:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel-2:#f3f6ff;
      --text:#122033;
      --muted:#5c6b7f;
      --line:#dce4f1;
      --brand:#5b6cff;
      --brand-2:#8a5cff;
      --accent:#19b7a8;
      --warm:#ffb15c;
      --shadow:0 18px 45px rgba(19,32,54,.08);
      --shadow-2:0 10px 24px rgba(91,108,255,.16);
      --radius:20px;
      --radius-sm:14px;
      --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(91,108,255,.10), transparent 28%),
        radial-gradient(circle at top right, rgba(25,183,168,.10), transparent 22%),
        linear-gradient(180deg,#fbfcff 0%, #f5f7fc 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:blur(14px);
      background:rgba(247,248,252,.76);
      border-bottom:1px solid rgba(220,228,241,.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:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;padding:4px;box-shadow:var(--shadow)}
    .brand-text{display:flex;flex-direction:column;line-height:1.15}
    .brand-text strong{font-size:18px;letter-spacing:.4px}
    .brand-text span{font-size:12px;color:var(--muted)}
    .nav-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:var(--muted);padding:8px 10px;border-radius:999px;transition:.2s}
    .nav-links a:hover,.nav-links a:focus{background:rgba(91,108,255,.10);color:var(--text)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;gap:8px;
      border:none;border-radius:999px;padding:12px 18px;font-weight:700;cursor:pointer;
      transition:transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
      white-space:nowrap;
    }
    .btn:hover{transform:translateY(-1px)}
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:var(--shadow-2)}
    .btn-ghost{background:#fff;color:var(--text);border:1px solid var(--line)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);color:var(--text);border-radius:12px;padding:10px 12px}
    .hero{padding:34px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-main,.hero-side,.section-card,.feature-card,.review-card,.faq-item,.price-card,.timeline-card,.case-card,.article-card,.compare-card,.form-card,.network-card,.stats-card,.service-card,.match-card,.education-card{
      background:rgba(255,255,255,.82);border:1px solid rgba(220,228,241,.85);box-shadow:var(--shadow);border-radius:var(--radius)
    }
    .hero-main{padding:30px;position:relative;overflow:hidden}
    .hero-main:before,.hero-main:after{
      content:"";position:absolute;border-radius:50%;filter:blur(10px);pointer-events:none
    }
    .hero-main:before{width:180px;height:180px;background:radial-gradient(circle, rgba(91,108,255,.24), transparent 70%);right:-20px;top:-20px}
    .hero-main:after{width:140px;height:140px;background:radial-gradient(circle, rgba(25,183,168,.20), transparent 70%);left:-28px;bottom:-24px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:rgba(91,108,255,.10);color:#3346b0;font-size:13px;font-weight:700}
    h1{margin:16px 0 12px;font-size:clamp(32px,5vw,54px);line-height:1.06;letter-spacing:-.02em}
    .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}
    .hero-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:24px}
    .mini-card{padding:14px;border-radius:18px;background:linear-gradient(180deg,#f8faff,#eef3ff);border:1px solid var(--line)}
    .mini-card strong{display:block;font-size:18px;margin-bottom:4px}
    .mini-card span{font-size:13px;color:var(--muted);line-height:1.6}
    .hero-side{padding:24px;display:flex;flex-direction:column;gap:14px;justify-content:space-between}
    .hero-side .stats-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .stats-card{padding:16px;background:linear-gradient(180deg,#ffffff,#f5f8ff)}
    .stats-card b{display:block;font-size:22px;margin-bottom:6px;color:#1a2540}
    .stats-card span{font-size:13px;color:var(--muted);line-height:1.5}
    .hero-tagcloud{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:#3b4b63}
    .section{padding:18px 0}
    .section-card{padding:26px}
    .section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:18px;flex-wrap:wrap}
    .section-head h2{margin:0;font-size:28px;line-height:1.2}
    .section-head p{margin:0;color:var(--muted);max-width:780px;line-height:1.7}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .feature-card,.service-card,.review-card,.case-card,.article-card,.price-card,.timeline-card,.compare-card,.form-card,.network-card,.match-card,.education-card{padding:20px}
    .icon-badge{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(91,108,255,.14),rgba(25,183,168,.14));color:#3142a8;font-weight:900;margin-bottom:14px}
    .feature-card h3,.service-card h3,.case-card h3,.article-card h3,.price-card h3,.timeline-card h3,.review-card h3,.education-card h3,.match-card h3{margin:0 0 8px;font-size:18px}
    .feature-card p,.service-card p,.case-card p,.article-card p,.price-card p,.timeline-card p,.review-card p,.education-card p,.match-card p{margin:0;color:var(--muted);line-height:1.75;font-size:14px}
    .two-col{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .service-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .service-list .service-card{height:100%}
    .steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step{padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff,#f6f9ff);border:1px solid var(--line)}
