:root {
  color-scheme: light;
  --paper: #f4efe4;
  --paper-deep: #e9e1d2;
  --ink: #20322a;
  --muted: #667168;
  --forest: #294c3b;
  --forest-dark: #18372a;
  --coral: #d8785c;
  --green: #6f967b;
  --ochre: #c7994c;
  --blue: #6c8ca2;
  --plum: #8d7285;
  --white: #fffdf8;
  --line: rgba(32, 50, 42, 0.18);
  --shadow: 0 20px 60px rgba(49, 54, 43, 0.09);
  --sans: "Yu Gothic UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  --serif: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); line-height: 1.8; }
a { color: inherit; }
.shell { width: min(1160px, calc(100% - 48px)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 100; top: 8px; left: 8px; transform: translateY(-150%); padding: 10px 16px; background: var(--forest-dark); color: white; }
.skip-link:focus { transform: none; }

.site-header { position: relative; z-index: 10; border-bottom: 1px solid var(--line); background: rgba(244, 239, 228, 0.94); backdrop-filter: blur(16px); }
.header-inner { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; line-height: 1; }
.brand-mark { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50% 46% 52% 45%; background: var(--forest); color: var(--white); font: 700 20px/1 var(--serif); transform: rotate(-5deg); }
.brand strong, .brand em { display: block; font-style: normal; letter-spacing: 0.03em; }
.brand strong { font-size: 15px; }
.brand em { margin-top: 4px; color: var(--coral); font: 700 14px/1 var(--serif); }
.main-nav { display: flex; align-items: center; justify-content: flex-end; gap: 18px; flex-wrap: wrap; }
.main-nav a { color: var(--ink); text-decoration: none; font-size: 13px; font-weight: 700; }
.main-nav a:hover, .main-nav a:focus-visible { color: var(--coral); }

.hero { min-height: 660px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(440px, 0.9fr); gap: 70px; align-items: center; padding-block: 72px; }
.hero-copy, .research-board { min-width: 0; }
.eyebrow, .section-number, .category-marker { margin: 0 0 18px; color: var(--coral); font-size: 12px; font-weight: 800; letter-spacing: 0.16em; }
.hero h1 { margin: 0; max-width: 10ch; font: 700 clamp(44px, 6.2vw, 82px)/1.15 var(--serif); letter-spacing: -0.04em; }
.hero h1 span { color: var(--coral); text-decoration: underline; text-decoration-thickness: 0.08em; text-underline-offset: 0.14em; }
.hero-lead { margin: 28px 0 8px; font-size: 20px; font-weight: 800; }
.hero-description { max-width: 44rem; margin: 0; color: var(--muted); font-size: 15px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 32px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 10px 20px; border-radius: 999px; text-decoration: none; font-size: 14px; font-weight: 800; }
.button.primary { background: var(--forest); color: var(--white); }
.button.secondary { border: 1px solid var(--line); background: var(--white); }
.button.light { background: var(--white); color: var(--forest-dark); }

.research-board { position: relative; min-height: 510px; padding: 34px; border: 1px solid var(--line); border-radius: 30px 30px 84px 30px; background: var(--white); box-shadow: var(--shadow); transform: rotate(1deg); }
.research-board::before { content: ""; position: absolute; top: 0; left: 34px; width: 94px; height: 7px; border-radius: 0 0 8px 8px; background: var(--coral); }
.board-kicker { margin: 4px 0 28px; color: var(--coral); font-size: 10px; font-weight: 900; letter-spacing: 0.16em; }
.paper-title { padding-bottom: 26px; border-bottom: 1px solid var(--line); }
.paper-title span, .translation-step span { display: block; margin-bottom: 6px; color: var(--muted); font-size: 11px; font-weight: 800; letter-spacing: 0.08em; }
.paper-title strong { display: block; font: 700 28px/1.45 var(--serif); }
.study-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 18px 0; }
.study-facts div { min-height: 84px; padding: 14px; border-radius: 14px; background: var(--paper); }
.study-facts dt { color: var(--coral); font-size: 9px; font-weight: 900; letter-spacing: 0.12em; }
.study-facts dd { margin: 7px 0 0; font-size: 12px; font-weight: 800; }
.translation-step { margin-top: 10px; padding: 15px 18px; border-left: 4px solid var(--ochre); background: color-mix(in srgb, var(--ochre) 12%, var(--white)); }
.translation-step.action { border-left-color: var(--green); background: color-mix(in srgb, var(--green) 12%, var(--white)); }
.translation-step p { margin: 0; font-size: 13px; font-weight: 700; }
.board-note { position: absolute; right: 32px; bottom: 20px; margin: 0; color: var(--muted); font-size: 11px; }

