:root{
  --bg:#ffffff; --ink:#1b2129; --muted:#5b6675; --line:#e6e9ee;
  --slate:#0f172a; --slate2:#1b2433; --accent:#e0590f; --accent-d:#c14a08;
  --soft:#f6f8fa; --soft2:#eef1f5; --max:1200px;
  --serif:"Noto Serif SC",Georgia,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
h1,h2,h3,h4{line-height:1.3;font-weight:700;letter-spacing:.2px}
h1{font-size:clamp(28px,4vw,46px)}
h2{font-size:clamp(22px,3vw,30px)}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(160%) blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800}
.brand img{width:34px;height:34px;border-radius:8px}
.brand-text{display:flex;flex-direction:column;line-height:1.1;font-size:17px}
.brand-text small{font-weight:500;color:var(--muted);font-size:11px;letter-spacing:1px}
.site-nav{display:flex;gap:6px}
.site-nav a{padding:8px 14px;border-radius:8px;color:var(--ink);font-weight:600;font-size:15px;transition:.15s}
.site-nav a:hover{background:var(--soft2);color:var(--accent-d)}
.site-nav a.active{color:var(--accent-d);background:var(--soft2)}
.nav-toggle{display:none;background:none;border:0;font-size:26px;cursor:pointer;color:var(--ink)}

/* breadcrumb */
.crumb{padding:14px 24px 0;color:var(--muted);font-size:13px}
.crumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.crumb li{display:flex;align-items:center;gap:6px}
.crumb a:hover{color:var(--accent-d)}
.crumb .sep{color:#c2c9d2}
.crumb [aria-current]{color:var(--ink);font-weight:600}

/* hero */
.hero{background:radial-gradient(120% 120% at 80% 0%,#1b2433 0%,#0f172a 55%);color:#fff;padding:78px 0 64px;border-bottom:3px solid var(--accent)}
.hero-tag{display:inline-block;font-size:13px;letter-spacing:3px;color:var(--accent);border:1px solid rgba(224,89,15,.5);padding:5px 12px;border-radius:999px;margin-bottom:18px}
.hero h1{margin:0 0 18px;font-weight:800}
.hero-sub{max-width:760px;color:#c5ccd6;font-size:17px;margin:0 0 28px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-stats{display:flex;gap:40px;flex-wrap:wrap;margin-top:42px;padding-top:28px;border-top:1px solid rgba(255,255,255,.12)}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-size:26px;color:#fff}
.hero-stats span{font-size:13px;color:#9aa4b1;max-width:200px}

/* buttons */
.btn{display:inline-block;padding:12px 22px;border-radius:10px;font-weight:700;font-size:15px;transition:.15s;cursor:pointer;border:1px solid transparent}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-d)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}

/* bands */
.band{padding:64px 0}
.band-alt{background:var(--soft)}
.sec-h{margin:0 0 8px}
.sec-sub{color:var(--muted);margin:0 0 28px}

/* tiers */
.tier-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.tier{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px;position:relative;transition:.18s}
.tier:hover{transform:translateY(-3px);box-shadow:0 14px 36px rgba(15,23,42,.08);border-color:#cfd6df}
.tier-no{font-size:13px;font-weight:800;color:var(--accent);letter-spacing:2px}
.tier h3{margin:8px 0 10px;font-size:19px}
.tier p{color:var(--muted);margin:0;font-size:15px}

/* product grid */
.pro-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.pro-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;display:flex;flex-direction:column;gap:10px;min-height:120px;justify-content:space-between;transition:.18s}
.pro-card:hover{border-color:var(--accent);box-shadow:0 12px 30px rgba(224,89,15,.12)}
.pro-name{font-size:19px;font-weight:700}
.pro-go{color:var(--accent-d);font-weight:600;font-size:14px}

/* service list */
.svc-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:14px}
.svc-list li{background:#fff;border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:10px;padding:16px 18px;font-size:15px;color:var(--muted)}
.svc-list b{color:var(--ink);display:block;margin-bottom:4px;font-size:16px}

/* home articles */
.home-articles{list-style:none;margin:0 0 22px;padding:0;display:grid;gap:12px}
.home-articles li{display:flex;justify-content:space-between;align-items:center;gap:16px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px}
.home-articles a{font-weight:600}
.home-articles span{color:var(--accent-d);font-size:13px;white-space:nowrap}

/* cta band */
.cta-band{background:var(--slate);color:#fff;padding:60px 0;text-align:center}
.cta-inner h2{margin:0 0 10px}
.cta-inner p{color:#c5ccd6;margin:0 0 22px}

