/* ===== 基础变量与重置 ===== */
:root{
  --primary:#0d4b8f;
  --primary-dark:#083868;
  --accent:#ff8a3d;
  --accent-dark:#f06f1c;
  --text:#1f2b3d;
  --text-light:#5b6b84;
  --border:#e6ebf2;
  --bg:#ffffff;
  --bg-gray:#f5f8fc;
  --radius:12px;
  --shadow:0 8px 28px rgba(13,75,143,.10);
  --shadow-hover:0 14px 40px rgba(13,75,143,.18);
  --max-width:1200px;
  --header-h:72px;
}
*{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:1.75;font-size:15px;
  -webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none}
.icon{width:1em;height:1em;vertical-align:-.12em}
.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 20px}

/* ===== 通用组件 ===== */
.btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:12px 26px;border-radius:999px;font-size:15px;font-weight:500;
  transition:all .25s ease;border:1px solid transparent;
}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 6px 18px rgba(255,138,61,.32)}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px)}
.btn-ghost{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.5)}
.btn-ghost:hover{background:#fff;color:var(--primary)}
.btn-block{width:100%;justify-content:center}

.section{padding:90px 0}
.section-gray{background:var(--bg-gray)}
.section-dark{background:linear-gradient(135deg,#0b3d78,#12598f 60%,#1b7fa8);color:#fff}
.section-head{text-align:center;max-width:720px;margin:0 auto 52px}
.section-tag{
  display:inline-block;font-size:12px;letter-spacing:3px;color:var(--accent);
  font-weight:700;margin-bottom:10px;
}
.section-title{
  font-size:34px;font-weight:700;letter-spacing:1px;position:relative;
  padding-bottom:16px;margin-bottom:14px;
}
.section-title::after{
  content:"";position:absolute;left:50%;bottom:0;transform:translateX(-50%);
  width:56px;height:3px;background:var(--accent);border-radius:2px;
}
.section-sub{color:var(--text-light);font-size:15px}
.section-head-light .section-title,.section-head-light .section-sub{color:#fff}
.section-head-light .section-sub{opacity:.85}

/* 滚动出现动画 */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .6s ease,transform .6s ease}
.reveal.is-in{opacity:1;transform:none}

/* ===== 顶部信息条 ===== */
.topbar{background:var(--primary-dark);color:rgba(255,255,255,.85);font-size:13px}
.topbar-inner{height:38px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.topbar-contact .icon{margin-right:4px;vertical-align:-2px}
.topbar-contact .dot{margin:0 10px;opacity:.4}

/* ===== 导航 ===== */
.header{
  position:sticky;top:0;z-index:100;background:#fff;
  border-bottom:1px solid transparent;transition:box-shadow .3s,background .3s;
}
.header.is-sticky{box-shadow:0 4px 18px rgba(13,75,143,.10)}
.header-inner{
  height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.logo{display:flex;align-items:center;gap:12px}
.logo-mark{
  width:44px;height:44px;flex:none;border-radius:10px;
  background:linear-gradient(135deg,var(--primary),#1b7fa8);
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:15px;font-weight:700;letter-spacing:1px;
}
.logo-text{display:flex;flex-direction:column;line-height:1.3}
.logo-text strong{font-size:18px;color:var(--primary-dark);letter-spacing:.5px}
.logo-text em{font-style:normal;font-size:11px;color:var(--text-light);letter-spacing:1px}
.nav{display:flex;gap:4px}
.nav-link{
  position:relative;padding:8px 14px;font-size:15px;color:var(--text);
  border-radius:6px;transition:color .2s;
}
.nav-link:hover,.nav-link.active{color:var(--primary)}
.nav-link.active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:2px;
  background:var(--accent);border-radius:2px;
}
.header-btn{padding:9px 22px;font-size:14px}
.menu-toggle{display:none;font-size:24px;color:var(--primary-dark)}

