:root{
  --bg:#ffffff; --bg-soft:#f4f8fb; --bg-deep:#0a1c33; --bg-deep2:#0f2a4d;
  --ink:#16202e; --ink-soft:#4a5a6e; --line:#e2eaf1;
  --brand:#0f6fe0; --brand-2:#11b3a3; --brand-ink:#0a3d8f;
  --accent:#13c2b0; --warn:#c8780e;
  --radius:14px; --shadow:0 10px 30px rgba(15,42,77,.08); --shadow-lg:0 18px 50px rgba(15,42,77,.16);
  --maxw:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg);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(--maxw);margin:0 auto;padding:0 20px}
h1,h2,h3,h4{line-height:1.3;color:var(--bg-deep)}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:18px;height:68px}
.brand{display:flex;align-items:center;gap:12px;color:var(--bg-deep)}
.brand-mark{font-size:30px;color:var(--brand);background:linear-gradient(135deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.brand-text strong{display:block;font-size:16px}
.brand-text em{display:block;font-style:normal;font-size:12px;color:var(--ink-soft)}
.site-nav{margin-left:auto;display:flex;gap:6px;flex-wrap:wrap}
.site-nav a{padding:8px 12px;border-radius:10px;color:var(--ink);font-size:14px}
.site-nav a:hover{background:var(--bg-soft);text-decoration:none;color:var(--brand)}
.nav-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 14px;cursor:pointer}

/* Footer */
.site-footer{background:var(--bg-deep);color:#cdd9e6;margin-top:60px;padding:48px 0 0}
.footer-inner{display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:30px}
.footer-col h3{color:#fff;font-size:15px;margin:0 0 12px}
.footer-col p{font-size:13.5px;color:#aab9cc;margin:0}
.footer-col ul{list-style:none;margin:0;padding:0}
.footer-col ul li{margin:6px 0}
.footer-col ul a{color:#bcd0e6;font-size:13.5px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);margin-top:36px;padding:16px 0;display:flex;justify-content:space-between;gap:12px;font-size:12.5px;color:#8295ab;flex-wrap:wrap}

/* Breadcrumb */
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:18px auto 0;padding:0 20px;max-width:var(--maxw);font-size:13px;color:var(--ink-soft)}
.breadcrumb li:not(:last-child)::after{content:"›";margin-left:8px;color:#b8c6d6}
.breadcrumb a{color:var(--ink-soft)}

/* Article / Page body */
.site-main{padding-bottom:30px}
.article-layout{max-width:var(--maxw);margin:24px auto 0;padding:0 20px;display:grid;grid-template-columns:minmax(0,760px) 240px;gap:36px;align-items:start}
.article-body{min-width:0}
.article-body h1{font-size:30px;margin:0 0 6px}
.doc-meta{color:var(--ink-soft);font-size:13px;margin-bottom:18px}
.summary-block{background:linear-gradient(180deg,#eef6ff,#f6fbff);border:1px solid #d8e8ff;border-left:4px solid var(--brand);border-radius:12px;padding:16px 18px;margin:0 0 16px;color:#1d3a5e;font-size:15px}
.keywords{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 20px}
.keywords .tag-text{background:var(--bg-soft);border:1px solid var(--line);color:var(--brand-ink);border-radius:999px;padding:4px 12px;font-size:12.5px}
.article-body h2{font-size:22px;margin:34px 0 12px;padding-top:8px;border-top:1px solid var(--line)}
.article-body h3{font-size:18px;margin:24px 0 10px}
.article-body p{margin:0 0 14px}
.article-body ul{margin:0 0 14px;padding-left:22px}
.article-body li{margin:6px 0}
.article-body table.data{border-collapse:collapse;width:100%;margin:0 0 18px;font-size:14px;box-shadow:var(--shadow)}
.article-body table.data th,.article-body table.data td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.article-body table.data th{background:var(--bg-soft);color:var(--bg-deep);font-weight:600}
.article-body table.data tr:nth-child(even) td{background:#fafcfe}
.callout{border-radius:12px;padding:14px 16px;margin:0 0 16px;background:#fff8ec;border:1px solid #f3e2bf;color:#6b4e12}
.callout strong{color:#8a5a00}
.conclusion-block{background:#eefaf7;border:1px solid #bfe9df;border-left:4px solid var(--accent);border-radius:12px;padding:14px 16px;margin:0 0 16px}
.conclusion-block ol{margin:8px 0 0;padding-left:22px}
.conclusion-block li{margin:6px 0}
.update-time{color:var(--ink-soft);font-size:12.5px;margin:6px 0 14px}

