/* Design System and Variables */
:root {
  --primary-color: #E8701A;
  --primary-hover: #D05D0D;
  --primary-light: #FFF2E4;
  --primary-soft: #FFFDFB;
  
  --bg-main: #FBF9F7;
  --bg-card: #FFFFFF;
  --bg-nav: rgba(255, 255, 255, 0.85);
  --bg-input: #FFFFFF;
  
  --text-main: #2C2017;
  --text-muted: #7A6F66;
  --text-light: #B0A7A0;
  
  --border-color: #ECE7E2;
  --shadow-sm: 0 2px 4px rgba(44, 32, 23, 0.04);
  --shadow-md: 0 8px 16px rgba(44, 32, 23, 0.06);
  --shadow-lg: 0 16px 32px rgba(44, 32, 23, 0.1);
  
  --success: #2E7D32;
  --success-light: #E8F5E9;
  --error: #C62828;
  --error-light: #FFEBEE;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-round: 50%;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Overrides */
body.dark {
  --primary-light: #3D230F;
  --primary-soft: #1E1712;
  
  --bg-main: #131110;
  --bg-card: #1C1918;
  --bg-nav: rgba(28, 25, 24, 0.85);
  --bg-input: #282422;
  
  --text-main: #ECE7E2;
  --text-muted: #A0958C;
  --text-light: #6E635A;
  
  --border-color: #2E2A28;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.4);
  
  --success: #4CAF50;
  --success-light: #1B381E;
  --error: #EF5350;
  --error-light: #3C1E1E;
}

/* Basic Reset & Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  padding-bottom: 60px;
}

a {
  color: inherit;
  text-decoration: none;
}

button, input, select {
  font-family: inherit;
  font-size: inherit;
  outline: none;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-light);
}

/* Utility Layouts */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header Section */
.app-header {
  position: sticky;
  top: 0;
  background-color: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary-color);
  cursor: pointer;
  letter-spacing: 0.5px;
}

.app-logo svg {
  width: 28px;
  height: 28px;
  fill: currentColor;
}

.header-search {
  position: relative;
  width: 300px;
  max-width: 100%;
}

.header-search input {
  width: 100%;
  padding: 10px 16px 10px 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-input);
  color: var(--text-main);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.header-search input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(232, 112, 26, 0.15);
}

.header-search svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-muted);
  pointer-events: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Action Buttons */
.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-main);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.btn-icon svg {
  width: 20px;
  height: 20px;
}

/* Main App Views */
.view-section {
  display: none;
  padding: 30px 0;
  animation: fadeIn var(--transition-normal);
}

.view-section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Dashboard Style */
.dashboard-title-area {
  margin-bottom: 30px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.dashboard-subtitle {
  color: var(--text-muted);
  margin-top: 4px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.stat-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background-color: var(--primary-light);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

.stat-icon svg {
  width: 26px;
  height: 26px;
}

.stat-info h3 {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.2;
}

.stat-info p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Day Cards Grid */
.days-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}

.day-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 180px;
}

.day-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
}

.day-card-number {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--primary-color);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.day-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 8px 0 16px 0;
  color: var(--text-main);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  height: 3.2rem;
  line-height: 1.4;
}

.day-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
}

.day-card-progress-bar {
  height: 6px;
  background-color: var(--border-color);
  border-radius: 3px;
  width: 60%;
  overflow: hidden;
}

.day-card-progress-fill {
  height: 100%;
  background-color: var(--primary-color);
  transition: width var(--transition-normal);
}

/* Learning Area Layout */
.learn-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.learn-title-block {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-back {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-main);
  cursor: pointer;
  font-weight: 600;
  transition: all var(--transition-fast);
}

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

.btn-back svg {
  width: 16px;
  height: 16px;
}

/* Learning Sub-Tabs */
.learn-tabs {
  display: flex;
  background-color: var(--border-color);
  padding: 4px;
  border-radius: var(--radius-md);
}

.learn-tab {
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.learn-tab.active {
  background-color: var(--bg-card);
  color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

/* Configuration Panel (Languages selection) */
.config-bar {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px 24px;
  margin-bottom: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  box-shadow: var(--shadow-sm);
}

.config-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.lang-selectors {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.lang-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-main);
  cursor: pointer;
  user-select: none;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.lang-chip input {
  display: none;
}

.lang-chip:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.lang-chip.selected {
  background-color: var(--primary-light);
  border-color: var(--primary-color);
  color: var(--primary-color);
}

/* Mode Container Panels */
.mode-panel {
  display: none;
  animation: fadeIn var(--transition-normal);
}

.mode-panel.active {
  display: block;
}

/* Flashcard Styles */
.flashcard-outer-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 30px;
  max-width: 680px;
  margin: 0 auto;
}

.flashcard-perspective {
  perspective: 1200px;
  width: 100%;
  height: 420px; /* increased from 380px to prevent overflow */
  cursor: pointer;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform var(--transition-slow);
}

.flashcard-perspective.flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  padding: 28px; /* reduced from 40px to give more space for translations and examples */
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color var(--transition-normal);
}

