/* ==========================================================================
   DARK MINIMALIST MOCK TEST PLATFORM - DESIGN SYSTEM & STYLES
   ========================================================================== */

:root {
  /* Color Palette - Dark Minimalist */
  --bg-base: #090a0f;
  --bg-surface: #11141d;
  --bg-surface-elevated: #181c28;
  --bg-surface-hover: #202637;
  --bg-surface-active: #283045;
  
  --border-subtle: #1f2536;
  --border-default: #2d354d;
  --border-focus: #38bdf8;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-disabled: #475569;
  
  /* Accent & Status Colors */
  --accent-primary: #38bdf8;
  --accent-primary-hover: #0ea5e9;
  --accent-primary-glow: rgba(56, 189, 248, 0.15);
  
  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.12);
  --color-success-border: rgba(16, 185, 129, 0.35);
  
  --color-danger: #f43f5e;
  --color-danger-bg: rgba(244, 63, 94, 0.12);
  --color-danger-border: rgba(244, 63, 94, 0.35);
  
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.12);
  --color-warning-border: rgba(245, 158, 11, 0.35);
  
  --color-purple: #a855f7;
  --color-purple-bg: rgba(168, 85, 247, 0.12);
  --color-purple-border: rgba(168, 85, 247, 0.35);

  --color-unanswered: #475569;
  --color-unanswered-bg: rgba(71, 85, 105, 0.15);

  /* Dimensions & Spacing */
  --header-height: 64px;
  --sidebar-width: 320px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 240ms cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.5);
  --shadow-dropdown: 0 10px 30px -4px rgba(0, 0, 0, 0.7);
}

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

.hidden {
  display: none !important;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-base);
}
::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ==========================================================================
   Layout Structures
   ========================================================================== */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.app-header {
  height: var(--header-height);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.4);
}

.test-title-wrapper {
  display: flex;
  flex-direction: column;
}

.test-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  max-width: 380px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.test-subtitle {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

/* Header Middle: Timer & Status & Mode Toggle */
.header-center {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.mode-toggle-group {
  display: inline-flex;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-full);
  padding: 2px;
  gap: 2px;
}

.mode-toggle-btn {
  padding: 0.3rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.mode-toggle-btn:hover {
  color: var(--text-primary);
}

.mode-toggle-btn.active {
  background-color: var(--accent-primary);
  color: #090a0f;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

.mode-toggle-btn.active.practice-active {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.4);
}

.timer-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent-primary);
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.4);
  transition: all var(--transition-fast);
}

.timer-pill.warning {
  border-color: var(--color-warning);
  color: var(--color-warning);
  background-color: var(--color-warning-bg);
  animation: pulse-warning 2s infinite;
}

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

.timer-pill.paused {
  border-color: var(--color-warning);
  color: var(--color-warning);
  background-color: var(--color-warning-bg);
  opacity: 0.9;
}

.btn-pause-test {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  padding: 0.38rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all var(--transition-fast);
}

.btn-pause-test:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background-color: var(--bg-surface-hover);
}

.btn-pause-test.paused {
  background-color: var(--color-warning-bg);
  border-color: var(--color-warning-border);
  color: var(--color-warning);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.3);
  animation: pulse-warning 2s infinite;
}

@keyframes pulse-warning {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.85; transform: scale(1.02); }
}

@keyframes pulse-danger {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.75; transform: scale(1.03); }
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Progress bar attached to header */
.header-progress-track {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: rgba(255, 255, 255, 0.06);
  overflow: hidden;
  display: block;
}

.header-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #38bdf8, #818cf8, #a855f7);
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  transition: width var(--transition-normal);
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
}

/* Main Layout Grid */
.main-wrapper {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

.test-workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
  gap: 1.25rem;
}

/* Question Card */
.question-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  transition: border-color var(--transition-fast);
}

.question-header {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1rem;
}

.question-header-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.question-nav-top-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.75rem;
  flex-wrap: wrap;
}

.question-nav-top-toolbar .nav-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn-nav-compact {
  padding: 0.42rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.question-meta-badge-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.badge-index {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
}

