:root{
      --bg:#f5fbff;
      --panel:#ffffff;
      --panel-2:#f8fbff;
      --text:#1f2a37;
      --muted:#5f6b7a;
      --line:#dbe7f2;
      --primary:#1570ef;
      --primary-2:#0ea5e9;
      --accent:#22c55e;
      --warm:#ffb020;
      --shadow:0 18px 50px rgba(17, 24, 39, .08);
      --shadow-soft:0 10px 24px rgba(17, 24, 39, .06);
      --radius:20px;
      --radius-sm:14px;
      --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;background:
      radial-gradient(circle at top left, rgba(21,112,239,.12), transparent 32%),
      radial-gradient(circle at 90% 10%, rgba(14,165,233,.12), transparent 22%),
      linear-gradient(180deg, #f8fcff 0%, #f5fbff 100%);color:var(--text);line-height:1.7}
    a{color:var(--primary);text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max), calc(100% - 32px));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:50;background:rgba(245,251,255,.84);backdrop-filter:blur(18px);border-bottom:1px solid rgba(219,231,242,.85)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:74px}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand img{width:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:4px}
    .brand strong{display:block;font-size:1.02rem}
    .brand span{display:block;font-size:.86rem;color:var(--muted)}
    .nav-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:.95rem;color:var(--text);padding:8px 0;opacity:.88}
    .nav-links a:hover,.nav-links a:focus{color:var(--primary)}
    .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:999px;padding:12px 18px;font-weight:700;transition:.25s ease;cursor:pointer;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;box-shadow:0 12px 28px rgba(21,112,239,.22)}
    .btn-secondary{background:#fff;border-color:var(--line);color:var(--text)}
    .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow-soft)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;color:var(--text)}
    .hero{padding:38px 0 24px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-main,.hero-side,.panel{background:linear-gradient(180deg,rgba(255,255,255,.96),rgba(248,251,255,.96));border:1px solid rgba(219,231,242,.92);border-radius:var(--radius);box-shadow:var(--shadow)}
    .hero-main{padding:34px;position:relative;overflow:hidden}
    .hero-main:before,.hero-main:after{content:"";position:absolute;border-radius:999px;background:radial-gradient(circle, rgba(21,112,239,.15), rgba(21,112,239,0) 68%)}
    .hero-main:before{width:280px;height:280px;right:-80px;top:-80px}
    .hero-main:after{width:220px;height:220px;right:70px;bottom:-100px}
    .kicker{display:inline-flex;align-items:center;gap:8px;background:rgba(21,112,239,.08);color:var(--primary);padding:8px 14px;border-radius:999px;font-weight:700;font-size:.92rem}
    h1{margin:16px 0 12px;font-size:clamp(2rem,4vw,3.7rem);line-height:1.12;letter-spacing:-.03em}
    .hero p{margin:0;color:var(--muted);font-size:1.04rem;max-width:62ch}
    .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-stat{background:rgba(248,251,255,.96);border:1px solid var(--line);border-radius:18px;padding:16px}
    .mini-stat strong{display:block;font-size:1.25rem}
    .mini-stat span{display:block;color:var(--muted);font-size:.92rem}
    .hero-side{padding:22px;display:grid;gap:14px;align-content:start}
    .side-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px}
    .side-card h3{margin:0 0 8px;font-size:1.02rem}
    .side-card p,.side-card li{color:var(--muted);margin:0}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{background:#eef6ff;border:1px solid #d7e8ff;color:#0f4fb8;padding:8px 12px;border-radius:999px;font-size:.9rem}
    section{padding:24px 0}
    .section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:1.65rem}
    .section-head p{margin:0;color:var(--muted)}
    .grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
    .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}
    .card{background:var(--panel);border:1px solid rgba(219,231,242,.92);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-soft);transition:.25s ease}
