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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
  overflow-x: hidden;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  background: white;
  border-radius: 20px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
  overflow: hidden;
  animation: slideIn 0.8s ease-out;
}

@keyframes slideIn {
  from { 
    opacity: 0; 
    transform: translateY(50px) scale(0.95); 
  }
  to { 
    opacity: 1; 
    transform: translateY(0) scale(1); 
  }
}

.header {
  background: linear-gradient(135deg, #FF6B6B, #4ECDC4);
  color: white;
  padding: 40px 30px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 20%, transparent 70%);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

.header h1 {
  font-size: 2.8rem;
  margin-bottom: 15px;
  text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
  position: relative;
  z-index: 2;
}

.header p {
  font-size: 1.2rem;
  opacity: 0.95;
  position: relative;
  z-index: 2;
}

.content {
  padding: 50px 40px;
}

.progress-container {
  margin-bottom: 40px;
  background: #f8f9fa;
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.question-counter {
  font-size: 1.1rem;
  font-weight: 600;
  color: #2c3e50;
}

.category-badge {
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: white;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 600;
}

.progress-bar {
  width: 100%;
  height: 12px;
  background-color: #e9ecef;
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #FF6B6B, #4ECDC4);
  border-radius: 6px;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.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: shimmer 2s infinite;
}

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

.question-container {
  background: linear-gradient(135deg, #f8f9fa, #ffffff);
  border-radius: 15px;
  padding: 35px;
  margin-bottom: 30px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  border: 1px solid #e9ecef;
  animation: questionSlide 0.6s ease-out;
}

@keyframes questionSlide {
  from { 
    opacity: 0; 
    transform: translateX(30px); 
  }
  to { 
    opacity: 1; 
    transform: translateX(0); 
  }
}

.question-text {
  font-size: 1.3rem;
  line-height: 1.6;
  color: #2c3e50;
  margin-bottom: 30px;
  font-weight: 500;
}

.options-container {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.option {
  position: relative;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.option input[type="radio"] {
  display: none;
}

.option-label {
  display: block;
  padding: 20px 25px;
  background: white;
  border: 2px solid #e9ecef;
  border-radius: 12px;
  font-size: 1.1rem;
  line-height: 1.4;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.option-label::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(52, 152, 219, 0.1), transparent);
  transition: left 0.5s ease;
}

.option:hover .option-label {
  border-color: #3498db;
  box-shadow: 0 8px 25px rgba(52, 152, 219, 0.15);
  transform: translateY(-2px);
}

.option:hover .option-label::before {
  left: 100%;
}

.option input[type="radio"]:checked + .option-label {
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: white;
  border-color: #2980b9;
  box-shadow: 0 10px 30px rgba(52, 152, 219, 0.3);
  transform: translateY(-3px);
}

.submit-container {
  text-align: center;
  margin-top: 40px;
}

.submit-btn {
  background: linear-gradient(135deg, #27ae60, #2ecc71);
  color: white;
  border: none;
  padding: 18px 40px;
  font-size: 1.2rem;
  font-weight: 600;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 10px 30px rgba(46, 204, 113, 0.3);
  position: relative;
  overflow: hidden;
}

.submit-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;
}

.submit-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(46, 204, 113, 0.4);
}

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

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

.results-container {
  text-align: center;
  padding: 40px;
  animation: resultsAppear 0.8s ease-out;
}

@keyframes resultsAppear {
  from { 
    opacity: 0; 
    transform: scale(0.9); 
  }
  to { 
    opacity: 1; 
    transform: scale(1); 
  }
}

.score-display {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #FF6B6B, #4ECDC4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.thermometer-container {
  background: #f8f9fa;
  border-radius: 15px;
  padding: 25px;
  margin: 30px 0;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.thermometer {
  width: 100%;
  height: 30px;
  background-color: #e9ecef;
  border-radius: 15px;
  overflow: hidden;
  position: relative;
  margin-bottom: 15px;
}

.thermometer-fill {
  height: 100%;
  border-radius: 15px;
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.1rem;
}

.performance-text {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 15px;
}

.failed-questions {
  text-align: left;
  margin-top: 40px;
}

.failed-questions h3 {
  color: #e74c3c;
  border-bottom: 3px solid #e74c3c;
  padding-bottom: 10px;
  margin-bottom: 25px;
  font-size: 1.6rem;
}

.category-section {
  margin-bottom: 30px;
  background: white;
  border-radius: 12px;
  padding: 25px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.08);
  border-left: 4px solid #e74c3c;
}

.category-title {
  color: #2c3e50;
  font-size: 1.3rem;
  margin-bottom: 20px;
  font-weight: 600;
}

.failed-question {
  background: #fff5f5;
  border: 1px solid #fed7d7;
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}

.failed-question p {
  margin-bottom: 10px;
  line-height: 1.5;
}

.failed-question strong {
  color: #2c3e50;
}

.user-answer {
  color: #e74c3c;
  font-weight: 600;
}

.correct-answer {
  color: #27ae60;
  font-weight: 600;
}

.explanation {
  background: #f8f9fa;
  border-left: 4px solid #3498db;
  padding: 15px;
  margin-top: 15px;
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: #2c3e50;
}

.congratulations {
  background: linear-gradient(135deg, #27ae60, #2ecc71);
  color: white;
  padding: 30px;
  border-radius: 15px;
  margin-top: 30px;
  text-align: center;
}

.congratulations h3 {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.congratulations p {
  font-size: 1.2rem;
  opacity: 0.9;
}

.hidden {
  display: none;
}

@media (max-width: 768px) {
  .container {
    margin: 10px;
    border-radius: 15px;
  }
  
  .content {
    padding: 30px 20px;
  }
  
  .header h1 {
    font-size: 2.2rem;
  }
  
  .question-text {
    font-size: 1.1rem;
  }
  
  .option-label {
    padding: 15px 20px;
    font-size: 1rem;
  }
  
  .score-display {
    font-size: 2.5rem;
  }
}