.badge-category {
  background-color: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: var(--accent-primary);
}

.badge-time-spent {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

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

.btn-icon-text {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface-elevated);
  transition: all var(--transition-fast);
}

.btn-icon-text:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--border-default);
}

.btn-icon-text.active-mark {
  background-color: var(--color-warning-bg);
  border-color: var(--color-warning-border);
  color: var(--color-warning);
}

.btn-icon-text.active-notes {
  background-color: var(--color-purple-bg);
  border-color: var(--color-purple-border);
  color: var(--color-purple);
}

/* Question Body */
.question-text {
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.6;
  letter-spacing: -0.01em;
}

/* Options List */
.options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.option-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem 1.2rem;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.option-item:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--border-default);
  transform: translateY(-1px);
}

.option-item.selected {
  background-color: rgba(56, 189, 248, 0.08);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 1px var(--accent-primary), inset 0 1px 0 rgba(255,255,255,0.05);
}

.option-item.selected .option-key {
  background-color: var(--accent-primary);
  color: #090a0f;
  border-color: var(--accent-primary);
  font-weight: 700;
}

.option-key {
  width: 28px;
  height: 28px;
  min-width: 28px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  display: grid;
  place-items: center;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.option-content {
  font-size: 0.98rem;
  color: var(--text-primary);
  padding-top: 0.15rem;
  flex: 1;
}

/* Practice Mode Specific Option States */
.option-item.practice-correct {
  background-color: var(--color-success-bg) !important;
  border-color: var(--color-success) !important;
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.25) !important;
}

.option-item.practice-correct .option-key {
  background-color: var(--color-success) !important;
  color: #090a0f !important;
  border-color: var(--color-success) !important;
  font-weight: 700 !important;
}

.option-item.practice-wrong {
  background-color: var(--color-danger-bg) !important;
  border-color: var(--color-danger) !important;
  box-shadow: 0 0 12px rgba(244, 63, 94, 0.25) !important;
}

.option-item.practice-wrong .option-key {
  background-color: var(--color-danger) !important;
  color: #ffffff !important;
  border-color: var(--color-danger) !important;
  font-weight: 700 !important;
}

.option-item.practice-wrong .option-content {
  text-decoration: line-through;
  color: #fda4af;
}

/* Instant Practice Feedback Card */
.practice-feedback-card {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  animation: slideDown 200ms ease-out;
}

.practice-feedback-card.correct {
  background-color: rgba(16, 185, 129, 0.08);
  border-color: var(--color-success-border);
}

.practice-feedback-card.wrong {
  background-color: rgba(244, 63, 94, 0.08);
  border-color: var(--color-danger-border);
}

.practice-feedback-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.92rem;
  font-weight: 700;
}

.practice-feedback-header.correct {
  color: var(--color-success);
}

.practice-feedback-header.wrong {
  color: var(--color-danger);
}

.practice-feedback-body {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.practice-feedback-body strong {
  color: var(--text-primary);
}

/* Notes Area */
.notes-drawer {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--color-purple-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  animation: slideDown 200ms ease-out;
}

.notes-drawer.hidden {
  display: none;
}

.notes-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--color-purple);
  font-weight: 600;
}

.notes-status-saved {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 400;
}

.notes-textarea {
  width: 100%;
  min-height: 80px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  color: var(--text-primary);
  font-size: 0.88rem;
  resize: vertical;
  line-height: 1.4;
}

.notes-textarea:focus {
  border-color: var(--color-purple);
}

/* Bottom Navigation Bar */
.test-bottom-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0;
  flex-wrap: wrap;
}

.nav-group-left, .nav-group-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Buttons */
.btn {
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: all var(--transition-fast);
}

.btn-ghost {
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  background: transparent;
}
.btn-ghost:hover:not(:disabled) {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
  border-color: var(--border-default);
}

.btn-secondary {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-default);
  color: var(--text-primary);
}
.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-surface-hover);
  border-color: var(--text-muted);
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #090a0f;
  font-weight: 600;
}
.btn-primary:hover:not(:disabled) {
  background-color: var(--accent-primary-hover);
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.4);
}

