/* Shared by the Japanese and English articles. No external fonts or libraries. */
:root {
  color-scheme: light;
  --paper: #faf9f6;
  --ink: #222b2a;
  --muted: #65716c;
  --line: #d9dfd9;
  --accent: #256457;
  --wash: #eef2ed;
  --serif: Georgia, "Yu Mincho", "Hiragino Mincho ProN", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 2rem; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-underline-offset: .23em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
img { display: block; max-width: 100%; height: auto; }
::selection { background: #d8e8db; }
.shell { width: min(1160px, calc(100% - 96px)); margin-inline: auto; }
.skip-link { position: absolute; top: -100px; left: 20px; z-index: 10; padding: 12px 20px; background: white; }
.skip-link:focus { top: 12px; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 27px 0; border-bottom: 1px solid var(--line); }
.wordmark { color: var(--ink); text-decoration: none; font-size: 20px; font-weight: 750; letter-spacing: -.045em; }
.languages { display: flex; gap: 8px; align-items: center; font-size: 13px; }
.languages a, .languages span { padding: 6px 11px; }
.languages [aria-current] { color: var(--ink); background: #e9ede7; border-radius: 3px; font-weight: 650; }
.languages a { text-decoration: none; }
.languages a:hover { text-decoration: underline; }
.hero { padding: 75px 0 55px; }
.eyebrow { color: var(--accent); font-size: 11px; letter-spacing: .13em; font-weight: 650; margin: 0 0 24px; }
h1 { font-size: clamp(54px, 7.5vw, 94px); font-weight: 550; letter-spacing: -.065em; line-height: 1; margin: 0 0 25px; }
.subtitle { font-size: clamp(23px, 2.7vw, 33px); font-weight: 500; line-height: 1.65; letter-spacing: -.025em; margin: 0; max-width: 900px; text-wrap: balance; }
.hero-intro { font-size: 16px; line-height: 2; max-width: 785px; margin: 27px 0 0; }
.hero-download { margin-top: 28px; }
.download-button { display: inline-flex; align-items: center; justify-content: center; gap: 16px; max-width: 100%; min-height: 48px; padding: 14px 24px; border-radius: 4px; background: var(--accent); color: white; font-size: 15px; font-weight: 650; line-height: 1.6; text-decoration: none; }
.download-button:hover { background: #1c4d43; }
.download-note { margin: 10px 0 0; color: var(--muted); font-size: 12px; line-height: 1.8; }
.metadata { color: var(--muted); display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 25px; font-size: 11px; letter-spacing: .025em; }
.independence-notice { max-width: 785px; margin: 20px 0 0; color: var(--muted); font-size: 12px; line-height: 1.9; }
.hero-figure { margin: 0 0 67px; }
.hero-figure .image-stage { background: #eaf0ec; padding: 10px 36px; border: 1px solid #e0e7df; }
.hero-figure img { width: min(100%, 800px); margin: auto; }
.figure-link { display: block; cursor: zoom-in; }
.figure-link:hover img { opacity: .96; }
figcaption { color: var(--muted); font-size: 12px; line-height: 1.9; margin-top: 13px; }
.figure-number { color: var(--accent); font-size: 10px; font-weight: 700; letter-spacing: .1em; margin-right: 9px; white-space: nowrap; }
.article-grid { display: grid; grid-template-columns: 190px minmax(0, 1fr); column-gap: 74px; align-items: start; }
.contents { position: sticky; top: 35px; padding-top: 9px; }
.contents-title { color: var(--muted); font-size: 11px; font-weight: 600; letter-spacing: .12em; margin: 0 0 20px; }
.contents ol { list-style: none; padding: 0; margin: 0; counter-reset: contents; }
.contents li { counter-increment: contents; border-bottom: 1px solid var(--line); }
.contents a { display: flex; gap: 12px; color: var(--muted); font-size: 12px; line-height: 1.7; padding: 12px 0; text-decoration: none; }
.contents a::before { content: counter(contents, decimal-leading-zero); font-size: 10px; color: #86928c; padding-top: 2px; }
.contents a:hover { color: var(--accent); }
.contents-note { font-size: 11px; line-height: 1.8; color: var(--muted); margin-top: 24px; }
.article-section { border-top: 1px solid var(--line); padding: 33px 0 49px; }
.section-number { color: var(--accent); font-size: 11px; letter-spacing: .12em; font-weight: 600; margin: 0 0 13px; }
h2 { font-size: 27px; line-height: 1.6; font-weight: 600; letter-spacing: -.035em; margin: 0 0 24px; text-wrap: balance; }
h3 { font-size: 17px; line-height: 1.7; font-weight: 600; margin: 28px 0 10px; }
.article-section p, .article-section li, .article-section dd { font-size: 15px; line-height: 2.05; }
.article-section p { margin: 0 0 19px; }
.article-section p:last-child { margin-bottom: 0; }
.article-section strong { font-weight: 650; }
.article-section ul { padding-left: 1.3em; margin: 0 0 23px; }
.article-section li { padding-left: .15em; margin-bottom: 8px; }
.terms { margin: 28px 0 6px; border-top: 1px solid var(--line); }
.terms > div { display: grid; grid-template-columns: 132px 1fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.terms dt { font-size: 13px; font-weight: 600; line-height: 2; padding-top: 1px; }
.terms dd { margin: 0; color: var(--muted); font-size: 14px; }
.article-section figure { margin: 32px 0 27px; }
.image-stage { background: var(--wash); overflow: hidden; border-radius: 3px; }
