:root{
  --fus-bg:#0B0E14;
  --fus-bg2:#0F1420;
  --fus-panel:#161C2A;
  --fus-panel2:#1C2333;
  --fus-line:#2A3346;
  --fus-text:#E7ECF5;
  --fus-muted:#9AA6BD;
  --fus-violet:#8B5CF6;
  --fus-cyan:#22D3EE;
  --fus-amber:#F59E0B;
  --fus-radius:14px;
  --fus-maxw:1180px;
  --h2-inset:16px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:linear-gradient(180deg,#0B0E14 0%,#0D1422 100%);
  color:var(--fus-text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;
}
a{color:var(--fus-cyan);text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;}
h1,h2,h3,h4{line-height:1.35;color:#fff;font-weight:700;}
h1{font-size:30px;margin:0 0 14px;}
h2{font-size:23px;margin:34px 0 14px;padding-left:var(--h2-inset);border-left:3px solid var(--fus-violet);}
.fus-content-main h1.fus-detail-title{font-size:30px;margin:0 0 18px;padding-left:var(--h2-inset);color:#fff;}
.fus-page-main h1.fus-detail-title{font-size:30px;margin:0 0 18px;padding-left:var(--h2-inset);color:#fff;}
h3{font-size:18px;margin:24px 0 10px;padding-left:var(--h2-inset);}
p{margin:0 0 14px;}
ul,ol{padding-left:34px;margin:0 0 14px;}
li{margin:6px 0;}
code{background:var(--fus-panel2);padding:2px 6px;border-radius:6px;font-size:13px;color:var(--fus-cyan);}
blockquote{margin:16px 0;padding:12px 16px;background:var(--fus-panel);border-left:4px solid var(--fus-amber);border-radius:8px;color:var(--fus-muted);}

/* ===== Header ===== */
.fus-header{position:sticky;top:0;z-index:50;background:rgba(11,14,20,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--fus-line);}
.fus-header-inner{max-width:var(--fus-maxw);margin:0 auto;padding:0 20px;height:62px;display:flex;align-items:center;gap:18px;}
.fus-logo{font-weight:800;font-size:17px;color:#fff;letter-spacing:.3px;white-space:nowrap;}
.fus-logo:hover{text-decoration:none;}
.fus-nav{display:flex;align-items:center;gap:4px;margin-left:auto;flex-wrap:wrap;}
.fus-nav>a,.fus-nav-item>a{color:var(--fus-muted);padding:8px 12px;border-radius:8px;font-size:14px;display:inline-block;}
.fus-nav>a:hover,.fus-nav-item>a:hover{color:#fff;background:var(--fus-panel);text-decoration:none;}
.fus-nav>a.active,.fus-nav-item>a.active{color:#fff;background:linear-gradient(135deg,var(--fus-violet),var(--fus-cyan));}
.fus-nav-item{position:relative;}
.fus-nav-sub{position:absolute;top:100%;left:0;background:var(--fus-panel);border:1px solid var(--fus-line);border-radius:10px;padding:6px;min-width:150px;display:none;flex-direction:column;box-shadow:0 12px 32px rgba(0,0,0,.5);}
.fus-nav-item:hover .fus-nav-sub,.fus-nav-item:focus-within .fus-nav-sub{display:flex;}
.fus-nav-sub a{padding:7px 12px;border-radius:7px;color:var(--fus-muted);font-size:13px;white-space:nowrap;}
.fus-nav-sub a:hover{color:#fff;background:var(--fus-panel2);}
.fus-nav-toggle{display:none;background:none;border:1px solid var(--fus-line);color:#fff;font-size:20px;border-radius:8px;width:42px;height:38px;cursor:pointer;margin-left:auto;}

/* ===== Layout wrappers ===== */
.fus-home-wrap,.fus-article-layout,.fus-list-layout,.fus-page-wrap{max-width:var(--fus-maxw);margin:0 auto;padding:18px 20px 40px;}
.fus-article-layout,.fus-list-layout,.fus-page-wrap{--h2-inset:16px;}
.fus-page-wrap{--h2-inset:48px;}

/* Breadcrumb */
.fus-crumb{padding:10px 0 6px;padding-left:var(--h2-inset);font-size:13px;color:var(--fus-muted);margin-bottom:8px;}
.fus-crumb a{color:var(--fus-muted);}
.fus-crumb a:hover{color:var(--fus-cyan);}
.fus-crumb span{color:var(--fus-text);}
.fus-crumb .sep{margin:0 8px;color:var(--fus-line);}

/* ===== Grids ===== */
.fus-layout-grid{display:grid;gap:30px;}
.fus-article-layout .fus-layout-grid{grid-template-columns:minmax(0,1fr) 240px;}
.fus-list-layout .fus-layout-grid{grid-template-columns:240px minmax(0,1fr);}

/* Detail content */
.fus-content-main{background:var(--fus-bg2);border:1px solid var(--fus-line);border-radius:var(--fus-radius);padding:28px 30px;min-width:0;}
.fus-page-main{background:var(--fus-bg2);border:1px solid var(--fus-line);border-radius:var(--fus-radius);padding:28px 30px;min-width:0;}
.fus-cat-content{background:var(--fus-bg2);border:1px solid var(--fus-line);border-radius:var(--fus-radius);padding:24px 28px;min-width:0;}

