/* ==========================================================================
   ÔN THI 600 CÂU HỎI SÁT HẠCH LÁI XE Ô TÔ - STYLESHEET
   Design System: Editorial, Minimal, Fast, High Contrast Accessible UI
   ========================================================================== */

:root {
  /* Eye-Comfort Warm Paper Palette */
  --bg: #FAF7F2;
  --bg-subtle: #F4EFEA;
  --surface: #FFFFFF;
  --surface-hover: #F8F4EE;
  --border: #E6DED5;
  --border-strong: #D5C9BC;
  
  /* Typography */
  --text-main: #231F1A;
  --text-muted: #6B6258;
  --text-light: #948B7E;
  
  /* Brand Accents */
  --primary: #BA4A1B;
  --primary-hover: #9E3D14;
  --primary-light: #FBF0EB;
  --primary-glow: rgba(186, 74, 27, 0.2);
  
  /* Safety & Exam Status */
  --success: #15803D;
  --success-bg: #DCFCE7;
  --success-border: #86EFAC;
  
  --danger: #DC2626;
  --danger-bg: #FEE2E2;
  --danger-border: #FCA5A5;
  
  --warning: #D97706;
  --warning-bg: #FEF3C7;
  --warning-border: #FCD34D;
  
  --info: #2563EB;
  --info-bg: #DBEAFE;
  --info-border: #93C5FD;
  
  /* Layout & Shadows */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-sm: 0 1px 3px rgba(35, 31, 26, 0.05);
  --shadow-md: 0 4px 12px rgba(35, 31, 26, 0.08);
  --shadow-lg: 0 10px 25px rgba(35, 31, 26, 0.1);
  --shadow-card: 0 8px 30px rgba(35, 31, 26, 0.06);
  
  --font-sans: 'DM Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-display: 'Fraunces', Georgia, serif;
  --font-mono: 'JetBrains Mono', monospace;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg: #141210;
  --bg-subtle: #1C1916;
  --surface: #221F1C;
  --surface-hover: #2B2622;
  --border: #36302A;
  --border-strong: #4A423B;
  
  --text-main: #F4EFEA;
  --text-muted: #A3998E;
  --text-light: #70685F;
  
  --primary: #E06937;
  --primary-hover: #F27B49;
  --primary-light: rgba(224, 105, 55, 0.15);
  --primary-glow: rgba(224, 105, 55, 0.3);
  
  --success: #22C55E;
  --success-bg: rgba(34, 197, 94, 0.15);
  --success-border: #166534;
  
  --danger: #EF4444;
  --danger-bg: rgba(239, 68, 68, 0.15);
  --danger-border: #991B1B;
  
  --warning: #F59E0B;
  --warning-bg: rgba(245, 158, 11, 0.15);
  --warning-border: #92400E;
  
  --info: #3B82F6;
  --info-bg: rgba(59, 130, 246, 0.15);
  --info-border: #1E40AF;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
  --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.4);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.app-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 1rem;
}

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.back-home-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: var(--transition);
}

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

.app-brand {
  display: flex;
  flex-direction: column;
}

.app-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.app-title .badge-pill {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(186, 74, 27, 0.2);
}

.app-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Navigation Mode Switcher */
.mode-nav {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background-color: var(--bg-subtle);
  padding: 0.3rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.mode-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.mode-tab-btn:hover {
  color: var(--text-main);
}

.mode-tab-btn.active {
  background-color: var(--surface);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.mode-badge {
  font-size: 0.7rem;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: var(--border);
  color: var(--text-main);
}

.mode-tab-btn.active .mode-badge {
  background: var(--primary);
  color: #FFFFFF;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-btn-toggle {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.theme-btn-toggle:hover {
  background: var(--surface-hover);
  border-color: var(--text-muted);
}

/* Main Content Views */
.view-panel {
  display: none;
  padding: 1.5rem 0 3rem;
}

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

/* Sub-header Filter Bar */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.chapter-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  min-width: 250px;
}

