/* ============================================
   ALCPT Quiz PWA - Mobile-First Dark Theme
   ============================================ */

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

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-card-hover: #273549;
  --bg-input: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #22c55e;
  --success-bg: rgba(34, 197, 94, 0.15);
  --success-border: rgba(34, 197, 94, 0.4);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.15);
  --danger-border: rgba(239, 68, 68, 0.4);
  --warning: #f59e0b;
  --border: #334155;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans TC', 'Microsoft JhengHei', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-font-smoothing: antialiased;
}

/* --- App Container --- */
#app {
  max-width: 768px;
  margin: 0 auto;
  padding: 0 16px;
  min-height: 100vh;
  min-height: 100dvh;
  position: relative;
}

/* --- Screen transitions --- */
.screen {
  display: none;
  animation: fadeIn 0.3s ease;
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes popIn {
  0% { transform: scale(0.9); opacity: 0; }
  70% { transform: scale(1.02); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* ============================================
   HOME SCREEN
   ============================================ */
.home-header {
  text-align: center;
  padding: 40px 0 24px;
  position: relative;
}

.home-header h1 {
  font-size: 1.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, #60a5fa, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
  letter-spacing: 1px;
}

.home-header .subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Stats bar */
.stats-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  flex: 1;
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 14px 12px;
  text-align: center;
  border: 1px solid var(--border);
}

.stat-card .stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-card .stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Section title */
.section-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.section-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.section-header-row .section-title {
  margin-bottom: 0;
}

.home-mode-toggle {
  display: flex;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.home-mode-btn {
  padding: 4px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  border: none;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.home-mode-btn.active {
  background: var(--accent);
  color: white;
}

.home-mode-btn:active {
  transform: scale(0.95);
}
.shuffle-toggle-btn {
  padding: 5px 12px;
  border-radius: 16px;
  border: 1.5px solid var(--border);
  background: var(--card-bg);
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}
.shuffle-toggle-btn.active {
  border-color: var(--warning);
  background: rgba(245,158,11,0.15);
  color: var(--warning);
}

/* Mock exam section */
.mock-exam-section {
  margin-bottom: 20px;
}

.mock-exam-cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mock-exam-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.mock-exam-card:hover,
.mock-exam-card:active {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.mock-exam-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.mock-exam-info {
  flex: 1;
  min-width: 0;
}

.mock-exam-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.mock-exam-subtitle {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.mock-exam-card .round-progress {
  width: 100%;
  margin-top: 8px;
  height: 4px;
  background: var(--bg-input);
  border-radius: 2px;
  overflow: hidden;
}

.mock-exam-card .round-progress .progress-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.5s ease;
}

.mock-exam-card .round-score {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Round grid */
.rounds-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  padding-bottom: 32px;
}

.round-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 10px 14px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  -webkit-tap-highlight-color: transparent;
}

.round-card:hover,
.round-card:active {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.round-card .round-num {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.round-card .round-label {
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.round-card .round-progress {
  margin-top: 8px;
  height: 4px;
  background: var(--bg-input);
  border-radius: 2px;
  overflow: hidden;
}

.round-card .round-progress .progress-fill {
  height: 100%;
  border-radius: 2px;
  transition: width 0.5s ease;
}

.round-card .round-score {
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============================================
   QUIZ SCREEN
   ============================================ */
.quiz-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 10px;
  position: sticky;
  top: 0;
  background: var(--bg-primary);
  z-index: 10;
}

.quiz-topbar .back-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: color var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.quiz-topbar .back-btn:hover {
  color: var(--text-primary);
}

.quiz-topbar .round-title {
  font-weight: 700;
  font-size: 1rem;
}

.quiz-topbar .question-counter {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.quiz-topbar .timer {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  min-width: 50px;
  text-align: right;
}

/* Progress bar */
.quiz-progress {
  height: 4px;
  background: var(--bg-input);
  border-radius: 2px;
  margin-bottom: 20px;
  overflow: hidden;
}

.quiz-progress .progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  border-radius: 2px;
  transition: width 0.4s ease;
}

/* Quiz settings toolbar */
.quiz-settings {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.quiz-setting-btn {
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.quiz-setting-btn.active {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border-color: rgba(59, 130, 246, 0.4);
}

.quiz-setting-btn:active {
  transform: scale(0.95);
}

/* Top next button */
.next-btn-wrap.next-btn-top {
  display: none;
  padding: 0 0 12px;
}

.next-btn-wrap.next-btn-top.visible {
  display: block;
  animation: slideUp 0.2s ease;
}

/* Question type badge */
.question-type {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.question-type.listening {
  background: rgba(59, 130, 246, 0.15);
  color: #60a5fa;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.question-type.reading {
  background: rgba(168, 85, 247, 0.15);
  color: #c084fc;
  border: 1px solid rgba(168, 85, 247, 0.3);
}

/* Audio player */
.audio-player {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 12px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.audio-player.hidden {
  display: none;
}

.play-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #2563eb);
  border: none;
  color: white;
  font-size: 1.3rem;
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
  -webkit-tap-highlight-color: transparent;
}

.play-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.5);
}

.play-btn:active {
  transform: scale(0.95);
}

.play-btn.playing {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
}

.audio-info {
  text-align: left;
}

.audio-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0;
}

.play-count {
  font-size: 0.7rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Question text */
.question-text {
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 12px;
  padding: 12px 14px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  white-space: pre-wrap;
}

.question-text.listening-unanswered {
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
}

.question-number {
  display: inline-block;
  background: var(--accent);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  margin-bottom: 8px;
}

/* Options */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.option-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.95rem;
  line-height: 1.5;
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
  min-height: 52px;
  -webkit-tap-highlight-color: transparent;
}

.option-btn:hover:not(.disabled) {
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.option-btn:active:not(.disabled) {
  transform: scale(0.98);
}

.option-btn .option-letter {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  transition: all var(--transition);
}

.option-btn .option-text {
  flex: 1;
  padding-top: 3px;
}

/* Option states after answering */
.option-btn.correct {
  border-color: var(--success);
  background: var(--success-bg);
}

.option-btn.correct .option-letter {
  background: var(--success);
  color: white;
}

.option-btn.wrong {
  border-color: var(--danger);
  background: var(--danger-bg);
}

.option-btn.wrong .option-letter {
  background: var(--danger);
  color: white;
}

.option-btn.disabled {
  cursor: default;
  opacity: 0.7;
}

.option-btn.correct.disabled,
.option-btn.wrong.disabled {
  opacity: 1;
}

/* Explanation */
.explanation-box {
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 20px;
  font-size: 0.9rem;
  line-height: 1.6;
  animation: slideUp 0.3s ease;
  display: none;
}