/* TOC aside */
.fus-toc-aside{position:sticky;top:80px;align-self:start;max-height:calc(100vh - 100px);overflow:auto;}
.fus-toc-aside .toc-panel{background:var(--fus-panel);border:1px solid var(--fus-line);border-radius:12px;padding:6px 4px;}
.fus-toc-aside summary{font-weight:700;color:#fff;padding:10px 14px;cursor:pointer;list-style:none;}
.fus-toc-aside summary::-webkit-details-marker{display:none;}
.fus-toc-aside summary::after{content:"▾";float:right;color:var(--fus-cyan);}
.fus-toc-aside ol{margin:0;padding:4px 0 8px 0;list-style:none;counter-reset:toc;}
.fus-toc-aside li{counter-increment:toc;margin:0;}
.fus-toc-aside li a{display:block;padding:6px 14px;color:var(--fus-muted);font-size:13px;border-radius:7px;}
.fus-toc-aside li a::before{content:counter(toc) ". ";color:var(--fus-violet);}
.fus-toc-aside li a:hover{background:var(--fus-panel2);color:#fff;text-decoration:none;}

/* Category side */
.fus-cat-side .cat-panel{background:var(--fus-panel);border:1px solid var(--fus-line);border-radius:12px;padding:6px 4px;position:sticky;top:80px;}
.fus-cat-side summary{font-weight:700;color:#fff;padding:10px 14px;cursor:pointer;list-style:none;}
.fus-cat-side summary::-webkit-details-marker{display:none;}
.fus-cat-side summary::after{content:"▾";float:right;color:var(--fus-cyan);}
.fus-cat-side ul.category-list{list-style:none;margin:0;padding:4px 0 8px;}
.fus-cat-side li a{display:block;padding:8px 14px;border-radius:7px;color:var(--fus-muted);font-size:14px;}
.fus-cat-side li a:hover,.fus-cat-side li a.active{background:var(--fus-panel2);color:#fff;text-decoration:none;}

/* ===== Tables ===== */
.fus-content-main table,.fus-page-main table,.fus-cat-content table,table.fus-spec{
  border-collapse:collapse;width:100%;margin:16px 0;font-size:14px;
  border:1px solid #cbd5e1;background:var(--fus-panel);
}
.fus-content-main th,.fus-page-main th,.fus-cat-content th,table.fus-spec th{
  background:linear-gradient(135deg,#1B2A4A,#22305A);color:#fff;text-align:left;padding:10px 12px;border:1px solid #cbd5e1;
}
.fus-content-main td,.fus-page-main td,.fus-cat-content td,table.fus-spec td{
  padding:9px 12px;border:1px solid #cbd5e1;color:var(--fus-text);
}
.fus-content-main tbody tr:nth-child(even),.fus-page-main tbody tr:nth-child(even),.fus-cat-content tbody tr:nth-child(even){background:rgba(255,255,255,.03);}

/* ===== FAQ details ===== */
.fus-content-main details,.fus-page-main details{background:var(--fus-panel);border:1px solid var(--fus-line);border-radius:10px;margin:12px 0;padding:0 16px;}
.fus-content-main details summary,.fus-page-main details summary{cursor:pointer;font-weight:600;color:#fff;padding:14px 0;list-style:none;}
.fus-content-main details summary::-webkit-details-marker{display:none;}
.fus-content-main details summary::after{content:"+";float:right;color:var(--fus-cyan);font-size:18px;}
.fus-content-main details[open] summary::after{content:"−";}
.fus-content-main details div{padding:0 0 14px;color:var(--fus-muted);}

/* Callouts */
.fus-callout{background:var(--fus-panel);border:1px solid var(--fus-violet);border-left:4px solid var(--fus-violet);border-radius:10px;padding:14px 18px;margin:16px 0;}
.fus-callout .tag{color:var(--fus-violet);font-weight:700;font-size:13px;}

/* Tag text */
.tag-text{display:inline-block;background:var(--fus-panel2);border:1px solid var(--fus-line);color:var(--fus-cyan);border-radius:999px;padding:2px 10px;font-size:12px;margin:2px 4px 2px 0;}

/* Card grids (home / list cards) */
.fus-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;margin:18px 0;}
.fus-card{background:var(--fus-panel);border:1px solid var(--fus-line);border-radius:12px;padding:18px;transition:.2s;}
.fus-card:hover{border-color:var(--fus-cyan);transform:translateY(-3px);}
.fus-card h3{margin:0 0 8px;font-size:17px;}
.fus-card h3 a{color:#fff;}
.fus-card p{color:var(--fus-muted);font-size:13px;margin:0;}
.fus-card .fus-meta{margin-top:10px;font-size:12px;color:var(--fus-muted);}
.fus-card .fus-cat-badge{display:inline-block;background:rgba(139,92,246,.18);color:var(--fus-violet);border-radius:6px;padding:2px 8px;font-size:11px;}

