body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #e0f7fa, #f0f8ff);
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.progress-container {
  width: 90%;
  max-width: 600px;
  background-color: #ffffffee;
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
  padding: 30px;
  position: relative;
}

.back-button {
  position: absolute;
  top: 16px;
  right: 16px;
  background: linear-gradient(135deg, #007BFF, #00BFFF);
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
}

.back-button:hover {
  background: linear-gradient(135deg, #0056b3, #0099cc);
  transform: scale(1.05);
}

.title {
  text-align: center;
  font-size: 1.8rem;
  color: #0072ff;
  margin-bottom: 20px;
}

.phase-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 20px;
}

.phase {
  padding: 10px 18px;
  border-radius: 30px;
  font-weight: bold;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all 0.3s ease;
}

.phase.active {
  background: linear-gradient(135deg, #00c6ff, #0072ff);
  color: #fff;
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.phase.disabled {
  background-color: #cccccc;
  color: #666;
  cursor: not-allowed;
}

.report-section {
  background-color: #f9f9f9;
  border-radius: 12px;
  padding: 16px;
  box-shadow: inset 0 0 10px rgba(0,0,0,0.05);
  font-size: 0.95rem;
  color: #333;
}

.report-section ul {
  padding-left: 20px;
  margin-top: 10px;
}

.report-section li {
  margin-bottom: 6px;
}