/* ═══════════════════════════════════════════════
   PHILOSOPHY ARCHIVE — style.css
   ═══════════════════════════════════════════════ */

:root {
  --ink:         #1a1814;
  --ink-mid:     #3d3830;
  --ink-light:   #7a7060;
  --ink-faint:   #b8ad9e;
  --paper:       #f5f0e8;
  --paper-warm:  #ede7d9;
  --paper-dark:  #e0d8c8;
  --accent:      #8b3a2a;
  --accent-mid:  #a84e3a;
  --accent-light:#c4856a;
  --rule:        #c8bfae;
  --nav-h:       56px;
  --serif-jp:    'Noto Serif JP', serif;
  --serif-en:    'Cormorant Garamond', serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-jp);
  font-weight: 300;
  line-height: 1.9;
  padding-top: var(--nav-h);
  overflow-x: hidden;
}

/* paper texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 50;
  opacity: 0.6;
}

/* ── LAYOUT ──────────────────────────────────── */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── NAVIGATION ──────────────────────────────── */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(245,240,232,0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
  z-index: 800;
}

.nav-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2.4rem;
}

.nav-link {
  font-family: var(--serif-en);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-light);
  text-decoration: none;
  transition: color 0.18s;
  position: relative;
  padding-bottom: 2px;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width 0.22s;
}

.nav-link:hover,
.nav-link.active { color: var(--ink); }

.nav-link.active::after,
.nav-link:hover::after { width: 100%; }



.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--ink-mid);
  transition: all 0.2s;
}

/* ── PAGE HEADER ─────────────────────────────── */
.page-header {
  padding: 4rem 0 2.8rem;
  border-bottom: 1px solid var(--rule);
  position: relative;
}



.page-eyebrow {
  font-family: var(--serif-en);
  font-size: 0.68rem;
  letter-spacing: 0.28em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-bottom: 0.8rem;
}

.page-title {
  font-family: var(--serif-en);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 300;
  letter-spacing: 0.06em;
  color: var(--ink);
}

/* ── SECTION RULE ────────────────────────────── */
.section-rule {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.section-rule::before {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule);
}

.section-label {
  font-family: var(--serif-en);
  font-size: 0.66rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ink-faint);
  white-space: nowrap;
}

.section-rule::after {
  content: '';
  width: 20px;
  height: 1px;
  background: var(--rule);
}

/* ── SCROLL APPEAR ───────────────────────────── */
.appear {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.appear.visible {
  opacity: 1;
  transform: none;
}

/* ── TYPOGRAPHY ──────────────────────────────── */
.body-text {
  font-size: 0.9rem;
  line-height: 2;
  color: var(--ink-mid);
  letter-spacing: 0.03em;
}

.text-link {
  font-family: var(--serif-en);
  font-size: 0.8rem;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-light);
  padding-bottom: 1px;
  transition: opacity 0.18s;
}

.text-link:hover { opacity: 0.65; }

/* ── HOME ────────────────────────────────────── */
.home-main {}

.hero {
  min-height: calc(70vh - var(--nav-h));
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}

.hero-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 5rem 2rem;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  font-family: var(--serif-en);
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 1.2rem;
}

.hero-title {
  font-family: var(--serif-jp);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 400;
  letter-spacing: 0.08em;
  line-height: 1.25;
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--ink-light);
  margin-bottom: 1.8rem;
}

.hero-author {
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  color: var(--ink-mid);
  margin-bottom: 2.4rem;
}

.hero-author--cursive {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-style: italic;
  font-weight: 300;
  font-size: 1.18rem;
  letter-spacing: 0.06em;
  color: var(--ink-mid);
}

.hero-cta {
  display: inline-block;
  font-family: var(--serif-en);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--accent);
  padding: 0.75rem 2rem;
  text-decoration: none;
  transition: background 0.2s;
}

