#start-test-btn {
  background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
  color: white;
  border: none;
  padding: 1rem 2.5rem;
  font-size: 1.2rem;
  font-weight: 600;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
  letter-spacing: 0.5px;
}

#start-test-btn:hover {
  transform: translateY(-3px);
  background: linear-gradient(135deg, #c0392b 0%, #e74c3c 100%);
  box-shadow: 0 8px 25px rgba(231, 76, 60, 0.4);
}

#start-test-btn:active {
  transform: translateY(0px);
  box-shadow: 0 2px 10px rgba(231, 76, 60, 0.3);
}

/* ===== QUESTION & OPTIONS STYLES ===== */
.question {
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.question h3 {
  color: #2c3e50;
  margin-bottom: 0.75rem;
  font-size: 1rem;
  font-weight: 500;
}

.question p {
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  color: #34495e;
  line-height: 1.4;
}

.mbti-options {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.mbti-option {
  flex: 1;
  min-width: 200px;
  background: #f8f9fa;
  border: 2px solid #e0e0e0;
  border-radius: 12px;
  padding: 1.2rem 1rem;
  cursor: pointer;
  transition: all 0.25s ease;
  text-align: center;
}

.mbti-option:hover {
  background: #f0f0f0;
  border-color: #e74c3c;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.mbti-option.selected {
  background: linear-gradient(135deg, #e74c3c15 0%, #c0392b10 100%);
  border-color: #e74c3c;
  border-width: 2px;
  box-shadow: 0 2px 8px rgba(231, 76, 60, 0.2);
}

.option-label {
  font-size: 1rem;
  color: #2c3e50;
  font-weight: 500;
  line-height: 1.4;
}

.mbti-option.selected .option-label {
  color: #c0392b;
  font-weight: 600;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .gender-selection h3 {
    font-size: 1.2rem;
  }
  
  #start-test-btn {
    padding: 0.8rem 1.8rem;
    font-size: 1rem;
  }
  
  .question {
    padding: 1rem;
  }
  
  .question p {
    font-size: 1rem;
  }
  
  .mbti-options {
    flex-direction: column;
    gap: 0.8rem;
  }
  
  .mbti-option {
    min-width: auto;
    padding: 0.9rem 0.8rem;
  }
  
  .option-label {
    font-size: 0.9rem;
  }
}

@media (max-width: 480px) {
  #start-test-btn {
    padding: 0.7rem 1.5rem;
    font-size: 0.95rem;
    width: 100%;
    max-width: 280px;
  }
  
  .question p {
    font-size: 0.95rem;
  }
  
  .mbti-option {
    padding: 0.8rem 0.6rem;
  }
  
  .option-label {
    font-size: 0.85rem;
  }
}

/* ===== ANIMATION FOR OPTION SELECTION ===== */
.mbti-option {
  position: relative;
  overflow: hidden;
}

.mbti-option::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(231, 76, 60, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.4s, height 0.4s;
}

.mbti-option:active::before {
  width: 200px;
  height: 200px;
}

/* ===== PROGRESS BAR ENHANCEMENT ===== */
.progress-container {
  margin-bottom: 1.5rem;
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar {
  transition: width 0.3s ease;
  background: linear-gradient(90deg, #e74c3c, #f39c12);
}

/* =按钮容器样式 */
#next-btn, #submit-btn {
  background: #2c3e50;
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-top: 1rem;
}

#next-btn:hover, #submit-btn:hover {
  background: #34495e;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}