/* CSS Design System for QuizForge - Premium Dark Glassmorphism */

:root {
  --bg-primary: #090d16;
  --bg-secondary: #0f1524;
  --bg-card: #151d30;
  --bg-card-hover: #1b263e;
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.2);
  
  --accent: #06b6d4;
  --accent-hover: #0891b2;
  --accent-glow: rgba(6, 182, 212, 0.25);
  
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.2);
  
  --danger: #f43f5e;
  --danger-hover: #e11d48;
  --danger-glow: rgba(244, 63, 94, 0.2);
  
  --warning: #f59e0b;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.4);
  
  --font-family: 'Plus Jakarta Sans', 'Outfit', system-ui, -apple-system, sans-serif;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 10px 25px -10px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.8);
  --shadow-glow: 0 0 20px 2px rgba(99, 102, 241, 0.15);
}

/* Reset & Global styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.5;
  background-image: 
    radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.08) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.05) 0px, transparent 50%),
    radial-gradient(at 50% 50%, rgba(15, 21, 36, 1) 0px, rgba(9, 13, 22, 1) 100%);
  background-attachment: fixed;
}

/* App Container Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  user-select: none;
}

.logo-icon {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.3);
}

.logo-text {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #fff 40%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Navigation & Breadcrumbs */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.breadcrumb-item {
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
  font-weight: 500;
}

.breadcrumb-item:hover {
  color: var(--primary);
}

.breadcrumb-item.active {
  color: var(--text-primary);
  cursor: default;
}

.breadcrumb-separator {
  color: var(--text-muted);
  user-select: none;
}

/* Views Routing */
.app-view {
  display: none;
  animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  flex-grow: 1;
}

.app-view.active {
  display: flex;
  flex-direction: column;
}

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

/* View Header Layout */
.view-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 2rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.view-title {
  font-family: 'Outfit', sans-serif;
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 0.25rem;
}

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

.title-with-actions .view-title {
  margin-bottom: 0;
}

.view-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Button UI */
.btn {
  font-family: var(--font-family);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
  user-select: none;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.15);
}

.btn-accent {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  border: none;
  box-shadow: var(--shadow-sm);
}

.btn-accent:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

.btn-accent:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
  filter: grayscale(1);
}

.btn-ghost {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  padding: 0.4rem;
  border-radius: var(--radius-sm);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
}

.btn-ghost.btn-danger:hover {
  background: rgba(244, 63, 94, 0.15);
  color: var(--danger);
}

.btn-outline-danger {
  background: transparent;
  border: 1px solid rgba(244, 63, 94, 0.3);
  color: var(--danger);
}

.btn-outline-danger:hover {
  background: rgba(244, 63, 94, 0.1);
  border-color: var(--danger);
}

.btn-large {
  padding: 0.85rem 1.75rem;
  font-size: 1.05rem;
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-block {
  width: 100%;
}

.btn-icon-only {
  width: 40px;
  height: 40px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

/* Stats Bar */
.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.stat-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.12);
}

.stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: 'Outfit', sans-serif;
  color: var(--accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-top: 0.25rem;
}

/* Card Elements */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
}

.card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h2 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.2px;
}

.card-body {
  padding: 1.5rem;
}

.card-body.scrollable {
  overflow-y: auto;
  max-height: 450px;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.flex-grow {
  flex-grow: 1;
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 180px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0.7;
  transition: opacity var(--transition-fast);
}

.project-card:hover {
  transform: translateY(-4px) scale(1.01);
  background-color: var(--bg-card-hover);
  border-color: rgba(99, 102, 241, 0.25);
  box-shadow: var(--shadow-md), var(--shadow-glow);
}

.project-card:hover::before {
  opacity: 1;
}

.project-card-info {
  margin-bottom: 1.5rem;
}

.project-card-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.project-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.project-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1rem;
}

.project-card-stats {
  display: flex;
  gap: 1rem;
}

.project-card-stat {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.card-action-hover-btn {
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-sm);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  opacity: 0;
  transform: translateX(5px);
  transition: all var(--transition-fast);
}

.project-card:hover .card-action-hover-btn {
  opacity: 1;
  transform: translateX(0);
}

