:root{
  --bg:#0a0f1a;
  --bg-2:#0e1626;
  --surface:#111c30;
  --surface-2:#16233c;
  --line:rgba(120,160,210,.16);
  --line-strong:rgba(120,160,210,.32);
  --text:#e8eef7;
  --text-dim:#9fb0c6;
  --text-mute:#6f8099;
  --accent:#2fd4d4;
  --accent-2:#3b82f6;
  --accent-grad:linear-gradient(120deg,#2fd4d4,#3b82f6);
  --warn:#f5a524;
  --radius:14px;
  --radius-sm:10px;
  --maxw:1200px;
  --shadow:0 18px 50px -28px rgba(0,0,0,.8);
  --font:"PingFang SC","Microsoft YaHei","Segoe UI",system-ui,-apple-system,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{
  margin:0;background:var(--bg);color:var(--text);font-family:var(--font);
  font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{line-height:1.3;font-weight:700;color:#fff;margin:0 0 .6em}
h1{font-size:clamp(30px,5vw,52px);letter-spacing:-.5px}
h2{font-size:clamp(24px,3.4vw,34px);margin-top:1.6em}
h3{font-size:clamp(19px,2.4vw,24px);margin-top:1.3em}
p{margin:0 0 1.1em}
.container{width:min(100% - 36px,var(--maxw));margin-inline:auto}
.skip-link{position:absolute;left:-999px;top:0;background:var(--accent);color:#04121a;padding:10px 16px;z-index:200;border-radius:0 0 8px 0}
.skip-link:focus{left:0}

/* Header */
.site-header{position:sticky;top:0;z-index:60;background:rgba(10,15,26,.82);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:#fff;font-size:18px}
.brand:hover{text-decoration:none}
.brand-mark{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--accent-grad);color:#04121a;font-size:18px;font-weight:800}
.brand-dot{color:var(--accent)}
.main-nav{display:flex;align-items:center}
.nav-list{display:flex;gap:6px;list-style:none;margin:0;padding:0}
.nav-list a{display:block;padding:8px 13px;border-radius:999px;color:var(--text-dim);font-size:15px;transition:.2s}
.nav-list a:hover{color:#fff;background:var(--surface-2);text-decoration:none}
.nav-list a.active{color:#04121a;background:var(--accent)}
.nav-toggle{display:none;background:var(--surface-2);color:var(--text);border:1px solid var(--line);border-radius:9px;padding:8px 14px;font-size:14px;cursor:pointer}

/* Hero */
.hero{position:relative;overflow:hidden;padding:clamp(48px,8vw,96px) 0;background:
  radial-gradient(900px 420px at 78% -10%,rgba(47,212,212,.18),transparent 60%),
  radial-gradient(700px 380px at 10% 110%,rgba(59,130,246,.18),transparent 60%),
  linear-gradient(180deg,var(--bg-2),var(--bg))}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero .eyebrow{display:inline-block;color:var(--accent);border:1px solid var(--line-strong);padding:5px 12px;border-radius:999px;font-size:13px;letter-spacing:.5px;margin-bottom:18px}
.hero h1{margin-bottom:.4em}
.hero .lead{color:var(--text-dim);font-size:18px;max-width:36em}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 22px;border-radius:11px;font-weight:600;font-size:15px;cursor:pointer;border:1px solid transparent;transition:.2s}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-primary{background:var(--accent-grad);color:#04121a}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--line-strong)}
.btn-ghost:hover{background:var(--surface-2)}
.hero-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:34px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px 18px}
.stat b{display:block;font-size:26px;color:#fff}
.stat span{color:var(--text-mute);font-size:13px}
.hero-card{background:linear-gradient(160deg,var(--surface-2),var(--surface));border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:var(--shadow)}
.hero-card h3{margin-top:0}
.spec-row{display:flex;justify-content:space-between;gap:12px;padding:11px 0;border-bottom:1px dashed var(--line);font-size:14px}
.spec-row:last-child{border-bottom:0}
.spec-row span:first-child{color:var(--text-mute)}
.spec-row span:last-child{color:var(--text);text-align:right}

/* Sections / layout */
.section{padding:clamp(40px,6vw,76px) 0}
.section-head{max-width:46em;margin-bottom:34px}
.section-head .eyebrow{color:var(--accent);font-size:13px;letter-spacing:.6px;text-transform:uppercase}
.section-head h2{margin:.2em 0 .3em}
.section-head p{color:var(--text-dim)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.22s}
.card:hover{border-color:var(--line-strong);transform:translateY(-3px);box-shadow:var(--shadow)}
.card h3{margin-top:0;font-size:19px}
.card p{color:var(--text-dim);font-size:14.5px;margin:.4em 0 0}
.card .tag{display:inline-block;font-size:12px;color:var(--accent);border:1px solid var(--line-strong);padding:3px 9px;border-radius:999px;margin-bottom:10px}
.card .more{margin-top:14px;font-size:14px;color:var(--accent)}
.icon-badge{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:var(--surface-2);border:1px solid var(--line);font-size:20px;margin-bottom:14px}

