:root{
      --bg:#f7f9fc;
      --bg2:#eef4ff;
      --card:#ffffff;
      --line:#dde6f2;
      --text:#16304d;
      --muted:#5d7187;
      --brand:#1f66ff;
      --brand2:#39c6ff;
      --accent:#ff8a3d;
      --success:#15a36d;
      --shadow:0 18px 45px rgba(24,55,99,.10);
      --shadow2:0 10px 24px rgba(31,102,255,.14);
      --radius:22px;
      --radius2:16px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:
      radial-gradient(circle at top left, rgba(31,102,255,.10), transparent 28%),
      radial-gradient(circle at 85% 10%, rgba(57,198,255,.12), transparent 24%),
      linear-gradient(180deg, #fff 0%, var(--bg) 28%, #f9fbff 100%);
      color:var(--text);line-height:1.7}
    a{color:var(--brand);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:50;background:rgba(255,255,255,.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(221,230,242,.9)}
    .nav{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:4px;box-shadow:0 10px 20px rgba(31,102,255,.10)}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:1.02rem;letter-spacing:.04em}
    .brand-text span{display:block;color:var(--muted);font-size:.85rem}
    .nav-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
    .nav-links a{color:var(--text);font-size:.95rem}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:999px;padding:11px 16px;font-weight:700;transition:.25s ease;cursor:pointer;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#5a7dff);color:#fff;box-shadow:var(--shadow2)}
    .btn-primary:hover,.btn-outline:hover{transform:translateY(-2px)}
    .btn-outline{background:#fff;color:var(--brand);border-color:#cfe0ff}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;color:var(--text)}
    .hero{padding:34px 0 18px;position:relative;overflow:hidden}
    .hero-grid{display:grid;grid-template-columns:1.22fr .78fr;gap:22px;align-items:stretch}
    .hero-copy,.hero-panel,.card,.section-card,.faq-item,.review-card,.article-card,.quote-card,.form-card,.price-card,.timeline-card{background:var(--card);border:1px solid rgba(221,230,242,.9);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-copy{padding:30px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,rgba(31,102,255,.11),rgba(57,198,255,.14));color:var(--brand);border:1px solid rgba(31,102,255,.12);padding:8px 12px;border-radius:999px;font-weight:700;font-size:.9rem}
    h1{margin:16px 0 14px;font-size:clamp(2rem,4vw,3.6rem);line-height:1.08;letter-spacing:-.03em}
    .lead{margin:0;color:var(--muted);font-size:1.04rem;max-width:58ch}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0 18px}
    .hero-points{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:20px}
    .mini{padding:14px 15px;border-radius:18px;background:linear-gradient(180deg,#fff,#f8fbff);border:1px solid #e5eefb}
    .mini strong{display:block;font-size:1rem}
    .mini span{color:var(--muted);font-size:.92rem}
    .hero-panel{padding:18px;position:relative}
    .stat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .stat{padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff 0%,#f6f9ff 100%);border:1px solid #e5eefb}
    .stat b{display:block;font-size:1.55rem;color:var(--brand);line-height:1}
    .stat span{display:block;margin-top:8px;color:var(--muted);font-size:.92rem}
    .hero-panel .home-link{display:inline-flex;margin-top:14px}
    .section{padding:14px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:14px;margin-bottom:14px}
    .section-head h2{margin:0;font-size:1.55rem}
    .section-head p{margin:0;color:var(--muted);max-width:60ch}
    .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}
    .card,.section-card,.review-card,.article-card,.faq-item,.price-card,.timeline-card{padding:20px}
    .icon{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(31,102,255,.12),rgba(57,198,255,.18));color:var(--brand);font-weight:900;margin-bottom:12px}
    .card h3,.section-card h3,.price-card h3,.review-card h3,.article-card h3{margin:0 0 10px;font-size:1.08rem}
    .card p,.section-card p,.review-card p,.article-card p,.price-card p{margin:0;color:var(--muted)}
    .tag-cloud{display:flex;gap:10px;flex-wrap:wrap}