/* article layout */
.article-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:40px;padding-top:28px;padding-bottom:60px}
.article-body{max-width:760px}
.article-h1{margin:0 0 22px;font-size:clamp(26px,3.4vw,38px)}
.article-body h2{margin:38px 0 12px;padding-top:10px;border-top:1px solid var(--line)}
.article-body h3{margin:26px 0 10px}
.article-body p{margin:12px 0}
.article-body ul,.article-body ol{padding-left:22px;margin:12px 0}
.article-body table{border-collapse:collapse;width:100%;margin:18px 0;font-size:15px}
.article-body th,.article-body td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.article-body th{background:var(--soft)}
.article-body blockquote{margin:16px 0;padding:12px 18px;background:var(--soft);border-left:3px solid var(--accent);color:var(--muted);border-radius:0 8px 8px 0}
.article-body .lead{font-size:17px;color:var(--ink);background:linear-gradient(180deg,#fff,#fbfcfe);border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin:0 0 22px}
.article-body .keywords{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px}
.article-body .keywords .tag-text{background:var(--soft2);color:var(--ink);border-radius:999px;padding:4px 12px;font-size:13px;font-weight:600}
.article-body time{display:inline-block;color:var(--muted);font-size:13px;margin-bottom:8px}
.article-body details{border:1px solid var(--line);border-radius:10px;padding:4px 16px;margin:12px 0;background:#fff}
.article-body details summary{cursor:pointer;font-weight:700;padding:10px 0}
.article-body details p{margin:6px 0 12px}

/* toc */
.toc-aside{position:sticky;top:84px;align-self:start;max-height:calc(100vh - 104px);overflow-y:auto}
.toc{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:16px}
.toc-h{font-size:13px;font-weight:800;color:var(--muted);letter-spacing:2px;margin-bottom:10px}
.toc ul{list-style:none;margin:0;padding:0}
.toc li{margin:4px 0}
.toc li a{color:var(--muted);font-size:14px;display:block;padding:3px 0}
.toc li a:hover{color:var(--accent-d)}
.toc .lvl-3{padding-left:14px;font-size:13px}
.toc .lvl-3 a{color:#7a8392}

/* list page */
.list-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:40px;padding-top:28px;padding-bottom:60px}
.cat-side{position:sticky;top:84px;align-self:start}
.cat-side-h{font-size:13px;font-weight:800;color:var(--muted);letter-spacing:2px;margin-bottom:12px}
.category-list{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.category-list li a{display:block;padding:10px 16px;color:var(--ink);font-weight:600;border-radius:0 8px 8px 0;transition:.15s}
.category-list li a:hover{background:var(--soft2)}
.category-list li a.active{background:var(--soft2);color:var(--accent-d);border-left:3px solid var(--accent);margin-left:-2px}
.cat-content h1{margin:0 0 6px}
.cat-intro{color:var(--muted);margin:0 0 22px}
.item-list{list-style:none;margin:0;padding:0}
.item-row{border-bottom:1px solid var(--line);padding:16px 0}
.item-row.empty{color:var(--muted)}
.item-title{font-size:18px;font-weight:700}
.item-title:hover{color:var(--accent-d)}
.item-sum{color:var(--muted);margin:6px 0 0;font-size:14px}

/* product */
.product-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:40px;padding-top:28px;padding-bottom:60px}
.product-head{margin-bottom:22px}
.tag-cat{display:inline-block;background:var(--soft2);color:var(--accent-d);font-weight:700;font-size:13px;border-radius:999px;padding:4px 12px;margin-bottom:10px}
.product-head h1{margin:0 0 10px}
.product-desc{color:var(--muted);font-size:16px;margin:0;max-width:760px}
.spec-card{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin:8px 0 28px}
.spec-card h2{margin:0 0 12px;font-size:18px}
.spec-table{width:100%;border-collapse:collapse;margin:0;font-size:15px}
.spec-table th,.spec-table td{border:1px solid var(--line);padding:9px 12px;text-align:left;vertical-align:top}
.spec-table th{background:#fff;width:38%;font-weight:700;color:var(--ink)}
.spec-table td{background:#fff;color:var(--muted)}
.product-body{max-width:760px}
.product-body h2{margin:34px 0 12px}
.product-body h3{margin:24px 0 10px}
.product-body p{margin:12px 0}
.product-body ul{padding-left:22px}
.product-body table{border-collapse:collapse;width:100%;margin:16px 0;font-size:15px}
.product-body th,.product-body td{border:1px solid var(--line);padding:9px 12px}
.product-body th{background:var(--soft)}