.btn-submit {
  background-color: var(--color-success);
  color: #090a0f;
  font-weight: 700;
}
.btn-submit:hover:not(:disabled) {
  background-color: #059669;
  box-shadow: 0 0 16px rgba(16, 185, 129, 0.4);
}

.btn-danger {
  background-color: var(--color-danger);
  color: #fff;
}
.btn-danger:hover {
  background-color: #e11d48;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
}

/* ==========================================================================
   Question Palette Sidebar (Sticky & Scrollable)
   ========================================================================== */
.palette-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-surface);
  border-left: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  height: calc(100vh - var(--header-height));
  max-height: calc(100vh - var(--header-height));
  position: sticky;
  top: var(--header-height);
  overflow: hidden;
  transition: transform var(--transition-normal);
  z-index: 30;
}

.palette-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.palette-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Stats Summary Widget in Palette */
.palette-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  background-color: rgba(0,0,0,0.15);
  flex-shrink: 0;
}

.summary-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.summary-pill .dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.summary-pill.answered .dot { background-color: var(--color-success); }
.summary-pill.unanswered .dot { background-color: var(--color-unanswered); }
.summary-pill.marked .dot { background-color: var(--color-warning); }
.summary-pill.marked-answered .dot {
  background: linear-gradient(135deg, var(--color-success) 50%, var(--color-warning) 50%);
}

.summary-pill-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-primary);
}

/* Palette Grid - Scrollable Container */
.palette-grid-container {
  padding: 1.25rem;
  flex: 1;
  overflow-y: auto;
  min-height: 0;
}

.palette-grid-container::-webkit-scrollbar {
  width: 6px;
}
.palette-grid-container::-webkit-scrollbar-track {
  background: var(--bg-surface);
}
.palette-grid-container::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: var(--radius-full);
}
.palette-grid-container::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.45rem;
  padding-bottom: 1rem;
}

.palette-btn {
  height: 38px;
  max-width: 44px;
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  display: grid;
  place-items: center;
  position: relative;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  margin: 0 auto;
}

.palette-btn:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
  transform: scale(1.05);
}

.palette-btn.current {
  border: 2px solid var(--accent-primary) !important;
  color: var(--text-primary);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

/* Palette States */
.palette-btn.status-answered {
  background-color: var(--color-success);
  border-color: var(--color-success);
  color: #090a0f;
  font-weight: 700;
}

.palette-btn.status-unanswered {
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-subtle);
  color: var(--text-muted);
}

.palette-btn.status-marked {
  background-color: var(--color-warning);
  border-color: var(--color-warning);
  color: #090a0f;
  font-weight: 700;
}

.palette-btn.status-marked-answered {
  background: linear-gradient(135deg, var(--color-success) 50%, var(--color-warning) 50%);
  border-color: var(--color-warning);
  color: #090a0f;
  font-weight: 700;
}

/* Notes indicator dot */
.palette-btn.has-notes::after {
  content: '';
  position: absolute;
  top: 3px;
  right: 3px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--color-purple);
  box-shadow: 0 0 4px var(--color-purple);
}

/* Mobile Sidebar Backdrop */
.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  z-index: 25;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.sidebar-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

/* ==========================================================================
   Pause Test Overlay & Blur
   ========================================================================== */
.pause-overlay {
  position: absolute;
  inset: 0;
  background: rgba(9, 10, 15, 0.88);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 1.5rem;
  animation: fadeIn 200ms ease-out;
}

.pause-overlay.hidden {
  display: none !important;
}

.pause-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-dropdown);
  max-width: 480px;
  width: 100%;
  padding: 2.25rem 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.25rem;
  animation: slideDown 240ms cubic-bezier(0.4, 0, 0.2, 1);
}

.pause-icon-ring {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background-color: var(--color-warning-bg);
  border: 2px solid var(--color-warning-border);
  color: var(--color-warning);
  display: grid;
  place-items: center;
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.25);
}

