/* ============================================================
   QUIZ SYSTEM - PREMIUM INTERACTIVE STYLING
   Professional, Modern, and Engaging Assessment Experience
   ============================================================ */

/* ===========================
   CSS VARIABLES
   =========================== */
:root {
  --quiz-primary: #d1039e;
  --quiz-primary-dark: #7a0060;
  --quiz-primary-light: rgba(209, 3, 158, 0.1);
  --quiz-primary-glow: rgba(209, 3, 158, 0.3);
  --quiz-success: #10b981;
  --quiz-success-light: rgba(16, 185, 129, 0.1);
  --quiz-success-glow: rgba(16, 185, 129, 0.3);
  --quiz-error: #ef4444;
  --quiz-error-light: rgba(239, 68, 68, 0.1);
  --quiz-error-glow: rgba(239, 68, 68, 0.3);
  --quiz-warning: #f59e0b;
  --quiz-warning-light: rgba(245, 158, 11, 0.1);
  --quiz-bg: #ffffff;
  --quiz-bg-secondary: #f8fafc;
  --quiz-text: #1a1a2e;
  --quiz-text-muted: #64748b;
  --quiz-border: rgba(0, 0, 0, 0.08);
  --quiz-radius: 16px;
  --quiz-radius-sm: 12px;
  --quiz-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --quiz-shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
  --quiz-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===========================
   QUIZ CONTAINER
   =========================== */
.quiz-container {
  margin: 40px 0;
  padding: 0;
  animation: quizFadeIn 0.6s ease-out;
}

@keyframes quizFadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===========================
   QUIZ HEADER - START SCREEN
   =========================== */
.quiz-header {
  background: linear-gradient(135deg, var(--quiz-bg) 0%, var(--quiz-bg-secondary) 100%);
  border-radius: var(--quiz-radius);
  padding: 40px;
  text-align: center;
  border: 1px solid var(--quiz-border);
  box-shadow: var(--quiz-shadow);
  position: relative;
  overflow: hidden;
}

.quiz-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--quiz-primary), #7c3aed, #06b6d4);
  border-radius: var(--quiz-radius) var(--quiz-radius) 0 0;
}

.quiz-header-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 24px;
  background: linear-gradient(135deg, var(--quiz-primary-light), rgba(124, 58, 237, 0.1));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: quizIconPulse 2s ease-in-out infinite;
}

@keyframes quizIconPulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 var(--quiz-primary-glow); }
  50% { transform: scale(1.05); box-shadow: 0 0 20px var(--quiz-primary-glow); }
}

.quiz-header-icon i {
  font-size: 2.5rem;
  background: linear-gradient(135deg, var(--quiz-primary), #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.quiz-header h3 {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--quiz-text);
  margin: 0 0 12px 0;
}

.quiz-header p {
  font-size: 1rem;
  color: var(--quiz-text-muted);
  margin: 0 0 8px 0;
  line-height: 1.6;
}

.quiz-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin: 24px 0 32px;
  flex-wrap: wrap;
}

.quiz-stat {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  background: var(--quiz-bg-secondary);
  border-radius: 50px;
  border: 1px solid var(--quiz-border);
}

.quiz-stat i {
  font-size: 1.1rem;
  color: var(--quiz-primary);
}

.quiz-stat span {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--quiz-text);
}

/* ===========================
   QUIZ START BUTTON
   =========================== */
.quiz-start-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 40px;
  background: linear-gradient(135deg, var(--quiz-primary), var(--quiz-primary-dark));
  color: white;
  border: none;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--quiz-transition);
  box-shadow: 0 4px 20px var(--quiz-primary-glow);
  position: relative;
  overflow: hidden;
}

.quiz-start-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.quiz-start-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px var(--quiz-primary-glow);
}

.quiz-start-btn:hover::before {
  left: 100%;
}

.quiz-start-btn:active {
  transform: translateY(-1px);
}

.quiz-start-btn i {
  font-size: 1.2rem;
}

/* ===========================
   QUIZ ACTIVE STATE
   =========================== */
.quiz-active {
  background: var(--quiz-bg);
  border-radius: var(--quiz-radius);
  border: 1px solid var(--quiz-border);
  box-shadow: var(--quiz-shadow-lg);
  overflow: hidden;
}

