:root{
  --bg:#ffffff; --bg-alt:#f4f7fb; --bg-soft:#eaeff6;
  --ink:#0b1f3a; --ink-2:#1a2c47; --muted:#5b6b82; --line:#e1e8f1;
  --brand:#0b1f3a; --brand-2:#133a6b; --cyan:#0ba5c4; --cyan-600:#0792ad;
  --amber:#f5a623; --amber-600:#e08e0b; --ok:#0d9488; --dark:#081526; --dark-2:#0c1f38;
  --radius:14px; --radius-sm:10px; --maxw:1200px;
  --shadow:0 1px 2px rgba(11,31,58,.05),0 10px 30px rgba(11,31,58,.07);
  --shadow-lg:0 18px 50px rgba(11,31,58,.14);
  --font:"Inter","Segoe UI",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"SFMono-Regular",ui-monospace,"JetBrains Mono",Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  line-height:1.72;-webkit-font-smoothing:antialiased;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{line-height:1.24;font-weight:800;letter-spacing:-.01em;margin:0 0 .5em}
h1{font-size:clamp(28px,4vw,44px)}
h2{font-size:clamp(23px,3vw,34px)}
h3{font-size:19px}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--cyan-600);font-weight:700;margin:0 0 14px}

/* buttons */
.btn-primary,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:999px;font-weight:700;font-size:15px;transition:.2s;border:1px solid transparent;cursor:pointer}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 10px 24px rgba(11,31,58,.22)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(11,31,58,.3)}
.btn-ghost{border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--cyan-600);color:var(--cyan-600)}
/* ghost button on dark surfaces (hero / 404) needs light text + visible border */
.hero .btn-ghost,.notfound .btn-ghost{color:#eaf1ff;border-color:rgba(120,200,255,.45);background:rgba(255,255,255,.04)}
.hero .btn-ghost:hover,.notfound .btn-ghost:hover{border-color:var(--cyan);color:#fff;background:rgba(255,255,255,.1)}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:18px;color:var(--ink);letter-spacing:-.01em}
.brand-mark{color:var(--cyan-600);display:inline-flex}
.site-nav{display:flex;align-items:center;gap:4px}
.site-nav a{padding:9px 14px;border-radius:10px;color:var(--muted);font-weight:600;font-size:15px;transition:.18s}
.site-nav a:hover{color:var(--ink);background:var(--bg-alt)}
.site-nav a.active{color:var(--brand);background:rgba(11,58,107,.08)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.2s}

/* hero */
.hero{position:relative;overflow:hidden;background:
  radial-gradient(120% 130% at 78% 0%,#133a6b 0%,#0b1f3a 52%,#081526 100%);color:#eaf1ff}
.hero-grid{position:absolute;inset:0;background-image:
  linear-gradient(rgba(120,200,255,.07) 1px,transparent 1px),
  linear-gradient(90deg,rgba(120,200,255,.07) 1px,transparent 1px);
  background-size:48px 48px;mask-image:radial-gradient(82% 82% at 62% 18%,#000 28%,transparent 76%)}
.hero-glow{position:absolute;width:540px;height:540px;right:-140px;top:-180px;border-radius:50%;
  background:radial-gradient(circle,rgba(11,165,196,.34),transparent 60%);filter:blur(18px)}
.hero-inner{position:relative;z-index:2;padding:104px 24px 112px;max-width:1000px;margin:0 auto;text-align:center}
.hero-title{font-size:clamp(32px,5.2vw,56px);line-height:1.08;color:#fff;margin:0 0 20px;font-weight:800}
.hero-sub{font-size:clamp(16px,2vw,20px);color:#b9cce6;max-width:780px;margin:0 auto 34px}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero .eyebrow{color:var(--cyan)}
.hero-pills{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:30px}
.hero-pill{font-family:var(--mono);font-size:13px;padding:7px 14px;border-radius:999px;
  border:1px solid rgba(120,200,255,.3);color:#cfe0ff;background:rgba(255,255,255,.04)}