.pause-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.pause-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-top: -0.5rem;
}

.pause-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  width: 100%;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem;
}

.pause-stat-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.pause-stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pause-stat-value {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.btn-resume-test {
  padding: 0.8rem 2rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.35);
  transition: all var(--transition-fast);
}

.btn-resume-test:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 22px rgba(56, 189, 248, 0.5);
}

.card-paused {
  filter: blur(4px) grayscale(0.5);
  pointer-events: none;
  user-select: none;
}

/* ==========================================================================
   Modals & Overlays
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  display: grid;
  place-items: center;
  padding: 1rem;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  overflow-y: auto;
  transition: opacity var(--transition-fast);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
  box-shadow: var(--shadow-dropdown);
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  padding: 1.25rem 1.5rem;
  transform: scale(0.96) translateY(10px);
  transition: transform var(--transition-fast);
  margin: auto;
}

.modal-overlay.active .modal-card {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.modal-body {
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.45;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 0.85rem;
}

/* Confirmation Modal Stats List */
.confirmation-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.stat-item {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.stat-value {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-mono);
}

/* Resume Prompt Banner */
.resume-banner {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12) 0%, rgba(99, 102, 241, 0.12) 100%);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
  animation: slideDown 250ms ease-out;
}

.resume-banner.hidden {
  display: none;
}

/* ==========================================================================
   Results & Analysis Dashboard
   ========================================================================== */
.results-screen {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  width: 100%;
}

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

.results-header-card {
  background: linear-gradient(135deg, var(--bg-surface) 0%, var(--bg-surface-elevated) 100%);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.results-header-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.results-headline {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
  min-width: 260px;
}

.results-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.results-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.score-hero-container {
  display: flex;
  align-items: center;
  gap: 2rem;
}

/* Progress Ring Gauge */
.progress-ring-wrapper {
  position: relative;
  width: 120px;
  height: 120px;
  display: grid;
  place-items: center;
}

.progress-ring-circle {
  transition: stroke-dashoffset 0.8s ease-out;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
}

.progress-ring-text {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.progress-ring-pct {
  font-size: 1.4rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.progress-ring-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
}

/* Metric Cards Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.metric-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  position: relative;
  overflow: hidden;
}

.metric-card.correct { border-left: 3px solid var(--color-success); }
.metric-card.incorrect { border-left: 3px solid var(--color-danger); }
.metric-card.unanswered { border-left: 3px solid var(--color-unanswered); }
.metric-card.accuracy { border-left: 3px solid var(--accent-primary); }
.metric-card.time { border-left: 3px solid var(--color-warning); }

.metric-title {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.metric-number {
  font-size: 1.6rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

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

/* Results Action Bar & Tabs */
.results-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 1rem;
}

.filter-tabs {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.filter-tab {
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  background-color: transparent;
  transition: all var(--transition-fast);
}

.filter-tab:hover {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
}

.filter-tab.active {
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-default);
  color: var(--accent-primary);
  font-weight: 600;
}

/* Question Review List */
.review-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.review-item-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: border-color var(--transition-fast);
}

.review-item-card.status-correct {
  border-left: 4px solid var(--color-success);
}
.review-item-card.status-incorrect {
  border-left: 4px solid var(--color-danger);
}
.review-item-card.status-unanswered {
  border-left: 4px solid var(--color-unanswered);
}

.review-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.review-options-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.5rem;
}

.review-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  font-size: 0.9rem;
}

.review-option.is-correct {
  background-color: var(--color-success-bg);
  border-color: var(--color-success-border);
  color: var(--color-success);
  font-weight: 600;
}

.review-option.is-user-wrong {
  background-color: var(--color-danger-bg);
  border-color: var(--color-danger-border);
  color: var(--color-danger);
  text-decoration: line-through;
}

.explanation-box {
  background-color: rgba(56, 189, 248, 0.05);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.explanation-box strong {
  color: var(--accent-primary);
}

/* ==========================================================================
   Rich Structured Explanation Cards & Option Breakdown
   ========================================================================== */
.rich-explanation-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
  background-color: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  color: var(--text-primary);
}

