:root{--bg:#f6f8fc;--panel:#ffffff;--panel2:#f2f6ff;--text:#172033;--muted:#5f6b85;--line:#dbe3f1;--brand:#1b67ff;--brand2:#17b8a6;--accent:#ffb23f;--shadow:0 18px 50px rgba(28,56,126,.10);--radius:22px;}
    *{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;background:linear-gradient(180deg,#f8fbff 0%,#f4f7fb 45%,#f7f9fc 100%);color:var(--text)}
    a{color:inherit;text-decoration:none} img{display:block;max-width:100%}
    .container{width:min(1180px,calc(100% - 32px));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:50;background:rgba(248,251,255,.86);backdrop-filter:saturate(180%) blur(18px);border-bottom:1px solid rgba(219,227,241,.75)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
    .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;border:1px solid var(--line);padding:4px;box-shadow:0 8px 18px rgba(20,46,104,.08)}
    .brand-text{display:flex;flex-direction:column;line-height:1.2}
    .brand-text strong{font-size:18px}
    .brand-text span{font-size:12px;color:var(--muted)}
    .menu{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:flex-end}
    .menu a{font-size:14px;color:#24314c;padding:9px 12px;border-radius:999px;transition:.2s ease}
    .menu a:hover{background:#eaf1ff;color:var(--brand)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:14px;padding:12px 16px;font-weight:700;cursor:pointer;transition:.2s ease;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#3c8bff);color:#fff;box-shadow:0 12px 24px rgba(27,103,255,.22)}
    .btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 30px rgba(27,103,255,.26)}
    .btn-ghost{background:#fff;border-color:var(--line);color:#26324a}
    .btn-ghost:hover{border-color:#b9c7e2;transform:translateY(-1px)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 12px}
    .hero{padding:42px 0 20px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px;align-items:stretch}
    .hero-copy,.hero-side,.card,.section,.table-wrap,.faq-item,.review,.timeline li,.contact-box,.price-card,.value-card,.compare-card,.article-card{background:var(--panel);border:1px solid rgba(219,227,241,.9);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-copy{padding:34px;position:relative;overflow:hidden}
    .hero-copy:before,.hero-copy:after{content:"";position:absolute;border-radius:999px;background:radial-gradient(circle,rgba(27,103,255,.14),rgba(27,103,255,0) 70%);pointer-events:none}
    .hero-copy:before{width:280px;height:280px;right:-90px;top:-70px}
    .hero-copy:after{width:220px;height:220px;left:-80px;bottom:-80px;background:radial-gradient(circle,rgba(23,184,166,.12),rgba(23,184,166,0) 70%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#eef5ff;color:#1853c8;font-weight:700;font-size:13px}
    h1{margin:16px 0 14px;font-size:clamp(32px,5vw,54px);line-height:1.06;letter-spacing:-.04em}
    .lead{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:60ch}
    .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}
    .point{padding:14px 14px 12px;border-radius:18px;background:linear-gradient(180deg,#f7faff,#edf4ff);border:1px solid #dbe7ff}
    .point strong{display:block;font-size:18px;color:#15356d}
    .point span{font-size:13px;color:var(--muted)}
    .hero-side{padding:18px;display:grid;gap:14px}
    .side-top{padding:18px;border-radius:18px;background:linear-gradient(135deg,#0f2c67,#1958d5);color:#fff}
    .side-top h2{margin:0 0 8px;font-size:22px}
    .side-top p{margin:0;color:rgba(255,255,255,.86);line-height:1.7}
    .mini-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .mini{padding:16px;border-radius:18px;background:#f8fbff;border:1px solid var(--line)}
    .mini strong{display:block;font-size:18px;margin-bottom:6px}
    .mini span{color:var(--muted);font-size:13px;line-height:1.5}
    .section{padding:28px;margin-top:18px}
    .section-title{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:18px}
    .section-title h2{margin:0;font-size:clamp(24px,3vw,34px)}
    .section-title p{margin:0;color:var(--muted);max-width:62ch;line-height:1.7}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .card{padding:18px}
    .card h3{margin:6px 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted);line-height:1.7}
    .icon{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#eaf2ff,#dff7f3);color:var(--brand);font-weight:900}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:10px 12px;border-radius:999px;background:#f4f7fc;border:1px solid var(--line);color:#24314c;font-size:14px}
    .process{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
