:root{
      --primary:#075985;
      --primary-dark:#073b55;
      --secondary:#0891b2;
      --soft:#eef9fc;
      --soft2:#f7fcfe;
      --border:#cfe8ef;
      --text:#18313d;
      --muted:#5d7480;
      --white:#fff;
      --success:#087f5b;
      --shadow:0 16px 42px rgba(7,89,133,.10);
    }
    *{box-sizing:border-box}
    body{
      margin:0;
      background:#f6fafc;
      color:var(--text);
      font-family:Arial,Helvetica,sans-serif;
      line-height:1.75;
    }
    a{color:var(--primary);text-underline-offset:3px}
    img{max-width:100%;display:block}
    .page{max-width:1180px;margin:auto;padding:24px 16px 70px}
    .hero{
      display:grid;
      grid-template-columns:1.35fr .65fr;
      gap:42px;
      align-items:center;
      padding:54px;
      border:1px solid var(--border);
      border-radius:28px;
      background:
        radial-gradient(circle at 92% 8%,rgba(8,145,178,.18),transparent 30%),
        linear-gradient(135deg,#fbfeff,#eaf8fc);
      box-shadow:var(--shadow);
      overflow:hidden;
    }
    .eyebrow{
      display:inline-flex;
      align-items:center;
      gap:9px;
      padding:8px 13px;
      border:1px solid #b7dfe9;
      border-radius:999px;
      background:rgba(255,255,255,.85);
      color:var(--primary);
      font-size:13px;
      font-weight:700;
      letter-spacing:.07em;
      text-transform:uppercase;
    }
    .eyebrow:before{
      content:"";
      width:9px;height:9px;border-radius:50%;
      background:var(--secondary);
      box-shadow:0 0 0 5px rgba(8,145,178,.12);
    }
    h1,h2,h3{color:var(--primary-dark);line-height:1.24}
    h1{font-size:clamp(34px,5vw,58px);margin:18px 0 18px}
    h2{font-size:clamp(27px,3.5vw,38px);margin:0 0 18px}
    h3{font-size:21px;margin:0 0 10px}
    .lead{font-size:20px;color:#365564;margin:0}
    .meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:25px}
    .meta span{padding:7px 11px;border:1px solid #c7e4eb;border-radius:8px;background:#fff;color:var(--muted);font-size:13px;font-weight:600}
    .product-img{
      min-height:400px;
      display:flex;
      align-items:center;
      justify-content:center;
      padding:24px;
      border-radius:24px;
      background:rgba(255,255,255,.82);
      box-shadow:0 18px 40px rgba(8,59,85,.10)
    }
    .product-img img{max-height:410px;object-fit:contain}
    .quick,.toc,.question,.checklist,.faq,.references,.author{
      margin-top:36px;
      border:1px solid var(--border);
      border-radius:18px;
      background:var(--white);
      box-shadow:0 10px 30px rgba(7,89,133,.06)
    }
    .quick{padding:30px;border-left:5px solid var(--secondary);background:var(--soft)}
    .quick h2{font-size:27px}
    .summary-grid{
      display:grid;
      grid-template-columns:repeat(5,1fr);
      gap:12px;
      margin-top:22px
    }
    .summary-item{padding:18px 14px;border:1px solid var(--border);border-radius:13px;background:#fff;text-align:center}
    .summary-number{display:block;color:var(--secondary);font-size:26px;font-weight:800}
    .summary-label{font-size:13px;color:var(--muted);line-height:1.4}
    .toc{padding:32px}
    .toc ol{columns:2;column-gap:44px;margin:0;padding-left:24px}
    .toc li{margin:8px 0;break-inside:avoid}
    .intro{margin:48px 0 10px}
    .intro p:first-of-type{font-size:19px}
    .question{padding:36px;scroll-margin-top:20px}
    .question-head{display:grid;grid-template-columns:58px 1fr;gap:18px;align-items:start;margin-bottom:18px}
    .qnum{
      width:58px;height:58px;
      display:flex;align-items:center;justify-content:center;
      border-radius:16px;
      background:linear-gradient(135deg,var(--primary),var(--secondary));
      color:#fff;font-size:23px;font-weight:800;
