/* ==========================================================================
   古典の杜 (Koten no Mori) - Japanese Classical Literature Web Portal & Reader
   Design System & Styling
   ========================================================================== */

:root {
  /* Japanese Traditional Color Palette */
  --color-ai-dark: #192a3e;       /* 濃藍 (Dark Indigo) */
  --color-ai-primary: #223a5e;    /* 藍色 (Indigo) */
  --color-ai-light: #e8eef5;      /* 藍白 (Light Indigo tint) */
  --color-akane: #a83836;         /* 茜色 (Madder Red accent) */
  --color-akane-hover: #8f2c2a;
  --color-kinari: #fcf9f2;        /* 生成り (Unbleached Silk / Cream Paper) */
  --color-kinari-dark: #f0ebde;   /* 深生 (Muted Paper Border) */
  --color-sumi: #212529;          /* 墨 (Charcoal Text) */
  --color-sumi-light: #495057;    /* 薄墨 (Muted Text) */
  --color-sumi-lighter: #6c757d;
  --color-matcha: #435e46;        /* 抹茶色 (Matcha Green) */
  --color-matcha-bg: #f2f6f2;
  --color-kohaku: #c47c2b;        /* 琥珀色 (Amber Accent) */
  
  /* Reader Theme Colors */
  --reader-bg-kinari: #fbf7ee;
  --reader-text-kinari: #242424;
  --reader-border-kinari: #e3dac9;
  
  --reader-bg-dark: #1a1d20;
  --reader-text-dark: #e6e6e6;
  --reader-border-dark: #33383f;
  
  --reader-bg-white: #ffffff;
  --reader-text-white: #111827;
  --reader-border-white: #e5e7eb;

  --reader-bg-matcha: #f3f6f0;
  --reader-text-matcha: #233426;
  --reader-border-matcha: #d5e0d4;

  /* Typography */
  --font-serif: 'Noto Serif JP', 'Shippori Mincho', 'Yu Mincho', 'Hiragino Mincho ProN', serif;
  --font-sans: 'Zen Kaku Gothic New', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Hiragino Sans', sans-serif;
  --font-classic: 'Shippori Mincho', 'Noto Serif JP', serif;

  /* Shadows & Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.12);
  --shadow-modal: 0 20px 40px rgba(0, 0, 0, 0.2);

  --transition-base: all 0.2s ease-in-out;
}

/* Reset & Base Setup */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-kinari);
  color: var(--color-sumi);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.modal-open,
body.reader-open {
  overflow: hidden;
}

a {
  color: var(--color-ai-primary);
  text-decoration: none;
  transition: var(--transition-base);
}

a:hover {
  color: var(--color-akane);
}

button, select, input {
  font-family: inherit;
  font-size: inherit;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  background-color: var(--color-ai-dark);
  color: #ffffff;
  padding: 1.25rem 2rem;
  border-bottom: 3px solid var(--color-kohaku);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.header-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand-logo {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
  word-break: keep-all;
  flex-shrink: 0;
}

.brand-title-text {
  white-space: nowrap;
  word-break: keep-all;
  display: inline-block;
}

.brand-logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  background-color: var(--color-akane);
  color: #ffffff;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  font-weight: bold;
  flex-shrink: 0;
}

.brand-subtitle {
  font-size: 0.85rem;
  color: #cbd5e1;
  letter-spacing: 0.04em;
  white-space: nowrap;
  word-break: keep-all;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* ==========================================================================
   Hero & Search Section
   ========================================================================== */
.hero-section {
  background: linear-gradient(180deg, var(--color-ai-dark) 0%, var(--color-ai-primary) 100%);
  color: #ffffff;
  padding: 3rem 1.5rem 2.5rem;
  text-align: center;
  position: relative;
}

.hero-inner {
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 0.8rem;
  line-height: 1.4;
}

.hero-description {
  font-size: 1.05rem;
  color: #e2e8f0;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.search-box-wrapper {
  position: relative;
  max-width: 620px;
  margin: 0 auto;
}

.search-input-group {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 1.25rem;
  font-size: 1.2rem;
  color: var(--color-sumi-lighter);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 0.95rem 3rem 0.95rem 3.2rem;
  border-radius: var(--radius-full);
  border: 2px solid rgba(255, 255, 255, 0.2);
  background-color: #ffffff;
  color: var(--color-sumi);
  font-size: 1.05rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  transition: var(--transition-base);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-kohaku);
  box-shadow: 0 0 0 4px rgba(196, 124, 43, 0.25);
}