.explanation-box.visible {
  display: block;
}

.explanation-box .explanation-label {
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
  font-size: 0.8rem;
}

/* Next button */
.next-btn-wrap {
  padding: 8px 0 32px;
  display: none;
}

.next-btn-wrap.visible {
  display: block;
  animation: slideUp 0.2s ease;
}

.next-btn {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, var(--accent), #2563eb);
  border: none;
  border-radius: var(--radius);
  color: white;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.next-btn:hover {
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
  transform: translateY(-1px);
}

.next-btn:active {
  transform: translateY(0) scale(0.98);
}

/* ============================================
   RESULTS SCREEN
   ============================================ */
.results-screen {
  padding-top: 24px;
  padding-bottom: 40px;
}

.results-header {
  text-align: center;
  margin-bottom: 28px;
}

.results-header h2 {
  font-size: 1.3rem;
  margin-bottom: 4px;
}

.results-header .round-info {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Score circle */
.score-circle-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: 28px;
}

.score-circle {
  width: 160px;
  height: 160px;
  position: relative;
}

.score-circle svg {
  transform: rotate(-90deg);
}

.score-circle .circle-bg {
  fill: none;
  stroke: var(--bg-input);
  stroke-width: 10;
}

.score-circle .circle-fill {
  fill: none;
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 1.5s ease;
}

.score-circle .score-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.score-circle .score-pct {
  font-size: 2rem;
  font-weight: 800;
  display: block;
}

.score-circle .score-fraction {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Breakdown */
.score-breakdown {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 28px;
}

.breakdown-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.breakdown-card .breakdown-icon {
  font-size: 1.5rem;
  margin-bottom: 4px;
}

.breakdown-card .breakdown-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.breakdown-card .breakdown-value {
  font-size: 1.2rem;
  font-weight: 700;
}

/* Time card */
.time-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  text-align: center;
  margin-bottom: 28px;
}

.time-card .time-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.time-card .time-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Wrong answers list */
.wrong-answers-section {
  margin-bottom: 28px;
}

.wrong-answers-section h3 {
  font-size: 1rem;
  margin-bottom: 12px;
  color: var(--danger);
  display: flex;
  align-items: center;
  gap: 6px;
}

.wrong-answer-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 10px;
}

.wrong-answer-item .wa-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.wrong-answer-item .wa-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

.wrong-answer-item .wa-type {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 10px;
}

.wrong-answer-item .wa-question {
  font-size: 0.9rem;
  margin-bottom: 8px;
  line-height: 1.5;
}

.wrong-answer-item .wa-answers {
  font-size: 0.8rem;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.wrong-answer-item .wa-your {
  color: var(--danger);
}

.wrong-answer-item .wa-correct {
  color: var(--success);
}

.wrong-answer-item .wa-explanation {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* No wrong answers */
.no-wrong {
  text-align: center;
  padding: 24px;
  color: var(--success);
  font-size: 1.1rem;
  font-weight: 600;
}

/* Results buttons */
.results-buttons {
  display: flex;
  gap: 12px;
}

.results-buttons button {
  flex: 1;
  padding: 14px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.btn-retry {
  background: var(--bg-card);
  border: 2px solid var(--accent);
  color: var(--accent);
}

.btn-retry:hover {
  background: rgba(59, 130, 246, 0.1);
}

.btn-home {
  background: linear-gradient(135deg, var(--accent), #2563eb);
  border: none;
  color: white;
}

.btn-home:hover {
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

/* ============================================
   LOADING
   ============================================ */
.loading-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  gap: 16px;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* ============================================
   CONFIRM DIALOG
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

.modal-overlay.visible {
  display: flex;
}

.modal-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  max-width: 340px;
  width: 100%;
  text-align: center;
  animation: popIn 0.25s ease;
}

.modal-box h3 {
  margin-bottom: 8px;
  font-size: 1.1rem;
}

.modal-box p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.modal-buttons {
  display: flex;
  gap: 10px;
}

.modal-buttons button {
  flex: 1;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.modal-cancel {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

/* New modal buttons (column layout) */
.modal-buttons-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.modal-buttons-col button {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.modal-btn-save {
  background: var(--accent);
  color: white;
}

.modal-btn-discard {
  background: var(--danger);
  color: white;
}

.modal-btn-cancel {
  background: var(--bg-input);
  border: 1px solid var(--border) !important;
  color: var(--text-primary);
}

/* ============================================
   THEME TOGGLE
   ============================================ */
.home-header {
  position: relative;
}

.theme-toggle {
  position: absolute;
  top: 40px;
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  transform: scale(1.1);
}

.theme-icon {
  line-height: 1;
}

/* ============================================
   LIGHT MODE
   ============================================ */
html.light {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-input: #e2e8f0;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
}

html.light body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

html.light .quiz-topbar {
  background: var(--bg-primary);
}

html.light .home-header h1 {
  background: linear-gradient(135deg, #2563eb, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

html.light .play-btn {
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

html.light .next-btn {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
}

/* Light mode color annotations */
html.light .c1 { color: #16a34a; }
html.light .c2 { color: #2563eb; }
html.light .c3 { color: #ea580c; }
html.light .c4 { color: #db2777; }
html.light .c5 { color: #7c3aed; }
html.light .c6 { color: #0891b2; }

html.light .option-btn.correct .sentence-zh {
  color: #16a34a;
  border-top-color: rgba(22, 163, 74, 0.3);
}

html.light .option-btn.wrong .sentence-zh {
  color: #dc2626;
  border-top-color: rgba(220, 38, 38, 0.3);
}

html.light .modal-overlay {
  background: rgba(0, 0, 0, 0.3);
}

/* ============================================
   REVEAL QUESTION BUTTON
   ============================================ */
.reveal-btn {
  display: inline-block;
  margin-top: 8px;
  padding: 6px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.reveal-btn:hover {
  background: var(--accent);
  color: white;
}

/* ============================================
   DICTIONARY LINK
   ============================================ */
.dict-link-wrap {
  text-align: center;
  padding: 16px 0 40px;
}

.dict-link-btn {
  padding: 14px 32px;
  background: var(--bg-card);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  color: var(--accent);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.dict-link-btn:hover {
  background: var(--accent);
  color: white;
}

/* ============================================
   CONTACT / SUPPORT SECTION
   ============================================ */
.contact-section {
  text-align: center;
  padding: 0 0 40px;
}

.contact-title {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: 10px;
}

.contact-buttons {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 24px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
  border: 1px solid transparent;
}

.contact-icon {
  font-size: 1rem;
  line-height: 1;
}

.contact-line {
  background: rgba(6, 199, 85, 0.12);
  color: #06c755;
  border-color: rgba(6, 199, 85, 0.3);
}

