:root{
  --att-bg:#0F0F17;
  --att-surface:#181826;
  --att-surface-2:#20203a;
  --att-primary:#8B5CF6;
  --att-primary-soft:#3b2f6b;
  --att-accent:#F97316;
  --att-text:#E6EDF3;
  --att-text-dim:#9AA4B2;
  --att-line:#2a2a40;
  --att-border:#cbd5e1;
  --att-maxw:1180px;
  --att-nav-h:64px;
  --h2-inset:0px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body.att-body{
  margin:0;
  background:var(--att-bg);
  color:var(--att-text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.75;
  font-size:16px;
}
a{color:var(--att-primary);text-decoration:none;}
a:hover{text-decoration:underline;}
img{max-width:100%;height:auto;}

/* ===== Header ===== */
.att-header{
  position:fixed;top:0;left:0;right:0;height:var(--att-nav-h);
  background:rgba(15,15,23,.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--att-line);
  z-index:1000;
}
.att-header-inner{
  max-width:var(--att-maxw);margin:0 auto;height:100%;
  display:flex;align-items:center;gap:24px;padding:0 20px;
}
.att-logo{font-size:18px;font-weight:700;color:var(--att-text);white-space:nowrap;}
.att-logo:hover{text-decoration:none;}
.att-nav{display:flex;gap:22px;margin-left:auto;}
.att-nav a{color:var(--att-text-dim);font-size:15px;}
.att-nav a:hover{color:var(--att-primary);text-decoration:none;}
.att-nav-toggle{
  display:none;background:none;border:1px solid var(--att-line);color:var(--att-text);
  font-size:22px;width:42px;height:38px;border-radius:8px;cursor:pointer;margin-left:auto;
}

/* ===== Container ===== */
.att-container{max-width:var(--att-maxw);margin:0 auto;padding:calc(var(--att-nav-h) + 24px) 20px 48px;}

/* ===== Breadcrumb ===== */
.att-breadcrumb{margin:0 0 18px;font-size:13.5px;color:var(--att-text-dim);}
.att-breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;}
.att-breadcrumb li{display:flex;align-items:center;}
.att-breadcrumb li:not(:last-child)::after{content:"›";margin-left:6px;color:var(--att-line);}
.att-breadcrumb a{color:var(--att-text-dim);}
.att-breadcrumb .current span{color:var(--att-text);}
.att-breadcrumb-page{padding-left:0;}

/* ===== Detail layout ===== */
.att-detail-layout .att-layout-grid{
  display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:36px;align-items:start;
}
.att-content-main{min-width:0;}
.att-content-main h1{font-size:30px;line-height:1.3;margin:0 0 18px;color:#fff;}
.att-content-main h2{
  font-size:22px;margin:34px 0 14px;padding-left:12px;
  border-left:4px solid var(--att-primary);color:#fff;
}
.att-content-main h3{font-size:18px;margin:24px 0 10px;color:var(--att-primary);}
.att-content-main p{margin:12px 0;}
.att-content-main ul,.att-content-main ol{padding-left:22px;margin:12px 0;}
.att-content-main li{margin:6px 0;}

/* summary + keywords + time */
.att-summary-block{
  background:var(--att-surface);border:1px solid var(--att-line);border-left:4px solid var(--att-accent);
  padding:16px 18px;border-radius:10px;color:var(--att-text);margin:0 0 18px;
}
.att-keywords{font-size:13.5px;color:var(--att-text-dim);margin:0 0 14px;}
.att-keywords b{color:var(--att-accent);}
.att-update-time{font-size:13px;color:var(--att-text-dim);margin:6px 0 0;}

/* tables */
.att-content-main table,table.att-spec{
  width:100%;border-collapse:collapse;margin:16px 0;font-size:14.5px;
  border:1px solid var(--att-border);
}
.att-content-main table th,table.att-spec th{
  background:var(--att-primary);color:#fff;text-align:left;padding:10px 12px;border:1px solid var(--att-border);
}
.att-content-main table td,table.att-spec td{
  padding:9px 12px;border:1px solid var(--att-border);color:var(--att-text);
}
.att-content-main table tr:nth-child(even) td,table.att-spec tr:nth-child(even) td{
  background:var(--att-surface);
}

/* callout / conclusion */
.att-conclusion{
  background:var(--att-surface-2);border:1px solid var(--att-primary-soft);
  border-radius:10px;padding:14px 18px;margin:20px 0;
}
.att-conclusion p{margin:6px 0;}
.att-case-callout{
  background:linear-gradient(135deg,rgba(139,92,246,.12),rgba(249,115,22,.10));
  border:1px solid var(--att-line);border-radius:10px;padding:14px 18px;margin:20px 0;
}
.att-case-callout .att-case-tag{color:var(--att-accent);font-weight:700;font-size:13px;}