.chapter-selector label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.custom-select {
  width: 100%;
  max-width: 380px;
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
  color: var(--text-main);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  cursor: pointer;
  transition: var(--transition);
}

.custom-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.quick-stats-pills {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.stat-pill {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  background: var(--bg-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.stat-pill strong {
  color: var(--text-main);
  font-weight: 700;
}

/* ==========================================================================
   CHẾ ĐỘ 1: FLASHCARD 3D
   ========================================================================== */
.flashcard-wrapper {
  max-width: 760px;
  margin: 0 auto;
}

.card-progress-bar {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 999px;
  margin-bottom: 1.25rem;
  overflow: hidden;
}

.card-progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 999px;
  transition: width 0.3s ease;
}

/* Flashcard Container (Tự co giãn, không cuộn, không bị lật ngược chữ) */
.flashcard-container {
  width: 100%;
  margin-bottom: 1.5rem;
}

.card-side {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  animation: cardFlipIn 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes cardFlipIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card-bottom-action-bar {
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
}

.flip-btn-main {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  max-width: 480px;
  height: 48px;
  font-size: 0.95rem;
  font-weight: 700;
  color: #FFFFFF;
  background: var(--primary);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 2px 8px var(--primary-glow);
}

.flip-btn-main:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.flip-btn-back {
  background: var(--bg-subtle);
  color: var(--text-main);
  border: 1.5px solid var(--border-strong);
  box-shadow: var(--shadow-sm);
}

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

/* Card Header */
.card-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tag-cluster {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge-q-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text-main);
  border: 1px solid var(--border);
  white-space: nowrap;
}

.badge-chapter {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--info-bg);
  color: var(--info);
  border: 1px solid var(--info-border);
  white-space: nowrap;
}

.badge-critical {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger-border);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  white-space: nowrap;
  animation: pulse-danger 2s infinite;
}

@keyframes pulse-danger {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}

.bookmark-btn {
  background: transparent;
  border: 1px solid var(--border);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
}

.bookmark-btn:hover, .bookmark-btn.active {
  color: var(--warning);
  border-color: var(--warning);
  background: var(--warning-bg);
}

/* Card Content */
.card-question-text {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

.card-media-box {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1rem;
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  margin-bottom: 1.25rem;
}

.card-media-box svg {
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.08));
}

.card-media-box img,
.question-img {
  max-width: 100%;
  max-height: 290px;
  object-fit: contain;
  border-radius: var(--radius-sm);
  filter: drop-shadow(0 2px 6px rgba(0,0,0,0.08));
  transition: transform 0.2s ease;
}

.card-media-box img:hover {
  transform: scale(1.02);
}

/* Options on Front */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1.5rem;
}

.option-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-main);
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  width: 100%;
}

.option-item:hover {
  background: var(--surface-hover);
  border-color: var(--border-strong);
}

.option-item.selected {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

.option-item.correct {
  border-color: var(--success) !important;
  background: var(--success-bg) !important;
  color: var(--success) !important;
  font-weight: 600;
}

.option-item.incorrect {
  border-color: var(--danger) !important;
  background: var(--danger-bg) !important;
  color: var(--danger) !important;
}

.option-index {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 999px;
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
}

.option-item.selected .option-index {
  background: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
}

.option-item.correct .option-index {
  background: var(--success);
  color: #FFFFFF;
  border-color: var(--success);
}

.option-item.incorrect .option-index {
  background: var(--danger);
  color: #FFFFFF;
  border-color: var(--danger);
}

.option-text {
  flex: 1;
}

/* Card Back Design */
.answer-highlight-box {
  padding: 1rem 1.25rem;
  background: var(--success-bg);
  border: 1.5px solid var(--success-border);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
}

.answer-label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--success);
  margin-bottom: 0.35rem;
}

.answer-text {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.5;
}

.explanation-section {
  background: var(--bg-subtle);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  border: 1px solid var(--border);
  margin-bottom: 1rem;
}

.section-title-sm {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.explanation-text {
  font-size: 0.925rem;
  color: var(--text-main);
  line-height: 1.6;
}

