main {
  max-width: 900px;
  margin: 30px auto;
  padding: 20px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h2 {
  text-align: center;
  margin-bottom: 15px;
}

.intro-text {
  text-align: center;
  margin-bottom: 25px;
  font-size: 1.1rem;
  color: #555;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

th, td {
  padding: 12px;
  border-bottom: 1px solid #ddd;
  text-align: center;
}

th {
  background: #f4f4f4;
  font-weight: bold;
}

tr:hover {
  background: #f9f9f9;
}

button {
  padding: 8px 14px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: #007bff;
  color: white;
  font-weight: 600;
  transition: background 0.2s;
}

button:hover {
  background: #0056b3;
}