:root{
      --bg:#f6f7fb;
      --panel:#ffffff;
      --panel-2:#fff7ef;
      --ink:#182033;
      --muted:#5f697f;
      --line:#e7eaf1;
      --accent:#ff5b4d;
      --accent-2:#1463ff;
      --accent-3:#ffd54a;
      --shadow:0 18px 50px rgba(24,32,51,.10);
      --radius:22px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",Arial,sans-serif;
      color:var(--ink);
      background:
        radial-gradient(circle at top left, rgba(255,91,77,.10), transparent 28%),
        radial-gradient(circle at top right, rgba(20,99,255,.10), transparent 24%),
        linear-gradient(180deg,#fff 0%, #f7f8fc 22%, #f4f6fb 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{max-width:var(--container);margin:0 auto;padding:0 20px}
    .site-header{
      position:sticky;top:0;z-index:40;
      backdrop-filter:saturate(160%) blur(12px);
      background:rgba(255,255,255,.82);
      border-bottom:1px solid rgba(231,234,241,.9);
    }
    .nav-wrap{
      display:flex;align-items:center;justify-content:space-between;gap:18px;
      min-height:76px;
    }
    .brand{
      display:flex;align-items:center;gap:12px;min-width:0
    }
    .brand .ai-page-logo{
      width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:4px;box-shadow:0 10px 24px rgba(20,99,255,.08)
    }
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:18px;line-height:1.15}
    .brand-text span{display:block;font-size:12px;color:var(--muted);margin-top:4px}
    .nav-toggle{
      display:none;border:1px solid var(--line);background:#fff;color:var(--ink);
      border-radius:14px;padding:10px 12px;font-size:14px;font-weight:700;
    }
    .nav-menu{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .nav-menu a{
      font-size:14px;color:var(--muted);padding:8px 2px;position:relative;white-space:nowrap
    }
    .nav-menu a:hover,.nav-menu a.active{color:var(--ink)}
    .nav-menu a::after{
      content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;background:linear-gradient(90deg,var(--accent),var(--accent-2));transform:scaleX(0);transform-origin:left;transition:.25s ease;
    }
    .nav-menu a:hover::after,.nav-menu a.active::after{transform:scaleX(1)}
    .hero{
      padding:44px 0 26px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch;
    }
    .hero-main,.hero-side,.section-card,.info-card,.review-card,.faq-item,.article-card,.case-card,.form-card,.price-card,.timeline-card,.tag-card,.compare-card{
      background:var(--panel);border:1px solid rgba(231,234,241,.95);border-radius:var(--radius);box-shadow:var(--shadow);
    }
    .hero-main{
      padding:34px;
      background:
        linear-gradient(135deg, rgba(255,91,77,.10), rgba(20,99,255,.08) 55%, rgba(255,213,74,.12));
      position:relative;overflow:hidden;
    }
    .hero-main::before,.hero-main::after{
      content:"";position:absolute;border-radius:50%;pointer-events:none;
      background:radial-gradient(circle, rgba(255,255,255,.92), rgba(255,255,255,0) 70%);
      filter:blur(2px);opacity:.65;
    }
    .hero-main::before{width:220px;height:220px;right:-70px;top:-70px}
    .hero-main::after{width:140px;height:140px;left:-40px;bottom:-40px}
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;
      background:#fff;color:#b83a2f;font-weight:700;font-size:13px;border:1px solid rgba(255,91,77,.18)
    }
    .hero h1{font-size:clamp(30px,4vw,52px);line-height:1.08;margin:16px 0 16px;letter-spacing:-.02em}
    .hero p{margin:0;color:#3e4760;font-size:16px;line-height:1.8;max-width:62ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:14px;
      padding:13px 18px;font-weight:800;font-size:15px;border:1px solid transparent;transition:.25s ease;
      cursor:pointer;user-select:none;
    }
    .btn-primary{background:linear-gradient(135deg,var(--accent),#ff8a4d);color:#fff;box-shadow:0 14px 28px rgba(255,91,77,.28)}
    .btn-primary:hover{transform:translateY(-2px)}
    .btn-secondary{background:#fff;color:var(--ink);border-color:var(--line)}
    .btn-secondary:hover{transform:translateY(-2px);border-color:#cfd6e4}
    .hero-metrics{
      display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:26px
    }
    .metric{
      background:rgba(255,255,255,.82);border:1px solid rgba(231,234,241,.95);border-radius:18px;padding:16px 15px
    }
    .metric strong{display:block;font-size:24px;line-height:1.1}
    .metric span{display:block;margin-top:6px;font-size:13px;color:var(--muted)}
    .hero-side{
      padding:22px;display:flex;flex-direction:column;gap:14px;
      background:linear-gradient(180deg,#fff 0%, #fff9f2 100%);
    }
    .side-top{