.hero-cta:hover { background: var(--accent-mid); }


/* ── HERO PHOTO BACKGROUND ───────────────────── */
.hero-photo {
  position: absolute;
  inset: 0;
  background-image: var(--hero-img, none);
  background-size: cover;
  background-position: center 30%;
  z-index: 0;
}

.hero-photo-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    var(--paper)               0%,
    var(--paper)               38%,
    rgba(245,240,232,0.82)     55%,
    rgba(245,240,232,0.28)     78%,
    rgba(245,240,232,0.06)    100%
  );
  z-index: 1;
}

.hero-inner { position: relative; z-index: 2; }

.home-section {
  padding: 4.5rem 0;
  border-bottom: 1px solid var(--rule);
}

.home-section:last-child { border-bottom: none; }

.info-list {
  font-size: 0.82rem;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.4rem 1.2rem;
}

.info-list dt {
  font-family: var(--serif-en);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding-top: 2px;
  white-space: nowrap;
}

.info-list dd {
  color: var(--ink-mid);
  letter-spacing: 0.03em;
}

.latest-card {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1.4rem;
  padding: 2rem;
  background: var(--paper-warm);
  border-left: 2px solid var(--accent);
}

.latest-num {
  font-family: var(--serif-en);
  font-size: 2.4rem;
  font-weight: 300;
  color: var(--accent);
  opacity: 0.5;
  line-height: 1;
  padding-top: 4px;
}

.latest-date {
  font-family: var(--serif-en);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  margin-bottom: 0.5rem;
}

.latest-title {
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  line-height: 1.6;
  margin-bottom: 0.3rem;
}

.latest-title-en {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 0.82rem;
  color: var(--ink-light);
}

/* ── GLOBAL TOC ──────────────────────────────── */
.global-toc {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--rule);
}

.global-toc-title {
  font-family: var(--serif-en);
  font-size: 0.68rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 1.8rem;
}

.toc-list { list-style: none; }

.toc-item {
  display: grid;
  grid-template-columns: 3rem 1fr auto;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
  text-decoration: none;
  color: inherit;
}

.toc-item:hover { border-bottom-color: var(--rule); }
.toc-item:hover .toc-paper-title { color: var(--accent); }

.toc-num {
  font-family: var(--serif-en);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.06em;
}

.toc-paper-title {
  font-size: 0.88rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  transition: color 0.2s;
}

.toc-year {
  font-family: var(--serif-en);
  font-size: 0.72rem;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
}

/* ── PAPER ENTRIES ───────────────────────────── */
.papers-section { padding: 4rem 0; }

.paper-entry { margin-bottom: 5rem; }

.paper-header {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1rem;
  margin-bottom: 1.8rem;
  padding-bottom: 1.4rem;
  border-bottom: 1px solid var(--rule);
  align-items: start;
}

.paper-number {
  font-family: var(--serif-en);
  font-size: 2.4rem;
  font-weight: 300;
  color: var(--accent);
  opacity: 0.6;
  line-height: 1;
  padding-top: 0.2rem;
}

.paper-title-jp {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  font-weight: 500;
  letter-spacing: 0.05em;
  line-height: 1.6;
  margin-bottom: 0.4rem;
}

.paper-title-en {
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 0.88rem;
  color: var(--ink-light);
  line-height: 1.5;
  margin-bottom: 0.8rem;
}

.paper-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

.tag {
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  padding: 0.18rem 0.7rem;
  border: 1px solid var(--rule);
  color: var(--ink-light);
  font-family: var(--serif-en);
  text-transform: uppercase;
}

/* ── CHAPTER TOC ─────────────────────────────── */
.chapter-toc {
  background: var(--paper-warm);
  border-left: 2px solid var(--accent);
  padding: 1.4rem 1.6rem;
  margin-bottom: 1.8rem;
}

.chapter-toc-label {
  font-family: var(--serif-en);
  font-size: 0.64rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 1rem;
}

