:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel2:#f2f6ff;
      --text:#1e2a39;
      --muted:#5f6d7f;
      --line:#dce3ef;
      --brand:#2563eb;
      --brand2:#7c3aed;
      --brand3:#14b8a6;
      --shadow:0 18px 40px rgba(27,45,87,.10);
      --radius:20px;
      --radius2:14px;
      --max: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:
      radial-gradient(circle at top left, rgba(37,99,235,.12), transparent 28%),
      radial-gradient(circle at 85% 8%, rgba(124,58,237,.10), transparent 24%),
      linear-gradient(180deg,#f9fbff 0%, #f6f8fc 28%, #f8fbff 100%);
      color:var(--text);line-height:1.65}
    a{color:var(--brand);text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(100%,var(--max));margin:0 auto;padding:0 20px}
    .topbar{position:sticky;top:0;z-index:50;background:rgba(247,248,252,.86);backdrop-filter:blur(14px);border-bottom:1px solid rgba(220,227,239,.7)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:72px}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:10px;background:#fff;padding:4px;box-shadow:0 8px 20px rgba(37,99,235,.12)}
    .brand h2{margin:0;font-size:18px;line-height:1.1}
    .brand p{margin:2px 0 0;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{color:var(--text);font-size:14px;padding:8px 10px;border-radius:10px}
    .nav-links a:hover{background:#edf3ff;color:#1246b0}
    .nav-cta{display:flex;align-items:center;gap:10px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:12px 18px;font-weight:700;cursor:pointer;transition:.25s ease;box-shadow:0 10px 24px rgba(37,99,235,.14)}
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff}
    .btn-secondary{background:#fff;color:var(--text);border:1px solid var(--line);box-shadow:none}
    .btn:hover{transform:translateY(-2px)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px}
    .menu-btn span,.menu-btn span:before,.menu-btn span:after{display:block;width:20px;height:2px;background:#324156;border-radius:2px;content:"";position:relative}
    .menu-btn span:before{position:absolute;top:-6px}
    .menu-btn span:after{position:absolute;top:6px}
    .hero{padding:42px 0 22px}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;align-items:stretch}
    .hero-main,.hero-side,.section-card,.review-card,.step,.adv-card,.case-card,.article-card,.faq-item,.compare,.form-box,.contact-box,.network-box,.price-box,.timeline-box{background:var(--panel);border:1px solid rgba(220,227,239,.9);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-main{padding:34px;position:relative;overflow:hidden}
    .hero-main:before{content:"";position:absolute;inset:auto -80px -80px auto;width:260px;height:260px;background:radial-gradient(circle, rgba(37,99,235,.16), transparent 68%);pointer-events:none}
    .kicker{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#eff6ff;color:#1d4ed8;font-weight:700;font-size:13px}
    h1{margin:16px 0 14px;font-size:clamp(30px,4vw,52px);line-height:1.08;letter-spacing:-.02em}
    .hero p{margin:0;color:var(--muted);font-size:16px;max-width:60ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .mini{padding:14px;border-radius:16px;background:linear-gradient(180deg,#f7faff,#eef4ff);border:1px solid #dce8ff}
    .mini strong{display:block;font-size:18px}
    .mini span{display:block;color:var(--muted);font-size:13px;margin-top:3px}
    .hero-side{padding:22px;display:grid;gap:14px}
    .side-metrics{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    .metric{padding:16px;border-radius:16px;background:linear-gradient(180deg,#fbfcff,#f4f7ff);border:1px solid #e4ebf7}
    .metric b{font-size:26px;display:block;color:#143a82}
    .metric span{font-size:13px;color:var(--muted)}
    .side-note{padding:16px;border-radius:16px;background:linear-gradient(135deg,rgba(20,184,166,.10),rgba(37,99,235,.08));border:1px solid #d7eef0}
    .section{padding:16px 0 2px}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:28px}
    .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}
    .adv-card,.case-card,.article-card,.review-card,.step,.network-box,.price-box,.timeline-box,.contact-box,.form-box,.compare{padding:22px}
    .adv-card h3,.case-card h3,.article-card h3,.review-card h3,.step h3{margin:10px 0 8px;font-size:18px}
    .adv-card p,.case-card p,.article-card p,.review-card p,.step p{margin:0;color:var(--muted)}
    .icon{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(37,99,235,.12),rgba(124,58,237,.12));color:#163c88;font-weight:800}
    .tags{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#304055;font-size:13px}
    .flow{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step{position:relative}