.contact-line:hover {
  background: #06c755;
  color: white;
}

.contact-ig {
  background: rgba(225, 48, 108, 0.12);
  color: #e1306c;
  border-color: rgba(225, 48, 108, 0.3);
}

.contact-ig:hover {
  background: #e1306c;
  color: white;
}

.contact-email {
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent);
  border-color: rgba(59, 130, 246, 0.3);
}

.contact-email:hover {
  background: var(--accent);
  color: white;
}

/* Light mode contact buttons */
html.light .contact-line { background: rgba(6, 199, 85, 0.08); }
html.light .contact-ig { background: rgba(225, 48, 108, 0.08); }
html.light .contact-email { background: rgba(37, 99, 235, 0.08); }

/* ============================================
   HAMBURGER BUTTON & SIDEBAR
   ============================================ */
.hamburger-btn {
  position: absolute;
  top: 40px;
  left: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--text-secondary);
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
  z-index: 2;
}

.hamburger-btn:hover {
  background: var(--bg-card-hover, var(--bg-secondary));
  transform: scale(1.1);
}

.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 200;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.sidebar-overlay.visible {
  visibility: visible;
  opacity: 1;
}

.sidebar-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: 280px;
  max-width: 80vw;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  z-index: 201;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.sidebar-overlay.visible .sidebar-drawer {
  transform: translateX(0);
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 16px 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.sidebar-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
  border-radius: var(--radius-sm, 4px);
  transition: color var(--transition);
}

.sidebar-close:hover {
  color: var(--text-primary);
}

.sidebar-content {
  padding: 8px 0;
  flex: 1;
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  width: 100%;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition);
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.sidebar-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

html.light .sidebar-item:hover {
  background: rgba(0, 0, 0, 0.04);
}

.sidebar-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  width: 24px;
  text-align: center;
}

.sidebar-link {
  color: var(--text-primary);
  text-decoration: none;
}

.sidebar-divider {
  height: 1px;
  background: var(--border);
  margin: 8px 16px;
}

.sidebar-visitor-wrap {
  flex-wrap: wrap;
  cursor: default;
}

.sidebar-visitor-badge {
  height: 20px;
  border-radius: 4px;
  margin-left: 36px;
  margin-top: 4px;
  opacity: 0.8;
}

.sidebar-contact-title {
  color: var(--text-muted, var(--text-secondary));
  font-size: 0.8rem;
  padding: 8px 20px 0;
  margin: 0;
}

html.light .sidebar-overlay {
  background: rgba(0, 0, 0, 0.25);
}

/* ============================================
   DICTIONARY SCREEN
   ============================================ */
.dict-search-wrap {
  padding: 8px 0 12px;
  position: sticky;
  top: 90px;
  background: var(--bg-primary);
  z-index: 8;
}

.dict-search {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition);
}

.dict-search:focus {
  border-color: var(--accent);
}

.dict-search::placeholder {
  color: var(--text-muted);
}

.dict-alpha-bar {
  display: flex;
  gap: 6px;
  padding: 8px 4px 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  position: sticky;
  top: 148px;
  background: var(--bg-primary);
  z-index: 7;
}
.dict-alpha-bar::-webkit-scrollbar {
  display: none;
}

.alpha-btn {
  min-width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
  flex-shrink: 0;
}

.alpha-btn:hover {
  background: var(--accent);
  color: white;
}

.dict-letter-header {
  padding: 8px 4px 4px;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  margin-top: 8px;
  position: sticky;
  top: 287px;
  background: var(--bg-primary);
  z-index: 5;
}

.dict-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 4px;
  border-bottom: 1px solid rgba(100,100,100,0.1);
}

.dict-word {
  font-weight: 600;
  color: var(--text-primary);
  min-width: 100px;
  font-size: 0.9rem;
}

.dict-meaning {
  flex: 1;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.dict-freq {
  font-size: 0.7rem;
  color: var(--text-muted);
  background: var(--bg-input);
  padding: 2px 6px;
  border-radius: 8px;
  flex-shrink: 0;
}

.dict-list {
  padding-bottom: 40px;
}

.dict-count {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ============================================
   COLOR-CODED WORD ANNOTATIONS
   ============================================ */
.annotated {
  line-height: 1.8;
}

.question-text.annotated {
  line-height: 1.9;
  padding: 14px 16px;
}

/* Word with color + Chinese in parens */
.cw {
  font-weight: 600;
}

.ct {
  font-size: 0.7em;
  font-weight: 500;
  opacity: 0.85;
  margin-right: 1px;
}

/* 6 cycling colors - dark mode */
.c1 { color: #4ade80; }
.c2 { color: #60a5fa; }
.c3 { color: #fb923c; }
.c4 { color: #f472b6; }
.c5 { color: #a78bfa; }
.c6 { color: #22d3ee; }

/* Sentence translation line */
.sentence-zh {
  display: block;
  font-size: 0.82em;
  color: var(--text-secondary);
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px dashed var(--border);
  font-weight: 400;
  line-height: 1.5;
}

/* Options annotated */
.option-btn .option-text .sentence-zh {
  font-size: 0.78em;
  margin-top: 4px;
  padding-top: 4px;
}

/* Correct option sentence translation */
.option-btn.correct .sentence-zh {
  color: #86efac;
  border-top-color: rgba(34, 197, 94, 0.3);
}

/* Wrong option sentence translation */
.option-btn.wrong .sentence-zh {
  color: #fca5a5;
  border-top-color: rgba(239, 68, 68, 0.3);
}

/* Phrase annotation underline */
.cp {
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}

/* Color toggle dots */
.color-toggles {
  display: inline-flex;
  gap: 4px;
  align-items: center;
  vertical-align: middle;
}

.ct-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  padding: 0;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
  box-sizing: border-box;
}

.ct-dot-1 { background: #4ade80; }
.ct-dot-2 { background: #60a5fa; }
.ct-dot-3 { background: #fb923c; }
.ct-dot-4 { background: #f472b6; }
.ct-dot-5 { background: #a78bfa; }
.ct-dot-6 { background: #22d3ee; }

html.light .ct-dot-1 { background: #16a34a; }
html.light .ct-dot-2 { background: #2563eb; }
html.light .ct-dot-3 { background: #ea580c; }
html.light .ct-dot-4 { background: #db2777; }
html.light .ct-dot-5 { background: #7c3aed; }
html.light .ct-dot-6 { background: #0891b2; }

