:root{
      --bg:#f5f7fb;
      --surface:#ffffff;
      --surface-2:#f8fbff;
      --text:#102033;
      --muted:#5b6b7f;
      --line:#d8e2ef;
      --primary:#1677ff;
      --primary-2:#24c8ff;
      --accent:#00c2a8;
      --warm:#fff6e8;
      --shadow:0 18px 50px rgba(16,32,51,.08);
      --shadow-2:0 10px 24px rgba(22,119,255,.14);
      --radius:20px;
      --radius-sm:14px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(36,200,255,.14), transparent 30%),
        radial-gradient(circle at top right, rgba(0,194,168,.12), transparent 24%),
        linear-gradient(180deg, #ffffff 0%, #f7faff 28%, #f4f7fc 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(100% - 32px, var(--container));margin:0 auto}
    .site-header{
      position:sticky;top:0;z-index:30;
      backdrop-filter:saturate(180%) blur(16px);
      background:rgba(255,255,255,.82);
      border-bottom:1px solid rgba(216,226,239,.8);
    }
    .nav{
      display:flex;align-items:center;justify-content:space-between;gap:18px;
      min-height:74px;
    }
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:10px;background:#fff;box-shadow:0 6px 18px rgba(16,32,51,.08);padding:4px}
    .brand-text{display:flex;flex-direction:column;line-height:1.1;min-width:0}
    .brand-text strong{font-size:18px;letter-spacing:.5px}
    .brand-text span{font-size:12px;color:var(--muted)}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:12px;padding:10px 12px}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#304258;padding:8px 10px;border-radius:10px;transition:.2s}
    .nav-links a:hover,.nav-links a.active{background:#eef5ff;color:var(--primary)}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border:1px solid transparent;border-radius:999px;padding:12px 18px;font-weight:700;
      transition:.25s ease;cursor:pointer;white-space:nowrap
    }
    .btn-primary{background:linear-gradient(135deg,var(--primary),#4aa3ff);color:#fff;box-shadow:var(--shadow-2)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 32px rgba(22,119,255,.22)}
    .btn-light{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-light:hover{border-color:#b8c9dd;transform:translateY(-2px)}
    .hero{padding:34px 0 18px}
    .hero-grid{
      display:grid;grid-template-columns:1.25fr .75fr;gap:22px;align-items:stretch
    }
    .hero-main,.hero-side,.card,.panel,.faq-item,.form-card,.review-card,.article-card,.compare-card,.price-card{
      background:rgba(255,255,255,.9);border:1px solid rgba(216,226,239,.9);box-shadow:var(--shadow);border-radius:var(--radius)
    }
    .hero-main{padding:34px;position:relative;overflow:hidden}
    .hero-main:before,.hero-main:after{
      content:"";position:absolute;border-radius:999px;filter:blur(2px);pointer-events:none
    }
    .hero-main:before{width:260px;height:260px;right:-120px;top:-90px;background:radial-gradient(circle, rgba(36,200,255,.22), transparent 70%)}
    .hero-main:after{width:220px;height:220px;left:-80px;bottom:-90px;background:radial-gradient(circle, rgba(0,194,168,.18), transparent 70%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#eaf4ff,#eefdfb);color:#1151a8;border:1px solid #d6e9ff;border-radius:999px;padding:8px 12px;font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,4vw,54px);line-height:1.06;letter-spacing:-.03em}
    .lead{margin:0;color:var(--muted);font-size:16px;line-height:1.85;max-width:56ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-highlights{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}
    .mini-stat{background:linear-gradient(180deg,#fafdff,#f4f9ff);border:1px solid #dfeaf8;border-radius:16px;padding:14px}
    .mini-stat strong{display:block;font-size:20px;color:#0e2d55}
    .mini-stat span{font-size:12px;color:var(--muted)}
    .hero-side{padding:20px;display:grid;gap:14px}
    .side-list{display:grid;gap:12px}
    .side-item{padding:14px 14px 14px 16px;border-radius:16px;background:linear-gradient(180deg,#fff,#f9fcff);border:1px solid #e3ebf6}
    .side-item strong{display:block;margin-bottom:6px}
    .side-item p{margin:0;color:var(--muted);font-size:13px;line-height:1.7}
    .section{padding:22px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:26px}
    .section-head p{margin:0;color:var(--muted);max-width:58ch;line-height:1.8;font-size:14px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .stat-card,.service-card,.case-card,.review-card,.article-card,.price-card{padding:18px}
    .stat-card{position:relative;overflow:hidden}
    .stat-card:before{content:"";position:absolute;inset:auto -20px -26px auto;width:96px;height:96px;border-radius:50%;background:radial-gradient(circle, rgba(22,119,255,.16), transparent 70%)}
    .stat-card .num{font-size:26px;font-weight:800;margin:0 0 8px}
    .stat-card .desc,.service-card p,.case-card p,.review-card p,.article-card p{margin:0;color:var(--muted);line-height:1.75;font-size:14px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 12px;border-radius:999px;background:#f2f7ff;border:1px solid #d9e6f7;color:#27507f;font-size:13px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .service-card h3,.case-card h3,.review-card h3,.article-card h3,.price-card h3{margin:0 0 10px;font-size:18px}
