:root{
  --h2-inset:16px;
  --nav-h:64px;
  --maxw:1160px;
  --ink:#0f1b2d;
  --ink-2:#33425a;
  --muted:#6b7a90;
  --line:#e3e9f2;
  --bg:#ffffff;
  --bg-soft:#f4f7fb;
  --brand:#0b6cff;
  --brand-2:#00c2c7;
  --brand-grad:linear-gradient(120deg,#0b6cff 0%,#00c2c7 100%);
  --accent:#0a2540;
  --shadow:0 10px 30px rgba(15,27,45,.08);
  --radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px;
  padding-top:var(--nav-h);
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
h1,h2,h3,h4{line-height:1.35;color:var(--accent)}

/* ===== 顶部导航 ===== */
.site-header{position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:50;
  background:rgba(255,255,255,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{height:var(--nav-h);display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--accent);font-size:18px}
.brand-mark{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;
  background:var(--brand-grad);color:#fff;font-size:16px}
.main-nav{margin-left:auto;display:flex;gap:22px}
.main-nav a{color:var(--ink-2);font-weight:600;font-size:15px}
.main-nav a:hover{color:var(--brand);text-decoration:none}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);
  border-radius:10px;width:42px;height:38px;font-size:18px;cursor:pointer;color:var(--accent)}

/* ===== 面包屑 ===== */
.breadcrumb{padding-left:var(--h2-inset);margin:18px 0 6px;font-size:13.5px;color:var(--muted)}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.breadcrumb li{display:flex;align-items:center}
.breadcrumb li:not(:last-child)::after{content:"›";margin:0 6px;color:var(--line)}
.breadcrumb a{color:var(--muted)}
.breadcrumb [aria-current]{color:var(--ink-2);font-weight:600}

/* ===== 文章布局 ===== */
.article-layout{padding-bottom:48px}
.article-grid{display:flex;gap:32px;align-items:flex-start}
.article-body{flex:1 1 auto;max-width:760px;min-width:0;padding-left:var(--h2-inset)}
.article-body h1{font-size:30px;margin:6px 0 16px}
.article-body h2{font-size:22px;margin:34px 0 12px;padding-bottom:8px;border-bottom:2px solid var(--line)}
.article-body h3{font-size:18px;margin:24px 0 10px}
.article-body p{margin:0 0 14px}
.article-body ul,.article-body ol{padding-left:22px;margin:0 0 14px}
.article-body li{margin:6px 0}
.article-body blockquote{margin:14px 0;padding:10px 16px;border-left:4px solid var(--brand-2);
  background:var(--bg-soft);color:var(--ink-2);border-radius:0 8px 8px 0}
.summary-box{position:relative;background:linear-gradient(120deg,#eef4ff,#e9fbfb);
  border:1px solid #d7e6ff;border-radius:12px;padding:16px 18px 16px 18px;margin:0 0 18px;color:var(--ink-2)}
.summary-box .sb-tag{display:inline-block;font-size:12px;font-weight:700;color:#fff;
  background:var(--brand-grad);border-radius:6px;padding:2px 8px;margin-bottom:8px}
.kw-line{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 18px;font-size:13px}
.kw-label{color:var(--muted);font-weight:600}
.tag-text{background:var(--bg-soft);border:1px solid var(--line);border-radius:999px;
  padding:3px 10px;color:var(--ink-2);font-size:12.5px}
table.data{width:100%;border-collapse:collapse;margin:14px 0 18px;font-size:14.5px;
  background:#fff;box-shadow:var(--shadow);border-radius:10px;overflow:hidden}
table.data th,table.data td{border:1px solid var(--line);padding:10px 12px;text-align:left}
table.data th{background:var(--accent);color:#fff;font-weight:600}
table.data tr:nth-child(even) td{background:var(--bg-soft)}

/* FAQ */
.faq{margin:30px 0 10px}
.faq-h{font-size:20px;margin:0 0 12px}
.faq details{border:1px solid var(--line);border-radius:10px;margin:0 0 10px;background:#fff;overflow:hidden}
.faq summary{cursor:pointer;padding:13px 16px;font-weight:600;color:var(--accent);list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";display:inline-block;width:20px;color:var(--brand);font-weight:800}
.faq details[open] summary::before{content:"−"}
.faq details p{margin:0;padding:0 16px 14px;color:var(--ink-2)}

/* 相关阅读 */
.related{margin-top:30px;border-top:1px dashed var(--line);padding-top:18px}
.related-h{font-size:19px;margin:0 0 12px}
.related-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.related-list a{display:block;background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;
  padding:12px 14px;color:var(--ink-2);font-weight:600}
.related-list a:hover{border-color:var(--brand);text-decoration:none;color:var(--brand)}

