:root{
    --bg:#070708; --surface:#0A0A0A; --elevated:#101010; --line:#1A1A1F;
    --accent:#0070F3; --text:#FFFFFF; --sec:#A1A1AA; --ter:#6B7280; --green:#10B981;
    --strong:#D4D4D8; --header-bg:rgba(7,7,8,.82); --btn-border:rgba(255,255,255,.16);
    --cta-from:#070708; --cta-to:#031128;
  }
  body.light{
    --bg:#FFFFFF; --surface:#FAFAFA; --elevated:#F4F4F5; --line:#E4E4E7;
    --text:#18181B; --sec:#52525B; --ter:#A1A1AA;
    --strong:#27272A; --header-bg:rgba(255,255,255,.85); --btn-border:rgba(0,0,0,.12);
    --cta-from:#FFFFFF; --cta-to:#EAF2FE;
  }
  body.light svg [fill="#1A1A1F"]{fill:#E4E4E7}
  body.light svg [stroke="#1A1A1F"]{stroke:#E4E4E7}
  body.light svg [stroke="#A1A1AA"]{stroke:#71717A}
  body.light .client-card:hover{border-color:rgba(0,112,243,.5)}
  body.light .tab-card:hover{border-color:var(--strong)}
  body.light .faq-item:hover{border-color:var(--strong)}
  *{margin:0;padding:0;box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{background:var(--bg);color:var(--text);font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased;transition:background .3s,color .3s}
  a{color:inherit;text-decoration:none;cursor:pointer}
  button{font-family:inherit;cursor:pointer;border:none}
  .wrap{max-width:1440px;margin:0 auto}

  /* ===== Header ===== */
  header{position:sticky;top:0;z-index:100;background:var(--header-bg);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
  .header-in{height:68px;padding:0 80px;display:flex;align-items:center;justify-content:space-between;max-width:1440px;margin:0 auto;position:relative}
  .h-left{display:flex;align-items:center;gap:48px}
  .logo{display:flex;align-items:center;gap:10px;cursor:pointer}
  .logo-mark svg{display:block}
  .logo-name{font-size:20px;font-weight:700;line-height:1}
  .trust-line{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ter)}
  .trust-line svg{flex-shrink:0}
  .logo-mark{width:34px;height:34px;display:flex;align-items:center;justify-content:center}
  .logo-mark svg{width:100%;height:100%}
  .logo-mark .lc{stroke:#FFFFFF}
  .logo-mark .lt{stroke:#FFFFFF}
  .logo-mark .ld{fill:#FFFFFF}
  body.light .logo-mark .lc{stroke:#0070F3}
  body.light .logo-mark .lt{stroke:#5CB8FF}
  body.light .logo-mark .ld{fill:#5CB8FF}
  .logo-name{font-size:20px;font-weight:700}
  nav{position:absolute;left:50%;transform:translateX(-50%);display:flex;gap:32px;align-items:center}
  .nav-drop{position:relative;display:flex;align-items:center}
  .nav-drop>a{cursor:pointer;display:flex;align-items:center;gap:4px}
  .nav-drop .chev{transition:transform .2s}
  .nav-drop:hover .chev{transform:rotate(180deg)}
  .drop-menu{display:none;position:absolute;top:calc(100% + 10px);left:50%;transform:translateX(-50%);background:var(--elevated);border:1px solid var(--line);border-radius:12px;padding:8px;min-width:150px;flex-direction:column;gap:2px;box-shadow:0 12px 32px rgba(0,0,0,.35);z-index:200}
  .drop-menu::before{content:'';position:absolute;top:-12px;left:0;right:0;height:12px}
  .nav-drop:hover .drop-menu{display:flex}
  .drop-menu a{padding:10px 16px;border-radius:8px;font-size:14px;color:var(--sec);white-space:nowrap}
  .drop-menu a:hover{background:var(--surface);color:var(--text)}
  .nav-drop.active>a{color:var(--text);font-weight:500}
  nav a{font-size:15px;color:var(--sec);transition:color .2s}
  nav a:hover{color:var(--text)}
  nav a.active{color:var(--text);font-weight:500}
  .h-right{display:flex;align-items:center;gap:24px}
  .theme-btn{width:36px;height:36px;border-radius:10px;background:transparent;border:1px solid var(--btn-border);color:var(--sec);display:flex;align-items:center;justify-content:center;transition:all .2s}
  .theme-btn:hover{color:var(--text);border-color:var(--strong)}
  .menu-btn{display:none;width:36px;height:36px;border-radius:10px;background:transparent;border:1px solid var(--btn-border);color:var(--sec);align-items:center;justify-content:center}
  .mobile-menu{display:none;flex-direction:column;border-bottom:1px solid var(--line);background:var(--bg);padding:12px 20px 20px;gap:4px}
  .mobile-menu.open{display:flex}
  .mobile-menu a{padding:12px 8px;font-size:15px;color:var(--sec);border-radius:8px}
  .mobile-menu a:active{background:var(--elevated);color:var(--text)}
  .mobile-menu .m-actions{display:flex;gap:12px;padding-top:12px;margin-top:8px;border-top:1px solid var(--line)}
  .mobile-menu .m-actions .btn-accent{flex:1;text-align:center;padding:11px}
  .m-parent{display:flex;justify-content:space-between;align-items:center}
  .m-parent .chev{transition:transform .2s}
  .m-parent.open .chev{transform:rotate(180deg)}
  .m-sub{display:none;flex-direction:column;margin:2px 0 4px 8px;padding-left:16px;border-left:1px solid var(--line)}
  .m-sub.open{display:flex}
  .m-sub a{font-size:14px}
  .login{color:var(--sec);font-size:15px;cursor:pointer}
  .login:hover{color:var(--text)}
  .btn-accent{background:var(--accent);color:#fff;font-size:15px;font-weight:500;padding:9px 20px;border-radius:8px;transition:background .2s,transform .15s}
  .btn-accent:hover{background:#1a7ff5;transform:translateY(-1px)}

