:root {
  --paper: #f3f0e8;
  --paper-deep: #e7e2d6;
  --ink: #202429;
  --muted: #666b6d;
  --navy: #243b53;
  --red: #ba3a2c;
  --sage: #b8c1aa;
  --line: #bbb8ae;
  --white: #fffdf7;
  --serif: "Noto Serif JP", serif;
  --sans: "Noto Sans JP", sans-serif;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
p, li { font-size: 15px; line-height: 1.95; }
h1, h2, h3 { margin: 0; font-family: var(--serif); letter-spacing: -.035em; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 100; padding: 10px 16px; color: #fff; background: var(--navy); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

.site-header { position: sticky; top: 0; z-index: 30; border-bottom: 1px solid var(--line); background: rgba(243, 240, 232, .96); backdrop-filter: blur(12px); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 32px; width: min(calc(100% - 48px), var(--max)); min-height: 76px; margin: auto; }
.brand { display: flex; align-items: center; gap: 12px; flex: none; }
.brand-mark { display: grid; width: 36px; height: 36px; place-items: center; color: var(--white); background: var(--red); font-family: var(--serif); font-size: 19px; font-weight: 900; }
.brand strong, .brand small { display: block; }
.brand strong { font-family: var(--serif); font-size: 17px; letter-spacing: .06em; }
.brand small { margin-top: 4px; color: var(--muted); font-size: 8px; letter-spacing: .17em; }
.site-nav { display: flex; align-items: stretch; align-self: stretch; }
.site-nav a { display: grid; place-items: center; padding: 0 15px; border-left: 1px solid transparent; color: #4f5559; font-size: 12px; font-weight: 600; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--red); border-color: var(--line); background: var(--white); }
.menu-button { display: none; }

main, .site-footer { width: min(calc(100% - 48px), var(--max)); margin-inline: auto; }
.home-hero { display: grid; grid-template-columns: .9fr 1.1fr; min-height: 500px; border-bottom: 1px solid var(--ink); }
.hero-copy { display: flex; flex-direction: column; justify-content: center; padding: 72px 64px 72px 0; border-right: 1px solid var(--ink); }
.eyebrow { margin: 0 0 24px; color: var(--red); font-size: 11px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; }
.hero-copy h1 { max-width: 9em; font-size: clamp(44px, 5.3vw, 68px); line-height: 1.38; }
.hero-copy > p:not(.eyebrow) { max-width: 38em; margin: 30px 0 0; color: var(--muted); }
.arrow-link { display: flex; justify-content: space-between; align-items: center; width: min(100%, 330px); margin-top: 40px; padding: 15px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); color: var(--navy); font-size: 13px; font-weight: 700; }
.arrow-link span { color: var(--red); font-size: 20px; transition: transform 160ms ease; }
.arrow-link:hover span { transform: translateX(5px); }
.hero-map { display: flex; flex-direction: column; justify-content: center; margin: 0; padding: 34px 0 28px 44px; }
.hero-map img { width: 100%; height: auto; object-fit: contain; border: 1px solid var(--ink); filter: saturate(.78) contrast(.94); }
.hero-map figcaption { margin-top: 10px; color: var(--muted); font-size: 10px; letter-spacing: .08em; }

.section-index { display: flex; align-items: baseline; gap: 14px; }
.section-index span { color: var(--red); font-family: var(--serif); font-size: 28px; font-weight: 900; }
.section-index p { margin: 0; color: var(--muted); font-size: 10px; font-weight: 700; letter-spacing: .15em; }
.evidence-strip { display: grid; grid-template-columns: 190px 1fr; padding: 32px 0; border-bottom: 1px solid var(--ink); }
.evidence-list { display: grid; grid-template-columns: repeat(4, 1fr); }
.evidence-item { padding: 2px 20px 0; border-left: 1px solid var(--line); }
.evidence-item time { color: var(--red); font-family: var(--serif); font-size: 15px; font-weight: 700; }
.evidence-item strong { display: block; margin-top: 8px; font-size: 13px; }
.evidence-item p { margin: 4px 0 0; color: var(--muted); font-size: 11px; line-height: 1.6; }