    .step:after{content:"";position:absolute;top:32px;right:-8px;width:16px;height:2px;background:#c5d3eb}
    .step:last-child:after{display:none}
    .compare{overflow:hidden}
    .table-wrap{overflow-x:auto}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:14px 12px;border-bottom:1px solid #e5ebf4;text-align:left;vertical-align:top}
    th{background:#f7faff;color:#183153;font-size:14px}
    .good{color:#0f766e;font-weight:700}
    .bad{color:#b45309}
    .rating{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#f7f3ff;color:#6d28d9;font-weight:700}
    .accordion{display:grid;gap:12px}
    .faq-item summary{list-style:none;cursor:pointer;padding:18px 22px;font-weight:700;display:flex;justify-content:space-between;gap:16px}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary:after{content:"＋";color:#3659b6}
    .faq-item[open] summary:after{content:"－"}
    .faq-item .faq-content{padding:0 22px 20px;color:var(--muted)}
    .reviews .review-card{display:grid;gap:12px}
    .avatar{width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,#dbeafe,#ede9fe);display:grid;place-items:center;font-weight:800;color:#22418f}
    .review-top{display:flex;align-items:center;gap:12px}
    .stars{color:#f59e0b;letter-spacing:2px}
    .article-card{display:flex;flex-direction:column;gap:12px}
    .article-list{display:grid;gap:12px}
    .article-link{padding:14px 16px;border:1px solid var(--line);border-radius:16px;background:#fff;color:var(--text)}
    .article-link:hover{border-color:#bfd1ff;background:#f7faff}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .field{display:grid;gap:8px}
    label{font-weight:700;font-size:14px}
    input,select,textarea{width:100%;border:1px solid #d8e0ec;border-radius:14px;padding:13px 14px;font:inherit;color:var(--text);background:#fff;outline:none}
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#6aa5ff;box-shadow:0 0 0 4px rgba(37,99,235,.10)}
    .footer{margin-top:20px;padding:22px 0 28px;background:#eff4fb;border-top:1px solid #dce3ef;color:#223247}
    .footer a{color:#1d4ed8}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px}
    .footer small{color:#526174}
    .floating{position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px}
    .float-btn{width:52px;height:52px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 12px 28px rgba(37,99,235,.25);border:0}
    .backtop{opacity:0;pointer-events:none;transform:translateY(10px);transition:.25s ease}
    .backtop.show{opacity:1;pointer-events:auto;transform:translateY(0)}
    .floating-panel{position:fixed;right:16px;bottom:78px;width:min(290px,calc(100vw - 32px));background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:14px;display:none;z-index:61}
    .floating-panel.show{display:block}
    .floating-panel h4{margin:0 0 10px}
    .qr{display:flex;gap:12px;align-items:center}
    .qr img{width:92px;height:92px;object-fit:cover;border-radius:14px;border:1px solid #e2e8f4}
    .muted{color:var(--muted)}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:grid;grid-template-columns:70px 1fr;gap:14px;align-items:start;padding:16px;border-radius:16px;background:#fff;border:1px solid var(--line)}
    .timeline-item b{color:#16419a}
    .banner-image{border-radius:18px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow)}
    .banner-image img{width:100%;height:auto}
    .wide-links{display:flex;flex-wrap:wrap;gap:10px}
    .wide-links a{padding:10px 12px;border-radius:12px;background:#fff;border:1px solid var(--line)}
    .service-net{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
    .network-box{min-height:100%}
    .flow-compact{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-2,.flow,.footer-grid,.service-net,.flow-compact{grid-template-columns:1fr}
      .hero-points,.side-metrics,.form-grid{grid-template-columns:1fr 1fr}
      .step:after{display:none}
      .section-head{align-items:flex-start;flex-direction:column}
    }
    @media (max-width: 760px){
      .nav-links,.nav-cta{display:none}
      .menu-btn{display:inline-flex}
      .mobile-menu{display:none;padding:0 0 18px}
      .mobile-menu.show{display:block}
      .mobile-menu a{display:block;padding:11px 0;color:var(--text);border-top:1px solid #edf1f7}
      .hero-main,.hero-side,.adv-card,.case-card,.article-card,.review-card,.step,.network-box,.price-box,.timeline-box,.contact-box,.form-box,.compare{padding:18px}
      .hero-points,.side-metrics,.form-grid{grid-template-columns:1fr}
      h1{font-size:28px}
      .section-head h2{font-size:24px}
    }
    .fade{opacity:0;transform:translateY(18px);transition:.65s ease}
    .fade.in{opacity:1;transform:translateY(0)}