:root{
  --cxn-bg:#0A0E1A;
  --cxn-surface:#141B2E;
  --cxn-surface2:#1B2540;
  --cxn-violet:#7C5CFF;
  --cxn-cyan:#25E0C8;
  --cxn-gold:#F4B740;
  --cxn-text:#E8ECF5;
  --cxn-muted:#8C99B5;
  --cxn-line:#2A3550;
  --cxn-line2:#CBD5E1;
  --cxn-maxw:1200px;
  --cxn-pad:24px;
  --cxn-header-h:64px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--cxn-bg);color:var(--cxn-text);
  font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;
  line-height:1.75;font-size:16px;
}
a{color:var(--cxn-cyan);text-decoration:none;}
a:hover{color:var(--cxn-gold);}
img{max-width:100%;}

/* ===== Header ===== */
.cxn-header{position:fixed;top:0;left:0;right:0;height:var(--cxn-header-h);z-index:50;
  background:rgba(10,14,26,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--cxn-line);}
.cxn-header-inner{max-width:var(--cxn-maxw);margin:0 auto;height:100%;padding:0 var(--cxn-pad);
  display:flex;align-items:center;gap:18px;}
.cxn-logo{font-weight:800;font-size:19px;color:var(--cxn-text);letter-spacing:.5px;
  background:linear-gradient(90deg,var(--cxn-violet),var(--cxn-cyan));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;white-space:nowrap;}
.cxn-nav-toggle{display:none;background:none;border:1px solid var(--cxn-line);color:var(--cxn-text);font-size:20px;border-radius:8px;width:40px;height:40px;cursor:pointer;}
.cxn-nav{display:flex;align-items:center;gap:4px;margin-left:auto;flex-wrap:wrap;}
.cxn-nav-item{position:relative;}
.cxn-nav-link{display:inline-block;padding:10px 14px;color:var(--cxn-muted);font-size:15px;border-radius:8px;transition:.2s;}
.cxn-nav-link:hover,.cxn-nav-link.active{color:var(--cxn-text);background:var(--cxn-surface2);}
.cxn-nav-sub{position:absolute;top:100%;left:0;min-width:180px;background:var(--cxn-surface);
  border:1px solid var(--cxn-line);border-radius:10px;padding:8px;display:none;flex-direction:column;z-index:60;box-shadow:0 12px 30px rgba(0,0,0,.4);}
.cxn-nav-item:hover .cxn-nav-sub,.cxn-nav-item:focus-within .cxn-nav-sub{display:flex;}
.cxn-nav-sub a{padding:8px 12px;color:var(--cxn-muted);border-radius:6px;font-size:14px;}
.cxn-nav-sub a:hover{background:var(--cxn-surface2);color:var(--cxn-text);}

/* ===== Breadcrumb ===== */
.cxn-breadcrumb{background:var(--cxn-surface);border-bottom:1px solid var(--cxn-line);}
.cxn-breadcrumb-inner{max-width:var(--cxn-maxw);margin:0 auto;padding:12px var(--cxn-pad);
  font-size:13.5px;color:var(--cxn-muted);display:flex;align-items:center;flex-wrap:wrap;}
.cxn-breadcrumb-inner a{color:var(--cxn-muted);}
.cxn-breadcrumb-inner a:hover{color:var(--cxn-cyan);}
.cxn-cur{color:var(--cxn-text);}
.cxn-sep{margin:0 8px;color:var(--cxn-line);}

/* ===== Main / Container ===== */
.cxn-main{padding:28px 0 56px;}
.cxn-container{max-width:var(--cxn-maxw);margin:0 auto;padding:0 var(--cxn-pad);}

/* ===== Detail grid (article / product) ===== */
.cxn-detail-grid{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:42px;align-items:start;}
.cxn-content-main{min-width:0;}
.cxn-toc-aside{min-width:0;}
.cxn-toc-panel{position:sticky;top:calc(var(--cxn-header-h) + 20px);max-height:calc(100vh - 100px);overflow:auto;
  background:var(--cxn-surface);border:1px solid var(--cxn-line);border-radius:12px;padding:14px 16px;}
.cxn-toc-panel summary{cursor:pointer;font-weight:700;color:var(--cxn-text);margin-bottom:8px;list-style:none;}
.cxn-toc-panel summary::-webkit-details-marker{display:none;}
.cxn-toc-panel summary::after{content:"▾";float:right;color:var(--cxn-cyan);}
.cxn-toc-body ol{margin:0;padding-left:18px;}
.cxn-toc-body li{margin:6px 0;font-size:14px;}
.cxn-toc-body a{color:var(--cxn-muted);}
.cxn-toc-body a:hover{color:var(--cxn-cyan);}