.home-section, .region-section, .reading-section, .article-timeline, .source-section, .next-section { padding: 104px 0 0; }
.section-heading { display: grid; grid-template-columns: 190px 1fr; margin-bottom: 42px; }
.section-heading > div:last-child { display: grid; grid-template-columns: minmax(0, .8fr) minmax(280px, .7fr); gap: 48px; }
.section-heading h2 { font-size: clamp(34px, 4.5vw, 52px); line-height: 1.45; }
.section-heading > div:last-child > p { margin: 8px 0 0; color: var(--muted); }
.section-heading.compact { align-items: end; padding-bottom: 24px; border-bottom: 1px solid var(--ink); }
.section-heading.compact h2 { font-size: clamp(28px, 3.5vw, 40px); }

.article-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px 24px; }
.story-card { border-top: 1px solid var(--ink); }
.story-card a { display: block; }
.story-card figure { margin: 0; overflow: hidden; border-bottom: 4px solid var(--red); background: var(--paper-deep); }
.story-card:nth-child(2n) figure { border-color: var(--navy); }
.story-card img { width: 100%; height: 220px; object-fit: cover; filter: saturate(.78); transition: transform 500ms cubic-bezier(.2,.75,.2,1), filter 180ms ease; }
.story-card:hover img { transform: scale(1.025); filter: saturate(.95); }
.story-meta { display: flex; justify-content: space-between; gap: 16px; margin-top: 16px; color: var(--muted); font-size: 10px; font-weight: 600; letter-spacing: .08em; }
.story-card h3 { margin-top: 12px; font-size: 23px; line-height: 1.45; }
.story-card > a > p { max-width: 48em; margin: 12px 0 0; color: var(--muted); font-size: 13px; }
.story-cta { display: inline-block; margin-top: 12px; color: var(--red); font-size: 12px; font-weight: 700; }

.region-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.region-item { min-height: 170px; padding: 28px 24px; border-right: 1px solid var(--line); }
.region-item:last-child { border-right: 0; }
.region-item::before { display: block; width: 20px; height: 4px; margin-bottom: 34px; background: var(--sage); content: ""; }
.region-item:nth-child(2)::before { background: var(--red); }
.region-item:nth-child(3)::before { background: var(--navy); }
.region-item strong { font-family: var(--serif); font-size: 18px; }
.region-item p { margin: 8px 0 0; color: var(--muted); font-size: 12px; }
.affiliate-note { margin: -26px 0 20px 190px; color: var(--muted); font-size: 11px; }
.reading-grid { display: grid; grid-template-columns: repeat(2, 1fr); margin-left: 190px; border-top: 1px solid var(--line); }
.book-card { display: grid; grid-template-columns: 1fr auto; gap: 20px; padding: 26px 24px 26px 0; border-bottom: 1px solid var(--line); }
.book-card:nth-child(odd) { padding-right: 32px; border-right: 1px solid var(--line); }
.book-card:nth-child(even) { padding-left: 32px; }
.book-card h3 { font-family: var(--sans); font-size: 15px; letter-spacing: 0; }
.book-card p { margin: 7px 0 0; color: var(--muted); font-size: 12px; }
.book-card a { align-self: center; color: var(--red); font-size: 12px; font-weight: 700; white-space: nowrap; }
.rakuten-recommend { display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 0; align-items: center; margin-top: 48px; padding: 28px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--line); }
.rakuten-recommend-copy { padding-right: 28px; }
.rakuten-recommend-copy .eyebrow { margin-bottom: 8px; }
.rakuten-recommend-copy h3 { font-family: var(--sans); font-size: 15px; letter-spacing: 0; }
.rakuten-recommend-copy > p:last-child { margin: 8px 0 0; color: var(--muted); font-size: 11px; line-height: 1.7; }
.rakuten-widget { min-width: 0; overflow: hidden; }

.site-footer { display: grid; grid-template-columns: 180px 1fr auto; gap: 32px; align-items: start; margin-top: 112px; padding: 40px 0 48px; border-top: 2px solid var(--ink); }
.footer-brand strong, .footer-brand span { display: block; }
.footer-brand strong { font-family: var(--serif); }
.footer-brand span { margin-top: 5px; color: var(--red); font-size: 9px; letter-spacing: .15em; }
.site-footer p, .site-footer small { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.7; }
.site-footer nav { display: flex; gap: 16px; font-size: 11px; }
.site-footer small { grid-column: 2; }