  /* ===== Hero ===== */
  .hero{padding:96px 120px 88px;display:flex;flex-direction:column;align-items:center;gap:32px;text-align:center}
  .badge{display:flex;align-items:center;gap:8px;padding:7px 16px;border-radius:999px;background:var(--surface);border:1px solid var(--line);font-size:13px;color:var(--sec);font-weight:500}
  .badge .dot{width:6px;height:6px;border-radius:3px;background:var(--accent);animation:pulse 2s infinite}
  @keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
  h1{font-size:56px;font-weight:900;letter-spacing:-1px;line-height:1.15}
  .caret{display:inline-block;width:3px;height:.95em;background:var(--accent);vertical-align:-.1em;margin-left:4px;border-radius:2px;animation:blink 1.1s steps(1) infinite}
  @keyframes blink{50%{opacity:0}}
  .hero-sub{font-size:18px;color:var(--sec)}
  .searchbar{width:720px;max-width:100%;height:64px;padding:0 8px 0 24px;border-radius:32px;background:var(--elevated);border:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;transition:border-color .2s, box-shadow .2s}
  .searchbar:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,112,243,.18)}
  .search-left{display:flex;align-items:center;gap:12px;flex:1}
  .search-left input{flex:1;background:transparent;border:none;outline:none;color:var(--text);font-size:16px;font-family:inherit}
  .search-left input::placeholder{color:var(--ter)}
  .btn-query{background:var(--accent);color:#fff;font-size:16px;font-weight:600;padding:12px 32px;border-radius:24px;transition:background .2s;min-width:96px}
  .btn-query:hover{background:#1a7ff5}
  .btn-query:disabled{opacity:.7;cursor:wait}

  /* ===== Demo result ===== */
  .demo{width:960px;max-width:100%;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:32px;text-align:left}
  .demo-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px}
  .demo-kw{display:flex;align-items:center;gap:12px}
  .demo-kw b{font-size:20px;font-weight:600}
  .demo-tag{background:var(--elevated);border-radius:6px;padding:4px 10px;font-size:12px;color:var(--sec);font-weight:500}
  .demo-time{font-size:13px;color:var(--ter)}
  .demo-body{display:flex;gap:40px}
  .demo-left{width:300px;flex-shrink:0}
  .metric-label{font-size:13px;color:var(--sec);font-weight:500}
  .metric-row{display:flex;align-items:baseline;gap:12px;margin:8px 0 12px}
  .metric-num{font-size:44px;font-weight:900}
  .metric-trend{font-size:14px;font-weight:600;color:var(--green)}
  #trendChart{width:300px;height:80px;display:block}
  .demo-right{flex:1}
  .bar-title{font-size:13px;color:var(--sec);font-weight:500;margin-bottom:16px}
  .bar-row{display:flex;align-items:center;gap:12px;margin-bottom:16px}
  .bar-row .name{width:76px;font-size:13px;color:var(--strong)}
  .bar-track{flex:1;height:8px;border-radius:4px;background:var(--line);overflow:hidden}
  .bar-fill{height:100%;border-radius:4px;background:var(--accent);width:0;transition:width .8s cubic-bezier(.22,1,.36,1)}
  .bar-row .val{font-size:13px;font-weight:600;width:28px;text-align:right}
  .demo-caption{font-size:13px;color:var(--ter)}
  .loading{display:inline-block;width:14px;height:14px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;vertical-align:-2px;margin-right:8px}
  @keyframes spin{to{transform:rotate(360deg)}}

  /* ===== Sections common ===== */
  section{padding:100px 120px}
  .sec-head{display:flex;flex-direction:column;align-items:center;gap:16px;text-align:center;margin-bottom:56px}
  .chip{font-size:12px;font-weight:600;color:var(--accent);letter-spacing:3px}
  h2{font-size:40px;font-weight:700}
  .sec-sub{font-size:16px;color:var(--sec)}
  .bg-surface{background:var(--surface)}

