:root{
      --bg:#f6f8fc;
      --panel:#ffffff;
      --panel-2:#f3f7ff;
      --text:#162033;
      --muted:#5f6b84;
      --line:#dce5f5;
      --brand:#2f6bff;
      --brand2:#7a4dff;
      --accent:#10c6b8;
      --accent2:#ffb14a;
      --shadow:0 16px 40px rgba(26,52,114,.12);
      --shadow-soft:0 10px 24px rgba(26,52,114,.08);
      --radius:22px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
      background:
        radial-gradient(circle at 10% 10%, rgba(47,107,255,.10), transparent 22%),
        radial-gradient(circle at 90% 0%, rgba(122,77,255,.12), transparent 20%),
        radial-gradient(circle at 70% 20%, rgba(16,198,184,.08), transparent 20%),
        linear-gradient(180deg,#f8fbff 0%, #f4f7fd 100%);
      color:var(--text);
      line-height:1.7;
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%;height:auto}
    .container{
      width:min(var(--container), calc(100% - 32px));
      margin:0 auto;
    }
    .site-header{
      position:sticky;
      top:0;
      z-index:50;
      backdrop-filter:blur(14px);
      background:rgba(246,248,252,.82);
      border-bottom:1px solid rgba(220,229,245,.75);
    }
    .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 img{width:42px;height:42px;object-fit:contain}
    .brand strong{display:block;font-size:16px;line-height:1.1}
    .brand 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 14px;
      font-size:14px;
    }
    .nav-links a{
      color:#2a3550;
      padding:8px 10px;
      border-radius:999px;
      transition:.25s ease;
    }
    .nav-links a:hover{background:#eaf1ff;color:#1645b8}
    .nav-cta{
      display:flex;align-items:center;gap:10px;flex-shrink:0;
    }
    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      gap:8px;
      border:0;
      border-radius:999px;
      padding:12px 18px;
      font-weight:700;
      cursor:pointer;
      transition:.25s ease;
      box-shadow:none;
      white-space:nowrap;
    }
    .btn-primary{
      color:#fff;
      background:linear-gradient(135deg,var(--brand),var(--brand2));
      box-shadow:0 10px 24px rgba(47,107,255,.28);
    }
    .btn-secondary{
      color:#16305f;
      background:#eef4ff;
      border:1px solid #d8e4ff;
    }
    .btn:hover{transform:translateY(-2px);filter:saturate(1.02)}
    .menu-btn{
      display:none;
      width:44px;height:44px;
      border-radius:14px;
      border:1px solid #dbe5f6;
      background:#fff;
      color:#26324d;
    }
    .hero{
      padding:34px 0 18px;
    }
    .hero-grid{
      display:grid;
      grid-template-columns:1.18fr .82fr;
      gap:22px;
      align-items:stretch;
    }
    .hero-main,.hero-side,.section-card,.metric,.feature,.step,.case,.review,.faq-item,.compare,.article,.form-card,.timeline-item,.price-card,.network-card{
      background:rgba(255,255,255,.88);
      border:1px solid rgba(220,229,245,.9);
      box-shadow:var(--shadow-soft);
      border-radius:var(--radius);
    }
    .hero-main{
      padding:30px;
      overflow:hidden;
      position:relative;
      min-height:420px;
    }
    .hero-main::before,.hero-main::after{
      content:"";
      position:absolute;
      border-radius:999px;
      filter:blur(2px);
      pointer-events:none;
    }
    .hero-main::before{
      width:240px;height:240px;
      right:-70px;top:-70px;
      background:radial-gradient(circle, rgba(47,107,255,.18), transparent 70%);
    }
    .hero-main::after{
      width:180px;height:180px;
      right:40px;bottom:-60px;
      background:radial-gradient(circle, rgba(16,198,184,.16), transparent 70%);
    }
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:8px;
      padding:8px 12px;
      border-radius:999px;
      background:linear-gradient(135deg,rgba(47,107,255,.1),rgba(122,77,255,.1));
      color:#2746b3;
      font-size:13px;
      font-weight:700;
    }
    h1{
      margin:18px 0 14px;
      font-size:clamp(32px,5vw,54px);
      line-height:1.08;
      letter-spacing:-.02em;
    }
    .hero p{
      margin:0;
      color:var(--muted);
      font-size:16px;
      max-width:56ch;
    }
    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      margin-top:24px;
    }
    .hero-points{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:12px;
      margin-top:26px;
    }
    .mini{
      padding:14px 14px 12px;
      border-radius:18px;
      background:linear-gradient(180deg,#f8fbff, #eef4ff);
      border:1px solid #dce6f7;
    }
    .mini strong{display:block;font-size:15px}
    .mini span{display:block;color:var(--muted);font-size:13px;margin-top:4px}
    .hero-side{
      padding:24px;
