:root{
      --bg:#f5f9ff;
      --card:#ffffff;
      --ink:#12253f;
      --muted:#5b6b80;
      --line:#dbe7f5;
      --brand:#2d7ff9;
      --brand-dark:#1959b8;
      --soft:#eaf3ff;
      --accent:#6bb6ff;
      --shadow:0 16px 40px rgba(18,37,63,.08);
      --radius-xl:24px;
      --radius-lg:18px;
      --radius-md:12px;
      --max:1120px;
    }

    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{
      margin:0;
      font-family:Arial, Helvetica, sans-serif;
      color:var(--ink);
      background:linear-gradient(180deg,#f8fbff 0%,#eef5ff 100%);
      line-height:1.7;
    }

    img{max-width:100%;display:block}
    a{color:var(--brand-dark);text-decoration:none}
    a:hover{text-decoration:underline}

    .container{
      width:min(var(--max), calc(100% - 32px));
      margin:0 auto;
    }

    .topbar{
      background:#0f2038;
      color:#dce8f9;
      font-size:14px;
    }
    .topbar .container{
      display:flex;
      justify-content:space-between;
      gap:16px;
      padding:10px 0;
      flex-wrap:wrap;
    }

    .hero{
      padding:44px 0 28px;
    }

    .hero-grid{
      display:grid;
      grid-template-columns:1.1fr .9fr;
      gap:28px;
      align-items:center;
    }

    .eyebrow{
      display:inline-block;
      padding:8px 14px;
      border-radius:999px;
      background:var(--soft);
      color:var(--brand-dark);
      font-size:13px;
      font-weight:700;
      letter-spacing:.3px;
      margin-bottom:16px;
    }

    h1{
      font-size:clamp(32px,4vw,50px);
      line-height:1.12;
      margin:0 0 16px;
      letter-spacing:-.02em;
    }

    .lead{
      font-size:18px;
      color:var(--muted);
      margin:0 0 24px;
      max-width:760px;
    }

    .hero-actions{
      display:flex;
      flex-wrap:wrap;
      gap:12px;
      margin-top:22px;
    }

    .btn{
      display:inline-flex;
      align-items:center;
      justify-content:center;
      padding:13px 18px;
      border-radius:999px;
      font-weight:700;
      border:1px solid transparent;
      transition:.2s ease;
    }

    .btn-primary{
      background:var(--brand);
      color:#fff;
      box-shadow:var(--shadow);
    }

    .btn-primary:hover{
      background:var(--brand-dark);
      text-decoration:none;
    }

    .btn-secondary{
      background:#fff;
      color:var(--brand-dark);
      border-color:var(--line);
    }

    .hero-card{
      background:var(--card);
      border:1px solid var(--line);
      border-radius:var(--radius-xl);
      box-shadow:var(--shadow);
      overflow:hidden;
    }

    .hero-media{
      aspect-ratio: 4 / 3;
      background:
        linear-gradient(135deg, rgba(45,127,249,.13), rgba(107,182,255,.08)),
        #eef5ff;
      display:flex;
      align-items:center;
      justify-content:center;
      padding:18px;
    }

    .image-placeholder{
      width:100%;
      height:100%;
      border:2px dashed #bcd0ea;
      border-radius:18px;
      display:flex;
      align-items:center;
      justify-content:center;
      text-align:center;
      color:#5c78a0;
      background:rgba(255,255,255,.65);
      padding:20px;
      font-weight:700;
    }

    .hero-caption{
      padding:14px 18px 18px;
      color:var(--muted);
      font-size:14px;
    }

    .content-wrap{
      display:grid;
      grid-template-columns:280px minmax(0,1fr);
      gap:28px;
      padding:22px 0 56px;
    }

    .toc{
      position:sticky;
      top:18px;
      align-self:start;
      background:var(--card);
      border:1px solid var(--line);
      border-radius:var(--radius-lg);
      box-shadow:var(--shadow);
      padding:20px;
    }

    .toc h3{
      margin:0 0 12px;
      font-size:18px;
    }

    .toc ul{
      list-style:none;
      padding:0;
      margin:0;
    }

    .toc li+li{margin-top:10px}
    .toc a{
      color:var(--ink);
      font-size:15px;
    }

    .article{
      min-width:0;
    }

    .section{
      background:var(--card);
      border:1px solid var(--line);
      border-radius:var(--radius-xl);
      box-shadow:var(--shadow);
      padding:30px;
      margin-bottom:22px;
    }

    h2{
      font-size:30px;
      line-height:1.2;
      margin:0 0 16px;
      letter-spacing:-.02em;
    }

    h3{
      font-size:22px;
      line-height:1.3;
      margin:24px 0 12px;
    }

    p{
      margin:0 0 14px;
      color:#24374e;
    }

    .summary-box{
      background:linear-gradient(180deg,#f7fbff 0%,#edf5ff 100%);
      border:1px solid #cfe0f6;
      border-radius:18px;
      padding:20px;
    }

    .checklist,
    .compare-list{
      margin:14px 0 0;
      padding-left:20px;
    }

    .checklist li,
    .compare-list li{
      margin-bottom:10px;
    }

    .table-wrap{
      overflow-x:auto;
      margin-top:16px;
      border:1px solid var(--line);
      border-radius:16px;
    }

    table{
      width:100%;
      border-collapse:collapse;
      background:#fff;
    }

    th, td{
      padding:16px;
      border-bottom:1px solid var(--line);
      text-align:left;
      vertical-align:top;
    }

    th{
      background:#f3f8ff;
      font-size:15px;
    }

    tr:last-child td{border-bottom:none}

    .cta{
      background:linear-gradient(135deg,#1f6feb 0%,#5ea9ff 100%);
      color:#fff;
      border:none;
    }

    .cta p, .cta h2{color:#fff}
    .cta .btn-secondary{
      border-color:rgba(255,255,255,.35);
      background:rgba(255,255,255,.1);
      color:#fff;
    }

    .faq-item{
      border-top:1px solid var(--line);
      padding:18px 0;
    }

    .faq-item:first-child{
      border-top:none;
      padding-top:0;
    }

    .muted{
      color:var(--muted);
    }

    .note{
      font-size:14px;
      color:var(--muted);
      margin-top:14px;
    }

    footer{
      padding:20px 0 46px;
      color:var(--muted);
      font-size:14px;
    }

    @media (max-width: 940px){
      .hero-grid,
      .content-wrap{
        grid-template-columns:1fr;
      }
      .toc{
        position:static;
      }
      .section{
        padding:24px;
      }
    }

    @media (max-width: 640px){
      .container{
        width:min(var(--max), calc(100% - 20px));
      }
      .hero{
        padding-top:28px;
      }
      .section{
        padding:20px;
        border-radius:18px;
      }
      h2{font-size:26px}
      h3{font-size:20px}
    }