/* =========================================================
   《中华歇后语·俗语大全》 Core Stylesheet
   Design Philosophy: Traditional Chinese Xuan Paper & Ink Wash
   ========================================================= */

:root {
  /* Color Palette - Day (Xuan Paper & Chinese Ink) */
  --paper-bg: #f6f1e8;
  --paper-card: #fdfbf7;
  --paper-card-hover: #ffffff;
  --paper-card-subtle: #f0eae0;
  --paper-border: #e4dac9;
  --paper-border-dark: #cdbfa8;
  
  --ink-primary: #181d20;
  --ink-secondary: #3b444b;
  --ink-muted: #6e7880;
  --ink-faint: #9ea7b0;
  --ink-wash: rgba(24, 29, 32, 0.04);
  
  --cinnabar: #b83b26;
  --cinnabar-hover: #962816;
  --cinnabar-bg: #faedea;
  --cinnabar-border: #f0c3bc;
  
  --ochre: #b57a22;
  --ochre-bg: #fbf3e4;
  --jade: #2b614b;
  --jade-bg: #eaf3ee;
  
  --shadow-sm: 0 2px 8px rgba(30, 25, 20, 0.05);
  --shadow-md: 0 8px 24px rgba(30, 25, 20, 0.08);
  --shadow-lg: 0 16px 40px rgba(30, 25, 20, 0.12);
  --shadow-focus: 0 0 0 3px rgba(184, 59, 38, 0.18);
  
  --font-serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --font-kai: "Kaiti SC", "STKaiti", "KaiTi", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  --transition-fast: 0.18s ease;
  --transition-smooth: 0.32s cubic-bezier(0.2, 0.8, 0.2, 1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

/* Night / Ink Rubbing Mode */
body.theme-night {
  --paper-bg: #14171a;
  --paper-card: #1c2126;
  --paper-card-hover: #242a30;
  --paper-card-subtle: #20262c;
  --paper-border: #2d353d;
  --paper-border-dark: #3a4550;
  
  --ink-primary: #f2f5f8;
  --ink-secondary: #c9d2db;
  --ink-muted: #8895a1;
  --ink-faint: #596570;
  --ink-wash: rgba(255, 255, 255, 0.04);
  
  --cinnabar: #d94f38;
  --cinnabar-hover: #eb614a;
  --cinnabar-bg: #381a16;
  --cinnabar-border: #5e261e;
  
  --ochre: #d49332;
  --ochre-bg: #2d2212;
  --jade: #3d8b68;
  --jade-bg: #13281f;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
  --shadow-focus: 0 0 0 3px rgba(217, 79, 56, 0.3);
}

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

html, body {
  min-height: 100vh;
  background-color: var(--paper-bg);
  color: var(--ink-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

/* Subtle Xuan Paper Texture Background */
.paper-texture {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Top App Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper-bg);
  border-bottom: 1px solid var(--paper-border);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(8px);
}

.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* Brand Section */
.brand-section {
  display: flex;
  align-items: center;
  gap: 14px;
}

.bookshelf-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--paper-card-subtle);
  border: 1px solid var(--paper-border);
  color: var(--ink-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.bookshelf-back:hover {
  background: var(--paper-card);
  color: var(--cinnabar);
  border-color: var(--cinnabar-border);
}

.brand-seal {
  width: 38px;
  height: 38px;
  border-radius: 6px;
  background: var(--cinnabar);
  color: #ffffff;
  display: grid;
  place-items: center;
  font-family: var(--font-kai);
  font-size: 1.35rem;
  font-weight: 700;
  box-shadow: 0 2px 6px rgba(184, 59, 38, 0.3);
}

.brand-titles h1 {
  font-family: var(--font-serif);
  font-size: 1.28rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--ink-muted);
  letter-spacing: 0.08em;
}

/* Search Section */
.search-section {
  position: relative;
  flex: 1;
  max-width: 520px;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--paper-card);
  border: 1px solid var(--paper-border-dark);
  border-radius: 999px;
  padding: 6px 14px;
  gap: 8px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.04);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box:focus-within {
  border-color: var(--cinnabar);
  box-shadow: var(--shadow-focus);
}

.search-input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--ink-primary);
  font-size: 0.9rem;
  outline: none;
}

