:root{
  --bg:#0a1424; --surface:#0f1f3d; --panel:#12233f; --panel-2:#16305a;
  --accent:#2f80ed; --accent-2:#00d4ff; --accent-grad:linear-gradient(120deg,#2f80ed,#00d4ff);
  --text:#e8eefb; --muted:#9fb2cc; --line:rgba(255,255,255,.09);
  --radius:14px; --maxw:1200px; --h2-inset:16px;
  --header-h:64px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:"PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased;
}
a{color:var(--accent-2);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
h1,h2,h3,h4{line-height:1.3;font-weight:700}
.container{max-width:var(--maxw);margin:0 auto;padding:0 16px}

/* ===== Header ===== */
.site-header{position:fixed;top:0;left:0;right:0;height:var(--header-h);z-index:50;
  background:rgba(10,20,36,.82);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;height:100%;padding:0 16px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;color:var(--text)}
.brand img{border-radius:8px;display:block}
.brand-name{font-weight:800;font-size:18px;letter-spacing:.5px}
.brand-sub{color:var(--muted);font-size:12px;border-left:1px solid var(--line);padding-left:10px}
.main-nav .nav-list{display:flex;gap:6px;list-style:none;margin:0;padding:0;align-items:center}
.nav-item{position:relative}
.nav-link{display:inline-flex;align-items:center;gap:4px;padding:8px 12px;border-radius:8px;color:var(--text);font-size:15px}
.nav-link:hover{background:var(--panel);text-decoration:none}
.caret{width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid var(--muted)}
.sub-nav{position:absolute;top:100%;left:0;min-width:180px;background:var(--surface);border:1px solid var(--line);
  border-radius:10px;padding:8px;display:none;flex-direction:column;gap:2px;box-shadow:0 12px 30px rgba(0,0,0,.4);z-index:60}
.has-sub:hover .sub-nav{display:flex}
.sub-nav a{padding:7px 10px;border-radius:6px;color:var(--text);font-size:14px}
.sub-nav a:hover{background:var(--panel-2);text-decoration:none}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:var(--text);display:block;border-radius:2px}
body.nav-open .main-nav{display:block}

/* ===== Breadcrumb (aligned to H2 left edge) ===== */
.breadcrumb{padding-top:calc(var(--header-h) + 16px);padding-bottom:8px}
.breadcrumb-list{list-style:none;display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin:0;padding:0;font-size:13px;color:var(--muted)}
.breadcrumb .crumb a{color:var(--muted)}
.breadcrumb .crumb a:hover{color:var(--accent-2)}
.crumb-sep{color:var(--line)}
.crumb.current{color:var(--text)}

/* ===== Article / Product layout ===== */
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:36px;padding-bottom:60px}
.article-main{min-width:0}
.article-title{font-size:30px;margin:4px 0 6px}
.update-time{color:var(--muted);font-size:13px;margin:0 0 18px}
.article-body{font-size:16px}
.product-layout{display:block;padding-bottom:60px}
.product-title{font-size:28px;margin:4px 0 6px}
.product-lead{color:var(--muted);font-size:15px;margin:0 0 24px}
.article-body h2,.product-body h2,.page-body h2{font-size:22px;margin:34px 0 12px;padding-left:12px;border-left:4px solid var(--accent);scroll-margin-top:calc(var(--header-h) + 16px)}
.article-body h3,.product-body h3,.page-body h3{font-size:18px;margin:24px 0 10px;scroll-margin-top:calc(var(--header-h) + 16px)}
.article-body p,.product-body p,.page-body p{margin:0 0 14px}
.article-body ul,.article-body ol,.page-body ul,.product-body ul{padding-left:22px;margin:0 0 14px}
.article-body li,.page-body li,.product-body li{margin:6px 0}
.article-body blockquote,.page-body blockquote{background:var(--panel);border-left:4px solid var(--accent-2);margin:16px 0;padding:12px 16px;border-radius:0 10px 10px 0;color:#dbe6f7}
.article-body code,.page-body code{background:var(--panel-2);padding:2px 6px;border-radius:5px;font-size:14px}