  /* ===== Feature tabs ===== */
  .feat-body{display:flex;gap:40px}
  .tab-list{width:420px;flex-shrink:0;display:flex;flex-direction:column;gap:16px}
  .tab-card{padding:24px;border-radius:12px;border:1px solid var(--line);cursor:pointer;transition:all .2s;background:transparent}
  .tab-card:hover{border-color:#2A2A30}
  .tab-card.active{background:var(--elevated);border-color:var(--accent)}
  .tab-title{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:600;color:var(--strong)}
  .tab-card.active .tab-title{color:var(--text)}
  .tab-desc{font-size:14px;color:var(--ter);line-height:22px;margin:10px 0}
  .tab-card.active .tab-desc{color:var(--sec)}
  .tab-tags{display:flex;gap:8px;font-size:12px;font-weight:500;color:var(--ter)}
  .tab-card.active .tab-tags{color:var(--accent)}
  .tab-preview{flex:1;background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:32px}
  .pv-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}
  .pv-head b{font-size:16px;font-weight:600}
  .pv-live{background:rgba(0,112,243,.15);color:var(--accent);font-size:12px;font-weight:600;padding:4px 10px;border-radius:6px}
  .pv-metrics{display:flex;gap:16px;margin-bottom:24px}
  .pv-metric{flex:1;background:var(--elevated);border-radius:12px;padding:20px}
  .pv-metric .l{font-size:12px;color:var(--sec)}
  .pv-metric .v{font-size:28px;font-weight:700;margin-top:6px}
  .pv-metric .v.green{color:var(--green)}
  .pv-pane{display:none;animation:fadeIn .35s ease}
  .pv-pane.show{display:block}
  @keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
  .rank-row{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:10px;margin-bottom:10px;background:var(--elevated)}
  .rank-row .rk{width:26px;height:26px;border-radius:7px;background:var(--line);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:var(--sec)}
  .rank-row.you{background:rgba(0,112,243,.12);border:1px solid rgba(0,112,243,.4)}
  .rank-row.you .rk{background:var(--accent);color:#fff}
  .rank-row .nm{flex:1;font-size:14px}
  .rank-row .pct{font-size:14px;font-weight:600;color:var(--sec)}
  .cmp-bars{display:flex;gap:40px;align-items:flex-end;height:170px;margin-top:8px}
  .cmp-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:10px}
  .cmp-col .cb{width:100%;border-radius:8px 8px 0 0;transition:height .8s cubic-bezier(.22,1,.36,1)}
  .cmp-col .cl{font-size:13px;color:var(--sec)}
  .cmp-col .cv{font-size:20px;font-weight:700}

  /* ===== Clients grid ===== */
  .client-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;max-width:1200px;margin:0 auto}
  .client-card{display:flex;align-items:center;gap:14px;padding:20px 24px;background:var(--surface);border:1px solid var(--line);border-radius:12px;transition:border-color .2s,transform .2s}
  .client-card:hover{border-color:rgba(0,112,243,.5);transform:translateY(-2px)}
  .client-card .nm{font-size:15px;font-weight:500}
  .client-card .st{display:flex;align-items:center;flex-wrap:wrap;gap:4px 8px;font-size:12px;color:var(--green);margin-top:5px}
  .plat-tag{display:flex;align-items:center;gap:4px;font-size:11px;color:var(--sec)}
  .plat-dot{width:6px;height:6px;border-radius:3px;background:var(--green);animation:breath 2.2s ease-in-out infinite}
  .plat-dot.d2{animation-delay:1.1s}
  @keyframes breath{0%,100%{opacity:1;box-shadow:0 0 6px rgba(16,185,129,.9)}50%{opacity:.25;box-shadow:0 0 0 rgba(16,185,129,0)}}
  img.clogo{width:40px;height:40px;border-radius:10px;object-fit:contain;background:#fff;padding:4px}

  /* ===== Testimonials ===== */
  .testi-rows{display:flex;flex-direction:column;gap:24px}
  .testi-wrap{overflow:hidden;position:relative;margin:0 -120px;-webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
  .testi-track{display:flex;width:max-content;animation:marquee 46s linear infinite}
  .testi-track.rev{animation-direction:reverse}
  .testi-wrap:hover .testi-track{animation-play-state:paused}
  @keyframes marquee{to{transform:translateX(-50%)}}
  .testi-card{flex-shrink:0;width:384px;margin-right:24px;background:var(--elevated);border:1px solid var(--line);border-radius:16px;padding:28px;display:flex;flex-direction:column;gap:24px;transition:border-color .2s}
  .testi-card:hover{border-color:#26262C}
  .testi-q{font-size:15px;color:var(--strong);line-height:25px}
  .testi-u{display:flex;align-items:center;gap:12px}
  img.avatar{width:44px;height:44px;border-radius:22px;object-fit:cover}
  .testi-u .n{font-size:14px;font-weight:600}
  .testi-u .r{font-size:12px;color:var(--ter);margin-top:4px}

