:root{
      --bg:#f5f8ff;
      --bg2:#eef4ff;
      --card:#ffffff;
      --text:#13213a;
      --muted:#5e6b84;
      --line:#d8e1f2;
      --brand:#0d47a1;
      --brand2:#2b7cff;
      --brand3:#14b8a6;
      --accent:#ffb703;
      --shadow:0 18px 50px rgba(13,71,161,.12);
      --radius:22px;
      --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 15% 10%, rgba(43,124,255,.14), transparent 24%),
        radial-gradient(circle at 85% 0%, rgba(20,184,166,.14), transparent 20%),
        linear-gradient(180deg, #f9fbff 0%, var(--bg) 36%, #f7f9fd 100%);
      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,.site-header,.site-footer{width:100%}
    .topbar{
      background:rgba(13,71,161,.95);
      color:#fff;
      font-size:14px;
    }
    .topbar .container{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 0}
    .topbar strong{font-weight:700}
    .topbar .mini-links{display:flex;gap:14px;flex-wrap:wrap}
    .topbar a{color:#fff;opacity:.95}
    .site-header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:blur(14px);
      background:rgba(247,249,253,.82);
      border-bottom:1px solid rgba(216,225,242,.8);
    }
    .header-inner{
      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:4px;box-shadow:0 10px 24px rgba(13,71,161,.12)}
    .brand h2{margin:0;font-size:16px;line-height:1.2}
    .brand p{margin:2px 0 0;color:var(--muted);font-size:12px}
    .nav-wrap{display:flex;align-items:center;gap:12px}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:14px;padding:10px 12px;font-weight:700}
    nav ul{list-style:none;margin:0;padding:0;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
    nav a{color:var(--text);font-weight:600;font-size:14px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      padding:12px 18px;border-radius:999px;border:1px solid transparent;
      font-weight:700;transition:.25s ease;cursor:pointer;white-space:nowrap
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 14px 30px rgba(13,71,161,.18)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
    .hero{
      position:relative;overflow:hidden;padding:42px 0 24px;
    }
    .hero::before,.hero::after{
      content:"";position:absolute;border-radius:50%;filter:blur(20px);pointer-events:none
    }
    .hero::before{width:260px;height:260px;background:rgba(43,124,255,.14);right:-60px;top:10px}
    .hero::after{width:220px;height:220px;background:rgba(20,184,166,.12);left:-60px;bottom:10px}
    .hero-grid{
      display:grid;grid-template-columns:1.15fr .85fr;gap:26px;align-items:stretch
    }
    .hero-card{
      background:linear-gradient(160deg, rgba(13,71,161,.98), rgba(43,124,255,.9));
      color:#fff;border-radius:30px;padding:34px;box-shadow:0 24px 60px rgba(13,71,161,.2);position:relative;overflow:hidden
    }
    .hero-card::after{
      content:"";position:absolute;inset:auto -40px -100px auto;width:240px;height:240px;border-radius:50%;
      background:radial-gradient(circle, rgba(255,255,255,.18), transparent 60%)
    }
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);padding:8px 12px;border-radius:999px;font-size:13px}
    h1{margin:16px 0 14px;font-size:clamp(30px,5vw,52px);line-height:1.08}
    .hero p{margin:0;color:rgba(255,255,255,.9);max-width:58ch;font-size:16px}
    .hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
    .hero-stats{
      display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px
    }
    .stat{
      background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.14);border-radius:20px;padding:16px
    }
    .stat strong{display:block;font-size:22px;line-height:1.2}
    .stat span{color:rgba(255,255,255,.88);font-size:13px}
    .hero-side{
      display:grid;gap:14px
    }
    .side-card{
      background:rgba(255,255,255,.88);border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow)
    }
    .side-card h3{margin:0 0 10px;font-size:18px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 12px;border-radius:999px;background:#eef5ff;color:#0d47a1;border:1px solid #d9e7ff;font-size:13px;font-weight:600}
    main{padding:10px 0 40px}
    section{padding:22px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:14px;margin-bottom:18px;flex-wrap:wrap}
    .section-head h2{margin:0;font-size:28px;line-height:1.15}
    .section-head p{margin:0;color:var(--muted);max-width:70ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .card{
      background:rgba(255,255,255,.88);border:1px solid rgba(216,225,242,.85);border-radius:var(--radius);
      padding:22px;box-shadow:0 10px 30px rgba(18,33,58,.06);transition:.25s ease
    }
    .card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
    .card h3,.card h4{margin:0 0 10px}
    .card p{margin:0;color:var(--muted)}
    .metric{display:flex;align-items:flex-start;gap:14px}
    .metric .icon{
      width:48px;height:48px;border-radius:16px;display:grid;place-items:center;
      background:linear-gradient(135deg, rgba(13,71,161,.1), rgba(43,124,255,.16));color:var(--brand);font-size:22px;flex:none
    }
    .metric strong{display:block;font-size:26px;line-height:1.1}
