:root{
      --bg:#f6f8fc;
      --card:#ffffff;
      --text:#1f2a37;
      --muted:#5f6b7a;
      --line:#e5eaf1;
      --brand:#2563eb;
      --brand2:#06b6d4;
      --accent:#f97316;
      --soft:#eef5ff;
      --shadow:0 16px 40px rgba(31,42,55,.08);
      --radius:22px;
      --radius-sm:16px;
      --max:1200px;
    }
    *{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;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(37,99,235,.08), transparent 30%),
        radial-gradient(circle at top right, rgba(6,182,212,.08), transparent 28%),
        linear-gradient(180deg, #fdfefe 0%, #f6f8fc 100%);
      min-width:320px;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max), calc(100% - 32px)); margin:0 auto}
    header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.86);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid rgba(229,234,241,.8)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:12px 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:cover;background:#fff;border:1px solid var(--line);box-shadow:0 10px 24px rgba(37,99,235,.08)}
    .brand h1{font-size:16px;line-height:1.2;margin:0}
    .brand p{margin:2px 0 0;color:var(--muted);font-size:12px}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;color:var(--text)}
    .menu{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
    .menu a{font-size:14px;color:var(--text);padding:8px 0;position:relative}
    .menu a::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:2px;background:linear-gradient(90deg,var(--brand),var(--brand2));transform:scaleX(0);transform-origin:left;transition:transform .25s ease}
    .menu a:hover::after{transform:scaleX(1)}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:999px;padding:13px 18px;font-weight:700;cursor:pointer;transition:.25s ease;box-shadow:none}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4f7cff);color:#fff;box-shadow:0 14px 30px rgba(37,99,235,.22)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 38px rgba(37,99,235,.26)}
    .btn-ghost{background:#fff;border:1px solid var(--line);color:var(--text)}
    .btn-ghost:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
    main{overflow:hidden}
    section{padding:58px 0}
    .hero{padding:30px 0 40px}
    .hero-wrap{
      display:grid;grid-template-columns:1.25fr .95fr;gap:22px;align-items:stretch
    }
    .hero-main,.hero-side,.panel,.card,.quote,.article,.compare,.timeline,.faq-item,.form-box,.support-box,.review{
      background:rgba(255,255,255,.9);
      border:1px solid rgba(229,234,241,.9);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-main{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--soft);color:#1d4ed8;border:1px solid #dbeafe;border-radius:999px;padding:8px 12px;font-size:13px;font-weight:700}
    .hero h2{font-size:clamp(32px,5vw,54px);line-height:1.06;margin:16px 0 14px}
    .hero h2 span{color:var(--brand)}
    .lead{color:var(--muted);font-size:16px;line-height:1.8;margin:0 0 20px;max-width:62ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:18px 0 22px}
    .hero-tags{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border-radius:999px;background:#f8fafc;border:1px solid var(--line);font-size:13px;color:#334155}
    .hero-side{padding:22px;display:grid;gap:14px}
    .side-top{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    .mini{padding:16px;border-radius:18px;background:linear-gradient(180deg,#f8fbff,#fff);border:1px solid var(--line)}
    .mini strong{display:block;font-size:20px;margin-bottom:6px}
    .mini span{color:var(--muted);font-size:13px;line-height:1.6}
    .side-copy{padding:16px;border-radius:18px;background:linear-gradient(135deg,#eef6ff,#f5fbff);border:1px solid #dbeafe}
    .side-copy h3{margin:0 0 8px;font-size:18px}
    .side-copy p{margin:0;color:var(--muted);line-height:1.75;font-size:14px}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:20px}
    .section-head h3{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);max-width:62ch;line-height:1.75}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .card{padding:22px}
    .card h4,.panel h4,.review h4,.support-box h4{margin:0 0 10px;font-size:18px}
    .card p,.panel p,.review p{margin:0;color:var(--muted);line-height:1.75}
    .icon{
      width:44px;height:44px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,rgba(37,99,235,.12),rgba(6,182,212,.12));
      color:var(--brand);font-weight:800;margin-bottom:14px
    }
    .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .stat{padding:22px;border-radius:22px;background:linear-gradient(180deg,#fff,#f9fbff);border:1px solid var(--line)}
    .stat strong{display:block;font-size:30px;line-height:1.1}
    .stat span{display:block;color:var(--muted);margin-top:8px;font-size:14px;line-height:1.6}
    .two-col{display:grid;grid-template-columns:1.08fr .92fr;gap:16px}
    .panel{padding:24px}
    .bullet{display:grid;gap:10px;margin:16px 0 0;padding:0;list-style:none}
    .bullet li{display:flex;gap:10px;align-items:flex-start;color:var(--text);line-height:1.7}
    .bullet i{width:22px;height:22px;border-radius:50%;background:#eaf2ff;color:#2563eb;display:inline-grid;place-items:center;font-style:normal;font-size:12px;flex:none;margin-top:3px}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step{padding:20px;border-radius:20px;background:#fff;border:1px solid var(--line);position:relative}
    .step b{display:inline-flex;width:34px;height:34px;border-radius:12px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;align-items:center;justify-content:center;margin-bottom:12px}