/* Feature list */
.feature{display:flex;gap:14px;align-items:flex-start;padding:14px 0;border-bottom:1px solid var(--line)}
.feature:last-child{border-bottom:0}
.feature .num{flex:0 0 auto;width:30px;height:30px;border-radius:8px;background:var(--accent-grad);color:#04121a;display:grid;place-items:center;font-weight:700;font-size:14px}
.feature h4{margin:0 0 2px;font-size:16px}
.feature p{margin:0;color:var(--text-dim);font-size:14px}

/* Callout */
.callout{background:linear-gradient(120deg,rgba(47,212,212,.1),rgba(59,130,246,.08));border:1px solid var(--line-strong);border-left:3px solid var(--accent);border-radius:var(--radius-sm);padding:16px 18px;margin:22px 0}
.callout strong{color:#fff}
.note{color:var(--text-mute);font-size:13.5px}

/* Breadcrumb */
.breadcrumb{font-size:13.5px;color:var(--text-mute);padding:18px 0 0}
.breadcrumb a{color:var(--text-dim)}
.breadcrumb span.sep{margin:0 8px;opacity:.5}
.breadcrumb span.cur{color:var(--text)}

/* Article / product layout */
.doc-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:40px;align-items:start;padding-top:8px}
.doc-main{max-width:760px}
.doc-main p{color:var(--text-dim)}
.doc-main h2{color:#fff;border-top:1px solid var(--line);padding-top:.9em}
.doc-main h3{color:#eaf2ff}
.doc-aside{position:sticky;top:80px;max-height:calc(100vh - 100px);overflow:auto}
.toc{border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px 18px;background:var(--surface)}
.toc h4{margin:0 0 10px;font-size:14px;color:var(--text-mute);text-transform:uppercase;letter-spacing:.5px}
.toc ol{margin:0;padding-left:18px;font-size:14px}
.toc li{margin:6px 0}
.toc a{color:var(--text-dim)}
.toc a:hover{color:var(--accent)}

.meta-line{display:flex;flex-wrap:wrap;gap:10px;align-items:center;color:var(--text-mute);font-size:13.5px;margin:6px 0 18px}
.keywords{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 6px}
.keywords .kw{background:var(--surface-2);border:1px solid var(--line);color:var(--text-dim);padding:4px 11px;border-radius:999px;font-size:13px}
.tag-text{display:inline-block;background:var(--surface-2);border:1px solid var(--line);color:var(--text-dim);padding:3px 10px;border-radius:999px;font-size:12.5px;margin:3px 4px 0 0}
.updatetime{color:var(--text-mute);font-size:13px}

/* Tables */
table{border-collapse:collapse;width:100%;margin:18px 0;font-size:14.5px;background:var(--surface);border-radius:var(--radius-sm);overflow:hidden}
th,td{border:1px solid var(--line);padding:10px 13px;text-align:left;vertical-align:top}
th{background:var(--surface-2);color:#fff;font-weight:600}
tbody tr:nth-child(even){background:rgba(255,255,255,.02)}

/* FAQ */
.faq details{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface);margin:10px 0;padding:0 16px}
.faq details[open]{background:var(--surface-2)}
.faq summary{cursor:pointer;padding:14px 0;font-weight:600;color:#fff;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";color:var(--accent);margin-right:10px;font-weight:700}
.faq details[open] summary::before{content:"−"}
.faq details p{margin:0 0 14px;color:var(--text-dim)}

/* Related */
.related{margin-top:34px;border-top:1px solid var(--line);padding-top:22px}
.related h3{font-size:19px}
.related ul{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:12px}
.related li a{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:13px 15px;color:var(--text);font-size:14.5px}
.related li a:hover{border-color:var(--line-strong);text-decoration:none;color:#fff}
.related li small{display:block;color:var(--text-mute);margin-top:4px;font-size:12.5px}

/* Category list (left sidebar) */
.cat-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:36px;align-items:start;padding-top:10px}
.cat-side{position:sticky;top:80px}
.category-list{list-style:none;margin:0;padding:0;border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;background:var(--surface)}
.category-list li a{display:block;padding:13px 16px;color:var(--text-dim);border-bottom:1px solid var(--line);font-size:14.5px}
.category-list li:last-child a{border-bottom:0}
.category-list li a:hover,.category-list li a.active{background:var(--surface-2);color:#fff;text-decoration:none}
.cat-content h1{margin-top:.1em}
.list-item{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px 20px;margin-bottom:14px;color:var(--text);transition:.2s}
.list-item:hover{border-color:var(--line-strong);text-decoration:none;transform:translateY(-2px)}
.list-item h3{margin:0 0 6px;font-size:18px}
.list-item p{margin:0;color:var(--text-dim);font-size:14px}
.list-item .meta{color:var(--text-mute);font-size:12.5px;margin-top:8px}

