body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f5f5f5;
}

.header {
  background-color: #071e22;
  color: white;
  padding: 20px;
  text-align: center;
}

.container {
  max-width: 1200px;
  margin: 20px auto;
  padding: 20px;
}

.button-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  justify-content: center;
}

.system-button {
  background-color: white;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 20px;
  width: 300px;
  text-align: center;
  text-decoration: none;
  color: #333;
  min-height: 150px;
  aspect-ratio: 1/0.5;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.system-button:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  background-color: #e3f2fd;
}

h1, h2, h3 {
  text-align: center;
  color: #33798f;
}

h1 {
  margin: 0;
  font-size: 2.5em;
}

.description {
  margin: 10px 0 30px;
  color: #666;
}