:root{
      --bg:#f6f8fc;
      --card:#ffffff;
      --ink:#162033;
      --muted:#5f6b82;
      --line:#dfe6f2;
      --brand:#2563eb;
      --brand2:#7c3aed;
      --accent:#ff8a3d;
      --shadow:0 18px 50px rgba(35,58,100,.10);
      --radius:22px;
      --container:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;background:linear-gradient(180deg,#eef4ff 0%,#f8fbff 28%,#f6f8fc 100%);color:var(--ink);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}
    header{position:sticky;top:0;z-index:50;background:rgba(246,248,252,.86);backdrop-filter:blur(14px);border-bottom:1px solid rgba(223,230,242,.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 img{width:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;padding:5px;box-shadow:0 8px 20px rgba(37,99,235,.12)}
    .brand strong{display:block;font-size:18px}
    .brand span{display:block;font-size:12px;color:var(--muted)}
    .nav-links{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:flex-end}
    .nav-links a{font-size:14px;color:#334155;padding:8px 10px;border-radius:999px;transition:.2s}
    .nav-links a:hover{background:#e8efff;color:#123}
    .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;cursor:pointer;transition:.22s;white-space:nowrap}
    .btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 12px 28px rgba(37,99,235,.25)}
    .btn-secondary{background:#fff;color:#24324d;border-color:var(--line)}
    .btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
    .menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    main{overflow:hidden}
    section{padding:70px 0}
    .hero{padding:42px 0 34px;position:relative}
    .hero-wrap{display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:stretch}
    .hero-copy{background:linear-gradient(135deg,rgba(37,99,235,.08),rgba(124,58,237,.08));border:1px solid rgba(37,99,235,.10);border-radius:28px;padding:34px;box-shadow:var(--shadow);position:relative;overflow:hidden}
    .hero-copy:before,.hero-copy:after{content:"";position:absolute;border-radius:50%;background:radial-gradient(circle,rgba(255,138,61,.25),rgba(255,138,61,0) 70%)}
    .hero-copy:before{width:220px;height:220px;right:-70px;top:-70px}
    .hero-copy:after{width:180px;height:180px;left:-50px;bottom:-80px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border-radius:999px;background:#fff;border:1px solid rgba(37,99,235,.12);font-size:13px;color:#355}
    h1{margin:16px 0 14px;font-size:clamp(30px,5vw,54px);line-height:1.08;letter-spacing:-.02em}
    .hero p{margin:0;color:var(--muted);font-size:16px;max-width:62ch}
    .hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .hero-points{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:24px}
    .mini{background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px}
    .mini b{display:block;font-size:18px}
    .mini span{font-size:13px;color:var(--muted)}
    .hero-side{display:grid;gap:14px}
    .side-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:20px;box-shadow:var(--shadow)}
    .side-card h3{margin:0 0 10px;font-size:18px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag-cloud span{padding:8px 12px;border-radius:999px;background:#f2f6ff;color:#274;color:#31415f;border:1px solid #d9e4ff;font-size:13px}
    .metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .metric{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:var(--shadow)}
    .metric b{display:block;font-size:28px;margin-bottom:4px}
    .metric span{color:var(--muted);font-size:14px}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:22px}
    .section-head h2{margin:0;font-size:30px}
    .section-head p{margin:0;color:var(--muted);max-width:68ch}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
    .card{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:22px;box-shadow:var(--shadow);transition:.22s}
    .card:hover{transform:translateY(-4px)}
    .card h3{margin:0 0 10px;font-size:20px}
    .card p,.card li{color:var(--muted)}
    .steps{counter-reset:step}
    .step{position:relative;padding-left:18px}
    .step:before{counter-increment:step;content:counter(step);position:absolute;left:0;top:2px;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:700;font-size:13px}
    .compare{overflow:auto;border:1px solid var(--line);border-radius:24px;background:#fff;box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:16px 14px;border-bottom:1px solid #edf2f8;text-align:left;vertical-align:top}
    th{background:#f6f9ff;color:#24324d}
    .score{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:#eef6ff;color:#1747a6;font-weight:700}
    .note{font-size:13px;color:var(--muted)}
    .accordion{display:grid;gap:12px}
    .qa{background:#fff;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}
    .qa button{width:100%;text-align:left;border:0;background:transparent;padding:18px 18px;font-size:16px;font-weight:700;color:var(--ink);cursor:pointer;display:flex;justify-content:space-between;gap:16px}
    .qa .ans{max-height:0;overflow:hidden;transition:max-height .28s ease;padding:0 18px;color:var(--muted)}
    .qa.open .ans{max-height:180px;padding-bottom:18px}
    .reviews .card{height:100%}
    .review-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}
    .avatar{width:44px;height:44px;border-radius:14px;background:linear-gradient(135deg,#dbe8ff,#f3e6ff)}
    .timeline{display:grid;gap:14px}
    .timeline .item{display:grid;grid-template-columns:110px 1fr;gap:16px;align-items:start;padding:16px 0;border-bottom:1px dashed #dfe6f2}
    .timeline .item:last-child{border-bottom:0;padding-bottom:0}
    .articles{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
    .article{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px}
    .article a{color:var(--brand);font-weight:700}
    .form-wrap{display:grid;grid-template-columns:1fr .85fr;gap:18px;align-items:start}
    form{display:grid;gap:14px}
    .field{display:grid;gap:8px}
    label{font-size:14px;font-weight:700;color:#25324a}
    input,select,textarea{width:100%;border:1px solid var(--line);border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--ink)}
    textarea{min-height:132px;resize:vertical}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a{padding:8px 12px;border-radius:999px;background:#eef4ff;color:#234;border:1px solid #d9e4ff}
    footer{padding:28px 0 36px;border-top:1px solid var(--line);background:#f8fbff;color:#24324d}
    .footer-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:18px}
    .contact-box{display:grid;grid-template-columns:120px 1fr;gap:16px;align-items:center}
    .contact-box img{border-radius:18px;border:1px solid var(--line);background:#fff;padding:6px}
    .float-bar{position:fixed;right:18px;bottom:18px;z-index:60;display:grid;gap:10px}
    .float-bar a,.float-bar button{border:0;border-radius:16px;padding:12px 14px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:var(--shadow);cursor:pointer}
    .backtop{display:none}
    .fade{opacity:0;transform:translateY(18px);transition:.55s ease}
    .fade.in{opacity:1;transform:none}
    .mobile-panel{display:none}
    @media (max-width: 980px){
      .hero-wrap,.grid-3,.grid-2,.metrics,.form-wrap,.footer-grid,.articles{grid-template-columns:1fr}
      .hero-points{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:start}
      .nav-links,.nav-actions{display:none}
      .menu-btn{display:inline-flex}
      .mobile-panel{display:none;padding:0 0 16px}
      .mobile-panel.open{display:block}
      .mobile-panel a{display:block;padding:10px 0;border-top:1px solid #edf2f8;color:#24324d}
      .timeline .item{grid-template-columns:1fr;gap:6px}
      .contact-box{grid-template-columns:1fr}
    }