      display:grid;
      gap:14px;
      align-content:start;
    }
    .logo-card{
      display:flex;
      gap:14px;
      align-items:center;
      padding:16px;
      background:linear-gradient(135deg,#f6f9ff,#eef3ff);
      border:1px solid #dbe6fb;
      border-radius:18px;
    }
    .logo-card img{width:56px;height:56px;object-fit:contain;border-radius:14px;background:#fff;padding:6px;border:1px solid #e3eaf8}
    .logo-card strong{display:block;font-size:18px}
    .logo-card p{margin:4px 0 0;color:var(--muted);font-size:13px}
    .stats{
      display:grid;
      grid-template-columns:repeat(2,minmax(0,1fr));
      gap:12px;
    }
    .metric{
      padding:16px;
      background:linear-gradient(180deg,#fff,#f7faff);
    }
    .metric b{display:block;font-size:24px;line-height:1}
    .metric span{display:block;color:var(--muted);font-size:13px;margin-top:8px}
    .side-note{
      padding:16px;
      background:linear-gradient(135deg,rgba(47,107,255,.08),rgba(16,198,184,.08));
      border-radius:18px;
      border:1px solid #d6e6fb;
      color:#274060;
      font-size:14px;
    }
    .section{padding:18px 0}
    .section-head{
      display:flex;
      align-items:end;
      justify-content:space-between;
      gap:16px;
      margin-bottom:14px;
    }
    .section-head h2{
      margin:0;
      font-size:28px;
      line-height:1.15;
    }
    .section-head p{margin:0;color:var(--muted);max-width:68ch}
    .section-card{padding:24px}
    .intro-grid,.feature-grid,.case-grid,.review-grid,.article-grid,.network-grid,.price-grid,.timeline{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:16px;
    }
    .feature,.case,.review,.article,.network-card,.price-card{
      padding:18px;
      transition:transform .25s ease, box-shadow .25s ease;
    }
    .feature:hover,.case:hover,.review:hover,.article:hover,.network-card:hover,.price-card:hover,.step:hover,.metric:hover{
      transform:translateY(-4px);
      box-shadow:var(--shadow);
    }
    .feature h3,.case h3,.review h3,.article h3,.network-card h3,.price-card h3,.step h3{margin:0 0 8px;font-size:18px}
    .feature p,.case p,.review p,.article p,.network-card p,.price-card p,.step p{margin:0;color:var(--muted)}
    .chip-row,.tag-cloud{
      display:flex;flex-wrap:wrap;gap:8px;margin-top:14px
    }
    .chip,.tag{
      display:inline-flex;align-items:center;gap:6px;
      padding:7px 10px;
      border-radius:999px;
      background:#eef4ff;
      border:1px solid #dce7fb;
      color:#24458f;
      font-size:12px;
    }
    .section-grid-2{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:16px;
    }
    .steps{
      display:grid;
      grid-template-columns:repeat(4,minmax(0,1fr));
      gap:16px;
    }
    .step{
      padding:18px;
      position:relative;
    }
    .step::before{
      content:attr(data-step);
      position:absolute;
      top:16px;right:16px;
      font-size:12px;
      font-weight:800;
      color:#2a57d6;
      background:#eaf1ff;
      padding:6px 10px;
      border-radius:999px;
    }
    .compare-wrap{overflow:auto}
    table{
      width:100%;
      border-collapse:separate;
      border-spacing:0;
      min-width:840px;
    }
    th,td{
      padding:14px 12px;
      text-align:left;
      border-bottom:1px solid var(--line);
      vertical-align:top;
      background:#fff;
    }
    th{
      background:#f4f7ff;
      color:#203150;
      font-size:14px;
    }
    tr:first-child th:first-child{border-top-left-radius:16px}
    tr:first-child th:last-child{border-top-right-radius:16px}
    .badge{
      display:inline-flex;
      padding:5px 9px;
      border-radius:999px;
      background:linear-gradient(135deg,rgba(47,107,255,.12),rgba(122,77,255,.12));
      color:#2450c4;
      font-size:12px;
      font-weight:700;
    }
    .faq-list{display:grid;gap:12px}
    .faq-item{
      padding:0;
      overflow:hidden;
    }
    .faq-q{
      width:100%;
      background:transparent;
      border:0;
      color:var(--text);
      padding:18px 18px;
      display:flex;
      justify-content:space-between;
      align-items:center;
      cursor:pointer;
      font-size:16px;
      font-weight:700;
      text-align:left;
    }
    .faq-a{
      max-height:0;
      overflow:hidden;
      transition:max-height .35s ease;
      padding:0 18px;
      color:var(--muted);
    }
    .faq-item.active .faq-a{
      max-height:220px;
      padding-bottom:18px;
    }
    .faq-icon{
      width:30px;height:30px;border-radius:50%;
      display:grid;place-items:center;
      background:#eef4ff;color:#2d58da;
