/* Quiz Platform Styles */
:root {
  --quiz-primary: #d1039e;
  --quiz-secondary: #7c3aed;
  --quiz-success: #10b981;
  --quiz-danger: #ef4444;
  --quiz-warning: #f59e0b;
  --quiz-info: #3b82f6;
  --quiz-dark: #09090b;
  --quiz-dark-light: #18181b;
  --quiz-gray-50: #fafafa;
  --quiz-gray-100: #f4f4f5;
  --quiz-gray-200: #e4e4e7;
  --quiz-gray-300: #d4d4d8;
  --quiz-gray-400: #a1a1aa;
  --quiz-gray-500: #71717a;
  --quiz-gray-600: #52525b;
  --quiz-gray-700: #3f3f46;
  --quiz-gray-800: #27272a;
  --quiz-gray-900: #18181b;
  --quiz-gradient: linear-gradient(135deg, var(--quiz-primary) 0%, var(--quiz-secondary) 100%);
  --quiz-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --quiz-shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
  --quiz-radius: 16px;
  --quiz-radius-sm: 8px;
  --quiz-transition: all 0.3s ease;
}

/* Hide elements */
.hidden {
  display: none !important;
}

/* Quiz Platform Container */
.quiz-platform {
  min-height: 100vh;
  background: var(--quiz-gray-50);
}

/* ==================== HERO SECTION ==================== */
.quiz-hero {
  background: var(--quiz-gradient);
  padding: 140px 24px 80px;
  text-align: center;
  color: white;
  position: relative;
  overflow: hidden;
}

.quiz-hero-bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,0.15) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(255,255,255,0.1) 0%, transparent 40%);
  pointer-events: none;
}

.quiz-hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  animation: gridMove 30s linear infinite;
}

@keyframes gridMove {
  0% { transform: translate(0, 0); }
  100% { transform: translate(40px, 40px); }
}

.quiz-hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.quiz-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.quiz-hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.quiz-hero p {
  font-size: 1.2rem;
  opacity: 0.95;
  line-height: 1.6;
  max-width: 600px;
  margin: 0 auto 32px;
}

.quiz-hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

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

.hero-stat-value {
  font-size: 2.5rem;
  font-weight: 800;
}

.hero-stat-label {
  font-size: 0.9rem;
  opacity: 0.85;
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ==================== USER STATS BAR ==================== */
.user-quiz-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
  padding: 24px;
  background: white;
  border-radius: var(--quiz-radius);
  box-shadow: var(--quiz-shadow);
}

.stats-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--quiz-gray-50);
  border-radius: var(--quiz-radius-sm);
}

.stats-card i {
  font-size: 1.5rem;
  color: var(--quiz-primary);
}

.stats-info {
  display: flex;
  flex-direction: column;
}

.stats-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--quiz-dark);
}

.stats-label {
  font-size: 0.85rem;
  color: var(--quiz-gray-500);
}

/* ==================== QUIZ SELECTION SECTION ==================== */
.quiz-selection {
  padding: 60px 24px 80px;
}

.quiz-container {
  max-width: 1200px;
  margin: 0 auto;
}

/* Step Header */
.step-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 40px;
  position: relative;
}

.back-btn {
  position: absolute;
  left: 0;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: white;
  border: 2px solid var(--quiz-gray-200);
  border-radius: 50px;
  color: var(--quiz-gray-600);
  font-weight: 600;
  cursor: pointer;
  transition: var(--quiz-transition);
}

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

.step-number {
  width: 48px;
  height: 48px;
  background: var(--quiz-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-left: auto;
}

.step-info {
  flex: 1;
  text-align: center;
  margin-right: 68px;
}

.step-info h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--quiz-dark);
  margin-bottom: 8px;
}

.step-info p {
  color: var(--quiz-gray-500);
  font-size: 1rem;
}

/* ==================== COURSE SELECTION GRID ==================== */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.course-card {
  background: white;
  border-radius: var(--quiz-radius);
  overflow: hidden;
  box-shadow: var(--quiz-shadow);
  cursor: pointer;
  transition: var(--quiz-transition);
  border: 2px solid transparent;
}

.course-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--quiz-shadow-lg);
  border-color: var(--quiz-primary);
}

.course-card.selected {
  border-color: var(--quiz-primary);
  box-shadow: 0 0 0 3px rgba(209, 3, 158, 0.2);
}