/* ===== 首屏轮播 ===== */
.hero{position:relative;height:520px;overflow:hidden}
.hero-slides{position:relative;height:100%}
.hero-slide{
  position:absolute;inset:0;background:var(--bg);color:#fff;
  display:flex;align-items:center;opacity:0;transition:opacity .8s ease;
}
.hero-slide.is-active{opacity:1}
.hero-slide::after{
  content:"";position:absolute;inset:0;
  background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><circle cx='20' cy='20' r='1.5' fill='rgba(255,255,255,.18)'/></svg>") repeat;
}
.hero-content{position:relative;z-index:2;max-width:720px}
.hero-tag{
  display:inline-block;padding:5px 16px;border:1px solid rgba(255,255,255,.45);
  border-radius:999px;font-size:13px;letter-spacing:1px;margin-bottom:20px;
  background:rgba(255,255,255,.1);
}
.hero-title{font-size:46px;line-height:1.25;font-weight:700;margin-bottom:20px;letter-spacing:1px}
.hero-desc{font-size:16px;opacity:.92;max-width:620px;margin-bottom:32px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-dots{position:absolute;left:0;right:0;bottom:26px;display:flex;justify-content:center;gap:10px;z-index:3}
.hero-dots span{
  width:28px;height:4px;border-radius:2px;background:rgba(255,255,255,.4);cursor:pointer;transition:.3s;
}
.hero-dots span.is-active{background:#fff;width:44px}
.hero-arrow{
  position:absolute;top:50%;transform:translateY(-50%);z-index:3;
  width:44px;height:44px;border-radius:50%;color:#fff;font-size:20px;
  background:rgba(0,0,0,.18);border:1px solid rgba(255,255,255,.3);transition:.3s;
}
.hero-arrow:hover{background:rgba(0,0,0,.38)}
.hero-prev{left:24px}
.hero-next{right:24px}

/* ===== 数据统计 ===== */
.stats{background:#fff;padding:44px 0;border-bottom:1px solid var(--border)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat-num{font-size:40px;font-weight:700;color:var(--primary);letter-spacing:1px}
.stat-plus{font-size:22px;font-weight:700;color:var(--accent)}
.stat-item p{color:var(--text-light);font-size:14px}

/* ===== 关于我们 ===== */
.about-wrap{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.about-media{position:relative;padding-bottom:40px}
.about-img{border-radius:var(--radius);box-shadow:var(--shadow)}
.about-img-main{
  height:360px;
  background:linear-gradient(140deg,#0d4b8f,#1b7fa8 60%,#5ec0d6);
}
.about-img-sub{
  position:absolute;right:-10px;bottom:0;width:190px;height:150px;
  background:linear-gradient(140deg,#ff8a3d,#ffb277);
  border:5px solid #fff;
}
.about-badge{
  position:absolute;left:-14px;bottom:36px;background:#fff;border-radius:var(--radius);
  padding:14px 20px;box-shadow:var(--shadow);display:flex;align-items:center;gap:10px;
}
.about-badge strong{font-size:34px;color:var(--accent);line-height:1}
.about-badge span{font-size:12px;color:var(--text-light);line-height:1.4}
.about-text h3{font-size:24px;margin-bottom:16px;color:var(--primary-dark)}
.about-text p{color:var(--text-light);margin-bottom:14px}
.about-list{margin:18px 0}
.about-list li{
  display:flex;align-items:flex-start;gap:8px;margin-bottom:10px;font-size:15px;
}
.about-list .icon{color:var(--accent);font-size:18px;margin-top:4px;flex:none}
.about-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}
.about-tags span{
  padding:6px 16px;background:var(--bg-gray);border:1px solid var(--border);
  border-radius:999px;font-size:13px;color:var(--primary);
}

/* ===== 主营业务 ===== */
.biz-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.biz-card{
  background:#fff;border-radius:var(--radius);padding:32px 26px;
  box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s;
  border-top:3px solid transparent;
}
.biz-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-top-color:var(--accent)}
.biz-icon{
  width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,rgba(13,75,143,.1),rgba(27,127,168,.16));
  color:var(--primary);font-size:26px;margin-bottom:18px;
}
.biz-card h3{font-size:18px;margin-bottom:10px;color:var(--primary-dark)}
.biz-card p{color:var(--text-light);font-size:14px}

/* ===== 产品中心 ===== */
.filter-bar{display:flex;justify-content:center;flex-wrap:wrap;gap:10px;margin-bottom:36px}
.filter-btn{
  padding:9px 22px;border-radius:999px;background:#fff;border:1px solid var(--border);
  color:var(--text-light);font-size:14px;transition:.25s;
}
.filter-btn:hover{color:var(--primary);border-color:var(--primary)}
.filter-btn.is-active{background:var(--primary);border-color:var(--primary);color:#fff}
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.product-card{
  background:#fff;border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s;
}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.product-card.is-hide{display:none}
.product-thumb{
  height:170px;display:flex;align-items:flex-end;padding:16px;color:#fff;
  font-size:14px;letter-spacing:1px;position:relative;
}
.product-thumb::before{
  content:"";position:absolute;inset:0;
  background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='80' height='80'><path d='M0 80 L80 0' stroke='rgba(255,255,255,.12)' stroke-width='2'/></svg>");
}
.product-thumb span{position:relative;z-index:2;font-weight:600}
.thumb-1{background:linear-gradient(135deg,#1b7fa8,#5ec0d6)}
.thumb-2{background:linear-gradient(135deg,#0d4b8f,#3f8fc4)}
.thumb-3{background:linear-gradient(135deg,#2b7a5e,#5fbf95)}
.thumb-4{background:linear-gradient(135deg,#6a3d94,#a874d8)}
.thumb-5{background:linear-gradient(135deg,#c2577f,#f193b3)}
.thumb-6{background:linear-gradient(135deg,#d1783f,#f2ab72)}
.thumb-7{background:linear-gradient(135deg,#7a8b2d,#b6c86a)}
.thumb-8{background:linear-gradient(135deg,#b8472f,#e88a63)}
.thumb-9{background:linear-gradient(135deg,#2f6b8b,#74b0cd)}
.thumb-10{background:linear-gradient(135deg,#8a6327,#cfa35f)}
.thumb-11{background:linear-gradient(135deg,#3c5aa8,#7d97e0)}
.thumb-12{background:linear-gradient(135deg,#4a5b6b,#93a5b5)}
.thumb-13{background:linear-gradient(135deg,#1f4f6b,#5f96b3)}
.thumb-14{background:linear-gradient(135deg,#5b3d8f,#9a7fd6)}
.product-body{padding:18px 20px 22px}
.product-body h3{font-size:16px;margin-bottom:6px;color:var(--primary-dark)}
.product-body p{font-size:13px;color:var(--text-light);margin-bottom:12px}
.product-tag{
  display:inline-block;padding:3px 12px;border-radius:999px;font-size:12px;
  background:rgba(255,138,61,.12);color:var(--accent-dark);
}

