:root {
      --ink: #06131f;
      --paper: #ffffff;
      --line: #dbe3ea;
      --muted: #4b5563;
      --signal: #0b63ce;
      --font-sans: HelveticaNeue, "Helvetica Neue", Helvetica, Arial,
        "游ゴシック体", YuGothic, "游ゴシック Medium", "Yu Gothic Medium",
        "游ゴシック", "Yu Gothic", "ヒラギノ角ゴ ProN W3", "Hiragino Kaku Gothic ProN",
        "ヒラギノ角ゴ Pro W3", "Hiragino Kaku Gothic Pro", "MS ゴシック", "MS Gothic",
        sans-serif;
      --font-mono: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
      font-family: var(--font-sans);
      color: var(--ink);
      background: var(--paper);
    }

    * { box-sizing: border-box; }

    body {
      margin: 0;
      font-size: 16px;
      line-height: 1.8;
      font-feature-settings: "palt";
      -webkit-font-smoothing: antialiased;
      word-wrap: break-word;
      background: #f8f7f2;
    }

    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; height: auto; }

    .site-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      min-height: 62px;
      padding: 14px clamp(20px, 4vw, 58px) 10px;
      background: #f8f7f2;
      box-shadow: inset 0 -1px 0 rgba(6, 19, 31, 0.08);
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      flex: 0 0 auto;
    }

    .brand-lockup {
      display: block;
      width: 168px;
      height: auto;
      object-fit: contain;
    }

    @media (max-width: 620px) {
      .brand-lockup { width: 152px; }
    }

    .back-link {
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 780;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .back-link:hover,
    .back-link:focus-visible {
      color: var(--signal);
      outline: none;
    }

    main {
      max-width: 760px;
      margin: 0 auto;
      padding: clamp(40px, 7vw, 88px) clamp(20px, 4vw, 40px) clamp(60px, 9vw, 120px);
    }

    .breadcrumb {
      margin-bottom: 18px;
      color: var(--muted);
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 780;
      letter-spacing: 0.06em;
    }

    .breadcrumb a {
      text-decoration: underline;
      text-underline-offset: 3px;
    }

    .breadcrumb a:hover,
    .breadcrumb a:focus-visible {
      color: var(--signal);
      outline: none;
    }

    .section-label {
      color: var(--signal);
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 780;
      letter-spacing: 0.1em;
      text-transform: uppercase;
    }

    h1 {
      margin: 14px 0 10px;
      font-size: clamp(26px, 3.6vw, 36px);
      font-weight: 820;
      line-height: 1.35;
      letter-spacing: 0.02em;
    }

    .page-meta {
      margin: 0 0 28px;
      color: var(--muted);
      font-family: var(--font-mono);
      font-size: 12px;
      letter-spacing: 0.04em;
    }

    .ai-summary {
      margin: 0 0 28px;
      padding: 18px 22px;
      border: 1px solid var(--ink);
      background: var(--paper);
    }

    .ai-summary b {
      display: block;
      margin-bottom: 8px;
      color: var(--signal);
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 780;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .ai-summary ul {
      margin: 0 0 8px;
      padding-left: 1.4em;
    }

    .ai-summary li { margin-bottom: 4px; }

    .ai-summary small {
      display: block;
      color: var(--muted);
      font-size: 12px;
      line-height: 1.6;
    }

    .article-thumb {
      margin: 0 0 28px;
      overflow: hidden;
      border: 1px solid rgba(6, 19, 31, 0.18);
      background: rgba(6, 19, 31, 0.05);
    }

    .article-thumb img {
      width: 100%;
      aspect-ratio: 16 / 9;
      object-fit: cover;
    }

    section {
      margin-bottom: 34px;
      padding-top: 22px;
      border-top: 1px solid var(--ink);
    }

    h2 {
      margin: 0 0 12px;
      font-size: 19px;
      font-weight: 820;
      letter-spacing: 0.02em;
    }

    p, ul { margin: 0 0 12px; color: var(--ink); }
    ul { padding-left: 1.4em; }
    li { margin-bottom: 4px; }

    main a {
      color: var(--ink);
      text-decoration: underline;
      text-underline-offset: 3px;
    }

    main a:hover,
    main a:focus-visible {
      color: var(--signal);
      outline: none;
    }