.chapter-list { list-style: none; }

.chapter-item {
  display: grid;
  grid-template-columns: 1.8rem 1fr;
  gap: 0.4rem;
  align-items: baseline;
  padding: 0.32rem 0;
}

.chapter-item + .chapter-item { border-top: 1px solid var(--paper-dark); }

.ch-num {
  font-family: var(--serif-en);
  font-size: 0.7rem;
  color: var(--accent-light);
}

.ch-title {
  font-size: 0.82rem;
  color: var(--ink-mid);
  letter-spacing: 0.03em;
}

.abstract-label {
  font-family: var(--serif-en);
  font-size: 0.64rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.6rem;
}

.abstract {
  font-size: 0.88rem;
  line-height: 2;
  color: var(--ink-mid);
  margin-bottom: 1.4rem;
  letter-spacing: 0.03em;
}

/* ── CONTACT ─────────────────────────────────── */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 4rem;
  padding: 4rem 0 5rem;
}

.form-group { margin-bottom: 1.4rem; }

.form-label {
  display: block;
  font-family: var(--serif-en);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-light);
  margin-bottom: 0.5rem;
}

.form-input {
  width: 100%;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--rule);
  padding: 0.55rem 0;
  font-family: var(--serif-jp);
  font-size: 0.88rem;
  font-weight: 300;
  color: var(--ink);
  outline: none;
  transition: border-color 0.2s;
  border-radius: 0;
  appearance: none;
}

.form-input:focus { border-bottom-color: var(--accent); }
.form-input::placeholder { color: var(--ink-faint); }

.form-select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23b8ad9e'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 4px center;
  padding-right: 1.5rem;
}

.form-textarea { resize: vertical; min-height: 120px; line-height: 1.8; }

.form-submit {
  font-family: var(--serif-en);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--accent);
  border: none;
  padding: 0.85rem 2.4rem;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 0.5rem;
}

.form-submit:hover { background: var(--accent-mid); }

.form-note {
  margin-top: 1rem;
  font-size: 0.74rem;
  color: var(--ink-faint);
  line-height: 1.7;
}

.form-success {
  text-align: center;
  padding: 3rem 1rem;
}

.success-icon {
  font-size: 1.8rem;
  color: var(--accent);
  margin-bottom: 0.8rem;
}

.success-title {
  font-family: var(--serif-en);
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 0.12em;
  margin-bottom: 0.6rem;
}

.success-body {
  font-size: 0.84rem;
  color: var(--ink-mid);
}

/* ── FOOTER ──────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0;
  text-align: center;
}

.footer-text {
  font-family: var(--serif-en);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
}

/* ── BACK TO TOP ─────────────────────────────── */
.back-top {
  position: fixed;
  bottom: 2rem; right: 2rem;
  width: 38px; height: 38px;
  background: var(--paper-warm);
  border: 1px solid var(--rule);
  color: var(--ink-light);
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 100;
  text-decoration: none;
}

.back-top.show { opacity: 1; }
.back-top:hover { background: var(--paper-dark); }

/* ── RESPONSIVE ──────────────────────────────── */
@media (max-width: 700px) {
  .contact-layout { grid-template-columns: 1fr; gap: 2.5rem; }
  .paper-header { grid-template-columns: 2.4rem 1fr; }
  .paper-number { font-size: 1.8rem; }
  .toc-item { grid-template-columns: 2.4rem 1fr auto; }
  .latest-card { grid-template-columns: 2.4rem 1fr; }
  .nav-links { display: none; flex-direction: column; position: absolute; top: var(--nav-h); left: 0; right: 0; background: rgba(245,240,232,0.97); padding: 1.5rem 2rem; border-bottom: 1px solid var(--rule); gap: 1.2rem; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .paper-action-row {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.9rem;
  }
}

/* ── Paper Body Styles ───────────────────────── */
.paper-body {
  margin-top: 3rem;
  border-top: 1px solid var(--rule);
  padding-top: 2.5rem;
}

