(--primary);}
.cat-tabs a.on{background:var(--primary);color:#fff;border-color:var(--primary);}

/* ---------- 产品详情 ---------- */
.prod-detail{display:grid;grid-template-columns:1fr 1fr;gap:36px;padding:44px 0;}
.prod-detail .pic{border:1px solid var(--line);border-radius:8px;overflow:hidden;}
.prod-detail .pic img{width:100%;height:400px;object-fit:cover;display:block;}
.prod-detail h1{font-size:24px;margin-bottom:10px;}
.prod-detail .desc{color:var(--text-light);font-size:14.5px;padding-bottom:18px;border-bottom:1px dashed var(--line);margin-bottom:18px;}
.prod-detail .inquiry{display:inline-block;padding:12px 36px;background:var(--accent);color:#fff;border-radius:4px;font-size:15px;letter-spacing:1px;box-shadow:0 6px 14px rgba(242,101,34,.35);}
.prod-detail .inquiry:hover{background:#e05614;color:#fff;}
.prod-detail .tel-tip{margin-top:14px;font-size:14px;color:var(--text-light);}
.prod-detail .tel-tip b{color:var(--primary);font-size:18px;}

/* ---------- 分页 ---------- */
.pager{display:flex;justify-content:center;gap:8px;margin:40px 0 10px;flex-wrap:wrap;}
.pager a,.pager span{display:block;padding:8px 16px;border:1px solid var(--line);border-radius:4px;font-size:14px;color:#555;background:#fff;}
.pager span{background:var(--primary);color:#fff;border-color:var(--primary);}
.pager a:hover{border-color:var(--primary);color:var(--primary);}

/* ---------- 留言表单 ---------- */
.msg-wrap{display:grid;grid-template-columns:1fr 380px;gap:36px;padding:44px 0 70px;align-items:start;}
.msg-form{background:#fff;border:1px solid var(--line);border-radius:8px;padding:30px;}
.msg-form h3{font-size:20px;margin-bottom:20px;padding-left:10px;border-left:4px solid var(--primary);}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.form-item{margin-bottom:18px;}
.form-item label{display:block;font-size:14px;color:#444;margin-bottom:7px;}
.form-item label i{color:#e74c3c;font-style:normal;margin-right:3px;}
.form-item input,.form-item textarea{width:100%;border:1px solid #d6dde6;border-radius:4px;padding:11px 13px;transition:.2s;background:#fbfcfe;}
.form-item input:focus,.form-item textarea:focus{border-color:var(--primary);background:#fff;box-shadow:0 0 0 3px rgba(14,90,167,.1);}
.form-item textarea{height:120px;resize:vertical;}
.code-row{display:flex;gap:12px;align-items:center;}
.code-row img{height:44px;border-radius:4px;cursor:pointer;}
.btn-submit{display:inline-block;padding:13px 46px;background:var(--primary);color:#fff;border:0;border-radius:4px;font-size:16px;letter-spacing:2px;cursor:pointer;transition:.3s;}
.btn-submit:hover{background:var(--primary-dark);}
.msg-side .card{background:var(--bg-gray);border-radius:8px;padding:24px;margin-bottom:20px;}
.msg-side .card h4{font-size:16px;margin-bottom:12px;color:var(--primary-dark);}
.msg-side .card li{font-size:14px;color:#555;margin-top:8px;word-break:break-all;}

/* ---------- 页脚 ---------- */
.footer{background:var(--primary-deep);color:#9fb6cd;padding:56px 0 0;font-size:14px;}
.footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:40px;}
.footer h4{color:#fff;font-size:17px;margin-bottom:16px;letter-spacing:1px;}
.footer li{margin-top:9px;line-height:1.6;}
.footer a:hover{color:#fff;}
.footer .tel-big{color:#fff;font-size:22px;font-weight:700;}
.footer .qr{width:120px;height:120px;background:#fff;border-radius:6px;display:flex;align-items:center;justify-content:center;color:#9aa7b5;font-size:12px;text-align:center;}
.copyright{border-top:1px solid rgba(255,255,255,.12);padding:16px 0;text-align:center;font-size:13px;color:#7d94ab;}