.tip-box {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: var(--radius-md);
  padding: 0.9rem 1.15rem;
  margin-bottom: 1.5rem;
}

.tip-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--warning);
  margin-bottom: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.tip-text {
  font-size: 0.9rem;
  color: var(--text-main);
  font-weight: 500;
}

/* Flashcard Navigation Footer */
.flashcard-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.btn-ctrl {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-main);
  cursor: pointer;
  transition: var(--transition);
}

.btn-ctrl:hover:not(:disabled) {
  background: var(--surface-hover);
  border-color: var(--text-muted);
}

.btn-ctrl:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-ctrl.btn-primary {
  background: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
}

.btn-ctrl.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.nav-counter {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.keyboard-hints {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-light);
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.keyboard-hints kbd {
  display: inline-block;
  padding: 0.15rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 1px 1px rgba(0,0,0,0.1);
  color: var(--text-muted);
}

/* ==========================================================================
   CHẾ ĐỘ 2: THI THỬ 30 CÂU (EXAM MODE)
   ========================================================================== */
.exam-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.5rem;
  align-items: start;
}

/* Sticky Exam Header Bar */
.exam-control-bar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.exam-select-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.timer-box {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.15rem;
  background: var(--bg-subtle);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.05em;
  transition: var(--transition);
}

.timer-box.warning {
  border-color: var(--danger);
  color: var(--danger);
  background: var(--danger-bg);
  animation: pulse-timer 1s infinite alternate;
}

@keyframes pulse-timer {
  0% { transform: scale(1); }
  100% { transform: scale(1.04); }
}

.btn-submit-exam {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.35rem;
  background: var(--primary);
  color: #FFFFFF;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}

.btn-submit-exam:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-start-exam {
  background: var(--primary);
  box-shadow: 0 2px 8px var(--primary-glow);
}

.btn-start-exam:hover {
  background: var(--primary-hover);
}

/* ==========================================================================
   MODERN TOGGLE SWITCH & INSTANT FEEDBACK CONTROLS
   ========================================================================== */
.switch-toggle {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
  cursor: pointer;
}

.switch-toggle .switch-input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.switch-slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background-color: var(--border-strong);
  transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 999px;
  border: 1.5px solid var(--border);
}

.switch-slider::before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 2.5px;
  bottom: 2.5px;
  background-color: #FFFFFF;
  transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 50%;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

.switch-toggle .switch-input:checked + .switch-slider {
  background-color: var(--primary);
  border-color: var(--primary);
}

.switch-toggle .switch-input:focus-visible + .switch-slider {
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.switch-toggle .switch-input:checked + .switch-slider::before {
  transform: translateX(18px);
}

/* Switch Sizes */
.switch-toggle.switch-lg {
  width: 52px;
  height: 28px;
}
.switch-toggle.switch-lg .switch-slider::before {
  height: 20px;
  width: 20px;
  left: 2.5px;
  bottom: 2.5px;
}
.switch-toggle.switch-lg .switch-input:checked + .switch-slider::before {
  transform: translateX(22px);
}

.switch-toggle.switch-sm {
  width: 38px;
  height: 22px;
}
.switch-toggle.switch-sm .switch-slider::before {
  height: 14px;
  width: 14px;
  left: 2.5px;
  bottom: 2.5px;
}
.switch-toggle.switch-sm .switch-input:checked + .switch-slider::before {
  transform: translateX(15px);
}

/* Top Bar Toggle Item */
.exam-toggle-bar-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  background: var(--bg-subtle);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  user-select: none;
  transition: var(--transition);
}

.exam-toggle-bar-item:hover {
  border-color: var(--primary);
  background: var(--surface-hover);
}

.exam-toggle-icon {
  font-size: 1rem;
}

.exam-toggle-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  white-space: nowrap;
}

.switch-status-tag {
  font-size: 0.725rem;
  font-weight: 800;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.switch-status-tag.on {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid var(--success-border);
}