/* ===== Headings ===== */
.cxn-h1{font-size:30px;line-height:1.3;margin:0 0 20px;color:var(--cxn-text);
  background:linear-gradient(90deg,#fff,var(--cxn-cyan));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.cxn-content-main h2{font-size:22px;margin:34px 0 14px;padding-left:12px;border-left:4px solid var(--cxn-violet);color:var(--cxn-text);scroll-margin-top:84px;}
.cxn-content-main h3{font-size:18px;margin:24px 0 10px;color:var(--cxn-cyan);scroll-margin-top:84px;}
.cxn-content-main p{margin:12px 0;color:#D6DEEC;}
.cxn-content-main ul,.cxn-content-main ol{padding-left:22px;margin:12px 0;}
.cxn-content-main li{margin:7px 0;color:#D6DEEC;}
.cxn-content-main blockquote{margin:16px 0;padding:14px 18px;background:var(--cxn-surface);
  border-left:4px solid var(--cxn-gold);border-radius:0 10px 10px 0;color:#E8ECF5;}
.cxn-content-main code{background:var(--cxn-surface2);padding:2px 6px;border-radius:5px;font-size:14px;color:var(--cxn-gold);}

/* ===== Tables (M26: cover all content tables) ===== */
.cxn-spec, .cxn-content-main table, .cxn-page-main table{
  border-collapse:collapse;width:100%;margin:16px 0;font-size:14.5px;background:var(--cxn-surface);}
.cxn-spec th,.cxn-content-main table th,.cxn-page-main table th{
  background:linear-gradient(90deg,var(--cxn-violet),#5a3fd6);color:#fff;font-weight:700;
  text-align:left;padding:10px 14px;border:1px solid var(--cxn-line2);}
.cxn-spec td,.cxn-content-main table td,.cxn-page-main table td{
  padding:9px 14px;border:1px solid var(--cxn-line2);color:#D6DEEC;}
.cxn-spec tbody tr:nth-child(even),.cxn-content-main table tbody tr:nth-child(even),
.cxn-page-main table tbody tr:nth-child(even){background:rgba(124,92,255,.08);}

/* ===== Case / FAQ ===== */
.cxn-case{margin:22px 0;padding:16px 20px;background:rgba(36,224,200,.08);
  border:1px solid rgba(36,224,200,.35);border-radius:12px;}
.cxn-case-h{font-size:18px;color:var(--cxn-cyan);margin:0 0 8px;}
.cxn-faq{margin:28px 0;}
.cxn-faq-h{font-size:22px;color:var(--cxn-text);margin:0 0 12px;padding-left:12px;border-left:4px solid var(--cxn-gold);}
.cxn-content-main details{border:1px solid var(--cxn-line);border-radius:10px;margin:10px 0;background:var(--cxn-surface);}
.cxn-content-main details summary{cursor:pointer;padding:13px 16px;font-weight:600;color:var(--cxn-text);list-style:none;}
.cxn-content-main details summary::-webkit-details-marker{display:none;}
.cxn-content-main details summary::after{content:"+";float:right;color:var(--cxn-cyan);font-weight:800;}
.cxn-content-main details[open] summary::after{content:"−";}
.cxn-content-main details > div{padding:0 16px 14px;color:#D6DEEC;}

/* ===== Product meta ===== */
.cxn-prod-meta{font-size:13.5px;color:var(--cxn-muted);background:var(--cxn-surface);
  display:inline-block;padding:6px 12px;border-radius:20px;border:1px solid var(--cxn-line);}

/* ===== List layout ===== */
.cxn-list-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:32px;align-items:start;}
.cxn-cat-side{min-width:0;}
.cxn-cat-panel{background:var(--cxn-surface);border:1px solid var(--cxn-line);border-radius:12px;padding:14px 16px;position:sticky;top:calc(var(--cxn-header-h) + 20px);}
.cxn-cat-panel summary{cursor:pointer;font-weight:700;list-style:none;margin-bottom:6px;}
.cxn-cat-panel summary::-webkit-details-marker{display:none;}
.cxn-cat-panel summary::after{content:"▾";float:right;color:var(--cxn-cyan);}
.cxn-category-list{list-style:none;margin:0;padding:0;}
.cxn-cat-link{display:flex;justify-content:space-between;align-items:center;padding:9px 12px;border-radius:8px;color:var(--cxn-muted);font-size:14.5px;}
.cxn-cat-link:hover,.cxn-cat-link.active{background:var(--cxn-surface2);color:var(--cxn-text);}
.cxn-cat-count{font-size:12px;background:var(--cxn-bg);padding:1px 8px;border-radius:10px;color:var(--cxn-cyan);}
.cxn-cat-content{min-width:0;}
.cxn-cat-intro{color:var(--cxn-muted);margin:6px 0 22px;}
.cxn-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;}
.cxn-card{display:block;background:var(--cxn-surface);border:1px solid var(--cxn-line);border-radius:14px;padding:18px 20px;transition:.2s;}
.cxn-card:hover{border-color:var(--cxn-violet);transform:translateY(-3px);box-shadow:0 10px 26px rgba(124,92,255,.18);}
.cxn-card-cat{font-size:12px;color:var(--cxn-cyan);}
.cxn-card-title{font-size:17px;margin:8px 0 6px;color:var(--cxn-text);}
.cxn-card-summary{font-size:14px;color:var(--cxn-muted);margin:0;line-height:1.6;}