/* TOC */
.toc-aside{position:sticky;top:calc(var(--nav-h) + 16px);flex:0 0 240px;max-height:calc(100vh - 100px);
  overflow-y:auto;align-self:flex-start}
.toc-aside #toc{background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.toc-title{margin:0 0 10px;font-size:14px;color:var(--muted);font-weight:700;letter-spacing:.04em}
.toc-aside ul{list-style:none;margin:0;padding:0}
.toc-aside li a{display:block;padding:5px 0;color:var(--ink-2);font-size:14px;border-left:2px solid transparent;padding-left:10px}
.toc-aside li.lvl-3 a{padding-left:22px;font-size:13px;color:var(--muted)}
.toc-aside li a:hover{border-left-color:var(--brand);color:var(--brand);text-decoration:none}

/* ===== 产品 ===== */
.product-body .prod-summary{background:var(--bg-soft);border-radius:12px;padding:14px 16px;color:var(--ink-2);margin:0 0 18px}

/* ===== 列表页 ===== */
.list-layout{padding:8px 24px 48px}
.list-grid{display:flex;gap:32px;align-items:flex-start}
.cat-side{flex:0 0 220px;position:sticky;top:calc(var(--nav-h) + 16px)}
.cat-side-title{font-size:13px;color:var(--muted);font-weight:700;margin:8px 0 10px;padding-left:14px}
.category-list{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.category-list li a{display:block;padding:10px 14px;color:var(--ink-2);font-weight:600;border-left:2px solid transparent;margin-left:-2px}
.category-list li a:hover,.category-list li.active a{color:var(--brand);border-left-color:var(--brand);text-decoration:none;background:#fff}
.cat-content{flex:1 1 auto;min-width:0}
.cat-content h1{font-size:26px;margin:8px 0 6px}
.list-desc{color:var(--muted);margin:0 0 18px}
.list-items{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.list-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;box-shadow:var(--shadow)}
.li-title{display:block;font-size:17px;font-weight:700;color:var(--accent)}
.li-desc{display:block;color:var(--muted);font-size:14px;margin-top:6px}
.empty-tip{color:var(--muted)}

/* ===== 页面（叶子）===== */
.page-wrap{max-width:860px;--h2-inset:48px;padding:8px 24px 48px}
.page-wrap .breadcrumb{padding-left:var(--h2-inset)}
.page-body{padding-left:var(--h2-inset)}
.page-body h1{font-size:28px;margin:6px 0 16px}
.page-body h2{font-size:21px;margin:28px 0 10px;border-bottom:2px solid var(--line);padding-bottom:6px}
.page-body h3{font-size:17px;margin:20px 0 8px}

/* ===== 首页 ===== */
.hero{position:relative;overflow:hidden;background:radial-gradient(120% 120% at 80% -10%,#0a2540 0%,#0b1b34 55%,#07101f 100%);color:#eaf2ff}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),
  linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);background-size:46px 46px;
  mask-image:radial-gradient(120% 120% at 70% 0%,#000 30%,transparent 75%)}
.hero-inner{position:relative;padding:72px 24px 56px;max-width:var(--maxw);margin:0 auto}
.hero-eyebrow{display:inline-block;color:#9fe9ec;font-weight:700;letter-spacing:.05em;font-size:14px;
  border:1px solid rgba(159,233,236,.4);border-radius:999px;padding:5px 14px;margin:0 0 18px}
.hero-title{font-size:40px;line-height:1.25;margin:0 0 16px;color:#fff;font-weight:800}
.hero-sub{font-size:17px;color:#c4d4ee;max-width:760px;margin:0 0 26px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:34px}
.btn-primary{display:inline-block;background:var(--brand-grad);color:#fff;font-weight:700;
  padding:13px 26px;border-radius:999px;box-shadow:0 12px 26px rgba(11,108,255,.35)}
.btn-primary:hover{text-decoration:none;filter:brightness(1.05)}
.btn-ghost{display:inline-block;border:1px solid rgba(255,255,255,.4);color:#eaf2ff;font-weight:700;
  padding:13px 26px;border-radius:999px}
.btn-ghost:hover{text-decoration:none;border-color:#fff}
.hero-stats{display:flex;flex-wrap:wrap;gap:30px;list-style:none;margin:0;padding:0}
.hero-stats li{display:flex;flex-direction:column}
.hero-stats b{font-size:26px;color:#7fe3e7;font-weight:800}
.hero-stats span{font-size:13px;color:#a9bdda}