/* measurement scale strip */
.scale-strip{position:relative;height:34px;margin-top:38px}
.scale-strip .ticks{position:absolute;inset:0;background-image:repeating-linear-gradient(90deg,
  rgba(255,255,255,.28) 0 1px,transparent 1px 40px);opacity:.5}
.scale-strip .lbl{position:absolute;bottom:2px;left:0;right:0;text-align:center;
  font-family:var(--mono);font-size:12px;color:#9fc0e0;letter-spacing:.1em}

/* stats */
.stats-band{border-bottom:1px solid var(--line);background:var(--bg-alt)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:34px 24px}
.stat{text-align:center;padding:10px}
.stat-value{font-size:clamp(24px,3.2vw,36px);font-weight:800;color:var(--brand);font-family:var(--mono);letter-spacing:-.02em}
.stat-label{color:var(--muted);font-size:14px;margin-top:4px}

/* sections */
.section{padding:86px 0}
.section-alt{background:var(--bg-alt)}
.section-dark{background:radial-gradient(120% 120% at 30% 0%,#133a6b,#081526);color:#eaf1ff}
.section-head{max-width:780px;margin:0 auto 50px;text-align:center}
.section-head h2{font-size:clamp(24px,3.2vw,36px)}
.section-head .section-sub{color:var(--muted);font-size:17px;margin-top:10px}
.section-head.light h2{color:#fff}
.section-head.light .section-sub{color:#a9c2e0}
.lead{max-width:820px;margin:0 auto;color:var(--muted);font-size:17px;text-align:center}

/* grids */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.center-cta{text-align:center;margin-top:42px}

/* cards */
.layer-card,.cat-card,.prod-card,.sol-card,.svc-card,.cap-card{background:var(--bg);border:1px solid var(--line);
  border-radius:var(--radius);padding:26px;transition:.22s;box-shadow:var(--shadow)}
.layer-card:hover,.cat-card:hover,.prod-card:hover,.sol-card:hover,.svc-card:hover,.cap-card:hover{transform:translateY(-4px);
  border-color:rgba(11,165,196,.5);box-shadow:var(--shadow-lg)}
.layer-icon{width:54px;height:54px;border-radius:13px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,rgba(11,165,196,.14),rgba(245,166,35,.12));color:var(--cyan-600);margin-bottom:16px}
.layer-card h3,.cat-card h3,.prod-card h3,.sol-card h3,.svc-card h3,.cap-card h3{font-size:19px;margin-bottom:10px}
.layer-card p,.cat-card p,.sol-card p,.svc-card p,.cap-card p{color:var(--muted);font-size:15px;margin:0}
.cap-card h3{color:var(--ink)}
.cap-card p{color:var(--muted)}

.cat-card{display:flex;flex-direction:column;gap:8px}
.cat-tag{font-family:var(--mono);font-size:12px;color:var(--cyan-600);letter-spacing:.04em}
.cat-link{margin-top:6px;color:var(--brand-2);font-weight:700;font-size:14px}

.prod-card{display:flex;flex-direction:column;overflow:hidden;padding:0}
.prod-visual{background:linear-gradient(135deg,#0b1f3a,#16365f);color:var(--cyan);display:flex;align-items:center;justify-content:center;padding:18px}
.prod-body{padding:20px 22px 24px}
.prod-cat{font-family:var(--mono);font-size:12px;color:var(--cyan-600);letter-spacing:.04em}
.prod-body h3{font-size:17px;margin:6px 0 8px}
.prod-body p{color:var(--muted);font-size:14px;margin:0}

.sol-card{display:flex;flex-direction:column;gap:12px}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:6px 0 0}
.chip{font-size:12.5px;padding:5px 11px;border-radius:999px;background:rgba(11,165,196,.1);color:var(--cyan-600);border:1px solid rgba(11,165,196,.18);font-weight:600}
.tick-list{list-style:none;padding:0;margin:12px 0 0;display:flex;flex-direction:column;gap:8px}
.tick-list li{position:relative;padding-left:22px;color:var(--muted);font-size:14.5px}
.tick-list li::before{content:"";position:absolute;left:0;top:9px;width:14px;height:8px;border-left:2px solid var(--ok);border-bottom:2px solid var(--ok);transform:rotate(-45deg)}

