:root{
      --bg:#f6f8fc;
      --bg2:#eef4ff;
      --card:#ffffff;
      --text:#1d2635;
      --muted:#61708a;
      --line:#dbe4f1;
      --brand:#2f6bff;
      --brand2:#7b5cff;
      --accent:#16b8a6;
      --warm:#ffb545;
      --shadow:0 18px 45px rgba(23, 44, 91, .10);
      --shadow2:0 10px 25px rgba(47, 107, 255, .14);
      --radius:20px;
      --radius2:26px;
      --max: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 10% 10%, rgba(47,107,255,.10), transparent 22%),
        radial-gradient(circle at 90% 0%, rgba(123,92,255,.12), transparent 24%),
        linear-gradient(180deg, #fff 0%, var(--bg) 35%, #f9fbff 100%);
      line-height:1.65;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%;height:auto}
    .container{width:min(100% - 32px, var(--max));margin:0 auto}
    .site-header{
      position:sticky;top:0;z-index:50;
      backdrop-filter: blur(12px);
      background:rgba(246,248,252,.82);
      border-bottom:1px solid rgba(219,228,241,.8);
    }
    .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 6px 18px rgba(0,0,0,.08)}
    .brand strong{display:block;font-size:18px;line-height:1.1}
    .brand span{display:block;font-size:12px;color:var(--muted)}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#31405a;padding:8px 10px;border-radius:999px;transition:.25s}
    .nav-links a:hover{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:1px solid transparent;border-radius:999px;
      padding:12px 18px;font-weight:700;font-size:14px;
      transition:.25s ease;cursor:pointer;white-space:nowrap;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:var(--shadow2)}
    .btn-primary:hover{transform:translateY(-2px);filter:saturate(1.05)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-ghost:hover{border-color:#b7c8ec;transform:translateY(-1px)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px}
    .hero{
      padding:42px 0 22px;
      position:relative;overflow:hidden;
    }
    .hero::before,.hero::after{
      content:"";position:absolute;border-radius:50%;filter:blur(10px);pointer-events:none;
    }
    .hero::before{width:260px;height:260px;background:rgba(47,107,255,.12);right:-80px;top:18px}
    .hero::after{width:200px;height:200px;background:rgba(22,184,166,.12);left:-70px;bottom:10px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch}
    .hero-copy,.hero-side,.panel,.card,.faq-item,.review,.article,.form-wrap,.table-wrap,.compare,.timeline,.tags,.pricing{
      background:rgba(255,255,255,.88);border:1px solid rgba(219,228,241,.9);box-shadow:var(--shadow);border-radius:var(--radius2);
    }
    .hero-copy{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#eef4ff;color:#325fd6;border:1px solid #d6e4ff;padding:7px 12px;border-radius:999px;font-size:13px;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(30px,5vw,52px);line-height:1.08;letter-spacing:-.02em}
    .lead{font-size:17px;color:var(--muted);max-width:44em}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 18px}
    .mini-note{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
    .chip{padding:9px 12px;border-radius:999px;background:#f4f7fd;border:1px solid #e1e8f4;color:#45556f;font-size:13px}
    .hero-side{padding:24px;display:flex;flex-direction:column;gap:14px;background:linear-gradient(180deg,#fff 0%,#f8fbff 100%)}
    .stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .stat{padding:16px;border-radius:18px;background:linear-gradient(180deg,#f8fbff 0%,#ffffff 100%);border:1px solid #e2ebf8}
    .stat strong{display:block;font-size:24px;color:#0f234b}
    .stat span{font-size:13px;color:var(--muted)}
    .panel{padding:18px}
    .panel h3,.section-head h2{margin:0 0 10px}
    .section{padding:20px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:14px;margin-bottom:16px}
    .section-head p{margin:0;color:var(--muted);max-width:64ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .card{padding:20px;transition:.25s ease}
    .card:hover,.review:hover,.article:hover{transform:translateY(-3px);box-shadow:0 20px 40px rgba(23,44,91,.12)}
    .icon{
      width:42px;height:42px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,rgba(47,107,255,.12),rgba(123,92,255,.14));color:var(--brand);font-weight:900;margin-bottom:12px
    }
    .card h3{margin:0 0 8px;font-size:18px}
    .card p{margin:0;color:var(--muted)}
    .two-col{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:start}
    .timeline{padding:20px}
    .step{display:grid;grid-template-columns:auto 1fr;gap:14px;padding:14px 0;border-bottom:1px solid #edf2f7}
    .step:last-child{border-bottom:0;padding-bottom:0}
    .step-badge{width:34px;height:34px;border-radius:12px;background:#edf3ff;color:#315fd6;display:grid;place-items:center;font-weight:800}
