* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #06b6d4;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --dark: #1e1b4b;
  --gray: #64748b;
  --gray-light: #e2e8f0;
  --light: #f8fafc;
  --white: #ffffff;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  --shadow-sm: 0 4px 15px rgba(0, 0, 0, 0.1);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-full: 50px;
}

body {
  font-family: "Poppins", sans-serif;
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4c1d95 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  color: var(--dark);
}

/* Confetti Canvas */
#confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1000;
}

/* Container */
.container {
  max-width: 600px;
  width: 100%;
  position: relative;
}

/* Screens */
.screen {
  background: var(--white);
  border-radius: 24px;
  padding: 30px;
  box-shadow: var(--shadow);
  animation: fadeIn 0.4s ease;
}

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

.hidden {
  display: none !important;
}

/* Start Screen */
.logo {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 2.5rem;
  color: var(--white);
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.4);
}

h1 {
  text-align: center;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dark);
  margin-bottom: 5px;
}

.tagline {
  text-align: center;
  color: var(--gray);
  font-size: 1rem;
  margin-bottom: 30px;
}

/* Selection Groups */
.selection-group {
  margin-bottom: 25px;
}

.selection-group h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.selection-group h3 i {
  color: var(--primary);
}

/* Category Grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}

.category-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 15px 10px;
  background: var(--gray-light);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: "Poppins", sans-serif;
}

.category-btn i {
  font-size: 1.5rem;
  color: var(--gray);
}

.category-btn span {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--gray);
}

.category-btn:hover {
  background: #ddd6fe;
  border-color: var(--primary);
}

.category-btn:hover i,
.category-btn:hover span {
  color: var(--primary);
}

.category-btn.active {
  background: var(--primary);
  border-color: var(--primary);
}

.category-btn.active i,
.category-btn.active span {
  color: var(--white);
}

/* Difficulty Options */
.difficulty-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.difficulty-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 15px;
  background: var(--gray-light);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: "Poppins", sans-serif;
}

.difficulty-btn i {
  font-size: 1.5rem;
  margin-bottom: 5px;
  color: var(--gray);
}

.difficulty-btn .diff-label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--dark);
}

.difficulty-btn .diff-desc {
  font-size: 0.7rem;
  color: var(--gray);
}

.difficulty-btn:hover {
  border-color: var(--primary);
  background: #f0f0ff;
}

.difficulty-btn.active {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-color: transparent;
}

.difficulty-btn.active i,
.difficulty-btn.active .diff-label,
.difficulty-btn.active .diff-desc {
  color: var(--white);
}

/* Easy - Green tint */
.difficulty-btn[data-difficulty="easy"].active {
  background: linear-gradient(135deg, var(--success), #059669);
}

/* Hard - Red tint */
.difficulty-btn[data-difficulty="hard"].active {
  background: linear-gradient(135deg, var(--danger), #dc2626);
}

/* Count & Timer Options */
.count-options,
.timer-options {
  display: flex;
  gap: 10px;
}

.count-btn,
.timer-btn {
  flex: 1;
  padding: 12px 15px;
  background: var(--gray-light);
  border: 2px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-family: "Poppins", sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--gray);
  transition: all 0.3s ease;
}

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 28px;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  font-family: "Poppins", sans-serif;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  box-shadow: 0 5px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--gray-light);
  color: var(--gray);
}

.btn-secondary:hover {
  background: #cbd5e1;
  color: var(--dark);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--gray-light);
  color: var(--gray);
}

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

.btn-large {
  width: 100%;
  padding: 18px;
  font-size: 1.1rem;
  margin-top: 10px;
}

.btn-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: var(--gray-light);
  border-radius: 50%;
  cursor: pointer;
  color: var(--gray);
  transition: all 0.3s ease;
}

.btn-icon:hover {
  background: var(--danger);
  color: var(--white);
}

/* Stats Preview */
.stats-preview {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-top: 25px;
  padding-top: 25px;
  border-top: 1px solid var(--gray-light);
}

