:root {
  --color-navy-950: #0d2238;
  --color-navy-800: #173b5f;
  --color-navy-700: #245477;
  --color-green-700: #26715d;
  --color-green-100: #e7f3ee;
  --color-blue-100: #edf5fa;
  --color-gray-900: #1e2933;
  --color-gray-700: #52616f;
  --color-gray-500: #778593;
  --color-gray-300: #ced7df;
  --color-gray-100: #f4f7f9;
  --color-white: #ffffff;
  --color-warning: #8a5b00;
  --color-warning-bg: #fff8df;
  --content-width: 1120px;
  --article-width: 780px;
  --radius: 12px;
  --shadow: 0 8px 26px rgba(13, 34, 56, 0.08);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--color-gray-900); background: var(--color-white); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif; font-size: 16px; line-height: 1.85; }
a { color: var(--color-navy-700); text-underline-offset: 0.2em; }
a:hover { color: var(--color-green-700); }
img { max-width: 100%; height: auto; }
.container { width: min(calc(100% - 40px), var(--content-width)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 100; top: 8px; left: 8px; padding: 8px 12px; color: var(--color-white); background: var(--color-navy-950); transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.site-header { border-bottom: 1px solid var(--color-gray-300); background: rgba(255,255,255,.97); }
.header-inner { display: flex; align-items: center; justify-content: space-between; min-height: 78px; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--color-navy-950); text-decoration: none; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 10px; color: var(--color-white); background: var(--color-navy-800); font-family: serif; font-size: 22px; font-weight: 700; }
.brand strong, .brand small { display: block; }
.brand strong { letter-spacing: .06em; }
.brand small { color: var(--color-gray-700); font-size: 11px; font-weight: 400; }
.global-nav { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.global-nav a { color: var(--color-gray-900); font-size: 14px; font-weight: 700; text-decoration: none; }
.hero { padding: 72px 0 64px; color: var(--color-white); background: linear-gradient(132deg, var(--color-navy-950), var(--color-navy-800) 68%, #1d6659); }
.hero-inner { max-width: 850px; }
.eyebrow { margin: 0 0 10px; color: #bfe3d7; font-size: 14px; font-weight: 700; letter-spacing: .12em; }
.hero h1 { margin: 0; font-family: Georgia, "Yu Mincho", serif; font-size: clamp(36px, 6vw, 62px); line-height: 1.3; letter-spacing: .06em; }
.hero-lead { max-width: 720px; margin: 20px 0 0; font-size: clamp(17px, 2.4vw, 21px); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 10px 20px; border: 1px solid var(--color-green-700); border-radius: 8px; color: var(--color-white); background: var(--color-green-700); font-weight: 700; text-decoration: none; }
.button:hover { color: var(--color-navy-950); background: var(--color-white); }
.button-secondary { border-color: rgba(255,255,255,.6); background: transparent; }
.section { padding: 64px 0; }
.section-muted { background: var(--color-gray-100); }
.section-heading { margin-bottom: 26px; }
.section-heading h2 { margin: 0 0 8px; color: var(--color-navy-950); font-size: clamp(25px, 4vw, 34px); line-height: 1.45; }
.section-heading p { max-width: 760px; margin: 0; color: var(--color-gray-700); }
.section-link { margin-top: 28px; }
.grid { display: grid; gap: 20px; }
.category-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.article-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.related-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { height: 100%; padding: 24px; border: 1px solid var(--color-gray-300); border-radius: var(--radius); background: var(--color-white); box-shadow: 0 1px 0 rgba(13,34,56,.02); }
.card:hover { border-color: #9fb5c4; box-shadow: var(--shadow); }
.card h2, .card h3 { margin: 0 0 8px; color: var(--color-navy-950); font-size: 19px; line-height: 1.55; }