.search-input::placeholder {
  color: var(--ink-faint);
  font-size: 0.85rem;
}

.clear-search-btn {
  background: transparent;
  border: none;
  color: var(--ink-muted);
  cursor: pointer;
  padding: 2px 6px;
  font-size: 0.85rem;
  border-radius: 50%;
  visibility: hidden;
}

.clear-search-btn.is-visible {
  visibility: visible;
}

.clear-search-btn:hover {
  color: var(--cinnabar);
}

.search-shortcut {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--ink-muted);
  background: var(--paper-card-subtle);
  border: 1px solid var(--paper-border);
  padding: 1px 6px;
  border-radius: 4px;
}

/* Live Search Panel */
.search-results-panel {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--paper-card);
  border: 1px solid var(--paper-border-dark);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-height: 480px;
  overflow-y: auto;
  z-index: 200;
}

.search-results-header {
  padding: 10px 16px;
  background: var(--paper-card-subtle);
  border-bottom: 1px solid var(--paper-border);
  display: flex;
  justify-content: space-between;
  font-size: 0.76rem;
  color: var(--ink-muted);
}

.search-result-item {
  padding: 12px 16px;
  border-bottom: 1px solid var(--paper-border);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.search-result-item:hover, .search-result-item.selected {
  background: var(--cinnabar-bg);
}

.search-result-item .res-phrase {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  color: var(--ink-primary);
  font-weight: 600;
  margin-bottom: 4px;
}

.search-result-item .res-phrase mark {
  background: #ffe58f;
  color: #111;
  padding: 1px 3px;
  border-radius: 2px;
}

.search-result-item .res-desc {
  font-size: 0.8rem;
  color: var(--ink-muted);
  line-height: 1.4;
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--paper-card);
  border: 1px solid var(--paper-border-dark);
  color: var(--ink-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.action-btn:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
  transform: translateY(-1px);
}

.action-btn[aria-pressed="false"],
.action-btn.is-muted {
  opacity: 0.55;
}

.mode-btn {
  background: var(--cinnabar-bg);
  border-color: var(--cinnabar-border);
  color: var(--cinnabar);
}

.mode-btn:hover {
  background: var(--cinnabar);
  color: #ffffff;
}

/* Category Filter Bar */
.category-filter-bar {
  max-width: 1440px;
  margin: 0 auto;
  padding: 8px 28px 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  overflow-x: auto;
}

.filter-label {
  font-size: 0.78rem;
  color: var(--ink-muted);
  font-weight: 600;
  white-space: nowrap;
}

.category-chips-scroll {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.category-chips-scroll::-webkit-scrollbar {
  display: none;
}

.category-chip {
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--paper-card-subtle);
  border: 1px solid var(--paper-border);
  color: var(--ink-secondary);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.category-chip:hover {
  border-color: var(--cinnabar-border);
  color: var(--cinnabar);
}

.category-chip.active {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 2px 6px rgba(184, 59, 38, 0.25);
}

/* Main Reader Stage */
.reader-stage {
  max-width: 1440px;
  margin: 28px auto 90px;
  padding: 0 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(360px, 0.95fr);
  gap: 32px;
  align-items: start;
}

/* Left Card Column */
.card-column {
  width: 100%;
}

.xiehouyu-card {
  background: var(--paper-card);
  border: 1px solid var(--paper-border);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.xiehouyu-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--cinnabar), var(--ochre));
}

/* Meta Top Row */
.card-top-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 16px;
  flex-wrap: wrap;
}

.badge-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.category-badge {
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--cinnabar-bg);
  border: 1px solid var(--cinnabar-border);
  color: var(--cinnabar);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.index-badge {
  font-size: 0.8rem;
  color: var(--ink-muted);
  font-family: var(--font-serif);
}

.tags-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tag-pill {
  font-size: 0.72rem;
  color: var(--ink-muted);
  background: var(--paper-card-subtle);
  border: 1px solid var(--paper-border);
  padding: 2px 8px;
  border-radius: 4px;
}

/* Core Phrase Box */
.phrase-display-box {
  background: var(--paper-card-subtle);
  border: 1px solid var(--paper-border-dark);
  border-radius: var(--radius-md);
  padding: 30px;
  margin-bottom: 26px;
  box-shadow: inset 0 1px 4px rgba(0, 0, 0, 0.03);
}