.search-clear-btn {
  position: absolute;
  right: 1.25rem;
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--color-sumi-lighter);
  cursor: pointer;
  display: none;
}

.search-shortcut-hint {
  display: block;
  font-size: 0.8rem;
  color: #cbd5e1;
  margin-top: 0.6rem;
}

/* ==========================================================================
   Era Timeline Navigation
   ========================================================================== */
.timeline-section {
  background-color: var(--color-kinari-dark);
  border-bottom: 1px solid #e2dac9;
  padding: 0.8rem 1rem;
  position: sticky;
  top: 73px;
  z-index: 90;
  backdrop-filter: blur(8px);
}

.timeline-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  gap: 0.6rem;
  overflow-x: auto;
  padding: 0.2rem 0;
  scrollbar-width: thin;
}

.timeline-container::-webkit-scrollbar {
  height: 4px;
}

.timeline-container::-webkit-scrollbar-thumb {
  background-color: #c9bfae;
  border-radius: 4px;
}

.timeline-item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  background-color: #ffffff;
  border: 1px solid #d9d0be;
  border-radius: var(--radius-full);
  color: var(--color-sumi);
  font-weight: 500;
  font-size: 0.92rem;
  cursor: pointer;
  transition: var(--transition-base);
  white-space: nowrap;
}

.timeline-item:hover {
  border-color: var(--color-ai-primary);
  background-color: var(--color-ai-light);
  color: var(--color-ai-primary);
}

.timeline-item.active {
  background-color: var(--color-ai-primary);
  border-color: var(--color-ai-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.timeline-item.active .timeline-era-badge {
  background-color: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

.timeline-era-badge {
  font-size: 0.78rem;
  padding: 0.15rem 0.45rem;
  background-color: #f1ede4;
  border-radius: var(--radius-full);
  color: var(--color-sumi-light);
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */
.main-content {
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  flex: 1;
}

/* Filter Controls Bar */
.filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.8rem;
  flex-wrap: wrap;
  padding-bottom: 1rem;
  border-bottom: 1px solid #e8e2d4;
}

.filter-left-group {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.filter-right-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.results-counter {
  font-weight: 600;
  color: var(--color-sumi-light);
  font-size: 0.95rem;
}

.custom-select {
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid #d5cbba;
  background-color: #ffffff;
  color: var(--color-sumi);
  font-size: 0.9rem;
  cursor: pointer;
  transition: var(--transition-base);
}

.custom-select:focus {
  outline: none;
  border-color: var(--color-ai-primary);
}

/* Works Grid */
.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.75rem;
}

/* Work Card */
.work-card {
  position: relative;
  background-color: #ffffff;
  border: 1px solid #e7decb;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  overflow: hidden;
}

.work-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #c9bfae;
}

.work-card.has-bookmark {
  border-color: #e59d93;
}

.card-bookmark-ribbon {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background-color: var(--color-akane);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 6px rgba(184, 51, 42, 0.3);
  z-index: 5;
}

.card-progress-ribbon {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background-color: #5c6b73;
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-full);
  z-index: 5;
}

.bookmark-active-badge {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  background-color: #fce8e6;
  color: var(--color-akane);
  border: 1px solid #f5c2bc;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.card-clickable-area {
  padding: 1.5rem 1.5rem 1rem;
  cursor: pointer;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.era-badge {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  color: #ffffff;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  letter-spacing: 0.03em;
}

.genre-badge {
  display: inline-block;
  padding: 0.25rem 0.65rem;
  background-color: #ece5d8;
  color: var(--color-sumi);
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.card-year {
  font-size: 0.82rem;
  color: var(--color-sumi-lighter);
}

.card-title-group {
  margin-bottom: 0.85rem;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-ai-dark);
  line-height: 1.3;
  margin-bottom: 0.2rem;
}

.card-kana {
  font-size: 0.85rem;
  color: var(--color-sumi-lighter);
}

.card-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.86rem;
  color: var(--color-sumi-light);
  margin-bottom: 0.9rem;
  flex-wrap: wrap;
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.card-oneliner {
  font-size: 0.94rem;
  color: var(--color-sumi);
  line-height: 1.55;
  margin-bottom: 1rem;
  background-color: #faf7ef;
  padding: 0.65rem 0.85rem;
  border-left: 3px solid var(--color-kohaku);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.card-quote-snippet {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  color: #4b5563;
  line-height: 1.5;
  margin-bottom: 1rem;
  padding-left: 0.8rem;
  position: relative;
  font-style: italic;
}