/* ===== 服务优势 ===== */
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.adv-card{
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);
  border-radius:var(--radius);padding:28px 24px;transition:.3s;
}
.adv-card:hover{background:rgba(255,255,255,.14);transform:translateY(-5px)}
.adv-icon{
  width:50px;height:50px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:rgba(255,255,255,.16);font-size:24px;margin-bottom:16px;
}
.adv-card h3{font-size:18px;margin-bottom:8px}
.adv-card p{font-size:14px;opacity:.85}
.process{
  margin-top:56px;display:grid;grid-template-columns:repeat(5,1fr);gap:16px;
  border-top:1px solid rgba(255,255,255,.18);padding-top:40px;
}
.process-item{text-align:center;position:relative}
.process-step{
  display:inline-flex;align-items:center;justify-content:center;
  width:46px;height:46px;border-radius:50%;font-weight:700;font-size:15px;
  background:var(--accent);color:#fff;margin-bottom:12px;
}
.process-item h4{font-size:16px;margin-bottom:6px}
.process-item p{font-size:13px;opacity:.8}

/* ===== 新闻资讯 ===== */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{
  background:#fff;border-radius:var(--radius);overflow:hidden;
  box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s;
}
.news-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.news-thumb{height:180px;display:flex;align-items:flex-end;padding:16px;color:#fff;font-weight:600}
.news-thumb-1{background:linear-gradient(135deg,#0d4b8f,#3f8fc4)}
.news-thumb-2{background:linear-gradient(135deg,#2b7a5e,#6cc79b)}
.news-thumb-3{background:linear-gradient(135deg,#8a5a2b,#d4a765)}
.news-body{padding:20px}
.news-date{font-size:12px;color:var(--text-light)}
.news-body h3{font-size:17px;margin:8px 0 10px;line-height:1.5;color:var(--primary-dark)}
.news-body p{font-size:14px;color:var(--text-light);margin-bottom:14px}
.news-more{font-size:14px;color:var(--primary);display:inline-flex;align-items:center;gap:4px}
.news-more:hover{color:var(--accent-dark)}

/* ===== 联系我们 ===== */
.contact-wrap{display:grid;grid-template-columns:1fr 1.15fr;gap:44px}
.contact-info{display:flex;flex-direction:column;gap:18px}
.info-item{
  display:flex;gap:14px;align-items:flex-start;background:#fff;
  border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow);
}
.info-icon{
  width:44px;height:44px;flex:none;border-radius:10px;
  background:linear-gradient(135deg,var(--primary),#1b7fa8);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:20px;
}
.info-item h4{font-size:15px;margin-bottom:2px}
.info-item p{font-size:14px;color:var(--text-light)}
.info-qr{
  background:#fff;border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);
  display:flex;align-items:center;gap:18px;
}
.qr-box{
  width:96px;height:96px;flex:none;border-radius:10px;border:1px dashed var(--primary);
  display:flex;align-items:center;justify-content:center;text-align:center;
  font-size:13px;color:var(--primary);background:var(--bg-gray);
}
.info-qr p{font-size:13px;color:var(--text-light)}
.contact-form{
  background:#fff;border-radius:var(--radius);padding:34px;box-shadow:var(--shadow);
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-group{margin-bottom:18px}
.form-group label{display:block;font-size:14px;margin-bottom:8px;color:var(--text)}
.form-group label i{color:var(--accent);font-style:normal}
.form-group input,
.form-group select,
.form-group textarea{
  width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:8px;
  font-size:14px;font-family:inherit;color:var(--text);background:#fbfcfe;
  transition:border-color .2s,box-shadow .2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus{
  outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(13,75,143,.1);
}
.form-group textarea{resize:vertical}
.form-group.has-error input,
.form-group.has-error select{border-color:#e0453c}
.error{display:block;min-height:18px;font-size:12px;color:#e0453c;margin-top:4px}
.form-tip{font-size:12px;color:var(--text-light);margin-top:12px;text-align:center}
.form-success{
  background:rgba(43,122,94,.1);color:#2b7a5e;border:1px solid rgba(43,122,94,.3);
  border-radius:8px;padding:12px;font-size:14px;text-align:center;margin-bottom:16px;
}

