:root{
  --bg:#0B1220;
  --bg-2:#0E1626;
  --surface:#121C2E;
  --surface-2:#172238;
  --border:#22304A;
  --border-soft:#1B283E;
  --text:#E6EDF6;
  --muted:#9FB0C3;
  --accent:#25E0D6;
  --accent-2:#5AA9FF;
  --gold:#C9A227;
  --radius:12px;
  --maxw:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent-2);text-decoration:none}
a:hover{color:var(--accent);text-decoration:underline}
img{max-width:100%;height:auto}
h1,h2,h3,h4{line-height:1.3;color:#fff;font-weight:700}
h1{font-size:30px;margin:0 0 16px}
h2{font-size:24px;margin:32px 0 14px;padding-bottom:8px;border-bottom:1px solid var(--border)}
h3{font-size:19px;margin:24px 0 10px;color:#DCE7F2}
p{margin:0 0 14px}
ul,ol{padding-left:22px;margin:0 0 14px}
li{margin:4px 0}
blockquote{
  margin:16px 0;padding:12px 16px;background:var(--surface);
  border-left:3px solid var(--accent);border-radius:8px;color:var(--muted);
}
code{background:var(--surface-2);padding:2px 6px;border-radius:5px;font-size:90%}
hr{border:none;border-top:1px solid var(--border);margin:24px 0}
time{color:var(--muted);font-size:14px}

/* ===== Header / Nav ===== */
.bld-header{position:sticky;top:0;z-index:50;background:rgba(11,18,32,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.bld-header-inner{max-width:var(--maxw);margin:0 auto;display:flex;align-items:center;gap:18px;padding:0 20px;height:60px}
.bld-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700}
.bld-brand:hover{text-decoration:none}
.bld-brand-mark{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#04121a;font-weight:800;padding:4px 9px;border-radius:8px;font-size:14px}
.bld-brand-text{font-size:16px}
.bld-nav{display:flex;align-items:center;gap:6px;margin-left:auto;flex-wrap:wrap}
.bld-nav-item{position:relative}
.bld-nav-item>a,.bld-nav-leaf{padding:10px 12px;color:var(--text);border-radius:8px;display:inline-block}
.bld-nav-item>a:hover,.bld-nav-leaf:hover{background:var(--surface);text-decoration:none;color:#fff}
.bld-nav-sub{display:none;position:absolute;top:100%;left:0;min-width:170px;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:6px;box-shadow:0 12px 30px rgba(0,0,0,.4);z-index:60}
.bld-nav-sub a{display:block;padding:8px 10px;border-radius:7px;color:var(--muted)}
.bld-nav-sub a:hover{background:var(--surface-2);color:#fff;text-decoration:none}
.bld-nav-item:hover .bld-nav-sub{display:block}
.bld-nav-toggle{display:none;background:none;border:1px solid var(--border);color:#fff;font-size:20px;border-radius:8px;width:42px;height:38px;cursor:pointer;margin-left:auto}

/* ===== Layout ===== */
.bld-main{max-width:var(--maxw);margin:0 auto;padding:24px 20px 60px}
.bld-layout-grid{display:grid;grid-template-columns:240px minmax(0,1fr) 240px;gap:24px;align-items:start}
.bld-layout-grid--wide{grid-template-columns:minmax(0,1fr) 240px}
.bld-layout-grid--single{grid-template-columns:minmax(0,1fr)}
body.bld-detail .bld-main{max-width:1360px}
.bld-content-wrap{min-width:0}
.bld-content-main{background:var(--surface);border:1px solid var(--border-soft);border-radius:var(--radius);padding:28px 30px;min-width:0}

/* ===== Cat / TOC panels ===== */
.bld-cat-panel,.bld-toc-panel{position:sticky;top:84px}
.bld-panel{background:var(--surface);border:1px solid var(--border-soft);border-radius:var(--radius);padding:14px 16px}
.bld-panel>summary{cursor:pointer;font-weight:700;color:#fff;list-style:none;outline:none}
.bld-panel>summary::-webkit-details-marker{display:none}
.bld-panel>summary::before{content:"▸ ";color:var(--accent)}
.bld-panel[open]>summary::before{content:"▾ "}
.bld-cat-list,.bld-toc-list{list-style:none;margin:10px 0 0;padding:0}
.bld-cat-list a,.bld-toc-list a{display:block;padding:6px 8px;border-radius:7px;color:var(--muted);font-size:14.5px}
.bld-cat-list a:hover,.bld-toc-list a:hover{background:var(--surface-2);color:#fff;text-decoration:none}
.bld-cat-list a.active{background:var(--surface-2);color:var(--accent);font-weight:600}
.bld-toc-lvl-3 a{padding-left:20px;font-size:13.5px}

