:root{
      --bg:#f5f7fb;
      --bg2:#eef4ff;
      --card:#ffffff;
      --text:#172033;
      --muted:#5d6b86;
      --line:#dbe4f3;
      --brand:#2563eb;
      --brand2:#0ea5e9;
      --accent:#22c55e;
      --shadow:0 18px 50px rgba(31, 56, 120, .10);
      --shadow2:0 10px 30px rgba(37, 99, 235, .12);
      --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;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(37,99,235,.12), transparent 28%),
        radial-gradient(circle at 85% 15%, rgba(14,165,233,.10), transparent 24%),
        linear-gradient(180deg, #f9fbff 0%, #f4f7fc 38%, #f7f9fd 100%);
      line-height:1.65;
      overflow-x:hidden;
    }
    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;
      backdrop-filter:saturate(1.2) blur(14px);
      background:rgba(249,251,255,.82);
      border-bottom:1px solid rgba(219,228,243,.9);
    }
    .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:6px; box-shadow:0 8px 22px rgba(0,0,0,.06)}
    .brand strong{display:block; font-size:1.02rem; letter-spacing:.5px}
    .brand span{display:block; color:var(--muted); font-size:.82rem}
    .menu-toggle{
      display:none; border:1px solid var(--line); background:#fff; color:var(--text);
      border-radius:12px; padding:10px 12px; font-size:.95rem;
    }
    .nav-links{display:flex; align-items:center; gap:16px; flex-wrap:wrap; justify-content:flex-end}
    .nav-links a{color:var(--text); font-size:.95rem; padding:8px 10px; border-radius:10px}
    .nav-links a:hover{background:#eef4ff; color:var(--brand)}
    .nav-cta{
      display:inline-flex; align-items:center; justify-content:center; gap:8px;
      padding:10px 16px; border-radius:999px; background:linear-gradient(135deg, var(--brand), var(--brand2));
      color:#fff; box-shadow:var(--shadow2); font-weight:600;
    }
    .hero{
      position:relative;
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid; grid-template-columns:1.25fr .75fr; gap:24px; align-items:stretch;
    }
    .hero-main, .hero-side, .section-card, .service-card, .metric, .review-card, .article-card, .faq-item, .contact-card, .price-box, .timeline, .compare-box{
      background:rgba(255,255,255,.92);
      border:1px solid rgba(219,228,243,.92);
      border-radius:var(--radius2);
      box-shadow:var(--shadow);
    }
    .hero-main{padding:34px}
    .kicker{
      display:inline-flex; align-items:center; gap:8px; padding:8px 14px;
      background:#eef5ff; color:#2251c6; border-radius:999px; font-size:.92rem; font-weight:600;
    }
    h1{
      margin:18px 0 14px; font-size:clamp(2rem, 5vw, 3.7rem); line-height:1.08; letter-spacing:-.02em;
    }
    .lead{font-size:1.05rem; color:var(--muted); max-width:62ch; margin:0 0 22px}
    .hero-actions{display:flex; gap:12px; flex-wrap:wrap; margin:22px 0 18px}
    .btn{
      display:inline-flex; align-items:center; justify-content:center; gap:8px;
      padding:13px 18px; border-radius:14px; border:1px solid transparent;
      font-weight:700; transition:.22s ease; cursor:pointer;
    }
    .btn-primary{background:linear-gradient(135deg, var(--brand), var(--brand2)); color:#fff; box-shadow:var(--shadow2)}
    .btn-ghost{background:#fff; color:var(--text); border-color:var(--line)}
    .btn:hover{transform:translateY(-2px)}
    .hero-points{
      display:grid; grid-template-columns:repeat(3,1fr); gap:12px; margin-top:18px;
    }
    .point{
      padding:14px; border-radius:16px; background:linear-gradient(180deg,#f8fbff,#f3f7ff); border:1px solid #dfe8fb;
    }
    .point b{display:block; font-size:1.08rem; margin-bottom:4px}
    .point span{display:block; font-size:.9rem; color:var(--muted)}
    .hero-side{padding:24px; display:flex; flex-direction:column; gap:14px; justify-content:space-between}
    .mini-stat{display:grid; grid-template-columns:1fr 1fr; gap:12px}
    .metric{padding:18px; border-radius:18px}
    .metric .num{font-size:1.6rem; font-weight:800; color:#1f4ed8}
    .metric .txt{color:var(--muted); font-size:.92rem}
    .hero-side .note{
      padding:16px; border-radius:18px; background:linear-gradient(135deg, rgba(37,99,235,.08), rgba(34,197,94,.08));
      border:1px solid rgba(37,99,235,.12);
    }
    .section{padding:18px 0}
    .section-head{display:flex; justify-content:space-between; align-items:end; gap:16px; margin:16px 0 14px}
    .section-head h2{margin:0; font-size:clamp(1.4rem, 2.5vw, 2.1rem)}
    .section-head p{margin:0; color:var(--muted); max-width:58ch}
    .section-card{padding:24px}
    .grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .grid-4{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
    .service-card, .review-card, .article-card{padding:18px; transition:.22s ease}
    .service-card:hover, .review-card:hover, .article-card:hover{transform:translateY(-4px); box-shadow:0 20px 36px rgba(31,56,120,.12)}
    .chip-row{display:flex; flex-wrap:wrap; gap:10px}
    .chip{padding:8px 12px; background:#f0f5ff; color:#2446a8; border:1px solid #dbe7ff; border-radius:999px; font-size:.88rem}