/* Empty State */
.empty-state {
  grid-column: 1 / -1;
  background: var(--bg-secondary);
  border: 2px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 4rem 2rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.empty-icon {
  font-size: 3rem;
  filter: drop-shadow(0 0 10px rgba(255,255,255,0.1));
}

.empty-state h3 {
  font-size: 1.3rem;
  font-weight: 600;
}

.empty-state p {
  color: var(--text-secondary);
  max-width: 400px;
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
}

.empty-state-small {
  padding: 3rem 1rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Chapters Layout */
.chapters-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
}

.chapter-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chapter-item:hover {
  background: var(--bg-card-hover);
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateX(4px);
}

.chapter-item-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.chapter-item-icon {
  font-size: 1.2rem;
  color: var(--primary);
}

.chapter-item-name {
  font-size: 1.05rem;
  font-weight: 600;
}

.chapter-item-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.chapter-q-badge {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 20px;
}

.chapter-item:hover .chapter-q-badge {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.3);
  color: var(--primary);
}

/* Split Chapter Layout */
.chapter-layout {
  display: grid;
  grid-template-columns: 4fr 5fr;
  gap: 1.5rem;
  margin-bottom: 3rem;
  align-items: start;
}

@media (max-width: 900px) {
  .chapter-layout {
    grid-template-columns: 1fr;
  }
}

.panel-card {
  min-height: 520px;
  background: var(--bg-card);
}

.panel-card.flex-col {
  height: 520px;
}

/* Form Controls & Form groups */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-control {
  font-family: var(--font-family);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.07);
  border-color: var(--primary);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.15);
}

.form-control-select {
  font-family: var(--font-family);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 0.65rem 0.85rem;
  font-size: 0.95rem;
  cursor: pointer;
}

.form-control-select:focus {
  outline: none;
  border-color: var(--primary);
}

.text-mono {
  font-family: monospace;
  font-size: 0.85rem;
  line-height: 1.4;
  tab-size: 4;
}

/* Tab Switching */
.tab-buttons {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  gap: 1.5rem;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-family);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.6rem 0;
  cursor: pointer;
  position: relative;
  transition: color var(--transition-fast);
}

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

.tab-btn.active {
  color: var(--primary);
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.format-guide {
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-left: 3px solid var(--primary);
  margin-bottom: 0.75rem;
  overflow-x: auto;
}

/* Upload zone */
.upload-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.04);
}

.upload-icon {
  font-size: 2.5rem;
}

.upload-status-info {
  margin-top: 1rem;
  font-size: 0.85rem;
  text-align: center;
  color: var(--text-secondary);
}

/* ==========================================
   SMART PARSER REPORT PANEL
   ========================================== */
.parser-report {
  margin-top: 1rem;
  border-radius: 10px;
  padding: 1rem 1.25rem;
  font-size: 0.875rem;
  border: 1px solid transparent;
  animation: fadeIn 0.3s ease;
  text-align: left;
}

.parser-report-success {
  background: rgba(16, 185, 129, 0.08);
  border-color: rgba(16, 185, 129, 0.3);
  color: var(--text-primary);
}

.parser-report-warn {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.3);
  color: var(--text-primary);
}

.parser-report-error {
  background: rgba(239, 68, 68, 0.08);
  border-color: rgba(239, 68, 68, 0.3);
  color: var(--text-primary);
}

.parser-report-header {
  display: flex;
  align-items: flex-start;
  gap: 0.625rem;
  margin-bottom: 0.5rem;
}

.parser-report-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
  line-height: 1.4;
}

.parser-report-header strong {
  font-size: 0.9rem;
  display: block;
}

.parser-report-sub {
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: block;
  margin-top: 1px;
}

.parser-report-msg {
  margin: 0.25rem 0 0.75rem 0;
  color: var(--text-secondary);
  font-size: 0.83rem;
  line-height: 1.5;
}

.parser-fixes-list {
  margin: 0.5rem 0 0 0;
  padding: 0.625rem 0.75rem;
  background: rgba(255,255,255,0.04);
  border-radius: 6px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.parser-fixes-list li {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.parser-report-details {
  margin-top: 0.5rem;
}