    .tag{padding:8px 11px;border:1px solid #dbe6f6;border-radius:999px;background:#fff;color:var(--text);font-size:.9rem}
    .table-wrap{overflow:auto;border-radius:20px;border:1px solid #dbe6f6;background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:780px}
    th,td{padding:14px 16px;border-bottom:1px solid #edf2f7;text-align:left;vertical-align:top}
    th{background:#f5f8ff;color:var(--text)}
    .rating{display:flex;align-items:center;gap:8px;font-weight:800;color:#0f5bd8}
    .stars{color:#ffb400;letter-spacing:.08em}
    .flow{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step{padding:18px;border-radius:20px;background:linear-gradient(180deg,#fff 0%,#f7fbff 100%);border:1px solid #e2ecfb;position:relative}
    .step .num{display:inline-flex;width:34px;height:34px;border-radius:50%;align-items:center;justify-content:center;background:var(--brand);color:#fff;font-weight:800;margin-bottom:12px}
    .columns{display:grid;grid-template-columns:1.05fr .95fr;gap:16px;align-items:start}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:grid;grid-template-columns:92px 1fr;gap:12px;padding:14px 0;border-bottom:1px dashed #dbe6f6}
    .timeline-item:last-child{border-bottom:none;padding-bottom:0}
    .timeline-item b{color:var(--brand)}
    .faq{display:grid;gap:12px}
    .faq-item{padding:0;overflow:hidden}
    .faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 20px;background:#fff;border:0;color:var(--text);font-size:1rem;font-weight:700;text-align:left;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 20px}
    .faq-item.open .faq-a{max-height:180px;padding-bottom:18px}
    .reviews,.articles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .quote{font-size:1.02rem;color:var(--text);margin-bottom:12px}
    .meta{color:var(--muted);font-size:.92rem}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .field{display:grid;gap:8px}
    label{font-weight:700;font-size:.95rem}
    input,select,textarea{width:100%;border:1px solid #d9e4f2;background:#fff;border-radius:14px;padding:13px 14px;font:inherit;color:var(--text);outline:none;transition:border-color .2s,box-shadow .2s}
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#8cb5ff;box-shadow:0 0 0 4px rgba(31,102,255,.10)}
    .full{grid-column:1 / -1}
    .form-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
    .footer{margin-top:16px;padding:24px 0 30px;background:linear-gradient(180deg,#eef4ff 0%,#e9f0ff 100%);border-top:1px solid #dbe6f6;color:#14304d}
    .footer a{color:#0f5bd8}
    .footer-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:18px}
    .footer small{color:#496179}
    .fixed-tools{position:fixed;right:14px;bottom:16px;display:grid;gap:10px;z-index:60}
    .tool{width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,var(--brand),#68a1ff);color:#fff;display:grid;place-items:center;box-shadow:var(--shadow2);border:0;cursor:pointer}
    .mobile-only{display:none}
    .scroll-reveal{opacity:0;transform:translateY(14px);transition:.55s ease}
    .scroll-reveal.show{opacity:1;transform:none}
    .gallery{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .gallery img{width:100%;border-radius:18px;border:1px solid #e3ecf8;box-shadow:var(--shadow);object-fit:cover}
    .note{background:linear-gradient(135deg,rgba(31,102,255,.08),rgba(255,138,61,.08));border:1px solid #dbe6f6;border-radius:18px;padding:16px;color:var(--muted)}
    @media (max-width: 1024px){
      .hero-grid,.columns,.footer-grid,.reviews,.articles,.grid-4,.gallery,.flow{grid-template-columns:repeat(2,minmax(0,1fr))}
      .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
      .hero-copy{padding:24px}
    }
    @media (max-width: 760px){
      .nav-links,.nav-actions .btn-outline{display:none}
      .menu-toggle,.mobile-only{display:inline-flex}
      .hero-grid,.columns,.footer-grid,.reviews,.articles,.grid-4,.gallery,.flow,.grid-3,.stat-grid,.hero-points,.form-grid{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .nav{padding:12px 0}
      .hero{padding-top:18px}
      h1{font-size:2rem}
      .fixed-tools{right:12px;bottom:12px}
      .faq-item.open .faq-a{max-height:260px}
      .timeline-item{grid-template-columns:1fr}
      .hero-actions .btn{width:100%}
    }