.course-card-header {
  padding: 32px 24px;
  text-align: center;
  color: white;
  position: relative;
}

.course-card-header.html { background: linear-gradient(135deg, #e34c26 0%, #f16529 100%); }
.course-card-header.css { background: linear-gradient(135deg, #264de4 0%, #2965f1 100%); }
.course-card-header.javascript { background: linear-gradient(135deg, #f7df1e 0%, #e4c700 100%); color: #323330; }
.course-card-header.robotics { background: linear-gradient(135deg, #00979d 0%, #00c2cb 100%); }
.course-card-header.mixed { background: var(--quiz-gradient); }

.course-card-header i {
  font-size: 3rem;
  margin-bottom: 8px;
}

.course-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.25);
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}

.course-card-body {
  padding: 24px;
}

.course-card-body h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--quiz-dark);
  margin-bottom: 8px;
}

.course-card-body p {
  color: var(--quiz-gray-500);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.course-meta {
  display: flex;
  gap: 16px;
  color: var(--quiz-gray-500);
  font-size: 0.85rem;
  margin-bottom: 16px;
}

.course-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.course-progress {
  margin-top: 16px;
}

.progress-bar {
  height: 8px;
  background: var(--quiz-gray-200);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--quiz-gradient);
  border-radius: 4px;
  transition: width 0.5s ease;
}

.progress-text {
  font-size: 0.8rem;
  color: var(--quiz-gray-500);
  margin-top: 8px;
  display: block;
}

/* Mixed Card Tags */
.mixed-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.mixed-tags .tag {
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.tag.html { background: #fef2f2; color: #e34c26; }
.tag.css { background: #eff6ff; color: #264de4; }
.tag.js { background: #fefce8; color: #a16207; }
.tag.robotics { background: #f0fdfa; color: #00979d; }

/* ==================== MODE SELECTION GRID ==================== */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.mode-card {
  background: white;
  border-radius: var(--quiz-radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--quiz-shadow);
  cursor: pointer;
  transition: var(--quiz-transition);
  border: 2px solid transparent;
  position: relative;
}

.mode-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--quiz-shadow-lg);
  border-color: var(--quiz-primary);
}

.mode-card.selected {
  border-color: var(--quiz-primary);
  box-shadow: 0 0 0 3px rgba(209, 3, 158, 0.2);
}

.mode-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.75rem;
  color: white;
}

.mode-icon.practice { background: linear-gradient(135deg, #10b981, #059669); }
.mode-icon.timed { background: linear-gradient(135deg, #f59e0b, #d97706); }
.mode-icon.exam { background: linear-gradient(135deg, #3b82f6, #2563eb); }
.mode-icon.quick { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }

.mode-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--quiz-dark);
  margin-bottom: 12px;
}

.mode-card p {
  color: var(--quiz-gray-500);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-bottom: 20px;
}

.mode-features {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  text-align: left;
}

.mode-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  color: var(--quiz-gray-600);
  font-size: 0.875rem;
}

.mode-features li i {
  color: var(--quiz-success);
  font-size: 0.75rem;
}

.mode-badge {
  position: absolute;
  top: -10px;
  right: 20px;
  padding: 6px 14px;
  background: var(--quiz-gray-100);
  color: var(--quiz-gray-600);
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}

.mode-badge.popular {
  background: var(--quiz-gradient);
  color: white;
}

/* ==================== CONFIGURATION SECTION ==================== */
.config-container {
  max-width: 800px;
  margin: 0 auto;
}

.config-summary {
  display: flex;
  gap: 24px;
  padding: 20px 24px;
  background: var(--quiz-gradient);
  border-radius: var(--quiz-radius);
  color: white;
  margin-bottom: 32px;
}

.summary-item {
  display: flex;
  flex-direction: column;
}

.summary-label {
  font-size: 0.8rem;
  opacity: 0.8;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.summary-value {
  font-size: 1.25rem;
  font-weight: 700;
}

.config-options {
  background: white;
  border-radius: var(--quiz-radius);
  padding: 32px;
  box-shadow: var(--quiz-shadow);
  margin-bottom: 32px;
}

.config-section {
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--quiz-gray-200);
}

.config-section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.config-section h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--quiz-dark);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.config-section h4 i {
  color: var(--quiz-primary);
}

