:root{
    --bg:#060b18;
    --bg-2:#0a1226;
    --surface:#0e1830;
    --surface-2:#121e3d;
    --line:rgba(255,255,255,.08);
    --line-2:rgba(255,255,255,.14);
    --ink:#eaf0fb;
    --ink-2:#aab8d6;
    --ink-3:#6f7fa6;
    --blue:#3b82f6;
    --blue-2:#60a5fa;
    --blue-soft:rgba(59,130,246,.14);
    --bar:#2a3656;
    --accent:#34d399;
    --danger:#f87171;
    --radius:16px;
    --maxw:1200px;
    --grid:rgba(255,255,255,.02);
  }
  *{margin:0;padding:0;box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    background:var(--bg);color:var(--ink);
    font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",-apple-system,BlinkMacSystemFont,sans-serif;
    line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden;
  }
  a{color:inherit;text-decoration:none}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
  .eyebrow{font-size:13px;letter-spacing:.12em;color:var(--blue-2);font-weight:600;text-transform:uppercase}
  .mono{font-family:"SF Mono",ui-monospace,"JetBrains Mono",Menlo,Consolas,monospace}

  .mobile-toggle{display:none;width:42px;height:42px;align-items:center;justify-content:center;gap:4px;flex-direction:column;background:transparent;border:1px solid var(--line-2);border-radius:10px;color:var(--ink);cursor:pointer}
  .mobile-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:currentColor}

  /* nav (shared with D) */
  header{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:rgba(6,11,24,.72);border-bottom:1px solid var(--line)}
  .nav{display:flex;align-items:center;gap:36px;height:66px}
  .brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;letter-spacing:.02em}
  .brand img{width:26px;height:26px;border-radius:7px}
  .brand .tagm{font-size:10px;color:var(--ink-3);border:1px solid var(--line-2);padding:1px 6px;border-radius:5px;margin-left:2px}
  .navlinks{display:flex;gap:28px;font-size:14.5px;color:var(--ink-2)}
  .navlinks .has-sub{position:relative}
  .navlinks a:hover{color:var(--ink)}
  .navlinks a.cur{color:var(--ink)}
  .submenu{position:absolute;top:32px;left:-14px;background:var(--surface-2);border:1px solid var(--line-2);border-radius:12px;padding:8px;min-width:230px;opacity:0;visibility:hidden;transform:translateY(-6px);transition:.18s;box-shadow:0 18px 50px rgba(0,0,0,.5)}
  .has-sub:hover .submenu{opacity:1;visibility:visible;transform:translateY(0)}
  .submenu a{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:8px;font-size:14px;color:var(--ink-2)}
  .submenu a:hover{background:var(--blue-soft);color:var(--ink)}
  .submenu a.on{background:var(--blue-soft);color:var(--ink)}
  .submenu a .sv{font-size:11.5px;color:var(--ink-3)}
  .submenu .smtag{font-size:11px;color:var(--ink-3);padding:4px 12px}
  .nav-cta{margin-left:auto;display:flex;align-items:center;gap:14px}
  .btn{display:inline-flex;align-items:center;gap:8px;border-radius:10px;font-weight:600;font-size:14.5px;padding:10px 18px;cursor:pointer;border:1px solid transparent;transition:.18s;white-space:nowrap}
  .btn-ghost{color:var(--ink-2);border-color:var(--line-2)}
  .btn-ghost:hover{color:var(--ink);border-color:var(--ink-3)}
  .btn-primary{background:linear-gradient(180deg,#4f93ff,#2f6bdf);color:#fff;box-shadow:0 8px 24px rgba(47,107,223,.4)}
  .btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 30px rgba(47,107,223,.5)}
  .btn-lg{padding:14px 26px;font-size:15.5px}
  .link-arrow{color:var(--blue-2);font-weight:600;font-size:15px;display:inline-flex;gap:6px;align-items:center}
  .link-arrow:hover{gap:10px;transition:.15s}

