:root{
      --bg:#f5f8fd;
      --panel:#ffffff;
      --panel-2:#f8fbff;
      --text:#1f2a37;
      --muted:#5f6b7a;
      --brand:#2563eb;
      --brand-2:#14b8a6;
      --line:#dbe6f3;
      --shadow:0 14px 40px rgba(37,99,235,.08);
      --shadow-soft:0 8px 24px rgba(31,42,55,.08);
      --radius:20px;
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
      color:var(--text);
      background:
        radial-gradient(circle at top left, rgba(37,99,235,.10), transparent 28%),
        radial-gradient(circle at top right, rgba(20,184,166,.10), transparent 24%),
        linear-gradient(180deg, #f8fbff 0%, #f4f8fe 52%, #f7fbff 100%);
    }
    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:50;background:rgba(245,248,253,.84);backdrop-filter:blur(14px);border-bottom:1px solid rgba(219,230,243,.85)}
    .topbar{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 img{width:42px;height:42px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:4px}
    .brand .name{font-weight:800;letter-spacing:.5px}
    .brand .sub{font-size:12px;color:var(--muted);margin-top:2px}
    nav{display:flex;align-items:center;gap:14px}
    .nav-links{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#334155;padding:8px 10px;border-radius:999px;transition:.25s}
    .nav-links a:hover,.nav-links a.active{background:#eaf2ff;color:#1848c5}
    .nav-cta{display:flex;gap:10px;align-items:center}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:14px;padding:12px 16px;font-weight:700;cursor:pointer;transition:.25s;box-shadow:none}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#4f8df7);color:#fff;box-shadow:0 10px 24px rgba(37,99,235,.2)}
    .btn-primary:hover{transform:translateY(-1px);box-shadow:0 14px 30px rgba(37,99,235,.25)}
    .btn-ghost{background:#fff;border:1px solid var(--line);color:#1f3a68}
    .btn-ghost:hover{border-color:#b8cbef;transform:translateY(-1px)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;width:44px;height:44px}
    .menu-btn span{display:block;width:18px;height:2px;background:#334155;margin:4px auto;border-radius:2px}
    main{display:block}
    section{padding:28px 0}
    .hero{padding:32px 0 18px;position:relative;overflow:hidden}
    .hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;align-items:stretch}
    .hero-copy,.hero-side,.card,.panel{background:rgba(255,255,255,.92);border:1px solid rgba(219,230,243,.9);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-copy{padding:30px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#eaf6ff;color:#1661c0;font-weight:700;font-size:13px}
    h1{margin:16px 0 14px;font-size:clamp(30px,4vw,54px);line-height:1.05;letter-spacing:-.02em}
    .lead{margin:0;color:var(--muted);font-size:16px;line-height:1.8;max-width:58ch}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
    .hero-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}
    .mini{padding:14px;border-radius:16px;background:linear-gradient(180deg,#f8fbff,#fff);border:1px solid var(--line)}
    .mini strong{display:block;font-size:18px}
    .mini span{font-size:13px;color:var(--muted)}
    .hero-side{padding:22px;background:linear-gradient(180deg,#fdfefe,#eef6ff)}
    .orbit{position:relative;height:100%;min-height:320px;border-radius:18px;background:
      radial-gradient(circle at 30% 30%, rgba(37,99,235,.18), transparent 22%),
      radial-gradient(circle at 70% 20%, rgba(20,184,166,.18), transparent 18%),
      linear-gradient(180deg, #ffffff, #f4f9ff);border:1px solid var(--line);overflow:hidden}
    .orbit::before,.orbit::after{content:"";position:absolute;border-radius:999px;border:1px solid rgba(37,99,235,.18)}
    .orbit::before{width:240px;height:240px;top:-40px;right:-20px}
    .orbit::after{width:180px;height:180px;bottom:-36px;left:-14px}
    .orbit .box{position:absolute;left:20px;right:20px;padding:16px;border-radius:18px;background:rgba(255,255,255,.9);border:1px solid rgba(219,230,243,.95);box-shadow:var(--shadow-soft)}
    .orbit .b1{top:22px}
    .orbit .b2{top:128px}
    .orbit .b3{bottom:22px}
    .tagrow,.chip-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .chip{padding:9px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:13px;color:#2d3c52}
    .section-title{display:flex;justify-content:space-between;align-items:end;gap:14px;margin-bottom:16px}
    .section-title h2{margin:0;font-size:clamp(24px,2.6vw,34px)}
    .section-title p{margin:0;color:var(--muted);max-width:62ch;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{padding:18px}
    .card h3{margin:0 0 10px;font-size:18px}