/* ---------- 移动端底部栏 & 悬浮 ---------- */
.m-footbar{display:none;}
.backtop{position:fixed;right:18px;bottom:90px;width:44px;height:44px;border-radius:6px;background:var(--primary);color:#fff;text-align:center;line-height:44px;cursor:pointer;opacity:0;visibility:hidden;transition:.3s;z-index:99;box-shadow:0 4px 12px rgba(6,43,82,.35);}
.backtop.show{opacity:1;visibility:visible;}

/* ============================================================
   移动端适配  < 860px
   ============================================================ */
@media (max-width:860px){
  .topbar .welcome{display:none;}
  .topbar .container{justify-content:flex-end;}
  .header{position:relative;}
  .header .container{height:60px;}
  .logo svg{height:36px;}
  .header-phone{display:none;}
  .nav-toggle{display:block;}
  .nav{display:none;position:absolute;top:60px;left:0;right:0;background:#fff;flex-direction:column;align-items:stretch;box-shadow:0 12px 24px rgba(10,40,80,.15);max-height:70vh;overflow-y:auto;}
  .nav.open{display:flex;}
  .nav>li>a{line-height:normal;padding:13px 22px;border-bottom:1px solid var(--line);font-size:15px;}
  .nav>li.active>a::after{display:none;}
  .nav .subnav{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;display:none;padding-left:14px;background:var(--bg-gray);}
  .nav>li:hover .subnav{display:block;}
  .nav .subnav a{border-bottom:0;padding:9px 18px;}

  .banner{height:300px;}
  .banner .slide-txt h2{font-size:24px;}
  .banner .slide-txt p{font-size:14px;margin-top:8px;}
  .banner .btn-cta{margin-top:16px;padding:9px 24px;font-size:14px;}

  .section{padding:44px 0;}
  .sec-head{margin-bottom:28px;}
  .sec-head h2{font-size:22px;}
  .cat-grid{grid-template-columns:repeat(2,1fr);gap:12px;}
  .cat-card{height:130px;}
  .cat-card .txt{padding:10px 12px;}
  .cat-card .txt h3{font-size:15px;}
  .prod-grid{grid-template-columns:repeat(2,1fr);gap:12px;}
  .prod-card .img{height:140px;}
  .prod-card .body{padding:10px 12px 12px;}
  .prod-card .body h3{font-size:14px;height:auto;max-height:40px;}
  .prod-card .body p{display:none;}
  .about-grid{grid-template-columns:1fr;gap:24px;}
  .about-grid .pic img{height:220px;}
  .about-txt h2{font-size:21px;}
  .adv-grid{grid-template-columns:repeat(2,1fr);gap:12px;}
  .adv-item{padding:20px 14px;}
  .news-grid{grid-template-columns:1fr;gap:14px;}
  .cta-band .container{flex-direction:column;text-align:center;gap:14px;}
  .cta-band h3{font-size:19px;}
  .cta-band .tel{font-size:23px;}
  .page-banner{padding:34px 0;}
  .page-banner h1{font-size:21px;}
  .page-wrap{grid-template-columns:1fr;gap:20px;padding:24px 0 44px;}
  .prod-detail{grid-template-columns:1fr;gap:20px;padding:24px 0;}
  .prod-detail .pic img{height:260px;}
  .prod-detail h1{font-size:19px;}
  .msg-wrap{grid-template-columns:1fr;padding:24px 0 50px;}
  .msg-form{padding:20px 16px;}
  .form-row{grid-template-columns:1fr;gap:0;}
  .footer .cols{grid-template-columns:1fr 1fr;gap:26px;padding-bottom:26px;}
  .footer .cols .col-full{grid-column:1/-1;}

  .m-footbar{display:block;position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;z-index:98;padding-bottom:env(safe-area-inset-bottom);}
  .m-footbar a{display:flex;align-items:center;justify-content:center;gap:6px;padding:11px 0;font-size:14px;}
  .m-footbar a svg{width:17px;height:17px;fill:currentColor;}
  .m-footbar a.call{background:var(--primary);color:#fff;}
  .m-footbar a.msg{background:var(--accent);color:#fff;}
  body{padding-bottom:44px;}
  .backtop{display:none;}
}
@media (max-width:420px){
  .cat-grid{grid-template-columns:repeat(2,1fr);}
  .adv-grid{grid-template-columns:1fr 1fr;}
}