    .step strong{display:flex;align-items:center;gap:10px;margin-bottom:8px;font-size:16px}
    .step em{font-style:normal;display:inline-flex;width:28px;height:28px;border-radius:999px;align-items:center;justify-content:center;background:rgba(91,108,255,.12);color:#3346b0;font-size:13px;font-weight:800}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line)}
    table{width:100%;border-collapse:collapse;min-width:860px;background:#fff}
    th,td{padding:14px 16px;border-bottom:1px solid #edf1f7;text-align:left;vertical-align:top;font-size:14px;line-height:1.6}
    th{background:#f6f8ff;color:#24324a}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:700}
    .badge.good{background:rgba(25,183,168,.12);color:#0d796f}
    .badge.warn{background:rgba(255,177,92,.16);color:#a15d09}
    .badge.brand{background:rgba(91,108,255,.12);color:#3346b0}
    .split{display:grid;grid-template-columns:1.05fr .95fr;gap:16px;align-items:start}
    .form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .field{display:flex;flex-direction:column;gap:8px}
    label{font-size:14px;font-weight:700;color:#2b3850}
    input,select,textarea{
      width:100%;padding:13px 14px;border:1px solid #d9e1ef;border-radius:14px;background:#fff;
      color:var(--text);font:inherit;outline:none;transition:border-color .2s, box-shadow .2s;
    }
    input:focus,select:focus,textarea:focus{border-color:#8a9bff;box-shadow:0 0 0 4px rgba(91,108,255,.12)}
    textarea{min-height:130px;resize:vertical}
    .form-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:6px}
    .muted{color:var(--muted)}
    details{
      border-top:1px solid #edf1f7;padding:14px 0
    }
    details summary{cursor:pointer;font-weight:700;color:#1f2d44;list-style:none}
    details summary::-webkit-details-marker{display:none}
    details p{margin:10px 0 0;color:var(--muted);line-height:1.8}
    .reviews,.cases,.articles,.price-grid,.timeline-grid,.network-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .review-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
    .stars{color:#f2b01e;letter-spacing:2px;font-size:14px}
    .footer{
      margin-top:18px;padding:24px 0 30px;border-top:1px solid rgba(220,228,241,.9);
      background:rgba(255,255,255,.72);
    }
    .footer-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:18px;align-items:start}
    .footer small,.footer p,.footer a{color:var(--muted)}
    .footer .links{display:flex;flex-wrap:wrap;gap:10px}
    .footer .links a{padding:7px 10px;border:1px solid var(--line);border-radius:999px;background:#fff}
    .floating{
      position:fixed;right:16px;bottom:16px;z-index:60;display:flex;flex-direction:column;gap:10px
    }
    .floating a,.floating button{
      width:50px;height:50px;border-radius:16px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow);display:grid;place-items:center;cursor:pointer
    }
    .backtop{display:none}
    .floating a:hover,.floating button:hover{transform:translateY(-1px)}
    .kefu-box{
      position:fixed;right:16px;bottom:78px;z-index:59;width:240px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:14px;display:none
    }
    .kefu-box.show{display:block}
    .kefu-box img{border-radius:14px;border:1px solid var(--line);width:100%;height:auto}
    .kefu-box strong{display:block;margin:8px 0 4px}
    .tag-row{display:flex;flex-wrap:wrap;gap:10px}
    .timeline-grid .timeline-card{position:relative;padding-top:18px}
    .timeline-card .time{display:inline-flex;padding:6px 10px;border-radius:999px;background:rgba(91,108,255,.10);color:#3346b0;font-weight:700;font-size:12px;margin-bottom:12px}
    .compare-highlight{
      display:flex;flex-wrap:wrap;gap:10px;margin-top:14px
    }
    .compare-highlight span{
      padding:8px 12px;border-radius:999px;background:#f5f8ff;border:1px solid var(--line);font-size:13px
    }
    .scroll-reveal{opacity:0;transform:translateY(18px);transition:.6s ease}
    .scroll-reveal.show{opacity:1;transform:none}
    @media (max-width: 1024px){
      .hero-grid,.split,.footer-grid,.two-col{grid-template-columns:1fr}
      .grid-4,.steps,.reviews,.cases,.articles,.price-grid,.timeline-grid,.network-grid,.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
      .service-list{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-toggle{display:inline-flex}
      .nav.open .nav-links{
        display:flex;position:absolute;left:16px;right:16px;top:76px;flex-direction:column;align-items:flex-start;
        padding:14px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)
      }
    }
    @media (max-width: 720px){
      .container{width:min(var(--container), calc(100% - 24px))}
      .hero-main,.hero-side,.section-card,.feature-card,.review-card,.faq-item,.price-card,.timeline-card,.case-card,.article-card,.compare-card,.form-card,.network-card,.stats-card,.service-card,.match-card,.education-card{padding:18px}
      .hero-points,.grid-4,.steps,.reviews,.cases,.articles,.price-grid,.timeline-grid,.network-grid,.grid-3,.form-grid{grid-template-columns:1fr}
      h1{font-size:30px}
      .section-head h2{font-size:24px}
      .nav{min-height:70px}
      .brand-text span{display:none}
      .kefu-box{width:calc(100vw - 32px);max-width:300px}
    }