    .service-card .badge{display:inline-flex;margin-bottom:12px;padding:6px 10px;border-radius:999px;background:#eefbf7;color:#0b7b6f;font-size:12px;font-weight:700}
    .flow{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff,#f6faff);border:1px solid #e1eaf6}
    .step .index{display:inline-flex;width:32px;height:32px;border-radius:10px;align-items:center;justify-content:center;background:linear-gradient(135deg,#1677ff,#24c8ff);color:#fff;font-weight:800;margin-bottom:12px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:16px 14px;border-bottom:1px solid #e8eff7;text-align:left;vertical-align:top}
    th{background:#f4f8ff;font-size:14px}
    td{font-size:14px;color:#314255;line-height:1.7}
    .rating{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#fff7e7;color:#9b5b00;border:1px solid #ffe0aa;font-weight:700}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .panel{padding:20px}
    .timeline{display:grid;gap:14px}
    .timeline-item{display:grid;grid-template-columns:76px 1fr;gap:14px;align-items:start;padding:16px;border-radius:16px;background:#fbfdff;border:1px solid #e4edf7}
    .timeline-item strong{display:block;color:#0f2a4d}
    .timeline-item span{color:var(--muted);font-size:13px;line-height:1.7}
    .accordion{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{width:100%;padding:18px 18px;background:transparent;border:0;display:flex;justify-content:space-between;align-items:center;color:var(--text);font-size:16px;font-weight:700;text-align:left;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 18px;color:var(--muted);line-height:1.8}
    .faq-item.open .faq-a{max-height:180px;padding-bottom:18px}
    .faq-item.open .chev{transform:rotate(180deg)}
    .chev{transition:transform .25s ease;color:var(--primary)}
    .form-card form{display:grid;gap:12px}
    .fields{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    input,select,textarea{
      width:100%;border:1px solid #d8e2ef;border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text);outline:none
    }
    textarea{min-height:120px;resize:vertical;grid-column:1/-1}
    input:focus,select:focus,textarea:focus{border-color:#7bb6ff;box-shadow:0 0 0 4px rgba(22,119,255,.08)}
    .submit-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between}
    .reviews,.articles,.cases,.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .review-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
    .stars{color:#ffb400;letter-spacing:1px}
    .section-box{padding:20px;background:linear-gradient(180deg,#ffffff,#f7fbff);border:1px solid #e2ebf6;border-radius:24px}
    .footer{
      margin-top:22px;background:#0d1b2b;color:#eaf1fb;border-top:1px solid rgba(255,255,255,.08)
    }
    .footer a{color:#d7ebff}
    .footer .container{padding:28px 0}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr 1fr;gap:16px;align-items:start}
    .footer h3{margin:0 0 12px;font-size:18px;color:#fff}
    .footer p,.footer li,.footer small{color:#b9c8da;line-height:1.8}
    .footer ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
    .footer-bottom{margin-top:18px;padding-top:16px;border-top:1px solid rgba(255,255,255,.08);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:40;display:grid;gap:10px
    }
    .float-btn{
      width:48px;height:48px;border-radius:16px;border:0;background:linear-gradient(135deg,#1677ff,#24c8ff);color:#fff;box-shadow:var(--shadow-2);cursor:pointer
    }
    .service-rail{
      position:fixed;left:14px;bottom:18px;z-index:35;background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow);max-width:220px
    }
    .service-rail strong{display:block;margin-bottom:8px}
    .service-rail img{border-radius:12px;border:1px solid #e5edf7}
    .fade-in{opacity:0;transform:translateY(16px);transition:.7s ease}
    .fade-in.show{opacity:1;transform:none}
    .muted{color:var(--muted)}
    .note{font-size:12px;color:var(--muted);line-height:1.7}
    .article-list{display:grid;gap:12px}
    .article-link{display:flex;justify-content:space-between;gap:12px;padding:14px 16px;border-radius:16px;background:#f8fbff;border:1px solid #e2ebf6}
    .article-link span{color:var(--muted);font-size:13px}
    .home-link{color:var(--primary);font-weight:700}
    @media (max-width: 1080px){
      .hero-grid,.grid-4,.grid-3,.flow,.reviews,.articles,.cases,.pricing,.footer-grid,.split{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 760px){
      .nav-toggle{display:inline-flex}
      .nav-links{
        position:absolute;left:16px;right:16px;top:74px;display:none;flex-direction:column;align-items:stretch;
        background:rgba(255,255,255,.98);border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow)
      }
      .nav-links.open{display:flex}
      .nav-links a,.nav-links .btn{justify-content:center}
      .hero{padding-top:20px}
      .hero-main{padding:24px}
      .hero-highlights,.grid-4,.grid-3,.flow,.reviews,.articles,.cases,.pricing,.footer-grid,.split,.fields{grid-template-columns:1fr}
      .section-head{align-items:start;flex-direction:column}
      .service-rail{display:none}
      table{min-width:760px}
      .timeline-item{grid-template-columns:1fr}
    }