.parser-report-details summary {
  cursor: pointer;
  font-size: 0.8rem;
  color: var(--primary);
  opacity: 0.8;
}
.parser-report-details summary:hover { opacity: 1; }

.parser-format-example {
  margin: 0.5rem 0 0;
  padding: 0.75rem;
  background: rgba(0,0,0,0.2);
  border-radius: 6px;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--text-secondary);
  white-space: pre;
  overflow-x: auto;
}

.parser-auto-note {
  font-size: 0.78rem;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 0.5rem;
  opacity: 0.75;
}

/* Loaded Questions List inside panels */
.questions-list-view {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.question-item-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.question-item-body {
  flex-grow: 1;
}

.question-item-text {
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.question-item-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.25rem 0.75rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.question-item-option.correct-opt {
  color: var(--success);
  font-weight: 600;
}

.question-item-delete {
  align-self: flex-start;
}

/* Quiz Interface Layout */
.quiz-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.quiz-info-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.quiz-badge {
  background: linear-gradient(135deg, var(--bg-card), var(--bg-card-hover));
  border: 1px solid var(--border-color);
  padding: 0.4rem 0.85rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.quiz-progress-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* Progress bar */
.progress-bar-container {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  margin-bottom: 2.5rem;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  width: 0%;
  transition: width 0.3s ease;
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

.quiz-workspace {
  max-width: 800px;
  margin: 0 auto 3rem;
  width: 100%;
}

/* Config screen before starting quiz */
.quiz-config-card {
  padding: 2.5rem;
  background: var(--bg-card);
}

.quiz-config-card h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  text-align: center;
}

.config-options {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem 0;
}

.form-group-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.form-group-flex label {
  font-weight: 600;
}

/* Toggle Switch UI */
.toggle-switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  user-select: none;
  font-weight: 500;
}

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

.slider {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 34px;
  transition: .4s;
  border: 1px solid var(--border-color);
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  border-radius: 50%;
  transition: .4s;
}

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

.toggle-switch input:checked + .slider:before {
  transform: translateX(20px);
}

/* Question view styles */
.quiz-timer-bar {
  display: flex;
  justify-content: flex-end;
  height: 28px;
  margin-bottom: 0.5rem;
}

.timer-display {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 700;
  font-size: 1.1rem;
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid var(--warning);
  color: var(--warning);
  padding: 0.2rem 0.75rem;
  border-radius: 12px;
}

.question-display-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-md);
  position: relative;
}

.q-number {
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.q-text {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.4;
}

.options-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.option-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.5rem;
  text-align: left;
  font-family: var(--font-family);
  color: var(--text-primary);
  font-size: 1.05rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.option-btn:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.option-prefix {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.option-btn:hover:not(:disabled) .option-prefix {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

/* Checked option states in study quiz mode */
.option-btn.selected-correct {
  background-color: var(--success-glow);
  border-color: var(--success);
  color: #fff;
}
.option-btn.selected-correct .option-prefix {
  background-color: var(--success);
  border-color: var(--success);
  color: #fff;
}

.option-btn.selected-wrong {
  background-color: var(--danger-glow);
  border-color: var(--danger);
  color: #fff;
}
.option-btn.selected-wrong .option-prefix {
  background-color: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

.option-btn.reveal-correct {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.5);
}
.option-btn.reveal-correct .option-prefix {
  background-color: var(--success);
  border-color: var(--success);
  color: #fff;
}

/* Exam Mode Selected State (no verification shown until end) */
.option-btn.exam-selected {
  background-color: var(--primary-glow);
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.25);
}
.option-btn.exam-selected .option-prefix {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
/* Exam selected options are still hoverable — show the user they can change */
.option-btn.exam-selected:hover {
  background-color: rgba(99, 102, 241, 0.2);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.35);
  cursor: pointer;
}


.quiz-controls-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

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

/* Results view layouts */
.results-layout {
  display: grid;
  grid-template-columns: 4fr 5fr;
  gap: 1.5rem;
  margin-bottom: 3rem;
  align-items: start;
}

@media (max-width: 900px) {
  .results-layout {
    grid-template-columns: 1fr;
  }
}

.result-card {
  background: var(--bg-card);
  padding: 2rem;
}

.center-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.result-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

