:root{
      --bg:#f6f8fc;
      --bg2:#eef5ff;
      --card:#ffffff;
      --text:#1f2a37;
      --muted:#5b6677;
      --line:#dbe5f2;
      --primary:#2369f7;
      --primary2:#12b3a8;
      --accent:#ffb02e;
      --shadow:0 14px 40px rgba(28,55,90,.08);
      --radius:20px;
      --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;background:linear-gradient(180deg,var(--bg2),#fff 18%,var(--bg) 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}
    header{position:sticky;top:0;z-index:50;background:rgba(246,248,252,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(219,229,242,.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:44px;height:44px;border-radius:12px;object-fit:contain;background:#fff;border:1px solid var(--line);padding:6px;box-shadow:0 8px 18px rgba(35,105,247,.08)}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:18px;line-height:1.2}
    .brand-text span{display:block;color:var(--muted);font-size:12px}
    .nav-links{display:flex;align-items:center;gap:14px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a,.nav-actions a,.nav-actions button{font-size:14px;padding:10px 14px;border-radius:999px;border:1px solid transparent;transition:.25s ease;cursor:pointer}
    .nav-links a:hover,.nav-actions a:hover,.nav-actions button:hover{transform:translateY(-1px)}
    .nav-links a{color:var(--text)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .ghost{background:#fff;border-color:var(--line);color:var(--text);box-shadow:0 8px 20px rgba(34,51,84,.05)}
    .primary{background:linear-gradient(135deg,var(--primary),#4c8dff);color:#fff;box-shadow:0 14px 28px rgba(35,105,247,.22)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);color:var(--text);padding:10px 12px;border-radius:12px}
    main{overflow:hidden}
    section{padding:72px 0}
    .hero{padding:42px 0 64px;position:relative}
    .hero::before,.hero::after{content:"";position:absolute;border-radius:50%;filter:blur(2px);pointer-events:none}
    .hero::before{width:260px;height:260px;background:radial-gradient(circle,rgba(35,105,247,.16),rgba(35,105,247,0) 70%);right:-80px;top:0}
    .hero::after{width:220px;height:220px;background:radial-gradient(circle,rgba(18,179,168,.16),rgba(18,179,168,0) 70%);left:-60px;bottom:0}
    .hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:28px;align-items:center}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 14px;border-radius:999px;background:#eaf2ff;color:#205ddf;font-weight:700;font-size:13px;border:1px solid #dbe7ff}
    h1{font-size:clamp(34px,5vw,58px);line-height:1.05;margin:18px 0 16px;letter-spacing:-.03em}
    .lead{font-size:18px;color:var(--muted);max-width:58ch;margin:0 0 24px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:22px}
    .hero-meta{display:flex;flex-wrap:wrap;gap:10px}
    .pill{padding:10px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--text);font-size:13px}
    .hero-panel{background:linear-gradient(180deg,#fff, #f8fbff);border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow);padding:22px}
    .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:18px}
    .stat,.card,.review,.quote,.faq-item,.article,.price-box,.compare,.form-box,.timeline li,.help-box{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
    .stat{padding:18px}
    .stat b{display:block;font-size:26px;line-height:1.1;color:#0d2a67}
    .stat span{display:block;color:var(--muted);font-size:13px;margin-top:6px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:22px}
    .section-head h2{font-size:clamp(26px,3vw,38px);margin:0}
    .section-head p{margin:0;color:var(--muted);max-width:66ch}
    .card{padding:22px;transition:transform .22s ease,box-shadow .22s ease,border-color .22s ease}
    .card:hover{transform:translateY(-4px);box-shadow:0 18px 42px rgba(28,55,90,.12);border-color:#c8d7eb}
    .card h3{margin:4px 0 10px;font-size:18px}
    .card p{margin:0;color:var(--muted)}
    .icon{width:46px;height:46px;border-radius:14px;background:linear-gradient(135deg,#e9f1ff,#f8fbff);display:grid;place-items:center;color:var(--primary);font-weight:800;margin-bottom:12px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#30445f;font-size:13px}
    .steps{counter-reset:step}
    .step{position:relative;padding-left:58px}
    .step::before{counter-increment:step;content:counter(step);position:absolute;left:18px;top:20px;width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;display:grid;place-items:center;font-size:13px;font-weight:700}
    .table-wrap{overflow:auto;border-radius:22px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:16px 14px;border-bottom:1px solid #edf2f8;text-align:left;vertical-align:top}