  /* ===== CTA ===== */
  .cta{padding:120px;display:flex;flex-direction:column;align-items:center;gap:28px;text-align:center;background:linear-gradient(180deg,var(--cta-from),var(--cta-to))}
  .cta-btns{display:flex;gap:16px}
  .btn-primary{background:var(--accent);color:#fff;font-size:16px;font-weight:600;padding:14px 36px;border-radius:10px;transition:background .2s,transform .15s}
  .btn-primary:hover{background:#1a7ff5;transform:translateY(-1px)}
  .btn-ghost{background:transparent;color:var(--strong);font-size:16px;font-weight:500;padding:14px 36px;border-radius:10px;border:1px solid var(--btn-border);transition:border-color .2s}
  .btn-ghost:hover{border-color:var(--strong)}
  .cta-note{font-size:13px;color:var(--ter)}

  /* ===== Footer ===== */
  footer{border-top:1px solid var(--line);padding:64px 80px 40px}
  .f-top{display:flex;justify-content:space-between;max-width:1280px;margin:0 auto 48px}
  .f-brand{width:320px}
  .f-brand .slogan{font-size:14px;color:var(--ter);margin-top:16px}
  .qr-row{display:flex;gap:20px;margin-top:24px}
  .qr-item{display:flex;flex-direction:column;align-items:center;gap:8px}
  .qr-item svg{border-radius:8px;border:1px solid var(--line)}
  .qr-item span{font-size:12px;color:var(--ter)}
  .f-links{display:flex;gap:96px}
  .f-col{display:flex;flex-direction:column;gap:16px}
  .f-col b{font-size:14px;font-weight:600}
  .f-col a{font-size:14px;color:var(--sec);transition:color .2s}
  .f-col a:hover{color:var(--text)}
  .f-bottom{border-top:1px solid var(--line);padding-top:32px;display:flex;justify-content:space-between;max-width:1280px;margin:0 auto;font-size:13px;color:var(--ter)}
  .f-bottom .links{display:flex;gap:24px}

  /* ===== Pricing ===== */
  .p-hero{padding:96px 120px 64px;display:flex;flex-direction:column;align-items:center;gap:24px;text-align:center}
  .p-hero h1{font-size:44px;font-weight:700}
  .toggle{display:flex;gap:4px;padding:4px;border-radius:999px;background:var(--elevated);border:1px solid var(--line)}
  .toggle button{padding:8px 20px;border-radius:999px;background:transparent;color:var(--sec);font-size:14px;transition:all .2s}
  .toggle button.on{background:var(--accent);color:#fff;font-weight:500}
  .plans{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;padding:0 120px 100px;align-items:start}
  .plan{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:28px;display:flex;flex-direction:column;gap:20px;transition:transform .2s}
  .plan:hover{transform:translateY(-3px)}
  .plan.pro{border:1.5px solid var(--accent);box-shadow:0 8px 32px -8px rgba(0,112,243,.25)}
  .plan .pro-badge{align-self:flex-start;background:var(--accent);color:#fff;font-size:12px;font-weight:600;padding:5px 12px;border-radius:999px}
  .plan .pn{font-size:18px;font-weight:600}
  .plan .pd{font-size:13px;color:var(--ter)}
  .plan .price{display:flex;align-items:baseline;gap:4px}
  .plan .price b{font-size:36px;font-weight:900}
  .plan .price span{font-size:14px;color:var(--ter)}
  .plan .btn{width:100%;padding:11px;border-radius:8px;font-size:14px;font-weight:500;background:transparent;border:1px solid var(--btn-border);color:var(--strong);transition:all .2s}
  .plan .btn:hover{border-color:var(--strong)}
  .plan.pro .btn{background:var(--accent);border-color:var(--accent);color:#fff}
  .plan.pro .btn:hover{background:#1a7ff5}
  .plan hr{border:none;border-top:1px solid var(--line)}
  .plan .feat{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--strong);padding:4px 0}
  /* ===== Compare table ===== */
  .cmp-sec{padding:0 120px 100px}
  .cmp-sec h2{font-size:28px;text-align:center;margin-bottom:40px}
  table{width:100%;border-collapse:separate;border-spacing:0;background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;font-size:14px}
  th,td{padding:16px 24px;text-align:left;border-bottom:1px solid var(--line)}
  tr:last-child td{border-bottom:none}
  thead th{background:var(--elevated);color:var(--sec);font-weight:500}
  thead th.pro{color:var(--accent);font-weight:600}
  td:first-child{color:var(--strong);font-weight:500;width:200px}
  td{color:var(--sec)}
  td.pro{color:var(--text);font-weight:500}
  /* ===== FAQ ===== */
  .faq{padding:0 120px 100px;max-width:1080px;margin:0 auto}
  .faq h2{font-size:28px;text-align:center;margin-bottom:40px}
  .faq-item{background:var(--surface);border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden;cursor:pointer;transition:border-color .2s}
  .faq-item:hover{border-color:#2A2A30}
  .faq-q{display:flex;justify-content:space-between;align-items:center;padding:24px;font-size:15px;font-weight:600}
  .faq-q .arrow{transition:transform .25s;color:var(--ter);font-size:12px}
  .faq-item.open .arrow{transform:rotate(180deg)}
  .faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;font-size:14px;color:var(--sec);line-height:22px}
  .faq-item.open .faq-a{max-height:120px}
  .faq-a p{padding:0 24px 24px}