    .card p,.card li{color:var(--muted);line-height:1.75}
    .icon{width:44px;height:44px;border-radius:14px;background:linear-gradient(135deg,#eaf2ff,#dff5f2);display:grid;place-items:center;color:#1d4ed8;font-weight:900;margin-bottom:12px}
    .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .stat{padding:18px;border-radius:18px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-soft)}
    .stat strong{display:block;font-size:24px}
    .stat span{color:var(--muted);font-size:13px}
    .timeline,.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .step{padding:18px;border-radius:18px;background:linear-gradient(180deg,#fff,#f7fbff);border:1px solid var(--line)}
    .step .num{display:inline-flex;width:34px;height:34px;border-radius:12px;background:#eaf2ff;color:#1d4ed8;align-items:center;justify-content:center;font-weight:800;margin-bottom:12px}
    .table-wrap{overflow:auto;border-radius:18px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow-soft)}
    table{width:100%;border-collapse:collapse;min-width:900px}
    th,td{padding:14px 16px;border-bottom:1px solid #e7eef7;text-align:left;vertical-align:top}
    th{background:#f7fbff;color:#183153;font-size:14px}
    td{color:#30415c}
    .rating{display:flex;align-items:center;gap:6px;color:#eab308;font-size:18px}
    .faq details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 16px;box-shadow:var(--shadow-soft)}
    .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}
    .reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .review .meta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
    .avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#dff5f2,#eaf2ff);display:grid;place-items:center;font-weight:800;color:#1f4eb7}
    .review small{color:var(--muted)}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .article a{color:#1848c5;font-weight:700}
    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;font-weight:700;color:#27364c}
    input,select,textarea{width:100%;border:1px solid var(--line);border-radius:14px;padding:12px 14px;font:inherit;background:#fff;color:var(--text);outline:none;transition:.2s}
    input:focus,select:focus,textarea:focus{border-color:#93b5f7;box-shadow:0 0 0 4px rgba(37,99,235,.08)}
    textarea{min-height:120px;resize:vertical}
    footer{background:#eef4fb;border-top:1px solid #d7e2f1;color:#233247;margin-top:10px}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:18px;padding:26px 0}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a,.footer-meta a{padding:8px 10px;border-radius:10px;background:#fff;border:1px solid var(--line);color:#1f3a68}
    .footer-bottom{padding:14px 0 24px;color:#5a687d;font-size:13px}
    .sticky-tools{position:fixed;right:16px;bottom:16px;display:grid;gap:10px;z-index:60}
    .tool{width:48px;height:48px;border-radius:16px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-soft);display:grid;place-items:center;color:#1d4ed8;font-weight:900}
    .float-kf{position:fixed;left:16px;bottom:16px;z-index:60}
    .float-kf .panel{padding:14px;max-width:260px}
    .mobile-only{display:none}
    .scroll-animate{opacity:0;transform:translateY(18px);transition:.55s ease}
    .scroll-animate.in{opacity:1;transform:none}
    .compare-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:10px}
    .badge{padding:8px 10px;border-radius:999px;background:#edf6ff;border:1px solid #d8e6fb;color:#1848c5;font-size:13px}
    @media (max-width: 980px){
      .hero-grid,.grid-3,.grid-2,.reviews,.articles,.footer-grid,.stats,.timeline,.steps{grid-template-columns:1fr 1fr}
      .hero-meta{grid-template-columns:1fr}
      .nav-links{display:none}
      .menu-btn{display:inline-grid;place-items:center}
      .nav-open .nav-links{display:flex;position:absolute;left:16px;right:16px;top:72px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-soft);flex-direction:column;align-items:flex-start}
      .nav-open .nav-cta{display:flex;position:absolute;right:16px;top:72px}
      .form-grid{grid-template-columns:1fr}
    }
    @media (max-width: 720px){
      section{padding:22px 0}
      .hero-copy,.hero-side,.card,.panel{border-radius:18px}
      .hero-grid,.grid-3,.grid-2,.reviews,.articles,.footer-grid,.stats,.timeline,.steps{grid-template-columns:1fr}
      .topbar{position:relative}
      .nav-cta .btn-ghost{display:none}
      .hero-copy{padding:22px}
      .hero-actions .btn{width:100%}
      .mobile-only{display:block}
      .sticky-tools,.float-kf{bottom:12px}
      .sticky-tools{right:12px}
      .float-kf{left:12px}
    }