  /* breadcrumb + hero */
  .shero{position:relative;padding:30px 0 40px}
  .shero::before{content:"";position:absolute;inset:-180px 0 auto 0;height:660px;background:
    radial-gradient(640px 400px at 28% 6%,rgba(59,130,246,.24),transparent 60%),
    radial-gradient(480px 340px at 88% 0,rgba(96,165,250,.12),transparent 60%);pointer-events:none}
  .shero .grid-bg{position:absolute;inset:0;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:46px 46px;mask-image:linear-gradient(180deg,#000 0%,transparent 86%);-webkit-mask-image:linear-gradient(180deg,#000 0%,transparent 86%);pointer-events:none}
  .crumb{position:relative;font-size:13px;color:var(--ink-3);margin-bottom:26px;display:flex;align-items:center;gap:8px}
  .crumb a:hover{color:var(--ink-2)}
  .crumb .sep{opacity:.5}
  .shero-grid{position:relative;display:grid;grid-template-columns:1fr 1.04fr;gap:48px;align-items:center}
  .pill{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;color:var(--ink-2);background:var(--surface);border:1px solid var(--line-2);padding:6px 14px;border-radius:999px;margin-bottom:22px}
  .pill .dot{width:7px;height:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px rgba(52,211,153,.18)}
  h1.shero-title{font-size:48px;line-height:1.1;font-weight:800;letter-spacing:-.02em;margin-bottom:18px}
  h1.shero-title .grad{background:linear-gradient(90deg,#9cc2ff,#3b82f6);-webkit-background-clip:text;background-clip:text;color:transparent}
  .shero-sub{font-size:17px;color:var(--ink-2);max-width:480px;margin-bottom:28px}
  .hero-actions{display:flex;gap:13px;flex-wrap:wrap}

  /* workspace window */
  .app{background:var(--surface);border:1px solid var(--line-2);border-radius:14px;overflow:hidden;box-shadow:0 40px 90px rgba(0,0,0,.6)}
  .app-bar{display:flex;align-items:center;gap:11px;padding:9px 14px;border-bottom:1px solid var(--line);background:var(--bg-2)}
  .app-bar .dots{display:flex;gap:6px}
  .app-bar .dots i{width:10px;height:10px;border-radius:50%;display:block;background:#2a3656}
  .app-bar .tab{font-size:12px;color:var(--ink-2);background:var(--surface);border:1px solid var(--line);padding:4px 11px;border-radius:6px}
  .app-bar .url{margin-left:auto;font-size:11px;color:var(--ink-3)}
  .app-body{padding:16px 16px 18px}
  .ws-prompt{display:flex;gap:10px;align-items:flex-start;margin-bottom:9px}
  .ava{width:28px;height:28px;border-radius:8px;flex:none;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700}
  .ava.u{background:#23335c;color:#bcd0ff}
  .ava.ai{background:linear-gradient(180deg,#4f93ff,#2f6bdf);color:#fff}
  .bub{font-size:13px;color:var(--ink);background:var(--surface-2);border:1px solid var(--line);padding:8px 12px;border-radius:10px}
  .ws-meta{display:flex;align-items:center;gap:7px;font-size:11px;color:var(--accent);margin:0 0 12px 38px;font-family:"SF Mono",ui-monospace,monospace}
  .ws-meta::before{content:"▸ "}
  .ws-res{margin-left:38px;animation:fade .4s ease}
  .ws-aireply{display:flex;gap:10px;align-items:flex-start;margin:0 0 12px -38px}
  .ws-aireply .txt{font-size:13px;color:var(--ink-2);padding-top:3px}
  @keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
  .kpis{display:flex;gap:14px;margin-bottom:14px;flex-wrap:wrap}
  .kpi{background:var(--bg-2);border:1px solid var(--line);border-radius:10px;padding:10px 14px;flex:1;min-width:84px}
  .kpi .n{font-size:19px;font-weight:800;color:var(--ink);letter-spacing:-.01em}
  .kpi .n.bad{color:var(--danger)}
  .kpi .l{font-size:11px;color:var(--ink-3)}
  .storebars{display:flex;gap:6px;align-items:flex-end;height:120px;background:var(--bg-2);border:1px solid var(--line);border-radius:10px;padding:14px 12px 10px}
  .storebars .col{flex:1;display:flex;flex-direction:column;align-items:center;gap:6px;height:100%}
  .storebars .col .bar{width:100%;border-radius:4px 4px 0 0;margin-top:auto;background:var(--bar)}
  .storebars .col.hl .bar{background:linear-gradient(180deg,#4f93ff,#2f6bdf)}
  .storebars .col.dn .bar{background:linear-gradient(180deg,#fb7185,#e0455a)}
  .storebars .col .nm{font-size:9.5px;color:var(--ink-3)}
  .storebars .col.dn .nm{color:var(--danger)}