  /* ===== 子页面通用 ===== */
  .code-block{background:#0D1117;border:1px solid var(--line);border-radius:16px;padding:28px;font-family:Consolas,Menlo,monospace;font-size:14px;line-height:1.8;color:#C9D1D9;overflow-x:auto;text-align:left;max-width:840px;margin:0 auto;width:100%}
  .code-block .cm{color:#8B949E}
  .code-block .kw{color:#7EE787}
  .code-block .str{color:#A5D6FF}
  .diag-item{display:flex;gap:12px;align-items:flex-start;padding:16px;background:var(--elevated);border-radius:10px;margin-top:12px;font-size:14px;color:var(--strong);line-height:1.7}
  .diag-tag{flex-shrink:0;font-size:12px;font-weight:600;padding:3px 10px;border-radius:6px;margin-top:2px}
  .diag-tag.high{background:rgba(255,77,79,.15);color:#FF4D4F}
  .diag-tag.mid{background:rgba(245,166,35,.15);color:#F5A623}
  .diag-tag.low{background:rgba(16,185,129,.15);color:var(--green)}
  .timeline{max-width:840px;margin:0 auto}
  .tl-item{display:flex;gap:20px;position:relative;padding-bottom:36px}
  .tl-item:last-child{padding-bottom:0}
  .tl-item::before{content:'';position:absolute;left:9px;top:22px;bottom:2px;width:2px;background:var(--line)}
  .tl-item:last-child::before{display:none}
  .tl-dot{flex-shrink:0;width:20px;height:20px;border-radius:10px;border:2px solid var(--accent);background:var(--bg);margin-top:2px}
  .tl-item b{font-size:15px;font-weight:600;display:block;margin-bottom:6px}
  .tl-item p{font-size:14px;color:var(--sec);line-height:1.7}
  .stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;max-width:1200px;margin:0 auto}
  .contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:960px;margin:0 auto}
  .contact-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:28px;text-align:center}
  .contact-card .t{font-size:13px;color:var(--ter);margin-bottom:10px}
  .contact-card .v{font-size:16px;font-weight:600}
  img.cqr{width:72px;height:72px;border-radius:8px;border:1px solid var(--line);display:block;margin:14px auto 0}
  .about-text{max-width:760px;margin:0 auto;font-size:16px;color:var(--sec);line-height:2;text-align:center}

  /* ===== 文档页（隐私/条款） ===== */
  .doc-page{max-width:840px;margin:0 auto}
  .doc-page .doc-meta{font-size:13px;color:var(--ter);margin-top:12px}
  .doc-page h3{margin:40px 0 14px;font-size:20px;font-weight:600}
  .doc-page h4{margin:24px 0 10px;font-size:16px;font-weight:600;color:var(--strong)}
  .doc-page p{color:var(--sec);line-height:2;font-size:15px;margin-bottom:12px}
  .doc-page ul{color:var(--sec);line-height:2;font-size:15px;padding-left:22px;margin-bottom:12px}
  /* ===== 帮助中心 ===== */
  .help-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:1080px;margin:0 auto 56px}
  .help-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:28px;transition:border-color .2s,transform .2s;cursor:pointer}
  .help-card:hover{border-color:rgba(0,112,243,.5);transform:translateY(-2px)}
  .help-card .t{font-size:16px;font-weight:600;margin:14px 0 8px}
  .help-card .d{font-size:13px;color:var(--ter);line-height:1.8}
  /* ===== 更新日志 ===== */
  .ver-tag{flex-shrink:0;font-size:12px;font-weight:600;color:var(--accent);background:rgba(0,112,243,.12);padding:3px 10px;border-radius:6px}
  .ver-date{font-size:13px;color:var(--ter);margin-left:10px}
  @media(max-width:1100px){.help-grid{grid-template-columns:1fr 1fr}}
  @media(max-width:640px){.help-grid{grid-template-columns:1fr}}

