/* ============================================================
   南博万（南京）安全技术有限公司 官网
   传统企业站 · 深蓝 + 应急橙 配色
   ============================================================ */
:root{
  --navy:#0a3d6b;
  --navy-2:#0e5289;
  --navy-3:#1267a8;
  --navy-deep:#082c4d;
  --orange:#ff6a00;
  --orange-2:#ff8333;
  --text:#2b333b;
  --muted:#6b7785;
  --line:#e5e9ee;
  --bg:#f5f7fa;
  --white:#fff;
  --shadow:0 6px 24px rgba(10,61,107,.10);
  --shadow-h:0 14px 36px rgba(10,61,107,.18);
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Noto Sans SC","Source Han Sans CN",-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
  color:var(--text);
  font-size:15px;
  line-height:1.75;
  background:var(--white);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{text-decoration:none;color:inherit;}
ul{list-style:none;}
h1,h2,h3,h4{font-weight:700;line-height:1.35;}
.container{width:1200px;max-width:calc(100% - 40px);margin:0 auto;}

/* ============ 通用按钮 ============ */
.btn{
  display:inline-block;padding:12px 30px;border-radius:4px;font-size:15px;font-weight:600;
  cursor:pointer;border:1px solid transparent;transition:.25s;letter-spacing:1px;
}
.btn-orange{background:var(--orange);color:#fff;}
.btn-orange:hover{background:var(--orange-2);}
.btn-blue{background:var(--navy);color:#fff;}
.btn-blue:hover{background:var(--navy-2);}
.btn-outline{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.65);}
.btn-outline:hover{background:#fff;color:var(--navy);}

/* ============ 顶部欢迎条 ============ */
.topbar{background:var(--navy-deep);color:#cdd9e6;font-size:13px;}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:38px;}
.welcome::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--orange);margin-right:8px;vertical-align:middle;}
.top-links{display:flex;align-items:center;gap:12px;}
.top-links a{color:#cdd9e6;transition:.2s;}
.top-links a:hover{color:var(--orange-2);}
.top-links em{font-style:normal;color:#3f5a78;}

/* ============ 头部 ============ */
.header{background:var(--white);box-shadow:0 2px 12px rgba(10,61,107,.06);}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:20px 0;}
.logo{display:flex;align-items:center;gap:14px;}
.logo-mark{width:58px;height:58px;flex:none;}
.logo-mark svg{width:100%;height:100%;}
.logo-text{display:flex;flex-direction:column;line-height:1.3;}
.logo-text b{font-size:24px;color:var(--navy);letter-spacing:1px;font-weight:800;}
.logo-text span{font-size:11px;color:var(--muted);letter-spacing:1.5px;}
.header-tel{display:flex;align-items:center;gap:14px;padding:8px 22px;border:1px solid var(--line);border-radius:6px;background:linear-gradient(135deg,#fbfdff,#f1f6fb);}
.tel-icon{width:46px;height:46px;border-radius:50%;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:center;flex:none;}
.tel-icon svg{width:24px;height:24px;}
.tel-text{display:flex;flex-direction:column;line-height:1.25;}
.tel-label{font-size:12px;color:var(--muted);}
.tel-num{font-size:26px;font-weight:800;color:var(--orange);letter-spacing:1px;font-family:"Arial","Microsoft YaHei",sans-serif;}
.tel-who{font-size:12px;color:var(--muted);}

/* ============ 导航栏 ============ */
.navbar{background:var(--navy);position:sticky;top:0;z-index:900;box-shadow:0 4px 14px rgba(8,44,77,.25);}
.nav-inner{position:relative;}
.nav-menu{display:flex;align-items:stretch;}
.nav-menu>li{flex:1;}
.nav-menu>li>a{
  display:flex;align-items:center;justify-content:center;gap:6px;
  height:56px;color:#eaf1f8;font-size:16px;font-weight:500;letter-spacing:2px;
  position:relative;transition:.2s;
}
.nav-menu>li>a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--orange);
  transform:scaleX(0);transition:.25s;
}
.nav-menu>li>a:hover{background:var(--navy-2);color:#fff;}
.nav-menu>li.active>a{background:var(--orange);color:#fff;}
.nav-menu>li.active>a::after{display:none;}
.home-ico{width:18px;height:18px;}
.burger{display:none;position:absolute;right:0;top:50%;transform:translateY(-50%);background:none;border:none;cursor:pointer;padding:8px;}
.burger span{display:block;width:24px;height:2px;background:#fff;margin:5px 0;transition:.3s;}