.svc-card{border-left:4px solid var(--amber)}
.svc-card h3{color:var(--brand)}

/* PRODUCT TREE (homepage) */
.tree-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.tree-col{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:24px 24px 18px;box-shadow:var(--shadow)}
.tree-col h3{font-size:18px;margin:0 0 4px;color:var(--brand)}
.tree-col .tree-sub{color:var(--muted);font-size:14px;margin:0 0 14px}
.tree-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:9px}
.tree-list li{display:flex;align-items:baseline;gap:10px;padding:9px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg-alt)}
.tree-list li .tk{font-family:var(--mono);font-size:12px;color:var(--cyan-600);flex:0 0 auto;font-weight:700}
.tree-list li a{font-weight:600;color:var(--ink)}
.tree-list li a:hover{color:var(--cyan-600)}
.tree-list li .tn{color:var(--muted);font-size:13.5px}

/* SCENARIO (接单场景) */
.scn-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.scn-card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.22s;box-shadow:var(--shadow)}
.scn-card:hover{transform:translateY(-4px);border-color:rgba(11,165,196,.5);box-shadow:var(--shadow-lg)}
.scn-no{font-family:var(--mono);font-size:16px;font-weight:800;color:#fff;background:var(--brand-2);width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.scn-card h3{font-size:18px;margin:0 0 8px;color:var(--brand)}
.scn-card p{color:var(--muted);font-size:14.5px;margin:0 0 12px}
.scn-card .chip-row{margin:0}

/* KEYWORD MATRIX (SEO) */
.kw-block{background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius);padding:30px}
.kw-head{display:flex;align-items:baseline;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.kw-head h2{margin:0;font-size:24px}
.kw-head .kw-note{color:var(--muted);font-size:14px}
.kw-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.kw-col h4{font-size:15px;color:var(--brand);margin:0 0 10px;border-bottom:2px solid var(--amber);padding-bottom:6px;display:inline-block}
.kw-col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:7px}
.kw-col li{font-size:14px;color:var(--muted);padding-left:16px;position:relative}
.kw-col li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--cyan-600)}
.kw-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.kw-tags span{font-size:13px;padding:5px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--ink-2);font-family:var(--mono)}

/* cta band */
.cta-band{background:linear-gradient(135deg,#081526,#10325c);color:#fff}
.cta-inner{max-width:780px;margin:0 auto;text-align:center;padding:74px 24px}
.cta-inner h2{color:#fff;font-size:clamp(24px,3vw,34px)}
.cta-inner p{color:#b9cce6;margin:12px 0 26px}

/* detail page */
.breadcrumb{padding:18px 0 0;font-size:13.5px;color:var(--muted)}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0}
.breadcrumb li:not(:last-child)::after{content:"/";margin-left:8px;color:var(--line)}
.breadcrumb a:hover{color:var(--cyan-600)}
.detail-head{padding:14px 0 26px;border-bottom:1px solid var(--line);margin-bottom:30px}
.detail-head .eyebrow{margin-bottom:10px}
.detail-head h1{font-size:clamp(26px,3.4vw,38px)}
.detail-summary{color:var(--muted);font-size:17px;max-width:840px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.tag-text{font-size:12.5px;padding:4px 12px;border-radius:999px;background:var(--bg-alt);border:1px solid var(--line);color:var(--muted)}
.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:40px;align-items:start}
.detail-main{min-width:0}
.spec-card{background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius);padding:22px;margin-bottom:30px}
.spec-title{font-size:16px;margin:0 0 12px}
.spec-table{width:100%;border-collapse:collapse;font-size:14.5px}
.spec-table th,.spec-table td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line)}
.spec-table th{color:var(--muted);font-weight:600;width:38%}
.spec-table tr:last-child td{border-bottom:0}
.scenario-card{margin-bottom:30px}
.scenario-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.scenario-list li{position:relative;padding-left:22px;color:var(--muted)}
.scenario-list li::before{content:"";position:absolute;left:0;top:9px;width:14px;height:8px;border-left:2px solid var(--cyan-600);border-bottom:2px solid var(--cyan-600);transform:rotate(-45deg)}
.related-block{margin-top:26px;padding-top:22px;border-top:1px solid var(--line)}
.related-list{list-style:none;padding:0;margin:10px 0 0;display:flex;flex-direction:column;gap:8px}
.related-list a{color:var(--cyan-600);font-weight:600}