.phrase-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  color: var(--ink-muted);
  font-weight: 600;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.label-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-muted);
}

.label-dot.accent {
  background: var(--cinnabar);
}

/* Ruby Typography & Font Scaling */
ruby {
  ruby-position: over;
  ruby-align: center;
  margin: 0 0.04em;
}

rt {
  font-family: "Avenir Next Rounded", "Nunito", sans-serif;
  font-size: 0.42em;
  font-weight: 600;
  color: var(--cinnabar);
  line-height: 1;
}

body.theme-night rt {
  color: #ff8566;
}

body:not(.pinyin-enabled) rt {
  display: none;
}

.riddle-text {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.8vw, 2.9rem);
  font-weight: 600;
  color: var(--ink-primary);
  line-height: 1.35;
  letter-spacing: 0.02em;
}

.phrase-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 20px 0;
}

.divider-line {
  flex: 1;
  height: 1px;
  background: var(--paper-border-dark);
}

.divider-symbol {
  font-family: var(--font-serif);
  color: var(--ink-muted);
  font-size: 1.1rem;
}

/* Punchline & Reveal Mechanism */
.answer-container {
  position: relative;
  min-height: 70px;
}

.reveal-button {
  width: 100%;
  padding: 20px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--cinnabar-bg), var(--paper-card));
  border: 2px dashed var(--cinnabar);
  color: var(--cinnabar);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.reveal-button:hover {
  background: var(--cinnabar);
  color: #ffffff;
  border-style: solid;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(184, 59, 38, 0.25);
}

.reveal-button .reveal-icon {
  font-size: 1.4rem;
}

.reveal-button .reveal-prompt {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: var(--font-serif);
  letter-spacing: 0.06em;
}

.reveal-button .reveal-hint {
  font-size: 0.78rem;
  opacity: 0.8;
}

/* Revealed Answer Content */
.answer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  animation: answerArrive 0.45s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

@keyframes answerArrive {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to { opacity: 1; transform: none; }
}

.answer-text {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3.5vw, 2.7rem);
  font-weight: 700;
  color: var(--cinnabar);
  line-height: 1.35;
  letter-spacing: 0.02em;
}

.seal-stamp {
  width: 60px;
  height: 60px;
  border-radius: 8px;
  border: 2px solid var(--cinnabar);
  color: var(--cinnabar);
  display: grid;
  place-items: center;
  font-family: var(--font-kai);
  font-size: 1.4rem;
  font-weight: 700;
  transform: rotate(-12deg);
  opacity: 0.9;
  user-select: none;
  box-shadow: inset 0 0 0 1px var(--cinnabar);
}

/* Riddle Mode State Control */
body.riddle-mode .answer-content {
  display: none;
}

body.riddle-mode .answer-container.is-revealed .reveal-button {
  display: none;
}

body.riddle-mode .answer-container.is-revealed .answer-content {
  display: flex;
}

/* Reader Mode (No riddle reveal required) */
body:not(.riddle-mode) .reveal-button {
  display: none;
}

body:not(.riddle-mode) .answer-content {
  display: flex;
}

/* Homophone Box */
.homophone-box {
  background: var(--ochre-bg);
  border: 1px solid rgba(181, 122, 34, 0.3);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.homophone-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ochre);
  padding: 2px 8px;
  background: rgba(181, 122, 34, 0.15);
  border-radius: 4px;
}

.homophone-detail {
  font-size: 0.9rem;
  color: var(--ink-secondary);
  font-weight: 600;
}

/* Explanation Cards */
.explanation-accordion {
  display: grid;
  gap: 16px;
  margin-bottom: 30px;
}

.exp-card {
  background: var(--paper-card-subtle);
  border: 1px solid var(--paper-border);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  transition: all var(--transition-fast);
}

.exp-card:hover {
  background: var(--paper-card);
  border-color: var(--paper-border-dark);
}

.exp-card.highlight-card {
  background: var(--jade-bg);
  border-color: rgba(43, 97, 75, 0.25);
}

.exp-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.exp-icon {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  background: var(--ink-muted);
  color: #ffffff;
  font-family: var(--font-kai);
  font-size: 0.85rem;
  font-weight: 700;
  display: grid;
  place-items: center;
}