    .step{padding:18px;border-radius:20px;background:linear-gradient(180deg,#fff,#f6f9ff);border:1px solid var(--line);position:relative}
    .step:after{content:"";position:absolute;right:16px;top:16px;width:30px;height:30px;border-radius:10px;background:#eaf1ff}
    .step strong{display:block;font-size:18px;margin-bottom:8px}
    .step p{margin:0;color:var(--muted);line-height:1.7}
    .table-wrap{overflow:auto}
    table{width:100%;border-collapse:collapse;min-width:820px;background:#fff}
    th,td{padding:14px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f5f8ff;color:#1d2b45}
    td{color:#41506d}
    .rating{display:flex;align-items:center;gap:8px;font-weight:700;color:#1d3f8f}
    .stars{color:#ffb23f;font-size:18px;letter-spacing:2px}
    .compare-card{padding:20px}
    .compare-top{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:start}
    .compare-list{display:grid;gap:10px;margin:16px 0 0;padding:0;list-style:none}
    .compare-list li{display:flex;gap:10px;align-items:flex-start;color:var(--muted);line-height:1.6}
    .compare-list i{width:20px;height:20px;border-radius:50%;background:#e8f8f5;color:#178776;display:inline-grid;place-items:center;font-style:normal;font-size:12px;flex:0 0 auto;margin-top:2px}
    .timeline{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;list-style:none;padding:0;margin:0}
    .timeline li{padding:18px}
    .timeline .num{display:inline-flex;width:34px;height:34px;border-radius:12px;align-items:center;justify-content:center;background:#edf4ff;color:var(--brand);font-weight:800;margin-bottom:12px}
    .reviews,.articles,.faq,.contact-grid,.footer-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .review{padding:18px}
    .review .meta{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
    .review .role{color:var(--brand);font-weight:700;font-size:14px}
    .review p{margin:0;color:var(--muted);line-height:1.8}
    .faq-item details{padding:16px 18px}
    .faq-item summary{cursor:pointer;font-weight:700;list-style:none}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item p{margin:10px 0 0;color:var(--muted);line-height:1.75}
    .contact-box,.article-card,.price-card{padding:18px}
    .form{display:grid;gap:12px}
    .field{display:grid;gap:8px}
    .field label{font-size:14px;font-weight:700;color:#22304b}
    .field input,.field select,.field textarea{width:100%;border:1px solid var(--line);border-radius:14px;padding:12px 14px;background:#fff;color:var(--text);outline:none;transition:.2s ease;font:inherit}
    .field input:focus,.field select:focus,.field textarea:focus{border-color:#8fb2ff;box-shadow:0 0 0 4px rgba(27,103,255,.08)}
    .field textarea{min-height:120px;resize:vertical}
    .footer{margin-top:18px;padding:22px 0 28px;color:#22304b}
    .footer-inner{padding:22px;border-radius:24px;background:#f5f8fe;border:1px solid var(--line)}
    .footer a{color:#1a58d4}
    .muted{color:var(--muted)}
    .floating{position:fixed;right:18px;bottom:18px;z-index:40;display:grid;gap:10px}
    .float-btn{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),#4e9bff);color:#fff;box-shadow:0 14px 26px rgba(27,103,255,.24)}
    .float-btn.secondary{background:linear-gradient(135deg,var(--brand2),#36d0bf)}
    .reveal{opacity:0;transform:translateY(18px);transition:.55s ease}
    .reveal.show{opacity:1;transform:none}
    .articles .article-card h3{margin:0 0 10px;font-size:18px}
    .article-card p{margin:0;color:var(--muted);line-height:1.7}
    .article-card .meta{margin-top:12px;font-size:13px;color:#72809d}
    .small-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
    .price-card strong{display:block;font-size:24px;margin:8px 0;color:#14356d}
    .price-card .note{color:var(--muted);line-height:1.7}
    .topline{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
    .brand-badge{padding:8px 10px;border-radius:999px;background:#eaf5ff;color:#1a5ad4;font-size:13px;font-weight:700}
    @media (max-width: 980px){
      .hero-grid,.compare-top,.grid-4,.grid-3,.process,.timeline,.reviews,.articles,.faq,.contact-grid,.footer-grid,.small-grid{grid-template-columns:1fr}
      .menu{display:none}.menu.open{display:flex;flex-direction:column;align-items:flex-start;padding:12px 0 6px}
      .menu-toggle{display:inline-grid;place-items:center}
      .nav{flex-wrap:wrap}
      .nav-actions{margin-left:auto}
      .hero-copy{padding:24px}
      .hero-points{grid-template-columns:1fr}
      .mini-grid{grid-template-columns:1fr}
    }