/* Home hero */
.fus-hero{background:radial-gradient(1200px 400px at 20% -10%,rgba(139,92,246,.25),transparent),var(--fus-bg2);border:1px solid var(--fus-line);border-radius:18px;padding:46px 40px;margin-bottom:26px;}
.fus-hero h1{font-size:38px;background:linear-gradient(135deg,#fff,#b9a7ff);-webkit-background-clip:text;background-clip:text;color:transparent;margin-bottom:14px;}
.fus-hero p{color:var(--fus-muted);max-width:760px;font-size:16px;}
.fus-hero .fus-cta{display:inline-flex;gap:12px;margin-top:18px;}
.fus-btn{display:inline-block;padding:11px 22px;border-radius:10px;font-weight:700;font-size:14px;}
.fus-btn.primary{background:linear-gradient(135deg,var(--fus-violet),var(--fus-cyan));color:#06121f;}
.fus-btn.ghost{border:1px solid var(--fus-line);color:#fff;}
.fus-btn:hover{text-decoration:none;opacity:.92;}

.fus-section-title{font-size:22px;margin:30px 0 6px;padding-left:var(--h2-inset);}
.fus-section-sub{color:var(--fus-muted);margin:0 0 8px;padding-left:var(--h2-inset);}

.fus-stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin:18px 0;}
.fus-stat{background:var(--fus-panel);border:1px solid var(--fus-line);border-radius:12px;padding:18px;text-align:center;}
.fus-stat b{display:block;font-size:26px;color:var(--fus-cyan);}
.fus-stat span{color:var(--fus-muted);font-size:13px;}

.fus-caps{display:flex;flex-wrap:wrap;gap:10px;margin:12px 0;}
.fus-caps .cap{background:var(--fus-panel);border:1px solid var(--fus-line);border-radius:999px;padding:7px 14px;font-size:13px;color:var(--fus-text);}
.fus-caps .cap b{color:var(--fus-violet);}

/* ===== Float capsule ===== */
.fus-float{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:10px;}
.fus-float-btn{width:54px;height:54px;border-radius:28px;border:none;cursor:pointer;background:linear-gradient(135deg,var(--fus-violet),var(--fus-cyan));color:#06121f;font-size:20px;font-weight:700;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 8px 24px rgba(34,211,238,.35);line-height:1;}
.fus-float-btn span{font-size:10px;margin-top:2px;font-weight:600;}
.fus-float-btn:hover{transform:scale(1.06);}

.fus-card-modal{position:fixed;inset:0;z-index:80;display:flex;align-items:center;justify-content:center;}
.fus-card-modal[hidden]{display:none;}
.fus-card-mask{position:absolute;inset:0;background:rgba(0,0,0,.7);}
.fus-card-box{position:relative;background:#fff;border-radius:12px;padding:10px;max-height:92vh;overflow:auto;}
.fus-card-img{display:block;width:auto;height:auto;max-width:min(320px,80vw);max-height:80vh;}
.fus-card-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;border:none;background:#fff;color:#111;font-size:20px;cursor:pointer;box-shadow:0 4px 14px rgba(0,0,0,.4);}

/* ===== Footer ===== */
.fus-footer{background:var(--fus-bg2);border-top:1px solid var(--fus-line);margin-top:40px;}
.fus-footer-inner{max-width:var(--fus-maxw);margin:0 auto;padding:34px 20px;display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px;}
.fus-foot-title{color:#fff;font-weight:700;margin-bottom:12px;font-size:14px;}
.fus-foot-col p{color:var(--fus-muted);font-size:13px;}
.fus-foot-col a{display:block;color:var(--fus-muted);font-size:13px;padding:4px 0;}
.fus-foot-col a:hover{color:var(--fus-cyan);}
.fus-foot-bottom{max-width:var(--fus-maxw);margin:0 auto;padding:14px 20px;border-top:1px solid var(--fus-line);color:var(--fus-muted);font-size:12px;}

/* ===== Responsive ===== */
@media (max-width:1024px){
  .fus-nav{display:none;position:absolute;top:62px;left:0;right:0;background:var(--fus-bg2);border-bottom:1px solid var(--fus-line);flex-direction:column;padding:10px;gap:2px;}
  .fus-nav.open{display:flex;}
  .fus-nav-toggle{display:block;}
  .fus-nav-item{width:100%;}
  .fus-nav-sub{position:static;display:flex;flex-direction:column;box-shadow:none;border:none;background:var(--fus-panel);margin:2px 0 4px;padding:4px;}
  .fus-article-layout .fus-layout-grid,.fus-list-layout .fus-layout-grid{grid-template-columns:1fr;}
  .fus-toc-aside,.fus-cat-side .cat-panel{position:static;max-height:none;}
  .fus-toc-aside{margin-top:14px;}
  .fus-float{right:10px;}
  .fus-footer-inner{grid-template-columns:1fr 1fr;}
}
@media (max-width:600px){
  .fus-hero{padding:30px 22px;}
  .fus-hero h1{font-size:28px;}
  .fus-content-main,.fus-page-main,.fus-cat-content{padding:20px 16px;}
  .fus-footer-inner{grid-template-columns:1fr;}
}