:root{
      --bg:#f7f4ef;
      --bg2:#eef5ff;
      --card:#ffffff;
      --text:#172033;
      --muted:#5f6b84;
      --line:#dbe3ef;
      --primary:#2457ff;
      --primary2:#7c3aed;
      --accent:#14b8a6;
      --warm:#ffb86b;
      --shadow:0 18px 50px rgba(18, 34, 66, .10);
      --radius:20px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:
      radial-gradient(circle at top left, rgba(124,58,237,.10), transparent 28%),
      radial-gradient(circle at 85% 10%, rgba(36,87,255,.10), transparent 25%),
      linear-gradient(180deg,var(--bg),#fff 42%, #f6f8fc 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px));margin:0 auto}
    header{position:sticky;top:0;z-index:40;background:rgba(247,244,239,.88);backdrop-filter:blur(14px);border-bottom:1px solid rgba(219,227,239,.8)}
    .topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;padding:6px;box-shadow:0 8px 24px rgba(18,34,66,.08)}
    .brand-text strong{display:block;font-size:18px;letter-spacing:.5px}
    .brand-text span{display:block;font-size:12px;color:var(--muted);margin-top:2px}
    nav{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    nav a{font-size:14px;color:#24314a;padding:8px 10px;border-radius:999px;transition:.25s ease}
    nav a:hover,nav a.active{background:#fff;color:var(--primary);box-shadow:0 8px 24px rgba(36,87,255,.10)}
    .nav-tools{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:13px 18px;font-weight:700;cursor:pointer;transition:.25s ease;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 14px 34px rgba(36,87,255,.24)}
    .btn-light{background:#fff;color:var(--text);border:1px solid var(--line)}
    .btn:hover{transform:translateY(-1px)}
    .menu-btn{display:none}
    main{display:block}
    section{padding:68px 0}
    .hero{padding:52px 0 46px}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;align-items:stretch}
    .hero-copy,.panel,.card,.faq-item,.review,.article,.metric,.compare,.formbox,.timeline li,.price-box,.tag-box{background:rgba(255,255,255,.82);border:1px solid rgba(219,227,239,.95);box-shadow:var(--shadow);border-radius:var(--radius)}
    .hero-copy{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:linear-gradient(135deg,rgba(36,87,255,.10),rgba(124,58,237,.10));color:var(--primary);font-weight:700;font-size:13px}
    h1{font-size:clamp(30px,5vw,54px);line-height:1.08;margin:16px 0 14px;letter-spacing:-.03em}
    .hero p{color:var(--muted);line-height:1.8;font-size:16px;margin:0}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
    .hero-highlights{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .mini{padding:14px;border-radius:16px;background:linear-gradient(180deg,#fff,#f8fbff);border:1px solid var(--line)}
    .mini b{display:block;font-size:18px}
    .mini span{display:block;color:var(--muted);font-size:13px;margin-top:4px}
    .hero-side{display:grid;gap:16px}
    .panel{padding:22px}
    .panel h2,.section-title h2{font-size:28px;margin:0 0 10px}
    .section-title p{margin:0;color:var(--muted);line-height:1.8}
    .chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
    .chip{padding:9px 12px;border-radius:999px;background:#f4f7ff;border:1px solid #dde6ff;font-size:13px;color:#28406f}
    .metrics,.cards,.reviews,.articles,.grid2,.grid3,.grid4{display:grid;gap:18px}
    .metrics{grid-template-columns:repeat(4,1fr)}
    .metric{padding:20px}
    .metric strong{display:block;font-size:30px;margin-bottom:8px}
    .metric span{color:var(--muted);font-size:14px}
    .cards{grid-template-columns:repeat(3,1fr)}
    .card{padding:22px;transition:.25s ease}
    .card:hover,.review:hover,.article:hover,.faq-item:hover,.timeline li:hover,.price-box:hover{transform:translateY(-3px)}
    .card h3,.review h3,.article h3,.formbox h3{margin:0 0 10px;font-size:18px}
    .card p,.review p,.article p,.formbox p{margin:0;color:var(--muted);line-height:1.75}
    .card .tag{display:inline-block;margin-bottom:14px;padding:6px 10px;border-radius:999px;background:rgba(20,184,166,.10);color:#0f766e;font-size:12px;font-weight:700}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