.exp-icon.seal-red { background: var(--cinnabar); }
.exp-icon.seal-gold { background: var(--ochre); }
.exp-icon.seal-green { background: var(--jade); }

.exp-card-header h4 {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--ink-secondary);
}

.exp-body-text {
  font-size: 0.93rem;
  color: var(--ink-secondary);
  line-height: 1.7;
}

.example-text {
  font-family: var(--font-kai);
  font-size: 1.02rem;
  color: var(--jade);
  font-weight: 600;
}

body.theme-night .example-text {
  color: #72c79c;
}

/* Card Footer Pager */
.card-footer-pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid var(--paper-border);
  gap: 16px;
}

.pager-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--paper-card-subtle);
  border: 1px solid var(--paper-border-dark);
  color: var(--ink-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pager-btn:hover {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: #ffffff;
  transform: translateY(-1px);
}

.counter-display {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: var(--ink-muted);
  font-weight: 600;
}

/* Right Artwork Column */
.artwork-column {
  width: 100%;
}

.artwork-card {
  position: sticky;
  top: 100px;
  display: grid;
  gap: 20px;
}

.artwork-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 8px solid var(--paper-card);
  box-shadow: var(--shadow-lg);
  background: #152b3b;
}

.artwork-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s var(--transition-smooth), filter 0.4s ease;
}

.artwork-frame:hover .artwork-img {
  transform: scale(1.03);
}

.artwork-loading {
  position: absolute;
  inset: 0;
  background: rgba(21, 43, 59, 0.8);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: #ffffff;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 5;
}

.artwork-loading.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.artwork-loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.artwork-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px 24px;
  background: linear-gradient(180deg, transparent 0%, rgba(10, 18, 24, 0.88) 100%);
  color: #ffffff;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  pointer-events: none;
}

.artwork-badge {
  font-size: 0.72rem;
  font-weight: 700;
  background: rgba(184, 59, 38, 0.85);
  padding: 3px 8px;
  border-radius: 4px;
  letter-spacing: 0.06em;
}

.artwork-caption {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  color: #f7f1e7;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}

/* Artwork Tools */
.artwork-tools {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: var(--paper-card);
  border: 1px solid var(--paper-border);
  color: var(--ink-secondary);
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.tool-btn:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
  background: var(--cinnabar-bg);
}

/* Cultural Quote Card */
.cultural-quote-card {
  background: var(--paper-card);
  border: 1px solid var(--paper-border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
}

.quote-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}

.quote-seal {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: var(--ochre);
  color: #fff;
  font-family: var(--font-kai);
  font-size: 0.82rem;
  display: grid;
  place-items: center;
}

.quote-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-secondary);
}

.quote-body {
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.65;
}

/* Keyboard Helper Bar */
.keyboard-nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--paper-card);
  border-top: 1px solid var(--paper-border);
  padding: 8px 16px;
  z-index: 90;
  display: flex;
  justify-content: center;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.nav-hint-group {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.76rem;
  color: var(--ink-muted);
}

.hint-item kbd {
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--paper-card-subtle);
  border: 1px solid var(--paper-border-dark);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--ink-secondary);
}

.hint-divider {
  opacity: 0.5;
}

/* Full Catalog Drawer Modal */
.catalog-drawer {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  justify-content: flex-end;
}

.catalog-drawer[hidden] {
  display: none;
}

.drawer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(18, 24, 28, 0.55);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.25s ease;
}

.drawer-content {
  position: relative;
  z-index: 1;
  width: min(880px, 92vw);
  height: 100%;
  background: var(--paper-bg);
  border-left: 1px solid var(--paper-border);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  animation: slideLeft 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes slideLeft {
  from { transform: translateX(100%); }
  to { transform: none; }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.drawer-header {
  padding: 20px 28px;
  background: var(--paper-card);
  border-bottom: 1px solid var(--paper-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-title-group h2 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.drawer-subtitle {
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.close-drawer-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--paper-border);
  background: var(--paper-card-subtle);
  color: var(--ink-secondary);
  font-size: 1rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: all var(--transition-fast);
}

.close-drawer-btn:hover {
  background: var(--cinnabar);
  color: #fff;
  border-color: var(--cinnabar);
}