.article-section .image-stage { padding: 14px; }
.article-section .image-stage img { margin: auto; }
.article-section .image-stage.editor { padding: 0; background: #0599b4; }
.article-section .image-stage.game { padding: 25px; background: #e8ebe4; }
.article-section figcaption { font-size: 12px; }
.note { border-left: 2px solid #90aa97; padding: 3px 0 3px 20px; margin: 27px 0; }
.article-section .note p { font-size: 13px; color: var(--muted); line-height: 1.95; }
code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .91em; }
p code { background: #e9eee7; padding: 2px 5px; border-radius: 3px; }
.code-example { background: #eaf0e9; border: 1px solid #dce5da; border-radius: 3px; padding: 24px 28px; margin: 27px 0; }
.code-label { display: flex; justify-content: space-between; gap: 15px; color: var(--accent); font-size: 10px; letter-spacing: .07em; }
pre { overflow-x: auto; font-size: 16px; line-height: 1.9; margin: 18px 0 0; color: #224b40; }
.references { list-style: none; padding: 0 !important; border-top: 1px solid var(--line); margin-top: 25px !important; }
.references li { padding: 18px 0; margin: 0; border-bottom: 1px solid var(--line); }
.references a { font-size: 15px; font-weight: 600; }
.references span { display: block; font-size: 12px; color: var(--muted); line-height: 1.8; margin-top: 4px; }
.site-footer { border-top: 1px solid var(--line); margin-top: 30px; padding: 28px 0 42px; display: flex; justify-content: space-between; gap: 25px; align-items: baseline; font-size: 11px; color: var(--muted); line-height: 1.9; }
.site-footer p { margin: 0; }
.site-footer a { white-space: nowrap; }
.footer-notices { max-width: 850px; }
.site-footer .footer-notices p + p { margin-top: 9px; }
.faq-topics { display: flex; flex-wrap: wrap; gap: 8px; font-size: 12px; line-height: 1.9; margin: 24px 0 30px; color: var(--muted); }
.faq-group { margin-top: 35px; scroll-margin-top: 30px; }
.faq-group h3 { font-size: 20px; margin-bottom: 20px; }
.article-section .faq-byline { color: var(--muted); font-size: 12px; }
.faq-item { border-top: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item summary { cursor: pointer; padding: 19px 28px 19px 0; font-size: 14px; font-weight: 550; line-height: 1.85; list-style: none; position: relative; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 3px; top: 18px; color: var(--accent); font-size: 19px; font-weight: 400; }
.faq-item[open] summary::after { content: "−"; }
.faq-item summary:hover { color: var(--accent); }
.faq-answer { padding: 0 20px 23px 18px; border-left: 2px solid #cbd8cb; margin: 0 0 10px; }
.article-section .faq-answer p { font-size: 14px; line-height: 1.95; }
html[lang="en"] .faq-item summary { font-size: 15px; }
html[lang="en"] .article-section .faq-answer p { font-size: 15px; }
html[lang="en"] .article-section p, html[lang="en"] .article-section li { font-size: 16px; line-height: 1.85; }
html[lang="en"] .article-section .note p { font-size: 14px; }
html[lang="en"] .subtitle { font-family: var(--serif); font-size: clamp(26px, 3.4vw, 41px); line-height: 1.3; }
@media (min-width: 1440px) { .shell { width: 1180px; } }
@media (max-width: 1000px) {
  .shell { width: calc(100% - 64px); }
  .article-grid { grid-template-columns: 155px minmax(0, 1fr); gap: 35px; }
  h2 { font-size: 24px; }
  .terms > div { grid-template-columns: 105px 1fr; }
}
@media (max-width: 760px) {
  .shell { width: calc(100% - 40px); }
  .site-header { padding: 19px 0; }
  .wordmark { font-size: 19px; }
  .languages { font-size: 12px; gap: 0; }
  .languages a, .languages span { padding: 8px; }
  .hero { padding: 45px 0 32px; }
  .eyebrow { margin-bottom: 20px; }
  h1 { margin-bottom: 21px; }
  .hero-intro { font-size: 14px; line-height: 1.95; margin-top: 22px; }
  .hero-figure { margin-bottom: 36px; }
  .hero-figure .image-stage { padding: 0; }
  .metadata { font-size: 10px; gap: 6px 16px; }
  .article-grid { display: block; }
  .contents { position: static; padding: 0 0 33px; }
  .contents-title { margin-bottom: 10px; }
  .contents ol { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; }
  .contents a { font-size: 11px; gap: 8px; padding: 13px 0; }
  .contents-note { margin-top: 14px; }
  .article-section { padding: 28px 0 35px; }
  h2 { font-size: 23px; margin-bottom: 21px; }
  .article-section p, .article-section li { font-size: 14px; }
  .article-section .image-stage { padding: 0; }
  .article-section .image-stage.game { padding: 8px; }
  .article-section figure { margin: 26px 0; }
  .terms > div { grid-template-columns: 1fr; gap: 4px; padding: 15px 0; }
  .terms dd { font-size: 13px; }
  .code-example { padding: 20px; }
  .site-footer { display: block; padding-bottom: 30px; }
  .site-footer p { margin-bottom: 13px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  body { background: white; }
  .shell { width: 100%; }
  .contents, .languages, .skip-link, .site-footer > a { display: none; }
  .article-grid { display: block; }
  .hero { padding: 30px 0; }
  h1 { font-size: 48px; }
  .hero-figure img { max-width: 500px; }
  figure, .code-example, .terms > div { break-inside: avoid; }
  h2, h3 { break-after: avoid; }
  .article-section { padding-bottom: 20px; }
}