:root {
  --paper: #f1ede2;
  --paper-2: #e6e0d0;
  --paper-3: #fbf9f2;
  --ink: #191710;
  --ink-soft: #423d2f;
  --ink-faint: #7a7461;
  --red: #d6382b;
  --red-deep: #a8271c;
  --blue: #264569;
  --gold: #b98a1f;
  --shadow: 7px 7px 0 var(--ink);
  --shadow-sm: 4px 4px 0 var(--ink);
  --max-width: 1160px;
  --serif: 'Shippori Mincho', 'Hiragino Mincho ProN', 'Yu Mincho', serif;
  --sans: 'Zen Kaku Gothic New', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  --dot: 'DotGothic16', 'Zen Kaku Gothic New', monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body.page-body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background-color: var(--paper);
  background-image: radial-gradient(circle at 1px 1px, rgba(25,23,16,.05) 1px, transparent 0);
  background-size: 24px 24px;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
}
body.page-body a { color: inherit; }
body.page-body img { display: block; max-width: 100%; }
body.page-body :focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 20; padding: 8px 12px; color: var(--paper) !important; background: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: none; }

.page-header { position: sticky; top: 0; z-index: 10; border-bottom: 2px solid var(--ink); background: rgba(241,237,226,.96); backdrop-filter: blur(6px); }
.page-header-inner { width: min(var(--max-width), 92vw); min-height: 72px; margin: 0 auto; display: flex; align-items: center; gap: 24px; }
.page-brand { display: inline-flex; flex: 0 0 auto; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.page-brand strong { display: block; font-family: var(--serif); font-size: 25px; letter-spacing: .06em; line-height: 1; }
.page-brand small { display: block; margin-top: 4px; color: var(--ink-soft); font-family: var(--dot); font-size: 10px; letter-spacing: .08em; line-height: 1.2; }
.page-mark { width: 42px; height: 42px; flex: 0 0 auto; color: var(--red); }
.page-nav { display: flex; align-items: stretch; gap: 3px; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.page-nav::-webkit-scrollbar { display: none; }
.page-nav a, .top-feature-link { padding: 8px 10px; color: var(--ink-soft); font-family: var(--dot); font-size: 11px; letter-spacing: .04em; text-decoration: none; white-space: nowrap; }
.page-nav a:hover, .top-feature-link:hover { color: var(--red); }
.top-feature-link { flex: 0 0 auto; margin-left: auto; border: 2px solid var(--ink); box-shadow: var(--shadow-sm); color: var(--paper) !important; background: var(--ink); }

.page-main { padding: 42px 0 90px; }
.page-container { width: min(var(--max-width), 92vw); margin: 0 auto; }
.breadcrumbs { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; color: var(--ink-faint); font-family: var(--dot); font-size: 11px; letter-spacing: .03em; }
.breadcrumbs a { color: var(--red); text-decoration: underline; text-underline-offset: 3px; }
.page-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, 390px); gap: 54px; align-items: center; padding: 42px 0 56px; border-top: 4px solid var(--ink); border-bottom: 2px solid var(--ink); }
.page-hero-copy { min-width: 0; }
.eyebrow, .section-kicker, .prose-label, .side-label, .related-kicker, .card-category, .card-number { margin: 0; color: var(--red); font-family: var(--dot); font-size: 11px; letter-spacing: .14em; }
.page-hero h1, .collection-hero h1, .error-page h1 { max-width: 19ch; margin: 14px 0 22px; font-family: var(--serif); font-size: clamp(2.1rem, 5vw, 4rem); font-weight: 800; line-height: 1.25; letter-spacing: .02em; }
.page-intro { max-width: 62ch; margin: 0; color: var(--ink-soft); font-size: 1.05rem; line-height: 2; }
.page-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 24px; color: var(--ink-faint); font-family: var(--dot); font-size: 11px; letter-spacing: .03em; }
.page-meta span + span { padding-left: 18px; border-left: 1px solid var(--ink-faint); }
.page-hero-figure { margin: 0; }
.page-hero-figure img { width: 100%; aspect-ratio: 1; object-fit: cover; border: 2px solid var(--ink); background: var(--paper-3); box-shadow: var(--shadow); }
.page-hero-figure figcaption { margin-top: 12px; color: var(--ink-faint); font-family: var(--dot); font-size: 10px; letter-spacing: .04em; }

