:root{
      --bg:#f6f8fc;
      --bg2:#eef3ff;
      --card:#ffffff;
      --text:#132033;
      --muted:#5e6b83;
      --line:#dbe3f0;
      --brand:#2563eb;
      --brand2:#14b8a6;
      --accent:#f97316;
      --shadow:0 18px 48px rgba(28, 49, 88, .12);
      --radius:22px;
      --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(37,99,235,.10), transparent 30%),
        radial-gradient(circle at top right, rgba(20,184,166,.10), transparent 28%),
        linear-gradient(180deg, #fff 0%, var(--bg) 38%, #f8fbff 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{max-width:var(--container);margin:0 auto;padding:0 20px}
    .topbar{
      position:sticky;top:0;z-index:60;
      backdrop-filter:saturate(180%) blur(12px);
      background:rgba(255,255,255,.86);
      border-bottom:1px solid rgba(219,227,240,.75);
    }
    .nav{
      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}
    .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;box-shadow:0 8px 24px rgba(18,31,53,.08)}
    .brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
    .brand-text strong{font-size:16px;letter-spacing:.2px}
    .brand-text span{font-size:12px;color:var(--muted)}
    .menu-btn{
      display:none;border:1px solid var(--line);background:#fff;color:var(--text);
      border-radius:14px;padding:10px 12px;cursor:pointer;
    }
    .nav-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#2a3550;padding:8px 0;position:relative}
    .nav-links a::after{
      content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;background:var(--brand);
      transform:scaleX(0);transform-origin:center;transition:.22s ease;
    }
    .nav-links a:hover::after{transform:scaleX(1)}
    .nav-cta{
      padding:11px 16px;border-radius:999px;background:linear-gradient(135deg,var(--brand),#4f8cff);
      color:#fff;font-weight:700;box-shadow:0 14px 30px rgba(37,99,235,.22)
    }
    main{overflow:hidden}
    section{padding:74px 0}
    .hero{padding:34px 0 58px;position:relative}
    .hero-grid{
      display:grid;grid-template-columns:1.18fr .82fr;gap:28px;align-items:stretch
    }
    .hero-card,.panel,.card,.faq-item,.review,.case,.article,.form-wrap,.compare{
      background:rgba(255,255,255,.94);border:1px solid rgba(219,227,240,.9);border-radius:var(--radius);box-shadow:var(--shadow)
    }
    .hero-card{padding:34px;position:relative;overflow:hidden}
    .hero-card::before{
      content:"";position:absolute;inset:auto -70px -90px auto;width:230px;height:230px;border-radius:50%;
      background:radial-gradient(circle, rgba(20,184,166,.20), transparent 68%);
    }
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      padding:8px 12px;border-radius:999px;background:#eef5ff;color:#2453c7;
      font-size:13px;font-weight:700;margin-bottom:16px
    }
    h1{margin:0 0 14px;font-size:clamp(32px,4vw,56px);line-height:1.08;letter-spacing:-.5px}
    .hero p{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:10px;border:none;cursor:pointer;
      padding:13px 18px;border-radius:14px;font-weight:700;transition:.24s ease;transform:translateY(0)
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),#3b82f6);color:#fff}
    .btn-secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
    .btn:hover,.card:hover,.review:hover,.article:hover,.case:hover,.faq-item:hover{transform:translateY(-3px)}
    .hero-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:28px}
    .mini-stat{
      padding:16px;border-radius:18px;background:linear-gradient(180deg,#fff,#f7fbff);
      border:1px solid var(--line)
    }
    .mini-stat strong{display:block;font-size:22px;margin-bottom:4px}
    .mini-stat span{font-size:13px;color:var(--muted)}
    .hero-side{display:grid;gap:16px}
    .side-panel{
      padding:22px;border-radius:var(--radius);background:linear-gradient(180deg,#0f172a,#1d4ed8);
      color:#fff;box-shadow:0 18px 42px rgba(15,23,42,.22)
    }
    .side-panel h2,.side-panel p,.side-panel li{color:#fff}
    .side-panel h2{margin:0 0 10px;font-size:22px}
    .side-panel p{margin:0 0 16px;color:rgba(255,255,255,.85);line-height:1.75}
