:root{
      --bg:#f6f2ea;
      --bg2:#eef4ff;
      --card:#ffffff;
      --line:#d9e2f2;
      --text:#1d2939;
      --muted:#5b6b84;
      --primary:#2d6cff;
      --primary2:#8d5bff;
      --accent:#ff8a5b;
      --accent2:#1fbf9a;
      --shadow:0 18px 40px rgba(29,41,57,.10);
      --radius:22px;
      --radius2:16px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--text);background:
      radial-gradient(circle at top left, rgba(141,91,255,.10), transparent 30%),
      radial-gradient(circle at top right, rgba(45,108,255,.10), transparent 28%),
      linear-gradient(180deg, #fff 0%, var(--bg) 38%, #f7fbff 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}
    .topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.80);backdrop-filter:blur(12px);border-bottom:1px solid rgba(217,226,242,.8)}
    .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;box-shadow:0 8px 20px rgba(29,41,57,.08)}
    .brand-text{min-width:0}
    .brand-text strong{display:block;font-size:1rem;letter-spacing:.5px}
    .brand-text span{display:block;font-size:.82rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:.92rem;color:#31415c;padding:8px 10px;border-radius:999px;transition:.25s}
    .nav-links a:hover{background:#eef4ff;color:var(--primary)}
    .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;transition:.25s;cursor:pointer;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;box-shadow:0 12px 24px rgba(45,108,255,.22)}
    .btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 30px rgba(45,108,255,.28)}
    .btn-ghost{background:#fff;color:var(--text);border-color:var(--line)}
    .btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:14px;width:44px;height:44px;align-items:center;justify-content:center}
    .menu-btn span{display:block;width:18px;height:2px;background:#344054;position:relative}
    .menu-btn span:before,.menu-btn span:after{content:"";position:absolute;left:0;width:18px;height:2px;background:#344054}
    .menu-btn span:before{top:-6px}.menu-btn span:after{top:6px}
    .hero{padding:34px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-main,.hero-side,.section-card,.feature-card,.review-card,.faq-item,.news-card,.timeline-card,.compare-card,.form-card,.deal-card,.stat-card,.value-card,.mini-card{background:var(--card);border:1px solid rgba(217,226,242,.9);box-shadow:var(--shadow);border-radius:var(--radius)}
    .hero-main{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#eef4ff;color:var(--primary);font-weight:700;font-size:.88rem}
    h1{font-size:clamp(2rem,4vw,3.5rem);line-height:1.08;margin:16px 0 14px}
    .lead{font-size:1.05rem;color:var(--muted);max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:22px 0 18px}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}
    .point{padding:14px;border-radius:18px;background:linear-gradient(180deg,#fff, #f8fbff);border:1px solid var(--line)}
    .point strong{display:block;font-size:1.05rem}
    .point span{display:block;color:var(--muted);font-size:.9rem}
    .hero-side{padding:20px;display:grid;gap:14px}
    .hero-side .promo{
      border-radius:20px;padding:18px;background:linear-gradient(135deg,rgba(45,108,255,.10),rgba(141,91,255,.10),rgba(255,138,91,.10));
      border:1px solid rgba(45,108,255,.12)
    }
    .promo h2{font-size:1.1rem;margin:0 0 8px}
    .promo p{margin:0;color:var(--muted)}
    .hero-side .ai-page-image{border-radius:18px;border:1px solid var(--line)}
    .section{padding:18px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:clamp(1.4rem,2.2vw,2rem)}
    .section-head p{margin:0;color:var(--muted);max-width:60ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .stat-card,.feature-card,.value-card,.review-card,.news-card,.deal-card,.timeline-card,.compare-card,.form-card,.faq-item{padding:20px}
    .stat-card strong{display:block;font-size:1.7rem;margin-bottom:6px}
    .stat-card span{color:var(--muted)}
    .section-card{padding:24px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:9px 12px;border-radius:999px;background:#f3f7ff;border:1px solid #dbe6ff;color:#345;}
