:root{
  --bg:#f5f7fb; --surface:#ffffff; --ink:#0e1726; --ink-soft:#46546b;
  --line:#e3e9f2; --primary:#1f6feb; --primary-d:#0b4fc4;
  --accent:#22d3ee; --accent-d:#0891b2; --dark:#0b1220; --dark-2:#111d36;
  --radius:14px; --shadow:0 10px 30px rgba(15,30,60,.08);
  --maxw:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
h1,h2,h3,h4{line-height:1.3;color:var(--ink)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}

/* ===== Header ===== */
.site-header{position:sticky;top:0;z-index:50;background:linear-gradient(100deg,var(--dark),var(--dark-2));
  color:#fff;box-shadow:0 6px 24px rgba(0,0,0,.18)}
.hdr-inner{max-width:var(--maxw);margin:0 auto;padding:12px 20px;display:flex;align-items:center;gap:22px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:700}
.brand:hover{text-decoration:none}
.brand-logo{border-radius:8px;background:#fff;padding:2px}
.brand-name{display:flex;flex-direction:column;line-height:1.05;font-size:18px}
.brand-name small{font-size:11px;font-weight:500;color:#9fb3d1;letter-spacing:.12em}
.top-nav{margin-left:auto;display:flex;gap:22px}
.top-nav a{color:#dce6f5;font-size:15px;padding:6px 2px;border-bottom:2px solid transparent}
.top-nav a:hover{color:#fff;text-decoration:none;border-color:var(--accent)}
.drawer-toggle{display:none;margin-left:auto;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);
  color:#fff;border-radius:10px;padding:8px 12px;font-size:14px;cursor:pointer}
.drawer{display:none;background:var(--dark-2);padding:14px 20px;color:#cdd9ec}
.drawer.open{display:block}
.drawer-sec h4{margin:10px 0 6px;color:#fff;font-size:14px;letter-spacing:.05em}
.drawer-sec ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.drawer-sec a{color:#cdd9ec;background:rgba(255,255,255,.06);padding:6px 10px;border-radius:8px;font-size:13px}
.drawer-sec a:hover{color:#fff;background:rgba(34,211,238,.18);text-decoration:none}

/* ===== Breadcrumb ===== */
.breadcrumb{max-width:var(--maxw);margin:14px auto 0;padding:0 20px}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0;font-size:13px;color:var(--ink-soft)}
.breadcrumb li:not(:last-child)::after{content:"›";margin-left:6px;color:#aab6c8}
.breadcrumb a{color:var(--ink-soft)}
.breadcrumb .current{color:var(--ink);font-weight:600}

/* ===== Layout doc ===== */
.layout{max-width:var(--maxw);margin:18px auto 40px;padding:0 20px}
.doc-layout{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:36px;align-items:start}
.doc-main{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:34px 40px;box-shadow:var(--shadow)}
.doc-head h1{font-size:30px;margin:.2em 0 .4em}
.doc-summary{font-size:16px;color:var(--ink-soft);background:#f1f6ff;border-left:4px solid var(--primary);
  padding:12px 16px;border-radius:0 8px 8px 0;margin:0 0 16px}
.doc-keywords{font-size:13px;color:var(--ink-soft)}
.doc-update{font-size:13px;color:#8a98ad}
.markdown-body h2{font-size:22px;margin:1.6em 0 .6em;padding-top:.3em;border-top:1px solid var(--line)}
.markdown-body h3{font-size:18px;margin:1.3em 0 .5em}
.markdown-body p{margin:.7em 0}
.markdown-body ul,.markdown-body ol{padding-left:1.4em}
.markdown-body table.data{border-collapse:collapse;width:100%;margin:1em 0;font-size:14px}
.markdown-body table.data th,.markdown-body table.data td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.markdown-body table.data thead th{background:#eef4ff;color:var(--ink)}
.markdown-body table.data tbody tr:nth-child(even){background:#fafcff}
.markdown-body code{background:#eef1f6;padding:1px 6px;border-radius:5px;font-size:13px}