/* Progress Bar */
.quiz-progress {
  padding: 20px 24px;
  background: linear-gradient(135deg, var(--quiz-bg-secondary), var(--quiz-bg));
  border-bottom: 1px solid var(--quiz-border);
}

.quiz-progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.quiz-progress-text {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--quiz-text);
}

.quiz-progress-count {
  font-size: 0.85rem;
  color: var(--quiz-text-muted);
}

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

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--quiz-primary), #7c3aed);
  border-radius: 4px;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.quiz-progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: progressShimmer 2s infinite;
}

@keyframes progressShimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* Question Container */
.quiz-question {
  padding: 32px;
  animation: questionSlide 0.4s ease-out;
}

@keyframes questionSlide {
  from {
    opacity: 0;
    transform: translateX(20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.quiz-question-number {
  display: inline-block;
  padding: 6px 16px;
  background: linear-gradient(135deg, var(--quiz-primary-light), rgba(124, 58, 237, 0.08));
  color: var(--quiz-primary);
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: 50px;
  margin-bottom: 16px;
}

.quiz-question-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--quiz-text);
  margin: 0 0 28px 0;
  line-height: 1.5;
}

/* ===========================
   QUIZ OPTIONS
   =========================== */
.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.quiz-option {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 24px;
  background: var(--quiz-bg-secondary);
  border: 2px solid var(--quiz-border);
  border-radius: var(--quiz-radius-sm);
  cursor: pointer;
  transition: var(--quiz-transition);
  position: relative;
  overflow: hidden;
}

.quiz-option::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: transparent;
  transition: var(--quiz-transition);
}

.quiz-option:hover:not(.disabled) {
  border-color: var(--quiz-primary);
  background: linear-gradient(135deg, var(--quiz-primary-light), rgba(124, 58, 237, 0.05));
  transform: translateX(4px);
}

.quiz-option:hover:not(.disabled)::before {
  background: linear-gradient(180deg, var(--quiz-primary), #7c3aed);
}

.quiz-option.selected {
  border-color: var(--quiz-primary);
  background: linear-gradient(135deg, var(--quiz-primary-light), rgba(124, 58, 237, 0.1));
}

.quiz-option.selected::before {
  background: linear-gradient(180deg, var(--quiz-primary), #7c3aed);
}

.quiz-option.correct {
  border-color: var(--quiz-success);
  background: linear-gradient(135deg, var(--quiz-success-light), rgba(16, 185, 129, 0.05));
}

.quiz-option.correct::before {
  background: var(--quiz-success);
}

.quiz-option.incorrect {
  border-color: var(--quiz-error);
  background: linear-gradient(135deg, var(--quiz-error-light), rgba(239, 68, 68, 0.05));
}

.quiz-option.incorrect::before {
  background: var(--quiz-error);
}

.quiz-option.disabled {
  cursor: default;
  pointer-events: none;
}

.quiz-option-letter {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--quiz-bg);
  border: 2px solid var(--quiz-border);
  border-radius: 50%;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--quiz-text-muted);
  flex-shrink: 0;
  transition: var(--quiz-transition);
}

.quiz-option:hover:not(.disabled) .quiz-option-letter {
  border-color: var(--quiz-primary);
  color: var(--quiz-primary);
}

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

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

.quiz-option.incorrect .quiz-option-letter {
  background: var(--quiz-error);
  border-color: var(--quiz-error);
  color: white;
}

.quiz-option-text {
  font-size: 1rem;
  color: var(--quiz-text);
  line-height: 1.5;
  flex: 1;
}

.quiz-option-icon {
  font-size: 1.2rem;
  opacity: 0;
  transition: var(--quiz-transition);
}

.quiz-option.correct .quiz-option-icon,
.quiz-option.incorrect .quiz-option-icon {
  opacity: 1;
}

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

.quiz-option.incorrect .quiz-option-icon {
  color: var(--quiz-error);
}

/* ===========================
   EXPLANATION BOX
   =========================== */
.quiz-explanation {
  margin-top: 24px;
  padding: 20px 24px;
  background: linear-gradient(135deg, #eff6ff, #dbeafe);
  border-radius: var(--quiz-radius-sm);
  border-left: 4px solid #3b82f6;
  animation: explanationFade 0.4s ease-out;
}

@keyframes explanationFade {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.quiz-explanation-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.quiz-explanation-header i {
  font-size: 1.1rem;
  color: #3b82f6;
}

