:root{
      --bg:#f6f7fb;
      --card:#ffffff;
      --card2:#fbfcff;
      --text:#142033;
      --muted:#5f6b7a;
      --line:#e6eaf2;
      --primary:#4f6ef7;
      --primary2:#7a5cff;
      --accent:#13b8a6;
      --warm:#ffb84d;
      --shadow:0 18px 50px rgba(25,40,72,.08);
      --shadow2:0 10px 30px rgba(25,40,72,.06);
      --radius:20px;
      --radius2:14px;
      --container: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;
      color:var(--text);
      background:
        radial-gradient(circle at 12% 10%, rgba(79,110,247,.12), transparent 24%),
        radial-gradient(circle at 90% 4%, rgba(255,184,77,.12), transparent 18%),
        radial-gradient(circle at 85% 82%, rgba(19,184,166,.12), transparent 20%),
        linear-gradient(180deg, #f7f8fc 0%, #f3f6fb 100%);
      line-height:1.7;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--container), calc(100% - 32px)); margin:0 auto}
    .site-header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:saturate(160%) blur(14px);
      background:rgba(246,247,251,.82);
      border-bottom:1px solid rgba(230,234,242,.78);
    }
    .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;padding:6px;box-shadow:var(--shadow2)}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:16px;line-height:1.2}
    .brand-text span{display:block;font-size:12px;color:var(--muted)}
    .nav-links{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:10px}
    .nav-links a{font-size:14px;color:#31405a;padding:8px 10px;border-radius:999px;transition:.25s ease}
    .nav-links a:hover,.nav-links a:focus{background:#eef3ff;color:#2440c2;transform:translateY(-1px)}
    .nav-cta{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:999px;
      padding:12px 18px;font-weight:700;font-size:14px;cursor:pointer;
      transition:.25s ease;white-space:nowrap;
    }
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 12px 30px rgba(79,110,247,.22)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 36px rgba(79,110,247,.28)}
    .btn-soft{background:#fff;border-color:var(--line);color:#20304a}
    .btn-soft:hover{border-color:#cfd8ea;transform:translateY(-2px)}
    .menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;color:#20304a}
    .hero{
      padding:34px 0 14px;
    }
    .hero-grid{
      display:grid;grid-template-columns:1.18fr .82fr;gap:22px;align-items:stretch;
    }
    .hero-panel{
      border:1px solid rgba(230,234,242,.9);
      background:
        linear-gradient(135deg, rgba(79,110,247,.12), rgba(123,92,255,.08) 45%, rgba(19,184,166,.08)),
        rgba(255,255,255,.84);
      box-shadow:var(--shadow);
      border-radius:28px;
      padding:32px;
      position:relative;
      overflow:hidden;
    }
    .hero-panel::after{
      content:"";
      position:absolute;inset:auto -60px -80px auto;
      width:240px;height:240px;border-radius:50%;
      background:radial-gradient(circle, rgba(255,184,77,.35), rgba(255,184,77,0) 65%);
      pointer-events:none;
    }
    .eyebrow{
      display:inline-flex;align-items:center;gap:8px;
      padding:7px 12px;border-radius:999px;
      background:rgba(255,255,255,.84);border:1px solid rgba(230,234,242,.95);
      color:#31405a;font-size:13px;font-weight:700;
    }
    h1{margin:14px 0 12px;font-size:clamp(30px,4vw,54px);line-height:1.08;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:16px;max-width:58ch}
    .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:22px
    }
    .mini-stat{
      background:rgba(255,255,255,.9);
      border:1px solid rgba(230,234,242,.95);
      border-radius:18px;padding:16px;box-shadow:var(--shadow2)
    }
    .mini-stat strong{display:block;font-size:22px;line-height:1.15}
    .mini-stat span{color:var(--muted);font-size:13px}
    .hero-side{
      display:grid;gap:16px
    }
    .side-card{
      background:rgba(255,255,255,.9);
      border:1px solid rgba(230,234,242,.95);
      border-radius:24px;padding:22px;box-shadow:var(--shadow2)
    }
    .side-card h2,.section-title h2{margin:0 0 8px;font-size:clamp(22px,2.5vw,34px);line-height:1.15}
    .section-title p,.side-card p{margin:0;color:var(--muted)}
    .pill-cloud{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
    .pill{padding:8px 12px;border-radius:999px;background:#f2f5ff;border:1px solid #dfe6ff;color:#304270;font-size:13px}
    .quick-list{display:grid;gap:10px;margin-top:14px}
    .quick-item{display:flex;gap:10px;align-items:flex-start;padding:12px;border-radius:16px;background:#fbfcff;border:1px solid var(--line)}
    .dot{width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--primary))}
    .section{padding:22px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:18px;margin-bottom:16px}
    .section-head .tag{font-size:13px;font-weight:700;color:#405072}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .card{
      background:var(--card);border:1px solid var(--line);border-radius:22px;padding:20px;box-shadow:var(--shadow2);
      transition:.25s ease;
    }
    .card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
    .card h3{margin:0 0 8px;font-size:18px}
    .card p{margin:0;color:var(--muted)}
    .metric{font-size:30px;font-weight:800;line-height:1.05;margin-bottom:8px;background:linear-gradient(135deg,var(--primary),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