.paper-section-title {
  font-family: var(--serif-jp);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink);
  margin: 3rem 0 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

.paper-subsection-title {
  font-family: var(--serif-jp);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink-mid);
  margin: 2rem 0 0.7rem;
  letter-spacing: 0.03em;
}

.paper-body .body-text {
  font-size: 0.84rem;
  line-height: 2;
  color: var(--ink-mid);
  margin-bottom: 1rem;
  text-align: justify;
}

.paper-definition,
.paper-proposition {
  font-family: var(--serif-jp);
  font-size: 0.84rem;
  line-height: 1.9;
  border-left: 3px solid var(--accent);
  padding: 1rem 1.4rem;
  margin: 1.4rem 0;
  background: rgba(80,70,55,0.04);
  color: var(--ink);
}

.paper-definition p { margin: 0.3rem 0; }

.body-text--note {
  font-size: 0.78rem;
  color: var(--ink-faint);
  padding-left: 1.4rem;
  position: relative;
}

.note-num {
  position: absolute;
  left: 0;
  font-weight: 500;
  color: var(--ink-mid);
}

.paper-references {
  list-style: none;
  padding: 0;
  margin: 0;
}

.paper-references li {
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--ink-mid);
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--rule);
  padding-left: 1.4rem;
  text-indent: -1.4rem;
}

/* ── New page components ─────────────────────── */


/* ── Language switch in nav ─────────────────── */
.nav-lang {
  border-left: 1px solid var(--rule);
  padding-left: 1.4rem;
  margin-left: 0.6rem;
  letter-spacing: 0.22em;
}


/* Status badges */
.status-badge {
  display: inline-block;
  font-family: var(--serif-en);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 0.18em 0.7em;
  border-radius: 2px;
  vertical-align: middle;
}
.status-badge--preprint {
  background: rgba(140,90,70,0.1);
  color: var(--accent);
  border: 1px solid rgba(140,90,70,0.25);
}
.status-badge--forthcoming {
  background: rgba(100,100,100,0.07);
  color: var(--ink-faint);
  border: 1px solid var(--rule);
}

/* Paper status row */
.paper-status-row {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.6rem;
}
.paper-year-badge {
  font-family: var(--serif-en);
  font-size: 0.78rem;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}

/* Paper actions */
.paper-actions {
  display: flex;
  gap: 0.8rem;
  margin: 1.4rem 0;
  flex-wrap: wrap;
}
.btn-primary {
  font-family: var(--serif-en);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--accent);
  padding: 0.6em 1.4em;
  text-decoration: none;
  transition: opacity 0.18s;
}
.btn-primary:hover { opacity: 0.82; }
.btn-secondary {
  font-family: var(--serif-en);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mid);
  background: transparent;
  border: 1px solid var(--rule);
  padding: 0.6em 1.4em;
  text-decoration: none;
  transition: border-color 0.18s, color 0.18s;
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

/* Paper action row (home) */
.paper-action-row {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  margin-top: 1.2rem;
  flex-wrap: wrap;
}

/* About page */
.about-page-layout {
  max-width: 680px;
  margin: 3rem 0 5rem;
}
.about-name-display {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-style: italic;
  font-weight: 300;
  font-size: 2rem;
  color: var(--ink);
  letter-spacing: 0.04em;
  margin-bottom: 2rem;
}
.info-list--page {
  margin-top: 1rem;
  gap: 0.6rem 1.6rem;
  align-items: baseline;
}
.info-list--page dt {
  margin-top: 0.6rem;
  padding-top: 0;
}
.info-list--page dd {
  margin-top: 0.6rem;
}


/* ── Central Question (Home) ─────────────────── */
.home-cq {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--rule);
}
.cq-text {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-style: italic;
  font-weight: 300;
  font-size: clamp(1.08rem, 2.2vw, 1.45rem);
  line-height: 1.75;
  color: var(--ink);
  max-width: 640px;
  border-left: 3px solid var(--accent);
  padding-left: 1.4rem;
}
.cq-text em {
  font-style: normal;
  color: var(--accent);
}

