:root{
  --bg:#0a1020; --bg2:#0e1730; --ink:#0f172a; --ink-soft:#334155;
  --paper:#ffffff; --line:#e5e9f2; --muted:#64748b;
  --brand:#0b5ed7; --brand2:#13c2c2; --accent:#38bdf8;
  --chip:#e8f0ff; --shadow:0 10px 30px rgba(11,40,90,.08);
  --radius:14px; --max:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,sans-serif;
  color:var(--ink);background:#f5f7fb;line-height:1.75;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.wrap{max-width:var(--max);margin:0 auto;padding:24px 20px 64px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(10,16,32,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,.08)}
.header-bar{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.brand-mark{width:28px;height:28px;border-radius:8px;
  background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 0 18px rgba(56,189,248,.5)}
.brand-text{display:flex;flex-direction:column;line-height:1.1;font-weight:700;font-size:17px}
.brand-text small{font-weight:400;font-size:11px;color:#9fb3d1;margin-top:2px}
.main-nav ul{display:flex;gap:6px;list-style:none;margin:0;padding:0}
.main-nav a{color:#dbe6f5;padding:8px 12px;border-radius:8px;font-size:14px;display:block}
.main-nav a:hover{background:rgba(255,255,255,.08);text-decoration:none;color:#fff}
.nav-toggle{display:none;background:none;border:1px solid rgba(255,255,255,.2);color:#fff;
  font-size:22px;line-height:1;border-radius:8px;padding:4px 10px;cursor:pointer}

/* Hero */
.hero{position:relative;overflow:hidden;color:#fff;
  background:radial-gradient(1200px 500px at 70% -10%,rgba(56,189,248,.25),transparent),
             linear-gradient(160deg,var(--bg),var(--bg2))}
.hero-inner{padding:84px 20px 72px;max-width:var(--max);margin:0 auto}
.hero h1{font-size:clamp(28px,4.4vw,52px);margin:0 0 18px;line-height:1.2;font-weight:800;
  background:linear-gradient(90deg,#fff,#bfe6ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{max-width:760px;color:#c8d8ee;font-size:clamp(15px,1.6vw,18px);margin:0 0 28px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-glow{position:absolute;inset:0;background:
  radial-gradient(600px 300px at 20% 120%,rgba(19,194,194,.18),transparent);pointer-events:none}

/* Buttons */
.btn{display:inline-block;padding:12px 22px;border-radius:10px;font-weight:600;font-size:15px}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;
  box-shadow:0 8px 22px rgba(11,94,215,.35)}
.btn-primary:hover{color:#fff;text-decoration:none;filter:brightness(1.05)}
.btn-ghost{border:1px solid rgba(255,255,255,.35);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.1);text-decoration:none;color:#fff}

/* Sections */
.section{padding:54px 0}
.sec-title{font-size:26px;margin:0 0 22px;position:relative;padding-left:14px}
.sec-title::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:5px;border-radius:3px;
  background:linear-gradient(var(--brand),var(--brand2))}
.sec-lead{color:var(--ink-soft);max-width:900px;margin:0 0 26px}

/* Pillar grid */
.pillar-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.pillar{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:22px;
  box-shadow:var(--shadow);transition:.2s;display:block;color:inherit}
.pillar:hover{transform:translateY(-4px);border-color:var(--accent);text-decoration:none}
.pillar-no{font-weight:800;color:var(--brand);font-size:14px;letter-spacing:1px}
.pillar h3{margin:8px 0 8px;font-size:18px}
.pillar p{margin:0;color:var(--muted);font-size:14px}

/* Flow */
.flow{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:8px}
.flow-node{background:#fff;border:1px solid var(--line);border-radius:999px;padding:10px 16px;font-size:14px;font-weight:600;box-shadow:var(--shadow)}
.flow-arrow{color:var(--brand);font-weight:700}