.ct-dot:hover {
  transform: scale(1.2);
}

.ct-dot.off {
  opacity: 0.2;
  transform: scale(0.75);
}

/* Per-color hide rules */
body.hide-c1 .cw.c1 .ct { display: none; }
body.hide-c1 .cw.c1 { color: inherit !important; font-weight: inherit; text-decoration: none; }

body.hide-c2 .cw.c2 .ct { display: none; }
body.hide-c2 .cw.c2 { color: inherit !important; font-weight: inherit; text-decoration: none; }

body.hide-c3 .cw.c3 .ct { display: none; }
body.hide-c3 .cw.c3 { color: inherit !important; font-weight: inherit; text-decoration: none; }

body.hide-c4 .cw.c4 .ct { display: none; }
body.hide-c4 .cw.c4 { color: inherit !important; font-weight: inherit; text-decoration: none; }

body.hide-c5 .cw.c5 .ct { display: none; }
body.hide-c5 .cw.c5 { color: inherit !important; font-weight: inherit; text-decoration: none; }

body.hide-c6 .cw.c6 .ct { display: none; }
body.hide-c6 .cw.c6 { color: inherit !important; font-weight: inherit; text-decoration: none; }

/* When ALL colors are hidden, also hide sentence translation */
body.hide-c1.hide-c2.hide-c3.hide-c4.hide-c5.hide-c6 .sentence-zh {
  display: none;
}

/* ============================================
   VISITOR BADGE
   ============================================ */
.visitor-count-wrap {
  text-align: center;
  margin-top: 8px;
  min-height: 22px;
}

.visitor-badge {
  height: 20px;
  border-radius: 4px;
  opacity: 0.8;
  transition: opacity var(--transition);
}

.visitor-badge:hover {
  opacity: 1;
}

/* ============================================
   CHANGELOG
   ============================================ */
.home-actions {
  text-align: center;
  margin-bottom: 16px;
}

.changelog-btn {
  padding: 8px 20px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.changelog-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.changelog-box {
  max-width: 420px;
  max-height: 75vh;
  text-align: left;
}

.changelog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.changelog-header h3 {
  margin-bottom: 0;
}

.changelog-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 4px 8px;
  line-height: 1;
}

.changelog-list {
  max-height: 55vh;
  overflow-y: auto;
}

.changelog-item {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(100,100,100,0.1);
  font-size: 0.85rem;
}

.changelog-date {
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
  font-size: 0.78rem;
}

.changelog-text {
  color: var(--text-primary);
  line-height: 1.4;
}

/* ============================================
   ROUND VOCAB BUTTON
   ============================================ */
.round-vocab-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  background: none;
  border: none;
  font-size: 0.65rem;
  cursor: pointer;
  opacity: 0.4;
  transition: opacity var(--transition);
  padding: 4px;
  line-height: 1;
  -webkit-tap-highlight-color: transparent;
}

.round-card:hover .round-vocab-btn,
.round-vocab-btn:hover {
  opacity: 1;
}

/* ============================================
   DICTIONARY FILTER BAR
   ============================================ */
.dict-filter-bar {
  display: flex;
  gap: 8px;
  align-items: center;
  padding: 8px 0 0;
  position: sticky;
  top: 48px;
  background: var(--bg-primary);
  z-index: 9;
}

.dict-round-filter {
  flex: 1;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
  cursor: pointer;
}

.dict-round-filter:focus {
  border-color: var(--accent);
}

/* ============================================
   DICTIONARY BOOKMARK
   ============================================ */
.dict-bookmark {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.85rem;
  flex-shrink: 0;
  transition: color var(--transition), transform var(--transition);
  padding: 4px 2px;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.dict-bookmark:hover {
  transform: scale(1.2);
}

.dict-bookmark.active {
  color: #f59e0b;
}

.dict-bookmark-filter {
  padding: 8px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}

.dict-bookmark-filter.active {
  background: rgba(245, 158, 11, 0.15);
  border-color: #f59e0b;
  color: #f59e0b;
}

/* ============================================
   DICTIONARY SORT BUTTON
   ============================================ */
.dict-sort-btn {
  padding: 8px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.dict-sort-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================
   POS LEGEND
   ============================================ */
.pos-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  padding: 6px 4px 10px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
  position: sticky;
  top: 228px;
  background: var(--bg-primary);
  z-index: 6;
}

.pos-legend-item {
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.pos-legend-item b {
  color: var(--accent);
  font-weight: 700;
  margin-right: 2px;
}

/* ============================================
   DICTIONARY POS LABEL
   ============================================ */
.dict-pos {
  display: inline-block;
  font-size: 0.6rem;
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 4px;
  padding: 0 4px;
  margin-left: 6px;
  font-weight: 600;
  vertical-align: middle;
  line-height: 1.6;
}

/* ============================================
   WORD QUIZ
   ============================================ */
.wordquiz-btn {
  margin-left: 8px;
  border-color: #a78bfa !important;
  color: #a78bfa !important;
}

.wordquiz-btn:hover {
  background: #a78bfa !important;
  color: white !important;
}

html.light .wordquiz-btn {
  border-color: #7c3aed !important;
  color: #7c3aed !important;
}

html.light .wordquiz-btn:hover {
  background: #7c3aed !important;
  color: white !important;
}

.rsvp-link-btn {
  margin-left: 8px;
  border-color: #f59e0b !important;
  color: #f59e0b !important;
}
.rsvp-link-btn:hover { background: #f59e0b !important; color: white !important; }

/* ============================================
   WORD QUIZ – result dict button
   ============================================ */
.btn-dict {
  background: var(--bg-card);
  border: 2px solid #10b981;
  color: #10b981;
  flex: 1;
  padding: 14px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}
.btn-dict:hover { background: rgba(16,185,129,0.1); }

/* ============================================
   RSVP MODE
   ============================================ */
.rsvp-controls-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 14px 20px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.rsvp-bpm-ctrl {
  display: flex;
  align-items: center;
  gap: 10px;
}
.rsvp-bpm-btn {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: background var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.rsvp-bpm-btn:hover { background: var(--accent); color: white; }
.rsvp-bpm-display {
  display: flex; flex-direction: column; align-items: center;
  min-width: 56px;
}
#rsvp-bpm-val {
  font-size: 1.8rem; font-weight: 700; color: var(--text); line-height: 1;
}
.rsvp-bpm-label {
  font-size: 0.7rem; color: var(--text-muted); letter-spacing: 1px; text-transform: uppercase;
}
.rsvp-play-btn {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #2563eb);
  border: none; color: white;
  font-size: 1.3rem; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(59,130,246,0.35);
  transition: transform 0.1s, box-shadow 0.2s;
  -webkit-tap-highlight-color: transparent;
}
.rsvp-play-btn:active { transform: scale(0.93); }
.rsvp-round-sel { font-size: 0.85rem; }