.card-quote-snippet .quote-mark {
  color: var(--color-akane);
  font-weight: bold;
  margin-right: 0.2rem;
}

.card-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 0.5rem;
}

.tag-pill {
  font-size: 0.75rem;
  color: var(--color-sumi-light);
  background-color: #f1ebe1;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
}

.card-footer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  padding: 1rem 1.5rem;
  background-color: #faf7ef;
  border-top: 1px solid #eee7d8;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  font-size: 0.92rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-base);
  border: 1px solid transparent;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
}

.btn-large {
  padding: 0.85rem 1.75rem;
  font-size: 1.05rem;
}

.btn-primary {
  background-color: var(--color-akane);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-akane-hover);
  color: #ffffff;
}

.btn-outline {
  background-color: #ffffff;
  border-color: #d2c8b5;
  color: var(--color-sumi);
}

.btn-outline:hover {
  border-color: var(--color-ai-primary);
  background-color: var(--color-ai-light);
  color: var(--color-ai-primary);
}

.btn-secondary {
  background-color: #e5dfd2;
  color: var(--color-sumi);
}

.btn-secondary:hover {
  background-color: #d6cfbf;
}

.btn-header {
  background-color: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.3);
}

.btn-header:hover {
  background-color: #ffffff;
  color: var(--color-ai-dark);
}

/* No Results Card */
.no-results-card {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
  background-color: #ffffff;
  border-radius: var(--radius-md);
  border: 1px dashed #d5cab7;
}

.no-results-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.no-results-card h3 {
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
  color: var(--color-ai-dark);
}

.no-results-card p {
  color: var(--color-sumi-light);
  margin-bottom: 1.5rem;
}

/* ==========================================================================
   Detail Modal Styling
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal-overlay.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
}

.modal-window {
  position: relative;
  background-color: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 780px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-modal);
  z-index: 10;
  overflow: hidden;
  border: 1px solid #e0d6c2;
}

.modal-close-btn {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  background: none;
  border: none;
  font-size: 1.8rem;
  line-height: 1;
  color: var(--color-sumi-lighter);
  cursor: pointer;
  z-index: 20;
  width: 2.2rem;
  height: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
}

.modal-close-btn:hover {
  background-color: #f1ede4;
  color: var(--color-sumi);
}

.modal-scrollable-body {
  padding: 2.5rem 2rem 2rem;
  overflow-y: auto;
}

.detail-header {
  margin-bottom: 1.5rem;
  border-bottom: 2px solid #f0e9dc;
  padding-bottom: 1.25rem;
}

.detail-badge-group {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.detail-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-ai-dark);
  line-height: 1.25;
  margin-bottom: 0.3rem;
}

.detail-reading {
  font-size: 1rem;
  color: var(--color-sumi-lighter);
}

.detail-quick-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  background-color: #faf7ef;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.75rem;
  border: 1px solid #eee7d8;
}

.info-cell {
  display: flex;
  flex-direction: column;
}

.info-label {
  font-size: 0.8rem;
  color: var(--color-sumi-lighter);
  margin-bottom: 0.2rem;
}

.info-val {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-ai-dark);
}

.detail-section {
  margin-bottom: 1.75rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ai-primary);
  margin-bottom: 0.65rem;
}

.detail-highlight-text {
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.6;
  color: var(--color-sumi);
  background-color: #fff8e8;
  border-left: 4px solid var(--color-kohaku);
  padding: 0.8rem 1rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.detail-summary-text {
  font-size: 0.98rem;
  line-height: 1.8;
  color: var(--color-sumi);
}

.detail-quote-box {
  background-color: #f7f9fc;
  border: 1px solid #e1e7f0;
  padding: 1.25rem;
  border-radius: var(--radius-md);
}

.quote-orig {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-ai-dark);
  line-height: 1.7;
  margin-bottom: 0.6rem;
}

.quote-trans {
  font-size: 0.92rem;
  color: var(--color-sumi-light);
  line-height: 1.6;
}

.tag-pill.large {
  font-size: 0.85rem;
  padding: 0.3rem 0.8rem;
}

.detail-actions {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid #eee7d8;
  flex-wrap: wrap;
}