.explanation-main-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-primary);
}

.explanation-simple-text {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.explanation-list {
  padding-left: 1.25rem;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

/* Solution / Key Takeaway Box */
.explanation-solution-box {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.08) 0%, rgba(99, 102, 241, 0.08) 100%);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.explanation-solution-title {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent-primary);
}

.explanation-solution-text {
  font-size: 0.88rem;
  line-height: 1.55;
  color: #e2e8f0;
}

/* Option-by-Option Breakdown List */
.explanation-options-breakdown {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.explanation-breakdown-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.15rem;
}

.explanation-option-item {
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: all var(--transition-fast);
}

.explanation-option-item.is-correct-choice {
  border-left: 3px solid var(--color-success);
  background-color: rgba(16, 185, 129, 0.06);
  border-color: rgba(16, 185, 129, 0.25);
}

.explanation-option-item.is-incorrect-choice {
  border-left: 3px solid var(--border-default);
  background-color: var(--bg-surface-elevated);
}

.explanation-option-item.is-user-picked-wrong {
  border-left: 3px solid var(--color-danger);
  background-color: rgba(244, 63, 94, 0.06);
  border-color: rgba(244, 63, 94, 0.25);
}

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

.explanation-option-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  background-color: var(--bg-surface-active);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.explanation-option-item.is-correct-choice .explanation-option-badge {
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border-color: var(--color-success-border);
}

.explanation-option-tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-left: auto;
}

.explanation-option-tag.correct {
  color: var(--color-success);
}

.explanation-option-tag.incorrect {
  color: var(--text-muted);
}

.explanation-option-text {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

/* Extra Tips & Mnemonics */
.explanation-extra-box {
  background-color: rgba(168, 85, 247, 0.08);
  border: 1px solid rgba(168, 85, 247, 0.25);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.explanation-extra-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: #c084fc;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.explanation-extra-text {
  font-size: 0.84rem;
  line-height: 1.5;
  color: #e9d5ff;
}

.inline-code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background-color: rgba(255, 255, 255, 0.08);
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  color: var(--accent-primary);
}

.review-note-box {
  background-color: var(--color-purple-bg);
  border: 1px solid var(--color-purple-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  color: #e9d5ff;
}

/* ==========================================================================
   JSON Import Modal
   ========================================================================== */
.json-dropzone {
  border: 2px dashed var(--border-default);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  cursor: pointer;
  background-color: var(--bg-surface-elevated);
  transition: all var(--transition-fast);
}

.json-dropzone:hover, .json-dropzone.dragover {
  border-color: var(--accent-primary);
  background-color: rgba(56, 189, 248, 0.05);
}

.json-textarea {
  width: 100%;
  height: 140px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background-color: var(--bg-base);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  color: var(--text-primary);
  margin-top: 0.75rem;
  resize: vertical;
}

.error-banner {
  background-color: var(--color-danger-bg);
  border: 1px solid var(--color-danger-border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.8rem;
  color: #fecdd3;
  font-size: 0.82rem;
  margin-top: 0.5rem;
  display: none;
}

.error-banner.visible {
  display: block;
}

/* Template Code Box & Modal Controls */
.modal-tabs {
  display: flex;
  gap: 0.5rem;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.25rem;
  margin-bottom: 0.75rem;
}

.modal-tab-btn {
  flex: 1;
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.modal-tab-btn.active {
  background-color: var(--bg-surface);
  color: var(--accent-primary);
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
  font-weight: 600;
}

.template-code-box {
  position: relative;
  background-color: var(--bg-base);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: #cbd5e1;
  max-height: 240px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.5;
}

/* Toast Message */
.toast-msg {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--color-success);
  color: #090a0f;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-full);
  box-shadow: 0 10px 25px -3px rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  z-index: 200;
  transform: translateY(30px);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-normal);
}

.toast-msg.show {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

/* ==========================================================================
   Animations & Responsive Breakpoints
   ========================================================================== */
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

