* { margin: 0; padding: 0; box-sizing: border-box; }
  body { font-family: Arial, Helvetica, sans-serif; color: #222; background: #ffffff; line-height: 1.6; }
  .container { max-width: 900px; margin: 0 auto; padding: 20px; }
  img { max-width: 100%; display: block; }
  .hero { text-align: center; margin-bottom: 30px; }
  .hero img { width: 100%; border-radius: 8px; }
  .hero h1 { font-size: 26px; margin: 18px 0 8px; }
  .hero p { font-size: 15px; color: #555; }
  .section { margin: 36px 0; }
  .section-title { font-size: 20px; font-weight: bold; border-left: 4px solid #1e4f8a; padding-left: 12px; margin-bottom: 16px; }
  .grid-3 { display: flex; gap: 14px; flex-wrap: wrap; }
  .grid-3 .card { flex: 1 1 240px; border: 1px solid #e5e5e5; border-radius: 8px; padding: 14px; text-align: center; background: #fafbfc; }
  .card img { border-radius: 6px; margin-bottom: 10px; }
  .card h4 { font-size: 15px; margin-bottom: 6px; color: #1e4f8a; }
  .card p { font-size: 13px; color: #555; }
  .spec-table { width: 100%; border-collapse: collapse; margin-top: 10px; }
  .spec-table th, .spec-table td { border: 1px solid #e0e0e0; padding: 10px 14px; font-size: 14px; text-align: left; }
  .spec-table th { background: #1e4f8a; color: #fff; font-weight: normal; width: 30%; }
  .spec-table tr:nth-child(even) td { background: #f7f9fb; }
  .detail-row { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; margin: 16px 0; }
  .detail-row .img-box { flex: 1 1 300px; }
  .detail-row .text-box { flex: 1 1 300px; }
  .detail-row .text-box h4 { font-size: 16px; color: #1e4f8a; margin-bottom: 8px; }
  .detail-row .text-box p { font-size: 14px; color: #444; }
  .usp { background: #f0f5fa; border-radius: 8px; padding: 16px 18px; margin: 12px 0; border-left: 4px solid #1e4f8a; }
  .usp h4 { color: #1e4f8a; font-size: 15px; margin-bottom: 4px; }
  .usp p { font-size: 13px; color: #444; }
  .badge-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0; }
  .badge { background: #1e4f8a; color: #fff; border-radius: 20px; padding: 6px 16px; font-size: 13px; }
  @media (max-width: 640px) {
    .hero h1 { font-size: 20px; }
    .section-title { font-size: 17px; }
  }

details { border: 1px solid #e0e0e0; border-radius: 8px; margin-bottom: 10px; background: #fafbfc; overflow: hidden; }
  summary { cursor: pointer; padding: 14px 18px; font-size: 15px; font-weight: bold; color: #1e4f8a; list-style: none; display: flex; justify-content: space-between; align-items: center; background: #fff; }
  summary::-webkit-details-marker { display: none; }
  summary::after { content: "+"; font-size: 20px; color: #1e4f8a; transition: transform 0.2s; }
  details[open] summary::after { content: "−"; }
  details[open] summary { border-bottom: 1px solid #e5e5e5; }
  details .body { padding: 14px 18px; font-size: 14px; color: #444; }
  details .body ul { margin: 8px 0 0 18px; }
  details .body li { margin-bottom: 4px; }
  img { max-width: 100%; display: block; }
  @media (max-width: 640px) { h1 { font-size: 19px; } summary { font-size: 14px; } }