: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; }

    html { scroll-behavior: smooth; }

    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;
    }

    .brand-symbol { width: 40px; }
    .brand-wordmark { width: 96px; }

    .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);
    }

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

    .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;
    }

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

    h1 {
      margin: 14px 0 10px;
      font-size: clamp(28px, 4vw, 40px);
      font-weight: 820;
      line-height: 1.2;
      letter-spacing: 0.02em;
    }

    .glossary-lead {
      margin: 0 0 36px;
      color: var(--ink);
    }

    .toc {
      margin: 0 0 44px;
      padding: 20px 24px;
      border: 1px solid var(--ink);
      background: var(--paper);
    }

    .toc b {
      display: block;
      margin-bottom: 10px;
      color: var(--signal);
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 780;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

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

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

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

    h2 {
      margin: 0 0 12px;
      font-size: clamp(20px, 2.4vw, 24px);
      font-weight: 820;
      letter-spacing: 0.02em;
      line-height: 1.4;
    }

    h3 {
      margin: 24px 0 8px;
      font-size: 17px;
      font-weight: 820;
      letter-spacing: 0.02em;
      line-height: 1.5;
    }

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

    .explosion-figure {
      margin: 20px 0 18px;
      padding: 22px;
      border: 1px solid var(--ink);
      background: var(--paper);
    }

    .explosion-figure figcaption {
      margin-bottom: 16px;
      color: var(--signal);
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 780;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .explosion-flow {
      display: flex;
      flex-direction: column;
    }

    .explosion-duo {
      display: grid;
      grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1fr);
      align-items: stretch;
      gap: 10px;
    }

    .explosion-duo .explosion-step {
      grid-template-columns: 34px minmax(0, 1fr);
      gap: 10px;
      padding: 13px;
    }

    .explosion-duo .explosion-number {
      width: 34px;
      height: 34px;
    }

    .explosion-duo-link {
      display: grid;
      place-items: center;
      color: var(--signal);
      font-size: 18px;
      font-weight: 820;
    }

    .explosion-step {
      display: grid;
      grid-template-columns: 38px minmax(0, 1fr);
      align-items: start;
      gap: 14px;
      padding: 14px 16px;
      border: 1px solid var(--ink);
      background: var(--paper);
    }

    .explosion-step.is-origin {
      color: var(--paper);
      background: var(--ink);
    }

    .explosion-number {
      display: grid;
      width: 38px;
      height: 38px;
      place-items: center;
      border: 1px solid currentColor;
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 780;
    }

    .explosion-step.is-origin .explosion-number {
      border-color: color-mix(in srgb, var(--paper) 65%, var(--ink));
      font-size: 16px;
    }

    .explosion-copy { min-width: 0; }

    .explosion-title {
      margin: 0;
      color: inherit;
      font-size: 15px;
      font-weight: 820;
      line-height: 1.5;
    }

    .explosion-title small {
      margin-left: 8px;
      color: var(--signal);
      font-family: var(--font-mono);
      font-size: 10px;
      font-weight: 780;
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }

    .explosion-step.is-origin .explosion-title small { color: color-mix(in srgb, var(--signal) 40%, var(--paper)); }

    .explosion-description {
      margin: 1px 0 0;
      color: var(--muted);
      font-size: 12.5px;
      line-height: 1.7;
    }

    .explosion-step.is-origin .explosion-description {
      color: color-mix(in srgb, var(--paper) 76%, var(--ink));
    }

    .explosion-arrow {
      align-self: center;
      display: grid;
      height: 24px;
      place-items: center;
      color: var(--signal);
      font-size: 15px;
      line-height: 1;
    }

    .explosion-conditions {
      display: grid;
      grid-template-columns: max-content minmax(0, 1fr);
      gap: 8px 14px;
      margin: 16px 0 0;
      padding: 12px 14px;
      border: 1px dashed var(--muted);
      color: var(--muted);
      font-size: 12px;
      line-height: 1.7;
    }

    .explosion-conditions b {
      color: var(--ink);
      font-family: var(--font-mono);
      font-size: 10px;
      font-weight: 780;
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }

    .alignment-figure,
    .future-visions {
      margin: 20px 0 18px;
      border: 1px solid var(--ink);
      background: var(--paper);
    }

    .alignment-figure img {
      width: 100%;
      aspect-ratio: 3 / 2;
      object-fit: cover;
    }