.reading-layout { display: grid; grid-template-columns: minmax(0, 1fr) 225px; gap: 62px; align-items: start; padding-top: 56px; }
.prose { min-width: 0; }
.prose-label { display: inline-block; margin-bottom: 18px; padding: 5px 9px; border: 1px solid var(--red); }
.prose h2, .collection-section h2, .references h2, .related h2 { margin: 46px 0 16px; font-family: var(--serif); font-size: clamp(1.45rem, 3vw, 2.25rem); font-weight: 800; line-height: 1.35; }
.prose h2:first-of-type { margin-top: 12px; }
.prose h3 { margin: 0 0 5px; font-family: var(--serif); font-size: 1.15rem; line-height: 1.4; }
.prose p { max-width: 70ch; margin: 0 0 20px; color: var(--ink-soft); line-height: 2; }
.side-note { position: sticky; top: 105px; padding: 20px; border: 2px solid var(--ink); background: var(--paper-3); box-shadow: var(--shadow-sm); }
.side-note p:not(.side-label) { margin: 12px 0 18px; color: var(--ink-soft); font-family: var(--serif); font-size: 1.05rem; line-height: 1.7; }
.side-note a { display: block; padding: 10px 0; border-top: 1px solid rgba(25,23,16,.22); color: var(--red); font-family: var(--dot); font-size: 11px; text-decoration: none; }
.side-note a:hover { color: var(--blue); }

.table-wrap { margin: 26px 0 30px; overflow-x: auto; border: 2px solid var(--ink); background: var(--paper-3); box-shadow: var(--shadow-sm); }
.prose table { width: 100%; min-width: 590px; border-collapse: collapse; font-size: .9rem; line-height: 1.7; }
.prose th, .prose td { padding: 13px 14px; border-right: 1px solid rgba(25,23,16,.18); border-bottom: 1px solid rgba(25,23,16,.18); text-align: left; vertical-align: top; }
.prose th:last-child, .prose td:last-child { border-right: 0; }
.prose tr:last-child td { border-bottom: 0; }
.prose th { width: 22%; color: var(--paper); background: var(--ink); font-family: var(--dot); font-size: .78rem; font-weight: 400; letter-spacing: .04em; }
.prose tr:nth-child(even) td { background: rgba(230,224,208,.38); }
.checklist { display: grid; gap: 10px; margin: 22px 0 30px; padding: 0; list-style: none; }
.checklist li { position: relative; padding: 14px 16px 14px 46px; border: 1px solid rgba(25,23,16,.35); background: var(--paper-3); color: var(--ink-soft); }
.checklist li::before { content: '✓'; position: absolute; top: 12px; left: 15px; color: var(--red); font-family: var(--dot); font-size: 1.05rem; }
.steps { display: grid; gap: 0; margin: 22px 0 30px; padding: 0; list-style: none; counter-reset: step; }
.steps li { display: grid; grid-template-columns: 54px 1fr; gap: 18px; padding: 20px 0; border-top: 2px solid var(--ink); }
.steps li:last-child { border-bottom: 2px solid var(--ink); }
.step-no { color: var(--red); font-family: var(--dot); font-size: 1.6rem; line-height: 1; }
.steps p { margin-bottom: 0; }
.callout { margin: 30px 0; padding: 24px 26px; border: 2px solid var(--ink); background: var(--ink); color: var(--paper); box-shadow: var(--shadow); }
.callout .callout-label { margin-bottom: 8px; color: var(--red); font-family: var(--dot); font-size: 11px; letter-spacing: .12em; }
.callout p { margin-bottom: 0; color: var(--paper-2); }

.references, .related { margin-top: 62px; padding-top: 8px; border-top: 3px solid var(--ink); }
.references ol { margin: 0; padding-left: 22px; }
.references li { padding: 13px 0 13px 6px; border-bottom: 1px solid rgba(25,23,16,.18); color: var(--ink-soft); }
.references li a { color: var(--red); font-family: var(--serif); font-weight: 700; text-decoration: underline; text-underline-offset: 3px; }
.reference-meta, .reference-use { display: block; color: var(--ink-faint); font-family: var(--dot); font-size: 10px; line-height: 1.7; }
.reference-use { margin-top: 4px; color: var(--ink-soft); font-family: var(--sans); font-size: .85rem; }
.reference-note { margin-top: 16px; color: var(--ink-faint) !important; font-size: .85rem !important; }
.reference-note a { color: var(--red); }
.related-grid, .guide-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.related-card, .guide-card { position: relative; display: flex; flex-direction: column; gap: 8px; min-height: 155px; padding: 18px; border: 2px solid var(--ink); background: var(--paper-3); box-shadow: var(--shadow-sm); text-decoration: none; }
.related-card:hover, .guide-card:hover, .article-card:hover { transform: translate(-2px, -2px); box-shadow: 7px 7px 0 var(--red); }
.related-card strong, .guide-card strong { font-family: var(--serif); font-size: 1.05rem; line-height: 1.45; }
.related-card > span:last-child, .guide-card p { margin: 0; color: var(--ink-soft); font-size: .86rem; line-height: 1.7; }