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

.fade-in {
  animation: fadeIn 200ms ease-in-out;
}

/* Mobile & Tablet Responsiveness */
/* Mobile & Responsive Breakpoints */

/* Base touch and mobile enhancements */
@media (hover: none) and (pointer: coarse) {
  .btn, .option-item, .palette-btn, .filter-tab, .modal-tab-btn {
    -webkit-tap-highlight-color: transparent;
  }

  .option-item:active {
    background-color: var(--bg-surface-active);
    transform: scale(0.985);
  }
}

@media (max-width: 900px) {
  .palette-sidebar {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    height: 100vh;
    height: 100dvh;
    width: min(290px, 80vw);
    z-index: 120;
    transform: translateX(100%);
    box-shadow: -8px 0 30px rgba(0, 0, 0, 0.75);
    background-color: var(--bg-surface);
  }

  .palette-sidebar.open {
    transform: translateX(0);
  }

  .palette-header {
    padding: 1rem 1.25rem;
    padding-top: max(1rem, env(safe-area-inset-top));
  }

  .palette-grid-container {
    padding: 0.85rem;
    padding-bottom: max(1rem, env(safe-area-inset-bottom));
  }

  .palette-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 0.45rem;
  }

  .sidebar-backdrop {
    z-index: 110;
  }

  .test-workspace {
    padding: 1.25rem 1rem;
    max-width: 100%;
  }

  .question-card {
    padding: 1.35rem 1.25rem;
  }

  .test-title {
    max-width: 240px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: auto;
  }

  .app-header {
    min-height: 56px;
    padding: 0.45rem 0.75rem;
    padding-left: max(0.75rem, env(safe-area-inset-left));
    padding-right: max(0.75rem, env(safe-area-inset-right));
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .brand-section {
    gap: 0.5rem;
  }

  .brand-icon {
    width: 28px;
    height: 28px;
    min-width: 28px;
  }

  .brand-icon svg {
    width: 15px;
    height: 15px;
  }

  .test-title {
    font-size: 0.85rem;
    max-width: 160px;
  }

  .test-subtitle {
    font-size: 0.68rem;
  }

  .header-center {
    gap: 0.35rem;
  }

  .mode-toggle-group {
    padding: 1px;
    gap: 1px;
  }

  .mode-toggle-btn {
    padding: 0.25rem 0.45rem;
    font-size: 0.68rem;
    gap: 0.2rem;
  }

  .mode-toggle-btn svg {
    width: 11px;
    height: 11px;
  }

  .timer-pill {
    padding: 0.25rem 0.55rem;
    font-size: 0.82rem;
    gap: 0.3rem;
  }

  .timer-pill svg {
    width: 13px;
    height: 13px;
  }

  .btn-pause-test {
    padding: 0.25rem 0.5rem;
    font-size: 0.72rem;
    gap: 0.25rem;
  }

  .btn-pause-test svg {
    width: 12px;
    height: 12px;
  }

  .header-actions {
    gap: 0.35rem;
  }

  .header-actions .btn-icon-text {
    padding: 0.35rem 0.5rem;
    font-size: 0.75rem;
  }

  .brand-text {
    display: none;
  }

  .btn-sidebar-toggle {
    display: inline-flex !important;
    background-color: rgba(56, 189, 248, 0.12);
    border-color: rgba(56, 189, 248, 0.3);
    color: var(--accent-primary);
  }

  /* Workspace & Question Layout */
  .test-workspace {
    padding: 0.75rem 0.65rem;
    padding-bottom: 5.5rem;
    gap: 0.75rem;
  }

  .question-card {
    padding: 1rem 0.85rem;
    border-radius: var(--radius-md);
    gap: 0.85rem;
  }

  .question-header {
    gap: 0.6rem;
    padding-bottom: 0.65rem;
  }

  .question-header-top-row {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .question-meta-badge-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    align-items: center;
  }

  .badge {
    font-size: 0.68rem;
    padding: 0.18rem 0.45rem;
    letter-spacing: 0.01em;
  }

