:root{
      --bg:#f7f8fc;
      --bg2:#fffaf3;
      --card:#ffffff;
      --text:#1f2a37;
      --muted:#5e6b7b;
      --line:#e6ebf2;
      --brand:#2f6bff;
      --brand2:#7c4dff;
      --accent:#ff8a3d;
      --shadow:0 14px 40px rgba(25,40,80,.10);
      --shadow2:0 10px 24px rgba(47,107,255,.14);
      --radius:22px;
      --max: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 top left, rgba(47,107,255,.12), transparent 28%),
        radial-gradient(circle at top right, rgba(255,138,61,.12), transparent 24%),
        linear-gradient(180deg, var(--bg), #ffffff 36%, #f9fbff 100%);
    }
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{max-width:var(--max);margin:0 auto;padding:0 20px}
    .site-header{
      position:sticky;top:0;z-index:50;
      backdrop-filter:saturate(160%) blur(14px);
      background:rgba(247,248,252,.82);
      border-bottom:1px solid rgba(230,235,242,.9);
    }
    .nav{
      display:flex;align-items:center;justify-content:space-between;gap:16px;
      min-height:72px;
    }
    .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;padding:4px;box-shadow:0 8px 18px rgba(31,42,55,.08)}
    .brand-text{display:flex;flex-direction:column;line-height:1.1;min-width:0}
    .brand-text strong{font-size:18px;letter-spacing:.4px}
    .brand-text span{font-size:12px;color:var(--muted);margin-top:4px;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:14px;color:#334155;padding:8px 0;position:relative}
    .nav-links a::after{
      content:"";position:absolute;left:0;bottom:2px;width:0;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--brand),var(--brand2));transition:.25s ease;
    }
    .nav-links a:hover::after,.nav-links a.active::after{width:100%}
    .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;
      box-shadow:none;white-space:nowrap;
    }
    .btn-primary{color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:var(--shadow2)}
    .btn-primary:hover{transform:translateY(-2px);filter:saturate(1.06)}
    .btn-ghost{color:var(--text);background:rgba(255,255,255,.9);border-color:var(--line)}
    .btn-ghost:hover{border-color:#cfd8e6;transform:translateY(-2px)}
    .menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:14px;padding:10px 12px;color:var(--text)}
    .hero{
      position:relative;overflow:hidden;
      padding:38px 0 24px;
    }
    .hero::before{
      content:"";position:absolute;inset:0;
      background:
        linear-gradient(135deg, rgba(47,107,255,.11), transparent 34%),
        linear-gradient(315deg, rgba(124,77,255,.10), transparent 26%);
      pointer-events:none;
    }
    .hero-grid{
      position:relative;
      display:grid;grid-template-columns:1.2fr .8fr;gap:26px;align-items:stretch;
    }
    .hero-copy,.hero-panel,.section-card,.feature-card,.review-card,.faq-item,.article-card,.metric,.price-card,.case-card,.train-card,.compare-card,.form-card,.timeline-card,.tag-cloud,.network-card{
      background:rgba(255,255,255,.82);
      border:1px solid rgba(230,235,242,.95);
      border-radius:var(--radius);
      box-shadow:var(--shadow);
    }
    .hero-copy{padding:34px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:#2453d6;background:#eef4ff;border:1px solid #dbe6ff;border-radius:999px;padding:8px 12px}
    h1{font-size:clamp(30px,5vw,52px);line-height:1.08;margin:16px 0 14px}
    .hero p{color:var(--muted);font-size:16px;line-height:1.8;margin:0}
    .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:24px 0 18px}
    .hero-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:20px}
    .mini-stat{padding:14px 14px 12px;border-radius:18px;background:linear-gradient(180deg,#fdfefe,#f4f7ff);border:1px solid #e7ecf5}
    .mini-stat strong{display:block;font-size:22px}
    .mini-stat span{display:block;color:var(--muted);font-size:13px;margin-top:4px;line-height:1.5}
    .hero-panel{padding:24px;display:flex;flex-direction:column;gap:16px;justify-content:space-between}
    .panel-top{display:flex;justify-content:space-between;align-items:center;gap:12px}
    .panel-badge{font-size:12px;padding:8px 10px;border-radius:999px;background:linear-gradient(135deg,rgba(47,107,255,.12),rgba(255,138,61,.12));color:#1f3f94;font-weight:700}
    .panel-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
    .panel-item{padding:14px;border-radius:18px;background:linear-gradient(180deg,#fff,#f8fbff);border:1px solid #e8edf7}
    .panel-item strong{display:block;font-size:16px;margin-bottom:6px}
    .panel-item span{color:var(--muted);font-size:13px;line-height:1.6}
    .section{padding:18px 0}
    .section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;margin-bottom:16px}
    .section-head h2{font-size:28px;margin:0}
    .section-head p{margin:0;color:var(--muted);line-height:1.7;max-width:66ch}
    .section-card{padding:24px}
    .grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
    .metric{padding:18px}
    .metric .value{font-size:30px;font-weight:800;background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
    .metric .label{display:block;font-size:14px;font-weight:700;margin-top:6px}
    .metric .desc{display:block;font-size:13px;color:var(--muted);margin-top:8px;line-height:1.6}
    .feature-card,.review-card,.case-card,.train-card,.compare-card,.article-card,.price-card,.faq-item,.form-card,.timeline-card,.network-card,.tag-cloud{padding:20px}