/* FAQ bare details */
.article-body details.faq-item,.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;margin:0 0 10px;padding:0}
.faq-item summary{cursor:pointer;padding:14px 16px;font-weight:600;color:var(--bg-deep);list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::before{content:"+";margin-right:10px;color:var(--brand);font-weight:700}
.faq-item[open] summary::before{content:"−"}
.faq-item .faq-a{padding:0 16px 14px;color:var(--ink-soft);font-size:14.5px}
.faq-section-title{font-size:20px;margin:30px 0 12px}

/* TOC */
.toc-aside{position:sticky;top:88px;max-height:calc(100vh - 110px);overflow-y:auto}
.toc-aside .toc-title{font-size:13px;color:var(--ink-soft);margin:0 0 8px;letter-spacing:.04em}
.toc-aside ol{list-style:none;margin:0;padding:0;border-left:2px solid var(--line)}
.toc-aside li a{display:block;padding:6px 12px;font-size:13px;color:var(--ink-soft);border-left:2px solid transparent;margin-left:-2px}
.toc-aside li a:hover{color:var(--brand);border-left-color:var(--brand);text-decoration:none}

/* Related */
.related-list{list-style:none;padding:0;margin:18px 0 0;display:grid;gap:10px}
.related-list li{background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.related-list a{font-weight:600}
.related-list span{display:block;color:var(--ink-soft);font-size:13px;margin-top:4px}

/* List / category page */
.cat-layout{max-width:var(--maxw);margin:24px auto 0;padding:0 20px;display:grid;grid-template-columns:240px minmax(0,1fr);gap:32px;align-items:start}
.cat-side{position:sticky;top:88px}
.category-list{list-style:none;margin:0;padding:0;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.category-list li a{display:block;padding:12px 16px;border-bottom:1px solid var(--line);color:var(--ink);font-size:14.5px}
.category-list li:last-child a{border-bottom:none}
.category-list li a:hover,.category-list li.active a{background:var(--bg-soft);color:var(--brand);text-decoration:none;font-weight:600}
.cat-content h1{font-size:28px;margin:0 0 6px}
.cat-intro{color:var(--ink-soft);margin:0 0 20px;font-size:15px}
.post-list{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.post-list li{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;box-shadow:var(--shadow);transition:.2s}
.post-list li:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.post-list h3{margin:0 0 6px;font-size:18px}
.post-list .excerpt{color:var(--ink-soft);font-size:14px;margin:0 0 10px}
.post-list .meta{font-size:12.5px;color:#93a4b8}
.pager{display:flex;gap:10px;margin:22px 0 0}
.pager a{padding:8px 14px;border:1px solid var(--line);border-radius:10px;font-size:13px}

/* Product card grid (within content) */
.prod-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin:0 0 18px}
.prod-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow)}
.prod-card h3{margin:0 0 8px;font-size:17px}
.prod-card p{font-size:13.5px;color:var(--ink-soft);margin:0 0 10px}
.prod-card .spec{font-size:12.5px;color:var(--brand-ink)}