.quiz-explanation-header span {
  font-size: 0.95rem;
  font-weight: 700;
  color: #1e40af;
}

.quiz-explanation p {
  margin: 0;
  font-size: 0.95rem;
  color: #1e3a8a;
  line-height: 1.6;
}

/* ===========================
   QUIZ ACTIONS
   =========================== */
.quiz-actions {
  padding: 24px 32px;
  background: var(--quiz-bg-secondary);
  border-top: 1px solid var(--quiz-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.quiz-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border: none;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--quiz-transition);
}

.quiz-btn-primary {
  background: linear-gradient(135deg, var(--quiz-primary), var(--quiz-primary-dark));
  color: white;
  box-shadow: 0 4px 15px var(--quiz-primary-glow);
}

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

.quiz-btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.quiz-btn-secondary {
  background: var(--quiz-bg);
  color: var(--quiz-text);
  border: 2px solid var(--quiz-border);
}

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

/* ===========================
   QUIZ RESULTS
   =========================== */
.quiz-results {
  padding: 48px 40px;
  text-align: center;
  animation: resultsFade 0.6s ease-out;
}

@keyframes resultsFade {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.quiz-results-icon {
  width: 100px;
  height: 100px;
  margin: 0 auto 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: resultsIconBounce 0.6s ease-out 0.2s both;
}

@keyframes resultsIconBounce {
  0% { transform: scale(0); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.quiz-results-icon.excellent {
  background: linear-gradient(135deg, var(--quiz-success-light), rgba(16, 185, 129, 0.2));
}

.quiz-results-icon.excellent i {
  color: var(--quiz-success);
}

.quiz-results-icon.good {
  background: linear-gradient(135deg, #dbeafe, rgba(59, 130, 246, 0.2));
}

.quiz-results-icon.good i {
  color: #3b82f6;
}

.quiz-results-icon.needs-work {
  background: linear-gradient(135deg, var(--quiz-warning-light), rgba(245, 158, 11, 0.2));
}

.quiz-results-icon.needs-work i {
  color: var(--quiz-warning);
}

.quiz-results-icon i {
  font-size: 3rem;
}

.quiz-results h3 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--quiz-text);
  margin: 0 0 12px 0;
}

.quiz-results-message {
  font-size: 1.1rem;
  color: var(--quiz-text-muted);
  margin: 0 0 32px 0;
}

.quiz-score-display {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.quiz-score-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: conic-gradient(
    var(--quiz-primary) calc(var(--score-percent) * 1%),
    var(--quiz-border) calc(var(--score-percent) * 1%)
  );
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.quiz-score-circle::before {
  content: '';
  position: absolute;
  width: 110px;
  height: 110px;
  background: var(--quiz-bg);
  border-radius: 50%;
}

.quiz-score-value {
  position: relative;
  z-index: 1;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--quiz-primary);
}

.quiz-score-value span {
  font-size: 1.25rem;
  font-weight: 600;
}

.quiz-score-breakdown {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.quiz-score-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  background: var(--quiz-bg-secondary);
  border-radius: var(--quiz-radius-sm);
  border: 1px solid var(--quiz-border);
}

.quiz-score-item i {
  font-size: 1.1rem;
  width: 24px;
}

.quiz-score-item.correct i {
  color: var(--quiz-success);
}

.quiz-score-item.incorrect i {
  color: var(--quiz-error);
}

.quiz-score-item.skipped i {
  color: var(--quiz-text-muted);
}

.quiz-score-item span {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--quiz-text);
}

.quiz-results-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.quiz-btn-success {
  background: linear-gradient(135deg, var(--quiz-success), #059669);
  color: white;
  box-shadow: 0 4px 15px var(--quiz-success-glow);
}

.quiz-btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--quiz-success-glow);
}

/* ===========================
   QUIZ REVIEW MODE
   =========================== */
.quiz-review {
  padding: 32px;
}

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

.quiz-review-header h4 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--quiz-text);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.quiz-review-header h4 i {
  color: var(--quiz-primary);
}

.quiz-review-item {
  padding: 24px;
  background: var(--quiz-bg-secondary);
  border-radius: var(--quiz-radius-sm);
  margin-bottom: 20px;
  border: 1px solid var(--quiz-border);
}