.config-desc {
  color: var(--quiz-gray-500);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

/* Topic Selection */
.topic-selection {
  max-height: 300px;
  overflow-y: auto;
}

.topic-checkbox {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--quiz-gray-50);
  border-radius: var(--quiz-radius-sm);
  cursor: pointer;
  margin-bottom: 8px;
  transition: var(--quiz-transition);
}

.topic-checkbox:hover {
  background: var(--quiz-gray-100);
}

.topic-checkbox.select-all {
  background: var(--quiz-gray-100);
  font-weight: 600;
  margin-bottom: 16px;
}

.topic-checkbox input {
  display: none;
}

.checkbox-custom {
  width: 20px;
  height: 20px;
  border: 2px solid var(--quiz-gray-300);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--quiz-transition);
}

.topic-checkbox input:checked + .checkbox-custom {
  background: var(--quiz-primary);
  border-color: var(--quiz-primary);
}

.topic-checkbox input:checked + .checkbox-custom::after {
  content: '\f00c';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  font-size: 0.7rem;
  color: white;
}

.topic-name {
  flex: 1;
  color: var(--quiz-gray-700);
}

.topics-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
}

/* Question Count Selector */
.question-count-selector {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.count-btn {
  padding: 12px 24px;
  background: white;
  border: 2px solid var(--quiz-gray-200);
  border-radius: var(--quiz-radius-sm);
  font-weight: 600;
  color: var(--quiz-gray-600);
  cursor: pointer;
  transition: var(--quiz-transition);
}

.count-btn:hover {
  border-color: var(--quiz-primary);
  color: var(--quiz-primary);
}

.count-btn.active {
  background: var(--quiz-gradient);
  border-color: var(--quiz-primary);
  color: white;
}

.available-questions {
  color: var(--quiz-gray-500);
  font-size: 0.85rem;
  margin-top: 12px;
}

/* Difficulty Selector */
.difficulty-selector {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.difficulty-option {
  cursor: pointer;
}

.difficulty-option input {
  display: none;
}

.difficulty-badge {
  padding: 10px 20px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--quiz-transition);
  opacity: 0.5;
}

.difficulty-option input:checked + .difficulty-badge {
  opacity: 1;
}

.difficulty-badge.easy { background: #d1fae5; color: #059669; }
.difficulty-badge.medium { background: #fef3c7; color: #d97706; }
.difficulty-badge.hard { background: #fee2e2; color: #dc2626; }

/* Toggle Options */
.additional-options {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.option-toggle {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.option-toggle input {
  display: none;
}

.toggle-switch {
  width: 48px;
  height: 26px;
  background: var(--quiz-gray-200);
  border-radius: 13px;
  position: relative;
  transition: var(--quiz-transition);
}

.toggle-switch::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  top: 3px;
  left: 3px;
  transition: var(--quiz-transition);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

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

.option-toggle input:checked + .toggle-switch::after {
  left: 25px;
}

.option-label {
  color: var(--quiz-gray-700);
  font-weight: 500;
}

/* Start Quiz Button */
.start-quiz-btn {
  width: 100%;
  padding: 18px 32px;
  background: var(--quiz-gradient);
  border: none;
  border-radius: var(--quiz-radius);
  color: white;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  transition: var(--quiz-transition);
}

.start-quiz-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(209, 3, 158, 0.3);
}

/* ==================== QUIZ INTERFACE ==================== */
.quiz-interface {
  padding: 120px 24px 60px;
  min-height: 100vh;
  background: var(--quiz-gray-50);
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: white;
  border-radius: var(--quiz-radius);
  box-shadow: var(--quiz-shadow);
  margin-bottom: 24px;
}

.quiz-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.quiz-course {
  font-weight: 700;
  color: var(--quiz-dark);
  font-size: 1.1rem;
}

.quiz-mode-badge {
  padding: 4px 12px;
  background: var(--quiz-gray-100);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--quiz-gray-600);
}

.quiz-timer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--quiz-gray-100);
  border-radius: var(--quiz-radius-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--quiz-dark);
}

.quiz-timer i {
  color: var(--quiz-primary);
}

.quiz-timer.warning {
  background: #fef3c7;
  color: #d97706;
}

.quiz-timer.danger {
  background: #fee2e2;
  color: #dc2626;
  animation: pulse 1s ease-in-out infinite;
}

