:root{
      --bg:#f6f8fc;
      --bg2:#eef3ff;
      --card:#ffffff;
      --text:#172033;
      --muted:#5e6b85;
      --line:#dde5f2;
      --primary:#3b6ef6;
      --primary2:#8d5bff;
      --accent:#12b3a8;
      --warm:#ffb45c;
      --shadow:0 14px 40px rgba(24,41,87,.10);
      --shadow2:0 10px 26px rgba(59,110,246,.16);
      --radius:20px;
      --radius2:28px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;background:linear-gradient(180deg,var(--bg) 0%,#fff 58%,#fbfcff 100%);color:var(--text);line-height:1.65}
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container),calc(100% - 32px));margin:0 auto}
    .topbar{position:sticky;top:0;z-index:60;backdrop-filter:saturate(180%) blur(14px);background:rgba(246,248,252,.82);border-bottom:1px solid rgba(221,229,242,.75)}
    .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:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;padding:5px;box-shadow:0 8px 20px rgba(0,0,0,.06)}
    .brand h2{font-size:18px;margin:0}
    .brand p{margin:2px 0 0;color:var(--muted);font-size:12px}
    .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:.2s}
    .nav-links a:hover,.nav-links a:focus-visible{background:#eaf0ff;color:var(--primary);outline:none}
    .nav-cta{display:flex;align-items:center;gap:10px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:14px;padding:12px 18px;font-weight:700;cursor:pointer;transition:.2s ease;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:var(--shadow2)}
    .btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 34px rgba(59,110,246,.22)}
    .btn-ghost{background:#fff;color:#20304d;border:1px solid var(--line)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px}
    .hero{padding:42px 0 24px;position:relative;overflow:hidden}
    .hero::before,.hero::after{content:"";position:absolute;border-radius:50%;filter:blur(8px);pointer-events:none}
    .hero::before{width:380px;height:380px;background:radial-gradient(circle,rgba(59,110,246,.18),rgba(59,110,246,0));top:-120px;right:-120px}
    .hero::after{width:280px;height:280px;background:radial-gradient(circle,rgba(18,179,168,.16),rgba(18,179,168,0));bottom:-90px;left:-80px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-main,.hero-side,.section-card,.table-card,.form-card,.faq-card,.review-card,.article-card,.pricing-card,.timeline-card,.network-card{background:rgba(255,255,255,.88);border:1px solid rgba(221,229,242,.9);border-radius:var(--radius2);box-shadow:var(--shadow)}
    .hero-main{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#eef4ff;color:#2752d6;border:1px solid #d8e3ff;border-radius:999px;padding:8px 14px;font-size:13px;font-weight:700}
    h1{font-size:clamp(30px,4.8vw,54px);line-height:1.12;margin:16px 0 14px;letter-spacing:-.03em}
    .lead{font-size:16px;color:var(--muted);max-width:58ch;margin:0 0 22px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:18px}
    .hero-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:18px}
    .mini{padding:14px 14px 13px;border-radius:18px;background:linear-gradient(180deg,#fff,#f7faff);border:1px solid var(--line)}
    .mini strong{display:block;font-size:20px;color:#16233b}
    .mini span{display:block;color:var(--muted);font-size:13px;margin-top:4px}
    .hero-side{padding:22px;display:flex;flex-direction:column;gap:14px}
    .stat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .stat{padding:16px;border-radius:18px;background:linear-gradient(135deg,#ffffff,#f5f8ff);border:1px solid var(--line)}
    .stat b{font-size:22px;display:block}
    .stat small{display:block;color:var(--muted);margin-top:5px}
    .side-highlight{padding:18px;border-radius:20px;background:linear-gradient(135deg,#f1f6ff,#eefdfb);border:1px solid #dfeaff}
    .side-highlight h3{margin:0 0 8px;font-size:18px}
    .side-highlight p{margin:0;color:var(--muted)}
    .section{padding:18px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:14px}
    .section-head h2{margin:0;font-size:clamp(22px,3vw,34px)}
    .section-head p{margin:0;color:var(--muted);max-width:68ch}
    .section-card{padding:24px}
    .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,.case,.review,.article,.faq-item,.step,.price,.timeline-item,.network-item{border:1px solid var(--line);border-radius:20px;background:#fff;padding:18px}
    .service h3,.case h3,.review h3,.article h3,.step h3,.price h3,.network-item h3{margin:10px 0 8px;font-size:18px}