/* ==========================================================================
   Bookmark List Modal Styling
   ========================================================================== */
.bookmark-modal-window {
  max-width: 680px;
}

.bookmark-modal-header {
  margin-bottom: 1.5rem;
  border-bottom: 2px solid #f0e9dc;
  padding-bottom: 1rem;
}

.bookmark-modal-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-ai-dark);
  margin-bottom: 0.3rem;
}

.bookmark-modal-subtitle {
  font-size: 0.9rem;
  color: var(--color-sumi-light);
}

.bookmark-group-section {
  margin-bottom: 1.5rem;
}

.bookmark-group-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-sumi);
  margin-bottom: 0.85rem;
}

.bookmark-items-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.bookmark-item-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background-color: #faf7ef;
  border: 1px solid #e7decb;
  border-left: 4px solid var(--color-akane);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.1rem;
  transition: var(--transition-base);
}

.bookmark-item-card.progress-card {
  border-left-color: #8c9ba5;
  background-color: #f8fafc;
  border-color: #e2e8f0;
}

.bookmark-item-card:hover {
  background-color: #ffffff;
  box-shadow: var(--shadow-sm);
}

.bookmark-item-info {
  flex: 1;
}

.bookmark-item-top {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.3rem;
}

.bookmark-date {
  font-size: 0.75rem;
  color: var(--color-sumi-lighter);
}

.bookmark-item-title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-ai-dark);
  margin-bottom: 0.15rem;
}

.bookmark-item-chapter {
  font-size: 0.88rem;
  color: var(--color-sumi);
}

.bookmark-item-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.no-bookmarks-card {
  text-align: center;
  padding: 3rem 1.5rem;
  background-color: #faf7ef;
  border-radius: var(--radius-md);
  border: 1px dashed #d5cab7;
}

.no-bookmarks-icon {
  font-size: 2.8rem;
  margin-bottom: 0.8rem;
}

.no-bookmarks-card h3 {
  font-size: 1.2rem;
  color: var(--color-ai-dark);
  margin-bottom: 0.4rem;
}

.no-bookmarks-card p {
  font-size: 0.9rem;
  color: var(--color-sumi-light);
  line-height: 1.6;
  max-width: 480px;
  margin: 0 auto;
}

/* ==========================================================================
   Full-Screen Reader Modal Styling
   ========================================================================== */
.reader-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  z-index: 300;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.reader-modal-overlay.hidden {
  display: none;
}

.reader-stage {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--reader-bg-kinari);
  color: var(--reader-text-kinari);
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* Theme Variations */
.reader-modal-overlay[data-theme="dark"] .reader-stage {
  background-color: var(--reader-bg-dark);
  color: var(--reader-text-dark);
}

.reader-modal-overlay[data-theme="white"] .reader-stage {
  background-color: var(--reader-bg-white);
  color: var(--reader-text-white);
}

.reader-modal-overlay[data-theme="matcha"] .reader-stage {
  background-color: var(--reader-bg-matcha);
  color: var(--reader-text-matcha);
}

/* Font Variations */
.reader-modal-overlay[data-font="serif"] .reader-content-scroll {
  font-family: var(--font-serif);
}

.reader-modal-overlay[data-font="classic"] .reader-content-scroll {
  font-family: var(--font-classic);
}

.reader-modal-overlay[data-font="gothic"] .reader-content-scroll {
  font-family: var(--font-sans);
}

/* Reader Toolbar */
.reader-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1.25rem;
  border-bottom: 1px solid var(--reader-border-kinari);
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  gap: 0.75rem;
  flex-wrap: wrap;
  z-index: 50;
  flex-shrink: 0;
}

.reader-modal-overlay[data-theme="dark"] .reader-top-bar {
  background-color: rgba(26, 29, 32, 0.92);
  border-bottom-color: var(--reader-border-dark);
}

.reader-modal-overlay[data-theme="white"] .reader-top-bar {
  border-bottom-color: var(--reader-border-white);
}

.reader-modal-overlay[data-theme="matcha"] .reader-top-bar {
  background-color: rgba(243, 246, 240, 0.92);
  border-bottom-color: var(--reader-border-matcha);
}

.reader-title-area {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  min-width: 0;
}

.reader-work-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  white-space: nowrap;
  word-break: keep-all;
  line-height: 1.2;
}

.reader-work-era {
  font-size: 0.8rem;
  opacity: 0.8;
  white-space: nowrap;
  flex-shrink: 0;
}