    .chip-list{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:8px 10px;border-radius:999px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);font-size:13px}
    .sub-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:22px}
    .section-head h2{margin:0;font-size:30px;line-height:1.15}
    .section-head p{margin:0;color:var(--muted);max-width:60ch;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
    .card,.panel,.review,.case,.article,.form-wrap,.compare{padding:22px}
    .icon{
      width:48px;height:48px;border-radius:16px;display:grid;place-items:center;margin-bottom:14px;
      background:linear-gradient(135deg,rgba(37,99,235,.13),rgba(20,184,166,.13));color:var(--brand);font-size:22px
    }
    h3{margin:0 0 10px;font-size:20px}
    .muted{color:var(--muted);line-height:1.75;margin:0}
    .tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
    .tag{padding:7px 10px;border-radius:999px;background:#f3f7ff;border:1px solid #dce7ff;font-size:13px;color:#29406d}
    .steps{counter-reset:s}
    .step{position:relative;padding-top:6px}
    .step::before{
      counter-increment:s;content:counter(s,decimal-leading-zero);
      display:inline-flex;align-items:center;justify-content:center;
      width:38px;height:38px;border-radius:12px;background:#eef5ff;color:var(--brand);font-weight:800;margin-bottom:14px
    }
    table{width:100%;border-collapse:separate;border-spacing:0;min-width:780px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line)}
    th,td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f7faff;font-size:14px}
    tr:last-child td{border-bottom:none}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:700}
    .badge.good{background:#e9fff6;color:#067857}
    .badge.warn{background:#fff7e9;color:#b45309}
    .compare-box{
      display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;margin-top:18px
    }
    .rating{
      display:flex;flex-direction:column;align-items:flex-end;gap:8px;text-align:right
    }
    .rating strong{font-size:40px;line-height:1;color:var(--brand)}
    .rating span{color:var(--muted);font-size:14px}
    .faq-list{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{
      width:100%;padding:18px 20px;background:transparent;border:none;cursor:pointer;
      display:flex;align-items:center;justify-content:space-between;gap:14px;color:var(--text);font-size:16px;font-weight:700;text-align:left
    }
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease,padding .28s ease;border-top:1px solid transparent}
    .faq-item.open .faq-a{max-height:180px;padding:0 20px 18px}
    .faq-item.open .faq-q{color:var(--brand)}
    .faq-a p{margin:0;color:var(--muted);line-height:1.75}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .review .meta{display:flex;align-items:center;gap:12px;margin-bottom:12px}
    .avatar{
      width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#dbeafe,#cffafe);
      color:#1d4ed8;font-weight:800
    }
    .review .role{font-size:13px;color:var(--muted)}
    .case-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
    .case img,.article img{width:100%;border-radius:18px;margin-bottom:14px;aspect-ratio:16/9;object-fit:cover;border:1px solid var(--line)}
    .article .meta-line{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0 0}
    .article .meta-line span{font-size:12px;padding:6px 9px;border-radius:999px;background:#f4f7fc;color:#4c5b74}
    .info-cols{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    input,select,textarea{
      width:100%;padding:13px 14px;border:1px solid #cfd9ea;border-radius:14px;background:#fff;color:var(--text);
      font:inherit;outline:none;transition:border-color .2s,box-shadow .2s
    }
    textarea{min-height:130px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:rgba(37,99,235,.75);box-shadow:0 0 0 4px rgba(37,99,235,.12)}
    .full{grid-column:1/-1}
    .links-list{display:flex;flex-wrap:wrap;gap:10px}
    .links-list a,.footer-links a{
      padding:9px 12px;border-radius:12px;background:#f5f8fd;border:1px solid var(--line);color:#21324f;font-size:14px