  /* ===== 注册/登录 ===== */
  .auth-wrap{min-height:62vh;display:flex;align-items:center;justify-content:center;padding:64px 20px}
  .auth-card{width:420px;max-width:100%;background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:40px;text-align:center}
  .auth-card h2{font-size:26px;margin:18px 0 8px}
  .auth-card .sub{font-size:14px;color:var(--ter);margin-bottom:28px}
  .field{margin-bottom:16px;text-align:left}
  .field label{display:block;font-size:13px;color:var(--sec);margin-bottom:8px}
  .field input{width:100%;height:46px;padding:0 14px;border-radius:10px;background:var(--elevated);border:1px solid var(--line);color:var(--text);font-size:14px;font-family:inherit;outline:none;transition:border-color .2s}
  .field input:focus{border-color:var(--accent)}
  .auth-btn{width:100%;height:46px;border-radius:10px;background:var(--accent);color:#fff;font-size:15px;font-weight:600;margin-top:8px;transition:background .2s}
  .auth-btn:hover{background:#1a7ff5}
  .auth-alt{margin-top:20px;font-size:13px;color:var(--ter)}
  .auth-alt a{color:var(--accent);cursor:pointer}
  /* ===== 控制台 ===== */
  .console{display:flex;gap:32px;max-width:1280px;margin:0 auto;padding:40px 32px;min-height:60vh}
  .cs-side{width:220px;flex-shrink:0;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px;display:flex;flex-direction:column;gap:4px;height:max-content}
  .cs-item{display:flex;align-items:center;gap:10px;padding:11px 14px;border-radius:10px;font-size:14px;color:var(--sec);cursor:pointer;transition:all .2s}
  .cs-item:hover{color:var(--text);background:var(--elevated)}
  .cs-item.on{background:rgba(0,112,243,.12);color:var(--accent);font-weight:500}
  .cs-user{margin-top:auto;padding-top:16px;border-top:1px solid var(--line);display:flex;align-items:center;gap:10px}
  .cs-user .n{font-size:14px;font-weight:600}
  .cs-user .r{font-size:12px;color:var(--ter)}
  .cs-main{flex:1;min-width:0}
  .cs-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px;flex-wrap:wrap;gap:12px}
  .cs-head h2{font-size:26px}
  .cs-head p{font-size:13px;color:var(--ter);margin-top:6px}
  .cs-actions{display:flex;gap:10px}
  /* ===== 控制台业务页 ===== */
  .cv{display:none}
  .cv.show{display:block;animation:fadeIn .3s ease}
  .lk{color:var(--accent);font-size:13px;cursor:pointer;margin-right:14px}
  .lk:last-child{margin-right:0}
  .opt-chips{display:flex;flex-wrap:wrap;gap:10px}
  .opt-chip{padding:9px 18px;border-radius:999px;background:var(--elevated);border:1px solid var(--line);font-size:13px;color:var(--sec);cursor:pointer;transition:all .2s}
  .opt-chip:hover{border-color:var(--strong)}
  .opt-chip.on{background:rgba(0,112,243,.12);border-color:var(--accent);color:var(--accent);font-weight:500}
  .status-on{display:inline-block;font-size:12px;font-weight:500;color:var(--green);background:rgba(16,185,129,.12);padding:3px 10px;border-radius:6px}
  /* ===== 控制台门户模式 ===== */
  body.console-mode>header{display:none}
  body.console-mode>footer{display:none}
  .cs-topbar{position:sticky;top:0;z-index:60;display:flex;justify-content:space-between;align-items:center;padding:12px 32px;background:var(--bg);border-bottom:1px solid var(--line)}
  .cs-badge{font-size:12px;font-weight:600;color:var(--accent);background:rgba(0,112,243,.12);padding:3px 10px;border-radius:6px;margin-left:6px}
  .cs-top-right{display:flex;align-items:center;gap:18px;font-size:13px;color:var(--sec)}
  .cs-top-right a:hover{color:var(--text)}
  .fin-balance{background:linear-gradient(135deg,#0070F3,#5CB8FF);border-radius:16px;padding:32px;color:#fff;max-width:460px}
  .fin-balance .l{font-size:13px;opacity:.85}
  .fin-balance .v{font-size:40px;font-weight:900;margin:8px 0 20px}
  .fin-balance .btns{display:flex;gap:12px}
  .fin-balance .b1{background:#fff;color:#0070F3;border:none;padding:10px 24px;border-radius:8px;font-size:14px;font-weight:600}
  .fin-balance .b2{background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.35);padding:10px 24px;border-radius:8px;font-size:14px;font-weight:500}
  .fin-balance .b1:hover,.fin-balance .b2:hover{transform:translateY(-1px)}
  .amt-pos{color:var(--green);font-weight:600}
  .amt-neg{color:#FF4D4F;font-weight:600}
  /* ===== 控制台分组/子菜单/头像菜单/订阅弹窗 ===== */
  .cs-group{font-size:12px;color:var(--ter);padding:16px 14px 6px;letter-spacing:1px}
  .cs-parent{justify-content:flex-start}
  .cs-parent .chev{margin-left:auto;transition:transform .2s}
  .cs-parent.open .chev{transform:rotate(180deg)}
  .cs-sub{display:none;flex-direction:column;margin:2px 0 4px 10px;padding-left:12px;border-left:1px solid var(--line)}
  .cs-sub.open{display:flex}
  .cs-sub .cs-item{font-size:13px;padding:9px 12px}
  .cs-user-wrap{position:relative}
  .cs-menu{display:none;position:absolute;right:0;top:44px;background:var(--elevated);border:1px solid var(--line);border-radius:12px;padding:8px;min-width:190px;flex-direction:column;gap:2px;box-shadow:0 12px 32px rgba(0,0,0,.35);z-index:400}
  .cs-menu.show{display:flex}
  .cs-menu a{padding:10px 14px;border-radius:8px;font-size:14px;color:var(--sec);cursor:pointer}
  .cs-menu a:hover{background:var(--surface);color:var(--text)}
  .cs-menu a.danger{color:#FF4D4F}
  .auth-guest{display:flex;align-items:center;gap:24px}
  .auth-user{display:none;align-items:center;gap:10px;cursor:pointer;font-size:14px;font-weight:500}
  .auth-user:hover{color:var(--accent)}
  .modal-mask{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:400;align-items:center;justify-content:center;padding:20px}
  .modal-mask.show{display:flex}
  .modal{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:32px;width:760px;max-width:100%;max-height:90vh;overflow-y:auto}
  .modal-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}
  .modal-head b{font-size:20px}
  .modal-close{cursor:pointer;color:var(--ter);font-size:20px;line-height:1;padding:4px}
  .modal-body{display:flex;gap:32px;justify-content:space-between;align-items:flex-start}
  .sub-plan-info{flex:1;min-width:0}
  .sub-plan-info .p-price{font-size:32px;font-weight:900;margin:4px 0 14px}
  .sub-plan-info .p-feat{font-size:14px;color:var(--sec);line-height:2.1}
  .sub-pay{flex-shrink:0;text-align:center}
  .sub-pay .amt{font-size:15px;font-weight:600;margin-top:10px}
  .sub-pay .tip{font-size:12px;color:var(--ter);margin-top:4px}
  @media(max-width:1100px){.cs-topbar{padding:12px 20px}.cs-group{display:none}.cs-sub{border-left:none;margin:0;padding-left:0}.modal-body{flex-direction:column}}
  @media(max-width:1100px){
    .console{flex-direction:column;padding:0 20px 32px;gap:0}
    .cs-side{position:sticky;top:61px;z-index:50;width:auto;margin:0 -20px 24px;flex-direction:row;overflow-x:auto;padding:10px 20px;border-radius:0;border-left:none;border-right:none;background:var(--bg);-webkit-overflow-scrolling:touch}
    .cs-side::-webkit-scrollbar{display:none}
    .cs-item{white-space:nowrap;padding:9px 14px;flex-shrink:0}
    .cs-user{display:none}
    .cs-parent{display:none}
    .cs-sub{display:flex;flex-direction:row;border-left:none;margin:0;padding:0}
    .cs-sub .cs-item{font-size:14px;padding:9px 14px}
  }