.reader-top-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-shrink: 0;
}

.reader-control-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* Segmented Buttons for Mode Toggle */
.segmented-control {
  display: inline-flex;
  border: 1px solid #cfc5b2;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.segment-btn {
  padding: 0.35rem 0.75rem;
  background-color: transparent;
  border: none;
  font-size: 0.85rem;
  cursor: pointer;
  color: inherit;
  transition: var(--transition-base);
}

.segment-btn.active {
  background-color: var(--color-akane);
  color: #ffffff;
  font-weight: 600;
}

.font-size-control {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background-color: rgba(0, 0, 0, 0.05);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.btn-icon-sm {
  background: none;
  border: 1px solid rgba(0, 0, 0, 0.2);
  width: 1.6rem;
  height: 1.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: inherit;
}

.reader-modal-overlay[data-theme="dark"] .btn-icon-sm {
  border-color: rgba(255, 255, 255, 0.2);
}

.reader-select {
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid #cfc5b2;
  background-color: transparent;
  color: inherit;
  font-size: 0.85rem;
}

.reader-modal-overlay[data-theme="dark"] .reader-select {
  border-color: #4a525d;
  background-color: #262a2f;
}

.btn-reader-close {
  background-color: transparent;
  border: 1px solid #cfc5b2;
  color: inherit;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
}

.btn-reader-close:hover {
  background-color: var(--color-akane);
  border-color: var(--color-akane);
  color: #ffffff;
}

/* Bookmark Button in Reader */
.btn-reader-bookmark {
  background-color: rgba(0, 0, 0, 0.05);
  border: 1px solid #cfc5b2;
  color: inherit;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: var(--transition-base);
}

.btn-reader-bookmark:hover {
  border-color: var(--color-akane);
  color: var(--color-akane);
}

.btn-reader-bookmark.is-bookmarked {
  background-color: var(--color-akane);
  border-color: var(--color-akane);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(184, 51, 42, 0.3);
  font-weight: 600;
}

.reader-modal-overlay[data-theme="dark"] .btn-reader-bookmark {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: #4a525d;
}

.reader-modal-overlay[data-theme="dark"] .btn-reader-bookmark.is-bookmarked {
  background-color: var(--color-akane);
  color: #ffffff;
}

/* Reader Toast */
.reader-toast {
  position: absolute;
  top: 4.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  background-color: rgba(33, 37, 41, 0.92);
  color: #ffffff;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  z-index: 100;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.25s ease, transform 0.25s ease;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.reader-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Reader Bottom Navigation Bar */
.reader-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.55rem 1.25rem;
  border-top: 1px solid var(--reader-border-kinari);
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  gap: 0.75rem;
  z-index: 50;
  flex-shrink: 0;
}

.reader-modal-overlay[data-theme="dark"] .reader-bottom-bar {
  background-color: rgba(26, 29, 32, 0.92);
  border-top-color: var(--reader-border-dark);
}

.reader-chapter-dropdown {
  max-width: 380px;
  font-weight: 500;
}

/* ==========================================================================
   Reader Content & Text Flow (Horizontal & Vertical)
   ========================================================================== */
.reader-content-scroll {
  flex: 1 1 0%;
  min-height: 0;
  overflow: hidden;
  position: relative;
  box-sizing: border-box;
  width: 100%;
  height: 100%;
  display: flex;
}

/* --------------------------------------------------------------------------
   Horizontal Mode (横書き)
   -------------------------------------------------------------------------- */
.reader-content-scroll.mode-horizontal {
  display: block;
  overflow-y: auto;
  overflow-x: hidden;
  writing-mode: horizontal-tb;
  -webkit-writing-mode: horizontal-tb;
  padding: 2rem 2.5rem;
}

.reader-content-scroll.mode-horizontal .reader-chapter-body {
  max-width: 960px;
  margin: 0 auto;
  width: 100%;
  display: block;
}

.mode-horizontal .reader-chapter-heading {
  margin-bottom: 2rem;
  display: block;
}

.mode-horizontal .reader-parallel-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  width: 100%;
  box-sizing: border-box;
}

.reader-text-column {
  background-color: rgba(255, 255, 255, 0.4);
  padding: 1.5rem 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-sizing: border-box;
}

.reader-modal-overlay[data-theme="dark"] .reader-text-column {
  background-color: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.08);
}