.flashcard-perspective:hover .flashcard-face {
  border-color: var(--primary-color);
}

/* Card Front */
.flashcard-front {
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 16px;
}

.card-hint-text {
  font-size: 0.85rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 2px;
  position: absolute;
  top: 30px;
}

.card-word-title {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
  word-break: break-word;
  line-height: 1.1;
}

.card-flip-prompt {
  font-size: 0.85rem;
  color: var(--text-muted);
  position: absolute;
  bottom: 30px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.card-flip-prompt svg {
  width: 16px;
  height: 16px;
}

/* Card Back */
.flashcard-back {
  transform: rotateY(180deg);
}

.card-back-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 16px;
  flex-shrink: 0;
}

.card-back-body {
  flex: 1;
  overflow-y: auto;
  margin-top: 16px;
  padding-right: 4px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Custom scrollbar for card back body */
.card-back-body::-webkit-scrollbar {
  width: 4px;
}

.card-back-body::-webkit-scrollbar-track {
  background: transparent;
}

.card-back-body::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: var(--radius-round);
}

.card-back-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--primary-color);
}

.card-translations-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
}

.card-translation-item {
  display: flex;
  align-items: center;
  gap: 14px;
}

.card-lang-tag {
  background-color: var(--border-color);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  min-width: 36px;
  text-align: center;
}

.card-translation-value {
  font-size: 1.1rem;
  font-weight: 600;
}

.card-example-section {
  background-color: var(--primary-soft);
  border-left: 4px solid var(--primary-color);
  padding: 16px;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
  flex-shrink: 0;
}

.card-ex-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  line-height: 1.4;
  text-align: left;
}

.card-ex-badge {
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  padding: 1px 4px;
  border-radius: 4px;
  line-height: 1;
  margin-top: 3px;
  flex-shrink: 0;
}

.card-ex-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  flex: 1;
  line-height: 1.4;
}

/* Primary English example gets bolder weight and main color */
.card-ex-row.english-ex .card-ex-text {
  font-weight: 600;
  color: var(--text-main);
}

.card-ex-row .btn-speaker {
  width: 24px;
  height: 24px;
  margin-left: 0;
  margin-top: 1px;
  flex-shrink: 0;
}

.card-ex-row .btn-speaker svg {
  width: 10px;
  height: 10px;
}

/* Flashcard Controls */
.flashcard-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: 20px;
}

.btn-secondary, .btn-primary {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary {
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-main);
}

.btn-secondary:hover {
  background-color: var(--border-color);
}

.btn-primary {
  border: none;
  background-color: var(--primary-color);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 4px 12px rgba(232, 112, 26, 0.25);
}

.card-counter {
  font-weight: 700;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Mastered Status Controls */
.card-mastery-action {
  display: flex;
  justify-content: center;
  gap: 16px;
  width: 100%;
  margin-top: 10px;
}

.btn-mastery {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-muted);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-mastery.mastered.active {
  background-color: var(--success-light);
  border-color: var(--success);
  color: var(--success);
}

.btn-mastery.review.active {
  background-color: var(--error-light);
  border-color: var(--error);
  color: var(--error);
}

.btn-mastery svg {
  width: 18px;
  height: 18px;
}

/* Speaker / TTS Trigger */
.btn-speaker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-round);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-muted);
  cursor: pointer;
  margin-left: 8px;
  transition: all var(--transition-fast);
  vertical-align: middle;
}

.btn-speaker:hover {
  background-color: var(--primary-light);
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: scale(1.08);
}

.btn-speaker svg {
  width: 14px;
  height: 14px;
}

/* List View Style */
.list-filter-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.list-search {
  flex: 1;
  min-width: 250px;
}

.list-table-container {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  width: 100%;
}

.list-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.list-table th {
  padding: 14px 20px;
  border-bottom: 2px solid var(--border-color);
  vertical-align: middle;
  background-color: var(--primary-soft);
  color: var(--text-muted);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Stable column widths layout */
.list-table th:first-child {
  width: 45%;
}
#th-cn {
  width: 15%;
}
#th-ja {
  width: 15%;
}
#th-ko {
  width: 15%;
}
.list-table th:last-child {
  width: 10%;
}

.list-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  vertical-align: top; /* Align to top for cleaner vertical layout */
}

.word-row {
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.word-row:hover {
  background-color: var(--primary-soft);
}

.word-row.expanded {
  background-color: rgba(99, 102, 241, 0.03); /* subtle primary tint when expanded */
}

.list-word-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.list-word-header .btn-speaker {
  margin-left: 0;
  flex-shrink: 0;
}

.list-word-main {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  display: inline-block;
}

/* Expand chevron button */
.btn-expand-ex {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  border-radius: var(--radius-sm);
  margin-right: -2px;
}

.btn-expand-ex:hover {
  background-color: var(--border-color);
  color: var(--text-main);
}

.chevron-icon {
  width: 16px;
  height: 16px;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* When parent word-row is expanded, rotate chevron */
.word-row.expanded .chevron-icon {
  transform: rotate(90deg);
  color: var(--primary-color);
}

