:root {
  --navy: #00203e;
  --navy-soft: #173b5c;
  --red: #b42b2e;
  --ink: #17212b;
  --muted: #56616c;
  --line: #d7dee5;
  --paper: #ffffff;
  --wash: #f4f7f9;
  --content: 72rem;
  --sans: "Noto Sans JP", "Noto Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: "Noto Serif JP", "Noto Serif", Georgia, serif;
}

* { box-sizing: border-box; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.75;
}
a { color: #005a9c; text-underline-offset: .2em; }
a:hover { color: var(--red); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--red); outline-offset: 3px; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; padding: .6rem 1rem; color: #fff; background: var(--navy); }
.skip-link:focus { top: 1rem; }
.site-header { position: sticky; top: 0; z-index: 10; color: #fff; background: var(--navy); border-bottom: 4px solid var(--red); }
.header-inner { width: min(calc(100% - 2rem), var(--content)); margin: auto; display: flex; align-items: center; justify-content: flex-end; gap: 1rem; min-height: 4.5rem; }
.nav-toggle { display: none; padding: .45rem .65rem; color: #fff; background: transparent; border: 1px solid #fff; border-radius: .2rem; font: inherit; }
.site-nav ul { display: flex; flex-wrap: wrap; align-items: center; gap: .2rem 1rem; margin: 0; padding: 0; list-style: none; }
.site-nav a { color: #fff; font-size: .9rem; text-decoration: none; }
.site-nav a:hover { text-decoration: underline; }
.language-link { padding: .25rem .5rem; border: 1px solid rgba(255,255,255,.65); border-radius: .2rem; }
.hero { color: #fff; background: linear-gradient(125deg, var(--navy), var(--navy-soft)); }
.hero-inner { width: min(calc(100% - 2rem), var(--content)); margin: auto; padding: clamp(4rem, 10vw, 7.5rem) 0; }
.eyebrow { margin: 0 0 .5rem; color: #dcebf5; font-size: .9rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
h1, h2, h3 { font-family: var(--sans); line-height: 1.3; }
h1 { max-width: 16ch; margin: 0; font-size: clamp(2.15rem, 5.5vw, 4rem); letter-spacing: .02em; }
.hero .lead { max-width: 52rem; margin: 1.5rem 0 0; font-size: clamp(1.05rem, 2.4vw, 1.35rem); }
.hero-links { display: flex; flex-wrap: wrap; gap: .5rem 1.4rem; margin: 1.5rem 0 0; }
.hero-links a { color: #fff; font-weight: 700; }
main section { scroll-margin-top: 6rem; }
.section { width: min(calc(100% - 2rem), var(--content)); margin: auto; padding: clamp(3.5rem, 7vw, 6rem) 0; }
.section + .section { border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 1fr; gap: .5rem; margin-bottom: 2rem; }
.section-heading h2 { margin: 0; color: var(--navy); font-size: clamp(1.8rem, 4vw, 2.6rem); }
.section-heading p { margin: 0; color: var(--muted); }
.entries { display: grid; gap: 0; }
.entry { display: grid; grid-template-columns: 5rem 1fr; gap: 1.25rem; padding: 1.4rem 0; border-top: 1px solid var(--line); }
.entry-year { color: var(--red); font-weight: 800; font-variant-numeric: tabular-nums; }
.entry h3 { margin: 0 0 .35rem; font-family: var(--sans); font-size: 1.05rem; }
.entry p { margin: .15rem 0; }
.authors, .meta { color: var(--muted); }
.publication-note { display: inline-block; margin-left: .5rem; padding: .05rem .45rem; color: var(--red); border: 1px solid currentColor; border-radius: .2rem; font-size: .85em; font-weight: 700; }
.me { color: var(--ink); text-decoration: underline; text-decoration-thickness: .12em; text-underline-offset: .18em; }
.entry-links { display: flex; flex-wrap: wrap; gap: .4rem .9rem; margin-top: .35rem; }
.year-group h3 { margin: 2.5rem 0 .5rem; color: var(--red); font-family: var(--sans); font-size: 1.2rem; }
.year-group:first-child h3 { margin-top: 0; }
.subsection-title { margin: 3rem 0 1rem; color: var(--navy); font-size: 1.35rem; }
.timeline { margin: 0; padding: 0; list-style: none; }
.timeline li { display: grid; grid-template-columns: minmax(10rem, 14rem) 1fr; gap: 1.5rem; padding: 1rem 0; border-top: 1px solid var(--line); }
.period { color: var(--muted); font-variant-numeric: tabular-nums; }
.timeline strong { color: var(--navy); }
.notice { padding: 1rem 1.2rem; background: var(--wash); border-left: 4px solid var(--red); }
.contact-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
.contact-grid h3 { color: var(--navy); }
.site-footer { color: #fff; background: var(--navy); }
.footer-inner { width: min(calc(100% - 2rem), var(--content)); margin: auto; padding: 2rem 0; display: flex; justify-content: space-between; gap: 1rem; }
.footer-inner p { margin: 0; }
.status { color: var(--muted); }

@media (max-width: 54rem) {
  .nav-toggle { display: block; }
  .site-nav { position: absolute; inset: 4.5rem 0 auto; display: none; padding: 1rem; background: var(--navy); border-bottom: 4px solid var(--red); }
  .site-nav.open { display: block; }
  .site-nav ul { width: min(100%, var(--content)); margin: auto; display: grid; }
  .site-nav a { display: block; padding: .45rem 0; }
  .section-heading { grid-template-columns: 1fr; gap: .5rem; }
}
@media (max-width: 38rem) {
  .entry, .timeline li, .contact-grid { grid-template-columns: 1fr; gap: .3rem; }
  .footer-inner { display: block; }
  .footer-inner p + p { margin-top: .5rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print { .site-header, .skip-link, .nav-toggle { display: none; } .hero { color: #000; background: none; } a { color: #000; } }