:root{
      --bg:#f5f8fc;
      --panel:#ffffff;
      --panel-2:#f8fbff;
      --line:#dbe5f2;
      --text:#17324d;
      --muted:#5e738d;
      --brand:#1f74ff;
      --brand-2:#19c6a5;
      --brand-3:#ffb347;
      --shadow:0 18px 50px rgba(28, 61, 104, .10);
      --radius:22px;
      --radius-sm:16px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(31,116,255,.10), transparent 30%),
        radial-gradient(circle at 85% 12%, rgba(25,198,165,.10), transparent 28%),
        linear-gradient(180deg, #f8fbff 0%, #f4f8fc 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%;height:auto}
    .container{width:min(100%, var(--container)); margin:0 auto; padding:0 20px}
    .site-header{
      position:sticky; top:0; z-index:40;
      backdrop-filter:blur(14px);
      background:rgba(248,251,255,.86);
      border-bottom:1px solid rgba(219,229,242,.8);
    }
    .nav{
      display:flex; align-items:center; justify-content:space-between; gap:16px;
      min-height:76px;
    }
    .brand{display:flex; align-items:center; gap:12px; min-width:0}
    .brand .ai-page-logo{width:42px; height:42px; object-fit:contain}
    .brand-text{display:flex; flex-direction:column; min-width:0}
    .brand-text strong{font-size:18px; letter-spacing:.4px}
    .brand-text span{font-size:12px; color:var(--muted)}
    .nav-toggle{
      display:none; border:1px solid var(--line); background:var(--panel); color:var(--text);
      border-radius:12px; padding:10px 12px; box-shadow:var(--shadow)
    }
    .nav-links{display:flex; align-items:center; gap:14px; flex-wrap:wrap; justify-content:flex-end}
    .nav-links a{font-size:14px; color:var(--muted); padding:8px 10px; border-radius:999px}
    .nav-links a:hover{background:#eaf2ff; color:var(--brand)}
    .home-btn{
      background:linear-gradient(135deg, var(--brand) 0%, #4f8bff 100%);
      color:#fff !important; padding:10px 16px !important; box-shadow:0 12px 24px rgba(31,116,255,.22)
    }
    .hero{
      padding:46px 0 24px;
      overflow:hidden;
    }
    .hero-grid{
      display:grid; grid-template-columns:1.25fr .85fr; gap:24px; align-items:stretch;
    }
    .hero-main,.hero-side,.card,.section-card,.faq-item,.review-card,.article-card,.case-card,.price-card,.timeline-card,.form-card,.metrics-card,.compare-card{
      background:linear-gradient(180deg, rgba(255,255,255,.98), rgba(248,251,255,.98));
      border:1px solid rgba(219,229,242,.95);
      box-shadow:var(--shadow);
      border-radius:var(--radius);
    }
    .hero-main{padding:34px; position:relative; isolation:isolate}
    .hero-main:before{
      content:""; position:absolute; inset:auto -40px -40px auto; width:240px; height:240px;
      background:radial-gradient(circle, rgba(31,116,255,.16), transparent 64%);
      z-index:-1;
    }
    .eyebrow{
      display:inline-flex; align-items:center; gap:8px;
      padding:8px 12px; border-radius:999px;
      background:#eef5ff; color:#2460d8; font-size:13px; font-weight:600;
      border:1px solid #d8e7ff;
    }
    h1{margin:16px 0 14px; font-size:clamp(32px, 5vw, 54px); line-height:1.08}
    .hero p{margin:0; color:var(--muted); font-size:16px; line-height:1.8}
    .hero-actions{display:flex; flex-wrap:wrap; gap:12px; margin-top:24px}
    .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:.25s ease; cursor:pointer;
    }
    .btn-primary{background:linear-gradient(135deg, var(--brand) 0%, #2d8eff 100%); color:#fff; box-shadow:0 12px 24px rgba(31,116,255,.22)}
    .btn-ghost{background:#fff; border-color:var(--line); color:var(--text)}
    .btn:hover{transform:translateY(-2px); box-shadow:0 16px 28px rgba(20,56,106,.12)}
    .hero-meta{display:flex; gap:14px; flex-wrap:wrap; margin-top:22px}
