:root{
      --bg:#f6f7fb;
      --panel:#ffffff;
      --panel-2:#fdf7ef;
      --text:#172033;
      --muted:#5f6b85;
      --line:#e7e9f2;
      --primary:#ff4d5f;
      --primary-2:#6c63ff;
      --accent:#ffb703;
      --good:#18a058;
      --shadow:0 18px 50px rgba(22,34,72,.08);
      --radius:20px;
      --radius-sm:14px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;background:radial-gradient(circle at top left, rgba(108,99,255,.10), transparent 28%), radial-gradient(circle at top right, rgba(255,77,95,.10), transparent 22%), var(--bg);color:var(--text);line-height:1.65}
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{max-width:var(--container);margin:0 auto;padding:0 20px}
    .site-header{position:sticky;top:0;z-index:50;background:rgba(246,247,251,.82);backdrop-filter:blur(14px);border-bottom:1px solid rgba(231,233,242,.9)}
    .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:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;box-shadow:0 10px 25px rgba(15,23,42,.08);padding:6px}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:16px;letter-spacing:.4px}
    .brand-text span{display:block;font-size:12px;color:var(--muted)}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#33405d;padding:8px 10px;border-radius:999px;transition:.25s}
    .nav-links a:hover,.nav-links a.active{background:rgba(255,77,95,.10);color:var(--primary)}
    .nav-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:12px;padding:10px 12px;font-size:14px;color:var(--text)}
    .hero{padding:34px 0 16px}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:22px;align-items:stretch}
    .hero-main{background:linear-gradient(135deg,#ffffff 0%,#fff7f8 55%,#f6f5ff 100%);border:1px solid rgba(231,233,242,.95);border-radius:28px;padding:34px;box-shadow:var(--shadow);position:relative;overflow:hidden}
    .hero-main:before,.hero-main:after{content:"";position:absolute;border-radius:999px;pointer-events:none}
    .hero-main:before{right:-60px;top:-50px;width:180px;height:180px;background:radial-gradient(circle, rgba(255,77,95,.22), transparent 65%)}
    .hero-main:after{right:70px;bottom:-70px;width:220px;height:220px;background:radial-gradient(circle, rgba(108,99,255,.18), transparent 62%)}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:rgba(255,77,95,.08);color:var(--primary);font-size:13px;font-weight:700}
    h1{margin:14px 0 12px;font-size:clamp(30px,5vw,54px);line-height:1.06;letter-spacing:-.02em}
    .lead{margin:0;color:#40506d;font-size:16px;max-width:64ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 18px;border-radius:14px;border:1px solid transparent;font-weight:700;transition:.25s;cursor:pointer}
    .btn-primary{background:linear-gradient(135deg,var(--primary),#ff7a18);color:#fff;box-shadow:0 14px 28px rgba(255,77,95,.22)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn:hover{transform:translateY(-2px)}
    .hero-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}
    .metric{background:rgba(255,255,255,.75);border:1px solid rgba(231,233,242,.95);border-radius:18px;padding:16px}
    .metric b{display:block;font-size:24px}
    .metric span{font-size:12px;color:var(--muted)}
    .hero-side{display:grid;gap:18px}
    .side-card,.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
    .side-card{padding:22px}
    .side-card h3,.section-head h2{margin:0 0 8px;font-size:24px}
    .side-card p{margin:0;color:var(--muted)}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
    .tag-cloud span{padding:8px 12px;border-radius:999px;background:#f4f6ff;color:#354061;font-size:13px;border:1px solid #e7ebff}
    .section{padding:22px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:14px;margin-bottom:16px}
    .section-head p{margin:0;color:var(--muted)}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .card{background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:0 10px 30px rgba(22,34,72,.05);transition:.25s}
    .card:hover{transform:translateY(-4px);box-shadow:0 18px 42px rgba(22,34,72,.09)}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted)}
    .icon-badge{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(255,77,95,.14),rgba(108,99,255,.14));color:var(--primary);font-weight:900;margin-bottom:14px}