/* ===== Page wrap ===== */
.cxn-page-wrap{max-width:860px;margin:0 auto;}
.cxn-page-main{min-width:0;}
.cxn-page-main h2{font-size:22px;margin:30px 0 12px;padding-left:12px;border-left:4px solid var(--cxn-violet);color:var(--cxn-text);}
.cxn-page-main h3{font-size:18px;margin:22px 0 10px;color:var(--cxn-cyan);}
.cxn-page-main p{color:#D6DEEC;}

/* ===== Home ===== */
.cxn-hero{background:radial-gradient(1200px 400px at 70% -10%,rgba(124,92,255,.25),transparent),var(--cxn-surface);border-bottom:1px solid var(--cxn-line);}
.cxn-hero-inner{max-width:var(--cxn-maxw);margin:0 auto;padding:56px var(--cxn-pad);display:grid;grid-template-columns:1.1fr .9fr;gap:30px;align-items:center;}
.cxn-hero-kicker{color:var(--cxn-cyan);font-weight:700;letter-spacing:1px;font-size:14px;margin:0 0 10px;}
.cxn-hero-title{font-size:42px;margin:0 0 16px;background:linear-gradient(90deg,#fff,var(--cxn-violet),var(--cxn-cyan));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;}
.cxn-hero-sub{color:var(--cxn-muted);font-size:16.5px;max-width:560px;}
.cxn-hero-cta{margin-top:24px;display:flex;gap:14px;flex-wrap:wrap;}
.cxn-btn{display:inline-block;padding:12px 22px;border-radius:30px;font-weight:700;font-size:15px;transition:.2s;}
.cxn-btn-primary{background:linear-gradient(90deg,var(--cxn-violet),var(--cxn-cyan));color:#08101f;}
.cxn-btn-primary:hover{filter:brightness(1.1);color:#08101f;}
.cxn-btn-ghost{border:1px solid var(--cxn-line);color:var(--cxn-text);}
.cxn-btn-ghost:hover{border-color:var(--cxn-cyan);color:var(--cxn-cyan);}
.cxn-hero-wave svg{width:100%;height:auto;}
.cxn-wave{fill:none;stroke-width:2.5;}
.cxn-wave-a{stroke:var(--cxn-violet);opacity:.9;}
.cxn-wave-b{stroke:var(--cxn-cyan);opacity:.7;}
.cxn-wave-c{stroke:var(--cxn-gold);opacity:.6;}

.cxn-section{padding:48px 0;}
.cxn-section-alt{background:var(--cxn-surface);}
.cxn-section-head{text-align:center;margin-bottom:30px;}
.cxn-section-title{font-size:28px;margin:0 0 8px;color:var(--cxn-text);}
.cxn-section-desc{color:var(--cxn-muted);margin:0;}
.cxn-product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px;}
.cxn-product-card{background:var(--cxn-surface);border:1px solid var(--cxn-line);border-radius:14px;padding:20px;}
.cxn-product-card-title{font-size:18px;margin:0 0 8px;color:var(--cxn-cyan);}
.cxn-product-card-desc{color:var(--cxn-muted);margin:0;font-size:14.5px;}
.cxn-keyword-cloud{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;}
.cxn-keyword{background:var(--cxn-surface2);border:1px solid var(--cxn-line);color:var(--cxn-text);padding:8px 16px;border-radius:20px;font-size:14.5px;}
.cxn-baseline{max-width:620px;margin:0 auto;}
.cxn-baseline-note{margin-top:16px;color:var(--cxn-muted);background:var(--cxn-surface);padding:14px 18px;border-radius:10px;border-left:4px solid var(--cxn-gold);}
.cxn-scene-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;}
.cxn-scene-card{background:var(--cxn-surface);border:1px solid var(--cxn-line);border-radius:14px;padding:20px;}
.cxn-scene-title{font-size:17px;margin:0 0 8px;color:var(--cxn-text);}
.cxn-scene-desc{color:var(--cxn-muted);margin:0;font-size:14.5px;}
.cxn-cta-band{text-align:center;background:linear-gradient(90deg,rgba(124,92,255,.15),rgba(36,224,200,.12));border-top:1px solid var(--cxn-line);border-bottom:1px solid var(--cxn-line);}
.cxn-cta-title{font-size:26px;margin:0 0 10px;color:var(--cxn-text);}
.cxn-cta-sub{color:var(--cxn-muted);margin:0 0 20px;}

