:root{
      --bg:#f6f8fc;
      --surface:#ffffff;
      --surface-2:#f3f7ff;
      --line:#dce6f5;
      --text:#1d2740;
      --muted:#5e6c87;
      --brand:#1b6cff;
      --brand-2:#00b3ff;
      --accent:#12b886;
      --warm:#ffb84d;
      --shadow:0 18px 40px rgba(24, 56, 120, .10);
      --shadow-soft:0 10px 24px rgba(24, 56, 120, .08);
      --radius:18px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
      background:
        radial-gradient(circle at top left, rgba(27,108,255,.10), transparent 28%),
        radial-gradient(circle at top right, rgba(0,179,255,.10), transparent 24%),
        linear-gradient(180deg, #f8fbff 0%, #f5f8fd 42%, #f7f9fd 100%);
      color:var(--text);
      line-height:1.65;
    }
    a{color:inherit;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:blur(16px);
      background:rgba(246,248,252,.82);
      border-bottom:1px solid rgba(220,230,245,.8);
    }
    .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:5px; box-shadow:var(--shadow-soft)}
    .brand-text{min-width:0}
    .brand-text strong{display:block; font-size:1.03rem; letter-spacing:.3px}
    .brand-text span{display:block; font-size:.86rem; color:var(--muted)}
    .nav-toggle{
      display:none; border:1px solid var(--line); background:#fff; color:var(--text);
      border-radius:12px; padding:10px 12px; font-size:15px;
    }
    .nav-links{display:flex; align-items:center; gap:18px; flex-wrap:wrap; justify-content:flex-end}
    .nav-links a{font-size:.95rem; color:var(--muted); padding:8px 10px; border-radius:10px; transition:.2s ease}
    .nav-links a:hover{color:var(--brand); background:rgba(27,108,255,.08)}
    .btn{
      display:inline-flex; align-items:center; justify-content:center; gap:8px;
      border:1px solid transparent; border-radius:14px; padding:12px 18px;
      font-weight:700; cursor:pointer; transition:.22s ease; white-space:nowrap;
    }
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2)); color:#fff; box-shadow:0 14px 26px rgba(27,108,255,.22)}
    .btn-primary:hover{transform:translateY(-2px); box-shadow:0 18px 32px rgba(27,108,255,.28)}
    .btn-ghost{background:#fff; color:var(--text); border-color:var(--line)}
    .btn-ghost:hover{transform:translateY(-2px); border-color:#b8c8e6}
    .hero{
      padding:52px 0 28px;
      position:relative;
      overflow:hidden;
    }
    .hero::before,.hero::after{
      content:""; position:absolute; border-radius:50%; pointer-events:none;
      background:radial-gradient(circle, rgba(27,108,255,.18), transparent 62%);
      filter:blur(2px);
      animation:float 10s ease-in-out infinite;
    }
    .hero::before{width:280px;height:280px; right:-100px; top:-40px}
    .hero::after{width:180px;height:180px; left:-70px; top:220px; animation-duration:12s}
    @keyframes float{50%{transform:translateY(12px)}}
    .hero-grid{display:grid; grid-template-columns:1.2fr .8fr; gap:22px; align-items:stretch}
    .hero-main,.hero-side,.card,.panel,.faq-item,.review,.article,.step,.metric,.compare,table,.form-card{
      background:rgba(255,255,255,.86); border:1px solid rgba(220,230,245,.95); border-radius:var(--radius);
      box-shadow:var(--shadow-soft);
    }
    .hero-main{padding:32px}
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px; padding:7px 12px; border-radius:999px;
      background:rgba(27,108,255,.10); color:var(--brand); font-size:.86rem; font-weight:700;
    }
    h1{margin:16px 0 14px; font-size:clamp(2rem, 5vw, 3.5rem); line-height:1.08}
    .hero p{margin:0; color:var(--muted); font-size:1.02rem}
    .hero-actions{display:flex; gap:12px; flex-wrap:wrap; margin-top:22px}
    .quick-tags{display:flex; flex-wrap:wrap; gap:10px; margin-top:22px}
    .tag{padding:8px 12px; background:#f4f8ff; border:1px solid #d8e4fb; border-radius:999px; color:#35507f; font-size:.9rem}
    .hero-side{padding:18px; display:grid; gap:14px}
    .mini-card{
      padding:16px; border-radius:16px; background:linear-gradient(180deg,#fff, #f7fbff);
      border:1px solid #e2ebf7;
    }
    .mini-card h3{margin:0 0 6px; font-size:1rem}
    .mini-card p{margin:0; color:var(--muted); font-size:.92rem}
    .stats{display:grid; grid-template-columns:repeat(4,1fr); gap:14px; margin:18px 0 10px}
    .metric{padding:18px}
    .metric strong{display:block; font-size:1.4rem; color:var(--brand); line-height:1.1}
    .metric span{display:block; color:var(--muted); font-size:.92rem; margin-top:6px}
    section{padding:24px 0}
    .section-head{display:flex; justify-content:space-between; align-items:end; gap:18px; margin-bottom:16px}
    .section-head h2{margin:0; font-size:1.65rem}
    .section-head p{margin:0; color:var(--muted)}
    .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,.panel,.review,.article,.step,.compare,.form-card{padding:20px}
    .card h3,.panel h3,.review h3,.article h3,.step h3{margin:0 0 8px; font-size:1.08rem}
