:root{
      --bg:#f6f4ff;
      --bg2:#fff9fe;
      --card:#ffffff;
      --text:#1f2430;
      --muted:#5f6678;
      --line:#e7e0ff;
      --primary:#6b4eff;
      --primary2:#9b6bff;
      --accent:#ff5aa5;
      --shadow:0 18px 40px rgba(73, 46, 160, .12);
      --radius:22px;
      --radius-sm:16px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(107,78,255,.12), transparent 28%),
        radial-gradient(circle at 85% 10%, rgba(255,90,165,.12), transparent 20%),
        linear-gradient(180deg, var(--bg) 0%, #fbf9ff 40%, #ffffff 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:20;
      background:rgba(246,244,255,.82);
      backdrop-filter:blur(16px);
      border-bottom:1px solid rgba(231,224,255,.75);
    }
    .nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain}
    .brand strong{display:block;font-size:16px}
    .brand span{display:block;font-size:12px;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:14px;align-items:center}
    .nav-links a{font-size:14px;color:#30384a;padding:8px 10px;border-radius:999px}
    .nav-links a:hover,.nav-links a:focus-visible{background:#efe9ff;color:var(--primary)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border:none;border-radius:999px;padding:12px 18px;font-weight:700;
      transition:.25s ease;cursor:pointer;
    }
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 12px 28px rgba(107,78,255,.24)}
    .btn-ghost{background:#fff;color:var(--primary);border:1px solid var(--line)}
    .btn:hover{transform:translateY(-1px);box-shadow:0 14px 32px rgba(73,46,160,.18)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px}
    .hero{padding:38px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.18fr .82fr;gap:22px;align-items:stretch}
    .hero-copy,.hero-panel,.section-card,.metric,.service-card,.case-card,.comment-card,.article-card,.info-card,.faq-item,.compare-table,.form-card,.timeline-card,.network-card,.pricing-card{
      background:var(--card);border:1px solid rgba(231,224,255,.95);border-radius:var(--radius);box-shadow:var(--shadow)
    }
    .hero-copy{padding:30px;position:relative;overflow:hidden}
    .hero-copy:before{
      content:"";position:absolute;inset:auto -40px -40px auto;width:180px;height:180px;border-radius:50%;
      background:radial-gradient(circle, rgba(107,78,255,.16), transparent 65%);
    }
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#f1ebff;color:var(--primary);font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,4vw,52px);line-height:1.08;letter-spacing:-.02em}
    .hero-copy p{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:62ch}
    .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{padding:14px;border-radius:18px;background:linear-gradient(180deg,#fff,#f8f5ff);border:1px solid var(--line)}
    .mini-stat strong{display:block;font-size:18px}
    .mini-stat span{font-size:12px;color:var(--muted)}
    .hero-panel{padding:22px;background:linear-gradient(180deg,#ffffff 0%,#f8f4ff 100%)}
    .panel-top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
    .panel-top h2{margin:0;font-size:20px}
    .panel-top p{margin:6px 0 0;color:var(--muted);font-size:14px;line-height:1.7}
    .pill-grid{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
    .pill{padding:10px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:#334}
    .panel-list{margin-top:18px;display:grid;gap:10px}
    .panel-item{display:flex;gap:10px;align-items:flex-start;padding:12px 14px;border-radius:16px;background:#fff;border:1px solid #eee8ff}
    .dot{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--primary))}
    section{padding:18px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:14px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);line-height:1.7;max-width:68ch}
    .section-card{padding:22px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .metric,.service-card,.case-card,.comment-card,.article-card,.info-card,.faq-item,.pricing-card{padding:18px}
    .metric strong{display:block;font-size:28px;color:var(--primary)}
    .metric span{display:block;margin-top:8px;color:var(--muted);line-height:1.6}
    .service-card h3,.case-card h3,.article-card h3,.info-card h3,.pricing-card h3{margin:0 0 10px;font-size:18px}