      flex-shrink:0;
      transition:transform .25s ease;
    }
    .faq-item.active .faq-icon{transform:rotate(45deg)}
    .review .meta{
      display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px
    }
    .stars{color:#f2a700;letter-spacing:2px;font-size:15px}
    .article time{display:block;color:#7a859d;font-size:12px;margin-bottom:8px}
    .form-grid{
      display:grid;
      grid-template-columns:1fr 1fr;
      gap:14px;
    }
    .field{display:grid;gap:8px}
    .field label{font-size:14px;font-weight:700;color:#25314b}
    .field input,.field select,.field textarea{
      width:100%;
      border:1px solid #d8e3f4;
      background:#fbfcff;
      border-radius:14px;
      padding:13px 14px;
      color:var(--text);
      outline:none;
      font:inherit;
    }
    .field textarea{min-height:120px;resize:vertical}
    .field input:focus,.field select:focus,.field textarea:focus{border-color:#7aa1ff;box-shadow:0 0 0 4px rgba(47,107,255,.10)}
    .form-actions{
      display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:14px
    }
    .footer{
      margin-top:18px;
      padding:24px 0 34px;
      border-top:1px solid rgba(220,229,245,.8);
      color:#26324d;
    }
    .footer-grid{
      display:grid;
      grid-template-columns:1.3fr 1fr 1fr;
      gap:18px;
      align-items:start;
    }
    .footer a{color:#274fb7}
    .small{font-size:13px;color:var(--muted)}
    .floating{
      position:fixed;
      right:18px;
      bottom:18px;
      z-index:40;
      display:grid;
      gap:10px;
    }
    .float-btn{
      width:54px;height:54px;border-radius:18px;
      border:1px solid #dbe5f6;
      background:#fff;
      box-shadow:var(--shadow-soft);
      display:grid;place-items:center;
      cursor:pointer;
    }
    .backtop{font-size:18px;color:#2446b5}
    .float-kefu{
      position:absolute;
      right:64px;
      bottom:0;
      width:220px;
      background:#fff;
      border:1px solid #dce6f7;
      box-shadow:var(--shadow);
      border-radius:18px;
      padding:14px;
      display:none;
    }
    .floating.open .float-kefu{display:block}
    .float-kefu img{width:100%;border-radius:14px;margin-top:10px}
    .mobile-only{display:none}
    .center-note{
      margin-top:12px;
      padding:14px 16px;
      background:#f2f6ff;
      border:1px solid #dbe5fb;
      border-radius:16px;
      color:#33507f;
      font-size:14px;
    }
    .timeline .timeline-item{padding:18px}
    .timeline-item .tag{margin-bottom:10px}
    .case-grid .case .cover{
      display:flex;
      gap:12px;
      margin-top:14px;
      align-items:center;
    }
    .case-grid .case .cover img{
      width:88px;height:88px;border-radius:18px;object-fit:cover;border:1px solid #dde6f7;
    }
    .compare-card{
      display:grid;
      gap:16px;
    }
    .rating-box{
      display:grid;
      grid-template-columns:1fr auto;
      gap:16px;
      align-items:center;
      padding:18px;
      border-radius:18px;
      background:linear-gradient(135deg,rgba(47,107,255,.08),rgba(16,198,184,.08));
      border:1px solid #d7e4fb;
    }
    .rating-score{font-size:34px;font-weight:900;color:#203a88}
    .scroll-hint{font-size:13px;color:var(--muted);margin-top:8px}
    .sticky-home{
      color:#fff;
      background:linear-gradient(135deg,var(--accent),#2eb7ff);
      box-shadow:0 10px 24px rgba(16,198,184,.25);
    }
    @media (max-width: 1024px){
      .hero-grid,.section-grid-2,.footer-grid,.intro-grid,.feature-grid,.case-grid,.review-grid,.article-grid,.network-grid,.price-grid,.steps,.timeline{grid-template-columns:1fr 1fr}
      .hero-main{min-height:auto}
    }
    @media (max-width: 768px){
      .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;
        flex-direction:column;
        align-items:stretch;
        padding:14px;
        background:#fff;
        border:1px solid #dce5f5;
        border-radius:18px;
        box-shadow:var(--shadow);
      }
      .hero-grid,.section-grid-2,.footer-grid,.intro-grid,.feature-grid,.case-grid,.review-grid,.article-grid,.network-grid,.price-grid,.steps,.timeline,.hero-points,.form-grid{grid-template-columns:1fr}
      .hero-main,.hero-side,.section-card{padding:20px}
      .section-head{flex-direction:column;align-items:start}
      .mobile-only{display:inline-flex}
      .desktop-only{display:none}
      h1{font-size:31px}
      .floating{right:12px;bottom:12px}
      .float-kefu{right:0;bottom:66px;width:min(300px, calc(100vw - 24px))}
      .stats{grid-template-columns:1fr 1fr}
      .hero-points{margin-top:18px}
      .hero-actions{gap:10px}
    }