.card p { margin: 0; color: var(--color-gray-700); font-size: 14px; }
.card a.card-link { color: inherit; text-decoration: none; }
.card .card-meta { margin-bottom: 8px; color: var(--color-green-700); font-size: 12px; font-weight: 700; }
.feature-card { border-top: 4px solid var(--color-green-700); }
.pathways { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.pathway { padding: 28px; border-radius: var(--radius); background: var(--color-blue-100); }
.pathway h3 { margin-top: 0; color: var(--color-navy-950); }
.related-sites { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.breadcrumbs { padding-top: 22px; color: var(--color-gray-700); font-size: 13px; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 5px; margin: 0; padding: 0; list-style: none; }
.breadcrumbs li:not(:last-child)::after { margin-left: 5px; content: "/"; color: var(--color-gray-500); }
.page-header { padding: 46px 0 40px; border-bottom: 1px solid var(--color-gray-300); background: var(--color-gray-100); }
.page-header-inner { max-width: 860px; }
.page-header h1 { margin: 0 0 12px; color: var(--color-navy-950); font-size: clamp(30px, 5vw, 46px); line-height: 1.4; }
.page-header p { margin: 0; color: var(--color-gray-700); font-size: 17px; }
.article-shell { display: grid; grid-template-columns: minmax(0, var(--article-width)) 250px; align-items: start; gap: 54px; padding-top: 46px; padding-bottom: 72px; }
.article-shell > article { min-width: 0; }
.article-header .category-label { display: inline-block; margin-bottom: 12px; padding: 3px 10px; border-radius: 999px; color: var(--color-green-700); background: var(--color-green-100); font-size: 13px; font-weight: 700; }
.article-header h1 { margin: 0; color: var(--color-navy-950); font-size: clamp(30px, 5vw, 45px); line-height: 1.45; }
.article-description { margin: 18px 0 0; color: var(--color-gray-700); font-size: 17px; }
.article-dates { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 18px 0 0; color: var(--color-gray-500); font-size: 13px; }
.toc { margin: 32px 0; padding: 24px; border: 1px solid var(--color-gray-300); border-radius: var(--radius); background: var(--color-gray-100); }
.toc-title { margin: 0 0 8px; color: var(--color-navy-950); font-weight: 700; }
.toc ol { margin: 0; padding-left: 1.4em; }
.toc .toc-level-3 { margin-left: 18px; font-size: 14px; }
.article-body { overflow-wrap: anywhere; }
.article-body h2 { margin: 2.2em 0 .8em; padding-bottom: .35em; border-bottom: 2px solid var(--color-navy-800); color: var(--color-navy-950); font-size: 27px; line-height: 1.5; }
.article-body h3 { margin: 1.8em 0 .6em; color: var(--color-navy-800); font-size: 21px; line-height: 1.55; }
.article-body p { margin: 1em 0; }
.article-body ul, .article-body ol { padding-left: 1.5em; }
.article-body li + li { margin-top: .35em; }
.article-body a { overflow-wrap: anywhere; }
.table-scroll { max-width: 100%; margin: 1.5em 0; overflow-x: auto; border: 1px solid var(--color-gray-300); border-radius: 8px; }
table { width: 100%; min-width: 600px; border-collapse: collapse; font-size: 15px; }
th, td { padding: 12px 14px; border-right: 1px solid var(--color-gray-300); border-bottom: 1px solid var(--color-gray-300); text-align: left; vertical-align: top; }
th { color: var(--color-navy-950); background: var(--color-blue-100); }
tr:last-child td { border-bottom: 0; }
th:last-child, td:last-child { border-right: 0; }
.note-box, .warning-box { margin: 1.6em 0; padding: 18px 20px; border-left: 5px solid var(--color-navy-700); border-radius: 6px; background: var(--color-blue-100); }
.warning-box { border-left-color: var(--color-warning); color: #61420b; background: var(--color-warning-bg); }
