:root {
  --primary-color: #0077b6;
  --secondary-color: #023e8a;
  --text-color: #333333;
  --background-color: #f8f9fa;
  --card-background: #ffffff;
}

body {
  font-family: 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
}

.container {
  max-width: 800px;
  width: 90%;
  margin: 2rem auto;
  padding: 2rem;
  background-color: var(--card-background);
  border-radius: 12px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

h1 {
  color: var(--primary-color);
  font-weight: 500;
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.button-container, .menu {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.button {
  padding: 0.8rem 1.2rem;
  border: none;
  border-radius: 6px;
  background-color: var(--primary-color);
  color: white;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.2s;
}

.button:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
}

ul {
  list-style: none;
  padding: 0;
}

ul li {
  margin: 0.8rem 0;
}

ul li a {
  color: var(--primary-color);
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 500;
  transition: color 0.3s;
}

ul li a:hover {
  color: var(--secondary-color);
}

img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
  margin: 2rem auto;
  border: 4px solid var(--primary-color);
  display: block;
}

#lumpDescription, #lumpPresentation {
  background-color: #f1f8ff;
  border: 1px solid #d0e3ff;
  padding: 1.5rem;
  border-radius: 8px;
  margin-top: 1.5rem;
  font-size: 1rem;
}

#lumpPresentation {
  margin-top: 1rem;
}

.back-button {
  margin-top: 1.5rem;
  padding: 0.8rem 1.2rem;
  background-color: #dc3545;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
  transition: background-color 0.3s;
}

.back-button:hover {
  background-color: #c82333;
}

@media (max-width: 600px) {
  .container {
    width: 95%;
    padding: 1.5rem;
  }

  h1 {
    font-size: 2rem;
  }

  .button-container, .menu {
    grid-template-columns: 1fr;
  }

  img {
    width: 150px;
    height: 150px;
  }
}