  .question-actions-top {
    display: flex;
    width: 100%;
    gap: 0.4rem;
  }

  .question-actions-top .btn-icon-text {
    flex: 1;
    justify-content: center;
    padding: 0.4rem 0.5rem;
    font-size: 0.75rem;
  }

  .question-nav-top-toolbar {
    display: none;
  }

  .question-text {
    font-size: 1rem;
    line-height: 1.5;
    word-break: break-word;
  }

  .options-grid {
    gap: 0.55rem;
  }

  .option-item {
    padding: 0.8rem 0.85rem;
    min-height: 48px;
    gap: 0.65rem;
    border-radius: 10px;
  }

  .option-key {
    width: 28px;
    height: 28px;
    min-width: 28px;
    font-size: 0.78rem;
    font-weight: 700;
  }

  .option-content {
    font-size: 0.9rem;
    line-height: 1.45;
  }

  /* Thumb-friendly Fixed Bottom Navigation Dock */
  .test-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(17, 20, 29, 0.96);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--border-default);
    padding: 0.55rem 0.75rem;
    padding-bottom: max(0.55rem, env(safe-area-inset-bottom));
    margin: 0;
    border-radius: 14px 14px 0 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.4rem;
    box-shadow: 0 -6px 25px rgba(0, 0, 0, 0.6);
  }

  .nav-group-left {
    display: flex;
    gap: 0.35rem;
  }

  .nav-group-right {
    display: flex;
    gap: 0.35rem;
    flex: 1;
    justify-content: flex-end;
  }

  .btn-nav-bottom {
    padding: 0.55rem 0.75rem;
    font-size: 0.8rem;
    min-height: 40px;
  }

  .notes-textarea {
    font-size: 16px !important;
  }

  /* Results Screen on Mobile */
  .results-screen {
    padding: 0.85rem 0.6rem;
    gap: 1rem;
  }

  .results-header-card {
    padding: 1.25rem 0.85rem;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1.25rem;
  }

  .results-headline {
    align-items: center;
    text-align: center;
    min-width: 100%;
  }

  .results-title {
    font-size: 1.3rem;
  }

  .results-subtitle {
    font-size: 0.82rem;
  }

  .results-headline > div {
    display: grid !important;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 0.4rem;
    width: 100%;
  }

  .results-headline > div .btn {
    font-size: 0.78rem !important;
    padding: 0.5rem 0.4rem !important;
    justify-content: center;
  }

  .score-hero-container {
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
  }

  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
  }

  .metric-card {
    padding: 0.85rem 0.75rem;
    gap: 0.25rem;
  }

  .metric-card.time {
    grid-column: span 2;
  }

  .metric-title {
    font-size: 0.7rem;
  }

  .metric-number {
    font-size: 1.35rem;
  }

  .metric-sub {
    font-size: 0.7rem;
  }

  .results-controls-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .filter-tabs {
    display: flex;
    overflow-x: auto;
    flex-wrap: nowrap;
    gap: 0.35rem;
    padding-bottom: 0.4rem;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .filter-tabs::-webkit-scrollbar {
    display: none;
  }

  .filter-tab {
    white-space: nowrap;
    flex-shrink: 0;
    padding: 0.4rem 0.75rem;
    font-size: 0.78rem;
  }

  .results-controls-bar > div:last-child {
    display: grid !important;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 0.4rem;
    width: 100%;
  }

  .results-controls-bar > div:last-child .btn {
    font-size: 0.78rem !important;
    padding: 0.5rem 0.4rem !important;
    justify-content: center;
  }

  .review-item-card {
    padding: 1rem 0.85rem;
    gap: 0.75rem;
  }

  .review-card-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
  }

  /* Modals on Mobile */
  .modal-overlay {
    padding: 0.5rem;
  }

  .modal-card {
    width: calc(100% - 0.5rem);
    padding: 1.25rem 1rem;
    max-height: calc(90vh);
    max-height: calc(90dvh);
    border-radius: 14px;
    gap: 0.75rem;
  }