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

.quit-quiz-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: transparent;
  border: 2px solid var(--quiz-gray-200);
  border-radius: var(--quiz-radius-sm);
  color: var(--quiz-gray-500);
  font-weight: 600;
  cursor: pointer;
  transition: var(--quiz-transition);
}

.quit-quiz-btn:hover {
  border-color: var(--quiz-danger);
  color: var(--quiz-danger);
}

/* Quiz Progress */
.quiz-progress-container {
  margin-bottom: 24px;
}

.quiz-progress-bar {
  height: 10px;
  background: var(--quiz-gray-200);
  border-radius: 5px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: var(--quiz-gradient);
  border-radius: 5px;
  transition: width 0.3s ease;
}

.quiz-progress-text {
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
  font-size: 0.9rem;
  color: var(--quiz-gray-500);
}

/* Question Navigator */
.question-navigator {
  padding: 20px;
  background: white;
  border-radius: var(--quiz-radius);
  box-shadow: var(--quiz-shadow);
  margin-bottom: 24px;
}

.navigator-title {
  font-weight: 600;
  color: var(--quiz-dark);
  margin-bottom: 16px;
}

.navigator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}

.nav-num {
  width: 40px;
  height: 40px;
  border: 2px solid var(--quiz-gray-200);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--quiz-gray-500);
  cursor: pointer;
  transition: var(--quiz-transition);
}

.nav-num:hover {
  border-color: var(--quiz-primary);
  color: var(--quiz-primary);
}

.nav-num.current {
  background: var(--quiz-primary);
  border-color: var(--quiz-primary);
  color: white;
}

.nav-num.answered {
  background: var(--quiz-success);
  border-color: var(--quiz-success);
  color: white;
}

.nav-num.flagged {
  background: var(--quiz-warning);
  border-color: var(--quiz-warning);
  color: white;
}

.navigator-legend {
  display: flex;
  gap: 20px;
  font-size: 0.8rem;
  color: var(--quiz-gray-500);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.legend-item .dot {
  width: 12px;
  height: 12px;
  border-radius: 3px;
}

.dot.answered { background: var(--quiz-success); }
.dot.flagged { background: var(--quiz-warning); }
.dot.current { background: var(--quiz-primary); }

/* Question Card */
.question-card {
  background: white;
  border-radius: var(--quiz-radius);
  padding: 32px;
  box-shadow: var(--quiz-shadow);
  margin-bottom: 24px;
}

.question-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.question-category {
  padding: 6px 14px;
  background: var(--quiz-gray-100);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--quiz-gray-600);
}

.flag-btn {
  width: 40px;
  height: 40px;
  border: 2px solid var(--quiz-gray-200);
  border-radius: 50%;
  background: transparent;
  color: var(--quiz-gray-400);
  cursor: pointer;
  transition: var(--quiz-transition);
}

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

.flag-btn.flagged {
  background: var(--quiz-warning);
  border-color: var(--quiz-warning);
  color: white;
}

.flag-btn.flagged i {
  font-weight: 900;
}

.question-text {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--quiz-dark);
  line-height: 1.5;
  margin-bottom: 24px;
}

.question-code {
  background: var(--quiz-gray-900);
  border-radius: var(--quiz-radius-sm);
  padding: 20px;
  margin-bottom: 24px;
  overflow-x: auto;
}

.question-code code {
  color: #e4e4e7;
  font-family: 'Fira Code', 'Consolas', monospace;
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Answer Options */
.answers-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.answer-option {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--quiz-gray-50);
  border: 2px solid transparent;
  border-radius: var(--quiz-radius-sm);
  cursor: pointer;
  transition: var(--quiz-transition);
}

.answer-option:hover {
  background: var(--quiz-gray-100);
  border-color: var(--quiz-gray-300);
}

.answer-option.selected {
  background: rgba(209, 3, 158, 0.1);
  border-color: var(--quiz-primary);
}

.answer-option.correct {
  background: #d1fae5;
  border-color: var(--quiz-success);
}

.answer-option.wrong {
  background: #fee2e2;
  border-color: var(--quiz-danger);
}

.answer-option.disabled {
  pointer-events: none;
}

.answer-letter {
  width: 36px;
  height: 36px;
  border: 2px solid var(--quiz-gray-300);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--quiz-gray-500);
  flex-shrink: 0;
  transition: var(--quiz-transition);
}