.collection-hero { display: grid; grid-template-columns: 1fr 180px; gap: 30px; align-items: end; padding: 52px 0 60px; border-top: 4px solid var(--ink); border-bottom: 2px solid var(--ink); }
.collection-hero h1 { max-width: 18ch; margin-bottom: 18px; }
.collection-mark { color: var(--red); font-family: var(--dot); font-size: 6rem; font-weight: 400; line-height: .78; text-align: right; }
.collection-mark span { display: inline-block; color: var(--ink-faint); font-size: 11px; line-height: 1.2; letter-spacing: .1em; text-align: right; }
.collection-section { padding-top: 60px; }
.section-heading { display: grid; grid-template-columns: 1fr minmax(250px, 400px); gap: 30px; align-items: end; margin-bottom: 26px; }
.section-heading h2 { margin: 8px 0 0; }
.section-heading > p { margin: 0; color: var(--ink-soft); font-size: .92rem; }
.article-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.article-card { position: relative; display: flex; flex-direction: column; min-height: 282px; padding: 24px 24px 22px; border: 2px solid var(--ink); background: var(--paper-3); box-shadow: var(--shadow); text-decoration: none; transition: transform .18s, box-shadow .18s; }
.article-card .card-number { color: var(--blue); }
.article-card .card-category { margin-top: 14px; color: var(--ink-faint); font-size: 10px; }
.article-card h3 { margin: 12px 0 10px; font-family: var(--serif); font-size: 1.42rem; line-height: 1.45; }
.article-card p { margin: 0; color: var(--ink-soft); font-size: .9rem; line-height: 1.8; }
.card-arrow { margin-top: auto; padding-top: 16px; color: var(--red); font-family: var(--dot); font-size: 1.2rem; }
.support-section { margin-top: 30px; padding-bottom: 30px; }
.guide-card { min-height: 180px; }
.guide-card > span { color: var(--red); font-family: var(--dot); font-size: 10px; letter-spacing: .1em; }
.guide-card b { margin-top: auto; color: var(--red); font-family: var(--dot); font-size: 1.3rem; font-weight: 400; }

.error-page { min-height: 58vh; display: grid; align-items: center; }
.error-page h1 { max-width: 20ch; }
.error-page .page-intro { margin-bottom: 28px; }
.error-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.button { display: inline-flex; align-items: center; padding: 12px 18px; border: 2px solid var(--ink); box-shadow: var(--shadow-sm); font-family: var(--dot); font-size: 12px; text-decoration: none; }
.button-dark { color: var(--paper) !important; background: var(--ink); }
.button-light { background: var(--paper-3); }

.page-footer { padding: 54px 0 0; color: var(--paper); background: var(--ink); }
.footer-inner { display: grid; grid-template-columns: 1fr 1fr 1.2fr; gap: 38px; width: min(var(--max-width), 92vw); margin: 0 auto; }
.footer-brand { color: var(--paper); font-family: var(--serif); font-size: 2rem; font-weight: 800; letter-spacing: .08em; }
.footer-inner p { max-width: 32ch; margin: 10px 0 0; color: var(--paper-2); font-size: .85rem; line-height: 1.8; }
.footer-inner nav { display: flex; flex-direction: column; gap: 7px; }
.footer-inner nav a, .feed-link { width: fit-content; color: var(--paper-2); font-family: var(--dot); font-size: 11px; text-decoration: none; }
.footer-inner nav a:hover, .feed-link:hover { color: var(--red); }
.footer-note { max-width: 42ch !important; color: var(--paper-2) !important; }
.feed-link { display: inline-block; margin-top: 14px; color: var(--red); }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; width: min(var(--max-width), 92vw); margin: 46px auto 0; padding: 18px 0 24px; border-top: 1px solid rgba(241,237,226,.22); color: var(--ink-faint); font-family: var(--dot); font-size: 10px; }

@media (max-width: 900px) {
  .page-header-inner { gap: 12px; }
  .page-nav { order: 3; flex-basis: 100%; padding-bottom: 8px; }
  .page-header-inner { flex-wrap: wrap; padding-top: 9px; }
  .top-feature-link { margin-left: auto; }
  .page-hero { grid-template-columns: 1fr; gap: 30px; }
  .page-hero-figure { width: min(390px, 80vw); }
  .reading-layout { grid-template-columns: 1fr; gap: 32px; }
  .side-note { position: static; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-inner > :last-child { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  body.page-body { font-size: 15px; }
  .page-main { padding-top: 28px; }
  .page-hero { padding: 34px 0 40px; }
  .page-hero h1, .collection-hero h1, .error-page h1 { font-size: clamp(1.9rem, 9vw, 3rem); }
  .page-meta { gap: 7px 12px; }
  .page-meta span + span { padding-left: 12px; }
  .collection-hero { grid-template-columns: 1fr; padding: 38px 0 42px; }
  .collection-mark { display: none; }
  .section-heading { grid-template-columns: 1fr; gap: 8px; }
  .article-grid, .related-grid, .guide-grid { grid-template-columns: 1fr; }
  .article-card { min-height: 0; }
  .prose h2, .collection-section h2, .references h2, .related h2 { margin-top: 38px; }
  .steps li { grid-template-columns: 42px 1fr; gap: 12px; }
  .callout { padding: 20px; box-shadow: var(--shadow-sm); }
  .footer-inner { grid-template-columns: 1fr; gap: 25px; }
  .footer-inner > :last-child { grid-column: auto; }
  .footer-bottom { flex-direction: column; gap: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .article-card, .related-card, .guide-card { transition: none; }
}