  /* generic section */
  section.block{padding:84px 0;position:relative}
  section.block.alt{background:linear-gradient(180deg,var(--bg-2),var(--bg))}
  .sec-head{max-width:740px;margin-bottom:40px}
  .sec-head .eyebrow{display:block;margin-bottom:12px}
  .sec-head h2{font-size:34px;font-weight:800;letter-spacing:-.01em;line-height:1.18;margin-bottom:14px}
  .sec-head p{font-size:16.5px;color:var(--ink-2)}

  /* pain cards */
  .pain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  .pain{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:24px;position:relative;transition:.18s}
  .pain:hover{border-color:var(--line-2);background:var(--surface-2)}
  .pain .q{font-size:34px;line-height:1;color:var(--bar);font-weight:800;margin-bottom:14px}
  .pain h4{font-size:17px;font-weight:700;margin-bottom:9px}
  .pain p{font-size:14px;color:var(--ink-2)}

  /* do-list */
  .do-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
  .do{display:flex;gap:14px;background:var(--surface);border:1px solid var(--line);border-radius:13px;padding:18px 20px;transition:.18s}
  .do:hover{border-color:var(--blue);background:var(--surface-2)}
  .do .ic{width:38px;height:38px;border-radius:10px;background:var(--blue-soft);border:1px solid rgba(59,130,246,.28);display:flex;align-items:center;justify-content:center;flex:none}
  .do .ic svg{width:19px;height:19px;stroke:var(--blue-2)}
  .do h4{font-size:15.5px;font-weight:700;margin-bottom:5px}
  .do p{font-size:13.5px;color:var(--ink-2)}

  /* io columns */
  .io-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
  .io{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:26px}
  .io .iohd{display:flex;align-items:center;gap:10px;margin-bottom:18px}
  .io .iohd .tg{font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:4px 10px;border-radius:7px}
  .io.in .iohd .tg{background:rgba(148,163,184,.16);color:#cbd5e1}
  .io.out .iohd .tg{background:var(--blue-soft);color:var(--blue-2)}
  .io .iohd h4{font-size:17px;font-weight:700}
  .io ul{list-style:none;display:flex;flex-wrap:wrap;gap:9px}
  .io li{font-size:13.5px;color:var(--ink-2);background:var(--bg-2);border:1px solid var(--line);padding:8px 13px;border-radius:9px;display:flex;align-items:center;gap:8px}
  .io li svg{width:15px;height:15px;flex:none}
  .io.in li svg{stroke:var(--ink-3)}
  .io.out li svg{stroke:var(--blue-2)}

  /* workflow steps */
  .flow{display:grid;grid-template-columns:repeat(5,1fr);gap:0;position:relative}
  .flow::before{content:"";position:absolute;top:27px;left:9%;right:9%;height:2px;background:linear-gradient(90deg,transparent,var(--line-2) 10%,var(--line-2) 90%,transparent)}
  .fstep{position:relative;padding:0 14px;text-align:center}
  .fstep .num{width:54px;height:54px;border-radius:15px;margin:0 auto 16px;background:var(--surface);border:1px solid var(--line-2);display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:800;color:var(--blue-2);position:relative;z-index:2}
  .fstep h4{font-size:15px;font-weight:700;margin-bottom:7px}
  .fstep p{font-size:13px;color:var(--ink-2)}