/* ── Paper detail page ───────────────────────── */
.page-eyebrow-link {
  color: var(--ink-faint);
  text-decoration: none;
  transition: color 0.18s;
}
.page-eyebrow-link:hover { color: var(--accent); }

.page-title--paper {
  font-size: clamp(1.2rem, 3vw, 2rem);
}
.page-title-sub {
  font-family: var(--serif-en);
  font-size: 0.88rem;
  font-style: italic;
  font-weight: 300;
  color: var(--ink-faint);
  margin-top: 0.4rem;
  letter-spacing: 0.03em;
}

/* ── Research Programme page ─────────────────── */
.research-page-layout {
  max-width: 680px;
  margin: 2rem 0 5rem;
}
.rp-section {
  margin-bottom: 3rem;
}
.rp-thesis {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-style: italic;
  font-weight: 300;
  font-size: 1.15rem;
  line-height: 1.7;
  border-left: 3px solid var(--accent);
  padding: 0.8rem 1.4rem;
  margin: 1.2rem 0;
  color: var(--ink);
  background: rgba(80,70,55,0.03);
}
.rp-parts {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 0.5rem;
}
.rp-part {
  display: flex;
  align-items: flex-start;
  gap: 1.4rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--rule);
}
.rp-part:last-child { border-bottom: none; }
.rp-part-num {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: 1.6rem;
  font-weight: 300;
  color: var(--ink-faint);
  line-height: 1;
  min-width: 1.4rem;
  padding-top: 0.2rem;
}
.rp-part--active .rp-part-num { color: var(--accent); }
.rp-part-body { flex: 1; }
.rp-part-title {
  font-family: 'Cormorant Garamond', Georgia, serif;
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 0.4rem;
  letter-spacing: 0.02em;
}
.rp-list {
  list-style: none;
  padding: 0;
  margin: 0.8rem 0 0;
}
.rp-list li {
  font-size: 0.84rem;
  color: var(--ink-mid);
  line-height: 1.8;
  padding-left: 1.2rem;
  position: relative;
}
.rp-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent);
}
.rp-keywords {
  color: var(--ink-faint);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

/* ── How to cite ─────────────────────────────── */
.how-to-cite {
  margin: 1.6rem 0;
  padding: 1rem 1.4rem;
  border: 1px solid var(--rule);
  background: rgba(80,70,55,0.03);
}
.cite-label {
  font-family: var(--serif-en);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.6rem;
}
.cite-text {
  font-family: var(--serif-en);
  font-size: 0.82rem;
  line-height: 1.8;
  color: var(--ink-mid);
}

/* ── Print / PDF ─────────────────────────────── */
@media print {
  /* ナビ・フッター・ボタン類を非表示 */
  .site-nav,
  .footer,
  .site-footer,
  .back-top,
  .paper-actions,
  .how-to-cite,
  .btn-primary,
  .btn-secondary,
  .nav-toggle { display: none !important; }

  /* ページ設定 */
  @page {
    size: A4;
    margin: 25mm 20mm 25mm 20mm;
  }

  body {
    font-size: 10.5pt;
    color: #000;
    background: #fff;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }

  /* タイトル部 */
  .page-header {
    padding: 0 0 1.5rem;
    border-bottom: 1pt solid #000;
    margin-bottom: 1.5rem;
  }

  .page-title {
    font-size: 16pt;
    color: #000;
  }

  .page-title-sub {
    font-size: 11pt;
    color: #333;
  }

  .page-eyebrow { display: none; }

  /* 論文ヘッダー */
  .paper-number { display: none; }

  .paper-title-jp {
    font-size: 14pt;
    color: #000;
    margin-bottom: 0.3rem;
  }