.disclaimer { margin-top: 42px; padding: 24px; border: 1px solid var(--color-gray-300); border-radius: var(--radius); background: var(--color-gray-100); }
.disclaimer h2 { margin: 0 0 8px; color: var(--color-navy-950); font-size: 18px; }
.disclaimer p { margin: 0; color: var(--color-gray-700); font-size: 13px; }
.link-panel { margin-top: 34px; padding-top: 24px; border-top: 1px solid var(--color-gray-300); }
.link-panel h2 { margin: 0 0 12px; color: var(--color-navy-950); font-size: 21px; }
.link-panel ul { margin: 0; padding-left: 1.4em; }
.related-card-section { margin-top: 38px; padding-top: 26px; border-top: 1px solid var(--color-gray-300); }
.related-card-section h2 { margin: 0 0 16px; color: var(--color-navy-950); font-size: 21px; }
.related-card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.related-card { display: grid; gap: 8px; padding: 18px; border: 1px solid var(--color-gray-300); border-radius: var(--radius); color: inherit; background: var(--color-white); text-decoration: none; }
.related-card:hover { border-color: var(--color-green-700); }
.related-card.is-cross-site { background: var(--color-blue-100); }
.related-card-meta { color: var(--color-green-700); font-size: 12px; font-weight: 700; }
.related-card h3 { margin: 0; color: var(--color-navy-950); font-size: 17px; line-height: 1.55; }
.related-card p { margin: 0; color: var(--color-gray-700); font-size: 14px; line-height: 1.7; }
.related-card-cta { color: var(--color-navy-800); font-size: 13px; font-weight: 700; }
.article-sidebar { position: sticky; top: 24px; padding: 20px; border-left: 1px solid var(--color-gray-300); font-size: 14px; }
.article-sidebar h2 { margin-top: 0; font-size: 16px; }
.article-sidebar ul { margin: 0; padding-left: 1.2em; }
.back-home { margin-top: 38px; }
.prose { width: min(calc(100% - 40px), var(--article-width)); margin: 0 auto; padding: 52px 0 72px; }
.prose h2 { margin-top: 2em; color: var(--color-navy-950); }
.prose h3 { color: var(--color-navy-800); }
.glossary-planned { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; list-style: none; }
.glossary-planned li { padding: 5px 10px; border: 1px solid var(--color-gray-300); border-radius: 999px; background: var(--color-white); font-size: 13px; }
.empty-state { padding: 28px; border: 1px dashed var(--color-gray-300); border-radius: var(--radius); color: var(--color-gray-700); background: var(--color-gray-100); }
.site-footer { padding: 45px 0 18px; color: #dce6ed; background: var(--color-navy-950); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 40px; }
.footer-title { color: var(--color-white); font-size: 18px; font-weight: 700; }
.footer-grid p { max-width: 640px; margin-top: 0; font-size: 13px; }
.footer-grid nav { display: grid; align-content: start; gap: 8px; }
.footer-grid a { color: var(--color-white); }
.copyright { margin: 34px 0 0; color: #9fb2c0; font-size: 12px; text-align: center; }

@media (max-width: 900px) {
  .category-grid, .article-grid, .pathways { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-shell { grid-template-columns: 1fr; }
  .article-sidebar { position: static; border-top: 1px solid var(--color-gray-300); border-left: 0; }
}

@media (max-width: 620px) {
  body { font-size: 15px; }
  .container { width: min(calc(100% - 28px), var(--content-width)); }
  .header-inner { align-items: flex-start; flex-direction: column; padding: 14px 0; }
  .global-nav { width: 100%; gap: 5px 16px; }
  .hero { padding: 48px 0; }
  .section { padding: 48px 0; }
  .category-grid, .article-grid, .related-grid, .related-card-grid, .pathways, .related-sites, .footer-grid { grid-template-columns: 1fr; }
  .card { padding: 20px; }
  .page-header { padding: 34px 0; }
  .article-shell { gap: 30px; padding-top: 32px; }
  .article-body h2 { font-size: 23px; }
  .table-scroll { margin-right: -14px; }
}