:root{
  --primary:#005f9b;
  --primary-dark:#004a7a;
  --primary-light:#e8f2fa;
  --accent:#e7505a;
  --text:#333333;
  --muted:#888888;
  --line:#e6e6e6;
  --bg:#f7f9fb;
  --maxw:1200px;
}
*{box-sizing:border-box;margin:0;padding:0;}
body{font-family:"Microsoft YaHei","PingFang SC",-apple-system,"Segoe UI",sans-serif;color:var(--text);background:var(--bg);line-height:1.7;}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 16px;}

/* ---------- 头部 ---------- */
.site-header{background:#fff;box-shadow:0 2px 8px rgba(0,0,0,.06);position:sticky;top:0;z-index:50;}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:66px;}
.logo{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700;color:var(--primary);}
.logo img{height:38px;width:auto;}
.main-nav ul{display:flex;list-style:none;gap:6px;}
.main-nav li a{display:block;padding:8px 16px;border-radius:6px;font-size:15px;transition:.2s;}
.main-nav li a:hover{color:var(--primary);background:var(--primary-light);}
.main-nav li.active a{color:#fff;background:var(--primary);}
.nav-toggle{display:none;background:none;border:none;font-size:26px;color:var(--primary);cursor:pointer;}

/* ---------- Banner 轮播 ---------- */
.banner{position:relative;height:440px;overflow:hidden;background:#003a5f;}
.banner .slides{position:relative;height:100%;}
.banner .slide{position:absolute;inset:0;opacity:0;transition:opacity .8s;display:flex;align-items:center;
  background-size:cover;background-position:center;color:#fff;}
.banner .slide.active{opacity:1;}
.banner .slide::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,40,70,.65),rgba(0,40,70,.15));}
.banner-text{position:relative;z-index:2;max-width:var(--maxw);margin:0 auto;width:100%;padding:0 16px;}
.banner-text h2{font-size:42px;margin-bottom:12px;text-shadow:0 2px 8px rgba(0,0,0,.3);}
.banner-text p{font-size:18px;opacity:.95;text-shadow:0 1px 6px rgba(0,0,0,.3);}
.banner-prev,.banner-next{position:absolute;top:50%;transform:translateY(-50%);z-index:3;background:rgba(0,0,0,.3);color:#fff;border:none;width:44px;height:44px;border-radius:50%;font-size:22px;cursor:pointer;}
.banner-prev{left:16px;}.banner-next{right:16px;}
.banner-dots{position:absolute;bottom:16px;left:50%;transform:translateX(-50%);z-index:3;display:flex;gap:8px;}
.banner-dots span{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.5);cursor:pointer;}
.banner-dots span.active{background:#fff;}

/* ---------- 区块 ---------- */
.section{padding:54px 0;}
.section:nth-child(even){background:#fff;}
.section-title{text-align:center;font-size:26px;margin-bottom:30px;position:relative;}
.section-title::after{content:"";display:block;width:48px;height:3px;background:var(--primary);margin:12px auto 0;border-radius:2px;}
.section.variety{background:var(--primary-light);}
.more{text-align:center;margin-top:26px;}
.more a{color:var(--primary);font-size:15px;}

/* ---------- 网格卡片 ---------- */
.grid{display:grid;gap:22px;}
.product-grid{grid-template-columns:repeat(4,1fr);}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;transition:.25s;}
.card:hover{transform:translateY(-6px);box-shadow:0 12px 28px rgba(0,0,0,.1);}
.card-img{aspect-ratio:4/3;background:var(--primary-light);display:flex;align-items:center;justify-content:center;overflow:hidden;}
.card-img img{width:100%;height:100%;object-fit:cover;}
.card-body{padding:16px;}
.card-body h4{font-size:17px;margin-bottom:6px;color:var(--text);}
.card-body p{font-size:13px;color:var(--muted);height:38px;overflow:hidden;}

/* 新闻 */
.news-grid{grid-template-columns:repeat(3,1fr);}
.news-card .card-img{aspect-ratio:16/9;}
.news-card .date{font-size:12px;color:var(--primary);margin-bottom:4px;}

/* 知识服务（复用 news-grid 卡片样式） */
.member{padding:22px 14px;background:#fff;border:1px solid var(--line);border-radius:10px;transition:.25s;}
.member:hover{box-shadow:0 10px 24px rgba(0,0,0,.08);}
.member .avatar{width:110px;height:110px;border-radius:50%;margin:0 auto 14px;object-fit:cover;background:var(--primary-light);}
.member h4{font-size:17px;}
.member .pos{color:var(--primary);font-size:14px;margin:4px 0 6px;}

/* ---------- 列表 / 详情 ---------- */
.page-head{background:var(--primary);color:#fff;padding:40px 0;}
.page-head h1{font-size:26px;}
.breadcrumb{padding:12px 0;font-size:13px;color:var(--muted);}
.breadcrumb a:hover{color:var(--primary);}
.layout{display:grid;grid-template-columns:1fr 260px;gap:30px;padding:30px 0;}
.list-col{}
.sidebar{background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px;align-self:start;}
.sidebar h3{font-size:16px;margin-bottom:12px;color:var(--primary);}
.sidebar ul{list-style:none;}
.sidebar li a{display:block;padding:8px 10px;border-radius:6px;font-size:14px;}
.sidebar li a:hover{background:var(--primary-light);}
.sidebar li.active a{background:var(--primary);color:#fff;}

