:root{
  --c-primary:#0A4D8C; --c-blue:#1488E8; --c-cyan:#14B8E8;
  --bg-soft:#F4F8FD; --bg-white:#FFFFFF; --bg-dark:#0A1A2F;
  --t-main:#16233A; --t-sub:#5C6B80; --t-inv:#FFFFFF;
  --fn-green:#16A34A; --fn-amber:#F59E0B; --fn-red:#DC2626;
  --radius:16px; --shadow:0 10px 30px rgba(10,74,140,.10);
  --shadow-lg:0 20px 50px rgba(10,74,140,.18);
  --h2-inset:16px; --maxw:1200px;
  --font:"PingFang SC","Roboto","Helvetica Neue",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--t-main);background:var(--bg-soft);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:var(--c-blue);text-decoration:none}
img{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ===== Header ===== */
.site-header{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(255,255,255,.0);transition:background .3s,box-shadow .3s}
.site-header.solid{background:rgba(255,255,255,.92);backdrop-filter:blur(12px);box-shadow:0 4px 20px rgba(10,74,140,.08)}
.site-header.always-solid{background:rgba(255,255,255,.92);backdrop-filter:blur(12px);box-shadow:0 4px 20px rgba(10,74,140,.08)}
.site-header.always-solid .brand{color:var(--t-main)}
.site-header.always-solid .main-nav>a,.site-header.always-solid .nav-group-btn{color:var(--t-main)}
.site-header.always-solid .nav-toggle span{background:var(--t-main)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;color:var(--t-inv);font-weight:700;font-size:18px}
.site-header.solid .brand{color:var(--t-main)}
.brand-mark{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--c-blue),var(--c-cyan));box-shadow:0 4px 12px rgba(20,136,232,.5)}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav>a,.nav-group-btn{color:var(--t-inv);padding:8px 14px;border-radius:10px;font-weight:600;background:none;border:none;cursor:pointer;font-size:15px;font-family:var(--font)}
.site-header.solid .main-nav>a,.site-header.solid .nav-group-btn{color:var(--t-main)}
.main-nav>a:hover,.nav-group-btn:hover{background:rgba(20,136,232,.14);color:var(--c-blue)}
.nav-group{position:relative}
.nav-group-panel{position:absolute;top:calc(100% - 1px);left:0;min-width:170px;background:#fff;border-radius:14px;box-shadow:var(--shadow-lg);padding:8px;display:none;flex-direction:column}
.nav-group:hover .nav-group-panel,.nav-group-btn[aria-expanded="true"]+.nav-group-panel{display:flex}
.nav-group-panel a{color:var(--t-main);padding:9px 12px;border-radius:9px;font-size:14px}
.nav-group-panel a:hover{background:var(--bg-soft);color:var(--c-blue)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:var(--t-inv);border-radius:2px;transition:.3s}
.site-header.solid .nav-toggle span{background:var(--t-main)}

/* ===== Hero ===== */
.hero{position:relative;padding:150px 0 90px;color:#fff;overflow:hidden}
.hero-bg{position:absolute;inset:0;background:radial-gradient(1200px 600px at 70% -10%,rgba(20,184,232,.55),transparent),linear-gradient(135deg,#0A1A2F 0%,#0A4D8C 55%,#1488E8 100%)}
.hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(10,26,47,.4),transparent)}
.hero-inner{position:relative;max-width:920px}
.hero-eyebrow{letter-spacing:2px;color:var(--c-cyan);font-weight:600;margin-bottom:14px}
.hero-title{font-size:44px;font-weight:800;line-height:1.25;margin-bottom:18px}
.hero-sub{font-size:17px;color:rgba(255,255,255,.86);max-width:760px;margin-bottom:26px}
.hero-cta{display:flex;gap:14px;margin-bottom:40px;flex-wrap:wrap}
.btn-primary{background:linear-gradient(135deg,var(--c-cyan),var(--c-blue));color:#fff;padding:13px 28px;border-radius:30px;font-weight:700;box-shadow:0 10px 26px rgba(20,136,232,.5);transition:transform .2s}
.btn-primary:hover{transform:translateY(-2px)}
.btn-ghost{border:1.5px solid rgba(255,255,255,.6);color:#fff;padding:13px 28px;border-radius:30px;font-weight:700;transition:.2s}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.hero-metrics{display:flex;gap:34px;flex-wrap:wrap;list-style:none}
.hero-metrics li{display:flex;flex-direction:column}
.hero-metrics b{font-size:26px;color:#fff}
.hero-metrics span{font-size:13px;color:rgba(255,255,255,.75)}

/* ===== Sections ===== */
.section{padding:72px 0}
.section-title{font-size:30px;font-weight:800;text-align:center;margin-bottom:10px}
.section-sub{text-align:center;color:var(--t-sub);margin-bottom:40px}
.section:nth-child(even){background:var(--bg-white)}