.rsvp-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 44vh;
  padding: 24px 20px;
  overflow: hidden;
}
/* subtle vertical guide line at center */
.rsvp-guide-dot {
  position: absolute;
  top: 0; bottom: 0;
  left: 50%;
  width: 1px;
  background: rgba(239,68,68,0.12);
  pointer-events: none;
}
.rsvp-word-wrap {
  display: flex;
  align-items: baseline;
  font-size: clamp(2rem, 6vw, 3rem);
  font-family: 'Courier New', Courier, monospace;
  letter-spacing: 0.05em;
  line-height: 1.2;
  white-space: nowrap;
}
.rsvp-before {
  display: inline-block;
  min-width: 5ch;
  text-align: right;
  color: var(--text);
}
.rsvp-pivot {
  display: inline-block;
  color: #ef4444;
  font-weight: 900;
  position: relative;
}
.rsvp-pivot::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0; right: 0;
  height: 3px;
  background: #ef4444;
  border-radius: 2px;
}
.rsvp-after {
  display: inline-block;
  min-width: 5ch;
  text-align: left;
  color: var(--text);
}
.rsvp-meaning {
  margin-top: 18px;
  font-size: 1.05rem;
  color: var(--text-secondary);
  text-align: center;
  min-height: 1.4em;
}
.rsvp-nav-bar {
  display: flex;
  justify-content: center;
  gap: 16px;
  padding: 10px 20px 24px;
}
.rsvp-nav-btn {
  padding: 8px 22px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.95rem;
  cursor: pointer;
  transition: background var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.rsvp-nav-btn:hover { background: var(--bg-secondary); }

.wq-setup-body {
  max-width: 400px;
  margin: 32px auto 0;
  padding: 0 8px;
}

.wq-option-group {
  margin-bottom: 24px;
}

.wq-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.wq-count-btns {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.wq-count-btn {
  flex: 1;
  min-width: 48px;
  padding: 10px 6px;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.wq-count-btn:hover {
  border-color: var(--accent);
}

.wq-count-btn.active {
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent);
}

.wq-infinite-btn.active {
  border-color: #a78bfa;
  background: rgba(167, 139, 250, 0.1);
  color: #a78bfa;
}

.wq-mode-btns {
  display: flex;
  gap: 8px;
}

.wq-mode-btn {
  flex: 1;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.wq-mode-btn:hover {
  border-color: var(--accent);
}

.wq-mode-btn.active {
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  color: var(--accent);
}

.wq-start {
  margin-top: 8px;
}

.wq-question-area {
  text-align: center;
  padding: 32px 16px 24px;
}

.wq-prompt {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  word-break: break-word;
}

.wq-pos-hint {
  font-size: 0.8rem;
  color: var(--accent);
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
}

.wq-wrong-item {
  padding: 12px 14px;
}

.wq-wrong-word {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.wq-wrong-meaning {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

/* ============================================
   PASSWORD LOCK SCREEN
   ============================================ */
.lock-screen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  padding: 20px;
}

.lock-screen.hidden {
  display: none;
}

.lock-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  width: 100%;
  max-width: 360px;
  box-shadow: var(--shadow-lg);
}

.lock-icon {
  font-size: 3rem;
  margin-bottom: 12px;
}

.lock-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.lock-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.lock-input {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg-input);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 1rem;
  text-align: center;
  letter-spacing: 2px;
  outline: none;
  transition: border-color var(--transition);
}

.lock-input:focus {
  border-color: var(--accent);
}

.lock-input.shake {
  animation: shake 0.4s ease;
  border-color: var(--danger);
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

.lock-btn {
  width: 100%;
  margin-top: 14px;
  padding: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border: none;
  border-radius: var(--radius);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity var(--transition);
}

.lock-btn:hover {
  opacity: 0.9;
}

.lock-error {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--danger);
  opacity: 0;
  transition: opacity var(--transition);
}

.lock-error.visible {
  opacity: 1;
}

/* Warning modal */
.warn-overlay {
  position: fixed;
  inset: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  padding: 20px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.warn-card {
  background: var(--bg-card);
  border: 2px solid var(--warning);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  animation: warnPop 0.3s ease;
}

@keyframes warnPop {
  0% { transform: scale(0.85); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.warn-icon {
  font-size: 3rem;
  margin-bottom: 8px;
}

.warn-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--warning);
  margin-bottom: 12px;
}

.warn-text {
  font-size: 1rem;
  color: var(--text-primary);
  line-height: 1.7;
  margin-bottom: 24px;
  font-weight: 600;
}

.warn-ok-btn {
  padding: 12px 40px;
  background: var(--warning);
  border: none;
  border-radius: var(--radius);
  color: #000;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: opacity var(--transition);
}

.warn-ok-btn:hover {
  opacity: 0.85;
}

/* ============================================
   TOEIC SECTION
   ============================================ */
.toeic-section {
  margin-bottom: 20px;
}

.toeic-section .section-title {
  color: var(--accent);
}

.toeic-card .mock-exam-icon {
  font-size: 1.6rem;
}

/* Passage box for TOEIC reading passages */
.passage-box {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 0 16px 16px;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-wrap: break-word;
  max-height: 320px;
  overflow-y: auto;
}

html.light .passage-box {
  background: #f3f4f6;
  border-color: #d1d5db;
}

/* TOEIC Part 1 Photo Card */
.toeic-photo-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 16px;
}
.toeic-photo-icon {
  font-size: 3rem;
  line-height: 1;
  flex-shrink: 0;
}
.toeic-photo-desc {
  font-size: 0.88rem;
  line-height: 1.6;
  color: #cbd5e1;
  font-style: italic;
}
html.light .toeic-photo-desc {
  color: #475569;
}

/* Passage header with play button */
.passage-header {
  margin-bottom: 10px;
  display: flex;
  align-items: center;
}
.passage-play-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}
.passage-play-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.04);
}
.passage-play-btn.playing {
  background: var(--warning);
}
.passage-text {
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* ============================================
   DUPLICATES SCREEN
   ============================================ */
.dupes-count {
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.dupes-intro {
  padding: 12px 16px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border);
}
.dupes-list {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.dupe-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.dupe-header {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.dupe-idx {
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.dupe-tag {
  background: var(--bg-input);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.dupe-question {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.dupe-options {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.dupe-opt {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 4px 0;
}
.dupe-opt.correct {
  color: var(--success);
  font-weight: 600;
}
.dupe-opt-letter {
  font-weight: 700;
  font-size: 0.78rem;
  min-width: 16px;
}

/* ============================================
   WEEKLY EXAM HOME CARD
   ============================================ */
.weekly-card {
  border-color: #f59e0b !important;
  border-width: 2px;
}
.weekly-card .mock-exam-title {
  color: #f59e0b;
}