      display:flex;align-items:center;justify-content:space-between;gap:12px;
      padding:8px 2px 6px;
    }
    .side-top h2{margin:0;font-size:18px}
    .badge{
      display:inline-flex;align-items:center;padding:7px 10px;border-radius:999px;background:#f1f6ff;color:#2457d6;font-size:12px;font-weight:700
    }
    .side-list{display:grid;gap:12px;margin:0;padding:0;list-style:none}
    .side-list li{
      display:flex;gap:10px;align-items:flex-start;padding:14px;border:1px solid var(--line);border-radius:16px;background:#fff
    }
    .dot{width:10px;height:10px;border-radius:50%;margin-top:5px;background:linear-gradient(135deg,var(--accent),var(--accent-2))}
    .side-list strong{display:block;font-size:14px;margin-bottom:3px}
    .side-list span{display:block;color:var(--muted);font-size:13px;line-height:1.65}
    .section{
      padding:18px 0 2px;
    }
    .section-head{
      display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px
    }
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);max-width:68ch;line-height:1.7}
    .section-card{padding:24px}
    .intro-grid,.service-grid,.review-grid,.case-grid,.article-grid,.network-grid,.tag-grid,.contact-grid,.compare-grid{
      display:grid;gap:16px
    }
    .intro-grid{grid-template-columns:1.1fr .9fr}
    .mini-panel{
      padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff, #fafbfe);border:1px solid var(--line)
    }
    .feature-pills{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
    .pill{padding:9px 12px;border-radius:999px;background:#f3f6ff;color:#26406a;font-size:13px;font-weight:700}
    .service-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
    .service-card,.step-card,.value-card{
      padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff 0%, #fcfdff 100%);border:1px solid var(--line)
    }
    .service-card:hover,.case-card:hover,.article-card:hover,.review-card:hover,.faq-item:hover,.compare-card:hover,.form-card:hover{transform:translateY(-3px);transition:.22s ease;box-shadow:0 20px 44px rgba(24,32,51,.12)}
    .service-card h3,.step-card h3,.value-card h3,.case-card h3,.article-card h3,.review-card h3{margin:0 0 10px;font-size:18px}
    .service-card p,.step-card p,.value-card p,.case-card p,.article-card p,.review-card p{margin:0;color:var(--muted);line-height:1.72;font-size:14px}
    .kpi-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .kpi{
      padding:18px;border-radius:18px;background:linear-gradient(135deg,#ffffff 0%,#fff8ef 100%);border:1px solid var(--line)
    }
    .kpi strong{display:block;font-size:26px}
    .kpi span{display:block;margin-top:7px;font-size:13px;color:var(--muted);line-height:1.55}
    .steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .step-num{
      width:36px;height:36px;border-radius:12px;display:grid;place-items:center;font-weight:900;color:#fff;
      background:linear-gradient(135deg,var(--accent),var(--accent-2));margin-bottom:12px
    }
    .compare-grid{grid-template-columns:1.15fr .85fr}
    .table-wrap{
      overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff
    }
    table{width:100%;border-collapse:collapse;min-width:720px}
    th,td{padding:14px 14px;border-bottom:1px solid var(--line);text-align:left;font-size:14px;vertical-align:top}
    th{background:#f8faff;color:var(--ink);font-size:13px}
    td{color:#2e3850}
    .rating{
      display:grid;gap:12px
    }
    .rating-box{
      padding:20px;border-radius:18px;background:linear-gradient(135deg,#1d2b55,#2f5dff);color:#fff
    }
    .rating-box strong{display:block;font-size:24px;margin-top:4px}
    .rating-list{display:grid;gap:10px}
    .rating-list div{padding:12px 14px;border-radius:14px;background:#fff;border:1px solid var(--line)}
    .split-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
    .price-card,.timeline-card,.tag-card{padding:18px}
    .price-list,.timeline-list,.tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .price-list .price-item,.timeline-list .time-item{
      padding:10px 12px;border-radius:999px;background:#f5f7fc;border:1px solid var(--line);font-size:13px;color:#33415c
    }
    .tag-cloud a,.tag-cloud span{
      padding:10px 12px;border-radius:999px;background:linear-gradient(180deg,#fff,#f7f9ff);border:1px solid var(--line);font-size:13px;color:#394863
    }
    .review-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
    .review-card{padding:18px}
    .review-meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
    .stars{color:#ff9b1a;font-size:15px;letter-spacing:1px}