/* prose */
.prose h2{font-size:24px;margin:38px 0 14px;padding-top:6px}
.prose h3{font-size:19px;margin:26px 0 10px}
.prose p{margin:0 0 16px;color:#27384f}
.prose ul,.prose ol{margin:0 0 16px;padding-left:22px;color:#27384f}
.prose li{margin:6px 0}
.prose strong{color:var(--ink)}
.prose a{color:var(--cyan-600);text-decoration:underline;text-underline-offset:3px}
.prose blockquote{margin:18px 0;padding:14px 18px;border-left:3px solid var(--cyan-600);background:var(--bg-alt);border-radius:0 10px 10px 0;color:#2c4a6e}
.prose blockquote p{margin:0;color:#34496b}
.prose table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.prose th{background:var(--bg-alt);font-weight:600}
.prose code{font-family:var(--mono);background:var(--bg-soft);padding:2px 6px;border-radius:5px;font-size:13.5px}
.callout{margin:20px 0;padding:16px 18px;border-radius:12px}
.callout-case{background:rgba(13,148,136,.08);border:1px solid rgba(13,148,136,.3)}
.callout-label{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--ok);margin:0 0 6px;font-weight:700}
.callout p{margin:0;color:#26453f}

/* toc */
.toc-aside{position:sticky;top:90px;max-height:calc(100vh - 110px);overflow-y:auto;font-size:14px}
.toc-title{font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:0 0 12px}
.toc-nav ul{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.toc-nav li a{display:block;padding:6px 14px;color:var(--muted);border-left:2px solid transparent;margin-left:-2px;transition:.15s}
.toc-nav li a:hover{color:var(--cyan-600);border-left-color:var(--cyan-600)}
.toc-l3 a{padding-left:28px!important;font-size:13px}

/* faq */
.faq-block{margin-top:40px;padding-top:30px;border-top:1px solid var(--line)}
.faq-block h2{font-size:22px;margin-bottom:16px}
.faq-list{display:flex;flex-direction:column;gap:10px}
.faq-item{border:1px solid var(--line);border-radius:12px;background:var(--bg);overflow:hidden}
.faq-item summary{cursor:pointer;padding:16px 18px;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:20px;color:var(--cyan-600);font-weight:400;transition:.2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-answer{padding:0 18px 16px;color:var(--muted);margin:0}

/* list page */
.list-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:40px;align-items:start;padding:10px 0 60px}
.cat-side{position:sticky;top:90px}
.cat-side-title{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 14px}
.category-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.category-list a{display:flex;justify-content:space-between;align-items:center;padding:11px 14px;border-radius:10px;color:var(--muted);font-weight:500;transition:.16s;border:1px solid transparent}
.category-list a:hover{background:var(--bg-alt);color:var(--ink)}
.category-list a.active{background:rgba(11,165,196,.1);color:var(--cyan-600);border-color:rgba(11,165,196,.25)}
.cat-count{font-family:var(--mono);font-size:12px;color:var(--muted);background:var(--bg-soft);padding:1px 8px;border-radius:999px}
.cat-head h1{font-size:clamp(24px,3vw,34px)}
.cat-desc{color:var(--muted);max-width:760px;margin-top:8px}
.item-list{list-style:none;margin:24px 0 0;padding:0;display:flex;flex-direction:column}
.item-row{padding:20px 0;border-bottom:1px solid var(--line)}
.item-title{font-size:19px;font-weight:700;color:var(--ink)}
.item-title:hover{color:var(--cyan-600)}
.item-meta{display:flex;gap:14px;color:var(--muted);font-size:13px;font-family:var(--mono);margin:6px 0}
.item-summary{color:var(--muted);margin:0;max-width:780px}