/* Tables */
table.data{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);
  border-radius:12px;overflow:hidden;box-shadow:var(--shadow);font-size:14px}
table.data th{background:linear-gradient(135deg,#0e1730,#13325f);color:#fff;text-align:left;padding:12px 14px;font-weight:600}
table.data td{padding:11px 14px;border-top:1px solid var(--line)}
table.data tbody tr:nth-child(even){background:#f7faff}
.note{color:var(--muted);font-size:13px;margin-top:10px}

/* Breadcrumb */
.breadcrumb{margin:0 0 18px;font-size:13px;color:var(--muted)}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0}
.breadcrumb li:not(:last-child)::after{content:"›";margin-left:6px;color:#c0c8d6}
.breadcrumb .active span{color:var(--ink)}

/* Detail layout */
.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:32px;align-items:start}
.detail-main{max-width:760px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 38px;box-shadow:var(--shadow)}
.detail-main h1{font-size:30px;margin:0 0 14px;line-height:1.3}
.detail-main h2{font-size:22px;margin:34px 0 12px;padding-top:6px;border-top:1px solid var(--line)}
.detail-main h3{font-size:18px;margin:22px 0 10px}
.detail-main p{margin:0 0 14px}
.detail-main ul,.detail-main ol{margin:0 0 14px;padding-left:22px}
.detail-main li{margin:6px 0}
.detail-main .update-time{margin:0 0 14px;color:var(--ink-soft);font-size:13px}
.detail-main blockquote{margin:14px 0;padding:12px 16px;border-left:4px solid var(--brand2);
  background:#f3fbff;color:var(--ink-soft);border-radius:0 8px 8px 0}
.abstract{background:#f7faff;border:1px solid var(--line);border-left:4px solid var(--brand);
  padding:16px 18px;border-radius:0 10px 10px 0;margin:0 0 22px}
.kw-line{margin:0 0 8px;font-size:13px;color:var(--muted)}
.kw-line b{color:var(--brand)}
.update-time{font-size:12px;color:var(--muted);margin:0 0 18px}

/* TOC */
.toc-aside{position:sticky;top:84px;max-height:calc(100vh - 104px);overflow-y:auto}
.toc-inner{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 14px;box-shadow:var(--shadow)}
.toc-title{font-size:13px;font-weight:700;color:var(--muted);margin:0 0 10px;text-transform:uppercase;letter-spacing:1px}
#toc{list-style:none;margin:0;padding:0;font-size:13px}
#toc li{margin:4px 0}
#toc li.lvl-3{padding-left:14px}
#toc a{color:var(--ink-soft)}
#toc a:hover{color:var(--brand)}

/* FAQ */
.faq-block{margin-top:34px;border-top:1px solid var(--line);padding-top:20px}
.faq-block h2{font-size:20px}
.faq-block details{border:1px solid var(--line);border-radius:10px;padding:0 14px;margin:10px 0;background:#fff}
.faq-block summary{cursor:pointer;font-weight:600;padding:12px 0;list-style:none}
.faq-block summary::-webkit-details-marker{display:none}
.faq-block summary::before{content:"＋";color:var(--brand);margin-right:8px;font-weight:700}
.faq-block details[open] summary::before{content:"－"}
.faq-a{padding:0 0 14px;color:var(--ink-soft)}

/* Related */
.related-block{margin-top:28px;border-top:1px solid var(--line);padding-top:18px}
.related-list{list-style:none;padding:0;margin:0}
.related-list li{margin:10px 0;padding-bottom:10px;border-bottom:1px dashed var(--line)}
.related-list a{font-weight:600}
.related-list span{display:block;color:var(--muted);font-size:13px;margin-top:2px}