/* ============ Banner ============ */
.banner{position:relative;height:460px;overflow:hidden;}
.banner-img{position:absolute;inset:0;}
.banner-img img{width:100%;height:100%;object-fit:cover;}
.banner-mask{position:absolute;inset:0;background:linear-gradient(100deg,rgba(8,44,77,.92) 0%,rgba(10,61,107,.72) 45%,rgba(10,61,107,.25) 100%);}
.banner-inner{position:relative;z-index:2;height:100%;display:flex;align-items:center;}
.banner-text{max-width:620px;color:#fff;}
.banner-text h1{font-size:46px;font-weight:800;letter-spacing:2px;line-height:1.25;text-shadow:0 3px 14px rgba(0,0,0,.3);}
.banner-text p{margin:22px 0 30px;font-size:16px;color:#dbe7f2;line-height:1.9;}
.banner-btns{display:flex;gap:16px;}
.banner-btns .btn{padding:13px 38px;font-size:16px;}

/* ============ 快捷数据条 ============ */
.quickbar{background:var(--white);box-shadow:0 6px 20px rgba(10,61,107,.08);position:relative;z-index:5;margin-top:-34px;}
.quick-grid{display:grid;grid-template-columns:repeat(4,1fr);}
.quick-item{padding:26px 20px;text-align:center;border-right:1px solid var(--line);}
.quick-item:last-child{border-right:none;}
.quick-item b{display:block;font-size:34px;color:var(--navy);font-weight:800;line-height:1;}
.quick-item b em{font-style:normal;font-size:15px;color:var(--orange);margin-left:2px;font-weight:700;}
.quick-item span{font-size:14px;color:var(--muted);margin-top:8px;display:block;}

/* ============ 分区标题 ============ */
.section{padding:70px 0;}
.section-gray{background:var(--bg);}
.section-blue{background:linear-gradient(135deg,var(--navy-deep),var(--navy) 60%,var(--navy-2));}
.sec-title{text-align:center;margin-bottom:46px;}
.sec-title strong{display:block;font-size:15px;letter-spacing:5px;color:#a9b6c4;font-weight:600;font-family:"Arial",sans-serif;}
.sec-title h2{font-size:32px;color:var(--navy);margin:8px 0 14px;position:relative;display:inline-block;padding-bottom:18px;}
.sec-title h2::after{content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);width:54px;height:3px;background:var(--orange);}
.sec-title p{font-size:15px;color:var(--muted);margin-top:12px;}
.sec-title.light strong{color:#7fa0c0;}
.sec-title.light h2{color:#fff;}
.sec-title.light p{color:#c4d4e4;}

/* ============ 关于我们 ============ */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:54px;align-items:center;}
.about-text h3{font-size:26px;color:var(--navy);margin-bottom:20px;}
.about-text p{margin-bottom:14px;color:#44515e;}
.about-text strong{color:var(--navy);}
.about-feats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:26px;}
.about-feats li{display:flex;flex-direction:column;align-items:center;gap:8px;padding:16px 6px;background:var(--bg);border-radius:6px;font-size:14px;color:var(--navy);font-weight:600;transition:.25s;}
.about-feats li:hover{background:var(--navy);color:#fff;transform:translateY(-3px);}
.fi{width:30px;height:30px;color:var(--orange);}
.fi svg{width:100%;height:100%;}
.about-feats li:hover .fi{color:var(--orange-2);}
.about-media{position:relative;}
.about-media img{width:100%;height:420px;object-fit:cover;border-radius:8px;box-shadow:var(--shadow);}
.about-badge{position:absolute;left:-22px;bottom:30px;background:var(--orange);color:#fff;padding:18px 26px;border-radius:8px;box-shadow:var(--shadow-h);}
.about-badge b{display:block;font-size:34px;line-height:1;}
.about-badge span{font-size:13px;}