    .feature-card h3,.review-card h3,.case-card h3,.train-card h3,.compare-card h3,.article-card h3,.price-card h3,.faq-item summary,.form-card h3,.timeline-card h3,.network-card h3{margin:0 0 10px;font-size:18px}
    .feature-card p,.review-card p,.case-card p,.train-card p,.compare-card p,.article-card p,.price-card p,.timeline-card p,.network-card p,.form-card p{margin:0;color:var(--muted);line-height:1.75}
    .icon{
      width:42px;height:42px;border-radius:14px;display:grid;place-items:center;
      background:linear-gradient(135deg,rgba(47,107,255,.12),rgba(255,138,61,.12));
      margin-bottom:14px;font-weight:800;color:#2149a4
    }
    .chips{display:flex;flex-wrap:wrap;gap:10px}
    .chip{font-size:13px;padding:9px 12px;border-radius:999px;background:#f5f7fb;border:1px solid #e5ebf4;color:#334155}
    .timeline{display:grid;gap:14px}
    .step{display:grid;grid-template-columns:42px 1fr;gap:14px;align-items:start}
    .step .num{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:800;display:grid;place-items:center;box-shadow:var(--shadow2)}
    .step h3{margin:0 0 6px;font-size:17px}
    .compare-wrap{overflow:auto;border-radius:18px;border:1px solid #e5ebf4}
    table{width:100%;border-collapse:collapse;background:#fff;min-width:760px}
    th,td{padding:16px 14px;border-bottom:1px solid #edf1f7;text-align:left;vertical-align:top}
    th{background:#f7f9ff;font-size:14px}
    td{font-size:14px;color:#334155;line-height:1.7}
    .score{font-weight:800;color:#1f3f94}
    .badge-good{display:inline-flex;padding:6px 10px;border-radius:999px;background:#edf7ff;color:#1456a9;font-size:12px;font-weight:700}
    .faq-list{display:grid;gap:12px}
    .faq-item{padding:0;overflow:hidden}
    .faq-item summary{list-style:none;padding:18px 20px;cursor:pointer;position:relative}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item summary::after{content:"+";position:absolute;right:20px;top:16px;font-size:22px;color:#7b8794}
    .faq-item[open] summary::after{content:"–"}
    .faq-content{padding:0 20px 18px;color:var(--muted);line-height:1.8}
    .quote{display:flex;flex-direction:column;gap:12px}
    .quote .stars{color:#f59e0b;font-size:18px;letter-spacing:2px}
    .quote footer{background:none;padding:0;color:#334155;font-weight:700}
    .article-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
    .article-card .meta{font-size:12px;color:#6b7280;margin-bottom:10px}
    .article-card a.more{display:inline-flex;margin-top:12px;color:#2453d6;font-weight:700}
    .contact-grid{display:grid;grid-template-columns:1fr .92fr;gap:16px}
    .form{display:grid;gap:12px}
    .field{display:grid;gap:8px}
    .field label{font-size:14px;font-weight:700;color:#334155}
    .field input,.field select,.field textarea{
      width:100%;border:1px solid #dbe3ee;border-radius:14px;padding:12px 14px;font:inherit;color:var(--text);background:#fff;outline:none;transition:.2s ease;
    }
    .field input:focus,.field select:focus,.field textarea:focus{border-color:#7da1ff;box-shadow:0 0 0 4px rgba(47,107,255,.10)}
    .field textarea{min-height:126px;resize:vertical}
    .sidebar-stack{display:grid;gap:16px}
    .kv{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:center;padding:14px;border-radius:18px;background:#f8fbff;border:1px solid #e8edf7}
    .kv strong{display:block}
    .kv span{display:block;color:var(--muted);font-size:13px;line-height:1.6}
    .footer{
      margin-top:16px;
      background:#0f172a;
      color:#e5eefc;
      padding:26px 0 18px;
    }
    .footer a{color:#cfe1ff}
    .footer-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:16px}
    .footer .muted{color:#a9b8d1;line-height:1.8}
    .footer-bottom{margin-top:16px;padding-top:14px;border-top:1px solid rgba(255,255,255,.08);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:#a9b8d1;font-size:13px}
    .floating{
      position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px;
    }
    .floating a,.floating button{
      width:48px;height:48px;border-radius:16px;border:0;display:grid;place-items:center;cursor:pointer;
      box-shadow:var(--shadow);background:#fff;color:#1f2a37
    }
    .floating .primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff}
    .mobile-only{display:none}
    .reveal{opacity:0;transform:translateY(16px);transition:.55s ease}
    .reveal.visible{opacity:1;transform:none}
    .top-tags{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:9px 12px;border-radius:999px;background:#f5f7fb;border:1px solid #e5ebf4;font-size:13px}
    @media (max-width: 1024px){
      .hero-grid,.contact-grid,.footer-grid,.grid-3,.article-list,.grid-2{grid-template-columns:1fr}
      .hero-points{grid-template-columns:1fr}
      .section-head{align-items:flex-start;flex-direction:column}
    }
    @media (max-width: 860px){
      .nav-links,.nav-cta{display:none}
      .menu-toggle{display:inline-flex}
      .mobile-only{display:block}
      .nav.open .nav-links,.nav.open .nav-cta{
        display:flex;position:absolute;left:20px;right:20px;top:76px;padding:14px;background:rgba(255,255,255,.98);
        border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch;
      }
      .nav.open .nav-cta{top:auto;bottom:auto;margin-top:12px}
      .nav{position:relative;flex-wrap:wrap}
      .hero-copy{padding:24px}
      .hero-panel{padding:18px}
      .panel-grid{grid-template-columns:1fr}
      .grid-3{grid-template-columns:1fr}
    }