/* ===== TOC ===== */
.toc-aside{position:sticky;top:84px;max-height:calc(100vh - 100px);overflow-y:auto}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;box-shadow:var(--shadow)}
.toc-title{margin:0 0 8px;font-size:13px;color:var(--ink-soft);letter-spacing:.06em}
.toc ul{list-style:none;margin:0;padding:0}
.toc li{margin:4px 0}
.toc li.lvl-3{padding-left:14px;font-size:14px}
.toc a{color:var(--ink-soft);font-size:14px}
.toc a:hover{color:var(--primary);text-decoration:none}

/* ===== FAQ ===== */
.faq{margin-top:28px}
.faq h2{font-size:22px}
.faq details{border:1px solid var(--line);border-radius:10px;margin:10px 0;background:#fbfdff;overflow:hidden}
.faq summary{cursor:pointer;padding:12px 16px;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"+";color:var(--primary);font-weight:700;margin-right:8px}
.faq details[open] summary::before{content:"−"}
.faq-a{padding:0 16px 14px;color:var(--ink-soft)}

/* ===== Case study ===== */
.case-study{margin-top:24px;background:linear-gradient(100deg,#eef5ff,#f3fbff);
  border:1px solid #cfe0ff;border-radius:12px;padding:14px 18px}
.case-study strong{color:var(--primary-d)}
.case-study p{margin:6px 0 0;color:var(--ink-soft);font-size:14px}

/* ===== Hero / Bands ===== */
.hero{position:relative;overflow:hidden;color:#fff;padding:66px 0 62px;
  background:
    radial-gradient(900px 380px at 80% -20%,rgba(34,211,238,.30),transparent 60%),
    radial-gradient(720px 440px at 5% 125%,rgba(31,111,235,.30),transparent 62%),
    linear-gradient(125deg,#0b1220,#111d36 58%,#0d1930)}
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:46px 46px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.55),transparent 78%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.55),transparent 78%)}
.hero-inner{max-width:var(--maxw);margin:0 auto;padding:0 20px;position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:46px;align-items:center}
.hero-kicker{display:inline-block;color:#7fe9fb;letter-spacing:.14em;font-size:12px;text-transform:uppercase;
  margin:0 0 16px;border:1px solid rgba(127,233,251,.35);background:rgba(34,211,238,.10);
  padding:5px 13px;border-radius:999px}
.hero-title{font-size:44px;line-height:1.18;margin:0 0 18px;font-weight:800;color:#fff;letter-spacing:.01em}
.hero-title .hl{display:block;margin-top:10px;font-size:29px;font-weight:700;line-height:1.25;
  background:linear-gradient(100deg,#7fe9fb,#a9bcff);-webkit-background-clip:text;background-clip:text;
  color:transparent;-webkit-text-fill-color:transparent}
.hero-sub{max-width:640px;color:#c1cfe6;font-size:16.5px;margin:0 0 26px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:30px}
.hero-stats{list-style:none;margin:0;padding:18px 0 0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:14px;border-top:1px solid rgba(255,255,255,.13)}
.hero-stats li{display:flex;flex-direction:column;gap:3px}
.hero-stats b{font-size:19px;color:#fff;font-weight:800}
.hero-stats span{font-size:12.5px;color:#8fa3c2}
.hero-visual{justify-self:stretch}
.ladder{background:linear-gradient(160deg,rgba(255,255,255,.10),rgba(255,255,255,.03));
  border:1px solid rgba(255,255,255,.15);border-radius:18px;padding:22px 20px;
  box-shadow:0 26px 60px rgba(3,8,18,.5)}
.ladder-cap{font-size:12px;letter-spacing:.14em;color:#8fa3c2;text-transform:uppercase;margin-bottom:16px}
.ladder-row{display:grid;grid-template-columns:98px 1fr 62px;align-items:center;gap:12px;margin:13px 0}