/* Home */
.hero{background:radial-gradient(1200px 500px at 80% -10%,rgba(17,179,163,.18),transparent),linear-gradient(160deg,var(--bg-deep),var(--bg-deep2));color:#eaf2fb;padding:80px 0 70px}
.hero .container{display:grid;grid-template-columns:1.3fr .9fr;gap:40px;align-items:center}
.hero h1{color:#fff;font-size:42px;margin:0 0 16px;line-height:1.2}
.hero p.lead{font-size:17px;color:#bcd4ea;margin:0 0 22px}
.hero .tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:26px}
.hero .tags span{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);border-radius:999px;padding:6px 14px;font-size:13px;color:#dcebff}
.hero .cta{display:inline-flex;gap:12px}
.btn{display:inline-block;padding:12px 22px;border-radius:12px;font-weight:600;font-size:15px}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff}
.btn-ghost{border:1px solid rgba(255,255,255,.3);color:#eaf2fb}
.hero-stats{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.hero-stats .stat{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:14px;padding:18px}
.hero-stats .num{font-size:26px;font-weight:700;color:#7fe3d6}
.hero-stats .lab{font-size:13px;color:#aec6df}

.section{padding:56px 0}
.section.soft{background:var(--bg-soft)}
.section h2{font-size:28px;margin:0 0 6px;text-align:center}
.section .sub{text-align:center;color:var(--ink-soft);margin:0 0 30px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.feature{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;box-shadow:var(--shadow)}
.feature h3{margin:0 0 10px;font-size:18px;display:flex;align-items:center;gap:10px}
.feature .ico{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:18px}
.feature p{font-size:14px;color:var(--ink-soft);margin:0}
.mat-table{width:100%;border-collapse:collapse;background:#fff;border-radius:14px;overflow:hidden;box-shadow:var(--shadow);font-size:14.5px}
.mat-table th,.mat-table td{border-bottom:1px solid var(--line);padding:12px 14px;text-align:left}
.mat-table th{background:var(--bg-deep);color:#fff}
.mat-table tr:nth-child(even) td{background:#fafcfe}
.callout-band{background:linear-gradient(135deg,#eaf6ff,#eafaf6);border:1px solid #cfe7ff;border-radius:16px;padding:26px;margin-top:30px}
.callout-band h3{margin:0 0 8px}
.callout-band p{margin:0;color:var(--ink-soft)}

/* Float dock */
.float-dock{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:12px}
.capsule{display:flex;flex-direction:column;align-items:center;gap:2px;width:60px;padding:10px 6px;border:none;border-radius:16px;cursor:pointer;font-size:12px;color:#fff;background:linear-gradient(160deg,var(--brand),var(--brand-2));box-shadow:var(--shadow-lg);transition:.2s}
.capsule:hover{transform:translateY(-2px);text-decoration:none}
.capsule-ico{font-size:20px;line-height:1}
.capsule-txt{font-size:12px}
.capsule-top{background:linear-gradient(160deg,#2a3a52,#0f2a4d)}

.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(8,20,36,.6)}
.wechat-modal-card{position:relative;background:#fff;border-radius:18px;padding:18px;box-shadow:var(--shadow-lg);text-align:center}
.wechat-modal-close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;border:none;background:#fff;box-shadow:var(--shadow);font-size:20px;cursor:pointer;line-height:1}
.wechat-modal-title{margin:0 0 12px;font-weight:600;color:var(--bg-deep);font-size:15px}
.wechat-card-img{display:block;border-radius:12px;width:300px;height:500px;object-fit:contain;background:#f4f8fb}

/* Responsive */
@media (max-width:980px){
  .article-layout{grid-template-columns:1fr}
  .toc-aside{display:none}
  .cat-layout{grid-template-columns:1fr}
  .cat-side{position:static}
  .hero .container{grid-template-columns:1fr}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
}
@media (max-width:680px){
  .nav-toggle{display:block}
  .site-nav{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;flex-direction:column;padding:10px 20px;border-bottom:1px solid var(--line)}
  .site-nav.open{display:flex}
  .hero h1{font-size:30px}
  .float-dock{right:10px}
  .capsule{width:52px}
}