    }
    .price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .price{border:1px solid var(--line);border-radius:20px;background:linear-gradient(180deg,#fff,#f8fbff);padding:22px}
    .price strong{display:block;font-size:28px;color:var(--brand);margin:8px 0}
    .timeline{display:grid;gap:14px}
    .timeline-item{display:grid;grid-template-columns:80px 1fr;gap:14px;padding:16px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .timeline-item b{display:block;color:var(--brand);margin-bottom:6px}
    .footer{
      padding:32px 0 22px;background:#0f172a;color:#dbe7ff;margin-top:8px
    }
    .footer a{color:#e6f0ff}
    .footer .container{display:grid;gap:18px}
    .footer-top{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
    .footer .muted,.footer p{color:#aec1e8}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-bottom{
      border-top:1px solid rgba(255,255,255,.12);padding-top:14px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap
    }
    .floating{
      position:fixed;right:18px;bottom:18px;z-index:70;display:grid;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:18px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),#4f8cff);
      color:#fff;box-shadow:0 16px 30px rgba(37,99,235,.26);border:none;cursor:pointer
    }
    .float-card{
      position:fixed;right:18px;bottom:84px;z-index:69;width:min(330px,calc(100vw - 36px));
      background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:16px;display:none
    }
    .float-card.open{display:block}
    .float-card img{width:100%;border-radius:16px;border:1px solid var(--line)}
    .float-card .row{display:flex;justify-content:space-between;gap:10px;margin-top:12px;align-items:center}
    .scroll-top{position:fixed;right:18px;bottom:146px;z-index:70;opacity:0;pointer-events:none;transition:.2s}
    .scroll-top.show{opacity:1;pointer-events:auto}
    .scroll-top .float-btn{background:linear-gradient(135deg,#111827,#2563eb)}
    .mobile-hide{display:block}
    .article-list{display:grid;gap:12px}
    .article-link{
      display:flex;justify-content:space-between;gap:12px;align-items:center;padding:14px 16px;border:1px solid var(--line);
      border-radius:16px;background:#fff
    }
    .article-link span{color:var(--muted);font-size:13px}
    .hero-link{display:inline-flex;align-items:center;gap:8px;font-weight:700;color:#fff}
    .banner-strip{
      display:grid;grid-template-columns:repeat(4,1fr);gap:14px
    }
    .banner-strip img{
      border-radius:18px;border:1px solid var(--line);aspect-ratio:1/1;object-fit:cover;background:#fff
    }
    .section-soft{background:linear-gradient(180deg,rgba(37,99,235,.03),rgba(20,184,166,.03))}
    .reveal{opacity:0;transform:translateY(18px);transition:.55s ease}
    .reveal.show{opacity:1;transform:none}
    @media (max-width: 1024px){
      .hero-grid,.grid-4,.reviews,.price-grid,.footer-top,.info-cols,.case-grid,.grid-3{grid-template-columns:1fr 1fr}
      .banner-strip{grid-template-columns:repeat(2,1fr)}
      .hero-meta,.sub-grid{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 760px){
      .menu-btn{display:inline-flex}
      .nav{min-height:68px}
      .nav-links{
        position:absolute;left:20px;right:20px;top:76px;background:#fff;border:1px solid var(--line);border-radius:20px;
        padding:14px;display:none;flex-direction:column;align-items:stretch;box-shadow:var(--shadow)
      }
      .nav-links.open{display:flex}
      .nav-links a{padding:10px 2px}
      .hero-grid,.hero-meta,.sub-grid,.grid-4,.grid-3,.reviews,.price-grid,.footer-top,.info-cols,.case-grid,.form-grid{grid-template-columns:1fr}
      .hero-card{padding:24px}
      .section-head{flex-direction:column;align-items:start}
      section{padding:58px 0}
      .mobile-hide{display:none}
      .compare-box{grid-template-columns:1fr}
      .rating{align-items:flex-start;text-align:left}
      table{min-width:920px}
      .timeline-item{grid-template-columns:1fr}
      .floating{right:14px;bottom:14px}
      .scroll-top{right:14px;bottom:142px}
      .float-card{right:14px;bottom:80px}
    }