:root{
      --bg:#f7f8fc;
      --panel:#ffffff;
      --panel-2:#f1f5ff;
      --text:#182033;
      --muted:#5e6a84;
      --line:#dfe5f2;
      --brand:#4f6ef7;
      --brand-2:#ff7a59;
      --brand-3:#10b981;
      --shadow:0 18px 40px rgba(24,32,51,.08);
      --radius:20px;
      --radius-sm:14px;
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:
      radial-gradient(circle at top left, rgba(79,110,247,.12), transparent 28%),
      radial-gradient(circle at 80% 0%, rgba(255,122,89,.10), transparent 24%),
      linear-gradient(180deg,#fbfcff 0%, #f7f8fc 100%);color:var(--text);line-height:1.7}
    a{color:inherit;text-decoration:none}
    img{max-width:100%;display:block}
    .container{max-width:var(--max);margin:0 auto;padding:0 18px}
    .site-header{position:sticky;top:0;z-index:50;background:rgba(247,248,252,.84);backdrop-filter:blur(14px);border-bottom:1px solid rgba(223,229,242,.8)}
    .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}
    .brand .ai-page-logo{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;padding:4px;box-shadow:0 10px 24px rgba(79,110,247,.12)}
    .brand strong{display:block;font-size:1.02rem;letter-spacing:.02em}
    .brand span{display:block;font-size:.82rem;color:var(--muted)}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;color:var(--text);border-radius:12px;padding:10px 12px}
    .nav-links{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:flex-end}
    .nav-links a{font-size:.92rem;color:var(--muted);padding:8px 10px;border-radius:999px;transition:.25s}
    .nav-links a:hover{background:#eef3ff;color:var(--text)}
    .nav-cta{background:linear-gradient(135deg,var(--brand),#6d7dff);color:#fff !important;box-shadow:0 10px 24px rgba(79,110,247,.22)}
    .hero{padding:34px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch}
    .hero-main,.hero-side,.card,.panel,.faq-item,.review-card,.article-card,.info-box,.form-card{background:var(--panel);border:1px solid rgba(223,229,242,.95);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-main{padding:32px;position:relative;overflow:hidden;background:
      linear-gradient(135deg, rgba(79,110,247,.10), rgba(255,122,89,.08)),
      #fff}
    .hero-main::before{content:"";position:absolute;inset:auto -40px -70px auto;width:240px;height:240px;border-radius:50%;background:radial-gradient(circle, rgba(16,185,129,.18), transparent 68%);pointer-events:none}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:#eef4ff;color:#3551cf;font-size:.84rem;font-weight:700}
    h1{margin:16px 0 14px;font-size:clamp(2rem,4vw,3.45rem);line-height:1.08;letter-spacing:-.03em}
    .hero-desc{font-size:1.02rem;color:var(--muted);max-width:62ch;margin:0 0 20px}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:20px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:14px;padding:13px 18px;font-weight:700;cursor:pointer;transition:.25s;min-height:48px}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#6f86ff);color:#fff;box-shadow:0 14px 26px rgba(79,110,247,.24)}
    .btn-secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
    .btn:hover,.nav-links a:hover,.card:hover,.review-card:hover,.article-card:hover,.faq-item:hover,.info-box:hover{transform:translateY(-2px)}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
    .point{padding:14px;border-radius:16px;background:rgba(255,255,255,.82);border:1px solid rgba(223,229,242,.9)}
    .point strong{display:block;font-size:1.02rem}
    .point span{display:block;color:var(--muted);font-size:.88rem}
    .hero-side{padding:20px;background:linear-gradient(180deg,#fff, #f7faff)}
    .quick-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .stat{padding:18px;border-radius:18px;background:var(--panel-2);border:1px solid #dde5fb}
    .stat b{display:block;font-size:1.35rem;margin-bottom:6px}
    section{padding:18px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:14px}
    .section-head h2{margin:0;font-size:1.65rem}
    .section-head p{margin:0;color:var(--muted);max-width:60ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .card{padding:20px}
    .card h3{margin:10px 0 8px;font-size:1.06rem}
    .card p,.panel p,.review-card p,.article-card p,.info-box p{margin:0;color:var(--muted)}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:#eef3ff;color:#4157cc;font-size:.8rem;font-weight:700}
    .pill-list{display:flex;flex-wrap:wrap;gap:10px}
