*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    :root {
      --bg: #ffffff;
      --bg2: #f5f5f7;
      --text: #1d1d1f;
      --text2: #6e6e73;
      --accent: #0071e3;
      --border: #d2d2d7;
      --radius: 14px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
      background: var(--bg); color: var(--text);
      -webkit-font-smoothing: antialiased;
    }

    /* NAV */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 999;
      height: 52px;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,0,0,0.08);
      display: flex; align-items: center; justify-content: space-between;
      padding: 0 24px;
    }
    .nav-back { font-size: 0.82rem; color: var(--accent); text-decoration: none; }
    .nav-back:hover { opacity: 0.7; }
    .nav-title { font-size: 0.85rem; font-weight: 600; color: var(--text); }
    .nav-links { display: flex; gap: 1.5rem; list-style: none; }
    .nav-links a { font-size: 0.78rem; color: var(--text2); text-decoration: none; }
    .nav-links a:hover { color: var(--text); }
    @media (max-width: 480px) { .nav-title { display: none; } }

    /* ARTICLE LAYOUT */
    .article-wrap {
      max-width: 720px;
      margin: 0 auto;
      padding: 100px 24px 80px;
    }

    /* BREADCRUMB */
    .breadcrumb {
      font-size: 0.75rem; color: var(--text2);
      margin-bottom: 2rem;
      display: flex; gap: 6px; align-items: center;
    }
    .breadcrumb a { color: var(--accent); text-decoration: none; }
    .breadcrumb a:hover { opacity: 0.7; }
    .breadcrumb span { color: var(--border); }

    /* ARTICLE HEADER */
    .article-category {
      display: inline-block;
      font-size: 0.7rem; font-weight: 600;
      letter-spacing: 0.1em; text-transform: uppercase;
      color: var(--accent);
      background: rgba(0,113,227,0.08);
      padding: 4px 10px; border-radius: 980px;
      margin-bottom: 1.2rem;
    }
    .article-title {
      font-size: clamp(1.9rem, 4vw, 2.8rem);
      font-weight: 700; letter-spacing: -0.03em;
      line-height: 1.15; color: var(--text);
      margin-bottom: 1.2rem;
    }
    .article-subtitle {
      font-size: 1.15rem; color: var(--text2);
      line-height: 1.6; margin-bottom: 1.8rem;
      font-weight: 400;
    }
    .article-meta {
      display: flex; gap: 1.5rem; align-items: center;
      font-size: 0.8rem; color: var(--text2);
      padding-bottom: 2rem;
      border-bottom: 1px solid var(--border);
      margin-bottom: 2.8rem;
      flex-wrap: wrap;
    }
    .meta-author { display: flex; gap: 8px; align-items: center; }
    .meta-author-avatar {
      width: 32px; height: 32px; border-radius: 50%;
      background: var(--accent);
      display: flex; align-items: center; justify-content: center;
      font-size: 0.75rem; font-weight: 700; color: #fff;
      flex-shrink: 0;
    }
    .meta-author-name { font-weight: 600; color: var(--text); }
    .meta-dot { color: var(--border); }

    /* ARTICLE BODY */
    .article-body {
      font-size: 1.02rem;
      line-height: 1.78;
      color: var(--text);
    }
    .article-body h2 {
      font-size: 1.55rem; font-weight: 700;
      letter-spacing: -0.02em; line-height: 1.2;
      margin: 2.8rem 0 1rem;
      color: var(--text);
    }
    .article-body h3 {
      font-size: 1.15rem; font-weight: 700;
      letter-spacing: -0.01em; line-height: 1.3;
      margin: 2rem 0 0.75rem;
      color: var(--text);
    }
    .article-body p {
      margin-bottom: 1.4rem;
    }
    .article-body ul, .article-body ol {
      padding-left: 1.5rem;
      margin-bottom: 1.4rem;
    }
    .article-body li {
      margin-bottom: 0.5rem;
    }
    .article-body strong { font-weight: 600; }
    .article-body em { font-style: italic; color: var(--text2); }
    .article-body a { color: var(--accent); text-decoration: none; }
    .article-body a:hover { text-decoration: underline; }

    /* CALLOUT BOX */
    .callout {
      background: var(--bg2);
      border-left: 3px solid var(--accent);
      border-radius: 0 var(--radius) var(--radius) 0;
      padding: 1.2rem 1.4rem;
      margin: 1.8rem 0;
      font-size: 0.95rem;
    }
    .callout.warn {
      border-left-color: #FF9500;
      background: #FFF9F0;
    }
    .callout.success {
      border-left-color: #28CD41;
      background: #F0FFF4;
    }
    .callout-label {
      font-size: 0.7rem; font-weight: 700;
      letter-spacing: 0.08em; text-transform: uppercase;
      color: var(--accent); margin-bottom: 0.4rem;
    }
    .callout.warn .callout-label { color: #FF9500; }
    .callout.success .callout-label { color: #28CD41; }

