* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.container {
  max-width: 1000px;
  width: 100%;
  background-color: white;
  border-radius: 20px;
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
  overflow: hidden;
}

header {
  background: linear-gradient(to right, #4a00e0, #8e2de2);
  color: white;
  padding: 25px 30px;
  text-align: center;
}

header h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
}

header .subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 15px;
}

.mode-indicator {
  background-color: rgba(255, 255, 255, 0.15);
  border-radius: 10px;
  padding: 12px 20px;
  margin-top: 15px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.mode-tag {
  background-color: #ff9800;
  color: white;
  padding: 5px 15px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.mode-info {
  font-size: 0.9rem;
  opacity: 0.9;
}

.quiz-container {
  padding: 30px;
}

.start-screen,
.quiz-screen,
.result-screen,
.review-screen {
  transition: all 0.5s ease;
}

.hidden {
  display: none !important;
}

.start-content {
  text-align: center;
  padding: 20px 0;
}

.start-content h2 {
  color: #333;
  margin-bottom: 25px;
  font-size: 1.8rem;
}

.start-content ul {
  text-align: left;
  max-width: 700px;
  margin: 0 auto 30px;
  background-color: #f8f9fa;
  padding: 25px;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.start-content li {
  margin-bottom: 15px;
  font-size: 1.1rem;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.start-content li i {
  color: #4a00e0;
  margin-top: 3px;
}

.btn {
  background: linear-gradient(to right, #4a00e0, #8e2de2);
  color: white;
  border: none;
  padding: 15px 30px;
  border-radius: 50px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  box-shadow: 0 5px 15px rgba(74, 0, 224, 0.3);
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(74, 0, 224, 0.4);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  background: #cccccc;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.check-btn {
  background: linear-gradient(to right, #ff9800, #ff5722);
}

.check-btn:hover {
  box-shadow: 0 8px 20px rgba(255, 87, 34, 0.4);
}

.start-btn {
  padding: 18px 45px;
  font-size: 1.2rem;
}

.progress-container {
  margin-bottom: 30px;
}

.progress-bar {
  height: 10px;
  background-color: #e0e0e0;
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 10px;
  position: relative;
}

.progress-bar::after {
  content: "";
  display: block;
  height: 100%;
  width: var(--width, 0%);
  background: linear-gradient(to right, #4a00e0, #8e2de2);
  transition: width 0.5s ease;
  position: absolute;
  top: 0;
  left: 0;
}

.progress-text {
  text-align: right;
  font-size: 1rem;
  color: #666;
}

.question-container {
  margin-bottom: 30px;
}

.question-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 15px;
}

.question-header h2 {
  color: #333;
  font-size: 1.5rem;
  line-height: 1.5;
  flex: 1;
  min-width: 300px;
}

.selection-info {
  background-color: #f0f4ff;
  padding: 10px 20px;
  border-radius: 25px;
  font-size: 1rem;
  color: #4a00e0;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 2px solid #e0e0e0;
}

.selection-info i {
  font-size: 1.2rem;
}

/* Блок обратной связи */
.feedback-container {
  margin-bottom: 20px;
  animation: fadeIn 0.5s ease;
}

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

.feedback {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  font-size: 1.1rem;
  padding: 20px;
  border-radius: 12px;
  border-left: 5px solid;
}

.feedback i {
  font-size: 1.8rem;
  margin-top: 2px;
}

.feedback-content {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.feedback-title {
  font-weight: 700;
  font-size: 1.2rem;
}

.feedback-detail {
  opacity: 0.9;
  font-size: 1rem;
}

.correct-feedback {
  background-color: #e7f7ef;
  color: #2e7d32;
  border-left-color: #2e7d32;
}

.partially-feedback {
  background-color: #fff8e1;
  color: #f57c00;
  border-left-color: #ff9800;
}

.incorrect-feedback {
  background-color: #fdeaea;
  color: #c62828;
  border-left-color: #c62828;
}

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

.option {
  background-color: #f8f9fa;
  border: 2px solid #e0e0e0;
  border-radius: 12px;
  padding: 18px 20px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 15px;
  font-size: 1.1rem;
}

.option:hover {
  background-color: #eef2ff;
  border-color: #8e2de2;
}

.option.selected {
  background-color: #e6f7ff;
  border-color: #4a00e0;
  box-shadow: 0 3px 8px rgba(74, 0, 224, 0.1);
}

.option.correct {
  background-color: #e7f7ef;
  border-color: #2e7d32;
  color: #2e7d32;
}

.option.partial {
  background-color: #fff8e1;
  border-color: #ff9800;
  color: #f57c00;
}

.option.incorrect {
  background-color: #fdeaea;
  border-color: #c62828;
  color: #c62828;
}

.option.checked {
  cursor: default;
}

.option.checked:hover {
  background-color: inherit;
  border-color: inherit;
}

.option-checkbox {
  width: 24px;
  height: 24px;
  border: 2px solid #4a00e0;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.option.selected .option-checkbox {
  background-color: #4a00e0;
  color: white;
}