    .pill{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#32405f;font-size:.88rem}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
    .panel{padding:22px}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line);position:relative}
    .step .num{display:inline-flex;width:30px;height:30px;align-items:center;justify-content:center;border-radius:10px;background:linear-gradient(135deg,var(--brand),#7a8dff);color:#fff;font-weight:800;margin-bottom:10px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f5f7ff;font-size:.92rem}
    td{color:#3d4a67}
    .highlight{color:#0f766e;font-weight:700}
    .compare-card{background:linear-gradient(180deg,#fff,#f8fbff)}
    .score{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:10px}
    .score strong{font-size:1.1rem}
    .timeline{display:grid;gap:12px}
    .timeline-item{display:grid;grid-template-columns:88px 1fr;gap:14px;padding:16px;border-radius:18px;background:#fff;border:1px solid var(--line)}
    .timeline-item time{font-weight:800;color:#4157cc}
    .reviews,.articles,.faq-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review-card,.article-card{padding:18px}
    .stars{color:#f59e0b;letter-spacing:1px;font-size:1.02rem}
    details.faq-item{padding:0;overflow:hidden}
    details summary{list-style:none;cursor:pointer;padding:18px 20px;font-weight:700}
    details summary::-webkit-details-marker{display:none}
    details .faq-body{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 var(--line);border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text);outline:none}
    textarea{min-height:126px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:#8ba0ff;box-shadow:0 0 0 4px rgba(79,110,247,.12)}
    .form-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:10px}
    .footer{margin-top:18px;background:#eef3ff;color:#1b2742;border-top:1px solid rgba(223,229,242,.95)}
    .footer a{color:#273e99}
    .footer-grid{display:grid;grid-template-columns:1.15fr .85fr 1fr;gap:16px;padding:28px 0}
    .footer small{color:#5d6880}
    .muted{color:var(--muted)}
    .anchor-list{display:flex;flex-wrap:wrap;gap:10px}
    .anchor-list a{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:.88rem;color:#31405f}
    .float-box{position:fixed;right:16px;bottom:16px;z-index:60;display:flex;flex-direction:column;gap:10px}
    .float-btn{display:inline-flex;align-items:center;justify-content:center;min-width:52px;min-height:52px;padding:0 16px;border-radius:999px;background:linear-gradient(135deg,var(--brand-2),#ff9c73);color:#fff;box-shadow:0 12px 24px rgba(255,122,89,.25);font-weight:700}
    .float-btn.secondary{background:linear-gradient(135deg,#1fb6a6,#14b8a6)}
    .fade-up{opacity:0;transform:translateY(18px);transition:.7s ease}
    .fade-up.show{opacity:1;transform:translateY(0)}
    .subtle-line{height:1px;background:linear-gradient(90deg,transparent,rgba(79,110,247,.26),transparent);margin:16px 0}
    .service-map{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
    .service-map span{padding:10px 12px;border-radius:14px;background:#fff;border:1px solid var(--line);text-align:center;font-size:.88rem}
    .thumbs{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .thumbs img,.wide-media img{border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow)}
    .wide-media{display:grid;grid-template-columns:1.2fr .8fr;gap:12px}
    .article-meta{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:.88rem;margin-bottom:10px}
    .nav-links.open{display:flex}
    .mobile-only{display:none}
    @media (max-width: 980px){
      .hero-grid,.split,.grid-3,.grid-4,.reviews,.articles,.faq-list,.footer-grid,.steps,.wide-media,.service-map{grid-template-columns:1fr}
      .hero-points,.quick-stats,.form-grid{grid-template-columns:1fr 1fr}
      .section-head{align-items:flex-start;flex-direction:column}
      .nav-toggle{display:inline-flex}
      .nav-links{display:none;position:absolute;left:18px;right:18px;top:72px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}
      .nav-links a{padding:12px 14px}
      .nav{position:relative}
      .mobile-only{display:inline-flex}
    }
    @media (max-width: 640px){
      .hero-main{padding:22px}
      .hero-points,.quick-stats,.form-grid{grid-template-columns:1fr}
      h1{font-size:1.9rem}
      .btn{width:100%}
      .form-actions .btn{width:100%}
      .float-box{right:12px;bottom:12px}
    }