/* FAQ bare details */
.att-content-main details.att-faq-item{
  border:1px solid var(--att-line);border-radius:10px;margin:10px 0;background:var(--att-surface);overflow:hidden;
}
.att-content-main details.att-faq-item summary{
  cursor:pointer;padding:12px 16px;font-weight:600;color:#fff;list-style:none;
}
.att-content-main details.att-faq-item summary::-webkit-details-marker{display:none;}
.att-content-main details.att-faq-item summary::before{content:"+";color:var(--att-primary);margin-right:10px;font-weight:700;}
.att-content-main details.att-faq-item[open] summary::before{content:"−";}
.att-content-main details.att-faq-item .att-faq-a{padding:0 16px 14px;color:var(--att-text-dim);}

/* related */
.att-related{margin:26px 0 0;border-top:1px solid var(--att-line);padding-top:16px;}
.att-related h2{border-left:none;padding-left:0;font-size:19px;}
.att-related ul{list-style:none;padding-left:0;}
.att-related li{margin:8px 0;padding-left:14px;position:relative;}
.att-related li::before{content:"→";position:absolute;left:0;color:var(--att-accent);}
.att-related .att-why{color:var(--att-text-dim);font-size:13.5px;}

/* TOC aside */
.att-toc-aside{position:sticky;top:calc(var(--att-nav-h) + 20px);max-height:calc(100vh - 100px);overflow-y:auto;}
.att-toc-panel,.att-cat-panel{
  background:var(--att-surface);border:1px solid var(--att-line);border-radius:12px;padding:12px 14px;
}
.att-toc-panel summary,.att-cat-panel summary{
  cursor:pointer;font-weight:700;color:#fff;list-style:none;padding:4px 0;
}
.att-toc-panel summary::-webkit-details-marker,.att-cat-panel summary::-webkit-details-marker{display:none;}
.att-toc-panel summary::after,.att-cat-panel summary::after{content:"▾";float:right;color:var(--att-primary);transition:transform .2s;}
.att-toc-panel:not([open]) summary::after,.att-cat-panel:not([open]) summary::after{transform:rotate(-90deg);}
.att-toc-panel ul,.att-cat-panel ul{list-style:none;margin:10px 0 0;padding:0;}
.att-toc-panel li,.att-cat-panel li{margin:7px 0;font-size:13.5px;}
.att-toc-panel a,.att-cat-panel a{color:var(--att-text-dim);}
.att-toc-panel a:hover,.att-cat-panel a:hover{color:var(--att-primary);}
.att-category-list .active a{color:var(--att-accent);font-weight:700;}

/* ===== List layout ===== */
.att-list-layout .att-layout-grid{
  display:grid;grid-template-columns:240px minmax(0,1fr);gap:36px;align-items:start;
}
.att-cat-side{position:sticky;top:calc(var(--att-nav-h) + 20px);}
.att-cat-content{min-width:0;}
.att-list-intro{margin:0 0 18px;color:var(--att-text-dim);}
.att-list-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;margin-top:18px;}
.att-card{
  background:var(--att-surface);border:1px solid var(--att-line);border-radius:12px;padding:18px;
  transition:transform .15s,border-color .15s;display:flex;flex-direction:column;gap:8px;
}
.att-card:hover{transform:translateY(-3px);border-color:var(--att-primary);text-decoration:none;}
.att-card h3{margin:0;font-size:17px;color:#fff;}
.att-card p{margin:0;font-size:13.5px;color:var(--att-text-dim);}
.att-card .att-card-meta{font-size:12.5px;color:var(--att-accent);}

/* ===== Page layout ===== */
.att-page-wrap{max-width:880px;margin:0 auto;}
.att-page-main{min-width:0;}
.att-page-main h1{font-size:30px;color:#fff;margin:0 0 18px;}
.att-page-main h2{font-size:22px;margin:30px 0 12px;padding-left:12px;border-left:4px solid var(--att-primary);color:#fff;}
.att-page-main h3{font-size:18px;color:var(--att-primary);margin:22px 0 8px;}
.att-page-main table,table.att-spec{width:100%;border-collapse:collapse;margin:16px 0;font-size:14.5px;border:1px solid var(--att-border);}

