:root { color-scheme: light; font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif; color: #172033; background: #f8fafc; }
    body { margin: 0; }
    a { color: #0f5f9e; text-decoration: none; }
    a:hover { text-decoration: underline; }
    .header { background: #ffffff; border-bottom: 1px solid #e2e8f0; }
    .header-inner { max-width: 1180px; margin: 0 auto; padding: 16px 20px; display: flex; gap: 16px; align-items: center; justify-content: space-between; }
    .brand { color: #0f172a; font-weight: 800; letter-spacing: 0; }
    .header nav { display: flex; gap: 14px; flex-wrap: wrap; font-size: 14px; }
    .layout { max-width: 1180px; margin: 0 auto; padding: 28px 20px 56px; display: grid; grid-template-columns: minmax(210px, 280px) minmax(0, 1fr); gap: 28px; }
    .toc { align-self: start; position: sticky; top: 16px; max-height: calc(100vh - 32px); overflow: auto; border-right: 1px solid #e2e8f0; padding-right: 18px; font-size: 14px; }
    .toc p { margin: 0 0 12px; font-weight: 700; color: #334155; }
    .toc ul { margin: 0; padding: 0; list-style: none; }
    .toc li { margin: 0 0 8px; }
    .toc li.topic { padding-left: 14px; font-size: 13px; }
    .toc a { color: #475569; }
    .toc a.current { color: #0f172a; font-weight: 700; }
    article { background: #ffffff; border: 1px solid #e2e8f0; border-radius: 8px; padding: 28px; line-height: 1.9; box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04); }
    article h1 { margin: 0 0 24px; font-size: 32px; line-height: 1.35; letter-spacing: 0; }
    article h2 { margin: 40px 0 14px; padding-top: 12px; border-top: 1px solid #e2e8f0; font-size: 24px; letter-spacing: 0; }
    article h3 { margin: 28px 0 10px; font-size: 20px; letter-spacing: 0; }
    article p, article ul, article blockquote { margin: 0 0 18px; }
    article ul { padding-left: 1.4em; }
    article code { border-radius: 4px; background: #f1f5f9; padding: 0.1em 0.32em; font-size: 0.94em; }
    article strong { color: #0f172a; }
    article picture, article img { max-width: 100%; height: auto; }
    article picture { display: block; margin: 22px 0; }
    blockquote { border-left: 4px solid #cbd5e1; padding: 8px 0 8px 16px; color: #475569; background: #f8fafc; }
    @media (max-width: 860px) {
      .layout { display: block; padding: 18px 14px 40px; }
      .toc { position: static; max-height: none; border-right: 0; border-bottom: 1px solid #e2e8f0; padding: 0 0 18px; margin-bottom: 18px; }
      article { padding: 20px; }
      article h1 { font-size: 26px; }
    }