.section{padding:52px 24px}
.section.alt{background:var(--bg-soft)}
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:22px}
.section-head h2{font-size:26px;margin:0}
.section-head .more{font-weight:700;color:var(--brand)}
.prod-cats{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-bottom:26px}
.prod-cat{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:16px;font-weight:700;color:var(--accent);box-shadow:var(--shadow)}
.prod-cat:hover{text-decoration:none;border-color:var(--brand);color:var(--brand)}
.pc-ico{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--brand-grad);color:#fff}
.home-products{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;list-style:none;margin:0;padding:0}
.hp-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow)}
.hp-card:hover{transform:translateY(-3px);transition:.2s;border-color:var(--brand)}
.hp-card h3{font-size:17px;margin:0 0 8px}
.hp-card p{margin:0;color:var(--muted);font-size:14px}
.art-cats{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px}
.art-cat{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-weight:600;color:var(--ink-2)}
.art-cat:hover{text-decoration:none;border-color:var(--brand);color:var(--brand)}
.home-articles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;list-style:none;margin:0;padding:0}
.ha-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow)}
.ha-card:hover{transition:.2s;border-color:var(--brand-2)}
.ha-cat{display:inline-block;font-size:12px;color:var(--brand);background:#e7f0ff;border-radius:6px;padding:2px 8px;margin-bottom:8px}
.ha-card h3{font-size:16px;margin:0 0 8px;color:var(--accent)}
.ha-card p{margin:0;color:var(--muted);font-size:13.5px}
.cap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.cap{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow)}
.cap h3{font-size:18px;margin:0 0 8px}
.cap p{margin:0;color:var(--muted);font-size:14px}
.cta-band{text-align:center;background:var(--brand-grad);color:#fff;border-radius:18px;margin:0 auto 52px;max-width:var(--maxw)}
.cta-band h2{color:#fff;font-size:26px;margin:0 0 10px}
.cta-band p{color:#eaf6ff;max-width:640px;margin:0 auto 18px}
.cta-band .btn-primary{background:#fff;color:var(--brand)}

/* ===== 悬浮工具 ===== */
.float-tools{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;
  display:flex;flex-direction:column;gap:12px}
.ft-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  width:60px;height:60px;border:none;border-radius:999px;cursor:pointer;color:#fff;
  background:var(--brand-grad);box-shadow:0 10px 24px rgba(11,108,255,.4);font-weight:700}
.ft-btn:hover{filter:brightness(1.06)}
.ft-top{background:linear-gradient(120deg,#0a2540,#0b6cff)}
.ft-ico{font-size:20px;line-height:1}
.ft-txt{font-size:11px}

/* 微信名片弹窗 */
.wechat-modal{position:fixed;inset:0;z-index:80;display:flex;align-items:center;justify-content:center;
  background:rgba(7,16,31,.6);backdrop-filter:blur(4px);padding:16px;overflow:auto}
.wechat-modal[hidden]{display:none}
.wechat-card{position:relative;background:#fff;border-radius:14px;padding:10px;box-shadow:var(--shadow);text-align:center;
  max-width:min(92vw,300px)}
.wechat-close{position:absolute;top:-10px;right:-10px;width:30px;height:30px;border-radius:50%;border:none;
  background:#0a2540;color:#fff;font-size:18px;cursor:pointer;line-height:1}
.wechat-card img{display:block;width:auto;height:auto;max-width:100%;max-height:min(56vh,380px);object-fit:contain;margin:0 auto;border-radius:8px}
.wechat-tip{margin:8px 0 2px;color:var(--muted);font-size:12px}

/* ===== 页脚 ===== */
.site-footer{background:#0a1828;color:#c4d4ee;margin-top:30px;padding:42px 0 0}
.footer-grid{max-width:var(--maxw);margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:24px}
.site-footer h3{color:#fff;font-size:18px;margin:0 0 8px}
.site-footer h4{color:#9fe9ec;font-size:14px;margin:0 0 12px}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.site-footer a{color:#c4d4ee}
.site-footer a:hover{color:#fff}
.footer-bottom{max-width:var(--maxw);margin:28px auto 0;padding:16px 24px;border-top:1px solid rgba(255,255,255,.1);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#8aa0c2}

/* ===== 响应式 ===== */
@media (max-width:980px){
  .article-grid{flex-direction:column}
  .toc-aside{position:static;flex:none;max-height:none;width:100%;margin-top:20px}
  .home-products,.home-articles,.cap-grid{grid-template-columns:repeat(2,1fr)}
  .prod-cats{grid-template-columns:repeat(2,1fr)}
  .list-grid{flex-direction:column}
  .cat-side{position:static;flex:none;width:100%}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:680px){
  .nav-toggle{display:block}
  .main-nav{display:none;position:absolute;top:var(--nav-h);left:0;right:0;flex-direction:column;
    background:#fff;border-bottom:1px solid var(--line);padding:10px 24px;gap:4px}
  .main-nav.open{display:flex}
  .hero-title{font-size:28px}
  .home-products,.home-articles,.cap-grid,.prod-cats{grid-template-columns:1fr}
  .article-body{max-width:100%}
  .float-tools{right:10px}
  .ft-btn{width:52px;height:52px}
}