:root{
      --brand:#0b5cab;
      --brand-dark:#083d74;
      --ink:#0f172a;
      --muted:#475569;
      --line:#dbe3ef;
      --bg:#f4f8fc;
      --card:#ffffff;
      --soft:#f8fbff;
      --accent:#eaf3ff;
      --ok:#0b8a5b;
      --warn:#b45309;
      --radius:18px;
      --shadow:0 10px 28px rgba(15,23,42,.08);
      --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,#f7fbff 0%,#eef5fb 100%);
      line-height:1.78;
    }
    a{color:var(--brand);text-decoration:none}
    a:hover{text-decoration:underline}
    .wrap{max-width:var(--max);margin:0 auto;padding:28px 18px 72px}
    .hero{
      background:linear-gradient(135deg,#083d74 0%,#0b5cab 52%,#2f7fd1 100%);
      color:#fff;
      padding:34px 28px;
      border-radius:24px;
      box-shadow:var(--shadow);
    }
    .eyebrow{
      display:inline-block;
      padding:6px 12px;
      border-radius:999px;
      background:rgba(255,255,255,.14);
      border:1px solid rgba(255,255,255,.22);
      font-size:13px;
      letter-spacing:.2px;
      margin-bottom:14px;
    }
    h1,h2,h3{line-height:1.25;scroll-margin-top:92px}
    h1{margin:0 0 14px;font-size:clamp(30px,4vw,46px)}
    h2{font-size:clamp(24px,3vw,34px);margin:0 0 14px;color:var(--brand-dark)}
    h3{font-size:clamp(19px,2.2vw,24px);margin:28px 0 10px;color:var(--brand)}
    p{margin:0 0 16px}
    .hero p{max-width:980px;font-size:17px;color:#e8f2ff}
    .cta-row{
      display:flex;flex-wrap:wrap;gap:12px;margin-top:22px
    }
    .btn{
      display:inline-block;
      padding:13px 18px;
      border-radius:999px;
      font-weight:700;
      transition:.2s ease;
    }
    .btn-primary{background:#fff;color:var(--brand-dark)}
    .btn-secondary{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.35)}
    .btn:hover{text-decoration:none;transform:translateY(-1px)}
    .layout{
      display:grid;
      grid-template-columns:minmax(0,1fr) 290px;
      gap:26px;
      margin-top:26px;
      align-items:start;
    }
    .main > section{
      background:var(--card);
      border:1px solid var(--line);
      border-radius:var(--radius);
      padding:28px 24px;
      box-shadow:var(--shadow);
      margin-bottom:24px;
    }
    .toc{
      position:sticky;top:18px;
      background:var(--card);
      border:1px solid var(--line);
      border-radius:var(--radius);
      padding:20px 18px;
      box-shadow:var(--shadow);
    }
    .toc h2{font-size:18px;margin:0 0 10px;color:var(--ink)}
    .toc ol{margin:0;padding-left:20px}
    .toc li{margin:8px 0;color:var(--muted)}
    .toc li ol{margin-top:6px}
    .card-grid{
      display:grid;
      grid-template-columns:repeat(3,minmax(0,1fr));
      gap:14px;
      margin:18px 0 8px;
    }
    .mini-card{
      background:var(--soft);
      border:1px solid var(--line);
      border-radius:16px;
      padding:16px;
    }
    .mini-card h3{
      margin:0 0 8px;
      font-size:18px;
      color:var(--brand-dark);
    }
    .checklist,.faq-list,.keyword-list,.fit-list{
      padding-left:20px;
      margin:0 0 18px;
    }
    .checklist li,.faq-list li,.fit-list li{margin:8px 0}
    .note,.warning,.tip{
      border-left:4px solid var(--brand);
      background:var(--soft);
      padding:16px 18px;
      border-radius:14px;
      margin:18px 0;
    }
    .warning{border-left-color:var(--warn);background:#fff8ef}
    .tip{border-left-color:var(--ok);background:#f2fcf7}
    .two-col{
      display:grid;
      grid-template-columns:repeat(2,minmax(0,1fr));
      gap:16px;
      margin:18px 0;
    }
    .spec-table{
      width:100%;
      border-collapse:collapse;
      margin:18px 0;
      border:1px solid var(--line);
      overflow:hidden;
      border-radius:16px;
    }
    .spec-table th,.spec-table td{
      padding:13px 14px;
      border-bottom:1px solid var(--line);
      vertical-align:top;
      text-align:left;
    }
    .spec-table th{background:#eef6ff;color:var(--brand-dark);width:28%}
    figure{
      margin:22px 0;
      background:var(--soft);
      border:1px solid var(--line);
      border-radius:18px;
      padding:16px;
    }
    figure img{width:100%;height:auto;border-radius:12px;display:block;background:#fff}
    figcaption{font-size:14px;color:var(--muted);margin-top:10px}
    .related-links{
      display:grid;
      grid-template-columns:repeat(2,minmax(0,1fr));
      gap:12px;
      margin-top:16px;
    }
    .related-links a{
      display:block;
      padding:14px 15px;
      background:var(--soft);
      border:1px solid var(--line);
      border-radius:14px;
      font-weight:700;
    }
    .faq-item{
      border:1px solid var(--line);
      border-radius:16px;
      padding:16px 18px;
      background:#fff;
      margin:12px 0;
    }
    .faq-item h3{margin:0 0 8px;font-size:18px;color:var(--brand-dark)}
    .cta-box{
      background:linear-gradient(135deg,#eaf3ff 0%,#f7fbff 100%);
      border:1px solid #cfe0f5;
      border-radius:20px;
      padding:24px;
    }
    .footer-note{
      font-size:13px;
      color:var(--muted);
      margin-top:20px;
    }
    @media (max-width:980px){
      .layout{grid-template-columns:1fr}
      .toc{position:relative;top:auto}
      .card-grid,.two-col,.related-links{grid-template-columns:1fr}
    }