    .case-grid,.article-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
    .case-card,.article-card{padding:18px}
    .case-card .label,.article-card .label{display:inline-flex;margin-bottom:12px;padding:7px 10px;border-radius:999px;background:#f4f8ff;color:#2457d6;font-size:12px;font-weight:700}
    .faq-list{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{
      width:100%;border:0;background:transparent;padding:18px 18px;text-align:left;font-size:16px;font-weight:800;color:var(--ink);
      display:flex;align-items:center;justify-content:space-between;gap:14px;cursor:pointer
    }
    .faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;padding:0 18px}
    .faq-a p{margin:0 0 16px;color:var(--muted);line-height:1.75}
    .faq-item.open .faq-a{max-height:180px}
    .faq-item.open .faq-q .chev{transform:rotate(180deg)}
    .chev{transition:.2s ease;color:#64718b}
    .contact-grid{grid-template-columns:1fr .9fr}
    .form-card{padding:20px}
    .form-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .field{display:grid;gap:8px}
    label{font-size:13px;font-weight:700;color:#364158}
    input,select,textarea{
      width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--ink);
      padding:13px 14px;font:inherit;outline:none;transition:.2s ease;
    }
    input:focus,select:focus,textarea:focus{border-color:#89aaff;box-shadow:0 0 0 4px rgba(20,99,255,.08)}
    textarea{min-height:126px;resize:vertical}
    .help-list{display:grid;gap:12px}
    .help-item{
      padding:14px 16px;border-radius:16px;background:#fff;border:1px solid var(--line)
    }
    .help-item strong{display:block;margin-bottom:6px}
    .help-item span{display:block;color:var(--muted);font-size:13px;line-height:1.7}
    .footer{
      margin-top:24px;padding:24px 0 30px;border-top:1px solid rgba(231,234,241,.95);
      background:#f8f9fd;color:#23304a
    }
    .footer-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:16px;align-items:start}
    .footer a{color:#183c96}
    .footer small,.footer p,.footer li{color:#44516b}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}
    .footer-links a{padding:9px 11px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px}
    .footer-bottom{margin-top:16px;padding-top:14px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
    .float-box{
      position:fixed;right:18px;bottom:18px;z-index:50;display:grid;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),#ff8f4c);
      color:#fff;box-shadow:0 14px 26px rgba(255,91,77,.26);border:0;cursor:pointer
    }
    .float-link{
      padding:12px 14px;border-radius:16px;background:#fff;border:1px solid var(--line);box-shadow:0 10px 24px rgba(24,32,51,.10);
      font-size:13px;color:var(--ink);font-weight:800
    }
    .kefu-card{
      position:fixed;left:18px;bottom:18px;z-index:45;width:220px;padding:12px;border-radius:20px;background:#fff;border:1px solid var(--line);box-shadow:0 18px 36px rgba(24,32,51,.12)
    }
    .kefu-card img{border-radius:14px;border:1px solid var(--line)}
    .kefu-card strong{display:block;margin:10px 0 6px}
    .kefu-card span{display:block;font-size:12px;color:var(--muted);line-height:1.6}
    .reveal{opacity:0;transform:translateY(16px);transition:.55s ease}
    .reveal.in{opacity:1;transform:none}
    .section-anchor{scroll-margin-top:92px}
    .mobile-only{display:none}
    @media (max-width: 1080px){
      .hero-grid,.intro-grid,.compare-grid,.contact-grid,.footer-grid{grid-template-columns:1fr}
      .service-grid,.steps,.review-grid,.case-grid,.article-grid,.kpi-row{grid-template-columns:repeat(2,minmax(0,1fr))}
    }
    @media (max-width: 820px){
      .nav-toggle{display:inline-flex}
      .nav-menu{
        display:none;position:absolute;left:20px;right:20px;top:76px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);
        flex-direction:column;align-items:flex-start;gap:6px
      }
      .nav-menu.open{display:flex}
      .nav-menu a{padding:10px 8px;width:100%}
      .hero{padding-top:22px}
      .hero-main{padding:24px}
      .hero-metrics,.service-grid,.steps,.review-grid,.case-grid,.article-grid,.kpi-row,.form-row,.split-grid{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .kefu-card{display:none}
      .mobile-only{display:inline-flex}
    }
    @media (max-width: 560px){
      .container{padding:0 16px}
      .brand-text span{display:none}
      .hero h1{font-size:30px}
      .section-card{padding:18px}
      .hero-main,.hero-side,.form-card,.compare-card,.price-card,.timeline-card,.tag-card{border-radius:20px}
      .btn{width:100%}
      .hero-actions{gap:10px}
    }