    .step h4{margin:0 0 8px}
    .table-wrap{overflow-x:auto;border-radius:22px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:900px}
    th,td{padding:16px 18px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;font-size:14px;line-height:1.7}
    th{background:#f8fbff;color:#1e293b}
    tr:last-child td{border-bottom:none}
    .badge{display:inline-flex;align-items:center;padding:6px 10px;border-radius:999px;background:#ecfdf5;color:#047857;font-size:12px;font-weight:700}
    .compare-highlight{font-size:22px;font-weight:800;color:#0f172a}
    .timeline{padding:22px}
    .timeline ol{list-style:none;padding:0;margin:0;display:grid;gap:12px}
    .timeline li{display:grid;grid-template-columns:82px 1fr;gap:12px;align-items:start;padding:14px;border-radius:16px;background:#fbfdff;border:1px solid var(--line)}
    .timeline time{font-weight:800;color:#2563eb}
    .faq-list{display:grid;gap:12px}
    .faq-item{padding:0;overflow:hidden}
    .faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:18px 20px;background:transparent;border:none;color:var(--text);font-size:16px;font-weight:700;cursor:pointer;text-align:left}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s ease;color:var(--muted);padding:0 20px}
    .faq-item.open .faq-a{max-height:200px;padding:0 20px 18px}
    .faq-q span:last-child{transition:transform .25s ease}
    .faq-item.open .faq-q span:last-child{transform:rotate(45deg)}
    .reviews .review{padding:20px}
    .review .meta{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:10px}
    .stars{color:#f59e0b;font-weight:800;letter-spacing:1px}
    .form-box{padding:24px}
    form{display:grid;gap:14px}
    .form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
    label{display:grid;gap:8px;font-size:14px;color:#334155;font-weight:700}
    input,select,textarea{
      width:100%;padding:13px 14px;border-radius:14px;border:1px solid #dbe2eb;background:#fff;color:var(--text);
      outline:none;transition:border-color .2s, box-shadow .2s;font:inherit
    }
    input:focus,select:focus,textarea:focus{border-color:#60a5fa;box-shadow:0 0 0 4px rgba(59,130,246,.12)}
    textarea{min-height:120px;resize:vertical}
    .support-box{padding:22px}
    .contact-list{display:grid;gap:10px;margin:16px 0 0;padding:0;list-style:none}
    .contact-list li{display:flex;gap:10px;align-items:flex-start;color:var(--text);line-height:1.7}
    .contact-list i{font-style:normal;color:var(--brand);font-weight:800}
    .floating{
      position:fixed;right:18px;bottom:18px;z-index:50;display:grid;gap:10px
    }
    .float-btn{width:52px;height:52px;border-radius:18px;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 16px 30px rgba(37,99,235,.25);border:none;cursor:pointer}
    .float-panel{
      position:fixed;right:18px;bottom:84px;z-index:50;width:min(320px, calc(100vw - 36px));
      background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:16px;display:none
    }
    .float-panel.open{display:block}
    .qr{display:grid;grid-template-columns:92px 1fr;gap:14px;align-items:center}
    .qr img{width:92px;height:92px;object-fit:cover;border-radius:16px;border:1px solid var(--line);background:#fff}
    footer{padding:26px 0 30px;border-top:1px solid var(--line);background:#f8fafc;color:#334155}
    footer a{color:#0f172a}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:16px;align-items:start}
    .link-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .link-cloud a,.footer-mini a,.home-link{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line)}
    .muted{color:var(--muted)}
    .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease, transform .6s ease}
    .reveal.show{opacity:1;transform:none}
    .article-list{display:grid;gap:12px}
    .article{padding:18px 20px;display:flex;justify-content:space-between;gap:14px;align-items:center}
    .article small{color:var(--muted);display:block;margin-top:4px}
    .article strong{display:block;margin-bottom:4px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#334155}
    .price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .price{padding:22px;border-radius:22px;background:#fff;border:1px solid var(--line)}
    .price .num{font-size:30px;font-weight:900;color:var(--brand)}
    .price ul{list-style:none;padding:0;margin:14px 0 0;display:grid;gap:10px;color:var(--muted)}
    .sticky-subnav{display:none}
    .home-link{display:inline-flex}
    @media (max-width: 1024px){
      .hero-wrap,.two-col,.grid-4,.grid-3,.stats,.steps,.price-grid,.footer-grid{grid-template-columns:1fr 1fr}
      .grid-4,.stats,.steps,.price-grid{grid-template-columns:repeat(2,1fr)}
      .hero-wrap,.two-col{grid-template-columns:1fr}
    }
    @media (max-width: 768px){
      .nav-toggle{display:inline-flex}
      .menu{
        display:none;position:absolute;left:16px;right:16px;top:72px;padding:14px;background:#fff;border:1px solid var(--line);
        border-radius:18px;box-shadow:var(--shadow);flex-direction:column;align-items:flex-start;gap:6px
      }
      .menu.open{display:flex}
      .menu a{padding:10px 0;width:100%}
      .section-head{flex-direction:column;align-items:flex-start}
      .grid-4,.grid-3,.grid-2,.stats,.steps,.price-grid,.form-grid,.footer-grid,.side-top{grid-template-columns:1fr}
      .hero-main{padding:24px}
      section{padding:46px 0}
      .article{flex-direction:column;align-items:flex-start}
      .timeline li{grid-template-columns:1fr}
      .faq-item.open .faq-a{max-height:320px}
    }