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

.quiz-review-item.incorrect {
  border-left: 4px solid var(--quiz-error);
}

.quiz-review-question {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--quiz-text);
  margin-bottom: 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.quiz-review-question-number {
  background: var(--quiz-primary-light);
  color: var(--quiz-primary);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.quiz-review-answers {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.quiz-review-answer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
}

.quiz-review-answer.user-answer {
  background: var(--quiz-error-light);
  border: 1px solid var(--quiz-error);
}

.quiz-review-answer.correct-answer {
  background: var(--quiz-success-light);
  border: 1px solid var(--quiz-success);
}

.quiz-review-answer i {
  font-size: 0.9rem;
}

.quiz-review-answer.user-answer i {
  color: var(--quiz-error);
}

.quiz-review-answer.correct-answer i {
  color: var(--quiz-success);
}

/* ===========================
   RESPONSIVE DESIGN
   =========================== */
@media (max-width: 768px) {
  .quiz-header {
    padding: 32px 24px;
  }

  .quiz-header-icon {
    width: 70px;
    height: 70px;
  }

  .quiz-header-icon i {
    font-size: 2rem;
  }

  .quiz-header h3 {
    font-size: 1.5rem;
  }

  .quiz-stats {
    gap: 16px;
  }

  .quiz-stat {
    padding: 10px 16px;
  }

  .quiz-question {
    padding: 24px;
  }

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

  .quiz-option {
    padding: 14px 18px;
    gap: 12px;
  }

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

  .quiz-actions {
    padding: 20px 24px;
    flex-direction: column;
  }

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

  .quiz-results {
    padding: 32px 24px;
  }

  .quiz-score-display {
    flex-direction: column;
    gap: 24px;
  }

  .quiz-score-breakdown {
    width: 100%;
    text-align: center;
  }

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

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

@media (max-width: 480px) {
  .quiz-header {
    padding: 24px 16px;
  }

  .quiz-header h3 {
    font-size: 1.3rem;
  }

  .quiz-header p {
    font-size: 0.9rem;
  }

  .quiz-start-btn {
    padding: 14px 32px;
    font-size: 1rem;
  }

  .quiz-question {
    padding: 20px 16px;
  }

  .quiz-option {
    padding: 12px 14px;
  }

  .quiz-option-text {
    font-size: 0.9rem;
  }

  .quiz-score-circle {
    width: 120px;
    height: 120px;
  }

  .quiz-score-circle::before {
    width: 95px;
    height: 95px;
  }

  .quiz-score-value {
    font-size: 2rem;
  }
}

/* ===========================
   ANIMATIONS
   =========================== */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.quiz-option.incorrect.animate {
  animation: shake 0.4s ease-in-out;
}

/* ===========================
   ACCESSIBILITY
   =========================== */
.quiz-option:focus-visible,
.quiz-btn:focus-visible {
  outline: 3px solid var(--quiz-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ===========================
   QUIZ LOGIN PROMPT (Locked State)
   =========================== */
.quiz-header-icon.quiz-locked {
  background: linear-gradient(135deg, rgba(100, 116, 139, 0.15), rgba(100, 116, 139, 0.1));
  animation: none;
}

.quiz-header-icon.quiz-locked i {
  background: linear-gradient(135deg, #64748b, #475569);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.quiz-login-prompt {
  margin-top: 32px;
  padding: 24px;
  background: linear-gradient(135deg, rgba(209, 3, 158, 0.05), rgba(124, 58, 237, 0.05));
  border-radius: var(--quiz-radius-sm);
  border: 1px dashed rgba(209, 3, 158, 0.3);
}

.quiz-login-prompt p {
  color: var(--quiz-text-muted);
  font-size: 1rem;
  margin: 0 0 20px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.quiz-login-prompt p i {
  color: var(--quiz-primary);
  font-size: 1.1rem;
}

.quiz-signin-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 14px 32px;
  background: #ffffff;
  color: #1a1a2e;
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid #e2e8f0;
  border-radius: 50px;
  cursor: pointer;
  transition: var(--quiz-transition);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.quiz-signin-btn:hover {
  background: #f8fafc;
  border-color: #d1039e;
  box-shadow: 0 4px 16px rgba(209, 3, 158, 0.15);
  transform: translateY(-2px);
}

.quiz-signin-btn i {
  font-size: 1.2rem;
  color: #4285f4;
}

/* ===========================
   PRINT STYLES
   =========================== */
@media print {
  .quiz-container {
    display: none;
  }
}