/* Scoring Ring SVG animation */
.score-ring-container {
  position: relative;
  width: 150px;
  height: 150px;
  margin-bottom: 2rem;
}

.score-ring {
  transform: rotate(-90deg);
  width: 100%;
  height: 100%;
}

.score-ring-bg {
  fill: none;
  stroke: rgba(255, 255, 255, 0.05);
  stroke-width: 10;
}

.score-ring-fill {
  fill: none;
  stroke: url(#ring-gradient);
  stroke-width: 10;
  stroke-linecap: round;
  transition: stroke-dashoffset 1s ease-out;
}

/* To bypass standard stroke gradient, let's inject fallback styling */
.score-ring-fill {
  stroke: var(--primary);
}

.score-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.1;
}

.score-percentage {
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  font-family: 'Outfit', sans-serif;
}

.score-ratio {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.results-stats-row {
  display: flex;
  justify-content: space-around;
  width: 100%;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 1.25rem 0;
  margin-bottom: 2rem;
}

.result-stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.result-stat-item span {
  font-size: 1.4rem;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
}

.result-stat-item label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 0.25rem;
}

.color-success {
  color: var(--success);
}

.color-danger {
  color: var(--danger);
}

.results-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
}

/* Review answers accordion/list in results */
.review-card {
  height: 570px;
  background: var(--bg-card);
}

.review-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.review-item-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.review-item-card.correct-card {
  border-left: 4px solid var(--success);
}

.review-item-card.wrong-card {
  border-left: 4px solid var(--danger);
}

.review-q-text {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.review-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.85rem;
}

.review-option {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.01);
  border: 1px solid transparent;
}

.review-option.user-choice-wrong {
  background-color: var(--danger-glow);
  border-color: rgba(244, 63, 94, 0.3);
  color: #fff;
  font-weight: 500;
}

.review-option.correct-choice {
  background-color: var(--success-glow);
  border-color: rgba(16, 185, 129, 0.3);
  color: #fff;
  font-weight: 500;
}

/* Modals & Dialogs overlays */
.modal-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  z-index: 100;
  animation: fadeInFast 0.2s ease-out;
}

.modal {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.95);
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 500px;
  z-index: 101;
  box-shadow: var(--shadow-lg);
  animation: modalIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
}

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

@keyframes modalIn {
  from { opacity: 0; transform: translate(-50%, -46%) scale(0.95); }
  to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

.modal.active, .modal-backdrop.active {
  display: block;
}

.modal.active {
  display: flex;
  flex-direction: column;
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
}

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

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  background: rgba(0, 0, 0, 0.1);
}

/* Import/Export Backup Details */
.backup-actions {
  margin-top: 1rem;
}

.file-import-row {
  display: flex;
  gap: 0.5rem;
}

.form-control-file {
  background: rgba(255, 255, 255, 0.03);
  border: 1px dashed var(--border-color);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  width: 100%;
  color: var(--text-secondary);
}

/* Toast System styling */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 999;
}

.toast {
  background: #182237;
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 1rem 1.5rem;
  box-shadow: var(--shadow-lg);
  font-weight: 600;
  font-size: 0.9rem;
  min-width: 280px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transform: translateY(20px);
  opacity: 0;
  animation: toastIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes toastIn {
  to { transform: translateY(0); opacity: 1; }
}

.toast.toast-success {
  border-left-color: var(--success);
}

.toast.toast-danger {
  border-left-color: var(--danger);
}

.toast-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.1rem;
  margin-left: 1rem;
}

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

/* History Table Styling */
.history-card-panel {
  background: var(--bg-card);
  margin-top: 2rem;
}

.table-responsive {
  overflow-x: auto;
  width: 100%;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.5rem;
  font-size: 0.95rem;
}

.history-table th, 
.history-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.history-table th {
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.history-table tbody tr {
  transition: background-color var(--transition-fast);
}

.history-table tbody tr:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

/* Badge for score results */
.badge-score {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.85rem;
}

.badge-score-high {
  background: var(--success-glow);
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-score-mid {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-score-low {
  background: var(--danger-glow);
  color: var(--danger);
  border: 1px solid rgba(244, 63, 94, 0.3);
}