/* ===== TOC ===== */
.toc-aside{align-self:start;position:sticky;top:calc(var(--header-h) + 16px);max-height:calc(100vh - var(--header-h) - 32px);overflow:auto}
.toc-box{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.toc-title{font-size:13px;color:var(--muted);margin:0 0 8px;text-transform:uppercase;letter-spacing:1px}
.toc-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.toc-list a{color:var(--muted);font-size:14px}
.toc-list a:hover{color:var(--accent-2);text-decoration:none}

/* ===== Tables ===== */
table.data{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px;background:var(--surface);border:1px solid var(--line);border-radius:10px;overflow:hidden}
table.data th,table.data td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
table.data thead th{background:var(--panel-2);color:#fff;font-weight:600}
table.data tbody tr:hover{background:rgba(47,128,237,.08)}

/* ===== FAQ ===== */
.faq-section{margin-top:30px}
.faq-heading{font-size:20px;margin-bottom:12px;padding-left:12px;border-left:4px solid var(--accent)}
.faq-item{background:var(--surface);border:1px solid var(--line);border-radius:10px;margin-bottom:10px;padding:0 14px}
.faq-item summary{cursor:pointer;padding:14px 0;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";color:var(--accent-2);font-size:20px}
.faq-item[open] summary::after{content:"−"}
.faq-a{padding:0 0 14px;color:#dbe6f7}

/* ===== List / Category ===== */
.list-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:32px;padding-bottom:60px}
.cat-side{align-self:start;position:sticky;top:calc(var(--header-h) + 16px)}
.category-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:10px}
.category-list a{display:block;padding:10px 12px;border-radius:8px;color:var(--text);font-size:15px}
.category-list a:hover,.category-list a.active{background:var(--panel-2);color:var(--accent-2);text-decoration:none}
.list-title{font-size:26px;margin:4px 0 18px}
.list-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px}
.list-card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px;transition:.2s}
.list-card:hover{transform:translateY(-3px);border-color:var(--accent)}
.list-card h3{font-size:17px;margin:0 0 6px}
.list-card h3 a{color:var(--text)}
.list-card .meta{color:var(--muted);font-size:12px;margin:0 0 8px}
.list-card p{color:var(--muted);font-size:14px;margin:0}

/* ===== Generic page ===== */
.page-wrap{max-width:880px;margin:0 auto;padding-bottom:60px}
.page-title{font-size:28px;margin:4px 0 18px}
.page-body{font-size:16px}
.archive-list{list-style:none;padding:0;display:grid;gap:8px}
.archive-list li{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:10px 14px}

/* ===== Home ===== */
.hero{position:relative;overflow:hidden;padding:calc(var(--header-h) + 60px) 0 70px}
.hero-bg{position:absolute;inset:0;background:
  radial-gradient(900px 500px at 80% -10%,rgba(0,212,255,.18),transparent),
  radial-gradient(700px 400px at 0% 10%,rgba(47,128,237,.22),transparent);z-index:0}
.hero-inner{position:relative;z-index:1;max-width:var(--maxw);margin:0 auto;padding:0 16px}
.hero-eyebrow{color:var(--accent-2);font-weight:600;letter-spacing:1px;margin:0 0 12px}
.hero-title{font-size:42px;line-height:1.2;margin:0 0 18px;max-width:880px}
.hero-sub{color:var(--muted);font-size:17px;max-width:760px;margin:0 0 26px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:24px}
.hero-chips{list-style:none;display:flex;flex-wrap:wrap;gap:8px;padding:0;margin:0}
.hero-chips li{background:var(--surface);border:1px solid var(--line);border-radius:999px;padding:6px 14px;font-size:13px;color:#cfe0f7}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:11px 22px;border-radius:10px;font-weight:600;font-size:15px;cursor:pointer;border:1px solid transparent}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--accent-grad);color:#03152e}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--accent)}