.answer-option.selected .answer-letter {
  background: var(--quiz-primary);
  border-color: var(--quiz-primary);
  color: white;
}

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

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

.answer-text {
  flex: 1;
  color: var(--quiz-gray-700);
  font-weight: 500;
}

.answer-icon {
  font-size: 1.25rem;
  display: none;
}

.answer-option.correct .answer-icon,
.answer-option.wrong .answer-icon {
  display: block;
}

.answer-option.correct .answer-icon { color: var(--quiz-success); }
.answer-option.wrong .answer-icon { color: var(--quiz-danger); }

/* Question Feedback */
.question-feedback {
  margin-top: 24px;
  padding: 20px;
  border-radius: var(--quiz-radius-sm);
}

.question-feedback.correct {
  background: #d1fae5;
  border: 1px solid var(--quiz-success);
}

.question-feedback.wrong {
  background: #fee2e2;
  border: 1px solid var(--quiz-danger);
}

.feedback-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.feedback-text {
  font-weight: 600;
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.feedback-explanation {
  color: var(--quiz-gray-600);
  line-height: 1.6;
}

/* Quiz Actions */
.quiz-actions {
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

.quiz-action-btn {
  padding: 14px 28px;
  border-radius: var(--quiz-radius-sm);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--quiz-transition);
}

.quiz-action-btn.primary {
  background: var(--quiz-gradient);
  border: none;
  color: white;
  margin-left: auto;
}

.quiz-action-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(209, 3, 158, 0.3);
}

.quiz-action-btn.secondary {
  background: white;
  border: 2px solid var(--quiz-gray-200);
  color: var(--quiz-gray-600);
}

.quiz-action-btn.secondary:hover {
  border-color: var(--quiz-primary);
  color: var(--quiz-primary);
}

/* ==================== RESULTS SECTION ==================== */
.quiz-results {
  padding: 120px 24px 60px;
  min-height: 100vh;
  background: var(--quiz-gray-50);
}

.results-card {
  max-width: 700px;
  margin: 0 auto;
  background: white;
  border-radius: var(--quiz-radius);
  padding: 48px;
  box-shadow: var(--quiz-shadow-lg);
  text-align: center;
}

.results-header {
  margin-bottom: 40px;
}

.score-circle {
  width: 200px;
  height: 200px;
  margin: 0 auto 24px;
  position: relative;
}

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

.score-circle circle {
  fill: none;
  stroke-width: 8;
  stroke-linecap: round;
}

.score-bg {
  stroke: var(--quiz-gray-200);
}

.score-fill {
  stroke: url(#scoreGradient);
  stroke-dasharray: 283;
  stroke-dashoffset: 283;
  transition: stroke-dashoffset 1.5s ease-out;
}

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

.score-value {
  display: block;
  font-size: 3rem;
  font-weight: 800;
  color: var(--quiz-dark);
}

.score-label {
  color: var(--quiz-gray-500);
  font-size: 0.9rem;
}

.results-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 700;
}

.results-status.pass {
  color: var(--quiz-success);
}

.results-status.fail {
  color: var(--quiz-danger);
}

.results-status i {
  font-size: 2rem;
}

/* Results Stats */
.results-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 24px;
  background: var(--quiz-gray-50);
  border-radius: var(--quiz-radius);
  margin-bottom: 32px;
}

.result-stat {
  text-align: center;
}

.result-stat i {
  font-size: 1.75rem;
  margin-bottom: 8px;
}

.result-stat i.correct { color: var(--quiz-success); }
.result-stat i.wrong { color: var(--quiz-danger); }
.result-stat i.skipped { color: var(--quiz-gray-400); }
.result-stat i.time { color: var(--quiz-info); }

.result-stat .stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--quiz-dark);
}

.result-stat .stat-label {
  color: var(--quiz-gray-500);
  font-size: 0.85rem;
}

/* Performance Breakdown */
.performance-breakdown {
  text-align: left;
  margin-bottom: 32px;
}

.performance-breakdown h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--quiz-dark);
  margin-bottom: 16px;
}

.breakdown-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.breakdown-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.breakdown-topic {
  flex: 1;
  font-size: 0.9rem;
  color: var(--quiz-gray-700);
}