  /* evidence */
  .ev-grid{display:grid;grid-template-columns:1.18fr 1fr;gap:18px;align-items:start}
  .panel{background:var(--surface);border:1px solid var(--line-2);border-radius:14px;overflow:hidden}
  .panel-hd{display:flex;align-items:center;gap:9px;padding:13px 18px;border-bottom:1px solid var(--line);background:var(--bg-2);font-size:13px;color:var(--ink-2);font-weight:600}
  .panel-hd .badge{margin-left:auto;font-size:11px;font-weight:600;padding:3px 9px;border-radius:999px}
  .panel-hd .badge.bad{background:rgba(248,113,113,.15);color:var(--danger)}
  .panel-hd .badge.good{background:rgba(52,211,153,.16);color:var(--accent)}
  .panel-bd{padding:18px}
  .diag-row{display:flex;gap:12px;margin-bottom:16px}
  .diag-k{background:var(--bg-2);border:1px solid var(--line);border-radius:10px;padding:11px 13px;flex:1}
  .diag-k .n{font-size:17px;font-weight:800}
  .diag-k .n.bad{color:var(--danger)}
  .diag-k .n.flat{color:var(--ink-2)}
  .diag-k .l{font-size:11px;color:var(--ink-3)}
  .why{background:var(--bg-2);border:1px solid var(--line);border-radius:10px;padding:13px 15px;margin-bottom:14px}
  .why .t{font-size:12px;color:var(--blue-2);font-weight:700;margin-bottom:7px;letter-spacing:.03em}
  .why p{font-size:13px;color:var(--ink-2);line-height:1.7}
  .acts{display:grid;gap:8px}
  .act{display:flex;gap:10px;align-items:flex-start;font-size:13px;color:var(--ink-2)}
  .act .dotnum{width:20px;height:20px;border-radius:6px;background:var(--blue-soft);color:var(--blue-2);font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center;flex:none;margin-top:1px}
  /* wechat push */
  .wx-grp{font-size:11.5px;color:var(--ink-3);margin-bottom:11px}
  .wx-msg{display:flex;gap:9px;align-items:flex-start}
  .wx-ava{width:30px;height:30px;border-radius:7px;background:#2aae67;color:#fff;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex:none}
  .wx-bub{background:var(--bg-2);border:1px solid var(--line);border-radius:3px 10px 10px 10px;padding:12px 14px;font-size:12.5px;color:var(--ink-2);line-height:1.75}
  .wx-bub b{color:var(--ink)}
  .todo-row{display:flex;align-items:center;gap:9px;padding:9px 0;border-bottom:1px solid var(--line);font-size:12.5px;color:var(--ink-2)}
  .todo-row:last-child{border-bottom:none}
  .todo-row .cb{width:14px;height:14px;border:1.5px solid var(--blue);border-radius:4px;flex:none}
  .todo-row .who{margin-left:auto;font-size:11px;color:var(--ink-3)}

  /* related features */
  .rf-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
  .rf{display:flex;gap:14px;align-items:flex-start;background:var(--surface);border:1px solid var(--line);border-radius:13px;padding:20px;transition:.18s}
  .rf:hover{border-color:var(--blue);background:var(--surface-2);transform:translateY(-3px)}
  .rf .ic{width:40px;height:40px;border-radius:11px;background:var(--blue-soft);border:1px solid rgba(59,130,246,.28);display:flex;align-items:center;justify-content:center;flex:none}
  .rf .ic svg{width:20px;height:20px;stroke:var(--blue-2)}
  .rf h4{font-size:15px;font-weight:700;margin-bottom:4px}
  .rf p{font-size:13px;color:var(--ink-2);margin-bottom:9px}
  .rf .go{font-size:12.5px;color:var(--blue-2);font-weight:600}

  /* cross-scenario chain */
  .chain{background:var(--surface);border:1px solid var(--line-2);border-radius:16px;padding:30px 26px}
  .chain-row{display:flex;align-items:stretch;gap:0;flex-wrap:wrap}
  .clink{flex:1;min-width:200px;background:var(--bg-2);border:1px solid var(--line);border-radius:12px;padding:18px}
  .clink .tag{font-size:11px;font-weight:700;color:var(--blue-2);letter-spacing:.04em;margin-bottom:8px;display:flex;align-items:center;gap:7px}
  .clink .tag .d{width:7px;height:7px;border-radius:50%;background:var(--blue)}
  .clink p{font-size:13.5px;color:var(--ink-2)}
  .clink a:hover .tag{text-decoration:underline}
  .carrow{display:flex;align-items:center;justify-content:center;padding:0 10px;color:var(--ink-3);font-size:20px;flex:none}

