.article { background: #fff; border: 1px solid #c8d8e8; border-radius: 4px; padding: 36px 40px; }

    .article p {
      font-size: 15px;
      line-height: 2.0;
      color: #333;
      margin-bottom: 24px;
    }

    .article p:last-child { margin-bottom: 0; }

    .note {
      font-size: 14px;
      color: #1a3a5c;
      font-weight: 700;
      background: #eef3f8;
      border-left: 4px solid #1a3a5c;
      padding: 10px 16px;
      margin-bottom: 24px;
    }

    .diagram {
      text-align: center;
      margin: 32px 0;
      padding: 24px;
      background: #f8fafc;
      border: 1px solid #c8d8e8;
      border-radius: 4px;
    }
    .diagram img {
      max-width: 100%;
      height: auto;
    }
    .diagram-caption {
      font-size: 13px;
      color: #1a3a5c;
      font-weight: 700;
      margin-top: 12px;
    }
    .pagetop {
      display: inline-block;
      background: #1a3a5c;
      color: #fff !important;
      text-decoration: none;
      font-size: 13px;
      font-weight: 700;
      padding: 8px 16px;
      border-radius: 3px;
      transition: background 0.2s;
    }
    .pagetop:hover { background: #0d2a4a; color: #fff !important; }

    @media (max-width: 700px) {
      .article { padding: 20px 16px; }
    }