*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: 'Segoe UI', system-ui, sans-serif;
      background: #ffffff;
      color: #111111;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }
    .page-header {
      background: #f9fafb;
      border-bottom: 1px solid #e5e7eb;
      padding: 1.25rem 2rem;
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .page-header a {
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }
    .page-header img { height: 32px; width: auto; }
    .page-header span {
      font-size: 0.85rem;
      color: #6b7280;
    }
    main {
      flex: 1;
      max-width: 780px;
      margin: 0 auto;
      padding: 3rem 2rem 4rem;
      width: 100%;
    }
    h1 {
      font-size: clamp(1.8rem, 4vw, 2.4rem);
      font-weight: 800;
      margin-bottom: 0.5rem;
    }
    .updated {
      font-size: 0.85rem;
      color: #9ca3af;
      margin-bottom: 2.5rem;
    }
    h2 {
      font-size: 1.2rem;
      font-weight: 700;
      margin: 2rem 0 0.75rem;
      color: #111;
    }
    h3 {
      font-size: 1rem;
      font-weight: 600;
      margin: 1.25rem 0 0.5rem;
      color: #374151;
    }
    p, li {
      font-size: 0.975rem;
      line-height: 1.75;
      color: #374151;
    }
    ul {
      padding-left: 1.5rem;
      margin: 0.5rem 0;
    }
    li { margin-bottom: 0.4rem; }
    a { color: #2dd4c4; }
    table {
      width: 100%;
      border-collapse: collapse;
      margin: 0.75rem 0;
      font-size: 0.9rem;
    }
    th, td {
      text-align: left;
      padding: 0.5rem 0.75rem;
      border: 1px solid #e5e7eb;
      color: #374151;
    }
    th { background: #f9fafb; font-weight: 600; }
    .toc {
      background: #f9fafb;
      border: 1px solid #e5e7eb;
      border-radius: 0.75rem;
      padding: 1.25rem 1.5rem;
      margin-bottom: 2rem;
    }
    .toc p { font-weight: 700; margin-bottom: 0.5rem; color: #111; }
    .toc ol { padding-left: 1.25rem; }
    .toc li { margin-bottom: 0.2rem; }
    .toc a { color: #374151; text-decoration: underline; }
    footer {
      text-align: center;
      padding: 1.5rem;
      font-size: 0.8rem;
      color: #9ca3af;
      border-top: 1px solid #e5e7eb;
    }
    footer a { color: #9ca3af; text-decoration: underline; }