/* related */
.related{padding:10px 24px 60px}
.related h3{margin:0 0 14px}
.related-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:12px}
.related-list a{display:block;background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px;font-weight:600}
.related-list a:hover{border-color:var(--accent);color:var(--accent-d)}

/* page body */
.page-body{max-width:820px;padding:30px 24px 64px}
.page-body h1{margin:0 0 18px}
.page-body h2{margin:34px 0 12px;border-top:1px solid var(--line);padding-top:14px}
.page-body h3{margin:24px 0 10px}
.page-body table{border-collapse:collapse;width:100%;margin:16px 0}
.page-body th,.page-body td{border:1px solid var(--line);padding:9px 12px}
.page-body th{background:var(--soft)}

/* footer */
.site-footer{background:var(--slate);color:#c5ccd6;padding:54px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:30px}
.f-brand{color:#fff;font-weight:800;font-size:18px;margin-bottom:10px}
.f-desc{font-size:14px;color:#9aa4b1;max-width:340px}
.site-footer h4{color:#fff;font-size:14px;margin:0 0 12px;letter-spacing:1px}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.site-footer a{color:#c5ccd6;font-size:14px}
.site-footer a:hover{color:#fff}
.f-note{font-size:13px;color:#9aa4b1}
.f-wechat{color:var(--accent);font-weight:700}
.f-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;margin-top:34px;padding-top:18px;border-top:1px solid rgba(255,255,255,.1);font-size:13px;color:#7a8392}

/* wechat fab */
.wechat-fab{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;width:54px;height:54px;border-radius:50%;border:0;background:var(--accent);color:#fff;font-weight:700;font-size:14px;cursor:pointer;box-shadow:0 8px 24px rgba(224,89,15,.4);transition:.15s}
.wechat-fab:hover{background:var(--accent-d);transform:translateY(-50%) scale(1.06)}
.wechat-modal{position:fixed;inset:0;z-index:80;background:rgba(15,23,42,.6);display:flex;align-items:center;justify-content:center;padding:20px}
.wechat-modal[hidden]{display:none}
.wechat-modal-box{background:#fff;border-radius:16px;padding:18px;max-width:340px;position:relative;text-align:center}
.wechat-modal-box img{width:280px;height:auto;border-radius:8px;margin:0 auto}
.wechat-note{font-size:13px;color:var(--muted);margin:12px 0 0}
.modal-close{position:absolute;top:8px;right:12px;background:none;border:0;font-size:24px;color:#9aa4b1;cursor:pointer;line-height:1}

/* back to top */
.to-top{position:fixed;right:18px;bottom:78px;z-index:60;width:46px;height:46px;border-radius:50%;border:0;background:var(--slate);color:#fff;font-size:20px;cursor:pointer;box-shadow:0 8px 20px rgba(15,23,42,.3);transition:.15s}
.to-top:hover{background:#000}
.to-top[hidden]{display:none}

/* ad bar */
.ad-bar{position:fixed;left:0;right:0;bottom:0;z-index:70;background:var(--slate2);border-top:2px solid var(--accent);display:flex;align-items:center;justify-content:center;gap:14px;padding:10px 44px;color:#fff}
.ad-bar[hidden]{display:none}
.ad-link{display:flex;flex-direction:column;align-items:center;text-align:center;color:#fff}
.ad-link:hover .ad-title{color:var(--accent)}
.ad-title{font-weight:800;font-size:15px}
.ad-text{font-size:13px;color:#aeb7c2}
.ad-close{position:absolute;right:14px;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.12);border:0;color:#fff;width:28px;height:28px;border-radius:50%;font-size:18px;cursor:pointer;line-height:1}
.ad-close:hover{background:rgba(255,255,255,.25)}

/* responsive */
@media(max-width:920px){
  .tier-grid,.pro-grid{grid-template-columns:1fr 1fr}
  .svc-list,.related-list{grid-template-columns:1fr}
  .article-layout,.product-layout,.list-layout{grid-template-columns:1fr}
  .toc-aside,.cat-side{position:static;max-height:none;margin-bottom:20px}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .site-nav{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:10px 24px;border-bottom:1px solid var(--line)}
  .site-nav.open{display:flex}
  .nav-toggle{display:block}
  .tier-grid,.pro-grid,.footer-grid{grid-template-columns:1fr}
  .hero-stats{gap:24px}
  .ad-text{display:none}
}