    /* CASCADE DIAGRAM */
    .cascade-diagram {
      background: var(--bg2);
      border-radius: var(--radius);
      padding: 2rem;
      margin: 2rem 0;
      display: flex;
      flex-direction: column;
      gap: 0;
      overflow: hidden;
    }
    .cascade-level {
      display: flex; align-items: stretch;
      gap: 0;
    }
    .cascade-connector {
      display: flex; flex-direction: column; align-items: center;
      width: 36px; flex-shrink: 0; padding-top: 4px;
    }
    .cascade-connector-line {
      width: 2px; background: var(--border); flex: 1;
      min-height: 16px;
    }
    .cascade-connector-arrow {
      font-size: 1rem; color: var(--border); line-height: 1;
      margin: 2px 0;
    }
    .cascade-box {
      flex: 1;
      border-radius: 10px;
      padding: 14px 18px;
      margin-bottom: 4px;
    }
    .cascade-box-label {
      font-size: 0.65rem; font-weight: 700;
      letter-spacing: 0.1em; text-transform: uppercase;
      margin-bottom: 3px;
    }
    .cascade-box-title {
      font-size: 0.92rem; font-weight: 700;
      line-height: 1.3;
    }
    .cascade-box-sub {
      font-size: 0.78rem; margin-top: 4px;
      opacity: 0.75;
    }
    .c-national  { background: #E8F0FB; } .c-national .cascade-box-label  { color: #1a4b8c; }
    .c-rpjmd     { background: #EBF5FF; } .c-rpjmd .cascade-box-label     { color: #0071e3; }
    .c-renstra   { background: #F0F9FF; } .c-renstra .cascade-box-label   { color: #32ADE6; }
    .c-renja     { background: #F5FBFF; } .c-renja .cascade-box-label     { color: #5AC8FA; }
    .c-subkeg    { background: #F0FFF7; } .c-subkeg .cascade-box-label    { color: #28CD41; }

    /* TABLE */
    .article-body table {
      width: 100%; border-collapse: collapse;
      margin: 1.8rem 0; font-size: 0.88rem;
    }
    .article-body th {
      background: var(--bg2); font-weight: 600;
      padding: 10px 14px; text-align: left;
      border-bottom: 2px solid var(--border);
      font-size: 0.8rem;
    }
    .article-body td {
      padding: 10px 14px;
      border-bottom: 1px solid var(--bg2);
      vertical-align: top;
    }
    .article-body tr:last-child td { border-bottom: none; }
    .article-body tr:hover td { background: var(--bg2); }

    /* TAG */
    .tag {
      display: inline-block; font-size: 0.72rem; font-weight: 500;
      padding: 3px 9px; border-radius: 980px;
      background: var(--bg2); color: var(--text2);
      margin-right: 4px;
    }

    /* ARTICLE FOOTER */
    .article-footer {
      margin-top: 4rem;
      padding-top: 2rem;
      border-top: 1px solid var(--border);
    }
    .article-footer-label {
      font-size: 0.75rem; font-weight: 600;
      letter-spacing: 0.08em; text-transform: uppercase;
      color: var(--text2); margin-bottom: 1rem;
    }
    .article-tags { margin-bottom: 2rem; }
    .author-card {
      background: var(--bg2);
      border-radius: var(--radius);
      padding: 1.5rem;
      display: flex; gap: 1.2rem; align-items: flex-start;
    }
    .author-card-avatar {
      width: 52px; height: 52px; border-radius: 50%;
      background: var(--accent);
      display: flex; align-items: center; justify-content: center;
      font-size: 1.1rem; font-weight: 700; color: #fff;
      flex-shrink: 0;
    }
    .author-card-name { font-weight: 700; font-size: 0.95rem; margin-bottom: 3px; }
    .author-card-title { font-size: 0.8rem; color: var(--text2); margin-bottom: 0.6rem; }
    .author-card-desc { font-size: 0.85rem; color: var(--text2); line-height: 1.5; }
    .btn-back {
      display: inline-flex; align-items: center; gap: 6px;
      margin-top: 2rem;
      background: var(--bg2); color: var(--text);
      padding: 12px 22px; border-radius: 980px;
      font-size: 0.88rem; font-weight: 500;
      text-decoration: none; transition: background 0.2s;
    }
    .btn-back:hover { background: #e5e5ea; }

    /* FOOTER */
    footer {
      background: #f5f5f7;
      border-top: 1px solid var(--border);
      padding: 24px;
      text-align: center;
      font-size: 0.78rem; color: var(--text2);
      margin-top: 60px;
    }
    footer a { color: var(--text2); text-decoration: none; }
    footer a:hover { color: var(--text); }

    /* REVEAL */
    .reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
    .reveal.on { opacity: 1; transform: none; }
    .reveal-d1 { transition-delay: 0.1s; }
    .reveal-d2 { transition-delay: 0.2s; }
  
    /* MOBILE NAV (hamburger) */
    .nav-burger { display: none; background: none; border: 0; cursor: pointer; padding: 0; width: 34px; height: 34px; flex-direction: column; align-items: center; justify-content: center; gap: 5px; flex-shrink: 0; }
    .nav-burger span { display: block; width: 18px; height: 2px; border-radius: 2px; background: var(--text, #1d1d1f); transition: transform .25s ease, opacity .2s ease; }
    nav.nav-open .nav-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    nav.nav-open .nav-burger span:nth-child(2) { opacity: 0; }
    nav.nav-open .nav-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
    @media (max-width: 768px) {
      .nav-burger { display: flex; }
      .nav-links {
        display: none; position: fixed; top: 52px; left: 0; right: 0;
        flex-direction: column; gap: 0; list-style: none;
        background: rgba(255,255,255,0.97);
        backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(0,0,0,0.08);
        box-shadow: 0 16px 32px rgba(0,0,0,0.08);
        padding: 6px 16px 14px; max-height: calc(100vh - 52px); overflow-y: auto;
      }
      nav.nav-open .nav-links { display: flex; }
      .nav-links li { width: 100%; }
      .nav-links a { display: block; padding: 13px 6px; font-size: 0.95rem; border-bottom: 1px solid rgba(0,0,0,0.05); }
      .nav-links li:last-child > a { border-bottom: 0; }
    }