    .media-strip{
      display:grid;grid-template-columns:repeat(2,1fr);gap:12px
    }
    .media-strip .ai-page-image{
      width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:18px;border:1px solid var(--line);box-shadow:var(--shadow2);background:#fff
    }
    .process{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{
      position:relative;padding-top:18px
    }
    .step .index{
      width:38px;height:38px;border-radius:12px;display:grid;place-items:center;font-weight:800;color:#fff;
      background:linear-gradient(135deg,var(--primary),var(--primary2));box-shadow:0 12px 22px rgba(79,110,247,.22);
      margin-bottom:14px;
    }
    .compare-table{
      width:100%;border-collapse:separate;border-spacing:0;overflow:hidden;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:var(--shadow2)
    }
    .compare-wrap{overflow:auto}
    .compare-table th,.compare-table td{padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top;text-align:left;font-size:14px}
    .compare-table th{background:#f5f7ff;color:#23314d;font-size:13px;letter-spacing:.02em}
    .compare-table tr:last-child td{border-bottom:none}
    .check{color:#0f8c63;font-weight:700}
    .cross{color:#be4d4d;font-weight:700}
    .badge-star{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:999px;background:#fff7e7;border:1px solid #ffe2a8;color:#a66c00;font-weight:700}
    .review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px;color:var(--muted);font-size:13px}
    .quote{font-size:15px;color:#243449}
    .dual{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:start}
    .table-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
    .tag-chip{padding:9px 12px;border-radius:999px;background:#f4f7ff;border:1px solid #dbe4ff;color:#31405a;font-size:13px}
    .faq{display:grid;gap:12px}
    .faq-item{
      background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow2);overflow:hidden
    }
    .faq-q{
      width:100%;text-align:left;background:none;border:none;padding:16px 18px;font-size:15px;font-weight:700;color:#20304a;display:flex;justify-content:space-between;align-items:center;gap:16px;cursor:pointer
    }
    .faq-a{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 18px;color:var(--muted)}
    .faq-item.open .faq-a{max-height:180px;padding-bottom:16px}
    .faq-item.open .chev{transform:rotate(180deg)}
    .chev{transition:.25s ease;color:#5f6b7a}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
    .article a{display:block}
    .article .small{font-size:13px;color:var(--muted);margin-top:8px}
    .form-card form{display:grid;gap:12px}
    .fields{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .input, .select, .textarea{
      width:100%;border:1px solid var(--line);border-radius:14px;background:#fff;color:var(--text);
      padding:12px 14px;font:inherit;outline:none;transition:.2s ease
    }
    .textarea{min-height:120px;resize:vertical}
    .input:focus,.select:focus,.textarea:focus{border-color:#a9b8ff;box-shadow:0 0 0 4px rgba(79,110,247,.08)}
    .footer{
      margin-top:12px;padding:22px 0 34px;border-top:1px solid rgba(230,234,242,.9);background:rgba(246,247,251,.92)
    }
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:16px;align-items:start}
    .footer a{color:#2841b0}
    .footer a:hover{text-decoration:underline}
    .copyright{margin-top:14px;color:var(--muted);font-size:13px}
    .floating{
      position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px
    }
    .float-btn{
      width:48px;height:48px;border-radius:16px;border:none;cursor:pointer;color:#fff;
      background:linear-gradient(135deg,var(--primary),var(--accent));box-shadow:0 12px 24px rgba(19,184,166,.2)
    }
    .float-link{
      display:grid;place-items:center;width:48px;height:48px;border-radius:16px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow2)
    }
    .mobile-panel{display:none}
    [data-reveal]{opacity:0;transform:translateY(14px);transition:.65s ease}
    [data-reveal].in{opacity:1;transform:none}
    @media (max-width: 1024px){
      .hero-grid,.split,.dual,.footer-grid,.grid-4,.process,.review-grid,.articles{grid-template-columns:1fr 1fr}
      .hero-points{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-toggle{display:inline-flex}
      .mobile-panel{display:none;padding:0 0 14px}
      .mobile-panel.open{display:block}
      .mobile-panel .nav-links{display:flex;flex-direction:column;align-items:stretch}
      .mobile-panel .nav-links a{background:#fff;border:1px solid var(--line)}
      .hero{padding-top:20px}
    }
    @media (max-width: 720px){
      .container{width:min(var(--container), calc(100% - 22px))}
      .hero-panel{padding:22px;border-radius:22px}
      .grid-4,.split,.dual,.footer-grid,.hero-grid,.process,.review-grid,.articles,.fields{grid-template-columns:1fr}
      .section-head{align-items:flex-start;flex-direction:column}
      .nav{padding:12px 0}
      h1{font-size:30px}
      .btn{width:100%}
      .nav-cta{display:none}
      .mobile-panel .nav-cta{display:flex;flex-direction:column;align-items:stretch}
      .compare-table th,.compare-table td{padding:12px}
      .media-strip{grid-template-columns:1fr}
    }