.principle-band { background: var(--forest-dark); color: var(--white); }
.principle-grid { display: grid; grid-template-columns: 170px minmax(0, 1fr) minmax(280px, 0.7fr); gap: 40px; align-items: start; padding-block: 72px; }
.principle-grid .section-number { color: #edb99f; }
.principle-grid h2 { margin: 0; font: 700 clamp(32px, 4.2vw, 56px)/1.3 var(--serif); }
.principle-copy p { margin-top: 0; color: rgba(255,255,255,0.76); }
.text-link { display: inline-flex; gap: 10px; align-items: center; color: inherit; font-weight: 800; text-underline-offset: 5px; }

.section-block { padding-block: 88px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-bottom: 38px; }
.section-heading h2 { margin: 0; font: 700 clamp(30px, 4vw, 48px)/1.3 var(--serif); }
.section-heading > p { max-width: 420px; margin: 0; color: var(--muted); font-size: 14px; }
.topic-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; }
.topic-card { position: relative; grid-column: span 6; min-height: 310px; padding: 28px; overflow: hidden; border: 1px solid var(--line); border-radius: 26px; background: var(--white); text-decoration: none; box-shadow: 0 8px 30px rgba(49,54,43,0.04); transition: transform 180ms ease, box-shadow 180ms ease; }
.topic-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.topic-card::after { content: ""; position: absolute; right: -50px; bottom: -65px; width: 180px; height: 180px; border-radius: 46% 54% 63% 37%; background: color-mix(in srgb, var(--tone) 20%, transparent); }
.topic-marker { color: var(--tone); font-size: 12px; font-weight: 900; letter-spacing: 0.15em; }
.topic-card h3 { margin: 42px 0 14px; font: 700 27px/1.35 var(--serif); }
.topic-card p { max-width: 31rem; margin: 0; color: var(--muted); font-size: 14px; }
.topic-arrow { position: absolute; z-index: 2; right: 24px; bottom: 22px; color: var(--tone); font-size: 25px; }
.tone-coral { --tone: var(--coral); }
.tone-green { --tone: var(--green); }
.tone-ochre { --tone: var(--ochre); }
.tone-blue { --tone: var(--blue); }
.tone-plum { --tone: var(--plum); }

.evidence-section { border-top: 1px solid var(--line); }
.evidence-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.evidence-list li { display: grid; grid-template-columns: 80px 220px 1fr; gap: 24px; align-items: baseline; padding: 24px 8px; border-bottom: 1px solid var(--line); }
.evidence-list span { color: var(--coral); font-weight: 900; }
.evidence-list strong { font: 700 20px/1.4 var(--serif); }
.evidence-list p { margin: 0; color: var(--muted); }


.page-hero, .article-hero { padding-block: 74px 54px; border-bottom: 1px solid var(--line); }
.page-hero h1, .article-hero h1 { max-width: 17ch; margin: 0; font: 700 clamp(38px, 5vw, 64px)/1.25 var(--serif); }
.page-hero > p:last-child, .article-hero > p { max-width: 720px; margin: 22px 0 0; color: var(--muted); }
.category-hero { padding-block: 82px; background: color-mix(in srgb, var(--tone) 20%, var(--paper)); border-bottom: 1px solid var(--line); }
.category-hero h1 { margin: 0; font: 700 clamp(42px, 6vw, 72px)/1.2 var(--serif); }
.category-hero p:last-child { max-width: 680px; margin: 20px 0 0; }
.category-marker { color: var(--tone); }
.category-chip { display: inline-flex; margin-bottom: 20px; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; text-decoration: none; font-size: 12px; font-weight: 800; }
.article-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 24px; }
.article-meta span { padding: 4px 10px; border-radius: 999px; background: var(--white); color: var(--muted); font-size: 12px; }
.research-disclosure { display: grid; grid-template-columns: 230px 1fr; gap: 28px; margin-top: 30px; padding: 20px 24px; border: 1px solid var(--line); border-left: 5px solid var(--green); border-radius: 14px; background: var(--white); }
.research-disclosure strong { color: var(--forest); font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; }
.research-disclosure p { margin: 0; color: var(--muted); font-size: 13px; }