/* ===== 页脚 ===== */
.footer{background:#0a2b4d;color:rgba(255,255,255,.72);font-size:14px}
.footer-top{
  display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px;padding:60px 20px 40px;
}
.footer-logo{display:flex;align-items:center;gap:12px;margin-bottom:16px;color:#fff}
.footer-logo .logo-mark{width:40px;height:40px;border-radius:10px;font-size:14px}
.footer-logo strong{font-size:17px}
.footer-about p{line-height:1.9;font-size:13px}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:18px;position:relative;padding-left:12px}
.footer-col h4::before{
  content:"";position:absolute;left:0;top:6px;width:3px;height:14px;background:var(--accent);border-radius:2px;
}
.footer-col ul li{margin-bottom:10px}
.footer-col ul li a{transition:.2s}
.footer-col ul li a:hover{color:var(--accent)}
.footer-contact li{display:flex;align-items:flex-start;gap:8px;font-size:13px}
.footer-contact .icon{margin-top:5px;color:var(--accent)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12)}
.footer-bottom-inner{
  padding:18px 20px;display:flex;justify-content:space-between;align-items:center;
  flex-wrap:wrap;gap:8px;font-size:13px;
}
.footer-bottom a:hover{color:var(--accent)}

/* ===== 返回顶部 ===== */
.back-top{
  position:fixed;right:24px;bottom:34px;width:44px;height:44px;border-radius:50%;
  background:var(--primary);color:#fff;font-size:20px;display:flex;
  align-items:center;justify-content:center;box-shadow:var(--shadow);
  opacity:0;visibility:hidden;transition:.3s;z-index:99;
}
.back-top.is-show{opacity:1;visibility:visible}
.back-top:hover{background:var(--accent)}

/* ===== 响应式 ===== */
@media (max-width:1024px){
  .biz-grid,.adv-grid,.news-grid{grid-template-columns:repeat(2,1fr)}
  .product-grid{grid-template-columns:repeat(3,1fr)}
  .footer-top{grid-template-columns:1fr 1fr;gap:32px}
  .hero-title{font-size:38px}
  .process{grid-template-columns:repeat(3,1fr);row-gap:26px}
}
@media (max-width:768px){
  .topbar-contact{display:none}
  .topbar-inner{justify-content:center}
  .nav{
    position:fixed;top:calc(var(--header-h) + 38px);left:0;right:0;
    background:#fff;flex-direction:column;padding:10px 20px 20px;
    box-shadow:0 10px 24px rgba(13,75,143,.12);
    transform:translateY(-12px);opacity:0;visibility:hidden;transition:.25s;
  }
  .nav.is-open{transform:none;opacity:1;visibility:visible}
  .header.is-sticky .nav{top:var(--header-h)}
  .nav-link{padding:12px 0;border-bottom:1px solid var(--border)}
  .nav-link.active::after{display:none}
  .header-btn{display:none}
  .menu-toggle{display:block}
  .section{padding:60px 0}
  .section-title{font-size:26px}
  .hero{height:460px}
  .hero-title{font-size:28px}
  .hero-desc{font-size:14px}
  .hero-arrow{display:none}
  .stats-grid{grid-template-columns:repeat(2,1fr);row-gap:26px}
  .stat-num{font-size:32px}
  .about-wrap,.contact-wrap{grid-template-columns:1fr;gap:32px}
  .about-img-main{height:260px}
  .about-img-sub{width:140px;height:110px}
  .biz-grid,.adv-grid,.news-grid,.product-grid{grid-template-columns:1fr}
  .product-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .process{grid-template-columns:repeat(2,1fr)}
  .form-row{grid-template-columns:1fr}
  .contact-form{padding:24px}
  .footer-top{grid-template-columns:1fr;gap:28px;padding:44px 20px 30px}
  .footer-bottom-inner{justify-content:center;text-align:center}
}
@media (max-width:480px){
  .product-grid{grid-template-columns:1fr}
  .hero{height:420px}
  .logo-text strong{font-size:16px}
  .logo-text em{display:none}
}