:root{--brand:#0862c3;--brand-dark:#064a96;--ink:#1f2933;--muted:#6b7280;--line:#e5e7eb;--bg-alt:#f5f8fc;--radius:10px}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{font-family:"Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);line-height:1.7;background:#fff}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{max-width:1160px;margin:0 auto;padding:0 20px}
.container-narrow{max-width:820px;margin:0 auto;padding:0 20px}

/* 头部 / 导航 */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-size:20px;font-weight:700;color:var(--brand)}
.nav-toggle{display:none;background:none;border:0;font-size:24px;cursor:pointer;color:var(--brand)}
.nav ul{list-style:none;display:flex;gap:22px;align-items:center}
.nav a{padding:8px 0;font-size:15px;color:var(--ink);position:relative}
.nav a:hover{color:var(--brand)}
.has-sub{position:relative}
.has-sub .sub{display:none;position:absolute;top:100%;left:0;background:#fff;border:1px solid var(--line);border-radius:8px;min-width:160px;box-shadow:0 8px 24px rgba(0,0,0,.08);padding:6px 0}
.has-sub:hover .sub{display:block}
.has-sub .sub li{padding:0}
.has-sub .sub a{display:block;padding:8px 16px;white-space:nowrap}
.has-sub .sub a:hover{background:var(--bg-alt)}

/* Hero */
.hero{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-dark) 100%);color:#fff;padding:72px 0}
.hero h1{font-size:34px;line-height:1.3;font-weight:700}
.hero-sub{margin-top:14px;font-size:17px;opacity:.92;max-width:680px}
.hero-cta{margin-top:26px;display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:11px 24px;border-radius:8px;font-size:15px;font-weight:600;transition:.2s}
.btn:hover{background:var(--brand-dark)}
.btn-ghost{background:transparent;border:1px solid #fff;color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}

/* 区块 */
.section{padding:56px 0}
.section-alt{background:var(--bg-alt)}
.section-title{font-size:26px;margin-bottom:24px;position:relative;padding-left:14px}
.section-title:before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:4px;background:var(--brand);border-radius:2px}
.cat-desc{color:var(--muted);margin-bottom:20px}
.more{margin-top:18px}
.more a{color:var(--brand);font-weight:600}

/* 卡片网格 */
.card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.2s;background:#fff}
.card:hover{box-shadow:0 10px 28px rgba(8,98,195,.12);transform:translateY(-3px)}
.card img{width:100%;aspect-ratio:16/10;object-fit:cover}
.card-body{padding:14px 16px}
.card-body h3{font-size:17px;margin-bottom:6px}
.card-body p{color:var(--muted);font-size:14px}
.price{color:var(--brand);font-weight:700;margin-top:8px}

/* 特性 */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.feature{border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:#fff}
.feature h3{color:var(--brand);margin-bottom:10px}
.feature p{color:var(--muted);font-size:14px}

/* 新闻列表 */
.news-list{list-style:none}
.news-list li{display:flex;align-items:center;gap:14px;padding:14px 0;border-bottom:1px dashed var(--line)}
.news-list li a{font-size:16px;flex:1}
.news-list li a:hover{color:var(--brand)}
.news-list time{color:var(--muted);font-size:13px;white-space:nowrap}
.news-list-full li{flex-wrap:wrap}
.news-list-full .summary{width:100%;color:var(--muted);font-size:14px}

/* 文章 / 内容 */
.article,.product{padding-top:40px}
.crumb{color:var(--muted);font-size:14px;margin-bottom:14px}
.crumb a:hover{color:var(--brand)}
.meta{color:var(--muted);font-size:14px;margin:10px 0 18px}
.cover{width:100%;border-radius:var(--radius);margin-bottom:20px}
.content{font-size:16px;line-height:1.9;color:#374151}
.content h2,.content h3{margin:22px 0 10px;color:var(--ink)}
.content p{margin-bottom:14px}
.content img{max-width:100%;border-radius:8px;margin:10px 0}
.related{margin-top:36px;border-top:1px solid var(--line);padding-top:20px}
.related ul{list-style:none}
.related li{padding:6px 0}
.related a:hover{color:var(--brand)}

/* 产品详情 */
.product-head{display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:start;margin-bottom:28px}
.product-media img{border-radius:var(--radius);width:100%}
.product-info h1{font-size:26px}
.product-info .price{font-size:24px;color:var(--brand);font-weight:700;margin:12px 0}
.product-info .summary{color:var(--muted);margin-bottom:18px}

/* 分页 */
.pager{margin-top:24px;text-align:center;color:var(--muted)}
.pager a{padding:6px 12px;border:1px solid var(--line);border-radius:6px;margin:0 3px;display:inline-block}
.pager a:hover{border-color:var(--brand);color:var(--brand)}
.pager span{margin:0 3px}

/* 联系表单 */
.contact-form{max-width:560px;margin-top:18px}
.field{margin-bottom:16px}
.field label{display:block;margin-bottom:6px;font-weight:600;font-size:14px}
.field input,.field textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit;font-size:15px}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--brand)}
.req{color:#e23b3b}
.alert{background:#e8f4ff;border:1px solid var(--brand);color:var(--brand-dark);padding:10px 14px;border-radius:8px;margin-bottom:16px}
.contact-meta{margin-top:28px;color:var(--muted)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

/* 页脚 */
.site-footer{background:#0f1f33;color:#cbd5e1;padding:40px 0 18px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:24px}
.site-footer h3{color:#fff;margin-bottom:10px}
.site-footer h4{color:#fff;margin-bottom:10px}
.site-footer a{color:#93c5fd}
.site-footer a:hover{text-decoration:underline}
.copyright{border-top:1px solid rgba(255,255,255,.1);margin-top:24px;padding-top:14px;font-size:13px;color:#94a3b8}

/* 响应式 */
@media (max-width:980px){
  .card-grid,.feature-grid{grid-template-columns:repeat(2,1fr)}
  .product-head{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
}
@media (max-width:680px){
  .nav-toggle{display:block}
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:10px 20px}
  .nav.open{display:block}
  .nav ul{flex-direction:column;gap:0}
  .nav ul li{padding:6px 0;border-bottom:1px solid var(--line)}
  .has-sub .sub{position:static;box-shadow:none;border:0;padding-left:14px}
  .hero h1{font-size:26px}
  .card-grid,.feature-grid{grid-template-columns:1fr}
}