.article-main { max-width: 1180px; }
.breadcrumb { display: flex; flex-wrap: wrap; gap: 8px; padding: 18px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 10px; }
.breadcrumb a { text-decoration: underline; text-underline-offset: 3px; }
.article-hero { display: grid; grid-template-columns: .95fr 1.05fr; min-height: 460px; border-bottom: 1px solid var(--ink); }
.article-hero-copy { display: flex; flex-direction: column; justify-content: center; padding: 56px 60px 56px 0; }
.article-hero h1 { font-size: clamp(42px, 5.4vw, 68px); line-height: 1.36; }
.article-hero-copy > p:last-child { margin: 28px 0 0; color: var(--muted); }
.article-hero figure { margin: 0; padding-left: 40px; align-self: center; }
.article-hero img { width: 100%; height: 340px; object-fit: cover; border: 1px solid var(--ink); filter: saturate(.8); }
.fact-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--ink); }
.fact-item { padding: 26px 28px; border-right: 1px solid var(--line); }
.fact-item:last-child { border-right: 0; }
.fact-item span { display: block; color: var(--muted); font-size: 10px; letter-spacing: .1em; }
.fact-item strong { display: block; margin-top: 8px; color: var(--navy); font-family: var(--serif); font-size: 22px; }
.article-layout { display: grid; grid-template-columns: 210px minmax(0, 690px); gap: 72px; justify-content: center; padding-top: 96px; }
.article-toc { position: sticky; top: 104px; align-self: start; padding-top: 14px; border-top: 3px solid var(--red); }
.article-toc p { margin: 0 0 14px; font-size: 11px; font-weight: 700; }
.article-toc ol { display: grid; gap: 9px; margin: 0; padding-left: 20px; color: var(--muted); }
.article-toc a { font-size: 11px; line-height: 1.55; }
.article-toc a:hover { color: var(--red); }
.article-section { padding: 0 0 72px; }
.article-section + .article-section { padding-top: 4px; border-top: 1px solid var(--line); }
.article-section .chapter-no { display: block; margin: 28px 0 8px; color: var(--red); font-family: var(--serif); font-size: 13px; font-weight: 900; }
.article-section:first-child .chapter-no { margin-top: 0; }
.article-section h2 { font-size: clamp(28px, 3.4vw, 38px); line-height: 1.5; }
.article-section p { margin: 24px 0 0; color: #42474a; font-size: 16px; line-height: 2.15; }
.timeline-row { display: grid; grid-template-columns: repeat(3, 1fr); }
.timeline-entry { padding: 28px; border-left: 1px solid var(--line); }
.timeline-entry:first-child { border-left: 0; }
.timeline-entry time { color: var(--red); font-family: var(--serif); font-weight: 700; }
.timeline-entry h3 { margin-top: 14px; font-size: 19px; }
.timeline-entry p { margin: 8px 0 0; color: var(--muted); font-size: 12px; }
.source-section { max-width: 900px; margin-inline: auto; }
.source-section h2 { padding-bottom: 16px; border-bottom: 1px solid var(--ink); font-size: 28px; }
.source-section > p { color: var(--muted); }
.source-section ul { margin: 20px 0 0; padding: 0; list-style: none; }
.source-section li { padding: 14px 0; border-top: 1px solid var(--line); font-size: 12px; }
.source-section a { color: var(--navy); text-decoration: underline; text-underline-offset: 4px; }
.next-section { border-top: 1px solid var(--ink); }
.next-section > p { margin: 0 0 20px; color: var(--red); font-size: 11px; font-weight: 700; letter-spacing: .14em; }
.next-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.next-card { display: grid; grid-template-columns: 120px 1fr; gap: 20px; align-items: center; padding: 12px 0; border-bottom: 1px solid var(--line); }
.next-card img { width: 120px; height: 96px; object-fit: cover; }
.next-card small { color: var(--red); }
.next-card h3 { margin-top: 6px; font-size: 17px; }
.reveal { opacity: 0; transform: translateY(16px); transition: opacity 520ms ease, transform 520ms ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
  .site-nav { position: absolute; top: 100%; right: 0; left: 0; display: none; padding: 12px 24px 20px; border-bottom: 1px solid var(--ink); background: var(--paper); }
  .site-nav[data-open="true"] { display: grid; }
  .site-nav a { display: block; padding: 13px 0; border-bottom: 1px solid var(--line); }
  .menu-button { display: grid; grid-template-columns: 20px auto; align-items: center; gap: 2px 9px; padding: 8px 0; border: 0; color: var(--ink); background: none; }
  .menu-button span { grid-column: 1; display: block; width: 19px; height: 1px; background: var(--ink); }
  .menu-button b { grid-column: 2; grid-row: 1 / span 3; font-family: var(--sans); font-size: 11px; }
  .home-hero, .article-hero { grid-template-columns: 1fr; }
  .hero-copy { padding-right: 0; border-right: 0; }
  .hero-map, .article-hero figure { padding: 0 0 48px; }
  .evidence-strip, .section-heading { grid-template-columns: 150px 1fr; }
  .evidence-list { grid-template-columns: repeat(2, 1fr); }
  .evidence-item:nth-child(-n+2) { padding-bottom: 20px; }
  .article-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 20px; }
  .story-card img { height: 230px; }
  .region-grid { grid-template-columns: repeat(2, 1fr); }
  .region-item:nth-child(2) { border-right: 0; }
  .region-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .article-layout { grid-template-columns: 170px minmax(0, 1fr); gap: 40px; }
  .rakuten-recommend { grid-template-columns: 150px minmax(0, 1fr); }
}