/* ===== Breadcrumb ===== */
.bld-crumb{font-size:14px;color:var(--muted);margin-bottom:14px;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.bld-crumb a{color:var(--muted)}
.bld-crumb a:hover{color:var(--accent)}
.bld-crumb-sep{opacity:.5}
.bld-crumb span:last-child{color:var(--text)}

/* ===== Tables (bld-spec) ===== */
.bld-content-main table,.bld-spec{width:100%;border-collapse:collapse;margin:18px 0;font-size:15px;overflow:hidden;border-radius:10px}
.bld-content-main table th,.bld-content-main table td,.bld-spec th,.bld-spec td{border:1px solid var(--border);padding:10px 12px;text-align:left;vertical-align:top}
.bld-content-main table th,.bld-spec th{background:var(--surface-2);color:#fff;font-weight:600}
.bld-content-main table tr:nth-child(even) td,.bld-spec tr:nth-child(even) td{background:rgba(255,255,255,.02)}
.bld-content-main table td:first-child{color:var(--accent);font-weight:600;white-space:nowrap}

/* ===== FAQ (bare details) ===== */
.bld-faq details,.bld-content-main details{background:var(--surface-2);border:1px solid var(--border);border-radius:10px;margin:12px 0;padding:0 16px}
.bld-faq details summary,.bld-content-main details>summary{cursor:pointer;font-weight:600;color:#fff;padding:12px 0;list-style:none;outline:none}
.bld-faq details summary::-webkit-details-marker,.bld-content-main details>summary::-webkit-details-marker{display:none}
.bld-faq details summary::before,.bld-content-main details>summary::before{content:"＋ ";color:var(--accent);font-weight:800}
.bld-faq details[open] summary::before,.bld-content-main details[open]>summary::before{content:"－ "}
.bld-faq details[open] summary,.bld-content-main details[open]>summary{border-bottom:1px solid var(--border);margin-bottom:6px}

/* ===== Related lists ===== */
.bld-related{background:var(--bg-2);border:1px solid var(--border-soft);border-radius:10px;padding:14px 18px;margin-top:18px}
.bld-related h2{margin-top:0;border:none;font-size:18px}
.bld-related a{color:var(--accent-2)}

/* ===== Home ===== */
.bld-hero{background:radial-gradient(1200px 400px at 70% -10%,rgba(37,224,214,.16),transparent),var(--surface);border:1px solid var(--border-soft);border-radius:var(--radius);padding:48px 36px;margin-bottom:30px}
.bld-hero-title{font-size:38px;margin:0 0 12px;background:linear-gradient(120deg,#fff,var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.bld-hero-sub{color:var(--muted);max-width:760px;font-size:17px;margin:0 0 22px}
.bld-hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:26px}
.bld-hero-stats{display:flex;gap:30px;flex-wrap:wrap;list-style:none;margin:0;padding:0}
.bld-hero-stats li{display:flex;flex-direction:column}
.bld-stat-num{font-size:30px;font-weight:800;color:var(--accent)}
.bld-stat-label{color:var(--muted);font-size:14px}
.bld-section{margin:36px 0}
.bld-section-title{font-size:22px;margin:0 0 18px}
.bld-card-grid{display:grid;gap:18px}
.bld-card-grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.bld-card-grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.bld-card{display:block;background:var(--surface);border:1px solid var(--border-soft);border-radius:var(--radius);padding:20px 22px;transition:.18s;min-width:0}
.bld-card:hover{transform:translateY(-3px);border-color:var(--accent);text-decoration:none}
.bld-card-title{margin:0 0 8px;font-size:18px;color:#fff}
.bld-card-desc{margin:0;color:var(--muted);font-size:14.5px}
.bld-capsules{display:flex;flex-wrap:wrap;gap:10px}
.bld-capsule{background:var(--surface-2);border:1px solid var(--border);border-radius:999px;padding:8px 16px;color:var(--text);font-size:14.5px}
.bld-cta-section{margin-top:40px}
.bld-cta-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:32px;text-align:center}
.bld-cta-box h2{margin-top:0;border:none}
.bld-cta-box p{color:var(--muted);max-width:640px;margin:0 auto 18px}