    .meta-pill{
      background:#f6faff; border:1px solid var(--line); border-radius:14px;
      padding:12px 14px; min-width:140px
    }
    .meta-pill strong{display:block; font-size:18px}
    .meta-pill span{font-size:12px; color:var(--muted)}
    .hero-side{padding:22px}
    .hero-side .panel-title{margin:0 0 14px; font-size:18px}
    .mini-stack{display:grid; gap:12px}
    .mini-item{padding:14px; border-radius:16px; background:var(--panel-2); border:1px solid var(--line)}
    .mini-item strong{display:block; margin-bottom:6px}
    .mini-item span{color:var(--muted); font-size:14px; line-height:1.6}
    .section{padding:18px 0 2px}
    .section-head{display:flex; align-items:end; justify-content:space-between; gap:18px; margin:0 0 16px}
    .section-head h2{margin:0; font-size:28px}
    .section-head p{margin:0; color:var(--muted); max-width:720px; line-height:1.7}
    .grid-4{display:grid; grid-template-columns:repeat(4,1fr); gap:16px}
    .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,.section-card,.price-card,.timeline-card,.form-card,.compare-card,.metrics-card,.faq-item,.review-card,.article-card,.case-card{padding:20px}
    .card h3,.section-card h3,.case-card h3,.article-card h3,.review-card h3{margin:0 0 10px; font-size:18px}
    .card p,.section-card p,.case-card p,.article-card p,.review-card p,.timeline-card p{margin:0; color:var(--muted); line-height:1.7}
    .stat{font-size:30px; font-weight:800; color:var(--brand)}
    .chip-list{display:flex; flex-wrap:wrap; gap:8px; margin-top:14px}
    .chip{padding:7px 10px; border-radius:999px; background:#edf4ff; border:1px solid #d9e7ff; color:#2a5fcf; font-size:12px}
    .workflow{display:grid; grid-template-columns:repeat(5,1fr); gap:14px}
    .step{
      position:relative; padding:18px; border-radius:18px; background:linear-gradient(180deg,#fff,#f8fbff);
      border:1px solid var(--line)
    }
    .step b{display:inline-flex; width:34px; height:34px; border-radius:10px; align-items:center; justify-content:center; background:#eaf2ff; color:var(--brand); margin-bottom:12px}
    .step h3{margin:0 0 8px; font-size:16px}
    .step p{margin:0; color:var(--muted); font-size:14px; line-height:1.7}
    .table-wrap{overflow:auto; border-radius:18px; border:1px solid var(--line); background:#fff}
    table{width:100%; border-collapse:collapse; min-width:920px}
    th,td{padding:14px 16px; border-bottom:1px solid #edf2f8; text-align:left; vertical-align:top}
    th{background:#f5f9ff; color:#35506d; font-size:14px}
    td{color:var(--text)}
    .good{color:#0f8a61; font-weight:700}
    .bad{color:#b85d31; font-weight:700}
    .accent{color:var(--brand); font-weight:800}
    .accordion{display:grid; gap:12px}
    .faq-item summary{list-style:none; cursor:pointer; font-weight:700; font-size:16px}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item .answer{margin-top:12px; color:var(--muted); line-height:1.8}
    .quotes{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .review-card .name{margin-top:14px; font-weight:700}
    .review-card .role{font-size:13px; color:var(--muted); margin-top:3px}
    .cases,.articles{display:grid; grid-template-columns:repeat(3,1fr); gap:16px}
    .case-card .tag,.article-card .tag{display:inline-block; margin-bottom:12px; color:#2565e4; background:#edf4ff; padding:6px 10px; border-radius:999px; font-size:12px}
    .form-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:14px}
    .field{display:flex; flex-direction:column; gap:8px}
    label{font-size:14px; font-weight:700}
    input,select,textarea{
      width:100%; border:1px solid var(--line); background:#fff; color:var(--text);
      border-radius:14px; padding:12px 14px; font:inherit; outline:none;