    .features-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .feature-card h3,.value-card h3,.review-card h3,.news-card h3,.deal-card h3,.timeline-card h3{margin:0 0 10px;font-size:1.06rem}
    .feature-card p,.value-card p,.review-card p,.news-card p,.deal-card p,.timeline-card p{margin:0;color:var(--muted)}
    .feature-card ul{margin:12px 0 0;padding-left:18px;color:#344054}
    .steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .step{padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff,#f8fbff);border:1px solid var(--line)}
    .step b{display:inline-flex;width:34px;height:34px;border-radius:10px;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff;margin-bottom:10px}
    .table-wrap{overflow:auto;border-radius:20px;border:1px solid var(--line);background:#fff}
    table{width:100%;border-collapse:collapse;min-width:820px}
    th,td{padding:14px 16px;border-bottom:1px solid #edf2fb;text-align:left;vertical-align:top}
    th{background:#f7faff;color:#20304a}
    tr:hover td{background:#fbfdff}
    .compare-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:16px}
    .score-box{padding:22px;border-radius:20px;background:linear-gradient(135deg,#eef4ff,#fff4ef);border:1px solid #e8efff}
    .score-box .big{font-size:2.2rem;font-weight:800;color:var(--primary)}
    .review-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .review-card .meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}
    .stars{color:#ffb400;letter-spacing:2px}
    .article-list{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article-list a{display:block}
    .news-card .date{font-size:.88rem;color:var(--muted);margin-bottom:8px}
    .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    .form-grid .full{grid-column:1/-1}
    label{display:block;font-weight:700;margin:0 0 8px}
    input,select,textarea{width:100%;border:1px solid var(--line);border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text);outline:none}
    input:focus,select:focus,textarea:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(45,108,255,.10)}
    textarea{min-height:120px;resize:vertical}
    .faq-list{display:grid;gap:12px}
    .faq-item summary{list-style:none;cursor:pointer;font-weight:700}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item p{margin:12px 0 0;color:var(--muted)}
    .footer{margin-top:18px;padding:28px 0 22px;background:linear-gradient(180deg,#ffffff,#f6f9ff);border-top:1px solid var(--line);color:#20304a}
    .footer a{color:#1f5cff}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr .9fr;gap:20px}
    .footer small,.footer p{color:#53657f}
    .contact-card{display:grid;gap:12px}
    .qr{width:148px;border-radius:18px;border:1px solid var(--line);box-shadow:0 10px 24px rgba(29,41,57,.08)}
    .float-tools{position:fixed;right:16px;bottom:18px;z-index:60;display:grid;gap:10px}
    .float-tools a,.backtop{width:48px;height:48px;border-radius:16px;display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);color:var(--primary);font-weight:800}
    .backtop{cursor:pointer}
    .mobile-only{display:none}
    .fade-in{opacity:0;transform:translateY(18px);transition:.6s ease}
    .fade-in.show{opacity:1;transform:none}
    @media (max-width: 960px){
      .hero-grid,.compare-grid,.footer-grid,.grid-4,.grid-3,.steps,.article-list,.review-grid,.features-list{grid-template-columns:1fr 1fr}
    }
    @media (max-width: 720px){
      .nav{flex-wrap:wrap}
      .menu-btn{display:inline-flex}
      .nav-links{display:none;order:3;width:100%;padding:10px 0 4px}
      .nav-links.open{display:flex}
      .nav-links a{padding:8px 0}
      .nav-cta{margin-left:auto}
      .hero-grid,.compare-grid,.footer-grid,.grid-4,.grid-3,.steps,.article-list,.review-grid,.features-list{grid-template-columns:1fr}
      .hero-main,.hero-side,.section-card{padding:20px}
      .hero-points{grid-template-columns:1fr}
      .form-grid{grid-template-columns:1fr}
      .mobile-only{display:block}
      .desktop-only{display:none}
    }