/* ===== Buttons ===== */
.bld-btn{display:inline-block;padding:10px 20px;border-radius:9px;border:1px solid var(--border);color:var(--text);background:var(--surface-2);font-weight:600}
.bld-btn:hover{text-decoration:none;border-color:var(--accent);color:#fff}
.bld-btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#04121a;border:none}
.bld-btn-primary:hover{filter:brightness(1.08);color:#04121a}

.bld-detail-title,.bld-page-title{font-size:28px;margin:0 0 16px;padding-bottom:10px;border-bottom:1px solid var(--border)}

/* ===== List pages ===== */
.bld-list-title{margin-top:0}
.bld-list-intro{color:var(--muted);margin:0 0 20px}
.bld-list-card .bld-card-desc{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}

/* ===== Page (about/contact...) ===== */
.bld-page-grid{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:24px;align-items:start}
.bld-page-main{max-width:none}
.bld-page-toc{position:sticky;top:84px}

/* ===== Footer ===== */
.bld-footer{background:var(--bg-2);border-top:1px solid var(--border);margin-top:40px}
.bld-footer-inner{max-width:var(--maxw);margin:0 auto;padding:36px 20px 24px}
.bld-footer-cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}
.bld-footer-col h3{margin:0 0 10px;font-size:17px}
.bld-footer-col h4{margin:0 0 10px;font-size:14px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.bld-footer-col p{color:var(--muted);font-size:14px}
.bld-footer-col ul{list-style:none;margin:0;padding:0}
.bld-footer-col li{margin:6px 0}
.bld-footer-col a{color:var(--muted);font-size:14px}
.bld-footer-col a:hover{color:var(--accent)}
.bld-footer-bottom{margin-top:26px;padding-top:16px;border-top:1px solid var(--border-soft);color:var(--muted);font-size:13.5px;display:flex;gap:10px;align-items:center}
.bld-footer-sep{opacity:.5}

/* ===== Floating capsule ===== */
.bld-float{position:fixed;right:0;top:50%;transform:translateY(-50%);display:flex;flex-direction:column;gap:8px;z-index:70;align-items:flex-end}
.bld-float-btn{display:flex;align-items:center;gap:8px;height:42px;padding:0 16px 0 12px;border-radius:21px 0 0 21px;border:1px solid var(--border);border-right:none;background:var(--surface);color:var(--text);font-size:14px;cursor:pointer;box-shadow:0 8px 20px rgba(0,0,0,.4);transition:.18s}
.bld-float-btn:hover{border-color:var(--accent);color:var(--accent);padding-right:20px}
.bld-float-ico{font-size:17px;line-height:1;display:flex;align-items:center}
.bld-float-ico img{width:20px;height:20px;border-radius:4px;display:block}
.bld-float-txt{white-space:nowrap}
.bld-float-mail{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#04121a;border:none;font-weight:700}
.bld-float-mail:hover{color:#04121a}

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

/* ===== Archive ===== */
.bld-archive-list{columns:2;column-gap:30px}
.bld-archive-list li{break-inside:avoid}
.bld-404{text-align:center}

/* ===== Responsive ===== */
@media (max-width:1024px){
  .bld-layout-grid{grid-template-columns:1fr}
  .bld-page-grid{grid-template-columns:1fr}
  .bld-cat-panel,.bld-toc-panel{position:static;top:auto}
  .bld-card-grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .bld-footer-cols{grid-template-columns:1fr 1fr}
  .bld-nav{display:none;position:absolute;top:60px;left:0;right:0;flex-direction:column;align-items:stretch;background:var(--surface);border-bottom:1px solid var(--border);padding:8px 12px;gap:2px}
  .bld-nav.open{display:flex}
  .bld-nav-item{position:static}
  .bld-nav-sub{position:static;display:block;box-shadow:none;border:none;background:transparent;padding:0 0 6px 12px;min-width:0}
  .bld-nav-toggle{display:block}
}
@media (max-width:680px){
  .bld-card-grid-2,.bld-card-grid-3{grid-template-columns:1fr}
  .bld-archive-list{columns:1}
  .bld-footer-cols{grid-template-columns:1fr}
  .bld-content-main{padding:20px 18px}
  .bld-float-btn{height:38px;padding:0 12px 0 10px;font-size:13px;gap:6px}
  .bld-float-btn:hover{padding-right:12px}
  .bld-hero{padding:34px 22px}
  .bld-hero-title{font-size:30px}
}