:root {
      --brand: #193193;
      --brand-soft: rgba(25, 49, 147, 0.10);
      --blog: #7c3aed;
      --site: #193193;
      --ink: #111827;
      --muted: #6b7280;
      --line: #e5e7eb;
      --paper: #ffffff;
      --wash: #f8fafc;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }

    body {
      margin: 0;
      min-height: 100vh;
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans JP", "Segoe UI", sans-serif;
      color: var(--ink);
      background:
        radial-gradient(circle at top left, rgba(25, 49, 147, 0.13), transparent 34rem),
        linear-gradient(135deg, #f8fafc 0%, #f1f5f9 48%, rgba(25, 49, 147, 0.10) 100%);
      display: flex;
      justify-content: center;
      padding: 1rem;
      line-height: 1.75;
    }

    a { color: inherit; }

    .page {
      width: 100%;
      max-width: 44rem;
      background: var(--paper);
      border: 1px solid rgba(255, 255, 255, 0.7);
      border-radius: 2rem;
      overflow: hidden;
      box-shadow: 0 1.5rem 4rem rgba(25, 49, 147, 0.10);
      align-self: flex-start;
    }

    .bar { height: 0.5rem; background: var(--brand); }
    .inner { padding: 1.5rem; }
    @media (min-width: 720px) { .inner { padding: 2.2rem; } }

    header {
      text-align: center;
      margin-bottom: 1.6rem;
    }

    .site-label {
      margin: 0 0 0.55rem;
      color: var(--muted);
      font-size: 0.78rem;
      font-weight: 800;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }

    h1 {
      margin: 0;
      font-size: clamp(1.8rem, 6vw, 3rem);
      letter-spacing: -0.045em;
      line-height: 1.12;
    }

    .subtitle {
      margin: 0.75rem auto 0;
      color: var(--muted);
      font-weight: 600;
      max-width: 34rem;
      font-size: 0.95rem;
    }

    .article-card {
      background: #fff;
      border: 2px solid #f1f5f9;
      border-radius: 1.35rem;
      padding: 1.15rem;
      box-shadow: 0 0.25rem 0.75rem rgba(15, 23, 42, 0.04);
    }

    @media (min-width: 720px) {
      .article-card { padding: 1.5rem; }
    }

    .article-section h3 {
      margin: 0 0 1rem;
      font-size: 1.35rem;
      letter-spacing: -0.025em;
      line-height: 1.25;
    }

    .article-section h4 {
      margin: 1.35rem 0 0.45rem;
      font-size: 1rem;
      color: #374151;
      letter-spacing: -0.01em;
    }

    .article-body {
      color: #4b5563;
      font-size: 0.98rem;
    }

    .article-body p {
      margin: 0 0 1rem;
    }

    .article-figure {
      margin: 1.2rem 0 1.4rem;
      text-align: center;
    }

    .article-image {
      width: min(78%, 28rem);
      max-width: 100%;
      height: auto;
      border-radius: 1rem;
      border: 1px solid #eef2f7;
      box-shadow: 0 0.8rem 1.6rem rgba(15, 23, 42, 0.08);
    }

    .article-divider {
      border: 0;
      height: 1px;
      background: var(--line);
      margin: 2rem 0;
    }

    .section-title {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.6rem;
      margin: 1.5rem 0 0.85rem;
      color: #9ca3af;
      font-size: 0.74rem;
      font-weight: 800;
      letter-spacing: 0.16em;
      text-transform: uppercase;
    }

    .section-title::before,
    .section-title::after {
      content: "";
      width: 2rem;
      height: 1px;
      background: var(--line);
    }

    .link-stack {
      display: grid;
      gap: 0.9rem;
      margin-bottom: 1.5rem;
    }

    .link-card {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 1rem;
      padding: 0.95rem 1rem;
      text-decoration: none;
      background: #fff;
      border: 2px solid #f1f5f9;
      border-radius: 1.15rem;
      box-shadow: 0 0.25rem 0.75rem rgba(15, 23, 42, 0.04);
      transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
    }

    .link-card:hover,
    .link-card:focus-visible {
      transform: translateY(-0.15rem);
      border-color: var(--accent, var(--brand));
      box-shadow: 0 0.7rem 1.3rem rgba(15, 23, 42, 0.08);
      outline: none;
    }

    .link-main {
      min-width: 0;
    }

    .label {
      display: block;
      font-weight: 750;
      color: #374151;
    }

    .sub {
      display: block;
      margin-top: 0.1rem;
      color: #9ca3af;
      font-size: 0.78rem;
      font-weight: 600;
    }

    .arrow {
      color: #cbd5e1;
      font-size: 1.1rem;
      flex: 0 0 auto;
    }

    .notice {
      margin-top: 1.35rem;
      color: #9ca3af;
      font-size: 0.78rem;
      text-align: center;
    }

    footer {
      margin-top: 1.5rem;
      text-align: center;
      color: #9ca3af;
      font-size: 0.75rem;
    }