/* ============================================
   ANSWERS SCREEN
   ============================================ */
.answers-count {
  font-size: 0.82rem;
  color: var(--text-secondary);
}
.answers-intro {
  padding: 12px 16px;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.6;
  border-bottom: 1px solid var(--border);
}
.answers-round-grid {
  padding: 14px 16px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}
.answers-round-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 12px;
  cursor: pointer;
  text-align: center;
  transition: border-color 0.2s, transform 0.15s;
}
.answers-round-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.answers-round-card:active {
  transform: translateY(0);
}
.answers-round-card.weekly-exam {
  border-color: #f59e0b;
  border-width: 2px;
  background: linear-gradient(135deg, rgba(245,158,11,0.08), transparent);
  grid-column: 1 / -1;
}
.answers-round-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.weekly-exam .answers-round-name {
  color: #f59e0b;
}
.answers-round-sub {
  font-size: 0.72rem;
  color: var(--text-secondary);
}
.answers-question-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-bottom: 30px;
}
.answer-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  animation: fadeIn 0.25s ease;
}
.answer-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  margin-bottom: 10px;
  flex-shrink: 0;
}
.answer-passage {
  background: var(--bg-input);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 10px;
  border-left: 3px solid var(--accent);
}
.answer-question {
  font-size: 0.93rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 10px;
}
/* Answers toolbar toggle buttons */
.answers-toolbar {
  display: flex;
  gap: 10px;
  padding: 10px 16px;
  position: sticky;
  top: 44px;
  background: var(--bg-primary);
  z-index: 9;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.answers-start-quiz-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 14px;
  border-radius: 20px;
  border: 1.5px solid var(--success);
  background: rgba(34,197,94,0.1);
  color: var(--success);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
  margin-left: auto;
}
.answers-start-quiz-btn:hover {
  background: rgba(34,197,94,0.2);
}
.answers-detail {
  padding: 0;
}
.answers-detail .answers-question-list {
  padding: 12px 16px;
}
.answers-toggle-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 14px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  background: var(--card-bg);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  user-select: none;
}
.answers-toggle-btn.active {
  border-color: var(--accent);
  background: rgba(59,130,246,0.1);
  color: var(--accent);
}
.answers-toggle-btn:hover {
  border-color: var(--accent);
}
.toggle-icon {
  font-size: 0.9rem;
}
.answers-hint {
  text-align: center;
  padding: 10px 16px;
  font-size: 0.8rem;
  color: var(--text-muted, #999);
  background: rgba(59,130,246,0.04);
  border-bottom: 1px solid var(--border);
  animation: hintFadeIn 0.5s ease;
}
@keyframes hintFadeIn {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}
/* Hidden states for wrong answers and explanations */
.hide-wrong .answer-opt:not(.correct) {
  display: none;
}
.hide-explanations .answer-explanation {
  display: none;
}

.answer-options {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 10px;
}
.answer-opt {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  padding: 4px 0;
}
.answer-opt.correct {
  color: var(--success);
  font-weight: 600;
}
.answer-opt-letter {
  font-weight: 700;
  font-size: 0.78rem;
  min-width: 16px;
}
.answer-explanation {
  border-left: 3px solid var(--accent);
  background: rgba(59,130,246,0.06);
  border-radius: 0 8px 8px 0;
  padding: 10px 14px;
  font-size: 0.83rem;
  line-height: 1.65;
  color: var(--text-secondary);
}
.answer-explanation-label {
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: 4px;
}

/* ============================================
   SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-input);
  border-radius: 3px;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (min-width: 480px) {
  .rounds-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .option-btn {
    padding: 16px 20px;
  }

  .dict-alpha-bar {
    flex-wrap: wrap;
    justify-content: center;
    overflow-x: visible;
  }

  .alpha-btn {
    flex-shrink: 1;
  }
}

@media (min-width: 640px) {
  #app {
    padding: 0 24px;
  }

  .rounds-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
  }

  .home-header h1 {
    font-size: 2rem;
  }

  .question-text {
    font-size: 1.1rem;
  }

  .score-breakdown {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* ============================================
   期中考考區 / 武器題庫
   ============================================ */

/* Home section */
.midterm-section {
  margin: 20px 0 8px;
}

/* ---- Weapon Screen Layout ---- */
.weapon-tabs {
  display: flex;
  overflow-x: auto;
  gap: 6px;
  padding: 10px 16px 0;
  background: var(--bg-secondary);
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.weapon-tab {
  flex-shrink: 0;
  padding: 8px 14px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border-bottom: 3px solid transparent;
}
.weapon-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.weapon-panel {
  display: none;
  padding: 16px;
}
.weapon-panel.active {
  display: block;
}

/* ---- Vocab Controls ---- */
.vocab-controls {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.vocab-ctrl-btn {
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.vocab-ctrl-btn.active,
.vocab-ctrl-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ---- Flashcard ---- */
.vocab-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border);
  min-height: 180px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  padding: 24px 20px 16px;
  gap: 10px;
  transition: transform 0.15s, box-shadow 0.15s;
  position: relative;
  box-shadow: var(--shadow);
}
.vocab-card:active { transform: scale(0.97); }
.vocab-card-front {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.04em;
}
.vocab-card-back {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--success);
}
.vocab-card-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  position: absolute;
  bottom: 10px;
  right: 14px;
}
.vocab-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin: 14px 0 8px;
}
.vocab-nav-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  transition: var(--transition);
}
.vocab-nav-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.vocab-nav-count {
  font-size: 0.9rem;
  color: var(--text-secondary);
  min-width: 70px;
  text-align: center;
}
.vocab-shuffle-row {
  display: flex;
  justify-content: center;
  margin-top: 6px;
}

/* ---- Vocab Quiz ---- */
.vocab-quiz-prompt {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  margin: 16px 0 20px;
  letter-spacing: 0.04em;
}
.vocab-quiz-result {
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  margin: 10px 0;
}
.vocab-quiz-result.correct { background: var(--success-bg); color: var(--success); border: 1px solid var(--success-border); }
.vocab-quiz-result.wrong   { background: var(--danger-bg);  color: var(--danger);  border: 1px solid var(--danger-border); }
.vocab-quiz-score {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 8px;
}

/* ---- Vocab List ---- */
.vocab-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.vocab-table th {
  padding: 8px 12px;
  text-align: left;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-weight: 600;
  border-bottom: 1.5px solid var(--border);
}
.vocab-table td { padding: 8px 12px; border-bottom: 1px solid var(--border); }
.vocab-en { color: var(--accent); font-weight: 600; }
.vocab-zh { color: var(--text-primary); }