.section{max-width:var(--maxw);margin:0 auto;padding:54px 16px}
.section-alt{background:linear-gradient(180deg,rgba(255,255,255,.02),transparent)}
.section-head{margin-bottom:26px}
.section-head h2{font-size:28px;margin:0 0 8px}
.section-head p{color:var(--muted);margin:0;max-width:680px}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px}
.cap-card{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px;color:var(--text);transition:.2s}
.cap-card:hover{transform:translateY(-4px);border-color:var(--accent);text-decoration:none}
.cap-card h3{margin:0 0 8px;font-size:18px}
.cap-card p{color:var(--muted);font-size:14px;margin:0}
.cap-arrow{position:absolute;right:18px;bottom:18px;color:var(--accent-2);font-size:20px}
.feature-grid,.scenario-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.feature,.scenario{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:20px}
.feature h3,.scenario h3{margin:0 0 8px;font-size:17px;color:var(--accent-2)}
.feature p,.scenario p{color:var(--muted);font-size:14px;margin:0}
.more-link{margin-top:18px}
.more-link a{font-weight:600}
.cta-band{background:var(--accent-grad);color:#03152e;margin:30px 0 0}
.cta-inner{max-width:var(--maxw);margin:0 auto;padding:46px 16px;text-align:center}
.cta-inner h2{font-size:26px;margin:0 0 10px}
.cta-inner p{margin:0 0 20px;font-size:16px}
.cta-band .btn-primary{background:#03152e;color:#fff}

/* ===== Footer ===== */
.site-footer{border-top:1px solid var(--line);background:#08101e;margin-top:40px}
.footer-inner{max-width:var(--maxw);margin:0 auto;padding:40px 16px 10px;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px}
.footer-col h4{font-size:15px;margin:0 0 12px;color:#fff}
.footer-col p{color:var(--muted);font-size:14px}
.footer-col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}
.footer-col ul a{color:var(--muted);font-size:14px}
.footer-bottom{max-width:var(--maxw);margin:0 auto;padding:14px 16px 30px;color:var(--muted);font-size:13px;border-top:1px solid var(--line)}

/* ===== Floating capsule ===== */
.float-capsule{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:80;display:flex;flex-direction:column;gap:10px}
.cap-btn{width:52px;height:52px;border-radius:26px;border:1px solid var(--line);background:var(--surface);color:var(--text);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;cursor:pointer;box-shadow:0 8px 24px rgba(0,0,0,.35);transition:.2s}
.cap-btn span{font-size:10px;line-height:1}
.cap-btn:hover{border-color:var(--accent);color:var(--accent-2)}

/* ===== WeChat modal ===== */
.wechat-modal{position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center}
.wechat-modal.open{display:flex}
.wechat-modal-mask{position:absolute;inset:0;background:rgba(3,8,18,.7)}
.wechat-modal-box{position:relative;background:#fff;border-radius:14px;padding:14px;width:300px;box-shadow:0 20px 60px rgba(0,0,0,.5);text-align:center}
.wechat-modal-box img{width:300px;height:500px;object-fit:contain;display:block;border-radius:8px;background:#f3f6fb}
.wechat-close{position:absolute;top:-12px;right:-12px;width:32px;height:32px;border-radius:50%;border:0;background:var(--accent);color:#fff;font-size:20px;cursor:pointer;line-height:1}
.wechat-tip{color:#334;font-size:12px;margin:10px 0 2px}

/* ===== Related ===== */
.related-list,.scenario-list{list-style:none;padding:0;display:grid;gap:8px}
.related-list li,.scenario-list li{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:10px 14px;font-size:14px}
.related-list a{font-weight:600}

/* ===== Responsive ===== */
@media (max-width:1024px){
  .article-layout{grid-template-columns:1fr;gap:0}
  .toc-aside{display:none}
  .list-layout{grid-template-columns:1fr}
  .cat-side{position:static}
}
@media (max-width:768px){
  .nav-toggle{display:flex}
  .main-nav{display:none;position:absolute;top:var(--header-h);left:0;right:0;background:var(--bg);border-bottom:1px solid var(--line);padding:10px 16px}
  body.nav-open .main-nav{display:block}
  .main-nav .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .sub-nav{position:static;display:none;box-shadow:none;border:0;background:transparent;padding:4px 0 4px 12px}
  .has-sub.open .sub-nav{display:flex}
  .brand-sub{display:none}
  .hero-title{font-size:30px}
  .float-capsule{right:10px}
}