.option.selected .option-checkbox::after {
  content: "✓";
  font-weight: bold;
}

.option.correct .option-checkbox {
  background-color: #2e7d32;
  border-color: #2e7d32;
}

.option.partial .option-checkbox {
  background-color: #ff9800;
  border-color: #ff9800;
}

.option.incorrect .option-checkbox {
  background-color: #c62828;
  border-color: #c62828;
}

.option-text {
  flex: 1;
}

.question-hint {
  background-color: #f0f4ff;
  padding: 12px 20px;
  border-radius: 10px;
  color: #4a00e0;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
  border-left: 4px solid #4a00e0;
}

.navigation {
  display: flex;
  justify-content: space-between;
  margin-top: 30px;
  flex-wrap: wrap;
  gap: 15px;
}

.prev-btn,
.check-btn,
.next-btn,
.submit-btn {
  min-width: 180px;
}

.result-content {
  text-align: center;
  padding: 20px 0;
}

.result-content h2 {
  color: #333;
  margin-bottom: 25px;
  font-size: 1.8rem;
}

.score-circle {
  margin: 30px auto;
  max-width: 300px;
}

.circle {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: conic-gradient(#4a00e0 0%, #e0e0e0 0%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 15px;
  position: relative;
}

.circle::before {
  content: "";
  position: absolute;
  width: 170px;
  height: 170px;
  background-color: white;
  border-radius: 50%;
}

.circle span {
  font-size: 3.5rem;
  font-weight: 700;
  color: #333;
  z-index: 1;
}

.score-label {
  font-size: 1rem;
  color: #666;
  z-index: 1;
  margin-top: 5px;
}

.percentage {
  font-size: 1.8rem;
  font-weight: 700;
  color: #4a00e0;
}

.result-details {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  margin: 30px 0;
}

.result-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 25px;
  border-radius: 12px;
  font-size: 1.2rem;
  min-width: 250px;
}

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

.correct {
  background-color: #e7f7ef;
  color: #2e7d32;
}

.partially {
  background-color: #fff8e1;
  color: #f57c00;
}

.incorrect {
  background-color: #fdeaea;
  color: #c62828;
}

.result-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 30px;
}

.restart-btn,
.review-btn {
  min-width: 220px;
}

.review-header {
  text-align: center;
  margin-bottom: 30px;
}

.review-header h2 {
  color: #333;
  margin-bottom: 15px;
}

.review-header p {
  color: #666;
  font-size: 1.1rem;
  line-height: 1.6;
}

.correct-badge,
.partial-badge,
.incorrect-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: 15px;
  font-size: 0.9rem;
  margin: 0 5px;
}

.correct-badge {
  background-color: #e7f7ef;
  color: #2e7d32;
}

.partial-badge {
  background-color: #fff8e1;
  color: #f57c00;
}

.incorrect-badge {
  background-color: #fdeaea;
  color: #c62828;
}

.review-item {
  background-color: #f8f9fa;
  border-radius: 15px;
  padding: 25px;
  margin-bottom: 20px;
  box-shadow: 0 5px 10px rgba(0, 0, 0, 0.05);
}

.review-question {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: #333;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.question-status {
  font-size: 1rem;
  padding: 5px 15px;
  border-radius: 15px;
  font-weight: 600;
}

.status-correct {
  background-color: #e7f7ef;
  color: #2e7d32;
}

.status-partial {
  background-color: #fff8e1;
  color: #f57c00;
}

.status-incorrect {
  background-color: #fdeaea;
  color: #c62828;
}

.review-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.review-option {
  padding: 12px 15px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-left: 4px solid transparent;
}

.correct-answer {
  background-color: #e7f7ef;
  border-left-color: #2e7d32;
}

.user-correct {
  background-color: #e7f7ef;
  border-left-color: #2e7d32;
}

.user-partial {
  background-color: #fff8e1;
  border-left-color: #ff9800;
}

.user-incorrect {
  background-color: #fdeaea;
  border-left-color: #c62828;
}

.review-actions {
  display: flex;
  justify-content: center;
  margin-top: 30px;
}

footer {
  background-color: #f8f9fa;
  padding: 20px;
  text-align: center;
  color: #666;
  font-size: 0.9rem;
  border-top: 1px solid #e0e0e0;
}

@media (max-width: 768px) {
  .container {
    border-radius: 15px;
  }

  header h1 {
    font-size: 1.8rem;
  }

  .quiz-container {
    padding: 20px;
  }

  .question-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .question-header h2 {
    min-width: auto;
  }

  .navigation {
    flex-direction: column;
    align-items: stretch;
  }

  .prev-btn,
  .check-btn,
  .next-btn,
  .submit-btn {
    width: 100%;
    min-width: auto;
  }

  .result-details {
    flex-direction: column;
    align-items: center;
  }

  .result-item {
    width: 100%;
    max-width: 300px;
    min-width: auto;
  }

  .result-actions {
    flex-direction: column;
    align-items: center;
  }

  .restart-btn,
  .review-btn {
    width: 100%;
    max-width: 300px;
    min-width: auto;
  }
}