/* ===== Archive ===== */
.cxn-archive-h2{font-size:24px;margin:34px 0 12px;color:var(--cxn-text);}
.cxn-archive-cat{font-size:18px;color:var(--cxn-cyan);margin:18px 0 8px;}
.cxn-archive-list{columns:2;column-gap:30px;}
.cxn-archive-list li{margin:6px 0;break-inside:avoid;}

/* ===== 404 ===== */
.cxn-404{text-align:center;padding:40px 0;}
.cxn-404-text{color:var(--cxn-muted);}
.cxn-404-cta{margin-top:20px;display:flex;gap:14px;justify-content:center;}

/* ===== Float capsule ===== */
.cxn-float{position:fixed;right:22px;top:50%;transform:translateY(-50%);z-index:70;
  display:flex;flex-direction:column;gap:10px;padding:10px 8px;border-radius:30px;
  background:linear-gradient(180deg,var(--cxn-violet),var(--cxn-cyan));box-shadow:0 10px 30px rgba(36,224,200,.35);}
.cxn-float-btn{display:flex;flex-direction:column;align-items:center;gap:2px;width:46px;padding:8px 0;border:none;background:transparent;color:#08101f;cursor:pointer;font-size:11px;font-weight:700;}
.cxn-float-ico{font-size:18px;line-height:1;}
.cxn-float-btn:hover{color:#fff;}

/* ===== WeChat card popup ===== */
.cxn-card-mask{position:fixed;inset:0;background:rgba(5,8,16,.78);z-index:90;display:flex;align-items:center;justify-content:center;}
.cxn-card-mask[hidden]{display:none;}
.cxn-card-pop{position:relative;background:#fff;border-radius:12px;padding:10px;box-shadow:0 20px 50px rgba(0,0,0,.5);}
.cxn-card-img{display:block;width:300px;height:500px;object-fit:contain;background:#fff;border-radius:6px;}
.cxn-card-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;border:none;background:var(--cxn-violet);color:#fff;font-size:20px;cursor:pointer;box-shadow:0 4px 12px rgba(0,0,0,.4);}

/* ===== Footer ===== */
.cxn-footer{background:var(--cxn-surface);border-top:1px solid var(--cxn-line);margin-top:40px;}
.cxn-footer-inner{max-width:var(--cxn-maxw);margin:0 auto;padding:40px var(--cxn-pad);}
.cxn-footer-cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px;}
.cxn-foot-h{font-size:16px;color:var(--cxn-text);margin:0 0 12px;}
.cxn-foot-p{color:var(--cxn-muted);font-size:14px;margin:0;}
.cxn-foot-link{display:block;color:var(--cxn-muted);font-size:14px;padding:4px 0;}
.cxn-foot-link:hover{color:var(--cxn-cyan);}
.cxn-footer-bottom{margin-top:30px;padding-top:20px;border-top:1px solid var(--cxn-line);color:var(--cxn-muted);font-size:13px;text-align:center;}

/* ===== Responsive folding (breakpoint 1024) ===== */
@media (max-width:1024px){
  .cxn-nav-toggle{display:block;}
  .cxn-nav{display:none;position:absolute;top:var(--cxn-header-h);left:0;right:0;flex-direction:column;
    background:var(--cxn-surface);border-bottom:1px solid var(--cxn-line);padding:10px;gap:2px;}
  .cxn-nav.open{display:flex;}
  .cxn-nav-item{width:100%;}
  .cxn-nav-sub{position:static;display:flex;box-shadow:none;border:none;background:var(--cxn-bg);margin-top:4px;padding-left:10px;}
  .cxn-detail-grid{grid-template-columns:1fr;}
  .cxn-toc-aside{order:-1;}
  .cxn-toc-panel{position:static;max-height:none;margin-bottom:20px;}
  .cxn-list-layout{grid-template-columns:1fr;}
  .cxn-cat-side{order:-1;}
  .cxn-cat-panel{position:static;margin-bottom:20px;}
  .cxn-hero-inner{grid-template-columns:1fr;}
  .cxn-hero-wave{display:none;}
  .cxn-archive-list{columns:1;}
  .cxn-footer-cols{grid-template-columns:1fr;}
  .cxn-hero-title{font-size:32px;}
}