/* ---- Chapter Panel ---- */
.ch-panel-wrap { display: flex; flex-direction: column; gap: 20px; }
.ch-section {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 14px 16px;
}
.ch-section-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.ch-section-subtitle {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin: 18px 0 8px;
  padding: 4px 8px;
  border-left: 3px solid var(--accent);
}
.civil-chapter-header {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  background: var(--card-bg);
  border-radius: 8px;
  padding: 10px 14px;
  margin: 28px 0 10px;
  border-left: 4px solid var(--primary);
}

/* Civil chapter tabs */
.civil-chapter-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.civil-tab-btn {
  flex: 1;
  min-width: 70px;
  padding: 8px 12px;
  border: 2px solid var(--border);
  background: var(--card-bg);
  color: var(--text-muted);
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.civil-tab-btn.active {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}
.civil-tab-btn:not(.active):hover {
  border-color: var(--primary);
  color: var(--text);
}

/* ── Memory Mode ──────────────────────────────────── */
.memory-settings-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  padding: 12px 14px;
  background: var(--bg-secondary);
  border-radius: 14px;
  border: 1px solid var(--border);
}
.memory-settings-label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
/* Segmented control group */
.memory-time-group {
  display: flex;
  background: var(--bg-primary);
  border-radius: 22px;
  padding: 3px;
  gap: 2px;
}
.memory-time-btn {
  padding: 4px 11px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 18px;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, box-shadow 0.15s;
  white-space: nowrap;
}
.memory-time-btn:hover:not(.active) {
  color: var(--text-primary);
  background: rgba(255,255,255,0.06);
}
.memory-time-btn.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(59,130,246,0.4);
}
/* amem-time-btn mirrors memory-time-btn */
.amem-time-btn {
  padding: 4px 11px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 18px;
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, box-shadow 0.15s;
  white-space: nowrap;
}
.amem-time-btn:hover:not(.active) {
  color: var(--text-primary);
  background: rgba(255,255,255,0.06);
}
.amem-time-btn.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(59,130,246,0.4);
}
.memory-toggle-opt {
  margin-left: auto;
  font-size: 0.8rem !important;
  padding: 5px 12px !important;
}
/* Memory card */
.memory-card {
  background: var(--bg-secondary);
  border: 1px solid rgba(59,130,246,0.2);
  border-radius: 20px;
  padding: 22px 20px 14px;
  margin-bottom: 12px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.25);
}
.memory-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--success));
  border-radius: 20px 20px 0 0;
}
/* Progress row */
.memory-progress-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 18px;
}
.memory-progress-row span:first-child {
  font-size: 1rem;
  font-weight: 800;
  color: var(--accent);
}
.memory-progress-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}
.memory-q {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 18px;
}
.memory-opts {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
}
.memory-opt {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-radius: 10px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  font-size: 0.92rem;
  color: var(--text-secondary);
  transition: border-color 0.15s;
}
.memory-opt-correct {
  border-color: var(--success-border);
  background: var(--success-bg);
  color: var(--text-primary);
  font-weight: 600;
}
/* Timer bar */
.memory-timer-track {
  height: 5px;
  background: var(--bg-primary);
  border-radius: 5px;
  overflow: hidden;
  margin-top: 4px;
}
.memory-timer-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--success));
  border-radius: 5px;
  transition: background 0.5s;
}
/* Controls */
.memory-controls {
  display: flex;
  gap: 8px;
}
.memory-ctrl-btn {
  flex: 1;
  padding: 11px 8px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border-radius: 12px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.memory-ctrl-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(59,130,246,0.06);
}
.memory-next-btn {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.memory-next-btn:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}
/* Explanation */
.memory-expl {
  background: rgba(59,130,246,0.06);
  border: 1px solid rgba(59,130,246,0.15);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 14px;
}
.memory-expl-label {
  font-weight: 700;
  color: var(--accent);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 5px;
}

/* T/F Grid */
.tf-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}
.tf-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 8px 4px;
}
.tf-num {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
}
.tf-ans {
  font-size: 1.15rem;
  font-weight: 800;
}
.tf-o { color: var(--success); }
.tf-x { color: var(--danger); }

/* TF Q&A List (for chapters with question text) */
.tf-qa-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.tf-qa-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  line-height: 1.55;
}
.tf-qa-num {
  flex-shrink: 0;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  min-width: 22px;
  margin-top: 2px;
}
.tf-qa-q {
  flex: 1;
  font-size: 0.92rem;
  color: var(--text-primary);
}
.tf-ans-badge {
  flex-shrink: 0;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
  margin-top: 2px;
  white-space: nowrap;
}
.tf-ans-badge.tf-o {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid var(--success-border);
}
.tf-ans-badge.tf-x {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger-border);
}
.tf-qa-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.tf-qa-note {
  font-size: 0.82rem;
  color: var(--danger);
  opacity: 0.85;
  padding-left: 4px;
  line-height: 1.4;
}
.tf-qa-note::before {
  content: '\2192  ';
}
/* SA always-open styles */
.sa-q-open {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent);
  margin-bottom: 6px;
  line-height: 1.5;
}
.sa-a-open {
  display: block !important;
  white-space: pre-line;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-primary);
  background: var(--bg-input);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}

/* MC Review (Q+A with correct option highlighted) */
.mc-review-item {
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin-bottom: 10px;
}
.mc-review-qnum {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 4px;
}
.mc-review-q {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.5;
}
.mc-review-opts {
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.mc-review-opt {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-secondary);
  background: var(--bg-input);
}
.mc-review-opt.mc-review-correct {
  background: var(--success-bg);
  color: var(--success);
  font-weight: 700;
  border: 1px solid var(--success-border);
}
.mc-review-letter {
  flex-shrink: 0;
  font-weight: 800;
  font-size: 0.82rem;
  min-width: 18px;
}
.mc-review-tick {
  margin-left: auto;
  font-size: 1rem;
}

/* MC Key Grid */
.mc-mode-row {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}
.mc-mode-btn {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.mc-mode-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.mc-key-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}
.mc-key-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 8px 4px;
}
.mc-num { font-size: 0.72rem; color: var(--text-muted); font-weight: 600; }
.mc-ans-badge {
  font-size: 1.1rem;
  font-weight: 800;
}
.mc-ans-a { color: #60a5fa; }
.mc-ans-b { color: #34d399; }
.mc-ans-c { color: #f59e0b; }
.mc-ans-d { color: #f87171; }

/* MC Quiz */
.mc-quiz-score-row {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}
.mc-quiz-question {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  line-height: 1.5;
}
.mc-quiz-done {
  text-align: center;
  padding: 20px 0;
}
.mc-done-score {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
}
.mc-done-pct {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}
.mc-quiz-restart { margin-top: 16px; }