@media (max-width: 640px) {
  main, .site-footer, .header-inner { width: min(calc(100% - 32px), var(--max)); }
  .header-inner { min-height: 66px; }
  .brand strong { font-size: 15px; }
  .brand small { display: none; }
  .brand-mark { width: 32px; height: 32px; }
  .home-hero { min-height: 0; }
  .hero-copy { min-height: 430px; padding: 54px 0 44px; }
  .hero-copy h1, .article-hero h1 { font-size: clamp(38px, 11.5vw, 52px); }
  .hero-map { padding-bottom: 28px; }
  .evidence-strip { grid-template-columns: 1fr; gap: 22px; padding: 26px 0; }
  .evidence-list { grid-template-columns: 1fr; }
  .evidence-item { padding: 14px 0; border-top: 1px solid var(--line); border-left: 0; }
  .home-section, .region-section, .reading-section, .article-timeline, .source-section, .next-section { padding-top: 76px; }
  .section-heading, .section-heading > div:last-child { grid-template-columns: 1fr; gap: 24px; }
  .section-heading h2 { font-size: 34px; }
  .article-grid { grid-template-columns: 1fr; }
  .story-card h3 { font-size: 24px; }
  .story-card img { height: 190px; }
  .region-grid { grid-template-columns: 1fr; }
  .region-item { min-height: 130px; border-right: 0; border-bottom: 1px solid var(--line); }
  .affiliate-note, .reading-grid { margin-left: 0; }
  .reading-grid { grid-template-columns: 1fr; }
  .book-card:nth-child(n) { padding: 22px 0; border-right: 0; }
  .rakuten-recommend { grid-template-columns: 1fr; gap: 20px; }
  .rakuten-recommend-copy { padding-right: 0; }
  .rakuten-widget { width: 300px; max-width: 100%; margin-inline: auto; }
  .site-footer { grid-template-columns: 1fr; margin-top: 80px; }
  .site-footer small { grid-column: 1; }
  .article-hero { min-height: 0; }
  .article-hero-copy { padding: 54px 0 40px; }
  .article-hero figure { padding-left: 0; }
  .article-hero img { height: 210px; }
  .fact-grid { grid-template-columns: 1fr; }
  .fact-item { padding: 18px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .fact-item:last-child { border-bottom: 0; }
  .article-layout { grid-template-columns: 1fr; padding-top: 64px; }
  .article-toc { position: static; }
  .article-section p { font-size: 15px; }
  .timeline-row { grid-template-columns: 1fr; }
  .timeline-entry { padding: 22px 0; border-top: 1px solid var(--line); border-left: 0; }
  .next-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}