/* page / contact */
.contact-block{display:flex;justify-content:center;margin:38px 0 10px}
.wecom-card{text-align:center;background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 28px;max-width:400px;box-shadow:var(--shadow)}
.wecom-card h2{font-size:20px;margin-bottom:10px}
.wecom-hint{color:var(--muted);font-size:14.5px;margin:0 0 20px}
.wecom-img{width:100%;max-width:300px;height:auto;margin:0 auto;border-radius:14px;box-shadow:var(--shadow-lg)}
.wecom-extra{margin-top:22px;text-align:left}
.contact-list{list-style:none;padding:0;margin:16px 0;display:flex;flex-direction:column;gap:12px}
.contact-list li{display:flex;justify-content:space-between;border-bottom:1px dashed var(--line);padding-bottom:10px}
.ci-label{color:var(--muted)}
.ci-value{font-weight:600}

/* archive */
.archive-list{list-style:none;padding:0;margin:24px 0 0;display:flex;flex-direction:column}
.archive-row{display:grid;grid-template-columns:110px 70px 1fr auto;gap:16px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}
.archive-date{font-family:var(--mono);font-size:13px;color:var(--muted)}
.archive-type{font-size:12px;padding:3px 10px;border-radius:999px;text-align:center;font-weight:600}
.t-article{background:rgba(11,58,107,.1);color:var(--brand-2)}
.t-product{background:rgba(11,165,196,.12);color:#0792ad}
.archive-title{font-weight:600}
.archive-title:hover{color:var(--cyan-600)}
.archive-cat{color:var(--muted);font-size:13px}

/* solutions/services pages */
.sol-detail,.svc-row{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);margin-bottom:20px}
.sol-head,.svc-row-head{display:flex;align-items:center;gap:14px;margin-bottom:12px}
.sol-index,.svc-no{font-family:var(--mono);font-size:18px;font-weight:800;color:#fff;background:var(--brand-2);width:42px;height:42px;border-radius:10px;display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.text-link{color:var(--cyan-600);font-weight:600;font-size:14px}
.svc-row{border-left:4px solid var(--amber)}
.step-list{list-style:none;counter-reset:s;padding:0;margin:0;display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step-list li{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:24px;position:relative}
.step-no{font-family:var(--mono);font-size:22px;font-weight:800;color:var(--cyan-600)}
.step-list h3{font-size:17px;margin:8px 0 6px}

/* footer */
.site-footer{background:var(--dark);color:#9fb1d4;padding:64px 0 28px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:30px}
.footer-brand .brand{color:#fff}
.footer-brand .brand-text{color:#fff}
.footer-tag{color:#cfe0ff;font-weight:700;margin:14px 0 8px}
.footer-desc{font-size:14px;max-width:390px}
.footer-col h4{color:#fff;font-size:15px;margin:0 0 14px}
.footer-col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:9px}
.footer-col a{color:#9fb1d4;font-size:14px}
.footer-col a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;margin-top:40px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1);font-size:13px;color:#7e90b3}

/* float bar (right, vertically centered = middle) */
.float-bar{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:65;
  display:flex;flex-direction:column;gap:12px}
.float-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;
  width:60px;height:60px;padding:0;border:1px solid var(--line);border-radius:16px;background:#fff;
  color:#13365f;font-family:inherit;cursor:pointer;
  box-shadow:0 6px 20px rgba(11,31,58,.12);transition:.2s}
.float-btn:hover{border-color:var(--cyan-600);color:var(--cyan-600);transform:translateY(-2px)}
.float-btn .fb-icon{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.float-btn .fb-icon .dot{fill:currentColor;stroke:none}
.float-btn .fb-label{font-size:13px;font-weight:700;letter-spacing:.02em;line-height:1}