.stats-preview .stat-item {
  text-align: center;
}

.stats-preview .stat-item i {
  font-size: 1.2rem;
  color: var(--primary);
  margin-bottom: 5px;
}

.stats-preview .stat-item span {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--dark);
}

.stats-preview .stat-item label {
  font-size: 0.75rem;
  color: var(--gray);
}

/* Quiz Screen */
.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.quiz-info {
  display: flex;
  gap: 10px;
}

.category-badge,
.difficulty-badge {
  padding: 6px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.category-badge {
  background: #ede9fe;
  color: var(--primary);
}

.difficulty-badge {
  background: #fef3c7;
  color: var(--warning);
}

.difficulty-badge.easy {
  background: #d1fae5;
  color: var(--success);
}

.difficulty-badge.hard {
  background: #fee2e2;
  color: var(--danger);
}

/* Progress Bar */
.progress-container {
  margin-bottom: 15px;
}

.progress-bar {
  height: 8px;
  background: var(--gray-light);
  border-radius: 10px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 10px;
  transition: width 0.3s ease;
  width: 0%;
}

.progress-text {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--gray);
}

.score-display {
  color: var(--warning);
  font-weight: 600;
}

/* Timer */
.timer-container {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.timer-bar {
  flex: 1;
  height: 6px;
  background: var(--gray-light);
  border-radius: 10px;
  overflow: hidden;
}

.timer-fill {
  height: 100%;
  background: var(--success);
  border-radius: 10px;
  transition: width 0.1s linear, background 0.3s ease;
  width: 100%;
}

.timer-fill.warning {
  background: var(--warning);
}

.timer-fill.danger {
  background: var(--danger);
}

.timer-text {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--gray);
  min-width: 40px;
}

/* Question Card */
.question-card {
  background: linear-gradient(135deg, #f8fafc, #f1f5f9);
  padding: 25px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  position: relative;
}

.question-number {
  position: absolute;
  top: -10px;
  left: 20px;
  background: var(--primary);
  color: var(--white);
  padding: 5px 15px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 600;
}

.question-text {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--dark);
  line-height: 1.6;
  margin-top: 10px;
}

/* Options */
.options-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.option {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 16px 20px;
  background: var(--white);
  border: 2px solid var(--gray-light);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
  color: var(--dark);
}

.option:hover:not(.disabled) {
  border-color: var(--primary);
  background: #f8f7ff;
  transform: translateX(5px);
}

.option .option-letter {
  width: 35px;
  height: 35px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-light);
  border-radius: 50%;
  font-weight: 700;
  color: var(--gray);
  flex-shrink: 0;
  transition: all 0.3s ease;
}

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

.option.selected {
  border-color: var(--primary);
  background: #ede9fe;
}

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

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

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

.option.correct::after {
  content: "\f00c";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  margin-left: auto;
  color: var(--success);
  font-size: 1.2rem;
}

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

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

.option.wrong::after {
  content: "\f00d";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  margin-left: auto;
  color: var(--danger);
  font-size: 1.2rem;
}

.option.disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

.option.hint-removed {
  opacity: 0.3;
  pointer-events: none;
  text-decoration: line-through;
}

/* Quiz Actions */
.quiz-actions {
  display: flex;
  gap: 15px;
}

.quiz-actions .btn {
  flex: 1;
}

/* Hint Container */
.hint-container {
  margin-top: 15px;
  text-align: center;
}

.hint-btn {
  padding: 10px 20px;
  background: #fef3c7;
  border: 2px solid var(--warning);
  border-radius: var(--radius-full);
  color: var(--warning);
  font-family: "Poppins", sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.hint-btn:hover {
  background: var(--warning);
  color: var(--white);
}

.hint-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Result Screen */
#result-screen {
  text-align: center;
}

.result-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 2.5rem;
}

.result-icon.excellent {
  background: linear-gradient(135deg, #fef3c7, #fcd34d);
  color: var(--warning);
}

.result-icon.good {
  background: linear-gradient(135deg, #d1fae5, #6ee7b7);
  color: var(--success);
}