  .modal-title {
    font-size: 0.95rem;
  }

  .modal-body {
    font-size: 0.84rem;
  }

  .confirmation-stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
  }

  .stat-item {
    padding: 0.45rem 0.6rem;
  }

  .stat-value {
    font-size: 0.95rem;
  }

  .modal-footer {
    display: flex;
    gap: 0.5rem;
  }

  .modal-footer .btn {
    flex: 1;
    padding: 0.6rem 0.4rem;
    font-size: 0.82rem;
    justify-content: center;
  }

  .json-dropzone {
    padding: 1rem;
  }

  .json-textarea {
    height: 110px;
    font-size: 16px !important;
  }

  .template-code-box {
    max-height: 180px;
    font-size: 0.75rem;
    padding: 0.75rem;
  }
}

@media (max-width: 420px) {
  .app-header {
    padding: 0.4rem 0.5rem;
  }

  .test-title {
    max-width: 120px;
    font-size: 0.8rem;
  }

  .palette-sidebar {
    width: min(280px, 86vw);
  }

  .palette-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 0.35rem;
  }

  .palette-btn {
    height: 36px;
    max-width: 40px;
    font-size: 0.78rem;
  }

  .pause-stats-grid {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .results-headline > div {
    grid-template-columns: 1fr;
  }

  .results-controls-bar > div:last-child {
    grid-template-columns: 1fr;
  }

  .btn-nav-bottom span {
    font-size: 0.75rem;
  }
}

/* ==========================================================================
   Print / Export Report Stylesheet
   ========================================================================== */
@media print {
  body {
    background: #ffffff !important;
    color: #111827 !important;
    font-size: 11pt;
  }

  .app-header,
  .palette-sidebar,
  .sidebar-backdrop,
  .modal-overlay,
  .results-controls-bar,
  .btn-print-hide,
  .resume-banner {
    display: none !important;
  }

  .results-screen {
    display: block !important;
    padding: 0;
    max-width: 100%;
  }

  .results-header-card, .metric-card, .review-item-card {
    background: #ffffff !important;
    color: #111827 !important;
    border: 1px solid #d1d5db !important;
    box-shadow: none !important;
    page-break-inside: avoid;
    margin-bottom: 12pt;
  }

  .results-title, .metric-number, .stat-value {
    color: #111827 !important;
  }

  .text-secondary, .metric-title, .stat-label {
    color: #4b5563 !important;
  }

  .review-option {
    background: #f9fafb !important;
    border: 1px solid #e5e7eb !important;
    color: #111827 !important;
  }

  .review-option.is-correct {
    background: #ecfdf5 !important;
    border-color: #10b981 !important;
    color: #065f46 !important;
  }

  .review-option.is-user-wrong {
    background: #fef2f2 !important;
    border-color: #ef4444 !important;
    color: #991b1b !important;
  }

  .explanation-box, .rich-explanation-card {
    background: #f8fafc !important;
    border-color: #cbd5e1 !important;
    color: #1e293b !important;
  }

  .explanation-solution-box {
    background: #eff6ff !important;
    border-color: #93c5fd !important;
  }

  .explanation-solution-title {
    color: #1d4ed8 !important;
  }

  .explanation-solution-text {
    color: #1e293b !important;
  }

  .explanation-option-item {
    background: #ffffff !important;
    border-color: #e2e8f0 !important;
  }

  .explanation-option-item.is-correct-choice {
    background: #f0fdf4 !important;
    border-left-color: #10b981 !important;
    border-color: #bbf7d0 !important;
  }

  .explanation-option-badge {
    background: #f1f5f9 !important;
    color: #1e293b !important;
    border: 1px solid #cbd5e1 !important;
  }

  .explanation-option-text {
    color: #334155 !important;
  }

  .explanation-extra-box {
    background: #faf5ff !important;
    border-color: #e9d5ff !important;
  }

  .explanation-extra-title {
    color: #7e22ce !important;
  }

  .explanation-extra-text {
    color: #4c1d95 !important;
  }

  .review-note-box {
    background: #faf5ff !important;
    border-color: #d8b4fe !important;
    color: #6b21a8 !important;
  }
}