:root {
  color-scheme: light;
  --bg: #fafaf9;
  --text: #242424;
  --muted: #62625f;
  --line: #deded9;
  --link: #315477;
  --max: 940px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; color: var(--text); background: var(--bg); line-height: 1.85; overflow-wrap: anywhere; }
a { color: var(--link); text-underline-offset: 4px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 2px solid var(--link); outline-offset: 4px; }
.wrap { width: min(var(--max), calc(100% - 48px)); margin-inline: auto; }
h1, h2, h3 { line-height: 1.45; font-weight: 650; }
h1 { font-size: clamp(1.85rem, 4.5vw, 2.8rem); }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.15rem; }
p { margin-top: 0; }
.muted { color: var(--muted); }
.lead { color: var(--muted); font-size: 1.07rem; max-width: 720px; }
.skip-link { position: absolute; left: 16px; top: -100px; padding: 8px 16px; background: var(--bg); z-index: 1; }
.skip-link:focus { top: 8px; }

.site-header { min-height: 80px; display: flex; justify-content: space-between; align-items: center; gap: 24px; border-bottom: 1px solid var(--line); }
.wordmark { color: var(--text); font-size: 1.1rem; font-weight: 750; text-decoration: none; letter-spacing: .04em; flex-shrink: 0; }
.site-header nav { display: flex; flex-wrap: wrap; gap: 10px 24px; }
.site-header nav a { color: var(--muted); font-size: .87rem; }
.site-header nav a[aria-current="page"] { color: var(--text); }
.preview-label { margin-top: 14px; margin-bottom: 0; color: var(--muted); font-size: .78rem; }

.intro { padding: 64px 0 72px; }
.intro h1 { margin: 0 0 12px; }
.intro p { color: var(--muted); font-size: 1.05rem; margin-bottom: 0; }
.games-list { padding-bottom: 72px; scroll-margin-top: 24px; }
.games-list h2 { margin: 0 0 18px; }
.game-rows { border-top: 1px solid var(--line); }
.game-row { display: grid; grid-template-columns: minmax(0, 1fr); align-items: start; gap: 20px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.game-number { color: var(--muted); font-size: .85rem; font-variant-numeric: tabular-nums; padding-top: 3px; }
.game-summary h3 { margin: 0 0 9px; }
.game-summary h3 a { color: var(--text); text-decoration: none; }
.game-summary h3 a:hover { text-decoration: underline; }
.game-summary p { color: var(--muted); font-size: .95rem; margin: 0; max-width: 650px; }
.row-link { font-size: .87rem; white-space: nowrap; margin-top: 4px; }
.about { padding-bottom: 72px; }
.about h2 { margin: 0 0 20px; }
.about p { color: var(--muted); margin-bottom: 10px; }

.site-footer { border-top: 1px solid var(--line); padding: 26px 0 36px; color: var(--muted); font-size: .85rem; }
.footer-row { display: flex; justify-content: space-between; align-items: baseline; gap: 18px 28px; flex-wrap: wrap; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.footer-links a { color: var(--muted); }
.game-navigation { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-bottom: 28px; }
.game-navigation span { flex-basis: 100%; color: var(--text); }
.game-navigation a { color: var(--muted); }

.game-detail { padding: 36px 0 90px; }
.breadcrumb { display: inline-block; margin-bottom: 40px; font-size: .9rem; }
.game-detail h1 { margin: 0 0 20px; }
.game-detail .lead { margin-bottom: 50px; }
.detail-columns { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(240px, 1fr); gap: 48px; border-top: 1px solid var(--line); padding-top: 30px; }
.detail-columns h2 { margin-top: 0; font-size: 1.2rem; }
.feature-list { padding-left: 1.35em; }
.feature-list li { margin-bottom: 10px; }
.detail-aside { padding-left: 28px; border-left: 1px solid var(--line); align-self: start; font-size: .95rem; }
.detail-aside hr { border: 0; border-top: 1px solid var(--line); margin: 26px 0; }
.button { display: inline-block; padding: 8px 16px; border: 1px solid var(--link); text-decoration: none; }
.button:hover { text-decoration: underline; }

.document { max-width: 780px; padding: 42px 0 80px; }
.document h1 { margin: 0 0 20px; }
.document-intro { color: var(--muted); }
.document section { border-top: 1px solid var(--line); margin-top: 36px; padding-top: 24px; }
.document section h2 { margin: 0 0 20px; font-size: 1.25rem; }
.document section h3 { margin: 26px 0 12px; font-size: 1.05rem; }
.document ul { padding-left: 1.4em; }
.document li { margin-bottom: 8px; }
.review-note { margin: 24px 0; padding: 14px 18px; border-left: 3px solid #b1aaa0; background: #f0efeb; font-size: .9rem; }
.review-note strong { display: block; margin-bottom: 6px; }
.review-note p { margin: 0; }
.document-back { margin: 40px 0 0; }

@media (max-width: 690px) {
  .wrap { width: calc(100% - 36px); }
  .site-header { padding: 20px 0; align-items: flex-start; flex-direction: column; gap: 12px; }
  .site-header nav { gap: 8px 18px; }
  .site-header nav a { font-size: .83rem; }
  .intro { padding: 46px 0 52px; }
  .game-row { grid-template-columns: minmax(0, 1fr); gap: 12px; padding: 26px 0; }
  .row-link { grid-column: 2; margin-top: 0; justify-self: start; }
  .games-list, .about { padding-bottom: 54px; }
  .footer-row, .footer-links { flex-direction: column; gap: 10px; }
  .game-navigation { flex-direction: column; gap: 10px; }
  .game-detail { padding: 30px 0 64px; }
  .breadcrumb { margin-bottom: 30px; }
  .game-detail .lead { margin-bottom: 36px; }
  .detail-columns { grid-template-columns: 1fr; gap: 30px; }
  .detail-aside { padding: 24px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .document { padding: 32px 0 60px; }
}