/* List layout */
.list-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:28px;align-items:start}
.cat-side{position:sticky;top:84px}
.side-title{font-size:13px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:1px;margin:0 0 10px}
.category-list{list-style:none;margin:0;padding:0;background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}
.category-list li{border-bottom:1px solid var(--line)}
.category-list li:last-child{border-bottom:none}
.category-list a{display:flex;justify-content:space-between;align-items:center;padding:11px 14px;color:var(--ink);font-size:14px}
.category-list li.active a{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:600}
.category-list li.active span{color:#fff}
.category-list span{color:var(--muted);font-size:12px}
.cat-content{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;box-shadow:var(--shadow)}
.list-title{font-size:24px;margin:0 0 14px}
.cat-desc{color:var(--ink-soft);margin:0 0 18px}
.cat-content-list{list-style:none;margin:0;padding:0}
.cat-content-list .ci{padding:16px 0;border-bottom:1px solid var(--line)}
.cat-content-list .ci:last-child{border-bottom:none}
.cat-content-list h2{font-size:18px;margin:0 0 4px}
.cat-content-list h2 a{color:var(--ink)}
.ci-meta{font-size:12px;color:var(--brand);margin:0 0 4px}
.ci-desc{color:var(--muted);margin:0;font-size:14px}

/* Page */
.page-layout{max-width:900px;margin:0 auto}
.page-main{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:36px 40px;box-shadow:var(--shadow)}
.page-main h1{font-size:30px;margin:0 0 18px}
.page-main h2{font-size:22px;margin:30px 0 12px;border-top:1px solid var(--line);padding-top:16px}
.center-text{text-align:center}
.archive-list{columns:2;column-gap:30px;list-style:none;padding:0;margin:0 0 16px}
.archive-list li{break-inside:avoid;padding:4px 0}
.archive-list a{font-size:14px}

/* Contact card */
.wc-card-show{display:flex;justify-content:center;margin:26px 0}
.wc-card-show img{border-radius:12px;box-shadow:var(--shadow);width:300px;height:500px;object-fit:contain}

/* Footer */
.site-footer{background:var(--bg);color:#c8d8ee;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:48px 20px 24px}
.f-col h3{color:#fff;font-size:15px;margin:0 0 12px}
.f-col ul{list-style:none;margin:0;padding:0}
.f-col li{margin:6px 0}
.f-col a{color:#9fc4ff}
.f-col p{font-size:13px;margin:6px 0}
.muted{color:#7e93b3}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:16px 20px;font-size:12px;text-align:center}

/* Float capsule */
.float-capsule{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;
  display:flex;flex-direction:column;gap:12px}
.cap{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;
  width:56px;height:56px;border-radius:16px;border:none;cursor:pointer;color:#fff;
  font-size:11px;font-weight:600;box-shadow:0 8px 20px rgba(11,40,90,.35);transition:.2s}
.cap:hover{transform:scale(1.06)}
.cap-wechat{background:linear-gradient(135deg,#1aad19,#0b8f0b)}
.cap-top{background:linear-gradient(135deg,var(--brand),var(--brand2))}

/* WeChat modal */
.wc-modal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center}
.wc-modal[hidden]{display:none}
.wc-mask{position:absolute;inset:0;background:rgba(5,10,25,.6)}
.wc-panel{position:relative;background:#fff;border-radius:16px;padding:18px;box-shadow:0 20px 60px rgba(0,0,0,.4)}
.wc-panel img{display:block;width:300px;height:500px;object-fit:contain;border-radius:10px}
.wc-close{position:absolute;top:-12px;right:-12px;width:34px;height:34px;border-radius:50%;
  border:none;background:#334155;color:#fff;font-size:20px;line-height:1;cursor:pointer}
.wc-tip{text-align:center;color:var(--muted);font-size:13px;margin:10px 0 0}

/* Responsive */
@media(max-width:980px){
  .detail-layout{grid-template-columns:1fr}
  .toc-aside{position:static;max-height:none;margin-top:20px}
  .list-layout{grid-template-columns:1fr}
  .cat-side{position:static}
  .pillar-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .archive-list{columns:1}
}
@media(max-width:640px){
  .main-nav ul{display:none;position:absolute;top:64px;right:0;background:#0e1730;flex-direction:column;
    padding:10px;min-width:160px;border-radius:0 0 0 12px}
  .main-nav ul.open{display:flex}
  .nav-toggle{display:block}
  .pillar-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .detail-main{padding:22px 18px}
  .float-capsule{right:10px}
  .cap{width:48px;height:48px}
}