:root{
      --bg:#f6f7fb;
      --card:#ffffff;
      --card-2:#f2f5ff;
      --ink:#172033;
      --muted:#5b6477;
      --line:#e4e8f2;
      --brand:#0f63ff;
      --brand2:#ff4d6d;
      --brand3:#6c3bff;
      --good:#0b8f5b;
      --shadow:0 18px 50px rgba(21,34,66,.10);
      --radius:22px;
      --radius-sm:16px;
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:
      radial-gradient(circle at top left, rgba(15,99,255,.12), transparent 30%),
      radial-gradient(circle at 85% 12%, rgba(255,77,109,.12), transparent 24%),
      linear-gradient(180deg,#f8faff 0%, #f5f7fc 40%, #f7f8fd 100%);
      color:var(--ink);line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max),calc(100% - 32px));margin:0 auto}
    .topbar{position:sticky;top:0;z-index:50;background:rgba(247,249,253,.86);backdrop-filter:blur(14px);border-bottom:1px solid rgba(228,232,242,.8)}
    .nav{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:40px;height:40px;border-radius:12px;object-fit:cover;background:#fff;box-shadow:0 10px 26px rgba(15,99,255,.16)}
    .brand-text strong{display:block;font-size:15px;line-height:1.2}
    .brand-text span{display:block;font-size:12px;color:var(--muted)}
    .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 10px;border-radius:999px;transition:.25s}
    .nav-links a:hover,.nav-links a:focus{background:#edf3ff;color:var(--brand)}
    .nav-cta{display:flex;align-items:center;gap:10px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:12px 18px;font-weight:700;cursor:pointer;transition:.25s;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--brand) 0%, #2ea1ff 100%);color:#fff;box-shadow:0 14px 28px rgba(15,99,255,.24)}
    .btn-primary:hover{transform:translateY(-1px);box-shadow:0 18px 34px rgba(15,99,255,.28)}
    .btn-secondary{background:#fff;color:var(--ink);border:1px solid var(--line)}
    .btn-secondary:hover{border-color:#c7d4fb;transform:translateY(-1px)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);width:44px;height:44px;border-radius:14px}
    .menu-btn span{display:block;width:18px;height:2px;background:#22304a;margin:4px auto;border-radius:99px}
    header.hero{padding:34px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:22px;align-items:stretch}
    .hero-copy{background:linear-gradient(180deg,rgba(15,99,255,.08),rgba(255,255,255,.88));border:1px solid rgba(15,99,255,.12);border-radius:30px;padding:34px;box-shadow:var(--shadow);position:relative;overflow:hidden}
    .hero-copy::before,.hero-copy::after{content:"";position:absolute;border-radius:50%}
    .hero-copy::before{width:240px;height:240px;background:radial-gradient(circle,rgba(108,59,255,.22),transparent 65%);right:-88px;top:-60px}
    .hero-copy::after{width:170px;height:170px;background:radial-gradient(circle,rgba(255,77,109,.16),transparent 68%);right:34px;bottom:-70px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#eef4ff;color:#2952cf;font-size:13px;font-weight:700}
    h1{margin:18px 0 12px;font-size:clamp(30px,4vw,52px);line-height:1.08;letter-spacing:-.02em}
    .lead{font-size:17px;color:#344156;max-width:58ch;margin:0 0 22px}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:22px}
    .hero-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:14px}
    .point{background:rgba(255,255,255,.86);border:1px solid #e7ebf5;border-radius:18px;padding:16px}
    .point strong{display:block;font-size:15px;margin-bottom:6px}
    .point span{color:var(--muted);font-size:13px}
    .hero-aside{display:grid;gap:14px}
    .metric-card,.intro-card,.eval-card,.form-card,.review-card,.case-card,.info-card,.compare-card,.faq-card,.price-card,.network-card,.timeline-card,.tag-card,.service-card,.article-card,.about-card{background:rgba(255,255,255,.92);border:1px solid rgba(228,232,242,.95);border-radius:var(--radius);box-shadow:var(--shadow)}
    .metric-card{padding:20px}
    .metrics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .metric{padding:16px;border-radius:18px;background:linear-gradient(180deg,#fff,#f7f9ff);border:1px solid #e9edf7}
    .metric b{display:block;font-size:24px;line-height:1.1}
    .metric span{font-size:13px;color:var(--muted)}
    .hero-image-stack{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .hero-image-stack .ai-page-image{border-radius:20px;border:1px solid #e6eaf5;box-shadow:0 14px 28px rgba(27,38,70,.08)}
    section{padding:20px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:28px;line-height:1.15}
    .section-head p{margin:0;color:var(--muted);max-width:62ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .service-card,.about-card,.case-card,.review-card,.article-card,.info-card,.compare-card,.faq-card,.price-card,.network-card,.timeline-card,.tag-card,.eval-card,.form-card{padding:22px}
    .service-card h3,.about-card h3,.case-card h3,.review-card h3,.article-card h3,.info-card h3,.compare-card h3,.faq-card h3,.price-card h3,.network-card h3,.timeline-card h3,.tag-card h3,.eval-card h3,.form-card h3{margin:0 0 10px;font-size:18px}
    .service-card p,.about-card p,.case-card p,.review-card p,.article-card p,.info-card p,.compare-card p,.faq-card p,.price-card p,.network-card p,.timeline-card p,.tag-card p,.eval-card p,.form-card p{margin:0;color:var(--muted)}
    .chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
    .chip{padding:9px 12px;border-radius:999px;background:#f2f6ff;border:1px solid #dde6fb;font-size:13px;color:#26406f}
    .step-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step{position:relative;padding:20px;border-radius:20px;background:linear-gradient(180deg,#fff,#f6f8ff);border:1px solid #e6ebf6}