    }
    textarea{min-height:122px; resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#8eb7ff; box-shadow:0 0 0 4px rgba(31,116,255,.10)}
    .full{grid-column:1/-1}
    .footer{
      margin-top:24px;
      padding:24px 0 28px;
      border-top:1px solid rgba(219,229,242,.9);
      background:linear-gradient(180deg, rgba(248,251,255,.92), rgba(242,247,252,.98));
      color:#203449;
    }
    .footer-grid{display:grid; grid-template-columns:1.2fr .8fr; gap:18px; align-items:start}
    .footer a{color:#214fca}
    .footer small,.footer p{color:#5e738d; line-height:1.7}
    .footer-links{display:flex; flex-wrap:wrap; gap:10px}
    .footer-links a{padding:8px 10px; border:1px solid var(--line); border-radius:999px; background:#fff}
    .float-tools{
      position:fixed; right:16px; bottom:16px; z-index:50;
      display:flex; flex-direction:column; gap:10px;
    }
    .float-tools a,.float-tools button{
      width:52px; height:52px; border-radius:16px; border:none; display:flex; align-items:center; justify-content:center;
      background:linear-gradient(135deg, var(--brand) 0%, #3ea0ff 100%); color:#fff; box-shadow:0 14px 26px rgba(31,116,255,.24); cursor:pointer;
    }
    .floating-qrcode{
      position:fixed; right:16px; bottom:82px; z-index:49;
      width:178px; padding:12px; border-radius:18px; background:#fff; border:1px solid var(--line); box-shadow:var(--shadow);
      display:none;
    }
    .floating-qrcode img{border-radius:12px; margin-top:8px}
    .timeline{display:grid; gap:12px}
    .timeline-item{
      display:grid; grid-template-columns:74px 1fr; gap:14px; align-items:start;
      padding:16px; border-radius:18px; background:#fff; border:1px solid var(--line)
    }
    .timeline-item .time{font-weight:800; color:var(--brand)}
    .tag-cloud{display:flex; flex-wrap:wrap; gap:10px}
    .tag-cloud span{padding:8px 12px; border-radius:999px; background:#fff; border:1px solid var(--line); color:#49627d}
    .notice{
      margin-top:14px; padding:14px 16px; border-radius:16px; background:#f2f8ff; border:1px solid #dbe8ff; color:#35506d;
    }
    .mobile-only{display:none}
    .scroll-appear{opacity:0; transform:translateY(16px); transition:.7s ease}
    .scroll-appear.show{opacity:1; transform:none}
    .rating{
      display:flex; align-items:center; gap:10px; flex-wrap:wrap;
      margin:10px 0 14px;
    }
    .stars{color:#ff9f2d; font-size:20px; letter-spacing:2px}
    .compare-score{
      padding:18px; border-radius:18px; background:linear-gradient(135deg, #f2f8ff, #eefcf8); border:1px solid #d7e8ff;
    }
    .compare-score strong{display:block; font-size:30px; margin-top:4px}
    .hero-tags{display:flex; flex-wrap:wrap; gap:10px; margin-top:18px}
    .hero-tags span{padding:8px 11px; border-radius:999px; background:rgba(255,255,255,.75); border:1px solid var(--line); color:#47617b; font-size:13px}
    @media (max-width: 1024px){
      .hero-grid,.grid-4,.grid-3,.workflow,.quotes,.cases,.articles,.footer-grid{grid-template-columns:1fr 1fr}
      .workflow{grid-template-columns:1fr 1fr 1fr}
    }
    @media (max-width: 768px){
      .nav-toggle{display:inline-flex}
      .nav-links{
        display:none; width:100%; padding:12px 0 4px; justify-content:flex-start
      }
      .nav-links.open{display:flex}
      .nav{flex-wrap:wrap}
      .hero-grid,.grid-4,.grid-3,.grid-2,.quotes,.cases,.articles,.footer-grid,.workflow{grid-template-columns:1fr}
      .form-grid{grid-template-columns:1fr}
      .section-head{flex-direction:column; align-items:flex-start}
      .hero{padding-top:24px}
      .hero-main{padding:24px}
      .mobile-only{display:block}
      .desktop-only{display:none}
      .nav-links a{padding:10px 0}
    }