body {
  font-family: "Roboto", sans-serif;
  color: #2c3e50;
  background-color: #ecf0f1;
  margin: 0;
  padding: 0;
}

h1,
h2,
h3 {
  color: #444;
  margin-bottom: 1rem;
}

.container {
  max-width: 900px;
  margin: 20px auto;
  padding: 30px;
  background-color: #ffffff;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
}

h2 {
  color: #34495e;
  margin-bottom: 15px;
  font-weight: 600;
}

section {
  margin-bottom: 40px;
}

.controls {
  margin-bottom: 15px;
}

select,
input[type="text"],
button {
  padding: 10px;
  margin-right: 12px;
  border: 1px solid #bdc3c7;
  border-radius: 4px;
  font-size: 16px;
}

button {
  background-color: #3498db;
  color: #fff;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s ease;
}

button:hover {
  background-color: #2980b9;
  transform: translateY(-2px);
}

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

th,
td {
  border: 1px solid #ddd;
  padding: 10px;
  text-align: left;
}

th {
  background-color: #f7f9fa;
  color: #2c3e50;
}

details summary {
  cursor: pointer;
  font-weight: bold;
  margin-bottom: 10px;
}

details[open] summary {
  color: #3498db;
}

header {
  background-color: #f7f9fa;
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid #ddd;
}

header h1 {
  margin: 0;
  color: #2c3e50;
}

header p {
  margin: 10px 0 0;
  color: #34495e;
}