.breakdown-bar {
  flex: 2;
  height: 8px;
  background: var(--quiz-gray-200);
  border-radius: 4px;
  overflow: hidden;
}

.breakdown-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease;
}

.breakdown-fill.good { background: var(--quiz-success); }
.breakdown-fill.medium { background: var(--quiz-warning); }
.breakdown-fill.poor { background: var(--quiz-danger); }

.breakdown-score {
  width: 50px;
  text-align: right;
  font-weight: 600;
  font-size: 0.9rem;
}

/* Results Actions */
.results-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.results-btn {
  padding: 14px 24px;
  border-radius: var(--quiz-radius-sm);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--quiz-transition);
}

.results-btn.primary {
  background: var(--quiz-gradient);
  border: none;
  color: white;
}

.results-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 20px rgba(209, 3, 158, 0.3);
}

.results-btn.secondary {
  background: white;
  border: 2px solid var(--quiz-gray-200);
  color: var(--quiz-gray-600);
}

.results-btn.secondary:hover {
  border-color: var(--quiz-primary);
  color: var(--quiz-primary);
}

.results-btn.outline {
  background: transparent;
  border: 2px solid var(--quiz-primary);
  color: var(--quiz-primary);
}

.results-btn.outline:hover {
  background: var(--quiz-primary);
  color: white;
}

/* Share Results */
.share-results {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--quiz-gray-200);
  color: var(--quiz-gray-500);
  font-size: 0.9rem;
}

.share-buttons {
  display: flex;
  gap: 8px;
}

.share-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--quiz-transition);
}

.share-btn:hover {
  transform: translateY(-2px);
}

.share-btn.twitter { background: #1da1f2; }
.share-btn.facebook { background: #4267b2; }
.share-btn.copy { background: var(--quiz-gray-500); }

/* ==================== REVIEW MODAL ==================== */
.review-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
}

.review-modal-content {
  width: 100%;
  max-width: 800px;
  max-height: 90vh;
  background: white;
  border-radius: var(--quiz-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.review-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--quiz-gray-200);
}

.review-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--quiz-dark);
}

.close-review {
  width: 40px;
  height: 40px;
  border: none;
  background: var(--quiz-gray-100);
  border-radius: 50%;
  cursor: pointer;
  color: var(--quiz-gray-500);
  font-size: 1.1rem;
  transition: var(--quiz-transition);
}

.close-review:hover {
  background: var(--quiz-gray-200);
  color: var(--quiz-dark);
}

.review-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.review-question {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--quiz-gray-200);
}

.review-question:last-child {
  border-bottom: none;
}

.review-q-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.review-q-num {
  padding: 4px 12px;
  background: var(--quiz-gray-100);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
}

.review-q-status {
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
}

.review-q-status.correct {
  background: #d1fae5;
  color: var(--quiz-success);
}

.review-q-status.wrong {
  background: #fee2e2;
  color: var(--quiz-danger);
}

.review-q-text {
  font-weight: 600;
  color: var(--quiz-dark);
  margin-bottom: 16px;
  line-height: 1.5;
}

.review-answers {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.review-answer {
  padding: 12px 16px;
  border-radius: var(--quiz-radius-sm);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 12px;
}

.review-answer.correct-answer {
  background: #d1fae5;
  color: var(--quiz-success);
}

.review-answer.user-wrong {
  background: #fee2e2;
  color: var(--quiz-danger);
}

.review-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-top: 1px solid var(--quiz-gray-200);
  background: var(--quiz-gray-50);
}

.review-nav-btn {
  padding: 10px 20px;
  border: 2px solid var(--quiz-gray-200);
  background: white;
  border-radius: var(--quiz-radius-sm);
  font-weight: 600;
  color: var(--quiz-gray-600);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--quiz-transition);
}

.review-nav-btn:hover {
  border-color: var(--quiz-primary);
  color: var(--quiz-primary);
}

.review-counter {
  font-weight: 600;
  color: var(--quiz-gray-500);
}

/* ==================== LOGIN MODAL ==================== */
.login-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
}

.login-modal-content {
  width: 100%;
  max-width: 400px;
  background: white;
  border-radius: var(--quiz-radius);
  padding: 40px;
  text-align: center;
  position: relative;
}

.close-modal {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border: none;
  background: var(--quiz-gray-100);
  border-radius: 50%;
  cursor: pointer;
  color: var(--quiz-gray-500);
  transition: var(--quiz-transition);
}