/* Product matrix */
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:22px}
.product-card{background:rgba(255,255,255,.7);backdrop-filter:blur(8px);border:1px solid rgba(20,136,232,.12);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.pc-icon{width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--c-blue),var(--c-cyan));margin-bottom:16px;box-shadow:0 8px 18px rgba(20,136,232,.4)}
.product-card h3{font-size:18px;margin-bottom:8px}
.product-card p{color:var(--t-sub);font-size:14px}

/* Solutions */
.sol-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:22px}
.sol-card{background:linear-gradient(160deg,#fff,#eef6ff);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);border-top:3px solid var(--c-cyan)}
.sol-card h3{font-size:18px;margin-bottom:10px}
.sol-card p{color:var(--t-sub);font-size:14px}

/* Article pick */
.pick-list{display:grid;gap:16px;max-width:860px;margin:0 auto}
.pick-list li{background:#fff;border-radius:14px;padding:20px 24px;box-shadow:var(--shadow);transition:transform .2s}
.pick-list li:hover{transform:translateX(6px)}
.pick-list a{font-size:18px;font-weight:700;color:var(--t-main)}
.pick-list p{color:var(--t-sub);font-size:14px;margin-top:6px}

/* Trust */
.trust{background:linear-gradient(135deg,#0A1A2F,#0A4D8C);color:#fff}
.trust .section-title{color:#fff}
.trust-text{max-width:820px;margin:0 auto 30px;text-align:center;color:rgba(255,255,255,.85)}
.trust-stats{display:flex;gap:40px;justify-content:center;flex-wrap:wrap;list-style:none}
.trust-stats b{font-size:30px;display:block;color:var(--c-cyan)}
.trust-stats span{font-size:13px;color:rgba(255,255,255,.75)}

/* ===== Article / Page layout ===== */
.article-layout{display:grid;grid-template-columns:minmax(0,760px) 240px;gap:32px;justify-content:center;padding-top:120px;padding-bottom:70px}
.article-main{min-width:0}
.article-title{font-size:34px;font-weight:800;margin-bottom:20px;line-height:1.3}
.article-body{font-size:16px;color:var(--t-main)}
.article-body h2{font-size:24px;font-weight:700;margin:34px 0 14px;padding-left:12px;border-left:4px solid var(--c-blue)}
.article-body h3{font-size:19px;font-weight:700;margin:24px 0 10px}
.article-body p{margin:12px 0}
.article-body ul,.article-body ol{margin:12px 0 12px 22px}
.article-body li{margin:6px 0}
.article-body table.data,.article-body table{border-collapse:collapse;width:100%;margin:18px 0;font-size:14px}
.article-body th,.article-body td{border:1px solid #d6e4f3;padding:10px 12px;text-align:left}
.article-body th{background:#eef6ff;font-weight:700}
.article-body blockquote{background:#eef6ff;border-left:4px solid var(--c-cyan);padding:12px 16px;margin:16px 0;border-radius:8px;color:var(--t-sub)}

/* Breadcrumb alignment (M18c++) */
.breadcrumb{margin-bottom:18px;font-size:13px;color:var(--t-sub);padding-left:var(--h2-inset)}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.breadcrumb a{color:var(--c-blue)}
.breadcrumb .crumb-current{color:var(--t-sub)}
.breadcrumb .crumb-sep{color:#b8c6d8}

/* TOC */
.toc-aside{position:sticky;top:90px;align-self:start;max-height:calc(100vh - 110px);overflow-y:auto;background:#fff;border:1px solid rgba(20,136,232,.12);border-radius:14px;padding:16px}
.toc-title{font-weight:700;font-size:14px;margin-bottom:10px;color:var(--t-main)}
.toc-nav{display:flex;flex-direction:column;gap:8px}
.toc-link{font-size:13px;color:var(--t-sub);padding-left:0;transition:.2s}
.toc-link:hover{color:var(--c-blue)}
.toc-l3{padding-left:14px;font-size:12px}

/* FAQ */
.faq-section{margin-top:36px}
.faq-heading{font-size:22px;font-weight:700;margin-bottom:14px}
.faq-item{border:1px solid #e0ebf7;border-radius:12px;margin-bottom:10px;background:#fff;overflow:hidden}
.faq-item summary{cursor:pointer;padding:14px 18px;font-weight:600;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::before{content:"+";color:var(--c-blue);font-weight:800;margin-right:10px}
.faq-item[open] summary::before{content:"−"}
.faq-answer{padding:0 18px 16px;color:var(--t-sub);font-size:15px}

/* Callout */
.callout{margin:22px 0;padding:16px 20px;border-radius:12px;background:linear-gradient(135deg,#eaf6ff,#f3fbff);border:1px solid rgba(20,136,232,.2)}
.callout-tag{display:inline-block;background:var(--c-blue);color:#fff;font-size:12px;padding:3px 10px;border-radius:20px;margin-bottom:8px}