.switch-status-tag.off {
  background: var(--bg-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

/* Ready Feature Card (Briefing screen) */
.ready-feature-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  background: var(--surface);
  border: 2px solid var(--primary);
  box-shadow: 0 4px 16px var(--primary-glow);
  border-radius: var(--radius-lg);
  padding: 1.15rem 1.35rem;
  margin-bottom: 1.75rem;
  text-align: left;
  transition: var(--transition);
}

.ready-feature-card.is-off {
  border-color: var(--border-strong);
  box-shadow: none;
}

.ready-feature-left {
  flex: 1;
}

.ready-feature-badge-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.4rem;
}

.ready-feature-badge {
  font-size: 0.7rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  background: var(--primary-light);
  color: var(--primary);
}

.ready-feature-status-pill {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  transition: var(--transition);
}

.ready-feature-status-pill.on {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid var(--success-border);
}

.ready-feature-status-pill.off {
  background: var(--bg-subtle);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.ready-feature-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 1rem;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.ready-feature-icon {
  font-size: 1.1rem;
}

.ready-feature-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

.ready-feature-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* Sidebar Mode Row */
.sidebar-mode-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
  user-select: none;
  transition: var(--transition);
}

.sidebar-mode-row:hover {
  border-color: var(--primary);
}

.sidebar-mode-label-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sidebar-mode-icon {
  font-size: 1.1rem;
}

.sidebar-mode-texts {
  display: flex;
  flex-direction: column;
}

.sidebar-mode-name {
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--text-main);
}

.sidebar-mode-sub {
  font-size: 0.725rem;
  font-weight: 600;
  color: var(--success);
  transition: var(--transition);
}

.sidebar-mode-sub.off {
  color: var(--text-muted);
}

/* Action chip in Question Header */
.instant-action-chip {
  cursor: pointer;
  user-select: none;
  display: inline-flex;
  position: relative;
}

.chip-input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.chip-visual {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: var(--transition);
}

.chip-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border-strong);
  transition: var(--transition);
}

.instant-action-chip:hover .chip-visual {
  border-color: var(--primary);
  color: var(--text-main);
}

.instant-action-chip input:checked + .chip-visual {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

.instant-action-chip input:checked + .chip-visual .chip-dot {
  background: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

/* Exam Header Actions (Peek Button & Flag) */
.exam-header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-peek-answer {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.btn-peek-answer:hover {
  background: var(--warning-bg);
  border-color: var(--warning);
  color: var(--warning);
}

/* Exam Ready Briefing Card (Before Start) */
.exam-ready-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-card);
  text-align: center;
}

/* Ready Pill Badge */
.ready-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  background: var(--primary-light);
  border: 1px solid var(--primary-glow);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 1rem;
}

.ready-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.ready-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 1.75rem;
}

/* Ready Specs Metric Grid - Swiss Minimalist High-Contrast */
.ready-specs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.75rem;
  text-align: left;
}

.ready-spec-item {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.15rem 1.35rem;
  background: var(--bg-subtle);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.ready-spec-item:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.ready-spec-item.pass {
  border-left: 4px solid var(--success);
}

.ready-spec-item.danger {
  border-left: 4px solid var(--danger);
}

[data-theme="dark"] .ready-spec-item {
  background: var(--surface);
  border-color: var(--border);
}

.ready-spec-info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.ready-spec-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.ready-spec-val {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 1.65rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.2;
}

.ready-spec-val .unit {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.ready-spec-val.pass {
  color: var(--success);
}

.ready-spec-val.danger {
  color: var(--danger);
}

.ready-spec-sub {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 0.15rem;
}

.ready-notes-box {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-left: 4px solid var(--warning);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.35rem;
  text-align: left;
  font-size: 0.875rem;
  color: var(--text-main);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.ready-notes-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--warning);
  margin-bottom: 0.35rem;
}