    .alignment-figure figcaption,
    .future-visions figcaption {
      padding: 11px 14px 12px;
      border-top: 1px solid var(--ink);
      color: var(--muted);
      font-size: 12px;
      line-height: 1.65;
    }

    .alignment-position {
      margin: 20px 0 18px;
      padding: 22px;
      border: 1px solid var(--ink);
      background: var(--paper);
    }

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

    .alignment-position h3 {
      margin: 0 0 10px;
      font-size: clamp(19px, 2.5vw, 23px);
    }

    .alignment-principle {
      margin: 16px 0 0;
      padding-top: 14px;
      border-top: 1px solid var(--line);
      font-weight: 820;
    }

    .future-vision-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
      height: 270px;
    }

    .future-vision {
      min-width: 0;
      overflow: hidden;
    }

    .future-vision + .future-vision {
      border-left: 1px solid var(--ink);
    }

    .future-vision img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 180ms ease;
    }

    .future-vision:hover img,
    .future-vision:focus-visible img {
      transform: scale(1.015);
    }

    .future-vision:focus-visible {
      outline: 3px solid var(--signal);
      outline-offset: -3px;
    }

    @media (max-width: 520px) {
      .explosion-figure { padding: 16px; }

      .explosion-step {
        grid-template-columns: 34px minmax(0, 1fr);
        gap: 11px;
        padding: 13px;
      }

      .explosion-number {
        width: 34px;
        height: 34px;
      }

      .explosion-title small {
        display: block;
        margin: 1px 0 0;
      }

      .explosion-duo {
        grid-template-columns: 1fr;
        gap: 0;
      }

      .explosion-duo-link {
        height: 24px;
        transform: rotate(90deg);
      }

      .explosion-conditions { grid-template-columns: 1fr; }

      .alignment-position { padding: 17px; }

      .future-vision-grid {
        grid-template-columns: 1fr 1fr;
        height: 170px;
      }
    }

    .faq-list {
      display: grid;
      gap: 14px;
      margin-top: 18px;
    }

    .faq-item {
      border: 1px solid var(--ink);
      background: var(--paper);
    }

    .faq-item h3,
    .faq-answer {
      display: grid;
      grid-template-columns: 30px minmax(0, 1fr);
      align-items: start;
      gap: 14px;
      margin: 0;
      padding: 16px 20px;
    }

    .faq-item h3 { scroll-margin-top: 90px; }

    .faq-answer { border-top: 1px solid var(--line); }

    .faq-answer p { margin: 0; }

    .faq-body::after { content: ""; display: block; clear: both; }
    .faq-body .term-figure { margin-top: 2px; }

    .faq-mark {
      display: grid;
      width: 30px;
      height: 30px;
      place-items: center;
      border: 1px solid var(--ink);
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 780;
      line-height: 1;
    }

    .faq-item h3 .faq-mark {
      color: var(--paper);
      background: var(--ink);
    }

    .faq-answer .faq-mark {
      color: var(--signal);
      border-color: var(--signal);
    }

    @media (max-width: 520px) {
      .faq-item h3,
      .faq-answer {
        grid-template-columns: 26px minmax(0, 1fr);
        gap: 11px;
        padding: 14px;
      }

      .faq-answer p { font-size: 15px; }

      .faq-mark {
        width: 26px;
        height: 26px;
        font-size: 11px;
      }
    }

    .related {
      margin-top: 16px;
      padding: 14px 18px;
      border-left: 3px solid var(--signal);
      background: var(--paper);
      font-size: 14px;
    }

    .related b {
      display: block;
      margin-bottom: 6px;
      color: var(--signal);
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 780;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

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

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

    .glossary-cta {
      margin-top: 48px;
      padding: 24px;
      border: 1px solid var(--ink);
      background: var(--paper);
    }

    .glossary-cta p { margin: 0; }

    .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;
    }
  
    /* AGI Ruin記事と同じ強弱の装飾（要点のマーカー、章の色帯、引用） */
    main p strong, main li strong {
      font-weight: 800;
      background: linear-gradient(transparent 62%, rgba(255, 214, 10, 0.45) 62%);
    }
    html[data-color-mode="dark"] main p strong,
    html[data-color-mode="dark"] main li strong {
      background: linear-gradient(transparent 62%, rgba(255, 214, 10, 0.28) 62%);
    }
    main figure strong, main .summary-box strong, main .alignment-position strong { background: none; }
    section > h2 {
      padding: 12px 16px;
      border-left: 6px solid var(--signal);
      background: rgba(106, 168, 255, 0.12);
    }
    html[data-color-mode="dark"] section > h2 { border-left-color: #8dbcff; }
    .pull-quote {
      margin: 30px 0;
      padding: 18px 4px;
      border-top: 2px solid var(--ink);
      border-bottom: 2px solid var(--ink);
      font-size: 21px;
      font-weight: 800;
      line-height: 1.6;
      letter-spacing: 0.02em;
    }
    @media (max-width: 620px) {
      section > h2 { padding: 10px 12px; }
      .pull-quote { font-size: 18px; }
    }