  /* ===== 悬浮客服 ===== */
  .float-bar{position:fixed;right:24px;bottom:24px;z-index:300;display:flex;flex-direction:column;background:var(--elevated);border:1px solid var(--line);border-radius:14px;padding:8px 6px;box-shadow:0 8px 32px rgba(0,0,0,.3)}
  .fb-item{position:relative;width:46px;height:46px;display:flex;align-items:center;justify-content:center;border-radius:10px;color:var(--sec);cursor:pointer;transition:all .2s}
  .fb-item:hover{background:rgba(0,112,243,.12);color:var(--accent)}
  .fb-item:not(:last-child){margin-bottom:2px}
  .fb-panel{position:absolute;right:58px;top:50%;transform:translateY(-50%) translateX(6px);background:var(--elevated);border:1px solid var(--line);border-radius:12px;padding:14px 18px;display:none;white-space:nowrap;box-shadow:0 12px 32px rgba(0,0,0,.35);font-size:13px;color:var(--strong);line-height:1.8;text-align:left}
  .fb-item:hover .fb-panel{display:block;animation:fadeIn .2s ease}
  .fb-panel .sub{color:var(--ter);font-size:12px}
  .fb-panel .qr-box{display:flex;flex-direction:column;align-items:center;gap:8px}
  .fb-top{display:none}
  .fb-top.show{display:flex}
  .fab,.fab-mask,.fab-sheet{display:none}
  @media(max-width:1100px){
    .float-bar{display:none}
    .fab{display:flex;position:fixed;right:20px;bottom:24px;z-index:300;width:52px;height:52px;border-radius:26px;background:var(--accent);color:#fff;align-items:center;justify-content:center;box-shadow:0 8px 24px rgba(0,112,243,.4);border:none}
    .fab-mask{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:398}
    .fab-mask.show{display:block}
    .fab-sheet{display:block;position:fixed;left:0;right:0;bottom:0;z-index:399;background:var(--bg);border-top:1px solid var(--line);border-radius:20px 20px 0 0;padding:12px 20px 28px;transform:translateY(100%);transition:transform .3s ease}
    .fab-sheet.show{transform:translateY(0)}
    .fab-sheet .sh-row{display:flex;align-items:center;gap:14px;padding:16px 4px;font-size:15px;color:var(--text);border-bottom:1px solid var(--line)}
    .fab-sheet .sh-row:last-child{border-bottom:none}
    .fab-sheet .sh-row svg{color:var(--accent)}
  }