    .panel-soft{background:linear-gradient(180deg,#fff,#fff7f2);border:1px solid rgba(255,191,168,.4)}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px}
    .list{margin:0;padding:0;list-style:none;display:grid;gap:12px}
    .list li{padding:12px 14px;background:#fbfcff;border:1px solid var(--line);border-radius:14px}
    .steps{counter-reset:step}
    .step{position:relative;padding-left:54px}
    .step:before{counter-increment:step;content:counter(step);position:absolute;left:0;top:0;width:36px;height:36px;border-radius:12px;background:linear-gradient(135deg,var(--primary-2),var(--primary));color:#fff;display:grid;place-items:center;font-weight:800}
    .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:820px}
    th,td{padding:16px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f8f9ff;color:#24314d;font-size:14px}
    td{color:#46526d;font-size:14px}
    .rating{display:flex;align-items:center;gap:10px;margin:10px 0 0}
    .stars{color:#ffb703;letter-spacing:2px;font-size:20px}
    .qna{display:grid;gap:12px}
    .faq-item{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden}
    .faq-q{width:100%;padding:16px 18px;border:0;background:transparent;color:var(--text);text-align:left;font-size:15px;font-weight:700;display:flex;justify-content:space-between;align-items:center;gap:12px}
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease,padding .28s ease;color:var(--muted);padding:0 18px}
    .faq-item.active .faq-a{max-height:220px;padding:0 18px 16px}
    .faq-item.active .faq-q .chev{transform:rotate(180deg)}
    .chev{transition:.25s}
    .testimonials,.articles,.gallery,.network{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .quote{font-size:15px;color:#35405a}
    .who{margin-top:12px;font-size:13px;color:var(--muted)}
    .article-item{display:flex;flex-direction:column;gap:10px}
    .article-item .meta{font-size:12px;color:var(--muted)}
    .article-item a{font-weight:700;color:#1b2540}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
    .form-group{display:flex;flex-direction:column;gap:8px}
    input,select,textarea{width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--text);font:inherit;outline:none}
    textarea{min-height:120px;resize:vertical}
    input:focus,select:focus,textarea:focus{border-color:rgba(255,77,95,.45);box-shadow:0 0 0 4px rgba(255,77,95,.08)}
    .footer{margin-top:10px;background:#111827;color:#f4f7ff;padding:26px 0 18px}
    .footer .container{display:grid;gap:18px}
    .footer a{color:#d7def7}
    .footer-top{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;align-items:start}
    .footer-note{color:#b8c1da;font-size:13px}
    .footer-links{display:flex;flex-wrap:wrap;gap:12px}
    .footer-links a{padding:8px 12px;background:rgba(255,255,255,.06);border-radius:999px}
    .fixed-actions{position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px}
    .float-btn{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 14px 30px rgba(26,39,84,.22);border:0;cursor:pointer}
    .floating-kefu{position:fixed;left:16px;bottom:16px;z-index:60;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow);width:160px}
    .floating-kefu img{width:100%;border-radius:12px;object-fit:cover}
    .fade-in{opacity:0;transform:translateY(16px);transition:.6s ease}
    .fade-in.show{opacity:1;transform:translateY(0)}
    .mini-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
    .mini-badges span{font-size:12px;color:#43506a;background:#f8f9ff;border:1px solid var(--line);padding:7px 10px;border-radius:999px}
    @media (max-width: 980px){
      .hero-grid,.grid-4,.grid-3,.split,.testimonials,.articles,.gallery,.network,.footer-top{grid-template-columns:1fr}
      .nav-links{display:none;position:absolute;left:20px;right:20px;top:68px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px;box-shadow:var(--shadow)}
      .nav-links.open{display:flex;flex-direction:column;align-items:flex-start}
      .nav-toggle{display:inline-flex}
      .form-grid{grid-template-columns:1fr}
      .hero-main{padding:26px}
      .hero-metrics{grid-template-columns:1fr}
      .floating-kefu{width:132px}
    }
    @media (max-width: 560px){
      .container{padding:0 16px}
      .hero-main{border-radius:22px}
      h1{font-size:28px}
      .btn{width:100%}
      .hero-actions{flex-direction:column}
      .fixed-actions{right:12px;bottom:12px}
    }