.reader-single-column {
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.4);
  padding: 1.75rem 2rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-sizing: border-box;
}

.reader-modal-overlay[data-theme="dark"] .reader-single-column {
  background-color: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.08);
}

.column-header {
  margin-bottom: 1.25rem;
}

.badge-original {
  background-color: var(--color-ai-primary);
  color: #ffffff;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-translation {
  background-color: var(--color-matcha);
  color: #ffffff;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
}

.mode-horizontal .reader-p {
  margin-bottom: 1.5rem;
  line-height: 1.85;
  text-indent: 1em;
  letter-spacing: 0.05em;
  display: block;
}

/* --------------------------------------------------------------------------
   Vertical Mode (縦書き)
   -------------------------------------------------------------------------- */
.reader-content-scroll.mode-vertical {
  display: flex;
  overflow: hidden;
  padding: 0;
  height: 100%;
  width: 100%;
}

/* Vertical Parallel 2-Deck Stage (上段：原文 ＋ 下段：現代語訳) */
.reader-parallel-stage {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
  padding: 0.75rem 1.5rem;
  gap: 6px;
}

.two-tier-deck {
  flex: 1 1 0%;
  min-height: 0;
  height: calc(50% - 4px);
  background-color: rgba(255, 255, 255, 0.45);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-sizing: border-box;
  position: relative;
}

.reader-modal-overlay[data-theme="dark"] .two-tier-deck {
  background-color: rgba(255, 255, 255, 0.03);
}

.deck-top-orig {
  border-bottom: 2px solid var(--color-ai-primary);
}

.deck-bottom-trans {
  border-top: 2px solid var(--color-matcha);
}

.deck-scroller {
  width: 100%;
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  writing-mode: vertical-rl;
  -webkit-writing-mode: vertical-rl;
  padding: 0.75rem 1.25rem;
  box-sizing: border-box;
}

.deck-scroller::-webkit-scrollbar {
  height: 6px;
}

.deck-scroller::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.18);
  border-radius: 3px;
}

/* Single Column Vertical Stage */
.single-vertical-stage {
  width: 100%;
  height: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  writing-mode: vertical-rl;
  -webkit-writing-mode: vertical-rl;
  padding: 1.5rem 2.5rem;
  box-sizing: border-box;
  background-color: rgba(255, 255, 255, 0.45);
}

.reader-modal-overlay[data-theme="dark"] .single-vertical-stage {
  background-color: rgba(255, 255, 255, 0.03);
}

.single-vertical-stage::-webkit-scrollbar {
  height: 6px;
}

.single-vertical-stage::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.18);
  border-radius: 3px;
}

.single-content-scroll {
  display: block;
  height: 100%;
}

/* Chapter Heading in Vertical Mode */
.mode-vertical .reader-chapter-heading,
.deck-scroller .reader-chapter-heading,
.single-vertical-stage .reader-chapter-heading {
  display: block;
  height: 100%;
  margin-left: 2rem;
  margin-bottom: 0;
  writing-mode: vertical-rl;
  -webkit-writing-mode: vertical-rl;
}

.chapter-number-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-akane);
  background-color: rgba(184, 51, 42, 0.08);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(184, 51, 42, 0.2);
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.mode-vertical .chapter-number-tag,
.deck-scroller .chapter-number-tag,
.single-vertical-stage .chapter-number-tag {
  margin-bottom: 0;
  margin-left: 0.5rem;
}

.chapter-title-main {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.04em;
  display: inline-block;
  vertical-align: top;
}

.mode-vertical .chapter-title-main,
.deck-scroller .chapter-title-main,
.single-vertical-stage .chapter-title-main {
  margin-left: 0.4rem;
}

.chapter-title-sub {
  font-size: 0.95rem;
  opacity: 0.82;
  font-weight: 500;
  letter-spacing: 0.03em;
  margin-top: 0.35rem;
  display: block;
}

.mode-vertical .chapter-title-sub,
.deck-scroller .chapter-title-sub,
.single-vertical-stage .chapter-title-sub {
  margin-top: 0;
  margin-left: 0.4rem;
  display: inline-block;
  vertical-align: top;
  font-size: 0.9rem;
}

/* Paragraphs in Vertical Mode */
.deck-scroller .reader-p,
.single-content-scroll .reader-p,
.mode-vertical .reader-p {
  display: block;
  height: 100%;
  margin-left: 1.5rem;
  margin-bottom: 0;
  line-height: 1.9;
  letter-spacing: 0.05em;
  text-indent: 1em;
}