/* wecom card modal */
.wecom-modal{position:fixed;inset:0;z-index:90;display:flex;align-items:center;justify-content:center;padding:24px}
.wecom-modal[hidden]{display:none}
.wecom-mask{position:absolute;inset:0;background:rgba(8,21,38,.6)}
.wecom-dialog{position:relative;z-index:1;background:#fff;border-radius:18px;padding:16px;
  max-width:min(360px,90vw);max-height:86vh;overflow:auto;box-shadow:0 24px 60px rgba(8,21,38,.4)}
.wecom-dialog img{display:block;width:100%;max-width:300px;height:auto;border-radius:12px;margin:0 auto}
.wecom-dialog-close{position:absolute;right:-6px;top:-6px;width:32px;height:32px;border-radius:50%;border:none;
  background:var(--brand);color:#fff;font-size:18px;line-height:1;cursor:pointer}
.wecom-dialog-close:hover{background:var(--cyan-600)}

/* ad bar */
.adbar{position:fixed;left:0;right:0;bottom:0;z-index:70;display:flex;align-items:center;gap:14px;
  padding:11px 50px 11px 18px;background:linear-gradient(90deg,#0b1f3a,#103a72);color:#eaf1ff;
  border-top:1px solid rgba(120,200,255,.28);font-size:14px}
.adbar.hidden{display:none}
.adbar-link{display:flex;align-items:center;gap:12px;flex:1;min-width:0;color:inherit}
.adbar-tag{flex:none;font-size:11.5px;padding:2px 8px;border-radius:6px;background:rgba(255,255,255,.16);color:#cddfff;letter-spacing:.06em;font-weight:700}
.adbar-text{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.adbar-cta{flex:none;color:#ffd27f;font-weight:800}
.adbar-link:hover .adbar-cta{color:#ffe6b3}
.adbar-close{position:absolute;right:14px;top:50%;transform:translateY(-50%);width:28px;height:28px;
  border-radius:50%;border:1px solid rgba(255,255,255,.3);background:transparent;color:#cfe0ff;
  font-size:17px;line-height:1;cursor:pointer;transition:.2s}
.adbar-close:hover{background:rgba(255,255,255,.16);color:#fff}
body{padding-bottom:56px}

/* not found */
.notfound{background:radial-gradient(120% 120% at 70% 0%,#133a6b,#081526);color:#eaf1ff;min-height:70vh;display:flex;align-items:center}
.notfound-inner{text-align:center;padding:80px 24px}
.nf-code{font-family:var(--mono);font-size:80px;font-weight:800;color:var(--cyan);margin:0}
.notfound h1{color:#fff;font-size:34px;margin:6px 0 12px}
.nf-sub{color:#b9cce6;margin:0 0 26px}

/* responsive */
@media (max-width:1024px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .scn-grid{grid-template-columns:repeat(2,1fr)}
  .kw-cols{grid-template-columns:repeat(2,1fr)}
  .step-list{grid-template-columns:repeat(2,1fr)}
  .detail-layout{grid-template-columns:minmax(0,1fr) 210px}
}
@media (max-width:860px){
  .nav-toggle{display:flex}
  .site-nav{position:fixed;inset:68px 0 auto 0;flex-direction:column;align-items:stretch;gap:0;
    background:#fff;border-bottom:1px solid var(--line);padding:10px 16px 18px;transform:translateY(-130%);transition:.25s;box-shadow:var(--shadow)}
  .site-nav.open{transform:translateY(0)}
  .site-nav a{padding:12px 10px}
  .grid-2,.grid-3,.grid-4,.stats-grid,.tree-grid,.scn-grid,.kw-cols,.step-list,.contact-grid,.footer-grid{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .detail-layout,.list-layout{grid-template-columns:1fr}
  .toc-aside,.cat-side{position:static;max-height:none;margin-bottom:24px}
  .archive-row{grid-template-columns:80px 60px 1fr;gap:10px}
  .archive-cat{display:none}
  .adbar{font-size:13px;padding:10px 46px 10px 14px}
  .adbar-tag{display:none}
  .float-bar{right:10px;gap:10px}
  .float-btn{width:52px;height:52px;border-radius:14px;gap:5px}
  .float-btn .fb-icon{width:21px;height:21px}
  .float-btn .fb-label{font-size:12px}
}
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important;transition:none!important;animation:none!important}
}