/* Collapsible Example Sentence Row Styles */
.example-row td {
  padding: 0 20px;
  border-bottom: none;
  background-color: transparent;
  transition: padding 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.list-example-fullwidth {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
  border-left: 3px solid var(--primary-color);
  padding-left: 16px;
  margin-left: 8px;
  margin-bottom: 0px;
}

/* Expanded state overrides */
.example-row.expanded td {
  padding: 8px 20px 18px 20px;
  border-bottom: 1px solid var(--border-color);
}

.example-row.expanded .list-example-fullwidth {
  max-height: 500px;
  padding-top: 4px;
  padding-bottom: 4px;
}

.list-ex-row.english-ex .list-ex-text {
  font-weight: 600;
  color: var(--text-main);
}

.list-ex-row {
  margin-top: 6px;
  display: flex;
  align-items: flex-start;
  gap: 6px;
  line-height: 1.4;
}

.list-ex-badge {
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  padding: 1px 4px;
  border-radius: 4px;
  line-height: 1;
  margin-top: 3px;
  flex-shrink: 0;
}

.list-ex-text {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.4;
  flex: 1;
}

.list-ex-row .btn-speaker {
  width: 24px;
  height: 24px;
  margin-left: 0;
  margin-top: 1px;
  flex-shrink: 0;
}

.list-ex-row .btn-speaker svg {
  width: 10px;
  height: 10px;
}

.list-translation-cell {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-main);
  min-height: 32px;
  white-space: nowrap;
}

.list-translation-cell .btn-speaker {
  margin-left: 0;
  flex-shrink: 0;
}

.translation-text {
  line-height: 1.4;
}

.list-status-cell {
  display: flex;
  align-items: center;
  min-height: 32px;
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.badge-status.unlearned {
  background-color: var(--border-color);
  color: var(--text-muted);
}

.badge-status.mastered {
  background-color: var(--success-light);
  color: var(--success);
}

.badge-status.review {
  background-color: var(--error-light);
  color: var(--error);
}

/* Quiz Mode styles */
.quiz-wrapper {
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.quiz-progress-section {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.quiz-progress-bar {
  flex: 1;
  height: 8px;
  background-color: var(--border-color);
  border-radius: 4px;
  margin: 0 16px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background-color: var(--primary-color);
  transition: width var(--transition-normal);
  width: 0%;
}

.quiz-question-type {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--primary-color);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.quiz-question-text {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
}

.quiz-options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 10px 0;
}

.quiz-option {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-main);
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.quiz-option:hover {
  border-color: var(--primary-color);
  background-color: var(--primary-soft);
}

.quiz-option.correct {
  border-color: var(--success);
  background-color: var(--success-light);
  color: var(--success);
}

.quiz-option.incorrect {
  border-color: var(--error);
  background-color: var(--error-light);
  color: var(--error);
}

.quiz-option-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: var(--radius-round);
}

.quiz-option.correct .quiz-option-indicator {
  background-color: var(--success);
  color: #FFFFFF;
}

.quiz-option.incorrect .quiz-option-indicator {
  background-color: var(--error);
  color: #FFFFFF;
}

/* Quiz Result Panel */
.quiz-result-view {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.quiz-result-score {
  font-size: 4rem;
  font-weight: 900;
  color: var(--primary-color);
  margin-top: 10px;
}

.quiz-result-message {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.quiz-result-details {
  font-size: 0.95rem;
  color: var(--text-muted);
}

/* Global Search Page */
.search-results-meta {
  margin-bottom: 24px;
  font-weight: 700;
  color: var(--text-muted);
}

/* Keyboard Hint Banner */
.keyboard-hint-banner {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px 20px;
  display: flex;
  gap: 16px;
  justify-content: center;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  width: 100%;
  margin-top: 20px;
  box-shadow: var(--shadow-sm);
}

.key-cap {
  background-color: var(--bg-main);
  border: 1px solid var(--text-light);
  border-bottom-width: 3px;
  border-radius: 4px;
  padding: 2px 6px;
  font-weight: 800;
  font-family: monospace;
}

/* Mobile Responsiveness Rules */
@media (max-width: 768px) {
  body {
    padding-bottom: 90px;
  }
  
  .header-container {
    height: auto;
    padding: 12px 0;
    flex-direction: column;
    gap: 12px;
  }
  
  .header-search {
    width: 100%;
  }
  
  .learn-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .learn-tabs {
    width: 100%;
  }
  
  .learn-tab {
    flex: 1;
    text-align: center;
    padding: 8px 10px;
  }
  
  .flashcard-perspective {
    height: 420px;
  }
  
  .flashcard-face {
    padding: 24px;
  }
  
  .card-word-title {
    font-size: 2.5rem;
  }
  
  .list-table th:nth-child(3),
  .list-table td:nth-child(3),
  .list-table th:nth-child(4),
  .list-table td:nth-child(4) {
    display: none; /* Hide JP/KO columns on small screens by default */
  }
  
  .btn-mastery {
    padding: 10px;
    font-size: 0.85rem;
  }
  
  .quiz-wrapper {
    padding: 24px;
  }
}