    .service-card h3, .article-card h3, .review-card h3{margin:0 0 8px; font-size:1.05rem}
    .service-card p, .article-card p, .review-card p{margin:0; color:var(--muted)}
    .two-col{display:grid; grid-template-columns:1fr 1fr; gap:18px; align-items:start}
    .steps{display:grid; gap:12px}
    .step{display:flex; gap:14px; align-items:flex-start; padding:16px; border-radius:18px; background:#fafcff; border:1px solid var(--line)}
    .step i{
      width:34px; height:34px; border-radius:12px; flex:0 0 auto;
      background:linear-gradient(135deg,var(--brand),var(--brand2)); color:#fff; display:grid; place-items:center; font-style:normal; font-weight:800;
    }
    .table-wrap{overflow:auto; border-radius:18px; border:1px solid var(--line)}
    table{width:100%; border-collapse:collapse; min-width:780px; background:#fff}
    th, td{padding:15px 14px; border-bottom:1px solid var(--line); text-align:left; vertical-align:top}
    th{background:#f3f7ff; color:#17315d; font-size:.95rem}
    .rating{display:flex; align-items:center; gap:10px; flex-wrap:wrap; margin:6px 0 14px}
    .stars{color:#f59e0b; letter-spacing:2px; font-size:1.15rem}
    .quote{
      padding:18px; border-left:4px solid var(--brand); background:linear-gradient(180deg,#fbfdff,#f3f7ff); border-radius:14px;
      color:#31405b;
    }
    .form-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
    .field{display:flex; flex-direction:column; gap:8px}
    .field.full{grid-column:1 / -1}
    label{font-weight:600; font-size:.95rem}
    input, select, textarea{
      width:100%; border:1px solid #cfd9ea; border-radius:14px; padding:13px 14px; font:inherit; background:#fff; color:var(--text);
      outline:none; transition:.2s ease;
    }
    input:focus, select:focus, textarea:focus{border-color:#79a7ff; box-shadow:0 0 0 4px rgba(37,99,235,.10)}
    textarea{min-height:120px; resize:vertical}
    .faq-list{display:grid; gap:12px}
    .faq-item{overflow:hidden}
    .faq-q{
      width:100%; border:none; background:transparent; color:var(--text); text-align:left;
      padding:18px; display:flex; justify-content:space-between; gap:14px; align-items:center; font:inherit; cursor:pointer;
    }
    .faq-q span{font-weight:700}
    .faq-a{max-height:0; overflow:hidden; transition:max-height .28s ease; padding:0 18px}
    .faq-item.open .faq-a{max-height:180px; padding-bottom:18px}
    .faq-a p{margin:0; color:var(--muted)}
    .footer{
      margin-top:18px; background:#0f1b33; color:#dbe6ff; padding:28px 0 22px
    }
    .footer a{color:#8ec5ff}
    .footer .container{display:grid; gap:18px}
    .footer-top{display:grid; grid-template-columns:1.2fr .8fr; gap:18px; align-items:start}
    .footer-box{background:rgba(255,255,255,.05); border:1px solid rgba(255,255,255,.08); border-radius:18px; padding:18px}
    .footer-links{display:flex; flex-wrap:wrap; gap:10px}
    .footer-links a{padding:8px 12px; border-radius:999px; background:rgba(255,255,255,.06)}
    .muted{color:var(--muted)}
    .floating{
      position:fixed; right:16px; bottom:16px; z-index:60; display:grid; gap:10px;
    }
    .floating a, .floating button{
      width:48px; height:48px; border:none; border-radius:16px; background:linear-gradient(135deg,var(--brand),var(--brand2));
      color:#fff; display:grid; place-items:center; box-shadow:var(--shadow2); cursor:pointer;
    }
    .backtop{display:none}
    .tag-cloud{display:flex; flex-wrap:wrap; gap:10px}
    .tag-cloud span{padding:8px 11px; border:1px solid #dbe4f3; background:#fff; border-radius:999px; color:#34445f}
    .timeline{padding:18px}
    .timeline ol{margin:0; padding:0; list-style:none; display:grid; gap:12px}
    .timeline li{display:grid; grid-template-columns:72px 1fr; gap:12px; align-items:start}
    .timeline strong{color:#1f4ed8}
    .article-list{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .small{font-size:.9rem; color:var(--muted)}
    .nav-mobile{display:none}
    @media (max-width: 980px){
      .hero-grid,.two-col,.grid-3,.grid-4,.footer-top,.article-list{grid-template-columns:1fr}
      .hero-points,.mini-stat,.form-grid{grid-template-columns:1fr 1fr}
      .nav-links{display:none}
      .menu-toggle{display:inline-flex}
      .nav-mobile{display:none; padding:0 0 14px}
      .nav-mobile.open{display:grid; gap:8px}
      .nav-mobile a{padding:12px 14px; background:#fff; border:1px solid var(--line); border-radius:14px; color:var(--text)}
      .hero-main{padding:24px}
    }
    @media (max-width: 640px){
      .container{width:min(var(--container), calc(100% - 20px))}
      .hero-points,.mini-stat,.form-grid{grid-template-columns:1fr}
      .section-card,.hero-main,.hero-side{padding:18px}
      .section-head{flex-direction:column; align-items:start}
      .floating{right:12px; bottom:12px}
    }
    .reveal{opacity:0; transform:translateY(18px); transition:.6s ease}
    .reveal.show{opacity:1; transform:none}