.drawer-filter-bar {
  padding: 14px 28px;
  background: var(--paper-card-subtle);
  border-bottom: 1px solid var(--paper-border);
  display: grid;
  gap: 12px;
}

.drawer-search-input {
  width: 100%;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--paper-card);
  border: 1px solid var(--paper-border-dark);
  font-size: 0.88rem;
  color: var(--ink-primary);
  outline: none;
}

.drawer-filter-pills {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.drawer-filter-pills::-webkit-scrollbar {
  display: none;
}

.drawer-pill {
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--paper-card);
  border: 1px solid var(--paper-border);
  color: var(--ink-secondary);
  font-size: 0.76rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.drawer-pill:hover {
  border-color: var(--cinnabar);
  color: var(--cinnabar);
}

.drawer-pill.active {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: #ffffff;
}

/* Catalog Grid Inside Drawer */
.catalog-grid {
  flex: 1;
  overflow-y: auto;
  padding: 20px 28px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}

.catalog-card {
  background: var(--paper-card);
  border: 1px solid var(--paper-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.catalog-card:hover {
  border-color: var(--cinnabar);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.catalog-card.active {
  background: var(--cinnabar-bg);
  border-color: var(--cinnabar);
}

.catalog-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.catalog-card-index {
  font-size: 0.72rem;
  color: var(--ink-muted);
  font-family: var(--font-serif);
}

.catalog-card-cat {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--cinnabar);
  padding: 1px 6px;
  background: rgba(184, 59, 38, 0.1);
  border-radius: 3px;
}

.catalog-card-riddle {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin-bottom: 4px;
}

.catalog-card-answer {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  color: var(--cinnabar);
  font-weight: 600;
}

/* Toast Message */
.toast-message {
  position: fixed;
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink-primary);
  color: var(--paper-bg);
  padding: 10px 22px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  z-index: 2000;
  animation: toastIn 0.25s ease;
}

@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, 12px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* Responsive Breakpoints */
@media (max-width: 1080px) {
  .reader-stage {
    grid-template-columns: 1fr;
    margin-top: 16px;
  }
  .artwork-column {
    order: -1;
  }
  .card-column {
    order: 1;
  }
  .artwork-card {
    position: static;
    max-width: 560px;
    margin: 0 auto;
    width: 100%;
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 10px 16px;
    flex-wrap: wrap;
  }
  .header-actions {
    order: 2;
    width: 100%;
    min-width: 0;
    overflow-x: auto;
    overscroll-behavior-x: contain;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    touch-action: pan-x;
    padding-bottom: 2px;
  }
  .header-actions::-webkit-scrollbar {
    display: none;
  }
  .header-actions .action-btn {
    flex: 0 0 auto;
    min-height: 38px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
  }
  .search-section {
    order: 3;
    max-width: 100%;
    width: 100%;
  }
  .category-filter-bar {
    padding: 6px 16px 10px;
  }
  .reader-stage {
    padding: 0 16px;
    margin-bottom: 70px;
    touch-action: pan-y;
  }
  .reader-stage img {
    pointer-events: none;
    -webkit-user-drag: none;
    user-select: none;
  }
  .xiehouyu-card {
    padding: 24px 20px;
  }
  .phrase-display-box {
    padding: 20px 16px;
  }
  .riddle-text {
    font-size: 1.65rem;
  }
  .answer-text {
    font-size: 1.55rem;
  }
  .card-footer-pager {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    gap: 8px;
  }
  .card-footer-pager .pager-btn {
    width: 100%;
    min-width: 0;
    gap: 5px;
    padding: 8px 9px;
    border-radius: var(--radius-sm);
  }
  .card-footer-pager .pager-btn:first-child {
    justify-content: flex-start;
  }
  .card-footer-pager .pager-btn:last-child {
    justify-content: flex-end;
  }
  .card-footer-pager .pager-arrow,
  .counter-display {
    flex: 0 0 auto;
    white-space: nowrap;
  }
  .card-footer-pager .pager-text {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.74rem;
  }
  .counter-display {
    font-size: 0.82rem;
    font-variant-numeric: tabular-nums;
  }
  .catalog-grid {
    grid-template-columns: 1fr;
    padding: 14px 16px;
  }
  .keyboard-nav-bar {
    display: none;
  }
}