    .card p,.panel p,.review p,.article p,.step p{margin:0; color:var(--muted)}
    .icon-badge{
      width:44px; height:44px; border-radius:14px; display:grid; place-items:center;
      background:linear-gradient(135deg, rgba(27,108,255,.12), rgba(0,179,255,.12));
      color:var(--brand); font-weight:800; margin-bottom:12px;
    }
    .section-soft{background:linear-gradient(180deg, rgba(240,246,255,.78), rgba(246,249,253,.36)); border-top:1px solid rgba(220,230,245,.6); border-bottom:1px solid rgba(220,230,245,.6)}
    .table-wrap{overflow:auto; border-radius:16px; border:1px solid var(--line); background:#fff}
    table{width:100%; border-collapse:collapse; min-width:760px; background:transparent; box-shadow:none}
    th,td{padding:14px 12px; border-bottom:1px solid #ecf1f8; text-align:left; vertical-align:top}
    th{background:#f6faff; color:#304364; font-size:.95rem}
    tr:hover td{background:#fbfdff}
    .rating{display:flex; align-items:center; gap:10px; flex-wrap:wrap; margin:10px 0 14px}
    .stars{color:#f8b400; letter-spacing:2px; font-size:1.1rem}
    .steps{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
    .step{position:relative}
    .step .num{position:absolute; right:16px; top:14px; font-size:2rem; color:rgba(27,108,255,.12); font-weight:800}
    .reviews,.articles{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .review .meta{display:flex; align-items:center; justify-content:space-between; gap:10px; margin-bottom:10px}
    .review .role{color:var(--brand); font-size:.9rem; font-weight:700}
    .quote{font-size:.95rem}
    .faq{display:grid; gap:12px}
    .faq-item summary{
      list-style:none; cursor:pointer; padding:18px 20px; font-weight:700; color:var(--text);
      display:flex; justify-content:space-between; align-items:center; gap:16px;
    }
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary::after{content:"+"; color:var(--brand); font-size:1.3rem; line-height:1}
    .faq-item[open] summary::after{content:"–"}
    .faq-item div{padding:0 20px 18px; color:var(--muted)}
    .form-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
    .field{display:flex; flex-direction:column; gap:8px}
    label{font-weight:700; font-size:.92rem}
    input,select,textarea{
      width:100%; border:1px solid #d9e3f1; border-radius:14px; padding:13px 14px; font:inherit; color:var(--text);
      background:#fff; outline:none; transition:.2s ease;
    }
    input:focus,select:focus,textarea:focus{border-color:rgba(27,108,255,.65); box-shadow:0 0 0 4px rgba(27,108,255,.10)}
    textarea{min-height:120px; resize:vertical}
    .full{grid-column:1 / -1}
    .tag-cloud{display:flex; flex-wrap:wrap; gap:10px}
    .tag-cloud .tag{background:#fff}
    .timeline{display:grid; gap:12px}
    .time-item{display:grid; grid-template-columns:88px 1fr; gap:14px; align-items:start; padding:16px 18px; border:1px solid var(--line); border-radius:16px; background:#fff}
    .time-item strong{color:var(--brand)}
    .floating{
      position:fixed; right:18px; bottom:18px; z-index:60; display:grid; gap:10px;
    }
    .float-btn{
      width:52px; height:52px; border-radius:16px; display:grid; place-items:center; color:#fff; font-weight:800;
      box-shadow:0 14px 28px rgba(27,108,255,.26);
    }
    .float-btn.service{background:linear-gradient(135deg,var(--brand),var(--brand-2))}
    .float-btn.top{background:linear-gradient(135deg,#12b886,#46d39e)}
    footer{
      padding:22px 0 28px; margin-top:10px;
      background:#f2f6fc; border-top:1px solid #dce6f5; color:#31415f;
    }
    footer a{color:#234fa8}
    .footer-grid{display:grid; grid-template-columns:1.15fr .85fr; gap:18px}
    .footer-note{color:#61718d; font-size:.92rem}
    .link-list{display:flex; flex-wrap:wrap; gap:10px}
    .link-list a{padding:8px 10px; border-radius:10px; background:#fff; border:1px solid #dce6f5}
    .mobile-only{display:none}
    .scroll-reveal{opacity:0; transform:translateY(18px); transition:.6s ease}
    .scroll-reveal.show{opacity:1; transform:none}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-2,.reviews,.articles,.steps,.footer-grid,.stats{grid-template-columns:1fr 1fr}
      .hero-grid{grid-template-columns:1fr}
      .steps{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 760px){
      .nav-toggle{display:inline-flex}
      .nav-links{
        display:none; width:100%; padding:12px 0 0; gap:8px; justify-content:flex-start;
      }
      .nav-links.open{display:flex}
      .nav{flex-wrap:wrap}
      .brand{flex:1}
      .stats,.grid-3,.grid-2,.reviews,.articles,.steps,.footer-grid,.form-grid{grid-template-columns:1fr}
      .hero{padding-top:28px}
      .hero-main,.hero-side,.card,.panel,.faq-item,.review,.article,.step,.metric,.compare,.form-card{padding:18px}
      .section-head{flex-direction:column; align-items:flex-start}
      .mobile-only{display:inline-flex}
      .time-item{grid-template-columns:1fr}
      table{min-width:680px}
    }