/* Footer */
.site-footer{background:var(--bg-2);border-top:1px solid var(--line);padding:54px 0 26px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.footer-col h3{font-size:15px;color:var(--text-mute);text-transform:uppercase;letter-spacing:.5px;margin-bottom:14px}
.footer-col ul{list-style:none;margin:0;padding:0}
.footer-col li{margin:8px 0}
.footer-col a{color:var(--text-dim);font-size:14px}
.footer-col a:hover{color:var(--accent)}
.footer-tagline{color:var(--text-mute);font-size:14px;max-width:30em;margin-top:12px}
.footer-bottom{border-top:1px solid var(--line);margin-top:34px;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:var(--text-mute);font-size:13px}
.footer-note{margin:0}

/* Float tools */
.float-tool{position:fixed;right:18px;top:50%;transform:translateY(-50%);z-index:70;display:flex;flex-direction:column;gap:12px}
.float-btn{width:54px;height:54px;border-radius:16px;border:1px solid var(--line-strong);background:var(--surface-2);color:var(--text);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;cursor:pointer;box-shadow:var(--shadow);transition:.2s}
.float-btn:hover{border-color:var(--accent);transform:scale(1.05)}
.float-wechat{background:var(--accent-grad);color:#04121a;border-color:transparent}
.float-ico{font-size:20px;line-height:1}
.float-label{font-size:11px}
.float-btn[hidden]{display:none}

/* Modal */
.modal-mask{position:fixed;inset:0;background:rgba(4,9,18,.74);backdrop-filter:blur(4px);display:grid;place-items:center;z-index:120;padding:20px}
.modal-mask[hidden]{display:none}
.modal-card{position:relative;background:var(--surface);border:1px solid var(--line-strong);border-radius:18px;padding:26px;max-width:380px;text-align:center;box-shadow:var(--shadow)}
.modal-title{margin:0 0 6px;font-size:20px}
.modal-sub{color:var(--text-dim);font-size:14px;margin:0 0 14px}
.wechat-card-img{width:300px;max-width:100%;height:auto;margin:0 auto;border-radius:12px;background:#fff}
.modal-tip{color:var(--text-mute);font-size:12.5px;margin:14px 0 0}
.modal-close{position:absolute;top:10px;right:14px;background:transparent;border:0;color:var(--text-dim);font-size:26px;cursor:pointer;line-height:1}

/* Ad bar */
.ad-bar{position:fixed;left:0;right:0;bottom:0;z-index:80;background:linear-gradient(90deg,#0c2230,#0e2c3e);border-top:1px solid var(--line-strong);display:flex;align-items:center;justify-content:center;gap:12px;padding:11px 48px 11px 18px;box-shadow:0 -10px 30px -16px rgba(0,0,0,.8)}
.ad-bar[hidden]{display:none}
.ad-link{display:flex;align-items:center;gap:12px;color:var(--text);text-decoration:none;font-size:14.5px}
.ad-link:hover{text-decoration:none}
.ad-link strong{color:var(--accent)}
.ad-badge{background:var(--accent-grad);color:#04121a;font-weight:700;font-size:12px;padding:4px 10px;border-radius:999px}
.ad-close{position:absolute;right:14px;top:50%;transform:translateY(-50%);background:transparent;border:0;color:var(--text-dim);font-size:24px;cursor:pointer;line-height:1}
.ad-close:hover{color:#fff}
body.has-ad{padding-bottom:52px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:start}
.contact-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.contact-card img{max-width:280px;margin:10px auto 0;background:#fff;border-radius:12px}
.contact-list{list-style:none;margin:14px 0 0;padding:0}
.contact-list li{padding:10px 0;border-bottom:1px solid var(--line);color:var(--text-dim);font-size:14.5px}
.contact-list li b{color:#fff}

/* Misc */
.archive-year{font-size:14px;color:var(--text-mute);margin:24px 0 10px;text-transform:uppercase;letter-spacing:.5px}
.eyebrow-cap{color:var(--accent);font-size:13px;letter-spacing:.6px;text-transform:uppercase}
.pill{display:inline-block;padding:4px 11px;border-radius:999px;font-size:12.5px;background:var(--surface-2);border:1px solid var(--line);color:var(--text-dim);margin:0 6px 8px 0}
.divider{height:1px;background:var(--line);margin:40px 0}
.banner-notice{background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--warn);border-radius:var(--radius-sm);padding:14px 18px;color:var(--text-dim);font-size:14px}

/* Responsive */
@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:30px}
  .doc-layout{grid-template-columns:1fr}
  .doc-aside{position:static;max-height:none;margin-bottom:20px}
  .toc{position:static}
  .cat-layout{grid-template-columns:1fr}
  .cat-side{position:static}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:720px){
  .nav-toggle{display:block}
  .nav-list{display:none;position:absolute;top:64px;right:0;left:0;background:var(--bg-2);border-bottom:1px solid var(--line);flex-direction:column;padding:10px 18px;gap:4px}
  .nav-list.open{display:flex}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .related ul{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:1fr 1fr}
  .ad-text{font-size:13px}
}