.ready-notes-box ul {
  margin-top: 0.5rem;
  padding-left: 1.25rem;
}

.ready-notes-box li {
  margin-bottom: 0.35rem;
}

.btn-start-hero {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  width: 100%;
  max-width: 440px;
  padding: 0.95rem 2rem;
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  border-radius: var(--radius-lg);
  border: none;
  background: var(--primary);
  color: #FFFFFF;
  cursor: pointer;
  box-shadow: 0 4px 14px var(--primary-glow);
  transition: var(--transition);
}

.btn-start-hero:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--primary-glow);
}

@media (max-width: 640px) {
  .ready-specs-grid {
    grid-template-columns: 1fr;
  }
}

/* Exam Question Panel */
.exam-main-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-card);
}

.exam-q-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  gap: 0.5rem;
}

.flag-label {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-subtle);
  transition: var(--transition);
}

.flag-label:hover {
  border-color: var(--warning);
  color: var(--warning);
}

.flag-label.active {
  background: var(--warning-bg);
  border-color: var(--warning);
  color: var(--warning);
}

.flag-checkbox {
  accent-color: var(--warning);
  cursor: pointer;
}

.exam-nav-btns {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

/* 30-Question Matrix Palette */
.exam-palette-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  position: sticky;
  top: 80px;
}

.palette-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.palette-tile {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--border);
  background: var(--bg-subtle);
  color: var(--text-muted);
  cursor: pointer;
  position: relative;
  transition: var(--transition);
}

.palette-tile:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.palette-tile.current {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
  color: var(--primary);
  font-weight: 800;
}

.palette-tile.answered {
  background: var(--primary);
  color: #FFFFFF;
  border-color: var(--primary);
}

.palette-tile.flagged::after {
  content: "";
  position: absolute;
  top: 3px;
  right: 3px;
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--warning);
}

.palette-tile.correct-result {
  background: var(--success) !important;
  color: #FFFFFF !important;
  border-color: var(--success) !important;
}

.palette-tile.incorrect-result {
  background: var(--danger) !important;
  color: #FFFFFF !important;
  border-color: var(--danger) !important;
}

/* Palette Legend */
.palette-legend {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.legend-swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.legend-swatch.unanswered { background: var(--bg-subtle); }
.legend-swatch.answered { background: var(--primary); }
.legend-swatch.flagged { background: var(--warning); }
.legend-swatch.correct, .legend-swatch.correct-result { background: var(--success); }
.legend-swatch.incorrect, .legend-swatch.incorrect-result { background: var(--danger); }

/* ==========================================================================
   RESULT MODAL & DIALOGS
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 18, 16, 0.7);
  backdrop-filter: blur(6px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

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

.modal-card {
  width: 100%;
  max-width: 580px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  box-shadow: var(--shadow-lg);
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
  text-align: center;
  animation: modal-pop 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modal-pop {
  0% { transform: scale(0.95); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.result-badge-icon {
  width: 72px;
  height: 72px;
  border-radius: 999px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
}

.result-badge-icon.pass {
  background: var(--success-bg);
  color: var(--success);
  border: 2px solid var(--success-border);
}

.result-badge-icon.fail {
  background: var(--danger-bg);
  color: var(--danger);
  border: 2px solid var(--danger-border);
}

.result-verdict {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.result-verdict.pass { color: var(--success); }
.result-verdict.fail { color: var(--danger); }

.result-score-display {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.result-score-display span {
  font-size: 1.25rem;
  color: var(--text-muted);
}

.critical-failure-alert {
  background: var(--danger-bg);
  border: 1.5px solid var(--danger-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  color: var(--danger);
  font-size: 0.95rem;
  font-weight: 600;
  margin: 1.25rem 0;
  text-align: left;
  line-height: 1.5;
}

.result-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.result-stat-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.75rem 0.5rem;
}

.stat-box-val {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.stat-box-val.correct { color: var(--success); }
.stat-box-val.wrong { color: var(--danger); }

.stat-box-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.modal-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn-modal {
  width: 100%;
  padding: 0.8rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}