.deck-scroller .reader-p:last-child,
.single-content-scroll .reader-p:last-child {
  margin-left: 0.5rem;
}

.orig-font {
  font-family: var(--font-serif);
}

.trans-font {
  color: inherit;
}

/* Chapter Sections & Multi-Chapter Flow */
.reader-chapter-section {
  display: block;
  height: 100%;
  margin-left: 2.75rem;
}

.reader-chapter-section:last-of-type {
  margin-left: 0.5rem;
}

.mode-horizontal .reader-chapter-section {
  display: block;
  height: auto;
  margin-left: 0;
  margin-bottom: 3.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px dashed rgba(0, 0, 0, 0.15);
}

.reader-modal-overlay[data-theme="dark"] .mode-horizontal .reader-chapter-section {
  border-bottom-color: rgba(255, 255, 255, 0.15);
}

.mode-horizontal .reader-chapter-section:last-child {
  border-bottom: none;
  margin-bottom: 1.5rem;
  padding-bottom: 0;
}

.chapter-end-nav {
  display: block;
  height: 100%;
  margin-left: 2rem;
  margin-right: 1rem;
}

.chapter-end-nav .btn {
  display: inline-block;
  writing-mode: horizontal-tb;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}

.btn-matcha {
  background-color: var(--color-matcha);
  color: #ffffff;
  border: 1px solid var(--color-matcha);
}

.btn-matcha:hover {
  background-color: #354b38;
}

/* --------------------------------------------------------------------------
   Tate-chū-yoko (縦中横) - Upright Digits & Numbers in Vertical Writing
   -------------------------------------------------------------------------- */
.tcy {
  -webkit-text-combine: horizontal;
  -ms-text-combine-horizontal: all;
  text-combine-upright: all;
}

.mode-vertical .tcy,
.deck-scroller .tcy,
.single-vertical-stage .tcy {
  -webkit-text-combine: horizontal;
  -ms-text-combine-horizontal: all;
  text-combine-upright: all;
  letter-spacing: 0;
  margin-top: 0.1em;
  margin-bottom: 0.1em;
}

/* Overview inside reader */
.reader-overview-body {
  max-width: 850px;
  margin: 0 auto;
  width: 100%;
}

.reader-overview-header {
  margin-bottom: 1.5rem;
}

.work-full-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin-top: 0.5rem;
}

.work-reading {
  opacity: 0.75;
}

.overview-meta-card {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.8rem;
  background-color: rgba(0, 0, 0, 0.04);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
}

.meta-row {
  display: flex;
  gap: 0.5rem;
  font-size: 0.92rem;
}

.meta-label {
  opacity: 0.7;
}

.meta-val.highlight {
  font-weight: 600;
  color: var(--color-akane);
}

.overview-content-block {
  margin-bottom: 1.5rem;
}

.overview-content-block h3 {
  font-size: 1.2rem;
  margin-bottom: 0.8rem;
  color: var(--color-ai-primary);
}

.overview-quote-card {
  background-color: rgba(0, 0, 0, 0.04);
  border-left: 4px solid var(--color-kohaku);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.overview-quote-card h4 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.quote-text {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.quote-trans {
  font-size: 0.9rem;
  opacity: 0.85;
}

.overview-start-reading {
  margin-top: 2rem;
  text-align: center;
}

/* Loading & Error States */
.reader-loading,
.reader-error {
  margin: auto;
  text-align: center;
  padding: 3rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-top-color: var(--color-akane);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1.5rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-ai-dark);
  color: #cbd5e1;
  padding: 2.5rem 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: auto;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: #ffffff;
  white-space: nowrap;
  word-break: keep-all;
}

.footer-copy {
  font-size: 0.85rem;
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 900px) {
  .hero-title {
    font-size: 1.65rem;
  }
  
  .mode-horizontal .reader-parallel-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .works-grid {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 0.5rem 0.85rem;
  }

  .header-container {
    gap: 0.4rem;
    justify-content: space-between;
  }

  .brand-group {
    gap: 0.4rem;
  }

  .brand-logo {
    font-size: 1.25rem;
    letter-spacing: 0.04em;
    gap: 0.35rem;
    white-space: nowrap;
    word-break: keep-all;
  }