  /* enterprise transition band */
  .entband{background:linear-gradient(120deg,var(--surface-2),var(--surface));border:1px solid var(--line-2);border-radius:18px;padding:38px 36px;display:grid;grid-template-columns:1.3fr 1fr;gap:36px;align-items:center}
  .entband h3{font-size:23px;font-weight:800;line-height:1.3;margin-bottom:12px}
  .entband p{font-size:14.5px;color:var(--ink-2);margin-bottom:20px;max-width:440px}
  .ent-tags{display:flex;flex-wrap:wrap;gap:9px}
  .ent-tags span{font-size:12.5px;color:var(--ink-2);background:var(--bg-2);border:1px solid var(--line-2);padding:7px 13px;border-radius:999px}
  .entband .side{display:flex;flex-direction:column;gap:13px;align-items:flex-start}

  /* related scenarios */
  .rs-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
  .rs{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:22px;transition:.18s}
  .rs:hover{border-color:var(--blue);background:var(--surface-2);transform:translateY(-3px)}
  .rs .k{font-size:12px;color:var(--ink-3);margin-bottom:9px;letter-spacing:.04em}
  .rs h4{font-size:17px;font-weight:700;margin-bottom:8px}
  .rs p{font-size:13.5px;color:var(--ink-2);margin-bottom:14px}
  .rs .go{font-size:13px;color:var(--blue-2);font-weight:600}

  /* final cta */
  .final{position:relative;text-align:center;padding:96px 0}
  .final::before{content:"";position:absolute;inset:0;background:radial-gradient(700px 320px at 50% 0,rgba(59,130,246,.22),transparent 65%)}
  .final h2{position:relative;font-size:42px;font-weight:800;letter-spacing:-.01em;margin-bottom:18px}
  .final p{position:relative;color:var(--ink-2);font-size:18px;margin-bottom:32px}
  .final .hero-actions{position:relative;justify-content:center;display:flex;gap:13px;flex-wrap:wrap}

  /* footer (shared with D) */
  footer{border-top:1px solid var(--line);padding:56px 0 36px;background:var(--bg-2)}
  .foot-grid{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:30px;margin-bottom:38px}
  .foot-grid h5{font-size:13px;color:var(--ink-3);text-transform:uppercase;letter-spacing:.08em;margin-bottom:14px}
  .foot-grid a{display:block;font-size:14px;color:var(--ink-2);padding:5px 0}
  .foot-grid a:hover{color:var(--ink)}
  .foot-brand p{font-size:13.5px;color:var(--ink-3);margin-top:12px;max-width:240px}
  .foot-bot{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:12.5px;color:var(--ink-3)}


  @media(max-width:980px){
    h1.shero-title{font-size:38px}
    .shero-grid{grid-template-columns:1fr;gap:34px}
    .pain-grid,.rf-grid,.rs-grid{grid-template-columns:1fr}
    .do-grid,.io-grid,.ev-grid{grid-template-columns:1fr}
    .flow{grid-template-columns:1fr 1fr;gap:30px 0}
    .flow::before{display:none}
    .entband{grid-template-columns:1fr;gap:24px}
    .chain-row{flex-direction:column}
    .carrow{transform:rotate(90deg);padding:8px 0}
    .foot-grid{grid-template-columns:1fr 1fr}
    .nav{position:relative;gap:14px}
    .mobile-toggle{display:inline-flex;margin-left:auto}
    .nav-cta{margin-left:0}
    .nav.open .navlinks{display:flex;position:absolute;top:66px;left:0;right:0;flex-direction:column;gap:6px;padding:12px;background:var(--surface-2);border:1px solid var(--line-2);border-radius:12px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
    .nav.open .navlinks a,.nav.open .navlinks .has-sub>a{display:block;padding:10px 12px;border-radius:8px}
    .nav.open .has-sub .submenu{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;background:transparent;border:0;padding:0 0 0 10px;min-width:0}

    .navlinks{display:none}
  }
  @media(max-width:600px){
    .brand .tagm{display:none}
    .nav-cta .btn-ghost{display:none}
    .nav-cta .btn{padding:9px 12px;font-size:13px}

    h1.shero-title{font-size:30px}
    .final h2{font-size:28px}
    .kpis{gap:8px}
  }