    .service p,.case p,.review p,.article p,.step p,.network-item p{margin:0;color:var(--muted)}
    .icon{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#ecf3ff,#eefdfb);color:var(--primary);font-weight:800}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#2c3550;font-size:13px}
    .steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step b{display:inline-flex;width:32px;height:32px;border-radius:10px;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line)}
    table{width:100%;border-collapse:collapse;min-width:760px;background:#fff}
    th,td{padding:14px 14px;border-bottom:1px solid #e9eef7;text-align:left;font-size:14px;vertical-align:top}
    th{background:#f6f9ff;color:#20304d}
    .good{color:#0d7c57;font-weight:700}
    .score-box{display:grid;grid-template-columns:1fr .9fr;gap:16px;align-items:stretch}
    .rating{padding:22px;border-radius:22px;background:linear-gradient(135deg,#f6f8ff,#f1fffb);border:1px solid #dce7ff}
    .stars{font-size:24px;color:#f59f00;letter-spacing:2px}
    .faq-item{padding:0;overflow:hidden}
    .faq-q{width:100%;text-align:left;background:#fff;border:none;padding:18px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:16px;font-weight:700;color:#1c2740;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 18px;color:var(--muted)}
    .faq-item.open .faq-a{max-height:180px;padding-bottom:18px}
    .faq-item.open .faq-icon{transform:rotate(45deg)}
    .faq-icon{transition:.2s}
    .reviews,.articles,.cases,.prices,.network,.timeline,.faq-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .form-card form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    .field.full{grid-column:1 / -1}
    label{font-size:14px;font-weight:700;color:#21304d}
    input,select,textarea{width:100%;border:1px solid #dbe3f1;border-radius:14px;background:#fff;padding:13px 14px;font:inherit;color:var(--text);outline:none;transition:.2s}
    input:focus,select:focus,textarea:focus{border-color:#7da1ff;box-shadow:0 0 0 4px rgba(59,110,246,.10)}
    textarea{min-height:124px;resize:vertical}
    .footer{margin-top:18px;padding:24px 0 32px;border-top:1px solid rgba(221,229,242,.9);background:#f7f9fe;color:#20304d}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr 1fr;gap:18px}
    .footer a{color:#274ed2}
    .footer small,.footer p{color:#56647f}
    .float-box{position:fixed;right:16px;bottom:16px;z-index:70;display:flex;flex-direction:column;gap:10px}
    .float-btn{width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;display:grid;place-items:center;box-shadow:var(--shadow2)}
    .float-panel{position:fixed;right:16px;bottom:78px;width:min(320px,calc(100vw - 32px));background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:16px;display:none;z-index:69}
    .float-panel.show{display:block}
    .kefu{display:grid;grid-template-columns:92px 1fr;gap:14px;align-items:center}
    .kefu img{width:92px;height:92px;object-fit:cover;border-radius:16px;border:1px solid var(--line)}
    .backtop{position:fixed;right:16px;bottom:134px;z-index:70}
    .reveal{opacity:0;transform:translateY(12px);transition:.6s ease}
    .reveal.show{opacity:1;transform:none}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.score-box,.footer-grid,.grid-3,.grid-4,.reviews,.articles,.cases,.prices,.network,.timeline,.faq-list,.steps{grid-template-columns:1fr 1fr}
      .hero-points{grid-template-columns:1fr}
      .form-card form{grid-template-columns:1fr}
    }
    @media (max-width: 720px){
      .nav-links,.nav-cta{display:none}
      .menu-toggle{display:inline-flex}
      .mobile-only{display:block}
      .hero{padding-top:24px}
      .hero-main,.hero-side,.section-card{padding:20px}
      .hero-grid,.score-box,.footer-grid,.grid-3,.grid-4,.reviews,.articles,.cases,.prices,.network,.timeline,.faq-list,.steps{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .topbar.open .nav-links,.topbar.open .nav-cta{display:flex}
      .topbar.open .nav{align-items:flex-start;flex-direction:column}
      .topbar.open .nav-links{justify-content:flex-start;flex-wrap:wrap}
      .topbar.open .nav-cta{padding-top:2px}
      table{min-width:900px}
    }
    .badge{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border-radius:999px;background:#f2f6ff;border:1px solid #dae4ff;color:#3153c9;font-size:12px;font-weight:700}
    .muted{color:var(--muted)}
    .link-row{display:flex;flex-wrap:wrap;gap:10px}
    .link-row a{padding:8px 11px;border-radius:999px;border:1px solid var(--line);background:#fff}