:root{--bg:#f6f8fc;--panel:#ffffff;--panel2:#fef9ef;--text:#1f2a37;--muted:#5b6574;--line:#e6ebf2;--brand:#ff7a18;--brand2:#ffb347;--brand3:#2c67f2;--shadow:0 18px 45px rgba(27,45,94,.10)}
    *{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;background:linear-gradient(180deg,#fff 0%,#f8fbff 18%,#f6f8fc 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}
    header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.88);backdrop-filter:blur(10px);border-bottom:1px solid rgba(230,235,242,.85)}
    .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 20px rgba(0,0,0,.06)}
    .brand b{display:block;font-size:18px;line-height:1.1}
    .brand span{display:block;font-size:12px;color:var(--muted);margin-top:3px}
    .menu{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .menu a{font-size:14px;color:#334155;padding:8px 10px;border-radius:999px;transition:.2s}
    .menu a:hover{background:#eef4ff;color:#173a8a}
    .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:.22s;box-shadow:none}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#ff9d3d);color:#fff;box-shadow:0 14px 28px rgba(255,122,24,.24)}
    .btn-secondary{background:#fff;border-color:var(--line);color:#17324d}
    .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
    .burger{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;width:44px;height:44px;align-items:center;justify-content:center}
    .burger span{display:block;width:18px;height:2px;background:#20304a;position:relative}
    .burger span:before,.burger span:after{content:"";position:absolute;left:0;width:18px;height:2px;background:#20304a}
    .burger span:before{top:-6px}.burger span:after{top:6px}
    .hero{position:relative;overflow:hidden;padding:34px 0 22px;background:radial-gradient(circle at 15% 20%,rgba(255,183,85,.18),transparent 30%),radial-gradient(circle at 85% 0%,rgba(44,103,242,.14),transparent 26%),linear-gradient(180deg,#ffffff 0%,#f8fbff 100%)}
    .hero:before,.hero:after{content:"";position:absolute;border-radius:999px;filter:blur(2px);opacity:.7;animation:float 10s ease-in-out infinite}
    .hero:before{width:160px;height:160px;right:8%;top:8%;background:radial-gradient(circle,#ffe3b6 0%,rgba(255,227,182,0) 72%)}
    .hero:after{width:220px;height:220px;left:-40px;bottom:-80px;background:radial-gradient(circle,#cfe0ff 0%,rgba(207,224,255,0) 70%);animation-delay:-2s}
    @keyframes float{50%{transform:translateY(10px)}}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;align-items:stretch}
    h1{font-size:clamp(30px,4vw,54px);line-height:1.05;margin:14px 0 14px;letter-spacing:-.02em}
    .hero p{font-size:16px;line-height:1.8;color:var(--muted);margin:0 0 22px;max-width:62ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:18px}
    .hero-pills{display:flex;flex-wrap:wrap;gap:10px}
    .pill{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:#334155;font-size:13px}
    .hero-card{background:linear-gradient(180deg,#fff 0%,#fff8ee 100%);border:1px solid rgba(255,193,115,.35);border-radius:24px;padding:22px;box-shadow:var(--shadow)}
    .metrics{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
    .metric{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px;transition:.2s}
    .metric:hover{transform:translateY(-3px)}
    .metric strong{display:block;font-size:28px;line-height:1;color:#111827}
    .metric span{display:block;font-size:13px;color:var(--muted);margin-top:6px;line-height:1.45}
    .section{padding:18px 0 8px}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:clamp(24px,2.4vw,34px)}
    .section-head p{margin:0;color:var(--muted);max-width:68ch;line-height:1.7}
    .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{background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:0 10px 26px rgba(22,36,72,.05);transition:.2s}
    .card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted);line-height:1.75}
    .badge{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border-radius:999px;background:#eef4ff;color:#1e3a8a;font-size:12px;font-weight:700}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border:1px solid var(--line);border-radius:999px;background:#fff;color:#334155;font-size:13px}
    .panel-soft{background:linear-gradient(180deg,#ffffff 0%,#fffaf1 100%);border:1px solid rgba(255,186,92,.28)}
    table{width:100%;border-collapse:separate;border-spacing:0;overflow:hidden;border:1px solid var(--line);border-radius:18px;background:#fff}
    th,td{padding:14px 14px;border-bottom:1px solid var(--line);vertical-align:top;text-align:left;font-size:14px;line-height:1.65}
    th{background:#f8fbff;color:#183153}
    tr:last-child td{border-bottom:none}
    .table-wrap{overflow:auto;border-radius:18px}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step{position:relative}
    .step .num{display:inline-flex;width:34px;height:34px;border-radius:50%;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--brand3),#7aa3ff);color:#fff;font-weight:800;margin-bottom:12px}
    .review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review{background:linear-gradient(180deg,#fff 0%,#fffdf8 100%);border:1px solid var(--line);border-radius:20px;padding:18px}
    .review .who{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:10px}
    .stars{color:#f59e0b;letter-spacing:1px}
    .faq details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 16px}
    .faq details+details{margin-top:12px}
    .faq summary{cursor:pointer;font-weight:700;list-style:none}
    .faq summary::-webkit-details-marker{display:none}
    .faq p{margin:10px 0 0;color:var(--muted);line-height:1.75}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article a{display:block;color:#17324d;font-weight:700;margin-top:10px}
    .form-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:16px}
    form{display:grid;gap:12px}
    input,select,textarea{width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:14px;background:#fff;color:#1f2937;font:inherit}
    textarea{min-height:120px;resize:vertical}
    .footer-top{padding:18px 0 30px}
    footer{border-top:1px solid var(--line);background:#f8fbff;color:#243244;margin-top:16px}
    footer a{color:#173a8a}
    .foot{display:grid;grid-template-columns:1.1fr .9fr;gap:16px;padding:24px 0}
    .copyright{padding:14px 0 24px;color:#5b6574;font-size:13px}
    .floating{position:fixed;right:16px;bottom:18px;z-index:60;display:grid;gap:10px}
    .floating a,.floating button{width:48px;height:48px;border-radius:16px;border:1px solid var(--line);background:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 24px rgba(15,23,42,.12);cursor:pointer}
    .float-text{position:absolute;right:56px;top:50%;transform:translateY(-50%);background:#111827;color:#fff;padding:8px 10px;border-radius:10px;font-size:12px;white-space:nowrap;opacity:0;pointer-events:none;transition:.2s}
    .floating a:hover .float-text,.floating button:hover .float-text{opacity:1}
    .mobile-only{display:none}
    .reveal{opacity:0;transform:translateY(18px);transition:.6s ease}
    .reveal.in{opacity:1;transform:none}
    .compare-badge{display:flex;gap:12px;flex-wrap:wrap;margin-top:12px}
    .compare-score{background:linear-gradient(135deg,#fff5e7,#fff);border:1px solid rgba(255,170,75,.4);padding:14px 16px;border-radius:18px}
    .compare-score strong{display:block;font-size:26px;color:#0f172a}
    .compare-score span{color:var(--muted);font-size:13px}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-2,.steps,.review-grid,.articles,.form-grid,.foot{grid-template-columns:1fr}
      .menu{display:none}
      .burger{display:inline-flex}
      .mobile-only{display:flex}
    }
    .mobile-nav{display:none;padding:0 0 14px}
    .mobile-nav.open{display:block}
    .mobile-nav .menu{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
    .mobile-nav .menu a{background:#fff;border:1px solid var(--line);border-radius:12px;text-align:center}