    th{background:#f4f8ff;color:#173260;font-size:14px}
    td{color:var(--text);font-size:14px}
    .rating{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
    .stars{color:#ffb02e;font-size:20px;letter-spacing:2px}
    .split{display:grid;grid-template-columns:1.06fr .94fr;gap:18px;align-items:start}
    .quote{padding:20px}
    .quote strong{display:block;margin-bottom:8px}
    .review .meta{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:10px}
    .review .role{color:#2a4c83;font-weight:700}
    .review p{margin:0;color:var(--muted)}
    .article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .article a{display:block;color:var(--primary);font-weight:700;margin-top:14px}
    .article .date{color:var(--muted);font-size:13px;margin-bottom:10px}
    .form-box{padding:22px}
    form{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    label{display:block;font-size:13px;font-weight:700;color:#29415f;margin-bottom:6px}
    input,select,textarea{width:100%;padding:12px 14px;border-radius:14px;border:1px solid #cfd9e8;background:#fff;color:var(--text);font:inherit;outline:none;transition:border-color .2s ease,box-shadow .2s ease}
    input:focus,select:focus,textarea:focus{border-color:#7ea7ff;box-shadow:0 0 0 4px rgba(35,105,247,.1)}
    textarea{min-height:124px;resize:vertical}
    .full{grid-column:1/-1}
    .submit-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:4px}
    .submit-row small{color:var(--muted)}
    .faq-item{padding:0;overflow:hidden}
    .faq-q{width:100%;text-align:left;padding:18px 20px;background:transparent;border:0;color:var(--text);font:inherit;font-weight:700;display:flex;justify-content:space-between;gap:14px;align-items:center;cursor:pointer}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease,padding .28s ease}
    .faq-item.open .faq-a{max-height:220px;padding:0 20px 18px}
    .faq-item.open .chev{transform:rotate(180deg)}
    .chev{transition:transform .22s ease;color:var(--primary)}
    .timeline{list-style:none;margin:0;padding:0;display:grid;gap:14px}
    .timeline li{padding:18px 20px}
    .timeline strong{display:block;margin-bottom:6px}
    .service-map{display:flex;flex-wrap:wrap;gap:10px}
    .service-map a{padding:10px 12px;border-radius:12px;background:#fff;border:1px solid var(--line);font-size:13px;color:#2b4365}
    .footer-top{display:grid;grid-template-columns:1.05fr .95fr;gap:18px}
    footer{padding:28px 0 40px;background:#eef4fb;color:#21324a;border-top:1px solid #d9e4f1}
    footer a{color:#1f5fd2}
    .foot-note{margin-top:18px;color:#627287;font-size:13px}
    .float-wrap{position:fixed;right:18px;bottom:18px;z-index:60;display:flex;flex-direction:column;gap:10px}
    .float-btn{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),#4c8dff);color:#fff;box-shadow:0 12px 28px rgba(35,105,247,.25);border:0;cursor:pointer}
    .float-btn.secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
    .mobile-panel{display:none}
    .mini-images{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .mini-images img{width:100%;border-radius:18px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    .compare-badge{display:inline-flex;padding:8px 12px;border-radius:999px;background:#eff8ff;color:#1653c7;font-weight:700}
    .progress{height:10px;border-radius:999px;background:#e7eef8;overflow:hidden}
    .progress i{display:block;height:100%;width:99%;background:linear-gradient(90deg,#2b7cff,#12b3a8)}
    @media (max-width: 980px){
      .hero-grid,.split,.grid-2,.grid-3,.grid-4,.article-list,.footer-top,.stats{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-btn{display:inline-flex}
      .mobile-panel{display:none;padding:0 0 16px}
      .mobile-panel.open{display:block}
      .mobile-panel .nav-links{display:flex;flex-direction:column;align-items:stretch}
      .mobile-panel .nav-links a,.mobile-panel .nav-actions a{width:100%;text-align:center}
      form{grid-template-columns:1fr}
      .hero{padding-top:26px}
      .stats{grid-template-columns:repeat(2,1fr)}
      .mini-images{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 640px){
      section{padding:56px 0}
      .container{width:min(var(--container),calc(100% - 24px))}
      .nav{padding:12px 0}
      .brand-text strong{font-size:16px}
      .stats{grid-template-columns:1fr}
      .mini-images{grid-template-columns:1fr}
      .hero-actions,.nav-actions{width:100%}
      .nav-actions{justify-content:space-between}
      .hero-panel{padding:16px}
    }
    .reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
    .reveal.visible{opacity:1;transform:translateY(0)}