    .step h4{margin:0 0 4px}
    .step p{margin:0;color:var(--muted);font-size:14px}
    .table-wrap{overflow:auto}
    table{width:100%;border-collapse:separate;border-spacing:0;min-width:760px}
    th,td{padding:14px 12px;border-bottom:1px solid #edf2f7;text-align:left;vertical-align:top;font-size:14px}
    th{background:#f7faff;color:#24314a;font-size:13px}
    .highlight{color:#1c52d8;font-weight:700}
    .compare{padding:20px}
    .rating{display:flex;align-items:center;gap:8px;margin-top:6px;color:#f59e0b;font-weight:800}
    .rating small{color:var(--muted);font-weight:600}
    .progress{height:10px;background:#edf2fb;border-radius:999px;overflow:hidden;margin:10px 0 6px}
    .progress span{display:block;height:100%;width:99%;background:linear-gradient(90deg,var(--brand),var(--accent))}
    .tags{padding:18px}
    .tag-list{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:10px 12px;border-radius:999px;background:#f3f7ff;border:1px solid #dee8fb;color:#394963;font-size:13px}
    .pricing{padding:20px}
    .price-list{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .price-item{border:1px solid #e1e8f5;border-radius:18px;padding:16px;background:linear-gradient(180deg,#fff,#f8fbff)}
    .price-item strong{display:block;font-size:22px;color:#0f234b}
    .price-item span{color:var(--muted);font-size:13px}
    .reviews,.articles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review,.article,.faq-item{padding:18px}
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
    .avatar{width:42px;height:42px;border-radius:50%;background:linear-gradient(135deg,#dfeaff,#eef1ff);display:grid;place-items:center;font-weight:800;color:#315fd6}
    .review h4{margin:0}
    .review p,.article p{margin:0;color:var(--muted)}
    .article .date{font-size:13px;color:#7b879b;margin-top:10px}
    .faq-item{margin-bottom:12px}
    .faq-q{display:flex;align-items:center;justify-content:space-between;gap:12px;cursor:pointer}
    .faq-q h3{margin:0;font-size:16px}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease}
    .faq-item.active .faq-a{max-height:220px}
    .faq-a p{margin:12px 0 0;color:var(--muted)}
    .form-wrap{padding:20px}
    form{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    .full{grid-column:1/-1}
    label{display:block;font-size:14px;font-weight:700;margin-bottom:8px;color:#32415b}
    input,select,textarea{
      width:100%;padding:13px 14px;border-radius:14px;border:1px solid #dbe4f1;background:#fff;color:var(--text);
      font:inherit;outline:none;transition:.2s;
    }
    input:focus,select:focus,textarea:focus{border-color:#8fb0ff;box-shadow:0 0 0 4px rgba(47,107,255,.08)}
    textarea{min-height:120px;resize:vertical}
    .submit-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
    .footer{
      margin-top:10px;padding:24px 0 28px;background:#0f1727;color:#dbe6ff
    }
    .footer a{color:#ffffff}
    .footer .container{display:grid;gap:14px}
    .footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:18px;align-items:start}
    .footer h3,.footer h4{margin:0 0 10px;color:#fff}
    .footer p,.footer li{color:#b9c7e3;margin:0}
    .footer ul{list-style:none;padding:0;margin:0;display:grid;gap:8px}
    .footer small{color:#91a3c7}
    .float-contact{
      position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px
    }
    .float-contact a,.to-top{
      width:48px;height:48px;border-radius:16px;display:grid;place-items:center;
      background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:var(--shadow2);
      border:0;cursor:pointer;
    }
    .to-top{background:#fff;color:var(--brand);border:1px solid var(--line)}
    .mobile-only{display:none}
    .kefu-card{display:grid;grid-template-columns:110px 1fr;gap:14px;align-items:center}
    .kefu-card img{border-radius:16px;border:1px solid #dfe7f4;background:#fff;padding:4px}
    .scroll-note{font-size:12px;color:#7a879a}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-4,.reviews,.articles,.footer-grid,.two-col,.price-list{grid-template-columns:1fr}
      .section-head{align-items:start;flex-direction:column}
      .nav-links{display:none}
      .menu-btn{display:inline-flex}
      .mobile-only{display:inline-flex}
      form{grid-template-columns:1fr}
      .hero{padding-top:24px}
    }
    .nav-panel{display:none;padding:0 0 14px}
    .nav-panel.active{display:block}
    .nav-panel .nav-links{display:flex;flex-direction:column;align-items:flex-start;gap:6px;padding:12px 0 0}
    .nav-panel .nav-cta{padding-top:10px}
    .fade-in{opacity:0;transform:translateY(14px);transition:.6s ease}
    .fade-in.visible{opacity:1;transform:none}