.lname{font-size:13px;color:#dbe6f7}
.lbar{height:9px;border-radius:999px;background:linear-gradient(90deg,var(--primary),var(--accent));
  width:var(--w,40%);box-shadow:0 0 14px rgba(34,211,238,.35)}
.lval{font-size:12.5px;color:#9fe9f8;text-align:right;font-variant-numeric:tabular-nums}
.btn{display:inline-block;padding:12px 22px;border-radius:10px;font-weight:600;font-size:15px}
.btn-primary{background:linear-gradient(120deg,var(--primary),var(--accent-d));color:#fff;
  box-shadow:0 10px 24px rgba(31,111,235,.35)}
.btn-primary:hover{text-decoration:none;filter:brightness(1.07);transform:translateY(-1px)}
.btn-ghost{border:1px solid rgba(255,255,255,.42);color:#fff}
.btn-ghost:hover{text-decoration:none;background:rgba(255,255,255,.12)}
.band{max-width:var(--maxw);margin:0 auto;padding:54px 20px}
.band-alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  max-width:none;padding-left:0;padding-right:0}
.band-alt>*{max-width:var(--maxw);margin-left:auto;margin-right:auto;padding-left:20px;padding-right:20px}
.band-title{font-size:26px;margin:0 0 24px;text-align:center;position:relative}
.band-title::after{content:"";display:block;width:54px;height:4px;border-radius:999px;margin:12px auto 0;
  background:linear-gradient(90deg,var(--primary),var(--accent))}
.cat-chips{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin:-6px 0 26px}
.cat-chips a{font-size:13.5px;color:var(--ink-soft);background:var(--surface);border:1px solid var(--line);
  padding:6px 14px;border-radius:999px;box-shadow:var(--shadow)}
.cat-chips a:hover{color:var(--primary-d);border-color:#bcd6ff;background:#f0f6ff;text-decoration:none}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:18px}
.prod-card,.art-card{position:relative;display:flex;flex-direction:column;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--radius);padding:22px 22px 20px;box-shadow:var(--shadow);
  transition:transform .18s,box-shadow .18s,border-color .18s;overflow:hidden}
.prod-card::before,.art-card::before{content:"";position:absolute;left:0;top:0;height:3px;width:100%;
  background:linear-gradient(90deg,var(--primary),var(--accent));opacity:0;transition:opacity .18s}
.prod-card:hover,.art-card:hover{transform:translateY(-5px);border-color:#cfe0ff;
  box-shadow:0 18px 44px rgba(15,30,60,.15);text-decoration:none}
.prod-card:hover::before,.art-card:hover::before{opacity:1}
.prod-cat,.art-cat{display:inline-block;font-size:12px;color:var(--primary-d);background:#eaf2ff;
  padding:3px 11px;border-radius:20px;margin-bottom:12px;align-self:flex-start}
.prod-card h3,.art-card h3{margin:0 0 8px;font-size:18px;color:var(--ink)}
.prod-card p,.art-card p{margin:0 0 16px;color:var(--ink-soft);font-size:14px;flex:1}
.card-more{font-size:13px;color:var(--primary);font-weight:600}
.svc-list{max-width:860px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:14px;list-style:none;padding:0}
.svc-list li{display:flex;gap:14px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);
  border-radius:12px;padding:18px 20px;box-shadow:var(--shadow)}
.svc-list b{display:block;font-size:15.5px;color:var(--ink);margin-bottom:4px}
.svc-list p{margin:0;font-size:13.5px;color:var(--ink-soft)}
.svc-ico{flex:0 0 auto;width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(120deg,var(--primary),var(--accent-d));color:#fff;font-size:18px}