    .metric span{color:var(--muted);font-size:13px}
    .list-check{display:grid;gap:10px;padding:0;margin:14px 0 0;list-style:none}
    .list-check li{position:relative;padding-left:24px;color:var(--text)}
    .list-check li::before{content:"✓";position:absolute;left:0;top:0;color:var(--brand);font-weight:900}
    .panel{
      background:linear-gradient(180deg, #ffffff, #f7faff);
      border:1px solid var(--line);border-radius:24px;padding:22px;overflow:hidden
    }
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;border-radius:20px;background:#fff;border:1px solid var(--line)}
    .step .num{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:50%;background:var(--brand);color:#fff;font-weight:800;margin-bottom:12px}
    .table-wrap{overflow:auto;border-radius:20px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:14px 16px;border-bottom:1px solid #edf2fb;text-align:left;vertical-align:top}
    th{background:#f4f8ff;color:#193058}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:#eaf3ff;color:#0d47a1;font-size:12px;font-weight:700}
    .rating{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
    .stars{color:#ffb703;font-size:18px;letter-spacing:1px}
    .comparison{
      display:grid;grid-template-columns:1fr .9fr;gap:16px;align-items:start
    }
    .price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .price{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px}
    .price strong{display:block;font-size:28px;color:var(--brand)}
    .timeline{display:grid;gap:12px}
    .time-item{display:grid;grid-template-columns:110px 1fr;gap:14px;background:#fff;border:1px solid var(--line);border-radius:20px;padding:16px}
    .time-item time{font-weight:800;color:var(--brand)}
    .faq{display:grid;gap:12px}
    details{
      background:#fff;border:1px solid var(--line);border-radius:18px;padding:0 18px;box-shadow:0 8px 24px rgba(18,33,58,.05)
    }
    summary{cursor:pointer;list-style:none;padding:16px 0;font-weight:700}
    summary::-webkit-details-marker{display:none}
    details p{padding:0 0 16px;margin:0;color:var(--muted)}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}
    .review .role{color:var(--brand);font-size:13px;font-weight:700}
    .review .quote{font-size:15px;color:var(--text)}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article a{display:inline-flex;margin-top:12px;font-weight:700}
    .form-grid{display:grid;grid-template-columns:1fr .9fr;gap:16px}
    form{display:grid;gap:12px}
    .field{display:grid;gap:8px}
    label{font-size:14px;font-weight:700}
    input,select,textarea{
      width:100%;border:1px solid var(--line);background:#fff;border-radius:14px;padding:12px 14px;font:inherit;color:var(--text);outline:none
    }
    input:focus,select:focus,textarea:focus{border-color:var(--brand2);box-shadow:0 0 0 4px rgba(43,124,255,.12)}
    textarea{min-height:120px;resize:vertical}
    .contact-cards{display:grid;gap:12px}
    .contact-item{padding:16px;border-radius:18px;background:#f8fbff;border:1px solid #dce7fa}
    .footer{
      background:#0b1f45;color:#dbe7ff;margin-top:20px
    }
    .footer a{color:#fff}
    .footer .container{padding:28px 0}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:16px;align-items:start}
    .footer small{color:#bfd0ef}
    .footer .links{display:flex;flex-wrap:wrap;gap:10px}
    .footer .links a{background:rgba(255,255,255,.08);padding:8px 12px;border-radius:999px}
    .floating{
      position:fixed;right:16px;bottom:18px;z-index:60;display:grid;gap:10px
    }
    .float-btn{
      display:inline-flex;align-items:center;justify-content:center;min-width:52px;height:52px;padding:0 14px;border-radius:999px;
      background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:800;box-shadow:0 14px 30px rgba(13,71,161,.22)
    }
    .backtop{background:#fff;color:var(--brand);border:1px solid var(--line)}
    .inview{opacity:0;transform:translateY(18px);transition:.6s ease}
    .inview.show{opacity:1;transform:none}
    .nav-panel{display:flex;align-items:center;gap:14px}
    .mobile-menu{display:none}
    @media (max-width: 1024px){
      .hero-grid,.comparison,.form-grid,.footer-grid,.grid-3,.reviews,.articles,.grid-2,.price-grid,.steps{grid-template-columns:1fr 1fr}
      .hero-side{grid-column:1/-1}
    }
    @media (max-width: 768px){
      .topbar .container{flex-direction:column;align-items:flex-start}
      .nav-toggle{display:inline-flex}
      .nav-wrap{margin-left:auto}
      nav{display:none;position:absolute;left:16px;right:16px;top:68px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:14px}
      nav.open{display:block}
      nav ul{flex-direction:column;align-items:flex-start;gap:12px}
      .hero{padding-top:22px}
      .hero-card{padding:24px;border-radius:24px}
      .hero-stats,.hero-grid,.comparison,.form-grid,.footer-grid,.grid-3,.reviews,.articles,.grid-2,.price-grid,.steps{grid-template-columns:1fr}
      .section-head h2{font-size:24px}
      .time-item{grid-template-columns:1fr}
      .brand p{display:none}
    }