.list{display:grid;gap:18px;}
.list.product{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.list .item{background:#fff;border:1px solid var(--line);border-radius:10px;overflow:hidden;transition:.2s;}
.list .item:hover{box-shadow:0 8px 20px rgba(0,0,0,.08);}
.list .item .thumb{aspect-ratio:4/3;background:var(--primary-light);}
.list .item .thumb img{width:100%;height:100%;object-fit:cover;}
.list .item .ttl{padding:12px;text-align:center;font-size:15px;}
.detail{background:#fff;border:1px solid var(--line);border-radius:10px;padding:30px;}
.detail h1{font-size:24px;margin-bottom:10px;color:var(--primary);}
.detail .meta{color:var(--muted);font-size:13px;margin-bottom:18px;border-bottom:1px solid var(--line);padding-bottom:10px;}
.detail .content{font-size:15px;color:#444;}
.detail .content img{max-width:100%;}

/* 招聘 */
.job{padding:22px;border:1px solid var(--line);border-radius:10px;background:#fff;margin-bottom:16px;}
.job h3{font-size:18px;color:var(--primary);margin-bottom:8px;}
.job .content{color:#555;font-size:14px;}
.job .apply{margin-top:12px;}
.btn{display:inline-block;padding:9px 22px;border-radius:6px;border:none;cursor:pointer;font-size:14px;}
.btn-primary{background:var(--primary);color:#fff;}
.btn-primary:hover{background:var(--primary-dark);}
.btn-ghost{background:#fff;color:var(--primary);border:1px solid var(--primary);}
.btn-danger{background:var(--accent);color:#fff;}
.pagination{display:flex;justify-content:center;gap:6px;margin-top:24px;}
.pagination a,.pagination span{padding:7px 13px;border:1px solid var(--line);border-radius:6px;background:#fff;}
.pagination a.active{background:var(--primary);color:#fff;border-color:var(--primary);}

/* 联系 */
.contact-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:30px;}
.contact-cards .item{background:#fff;border:1px solid var(--line);border-radius:10px;padding:26px;text-align:center;}
.contact-cards .ico{width:46px;height:46px;margin:0 auto 12px;border-radius:50%;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:22px;}
.contact-cards .info{font-size:13px;color:var(--muted);}
.contact-cards .title{font-size:16px;margin-top:4px;}
.feedback{border:1px solid var(--line);border-radius:10px;padding:28px;background:#fff;max-width:640px;margin:0 auto;}
.feedback h3{font-size:20px;margin-bottom:6px;}
.feedback .tip{color:var(--muted);font-size:13px;margin-bottom:18px;}
.feedback form ul{list-style:none;display:grid;gap:14px;}
.feedback input,.feedback textarea{width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:6px;font-size:14px;font-family:inherit;}
.feedback textarea{min-height:120px;resize:vertical;}
.msg{margin-top:10px;font-size:14px;min-height:20px;}
.msg.ok{color:green;}.msg.err{color:var(--accent);}

/* ---------- 页脚 ---------- */
.site-footer{background:#1f2a36;color:#c9d3dc;margin-top:40px;}
.site-footer .cols{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;padding:44px 0;}
.site-footer h3{color:#fff;font-size:15px;margin-bottom:14px;}
.site-footer ul{list-style:none;}
.site-footer li{margin-bottom:8px;font-size:13px;}
.site-footer li a:hover{color:#fff;}
.site-footer .qrcode img{width:110px;height:110px;background:#fff;padding:6px;border-radius:6px;}
.site-footer .phone{font-size:18px;color:#fff;}
.copyright{border-top:1px solid #324150;padding:16px 0;font-size:12px;color:#8c98a5;}
.copyright .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;}
.copyright a{color:#8c98a5;}

/* ---------- 响应式 ---------- */
@media(max-width:900px){
  .product-grid,.news-grid{grid-template-columns:repeat(2,1fr);}
  .list.product{grid-template-columns:repeat(2,1fr);}
  .contact-cards{grid-template-columns:1fr;}
  .site-footer .cols{grid-template-columns:repeat(2,1fr);}
  .layout{grid-template-columns:1fr;}
  .banner{height:300px;}
  .banner-text h2{font-size:30px;}
}
@media(max-width:640px){
  .nav-toggle{display:block;}
  .main-nav{position:absolute;top:66px;left:0;right:0;background:#fff;display:none;box-shadow:0 6px 16px rgba(0,0,0,.1);}
  .main-nav.open{display:block;}
  .main-nav ul{flex-direction:column;padding:8px;}
  .product-grid,.news-grid,.list.product{grid-template-columns:1fr;}
  .site-footer .cols{grid-template-columns:1fr;}
}