/* ============ 产品搜索 ============ */
.product-search{display:flex;align-items:center;justify-content:space-between;gap:20px;background:#fff;border:1px solid var(--line);border-radius:6px;padding:16px 22px;margin-bottom:24px;flex-wrap:wrap;}
.hot-words{font-size:13px;color:var(--muted);display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center;}
.hot-words span{color:var(--text);}
.hot-words a{color:var(--navy-3);}
.hot-words a:hover{color:var(--orange);}
.search-box{display:flex;width:340px;max-width:100%;}
.search-box input{flex:1;height:42px;border:1px solid var(--line);border-right:none;border-radius:4px 0 0 4px;padding:0 14px;font-size:14px;outline:none;}
.search-box input:focus{border-color:var(--navy-3);}
.search-box button{width:52px;height:42px;background:var(--navy);border:none;border-radius:0 4px 4px 0;color:#fff;cursor:pointer;transition:.2s;display:flex;align-items:center;justify-content:center;}
.search-box button:hover{background:var(--navy-2);}
.search-box button svg{width:22px;height:22px;}

.pfilter{display:flex;justify-content:center;gap:10px;margin-bottom:34px;flex-wrap:wrap;}
.pfilter button{padding:9px 26px;border:1px solid var(--line);background:#fff;border-radius:4px;font-size:15px;cursor:pointer;color:var(--text);transition:.2s;}
.pfilter button:hover{border-color:var(--navy);color:var(--navy);}
.pfilter button.active{background:var(--navy);border-color:var(--navy);color:#fff;}

.pgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.pcard{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 4px 16px rgba(10,61,107,.07);transition:.28s;display:flex;flex-direction:column;}
.pcard:hover{transform:translateY(-6px);box-shadow:var(--shadow-h);}
.pimg{height:220px;overflow:hidden;background:#eef2f6;}
.pimg img{width:100%;height:100%;object-fit:cover;transition:.5s;}
.pcard:hover .pimg img{transform:scale(1.07);}
.pbody{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1;}
.pcode{display:inline-block;align-self:flex-start;font-size:12px;font-weight:700;color:var(--orange);background:#fff3ea;border:1px solid #ffd9c0;border-radius:3px;padding:2px 9px;letter-spacing:.5px;font-family:"Arial",sans-serif;}
.pbody h3{font-size:18px;color:var(--navy);margin:12px 0 10px;}
.pbody p{font-size:13.5px;color:var(--muted);flex:1;}
.pmore{margin-top:14px;color:var(--navy-3);font-size:14px;font-weight:600;}
.pmore .arr{color:var(--orange);}
.pcard:hover .pmore{color:var(--orange);}
.no-result{text-align:center;color:var(--muted);padding:30px 0;}

/* ============ 解决方案 ============ */
.sol-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.sol{background:#fff;border:1px solid var(--line);border-radius:8px;padding:30px 28px;transition:.28s;position:relative;overflow:hidden;}
.sol::before{content:"";position:absolute;top:0;left:0;width:100%;height:3px;background:var(--navy);transform:scaleX(0);transform-origin:left;transition:.3s;}
.sol:hover{box-shadow:var(--shadow);transform:translateY(-5px);border-color:transparent;}
.sol:hover::before{transform:scaleX(1);background:var(--orange);}
.sol-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;}
.sol-ico{width:52px;height:52px;border-radius:8px;background:#eef4fa;color:var(--navy);display:flex;align-items:center;justify-content:center;transition:.28s;}
.sol-ico svg{width:28px;height:28px;}
.sol:hover .sol-ico{background:var(--navy);color:#fff;}
.num{font-size:26px;font-weight:800;color:#e3e9ef;font-family:"Arial",sans-serif;}
.sol h3{font-size:19px;color:var(--navy);margin-bottom:10px;}
.sol p{font-size:14px;color:var(--muted);}

/* ============ 研发实力 ============ */
.adv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.adv{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:8px;padding:28px 22px;transition:.28s;}
.adv:hover{background:rgba(255,255,255,.12);transform:translateY(-5px);}
.adv-ico{width:50px;height:50px;border-radius:50%;background:var(--orange);color:#fff;display:flex;align-items:center;justify-content:center;margin-bottom:16px;}
.adv-ico svg{width:26px;height:26px;}
.adv h3{color:#fff;font-size:18px;margin-bottom:10px;}
.adv p{color:#b9cbdf;font-size:13.5px;}
.adv-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:40px;background:rgba(255,255,255,.08);border-radius:8px;}
.ai{text-align:center;padding:26px 10px;border-right:1px solid rgba(255,255,255,.12);}
.ai:last-child{border-right:none;}
.ai b{display:block;font-size:30px;color:var(--orange-2);font-weight:800;}
.ai b em{font-style:normal;font-size:14px;}
.ai span{font-size:13px;color:#c4d4e4;margin-top:6px;display:block;}