/* ===== List / category ===== */
.list-layout{display:grid;grid-template-columns:240px minmax(0,1fr);gap:32px;align-items:start}
.cat-side{position:sticky;top:84px;background:var(--surface);border:1px solid var(--line);border-radius:12px;
  padding:16px;box-shadow:var(--shadow)}
.cat-side-title{font-size:14px;color:var(--ink-soft);margin:0 0 10px;letter-spacing:.05em}
.category-list{list-style:none;margin:0;padding:0}
.category-list li{margin:2px 0}
.category-list a{display:block;padding:8px 12px;border-radius:8px;color:var(--ink-soft);font-size:14px}
.category-list a:hover,.category-list li.active a{background:#eaf2ff;color:var(--primary-d);text-decoration:none;font-weight:600}
.cat-content .list-title{font-size:28px;margin:0 0 18px}
.item-list{list-style:none;margin:0;padding:0}
.item{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin-bottom:14px;box-shadow:var(--shadow)}
.item-title{font-size:18px;font-weight:600}
.item-sum{margin:8px 0 0;color:var(--ink-soft);font-size:14px}

/* ===== Card page ===== */
.card-page{max-width:var(--maxw);margin:30px auto;padding:0 20px}
.card-showcase{display:grid;grid-template-columns:320px minmax(0,1fr);gap:40px;align-items:center;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow)}
.card-frame{justify-self:center;background:linear-gradient(120deg,var(--dark),var(--dark-2));border-radius:16px;padding:14px;
  box-shadow:0 20px 50px rgba(11,18,32,.4)}
.card-image{display:block;border-radius:8px;width:300px;height:500px;object-fit:contain;background:#fff}
.card-info h1{font-size:30px;margin:0 0 12px}
.card-desc{color:var(--ink-soft)}
.card-tip,.card-note{font-size:14px;color:var(--ink-soft)}
.card-note{background:#f1f6ff;border-left:4px solid var(--primary);padding:10px 14px;border-radius:0 8px 8px 0}

/* ===== Capsule (bottom-right) ===== */
.capsule{position:fixed;right:16px;bottom:26px;z-index:60;display:flex;flex-direction:column;gap:10px}
.cap-btn{display:flex;flex-direction:column;align-items:center;gap:3px;width:62px;padding:11px 6px;border:none;cursor:pointer;
  background:linear-gradient(120deg,var(--primary),var(--accent-d));color:#fff;border-radius:14px;
  box-shadow:0 12px 26px rgba(15,30,60,.28);font-size:12px;transition:transform .16s,filter .16s}
.cap-btn:hover{filter:brightness(1.08);transform:translateY(-2px)}
.cap-ico{font-size:20px;line-height:1}
.cap-txt{font-size:12px}

/* ===== WeChat modal ===== */
.wx-modal{position:fixed;inset:0;z-index:80;display:flex;align-items:center;justify-content:center}
.wx-modal[hidden]{display:none}
.wx-mask{position:absolute;inset:0;background:rgba(8,14,26,.6);backdrop-filter:blur(2px)}
.wx-panel{position:relative;background:var(--surface);border-radius:18px;padding:22px;max-width:92vw;
  box-shadow:0 30px 80px rgba(0,0,0,.45);text-align:center}
.wx-close{position:absolute;right:12px;top:8px;border:none;background:none;font-size:26px;color:var(--ink-soft);cursor:pointer}
.wx-tip{font-size:14px;color:var(--ink-soft);margin:0 0 12px}
.wx-card{width:300px;height:500px;object-fit:contain;border-radius:10px;background:#fff;box-shadow:var(--shadow)}
.wx-note{font-size:13px;color:var(--ink-soft);margin:12px 0 0;max-width:300px}

/* ===== Footer ===== */
.site-footer{background:linear-gradient(100deg,var(--dark),var(--dark-2));color:#c6d4ea;margin-top:40px}
.ft-inner{max-width:var(--maxw);margin:0 auto;padding:40px 20px;display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:28px}
.ft-col h4{color:#fff;font-size:15px;margin:0 0 12px}
.ft-col p{font-size:14px;margin:0;color:#a9b8d2}
.ft-col ul{list-style:none;margin:0;padding:0}
.ft-col li{margin:6px 0}
.ft-col a{color:#bcd0ee;font-size:14px}
.ft-bottom{max-width:var(--maxw);margin:0 auto;padding:16px 20px;border-top:1px solid rgba(255,255,255,.08);
  display:flex;justify-content:space-between;font-size:13px;color:#8aa0c4;flex-wrap:wrap;gap:8px}

/* ===== Responsive ===== */
@media (max-width:960px){
  .doc-layout{grid-template-columns:1fr}
  .toc-aside{display:none}
  .list-layout{grid-template-columns:1fr}
  .cat-side{position:static}
  .card-showcase{grid-template-columns:1fr;text-align:center}
  .svc-list{grid-template-columns:1fr}
  .ft-inner{grid-template-columns:1fr 1fr}
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-visual{display:none}
  .hero-title{font-size:36px}
  .hero-title .hl{font-size:25px}
}
@media (max-width:680px){
  .top-nav{display:none}
  .drawer-toggle{display:block}
  .hero{padding:48px 0 46px}
  .hero-title{font-size:29px}
  .hero-title .hl{font-size:21px}
  .hero-stats{grid-template-columns:1fr 1fr;gap:12px}
  .doc-main{padding:22px 18px}
  .ft-inner{grid-template-columns:1fr}
  .cap-btn{width:52px}
}