    .card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
    .card h3{margin:0 0 10px;font-size:1.08rem}
    .card p,.card li{color:var(--muted)}
    .icon-badge{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg, rgba(21,112,239,.12), rgba(14,165,233,.12));color:var(--primary);font-weight:800;margin-bottom:12px}
    .metric{font-size:1.8rem;font-weight:800;margin:4px 0}
    .subtle{color:var(--muted);font-size:.94rem}
    .timeline{display:grid;gap:14px}
    .step{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start}
    .step-num{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--primary-2));color:#fff;display:grid;place-items:center;font-weight:800;box-shadow:0 10px 18px rgba(21,112,239,.18)}
    .table-wrap{overflow-x:auto;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-soft)}
    table{width:100%;border-collapse:collapse;min-width:760px}
    th,td{padding:16px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
    th{background:#f6fbff;color:#0f172a;font-size:.95rem}
    tr:last-child td{border-bottom:none}
    .note{color:var(--muted);font-size:.92rem}
    details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:0 18px;box-shadow:var(--shadow-soft)}
    summary{cursor:pointer;list-style:none;padding:16px 0;font-weight:700}
    summary::-webkit-details-marker{display:none}
    details p{margin:0 0 16px;color:var(--muted)}
    .review{display:grid;gap:10px}
    .stars{color:#f59e0b;font-size:1rem;letter-spacing:1px}
    .quote{font-size:.98rem;color:var(--text)}
    .split{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
    .form{display:grid;gap:12px}
    .field{display:grid;gap:7px}
    label{font-weight:700;font-size:.95rem}
    input,select,textarea{width:100%;border:1px solid var(--line);background:#fff;border-radius:14px;padding:12px 14px;font:inherit;color:var(--text);outline:none;transition:.2s ease}
    input:focus,select:focus,textarea:focus{border-color:#8cc0ff;box-shadow:0 0 0 4px rgba(21,112,239,.08)}
    textarea{min-height:120px;resize:vertical}
    .footer{padding:24px 0 28px}
    .footer-inner{background:#f9fcff;border:1px solid var(--line);border-radius:24px;padding:24px;display:grid;gap:18px;box-shadow:var(--shadow-soft)}
    .footer-top{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a{padding:8px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--text)}
    .copyright{color:var(--muted);font-size:.92rem;border-top:1px solid var(--line);padding-top:14px}
    .floating{position:fixed;right:16px;bottom:16px;z-index:60;display:grid;gap:10px}
    .floating a,.floating button{width:48px;height:48px;border:none;border-radius:50%;display:grid;place-items:center;box-shadow:var(--shadow);cursor:pointer}
    .floating .kf{background:linear-gradient(135deg,var(--accent),#16a34a);color:#fff}
    .floating .top{background:#fff;color:var(--primary);border:1px solid var(--line)}
    .mobile-only{display:none}
    .scroll-reveal{opacity:0;transform:translateY(18px);transition:.6s ease}
    .scroll-reveal.show{opacity:1;transform:none}
    .rating-card{background:linear-gradient(135deg,#0f5eff,#1ea7ff);color:#fff}
    .rating-card p,.rating-card li{color:rgba(255,255,255,.9)}
    .rating-card .tag{background:rgba(255,255,255,.14);border-color:rgba(255,255,255,.16);color:#fff}
    @media (max-width: 1024px){
      .hero-grid,.split,.footer-top{grid-template-columns:1fr}
      .grid-4,.grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
      .nav-links{display:none}
      .menu-btn{display:inline-grid}
      .nav-links.open{display:flex;position:absolute;left:0;right:0;top:74px;background:rgba(245,251,255,.98);padding:16px 16px 22px;border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start}
      .nav{position:relative}
    }
    @media (max-width: 720px){
      .container{width:min(var(--max), calc(100% - 24px))}
      .hero-main,.hero-side,.card,.footer-inner{padding:18px}
      .hero-points,.grid-4,.grid-3,.grid-2{grid-template-columns:1fr}
      .hero-actions{display:grid}
      .btn{width:100%}
      h1{font-size:2rem}
      .mobile-only{display:block}
    }