.prose { width: min(820px, calc(100% - 48px)); padding-block: 58px 96px; }
.prose h2 { margin: 54px 0 18px; padding-top: 24px; border-top: 1px solid var(--line); font: 700 29px/1.45 var(--serif); }
.prose h3 { margin: 38px 0 14px; font: 700 21px/1.5 var(--serif); }
.prose p, .prose li { font-size: 16px; }
.prose a { color: var(--forest); text-underline-offset: 4px; }
.prose blockquote { margin: 30px 0; padding: 18px 24px; border-left: 5px solid var(--coral); background: var(--white); font: 700 20px/1.65 var(--serif); }
.prose table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; }
.prose th, .prose td { min-width: 130px; padding: 12px 14px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.prose th { background: var(--paper-deep); }
.prose .admonition { margin: 28px 0; padding: 18px 22px; border: 1px solid var(--line); border-left: 5px solid var(--forest); border-radius: 12px; background: var(--white); }
.prose .admonition-title { margin: 0 0 6px; font-weight: 900; }
.source-panel { margin-bottom: 84px; padding: 30px; border: 1px solid var(--line); border-radius: 20px; background: var(--white); }
.source-panel h2 { margin: 0 0 18px; font: 700 25px/1.45 var(--serif); }
.source-panel ol { margin: 0; padding-left: 22px; }
.source-panel li { margin-top: 10px; overflow-wrap: anywhere; font-size: 13px; }
.source-panel a { color: var(--forest); text-underline-offset: 4px; }
.empty-state { max-width: 680px; margin: 30px auto 70px; padding: 48px; border: 1px dashed var(--line); border-radius: 24px; background: var(--white); text-align: center; }
.empty-state > span { font-size: 44px; color: var(--coral); }
.empty-state h2 { font: 700 28px/1.4 var(--serif); }
.article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.article-card { padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: var(--white); }
.article-card > p:first-child { color: var(--coral); font-size: 12px; font-weight: 800; }
.article-card h2, .article-card h3 { font: 700 20px/1.5 var(--serif); }
.article-card p:last-child { color: var(--muted); font-size: 14px; }
.related { padding-bottom: 80px; }

.site-footer { padding-block: 54px; background: var(--forest-dark); color: rgba(255,255,255,0.72); }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px 60px; }
.footer-brand { margin: 0; color: var(--white); font: 700 24px/1.3 var(--serif); }
.footer-grid nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 20px; }
.footer-grid a { color: inherit; font-size: 13px; }
.footer-note { grid-column: 1 / -1; margin: 10px 0 0; padding-top: 22px; border-top: 1px solid rgba(255,255,255,0.13); font-size: 12px; }

@media (max-width: 900px) {
  .header-inner { align-items: flex-start; flex-direction: column; padding-block: 16px; }
  .main-nav { justify-content: flex-start; }
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .research-board { width: min(520px, 100%); margin-inline: auto; }
  .principle-grid { grid-template-columns: 1fr 1fr; }
  .principle-grid > .section-number { grid-column: 1 / -1; }
  .topic-card { grid-column: span 6; }
  .article-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 620px) {
  .shell, .prose { width: calc(100% - 28px); }
  .main-nav { gap: 9px 14px; }
  .main-nav a { font-size: 12px; }
  .hero { gap: 40px; padding-block: 50px; }
  .hero h1 { font-size: 43px; }
  .hero-lead { font-size: 17px; }
  .research-board { min-height: 470px; padding: 28px 20px; border-radius: 24px 24px 58px 24px; transform: none; }
  .paper-title strong { font-size: 23px; }
  .study-facts { grid-template-columns: 1fr; gap: 7px; }
  .study-facts div { min-height: 0; }
  .board-note { right: 22px; bottom: 15px; }
  .principle-grid { grid-template-columns: 1fr; padding-block: 55px; }
  .section-block { padding-block: 64px; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 16px; }
  .topic-grid { display: block; }
  .topic-card { display: block; min-height: 260px; margin-bottom: 14px; }
  .evidence-list li { grid-template-columns: 44px 1fr; gap: 8px 12px; }
  .evidence-list li p { grid-column: 2; }
  .page-hero, .article-hero, .category-hero { padding-block: 54px 40px; }
  .page-hero h1, .article-hero h1 { font-size: 38px; }
  .prose { padding-block: 40px 70px; }
  .prose h2 { font-size: 25px; }
  .research-disclosure { grid-template-columns: 1fr; gap: 6px; }
  .article-grid, .footer-grid { grid-template-columns: 1fr; }
  .footer-grid nav { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}