    .service-card p,.case-card p,.article-card p,.info-card p,.pricing-card p,.comment-card p{margin:0;color:var(--muted);line-height:1.75}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:9px 12px;border-radius:999px;background:#f5f0ff;border:1px solid #e7defd;font-size:13px}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:grid;grid-template-columns:72px 1fr;gap:14px;align-items:start;padding:14px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .timeline-item b{display:inline-flex;width:72px;height:38px;align-items:center;justify-content:center;border-radius:12px;background:#f2ebff;color:var(--primary)}
    .compare-wrap{overflow:auto}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:14px 12px;border-bottom:1px solid #efe8ff;text-align:left;vertical-align:top}
    th{background:#f8f5ff;color:#2c3150;font-size:14px}
    td{color:#4d5468;font-size:14px;line-height:1.7}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:700}
    .badge.good{background:#eaf9f0;color:#11864d}
    .badge.warn{background:#fff1ef;color:#c64f39}
    .score-box{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 18px;border-radius:18px;background:linear-gradient(135deg,#6b4eff,#9b6bff);color:#fff;margin-top:14px}
    .score-box strong{font-size:28px}
    details{border-top:1px solid #eee8ff;padding-top:12px}
    details+details{margin-top:12px}
    summary{cursor:pointer;font-weight:700;list-style:none}
    summary::-webkit-details-marker{display:none}
    summary span{float:right;color:var(--primary)}
    .faq-item p{margin-top:12px}
    .reviews .comment-card{display:flex;flex-direction:column;gap:12px}
    .review-top{display:flex;justify-content:space-between;gap:10px;align-items:center}
    .stars{color:#ffb100;letter-spacing:2px}
    .form-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:14px}
    .form-card form{display:grid;gap:12px}
    .field-row{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    input,select,textarea{
      width:100%;border:1px solid #e4ddfb;border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text)
    }
    textarea{min-height:120px;resize:vertical}
    label{display:block;font-size:13px;font-weight:700;margin-bottom:8px;color:#394158}
    .helper{font-size:13px;color:var(--muted);line-height:1.7}
    .contact-list{display:grid;gap:12px}
    .contact-item{padding:14px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .footer{
      margin-top:18px;padding:24px 0 18px;background:#f4f0ff;border-top:1px solid #e7defd;color:#283044
    }
    .footer a{color:#2b3a75}
    .footer-grid{display:grid;grid-template-columns:1.2fr .9fr .9fr;gap:18px}
    .copyright{margin-top:18px;padding-top:14px;border-top:1px solid #dfd4fb;font-size:13px;color:#566}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:30;display:grid;gap:10px
    }
    .float-btn{
      width:52px;height:52px;border-radius:16px;border:none;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;box-shadow:0 16px 28px rgba(107,78,255,.25);cursor:pointer
    }
    .kefu{
      position:fixed;left:16px;bottom:16px;z-index:30;width:min(300px,calc(100vw - 32px));
      background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:14px
    }
    .kefu-top{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
    .kefu img{width:100%;border-radius:14px}
    .fade-in{opacity:0;transform:translateY(14px);transition:opacity .55s ease, transform .55s ease}
    .fade-in.visible{opacity:1;transform:none}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.form-grid,.footer-grid,.grid-4,.grid-3{grid-template-columns:1fr 1fr}
      .hero-highlights{grid-template-columns:1fr}
    }
    @media (max-width: 720px){
      .nav-links,.nav-actions .btn-ghost{display:none}
      .menu-toggle{display:inline-flex}
      .mobile-only{display:block}
      .hero-grid,.form-grid,.footer-grid,.grid-4,.grid-3{grid-template-columns:1fr}
      .hero-copy,.hero-panel,.section-card{padding:18px}
      .section-head{flex-direction:column;align-items:flex-start}
      .timeline-item{grid-template-columns:1fr}
      .field-row{grid-template-columns:1fr}
      .kefu{display:none}
      .floating{right:12px;bottom:12px}
      .mobile-menu{display:none;padding:0 0 14px}
      .mobile-menu.open{display:block}
      .mobile-menu a{display:block;padding:10px 0;border-top:1px solid rgba(231,224,255,.8)}
    }