/* ===== List layout ===== */
.list-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:30px;padding-top:120px;padding-bottom:70px}
.cat-side{position:sticky;top:100px;align-self:start;background:#fff;border-radius:14px;padding:18px;box-shadow:var(--shadow)}
.cat-side-title{font-weight:700;margin-bottom:12px;font-size:15px}
.category-list{list-style:none}
.category-list li{margin:4px 0}
.category-list a{display:block;padding:9px 12px;border-radius:9px;color:var(--t-main);font-size:14px;transition:.2s}
.category-list a:hover{background:var(--bg-soft);color:var(--c-blue)}
.category-list li.active a{background:linear-gradient(135deg,var(--c-blue),var(--c-cyan));color:#fff}
.list-title{font-size:28px;font-weight:800;margin-bottom:22px}
.item-list{display:flex;flex-direction:column;gap:16px}
.item-card{background:#fff;border-radius:14px;padding:22px 24px;box-shadow:var(--shadow);transition:transform .2s}
.item-card:hover{transform:translateY(-3px)}
.item-title{font-size:19px;font-weight:700;margin-bottom:8px}
.item-title a{color:var(--t-main)}
.item-title a:hover{color:var(--c-blue)}
.item-summary{color:var(--t-sub);font-size:14px}
.item-meta{margin-top:10px;display:flex;gap:14px;align-items:center;font-size:12px;color:var(--t-sub)}
.item-cat{background:#eef6ff;color:var(--c-blue);padding:2px 10px;border-radius:20px}
.empty-tip{color:var(--t-sub)}

/* ===== Page wrap ===== */
.page-wrap{padding-top:120px;padding-bottom:70px}
.page-main{max-width:820px;margin:0 auto}
.archive-list{list-style:none;display:flex;flex-direction:column;gap:12px}
.archive-list li{background:#fff;border-radius:10px;padding:14px 18px;box-shadow:var(--shadow)}
.archive-list time{color:var(--t-sub);font-size:13px;margin-right:12px}

/* ===== Footer ===== */
.site-footer{background:var(--bg-dark);color:#cdd9ea;padding:54px 0 24px}
.footer-inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer-col a{display:block;color:#aebfd4;font-size:14px;padding:4px 0}
.footer-col a:hover{color:var(--c-cyan)}
.footer-desc{font-size:13px;color:#8da3bd;margin-top:8px;max-width:280px}
.footer-bottom{max-width:var(--maxw);margin:30px auto 0;padding:18px 24px 0;border-top:1px solid rgba(255,255,255,.1);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#8da3bd}

/* ===== Float capsule ===== */
.float-capsule{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:10px}
.cap-btn{height:46px;padding:0 15px 0 13px;border-radius:23px;border:none;cursor:pointer;font-weight:600;font-size:13px;color:#fff;background:linear-gradient(135deg,var(--c-blue),var(--c-cyan));box-shadow:0 8px 20px rgba(20,136,232,.5);transition:transform .2s;display:inline-flex;align-items:center;gap:6px;white-space:nowrap;line-height:1}
.cap-btn svg{width:18px;height:18px;flex:none;display:block;fill:none;stroke:#fff;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.cap-btn:hover{transform:scale(1.08)}
.wechat-modal{position:fixed;inset:0;z-index:80;display:flex;align-items:center;justify-content:center}
.wechat-modal[hidden]{display:none}
.wechat-modal-mask{position:absolute;inset:0;background:rgba(10,26,47,.55);backdrop-filter:blur(3px)}
.wechat-card{position:relative;z-index:1}
.wechat-card img{display:block;width:300px;height:500px;object-fit:contain;background:#fff;border-radius:14px;box-shadow:var(--shadow-lg)}
.wechat-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;border:none;cursor:pointer;background:#fff;color:var(--t-main);font-size:20px;box-shadow:var(--shadow)}

/* ===== Responsive ===== */
@media (max-width:980px){
  .article-layout{grid-template-columns:1fr;padding-top:100px}
  .toc-aside{display:none}
  .list-layout{grid-template-columns:1fr}
  .cat-side{position:relative;top:0}
  .footer-inner{grid-template-columns:1fr 1fr}
  .hero-title{font-size:34px}
}
@media (max-width:680px){
  .main-nav{position:fixed;top:64px;right:0;width:240px;background:#fff;flex-direction:column;align-items:stretch;padding:12px;box-shadow:var(--shadow-lg);border-radius:0 0 0 16px;display:none}
  .main-nav.open{display:flex}
  .main-nav>a,.nav-group-btn{color:var(--t-main)!important;text-align:left}
  .nav-group-panel{position:relative;top:0;box-shadow:none;padding-left:12px}
  .nav-toggle{display:flex}
  .site-header,.site-header.solid{background:rgba(255,255,255,.95)}
  .brand,.site-header.solid .brand{color:var(--t-main)}
  .nav-toggle span{background:var(--t-main)!important}
  .hero{padding:120px 0 60px}
  .hero-title{font-size:27px}
  .hero-metrics{gap:20px}
  .footer-inner{grid-template-columns:1fr}
  .float-capsule{right:10px}
  .cap-btn{height:42px;padding:0 12px 0 10px;font-size:12px}
  .cap-btn svg{width:16px;height:16px}
}