/* ---- wrong-review section ---- */
.wrong-review {
  text-align: left;
  margin: 18px 0 12px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.wrong-review-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: #f87171;
  margin-bottom: 10px;
}
.wrong-review-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 8px;
}
.wrong-review-q {
  font-size: 0.87rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
  line-height: 1.45;
}
.wrong-review-ans {
  font-size: 0.83rem;
  line-height: 1.6;
}
.wr-your {
  color: #f87171;
}
.wr-arrow {
  color: var(--text-muted);
}
.wr-correct {
  color: #4ade80;
  font-weight: 600;
}
.wrong-review-none {
  font-size: 1rem;
  color: #4ade80;
  font-weight: 600;
  padding: 10px 0;
}

/* Chapter toolbar (toggle buttons) */
.ch-toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg-primary);
  padding: 8px 0;
  margin-bottom: 8px;
}

/* Hide wrong options mode */
.hide-wrong-opts .mc-review-opt:not(.mc-review-correct) {
  display: none;
}

/* Quiz section at bottom */
.ch-quiz-section {
  margin-top: 20px;
  border-top: 2px solid var(--border);
  padding-top: 16px;
}
.quiz-start-btn {
  display: block;
  width: 100%;
  padding: 12px;
  margin: 8px 0;
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  background: transparent;
  color: var(--accent);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.quiz-start-btn:hover {
  background: var(--accent);
  color: #fff;
}
.tf-quiz-opts {
  display: flex;
  gap: 12px;
}
.tf-quiz-opts .option-btn {
  flex: 1;
  font-size: 1.1rem;
  padding: 16px;
}

/* SA items */
.sa-item {
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}
.sa-item:last-child { border-bottom: none; }
.sa-q {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  gap: 8px;
  align-items: flex-start;
  user-select: none;
}
.sa-q:hover { color: var(--accent); }
.sa-arrow { font-size: 0.75rem; margin-top: 2px; flex-shrink: 0; }
.sa-a {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  padding: 10px 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  margin-top: 8px;
  border-left: 3px solid var(--accent);
  white-space: pre-wrap;
}

/* --- China Studies --- */
.china-fill-item { margin-bottom: 12px; }
.china-fill-answer { margin-top: 4px; }
.china-ref { color: var(--text-dim); font-size: 0.85em; }

/* Toolbar quiz button (right-aligned next to toggle) */
.toolbar-quiz-btn {
  margin: 0 !important;
  padding: 6px 14px !important;
  font-size: 0.85rem !important;
  border-radius: 8px !important;
  background: var(--accent) !important;
  color: #fff !important;
  border: none !important;
  cursor: pointer;
  white-space: nowrap;
  margin-left: auto !important;
}
.toolbar-quiz-btn:hover { opacity: 0.85; }

/* Fill quiz blanks */
.fill-blank { display: inline; padding: 2px 6px; border-radius: 4px; background: var(--bg-secondary); border: 1px dashed var(--border); margin: 0 2px; font-weight: 600; }
.fill-active { background: var(--accent); color: #fff; border-style: solid; animation: pulse-blank 1s infinite; }
.fill-correct { background: rgba(34,197,94,0.2); color: #22c55e; border-color: #22c55e; border-style: solid; }
.fill-wrong { background: rgba(239,68,68,0.2); color: #ef4444; border-color: #ef4444; border-style: solid; text-decoration: line-through; }
.fill-hint { color: var(--text-dim); font-size: 0.9rem; margin: 8px 0; }
.fill-quiz-question { line-height: 2; }
.fill-answer-inline { color: #22c55e; font-weight: 700; border-bottom: 2px solid #22c55e; padding: 0 2px; margin: 0 1px; }

@keyframes pulse-blank {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* --- SA/QA Multi-select quiz --- */
.sa-multi-hint { font-size: 0.9rem; color: var(--text-secondary); margin: 8px 0 12px; }
.sa-multi-opts { display: flex; flex-direction: column; gap: 8px; }
.sa-multi-btn { text-align: left !important; white-space: normal !important; line-height: 1.4; min-height: 44px; }
.sa-multi-btn.sa-selected { border-color: var(--accent) !important; background: rgba(59,130,246,0.15) !important; color: #fff; }
.sa-submit-btn { margin-top: 12px; width: 100%; }
.sa-quiz-answer-reveal { margin-top: 16px; padding: 12px 16px; background: var(--bg-secondary); border-left: 3px solid var(--accent); border-radius: 8px; font-size: 0.95rem; line-height: 1.6; }
.sa-multi-quiz .next-btn { margin-top: 12px; }

/* ---- Weapon memory sub-type tabs ---- */
.wm-type-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 4px;
}
.wm-type-btn {
  flex: 1;
  padding: 8px 6px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.wm-type-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.wm-type-btn:hover:not(.active) {
  border-color: var(--accent);
  color: var(--accent);
}
.wm-sa-answer {
  white-space: pre-line;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border-radius: 8px;
  padding: 12px 14px;
  max-height: 320px;
  overflow-y: auto;
  border-left: 3px solid var(--accent);
}
.wm-tf-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-style: italic;
  line-height: 1.5;
}

/* ---- Chapter view-mode tab bar ---- */
.ch-view-tabs {
  display: flex;
  gap: 8px;
  padding: 4px 0 4px;
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
}
.ch-view-btn {
  flex: 1;
  padding: 9px 8px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}
.ch-view-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.ch-view-btn:hover:not(.active) {
  border-color: var(--accent);
  color: var(--accent);
}
.ch-view {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Light mode tweaks */
.light .vocab-card { background: #fff; }
.light .ch-section { background: #fff; }
.light .tf-cell, .light .mc-key-cell { background: #f1f5f9; }
.light .sa-a { background: #f1f5f9; }


/* ============================================
   CHINA MEMORY MODE
   ============================================ */
.china-mem-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 16px 0 24px;
}
.china-mem-prog {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.china-mem-card {
  width: 100%;
  max-width: 600px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  min-height: 100px;
}
.china-mem-front {
  font-size: 1.05rem;
  color: var(--text);
  line-height: 1.6;
}
.china-mem-back {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
  font-size: 0.97rem;
  color: #4ade80;
  line-height: 1.7;
}
.china-mem-nav {
  display: flex;
  gap: 12px;
}
.china-mem-timer-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.china-mem-timer-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* China QA wrong review */
.wrong-review-section {
  text-align: left;
  width: 100%;
  max-width: 560px;
  margin: 16px auto 0;
}
.wrong-review-title {
  font-size: 1rem;
  font-weight: 700;
  color: #f87171;
  margin-bottom: 10px;
}
.wrong-review-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 10px;
}
.wrong-review-q {
  font-size: 0.95rem;
  color: var(--text);
  margin-bottom: 6px;
}
.wrong-review-a {
  font-size: 0.88rem;
  color: #4ade80;
  line-height: 1.6;
}