    .list{display:grid;gap:12px;margin:16px 0 0;padding:0;list-style:none}
    .list li{display:flex;gap:10px;align-items:flex-start;color:#24314a;line-height:1.7}
    .list li::before{content:"";width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));margin-top:8px;flex:0 0 auto}
    .flow{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step{padding:20px}
    .step .num{display:inline-flex;width:34px;height:34px;border-radius:50%;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;font-weight:800;margin-bottom:14px}
    .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;text-align:left;border-bottom:1px solid #edf1f7;vertical-align:top}
    th{background:#f8fbff;color:#20304a}
    td{color:#314058}
    .badge-star{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:999px;background:linear-gradient(135deg,#fff7e8,#fff);border:1px solid #fde1b4;color:#9a5b00;font-weight:700}
    .faq{display:grid;gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{width:100%;padding:18px 20px;background:transparent;border:0;display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:16px;font-weight:700;color:#1c2940;cursor:pointer;text-align:left}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease;padding:0 20px}
    .faq-item.open .faq-a{max-height:220px;padding-bottom:18px}
    .faq-item.open .icon{transform:rotate(45deg)}
    .reviews,.articles{grid-template-columns:repeat(3,1fr)}
    .review,.article{padding:22px}
    .quote{font-size:42px;line-height:1;color:rgba(36,87,255,.18);margin-bottom:8px}
    .meta{font-size:13px;color:var(--muted);margin-top:14px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud a,.tag-cloud span{padding:10px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#2d3b56;font-size:13px}
    .timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;list-style:none;padding:0;margin:0}
    .timeline li{padding:20px}
    .timeline strong{display:block;margin-bottom:8px}
    .price-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:18px}
    .price-box{padding:22px}
    .price-box .price{font-size:34px;font-weight:800;margin:10px 0;color:#14306a}
    .formbox{padding:24px}
    form{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin-top:16px}
    .full{grid-column:1/-1}
    input,select,textarea{width:100%;border:1px solid #d7e0ef;background:#fff;color:var(--text);border-radius:14px;padding:14px 15px;font:inherit;outline:none;transition:.2s ease}
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(36,87,255,.10)}
    footer{padding:28px 0 34px;border-top:1px solid var(--line);background:#f7f9fd;color:#24314a}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:20px;align-items:start}
    .footer-links{display:flex;flex-wrap:wrap;gap:12px;margin-top:10px}
    .footer-links a{color:#38507f}
    .floating{position:fixed;right:18px;bottom:18px;z-index:50;display:grid;gap:10px}
    .float-btn{display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 16px 32px rgba(36,87,255,.28)}
    .ai-page-image{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)}
    .media-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .scroll-top{opacity:0;pointer-events:none;transform:translateY(6px);transition:.25s ease}
    .scroll-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
    .fade-in{opacity:0;transform:translateY(12px);transition:.5s ease}
    .fade-in.visible{opacity:1;transform:none}
    .mobile-menu{display:none}
    @media (max-width: 980px){
      .hero-grid,.split,.metrics,.cards,.flow,.reviews,.articles,.timeline,.price-grid,.footer-grid{grid-template-columns:1fr}
      nav{display:none}
      .menu-btn{display:inline-flex}
      .mobile-menu{display:none;padding:0 0 16px}
      .mobile-menu.open{display:grid;gap:8px}
      .mobile-menu a{padding:12px 14px;border-radius:14px;background:#fff;border:1px solid var(--line)}
      .hero-highlights{grid-template-columns:1fr}
      form{grid-template-columns:1fr}
      .media-grid{grid-template-columns:1fr}
    }