  .paper-title-en {
    font-size: 10pt;
    color: #333;
    margin-bottom: 0.5rem;
  }

  .paper-tags { display: none; }

  .paper-status-row { margin-bottom: 0.5rem; }

  /* アブストラクト */
  .abstract-label {
    font-size: 9pt;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-top: 1.5rem;
  }

  .abstract {
    font-size: 9.5pt;
    line-height: 1.6;
    border-left: 2pt solid #999;
    padding-left: 1rem;
    margin: 0.5rem 0 1.5rem;
  }

  /* 目次 */
  .chapter-toc {
    border: 1pt solid #ccc;
    padding: 0.8rem 1rem;
    margin-bottom: 1.5rem;
    break-inside: avoid;
  }

  .chapter-toc-label {
    font-size: 8pt;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
  }

  .chapter-item {
    font-size: 9pt;
    padding: 0.15rem 0;
  }

  /* 本文 */
  .paper-section-title {
    font-size: 12pt;
    font-weight: bold;
    margin: 2rem 0 0.8rem;
    padding-bottom: 3pt;
    border-bottom: 1pt solid #000;
    break-after: avoid;
  }

  .paper-subsection-title {
    font-size: 10.5pt;
    font-weight: bold;
    margin: 1.2rem 0 0.4rem;
    break-after: avoid;
  }

  .body-text {
    font-size: 10pt;
    line-height: 1.85;
    text-align: justify;
    margin-bottom: 0.6rem;
    orphans: 3;
    widows: 3;
  }

  /* 定義・命題ブロック */
  .paper-definition,
  .paper-proposition {
    font-size: 9.5pt;
    border-left: 3pt solid #666;
    padding: 0.6rem 1rem;
    margin: 0.8rem 0;
    background: none;
    break-inside: avoid;
  }

  /* 注 */
  .body-text--note {
    font-size: 8.5pt;
    color: #444;
  }

  /* 参考文献 */
  .paper-references li {
    font-size: 8.5pt;
    line-height: 1.6;
    border-bottom: none;
    padding: 0.2rem 0;
  }

  /* リンクのURL非表示 */
  a::after { content: none !important; }

  /* 改ページ制御 */
  .paper-section-title { page-break-before: auto; }
  .paper-definition,
  .paper-proposition,
  .chapter-toc { page-break-inside: avoid; }
}

/* ── Updates ─────────────────────────────────── */
.updates-list {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0;
}
.update-item {
  display: flex;
  gap: 2rem;
  align-items: baseline;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.84rem;
}
.update-item:last-child { border-bottom: none; }
.update-date {
  font-family: var(--serif-en);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  min-width: 5.5rem;
}
.update-text {
  color: var(--ink-mid);
  line-height: 1.5;
}

/* ── 404 ─────────────────────────────────────── */
.error-main {
  min-height: calc(100vh - var(--nav-h) - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
}
.error-inner {
  text-align: center;
}
.error-code {
  font-family: var(--serif-en);
  font-size: 6rem;
  font-weight: 300;
  color: var(--rule);
  line-height: 1;
  margin-bottom: 1rem;
}
.error-msg {
  font-family: var(--serif-en);
  font-size: 1rem;
  font-style: italic;
  color: var(--ink-faint);
  margin-bottom: 2rem;
  letter-spacing: 0.1em;
}

/* ── Preprint notice ─────────────────────────── */
.preprint-notice {
  font-family: var(--serif-en);
  font-size: 0.78rem;
  font-style: italic;
  color: var(--ink-faint);
  border-left: 2px solid var(--rule);
  padding: 0.4rem 1rem;
  margin: 1rem 0 1.4rem;
  letter-spacing: 0.02em;
}
/* --- HERO CTA FIX --- */
.hero-cta-group {
  display: flex;
  gap: 20px;
  align-items: center;
  margin-top: 1.4rem;
}

.hero-cta--secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}