/* ============ 新闻 ============ */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.news{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 4px 16px rgba(10,61,107,.07);transition:.28s;display:flex;flex-direction:column;}
.news:hover{transform:translateY(-6px);box-shadow:var(--shadow-h);}
.nimg{height:210px;overflow:hidden;}
.nimg img{width:100%;height:100%;object-fit:cover;transition:.5s;}
.news:hover .nimg img{transform:scale(1.07);}
.nbody{padding:20px 22px;display:flex;flex-direction:column;flex:1;}
.ndate{font-size:13px;color:var(--orange);font-family:"Arial",sans-serif;font-weight:600;}
.nbody h3{font-size:17px;color:var(--navy);margin:10px 0;line-height:1.5;}
.nbody p{font-size:13.5px;color:var(--muted);flex:1;}
.nmore{margin-top:14px;font-size:14px;color:var(--navy-3);font-weight:600;}
.nmore .arr{color:var(--orange);}
.news:hover .nmore{color:var(--orange);}

/* ============ 联系 ============ */
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:40px;}
.contact-info{display:flex;flex-direction:column;gap:22px;}
.ci{display:flex;align-items:flex-start;gap:16px;}
.ci-ico{width:46px;height:46px;border-radius:50%;background:#eef4fa;color:var(--navy);display:flex;align-items:center;justify-content:center;flex:none;}
.ci-ico svg{width:23px;height:23px;}
.ci small{display:block;font-size:13px;color:var(--muted);}
.ci b{font-size:17px;color:var(--navy);font-weight:600;}
.ci b a:hover{color:var(--orange);}
.contact-map-tip{margin-top:8px;background:var(--bg);border-left:3px solid var(--orange);padding:16px 18px;border-radius:0 6px 6px 0;}
.contact-map-tip p{font-size:14px;color:var(--muted);}
.contact-map-tip .credit{margin-top:8px;font-size:12.5px;color:#98a4b1;}
.form-card{background:#fff;border:1px solid var(--line);border-radius:8px;padding:34px 36px;box-shadow:var(--shadow);}
.form-card h3{font-size:22px;color:var(--navy);}
.fsub{font-size:13.5px;color:var(--muted);margin:6px 0 22px;}
.frow{display:grid;grid-template-columns:1fr 1fr;gap:18px;}
.field{margin-bottom:18px;}
.field label{display:block;font-size:14px;color:var(--text);margin-bottom:7px;}
.field label em{color:var(--orange);font-style:normal;}
.field input,.field select,.field textarea{width:100%;border:1px solid var(--line);border-radius:4px;padding:11px 13px;font-size:14px;font-family:inherit;outline:none;transition:.2s;background:#fff;}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--navy-3);box-shadow:0 0 0 3px rgba(18,103,168,.1);}
.field textarea{resize:vertical;}
.form-card .btn{width:100%;padding:13px;font-size:16px;}
.form-note{font-size:12px;color:#98a4b1;margin-top:12px;text-align:center;}
.form-success{display:none;text-align:center;padding:40px 10px;}
.ok-ico{width:66px;height:66px;border-radius:50%;background:#e7f6ec;color:#1fa352;display:flex;align-items:center;justify-content:center;margin:0 auto 20px;}
.ok-ico svg{width:36px;height:36px;}
.form-success h4{font-size:20px;color:var(--navy);margin-bottom:12px;}
.form-success p{color:var(--muted);font-size:14px;}

/* ============ 页脚 ============ */
.footer{background:var(--navy-deep);color:#aebfcf;padding:56px 0 0;}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:36px;padding-bottom:40px;}
.foot-logo{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.logo-mark.sm{width:42px;height:42px;}
.foot-logo b{color:#fff;font-size:20px;}
.foot-about p{font-size:13.5px;line-height:1.9;}
.foot-col h4{color:#fff;font-size:16px;margin-bottom:18px;position:relative;padding-bottom:10px;}
.foot-col h4::after{content:"";position:absolute;left:0;bottom:0;width:28px;height:2px;background:var(--orange);}
.foot-col ul li{margin-bottom:11px;font-size:14px;}
.foot-col ul li a:hover{color:var(--orange-2);}
.foot-contact li{line-height:1.7;}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);padding:18px 0;display:flex;align-items:center;justify-content:space-between;font-size:12.5px;color:#8095a8;gap:16px;flex-wrap:wrap;}
.foot-bottom a{color:#aebfcf;}
.foot-bottom a:hover{color:var(--orange-2);}