.btn-modal.primary {
  background: var(--primary);
  color: #FFFFFF;
}

.btn-modal.primary:hover {
  background: var(--primary-hover);
}

.btn-modal.secondary {
  background: var(--surface);
  color: var(--text-main);
  border-color: var(--border);
}

.btn-modal.secondary:hover {
  background: var(--surface-hover);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-main);
  box-shadow: var(--shadow-lg);
  font-size: 0.875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: toast-in 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes toast-in {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Empty States */
.empty-state-box {
  text-align: center;
  padding: 3rem 1.5rem;
  background: var(--surface);
  border-radius: var(--radius-xl);
  border: 1px dashed var(--border);
  max-width: 500px;
  margin: 2rem auto;
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.8;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.empty-state-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

/* Responsive Media Queries */
@media (max-width: 900px) {
  .exam-layout {
    grid-template-columns: 1fr;
  }
  
  .exam-palette-card {
    position: static;
    order: 2; /* Crucial: Question card first, 30 palette below */
  }
  
  .palette-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

@media (max-width: 640px) {
  /* 1. Global Page Margins */
  .app-container {
    padding: 0 0.85rem;
  }

  /* 2. Top Header Navigation (Two balanced rows) */
  .header-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "brand actions"
      "nav nav";
    gap: 0.65rem 0;
    height: auto;
    padding: 0.65rem 0;
    align-items: center;
  }

  .brand-wrapper {
    grid-area: brand;
  }

  .header-actions {
    grid-area: actions;
    justify-self: end;
  }

  .mode-nav {
    grid-area: nav;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 0.25rem;
    gap: 0.25rem;
  }

  .mode-nav::-webkit-scrollbar {
    display: none;
  }

  .mode-tab-btn {
    white-space: nowrap;
    padding: 0.45rem 0.75rem;
    font-size: 0.8rem;
    flex-shrink: 0;
  }

  /* 3. Exam Control Bar on Mobile */
  .exam-control-bar {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding: 0.85rem;
    margin-bottom: 1rem;
  }

  .exam-select-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
  }

  .exam-select-group select {
    flex: 1;
    max-width: none !important;
    min-width: 0;
    font-size: 0.85rem;
    padding: 0.45rem 0.6rem;
  }

  .exam-select-group .btn-ctrl {
    white-space: nowrap;
    flex-shrink: 0;
  }

  .timer-box {
    justify-content: center;
    padding: 0.45rem 0.75rem;
    font-size: 1.15rem;
  }

  .exam-toggle-bar-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.45rem 0.75rem;
  }

  .btn-submit-exam, .btn-start-exam {
    width: 100%;
    justify-content: center;
    padding: 0.85rem 1rem;
    font-size: 1rem;
  }

  /* 4. Ready Briefing Card on Mobile */
  .exam-ready-card {
    padding: 1.5rem 1rem;
    border-radius: var(--radius-lg);
  }

  .ready-title {
    font-size: 1.25rem;
  }

  .ready-subtitle {
    font-size: 0.85rem;
    margin-bottom: 1.25rem;
  }

  .ready-specs-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
  }

  .ready-spec-item {
    padding: 0.85rem 1rem;
  }

  .ready-spec-val {
    font-size: 1.45rem;
  }

  .ready-notes-box {
    padding: 1rem;
    font-size: 0.825rem;
    margin-bottom: 1.25rem;
  }

  .ready-notes-box ul {
    padding-left: 1rem;
  }

  .ready-feature-card {
    flex-direction: column;
    align-items: stretch;
    gap: 0.85rem;
    padding: 1rem;
    margin-bottom: 1.25rem;
  }

  .ready-feature-title {
    font-size: 0.925rem;
  }

  .ready-feature-desc {
    font-size: 0.8rem;
  }

  .ready-feature-right {
    width: 100%;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding-top: 0.65rem;
    border-top: 1px solid var(--border);
  }

  .btn-start-hero {
    max-width: 100%;
    padding: 0.85rem 1.25rem;
    font-size: 1rem;
  }

