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

html {
  font-family: 'Inter', sans-serif;
}

body {
  background: linear-gradient(180deg, #87CEEB 0%, #E0F6FF 100%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.5s ease;
}

body.success-bg {
  background: linear-gradient(180deg, #90EE90 0%, #98FF98 100%);
}

body.failed-bg {
  background: linear-gradient(180deg, #FFB6C6 0%, #FFC0CB 100%);
}

.header {
  text-align: center;
  padding: 30px 20px;
  color: white;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.header h1 {
  font-size: 2.8rem;
  margin-bottom: 10px;
  font-weight: 800;
  color: #fff;
  letter-spacing: 1px;
}

.level-info {
  font-size: 1.3rem;
  opacity: 0.95;
  font-weight: 600;
  color: #fff;
}

.game-container {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.questions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  max-width: 1200px;
  width: 100%;
}

.question-card {
  background: white;
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 3px solid rgba(102, 126, 234, 0.1);
}

.question-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}

.image-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 150px;
  margin-bottom: 20px;
  font-size: 5rem;
}

.emoji {
  display: block;
}

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

.option-btn {
  padding: 14px 18px;
  font-size: 1.1rem;
  border: 3px solid #667eea;
  background: white;
  color: #333;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 600;
  text-align: center;
  box-shadow: 0 3px 8px rgba(0,0,0,0.1);
}

.option-btn:hover {
  background: #f0f0f0;
  border-color: #764ba2;
  transform: translateY(-2px);
  box-shadow: 0 5px 12px rgba(0,0,0,0.15);
}

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

.option-btn.correct {
  background: #38ef7d;
  color: white;
  border-color: #38ef7d;
  animation: correctPulse 0.6s ease;
}

.option-btn.incorrect {
  background: #f45c43;
  color: white;
  border-color: #f45c43;
  animation: incorrectShake 0.6s ease;
}

@keyframes correctPulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes incorrectShake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-10px);
  }
  75% {
    transform: translateX(10px);
  }
}

.footer-buttons {
  display: flex;
  justify-content: space-between;
  padding: 20px;
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.nav-btn {
  flex: 1;
  padding: 16px 20px;
  font-size: 1.1rem;
  font-weight: 700;
  border: none;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  text-align: center;
  color: white;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.back-btn {
  background: #FF6B6B;
  border: none;
}

.back-btn:hover {
  background: #FF5252;
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.2);
}

.next-btn {
  background: #4ECDC4;
  border: none;
}

.next-btn:hover {
  background: #45B5AD;
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.2);
}

/* Responsive */
@media (max-width: 768px) {
  .questions-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .header h1 {
    font-size: 2rem;
  }

  .image-container {
    font-size: 4rem;
    min-height: 120px;
  }

  .footer-buttons {
    flex-direction: column;
  }

  .nav-btn {
    padding: 12px 15px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 20px 15px;
  }

  .header h1 {
    font-size: 1.5rem;
  }

  .question-card {
    padding: 18px;
  }

  .image-container {
    font-size: 3rem;
    min-height: 100px;
  }

  .option-btn {
    font-size: 1rem;
    padding: 10px 12px;
  }
}