body {
  background: linear-gradient(135deg, #0f0f0f 0%, #1a1a1a 100%);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-content: flex-start;
  align-items: flex-start;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  box-sizing: border-box;
  gap: 15px;
}

.section {
  font-weight: 600;
  font-size: 32px;
  text-align: center;
  width: 100%;
  color: #e8e8e8;
  margin: 20px 0 10px 0;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  letter-spacing: 0.5px;
}

.subsection {
  text-align: center;
  font-weight: 700;
  font-size: 20px;
  color: #667eea;
}

.card {
  min-width: 320px;
  max-width: 480px;
  background-color: #2d2d2d;
  color: #e8e8e8;
  padding: 16px;
  border: 1px solid #3a3a3a;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 16px 40px rgba(102, 126, 234, 0.15);
  border-color: #667eea;
}

.notes {
  padding: 0 0 0 20px;
  color: #d8d8d8;
  list-style: disc;
  margin: 0px;
  line-height: 1.6;
}

.notes li {
  padding: 4px 0;
}

hr {
  margin: 0px;
  border: none;
  border-top: 1px solid #3a3a3a;
}

#back-button {
  position: fixed;
  top: 15px;
  left: 15px;
  background-color: #6e6e6e;
  color: rgb(221, 221, 221);
  border: none;
  padding: 10px;
  border-radius: 8px;
  font-size: 20px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: background-color 0.3s ease, transform 0.3s ease;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 1000;
}

#back-button:hover {
  background-color: #5568d3;
  transform: scale(1.05);
}