.close-modal:hover {
  background: var(--quiz-gray-200);
}

.login-modal-icon {
  width: 80px;
  height: 80px;
  background: var(--quiz-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
}

.login-modal-icon i {
  font-size: 2rem;
  color: white;
}

.login-modal-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--quiz-dark);
  margin-bottom: 12px;
}

.login-modal-content p {
  color: var(--quiz-gray-500);
  margin-bottom: 24px;
  line-height: 1.6;
}

.google-signin-btn {
  width: 100%;
  padding: 14px;
  background: white;
  border: 2px solid var(--quiz-gray-200);
  border-radius: var(--quiz-radius-sm);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  transition: var(--quiz-transition);
  margin-bottom: 12px;
}

.google-signin-btn:hover {
  border-color: var(--quiz-gray-400);
  box-shadow: var(--quiz-shadow);
}

.google-signin-btn img {
  width: 20px;
  height: 20px;
}

.continue-guest-btn {
  width: 100%;
  padding: 14px;
  background: transparent;
  border: none;
  color: var(--quiz-gray-500);
  font-weight: 600;
  cursor: pointer;
  transition: var(--quiz-transition);
}

.continue-guest-btn:hover {
  color: var(--quiz-primary);
}

/* ==================== RESPONSIVE DESIGN ==================== */
@media (max-width: 1024px) {
  .user-quiz-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .quiz-hero {
    padding: 120px 16px 60px;
  }

  .quiz-hero h1 {
    font-size: 2rem;
  }

  .quiz-hero-stats {
    gap: 24px;
  }

  .hero-stat-value {
    font-size: 1.75rem;
  }

  .quiz-selection {
    padding: 40px 16px 60px;
  }

  .step-header {
    flex-direction: column;
    text-align: center;
  }

  .back-btn {
    position: relative;
    margin-bottom: 16px;
  }

  .step-info {
    margin-right: 0;
  }

  .step-number {
    margin-left: 0;
  }

  .user-quiz-stats {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .course-grid,
  .mode-grid {
    grid-template-columns: 1fr;
  }

  .config-summary {
    flex-direction: column;
    gap: 12px;
  }

  .config-options {
    padding: 20px;
  }

  .topics-list {
    grid-template-columns: 1fr;
  }

  .question-count-selector {
    flex-wrap: wrap;
  }

  .count-btn {
    flex: 1;
    min-width: calc(33% - 8px);
  }

  .quiz-interface {
    padding: 100px 16px 40px;
  }

  .quiz-header {
    flex-wrap: wrap;
    gap: 12px;
  }

  .quiz-timer {
    order: -1;
    flex: 1;
    justify-content: center;
  }

  .question-card {
    padding: 20px;
  }

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

  .quiz-actions {
    flex-direction: column;
  }

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

  .quiz-action-btn.primary {
    margin-left: 0;
  }

  .results-card {
    padding: 32px 20px;
  }

  .score-circle {
    width: 150px;
    height: 150px;
  }

  .score-value {
    font-size: 2.5rem;
  }

  .results-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .results-actions {
    flex-direction: column;
  }

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

  .share-results {
    flex-direction: column;
    gap: 12px;
  }

  .review-modal-content {
    max-height: 80vh;
  }

  .review-footer {
    flex-wrap: wrap;
    gap: 12px;
  }

  .review-nav-btn {
    flex: 1;
    justify-content: center;
  }

  .review-counter {
    order: -1;
    width: 100%;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .quiz-hero {
    padding: 110px 12px 50px;
  }

  .quiz-hero p {
    font-size: 1rem;
  }

  .course-card-header {
    padding: 24px 16px;
  }

  .course-card-header i {
    font-size: 2.5rem;
  }

  .mode-card {
    padding: 24px 20px;
  }

  .mode-icon {
    width: 60px;
    height: 60px;
    font-size: 1.5rem;
  }

  .answer-option {
    padding: 12px 16px;
  }

  .answer-letter {
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
  }

  .result-stat i {
    font-size: 1.5rem;
  }

  .result-stat .stat-value {
    font-size: 1.25rem;
  }

  .login-modal-content {
    padding: 32px 24px;
  }
}

/* SVG Gradient for score circle */
.quiz-results svg defs {
  display: block;
}