  /* ===== 生态能力 TAB ===== */
  .eco-tabs{display:flex;gap:8px;justify-content:center;margin-bottom:40px;flex-wrap:wrap}
  .eco-tabs button{padding:10px 26px;border-radius:999px;background:var(--elevated);border:1px solid var(--line);color:var(--sec);font-size:14px;transition:all .2s;font-family:inherit}
  .eco-tabs button:hover{color:var(--text);border-color:var(--strong)}
  .eco-tabs button.on{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:500}
  .eco-card{max-width:1100px;margin:0 auto;background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:48px;position:relative;overflow:hidden}
  .eco-card::before{content:'';position:absolute;top:-120px;right:-120px;width:360px;height:360px;border-radius:50%;background:radial-gradient(circle,rgba(0,112,243,.14),transparent 70%);pointer-events:none}
  .eco-pane{display:none;gap:48px;align-items:center}
  .eco-pane.show{display:flex;animation:fadeIn .35s ease}
  .eco-left{flex:1;min-width:0}
  .eco-left h3{font-size:26px;font-weight:700;margin-bottom:14px}
  .eco-left p{color:var(--sec);line-height:1.9;font-size:15px}
  .eco-tags{display:flex;gap:10px;margin-top:22px;flex-wrap:wrap}
  .eco-tags span{font-size:12px;color:var(--accent);background:rgba(0,112,243,.12);padding:5px 12px;border-radius:6px;font-weight:500}
  .eco-right{width:420px;flex-shrink:0}
  .eco-chips{display:flex;flex-wrap:wrap;gap:12px}
  .eco-chip{display:flex;align-items:center;gap:8px;background:var(--elevated);border:1px solid var(--line);border-radius:999px;padding:10px 18px;font-size:14px;color:var(--strong);transition:border-color .2s,transform .2s}
  .eco-chip:hover{border-color:var(--accent);transform:translateY(-2px)}
  .eco-chip .nd{width:8px;height:8px;border-radius:4px}
  .eco-mock{background:var(--elevated);border:1px solid var(--line);border-radius:14px;padding:20px;font-size:13px}
  .mock-row{display:flex;gap:10px;margin-bottom:12px;align-items:flex-start}
  .mock-row:last-child{margin-bottom:0}
  .mock-bub{padding:10px 14px;border-radius:12px;line-height:1.6;color:var(--strong)}
  .mock-bub.user{background:rgba(0,112,243,.15);margin-left:auto;border-bottom-right-radius:4px}
  .mock-bub.ai{background:var(--surface);border:1px solid var(--line);border-bottom-left-radius:4px}
  .mock-code{font-family:Consolas,Menlo,monospace;color:var(--sec);line-height:1.9;font-size:12.5px}
  .mock-code .k{color:var(--accent)}
  @media(max-width:1100px){
    .eco-pane.show{flex-direction:column;align-items:stretch}
    .eco-right{width:100%}
    .eco-card{padding:28px}
  }

  /* reveal */
  .reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
  .reveal.in{opacity:1;transform:none}

  @media(max-width:1100px){
    .header-in{padding:0 20px}
    nav{display:none}
    .menu-btn{display:flex}
    section{padding:64px 20px}
    .hero{padding:64px 20px 56px}
    .p-hero{padding:64px 20px 40px}
    .plans{grid-template-columns:repeat(2,1fr);padding:0 20px 60px}
    .client-grid{grid-template-columns:repeat(2,1fr)}
    .testi-wrap{margin:0 -20px}
    .feat-body{flex-direction:column}
    .tab-list{width:100%}
    .demo{width:100%}
    .demo-body{flex-direction:column}
    .demo-left{width:100%}
    #trendChart{width:100%}
    .cmp-sec,.faq{padding:0 20px 60px}
    .stat-grid{grid-template-columns:repeat(2,1fr)}
    .contact-grid{grid-template-columns:1fr}
    .tbl-scroll{overflow-x:auto}
    .tbl-scroll table{min-width:680px}
    footer{padding:48px 20px 24px}
    .f-top{flex-direction:column;gap:40px}
    h1{font-size:40px}
    .sec-head{margin-bottom:40px}
    .cta{padding:64px 20px}
  }
  @media(max-width:640px){
    h1{font-size:32px}
    h2{font-size:28px}
    .hero-sub,.sec-sub{font-size:15px}
    .login{display:none}
    .h-right{gap:12px}
    .searchbar{height:56px;padding:0 6px 0 16px}
    .btn-query{padding:10px 22px;font-size:15px}
    .demo{padding:20px}
    .demo-head{flex-wrap:wrap;gap:10px}
    .metric-num{font-size:34px}
    .plans{grid-template-columns:1fr}
    .testi-card{width:300px;margin-right:16px}
    .client-grid{grid-template-columns:1fr}
    .client-card .st{flex-wrap:nowrap}
    .p-hero h1{font-size:30px}
    .cta-btns{flex-direction:column;width:100%}
    .cta-btns button{width:100%}
    .f-bottom{flex-direction:column;gap:12px}
    .f-links{gap:48px;flex-wrap:wrap}
    .auth-card{padding:28px 24px}
  }