/* ===== Float capsule ===== */
.att-float{
  position:fixed;right:18px;top:50%;transform:translateY(-50%);
  display:flex;flex-direction:column;gap:10px;z-index:1100;
}
.att-float-btn{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  width:54px;height:54px;border-radius:27px;border:none;cursor:pointer;
  background:linear-gradient(135deg,var(--att-primary),var(--att-accent));
  color:#fff;font-size:11px;box-shadow:0 6px 18px rgba(139,92,246,.4);
  text-decoration:none;transition:transform .15s;
}
.att-float-btn:hover{transform:scale(1.06);text-decoration:none;color:#fff;}
.att-float-ico{font-size:18px;line-height:1;}
.att-float-txt{margin-top:2px;}

/* card pop */
.att-card-pop{position:fixed;inset:0;background:rgba(0,0,0,.72);display:flex;align-items:center;justify-content:center;z-index:1200;}
.att-card-pop[hidden]{display:none;}
.att-card-pop-inner{position:relative;background:#fff;border-radius:12px;padding:8px;}
.att-card-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;border:none;background:var(--att-accent);color:#fff;font-size:20px;cursor:pointer;}
.att-card-img{display:block;border-radius:6px;}

/* ===== Footer ===== */
.att-footer{background:var(--att-surface);border-top:1px solid var(--att-line);margin-top:40px;}
.att-footer-inner{max-width:var(--att-maxw);margin:0 auto;padding:36px 20px;display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.att-footer-col h3{font-size:15px;color:#fff;margin:0 0 12px;}
.att-footer-col ul{list-style:none;padding:0;margin:0;}
.att-footer-col li{margin:7px 0;}
.att-footer-col a{color:var(--att-text-dim);font-size:14px;}
.att-footer-bottom{border-top:1px solid var(--att-line);padding:16px 20px;text-align:center;color:var(--att-text-dim);font-size:13px;}

/* ===== Home ===== */
.att-hero{
  background:linear-gradient(135deg,var(--att-surface-2),var(--att-surface));
  border:1px solid var(--att-line);border-radius:16px;padding:40px 34px;margin-bottom:30px;
}
.att-hero h1{font-size:34px;color:#fff;margin:0 0 14px;}
.att-hero p{color:var(--att-text-dim);font-size:16px;max-width:760px;}
.att-section{margin:34px 0;}
.att-section h2{font-size:24px;color:#fff;margin:0 0 6px;padding-left:12px;border-left:4px solid var(--att-accent);}
.att-section .att-sub{color:var(--att-text-dim);margin:0 0 18px;}
.att-pill-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px;}
.att-pill{background:var(--att-surface);border:1px solid var(--att-line);border-radius:999px;padding:8px 16px;font-size:14px;color:var(--att-text);}
.att-pill b{color:var(--att-accent);}
.att-kv{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:16px;}
.att-kv .att-kv-card{background:var(--att-surface);border:1px solid var(--att-line);border-radius:12px;padding:18px;}
.att-kv .att-kv-card h4{margin:0 0 8px;color:var(--att-primary);font-size:15px;}
.att-kv .att-kv-card p{margin:0;font-size:13.5px;color:var(--att-text-dim);}
.att-home-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px;margin-top:16px;}
.att-home-cards a.att-card{color:var(--att-text);}

/* pagination */
.att-pagination{display:flex;gap:8px;margin-top:24px;flex-wrap:wrap;}
.att-pagination a,.att-pagination span{padding:8px 14px;border:1px solid var(--att-line);border-radius:8px;color:var(--att-text-dim);font-size:14px;}
.att-pagination .current{background:var(--att-primary);color:#fff;border-color:var(--att-primary);}

/* ===== Responsive ===== */
@media (max-width:1024px){
  .att-nav{display:none;position:absolute;top:var(--att-nav-h);left:0;right:0;flex-direction:column;background:var(--att-surface);padding:14px 20px;border-bottom:1px solid var(--att-line);gap:14px;}
  .att-nav.att-open{display:flex;}
  .att-nav-toggle{display:block;}
  .att-detail-layout .att-layout-grid{grid-template-columns:1fr;}
  .att-list-layout .att-layout-grid{grid-template-columns:1fr;}
  .att-toc-aside{position:static;max-height:none;}
  .att-cat-side{position:static;}
  .att-footer-inner{grid-template-columns:1fr;}
}
@media (max-width:600px){
  .att-hero{padding:26px 20px;}
  .att-hero h1{font-size:26px;}
  .att-content-main h1{font-size:24px;}
  .att-float{right:10px;}
  .att-float-btn{width:48px;height:48px;}
}