      box-shadow:0 10px 20px rgba(7,89,133,.20)
    }
    .question h2{font-size:clamp(24px,3vw,33px);margin:4px 0 0}
    .ask,.good,.warn{
      margin-top:20px;
      padding:22px;
      border-radius:14px
    }
    .ask{border:1px solid #bfe3eb;background:var(--soft2)}
    .good{border:1px solid #bfe5d7;background:#f1fbf7}
    .warn{border:1px solid #efd28b;background:#fff8e8}
    .ask strong,.good strong,.warn strong{display:block;margin-bottom:8px}
    .good strong{color:var(--success)}
    .warn strong{color:#775213}
    .table-wrap{overflow:auto;margin-top:22px;border:1px solid var(--border);border-radius:14px}
    table{width:100%;min-width:720px;border-collapse:collapse;background:#fff}
    th,td{padding:16px;border-bottom:1px solid #e4f0f3;text-align:left;vertical-align:top}
    th{background:var(--primary-dark);color:#fff;font-size:14px}
    tr:last-child td{border-bottom:none}
    .feature{
      display:grid;
      grid-template-columns:.72fr 1.28fr;
      gap:34px;
      align-items:center;
      margin-top:46px;
      padding:38px;
      border-radius:22px;
      background:linear-gradient(135deg,#073c57,#075985 55%,#087e9a);
      color:#fff;
      box-shadow:var(--shadow)
    }
    .feature h2{color:#fff}
    .feature p{color:#e6f6fa}
    .feature-image{
      min-height:300px;display:flex;align-items:center;justify-content:center;
      padding:18px;border-radius:18px;background:#fff
    }
    .feature-image img{max-height:350px;object-fit:contain}
    .buttons{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
    .btn{
      display:inline-flex;align-items:center;justify-content:center;
      min-height:48px;padding:13px 20px;border-radius:10px;
      background:#fff;color:var(--primary-dark)!important;
      text-decoration:none;font-weight:700
    }
    .btn-outline{background:transparent;color:#fff!important;border:1px solid rgba(255,255,255,.55)}
    .checklist{padding:38px;background:linear-gradient(180deg,#fff,#f3fbfd)}
    .check-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px 30px}
    .check{position:relative;padding-left:32px}
    .check:before{
      content:"✓";position:absolute;left:0;top:1px;
      width:23px;height:23px;display:flex;align-items:center;justify-content:center;
      border-radius:50%;background:#d9f4eb;color:var(--success);font-weight:900
    }
    .conclusion{
      margin-top:48px;padding:42px;border-radius:22px;
      background:var(--primary-dark);color:#e0f0f5
    }
    .conclusion h2{color:#fff}
    .faq{padding:34px}
    details{margin-bottom:12px;border:1px solid var(--border);border-radius:13px;background:#fff}
    summary{cursor:pointer;padding:20px;color:var(--primary-dark);font-weight:700}
    details p{padding:0 20px 20px;color:var(--muted)}
    .references{padding:30px;color:var(--muted);font-size:14px}
    .author{display:grid;grid-template-columns:72px 1fr;gap:18px;align-items:center;padding:24px;background:var(--soft2)}
    .author img{width:72px;height:72px;object-fit:contain;border-radius:14px;background:#fff;border:1px solid var(--border)}
    footer{margin-top:28px;text-align:center;color:var(--muted);font-size:13px}
    @media(max-width:900px){
      .hero,.feature{grid-template-columns:1fr}
      .summary-grid{grid-template-columns:repeat(2,1fr)}
      .toc ol{columns:1}
      .check-grid{grid-template-columns:1fr}
    }
    @media(max-width:600px){
      .page{padding:10px 10px 50px}
      .hero,.question,.feature,.checklist,.conclusion,.faq{padding:24px 20px}
      .question-head{grid-template-columns:46px 1fr;gap:13px}
      .qnum{width:46px;height:46px;font-size:19px;border-radius:13px}
      .summary-grid{grid-template-columns:1fr}
      .buttons{flex-direction:column}
      .btn{width:100%}
    }