  .brand-title-text {
    font-size: 1.25rem;
    white-space: nowrap;
    word-break: keep-all;
    display: inline-block;
  }

  .brand-logo-icon {
    width: 1.8rem;
    height: 1.8rem;
    font-size: 0.95rem;
  }

  .brand-subtitle {
    display: none;
  }

  .header-actions {
    gap: 0.3rem;
  }

  .btn-header {
    padding: 0.28rem 0.5rem;
    font-size: 0.74rem;
    white-space: nowrap;
  }

  .hero-section {
    padding: 0.85rem 0.9rem;
  }

  .hero-title,
  .hero-description,
  .search-shortcut-hint {
    display: none;
  }

  .search-box-wrapper {
    margin: 0 auto;
  }

  .card-title {
    font-size: 1.15rem;
    line-height: 1.35;
    word-break: keep-all;
    overflow-wrap: break-word;
  }

  .card-kana {
    font-size: 0.76rem;
    word-break: keep-all;
    overflow-wrap: break-word;
  }

  .works-grid {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  .card-footer {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  /* Reader Top Bar on Mobile */
  .reader-top-bar {
    padding: 0.4rem 0.65rem;
    gap: 0.35rem 0.5rem;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
  }

  .reader-title-area {
    order: 1;
    max-width: 55%;
    gap: 0.35rem;
  }

  .reader-work-title {
    font-size: 1.05rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .reader-work-era {
    font-size: 0.72rem;
    white-space: nowrap;
    flex-shrink: 0;
  }

  .reader-top-actions {
    order: 2;
    display: flex;
    align-items: center;
    gap: 0.3rem;
  }

  .reader-control-group {
    order: 3;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 0.3rem;
    padding: 0.15rem 0;
  }

  .reader-control-group::-webkit-scrollbar {
    display: none;
  }

  .btn-reader-bookmark {
    padding: 0.25rem 0.45rem;
    font-size: 0.75rem;
    gap: 0.15rem;
    white-space: nowrap;
  }

  .btn-reader-close {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    white-space: nowrap;
  }

  .segmented-control .segment-btn {
    padding: 0.25rem 0.45rem;
    font-size: 0.75rem;
    white-space: nowrap;
  }

  .reader-select {
    padding: 0.25rem 0.4rem;
    font-size: 0.75rem;
    white-space: nowrap;
  }

  .font-size-control {
    padding: 0.12rem 0.3rem;
    gap: 0.15rem;
  }

  .btn-icon-sm {
    width: 1.35rem;
    height: 1.35rem;
    font-size: 0.72rem;
  }

  /* Reader Content Scroll on Mobile */
  .reader-content-scroll {
    padding: 0.75rem 0.85rem;
  }

  .reader-content-scroll.mode-vertical {
    padding: 0;
  }

  .reader-parallel-stage {
    padding: 0.35rem 0.5rem;
    gap: 4px;
  }

  .deck-scroller {
    padding: 0.35rem 0.6rem;
  }

  .single-vertical-stage {
    padding: 0.6rem 1rem;
  }

  .deck-scroller .reader-chapter-heading,
  .single-vertical-stage .reader-chapter-heading {
    margin-left: 1.25rem;
  }

  .chapter-title-main {
    font-size: 1.25rem;
    line-height: 1.3;
  }

  .chapter-title-sub {
    font-size: 0.8rem;
  }

  .mode-vertical .chapter-title-sub,
  .deck-scroller .chapter-title-sub,
  .single-vertical-stage .chapter-title-sub {
    margin-left: 0.2rem;
    font-size: 0.78rem;
  }

  .deck-scroller .reader-p,
  .single-content-scroll .reader-p {
    margin-left: 1rem;
    line-height: 1.75;
    letter-spacing: 0.03em;
  }

  /* Reader Bottom Bar on Mobile */
  .reader-bottom-bar {
    padding: 0.35rem 0.65rem;
    gap: 0.35rem;
  }

  .reader-bottom-bar .btn {
    padding: 0.3rem 0.5rem;
    font-size: 0.75rem;
    white-space: nowrap;
  }

  .reader-chapter-dropdown {
    flex: 1;
    min-width: 0;
    max-width: none;
    font-size: 0.75rem;
    padding: 0.3rem 0.35rem;
    text-overflow: ellipsis;
  }

  /* Horizontal Mode on Mobile */
  .mode-horizontal .reader-parallel-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .reader-text-column {
    padding: 0.85rem 1rem;
  }
}