    .read-original {
      margin: 0 0 34px;
    }

    .read-original a {
      display: inline-block;
      padding: 12px 22px;
      border: 1px solid var(--ink);
      background: var(--paper);
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 780;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      text-decoration: none;
    }

    .read-original a:hover,
    .read-original a:focus-visible {
      color: var(--signal);
      border-color: var(--signal);
      outline: none;
    }

    .site-footer {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 10px 16px;
      padding: 18px clamp(20px, 4vw, 58px);
      background: linear-gradient(180deg, #eef2f5 0%, #f8f7f2 62%);
      box-shadow: inset 0 1px 0 rgba(6, 19, 31, 0.08);
      color: var(--muted);
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 850;
      letter-spacing: 0.04em;
      text-transform: uppercase;
    }

    .site-footer a:hover,
    .site-footer a:focus-visible {
      color: var(--signal);
      outline: none;
    }

    .toc {
      margin: 0 0 28px;
      padding: 18px 22px;
      border: 1px solid var(--line);
      background: var(--paper);
    }

    .toc b {
      display: block;
      margin-bottom: 8px;
      color: var(--signal);
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 780;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .toc ol {
      margin: 0;
      padding-left: 1.4em;
    }

    .toc li { margin-bottom: 4px; }

    .toc a {
      text-decoration: underline;
      text-underline-offset: 3px;
    }

    .toc a:hover,
    .toc a:focus-visible {
      color: var(--signal);
      outline: none;
    }

    .reprint-note {
      color: var(--muted);
      font-size: 13px;
    }

    .article-body h2 { scroll-margin-top: 24px; }
    .article-body h3 {
      margin: 22px 0 10px;
      font-size: 16.5px;
      font-weight: 820;
    }

    .article-body figure {
      margin: 0 0 16px;
      overflow: hidden;
      border: 1px solid rgba(6, 19, 31, 0.12);
      background: rgba(6, 19, 31, 0.03);
    }

    .article-body figure img { width: 100%; }

    .article-body blockquote {
      margin: 0 0 16px;
      padding: 10px 18px;
      border-left: 3px solid var(--line);
      color: var(--muted);
    }

    .article-body hr {
      margin: 28px 0;
      border: none;
      border-top: 1px solid var(--line);
    }

    .article-cta {
      margin: 34px 0 0;
      padding: 24px clamp(18px, 4vw, 30px);
      border: 1px solid var(--line);
      background: linear-gradient(180deg, rgba(11, 99, 206, 0.045), rgba(11, 99, 206, 0.015));
    }

    .article-cta h2 {
      margin: 0 0 8px;
      font-size: 17px;
      font-weight: 860;
      letter-spacing: 0.01em;
    }

    .article-cta p {
      margin: 0 0 16px;
      color: var(--muted);
      font-size: 14.5px;
      line-height: 1.75;
    }

    .article-cta-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .article-cta-button {
      display: inline-flex;
      align-items: center;
      padding: 10px 18px;
      border: 1px solid var(--line);
      background: var(--paper);
      font-size: 13.5px;
      font-weight: 760;
      letter-spacing: 0.01em;
      transition: border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
    }

    .article-cta-button:hover {
      border-color: var(--signal);
      color: var(--signal);
      transform: translateY(-1px);
    }

    .article-cta-button.primary {
      border-color: var(--signal);
      background: var(--signal);
      color: #fff;
    }

    .article-cta-button.primary:hover {
      color: #fff;
      filter: brightness(1.08);
    }

    @media (max-width: 420px) {
      .article-cta-actions { flex-direction: column; align-items: stretch; }
      .article-cta-button { justify-content: center; }
    }
    .article-video-player {
      width: 100%;
      aspect-ratio: 16 / 9;
      min-height: 202px;
      overflow: hidden;
      border: 1px solid rgba(6, 19, 31, 0.18);
      background: #000;
    }

    .article-video-player iframe {
      display: block;
      width: 100%;
      height: 100%;
      border: 0;
    }

    .article-video-link {
      margin-top: 10px;
      font-size: 13px;
    }

    .article-body pre {
      margin: 0 0 16px;
      padding: 14px 16px;
      overflow-x: auto;
      border: 1px solid var(--line);
      background: #f1f4f7;
      font-family: var(--font-mono);
      font-size: 13px;
      line-height: 1.65;
      white-space: pre;
    }

    .article-body code { font-family: inherit; }