.result-icon.average {
  background: linear-gradient(135deg, #ddd6fe, #a78bfa);
  color: var(--primary);
}

.result-icon.poor {
  background: linear-gradient(135deg, #fee2e2, #fca5a5);
  color: var(--danger);
}

.result-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 5px;
}

.result-subtitle {
  color: var(--gray);
  margin-bottom: 25px;
}

/* Score Circle */
.score-circle {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 0 auto 15px;
}

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

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

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

.score-progress {
  stroke: var(--success);
  stroke-linecap: round;
  stroke-dasharray: 283;
  stroke-dashoffset: 283;
  transition: stroke-dashoffset 1s ease;
}

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

.score-value {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dark);
}

.score-total {
  font-size: 1rem;
  color: var(--gray);
}

.score-percentage {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--success);
  margin-bottom: 25px;
}

/* Result Stats */
.result-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
  margin-bottom: 25px;
}

.result-stat {
  text-align: center;
  padding: 15px;
  background: var(--gray-light);
  border-radius: var(--radius-sm);
}

.result-stat i {
  font-size: 1.2rem;
  margin-bottom: 5px;
}

.result-stat span {
  display: block;
  font-size: 1.3rem;
  font-weight: 700;
}

.result-stat label {
  font-size: 0.7rem;
  color: var(--gray);
  text-transform: uppercase;
}

.result-stat.correct i {
  color: var(--success);
}
.result-stat.wrong i {
  color: var(--danger);
}
.result-stat.skipped i {
  color: var(--warning);
}
.result-stat.time i {
  color: var(--primary);
}

/* Result Actions */
.result-actions {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
}

.result-actions .btn {
  flex: 1;
}

/* Share Section */
.share-section {
  padding: 20px;
  background: var(--gray-light);
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.share-section h3 {
  font-size: 0.9rem;
  color: var(--dark);
  margin-bottom: 15px;
}

.share-buttons {
  display: flex;
  justify-content: center;
  gap: 12px;
}

.share-btn {
  width: 45px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--white);
  transition: all 0.3s ease;
}

.share-btn:hover {
  transform: translateY(-3px) scale(1.1);
}

.share-btn.twitter {
  background: #000;
}
.share-btn.whatsapp {
  background: #25d366;
}
.share-btn.facebook {
  background: #1877f2;
}
.share-btn.copy {
  background: var(--gray);
}

/* Review Screen */
.review-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.review-header h2 {
  font-size: 1.3rem;
  color: var(--dark);
}

.review-list {
  max-height: 400px;
  overflow-y: auto;
  margin-bottom: 20px;
}

.review-item {
  padding: 15px;
  background: var(--gray-light);
  border-radius: var(--radius-sm);
  margin-bottom: 10px;
  border-left: 4px solid;
}

.review-item.correct {
  border-color: var(--success);
}

.review-item.wrong {
  border-color: var(--danger);
}

.review-item.skipped {
  border-color: var(--warning);
}

.review-question {
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 8px;
}

.review-answer {
  font-size: 0.85rem;
  color: var(--gray);
}

.review-answer span {
  font-weight: 600;
}

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

.review-answer .your-answer {
  color: var(--danger);
}

/* Back Link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.1);
  color: var(--white);
  text-decoration: none;
  border-radius: var(--radius-full);
  font-weight: 600;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.back-link:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateX(-5px);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--dark);
  color: var(--white);
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  z-index: 1001;
  display: flex;
  align-items: center;
  gap: 10px;
  animation: toastIn 0.3s ease;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

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

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translate(-50%, 20px);
  }
  to {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

/* Responsive Design */
@media (max-width: 576px) {
  .screen {
    padding: 20px;
  }

  h1 {
    font-size: 2rem;
  }

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

  .difficulty-options {
    grid-template-columns: 1fr;
  }

  .count-options,
  .timer-options {
    flex-wrap: wrap;
  }

  .count-btn,
  .timer-btn {
    flex: 1 1 45%;
  }

  .stats-preview {
    gap: 15px;
  }

  .question-text {
    font-size: 1.05rem;
  }

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

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

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