/* ============ 右侧悬浮 ============ */
.float-bar{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:950;display:flex;flex-direction:column;gap:1px;box-shadow:0 8px 24px rgba(10,61,107,.2);border-radius:8px;overflow:hidden;}
.fb-item{width:64px;height:62px;background:var(--navy);color:#fff;border:none;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;transition:.2s;font-size:12px;font-family:inherit;}
.fb-item svg{width:22px;height:22px;}
.fb-item:hover{background:var(--orange);}
.fb-top{display:none;}
.fb-top.show{display:flex;}
.wechat-pop{position:absolute;right:74px;top:126px;width:170px;background:#fff;border-radius:8px;box-shadow:var(--shadow-h);padding:16px;text-align:center;opacity:0;visibility:hidden;transform:translateX(10px);transition:.25s;}
.wechat-pop.show{opacity:1;visibility:visible;transform:translateX(0);}
.wechat-pop::after{content:"";position:absolute;right:-8px;top:54px;border-width:8px 0 8px 8px;border-style:solid;border-color:transparent transparent transparent #fff;}
.qr-placeholder{width:120px;height:120px;margin:0 auto 8px;background:#f1f5f9;border-radius:6px;display:flex;align-items:center;justify-content:center;}
.qr-placeholder svg{width:54px;height:54px;}
.wechat-pop p{font-size:14px;color:var(--navy);font-weight:600;}
.wechat-pop small{font-size:12px;color:var(--muted);}

/* ============ 滚动揭示 ============ */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease;}
.reveal.in{opacity:1;transform:none;}
.reveal.d1{transition-delay:.1s;}
.reveal.d2{transition-delay:.2s;}
.reveal.d3{transition-delay:.3s;}

/* ============ 响应式 ============ */
@media (max-width:991px){
  .header-inner{flex-wrap:wrap;gap:14px;}
  .logo-text b{font-size:20px;}
  .header-tel{padding:6px 14px;}
  .nav-menu{position:absolute;top:100%;left:0;right:0;background:var(--navy);flex-direction:column;display:none;box-shadow:0 12px 24px rgba(0,0,0,.2);}
  .nav-menu.open{display:block;}
  .nav-menu>li{flex:none;}
  .nav-menu>li>a{height:50px;border-bottom:1px solid rgba(255,255,255,.08);}
  .nav-menu>li.active>a{background:transparent;color:var(--orange-2);}
  .burger{display:block;}
  .burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
  .burger.open span:nth-child(2){opacity:0;}
  .burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
  .navbar.menu-open{position:relative;}
  .banner{height:400px;}
  .banner-text h1{font-size:32px;}
  .quick-grid{grid-template-columns:repeat(2,1fr);}
  .quick-item:nth-child(2){border-right:none;}
  .quick-item:nth-child(1),.quick-item:nth-child(2){border-bottom:1px solid var(--line);}
  .about-grid{grid-template-columns:1fr;gap:36px;}
  .about-media img{height:320px;}
  .about-badge{left:0;}
  .pgrid,.sol-grid,.news-grid{grid-template-columns:repeat(2,1fr);}
  .adv-grid{grid-template-columns:repeat(2,1fr);}
  .contact-grid{grid-template-columns:1fr;}
  .foot-grid{grid-template-columns:1fr 1fr;gap:30px;}
}
@media (max-width:600px){
  .topbar{font-size:12px;}
  .top-links{display:none;}
  .logo-mark{width:46px;height:46px;}
  .logo-text b{font-size:17px;}
  .logo-text span{font-size:9px;}
  .header-tel{width:100%;justify-content:center;}
  .tel-num{font-size:22px;}
  .banner{height:380px;}
  .banner-text h1{font-size:26px;}
  .banner-text p{font-size:14px;}
  .quick-grid{grid-template-columns:1fr;}
  .quick-item{border-right:none;border-bottom:1px solid var(--line);}
  .about-feats{grid-template-columns:repeat(2,1fr);}
  .pgrid,.sol-grid,.news-grid,.adv-grid,.adv-strip{grid-template-columns:1fr;}
  .ai{border-right:none;border-bottom:1px solid rgba(255,255,255,.12);}
  .frow{grid-template-columns:1fr;gap:0;}
  .foot-grid{grid-template-columns:1fr;}
  .product-search{justify-content:center;}
  .search-box{width:100%;}
  .float-bar{right:8px;}
  .fb-item{width:52px;height:52px;font-size:11px;}
  .fb-item svg{width:20px;height:20px;}
}