  /* 5. Active Question Card on Mobile (NO SQUISHING OF PILLS!) */
  .exam-main-card {
    padding: 1rem;
    border-radius: var(--radius-lg);
  }

  .exam-q-header {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
    margin-bottom: 1rem;
  }

  .tag-cluster {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-wrap: wrap;
    width: 100%;
  }

  .badge-q-number,
  .badge-chapter,
  .badge-critical {
    white-space: nowrap;
    font-size: 0.75rem;
    padding: 0.25rem 0.55rem;
  }

  .exam-header-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.4rem;
    width: 100%;
    padding-top: 0.5rem;
    border-top: 1px dashed var(--border);
  }

  .instant-action-chip {
    flex: 1;
  }

  .instant-action-chip .chip-visual {
    width: 100%;
    justify-content: center;
    white-space: nowrap;
    font-size: 0.75rem;
    padding: 0.35rem 0.45rem;
  }

  .btn-peek-answer {
    flex: 1;
    justify-content: center;
    white-space: nowrap;
    font-size: 0.75rem;
    padding: 0.35rem 0.45rem;
  }

  .flag-label {
    flex: 1;
    justify-content: center;
    white-space: nowrap;
    font-size: 0.75rem;
    padding: 0.35rem 0.45rem;
  }

  .card-question-text {
    font-size: 1.05rem;
    line-height: 1.5;
    margin-bottom: 1rem;
  }

  .option-item {
    padding: 0.75rem 0.85rem;
    gap: 0.65rem;
    font-size: 0.9rem;
    min-height: 48px;
  }

  .option-index {
    width: 26px;
    height: 26px;
    font-size: 0.825rem;
  }

  .exam-nav-btns {
    margin-top: 1.25rem;
    padding-top: 1rem;
    gap: 0.75rem;
  }

  .exam-nav-btns .btn-ctrl {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    justify-content: center;
  }

  /* 6. 30-Question Palette on Mobile */
  .exam-palette-card {
    position: static;
    order: 2; /* Below the question card! */
    padding: 1rem;
    border-radius: var(--radius-lg);
    box-sizing: border-box;
    width: 100%;
    margin-top: 1rem;
  }

  .palette-title {
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
  }

  .sidebar-mode-row {
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.75rem;
  }

  .palette-grid {
    grid-template-columns: repeat(5, 1fr); /* 5 columns = 6 clean rows, never cut off! */
    gap: 0.4rem;
    width: 100%;
    box-sizing: border-box;
    margin-bottom: 1rem;
  }

  .palette-tile {
    aspect-ratio: 1;
    font-size: 0.85rem;
    min-height: 38px;
  }

  .palette-legend {
    padding-top: 0.75rem;
    gap: 0.4rem;
    font-size: 0.75rem;
  }

  /* 7. Flashcard View Mobile */
  .card-face {
    padding: 1.25rem 1rem;
  }

  .flashcard-nav-bar {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .flashcard-nav-bar .btn-ctrl {
    flex: 1;
    min-width: 110px;
    justify-content: center;
    padding: 0.65rem 0.75rem;
    font-size: 0.85rem;
  }

  .nav-counter {
    order: -1;
    width: 100%;
    text-align: center;
    font-size: 0.85rem;
    margin-bottom: 0.25rem;
  }

  .keyboard-hints {
    display: none;
  }

  /* 8. Result Modal on Mobile */
  .modal-overlay {
    padding: 0.75rem;
  }

  .modal-card {
    padding: 1.5rem 1rem;
    max-height: 90vh;
    overflow-y: auto;
  }

  .result-score-display {
    font-size: 2.75rem;
  }

  .result-stats-grid {
    gap: 0.5rem;
  }

  .result-stat-box {
    padding: 0.65rem 0.5rem;
  }

  .stat-box-val {
    font-size: 1.35rem;
  }

  .stat-box-label {
    font-size: 0.725rem;
  }

  .modal-actions {
    flex-direction: column;
    gap: 0.5rem;
  }

  .btn-modal {
    width: 100%;
    justify-content: center;
  }
}