    .step .num{display:inline-flex;width:34px;height:34px;align-items:center;justify-content:center;border-radius:11px;background:linear-gradient(135deg,var(--brand3),var(--brand));color:#fff;font-weight:800;margin-bottom:12px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid #e5e9f2}
    table{width:100%;border-collapse:collapse;min-width:820px;background:#fff}
    th,td{padding:16px 14px;border-bottom:1px solid #edf1f7;text-align:left;vertical-align:top;font-size:14px}
    th{background:#f5f8ff;color:#22314b;font-size:13px;letter-spacing:.02em}
    tr:hover td{background:#fbfcff}
    .rating{display:flex;align-items:center;gap:8px;font-weight:800;color:#24304a}
    .stars{color:#ffb400;letter-spacing:2px}
    .faq-list{display:grid;gap:12px}
    details{border:1px solid #e7ebf4;border-radius:18px;background:#fff;overflow:hidden}
    summary{list-style:none;padding:16px 18px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:12px}
    summary::-webkit-details-marker{display:none}
    details p{padding:0 18px 18px;margin:0;color:var(--muted)}
    .reviews{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .review-card .meta{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
    .review-card .role{font-size:13px;color:#5d6780}
    .review-card .quote{font-size:14px;color:#334156}
    .case-list,.article-list,.tag-cloud,.network-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .case-card .badge,.article-card .badge,.price-card .badge{display:inline-flex;padding:7px 10px;border-radius:999px;background:#ecf4ff;color:#2151c4;font-size:12px;font-weight:700;margin-bottom:12px}
    .price-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .price-card strong{font-size:30px;display:block;margin:8px 0;color:#172033}
    .timeline{display:grid;gap:14px}
    .timeline-item{display:flex;gap:14px;align-items:flex-start;padding:16px;border-radius:18px;background:#fff;border:1px solid #e8ecf6}
    .dot{width:12px;height:12px;border-radius:50%;background:linear-gradient(135deg,var(--brand2),var(--brand));margin-top:7px;flex:0 0 auto;box-shadow:0 0 0 6px rgba(15,99,255,.08)}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    label{display:block;font-size:13px;font-weight:700;margin:0 0 8px;color:#2a3447}
    input,select,textarea{width:100%;border:1px solid #dce3f1;background:#fff;border-radius:14px;padding:13px 14px;font:inherit;color:var(--ink);outline:none;transition:.2s}
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#86aefb;box-shadow:0 0 0 4px rgba(15,99,255,.10)}
    .form-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px}
    footer{padding:18px 0 30px;margin-top:8px;background:#0d1730;color:#d9e2ff}
    footer a{color:#ffffff}
    .footer-grid{display:grid;grid-template-columns:1.3fr .9fr .9fr;gap:18px;align-items:start}
    .footer-card{padding:18px;border-radius:18px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.10)}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a{padding:7px 10px;border-radius:999px;background:rgba(255,255,255,.08)}
    .copyright{margin-top:16px;padding-top:16px;border-top:1px solid rgba(255,255,255,.10);display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;font-size:13px;color:#b8c6ee}
    .floating{position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px}
    .float-btn{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,var(--brand2),var(--brand));color:#fff;box-shadow:0 14px 30px rgba(15,99,255,.22)}
    .float-panel{display:none;position:absolute;right:0;bottom:60px;width:min(280px,calc(100vw - 32px));background:#fff;border:1px solid #e6eaf4;border-radius:18px;box-shadow:var(--shadow);padding:14px}
    .float-panel img{width:100%;border-radius:14px;border:1px solid #edf1f7}
    .float-panel.show{display:block}
    .backtop{position:fixed;left:16px;bottom:16px;z-index:60}
    .backtop button{width:48px;height:48px;border:0;border-radius:16px;background:#fff;border:1px solid #e2e7f2;box-shadow:var(--shadow)}
    .reveal{opacity:0;transform:translateY(14px);transition:.6s ease}
    .reveal.show{opacity:1;transform:none}
    .small{font-size:13px;color:var(--muted)}
    .inline-list{display:grid;gap:8px;margin:12px 0 0;padding:0;list-style:none}
    .inline-list li{position:relative;padding-left:18px;color:#344156;font-size:14px}
    .inline-list li::before{content:"";position:absolute;left:0;top:10px;width:7px;height:7px;border-radius:50%;background:linear-gradient(135deg,var(--brand2),var(--brand))}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-4,.reviews,.case-list,.article-list,.tag-cloud,.network-grid,.price-grid,.footer-grid,.step-list{grid-template-columns:1fr 1fr}
      .hero-copy{padding:26px}
      .section-head{align-items:flex-start;flex-direction:column}
    }
    @media (max-width: 760px){
      .nav-links,.nav-cta{display:none}
      .menu-btn{display:inline-grid;place-items:center}
      .nav.open .nav-links,.nav.open .nav-cta{display:flex}
      .nav.open{align-items:flex-start;flex-direction:column}
      .nav.open .nav-links{width:100%;justify-content:flex-start}
      .nav.open .nav-cta{width:100%}
      .hero-grid,.grid-3,.grid-4,.reviews,.case-list,.article-list,.tag-cloud,.network-grid,.price-grid,.footer-grid,.step-list,.hero-points,.metrics,.form-grid{grid-template-columns:1fr}
      .hero-copy{padding:22px;border-radius:24px}
      h1{font-size:clamp(28px,9vw,40px)}
      .lead{font-size:15px}
      .floating{right:12px;bottom:12px}
      .backtop{left:12px;bottom:12px}
      table{min-width:700px}
    }