    /* 用語の見出しを、用語ボックスと同じ太い線の札にする */
    section:not(#faq) h3[id] {
      margin-top: 30px;
      padding: 10px 14px;
      border: 2px solid var(--ink);
      border-left-width: 6px;
      font-size: 17px;
    }
    .term-figure {
      float: right;
      width: 120px;
      margin: 4px 0 10px 18px;
    }
    .term-figure img { display: block; width: 120px; height: 120px; object-fit: cover; border-radius: 4px; }
    section:not(#faq) h3[id] + p::after, section > p:last-child::after { content: ""; display: block; clear: both; }
    section h3 { clear: both; }
    @media (max-width: 520px) {
      .term-figure { width: 92px; margin-left: 12px; }
      .term-figure img { width: 92px; height: 92px; }
    }
  
    /* AGI入門の図1と同じ部品 */
    .figure {
      margin: 20px 0 6px;
      padding: 24px 22px;
      border: 1px solid var(--ink);
      background: var(--paper);
    }

    .figure figcaption {
      margin-bottom: 18px;
      color: var(--signal);
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 780;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }

    .spec-track {
      position: relative;
      height: 4px;
      margin: 0 8px 26px;
      background: linear-gradient(90deg, var(--line) 0%, var(--signal) 100%);
    }

    .spec-track::after {
      content: "";
      position: absolute;
      right: -8px;
      top: -4px;
      border-left: 8px solid var(--signal);
      border-top: 6px solid transparent;
      border-bottom: 6px solid transparent;
    }

    .spec-dot {
      position: absolute;
      top: -5px;
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: var(--paper);
      border: 3px solid var(--ink);
      transform: translateX(-50%);
    }

    .spec-dot.s2 { border-color: var(--signal); }
    .spec-dot.s3 { background: var(--signal); border-color: var(--signal); }

    .spec-cols {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 12px;
    }

    .spec-en {
      color: var(--signal);
      font-family: var(--font-mono);
      font-size: 10.5px;
      font-weight: 780;
      letter-spacing: 0.06em;
      text-transform: uppercase;
    }

    .spec-col b {
      display: block;
      font-size: 14.5px;
      font-weight: 820;
      line-height: 1.5;
    }

    .spec-col p {
      margin: 4px 0 0;
      color: var(--muted);
      font-size: 12px;
      line-height: 1.7;
    }

    .spec-axis {
      margin: 18px 0 0;
      text-align: right;
      color: var(--muted);
      font-family: var(--font-mono);
      font-size: 10.5px;
      letter-spacing: 0.06em;
    }
    @media (max-width: 620px) {
      .spec-track { display: none; }
      .spec-cols { grid-template-columns: 1fr; gap: 8px; }
    }

    /* 用語の最初の段落を「定義」のカードにする */
    .term-def {
      position: relative;
      margin: 0 0 14px;
      padding: 14px 18px 14px 18px;
      border-left: 4px solid var(--signal);
      background: rgba(106, 168, 255, 0.10);
    }
    .term-def::before {
      content: "定義";
      display: inline-block;
      margin-right: 8px;
      padding: 1px 8px;
      border-radius: 3px;
      background: var(--signal);
      color: #fff;
      font-size: 12px;
      font-weight: 800;
      letter-spacing: .08em;
      vertical-align: 2px;
    }
    html[data-color-mode="dark"] .term-def { background: rgba(106, 168, 255, 0.14); border-left-color: #8dbcff; }
    html[data-color-mode="dark"] .term-def::before { background: #8dbcff; color: #06131f; }

    .section-figure { margin: 6px 0 18px; }
    #agi .figure { margin: 22px 0 26px; }
    .section-figure img { display: block; width: 100%; height: auto; border-radius: 4px; }
    .section-figure figcaption { margin-top: 6px; font-size: 13px; color: var(--muted); }